The Gateway GPRS Support Node (GGSN) is a main component of the GPRS network. The GGSN is responsible for the interworking between the GPRS. Single IP Cisco GGSN Usage Notes and Prerequisites Configuring Support for GGSN-Initiated Update PDP Context Requests Gprs tutorial. by packet paging to notify the GPRS 17 The GPRS access modes specify whether or not the GGSN requests user authentication.
|Published (Last):||28 August 2012|
|PDF File Size:||5.28 Mb|
|ePub File Size:||14.70 Mb|
|Price:||Free* [*Free Regsitration Required]|
What is mostly of interest here is: For the CSD case, NAS telephone numbers, as well any conditions associated with user sessions termination upon idle timeouts. In this case, the Access Request user-name and password would be populated with some dummy values.
Note that Wireless LAN-based access is key in many hot-spot-based deployment scenarios more in Chapter 9 and is appealing for its high data rate and the low cost per byte. The different service policies may, for instance, allow the GGSN to route user packets to different networks depending on the domain component of the username, thus allowing a subscriber to select a specific network and the service it offers based on this value.
It can be as simple as a round robin, or “pick the first in the list and scan through the list instead of retrying the same IP address when no response from the GGSN is heard back. Whether manual configuration or PKI infrastructure is used for authentication keys distribution.
This reluctance has, in essence, stopped the deployment of such a solution to date.
GPRS Network Architecture | GGSN SGSN PCU |
This access mode, if accompanied by the usage of RADIUS Authentication or Accounting, can also be used to provide single sign-on by transferring session-related information to a services access layer that distributes the user identity and IP address used for mapping to applications.
The PCU itself may tutoriql a separate physical entity, or more often these days it is incorporated into the base station controller, BSC, thereby saving additional hardware costs.
Some modifications may be required to the BTS, but often only tktorial software upgrade is required, and this may often tuhorial achieved remotely. These costs are for general maintenance and other operational costs that may be incurred. Usually, SLAs include availability figures, packet loss per class of service, replacement policies of failed units in the customer network if the operator also provides the customer premise equipment, troubleshooting and help desk support to administrators, technical training for administrators, IP addressing information, and the scope of the variables the customer can remotely manage.
The first step is to configure OpenBSC for gprs support. The Selection Mode information element carried in the Create PDP context request determines in which way the user session is incoming for a specific access point—that is, according to which criterion the user was allowed to use the APN by the network SGSN. Power management RF technology Test Wireless. The account setup and service sign-up methods for subscribers associated with the customer network must be part of the agreement.
The upgrades for gggsn GPRS network are not as large as starting from scratch and rolling out a new network. In this tutoriak network ggxn could evolve their networks through GPRS and possibly EDGE to the full 3G networks without having to replace and install more new equipment than was absolutely necessary.
Generally, the user authentication in this method suffers from the same shortcomings as in the Simple IP mode. This document, beyond the legal and business aspects, sets the customer expectations and also defines the service the customer will ultimately receive.
GPRS Network Architecture Tutorial
Unfortunately, though, carriers are concerned about gutorial book configurations on terminals and also have shown reluctance to deploy advanced roaming solutions before the service has really taken off within the home network.
This scenario is also being repeated by 3G, except in this case, greenfield operators that is, new companies starting up 3G businesses without having been a player in 2.
All the databases involved in the network will require software upgrades to handle the new call models and functions introduced by GPRS. For the sake of avoiding this kind of interesting but unproductive debate, at least for those who kindly decided to read this book, we opted to use our own terminology, which we consider more appropriate. If this option is not given then the net option is used as a substitute. The BTS can also require a software upgrade but typically does not require hardware enhancements.
OpenBSC GPRS – Cellular Network Infrastructure – Open Source Mobile Communications
Existing roaming solutions are limited in scope, and no significant commercial deployments have been recorded at present nor are expected in the short term. GPRS attempts to reuse the existing GSM network elements as much as possible, but to effectively build a packet-based mobile cellular network, some new network elements, interfaces, and protocols for handling packet traffic are required.
Accept only home network subscribers. This constitutes a really simple setting that can also guarantee a sufficient level of end-to-end security when the L2TP tunnels are secured via IPSec transport mode and PPP encryption is negotiated.
Along with the packet data transport the GSM network accommodates multiple users to share the same air interface resources concurrently. The SGSN will connect to it. A number of new elements are needed for the network, but these can operate alongside the existing elements meaning that the GPRS capability is an upgrade to the network and not a completely new network structure.
The greatest limitation of this access mode is in its trust model, which implies the external network to fully rely on the wireless network to provide user authentication.
Broadly speaking, this access method would map to Simple IP access mode in our taxonomy see below the section providing a detailed description of this access modeshould we elect to engage in terminology mapping. IP architecture with PCO-based access mode. Tutoriql allows for the evolution of the authentication protocols used tutoral the need of changing the NAS and AAA infrastructure.
These new terminals will be backward compatible with GSM for voice calls.