Huawei Channel Allocation

1

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Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.

GSM Radio Channel Allocation Algorithm

Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved. Page1

Foreword

� To satisfy different environments, many kinds of advanced

radio resource management algorithms are adopted,

including HWII CH allocation algorithm. They are designed

to improve the performance of network.

2


Objectives

� Upon completion of this course, you will be able to:

� Master the main idea of HWII CH Ass. Algorithm

� Master the parameters of HWII CH Ass. Algorithm


Contents

1. HW II Channel Assignment Algorithm Basic

2. Channel Assignment Priorities and Data Configuration

3


Contents




Contents


1.1 Channel Assignment Procedure

1.2 Channel Assignment Strategies

1.3 Detail Priorities of Channel Assignment Strategies

4


Channel Assignment Procedure

TRX:0mainBCCH

SDCCHTCH

SDCCHTCHTCH

TCHTCH

TRX:1SDCCH

TCHTCH

TCHTCHTCH

TCHTCH

TRX:2TCH

TCHTCHTCH

TCHTCH

TCHTCH

TRX:3TCH/H

TCH/HTCH/HTCH/H

TCH/HTCH/H

TCH/HTCH/H

��

��

��

��

�� !"�#��

��$� �

SDCCH Assignment decision

…

TCH Assignment decision

��

�%��


Processing of Channel Assignment

Pre–processing ofChannel Assignment

Yes

Immediate AssignmentRequest on RACH

Assignment RequestFor TCH on SDCCH

IncomingHandover

Huawei II Channel Assignment AlgorithmHigh, Medium and Low Priority

Channel AssignmentSuccessful?

Post–processing ofChannel Assignment

END

No

5


Channel Assignment Strategies

� HW II channel assignment algorithm is based on a ranked selection.

� The following is a default priority–sequence, which can be set by

data configuration.

� Each channel’s overall priority is computed. The available channel

with highest overall priority will be assigned.

High PriorityCapacity Priorities

Quality Priorities

PS Coordination Priorities

ManagementPriorities

Low Priority


Channel Assignment Strategies

� There are four types of channel assignment strategies

Channel Assignment Strategies Priority Sequence

CHAP0 (Capacity preferred) Capacity > Quality > PS coordination > Management

CHAP1 (Quality preferred) Quality > Capacity > PS coordination > Management

CHAP2 (PS Relatively preferred) Capacity > PS coordination > Quality > Management

CHAP3 (PS Absolutely preferred) PS coordination > Capacity > Quality > Management

1) The channel assignment strategy is determined by the parameter “Channel Management-Channel Allocate Strategy”. Generally, CHAP0 is used by default. 2) CHAP1 will be selected for quality handover and reassignment, no matter what the data configuration is.3) If the proportion of PS services is relatively higher and the network quality is good, CHAP2 is recommended .

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Detail Priorities of Channel Assignment Strategies


Quality Priorities



Low Priority

�PDCH distance priority

�PDCH number priority

�TS priority

�Intelligent Power

Consumption Priority

�TRX priority

�Power priority

�Power-saving TRX

priority

�History record priority

�Interference Priority

�Flex Abis priority

�AMR priority

�Different

TRX/Band/TS/MA

priority

�Channel rate priority

�Channel rate adjustment

priority

�Frequency band priority

�IUO priority

�TRX power amplifier

priority

�main BCCH TRX priority


Bit Structures of Channel Assignment Strategies Capacity priorities

– – –

PS coordination priorities

– – –

– – –

Management priorities

––

Quality priorities

–

–

–

–

–

–

––

7


Contents




Contents


2.1 Capacity Priorities and Data Configuration

2.2 Quality Priorities and Data Configuration

2.3 PS Coordination Priorities and Data Configuration

2.4 Management Priorities and Data Configuration

8


Radio Resource Management – Capacity Priorities


Quality Priorities



Low Priority



�TS priority



�TRX priority

�Power priority

�Power-saving TRX

priority




�AMR priority

�Different

TRX/Band/TS/MA

priority



priority


�IUO priority


priority




Bit Code Name Configuration Rule

1–4 RT

Channel

Rate

Priority

The highest bit of Rate

priority Bit 4th

Set to 0.

