gsm umts lte inter-worki
DESCRIPTION
LTETRANSCRIPT
Slide 1Huawei Confidential
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Basic Information:
Target audience:
Time: - up to 45 min
Author: - Wang Wei (ID# 53756) / Chen Zheng (ID# 00139370)
Version: - V1.0 (02 Sep, 2009)
Content / Main Opinion:
This PPT focus on why inter-working solution is needed and how it will bring benefit to operators, Huawei’s understanding and solution will be stated in following aspects: .
Why we need inter-working? Analyze the demand from industry and operator aspects;
What scenarios are included in inter-working?
Pros and Cons of all 3GPP standard & non-standard inter-working solutions;
Highlight Huawei’s special voice over LTE solution and its unique value;
Summary: how inter-working help operator solve their challenges.
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Please pay attention on ‘forbidden to submit to customer’ pages!
HUAWEI TECHNOLOGIES CO., LTD.
www.huawei.com
Huawei GSM/UMTS/LTE Inter-working Solution
HUAWEI TECHNOLOGIES CO., LTD.
Huawei Confidential
Slide title :32-35pt Color: R153 G0 B0 Corporate Font : FrutigerNext LT Medium Font to be used by customers and partners : Arial Slide text :20-22pt Bullets level 2-5: 18pt Color:Black Corporate Font : FrutigerNext LT Medium Font to be used by customers and partners : Arial
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Content
This slide has 3 parts.
Part1 : By analyzing mobile market trend and challenges, with the limitation of UE and spectrum, we give the conclusion “LTE will forces on hot spot in initial phase,
So many different technologies will co-exist .
Part2 : Introduce the industry solution and Huawei innovative solution, we try to get out the conclusion that Huawei has more advanced or innovative solution to solve the interworking.
Part3 : give the interworking strategy in different phase, what benefits can Huawei solutions bring to operators.
HUAWEI TECHNOLOGIES CO., LTD.
Huawei Confidential
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Trend of global mobile market
Technologies of different generations will co-exist for a long time;
Voice service keeps creating huge revenue for operators;
Main revenue growth will come from data services;
Revenues (US$bn)
Source: Informa Telecoms & Media
Content: Introduce the trend of global mobile market,
1 Technologies of different generations will co-exist for a long time
2 Voice service keeps creating huge revenue for operators;
3 Main revenue growth will come from data services;
HUAWEI TECHNOLOGIES CO., LTD.
Huawei Confidential
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LTE Network Challenges
Provider
Flexible Third Party Cooperation
*
Content: There are some challenges for LTE deployment, can be summarized into below 4 categories
1, Industrial maturity, there are
2, LTE deployment will affect existing basic voice and SMS service, how to ensure smooth multi network inter-operation
3, how to control the cost of LTE deployment, save site construction cost, save backhaul expansion cost, save O&M cost for multi-network
4, How to make the LTE investment profitable, resolve the operators problem, create more profit with LTE technology,
HUAWEI TECHNOLOGIES CO., LTD.
Huawei Confidential
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LTE Deployment Strategy
Urban / rural in
expanding / mature phase
More spectrum available
Convergent PS Core
Load sharing strategy
Service based mobility
Limited spectrum options
Independent EPC to minimize impact on CN
Keep service continuity via 2G/3G network
No impact on the stability of 2G/3G network
Enable seamless service experience between LTE and G/U systems.
Hot spot / dense urban in initial phase
Content: Introduce the LTE deployment strategy in different phase
“Independent EPC”MMEGW
HUAWEI TECHNOLOGIES CO., LTD.
Huawei Confidential
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Impact of LTE introduction
Change on existing NE;
High end user experience
Service continuity and diversity;
Focus on hotspot and dense urban in initial phase;
According to the industrial maturity , when the operators deploy the LTE network, they concern on the four factors, and most of these concerns can be solved by GUL interworking solution.
HUAWEI TECHNOLOGIES CO., LTD.
Huawei Confidential
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Content
Huawei Confidential
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Target of GSM/UMTS/LTE Inter-working
Avoid the impact on the GSM/UMTS network stability;
Voice service introduced;
Introduce the target of interworking in different phases.
In this section, we divide the whole package into 3GPP standard solutions and Huawei Special solution. When giving customer a overall understanding about GUL interworking solution, we also need to highlight our special solution which can bring unique value for operator and subscribers.
Huawei Confidential
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GSM/UMTS/LTE Inter-working Scenarios
CS Fall Back
This slides shows us all scenarios of interworking.
