新版中级培训第二模块之二参数

Combined Configuration
0
7
ts0=bcch/sdcch/4/pch/agch
Separated Configuration
0
7
ts0=bcch/pch/agch ts1=sdcch/8
CHANNEL CONFIGURATIONS Combined CCCH/SDCCH/4 Multiframe
s = SCH/SACCH c = CCCH = PCH/AGCH
i=idle
CHANNEL CONFIGURATIONS Full Rate Traffic Channel (TCH) Multiframe
Downlink and Uplink
26 TDMA frames = 120 ms
t t t t t t t t t t t t sf t t t t t t t t t tf t t i
3 Traffic Channels
• TCH/F, TACH
4 Parameters
CHANNEL CONFIGURATIONS Time Slots and Frames
Hyperframe = 2048 Superframes
Superframe = 26x51 or 51x26 Multiframes
0
25
CHANNELS t = TCH s = SACCH i=idle
CHANNEL CONFIGURATIONS SDCCH Capacity
SDCCH used in • Call setup • Location updates • Short Message Service • imsi attached/detached
CHANNEL CONFIGURATIONS Logical Channels, Downlink
BSS -> MS
COMMON CHANNELS
FCCH
BCH
SCH
BCCH
CCCH
PCH AGCH
DEDICATED CHANNELS
DCCH
SDCCH SACCH FACCH
TCH TCH
TCH
CHANNEL CONFIGURATIONS Logical Channels, Uplink
MS -> BSS
COMMON CHANNELS
CCCH
RACH
DEDICATED CHANNELS
DCCH
SDCCH SACCH FACCH
TCH TCH
TCH
FCCH频率校正信道：给ＭＳ提供一个标志，使它们在若干ＴＲＸ之间发现包含广播传输的ＴＲＸ， 移动台开机后，搜寻这个信号．
SCH同步信道:包含基站识别码BSIC和简化的TDMA帧号.BSIC用于识别不同的小区,TDMA帧号用于话 间加密.
Uplink
r r r r r r r r r r r r rf r r r r r r r r r rf r r r r r r r r r rf r r r r r r r r r rf r r r r r r r r
0
50
CHANNELS f = FCCH b = BCCH r = RACH i=idle
– => 325 Calls / Cell * 1,94 mErl / Call = 0,6305 Erl / Cell (SDCCH)
Call Establishment and Location Update together
– 0,632 Erl + 0,632 Erl = 1,261 Erl / Cell – With 1% Blocking Probability ( Erlang B table ) => 5 SDCCH / Cell
2% 0 .0 2 0 .2 2 0 .6 0 1 .0 9 1 .6 6 2 .2 8 2 .9 4 3 .6 3 4 .3 4 5 .0 8 5 .8 4 6 .6 1 7 .4 0 8 .2 0 9 .0 1 9 .8 3 1 0 .7 0 1 1 .5 0 1 2 .3 0 1 3 .2 0
Downlink
51 TDMA frames = 235 ms
f s b b b b c c c c f s cf c c c c c c c f s tf t t t t t t t f s tf t t t t t t t f s sf s s s s s s s i
Uplink
1.
2.
3.
4.
中
级
培
训
第
二 模
参数
块
之
二
课程时间
08:15 12:45 15:00 17:30
开始 结束 开始 结束
约二天时间。
CHANNEL CONFIGURATIONS Contents
1 TDMA frame • Time Slots • Burst
2 Signaling Channels • Logical Channels • BCCH/CCCH • SDCCH/8, SDCCH/4, CBCH ( 2nd phase GSM )
TCH 26 Multiframe = 120 ms
012
24 25
51 Multiframe = 235 ms
012
49 50
SIGN.
0
7
TDMA frame = 4.615 ms
CHANNEL CONFIGURATIONS Burst Period
00
0
70
f
s
TDMA frame = 4.615 ms = BURST PERIOD
BCCH广播控制信道:包含了详细的网络和小区信息, 如:服务区和邻小区的频率. 跳频序列,信道 组合方式,COMBINE 等; 寻呼组,通常一个小区有多个寻呼信道,为了防止移动台为了一个寻呼消 息而侦听所有的寻呼信道,寻呼信道以只有某一组移动台侦听某一特定的寻呼信道的方式分开;邻 小区信息,MS必须知道目前小区的邻区是什么,以及它们广播频率.
