General Packet Radio Service (Download Full Seminar Report)
Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
Computer Science Clay
Active In SP
**

Posts: 712
Joined: Jan 2009
#1
30-07-2009, 05:03 PM


Todayâ„¢s mobile professionals need to stay in regular contact with important sources of information such as the Internet, email, corporate networks and remote databases. As demand for Wide Area Networking (WAN) connectivity continues to grow, users and organizations are seeking ways to make it more efficient and productive. One of the most promising new technologies for this purpose is General Packet Radio Service (GPRS). GPRS is a packet-switching data network that is overlaid on the existing cellular voice network, using the same radio frequencies and cellular towers. When combined with the existing Global System for Mobile communication (GSM), GPRS offers a complete voice and data solution with significant advantages over other solutions.

GPRS offers the flexibility and throughput of packet switching. GPRS uses packet switching to transfer data from the mobile device to the network and back. On a packet switched network a device can be always connected and ready to send information without monopolizing the channel. Channels are shared in packet-switched network, but in circuit-switched each channel is dedicated to one user. There are no call up or suspend delays.

seminar and presentationproject and implimentationsdownloads/?file=/computer%20science%20and%20electronics/General%20Packet%20Radio%20Service.pdf&name=General%20Packet%20Radio%20Service.pdf
Use Search at http://topicideas.net/search.php wisely To Get Information About Project Topic and Seminar ideas with report/source code along pdf and ppt presenaion
Reply
project topics
Active In SP
**

Posts: 2,492
Joined: Mar 2010
#2
06-04-2010, 05:08 PM


.ppt   GPRS.ppt (Size: 718.5 KB / Downloads: 557)

.docx   General Packet Radio Service.docx (Size: 216.91 KB / Downloads: 331)