There are only two status for an UE in LTE network, Idle and RRC connected, and in each of them, we will meet different needs of interworking.
* PS handover: adoptable for G/L and U/L interworking;
** CCO (eNACC and non eNACC): only for G/L interworking;
The Comparison of PS Handover and CCO:
1The Interrupt time of the PS handover is shorter, Better User experience (HO).
2towards network and UE side, the method of the CCO than the PS handover is simpler to perform (CCO).
HUAWEI TECHNOLOGIES CO., LTD.
Huawei Confidential
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Section 1, Camping and Cell Reselection
HUAWEI TECHNOLOGIES CO., LTD.
Huawei Confidential
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UE Camping & Cell Reselection Principle
GSM/UMTS/LTE multi-mode UE camp on LTE network preferentially in idle mode;
Cell reselection of LTEGSM/UMTS is triggered only when UE is out of LTE coverage area;
Cell reselection of GSM/UMTSLTE is triggered when UE enters the LTE coverage area;
LTE Hotspot
GSM/UMTS Coverage
Cell Reselection from GSM/UMTS to LTE network
Cell Reselection from LTE to GSM/UMTS network
Introduce the principle of idle mode hand reselection, LTE has the highest priority.
UE will reselect GU network when the UE is out of LTE converge. Once UE gets back to LTE coverage, it will reselect to LTE network.
HUAWEI TECHNOLOGIES CO., LTD.
Huawei Confidential
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Priority and Threshold
UE Individual priority;
Default Common Priority is: LTE>UMTS>GSM;
Threshold and Measurement:
Measurement parameter:
SNonServingCell: Signal quality of target reselection cell;
Cell Reselection Strategy:
SServingCell <Threshserving,low & SNonServingCell> Threshx,low
GSM/UMTS->LTE (Low to High):
SNonServingCell> Threshx,high
LTE
GSM
UMTS
This slides show Priority and Threshold of Cell selection and reselection, which determines when and by measuring of what parameters, one multi-mode UE will trigger the selection/reselection and the request will be approved.
Huawei Confidential
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Section 2, Data Service Inter-working
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Huawei Confidential
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Data Service Initiation
LTE UE with the highest priority when UE attached in overlaid RAN area;
eUTRAN is preferable to provide data service;
Minimum impact on the legacy GSM/UMTS network;
Guarantee data speed of LTE subscribers;
LTE
Coverage
HO is allowed in case of load pressure;
Data service request
LTE network bears service preferably;
Principle
Benefit
Main principle of data service activation a still UE in GU/LTE overlaid coverage, with different camping situation. LTE network is preferable for providing data service.
LTE
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Data Service Mobility Solution
UE handovers to GSM/UMTS;
Data service handover
Ongoing data service is beared by G/U;
UE moves into LTE coverage area, two options for data continuity:
Service handover to LTE directly;
Service is still provided by G/U network, when service ends, UE will camp on LTE network by cell reselection;
Support cell reselection between eUTRAN and GERAN/UTRAN;
LTE to GSM/UMTS PS handover based on coverage in initial phase;
Guarantee users’ data service quality when handover occurs;
Keep network performance stable and service continuity;
Principle
Benefit
Main principle of data service handover based on coverage for a moving UE with data service.
Pay attention to handover from GU to LTE:
GSM,UMTS->LTE: option1: when the UE supports Common Priority LTE>UMTS>GSM, Service handover to LTE directly .
option2: when the UE does not support Common Priority LTE>UMTS>GSM ,Service is still provided by GU network, when service ends, UE will camp on LTE network by cell reselection.
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Huawei Confidential
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Flow Chart of Data Service Handover
Data service handover procedure:
New Service Bearer
The source eNodeB decides to initiate a handover to the target access network. MME sends relocation request to G/U SGSN;
G/U SGSN sends relocation request to target BSC/RNC for resource preparation; MME inform S-GW to prepare handover.
eNodeB informs UE to handover from eUTRAN to G/U network. UE apply reconfiguration in G/U network;
BSC/RNC allocate resource for UE and MME releases occupied resource of eNodeB.
HO request
Relocation request
Relocation request
Gn
The simple flow chart of data service handover from LTE to GU network, based on coverage.
