multi carrier strategyv1.4
TRANSCRIPT
Multi-carrier Strategy
Multi-carrier Strategy
Multi-carrier Strategy
Version Date Author Approved By Remarks
V0.1 27-04-2011 Fulei Liu Create
V0.2 5-5-2011 Fulei Liu
Put IOT strategy between
ZTE RNC and other
vendors with Iur in section
5.2.
V0.3 10-5-2011 Fulei Liu
Add the comparison of ZTE
strategy in chapter 2 and
current network strategy in
chapter 3 to chapter 3.4.
V0.4 16-5-2011 Fulei LiuUpdate Cons of ZTE
strategy in chapter 3.4.
ZTE Confidential Proprietary © 2023 ZTE Corporation. All rights reserved. 2
© 2023 ZTE Corporation. All rights reserved.ZTE CONFIDENTIAL: This document contains proprietary information of ZTE and is not to be disclosed or used without the prior written permission of ZTE.Due to update and improvement of ZTE products and technologies, information in this document is subjected to change without notice.
Multi-carrier Strategy
TABLE OF CONTENTS
1 OVERVIEW............................................................................................................................... 5
2 ZTE MULTI-CARRIER OPERATION..............................................................................................6
2.1 Scenario..................................................................................................................................6
2.2 Strategy...................................................................................................................................6
2.2.1 Operation Intra 3G..............................................................................................................6
2.2.2 Operation between 3G and GSM........................................................................................8
2.3 Parameters..............................................................................................................................9
3 MULTI-CARRIER STRATEGY IN CURRENT NETWORK.................................................................15
3.1 Scenario................................................................................................................................15
3.2 Strategy.................................................................................................................................15
3.2.1 Operation Intra 3G............................................................................................................15
3.2.2 Operation between 3G and GSM......................................................................................16
3.3 Parameters............................................................................................................................16
3.4 Comparison...........................................................................................................................18
4 INTERWORKING WITH OTHER VENDORS................................................................................20
4.1 Scenario................................................................................................................................20
4.1.1 Intra-frequency Scenario...................................................................................................20
4.1.2 Inter-frequency Scenario...................................................................................................21
4.2 Strategy.................................................................................................................................22
4.3 Parameters............................................................................................................................24
5 APPENDIX.............................................................................................................................. 24
5.1 Multi-carrier strategy after swap..........................................................................................25
5.1.1 Scenario............................................................................................................................25
5.1.2 Strategy............................................................................................................................25
5.1.3 Parameter.........................................................................................................................26
5.2 Interworking with other vendors with Iur.............................................................................27
ZTE Confidential Proprietary © 2023 ZTE Corporation. All rights reserved. 3
Multi-carrier Strategy
FIGURES
Figure 1 Multi-carrier operation of the entire network.................................................6
Figure 2 Multi-carrier operation intra 3G....................................................................6
Figure 3 Multi-carrier operation between 3G and 2G.................................................8
Figure 4 Multi-carrier operation in current network...................................................15
Figure 5 Intra-frequency operation with other vendors.............................................21
Figure 6 1st Inter-frequency operation with other vendors.......................................21
Figure 7 2nd Inter-frequency operation with other vendors......................................22
Figure 8 Multi-carrier strategy after swap.................................................................25
TABLES
Table 1 Related parameter of cell configuration.......................................................9
Table 2 Related parameter of 3G cell reselection...................................................10
Table 3 Related parameter of 2G cell reselection...................................................11
Table 4 Related parameter of load and service balance.........................................12
Table 5 Related parameter of inter-frequency and inter-RAT handover.................12
Table 6 Parameter Settings for ZTE-SRNC to ZTE-DRNC.....................................14
Table 7 Related parameter of cell configuration.....................................................16
Table 8 Related parameter of load and service balance.........................................17
Table 9 Strategy for Intra-frequency between ZTE and Ericsson/HW without Iur...22
Table 10 Strategy for Inter-frequency between ZTE and Ericsson/HW without Iur...23
Table 11 Related parameter of cell configuration.....................................................26
Table 12 Strategy for Intra-frequency between ZTE and Ericsson/HW with Iur........27
Table 13 Strategy for Inter-frequency between ZTE and Ericsson/HW with Iur........28
Table 14 Parameter Settings for ZTE-SRNC to Ericsson/HW-DRNC.......................29
ZTE Confidential Proprietary © 2023 ZTE Corporation. All rights reserved. 4
Multi-carrier Strategy
1 Overview
Chapter 2 provides ZTE multi-carrier strategy, which is used during swap.