ABSTRACT
Today's mobile professionals need to stay in regular contact with important sources of information such as the Internet, email, corporate networks and remote databases. As demand for Wide Area Networking (WAN) connectivity continues to grow, users and organizations are seeking ways to make it more efficient and productive. One of the most promising new technologies for this purpose is General Packet Radio Service (GPRS). GPRS is a packet-switching data network that is overlaid on the existing cellular voice network, using the same radio frequencies and cellular towers. When combined with the existing Global System for Mobile communication (GSM), GPRS offers a complete voice and data solution with significant advantages over other solutions.
GPRS offers the flexibility and throughput of packet switching. GPRS uses packet switching to transfer data from the mobile device to the network and back. On a packet switched network a device can be always connected and ready to send information without monopolizing the channel. Channels are shared in packet-switched network, but in circuit-switched each channel is dedicated to one user. There are no call up or suspend delays.
By overlaying the GSM network, GPRS is able to take advantage of the world's leading digital phone system with a global subscriber base of over 646.5 million.Theoretical maximum speeds of up to 171.2 kilobits per second (kbps) are achievable with GPRS. This is about three times as fast as the data transmission speeds possible over today's fixed telecommunications networks and ten times as fast as current Circuit Switched Data services on GSM networks.
INTRODUCTION
Wireless wide area cellular network solutions have been around for many years. Widespread adoption has been slow due to issues with coverage, cost, performance, and secure remote access to business networks. The deployment of the Global System for Mobile Communications (GSM) based General Packet Radio Service (GPRS) has the potential to change this situation and to provide connectivity any time and any where. GPRS is a packet based radio service that enables always on connections, eliminating repetitive and time consuming dial up connections. It will also provide real throughput in excess of 40 Kbps, about the same speed as an excellent land line analog modem connection.
Need For a Wireless WAN Solution
Mobile workers who need to access information while they travel can do so using one of two Wide Area Networking methods - wired or wireless. In the past, they relied mainly on wired methods such as analog modems to connect over the public switched telephone network (PSTN). However, users realized that using a dial up method to get a connection were relatively tedious and time consuming, and connections were sometimes difficult to maintain. In addition, as networking has progressed, the circuit- switched phone network has proved to have limitations for data transmission compared to packet-switched networks such as the Internet and corporate LANs. And finally, wired methods do not provide the same degree of mobility as wireless solutions. The advent of wireless data communication through the use of mobile phones and alphanumeric pagers have provided a higher degree of flexibility over wired mobile connections. Today, users are able to connect their notebook and handheld computers to data sources using mobile phone connection kits, and the data is sent over the mobile phone network. However, mobile phones are still relatively slow in terms of data throughput, and pagers can only display small amounts of information. Manufacturers are rapidly developing a wide variety of new client devices, and advanced transmission capabilities are also required. Mobile data users, businesses and other organizations have asked for the freedom of wireless, but with the performance of wired connections. One of the most promising technologies for meeting these needs is General Packet Radio Service (GPRS). This wireless data transmission technology can be used to send data over large geographic areas to create the next evolution of wireless WANs (WWANs).
Advantages of GPRS
GPRS provides faster data transfer rates, always on connection, robust connectivity, broad application support and strong security mechanisms.
Fast Data Transfer Rates
GPRS currently supports an average data rate of 115 Kbps, but this speed is only achieved by dedicating all eight time slots to GPRS. Instead, carriers and terminal devices will typically be configured to handle a specific number of time slots for upstream and downstream data. For example, a GPRS device might be set to handle a maximum of four slots downstream and two slots upstream. Under good radio conditions, this yields speeds of approximately 50 Kbps downstream and 20 Kbps upstream. This is more than three times faster than current 14.4-Kbps GSM networks and roughly equivalent to a good land line analog modem connection. The aggregate cell site bandwidth is shared by voice and data traffic. GPRS operators will vary in how they allocate the bandwidth. Typically, they will configure the networks to give precedence to voice traffic; some may dedicate time slots to data traffic to ensure a minimum level of service during busy voice traffic periods. Unused voice capacity may be dynamically reallocated to data traffic. With its faster data transfer rates, GPRS enables higher bandwidth applications not currently feasible on a GSM network.
Always-On Connection
An always on connection eliminates the lengthy delays required to reconnect to the network to send and receive data. Information can also be pushed to the end user in real time. GPRS allows providers to bill by the packet, rather than by the minute, thus enabling cost effective always on subscriber services.
Robust Connectivity
GPRS improves data transmission integrity with a number of mechanisms. First, user data is encoded with redundancies that improve its resistance to adverse radio conditions. The amount of coding redundancy can be varied, depending on radio conditions. GPRS has defined four coding schemes CS1 through CS4. Initially, only CS1 and CS2 will be supported, which allows approximately 9 and 13 Kbps in each time slot. If an error is detected in a frame received in the base station, the frame may be repeatedly retransmitted until properly received before passing it on to the GPRS core network.
Broad Application Support
Like the Internet, GPRS is based on packet-switched data. This means that all native IP applications, such as email, Web access, instant messaging, and file transfers can run over GPRS. In addition, its faster data transfer rates enable GPRS to accommodate higher-bandwidth applications (such as multimedia Web content) not suited to slower GSM dial-up connections. GPRS is particularly well suited for applications based on the Wireless Application Protocol (WAP). WAP has gained widespread acceptance in a new breed of micro browser enabled phones.
Security Support
GPRS builds on the proved authentication and security model used by GSM. At session initiation, a user is authenticated using secret information contained on a smart card called a Subscriber Identity Module (SIM). Authentication data is exchanged and validated with records stored in the HLR network node. GPRS enables additional authentication using protocols such as RADIUS before the subscriber is allowed access to the Internet or corporate data networks. GPRS supports the ciphering of user data across the wireless interface from the mobile terminal to the SGSN. In addition, higher level, end to end VPN encryption may take place when a user connects to a private corporate network.
A BIT OF HISTORY
First Generation Wireless Technology
The first generation of wireless mobile communications was based on analog signaling. Analog systems, implemented in North America, were known as Analog Mobile Phone Systems (AMPS), while systems implemented in Europe and the rest of the world were typically identified as a variation of Total Access Communication Systems (TACS). Analog systems were primarily based on circuit-switched technology and designed for voice, not data.
Second Generation Wireless Technology
The second generation (2G) of the wireless mobile network was based on low band digital data signaling. The most popular 2G wireless technology is known as Global Systems for Mobile Communications (GSM). GSM technology is a combination of Frequency Division Multiple Access (FDMA) and Time Division Multiple Access (TDMA). The first GSM systems used a 25MHz frequency spectrum in the 900MHz band. FDMA is used to divide the available 25MHz of bandwidth into 124 carrier frequencies of 200kHz each. Each frequency is then divided using a TDMA scheme into eight time slots. The use of separate time slots for transmission and reception simplifies the electronics in the mobile units. Today, GSM systems operate in the 900MHz and 1.8 GHz bands throughout the world with the exception of the Americas where they operate in the 1.9 GHz band. While GSM technology was developed in Europe, Code Division Multiple Access (CDMA) technology was developed in North America. CDMA uses spread spectrum technology to break up speech into small, digitized segments and encodes them to identify each call. The Second Generation (2G) wireless networks mentioned above are also mostly based on circuit-switched technology. 2G wireless networks are digital and expand the range of applications to more advanced voice services, such as Called Line Identification. 2G wireless technology can handle some data capabilities such as fax and short message service at the data rate of up to 9.6 kbps, but it is not suitable for web browsing and multimedia applications.
Second Generation Plus (2G+) Wireless Networks
The effective data rate of 2G circuit-switched wireless systems is relatively slow for today's Internet. As a result, GSM and other TDMA-based mobile system providers and carriers have developed 2G+ technology that is packet- based and increases the data communication speeds to as high as 384kbps. These 2G+ systems are based on the following technologies High Speed Circuit-Switched Data (HSCSD), General Packet Radio Service (GPRS) and Enhanced Data Rates for Global Evolution (EDGE) technologies. HSCSD is one step towards 3G wide band mobile data networks. This circuit-switched technology improves the data rates up to 57.6kbps by introducing 14.4 kbps data coding and by aggregating 4 radio channels time slots of 14.4 kbps. GPRS is an intermediate step that is designed to allow the GSM world to implement a full range of Internet services without waiting for the deployment of full scale 3G wireless systems. GPRS uses a multiple of the 1 to 8 radio channel time slots in the 200kHz-frequency band allocated for a carrier frequency to enable data speeds of up to 115kbps. EDGE technology is a standard that has been specified to enhance the throughput per time slot for both HSCSD and GPRS.
KEY NETWORK FEATURES OF GPRS Packet switching
GPRS involves overlaying a packet based air interface on the existing circuit switched GSM network. This gives the user an option to use a packet-based data service. .With GPRS, the information is split into separate but related "packets" before being transmitted and reassembled at the receiving end. Packet switching is similar to a jigsaw puzzle- the image that the puzzle represents is divided into pieces at the manufacturing factory and put into a plastic bag. During transportation of the now boxed jigsaw from the factory to the end user, the pieces get jumbled up. When the recipient empties the bag with all the pieces, they are reassembled to form the original image. All the pieces are all related and fit together, but the way they are transported and assembled varies.
Spectrum efficiency
Packet switching means that GPRS radio resources are used only when users are actually sending or receiving data. Rather than dedicating a radio channel to a mobile data user for a fixed period of time, the available radio resource can be concurrently shared between several users. This efficient use of scarce radio resources means that large numbers of GPRS users can potentially share the same bandwidth and be served from a single cell. The actual number of users supported depends on the application being used and how much data is being transferred. Because of the spectrum efficiency of GPRS, there is less need to build in idle capacity that is only used in peak hours. GPRS therefore lets network operators maximize the use of their network resources in a dynamic and flexible way, along with user access to resources and revenues.
Internet aware
For the first time, GPRS fully enables Mobile Internet functionality by allowing interworking between the existing Internet and the new GPRS network. Any service that is used over the fixed Internet today- File Transfer Protocol (FTP), web browsing, chat, email, telnet- will be as available over the mobile network because of GPRS. In fact, many network operators are considering the opportunity to use GPRS to help become wireless Internet Service Providers in their own right.. There is a trend away from storing information locally in specific software packages on PCs to remotely on the Internet .Each GPRS terminal can potentially have its own IP address and will be addressable as such.
GPRS ARCHITECTURE
GSM Network Overview
At a high level, GSM is a mobile telephony network based on the cellular concept. Users can place and receive calls without being fixed to a specific location or wired to a physical connection. To supply this capability, a GSM network consists of three basic components:
Subscriber Terminal Devices
Today, these devices are typically cell phones, but there are other devices such as personal digital assistants (PDAs) with various input/output capabilities. All have integrated radio transceivers.
Types of devices : GPRS devices are also classified by their ability to handle voice and data calls. There are three such classifications:
¢ Class A devices provide complete support of simultaneous voice and GPRS.
¢ Class B devices can be registered on both the GSM (voice) and GPRS (data) networks, but only one connection can be active at a time. The user can select to put data delivery on hold while they receive phone calls and vice versa.
¢ Class C devices require that voice calls must be cleared before GPRS can be used and vice versa. Thus, the device will not automatically switch between voice and data, a hard switchover is required.
Radio Base Station Network
Cellular networks are composed of small, low powered, terrestrial radio cells that typically range in coverage area from tens of kilometers in sparsely populated rural areas to less than 500 meters in densely populated urban areas. The frequencies used by the network are reused again and again in different cells throughout the network to increase network capacity.
Network Switching and Services Infrastructure
The traffic to and from the radio network is concentrated at a set of switching nodes that interface to other fixed public or private networks. These nodes handle the call setup, channel resource allocation, and the administration of subscriber services. These components allow the GSM network to provide coverage as a user moves from an area covered by one cell to an area covered by another cell. The network terminates the old cell connection and immediately establishes a new cell connection. This process is designed to be transparent to the user. In addition, users can roam or travel outside of a home coverage area to a new city, region, or country. The arrival of the visitor is detected by the new system through an automatic registration process. The new system informs the user's home system of the new location so that calls can be delivered.