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Section 3, Voice Service Inter-working
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Mobility Tactics for Voice Service in LTE
CS Fallback
Others
Solution
LTE UE’s voice service will be pushed back to 2G/3G CS domain; A handover procedure from LTE to 2G/3G is performed in order to allow the UE for handling over 2G/3G network;
LTE UE uses voice over IMS when being under LTE coverage; Handover from LTE to 2G/3G CS domain is triggered when UE is leaving the LTE coverage (SR-VCC mechanism); Voice calls continue over 2G/3G CS domain;
Some industry players are investigating other choices (e.g. P2P VoIP, VoLGA Forum); however there is no guarantee that it will be standardized by 3GPP
Briefly introducing main stream solution to provide voice service in an LTE network.
Attention:
HUAWEI TECHNOLOGIES CO., LTD.
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CS Fall Back Solution for Voice
Voice service can be deployed quickly and minimize new investment;
Guarantee users’ data service quality when handover occurs;
GSM/UMTS has the highest priority to provide voice service for multi-mode UE;
If CSFB voice service initiated, two options for the pre-existing LTE data service:
Service handed over to GSM/UMTS network (DTM supported by GU network);
Service suspended in LTE network until voice call is over (DTM not supported);
GSM/UMTS coverage
Core network requirement:
No additional equipment;
CSFB solution is suitable for operator with 2G/3G/4G network simultaneously.
The voice service request of multi-mode UE will be pushed to GU network CS domain.
Pay attention to data service options when CSFB initiated.
LTECSFBLTE
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Flow Chart of CS Fallback for Voice - MO
BSC/RNC
eNodeB
SAE-GW
2G/3G
LTE
MSC/VLR
SGs
HSS/HLR
1, Voice service request is activated from UE;
2, MME indicates UE fall back to G/U network for voice service via eNodeB, UE sends service request to GERAN/UTRAN; in the mean time, MME informs G/U CS Core to prepare resource;
3, When resource in G/U network is allocated, UE falls back to GERAN/UTRAN for voice service;
MO flow.
There is no need to add hardware to support CSFB,it needs to add the SGs interface between MME and MSC.
CSFBMMEMSCSGsCSFB
Huawei Confidential
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Flow Chart of CS Fallback for Voice - MT
BSC/RNC
eNodeB
SAE-GW
2G/3G
LTE
MSC/VLR
SGs
HSS/HLR
CSFB MT procedure:
1, GSM/UMTS MSC initiates CS paging to the called party (LTE UE), voice service is requested by LTE UE;
2, MME indicates UE fall back to GERAN/UTRAN for voice service via eNodeB, UE sends service request to GERAN/UTRAN; in the mean time, MME informs GSM/UMTS CS Core to prepare resource;
3, When resource in GSM/UMTS network is allocated, UE falls back to GERAN/UTRAN for voice service;
MT flow
There is no need to add hardware to support CSFB,it needs to add the SGs interface between MME and MSC.
CSFBMMEMSCSGsCSFB
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SRVCC Solution for Voice
LTE
hotspot
LTE network can support both voice and data services with IMS solution;
Future oriented Convergent solution;
PS handover for LTE VoIP to UMTS VoIP;
SRVCC for LTE VoIP to GSM/UMTS CS calls if VoIP is not supported by G/U network;
When UE moving from LTE coverage to GSM/UMTS with voice service…
Core network requirement:
SRVCC (Single Radio Voice Call Continuity):
It needs to add VCC AS, as well as IMS core to support and process signalings, also MSC needs to upgrade to EMSC.
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Flow Chart of SRVCC for Voice
BTS/NodeB
Voice service handover procedure:
2, MME transfers the data request signal to SGSN and voice request signal to EMSC.
3, Data and voice service requests are sent to BSC/RNC and data/voice resources are prepared for taking over UE’s service. BSC/RNC sends the response signal from EMSC/SGSN to MME/eNodeB;
4, UE handover from LTE coverage to GSM/UMTS coverage, voice service continuity guaranteed. After handover succeeded, the occupied resource in LTE will be released.
1, Voice service is beared by LTE. E-UTRAN indicates MME for SRVCC.
X
SAE-GW
eNodeB
Flow chart of SRVCC solution
* VCC AS: Voice Call Continuity Application Server. (Huawei product of VCC AS is CSE9600)
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VANC Solution Tunnel Concept
No need to deploy the IMS
No impact on legacy 2G/3G MSC but VANC must be introduced
Utilization of the Sv interface defined in TS23.216 for voice handover to 2G/3G CS core when UE going out of LTE coverage
Provide the Rx/Gx interfaces with PCRF for dedicated bearer establishment for voice
Founded in March 2009
Need to support VANC client (registration to VANC GW)
Need to support Sv itf for HO to 2G/3G CS domain when leaving LTE coverage
Need to support VANC GW to emulate Iu-cs/A interfaces towards 2G/3G CS core network
Principles
S5
S3
S11
Network
VANC:
3GPP TS43.318 Generic Access Network (GAN) provide the solution which utilize the generic IP access network like WLAN, WiFi and introduce the new equipment VANC to meet the demand of voice, SMS and other CS services. We can also introduce this solution to LTE.