Chapter 3 provides multi-carrier strategy of current network, which is implemented by
ZTE configuration.
Chapter 4 presents the IOT strategy between ZTE RNC and other vendors without
Iur.
In the appendix, the multi-carrier strategy after swap is proposed in section 5.1. The
IOT strategy between ZTE RNC and other vendors with Iur is put in section 5.2.
During swap, two multi-carrier strategies are provided in chapter 2 and chapter 3,
ZTE proposes to use ZTE strategy in chapter 2. Which strategy, in chapter 4 or in
chapter 5.2, will be chosen is depended on the test result.
ZTE Confidential Proprietary © 2023 ZTE Corporation. All rights reserved. 5
Multi-carrier Strategy
2 ZTE Multi-carrier operation
2.1 Scenario
Figure 1 Multi-carrier operation of the entire network
2.2 Strategy
2.2.1 Operation Intra 3G
Figure 2 Multi-carrier operation intra 3G
1) Camping and cell reselection
ZTE Confidential Proprietary © 2023 ZTE Corporation. All rights reserved. 6
Multi-carrier Strategy
F1, F2 and F3 are all access layer. UE can camp on any of them according to cell’s
signal quality.
2) Load sharing and traffic distribution
Since three carriers can support R99+HSPA, the load balance is implemented by
inter-frequency cell reselection in idle mode, and there is no service balance.
3) Handover
(a) UE can play intra-frequency handover on each layer F1/F2/F3.
(b) At the boundary of F2/F3, UE hands over to F1.
4) Iur strategy between ZTE SRNC and ZTE DRNC
The intra-frequency and inter-frequency handover strategies via Iur for all kinds of
services are shown below.
Strategy for Intra-frequency between ZTE and ZTE with Iur
Services ZTE <=> ZTE
CS (AMR
12.2kbps)
SHO, relocation
R99 PS SHO, relocation
HSPA SHO, relocation
Voice+R99 SHO, relocation
Voice+HSPA SHO, relocation
Video SHO, relocation
Strategy for Inter-frequency between ZTE and ZTE with Iur
Services ZTE <=> ZTE
CS (AMR
12.2kbps)
HHO, Ue involved relocation
R99 PS HHO, Ue involved relocation
ZTE Confidential Proprietary © 2023 ZTE Corporation. All rights reserved. 7
Multi-carrier Strategy
Services ZTE <=> ZTE
HSPA HHO, Ue involved relocation
Voice+R99 HHO, Ue involved relocation
Voice+HSPA HHO, Ue involved relocation
Video HHO, Ue involved relocation
2.2.2 Operation between 3G and GSM
Figure 3 Multi-carrier operation between 3G and 2G
1) Operation between ZTE F1 and GSM
(a) In IDLE mode, when F1 coverage is bad, UE reselects to GSM. When F1
coverage becomes good, UE reselects back to F1.
(b) For voice call, when F1 coverage is bad, UE can handover to GSM. When UE
finishes its voice call in GSM, it reselects back to ZTE F1
(c) For video call, if both RNC and CN allow video call fallback to CS 12.2k, and UE
has this function too, video call can fall back to CS and then hand over to GSM.
ZTE Confidential Proprietary © 2023 ZTE Corporation. All rights reserved. 8
Multi-carrier Strategy
Otherwise, video call will drop and cannot hand over to GSM. By default, ZTE RNC
allow video call fall back to CS.
(d) For R99 PS, UE can handover to GSM. R99 PS services can reselect back to F1
when the coverage of F1 is good
(e) For HSPA, by ZTE default, HSDPA compressed mode is activated and can go to
GSM directly; While HSUPA falls back to DCH, and compressed mode is activated
and then goes to GSM. There are two parameters to control that.
The neighboring relations between F1 and GSM,
Both GSM900 and GSM1800 exist, F1 configures GSM900 and GSM1800.
GSM900 only exist, F1 configures GSM900.
GSM1800 only exist, F1 configures GSM1800
2) Operation from ZTE F2/F3 to GSM
In some cases, F1 does not have good coverage, so UE need reselect or hand over
to GSM.
