朗讯1xEV-DO技术体系(贝尔lab)

朗讯1xEV-DO技术体系(贝尔lab)1xEV-DO 技术体系介绍

张文涛，朗讯（中国）科技有限公司，贝尔 实验室
1

内容概要

l 技术点分析 l ＩＯＳ　呼叫流程 l 总结

２

1xEV-DO 信道结构
1xEV-DO

Forward

Reverse

Pilot

MAC

Traffic

Control

Traffic

Access

Pilot
Reverse Activity Bit

MAC

Data

Ack Pilot Data
３

Reverse Power Control (RPC)

DRC Lock

Reverse Rate Indicator (RRI)

Data Rate Control(DRC)

前向链路帧／时隙结构
System time
Frame = 26.67 ms 1/2 frame = 13.33 ms 4 slot = 6.66 ms 2 slot = 3.33 ms 1 slot = 1.667 ms
2 Slots 4 Slots 8 Slots

16 Slots

0

1 5

2

3

4

5 5

6 1 Slot

7

8

9 5

10

11

12

13 5

14

15

Active Slot
Data 400 chips Pilot 64 96 chips Data 400 chips Data 400 chips Pilot 64 96 chips Data 400 chips

64

64

RPC/DRC Lock RPC/DRC Lock RAB RAB

RPC/DRC Lock RPC/DRC Lock RAB RAB

1024 chips = half slot

1024 chips = half slot

Pilot 64 96 chips
RPC/DRC Lock