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| 型号： | TPTDSCDMAWP |
| 英文描述： | Spatial Temporal Processing in TD-SCDMA |
| 中文描述： | 时间空间处理在TD - SCDMA |
| 文件页数： | 21/23页 |
| 文件大小： | 415K |
| 代理商： | TPTDSCDMAWP |
Spatial Temporal Processing in TD-SCDMA
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7
2.
Signal Model
2.1.
TDD/TDMA
Internet based applications, media (audio and video) enabled applications and
file transfers have very different bandwidth requirements for uplink and downlink
traffic. TD-SCDMA does not dictate a fixed utilization of the frequency band;
rather uplink and downlink resources are assigned according to traffic needs.
Symmetric
Traffic
Asymmetric
Traffic
UL
DL
Figure 2-1 Symmetric and Asymmetric traffic support in TD-SCDMA
The variable allocation of the time slots for uplink or downlink traffic is what
allows TD-SCDMA to efficiently support asymmetric traffic requirements and a
variety of users. Figure 2-1 illustrates this principle where for symmetric traffic,
the time slots are equally split and for asymmetric traffic the DL can use more
time slots.
2.2.
TD-SCDMA Frame Hierarchy
TD-SCDMA uses both unique codes and time signatures to separate the users in
a given cell. The standard defines a very specific frame structure as shown in
Figure 2-2. There are three different layers: the radio frame, the sub-frame and
the individual time slots. Depending on the resource allocation, the configuration
of the radio frames becomes different. The radio frame is 10ms; the sub-frame is
5 ms in length and is divided into 7 slots. The standard also specifies various
ratios for the number of slots between these two groups in order to meet specific
traffic requirements. All physical channels require a guard symbol in every time
slot.
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