2020. 3. 22. 18:31ㆍ카테고리 없음
LTE Advanced - Carrier Aggregation - MAC ShareTechnote LTE Advanced - MAC Home: If you are not familiar with details of MAC operation, first refer to. In this page, I will post only those features that is new to Release 10. There is not so much differeces in overal MAC architecture. Even in Carrier Aggregation, still single MAC is used to control/schedule all the carrier components. However, there are a couple of small components newly added to handle the details of new features of LTE Advanced. Followings are the topics to be described in this page.
There is one LCID newly added for Downlink and another one for Uplink. In Rel 10 (The first release with Carrier aggregation) the new LCID for downlink is for 'Activation/Deactivation' and the new LCID for uplink is for 'Extended Power Headroom Report'. As LTE Advanced evolves into higher release, we see more and more new items getting added as shown below. Following tables are based on 36.321-6.2.1. Now let's look into those MAC CEs newly added to LTE Advanced. First refer to to understand general MAC CE. Here I only post the MAC CE that is added only LTE Advanced.
Refer to 36.321 6.1.3.8 Activation/Deactivation MAC Control Element if you want to have formal description. The field structure is as shown below. From Rel 13, UE Category 17 is added.
Based Category 17, we can achieve 32 CC Carrier Aggregation and 25 Gbps. To support 32 CC (31 SCC), a new Activation/Deactivation MAC CE is added as shown below. Now the question is to figure out what does C1, C2, C3 etc mean?
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Does it automatically mean C1 = SCC1, C2 = SCC2 etc? The mapping between C1, C2.,C7 and SCC1,SCC2.,SCC7 is defined in RRC Connection Reconfig message. One example is as follows: (In example, sCellIndex-r10 for SCC1 (the first SCC) is set to be 2. It means C2 field in MAC CE is mapped to SCC1. Therefore, in this case 00000100 means that the first SCC shall be activated. This mean that absolution bit position in MAC CE does not specify whether it is for SCC1 or SCC2 etc. The meaning of each bit in MAC is indicated by RRC message.
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It means what is important is the matching between sCellIndex-r10 and MAC CE bit position. I hope following illustration would sound clearer to you. Following is an example of RRC Connection Reconfiguration message to add SCC1.