Post on 01-Jun-2018
8/9/2019 UMTS Multi-carrier Deployment Strategy
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UMTS Multi-carrierDeployment Strategy
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Multi-Carriers ScenariosMulti-Carriers Scenarios11
Scenario 1: Two carriersScenario 1: Two carriers
22
Scenario 2: Three carriersScenario 2: Three carriers33
Special Case StudySpecial Case Study55
G900/U900 cooperation planningG900/U900 cooperation planning44
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Multi-Carrier Deployment Scenarios
Scenario 1 Scenario 2
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Multi-Carriers ScenariosMulti-Carriers Scenarios11
Scenario 1: Two carriersScenario 1: Two carriers
22
Scenario 2: Three carriersScenario 2: Three carriers33
Special Case StudySpecial Case Study55
G900/U900 cooperation planningG900/U900 cooperation planning44
8/9/2019 UMTS Multi-carrier Deployment Strategy
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Strategy A : Randomly Camping
F 2
R99+HSPAR99+HSPA
R99+HSPA R99+HSPA
R99+HSPAF 1
Cell reselection
R99+HSPA
R99+HSPA
UE make cellreselection between F1
and F2
2 Carriers scenario
Randomly camping
Service bearer strategy
F1 support R99+HSPA
F2 support R99+HSPA
Service priority are same for both
carriers
Camping Strategy
Camp on F1 an F2 randomly
UE makes cell selection andreselection between F1 and F2
cells
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Mobility of Strategy A
F 2
R99+HSPA
Inter-freq. HHO uni-directional
R99+HSPA
R99+HSPA R99+HSPA
R99+HSPAF 1
Intra-freq. SHO bi-directional
R99+HSPA
R99+HSPA
2 Carriers scenario
Randomly camping
Blind handover bi-directional
Allow intra-frequency handover based on coverage both for F1 & F2;
Allow handover based on coverage only from F2 to F1 at the coverage edge of F2, no
handover based on coverage from F1 to F2;
Configure blind handover neighboring relationships between F1 and F2 cells within thesame coverage range, allow bi-directional blind handover between F1 and F2 in the area
both F1 and F2 covered.
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Loading Balancing For Strategy A
F 2
R99+HSPAR99+HSPA
R99+HSPA R99+HSPA
R99+HSPAF 1 R99+HSPA
R99+HSPA
DRD based on Loading balancing
Inter-freq. Handover based on LDR
Loadin Balancin
2 Carriers scenario
Randomly camping
LDR is activated for both F1 and F2 carriers. LDR
action are:
UL: BE reduction Inter-freq. HHO CS inter-
RAT handover
DL: Codes reshuffling BE reduction Inter-freq.
HHO CS inter-RAT handover
Bi-directional DRD based on loading balancing
(HSDPA users Number) between F1 and F2 is
activated.
To improve the user experiences of R99, DRD for
R99 services are not recommended.
Users will try F1 if rejected by F2, users will try
F2 if rejected by F1.
How to improve the
service success rate of
DRD between F1&F2
cells and improve user
experiences?
Decrease the DRD request times
between two carrier cells are main
solution:
a. Set 5% as the offset of HSPA
users between two carriercells (or higher), thus DRDwill happen only if differenceof HSDPA users between twocarrier cells are larger than5%;
b. Target network for DRD,Ec/No>-12dB;
a enges o u ons
Strategy
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Strategy A Summary
R99+HSPA R99+HSPAR99+HSPA
R99+HSPA
F1
F2 Service bearer strategy
F1 support R99+HSPA
F2 support R99+HSPA
Service priority are same
on both carriers
2 Carriers scenario
Randomly camping
vantages o t s trategy ::::
Good user experiences of HSPA,
access delay is small, HSPA servicesetup success rate is high.
Big capacity space for HSPA services.
sa vantages o t s trategy ::::
Ping-pong cell reselection may exist
between F1 and F2 cells if cellselection and reselection parameters
are not set appropriately. Voice user experiences is not as good
as strategy B.
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Strategy B: Prefer to Camp on F1
Cell reselection
UE back to F1 afterfinishing service on F2
by cell reselection
DRD based on Service
F 2
R99+HSPAR99+HSPA
HSPA+R99 HSPA+R99
R99+HSPAF 1
HSPA+R99
2 Carriers scenario
Prefer to camp on F1
Service bearer strategy
F1 support R99+HSPA,
mainly for R99
F2 support R99+HSPA,
HSPA service is prior
Camping and Access Strategy
Force UE to camp on F1 only, F2 is barred, or configure cell
reselection parameters to make F1 as the first priority to camp
on.
Accept R99 service request on F1, DRD HSPA service to F2.
All the services will access on F1 in the area with F1 coverage
only.
