Microsoft Power Point - 1 Omf000001 Um Interface And Radio Channels Issue2

Um Interface and Radio Channels www.huawei.com

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

Contents 1. Overview 2. Processing of Voice Signal 3. Radio Channel

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

Page2

Radio Interface Another MSC PSTN ISDN

BTS BSC MS

A-bis

A

MSC/VLR

HLR/AUC

MS

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

SMC

OMC

Page3

Hierarchical Structure of Um Interface Communication management (CM) Network application layer (L3) Mobility and security management (MM) Radio resources management (RR)

Data link layer (L2)

RACH

Physical link layer (L1)

Integrated management

BCCH

AGCH/PCH

SDCCH

SACCH

TCH

TCH0 TCH1 TCH2 。。SACCH 。。TCH23 IDL 。。 。。 Multiframe

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Page4

FACCH

Radio Access Technology Time

Time

TDMA

FDMA

Frequency

Frequency

Time CDMA Code

Frequency

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Page5

Radio Access Technology Time

Time

TDMA

FDMA

Frequency

Frequency

Time CDMA Code

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

Page6

Contents 1. Overview 2. Processing of Voice Signal 3. Radio Channel

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Page7

Voice Signal Processing

20ms A/D A/D

Voice

8KHz， ，13bit

Segme Segme ntation ntation

Speech Speech coding coding

13kbit/s Channel Channel coding coding

22.8kbit/s

33.8kbit/s Interleaving Interleaving

Encryption Encryption

Burst Burst formatting formatting

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Modulation Modulation

Page8

Transmission

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 subframes; the duration of every sub-frame is 5ms; and the pure bit rate is 13kbit/s.

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Page9

Channel Coding +3 50bit

*2+4

Block Block coder coder

132bit

Excited Excited coder coder

78bit

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Page10

456bit

Interleaving B 11 22 33 44 55 66 77 88 ... ...

First interleaving:

....

... ... 452 452 453 453 454 454 455 455 456 456

B0

B1

B2

B3

B4

B5

B6

B7

1 9

2 10

3 11

4 12

5 13

6 14

7 15

8 16

. .

. .

. .

. .

. .

. .

. .

. .

. 449

. 450

. 451

. 452

. 453

. 454

. 455

. 456

....

Second interleaving:

{A4,B0} {A4,B0}

{A5,B1} {A5,B1}

{A6,B2} {A6,B2}

{A7,B3} {A7,B3}

{B4,C0} {B4,C0}

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{B5,C1} {B5,C1}

{B6,C2} {B6,C2}

Page11

{B7,C3} {B7,C3}

Interleaving B 11 22 33 44 55 66 77 88 ... ...

First interleaving:

....

... ... 452 452 453 453 454 454 455 455 456 456

B0

B1

B2

B3

B4

B5

B6

B7

1 9

2 10

3 11

4 12

5 13

6 14

7 15

8 16

. .

. .

. .

. .

. .

. .

. .

. .

. 449

. 450

. 451

. 452

. 453

. 454

. 455

. 456

....

Second interleaving:

{A4,B0} {A4,B0}

{A5,B1} {A5,B1}

{A6,B2} {A6,B2}

{A7,B3} {A7,B3}

{B4,C0} {B4,C0}

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{B5,C1} {B5,C1}

{B6,C2} {B6,C2}

Page12

{B7,C3} {B7,C3}

Voice Burst

33

57 57

11

26 26

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11

57 57

Page13

33

Timing Advance (TA) The mobile phone should send the signal in advance!!

TA Transmission delay t

Transmission delay t

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Page14

Timing Advance (TA) The mobile phone should send the signal in advance!!

TA Transmission delay t Transmission delay t

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Page15

Frequency Hopping Frequency f0 f1 f2 f3 f4 Frame

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Time

Page16

Frequency Hopping Frequency

f0 f1 f2 f3 f4 Time

Frame

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Page17

DTX





DTX: Discontinuous Transmission 

Shut off the transmission at voice intervals;



Only transmit SID frames’



The transcoder at the RX terminal produces comfortable noise.

VAD: Voice Activity Detection 

Implemented by the transcoder.

Prolong battery life and reduce interference

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

Page18

DTX





DTX: Discontinuous Transmission 

Shut off the transmission at voice intervals;



Only transmit SID frames’



The transcoder at the RX terminal produces comfortable noise.

VAD: Voice Activity Detection 

Implemented by the transcoder.

Prolong battery life and reduce interference

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

Page19

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 Signal level

Target level value: e.g. -85 dm

BCCH Carrier is not involved in power control.

