BSS PFC定义及流程（含简单实例）

johnwey

如果SGSN在create PDP context request时已和GGSN协商成功384kbps/64kbps, 通过什么方式把现在已经降级的Qos通知到GGSN？

johnwey

应该激活后就又有一个modify PDP context的过程

johnwey

Sorry，规范里标准PDP激活流程就提到了

9.2.2.1
PDP Context Activation Procedure

7)
In A/Gbmode, BSS packet flow context procedures may be executed. These procedures aredefined in clause "BSS Context".

8)
In casethe QoS attributes, used as input to step 5 for Iu mode or step 7 forA/Gb mode, have been downgraded during those steps, the SGSN may inform theGGSN about the downgraded QoS attributes by sending an Update PDP ContextRequest to the affected GGSN. The GGSN shall not attempt to renegotiate the QoSattributes. The No QoS negotiation indication is set in Update PDP ContextRequest to indicate to the GGSN that the SGSN does not upgrade the previouslynegotiated QoS attributes and that the GGSN shall accept the provided QoSattributes without negotiation. The GGSN confirms the new QoS attributes bysending an Update PDP Context Response to the SGSN. If the SGSN establishedDirect Tunnel in step 5 it shall send Update PDP Context Request andinclude the RNC's Address for User Plane, TEID for downlink data, No QoSnegotiation indication and the DTI. DTI is used to instruct the GGSN to applyDirect Tunnel specific error handling as described in clause 13.8. TheGGSN(s) shall not include a PCO in the Update PDP Context Response if the NoQoS negotiation indication is set.