7、网优_CDMA消息.ppt

CDMA移动通信系统RF优化培训讲义-深化专题:Message
C网网优储备项目组
保密材料
Handoff
Sync Channel
Paging Channel
Call Setup & Response
Registration
内容
Ⅰ. Sync Channel
Traffic is terminated
Initialization State
Pilot Detection
Release order
Sync
Paging
Searching
(Acquired Pilot)
Sync Channel
Provide essential system parameters
Initial time synchronization
Mobile re-syncs at the end of every call
Channel structure
Bit rate : 1200bps
Searching
All PN Offsets
Rake Fingers
Œ

Ž
Reference PN
Active Pilot
Ec/Io
0
0
32K
512
Chips
PN
1. Pilot Searcher Scans the Entire Range of PNs
0
-20
98/05/24 23:14: [SCH]
Sync Channel Message
MSG_LENGTH = 208 bits
MSG_TYPE = Sync Channel Message
P_REV = 3
MIN_P_REV = 2
SID = 179
NID = 0
PILOT_PN = 168
Offset Index
LC_STATE = 0x0348D60E013
SYS_TIME = 98/05/24 23:14:
LP_SEC = 12
LTM_OFF = -300 minutes
DAYLT = 0
PRAT = 9600 bps
RESERVED = 1
2. Put Rake finger(s) on strongest
available PN, decode Walsh 32,
and read Sync Channel Message
SYNC CHANNEL MESSAGE
Handset
Rake Receiver
RF
»
x
»
LO
Srch PN??? W0
F1 PN168 W32
F2 PN168 W32
F3 PN168 W32
Sync channel message
SYNC CHANNEL -- Sync Channel Msg
protocol_rev = 6
chan_type = 0 (Sync)
chan
sc_msg
gen
msg_type = 1 (Sync)
sync
p_rev = 6 版本情况
min_p_rev = 1
sid = 2236 (0x8bc)
nid = 113 (0x71)
pilot_pn = 188 (0xbc)导频
lc_state[HI] = 507
lc_state[LO] = 3582174253
sys_time[HI] = 1
sys_time[LO] = 4022462865
lp_sec = 13
ltm_off = 18
daylt = 1
prat = 0 寻呼信道速率9600
cdma_freq = 29 (0x1d)
ext_cdma_freq = 29 (0x1d)
This message is transmitted for time sync. And by this message, the mobile station knows the frequency to sync
Protocol revision level used by the system
1:IS95, 2:IS95A, 3:TSB74, 4,5:IS95B, 6:IS95C
The prat means the paging rate of the paging channel
0 : 9600bps , 1 : 4800bps
Ⅱ. Paging Channel
B
T
S
M
S
System parameter message
Extended system parameter message
CDMA channel list
Extended Channel list message
Access par