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Mobility of Strategy B2 Carriers scenario
Prefer to camp on F1
F 2
R99+HSPAR99+HSPA
HSPA+R99 HSPA+R99
R99+HSPAF 1
HSPA+R99
Inter-freq. HHO uni-directional
Intra-freq. SHO
Blind handover bi-directional
Allow intra-frequency handover based on coverage both for F1 & F2;
Allow inter-freq HHO based on coverage only from F2 to F1 at the coverage edge of F2, no
handover based on coverage from F1 to F2;
Configure blind handover neighboring relationships between F1 and F2 cells within same coveragerange, allow bi-directional blind handover between F1 and F2 within the area both F1&F2 covered.
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Loading Balancing for Strategy B
F 2
R99+HSPAR99+HSPA
HSPA+R99 HSPA+R99
R99+HSPAF 1
HSPA+R99
Challenges SolutionsLoading Balancing Strategy
2 Carriers scenario
Prefer to camp on F1
DRD based on service will split HSPA
users and R99 users on F2 and F1 carrier.
LDR activated for F1 and F2 carriers
actions of LDR are
UL: BE service reduction inter freq.
HHO CS Inter-RAT Handover
DL: Codes re-shufflingBE reduction
inter freq. HHO CS Inter-RAT Handover
Users with R99 service failured on F1 will
try F2;
How to guarantee the user
experiences in inter-freq.
handover triggered by
LDR?
Ping-pong handover is the main
problem here, ways to solve it:
a. Set 20% as the inter-freq. HHO
loading margin to avoid
the ping-pong handover.
b. Set 200Kbps as the maximum
throughput of users trying inter-freq.
HHO to avoid the big loading
fluctuate in the target cells.
This solution issuitable for all
inter-freq. HHOtriggered by
LDR.
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Strategy B Summary
R99+HSPA
HSPA+R99
F1
F2 Service bearer strategy
R99 prior on F1;
HSPA prior on F2;
Advantages of this Strategy :::: Disadvantages of this Strategy ::::
2 Carriers scenario
Prefer to camp on F1
Development of HSPA service wouldn’thave any impact on R99 services;
No ping-pong cell reselection riskbetween F1 and F2 cells;
setup, HSPA RAB setup success rate islower than strategy a. Will have negativeimpact on Call drop rate.
Normally R99 and H have the differentbusy hour, so frequency resources are not
fully used in most of the time.
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Comparison of two Strategy
Advantages Disadvantages
Randomly Camping
(Strategy )
1. DRD is less, accessibility
KPIs are better;
2. Frequency resources are fully
used.
1. If F2 is not continuously covered, then
inter-freq. hard handover is introduced
for CS services, which has a impact on
the CS users experiences.
2. HSPA service has interference on R99
services.
A
orce o amp on
F1 carrier
(Strategy )
. ess n er erence rom
services to R99 services; No
impact on R99 services with
the introduction of HSPA.
2. No inter-freq. hard handover
for R99 services to improve
the users experiences.
. serv ces nee us serv ce
setup success rate could be lower;
2. Hard handover for HSPA services has
impact on HSPA service experiences.
3. If R99 traffic is too much to bear on
one carrier, then user experiences may
not good.
B
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Strategies Summary
F1 is continuously covered;F2 is also continuously covered;
Randomly CampingWith loading Balancing
AStrategySuggested
F1 is continuously covered;F2 is NOT continuously covered;
Force to camp on F1With service delaminating
BStrategy
Suggested
R99 traffic is less, HSPA traffic isdominated
Randomly CampingWith loading Balancing
AStrategySuggested
R99 traffic can not be influenced Force to camp on F1With service delaminating
StrategySuggested
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Multi-Carriers ScenariosMulti-Carriers Scenarios11
Scenario 1: Two carriersScenario 1: Two carriers
22
Scenario 2: Three carriersScenario 2: Three carriers33
Special Case StudySpecial Case Study55
G900/U900 cooperation planningG900/U900 cooperation planning44
8/9/2019 UMTS Multi-carrier Deployment Strategy
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Strategy :Prefer to Camp on F1
F 2
F 1
UE back to F1 by cellreselection after service
on F2&F3
F 3
Cell reselection
DRD based onService
+R99
R99+HSPAR99+HSPA
+R99 +R99
R99+HSPA
+R99
3 Carriers scenario
Prefer to camp on F1
+R99
Load balance
Service bearer strategy
F1 support R99+HSPA, mainly
for R99
F2 and F3 support HSPA+
R99, HSPA is prior
Camping Strategy
Force UE camp on F1 only, F2&F3 are barred, or
configure cell reselection parameters to make F1 as the
first priority to camp on.
Accept R99 service request on F1, DRD HSPA service
to F2 and F3.
