已关闭问题
MAC问题 UL和DL-SCH data transfer部分
提问者:kkdr
|
提问时间:2013-1-23 19:10
MAC36321协议,UL和DL-SCH data transfer部分
看得有点迷糊。。。
麻烦达人们帮解答下面的几个问题吧,其实,说白了,可能就是一个问题。
先谢谢啦!!!
5.3 DL-SCH data transfer
1.
- if a downlink assignment for this TTI has been received on the PDCCH for the UE’s C-RNTI, or Temporary C-RNTI:
- else, if a downlink assignment for this TTI has been received on the PDCCH for the UE’s Semi-Persistent Scheduling C-RNTI:
- else, if a downlink assignment for this TTI has been configured and there is no measurement gap in this TTI and this TTI is not an MBSFN subframe:
第一个if应该是动态高度吧,第二个是SPS,第三个呢?received和configured有什么不同呀?configured是指的Semi-Persistent Scheduling吗?
2. For configured downlink assignments, the HARQ Process ID associated with this TTI is derived from the following equation:
configured downlink assignments是指的Semi-Persistent Scheduling吗?
if the downlink assignment is for UE’s C-RNTI and if the previous downlink assignment indicated to the HARQ entity of the same HARQ process was either a downlink assignment received for the UE’s
Semi-Persistent Scheduling C-RNTI or a configured downlink assignment:
从上面的协议来看,configured downlink assignments和Semi-Persistent Scheduling应该不一样,区别是什么呢?
3. 动态调度时,需要每个TTI都得从eNodeb获得assignment吗?是不是assignment有个duration呢?
4. SPS时,需要从eNodeb获得assignment吗?流程与动态调度的区别是?
5. 从NDI怎么来判断是新传还是重传?TD中,这个值的取值是010101...值相同时认为是重传。
6. consider the NDI bit to have been toggled。这句话会意思,数据重传?
SPS 调度不光在开始和结束时有DL ASSIGNMENT。 可能在中间也会有新的DL assignment修改周期,tbs,prb.... 而且SPS也支撑自动结束机制,即连续几次没有收到data后,自动认为SPS调度结束,当然需要High layer提前配置
回答时间:2013-3-16 16:16
热点问题