5G(NR)网络中为每个终端(UE)调度的资源不仅包括时隙(TS),还有时隙内的符号(OFDM); *4G(LTE)网络中的资源仅是子帧级别的调度。
在5G(NR)网络中通过DCI调度时,终端根据PDSCH中DCI分配的字段值m,按照分配表提供行索引m+1去接收(发送)数据。其索引行定义了为终端(UE)分配的时隙偏移量K0、起始和长度指示符SLIV;也可以直接定义起始符号S和分配长度L及在PDSCH接收中假定的PDSCH映射类型。
一、终端起始分配符号和长度
SLIV(Start and Length Indicator)是网络为终端在PDSCH时域上分配的起始和长度指示。SLIV中还定义了使用Single Number分配PDSCH起始符号和连续的符号数量。通常SLIV中包括两个数量:起始符号S和长度L。
根据TS 38.214 5.1.2.1定义SLIV中为终端分配的起始符号和连续符号数计算公式如下:
1.1 R15版本分配表
根据该公式可创建一个包含可能S和L值的大表格。尽管并非所有组合都被视为有效,允许满足下表中条件的组合均适用;该表在R15中定义如下:
< 38.214-Table 5.1.2.1-1: Valid S and L combinations >
< 38.214-Table 6.1.2.1-1: Valid S and L combinations >
1.2 R16版本分配表
在R16中对起始符号和长度进行了更改,具体见下表:
< 38.214 V16.4.0 -Table 5.1.2.1-1: Valid S and L combinations >
< 38.214 V16.4.0 -Table 6.1.2.1-1: Valid S and L combinations >
二、RRC消息中的SLIV
终端通过上表得到的PDSCH/PUSCH资源是通过RRC消息获悉的,消息内容如下:
PDSCH-TimeDomainResourceAllocation::= SEQUENCE {
k0 INTEGER (1..3)
mappingType ENUMERATED {typeA, typeB},
startSymbolAndLength BIT STRING (SIZE (7)) // SLIV}
PUSCH-TimeDomainResourceAllocation ::= SEQUENCE {
k2 INTEGER(0..7)
mappingType ENUMERATED {typeA, typeB},
startSymbolAndLength BIT STRING (SIZE (7)) // SLIV}
三、 SLIV值查询表
根据 SLIV公式和TS 38.214-Table 5.1.2.1-1,SLIV值可通过下表进行查询。
在表中可以查到唯一的(S, L)对值。
S | L | L-1 | Last | SLIV | Valid Mapping Type | Valid Mapping Type |
0 | 1 | 0 | 0 | 0 | Type B | |
2 | 1 | 1 | 14 | Type B | Type B | |
3 | 2 | 2 | 28 | Type A | Type B | |
4 | 3 | 3 | 42 | Type A,Type B | Type A,Type B | |
5 | 4 | 4 | 56 | Type A | Type A,Type B | |
6 | 5 | 5 | 70 | Type A | Type A,Type B | |
7 | 6 | 6 | 84 | Type A,Type B | Type A,Type B | |
8 | 7 | 7 | 98 | Type A | Type A,Type B | |
9 | 8 | 8 | 97 | Type A | Type A,Type B | |
10 | 9 | 9 | 83 | Type A | Type A,Type B | |
11 | 10 | 10 | 69 | Type A | Type A,Type B | |
12 | 11 | 11 | 55 | Type A | Type A,Type B | |
13 | 12 | 12 | 41 | Type A | Type A,Type B | |
14 | 13 | 13 | 27 | Type A | Type A,Type B | |
1 | 1 | 0 | 1 | 1 | Type B | |
2 | 1 | 2 | 15 | TypeB | Type B | |
3 | 2 | 3 | 29 | Type A | Type B | |
4 | 3 | 4 | 43 | Type A,Type B | Type B | |
5 | 4 | 5 | 57 | Type A | Type B | |
6 | 5 | 6 | 71 | Type A | Type B | |
7 | 6 | 7 | 85 | Type A,Type B | Type B | |
8 | 7 | 8 | 99 | Type A | Type B | |
9 | 8 | 9 | 96 | Type A | Type B | |
10 | 9 | 10 | 82 | Type A | Type B | |
11 | 10 | 11 | 68 | Type A | Type B | |
12 | 11 | 12 | 54 | Type A | Type B | |
13 | 12 | 13 | 40 | Type A | Type B | |
2 | 1 | 0 | 2 | 2 | Type B | |
2 | 1 | 3 | 16 | Type B | Type B | |
3 | 2 | 4 | 30 | Type A | Type B | |
4 | 3 | 5 | 44 | Type A,Type B | Type B | |
5 | 4 | 6 | 58 | Type A | Type B | |
