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Secondary PDP Contexts
A secondary PDP context is always associated with a primary PDP context. PDP address (IP address) and access point (AP) is re-used from the primary context. Hence the primary and the associated secondary PDP context provide connection to the same PDN with different guaranteed QoS.
One primary PDP context might have multiple secondary contexts assigned. Each PDP context (i.e. the primary and all secondary) has its own RAB and GTP tunnel to transfer user plane data. Also, each context is identified by a unique NSAPI (Network Layer Service Access Point Identifier).
The primary PDP context has to be active prior to activating an associated secondary PDP context. Any secondary PDP context can be deactivated while keeping the associated primary context (and eventual other secondary PDP contexts) active. If a primary PDP context is deactivated, this will also deactivate all the assigned secondary PDP contexts. QoS of any active primary or secondary PDP context can be modified with the PDP context modification procedure initiated by the MS or by the network. (See below for details)
爱楼主,你好,上文中的红色部分,有点不明白,从deactivate pdp context procedure流程里面发现:与多pdp去活相关的好像
只有teardown indicator,让当前的PDP(在request消息里用TI标识)与 所有与当前PDP相关的PDPs都去活,只有让teardown=1即可(gn口的createPDP 里的teardown 是sgsn copy的这个值),那么当前的PDP不一定是primary的啊,好像没有红色部分所说明的功能啊?从teardown可以看出去活PDP的时候,好像不区分primary还是secondary的。
那红色部分所说明的理论,从信令流程里怎么解释呢?
多谢楼主。
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