1. Wireless packet gateway for CDMA2000 system PDSN
A standard CDMA2000 network includes terminal devices, mobile terminals, base stations, base station controllers (PDSN Packet Data Serving Node, and other CDMA) Internet equipment. PDSN is a Packet Control Function (PCF) and a packet network interface device on the BSC side. PDSN provides gateway services between CDMA2000 Wireless Access Network (RAN) and IP packet networks.
Figure 1 Cisco CDMA2000 Network Packet Domain Solution
In this legend, the mobile station supports simple IP and mobile IP access. When the mobile station is accessed, the BTS is accessed through the wireless interface, and the BTS is connected to the BSC. BSC transmits user data through the A10 / A11 interface through the A10 / A11 interface through the A10 / A11 interface, and the A11 interface transmits control information, which is also referred to as the R-P (RAN-TO-PDSN) interface. The IP network is a PI interface through the PDSN and the external network. As part of the call setup step, the A10 session (GRE channel) can be established between the CBSC / PCF and PDSN, and the establishment of the A10 session is to use CBSC / PCF. The corresponding step of the A11 interface between the PDSN is established.
Cisco Packet Data Server Node (PDSN Packet Data Serving Node) enables mobile operators to provide new CDMA2000 packet data services. Cisco PDSN supports mobile terminals to Internet, company intranets (accessible through secure virtual private network [VPN]) and wireless access protocol (WAP) servers. Cisco PDSN is a packet service gateway running on the 7200, or 7600 router platform, providing simple IP and mobile IP access, external proxy support, and packet transmission. And assume certified, authorized, accounting clients.
Cisco PDSN supports all required standards, including 3GPP2 TSG-P standards, wireless IP network standards (also known as TR45.6 or TIA / EIA / IS-835), the standard defines the overall structure of the CDMA2000 network. Cisco PDSN includes enhanced mobile IP, telecommunications compensation, compression, security, and authentication. Cisco also supports interoperability specifications (also known as TR45.4 or TIA / EIA / IS-2001) of 3GPP2 TSG-A-CDMA2000 access network interfaces. The 3GPP2 TSG-A standard focus is the interface between RAN and the RAN and PDSN. Cisco PDSN uses proven Cisco hardware and software, in line with various standards, providing a variety of performance to enhance accessibility, scalability, and security.
The Cisco PDSN solution provides all standard interfaces, including support for simple IP access methods (including simple IP vpdn), mobile IP, etc., and provides many enhanced customer experience, increase availability, scalability, and security value-added functions. . This article lists the specific Internet Engineering Task Force (IETF) RFC and various functions.
Table 1 Cisco PDSN function and advantages
Function Description The advantage is in line with the standard compliance with 3GPP2TSG-P (TIA / EIA / IS-835) and 3GPP2TSG-A (TIA / EIA / IS-2001) to interoperate with other standards. Proxy Mobile IP provides IP mobility to mobile station (MS) that does not support mobile IP node services. When modifying PDSN, the non-mobile IP client can keep their IP address. Improve customer experience without upgrading the customer experience by maintaining IP applications during customer roaming. PDSN group and intelligent PDSN Select the best PDSN in the PDSN group according to the current MS session. Implementing Best Performance No Interrupt Service Extensions Maximize Multi-IP stream with unique NAI can share a single PPP connection. Increase the flexibility of the solution by sharing a public mobile access device for multiple PCs. Standard Cisco Hardware Platform Cisco Hardware Platform has been proved in some large network environments around the world. Maximize risks and speed up network deployment. CiscoIOS Features Set PDSN has standard Ciscoios feature sets, including Richip, security, QoS, mobile IP, and voice / data integration. Use advanced features to shorten the listing time to provide more competitive solutions >> Back to top
2. Wireless packet gateway for the UMTS system GGSN
Cisco GGSN provides secure, efficient conversion connections between GPRS or UMTS networks and external part of the network for mobile communication operators. GGSN can protocol the GPRS packet packet or UMTS network packet packet or the Packet packet of the GSM network, allowing these packet packets to remote networks, which can be connected to a variety of different data networks.
The Cisco GGSN enables support for UMTS (Universal Mobile Telecommunications Service to support 2.5G and 3G mobile services on the same device. In addition to supporting GTP (GPRS Tunneling Protocol version 1 and version 0, there is also a comprehensive UMTS service quality assurance (QoS), R99 billing, 2.5G / 3G by administrative information library (MIB) and Simple Network Management protocol (SNMP) Perform management and fully compatible with the characteristics of Cisco GGSN version 3.
Cisco GPRS / UMTS Piece Solution
The Cisco GGSN solution allows mobile wireless operators to provide a wider wireless data service for the second generation and third generation mobile communication users. Cisco GGSN supports the 3rd Generation Partnership Project (3GPP) standard GPRS feature, but also provides some value-added features. For example, group virtual network (VPN) access, enhanced security, advanced billing capabilities, access point name (APN) extension, manage APN and IP addresses - all from rich and mature Cisco iOS feature sets , And a widely verified Cisco router platform.