Group call TCHH

preferentially Bit 2nd

Set to 0. only when the current channel is single and its traffic type is inconsistent, it is set to 1

Matching between TCH rate type and call requirement (bit 3th and bit 1st)

TCHF only or preferentially

TCHH only or preferentially

Single 11 00

Couple 10 01

Idle TCHF 00 10

5 CTE Channel rate adjustment priority If “TCH Rate Adjust Allow” is set to Yes, the priority value is set to 1; otherwise, it is set to 0.

Call Requirement

TCH Rate Type

Capacity priorities

– – –

9


TCH/H

TRX:0BCCH

SDCCHTCH

SDCCHTCH

TCHTCHTCH

TRX:1SDCCH

TCHTCH

TCH

TCH/HTCHTCH

TRX:2TCH

TCHTCH/H

TCHTCH/HTCH

TCHTCH

TRX:3TCH/H

TCH/HTCH/H

TCH/HTCH/HTCH/H

TCH/HTCH/H

Request FR

TCH/F > TCH/H 2 idle > TCH/H 1 idle

Request HR

TCH/H 1 idle > TCH/H 2 idle > TCH/F

Capacity Priorities – Channel Rate Priority


Capacity Priorities – Channel Rate Priority

� The BSC preferentially assigns a half-rate channel if any of

the following conditions is met

Ater Interface Abis Interface Um Interface

Only when [Abis Resource Adjustment TCHH Function Switch] is set to Yes and the load of Abis interface reach certain threshold

Only when [HR Allocation Flag] is set to Openand Ater resource is congested

Non AMR: load > [TCH Traffic Busy Threshold(%)]

AMR: [AMR TCH/H Prior Allowed] is set to ON and load >[TCH/H Prior Cell Load Threshold]

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Capacity Priorities – Channel Rate Adjustment Priority

TRX:4TCH/FTCH/FTCH/FTCH/FTCH/FTCH/FTCH/HTCH/H

TRX:0mainBCCH

SDCCHTCH/FTCH/HTCH/HTCH/FTCH/FTCH/F

TRX:1SDCCHSDCCHTCH/FTCH/FTCH/FTCH/HTCH/HTCH/H

TRX:2SDCCHTCH/HTCH/HTCH/HTCH/HTCH/HTCH/HTCH/H

P–GSM 900 E–GSM 900 DCS1800

TRX:3SDCCHTCH/FTCH/FTCH/FTCH/FTCH/FTCH/HTCH/H

Fixed F or H TCH/F or TCH/H Fixed F or H

0 0 1 1 0Priority

Yes Yes

TCH Rate Adjust Allow

No

Fixed F or H TCH/F or TCH/H

NoNo




6 DCS DCS1800 priority

If the channel belongs to X, the priority value is set to 1; otherwise, it is set to 0.

X is DCS1800, or PCS1900, or GSM480, or GSM450, or GSM850, or GSM–R, or GSM–E, or GSM–P.

7 PCS PCS1900 priority

8 480 GSM480 priority



11 R GSM–R priority

12 E GSM–E priority

13 P GSM–P priority

Capacity priorities

– – –

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TRX Capability of Frequency Band

Outer CellGSM P-900Inner cell

DCS 1800

Band P–GSM E–GSM R–GSM GSM850 GSM450 GSM480 PCS1900 DCS1800

Bit-No 13 12 11 10 9 8 7 6

DCS1800 TRX 0 0 0 0 0 0 0 1

P-900 TRX 1 0 0 0 0 0 0 0

MS1

MS2


Frequency Resource of GSM SystemFrequency Spectrum

Range (MHz)

Uplink Frequency Value

ARFCN Downlink Frequency Value

P-GSM900890~915

935~960Fu(n)=890+0.2n 1�n � 124 Fd(n)=Fu(n)+45

E-GSM900880~915

925~960

Fu(n)=890+0.2n

Fu(n)=890+0.2(n-1024)

0 � n � 124

975 � n � 1023Fd(n)=Fu(n)+45

R-GSM900876~915

921~960

Fu(n)=890+0.2n

Fu(n)=890+0.2(n-1024)

0 � n � 124

955 � n � 1023Fd(n)=Fu(n)+45

DCS1800 1710~1785

1805~1880Fu(n)=1710.2+0.2(n-512) 512 � n � 885 Fd(n)=Fu(n)+95

PCS1900 1850~1910

1930~1990Fu(n)=1850.2+0.2(n-512) 512 � n � 810 Fd(n)=Fu(n)+80

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14 DUPIUO Dual–use

priority

This priority is used when the dynamic PBT algorithm is enabled.If the channel can either form a channel group or be used as an independent channel, the priority value is set to 1; otherwise, the priority value is set to 0.