Time

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Page20

Contents 1. Overview 2. Processing of Voice Signal 3. Radio Channel

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

Page21

Frame and Channel Frequency

200kHz

Time

BP Slit 15/26ms Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.

Page22

Logical Channel Type


GSM900 and DCS1800 have the same logical channel category Logical channel

Dedicated channel (DCH)

Common channel (CCH)

Broadcast control channel (BCH)

FCCH

SCH

Common control channel (CCCH)

BCCH PCH (system information)

AGCH

RACH

Voice channel (TCH)

Control channel

SDCCH

FACCH

SACCH

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Page23

TCH/F

TCH/H

Downlink Logical Channel FCCH Common Channel

BCCH

SCH BCCH

CCCH

PCH AGCH

SDCCH

Dedicated Channel

DCCH

SACCH FACCH

TCH

TCH/F TCH/H

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Page24

Downlink Logical Channel FCCH Common Channel

BCCH

SCH BCCH

CCCH

PCH AGCH

SDCCH

Dedicated Channel

DCCH

SACCH FACCH

TCH

TCH/F TCH/H

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Page25

Uplink Logical Channel

RACH

CCCH

Common channel

SDCCH SACCH

DCCH

FACCH TCH/F TCH/H

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TCH

Page26

Dedicated channel

Uplink Logical Channel

RACH

CCCH

Common channel

SDCCH SACCH

DCCH

FACCH TCH/F TCH/H

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

TCH

Page27

Dedicated channel

Use of Logical Channels “off” state Search for frequency correction burst

FCCH

Search for synchronization sequence

SCH BCCH

Read system information

idle mode

dedicated mode

PCH

Listen paging message Send access burst

RACH

Wait for signaling channel allocation

AGCH

Call setup

SDCCH

Assign traffic channel

SDCCH

Conversation

TCH

Call release

FACCH

idle mode

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Page28

Burst • Access burst (AB): Used in MS initial access Tail bit

8bit

Data 41 synchronous bits

Tail bit

36 encrypted bits

3bit

Guard interval

68.25bit

• Frequency correction burst (FB): Used in frequency synchronization between MS and BTS Tail bit

Data

3bit

142bit

Tail bit

Guard interval

3bit

8.25bit

• Synchronous burst (SB): Used in timing synchronization between MS and BTS Tail bit

Data

3bit

39 encrypted bits

Data 64 synchronous bits

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

39 encrypted bits

Page29

Tail bit

Guard interval

3bit 8.25bit

Burst • Normal burst (NB): Used to carry the information of the traffic channel and the control channel except for RACH Tail bit

Data

3bit

57 encrypted bits

Training sequence

1 26bit 1

Data 57 encrypted bits

Tail bit Guard interval

3bit

8.25bit

Frame stealing flag

• Dummy burst (DB): Used in transmission of filling frames by BTS at timeslots when there is no information delivered Tail bit

3bit

Tail bit

3bit

142 modulation bits

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Page30

Guard interval

8.25bit

Physical Combination of Logical Channel 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)

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

Page31

Structure of Main BCCH 1 multi-frame (51TDMA Frames) 235.38ms Downlink Group3,4

Group

Group1

Group2

(same as

Grpup5

Group2)

Channel Frame Number

F

S

BX4

CX4

F

S

CX4

CX4

……

F

S

CX4

CX4

I

0

1

2-5

6-9

10

11

12-15

16-19

20-39

40

41

42-45

46-49

50

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

R

R

R

R

R

R

R

R

R

R

R

R

R

R……R

R

R

R

R

0

1

2

3

4

5

6

7

8

9

10

11

12

13-46

47

48

49

50

F:FCCH; S:SCH; B:BCCH; C:CCCH; I:IDLE; R:RACH Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.

Page32

Structure of Combined BCCH 1 multi-frame (51TDMA Frames) 235.38ms Downlink Group

Group1

Channel

F

S

Channel

F

S

0

1

Frame Number

Group2

B×

C×

4

4

B×

C×

4

4

2-5

6-9

F

S

F

S

10

11

Group3

C×

C×

4

4

C×

C×

4

4

12-

16-

15

19

F

S

F

S

20

21

Group4

D0

D1

×4

×4

D0

D1

×4

×4

22-

26-

25

29

F

S

F

S

30

31

1 multi-frame (51TDMA Frames) 235.38ms

Grpup5

D2

D3

×4

×4

D2

D3

×4

×4

32-

36-

35

39

F

S

F

S

40

41

A0

A1

×4

×4

A2

A3

×4

×4

42-

46-

45

49

I

I

50

Uplink

Channel

D3×4

R

R

A2×4

A3×4

R……R

D0×4

D1×4

R

R

D2×4

Channel

D0×4

R

R

A0×4

A1×4

R……R

D0×4

D1×4

R

R

D2×4

0-3

4

5

6-9

10-13

14-36

37-40

41-44

45

46

47-50

Frame Number

F:FCCH; S:SCH; B:BCCH; C:CCCH; D:SDCCH ;A:SACCH; I:IDLE; R:RACH Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.