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Mobility Strategy3 Carriers scenario
Prefer to camp on F1
F 2
F 1
F 3
HSPA+R99
R99+HSPAR99+HSPA
HSPA+R99 HSPA+R99
R99+HSPA
HSPA+R99
Inter-freq. HHO uni-directional
Intra-freq. SHO
Blind handover bi-directional
Allow intra-frequency handover based on coverage for all F1, F2 and F3 cells;
Allow inter-freq HHO based on coverage only from F2 to F1 at the coverage edge of F2, no
handover based on coverage from F1 to F2;
Allow inter-freq HHO based on coverage from F3 to F1 and F2 carrier cells, configure higher
priority for F2 compare to F1; No handover based on coverage from F1 to F3&F2;
Allow bi-directional blind handover for all F1, F2 and F3 carrier cells in the same coverage
range.
Configure GSM as neighboring cell both for F1, F2 and F3, only configure F1 as neighboring
cell for GSM.
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Loading Balancing Strategy
F 2
F 1
F 3HSPA+R99
R99+HSPAR99+HSPA
HSPA+R99 HSPA+R99
R99+HSPA
HSPA+R99
3 Carriers scenario
Prefer to camp on F1
In the access phase, accept R99 services on F1,
DRD HSPA services to F2 and F3;
R99 service will DRD to F2 or F3 carriers if service
requests rejected on F1; HSDPA users will setup on
F1 carriers if rejected both by F2&F3.
Set same LDR strategy for all F1, F2&F3 carriers:
UL LDR actions: BE service reduction Inter-freq.
Handover based on LDR CS Inter-RAT handover
DL LDR actions: Codes reshuffling BE reduction
Inter-freq. Handover based on LDR CS Inter-RAT
handover
Challenges Solutions
How to balance the
HSDPA users number onF2 and F3 in access phase?
Step 1: Set same SPG ID for F2 and F3
for HSDPA services
Step 2: Set loading based DRD withHSDPA users number, set the H
users number offset between the
F2 and F3 to be 5%
Strategy
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Strategy Summary
Service bearer strategy
F1 is mainly for R99;
HSPA prior on F2 and F3;
R99+HSPA
HSPA+R99 HSPA+R99
HSPA+ R99F3
F2
F1
3 Carriers scenario
Prefer to camp on F1
::::
Development of HSPA service wouldn’thave any impact on R99 services;
No ping-pong cell reselection risk
between F1 and F2&F3 cells;
::::
DRD are needed for the HSPA servicesetup, HSPA RAB setup success ratewill be lower.
Frequency utilization efficiency is not
high, loading between F1 and F2&F3may not balanced.
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Multi-Carriers ScenariosMulti-Carriers Scenarios11
Scenario 1: Two carriersScenario 1: Two carriers22
Scenario 2: Three carriersScenario 2: Three carriers33
Special Case StudySpecial Case Study55
G900/U900 cooperation planningG900/U900 cooperation planning44
8/9/2019 UMTS Multi-carrier Deployment Strategy
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Coverage capability
Cell Coverage Comparison
Cell Coverage : UMTS 900Mhz 2.5~3 times larger than UMTS 2.1Ghz Radio planning U900 vs G900: Linkbudget +6~9dB, Better receiver sensitivity
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Interference Varies from Site Deployment Pattern
Best mode
G/U Co-Site G/U on different Site
Least Interference High Interference
G/U Co-site solution is preferred regarding interference and TCO
Worst mode
G 900 BTS
U 900 NodeB
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Multi-carrier Strategy in T operator
1900 F2(H+DC)
1900 F1(R99H+DC)
1900 F2(H+DC)
1900 F1(R99H+DC)
1900 F2(H+DC)
1900 F1(R99H+DC)
850 F2(H+DC)
850 F1(R99H+DC)
850 F2(H+DC)
850 F1(R99H+DC) 850 F1(R99H+DC)
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1900 F2(H+DC)
1900 F1(R99H+DC)
850 F1(R99H+DC)
1900 F2(H+DC)
1900 F1(R99H+DC)
850 F1(R99H+DC)
1900 F2(H+DC)
1900 F1(R99H+DC)
850 F1(R99H+DC)
Cell Reselection
Camp on
Not Camp on
Camping Strategy
850 F2(H+DC) 850 F2(H+DC)
User camp on the 850F1/1900F1 in idle mode.
User reselect back to 850F1/1900F1 after the dedicated mode in 850 F2/1900F2
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1900 F2(H+DC)
1900 F1(R99H+DC)
850 F1(R99H+DC)
1900 F2(H+DC)
1900 F1(R99H+DC)
850 F1(R99H+DC)
1900 F2(H+DC)
1900 F1(R99H+DC)
850 F1(R99H+DC)
Intra-FHO
Inter-FHO
Mobility Strategy
850 F2(H+DC) 850 F2(H+DC)
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