6.5 Application in IP RAN
IP backhaul focuses on the interconnection between base station and wireless service
control point (Gateway) to realize the implementation of mobile IP voice and data
services. In traditional 2G network, BTS uses TDM E1/T1 to access BSC (Base Station
Controller). With the development of wireless network, IP Node B gradually becomes
popular in 3G network as it can provide Ethernet interface to enable upstream traffic via
the switch. The wireless traffic accesses/aggregates to RNC. IP backhaul network
requires clock synchronization, high scalability and high reliability. ZXR10 8900E can be
deployed on the aggregation node of IP Backhaul to serve for the entire network.
IP backhaul requires end-to-end clock synchronization. 8900E provides SyncE+1588v2
solution which synchronizes high-precise clock signal like BITS to all base stations.
The BS access ring and aggregation ring have ring protection requirements. 8900E
realizes 50ms switchover via ZESR+ (EAPS) Ethernet ring.
By supporting superVLAN and QinQ technologies, 8900E reduces the load of the
gateway when multiple base stations get accessed, which consumes less IP
address, realizes unified base station management and makes the network more
scalable.
8900E supports VPLS/H-VPLS and MPLS L3VPN technologies to give better
support to multipoint-to-multipoint access.
Common IP Backhaul networking mode is as shown in Figure 6-5.
Figure 6-5 Application in IP RAN
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