Page33

Structure of Logical Channel Combination Frame-Main SDCCH 1 multi-frame (51TDMA Frames) 235.38ms Downlink Channel

Channel Frame Number

D0×

D1×

D2×

D3×

D4×

D5×

D6×

D7×

A0×

A1×

A2×

A3×

4

4

4

4

4

4

4

4

4

4

4

4

D0×

D1×

D2×

D3×

D4×

D5×

D6×

D7×

A4×

A5×

A6×

A7×

4

4

4

4

4

4

4

4

4

4

4

4

0-3

4-7

8-11

12-

16-

20-

24-

28-

32-

36-

40-

44-

15

19

23

27

31

35

39

43

47

I

I

I

I

I

I

48

49

50

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

A5×

A6×

A7×

4

4

4

A1×

A2×

A3×

4

4

4

0-3

4-7

8-11

I

I

I

I

I

I

12

13

14

D0×

D1

D2×

D3×

D4×

D5×

D6×

D7×

A0×

4

×4

4

4

4

4

4

4

4

D0×

D1

D2×

D3×

D4×

D5×

D6×

D7×

A4×

4

×4

4

4

4

4

4

4

4

15-

19-

23-

27-

31-

35-

39-

43-

47-

18

22

26

30

34

38

42

46

50

D:SDCCH; A:SACCH; I:IDLE Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.

Page34

Structure of Logical Channel Combination Frame-TCH 1 multi-frame (26TDMA Frames) 120ms

Channel

Frame Number

T

T

T

T

T

T

T…T

A

T,,,T

T

T

T

T

T

T

I

0

1

2

3

4

5

6…11

12

13…18

19

20

21

22

23

24

25

T:TCH;A:SACCH; I:IDLE

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Page35

Frame 1 hyper frame=2048 super-frames=2715648TDMA frames (3 hours, 28 minutes, 53 seconds and 760 milliseconds) 0

TCH SACCH/T FACCH

1

2

3

2045

2044

2046

BCCH CCCH SDCCH

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

0 0

2

3

47

0

48

1

1

1

49

24

1 multiframe=26TDMA frames (120ms) 0

24

2047

50 25

1 multiframe=51TDMA frames (3060/13ms) 25

0

1TDMA frame=8 timeslots (120/26=4.615ms) 2 3 4 5 6

1

49

50

7

1 timeslot=156.25 bit duration (15/26=0.577ms) (1 bit duration: 48/13=3.68us) 26 training TB 58 information bits sequences 3 Frequency correction burst (FB) TB Constant bit 142 3 TB Information bit 39 Extended training sequence 64 Synchronous burst (SB) 3 TB Synchronous sequence 41 TB Information bit 36 3 Access burst (AB) 3

Normal burst (NB)

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58 information bits

Information bit 39 GP 68.25

Page36

TB 3 TB 3

GP 8.25 GP 8.25

TB GP 3 8.25

TB: Tail bit GP: Guard period

Frame 1 hyper frame=2048 super-frames=2715648TDMA frames (3 hours, 28 minutes, 53 seconds and 760 milliseconds) TCH SACCH/T FACCH

0

1

2

3

2045

2044

2046

BCCH CCCH SDCCH

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

0

2

0

3

47

48

1

49

24

1 multiframe=26TDMA frames (120ms) 0

1

2047

50 25

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

24

25

0

1

49

50

1TDMA frame=8 timeslots (120/26=4.615ms) 0

1

2

3

4

5

6

7

1 timeslot=156.25 bit duration (15/26=0.577ms) (1 bit duration: 48/13=3.68us) TB 58 information bits 3 Frequency correction burst (FB) TB 3 TB Information bit 39 Synchronous burst (SB) 3 TB Synchronous sequence 41 Access burst (AB) 3 Normal burst (NB)

26 training sequences

58 information bits

Constant bit 142 Extended training sequence 64 Information bit 36

TB 3

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TB GP 3 8.25

TB GP 3 8.25 TB GP Information bit 39 3 8.25 GP 68.25

Page37

TB: Tail bit GP: Guard period

Configuration of Common Control Channel

Downlink CCCH

PCH

Uplink CCCH

AGCH

RACH

How to determine the total CCCH resources of the cell? How to allocate AGCH and PCH reasonably?

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Page38

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