For example, the Characteristics of the Cisco GTP server load balancing (SLB) makes GGSN have powerful processing capabilities and higher scalability. GPRS load balancing uses the Cisco IOS SLB feature to provide stronger scalability for deploying GGSN, and increase the network reliability in the GGSN GPRS environment. In the GPRS environment, SGSN issues a PDP Context activation request to the IP address of the Cisco GGSN virtual server on the SLB router. SLB uses Dynamic Feedback Protocol (DFP), based on each GGSN currently active PDP Context number, CPU utilization and memory calculates the weight of each GGSN. And press the PDP Context activation request to the real GGSN. Cisco IOS SLB improves the availability of GGSN services by using DFP. When the SLB monitors the GGSN failure, the GGSN is immediately removed from the load balancing list, ensuring that all new connection requests can be redirected to the GGSN that provides service. GGSN software upgrades and hardware maintenance can be performed without interrupt network services. The following table lists some security features that have been added after GGSN to cope with attacks from mobile users. Those characteristics means protecting mobile users from external network attacks and protecting the network from mobile users.
Table 2 new security features
Features Describe the VRF feature of VRF-BASEDVPNSWITCHINGGSN implements a plurality of separate local routing domains (virtual routers) on a GGSN and map the APN to VRF. This allows users to be flexible and safely connected to the Group VPN. The use of VRF features has the following advantages: security, reliability and scalable, flexible shielding external access CiscoGGSN can disable access from other PLMNs to local users. This allows operators to limit access based on this PLMN. Shielding User Attack This feature is used to protect the network from being infringed by the user. Typically, in the GPRS network, use the firewall deployed after the GGSN to protect the network from an external attack, while the characteristics of the mask user attack arrives at the GTP tunnel end point, and the start route effectively prevents from the user terminal. attack. Repeat IP address protection prevents the repeated IP address to the user. When discovers the IP address, a protective mechanism is provided to enable the operator's network devices, including CG, SGSN, GGSN, DHCP servers, RADIUS servers, and DNS servers. Preventing address spoofing GGSN can monitor whether the source address of the user data in PDPContext is consistent with the address assigned to the user. This allows GGSN to check the IP address inside each T-PDU. If this address is inconsistent with the corresponding PDP address, the packet will be discarded. User to User Traffic Redirection In the GPRS network, the user data is started to be routed to the GI interface of GGSN. The operator can deploy security devices (such as firewalls) after the GI interface to protect user terminals and PLMNs. . However, if the two user terminals are connected to the same GGSN and know the IP address of the other party, the two users can directly communicate without the need to send the packet to the GI interface. This makes a potential security hazard in the network, and users can use the user traffic redirection feature to set the user data stream to a separate device outside a GGSN (such as a firewall). This feature can be implemented based on each APN.
3. Wireless packet gateway PDSN / GGSN hardware platform
The Cisco PDSN / GGSN solution is based on a widely verified Cisco IOS software and IP router platform and provides low cost, trusted, and high security data. The iOS software equipped by Cisco GGSN is based on a set of mature technologies, which have been widely used on the core of the Internet. Cisco PDSN / GGSN can run on a multiprocessor WAN application module MWAM module on the Cisco 7206VXR platform or Cisco7600. MWAM can provide high performance, scalable distributed service processing features for the Cisco 7600 Series. Cisco MWAM allows service providers to deploy, configure, and manage value-added services for businesses and personal users on network edge deployment. This innovative service module can provide the world's service providers with the most comprehensive edge aggregation services. 4. Network management
The network management function of wireless packet gateway provides a mechanism for supporting operations related to CMDA2000 and GPRS / UMTS. Cisco's management system has a range of console and SNMP management tools designed to reduce operating costs. Hardware can be managed by MWC, MWC includes error management, APN management, and configuration management for Cisco PDSN / GGSN. It is also a network element management system that makes new mobile wireless services easier. It provides errors, configuration, billing, performance, and security management functions based on CiscoWorks and network element management, and help mobile operators from circuit exchange-switched 2G-based IP-based 2.5G and 3G. Conversion.
5. Advantages of Cisco wireless packet gateway
As a leader in the data network, Cisco's equipment carries data traffic that is much proportional to today's world's interconnected network clock. In addition to the standards with standards defined by 3GP / 3GPP2, the Cisco IOS software built in PDSN / GGSN makes the Cisco GGSN solution in the relevant fields unique in the relevant fields. Cisco IOS software is based on a set of mature network technology, which has been widely used on the core of the Internet. High quality, high credibility and high scalability have enabled Cisco in the data network industry, and now Cisco integrates this powerful routing to the PDSN / GGSN solution.
