With the large-scale deployment of 3G networks in China, 3G services will enter a period of rapid development. The mobile bearer network will also be fully IP-enabled from the core to the access end-to-end. In the next few years, the IPization process of China's mobile service network and bearer network will be significantly accelerated with the full deployment of 3G networks. With the introduction of 3G mobile broadband services, it will enter a period of full IP.
Mobile backhaul overviewBased on Alcatel-Lucent's leading technology in wired and wireless, Shanghai Bell offers a highly integrated and complete mobile backhaul solution. This architecture is the most likely implementation of integrated end-to-end management, covering a variety of different areas of technology - wired, wireless, etc., simplifying operation and maintenance. It greatly reduces OPEX, increases scalability and availability, enabling broadband services to be deployed on any medium, including fiber, copper, and wireless.
Multiple choices for mobile backhaul IPMobile backhaul IP has a variety of alternatives, such as Carrier Ethernet, PTN and MPLS, and more solutions can be derived through a combination of technologies. However, through a large number of laboratory tests, commercial trials and commercial cases, we found that operators' choices are focused on IP/MPLS and PTN solutions in terms of technology maturity, business capabilities, and operational habits.
First, MPLS improves the reliability and availability of IP networks to achieve carrier-class transmission performance. Second, MPLS provides the bearer and convergence capabilities of multiple services such as TDM, ATM, and Ethernet, making IP networks an ideal multi-service. Transport platform. Since most of the current metropolitan area networks are based on IP/MPLS technology, it is natural for us to associate the IP of the mobile access network with the development of the operating mall domain network.
PTN, on the basis of carrier-class OA&M that inherits the traditional SDH network, provides flexible packet and circuit transmission capabilities, which maximizes the operator's operating experience on the SDH network and makes full use of the original SDH resources.
Mobile backhaul based on IP/MPLS convergence1. Fixed and mobile convergence
For integrated service operators, the unified carrying of fixed and mobile services on the IP metropolitan area network will not only greatly reduce investment and operation and maintenance costs, but also facilitate the convergence of fixed and mobile services. By addressing mobile backhaul with IP/MPLS, operators can implement fixed mobile convergence quickly and at relatively low cost.
Further, operators should consider whether they can be deployed on existing IP/MPLS metropolitan area networks. The advantages of this approach are obvious: minimal changes, minimum investment. The problem is that most metropolitan area networks in China are designed to address the access of mass customers or group users, or 2G core network traffic with very limited traffic. This kind of architecture is fundamentally unable to meet the demand for 3G voice and other high-level data services (such as IPTV, mobile streaming media, etc.) that are sensitive to quality of service. This situation also exists in foreign operators, most of them. The operator has adopted a separate construction method: the original metropolitan area network is reserved, the HSI service of the mass user is not moved, and a new IP metropolitan area network is constructed. We can call it the second plane, on the new plane. By deploying edge devices that provide fine-grained control (such as the 7750SR) to meet the needs of carrying key services, operators can well solve the impact of low-end user traffic on key services, and ensure the availability and security of critical services. On the basis of this, it also makes full use of the new plane to achieve the integration of fixed and mobile services.
2. Fusion of multiple access methods
The main goal of the mobile backhaul network solution is to greatly reduce the transmission cost per bit to adapt to the trend of mobile services from voice-oriented to voice and data, and finally to data services. IP/MPLS base station backhaul solution The MPLS pseudowire technology based on the IETF standard can provide all interfaces from TDM, ATM, FR to Ethernet, and is a true multi-service access technology.
Shanghai Bell's IP/MPLS-based mobile backhaul solution is based on 7750SR, 7450ESS or 7710SR, 7705SAR series service routers. It uses IETF standard pseudowire technology to encapsulate and transmit various service data, including Ethernet frames and ATM letters, in the MPLS tunnel. The yuan and circuit simulation signals achieve the purpose of carrying multiple services in a single IP/MPLS network. In the Shanghai Bell mobile backhaul solution, the 7705SAR service aggregation router deployed at the base station is a key link. It connects the existing base stations of multiple interfaces to the backhaul network and performs data format conversion functions, and puts n&TImes; E1TDM, n&TImes ; E1ATM / IMA, n & TImes; E1MLPPP or a variety of signals in Ethernet format to convert to various types of pseudowires in IP / MPLS networks.
PTN-based mobile backhaul solutionFor operators facing rapid packet traffic growth, Shanghai Bell's 1850TSS, 1850TSS-5/5C, TSS-160 and TSS-320 can be deployed to provide maximum transmission efficiency and traffic aggregation capability for TDM and IP traffic. These solutions fully exploit the capabilities of MSPP to provide backhaul for TDM and Ethernet traffic. The appeal of the 1850TSS is that it not only continues the operational experience accumulated by SDH operators familiar with TDM transparent transmission, but also gives operators sufficient freedom to choose when to evolve to all IP through pseudowire technology, and what kind of progress Evolution to all IP.
In the initial stage, the RAN aggregation layer can be packetized and modified. The 1850 TSSPTN is used to set up the aggregation layer and the MSTP hybrid network. The TDM and data boards in the 1850 TSS are flexibly configured according to requirements. The access layer builds the PTN on demand and the original TDM service is connected. The incoming mode is unchanged. The newly added services can be accessed by the access products in the 1850TSS series through the PTN mode, or the original MSTP can be taken. With the development of the mobile RANIP process, the PTN gradually infiltrates, and the data service is accessed through the PTN. The TDM can be accessed through the naTIve mode or through the CES emulation function of the 1850 TSS, and gradually complete the PTN transformation of the RAN until all The services are all accessed through the PTN mode of the 1850 TSS. The aggregation layer 1850 TSS devices are all configured with data boards.
ConclusionThe construction of mobile backhaul should not be limited to considering short-term and current business needs. It should also consider the compatibility of existing services and the long-term needs of network development from the perspective of technology and cost. In other words, in the trend of broadband mobile services, mobile backhaul solutions should not only target the current 3G backhaul requirements, but also how to solve the 2G and 2.5G backhaul, how to integrate with the carrier's existing network in the future. .
â– Successful case
Alcatel-Lucent actively participated in the construction of the bearer network of Verizon, Orange, SFR, Vodafone Spain, Vodafone Italy, Telstra and other internationally renowned operators' mobile networks, and received wide acclaim.
In October 2007, Alcatel-Lucent provided New Zealand Telecom with IP/MPLS core network solutions and wireless access solutions. The project involved products such as 7750SR, 7705SAR and 5620SAM, and helped customers select the MPLS overlay deployment model based on the current network conditions, and carried out design work including MPLS, multi-service QoS, network reliability, network synchronization and network management.
In 2009, NTT DoCoMo selected Alcatel-Lucent as a solution provider to deploy LTE and 3G mobile bearer networks, of which more than 6000 sets of 1850TSS-5 were only available on the base station side.
In China, the PTN-based solution has passed the tests of various operators and achieved excellent results. The indicators in the network self-healing, clock synchronization, and voice service jitter fully meet the needs of operators. At China Mobile, our 1850TSS series (1850TSS-5/-5C/-160/-320) has served back to 2G and 3G base stations in 11 provinces, with a total of nearly 2,500 TSS series devices deployed.
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