1.Oma310000 Gsm Radio Interface Issue2

7/31/2019 1.Oma310000 Gsm Radio Interface Issue2

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OMA310000 GSM BSS 2.21

Developer/Modifier Time Approver New/Update

Luo Ying 2010.06 Update

Zhou Quanxin 2011.02 Luoying Debug

Qin Hu 2011.03 Debug

Copyright 2011 Huawei Technologies Co., Ltd. All rights reserved. Page0


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Um Interface anda o anne s

www.huawei.com

Copyright 2011 Huawei Technologies Co., Ltd. All rights reserved.


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.

2. Processing of Voice Signal

3. Radio Channel



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Another MSC

PSTN

ISDNBTS

MS A-bis

BSC

A MSC/VLR

HLR/AUC

SMCOMC

Um

MS



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Mobility and security management

(MM)

Mobility and security management

(MM)

Network application layer (L3)

Radio resources management (RR)Radio resources management (RR)

Integrated managementIntegrated managementData link layer (L2)

RACH BCCH AGCH/PCH SDCCH SACCH TCH FACCH

TCH0 TCH1 TCH2 SACCH TCH23 IDLTCH0 TCH1 TCH2 SACCH TCH23 IDLPhysical link layer (L1)


u rame


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CDMACDMA

PowerCDMA

Code

TDMATDMA Frequency

Power

Time

requency

Power FDMA

Frequency



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.

2. Processing of Voice Signal

3. Radio Channel



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2020 msms

13kbit/s13kbit/s8KHz,13bi8KHz,13bitt

((A/DA/D)) SegmentationSegmentation Speech codingSpeech coding Channel codingChannel coding

oice

22.8kbit/s22.8kbit/s

Transmission

vv



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-



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z The EnhanceEnhance Full RateFull Ratecoding mode is called CELPCELP(Code Excited LinearCode Excited Linear

Predictive CodingPredictive Coding)

z The Full RateFull Ratecoding mode is called RPERPE--LTPLTP(Regular Pulse ExcitedRegular Pulse Excited--LongLongTerm Pre iction .Term Pre iction .

z The HalfHalf RateRatecoding mode is called VVSSELPELP ((VectorVector--Sum Excited LinearSum Excited Linear

13kbit/s13kbit/s260 bits(FR)260 bits(FR)

112 bits(HR)112 bits(HR)

5.6kbit/s5.6kbit/s2020 msms

8KHz,13bi8KHz,13bi

tt

Voice

((A/DA/D)) SegmentationSegmentation Speech codingSpeech coding



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Coder1:2

Convolutional

Coder

13kbit/s13kbit/s260 bits(FR)260 bits(FR)

244 bits(EFR)244 bits(EFR) 12.2kbit/s12.2kbit/s8KHz,13bi8KHz,13bi

tt 22.8kbit/s22.8kbit/s456bits(FR/EFR)456bits(FR/EFR)..

((A/DA/D)) SegmentationSegmentation Speech codingSpeech coding

Voice

Channel codingChannel coding

..



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1 2 3 4 5 6 7 8 ... ... 452 453 454 455 456

B

First interleavin :

8

16

2

10

6

14

1

9

4

12

7

15

3

11

5

13

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

..... ....

Second interleaving:

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



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1 2 3 4 5 6 7 8 ... ... 452 453 454 455 456

B

First interleavin :

8

16

2

10

6

14

1

9

4

12

7

15

3

11

5

13

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

..... ....

Second interleaving:

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



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GuardGuard

erioderiodDatDatTrainin se uenceTrainin se uence

bitbit

bitbitaa

57 encrypted bits57 encrypted bits33

bitsbits

8.25 bits8.25 bits26 bits26 bits133

bitsbits

57 encrypted bits57 encrypted bits 1

2020 msms13kbit/s13kbit/s8KHz,13bit8KHz,13bit

Voice



InterleavingInterleaving EncryptionEncryption)) Burst formatting ModulationModulation

ransm ss on



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Speaker

GSM Network

Mobile equipment

33.8 kbit/s

ReceiverDemodulator

TransmitterModulator

TransmitterModulator

ReceiverDemodulator

22.8 kbit/s

Equalization

De-ciphering

De-interleaving

CipheringInterleaving

Channel coding

CipheringInterleaving

Channel coding

Equalization

De-ciphering

De-interleaving

8 kHz

13 bits

Channel decoding

Speech decoding

D/A-conversion

Speech coding

Segmentation

A/D-conversion

Receiving part

D/D-conversion

8 kHz8 bits

64 kbit/s PCM

Channel Decoding

Transmitting part

Receiving partMicrophone

Transmitting part



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The mobile phone should

send the signal in advance!!

Transmission delay t

Transmission delay t



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Frequency

f 0

f 1

f 3

f 4

Frame Time



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z

Shut off the transmission at voice intervals;

The transcoder at the RX terminal produces comfortable noise.

z

VAD: Voice Activity Detection Implemented by the transcoder.

Prolong battery life andre uce n er erence



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z Prolon batter life

z Reduce network interference

z Level and quality are taken into account

z

Si nal level

BCCH Carrier is not

Target level value:

e.g. -85 dmnvo ve n power con ro .



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.