Many registers are also maintained which contain information necessary for the smooth functioning of the network. The HLR (Home Location Register) stores information about the current location of all subscribers of the network. This information is necessary for routing all calls/messages to their intended destinations. A VLR (Visitor Location Register) covers one or more cells and stores information about the subscribers currently under its area of influence.
Fig 1 : GPRS Network Architecture
Additional Network Functionality
Although GPRS reuses existing GSM network elements, some new protocols, interfaces and other network elements are required (see Figure 1 ). These include two major core network elements, the Serving GPRS Support Node (SGSN) and the Gateway GPRS Support Node (SGSN).
Serving GPRS Support Node (SGSN): The SGSN is responsible for tracking the state of the mobile station and its movements as it roams in a geographical area. It also handles the data connection between the mobile device and the network. SGSNs send queries to Home Location Registers (HLRs) to obtain profile data of GPRS subscribers. SGSNs detect new GPRS mobile stations in a given service area; and, finally, SGSNs process registration of new mobile subscribers and keep a record of their location inside a given service area.
Gateway GPRS Support Node (GGSN): The GGSN handles the link
between the GPRS network and other data networks, i.e. the Internet and enterprise networks. Each of those networks is given an Access Point Name
(APN).
GPRS IN ACTION
When a user turns on a GPRS device, typically it will automatically scan for a local GPRS channel. If an appropriate channel is detected, the
device will attempt to attach to the network. The SGSN receives the attach request, fetches subscriber profile information from the subscriber's HLR node, and authenticates the user. Ciphering may be established at this point. The SGSN uses the profile information (including the access point name, which identifies the network and operator) to determine which GGSN to route to. The selected gateway may perform a Remote Authentication Dial In User Service (RADIUS) authentication and allocate a dynamic Internet Protocol (IP) address to the user before setting up connections to outside networks. This process is called the packet data profile context activation and the setup may vary from one carrier to the next. It may include additional functions like QoS management. When the mobile device is powered off or moved out of a GPRS coverage area, its context is deactivated and the device is detached from the network.
How does a GPRS work?
Attachment and Detachment Procedure
Before a mobile station can use GPRS services, it must register with an SGSN of the GPRS network. The network checks if the user is authorized, copies the user profile from the HLR to the SGSN, and assigns a packet temporary mobile subscriber identity (PTMSI) to the user. This procedure is called GPRS attach. For mobile stations using both circuit switched and packet switched services it is possible to perform combined GPRS/IMSI attach procedures. The disconnection from the GPRS network is called GPRS detach. It can be initiated by the mobile station or by the network (SGSN or HLR).
Session Management
To exchange data packets with external PDNs after a successful GPRS attach, a mobile station must apply for one or more addresses used in the PDN, e.g., for an IP address in case the PDN is an IP network. This address is called PDP address (Packet Data Protocol address). For each session, a so called PDP context is created, which describes the characteristics of the session. It contains the PDP type (e.g., IPv4), the PDP address assigned to the mobile station (e.g., 129.187.222.10), the requested QoS, and the address of a GGSN that serves as the access point to the PDN. This context is stored in the MS,
the SGSN, and the GGSN.
With an active PDP context, the mobile station is "visible" for the external PDN and is able to send and receive data packets. The mapping between the two addresses, PDP and IMSI, enables the GGSN to transfer data packets between PDN and MS. A user may have several simultaneous PDP contexts active at a given time. The allocation of the PDP address can be static or dynamic. In the first case, the network operator of the user's home PLMN permanently assigns a PDP address to the user. In the second case, a PDP address is assigned to the user upon activation of a PDP context. The PDP address can be assigned by the operator of the user's home-PLMN (dynamic home- PLMN PDP address) or by the operator of the visited network (dynamic visited-PLMN PDP address). The GGSN is responsible for the allocation and the activation/ deactivation of the PDP addresses.
Figure shows the PDP context activation procedure. Using the message "activate PDP context request," the MS informs the SGSN about the requested PDP context. If dynamic PDP address assignment is requested, the parameter PDP address will be left empty. Afterward, usual security functions (e.g., authentication of the user) are performed. If access is granted, the SGSN will send a "create PDP context request" message to the affected GGSN. The latter creates a new entry in its PDP context table, which enables the GGSN to route data packets between the SGSN and the external PDN. Afterward, the GGSN returns a confirmation message "create PDP context response" to the SGSN, which contains the PDP address in case dynamic PDP address allocation was requested. The SGSN updates its PDP context table and confirms the activation of the new PDP context to the MS ("activate PDP context accept").
GPRS also supports anonymous PDP context activation. In this case, security functions as shown in Figure are skipped, and thus, the user (i.e., the IMSI) using the PDP context remains unknown to the network. Anonymous context activation may be employed for pre-paid services, where the user does not want to be identified. Only dynamic address allocation is possible in this case.
Data Packet Routing
The main functions of the GGSN involve interaction with the external data network. The GGSN updates the location directory using routing information supplied by the SGSNs about the location of a MS and routes the external data network protocol packet encapsulated over the GPRS backbone to the SGSN currently serving the MS. It also decapsulates and forwards external data network packets to the appropriate data network and collects charging data that is forwarded to a charging gateway.
In Figure 3 , three different routing schemes are illustrated: mobile-originated message (path 1), network-initiated message when the MS is in its home network (path 2), and network-initiated message when the MS has roamed to another GPRS operator's network (path 3). In these examples, the operator's GPRS network consists of multiple GSNs (with a gateway and serving functionality) and an intra-operator backbone network.
GPRS operators will allow roaming through an inter-operator backbone network. The GPRS operators connect to the inter-operator network via a boarder gateway (BG), which can provide the necessary interworking and routing protocols (for example, Border Gateway Protocol [BGP]). It is also foreseeable that GPRS operators will implement QoS mechanisms over the inter-operator network to ensure service-level agreements (SLAs). The main benefits of the architecture are its flexibility, scalablility, interoperability, and roaming.
Fig 3 Routing of Data Packets between a Fixed Host and a GPRS MS
Location Management
The main task of location management is to keep track of the user's current location, so that incoming packets can be routed to his or her MS. For this purpose, the MS frequently sends location update messages to its current SGSN. If the MS sends updates rather seldom, its location (e.g., its current cell) is not known exactly and paging is necessary for each down link packet, resulting in a significant delivery delay. On the other hand, if location updates happen very often, the MS's location is well known to the network, and the data packets can be delivered without any additional paging delay. However, quite a lot of up link radio capacity and battery power is consumed for mobility management in this case. Thus, a good location management strategy must be a compromise between these two extreme methods. A state model shown in Figure 4 has been defined for location management in GPRS . A MS can be in one of three states depending on its current traffic amount.
In idle state the MS is not reachable. Performing a GPRS attach, the MS gets into ready state. With a GPRS detach it may disconnect from the network and fall back to idle state. All PDP contexts will be deleted.
The standby state will be reached when an MS does not send any packets for a longer period of time, and therefore the ready timer (which was started at GPRS attach) expires.In idle state, no location updating is performed, i.e., the current location of theMS is unknown to the network.
An MS in ready state (active state) informs its SGSN of every movement to a new cell. For the location management of an MS in standby state, a GSM location area (LA) is divided into several routing areas (RA). In general, an RA consists of several cells. The SGSN will only be informed when an MS moves to a new RA; cell changes will not be disclosed. To find out the current cell of an MS in standby state, paging of the MS within a certain RA must be performed . For MSs in ready state, no paging is necessary.
INTERFACE AND PROTOCOLS
The channel allocation in GPRS is different from the original GSM. GPRS allows a single mobile station to transmit on multiple time slots of the same TDMA frame (multislot operation). GPRS can combine multiple slots in a single transmission, the effective bandwidth is increased The theoretical limit for GPRS is eight time slots. GPRS assigns a .5-millisecond time slot to each data packet. The system is notified at the time of transmission as to how many time slots or kbps are needed on both the sending and receiving devices. The ability to combine only the required number of time slots for each transmission gives GPRS the flexibility to support both low-speed and high¬speed data applications in a single network.
Time Slot Aggregation
In conventional GSM, a channel is permanently allocated for a particular user during the entire call period (whether data is transmitted or not). In contrast to this, in GPRS the channels are only allocated when data packets are sent or received, and they are released after the transmission. For bursty traffic this results in a much more efficient usage of the scarce radio resources. With this principle, multiple users can share one physical channel. A cell supporting GPRS may allocate physical channels for GPRS traffic. Such a physical channel is denoted as packet data channel (PDCH). The PDCHs are taken from the common pool of all channels available in the cell. Thus, the radio resources of a cell are shared by all GPRS and non-GPRS mobile stations located in this cell. The mapping of physical channels to either packet switched (GPRS) or circuit switched (conventional GSM) services can be performed dynamically (capacity on demand principle, depending on the current traffic load, the priority of the service, and the multislot class. A load supervision procedure monitors the load of the PDCHs in the cell. According to the current demand, the number of channels allocated for GPRS (i.e., the number of PDCHs) can be changed. Physical channels not currently in use by conventional GSM can be allocated as PDCHs to increase the quality of service for GPRS. When there is a resource demand for services with higher priority, PDCHs can be de-allocated.
Logical Channels in GPRS
On top of the physical channels, a series of logical channels are defined to perform a multiplicity of functions, e.g., signaling, broadcast of general system information, synchronization, channel assignment, paging, or payload transport. They can be divided into two categories
¢ traffic channels
¢ signaling (control) channels.
The packet data traffic channel (PDTCH) is employed for the transfer of user data. It is assigned to one mobile station (or in the case of PTM to multiple mobile stations). One mobile station can use several PDTCHs simultaneously.
The packet broadcast control channel (PBCCH) is a unidirectional point-to-multipoint signaling channel from the base station subsystem (BSS) to the mobile stations. It is used by the BSS to broadcast specific information about the organization of the GPRS radio network to all GPRS mobile stations of a cell. Besides system information about GPRS, the PBCCH should also broadcast important system information about circuit switched services, so that a GSM/GPRS mobile station does not need to listen to the broadcast control channel (BCCH).
The packet common control channel (PCCCH) is a bidirectional point-to-multipoint signaling channel that transports signaling information for network access management, e.g., for allocation of radio resources and paging. It consists of four sub-channels:
1. The packet random access channel (PRACH) is used by the mobile to request one or more PDTCH.
2. The packet access grant channel (PAGCH) is used to allocate one or more PDTCH to a mobile station.
3. The packet paging channel (PPCH) is used by the BSS to find out the location of a mobile station (paging) prior to downlink packet transmission.
4. The packet notification channel (PNCH) is used to inform a mobile station of incoming PTM messages (multicast or group call).
Channel Coding
Channel coding is used to protect the transmitted data packets against errors. The channel coding technique in GPRS is quite similar to the one employed in conventional GSM.. The selection of coding schemes is transparent to the user and determines the level of error correction the network uses to send the data. The better the link is between the user and the network, the less error correction is needed. Less error correction means higher throughput. (Coding scheme 1 has the highest level of error correction.)
Scheme Data rate (Kbps)
CS-1 91)5
CS-2 13.4
CS-3 15.G
CS-4 21.4
Table 3 : Channel Coding Schemes
101seminar and presentationtopics.com Protocol Architecture
Transmission Plane
GPRS Backbone: SGSN GGSN As mentioned earlier, user data packets are encapsulated within the GPRS backbone network. The GPRS Tunneling Protocol (GTP) tunnels the user data packets and related signaling information between the GPRS support nodes (GSNs). The protocol is defined both between GSNs within one PLMN (Gn interface) and between GSNs of different PLMNs (Gp interface). The signaling is used to create, modify, and delete tunnels. In the GPRS backbone we have an IP/X.25- over-GTP-over-UDP/TCP- over-IP transport architecture.
Sub network Dependent Convergence Protocol The Subnetwork Dependent Convergence Protocol (SNDCP) is used to transfer data packets between SGSN and MS. Its functionality includes:
o Multiplexing of several connections of the network layer onto one
virtual logical connection of the underlying LLC layer. o Compression and decompression of user data and redundant header information.
Signaling Plane
The protocol architecture of the signaling plane comprises protocols for control and support of the functions of the transmission plane. Between MS and SGSN the GPRS Mobility Management and Session Management (GMM/SM) protocol supports mobility and session management when performing functions such as GPRS attach/detach, security functions, PDP context activation, and routing area updates.
GPRS SECURITY
GPRS is secure. It is an overlay on the existing GSM network. Hence it uses all security features of the GSM network, along with it's on options.
Subscriber Identity Confidentiality
