Iur Strategy of Utran Network
Iur Strategy of Utran Network
ZTE Confidential Proprietary © 2011 ZTE Corporation. All rights reserved.
Iur Strategy of Utran Network
TABLE OF CONTENTS
Iur Strategy of Utran Network..................................................................................................1
1 Introduction........................................................................................................................ 3
1.1 Purpose.................................................................................................................. 3
1.2 Scope..................................................................................................................... 3
1.3 General Principle....................................................................................................3
1.4 Using IUR and No IUR strategy compare..............................................................4
1.5 Related Parameter.................................................................................................5
Related Parameters for ZTE-SRNC........................................................................................5
2 IUR Strategy Summary.....................................................................................................6
2.1 Strategy for Intra-frequency Scenario with Iur........................................................6
2.1.1 Between ZTE and Ericsson........................................................................6
Strategy for Intra-frequency Scenario between ZTE and Ericsson with Iur.............................6
2.1.2 Between ZTE and HW................................................................................7
Strategy for Intra-frequency Scenario between ZTE and HW with Iur.....................................7
2.1.3 Between ZTE and ZTE...............................................................................7
Strategy for Intra-frequency Scenario between ZTE and ZTE with Iur....................................7
2.2 Strategy for Inter-frequency Scenario with Iur........................................................8
2.2.1 Between ZTE and Ericsson........................................................................8
Strategy for Inter-frequency Scenario between ZTE and Ericsson with Iur.............................8
2.2.2 Between ZTE and HW................................................................................8
Strategy for Inter-frequency Scenario between ZTE and HW with Iur.....................................8
2.2.3 Between ZTE and ZTE...............................................................................9
Strategy for Inter-frequency Scenario between ZTE and ZTE with Iur....................................9
2.3 Strategy for Scenario without Iur............................................................................9
2.3.1 Between ZTE and Ericsson........................................................................9
2.3.2 Between ZTE and HW................................................................................9
2.3.3 Between ZTE and ZTE...............................................................................9
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Iur Strategy of Utran Network
1 Introduction
1.1 PurposeThis document describes the Iur strategy for between ZTE-Ericsson and ZTE-HW RNC
inter-working issues.
1.2 ScopeThis document covers the different service handover and relocation related issues
between ZTE-Ericsson and ZTE-HW in UMTS system. The strategy will focus on both
intra-frequency and inter-frequency handover scenarios. Also there will be some words to
describe the strategy about without Iur connection.
1.3 General PrincipleThe strategies of inter-frequency scenario and without Iur connection scenario are
simpler than intra-frequency scenario. The general principle of intra-frequency Iur
strategy recommended by ZTE are list blow, all of these were got from global Inter-
Operability Test experience.
When ZTE RNC acts as DRNC, the Iur strategy is decided by for Ericsson and HW RNC
that acts as SRNC. No matter what strategy (Relocation/DSCR/Keep via Iur) is can be
support by ZTE-DRNC.
When ZTE RNC acts as SRNC, after the measurement report triggering handover to
Ericsson and HW RNC that acts as DRNC is received, fallback procedure will be
performed firstly if HSPA(HSDPA or HSUPA) service is involved.
We illustrate it in the following figure:
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Iur Strategy of Utran Network
Figure 1 General Principle of Intra-frequency strategy
1.4 Using IUR and No IUR strategy compare
Item Using IUR No IUR
Handover Soft handover success rate is
more than 99%
Customers perceptions is good
Hard handover success rate is
nearly 70%
Customers perceptions is bed
Call Drop Less(SHO SR) More(HHO SR)Pilot pollution
on IUR board
No All over on IUR board
IURlink
load(Relocatio
n)
For continued call From SRNC
to DRNC,IUR Links is release
after relocation
No
IUR link
load(No
Relocation)
For continued call From SRNC
to DRNC,IUR Links is keeping
until that call is release.
No
NOTES: Relocation and no Relocation effect
1. IUR Relocation can save the IUR Link resource.
2. IUR Relocation can reduce the SRNC call drop rate.
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Iur Strategy of Utran Network
3. IUR Relocation will due on DRNC response.IUR strategy between ZTE and ZTE
relocation was on.