A 3GPP GAN Controller (VANC) has been modified to support CS services over LTE as specified by the VoLGA forum. Now, VoLGA (Voice over LTE via Generic Access) team focuses on the specific technique about VANC solution and plan to introduce it into 3GPP release 9.
The following picture is the VANC solution for voice. The dedicate bearer for signaling is established when UE initially registers to the VANC. And VANC working as an AF and transmit service information to the PCRF via Rx interface, according to the service information PCRF will generate some PCC rules and apply them to PCEF in PGW, the PCEF will execute the PCC rules and initiated dedicated bearer procedure for voice.
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VANC principle for voice continuity
S5
E-UTRAN
S-GW
PDN-GW
PCRF
LTE-Uu
S1-U
S1-MME
S3
SV
S11
PSTN or PLMN
Pre-condition: UE is registered to CS domain via VANC transparent for EPS
UE initiates call towards the EPS
e-UTRAN initiates HO
VANC:
3GPP TS43.318 Generic Access Network (GAN) provide the solution which utilize the generic IP access network like WLAN, WiFi and introduce the new equipment VANC to meet the demand of voice, SMS and other CS services. We can also introduce this solution to LTE.
A 3GPP GAN Controller (VANC) has been modified to support CS services over LTE as specified by the VoLGA forum. Now, VoLGA (Voice over LTE via Generic Access) team focuses on the specific technique about VANC solution and plan to introduce it into 3GPP release 9.
The following picture is the VANC solution for voice. The dedicate bearer for signaling is established when UE initially registers to the VANC. And VANC working as an AF and transmit service information to the PCRF via Rx interface, according to the service information PCRF will generate some PCC rules and apply them to PCEF in PGW, the PCEF will execute the PCC rules and initiated dedicated bearer procedure for voice.
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Comparison of Different Solution
Solution
CSFB
IMS/SRVCC
VANC
Complete standardization as part of 3GPP R8 March 2009
Complete standardization as part of 3GPP R8 March 2009
Development via VoLGA Forum No 3GPP support (up to now) IPR issues
Application Scenario
Without IMS deployment; LTE network doesn’t provide VoIP service. Note: Take advantage of legacy network’s voice ability.
With IMS deployment; LTE network provide VoIP service; Favoring “convergence” scenarios among fixed and mobile;
Without IMS deployment; LTE network provide VoIP service with additional VANC equipment. Note: Take advantage of legacy network’s voice ability.
Solution Complexity
Low Legacy network doesn’t need modification. LTE network identify the voice service and fall back to CS domain.
High IMS should be deployed. Legacy network and LTE network are both connected to IMS.
Medium Add VANC equipment. Convert the Voip to CS.
Performance
Call setup time needs few seconds which is longer than voice call over 2G/3G.
Low time consumption of Tuning and Assignment to UTRAN in handover.
Long routing across LTE, SAE and CS Core Domain for voice packets.
Terminal Requirement
High Dual-mode terminal should support VoIP and related IMS signaling
Medium Dual-mode terminal should support VoIP and VANC signaling.
Bief comparison of these voice solutions.
We can find that: If we can optimize Call setup time, the CSFB solution will be much closer to be perfect.
Then here comes the Huawei’s Optimized CSFB solution.
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Huawei’s Optimized CSFB Solution
Just for reference, not suitable for all customers
The plan of the optimized CSFB solution is not clear ,if using the solution ,please confirm with the author
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Optimized CSFB: Provide high quality voice service
IMS/SRVCC
Less CS handover
Time than SRVCC
Less Latency, Better User Experience
Optimized
CSFB
CSFB
Content: Introduce Huawei solution for voice over LTE
Industrial initial solution for voice over LTE is CSFB and IMS/SRVCC, but each of these 2 solution is not very satisfying.
Huawei develop a new features named Optimized CSFB, eliminate the weak point of these 2 function and combined the advantages.
