为什么在BSC把小区的数据全部删掉，SGSN上还是有原小区的CI-BVCI

张沿

为什么在BSC把小区的数据全部删掉，SGSN上还是有原小区的CI-BVCI。BSC小区GPRS状态不是应该与SGSN自动同步吗？现在发现很多SGSN BL的小区在BSC都是没有任何数据的，有些小区甚至在SGSN上为wo状态，而在BSC上没有任何数据，不知为什么会这样？

张沿

回复 cmcc_demon 的帖子

请问这个周期是多少呢？SGSN小区为WO，BSC为BL的状态从发现到现在已经好几周了。

张沿

回复 cmcc_demon 的帖子

请问这个周期是多少呢？SGSN小区为WO，BSC为BL的状态从发现到现在已经好几周了。

张沿

3GPP TS 48.018

8.3 BVC blocking and unblocking procedure
   When a BSS wishes to block a BVC, the BSS shall mark that BVC as blocked, thereafter discarding any traffic sent to  the BVC in the uplink direction. The cell associated with the BVC should not accept data in the downlink direction. The  BSS shall send a BVC-BLOCK PDU to the SGSN and start timer T1.
   If a BVC-BLOCK-ACK PDU is not received for a BVC-BLOCK PDU within T1 seconds, then the BVC-BLOCK PDU procedure shall  be repeated a maximum of BVC-BLOCK-RETRIES attempts. After BVC-BLOCK-RETRIES attempts the BVC remains blocked, the  procedure is stopped and the O&M system is informed.

8.4.3 Abnormal Conditions
    If the BSS receives a BVC-RESET PDU for a BVCI which is unknown in the BSS, then the BSS shall return a STATUS PDU  towards the SGSN including the BVCI and the cause value 'BVCI unknown'.

张沿

个人理解：
BSC删小区数据的时候是告诉SGSN的，但由于各种原因T1超时，当SGSN再 发起RESET的时候BSC BVCI已不存在，BSS回应'BVCI unknown'，但SGSN上数据不能删除掉。