15 CHGIUO channel

group priority

This priority is used when the dynamic PBT algorithm is enabled. If the preferred subcell of the call is a middle subcell or an underlaid subcell, and the channel can form a channel group, the priority value is set to 0. If the preferred subcell of the call is an overlaid subcell, and the channel cannot form a channel group, the priority value is also set to 0. In other cases, the priority value is set to 1.

16 SBCIUO subcell

priority

This priority is used in channel assignment in a concentric cell.If the subcell on which the channel is located is just the preferred subcell of the call or is not a concentric subcell, the priority value is set to 0; otherwise, it is set to 1.

Capacity priorities

– – –


Data Configuration of Dynamic PBT

� Step2: BTS configuration and maintenance-TRX configuration

13


Capacity Priorities – IUO Subcell Priority

Feature is initiated at any channel change (immediate assignment or

assignment), when cell is in fact concentric.

=> For a MS in the inner cell, the channels (SDCCH or TCH) of the

inner cell have priority, and vice versa

Outer CellInner cell


Radio Resource Management – Capacity PrioritiesCapacity priorities

– – –


17–18 TPOTRX power

amplifier priority

This priority is used in intelligent power consumption decrease

00: indicating that the TRX power amplifier is operational

01: indicating that the BTS receives the startup response and waits for confirmation of the startup status

10: indicating that the BTS waits for a startup response

11: indicating that the TRX power amplifier is shut down

19 BTRXMain BCCH

TRX priority

This priority is used when the tight BCCH algorithm is enabled.If the tight BCCH frequency reuse algorithm is used and the channel is on the main BCCH TRX, the priority value is set to 1; otherwise, the priority value is set to 0. If the tight BCCH frequency reuse algorithm is not used, the priority value is always set to 0.

14


Radio Resource Management – Quality Priorities


Quality Priorities



Low Priority



�TS priority



�TRX priority

�Power priority

�Power-saving TRX

priority




�AMR priority

�Different

TRX/Band/TS/MA

priority



priority


�IUO priority


priority





0–2 HIS–LOW History record priority (low) The priority value is increased by a fixed value two each time a channel seizure fails because of activation NACK, activation timeout, call drop, or other causes. The priority value is increased by a fixed value one each time strong interference is detected on the channel. The priority value is periodically decreased by a value specified by the parameter Update Freq.of CH Record. This value, however, cannot be smaller than zero.

3–4 HIS–MID History record priority (middle)

8 HIS–HIGH History record priority (high)

Quality priorities

–

–

–

–

–

–

––

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Quality Priorities – History Record Priority

Counts

SuccessfulSeizure 0

InterferenceIn Seizure +1

FailedSeizure +2

Call Drop+2

Update Frequency of CH Record

0,…2,…63

Update Period of CH Record1,…30,…1440

History Records Priority Allowed

No Yes

Time




5–7 INTER Interference priorityThe priority value is refreshed based on the interference band reported by the BTS.

9 FABS Flex Abis priority This priority is used when Flex Abis is enabled. The priority value is set to 1 if Flex Abis Mode is set to Flex Abis; otherwise, it is set to 0.

Quality priorities

–

–

–

–

–

–

––

16


Quality Priorities – Interference Priority

Distance

I levelTRX:0

BCCHSDCCH

TCHSDCCH

TCHTCHTCH

TCH

TRX:1SDCCH

TCH

TCHTCH

TCHTCHTCH

TCH

I level of TRX:1

I level of TRX:0

Frequency of TRX:1

Frequency of TRX:0

Reuse Distance

TRX:0 has higher priority

Interference PriorityYes No

Interference MeasYes No




10–11 AFR AMR priority

MS support AMR or not

Channel support AMR or not

Frequency reuse mode Weight value

Yes

Yes loose 01

tight 00

No loose 10

tight 11

No

Yes loose 01

tight 11

No loose 00

tight 10

Quality priorities

–

–

–

–

–

–

––

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27 DTNDifferent timeslot

For intra–cell handover result from quality and reassignment, if the timeslot number on which the channel is located is different from that the original channel, the priority value is set to 0; otherwise, it is set to 1.During the assignment of any other channel, the priority value is always set to 0.