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Flow Chart of Optimized CSFB for Voice
Optimized CSFB voice solution procedure:
Keep existing CSFB for UE paging and measurement (in GERAN/UTRAN);
Enhance Service Request Message with CSFB and SRVCC indicator for triggering SRVCC procedure;
HO request and resource allocation will be handled with SRVCC procedure;
UE will be tuned to 2G/3G network, service will be beared by GERAN/UTRAN;
BTS/NodeB
Bearer before handover
Bearer after handover
Flow chart of optimized CSFB solution.
We combine advantages of both CSFB and SRVCC solution to balance network deployment cost and user experience.
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Value of Optimized CSFB Solution
Performance of this enhanced CSFB could be equivalent to or even better than native 2/3G CS call.
No IMS Deployment is needed as a mandatory requirement for SRVCC;
Only MSCs in surrounding area need to be upgraded;
Smooth migration path from CSFB to future IMS based SRVCC;
Performance Improvement Comparison
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Content
Summary
Because of flat architecture and more advanced technologies, LTE can support higher peak data rate, larger throughputs, and better user experiences.
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Huawei E2E Inter-working Solution
Target
Flexible and enhanced handover strategy
Huawei provides complete inter-working solution according to customer’s deployment strategy
Milestone
10~12 LTE operators are expected to launch commercial service in 2010……..
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Benefits to Operator
Smooth path for future convergence;
Step by step strategy
From Data to Voice;
3
4
G/U/L
Inter
-working
2
1
Minimize workload of topology modification and inter-connection;
Thank you
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Direction of the slides
Generally, only PDF file is to be submitted to customers.
If any questions, comments or concerns, please contact the authors or the modifiers.
Basic Information:
Target audience:
Time: - up to 45 min
Author: - Wang Wei (ID# 53756) / Chen Zheng (ID# 00139370)
Version: - V1.0 (02 Sep, 2009)
Content / Main Opinion:
This PPT focus on why inter-working solution is needed and how it will bring benefit to operators, Huawei’s understanding and solution will be stated in following aspects: .
Why we need inter-working? Analyze the demand from industry and operator aspects;
What scenarios are included in inter-working?
Pros and Cons of all 3GPP standard & non-standard inter-working solutions;
Highlight Huawei’s special voice over LTE solution and its unique value;
Summary: how inter-working help operator solve their challenges.
This page should be deleted before presentation
Please pay attention on ‘forbidden to submit to customer’ pages!
HUAWEI TECHNOLOGIES CO., LTD.
www.huawei.com
Huawei GSM/UMTS/LTE Inter-working Solution
HUAWEI TECHNOLOGIES CO., LTD.
Huawei Confidential
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Content
This slide has 3 parts.
Part1 : By analyzing mobile market trend and challenges, with the limitation of UE and spectrum, we give the conclusion “LTE will forces on hot spot in initial phase,
So many different technologies will co-exist .
Part2 : Introduce the industry solution and Huawei innovative solution, we try to get out the conclusion that Huawei has more advanced or innovative solution to solve the interworking.
Part3 : give the interworking strategy in different phase, what benefits can Huawei solutions bring to operators.
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Trend of global mobile market
Technologies of different generations will co-exist for a long time;
Voice service keeps creating huge revenue for operators;
Main revenue growth will come from data services;
Revenues (US$bn)
Source: Informa Telecoms & Media
Content: Introduce the trend of global mobile market,
1 Technologies of different generations will co-exist for a long time
2 Voice service keeps creating huge revenue for operators;
3 Main revenue growth will come from data services;
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LTE Network Challenges
Provider
Flexible Third Party Cooperation
*
Content: There are some challenges for LTE deployment, can be summarized into below 4 categories
1, Industrial maturity, there are
2, LTE deployment will affect existing basic voice and SMS service, how to ensure smooth multi network inter-operation
3, how to control the cost of LTE deployment, save site construction cost, save backhaul expansion cost, save O&M cost for multi-network
4, How to make the LTE investment profitable, resolve the operators problem, create more profit with LTE technology,
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LTE Deployment Strategy
Urban / rural in
expanding / mature phase
More spectrum available
Convergent PS Core
Load sharing strategy
Service based mobility
Limited spectrum options
Independent EPC to minimize impact on CN
Keep service continuity via 2G/3G network
No impact on the stability of 2G/3G network
Enable seamless service experience between LTE and G/U systems.
Hot spot / dense urban in initial phase
Content: Introduce the LTE deployment strategy in different phase
“Independent EPC”MMEGW
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Impact of LTE introduction
Change on existing NE;
High end user experience
Service continuity and diversity;
Focus on hotspot and dense urban in initial phase;
According to the industrial maturity , when the operators deploy the LTE network, they concern on the four factors, and most of these concerns can be solved by GUL interworking solution.
