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[讨论]在eNodeB侧，每个MAC PDU里面复用的数据都是给一个UE的吗？ (进入论坛模式)
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提问者：chestthinker
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提问时间：2012-6-29 12:09
有没有可能不同UE的数据复用在同一个MAC PDU里面？
问题答案 ( 6 条 )
不可能, 一个MAC PDU只对应一个UE.
肯定不可能哈!~
一个MAC PDU由一个DL-SCH承载，一个DL-SCH对应的DCI由一个CRNTI加扰，所以只能是给一个用户的。
As you can read from the spec., there's no UE IDs in a MAC PDU, in contrast to the LCID subheaders that denote user data from multiple logical channels. It's implying that one MAC PDU can multiplex user data from multiple logical channels but it has no means to multiplex data from different UEs.
In addition if you pay attention to the channel coding process chain, there's only one UE ID (i.e. C-RNTI) to scramble the CRC for a DL DCI, which also implies that the MAC PDU is destined for one UE only.
However, tenically speaking, there's one type of MAC PDU that encapsulates data destined for multiple UEs. It is the MAC PDU that carries RA Responses. The DCI for this type of MAC PDU is scrambled by a shared RA-RNTI. Each of the corresponding UEs only retrieves a section of the MAC PDU (called a RA Response) according to a Preamble ID subheader, discarding the rest of the PDU.
In addition if you pay attention to the channel coding process chain, there's only one UE ID (i.e. C-RNTI) to scramble the CRC for a DL DCI, which also implies that the MAC PDU is destined for one UE only.
However, tenically speaking, there's one type of MAC PDU that encapsulates data destined for multiple UEs. It is the MAC PDU that carries RA Responses. The DCI for this type of MAC PDU is scrambled by a shared RA-RNTI. Each of the corresponding UEs only retrieves a section of the MAC PDU (called a RA Response) according to a Preamble ID subheader, discarding the rest of the PDU.
谢谢，就是说RA Responses里面包含多个UE的接入响应信息？
我觉得你被5#误导出了一个错误的结论 :L
按照5#帖子的描述，SI-RNTI也是UE共享的，难道也包含多个UE的数据吗？只能理解成多个UE可以同时接收这些信息，而不能理解为包含多个UE的数据。
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