The purpose of this function is to avoid an intruder to identity a subscriber on the radio path (e.g. Traffic Channel or signaling resources) by listening to the signaling exchanges . This function can be achieved by protecting the subscriber's IMSI (International Mobile Subscriber Index) and any signaling information elements. Therefore, a protected identifying method should be used to identify a mobile subscriber instead of the IMSI on the radio path. The signaling information elements that convey information about the mobile subscriber identity must be transmitted in ciphered form. And also a ciphering method is used.
Identifying method
The TMSI (Temporary Mobile Subscriber Index ) is used in the method. Its a local number and only valid in a given location area. The TMSI must be used together with the LAI to avoid ambiguities. The network manages the databases (e.g. VLR) to keep the relation between TMSIs and IMSIs. When a TMSI is received with an LAI that does not correspond to the current VLR, the IMSI of the MS must be requested from the VLR in charge of the indicated location area if its address is known; otherwise the IMSI is requested from the MS. A new TMSI must be allocated in each location updating procedure. The allocation of a new TMSI corresponds implicitly for the mobile to the de-allocation of the previous one . In the fixed part of the network, the cancellation of the record for an MS in VLR implies the de-allocation of the corresponding TMSI. When a new TMSI is allocated to an MS, it is transmitted to the MS in a ciphered mode. The MS stores its current TMSI in a non-volatile memory together with the LAI so that these data are not lost when the MS is switched off.
GPRS Authentication
The GPRS authentication procedure is handled in the same way as in GSM with the distinction that the procedures are executed in the SGSN. In some cases, the SGSN requests the pairs for a MS from the HLR/AUC corresponding to the IMSI of the MS.
GSM confidentiality
The signaling information elements related to the user, such as IMSI, and Calling subscriber directory number (mobile terminated or originated calls) need to be protected after connection establishment . The user information such as short messages, is transferred in a connectionless packet mode over a signaling channel. It should be protected. And also User information on Physical Connections (voice and non-voice communications) on traffic channels over the radio interface should be protected. In order to achieve those confidentiality, a ciphering method, key setting, the starting of the enciphering and deciphering processes, and a synchronization are needed.
A key setting completes a process that allows the MS and the network to agree on the key Kc using in the ciphering and deciphering algorithms .It is triggered by the authentication procedure and initiated by the network. Key setting must occur on a DCCH not yet encrypted and soon after the identity of the mobile subscriber is known by the network.
The transmission of Kc to the MS is indirect. A Kc is generated on both sides using the key generator algorithm A8 and the authentication process. At the network side, the values of Kc are calculated in the AUC/HLR. At the MS side, the Kc is stored by the mobile station until it is updated at the next authentication. The encryption of signaling and user data is performed at the MS as well as at the BSS. This is a case called symmetric encryption, i.e. ciphering and deciphering are performed with the same Kc and the A5 algorithm and start on DCCH and TCH. This process can be described as follows: First, the network (i.e. BSS) requests the MS to start its (de)ciphering process and starts its own deciphering process. The MS then starts its ciphering and deciphering.The first ciphered message from the MS, which reaches the network and is correctly ciphered leads to the start of the ciphering process on the network sides. The enciphering stream at one end and deciphering stream at the other end must be synchronized. GPRS confidentiality GPRS network still needs this security feature. However the ciphering scope is different. The scope of GSM is between BTS and MS. The scope of GPRS is from the SGSN to the MS. A new ciphering algorithm GPRS-A5 is used because of the nature of GPRS traffic. The ciphering is done in the Logical Link Control (LLC) layer. The GPRS-Kc is handled by the SGSN independently from MSC .
IMPLEMENTATION
There are a number of different ways the mobile professional can be connected to the corporate network via a notebook computer, using the GPRS network. It will be up to the IS manager and telecom manager to decide which option serves their needs best. The following section provides information on the two most common scenarios: enterprise controlled connection, and connection through an ISP.
Enterprise Controlled Connection
Enterprise Centric Model
Fig 5 Enterprise Controlled Connection
This scenario allows for strong authentication and seamless allocation of IP addresses from the corporate network. The GGSN is configured with the IP address of the Dynamic Host Configuration Protocol (DHCP) server, the IP address of the Remote Access Dial-In User System (RADIUS) server, and the required radius key. The user's device will need to be configured with the desired APN and any relevant information about the DNS and Windows Internet Name (WINS) server. To become connected, the user provides all credentials required at the logon screens. The user will then be allocated an IP address and can gain access to the corporate network. The link between the corporate network and the GPRS network can be physically implemented using a variety of common methods such as leased T1/E1 lines.
Connecting Through an ISP
ISP Centric Model
¢JPH Link
Fig 6 Connection Through ISP
Like the enterprise controlled connection, this method requires authentication before gaining access to the corporate network. The difference is that the connection is made by way of an Internet Service Provider (ISP). After connecting to the ISP by selecting its APN, and completing the ISP authentication process successfully, the user is allocated an IP address and obtains PDP context. Through this link to the Internet, the user is able to connect to the corporate network. Configuration of the DNS and WINS may involve client software tools. Once PDP context is activated, access is similar to any other link from the Internet to the corporate network.
GPRS APPLICATIONS
GPRS will enable a variety of new and unique services to the mobile wireless subscriber. These mobile applications contain several unique characteristics that enhance the value to the customers. First among them is mobility , the ability to maintain constant voice and data communications while on the move. Second is immediacy, which allows subscribers to obtain connectivity when needed, regardless of location and without a lengthy login session. Finally, localization allows subscribers to obtain information relevant to their current location.
Communications
Communications applications include all those in which it appears to the users that they are using the mobile communications network purely as a pipe to access messages or information.
Intranet Access
The first stage of enabling users to maintain contact with their office is through access to e-mail, fax, and voice mail using unified messaging systems. Increasingly, files and data on corporate networks are becoming accessible through corporate intranets that can be protected through firewalls, by enabling secure tunnels.
Internet Access
As a critical mass of users is approached, more and more applications aimed at general consumers are being placed on the Internet. The Internet is becoming an invaluable tool for accessing corporate data as well as for the provision of product and service information. More recently, companies have begun using the Internet as an environment for carrying out business, through e-commerce.
E-Mail and Fax
E-mail on mobile networks may take one of two forms. It is possible for e-mail to be sent to a mobile user directly, or users can have an e-mail account maintained by their network operator or their Internet service provider
(ISP).
Unified Messaging
Unified messaging uses a single mailbox for all messages, including voice mail, faxes, email, short message service (SMS), and pager messages. With the various mailboxes in one place, unified messaging systems then allow for a variety of access methods to recover messages of different types. Some will use text-to-voice systems to read e-mail and, less commonly, faxes over a normal phone line, while most will allow the interrogation of the contents of the various mailboxes through data access, such as the Internet. Others may be configured to alert the user on the terminal type of their choice when messages are received.
Value-Added Services
Value-added services refer strictly to content provided by network operators to increase the value of their service to their subscribers.
E-Commerce
E-commerce is defined as the carrying out of business on the Internet or data service. This would include only those applications where a contract is established over the data connection, such as for the purchase of goods, or services, as well as online banking applications because of the similar requirements of user authentication and secure transmission of sensitive data.
Banking
Specific banking functions that can be accomplished over a wireless connection include balance checking, moving money between accounts, bill payment, and overdraft alert.
Location-Based Services
Location-based services provide the ability to link push or pull information services with a user's location. Examples include hotel and restaurant finders, roadside assistance, and city-specific news and information.
Advertising
Advertising may be offered to customers to subsidize the cost of voice or other information services. Advertising may be location sensitive where, for example, a user entering a mall would receive advertising specific to the stores in that mall.
CONCLUSION
In summary, GPRS presents an intermediate step in bring high speed Internet access to GSM users as the industry moves towards implementing 3rd Generation mobile services, known as UMTS (Universal Mobile Telephone Service). GPRS will thrive in both vertical and horizontal markets where high¬speed data transmission over wireless networks is required. The deployment of GPRS networks will enable a plethora of new applications ranging from mobile e-commerce to mobile corporate VPN access. Deployment of GPRS will also have a great impact on the wireless data traffic volume by generating new sources of revenue for the service providers, especially since any current GSM network user can upgrade services to include high-speed data. The only question is how soon it takes off in earnest and how to ensure that the technical and commercial features do not hinder its widespread use.
GLOSSARY
2G Second generation; generic name for second generation of
digital mobile networks (such as GSM, and so on)
3G Third generation; generic name for next-generation mobile
networks (Universal Mobile Telecommunications System
[UMTS], IMT-2000)
BG Border gateway
BGP Border Gateway Protocol
BSC Base Station Controller
BTS Base transceiver station
CS Circuit switched
DCCH Dedicated control channel
DHCP Dynamic Host Configuration Protocol
DNS Domain Name System
EDGE Enhanced data rates for GSM evolution; upgrade to GPRS
systems that requires new base stations and claims to
increase bandwidth to 384 kbps
EIR Equipment Identity Register
GGSN Gateway GPRS Support Node
Gi Reference point between GPRS and an external packet data
network
Gn Interface between two GSNs within the same PLMN
Gp Interface between two GSNs in different PLMNs
GPRS General Packet Radio Service; upgrade to existing 2G digital
mobile networks to provide higher-speed data services
GSM Global System for Mobile Communications; most widely
deployed 2G digital cellular mobile network standard
GSN GPRS Support Node (xGSN)
GTP GPRS Tunneling Protocol
GW Gateway
HDLC High-Level Data Link Control
HLR Home location register
HSCSD High-speed circuit-switched data; software upgrade for cellular
networks that gives each subscriber 56K data
IMSI International Mobile Subscriber Index
IP Internet Protocol
ISP Internet service provider
LA Local Area
LLC Logical Link Control
MAC Medium Access Control
MM Mobility management
MS Mobile station
MSC Mobile services switching center
NAS Network access server
PCU Packet control unit
PDA Personal digital assistant
PDN Packet data network
PDP Packet Data Protocol
PLMN Public Land Mobile Network; generic name for all mobile
wireless networks that use earth base stations rather than
satellites;
PSPDN Packet Switched Public Data Network
PSTN Public Switched Telephone Network
PVC Permanent virtual circuit
QoS Quality of service
RADIUS Remote Authentication Dial-In User Service
RLP Radio Link Protocol
SGSN Serving GPRS Support Node
SLA Service-level agreement
SMS Short message service
SMSC Short message service center
TCP Transmission Control Protocol
TCH Traffic channel
TE Terminal equipment
TDMA Time Division Multiple Access
TMSI Temporary Mobile Subscriber Index
TS Time slot
Um Interface between the MS and the GPRS fixed network part
UMTS Universal Mobile Telecommunications System
VAS Value-added services
VLR Visitor location register
VPN Virtual private network
WAP Wireless access Protocol; important protocol stack (Layers 4 through 7 of the OSImodel), used to send simplified Web pages to wireless devices; uses IP but replaces TCP and
Hypertext Transfer Protocol (HTTP) with UDP and WTP,
and requires pages to be written in WML rather than in
HTML
REFERENCES
[1] PCQUEST February2003
It contains a brief description of GSM - GPRS network and its architecture.
[2] Yes To GPRS, Simon Buckingam
This report shows how to make mobile data a success by maximizing the use of, and therefore the revenue from, the General Packet Radio Service (GPRS). "YES 2 GPRS" explains and interprets both the existing and future aspects of GPRS. It provides both an explanation of these developments, and analysis to help interpret them.
[3] cisco.com
Cisco's Whitepaper on GPRS has many important points about the GPRS system. It is a very dependable whitepaper that talks about different points like marketing, applications, core items in the GPRS systems.
[4] gsmworldtechnology/gprs/intro.shtml
GSM world is a good site that talks about the GPRS technology like Speed, Immediacy New Applications , Better Applications and Service Access
[5] webopediaTERM/G/GPRS.html
This is a site that has information on meanings about GPRS and explains the different parts.
[6] ee.oulu.fi/~fiat/gprs.html
This is a whitepaper that has many good points. Title is: "Lecturer:
Dr. Hannu H. Kari, Helsinki University of Technology"
[7] nokia.com
[8] trillium.com
[9] mobileGPRS.com
[10]devzone.aethersystems.com
[11] hssworld.com
[12]: adax.co.uk
ACKNOWLEDGEMENT
I thank God Almighty for the successful completion of my seminar and presentation. I express my sincere gratitude to Dr. M N Agnisharman Namboothiri, Head of the Department, Information Technology. I am deeply indebted to Staff-in-charge, Miss. Sangeetha Jose and Mr. Biju, for their valuable advice and guidance. I am also grateful to all other members of the faculty of Information Technology department for their cooperation.
Finally, I wish to thank all my dear friends, for their whole-hearted cooperation, support and encouragement.
Jalin.J
CONTENTS
1. Introduction 1
2. A bit of history 5
3. Key network features of GPRS 7
4. GPRS architecture 9
5. GPRS in action 13
6. Interface and protocols 19
7. GPRS security 23
8. Implementation 26
9. GPRS applications 28
10. Conclusion 31
11. Glossary 32
12. References 35
Use Search at http://topicideas.net/search.php wisely To Get Information About Project Topic and Seminar ideas with report/source code along pdf and ppt presenaion
Reply
seminar class
Active In SP
**

