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Copyright © All rights reserved TA -TC 6120 – 01/2005 TECHCOM Consulting TA -TC 6420 E01 TECHCOM Consulting Copyright © All rights reserved Customized Course TECHCOM Consulting 1
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
Copyright © All rights reserved TA -TC 6120 – 01/2005 TECHCOM Consulting TA -TC 6420 E01 TECHCOM Consulting Copyright © All rights reserved Customized Course TECHCOM Consulting 2
Content
HSDPA Code Resource Management
Configuration of HSDPA Code Resources
Dynamic Handling of Code Resources
Copyright © All rights reserved TA -TC 6120 – 01/2005 TECHCOM Consulting TA -TC 6420 E01 TECHCOM Consulting Copyright © All rights reserved Customized Course TECHCOM Consulting 3
Content
HSDPA Code Resource Management
Configuration of HSDPA Code Resources
Dynamic Handling of Code Resources
Copyright © All rights reserved TA -TC 6120 – 01/2005 TECHCOM Consulting TA -TC 6420 E01 TECHCOM Consulting Copyright © All rights reserved Customized Course TECHCOM Consulting 4
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.
Copyright © All rights reserved TA -TC 6120 – 01/2005 TECHCOM Consulting TA -TC 6420 E01 TECHCOM Consulting Copyright © All rights reserved Customized Course TECHCOM Consulting 6
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.
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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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Copyright © All rights reserved TA -TC 6120 – 01/2005 TECHCOM Consulting TA -TC 6420 E01 TECHCOM Consulting Copyright © All rights reserved Customized Course TECHCOM Consulting 11
Content
HSDPA Code Resource Management
Configuration of HSDPA Code Resources
Dynamic Handling of Code Resources
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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.
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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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