2.3 ParametersNotes: (1) The value not presented in tables below uses ZTE default value.
Table 1 Related parameter of cell configuration
ZTE parameter
nameRange ZTE F1 ZTE F2 ZTE F3
HspaSptMeth 0: Not Support
HSUPA and
HSDPA;
1: Support HSDPA
and DCH;
2: Support HSDPA
only;
3: Support
HSUPA , HSDPA
3: Support
HSUPA ,
HSDPA and
DCH;
3: Support
HSUPA , HSDPA
and DCH;
3: Support
HSUPA , HSDPA
and DCH;
ZTE Confidential Proprietary © 2023 ZTE Corporation. All rights reserved. 9
Multi-carrier Strategy
and DCH;
4: Support HSUPA
and HSDPA
ShareCover
0: Neighbor
1: Overlap
2: Covers
3: Contained in
F1-> co-
sector
F2/F3:
1: Overlap
F2-> co-sector
F1/F3:
1: Overlap
(At the boundary)
F2->not-co-
sector F1: 0:
Neighbor
F3-> co-sector
F1/F2:
1: Overlap;
(At the boundary)
F3->not-co-sector
F1: 0: Neighbor
Statemode 0: Idle State Only
1: Cell_DCH State
Only
2: Connected
State, Non-
Cell_DCH
3: Idle State +
Cell_DCH State
4: Idle State +
Connected State,
Non-Cell_DCH
5: Cell_DCH State
+ Connected State,
Non-Cell_DCH
6: Idle State +
Cell_DCH State+
Connected State,
Non-Cell_DCH
F1-> co-
sector
F2/F3: 0
F2-> co-sector
F1/F3: 0
(At the boundary)
F2->not-co-
sector F1: 6
F3-> co-sector
F1/F2: 0
(At the boundary)
F3->not-co-sector
F1: 6
Table 2 Related parameter of 3G cell reselection
ZTE parameter
nameRange ZTE F1 ZTE F2 ZTE F3
QualMeas1: CPICH Ec/No
2: CPICH RSCP
1: CPICH
Ec/No
1: CPICH
Ec/No
1: CPICH
Ec/No
SInterSearchPre0: False
1: True0: False 0: False 0: False
Sintersearch(0..20 )dB Step
2dB10dB 10dB 10dB
OtherRATInfoPre 0: False 1: True 1: True 1: True
ZTE Confidential Proprietary © 2023 ZTE Corporation. All rights reserved. 10
Multi-carrier Strategy
ZTE parameter
nameRange ZTE F1 ZTE F2 ZTE F3
1: True
SSearchRat(0..20 )dB Step
2dB0dB 0dB 0dB
Qqualmin(-24..0)dB step
1dB
-
18dB(current
network -
17dB)
-
18dB(current
network -
17dB)
-18dB(current
network -17dB)
QRxLevMin(-115..-25)dBm
Step2dBm-115dBm -115dBm -115dBm
Qhyst1s(0..40)dB step2
dB
10dB(current
network 4dB)
10dB (current
network 4dB)
10dB(current
network 4dB)
Qhyst2s(0..40)dB step2
dB2dB 2dB 2dB
Qoffset1SNSib11 (-50..50)dB
0dB (F1-
>F2/F3)
0dB
(F2>F1/F3)
0dB
(F3>F1/F2)
0dB
(HW:0dB)
(E: 7dB)
(F1->GSM)
0dB
(HW:0dB)
(E: 7dB)
(F2->GSM)
0dB
(HW:0dB)
(E: 7dB)
(F3->GSM)
Qoffset2SNSib11 (-50..50)dB0dB
(F1->F2/F3)
0dB
(F2>F1/F3)
0dB
(F3>F1/F2)
Table 3 Related parameter of 2G cell reselection
Parameter name Range GSM->3G
Qsearch_I
[0..15]
0 = - 98 dBm, 1 = - 94 dBm, …
,
6 = - 74 dBm, 7 = always
8 = - 78 dBm, 9 = - 74 dBm, …
,
14 = - 54 dBm, 15 = never
7(has 3G
neighbor);
15(do not
have 3G
neighbor)
FDD_Qoffset
[0..15]
0 = always
1 = -28 dB, 2 = -24 dB, … , 15
= 28 dB
0
FDD_Qmin
[0..7]
0= -20dB, 1= -6dB, 2= -18dB,
3= -8dB, 4= -16dB, 5= -10dB,
6= -14dB, 7= -12dB
7= -12dB
