1...omf000001 um interface and radio channels issue2.1

8/14/2019 1...OMF000001 Um Interface and Radio Channels ISSUE2.1

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Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.

Um Interface andRadio Channels


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Page2Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.

Contents

Overview

Processing of Voice Signal

Radio Channel


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Radio Interface

Ano ther M SC

HL R/AUCSMC

PSTNISD N

OMC

MS

UmMS

A-bisBSC

A

BT S

MSC/VL R


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Communication management (CM)

Radio resources management (RR)

Mobility and security management

(MM)

Integrated management

TCH0 TC H1 TC H2 SACCH TCH23 I DLMul tif r ame

Ph ysi cal l i nk layer ( L1)

Data l ink layer ( L2)

Networ k appl icati on l ayer ( L3)

Hierarchical Structure of UmInterface

RAC H BC CH AG CH/PC H SD CC H SA CC H TC H FA CC H


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Radio Access TechnologyTim e

FDMA

Frequency

TDM Aime

Frequency

CDM A

Freq uen cy

Time

Code


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Radio Access Technology

Time FDM A

Freq uen cy

TDM Aim e

Freque ncy

CDM A

Frequency

Time

Cod e


7/40Page7Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.

Contents

Overview


Radio Channel


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Voice A/D 8KHz 13bi t Speechco din gSegmenta t ion

20m s13kb it/s Chann elcodi ng

Inter leavi ng Burstfor matt ingncr yptio n

22.8k bi t /s

Modul ati on33.8kbi t /s

Transm issi on

Voice Signal Processing


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Speech Coding

The coding mode is called Regular Pulse Excited-

Long Term Prediction (RPE-LTP).

It works as follow: 8KHZ of sampling is performed

first, then divided into frames with 20ms; every

frame has 4 sub-frames; the duration of every sub-

frame is 5ms; and the pure bit rate is 13kbit/s.


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Blockco derExcite dcode r

50 bit

+3 *2+4

13 2bit

78 bit

456b it

Channel Coding


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1 2 3 4 5 6 7 8 ... ... 45 2 4 53 454 45 5 456B

816...

456

210...

450

614...

454

19...

449

412...

452

715...

455

311...

451

513...

453. . . . . . . .

B0 B1 B2 B3 B4 B5 B6 B7

{A4,B0 } {A5,B1} {A6,B2 } {A7 ,B3 } { B4 ,C0 } {B5 ,C1 } {B6,C2 } {B7,C3 }

Fir st inte rlea ving :

Sec ond inte r le avin g:

Interleaving


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3 57 1 26 1 57 3

Voice Burst


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Tran smis sion de lay t

Tran smis sion de lay t

TA

Th e mo bi le p hone sh oul dsend t he sig nal i n advan ce!!

Timing Advance (TA)


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Timing Advance (TA)

Tran smis sion de lay tTran smis sion de lay t

TA

Th e mo bi le phone sh oul dsend t he sig nal in a dvanc e!!


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Frequency Hopping

Frequency

f 0

Frame

f 1

f 2

f 3

f 4

Time


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Frequency Hopping

Frequency

f 0

Frame

f 1

f 2

f 3

f 4

Time


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Prolong battery life andreduce interference

DTX

DTX: Discontinuous Transmission

Shut off the transmission at voice intervals;

Only transmit SID frames

The transcoder at the RX terminal produces comfortablenoise.

VAD: Voice Activity Detection

Implemented by the transcoder.


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DTX

DTX: Discontinuous Transmission

Shut off the transmission at voice intervals;

Only transmit SID frames

The transcoder at the RX terminal produces comfortablenoise.

VAD: Voice Activity Detection

Implemented by the transcoder.

Prolong battery life and

reduce interference


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Power Control

Prolong battery life Reduce network interference

Include both uplink power control and downlink power

control

Level and quality are taken into account

BSC or BTS is the final adjudicator

BCC H Car rier is notinv olv ed in pow ercont rol.Time

Signal level

Ta rget le vel val ue:e.g. - 85 dm


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Contents

Overview


Radio Channel


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Frequency

200kHz

15/26ms

BPSlit

Time

Frame and Channel


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32107654321

Definition of Logical Channel

0

different

message

types

Logicalchannel

Physical Channel

Logicalchannel

Logical

channel

LogicalchannelLogicalchannel

TDMA FRAME

200K

577 s


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8bit 41 synchronousbits

36 encrypted

bits3bit 68.25bit

Tail bit Tail bitGuard interval

Data

Access burst (AB): Used in MS initial access

Guard interval

3bit 142bit 3bit 8.25bit

Tail bit Tail bitData

Frequency correction burst (FB): Used in frequency synchronizationbetween MS and BTS

3bit 39 encryptedbits

39 encrypted

bits3bit 8.25bit

Tail bit Tail bit Guard intervalDataData

Synchronous burst (SB): Used in timing synchronization between MS

and BTS

Burst

64 synchronous bits


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3bit 142 modulation bits 3bit 8.25bit

Tail bit Tail bit Guard interval

Dummy burst (DB): Used in transmission of filling frames byBTS at timeslots when there is no information delivered

Burst

3bit 57 encrypted bits 57 encrypted bits 3bit 8.25bit

Tail bit Tail bit Guard intervalDataData

26bit1 1

Training sequence

Frame

stealing

flag

Normal burst (NB): Used to carry the information of the traffic channel and

the control channel except for RACH


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Broadcast c ontro l channel(BCH) Contro l channel

ommon contro l channel(CCCH)