Posts: 5,361
Joined: Feb 2011
#3
11-03-2011, 04:13 PM

Presented by:
Robin Farwahan


.pptx   gprs my presentation.pptx (Size: 165.03 KB / Downloads: 93)
General Packet Radio Service (GPRS)
What is GPRS ?

 General Packet Radio Service (GPRS) is a new bearer service for GSM that greatly improves and simplifies wireless access to packet data networks
 General -> not restricted to GSM use
 Packet Radio -> enables packet mode communication over air
 Service, not System -> existing BSS (partially also NSS) infrastructure is used
Evolution of GPRS
 Salient Features of GPRS
 Important step on the path to 3G
 GPRS is an overlay network over the GSM
 Provides Data Packet delivery service
 Support for leading internet communication protocols
 Billing based on volume of data transferred
 Utilizes existing GSM authentication and privacy procedures.
 Comparison of GSM & GPRS
GPRS in INDIA
 Vodafone
 Videocon
 Idea
 Tata docomo
 Cellone
GPRS Network Elements
 GPRS has key network elements as GSNs
 SGSN : Serving GPRS Support Node
 GGSN : Gateway GPRS Support Node
 GPRS Register(also known as Home Location Register)
Working of GPRS
GPRS NETWORK
High Data Rate

 GPRS uses radio channel i.e. 200 kHz wide
 Radio channel carries digital data stream of 271 kbps
 This rate is divided into 8 time slots each carrying 34 kbps per time slot
 Data rate 14 kbps per time slot achieved after corrections
 GPRS can combine up to 8 time slots giving data rate of 114 kbps
Benefits of GPRS
 New Data Services
 High Speed (Data Rate 14.4 – 115 kbps)
 Efficient use of radio bandwith (Statistical Multiplexing)
 Circuit switching & Packet Switching can be used in parallel
 Constant connectivity
Constraints with existing network
 Connection setup time too long
 Proves expensive for congested traffic utilization
 No efficient method for packet transfers
Applications of GPRS
 Web browsing
 Corporate & Internet Email
 Vehicle Positioning
 Remote LAN Access
 Document Sharing/Collaborative working
Reply
seminar class
Active In SP
**

Posts: 5,361
Joined: Feb 2011
#4
16-03-2011, 09:50 AM


.ppt   RK-5GPRSFinal.ppt (Size: 210.5 KB / Downloads: 116)
Constraints with existing network
• Data Rates too slow – about 9.6 kbps
• Connection setup time too long
• Inefficient resource utilization for bursty traffic
• Proves expensive for bursty traffic utilization
• No efficient method for packet transfers
 Comparison of GSM & GPRS
GPRS in INDIA
 BPL Mobile
 Bharti Cellular
 Hutchison Max
 Hutchison Essar
 Idea Cellular
What is GPRS ?
 General Packet Radio Service (GPRS) is a new bearer service for GSM that greatly improves and simplifies wireless access to packet data networks
 GPRS applies packet radio principal to transfer user data packets in an efficient way b/w MS & external packet data network
Benefits of GPRS
 New Data Services
 High Speed (Data Rate 14.4 – 115 kbps)
 Efficient use of radio bandwith (Statistical Multiplexing)
 Circuit switching & Packet Switching can be used in parallel
 Constant connectivity
 Statistical Multiplexing
Salient Features of GPRS
 Important step on the path to 3G
 Standardized by ETSI
 GPRS is an overlay network over the GSM
 Provides Data Packet delivery service
 Support for leading internet communication protocols
 Billing based on volume of data transferred
 Utilizes existing GSM authentication and privacy procedures.
 High Data Rate
 GPRS uses radio channel i.e. 200 kHz wide
 Radio channel carries digital data stream of 271 kbps
 This rate is divided into 8 time slots each carrying 34 kbps per time slot
 Data rate 14 kbps per time slot achieved after corrections
 GPRS can combine upto 8 time slots giving data rate of 114 kbps
GPRS Services
Offers end-to-end packet switched data transfer

• Bearer Services
• PTP - Point-To-Point service (CLNS mode)
• PTM - Point-To-Multipoint service(CONS Mode)
• PTM-M Multicast service
• PTM-G Group call service
• Supplementary Services
• SMS Short Message Service
• CFU Call Forwarding Unconditional
• CFNRc Call Forwarding on mobile subscriber not reachable
• CUG Closed User Group
• Tele action, access to data bases
• Quality of Service
• GPRS allows defining QoS profiles
• Service precedence, reliability, delay,throughput
GPRS Terminals
 Class A
– MS supports simultaneous operation of GPRS and GSM services
 Class B
– MS able to register with the n/w for both GPRS & GSM services simultaneously. It can only use one of the two services at a given time.
 Class C
– MS can attach for either GPRS or GSM services
– GPRS Network Elements
GPRS Architecture is same as GSM except few hardware modifications :
 GPRS includes GSNs
 SGSN : Serving GPRS Support Node
 GGSN : Gateway GPRS Support Node
 GPRS Register
GSM SYSTEM ARCHITECTURE
GPRS SYSTEM ARCHITECTURE

 Interfaces
 Gb – Connects BSC with SGSN
 Gn – SGSN – SGSN/GGSN (in the same network)
 Gp – SGSN –GGSN (in different networks)
 Gf – For equipment querying at registering time
 Gi – Connects PLMN with external Packet Data Networks (PDNs)
 Gr – To exchange User profile between HLR & SGSN
 Gs – To exchange Database between SGSN & MSC
 Gd – Interface between SMS & GPRS
 SGSN – Serving GPRS Support Node
• Delivers data packets to mobile stations & vice-versa
• Detect and Register new GPRS MS in its serving area
• Packet Routing, Transfer & Mobility Management
• Authentication, Maintaining user profiles
• Its location register stores location info. & user profiles
• GGSN – Gateway GPRS Support Node
• Interfaces GPRS backbone network & external packet data networks
• Converts the GPRS packets from SGSN to the PDP format
• Converts PDP addresses change to GSM addresses of the destination user
• Stores the current SGSN address and profile of the user in its location register
• Performs authentication
• Many-to- many relations among SGSNs & GGSNs
GPRS Register
 GPRS Register is integrated with GSM-HLR.
 Maintains the GPRS subscriber data and Routing information.
 Stores current SGSN address
GPRS Backbone Network
 GSNs are connected through IP based backbone
 Two Backbones:
• Intra PLMN backbone networks that connects GSNs of the same PLMN & are private IP networks
• Inter PLMN backbone networks that connects GSNs of the different PLMN. Roaming agreement is necessary
 GPRS Tunneling protocol (GTP)
 PLMN- Inter PLMN interconnect are called Border gateways (performs security functions to protect Intra- PLMN backbone against unauthorized users and attacks).
GPRS BACKBONE NETWORK
 Protocol Stack
 SNDCP - Sub Network Dependent Convergence Protocol
 Used to transfer data packets between SGSN and MS
 Multiplexing of several connections of network layer onto one logical connection of underlying LLC layer
 Compression and decompression of user data and header information
 Data Link layer
 Divided into two sub layers :
• LLC layer (between MS-SGSN)
• RLC/MAC (between MS-BSS)
 LLC-Logical Link Control
 Establishes highly reliable logical link between MS & its assigned SGSN
 Works either in acknowledged or unacknowledged modes
 Data confidentiality is ensured by ciphering functions
 RLC/MAC Layer
 Radio Link Control(RLC)
 Establish a reliable link between MS & BSS
 Segmentation and reassembly of LLC frames into RLC data blocks
Reply
seminar class
Active In SP
**