ZTE Confidential Proprietary © 2023 ZTE Corporation. All rights reserved. 11
Multi-carrier Strategy
Table 4 Related parameter of load and service balance
ZTE parameter
name
Range ZTE F1 ZTE F2 ZTE F3
InitRrcLBSw 0:Off
1: Inter-frequency Switch On
0 0 0
RabAssLBSw 0: Off
1: Inter- frequency Switch On
2: Inter-system Switch On
3:Inter-frequency and Inter-
system Switch On
0 0 0
CallHoldLBSw 0: Off
1: Inter-frequency Switch On
2: Inter-system Switch On
3: Inter-frequency and Inter-
system Switch On
0 0 0
InitRrcSBSw 0: Off
1: On
0 0 0
RabAssSBSw 0:Off
1: On
0 0 0
CallHoldSBSw 0:Off
1: On
0 0 0
Table 5 Related parameter of inter-frequency and inter-RAT handover
ZTE
parameter
name
Range F1 F2/F3
NonIntraM
easQuan
0: Ec/No
1: RSCP
2: Ec/No and RSCP
2: Ec/No and RSCP 2: Ec/No and RSCP
IfOrRatHo
Swch
0: Turn off Inter-frequency and
Inter-RAT Handover
1: Only Inter Frequency
2: Only Inter RAT
3: Inter Frequency Is Prior to Inter
RAT
2: Only Inter RAT 3: Inter Frequency Is
Prior to Inter RAT
InterHoTa
ctic
0: Algorithm Deciding
1: 2A Event Trigger
2: 2B Event Trigger
3: 2C Event Trigger
/ 1: 2A Event Trigger
InterMeas 0: UE Period Report Parameters 9 7
ZTE Confidential Proprietary © 2023 ZTE Corporation. All rights reserved. 12
Multi-carrier Strategy
ZTE
parameter
name
Range F1 F2/F3
CfgNote
for CPICH Ec/No
3: UE Inter-frequency Event
Report Parameters for CPICH
Ec/No
4: UE Period Report Parameters
for CPICH RSCP
7: UE Inter-frequency Event
Report Parameters for CPICH
RSCP
8: UE Inter-frequency Event
Report Parameters for CPICH
Ec/No(GSM)
9: UE Inter-frequency Event
Report Parameters for CPICH
RSCP(GSM)
ThreshUse
dFreq
CPICH RSCP: (-115..-25 )dBm
step 1dBm
CPICH Ec/No: (-24..0) dB step
1dB
2D/2F:
Voice:2D: -100dBm/-14dB2F: -97dBm/-11dBPS:2D: -110dBm/-15dB2F: -107dBm/-12dB
2D/2F:
Voice:2D: -95dBm/-14dB2F: -92dBm/-11dBPS:2D: -95dBm/-14dB2F: -92dBm/-11dB
ThreshNo
UsedFreq
CPICH RSCP: (-115..-25 )dBm
step 1dBm
CPICH Ec/No: (-24..0) dB step
1dB
/
2E: Voice/PS:2E: -97 dBm/-14dB
Hysteresis (0, 0.5..14.5)dB step 0.5dB 2D/2F:
2D: 2dB2F: 2dB
2A/2D/2F/2E:
2A: 4dB2D: 2dB2E: 4dB2F: 2dB
TrigTime (0, 10, 20, 40, 60, 80, 100, 120,
160, 200, 240, 320, 640, 1280,
2560, 5000)ms
2D/2F:
2D/2F: 640 ms
2A/2D/2F/2E:
2A: 100ms
2E: 100ms
2D/2F: 640 ms
GsmShare
Cover
0: Neighbor;
1: Overlap;
2: Covers;
0: Neighbor (not-co-
site)
1: Overlap(co-site)
0: Neighbor (not-co-
site)
1: Overlap(co-site)
ZTE Confidential Proprietary © 2023 ZTE Corporation. All rights reserved. 13
Multi-carrier Strategy
ZTE
parameter
name
Range F1 F2/F3
3: Contained in
RatHoTact
ic
0: Algorithm Deciding
1: 3A Event Trigger
2: 3C Event Trigger
1: 3A Event Trigger
1: 3A Event Trigger
ThreshCPICH RSCP: (-115..-25 )dBm
step 1dBm
3A:
Voice/PS3A: -95 dBm/-14dB
3A:
Voice/PS3A: -95 dBm/-14dB
