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已解决问题
查了查协议，摘录了几段如下。注意我标注的红色字体，应该是取决于UE的实现，两种方法都可以，显然通过同一条RRC连接发送的效率更高，但UE必须遵守协议制定的规则。
If an entity has morethan one short message or notification to send, then it is useful to maintainthe Radio Resource (RR) connection (in A/Gb mode) or the signalling connection(in Iu mode) in between transfers. ......
If another short message or a memoryavailable notification is to be sent, an originating SMR entity in the MS may choose to continue to use the same RR connection (in A/Gb mode) or the signallingconnection (in Iu mode).
......（这里描述UE如何在同一个RR或信令连接上发送多条短消息，比较长，省略。有兴趣者自查协议。）
When an MS sendssuccessive memory available notifications and/or mobile originated shortmessages on different RR connections (in A/Gb mode) or signalling connections(in Iu mode), the MS is strongly recommended to use different TransactionIdentifiers for the old and new MM connections.
...
If an entity has morethan one short message or notification to send, then it is useful to maintainthe Radio Resource (RR) connection (in A/Gb mode) or the signalling connection(in Iu mode) in between transfers. ......
If another short message or a memoryavailable notification is to be sent, an originating SMR entity in the MS may choose to continue to use the same RR connection (in A/Gb mode) or the signallingconnection (in Iu mode).
......（这里描述UE如何在同一个RR或信令连接上发送多条短消息，比较长，省略。有兴趣者自查协议。）
When an MS sendssuccessive memory available notifications and/or mobile originated shortmessages on different RR connections (in A/Gb mode) or signalling connections(in Iu mode), the MS is strongly recommended to use different TransactionIdentifiers for the old and new MM connections.
...
回答时间：2012-4-25 17:53
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