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Content
Huawei Confidential
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Target of GSM/UMTS/LTE Inter-working
Avoid the impact on the GSM/UMTS network stability;
Voice service introduced;
Introduce the target of interworking in different phases.
In this section, we divide the whole package into 3GPP standard solutions and Huawei Special solution. When giving customer a overall understanding about GUL interworking solution, we also need to highlight our special solution which can bring unique value for operator and subscribers.
Huawei Confidential
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GSM/UMTS/LTE Inter-working Scenarios
CS Fall Back
This slides shows us all scenarios of interworking.
There are only two status for an UE in LTE network, Idle and RRC connected, and in each of them, we will meet different needs of interworking.
* PS handover: adoptable for G/L and U/L interworking;
** CCO (eNACC and non eNACC): only for G/L interworking;
The Comparison of PS Handover and CCO:
1The Interrupt time of the PS handover is shorter, Better User experience (HO).
2towards network and UE side, the method of the CCO than the PS handover is simpler to perform (CCO).
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Section 1, Camping and Cell Reselection
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UE Camping & Cell Reselection Principle
GSM/UMTS/LTE multi-mode UE camp on LTE network preferentially in idle mode;
Cell reselection of LTEGSM/UMTS is triggered only when UE is out of LTE coverage area;
Cell reselection of GSM/UMTSLTE is triggered when UE enters the LTE coverage area;
LTE Hotspot
GSM/UMTS Coverage
Cell Reselection from GSM/UMTS to LTE network
Cell Reselection from LTE to GSM/UMTS network
Introduce the principle of idle mode hand reselection, LTE has the highest priority.
UE will reselect GU network when the UE is out of LTE converge. Once UE gets back to LTE coverage, it will reselect to LTE network.
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Priority and Threshold
UE Individual priority;
Default Common Priority is: LTE>UMTS>GSM;
Threshold and Measurement:
Measurement parameter:
SNonServingCell: Signal quality of target reselection cell;
Cell Reselection Strategy:
SServingCell <Threshserving,low & SNonServingCell> Threshx,low
GSM/UMTS->LTE (Low to High):
SNonServingCell> Threshx,high
LTE
GSM
UMTS
This slides show Priority and Threshold of Cell selection and reselection, which determines when and by measuring of what parameters, one multi-mode UE will trigger the selection/reselection and the request will be approved.
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Section 2, Data Service Inter-working
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Data Service Initiation
LTE UE with the highest priority when UE attached in overlaid RAN area;
eUTRAN is preferable to provide data service;
Minimum impact on the legacy GSM/UMTS network;
Guarantee data speed of LTE subscribers;
LTE
Coverage
HO is allowed in case of load pressure;
Data service request
LTE network bears service preferably;
Principle
Benefit
Main principle of data service activation a still UE in GU/LTE overlaid coverage, with different camping situation. LTE network is preferable for providing data service.
LTE
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Data Service Mobility Solution
UE handovers to GSM/UMTS;
Data service handover
Ongoing data service is beared by G/U;
UE moves into LTE coverage area, two options for data continuity:
Service handover to LTE directly;
Service is still provided by G/U network, when service ends, UE will camp on LTE network by cell reselection;
Support cell reselection between eUTRAN and GERAN/UTRAN;
LTE to GSM/UMTS PS handover based on coverage in initial phase;
Guarantee users’ data service quality when handover occurs;
Keep network performance stable and service continuity;
Principle
Benefit
Main principle of data service handover based on coverage for a moving UE with data service.
Pay attention to handover from GU to LTE:
GSM,UMTS->LTE: option1: when the UE supports Common Priority LTE>UMTS>GSM, Service handover to LTE directly .
option2: when the UE does not support Common Priority LTE>UMTS>GSM ,Service is still provided by GU network, when service ends, UE will camp on LTE network by cell reselection.
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Flow Chart of Data Service Handover
Data service handover procedure:
New Service Bearer
The source eNodeB decides to initiate a handover to the target access network. MME sends relocation request to G/U SGSN;
G/U SGSN sends relocation request to target BSC/RNC for resource preparation; MME inform S-GW to prepare handover.
eNodeB informs UE to handover from eUTRAN to G/U network. UE apply reconfiguration in G/U network;
BSC/RNC allocate resource for UE and MME releases occupied resource of eNodeB.
HO request
Relocation request
Relocation request
Gn
The simple flow chart of data service handover from LTE to GU network, based on coverage.