ThreshSysCPICH RSCP: (-115..-25 )dBm
step 1dBm
3A:
Voice/PS3A: -102 dBm
3A:
Voice/PS3A: -102 dBm
HsdpaCm
AssoMode
0: Serial
1: Parallel1: Parallel 1: Parallel
HsupaCm
AssoMode
0: Serial
1: Parallel0: Serial 0: Serial
Cs64RbM
odeSwch
0: Not Support SCUDIF
1: Support SCUDIF, CS64
Service Established by a RB
1: Support SCUDIF,
CS64 Service
Established by a RB
1: Support SCUDIF,
CS64 Service
Established by a RB
Table 6 Parameter Settings for ZTE-SRNC to ZTE-DRNC
ZTE parameter name Name on the Interface ZTE<=> ZTE Default
Value
RncFeatSwitch0 Hard-handover With Relocation 0 0
RncFeatSwitch1 Support HSDPA Iur Interface Process 1 1
RncFeatSwitch2 Support HSUPA Iur Interface Process 1 1
RncFeatSwitch4 Support Hard Handover DSCR 0 0
RncFeatSwitch7 Use DSCR for PS service when UE all RLs
need moved to DRNC
0 0
RNCFeatSwitch10 Support UE not Involved Relocation for
CS Service
1 1
RNCFeatSwitch11 Support UE not Involved Relocation for
PS Service
1 1
Notes: Parameters in table 6 can be used for intra- and inter-frequency with Iur scenarios.
ZTE Confidential Proprietary © 2023 ZTE Corporation. All rights reserved. 14
Multi-carrier Strategy
3 Multi-carrier strategy in current network
3.1 Scenario
Figure 4 Multi-carrier operation in current network
3.2 Strategy
3.2.1 Operation Intra 3G
1) Camping in idle mode
F1 is the access layer. UE can camp on F1 only.
F2 and F3 are barred. No UE can access to them.
In this case, only F1 works in idle mode.
2) Load sharing and traffic distribution
F1 supports R99+HSPA and it is set as R99 preferred.
F2 and F3 support R99+HSPA and they are set as HS preferred.
ZTE Confidential Proprietary © 2023 ZTE Corporation. All rights reserved. 15
Multi-carrier Strategy
Since all three carriers support R99+HSPA and F1 is access layer, load balance
feature needs to be activated. Due to traffic of R99 and HS are distributed to different
carriers, service balance also needs to be used.
In current network, HS redirection happens during RAB assignment. Therefore,
during 1st RAB assignment, the behavior of each category of UE on F1 are listed
below,
When R99 UE initiates voice call or R99 PS, it stays on F1.
When R5/R6+ UE initiate CS only, it will be kept on F1. When R5/R6+ UE initiate
HS only, it might be moved from F1 to F2/F3 depending on the load of F1/F2/F3.
If R5/R6+ UE with HS on F2/F3 initials another CS RAB, the UE with multi-RAB
will be kept on F2/F3 and does not handover to F1. If UE releases HS first, then
UE with CS only will not be moved to F1 by ZTE default.
3) Handover
Refer to section 2.2.1.
4) Iur strategy between ZTE SRNC and ZTE DRNC
Refer to section 2.2.1.
3.2.2 Operation between 3G and GSM
Refer to section 2.2.2.
3.3 Parameters
Notes: Other parameters refer to section 2.3.