Posts: 5,361
Joined: Feb 2011
#5
21-03-2011, 02:31 PM

presented by:
P. Srikanth


.ppt   GPRS - ppt.ppt (Size: 355.5 KB / Downloads: 76)
INTRODUCTION
 The General Packet Radio Service (GPRS) is a new non-voice value added service that allows information to be sent and received across a mobile telephone network.
 It supplements today's Circuit Switched Data and Short Message Service.
 GPRS is NOT related to GPS (the Global Positioning System), a similar acronym that is often used in mobile contexts.
 GPRS is a new service that provides actual packet radio access for Global System for Mobile Communications (GSM) and Time-Division Multiple Access (TDMA) users.
 It provides for the transmission of IP packets over existing cellular networks, bringing the Internet to the mobile phone.
 Anything the Internet offers, from web browsing to chat and email, will be available from GSM and TDMA service providers via GPRS-enabled devices.
 The main benefits of GPRS are that it reserves radio resources only when there is data to send and it reduces reliance on traditional circuit - switched network elements.
 The increased functionality of GPRS will decrease the incremental cost to provide data services, an occurrence that will, in turn, increase the penetration of data services among consumer and business users.
 In addition to providing new services for today’s mobile user, GPRS is important as a migration step toward 3G networks.
 GPRS is implemented over the existing GSM network.
ARCHITECTURE
 GPRS Acronyms
 SGSN – Serving GPRS Supporting Node
 GGSN – Gateway GPRS Supporting Node
 CGF – Charging Gateway Functionality
 HLR – Home Location Register
 PDN – Packet Data Network
 PLMN – Public Land Mobile Network
 The functions of a GGSN are below:
 Routing mobile-destined packets coming from external networks to the relevant SGSN
 Routing packets originating from a mobile to the correct external network
 Interfaces to external IP networks and deals with security issues
 Collects charging data and traffic statistics
 Allocates dynamic or static IP addresses to mobiles either by itself or with the help of a DHCP or a RADIUS server
 Involved in the establishment of tunnels with the SGSN and with other external networks and VPN.
SPEED:
 This data overlay network provides packet data transport at rates from 9.6 to 171.2 kbps.
 Additionally, multiple users can share the same air-interface resources.
How GPRS Works:
 GPRS uses packet switching to transfer data from the mobile device to the network and back. This provides significant benefits.
 Channels are shared in packet switched networks, but in circuit-switched networks each channel is dedicated to only one user.
 The mobile device can begin sending packets immediately whenever it is used.
 By overlaying the GSM network, GPRS is able to take advantage of the world's leading digital phone system, with a global subscriber base of over 646.5 million and growing (GSM Association, 01/02).
 On a packet-switched network, a device can be always connected and ready to send information without monopolizing the data channel.
 It operates on the 900 and 1800 MHz frequency bands in Europe and Asia Pacific and 1900 MHz in North America.
 Users can have high quality voice conversations using circuit switched data up to 14.4 kbps and transfer data using packet switched GPRS at up to 53.6 kbps (85.6 kbps with advanced wireless networks).
TDMA-GPRS Physical Channel Capacity
 The Time Division Multiple Access (TDMA) frame structure for GPRS.
 GPRS provides flexible allocation of physical channels to GPRS service.
 The GPRS traffic load in a given cell varies as a function of time.
APPLICATIONS
 STILL IMAGES, MOVING IMAGES
 INTERNET EMAIL, CORPORATE EMAIL
 WEB BROWSING
 VEHICLE POSITIONING
 REMOTE LAN ACCESS
 HOME AUTOMATION
 DOCUMENT SHARING/ COLLABORATIVE WORKING
 FILE TRANSFER
CONCLUSION
GSM is the most widely subscribed wireless network type worldwide, and GPRS is deployed on the GSM network, it appears that GPRS has the potential to become the most prevalent wireless data access technology. GPRS offers one of the most streamlined and logical progressions.
Reply
seminar class
Active In SP
**

Posts: 5,361
Joined: Feb 2011
#6
29-03-2011, 03:50 PM

Presented by:
Shourya Roy
Pradeep Bhatt
Gururaja K


.ppt   GPRS.ppt (Size: 367.5 KB / Downloads: 72)
What is GPRS?
 A new bearer service for GSM that greatly improves and simplifies wireless access to packet data networks,e.g to the internet.
Motivation
 Speed
 Immediacy
 New and better applications
 User friendly billing
Protocol Architechture
 Transmission Plane
GPRS specifies a tunnel mechanism to transfer user data packets .
 Signalling Plane
GTP specifies a tunnel control management protocol.The signalling is used to create modify and delete tunnels
Registration of a Mobile Node
A mobile station must register itself with GPRS network.
 GPRS attach
 GPRS detach
GPRS detach can be initiated by the MS or the network.
Session Management
After Successful attach a MS gets one or more Packet Data Protocol(PDP) address.This address is unique only for a particular session.
It consists of,
 PDP type
 PDP address assigned to MS
 Requested QoS
 Address of the corresponding GGSN
PDP-Address allocation:
 Static:Assigned by network operator of User’s home PLMN.
 Dynamic:Assigned by Corresponding GGSN.
Location Management
 MS frequently sends location update messages to inform the SGSN where it is.
 Determining frequency of update messages is non-trivial.
 The location update frequency is dependent on the state of the MS.
A MS can be in 3 states:
 IDLE
 READY
 STANDBY
Protocol Architechture
 Transmission Plane
 The protocols provide transmission of user data and its associated signalling
 Signalling Plane
 Comprises protocols for the control and support of functions of the transmission plane
Transmission Plane
 GPRS Backbone:SGSN GGSN
 GTP tunnels the user packets and related signalling information between the GPRS support nodes.
 Subnetwork dependent convergence protocol
 It is used to transfer packets between SGSN and MS
 Data link layer
 LLC(MS-SGSN)
 RLC/MAC(MS-BSS)
 Physical layer
 PLL:channel coding,detection of errors, forward error correction, interleaving, detection of physical link congestion
 RFL:modulation and demodulation
Reply
seminar class
Active In SP
**

Posts: 5,361
Joined: Feb 2011
#7
02-05-2011, 12:29 PM


.pptx   GPRS Seminar.pptx (Size: 389.64 KB / Downloads: 40)
GPRS- An Introduction
In layman language,
A bearer service for GSM that greatly improves and simplifies wireless access to packet data networks, e.g to the internet.
Goals of GPRS:
Efficient bandwidth usage for bursty data traffic (e.g. Internet)
Higher data rates
New charging models
Generalities of GPRS
Based on the existing GSM infrastructure.
Packet switching functionality
Better data transfer rates
Migration Path to 3G and Higher Networks
Service Types
Point-to-Point
Internet access by user
Point-to-Multipoint
Delivery of information (e.g. news) to multiple locations or interactive conference applications
Circuit Switched Data (CSD)
Before GPRS
A channel is allocated to user for duration of connection
Inefficient use of resources
Time-based billing
Deterministic quality of service
Resources allocated to communication
Suitable to real-time applications
Comparison
CSD

Lower bit rates
14.4kbit/s
Reserved bandwidth
Fixed access time
Time-based billing
Acronyms
MS: Mobile Station
BSC: Base Station Controller
BTS: Base Transceiver Station
MSC: Mobile Switching Controller
GMSC: Gateway Mobile Switching Controller
PSTN: Public Switched Telephone Network
VLR: Visited Location Register
EIR: Equipment Identity Register
AUC: Authentication center
HLR: Home Location Register
PLMN: Public Land Mobile Network
PDN: Packet Data Network
GPRS Architecture
New components
SGSN: Serving GPRS Support Node
GGSN: Gateway GPRS Support Node
Components needing upgrade:
HLR
MSC/VLR
Mobile Station
SGSN
Delivers data packets from and to
mobile stations
Packet Routing and Transfer from MS to GGSN
Mobility Management
Logical Link Management
Authentication
Billing and maintaining user profiles
GGSN
Interfaces GPRS backbone network with external packet data networks (PDNs)
E.g., IP networks, Internet.
Translation between PDP (packet data protocol) addresses and GSM addresses.
Authentication and billing
Many-to- many relations among SGSNs and GGSNs.
Protocol Architechture
Transmission Plane
GPRS specifies a tunnel mechanism to transfer user data packets .
Signalling Plane
GTP specifies a tunnel control management protocol.The signalling is used to create modify and delete tunnels.
Registration of a Mobile Node
A mobile station must register itself with GPRS network.
GPRS attach
GPRS detach
GPRS detach can be initiated by the MS or the network.
Session Management
After Successful attach a MS gets one or more Packet Data Protocol(PDP) address. This address is unique only for a particular session.
It consists of,
PDP type
PDP address assigned to MS
Requested QoS
Address of the corresponding GGSN
Session Management(Contd.)

