Internal Use OnlyControl Plane Architecture at UR11.1 Version1. OverviewZTE RNC contains RCB board, which is divided into RCP and RSP used to process control plane protocol at U9.3 version. RCP is mainly used to handle the radio protocol including CELL-related and UE-related procedure. RSP is mainly used to handle signaling transport protocol including SCTP and M3UA. Every Cell and UE belongs to a RCP and the relation is configured before RCP startup and cant be changed during running.The above architecture has an advantage of high system reliability. However, there is a shortage. The traffic in the telecommunication network could be different respect to time and area. If the NodeB and cell is affiliated to a given RCP, sometime traffic in these NodeBs and cells could exceed the maximum capacity of the RCP, and the other boards in the same RNC might not be fully utilized.To improve RCB board utilization efficiency, ZTE RNC introduces Control Plane Resource Sharing at UR11.1 version. Instead of RCP and RSP, RCB board is divided into DMP and CMP. DMP mainly handle UE-related radio procedure and all DMPs serve as a pool. CMP mainly handle NodeB/CELL-related procedure and signaling transport procedure. This architecture can avoid local congestion in some boards due to disproportionate traffic distribution in networkControl Plane Resource Sharing Technology has a huge advantage that it can improve RNC Capacity. At U9.3 Version RNC with 34 RCB boards has 7000K BHCA, if upgrade to UR11.1 Version, the capacity of RNC with 34 RCB boards will increase approximate 30% to 9000K BHCA.2. Logic Board Function2.1. Protocol Stack OverviewRefer to Figure 1, DMP handle dedicated procedure of RANAP/RNSAP/NBAP and RRC. CMP handle common procedure of RANAP/RNSAP/NBAP and transport protocol including SCCP, M3UA, SCTP, MTP3B and ALCAP.

Figure 1 protocol distribution2.2. DMP functionDMP only handle UE-related radio procedure such as RRC/RANAP/RNSAP/NBAP dedicated procedure and dedicated radio resource algorithm. There is no resource configuration belong to DMP. So, when a DMP is added and physical board is configured, this DMP will serve UE immediately, no extra configuration is needed. 2.3. CMP functionCompared to DMP, CMP has complex structure and function. First, CMP serve NodeB and CELL. NBAP Common procedure and Cell radio resource algorithm are implemented at CMP. Every NodeB and Cell is also affiliated to a given CMP as pre-configuration.Secondly, CMP handle connectionless signalling of RANAP and RNSAP(e.g. paging).Third, signaling transport protocol such as SCCP/M3UA/SCTP/MTP3B/ and transport control plane protocol such as ALCAP is resident at CMP, meantime CMP also manage the transport bandwidth resource.3. Basic DBS Configuration RuleWe list some basic config rule as following. When a NodeB is added, a CMP module must be specified to serve it. The management module of NodeB cannot be changed during running. Uplink Scrambling Code is managed by CMP. A SC range needs to be configured for every CMP and the range value must be different. SCTP link is also managed by CMP. If a SCTP link is used to transport IUB message of a NodeB, then the module of the SCTP Link must be same to the host module of the NodeB. For SCTP link used to IU/IUR, the module can be an arbitrary CMP. It is recommended that the number of SCTP link used to IU/IUR is equal among CMPs if there is more than one SCTP link used to IU/IUR. For transport resource management, PathGroup and TrPath is mainly resource object. They also need a configured CMP module. TrPath belong to a PathGroup and the module of TrPath must be same to the module of its parent PathGroup. If a TrPath is used to manage IUB resource of a NodeB, then the module of the TrPath must be same to the module of the NodeB. It is recommended that the number of PathGroup used to IU/IUR is equal among CMPs if there is more than one PathGroup used to IU/IUR.Finally, consider the system high reliability and function characterization, we strongly suggest that the CMP logical board type is split into two sub-type at OMC level: CMP(Iub) and CMP(NotIub). CMP(Iub) is used to IUB-related config. CMP(NotIub) is used to IU/IUR-related config.

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CMP

RANAP-D/NBAP-D/RNSAP-D/RRC