ZTE Confidential Proprietary © 2023 ZTE Corporation. All rights reserved. 16
Multi-carrier Strategy
Table 7 Related parameter of cell configuration
ZTE
parameter
name
Range ZTE F1 ZTE F2 ZTE F3
CellBarredIn
d
1: Barred
2: Not Barred2 1 1
TBarred(10,20,40,80,160,320,640,1280)
s10s 10s 10s
HspaSptMeth
0: Not Support HSUPA and
HSDPA;
1: Support HSDPA and DCH;
2: Support HSDPA only;
3: Support HSUPA , HSDPA and
DCH;
4: Support HSUPA and HSDPA
3:
Support
HSUPA ,
HSDPA
and
DCH;
3: Support
HSUPA , HSDPA
and DCH;
3: Support
HSUPA , HSDPA
and DCH;
ShareCover
0: Neighbor
1: Overlap
2: Covers
3: Contained in
F1-> co-
sector
F2/F3:
1:
Overlap
F2-> co-sector
F1:
1: Overlap
(At the boundary)
F2->not-co-
sector F1: 0:
Neighbor
F3-> co-sector F1
1: Overlap;
(At the boundary)
F3->not-co-
sector F1: 0:
Neighbor
Statemode 0: Idle State Only
1: Cell_DCH State Only
2: Connected State, Non-
Cell_DCH
3: Idle State + Cell_DCH State
4: Idle State + Connected State,
Non-Cell_DCH
5: Cell_DCH State + Connected
State, Non-Cell_DCH
6: Idle State + Cell_DCH State+
Connected State, Non-Cell_DCH
F1-> co-
sector
F2/F3: 1
F2-> co-sector
F1: 0
(At the boundary)
F2->not-co-
sector F1: 6
F3-> co-sector
F1: 0
(At the boundary)
F3->not-co-
sector F1: 6
Table 8 Related parameter of load and service balance
ZTE parameter
name
Range ZTE F1 ZTE F2 ZTE F3
InitRrcLBSw 0:Off 0 0 0
ZTE Confidential Proprietary © 2023 ZTE Corporation. All rights reserved. 17
Multi-carrier Strategy
ZTE parameter
name
Range ZTE F1 ZTE F2 ZTE F3
1: Inter-frequency Switch On
RabAssLBSw 0: Off1: Inter- frequency Switch On2: Inter-system Switch On 3:Inter-frequency and Inter-system Switch On
1 0 0
CallHoldLBSw 0: Off1: Inter-frequency Switch On2: Inter-system Switch On3: Inter-frequency and Inter-system Switch On
0 0 0
DlLdBalPwrSwch 0: Off
1: On
0 0 0
LdBalCdSwch 0: Off
1: On
0 0 0
UlLdBalPwrSwch 0: Off
1: On
0 0 0
LdBalHsSwch 0: Off
1: On
1 0 0
DlLdBalHsWeight (0..100%) step 1% 100% 0% 0%
DlLdHsThdHsd (0..100%) 80% 80% 80%
ExtraCDeltaHsTrd (0..100%) 5% 0% 0%
InitRrcSBSw 0: Off 1: On
0 0 0
RabAssSBSw 0:Off1: On
1 0 0
CallHoldSBSw 0:Off1: On
0 0 0
PrefTrafType
Bit0=0/1: CS No Preferred / CS PreferredBit1=0/1: R99 PS No Preferred / R99 PS PreferredBit2=0/1: HS PS No Preferred / HS PS PreferredBit3~Bit7: Reversed, fixed to 0
Bit0=1Bit1=1Bit2=0Bit3~Bit7=0
Bit0=0Bit1=0Bit2=1Bit3~Bit7=0
Bit0=0Bit1=0Bit2=1Bit3~Bit7=0
CsHo4MulRab 0:Off 0 0 0
ZTE Confidential Proprietary © 2023 ZTE Corporation. All rights reserved. 18
Multi-carrier Strategy
ZTE parameter
name
Range ZTE F1 ZTE F2 ZTE F3
Swch 1: On
3.4 Comparison This chapter presents the pros and cons of ZTE strategy in chapter 2 and current
network strategy in chapter 3.
Pros Cons
ZTE
strategy
1. Idle mode: three carriers can absorb
users, especially, at the airport or
harbor, operators has more chance to
attract users.
2. CELL_DCH: No RRC or RAB
redirection (Load/service balance), no
impact on user successful access rate
and no blind handover call drop
3. Result: number of users on each
carrier is almost same. The load is
almost balanced on each carrier.
4. This network structure is not
influenced by traffic and UE type
changes and can be used in many
different situations. For example,
currently, voice is more and PS is less;
but in future, voice decreases and PS
increases.
5. Use case: several commercial
networks choose it, for example, in
Compared with “Current network
strategy”, co –sector F2 and F3 are
required to have neighboring relations
with each other in this strategy.
ZTE Confidential Proprietary © 2023 ZTE Corporation. All rights reserved. 19
Multi-carrier Strategy
Europe and HK.
Current
network
strategy
Load can be balanced from F1 to F2
and F3.
Service can be redirected to F2 and F3.
1. Idle mode: Since F2 and F3 are barred,
only F1 can be used to absorb users.
2. Since F2 and F3 are barred, UE will
periodically try to camp on F2/F3 and read
F2/F3 system information, and later
reselect to F1, which is controlled by a
timer (Tbarred). In this case, UE
consumes powers to make useless
behavior. Moreover, it is need to test and
check whether all categories of UE can
make correct behavior after reading
“Barred”.