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Section 3, Voice Service Inter-working
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Mobility Tactics for Voice Service in LTE
CS Fallback
Others
Solution
LTE UE’s voice service will be pushed back to 2G/3G CS domain; A handover procedure from LTE to 2G/3G is performed in order to allow the UE for handling over 2G/3G network;
LTE UE uses voice over IMS when being under LTE coverage; Handover from LTE to 2G/3G CS domain is triggered when UE is leaving the LTE coverage (SR-VCC mechanism); Voice calls continue over 2G/3G CS domain;
Some industry players are investigating other choices (e.g. P2P VoIP, VoLGA Forum); however there is no guarantee that it will be standardized by 3GPP
Briefly introducing main stream solution to provide voice service in an LTE network.
Attention:
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CS Fall Back Solution for Voice
Voice service can be deployed quickly and minimize new investment;
Guarantee users’ data service quality when handover occurs;
GSM/UMTS has the highest priority to provide voice service for multi-mode UE;
If CSFB voice service initiated, two options for the pre-existing LTE data service:
Service handed over to GSM/UMTS network (DTM supported by GU network);
Service suspended in LTE network until voice call is over (DTM not supported);
GSM/UMTS coverage
Core network requirement:
No additional equipment;
CSFB solution is suitable for operator with 2G/3G/4G network simultaneously.
The voice service request of multi-mode UE will be pushed to GU network CS domain.
Pay attention to data service options when CSFB initiated.
LTECSFBLTE
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Flow Chart of CS Fallback for Voice - MO
BSC/RNC
eNodeB
SAE-GW
2G/3G
LTE
MSC/VLR
SGs
HSS/HLR
1, Voice service request is activated from UE;
2, MME indicates UE fall back to G/U network for voice service via eNodeB, UE sends service request to GERAN/UTRAN; in the mean time, MME informs G/U CS Core to prepare resource;
3, When resource in G/U network is allocated, UE falls back to GERAN/UTRAN for voice service;
MO flow.
There is no need to add hardware to support CSFB,it needs to add the SGs interface between MME and MSC.
CSFBMMEMSCSGsCSFB
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Flow Chart of CS Fallback for Voice - MT
BSC/RNC
eNodeB
SAE-GW
2G/3G
LTE
MSC/VLR
SGs
HSS/HLR
CSFB MT procedure:
1, GSM/UMTS MSC initiates CS paging to the called party (LTE UE), voice service is requested by LTE UE;
2, MME indicates UE fall back to GERAN/UTRAN for voice service via eNodeB, UE sends service request to GERAN/UTRAN; in the mean time, MME informs GSM/UMTS CS Core to prepare resource;
3, When resource in GSM/UMTS network is allocated, UE falls back to GERAN/UTRAN for voice service;
MT flow
There is no need to add hardware to support CSFB,it needs to add the SGs interface between MME and MSC.
CSFBMMEMSCSGsCSFB
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SRVCC Solution for Voice
LTE
hotspot
LTE network can support both voice and data services with IMS solution;
Future oriented Convergent solution;
PS handover for LTE VoIP to UMTS VoIP;
SRVCC for LTE VoIP to GSM/UMTS CS calls if VoIP is not supported by G/U network;
When UE moving from LTE coverage to GSM/UMTS with voice service…
Core network requirement:
SRVCC (Single Radio Voice Call Continuity):
It needs to add VCC AS, as well as IMS core to support and process signalings, also MSC needs to upgrade to EMSC.
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Flow Chart of SRVCC for Voice
BTS/NodeB
Voice service handover procedure:
2, MME transfers the data request signal to SGSN and voice request signal to EMSC.
3, Data and voice service requests are sent to BSC/RNC and data/voice resources are prepared for taking over UE’s service. BSC/RNC sends the response signal from EMSC/SGSN to MME/eNodeB;
4, UE handover from LTE coverage to GSM/UMTS coverage, voice service continuity guaranteed. After handover succeeded, the occupied resource in LTE will be released.
1, Voice service is beared by LTE. E-UTRAN indicates MME for SRVCC.
