CS域掉话(国外英语资料).docVIP

CS域掉话(国外英语资料) The reasons for dropping messages are: weak coverage, strong interference, handoff failure caused by dropped call (System different system), mobile phone or base station fault caused by dropped calls... Specifically: 1.1 coverage difference TD network coverage index is mainly P-CCPCHs RSCP, C/I. Generally refers to the poor coverage, RSCP is less than 100dBm. To analyze the coverage error problem, we usually consider uplink coverage and downlink coverage. The uplink coverage error or downlink coverage error need to be confirmed by the downlink or uplink or downlink dedicated channel power, and the following methods are needed to confirm: If the upstream drop before transmission power reaches the maximum, and the uplink BLER is poor or from the single user tracking RNC records to see NodeB RL reported by failure, which can be considered to uplink coverage caused by the difference of drop. If dropped before the downlink power reached maximum, and the downlink BLER is very poor, basically can be considered that the downlink coverage does not lead to the drop. In the case of reasonable link balancing, and uplink and downlink without interference, uplink and downlink transmit power will be limited at the same time, it is not necessary to strictly distinguish which party is limited first. If there is a serious imbalance between the uplink and downlink, interference should be preliminarily determined as a limited direction. To confirm the coverage problem, the simple and direct way is to observe the data collected by Scanner directly. If the RSCP and C/I of the cell are very low, it can be considered as a covering problem. Due to the lack of station, take the wrong sector power amplifier fault causes, stand off will cause the poor coverage, in some room, because of the penetration loss will lead to poor coverage, the sector take the wrong or site shut down due to a fault prone in the optimization process, to other areas in the dropping point the coverage is