1.5 Related ParameterThere are several parameters used to control the strategy when ZTE RNC acted as
SRNC. They can be configured separated to different Target RNC object and
summarized in the table below.
Related Parameters for ZTE-SRNC
Parameters Name Name on the
Interface
Explain
RncFeatSwitch0 Hard-handover With
Relocation
Whether relocation is involved in
hard handover. Value 1 means
hard handover without relocation
and 0 means hard handover with
relocation.
RncFeatSwitch1 Support HSDPA Iur
Interface Process
Whether HSDPA IUR procedure
will be supported. Value 1 means
support and 0 means not support.
RncFeatSwitch2 Support HSUPA Iur
Interface Process
Whether HSUPA IUR procedure
will be supported. Value 1 means
support and 0 means not support.
RncFeatSwitch4 Support Hard
Handover DSCR
Whether Hard Handover DSCR will
be support. Value 1 means support
and 0 means not support.
RncFeatSwitch7 Use DSCR for PS
service when UE all
RLs need moved to
DRNC
Whether PS service will DSCR in
DRNC. Value 1 means perform
DSCR and 0 means not perform.
RNCFeatSwitch10 Support UE not
Involved Relocation
for CS Service
Whether UE not involved relocation
procedure will be support for CS
Service. Value 1 means support
and 0 means not support.
RNCFeatSwitch11 Support UE not
Involved Relocation
for PS Service
Whether UE not involved relocation
procedure will be support for PS
Service. Value 1 means support
and 0 means not support.
bAal2Server Peer RNC is AAL2
Server
Whether DRNC is AAL2 server or
not. Value 1 means YES and 0
means NOT. Need set it to “YES”
because the ATM address in radio-
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Iur Strategy of Utran Network
link-setup-response message is not
RNC’s but NodeB’s when Ericsson
RNC acting as DRNC and transport
network is ATM. Other situation
need set to “NO”.
IMPORTANT NOTE:
1. Some of these parameters are imported in version RNCV3.07.310p and RNCV3.09.30
and can not apply to any previous versions.
2. For some historical reason, to enable DSCR feature, we must set both RNCFeatSwitch11
and RNCFeatSwitch7 to one. Maybe we will get rid of this confusing limit in the future
version.
2 IUR Strategy Summary
2.1 Strategy for Intra-frequency Scenario with Iur
2.1.1 Between ZTE and Ericsson
Strategy for Intra-frequency Scenario between ZTE and Ericsson with Iur
Services ZTE -> Ericsson Ericsson ->ZTE
Voice (AMR 12.2kbps) SHO, without relocatoin SHO, without relocatoin
PS Release 99 DSCR DSCR
HSPA Fall back to DCH & DSCR Fall back to DCH & DSCR
Voice+R99 Multi-Rab SHO
If Cs release, Ps DSCR
If Ps release, Cs SHO
Multi-Rab SHO
If Cs release, Ps DSCR
If Ps release, Cs SHO
Voice+HSPA Fall back to DCH,
Multi-Rab SHO
If Cs release, Ps DSCR
If Ps release, Cs SHO
Fall back to DCH,
Multi-Rab SHO
If Cs release, Ps DSCR
If Ps release, Cs SHO
Video SHO, without relocatoin SHO, without relocatoin
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Iur Strategy of Utran Network
NOTES: According to the test result from TRT of KPN for intra-frequency scenario,
Ericsson RNC does not support:
1. UE not involved relocation of CS service.
2. Relocation procedure for all kind of PS services.
2.1.2 Between ZTE and HW
Strategy for Intra-frequency Scenario between ZTE and HW with Iur
Services ZTE -> HW HW ->ZTE
Voice (AMR 12.2kbps) SHO, without relocatoin SHO, without relocatoin
PS Release 99 SHO, relocation SHO, relocation
HSPA Fall back to DCH &
relocation
Fall back to DCH &
relocation
Voice+R99 Multi-Rab SHO
If Cs release, Ps relocation
If Ps release, Cs hold on
Multi-Rab SHO
If Cs release, Ps relocation
If Ps release, Cs hold on
Voice+HSPA Fall back to DCH,
Multi-Rab SHO
If Cs release, Ps relocation
If Ps release, Cs hold on
Fall back to DCH,
Multi-Rab SHO
If Cs release, Ps relocation
If Ps release, Cs hold on
Video SHO, without relocatoin SHO, without relocatoin
NOTES: According to the test result from lab of China UniCom for intra-frequency
scenario, HW RNC does not support UE not involved relocation of CS service. And there
are some unclear issues when HSPA service over Iur interface.
2.1.3 Between ZTE and ZTE
Strategy for Intra-frequency Scenario between ZTE and ZTE with Iur
Services ZTE<->ZTE
Voice (AMR 12.2kbps) SHO, relocation
PS Release 99 SHO, relocation
HSPA SHO, relocation
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Iur Strategy of Utran Network
Voice+R99 SHO, relocation
Voice+HSPA SHO, relocation
Video SHO, relocation
2.2 Strategy for Inter-frequency Scenario with Iur
2.2.1 Between ZTE and Ericsson
Strategy for Inter-frequency Scenario between ZTE and Ericsson with Iur
Services ZTE -> Ericsson Ericsson ->ZTE
Voice (AMR 12,2kbps) Ue involved relocation Ue involved relocation
PS Release 99 DSCR DSCR
HSDPA DSCR DSCR
Voice+R99 Multi-Rab hold
If Cs release, Ps DSCR
If Ps release, Cs relocation
Ps DSCR
Cs involved relocation
Voice+HSDPA Multi-Rab hold
If Cs release, Ps DSCR
If Ps release, Cs relocation
Ps DSCR
Cs involved relocation
Video Ue involved relocation Ue involved relocation
NOTES: According to the test result from TRT of KPN for inter-frequency scenario,
Ericsson RNC does not support relocation procedure for all kind of PS services. And
there are some unclear issues when HSPA service over Iur interface. And UE will
negative respond when hard handover from ZTE RNC to Ericsson RNC.
2.2.2 Between ZTE and HW
Strategy for Inter-frequency Scenario between ZTE and HW with Iur
Services ZTE -> HW HW ->ZTE
Voice (AMR 12,2kbps) Ue involved relocation Ue involved relocation
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Iur Strategy of Utran Network
PS Release 99 Ue involved relocation Ue involved relocation
HSDPA Fall back to DCH & Ue
involved relocation
Fall back to DCH & Ue
involved relocation
Voice+R99 Ue involved relocation Ue involved relocation
Voice+HSDPA Fall back to DCH & Ue
involved relocation
Fall back to DCH & Ue
involved relocation
Video Ue involved relocation Ue involved relocation
NOTES: Because we had not tested inter-frequency scenario with HW RNC before, we
don’t know is there any issue about HW RNC.
2.2.3 Between ZTE and ZTE
Strategy for Inter-frequency Scenario between ZTE and ZTE with Iur
Services ZTE<->ZTE
Voice (AMR 12.2kbps) Ue involved relocation
PS Release 99 Ue involved relocation
HSPA Ue involved relocation
Voice+R99 Ue involved relocation
Voice+HSPA Ue involved relocation
Video Ue involved relocation
2.3 Strategy for Scenario without Iur
2.3.1 Between ZTE and Ericsson
If there is no Iur connection between ZTE and Ericsson RNC, the strategy is same as
Inter-frequency scenario. Please refer to section 2.2.1.
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Iur Strategy of Utran Network
2.3.2 Between ZTE and HW
If there is no Iur connection between ZTE and HW RNC, the strategy is same as Inter-
frequency scenario. Please refer to section 2.2.12.
2.3.3 Between ZTE and ZTE
If there is no Iur connection between ZTE and ZTE RNC, the strategy is same as Inter-
frequency scenario. Please refer to section Error: Reference source not found3.
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