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)
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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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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
22.8kbit/s22.8kbit/s
33.8kbit/s33.8kbit/s
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
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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
1 multi-frame (51TDMA Frames) 235.38ms Uplink
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
Copyright 2011 Huawei Technologies Co., Ltd. All rights reserved. Page35
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
1 multi-frame (51TDMA Frames) 235.38ms Uplink
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
Copyright 2011 Huawei Technologies Co., Ltd. All rights reserved. Page36
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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: ; : ; :
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,
Processing of Voice Signal
Radio Channel in Um Interface
Key Technical in Um Interface
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Thank you. .