The centralized processing of concentrative resources is conducive to optimizing network capabilities and making full use of network resources. From the distributed base station technology on the wireless side, to the MSCPOOL of the core network, to the C-RAN overall network architecture proposed by China Mobile, all reflect the concept of centralized and optimized configuration of network resources.
The benefits of this are obvious, on the one hand, it can effectively save network investment, on the other hand, it can effectively save computer room resources when the site resources are very tight today. At the same time, as network resources are more fully utilized, the energy consumption of the entire network naturally decreases accordingly.
In this transformation of network technology, although the GSM network is not at the forefront of the application of new technologies, in the face of the fact that most users are still in the G network, China Mobile has to transform the G network. In this regard, Ericsson experts said that the driving force for this transformation comes from two points: First, to make up for the blind spot coverage. Second, meet capacity growth.
At present, MSCPool technology has been applied to the networking strategy of 2G and 3G common core networks, and has achieved good results. In the past, distributed base stations were mostly used in 3G networks, but with the new round of capacity expansion of China Mobile's GSM network, China Mobile Group has made it clear that the proportion of distributed base stations in new base stations in 2011 should not be less than 60%. The ultimate goal of C-RAN is not only to concentrate resources, but also to introduce cloud computing technology into the resource pool to achieve true cloudification of the network.
Must have an excellent failure rate
Talking about the benefits of distributed base stations, Ericsson experts said that because distributed base stations have no feeder losses, compared with indoor macro base stations, when covering the same area, the output power can be smaller, so energy consumption can be reduced. Since the output power is reduced, thereby reducing the heat dissipation, the volume and weight of the device can also be reduced, so it can be more easily installed. Because RRU is an outdoor device installed on the top of the tower, it does not require a computer room, thereby reducing the operator's investment in the computer room, air conditioning, and power supply. In general, distributed base stations are of great benefit in reducing the TCO of operators.
From an application perspective, GSM and WCDMA distributed base stations are no different. Since China Mobile began to deploy distributed base stations on a large scale, and distributed base stations are deployed on towers, which is not conducive to maintenance, it is required that distributed base stations must have a particularly excellent MTBF. If the failure rate is too high, it will greatly affect the maintenance of the operator and will seriously affect the operation of the network.
Double-layer pool
In the context of IP throughout the network, it is particularly important to make more effective use of core network resources. In this regard, Ericsson ’s experts said that Ericsson proposed a reliable and optimized network solution of MSSPool on the basis of MSCPool, that is, pooling at the MSC level and pooling at the MGW level as well, optimizing and rationalizing resources at the media gateway level. Local use, but also achieve disaster recovery at the MGw level.
Based on the MSSpool solution, operators can enjoy more network benefits based on the advantages of the original GSMMSCpool:
First, more flexible MGw selection: MGw can be optimized according to its reachability, capacity, geographic location, etc., so that all calls can occupy only one MGw in the pool as much as possible, combined with the actual situation of the existing network to enhance the resources of the MGw level Optimize use.
Second, increase the reliability of the MGw gateway level: On the basis of disaster recovery at the MSCserver level, the MGw level can also implement real-time automatic disaster recovery, making the network stronger.
Third, 2G code-free operation (TrFO): With the IP of the A interface, the end-to-end code-free operation of the GSM network can be implemented in the MSSpool, that is, the GSM network can also implement TrFO. On the one hand, the transmission bandwidth of the network is saved, and more importantly, the call quality of the voice service is improved.
Fourth, provide high-definition voice services: At present, the core network and many terminals already support broadband AMR coding (AMR-WB), but due to the current ADM TDM transmission restrictions, it is impossible to transmit AMR-WB information end-to-end. With the implementation of the IP of the A interface, it has become a reality to transmit AMR-WB encoded high-definition voice information on the basis of GSMTrFO. Operators may consider introducing AMR-WB codec in the GSM network to improve voice quality.
Fifth, effective bandwidth saving: After the core network is fully IP, IP multiplexing and other functions can also be introduced, which greatly saves transmission bandwidth and saves operators' network investment.
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