10_UMTS, HSPA RRM Principles & Parameter Structure - HSDPA Code Management

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Contents

Introduction to Radio Resource Management

Power Control

Load Control

Admission Control

Packet Scheduling

Code Tree Management

PLMN and Cell Selection

Handover Procedures

HSDPA Protocol Features

HSDPA Power Management

HSDPA Code Resource Management

HSDPA Mobility

HSUPA Protocol Features

HSUPA Power Management

HSUPA Mobility

HSPA+

UMTS/HSPA Radio Resource Management & Parameter


Content


Configuration of HSDPA Code Resources

Dynamic Handling of Code Resources


Content





128 128 128

Available for HSDPA Allocated CC Blocked CC

SF16

SF32 32

SF64 64 64 64

SF256 256 256 256 256 256 256 256 256 256 256 256 256 256 256 256

128 128 128 128 128 128 128 SF128

+15 x SF16

HS-PDSCH

CPICH, BCH, AICH, PICH

FACH (PCH)

(PCH) HS-SCCH HS-SCCH HS-SCCH

Code Tree with HSDPA

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HSDPA easily leads to a blocking of the code

tree, especially if the maximum of 15 codes of SF

16 is allowed. If both FACH and PCH are mapped

onto a single S-CCPCH, than up to 4 HS-SCCHs

can be realised simultaneously in this case. If

FACH and PCH are mapped onto different S-

CCPCHs, there is space for only up to 3 HS-

SCCHs.


Static and Dynamic Code Resources

SF16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16

Blocked by

common CHs Guaranteed for HSDPA Dynamically shared by R99 and HSDPA

- A minimum number of codes can be reserved for HSDPA

- Further code resources can be allocated dynamically to HSDPA

in dependence on the amount and priority of R99 traffic

- Code resources allocated to HSDPA must be adjacent

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The code sharing between R99 and HSDPA

traffic might be compared with the GPRS territory

concept on the 2.5G air interface. A certain

amount of resources is available exclusively for

HSDPA. On the remaining resources voice traffic

has higher priority for any vendor. The handling of

the priority of other R99 traffic is vendor specific.

When the first HSDPA user enters the cell, the

service starts with the minimum number of codes.


Number of HSDPA Codes

Minimum number of HSDPA codes

Maximum number of HSDPA codes

HSPDSCHCodeSet

Parameter of 16 bit to enable/disable a specific number of codes

Examples

00000 00000 100000 = 5 codes reserved, static configuration (default)

11010 10100 100000 = 5,8,10,12,14 or 15 codes reserved, dynamic configuration

NSN

numHsPdschCodes

Minimum number of codes

5..15, 5

maxNumHsPdschCodes

Maximum number of codes

5..15, 5

Ericsson

All settings per cell

0-4 codes always disabled 11-15 codes

6-10 codes

HsPdschMinCodeNum

Minimum number of codes

1..15, 5

HsPdschMaxCodeNum

Maximum number of codes

1.15, 10

Huawei

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According the Ericsson and Huawei

implementation the number of codes offered to

HSDPA changes just by 1, if an adjustment is

done. In case of NSN the number of codes is

changed by a bigger step (e.g. immediately from 5

to 8), if specific numbers of codes (e.g. 6 and 7)

are disabled. With the NSN implementation

therefore a faster upgrade (and downgrade) of the

HSDPA resources is possible. On the other side

more frequently an upgrade is blocked due to the

lack of free adjacent codes.

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Content





Upgrade of HSDPA Code Resources

- Upgrade of HSDPA code resources based on periodic monitoring of the traffic by the RNC

The period is either settable (NSN) or hard coded (Ericsson, Huawei)

- If there are unused adjacent codes, these can be offered to HSDPA

The number of additional codes per upgrade is either settable (NSN) or hard coded to 1 code

(Ericsson, Huawei), see last slide

- According NSN upgrade allowed only, if afterwards still enough free codes of SF128 for voice (default 8 codes)

- According Huawei upgrade allowed only, if afterwards still one free code of a specific SF for R99 (default SF8)

Adjustment period for HSDPA code resources

SF16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16

Blocked by

common CHs Guaranteed for HSDPA Blocked by DCH

or unused

Unused

Available for HSDPA

HSPDSCHAdjustPeriod

1..60 s, 10 s

Configurable on RNC level only

NSN

Hard coded

1 s

Ericsson

Hard coded

Huawei

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According Ericsson an upgrade of HSDPA

resources is allowed in any case, if a free

adjacent code is available. NSN checks, whether

after an upgrade still enough voice capacity would

be available, while Huawei checks for the

availability of R99 resources in general. If after the

HSDPA upgrade not enough code resources

would be available for voice / R99 in general,

according NSN / Huawei it is not allowed.

The requirement of NSN to leave at least 8 codes

of SF128 free for voice leads effectively to the

loss of a further code of SF16 for HSDPA, i.e. the

maximum is not 15, but 14 codes.

The requirement of Huawei to leave 1 code of SF

8 free for R99 leads effectively to the loss of even

2 more codes of SF 16, i.e. the maximum is 13

codes only.


Downgrade of HSDPA Code Resources

- According Ericsson HSDPA is downgraded immediately, if otherwise the setup

or upgrade of a DCH would be blocked

- According NSN HSDPA is downgraded in the following cases

DCH for voice would be blocked (immediate downgrade)

DCH for NRT service would be blocked AND the number of codes actually

offered to HSDPA is very high (default at least 10 codes, immediate downgrade)

Not enough codes of SF128 available for voice (default 8 codes)

The last criterion is checked periodically according HSPDSCHAdjustPeriod

- According Huawei HSDPA is downgraded in the following cases

DCH for voice would be blocked (immediate downgrade)

No code of specific SF available for R99 (default SF8)

The last criterion is checked periodically

- The number of HSDPA codes never is downgraded below the guaranteed minimum

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According Ericsson and Huawei the setup or

upgrade of a DCH always has higher priority than

a huge amount of HSDPA codes. In case of NSN

HSDPA has higher priority, if there is an incoming

request for R99 NRT and at the same time the

number of codes allocated to HSDPA still is below

a configurable threshold (default 10 codes).

As the only vendor NSN applies a proactive

downgrade even without DCH blocking: If not

enough free codes with SF128 are available any

more for voice (default 8 codes), HSDPA is

downgraded. In this case, however, no

immediate, but a periodic downgrade is performed

only.

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10_UMTS, HSPA RRM Principles & Parameter Structure - HSDPA Code Management

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