BBU软件架构.pptx

BBU Software Architecture武汉虹信通信技术有限责任公司讨论提纲第页BBU hardware architecture第页BBU内部功能划分R2 采用单板架构2块FPGA，3块DSP和1块PowerQuick CPU，1块Ethernet Switch和1块SRIO SwitchCPU使用Linux 操作系统CPU 处理L2+ protocolDSP L1上行处理FPGA L1下行处理第页eNB function mapping LTE functions in eNode-B Selection of aGW at UE attachment Routing towards aGW at UE initial access NAS messaging encapsulated by RRC for tx over radio Scheduling and transmission of paging messages Scheduling and transmission of System Information Dynamic allocation of resources to UEs in both UL and DL Configuration and provision of eNB measurements Radio Bearer Control Radio Admission Control Access restrictions in Active state Connection Mobility Control in LTE_ACTIVE state Active mode Handover handling RRC, header compression, encryption, RLC, MAC, PHY Security of User plane and RRC Encryption of both in PDCP, integrity check of RRC Scheduling and associated QoS handling第页RRM Functions (1/3)Inter-Cell Interference Coordination (ICIC):Managing the radio resources (notably the radio resource blocks) such that inter-cell interference is kept under controlLoad Balancing (LB):Influence the traffic load distribution in such a manner that radio resources remain highly utilized and the QoS of in-progress sessions are maintained to the possible extent (may result in handover decisions)Inter-RAT Radio Resource Management:In connection with inter-RAT mobility (taking into account the involved RAT resource situation, UE capabilities operator policies) | 3GPP LTE Technology - Overview| June 2006 RRM Functions (2/3)Connection Mobility Control (CMC):Management of radio resources in connection with idle or active mode Mobility of radio connections: handover decisions based on UE e-NodeB measurements + potentially: neighbour cell load, traffic distribution, transport HW resources operator defined policies Radio Bearer Control (RBC):Establishment, maintenance release of Radio BearersTaking into account overall resource situation, QoS requirement