6 | 5 | 7 | 72 | Type A | Type B | |
7 | 6 | 8 | 86 | Type A,Type B | Type B | |
8 | 7 | 9 | 100 | Type A | Type B | |
9 | 8 | 10 | 95 | Type A | Type B | |
10 | 9 | 11 | 81 | Type A | Type B | |
11 | 10 | 12 | 67 | Type A | Type B | |
12 | 11 | 13 | 53 | Type A | Type B | |
3 | 1 | 0 | 3 | 3 | Type B | |
2 | 1 | 4 | 17 | Type B | Type B | |
3 | 2 | 5 | 31 | Type A | Type B | |
4 | 3 | 6 | 45 | Type A,Type B | Type B | |
5 | 4 | 7 | 59 | Type A | Type B | |
6 | 5 | 8 | 73 | Type A | Type B | |
7 | 6 | 9 | 87 | Type A,Type B | Type B | |
8 | 7 | 10 | 101 | Type A | Type B | |
9 | 8 | 11 | 94 | Type A | Type B | |
10 | 9 | 12 | 80 | Type A | Type B | |
11 | 10 | 13 | 66 | Type A | Type B | |
4 | 1 | 0 | 4 | 4 | Type B | |
2 | 1 | 5 | 18 | TypeB | Type B | |
3 | 2 | 6 | 32 | Type B | ||
4 | 3 | 7 | 46 | Type B | Type B | |
5 | 4 | 8 | 60 | Type B | ||
6 | 5 | 9 | 74 | Type B | ||
7 | 6 | 10 | 88 | Type B | Type B | |
8 | 7 | 11 | 102 | Type B | ||
9 | 8 | 12 | 93 | Type B | ||
10 | 9 | 13 | 79 | Type B | ||
5 | 1 | 0 | 5 | 5 | Type B | |
2 | 1 | 6 | 19 | TypeB | Type B | |
3 | 2 | 7 | 33 | Type B | ||
4 | 3 | 8 | 47 | Type B | Type B | |
5 | 4 | 9 | 61 | Type B | ||
6 | 5 | 10 | 75 | Type B | ||
7 | 6 | 11 | 89 | Type B | Type B | |
8 | 7 | 12 | 103 | Type B | ||
9 | 8 | 13 | 92 | Type B | ||
6 | 1 | 0 | 6 | 6 | Type B | |
2 | 1 | 7 | 20 | TypeB | Type B | |
3 | 2 | 8 | 34 | Type B | ||
4 | 3 | 9 | 48 | Type B | Type B | |
5 | 4 | 10 | 62 | Type B | ||
6 | 5 | 11 | 76 | Type B | ||
7 | 6 | 12 | 90 | Type B | Type B | |
8 | 7 | 13 | 104 | Type B | ||
7 | 1 | 0 | 7 | 7 | Type B | |
2 | 1 | 8 | 21 | Type B | Type B | |
3 | 2 | 9 | 35 | Type B | ||
4 | 3 | 10 | 49 | Type B | Type B | |
5 | 4 | 11 | 63 | Type B | ||
6 | 5 | 12 | 77 | Type B | ||
7 | 6 | 13 | 91 | Type B | Type B | |
8 | 1 | 0 | 8 | 8 | Type B | |
2 | 1 | 9 | 22 | Type B | Type B | |
3 | 2 | 10 | 36 | Type B | ||
4 | 3 | 11 | 50 | Type B | Type B | |
5 | 4 | 12 | 64 | Type B | ||
6 | 5 | 13 | 78 | Type B | ||
9 | 1 | 0 | 9 | 9 | Type B | |
2 | 1 | 10 | 23 | Type B | Type B | |
3 | 2 | 11 | 37 | Type B | ||
4 | 3 | 12 | 51 | Type B | Type B | |
5 | 4 | 13 | 65 | Type B | ||
10 | 1 | 0 | 10 | 10 | Type B | |
2 | 1 | 11 | 24 | Type B | Type B | |
3 | 2 | 12 | 38 | Type B | ||
4 | 3 | 13 | 52 | Type B | Type B | |
11 | 1 | 0 | 11 | 11 | Type B | |
2 | 1 | 12 | 25 | Type B | Type B | |
3 | 2 | 13 | 39 | Type B | ||
12 | 1 | 0 | 12 | 12 | Type B | |
2 | 1 | 13 | 26 | Type B | Type B | |
13 | 1 | 0 | 13 | 13 | Type B |
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