PDP-Address allocation:
Static:Assigned by network operator of User’s home PLMN.
Dynamic:Assigned by Corresponding GGSN.
PDP Context Activation
MS SGSN GGSN
Routing
Packet Routing

A laptop connects with a GPRS-capable
handset
The handset communicates with GSM BS
BS sends the GPRS packets to SGSN
SGSN encapsulates packets
Handset location information is updated in
GSM components (e.g., HLR)
SGSN sends encapsulated packets to GGSN
GGSN decapsulates and sends to PDNs.
Routing(contd.)

MS roaming in PLMN1 sends IP packet to host (e.g. Web server)
Host sends reply packet to MS home PLMN2
PLMN2’s GGSN queries HLR and finds that MS is in PLMN1
Packet is encapsulated and sent to SGSN in PLMN1
Packet travels over inter-PLMN backbone not through PDN
No encapsulation-decapsulation needed on GPRS backbones
SGSN decapsulates packet and delivers to MS
Location Management
MS frequently sends location update messages to inform the SGSN where it is.
Determining frequency of update messages is non-trivial.
The location update frequency is dependent on the state of the MS.
A MS can be in 3 states:
IDLE
READY
STANDBY
Transmission Plane
GPRS Backbone:SGSN GGSN
GTP tunnels the user packets and related signalling information between the GPRS support nodes.
Subnetwork dependent convergence protocol
It is used to transfer packets between SGSN and MS
Data link layer
LLC(MS-SGSN)
RLC/MAC(MS-BSS)
Physical layer
PLL:channel coding,detection of errors, forward error correction, interleaving, detection of physical link congestion
RFL:modulation and demodulation
GSM TDMA Frame Slots and Bursts
GPRS Logical Channels

GPRS Air Inteface
GPRS Air Interface
Master slave concept
One PDCH acts as Master
Master holds all PCCCH channels
The rest of channels act as Slaves
Capacity on demand
PDCH(s) are increased
or decreased according to demand
Load supervision is done in MAC Layer
Uplink Data Transfer
Downlink Data Transfer
Multi Slot Operation
GPRS allows a mobile to transmit data in up to 8 PDCHs (eight-slot operation)
3-bit USF at beginning of each radio block in downlink points to next uplink radio block
Comparison with single-slot GSM
Higher delay at higher load
Low blocking rate
Improved Throughput
Conclusion
GPRS provides efficient access to Packet Data Networks.
Multislot operation in GPRS leads to efficient channel utilization.
GPRS is more effective for long data packet transmission than short ones.

Reply
smart paper boy
Active In SP
**

Posts: 2,053
Joined: Jun 2011
#8
24-06-2011, 10:46 AM


.ppt   ALKA GPRS.ppt (Size: 2.79 MB / Downloads: 45)
General Packet Radio Service (GPRS) A new Dimension to Wireless Communication
Contents of Presentation
GPRS and its Features
GPRS Network Architecture
GPRS Protocol Architecture
GPRS Backbone Network
GPRS interworking with External Network
Call routing in GPRS
Session Management in GPRS
Location Management in GPRS
Mobility Management in GPRS
Logical Channels of GPRS
GPRS Applications
Constraints with existing network
Data Rates too slow – about 9.6 kbps
Connection setup time too long
Inefficient resource utilization for bursty traffic
Proves expensive for bursty traffic utilization
No efficient method for packet transfers
Comparison of GSM & GPRS
GPRS in INDIA
BPL Mobile
Bharti Cellular
Hutchison Max
Hutchison Essar
Idea Cellular
What is GPRS ?
General Packet Radio Service (GPRS) is a new bearer service for GSM that greatly improves and simplifies wireless access to packet data networks
GPRS applies packet radio principal to transfer user data packets in an efficient way b/w MS & external packet data network
Benefits of GPRS
New Data Services
High Speed (Data Rate 14.4 – 115 kbps)
Efficient use of radio bandwith (Statistical Multiplexing)
Circuit switching & Packet Switching can be used in parallel
Constant connectivity
Statistical Multiplexing
Salient Features of GPRS
Important step on the path to 3G
Standardized by ETSI
GPRS is an overlay network over the GSM
Provides Data Packet delivery service
Support for leading internet communication protocols
Billing based on volume of data transferred
Utilizes existing GSM authentication and privacy procedures.
High Data Rate
GPRS uses radio channel i.e. 200 kHz wide
Radio channel carries digital data stream of 271 kbps
This rate is divided into 8 time slots each carrying 34 kbps per time slot
Data rate 14 kbps per time slot achieved after corrections
GPRS can combine upto 8 time slots giving data rate of 114 kbps
GPRS Services
Offers end-to-end packet switched data transfer
Bearer Services
PTP - Point-To-Point service (CLNS mode)
PTM - Point-To-Multipoint service(CONS Mode)
PTM-M Multicast service
PTM-G Group call service
Supplementary Services
SMS Short Message Service
CFU Call Forwarding Unconditional


GPRS Services (Contd.)
CFNRc Call Forwarding on mobile subscriber not reachable
CUG Closed User Group
Tele action, access to data bases
Quality of Service
GPRS allows defining QoS profiles
Service precedence, reliability, delay,throughput
GPRS Terminals
Class A
MS supports simultaneous operation of GPRS and GSM services
Class B
MS able to register with the n/w for both GPRS & GSM services simultaneously. It can only use one of the two services at a given time.
Class C
MS can attach for either GPRS or GSM services
GPRS Network Elements
GPRS Architecture is same as GSM except few hardware modifications :
GPRS includes GSNs
SGSN : Serving GPRS Support Node
GGSN : Gateway GPRS Support Node
GPRS Register
GSM SYSTEM ARCHITECTURE
GPRS SYSTEM ARCHITECTURE

Interfaces
Gb – Connects BSC with SGSN
Gn – SGSN – SGSN/GGSN (in the same network)
Gp – SGSN –GGSN (in different networks)
Gf – For equipment querying at registering time
Gi – Connects PLMN with external Packet Data Networks (PDNs)
Gr – To exchange User profile between HLR & SGSN
Gs – To exchange Database between SGSN & MSC
Gd – Interface between SMS & GPRS
SGSN – Serving GPRS Support Node
Delivers data packets to mobile stations & vice-versa

Detect and Register new GPRS MS in its serving area

Packet Routing, Transfer & Mobility Management
Authentication, Maintaining user profiles
Its location register stores location info. & user profiles
GGSN – Gateway GPRS Support Node
Interfaces GPRS backbone network & external packet data networks
Converts the GPRS packets from SGSN to the PDP format
Converts PDP addresses change to GSM addresses of the destination user
Stores the current SGSN address and profile of the user in its location register
Performs authentication
Many-to- many relations among SGSNs & GGSNs
GPRS Register
GPRS Register is integrated with GSM-HLR.
Maintains the GPRS subscriber data and Routing information.
Stores current SGSN address
GPRS Backbone Network
GSNs are connected through IP based backbone
Two Backbones:
Intra PLMN backbone networks that connects GSNs of the same PLMN & are private IP networks
Inter PLMN backbone networks that connects GSNs of the different PLMN. Roaming agreement is necessary
GPRS Tunneling protocol (GTP)
PLMN- Inter PLMN interconnect are called Border gateways (performs security functions to protect Intra- PLMN backbone against unauthorized users and attacks).
GPRS BACKBONE NETWORK
Protocol Stack
SNDCP - Sub Network Dependent Convergence Protocol
Used to transfer data packets between SGSN and MS
Multiplexing of several connections of network layer onto one logical connection of underlying LLC layer
Compression and decompression of user data and header information
Data Link layer
Divided into two sub layers :
LLC layer (between MS-SGSN)
RLC/MAC (between MS-BSS)
LLC-Logical Link Control
Establishes highly reliable logical link between MS & its assigned SGSN
Works either in acknowledged or unacknowledged modes
Data confidentiality is ensured by ciphering functions
RLC/MAC Layer
Radio Link Control(RLC)
Establish a reliable link between MS & BSS
Segmentation and reassembly of LLC frames into RLC data blocks
Medium Access Control(MAC)
Controls access attempts of an MS on radio channels shared by several MSs
Employs algos. for contention resolution, multiuser multiplexing on PDTCH
Both ack and unack. Modes of operation are supported in RLC/MAC layer


Physical Layer
Divided into two sub layers :
Physical Link Layer (PLL)
Physical RF Layer (RFL)

PLL – Provides a physical channel between MS and BSS
Channel coding, interleaving, detection of physical link congestion