28 DTDifferent

TRX

For intra–cell handover result from quality and reassignment, if the TRX on which the channel is located is different from that assigned for the last call, the priority value is set to 0; otherwise, it is set to 1. During the assignment of any other channel, the priority value is always set to 0.

29 DHM Different MA

For intra–cell handover result from quality and reassignment, if the MA on which the channel is located is different from that of the original channel, the priority value is set to 0; otherwise, it is set to 1.During the assignment of any other channel, the priority value is always set to 0.

30 DBDifferent

band

For intra–cell handover result from quality and reassignment, if the frequency band on which the channel is located is different from that assigned for the last call, the priority value is set to 0; otherwise, it is set to 1. During the assignment of any other channel, the priority value is always set to 0

Quality priorities

–

–

–

–

–

–

––


Quality Priorities – Different TS/TRX/MA/Band Priority

TRX:0BCCH

SDCCHTCH

SDCCH

TCHTCHTCH

TCH

TRX:1SDCCH

TCHTCHTCH

TCHTCHTCH

TCH

Effective in:

� Re–assignment

� Intra–cell bad quality HO

� Intra–cell interference HO

Allocate a new channel as different as possible from the old one.

18


Radio Resource Management – PS Coordination Priorities


Quality Priorities



Low Priority



�TS priority



�TRX priority

�Power priority

�Power-saving TRX

priority




�AMR priority

�Different

TRX/Band/TS/MA

priority



priority


�IUO priority


priority



Radio Resource Management – PS Coordination PrioritiesPS coordination priorities

– – –


0–2 PDISPDCH distance

priority

The minimum distance to PDCH. The channel that is the farthest from the PDCH timeslot is preferentially assigned to the CS service. That is to say, the closer the distance, the lower the priority.

3–5 PDNMPDCH number

priority

The number of PDCH in the same TRX. The channel on the TRX with less PDCHs should be preferentially assigned to the CS services.

19


PS Coordination Priorities – PDCH Priority

TRX:0BCCH

SDCCHTCH

TCHPDCHPDCH

PDCHPDCH

high

low

TRX:0BCCH

SDCCHTCH

SDCCHPDCHPDCH

PDCHPDCH

TRX:1SDCCH

TCHTCH

TCHTCH

PDCH

PDCHPDCH

PDCH Number PriorityPDCH Distance Priority


Radio Resource Management –Management Priorities


Quality Priorities



Low Priority



�TS priority



�TRX priority

�Power priority

�Power-saving TRX

priority




�AMR priority

�Different

TRX/Band/TS/MA

priority



priority


�IUO priority


priority


20


Radio Resource Management –Management Priorities

Management priorities

– – –––


0–2 TS TS priorityBased on “TRX Attributes–Channel Attributes–TimeSlot Priority” configuration parameter (value rang: 0~7).

3–5 PAIntelligent Power

ConsumptionPriority

According to the “TRX Attributes–Device Attributes–Priority of Shut Down TRX” Configuration parameter” (value range:0~7).

6–11 TRX TRX priority Based on “TRX Attributes–Device Attributes–TRX Priority” configuration parameter (value rang: 0~7).


Radio Resource Management –Management PrioritiesManagement priorities

– – –––


12–15 PWR Power priority

This bit is enabled only when MML “Cell configuration and maintenance-cell network optimization parameter configuration-channel management parameter configuration-SET GCELL CHMGAD-Power Priority Allowed ” is Yes,

16 ICBintelligent combiner bypasspriority

If BCCH carrier is in DTRU, DRRU, or DRFU, for another carrier, who is in the same cell with this BCCH carrier, not attend baseband hopping, and “ICB Allowed” in this cell is yes, all channel of which is set 1, otherwise 0.

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Management Priorities – Intelligent Power Consumption Principle

TRX:0mainBCCH

SDCCH

TCHSDCCH

TCH

TCHTCH

TCH

TRX:1SDCCH

TCH

TCHTCHTCH

TCHTCH

TCH

TRX:3TCHTCH

TCHTCH

TCHTCHTCH

TCH

TRX:2TCH/HTCH/H

TCH/HTCH/H

TCH/HTCH/HTCH/H

TCH/H

A TRX running at normal power has higher priority for

assignment than low power ones. As a result of that

prioritization a no power TRX can be powered down.

High Power Low Power


Summary

� In this course, we have learned

� HW II channel assignment algorithm principle

� HW II channel assignment algorithm data configuration

� Application should be rollout based on real environment.

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Huawei Channel Allocation

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