传输格式基本概念，以及传输格式选择

lentil

TB TB size 一个TBS中的每个TB大小一样
TBS TBS size   TBS size/TB size = the number of the TB  
    TTI MAC层每TTI时间传输一个TBS给物理层
    TF:This is defined as a format offered by L1 to MAC (and vice versa) for the delivery of a Transport Block Set during a Transmission Time Interval on a Transport Channel.
Attributes of the dynamic part are:
- Transport Block Size;
- Transport Block Set Size;
- Transmission Time Interval (optional dynamic attribute for TDD only);
Attributes of the semi-static part are:
- Transmission Time Interval (mandatory for FDD, optional for the dynamic part of TDD NRT bearers);
- error protection scheme to apply:
- type of error protection, turbo code, convolutional code or no channel coding (TDD only);
- coding rate;
- static rate matching parameter;
- size of CRC.
EXAMPLE:
Dynamic part: {320 bits, 640 bits}, Semi-static part: {10ms, convolutional coding only, static rate matching parameter = 1}.
TFS:This is defined as the set of Transport Formats associated to a Transport Channel.
The semi-static parts of all Transport Formats are the same within a Transport Format Set.
the dynamic parts of the corresponding Transport Format Sets only include variable Transport Block Set Sizes.
both the Transport Block Size and the Transport Block Set Size
Example 1:
- dynamic part: {20 bits, 20 bits}; {40 bits, 40 bits}; {80 bits, 80 bits}; {160 bits, 160 bits}.
- Semi-static part: {10ms, Convolutional coding only, static rate matching parameter = 1}
Example 2:
- dynamic part: {320 bits, 320 bits}; {320 bits, 640 bits}; {320 bits, 1 280 bits}.
- Semi-static part: {10ms, Convolutional coding only, static rate matching parameter = 2}.
    TFC:
EXAMPLE:
DCH1:
Dynamic part: {20 bits, 20 bits}, Semi-static part: {10ms, Convolutional coding only, static rate matching parameter = 2};
DCH2:
Dynamic part: {320 bits, 1280 bits}, Semi-static part: {10ms, Convolutional coding only, static rate matching parameter = 3};
DCH3:
Dynamic part: {320 bits, 320 bits}, Semi-static part: {40ms, Turbo coding, static rate matching parameter = 2}.
     
    TFCS:The Transport Format Combination Set is what is given to MAC for control. However, the assignment of the Transport Format Combination Set is done by L3.
- dynamic part:
- combination 1: DCH1: {20 bits, 20 bits}, DCH2: {320 bits, 1280 bits}, DCH3: {320 bits, 320 bits};
- combination 2: DCH1: {40 bits, 40 bits}, DCH2: {320 bits, 1280 bits}, DCH3: {320 bits, 320 bits};
- combination 3: DCH1: {160 bits, 160 bits}, DCH2: {320 bits, 320 bits}, DCH3: {320 bits, 320 bits}
- semi-static part:
- DCH1: {10ms, Convolutional coding only, static rate matching parameter = 1};
- DCH2: {10ms, Convolutional coding only, static rate matching parameter = 1};
- DCH3: {40ms, Turbo coding, static rate matching parameter = 2}.

MAC 从TFCS中选择TFC
TFI：标识一个TF， MAC－Transport channel－L1
TFCI：代表当前的TFC，用于通知接收方当前有效的TFC
每个Transport Channel的每次TBS的传输中，MAC向L1指示TFI，L1有该UE的所有并行transport channel的TFIs中构建TFCI，然后把TFCI添加到物理控制信令中。
通过对TFCI的检测，接收方能够识别TFC

从TFCS中选择TFC的原则
The chosen TFC shall be selected from within the set of valid TFCs and shall satisfy the following criteria in the order in which they are listed below:
1. No other TFC shall allow the transmission of more highest priority data than the chosen TFC.
2. No other TFC shall allow the transmission of more data from the next lower priority logical channels. Apply this criterion recursively for the remaining priority levels.
3. No other TFC shall have a lower bit rate than the chosen TFC.
RNC-->NodeB-->UE(RB Setup)消息中带有TFCI，接收方可以根据TFCI识别出TFC。TFS中的RLC size 使得UE知道有哪些AMR速率可以用