RFL - Operates below PLL
BSSGP-(BSS GPRS Application Protocol)
Delivers routing & Quality of Service related information between BSS and SGSN
GTP – GPRS Tunneling Protocol
GTP tunnels user data packets and related signaling information between GSNs
Signaling is used to create, modify and delete tunnels
Defined both at Gn and Gp interface
Below GTP, TCP or UDP are employed to transport the GTP Packets within backbone network
Inter working with IP networks
GPRS n/w can be interconnected with an IP-based packet data network
GPRS supports both IPv4 and IPv6
GPRS n/w looks like IP sub network and GGSN looks like a IP router
DHCP, DNS servers are installed
GPRS –Internet Connection
CALL ROUTING
DATA CALL ORGINATING
DATA CALL TERMINATING
DATA CALL ROUTING
SESSION MANAGEMENT IN GPRS
Attachment & Detachment Procedure
GPRS attach
User is registered in SGSN, after authentication check from HLR
SGSN assigns P-TMSI to MS
GPRS detach
Disconnection of MS from GPRS network is called GPRS detach
It can be initiated by MS or by network(SGSN or HLR)
Session Management
Mobile Station applies for PDP address
For each session PDP context is created & it contains
PDP type
PDP addressed assigned to MS
Address of GGSN that servers access point to PDN
With active PDP context MS able to send or receive data packets
Allocation of PDP address can be static or dynamic

PDP Context Activation
LOCATION MANAGEMENT IN GPRS
State Model of GPRS MS
Location Management
Mobile station can be in 1 of the 3 states depending on traffic amount
Idle : MS is not using GPRS service
Ready : Performing GPRS Attach, MS gets into READY State
Standby : When MS does not send any packets for longer period of time,
Ready timer Expires

Routing Area Update
GSM Location Area(LA) is divided into several Routing Areas(RA)
RA consists of several cells
SGSN is informed when MS moves to a new RA
MS sends a “Routing Area Update Request” to its assigned SGSN
Types of Routing Area Update
Intra SGSN Routing Area Update
Inter SGSN Routing Area Update
Routing Area Update
Mobility Management
Consists of two levels:
Micro mobility management :
Tracks the current RA or cell of MS
It is performed by SGSN
Macro mobility management :
Keep tracks of MS’s current SGSN
Stores it in HLR, VLR, and GGSN
Channels in GPRS
Logical Channel
Traffic Channels
Signaling Channels (Control Channels)
Physical Channels
Logical Channels
Packet Data Channel(PDCH)
Physical Channel for GPRS Traffic
PDCH are taken from all channels available in the cell
Depending on current traffic load and priority of service, the physical channel are allocated to either GPRS or GSM services.
Physical channels not currently used by GSM can be allocated as PDCH to increase the QOS for GPRS
Multiframe Structure of PDCH
Billing
Applications of GPRS
Web browsing
Corporate & Internet Email
Vehicle Positioning
Remote LAN Access
Home Automation
Document Sharing/Collaborative working
Reply
deependrak4
Active In SP
**

Posts: 1
Joined: Feb 2012
#9
04-04-2012, 12:08 AM

thanku for uploadin it............it is very advantageous to me, after getting the slide i completed my seminar and presentation finally,so thanku very much.........
Reply
seminar paper
Active In SP
**

Posts: 6,455
Joined: Feb 2012
#10
04-04-2012, 09:35 AM

to get information about the topic "General Packet Radio Service" full report ppt and related topic refer the link bellow


topicideashow-to-general-packet-radio-service-download-full-seminar and presentation-report

topicideashow-to-general-packet-radio-service-download-full-seminar and presentation-report?page=2

topicideashow-to-general-packet-radio-service-download-full-seminar and presentation-report?pid=79355

topicideashow-to-general-packet-radio-service
Reply
seminar ideas
Super Moderator
******

Posts: 10,003
Joined: Apr 2012
#11
26-04-2012, 10:59 AM

GPRS(General Packet Radio Service)



.ppt   GPRS (1).ppt (Size: 200.5 KB / Downloads: 37)

1. It is a new non voice value added service that allows information to be sent and received across a mobile telephone network.
2. It supplements today's Circuit Switched Data and Short Message Service

SPEED

Theoretical Maximum Speed Of up to 172.2 kbps.
It is about ten times as fast as current Circuit Switched Data services on GSM networks
It is less costly mobile data service compared to SMS and Circuit Switched Data

IMMEDIACY


1. It facilitates instant connections.
2. It is also referred as "always connected".
3. It is a very important feature for time critical applications such as remote credit card authorization


New Application & Better Application


1. Fully Internet application such as web browsing and chatting.
2. File Transfer.
3. Home Automation (the ability to remotely access and control in-house appliances and machines).


Service Access


1. To use GPRS, users specifically need’s mobile phone or terminal that supports GPRS.
2. A subscription to a mobile telephone network that supports GPRS, use of GPRS must be enabled for that user.
3. Automatic access to the GPRS may be allowed by some mobile network operators, others will require a specific opt-in knowledge of how to send and/ or receive GPRS information using their specific model of mobile phone.
4. GPRS users can access any web page or other Internet applications


Limitation of The GPRS

Limited Cell Capacity: There are limited radio resources and voice and GPRS both uses same network resources hence they impact the existing cell capacity.

Speeds Much Lower In Reality: The total bandwidth is divided among different user. Hence a single user cannot get the transmission speed up to 172.1 kbps.

Sub-optimal Modulation:GPRS is based on a modulation technique known as Gaussian minimum-shift keying (GMSK). EDGE is based on a new modulation scheme that allows a much higher bit rate across the air interface.

Transit Delays: GPRS packets are sent in all different directions to reach the same destination. Hence one or some of those packets to be lost or corrupted during the data transmission over the radio link.

No Store And Forward: There is no storage mechanism incorporated into the GPRS standard as compare to SMS.










Reply
seminar ideas
Super Moderator
******

Posts: 10,003
Joined: Apr 2012
#12
07-07-2012, 11:10 AM

General Packet Radio System



.ppt   gprs.ppt (Size: 863.5 KB / Downloads: 32)

General Overview


GPRS stands for General Packet Radio System. GPRS provides packet radio access for mobile GSM and TDMA users.

The GPRS specifications are written by the European Telecommunications Standard Institute (ETSI), the European counterpart of the American National Standard Institute (ANSI).

GPRS is a Mobile Data Service available to users of GSM and IS-136 mobile phones.

GPRS is packet-switched and multiple users share the same transmission channel for transmitting the data.



Key Features…


The always online feature: Removes the dial-up process, making applications only one click away.

An upgrade to existing systems: Operators do not have to replace their equipment; rather, GPRS is added on top of the existing infrastructure.

An integral part of future 3G systems: GPRS is the packet data core network for 3G systems EDGE and WCDMA.



Applications…


Communications: E-mail, fax, unified messaging and intranet/Internet access etc.

Value-added services: Information services and games etc.

E-commerce: Retail, ticket purchasing, banking and financial trading etc.

Location-based applications: Navigation, traffic conditions, airline/rail schedules and location finder etc.

Vertical applications: Freight delivery, fleet management and sales-force automation.

Advertising: Advertising may be location sensitive. For example, a user entering a mall can receive advertisements specific to the stores in that mall.


Reply
Guest
Thinking To Register

 
#13
07-02-2013, 09:58 AM

this is new topic so i m going through it
Reply
Guest
Thinking To Register

 
#14
09-02-2013, 11:50 AM

hi this is shreeya.. i need a seminar and presentation report on gprs technology as soon as possible..
Reply
Guest
Thinking To Register

 
#15
10-09-2013, 03:41 PM


I need the abstract of General Packet Radio Service(GPRS)
Reply

Important Note..!

If you are not satisfied with above reply ,..Please

ASK HERE

So that we will collect data for you and will made reply to the request....OR try below "QUICK REPLY" box to add a reply to this page

Quick Reply
Message
Type your reply to this message here.


Image Verification
Please enter the text contained within the image into the text box below it. This process is used to prevent automated spam bots.
Image Verification
(case insensitive)

Possibly Related Threads...
Thread Author Replies Views Last Post
  web spoofing full report computer science technology 13 9,016 20-05-2016, 11:59 AM
Last Post: Dhanabhagya
  REDTACTON A SEMINAR REPORT project girl 2 567 25-04-2016, 03:58 PM
Last Post: mkaasees
  PROGRAMS USING RAW SOCKETS (LIKE PACKET CAPTURING AND FILTERING project girl 2 2,158 30-10-2015, 10:03 AM
Last Post: Guest
  seminar report on cyber terrorism pdf jaseelati 0 331 23-02-2015, 01:49 PM
Last Post: jaseelati
  microwind software free download jaseelati 0 287 23-02-2015, 12:47 PM
Last Post: jaseelati
  seminar report on internet of things jaseelati 0 379 29-01-2015, 04:51 PM
Last Post: jaseelati
  nano ic engine seminar report jaseelati 0 322 21-01-2015, 01:43 PM
Last Post: jaseelati
  google glass seminar report pdf jaseelati 0 345 21-01-2015, 01:41 PM
Last Post: jaseelati
  rolltop laptop seminar report jaseelati 0 287 17-01-2015, 03:15 PM
Last Post: jaseelati
  wireless video service in cdma systems wikipedia jaseelati 0 385 13-01-2015, 04:29 PM
Last Post: jaseelati