PCH寻呼信道:下行,寻呼用户时用,它是由位置区的所有BTS广播的. RACH随机接入信道:CCCH中唯一的上行链路.用于MS启动一事务,主叫,或作为PCH的应答. AGCH准许接入信道;为MS指派一个SDCCH,是下行的. SDCCH独立专用控制信道,用于呼叫建立,鉴权,位置更新,TCH分配,短消息. SACCH慢随路控制信道:SACCH伴随着SDCCH和TCH,用于发送测量报告,功率控制,时间校准,MS通话
CHANNEL CONFIGURATIONS SDCCH Capacity (a)
Example (Call establishment and Location Update included)
– Call Establishment
2 TRXs / Cell ~ 8,11 Erl / Cell (1% Blocking probability) 1,5 min / Subs / BH = 25 mErl. / Subs 8,11 Erl / Cell /25 mErl. / Subs = 325 Subs / Cell Authentication and Ciphering = 7 sec = 1,94 mErl / Call (SDCCH reservation time)
– => 325 Calls / Cell * 1,94 mErl / Call = 0,6305 Erl / Cell (SDCCH) – Location Update
Location Updates once in 60 minutes ( parameter timerPeriodicUpdateMS ) 325 Subs / Cell SDCCH reservation time for Location Update = 7 sec = 1,94 mErl
BCCH/SDCCH/4
1
23
f s b b b b c c c c f s cf c c c c c c c f s tf t t t t t t t f s tf t t t t t t t f s sf s s s s s s s i
CHANNELS f = FCCH
b = BCCH t = SDCCH/4
Combined BCCH/SDCCH channel structure is not possible in this case !
Separate Configuration (1 BCCH/CCCH and 1 SDCCH/8) is needed!
CHANNEL CONFIGURATIONS Erlang B Table
CHANNEL CONFIGURATIONS BCCH/CCCH Multiframe
Downlink
51 TDMA frames = 235 ms
f s b b b b c c c c f s cf c c c c c c c f s cf c c c c c c c f s cf c c c c c c c f s cf c c c c c c c i
时发送短信. FACCH快随路控制信道:用于切换时,它与一个TCH对应,代替20MS的话间,工作于偷帧模式. TCH业务信道:传送话音与数据,TCHF是全速13.3Kbit/s,TCHH是半速率5.6, EFR增加型全速率
,13.3,但编码方式与全速率不同,在话音质量上有更一步提高.
CHANNEL CONFIGURATIONS Configuration of Signalling Channels
1. 2.
3.
4.
5.
6. 7.
8.
Uplink
s s s s s s s s s s s s fi i i t t t t t t t tf t t t t t t t t t tf t t t t t t t t t tf t t t t t t t t
0
50
CHANNELS t = SDCCH/8 s = SACCH/8 i=idle
s = SCH
c = CCCH = PCH/AGCH
CHANNEL CONFIGURATIONS SDCCH/8 Multiframe
Downlink
51 TDMA frames = 235 ms
t t t t t t t t t t t t tf t t t t t t t t t tf t t t t t t t t t sf s s s s s s s s s sf s s s s s i i i
0
25
CHANNELS t = TCH s = SACCH i=idle
CHANNEL CONFIGURATIONS Half Rate Traffic Channel (TCH) Multiframe
Dframes = 120 ms
t t t t t t t t t t t t st t t tt t t t t t tt i t t t t t t t t t t t t t t t t t t t t t t tt t t
t t t t r r s s s s s s sf s r r r r r r r r rf r r r r r r r r r rf r r r r t t t t t tf t t r r t t t t
0
50
CHANNELS f = FCCH
b = BCCH r = RACH i=idle
s = SCH/SACCH c = CCCH t = SDCCH/4
Chs 1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17 18 19 20
1% 0 .0 1 0 .1 5 0 .4 6 0 .8 7 1 .3 6 1 .9 1 2 .5 0 3 .1 3 3 .7 8 4 .4 6 5 .1 6 5 .8 8 6 .6 1 7 .3 5 8 .1 1 8 .8 8 9 .6 5 1 0 .4 0 1 1 .2 0 1 2 .0 0
CHANNEL CONFIGURATION Number of Blocks for AGCH only
BCCH/CCCH 1
51 TDMA frames = 235 ms
2
3
45
67
8
9
f s b b b b c c c c f s cf c c c c c c c f s cf c c c c c c c f s cf c c c c c c c f s cf c c c c c c c i