2. Processing of Voice Signal3. Radio Channel



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Frequency

200kHz

BPSlit

Time



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TDMA FRAME

321076543210

200K

Ph sical Channel

577 s

Logical channel

differentmessage

types

Logical channel

Logical channel



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Access burst (AB): Used in MS initial access

8bit 41 synchronousbits

36 encryptedbits

3bit 68.25bit

Tail bit Tail bit Guard intervalData

Frequency correction burst (FB): Used in frequency synchronization

Guard interval

3bit 142bit 3bit 8.25bit

Tail bit Tail bitData

between MS and BTS

Synchronous burst (SB): Used in timing synchronization between

3bit 39 encryptedbits

39 encryptedbits

3bit 8.25bit

Tail bit Tail bit Guard intervalDataData

64 synchronous bits

MS and BTS



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z Normal burst NB

Used to carry the information of the traffic channel and the control channel

except for RACH

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

Tail bit Tail bit Guard intervalDataData

26bit1 1

Training sequence

Frame stealing flag

z u y u

Used in transmission of filling frames by BTS at timeslots when there is no

3bit 142 modulation bits 3bit 8.25bit

Tail bit Tail bit Guard interval



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z

Logical channel

Common channel

(CCH)

Dedicated channel

(DCH)

Broadcast control channel Voice channel

(BCH)

(CCCH)

(TCH)

FCCH SCH BCCH TCH/FAGCH RACH FACCH TCH/HPCH

SACCH

(system information)



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FCCH

SCH

BCCH

BCCHCommonChannel

PCH

AGCHCCCH

SDCCH

SACCH

FACCH

DCCHDedicatedChannel

TCH/F

TCH/HTCH



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Common

channel

SDCCH

SACCH

FACCH

DCCH Dedicatedchannel

TCH/F

TCH/HTCH



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-

Search for synchronous burst

Listen to the system information

SCH

BCCH

Monitor paging messageIdle mode PCH

Allocate signaling channel

Set up the call

AGCH

SDCCHDedicated mode

Allocate voice channel

Conversation

SDCCH

TCH

Release the call FACCH

Idle mode



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26-frame multi-frame

TCH/F+FACCH/F+SACCH/F full-rate TCH

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

- -

FCCH+SCH+BCCH+CCCH (main BCCH)

+ + + + +

BCCH+CCCH (extended BCCH)

SDCCH/8+SACCH/8 (main SDCCH)



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Structure of Main BCCH- .

Group Group1 Group2

Group3,4

(same as Grpup5

Channel F S BX4 CX4 F S CX4 CX4 F S CX4 CX4 I

Frame- -

1 12-- -

4 4-

46-

Number 1 15 0 1 49

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

Channel R R R R R R R R R R R R R RR R R R R

Frame

Number0 1 2 3 4 5 6 7 8 9 10 11 12 13-46 47

4

8

4

950


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


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Structure of Combined BCCH

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

Group Group1 Group2 Group3 Group4 Grpup5

Channel F S

B

4

C

4

F S

C

4

C

4

F S

D0

4

D1

4

F S

D2

4

D3

4

F S

A0

4

A1

4

I

Channel F S

B

4

C

4

F S

C

4

C

4

F S

D0

4

D1

4

F S

D2

4

D3

4

F S

A2

4

A3

4

I

Frame

Number0 1

2-

5

6-

910 11 -

15

-

19

20 21 -

25

-

29

30 31 -

35

-

39

40 41 -

45

-

49

50


Channel D3 4 R R A2 4 A3 4 RR D0 4 D1 4 R R D2 4

Channel D0 4 R R A0 4 A1 4 RR D0 4 D1 4 R R D2 4

Frame

Number0-3 4 5 6-9 10-13 14-36 37-40 41-44 45 46 47-50


F:FCCH; S:SCH; B:BCCH; C:CCCH; D:SDCCH ;A:SACCH; R:RACH; I:IDLE

St t f L i l Ch l


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Structure of Logical Channel

om na on rame- a n1 multi-frame (51TDMA Frames) 235.38ms Downlink

ChannelD0

4

D1

4

D2

4

D3

4

D4

4

D5

4

D6

4

D7

4

A0

4

A1

4

A2

4

A3

4I I I

D0 D1 D2 D3 D4 D5 D6 D7 A4 A5 A6 A7

4 4 4 4 4 4 4 4 4 4 4 4

Frame

Number0-3 4-7 8-11

12-

15

16-

19

20-

23

24-

27

28-

31

32-

35

36-

39

40-

43

44-

4748

4

9

5

0


A5 A6 A7 D0 D1 D2 D3 D4 D5 D6 D7 A0C anne

4 4 4I I I

4 4 4 4 4 4 4 4 4

ChannelA1

4

A2

4

A3

4

I I ID0

4

D1

4

D2

4

D3

4

D4

4

D5

4

D6

4

D7

4

A4

4

Frame

Number0-3 4-7 8-11 12 13 14

15-

18

19-

22

23-

26

27-

30

31-

34

35-

38

39-

42

43-

46

47-

50


D:SDCCH; A:SACCH; I:IDLE


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Structure of Logical Channel

Combination Frame-TCH

1 multi-frame (26TDMA Frames) 120ms

Channel T T T T T T TT A T,,,T T T T T T T I

Frame Number 0 1 2 3 4 5 611 12131

819 20 21 22 23 24 25

Case of two half rate TCHs

1 multi-frame (26TDMA Frames) 120ms

Channel T t T t T t Tt A T,,,t T t T t T t a

Frame Number 0 1 2 3 4 5 611 12131

819 20 21 22 23 24 25


: ; : ; :


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,

Processing of Voice Signal

Radio Channel in Um Interface

Key Technical in Um Interface



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Thank you. .

Documents

1.Oma310000 Gsm Radio Interface Issue2