3. CELL_DCH: During RAB assignment,
there is service redirection which is blind
handover and will impact inter-frequency
call drop rate.
4. If voice is more than PS in current
network, F1 might be easy to be
congested and more voice need to be
redirected to F2/F3 which increase call
drop rate. Moreover, when Voice
redirection occurs and if UEA1 encryption
is enabled, water sound occurs.
ZTE Confidential Proprietary © 2023 ZTE Corporation. All rights reserved. 20
Multi-carrier Strategy
4 Interworking with other vendors
4.1 ScenarioSince the whole network is swapped cluster by cluster, the scenarios that intra- or
inter- frequency operations may exist between ZTE and Ericsson/HW.
4.1.1 Intra-frequency Scenario One typical scenario of intra-frequency operations is shown below.
Figure 5 Intra-frequency operation with other vendors
4.1.2 Inter-frequency Scenario Two typical scenarios of inter-frequency operations are shown below.
ZTE Confidential Proprietary © 2023 ZTE Corporation. All rights reserved. 21
UMTS 2100 F1
Intra-frequency handover with other vendor
ZTE UMTS 2100 F2
ZTE UMTS 2100 F1
UMTS 2100 F2
ZTE UMTS 2100 F3
R99+HSPA
R99+HSPA
UMTS 2100 F3R99+HSPA
E/H UMTS 2100 F2
E/H UMTS 2100 F1
E/H UMTS 2100 F3
ZTE RNCE/H RNC
Multi-carrier Strategy
Figure 6 1st Inter-frequency operation with other vendors
Figure 7 2nd Inter-frequency operation with other vendors
4.2 StrategyThe strategy between ZTE and Ericsson/HW will use operation without Iur, that is to
say, Iur interface is deactivated between ZTE RNC and Ericsson/HW RNC. It should
be pointed that strategies below depend on test results. Some in tables might be
ZTE Confidential Proprietary © 2023 ZTE Corporation. All rights reserved. 22
UMTS 2100 F1
Intra-frequency handover with other vendor
ZTE UMTS 2100 F2
ZTE UMTS 2100 F1
UMTS 2100 F2
ZTE UMTS 2100 F3
R99+HSPA
R99+HSPA
UMTS 2100 F3R99+HSPA
E/H UMTS 2100 F2
E/H UMTS 2100 F1
E/H UMTS 2100 F3
ZTE RNCE/H RNC
Inter-frequency handover with other vendor
UMTS 2100 F1
Intra-frequency handover with other vendor
ZTE UMTS 2100 F2
ZTE UMTS 2100 F1
UMTS 2100 F2
ZTE UMTS 2100 F3
R99+HSPA
R99+HSPA
UMTS 2100 F3R99+HSPA
E/H UMTS 2100 F2
E/H UMTS 2100 F1
E/H UMTS 2100 F3
ZTE RNCE/H RNC
Inter-frequency handover with other vendor
Multi-carrier Strategy
modified according to test results because it also depends on the software version of
other vendors.
