5A.2.2 Burst Format
25.2213GPPPhysical channels and mapping of transport channels onto physical channels (TDD)Release 17TS
A traffic burst consists of two data symbol fields, a midamble of 144 chips and a guard period. The data fields of the burst are 352 chips long. The corresponding number of symbols depends on the spreading factor, as indicated in table 8A below. The guard period is 16 chip periods long.
The burst format is shown in Figure 18D. The contents of the traffic burst fields is described in table 8B.
Table 8A: number of symbols per data field in a traffic burst
|
Spreading factor (Q) |
Number of symbols (N) per data field in Burst |
|
1 |
352 |
|
2 |
176 |
|
4 |
88 |
|
8 |
44 |
|
16 |
22 |
Table 8B: The contents of the traffic burst format fields
|
Chip number (CN) |
Length of field in chips |
Length of field in symbols |
Contents of field |
|
0-351 |
352 |
cf table 8A |
Data symbols |
|
352-495 |
144 |
– |
Midamble |
|
496-847 |
352 |
cf table 8A |
Data symbols |
|
848-863 |
16 |
– |
Guard period |
Figure 18D: Burst structure of the traffic burst format (GP denotes the guard period and CP the chip periods)