Voice channel(TCH)

FCC H SCH BCCH(system in format ion) TCH/FGCH RA CH SDCC H FACCH

SACCH

TCH/HPCH

Com mo n c ha nne l(CCH)

De dic ate d c han ne l(DCH)

Lo gic al c han ne l

Logical Channel Type

GSM900 and DCS1800 have the same logical channel

category


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FCCH

SCH

BCCH

PCH

AGCH

BCCH

CCCH

Common

Channel

SDCCH

SACCH

FACCH

TCH/F

TCH/H

DCCH

TCH

Dedicated

Channel

Downlink Logical Channel


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RACH CCCH

Common

channel

SDCCH

SACCH

FACCH

TCH/F

TCH/H

DCCH

TCH

Dedicated

channel

Uplink Logical Channel


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Uplink Logical Channel

RACH CCCH

Common

channel

SDCCH

SACCH

FACCH

TCH/F

TCH/H

DCCH

TCH

Dedicated

channel


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Use of Logical Channels

FCCH

Allocate signaling channel

Power-on Search for frequency correction burst

Search for synchronous burst

Listen to the system information

Monitor paging message

Send access burst

Set up the call

Allocate voice channel

ConversationRelease the call

Idle mode

SCH

BCCH

PCH

RACH

AGCH

SDCCH

SDCCH

TCHFACCH

Dedicated mode

Idle mode


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26-frame multi-frame

TCH/F+SACCH/F (full-rate TCH)

TCH/H+SACCH/H (half-rate TCH)

51-frames multi-frame

FCCH+SCH+BCCH+CCCH (main BCCH)

FCCH+SCH+BCCH+CCCH+SDCCH/4+SACCH/4 (combined BCCH)

BCCH+CCCH (extended BCCH)

SDCCH/8+SACCH/8 (main SDCCH)

Physical Combination of LogicalChannel


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Structure of Main BCCH

50

46-

49

42-

45

4

1

4

020-39

16-

19

12-

15

1

1106-92-510

Frame

Number

ICX4CX4SFCX4CX4SFCX4BX4SFChannel

Grpup5

Group3,

4

(same

as

Group2)

Group2Group1Group

1 multi-frame (51TDMA Frames) 235.38ms Downlink

5

0

4

9

4

84713-461211109876543210

Frame

Numbe

r

RRRRRRRRRRRRRRRRRRChanne

l

1 multi-frame (51TDMA Frames) 235.38ms Uplink

F:FCCH; S:SCH; B:BCCH; C:CCCH; R:RACH; I:IDLE


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Structure of Logical ChannelCombination Frame-TCH

T:TCH;A:SACCH; I:IDLE

2524232221201913

1812

6

11543210

Frame

Number

ITTTTTTT,,,TATTTTTTTTChannel

1 multi-frame (26TDMA Frames) 120ms


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0 1 2 3 2044 2045 2046 2047

0 1 2 3 48 49 5047

0 1 24 25

0 1 24 25 1 49 500

0 1 4 5 762 3

TB

3

TB

3

GP

8.25TB: Tail bitTB

3TB3

GP8.25

GP: Guard periodTB3

TB3

GP8.25

TB3

TB3

GP 68.25

58 information bits26 training

sequences58 information bits

Constant bit 142

Information bit 39 Extended training sequence 64 Information bit 39

Synchronous sequence 41 Information bit 36

Normal burst (NB)

Frequency correction burst (FB)

Synchronous burst (SB)

Access burst (AB)

1 hyper frame=2048 super-frames=2715648TDMA frames (3 hours, 28 minutes, 53 seconds and 760 milliseconds)

1 super-frame=1326TDMA frames (6.12 seconds)

1 multiframe=26TDMA frames (120ms) 1 multiframe=51TDMA frames (3060/13ms)

1TDMA frame=8 timeslots (120/26=4.615ms)

1 timeslot=156.25 bit duration (15/26=0.577ms)(1 bit duration: 48/13=3.68us)

BCCHCCCHSDCCH

TCHSACCH/TFACCH

Frame


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0 1 2 3 2044 2045 2046 2047

0 1 2 3 48 49 5047

0 1 24 25

0 1 24 25 1 49 500

0 1 4 5 762 3

TB

3

TB

3

GP

8.25

TB: Tail bitTB3

TB3

GP8.25

GP: Guard periodTB3

TB3

GP8.25

TB3

TB3

GP 68.25

58 information bits

26 training

sequences 58 information bits

Constant bit 142

Information bit 39Extended training

sequence 64 Information bit 39

Synchronous sequence 41 Information bit 36

Normal burst (NB)

Frequency correction burst (FB)

Synchronous burst (SB)

Access burst (AB)

1 hyper frame=2048 super-frames=2715648TDMA frames (3 hours, 28 minutes, 53 seconds and 760 milliseconds)

1 super-frame=1326TDMA frames (6.12 seconds)

1 multiframe=26TDMA frames (120ms) 1 multiframe=51TDMA frames (3060/13ms)

1TDMA frame=8 timeslots (120/26=4.615ms)

1 timeslot=156.25 bit duration (15/26=0.577ms)(1 bit duration: 48/13=3.68us)

BCCHCCCHSDCCH

TCH

SACCH/TFACCH

Frame


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1...omf000001 um interface and radio channels issue2.1

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