Table 9 Strategy for Intra-frequency between ZTE and Ericsson/HW without Iur
Services ZTE =>
Ericsson
ZTE<=
Ericsson
ZTE=> HW ZTE<=HW
Voice (AMR
12.2kbps)
HHO,
Ue involved
relocation
HHO,
Ue involved
relocation
HHO,
Ue involved
relocation
HHO,
Ue involved
relocation
R99 PS DSCR DSCR HHO,
Ue involved
relocation
HHO,
Ue involved
relocation
HSPA DSCR DSCR Fall back to DCH
& relocation
Fall back to DCH &
relocation
Voice+R99 Cs release, Ps
DSCR
Ps release, Cs
relocation
Cs release, Ps
DSCR
Ps release, Cs
relocation
Ue involved
relocation
Ue involved
relocation
Voice+HSPA Cs release, Ps
DSCR
Ps release, Cs
relocation
Cs release, Ps
DSCR
Ps release, Cs
relocation
Fall back to DCH
& Ue involved
relocation
Fall back to DCH &
Ue involved
relocation
Video HHO, Ue
involved
relocation
HHO, Ue
involved
relocation
HHO, Ue involved
relocation
HHO, Ue involved
relocation
Table 10 Strategy for Inter-frequency between ZTE and Ericsson/HW without Iur
Services ZTE => EricssonZTE<= Ericsson ZTE=> HW ZTE<=HW
Voice (AMR HHO, Ue HHO, Ue HHO, Ue HHO, Ue
ZTE Confidential Proprietary © 2023 ZTE Corporation. All rights reserved. 23
Multi-carrier Strategy
12.2kbps) involved
relocation
involved
relocation
involved
relocation
involved
relocation
R99 PS DSCR DSCR HHO, Ue
involved
relocation
HHO, Ue
involved
relocation
HSPA DSCR DSCR Fall back to
DCH & Ue
involved
relocation
Fall back to
DCH & Ue
involved
relocation
Voice+R99 HHO
Cs release, Ps
DSCR
Ps release, Cs
relocation
HHO
Ps DSCR
Cs relocation
Ue involved
relocation
Ue involved
relocation
Voice+HSPA HHO
Cs release, Ps
DSCR
Ps release, Cs
relocation
HHO
Ps DSCR
Cs relocation
Fall back to
DCH & Ue
involved
relocation
Fall back to
DCH & Ue
involved
relocation
Video Ue involved
relocation
Ue involved
relocation
Ue involved
relocation
Ue involved
relocation
4.3 ParametersIntra-frequency handover parameters refer to current network.
Inter-frequency handover parameters refer to table 5.
5 APPENDIX
ZTE Confidential Proprietary © 2023 ZTE Corporation. All rights reserved. 24
Multi-carrier Strategy
5.1 Multi-carrier strategy after swap
5.1.1 Scenario
Figure 8 Multi-carrier strategy after swap
5.1.2 Strategy
A. Intra 3G
1) Camping and cell reselection
F1, F2 and F3 are all access layer. UE can camp on any of them according to cell’s
signal quality.
2) Load sharing and traffic distribution
Since three carriers can support R99+HSPA, the load balance is implemented by
inter-frequency cell reselection in idle mode, and there is no service balance.
3) Handover
(a) UE can play intra-frequency handover on each layer F1/F2/F3.
ZTE Confidential Proprietary © 2023 ZTE Corporation. All rights reserved. 25
Multi-carrier Strategy
(b) At the boundary of F3, UE hands over to F1, which is as same as that during
swap in section 2.2.1.In this way, there is no need to modify inter-frequency
neighboring relations.
B. Between 3G and 2G
Refer to section 2.2.2.
5.1.3 Parameter
Table 11 Related parameter of cell configuration
ZTE parameter
nameRange ZTE F1 ZTE F2 ZTE F3
HspaSptMeth
0: Not Support
HSUPA and
HSDPA;
1: Support HSDPA
and DCH;
2: Support HSDPA
only;
3: Support
HSUPA , HSDPA
and DCH;
4: Support HSUPA
and HSDPA
3: Support
HSUPA ,
HSDPA and
DCH;
3: Support
HSUPA , HSDPA
and DCH;
3: Support
HSUPA , HSDPA
and DCH;
ShareCover
0: Neighbor
1: Overlap
2: Covers
3: Contained in
F1-> co-
sector
F2/F3:
1: Overlap
F2-> co-sector
F1/F3:
1: Overlap
F3-> co-sector
F1/F2:
1: Overlap;
(At the boundary)
F3->not-co-sector
F1: 0: Neighbor
ZTE Confidential Proprietary © 2023 ZTE Corporation. All rights reserved. 26
Multi-carrier Strategy
ZTE parameter
nameRange ZTE F1 ZTE F2 ZTE F3
Statemode 0: Idle State Only
1: Cell_DCH State
Only
2: Connected
State, Non-
Cell_DCH
3: Idle State +
Cell_DCH State
4: Idle State +
Connected State,
Non-Cell_DCH
5: Cell_DCH State
+ Connected State,
Non-Cell_DCH
6: Idle State +
Cell_DCH State+
Connected State,
Non-Cell_DCH
F1-> co-
sector
F2/F3: 0
F2-> co-sector
F1/F3: 0
F3-> co-sector
F1/F2: 0
(At the boundary)
F3->not-co-sector
F1: 6
Notes: (1) Other parameters refer to section 2.3. (2) In table 5, the inter-RAT
handover parameters of F2 refer to that of F1.
ZTE Confidential Proprietary © 2023 ZTE Corporation. All rights reserved. 27