X
SAE-GW
eNodeB
Flow chart of SRVCC solution
* VCC AS: Voice Call Continuity Application Server. (Huawei product of VCC AS is CSE9600)
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VANC Solution Tunnel Concept
No need to deploy the IMS
No impact on legacy 2G/3G MSC but VANC must be introduced
Utilization of the Sv interface defined in TS23.216 for voice handover to 2G/3G CS core when UE going out of LTE coverage
Provide the Rx/Gx interfaces with PCRF for dedicated bearer establishment for voice
Founded in March 2009
Need to support VANC client (registration to VANC GW)
Need to support Sv itf for HO to 2G/3G CS domain when leaving LTE coverage
Need to support VANC GW to emulate Iu-cs/A interfaces towards 2G/3G CS core network
Principles
S5
S3
S11
Network
VANC:
3GPP TS43.318 Generic Access Network (GAN) provide the solution which utilize the generic IP access network like WLAN, WiFi and introduce the new equipment VANC to meet the demand of voice, SMS and other CS services. We can also introduce this solution to LTE.
A 3GPP GAN Controller (VANC) has been modified to support CS services over LTE as specified by the VoLGA forum. Now, VoLGA (Voice over LTE via Generic Access) team focuses on the specific technique about VANC solution and plan to introduce it into 3GPP release 9.
The following picture is the VANC solution for voice. The dedicate bearer for signaling is established when UE initially registers to the VANC. And VANC working as an AF and transmit service information to the PCRF via Rx interface, according to the service information PCRF will generate some PCC rules and apply them to PCEF in PGW, the PCEF will execute the PCC rules and initiated dedicated bearer procedure for voice.
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VANC principle for voice continuity
S5
E-UTRAN
S-GW
PDN-GW
PCRF
LTE-Uu
S1-U
S1-MME
S3
SV
S11
PSTN or PLMN
Pre-condition: UE is registered to CS domain via VANC transparent for EPS
UE initiates call towards the EPS
e-UTRAN initiates HO
VANC:
3GPP TS43.318 Generic Access Network (GAN) provide the solution which utilize the generic IP access network like WLAN, WiFi and introduce the new equipment VANC to meet the demand of voice, SMS and other CS services. We can also introduce this solution to LTE.
A 3GPP GAN Controller (VANC) has been modified to support CS services over LTE as specified by the VoLGA forum. Now, VoLGA (Voice over LTE via Generic Access) team focuses on the specific technique about VANC solution and plan to introduce it into 3GPP release 9.
The following picture is the VANC solution for voice. The dedicate bearer for signaling is established when UE initially registers to the VANC. And VANC working as an AF and transmit service information to the PCRF via Rx interface, according to the service information PCRF will generate some PCC rules and apply them to PCEF in PGW, the PCEF will execute the PCC rules and initiated dedicated bearer procedure for voice.
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Comparison of Different Solution
Solution
CSFB
IMS/SRVCC
VANC
Complete standardization as part of 3GPP R8 March 2009
Complete standardization as part of 3GPP R8 March 2009
Development via VoLGA Forum No 3GPP support (up to now) IPR issues
Application Scenario
Without IMS deployment; LTE network doesn’t provide VoIP service. Note: Take advantage of legacy network’s voice ability.
With IMS deployment; LTE network provide VoIP service; Favoring “convergence” scenarios among fixed and mobile;
Without IMS deployment; LTE network provide VoIP service with additional VANC equipment. Note: Take advantage of legacy network’s voice ability.
Solution Complexity
Low Legacy network doesn’t need modification. LTE network identify the voice service and fall back to CS domain.
High IMS should be deployed. Legacy network and LTE network are both connected to IMS.
Medium Add VANC equipment. Convert the Voip to CS.
Performance
Call setup time needs few seconds which is longer than voice call over 2G/3G.
Low time consumption of Tuning and Assignment to UTRAN in handover.
Long routing across LTE, SAE and CS Core Domain for voice packets.
Terminal Requirement
High Dual-mode terminal should support VoIP and related IMS signaling
Medium Dual-mode terminal should support VoIP and VANC signaling.
Bief comparison of these voice solutions.
We can find that: If we can optimize Call setup time, the CSFB solution will be much closer to be perfect.
Then here comes the Huawei’s Optimized CSFB solution.
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Huawei’s Optimized CSFB Solution
Just for reference, not suitable for all customers
The plan of the optimized CSFB solution is not clear ,if using the solution ,please confirm with the author
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Optimized CSFB: Provide high quality voice service
IMS/SRVCC
Less CS handover
Time than SRVCC
Less Latency, Better User Experience
Optimized
CSFB
CSFB
Content: Introduce Huawei solution for voice over LTE
Industrial initial solution for voice over LTE is CSFB and IMS/SRVCC, but each of these 2 solution is not very satisfying.
Huawei develop a new features named Optimized CSFB, eliminate the weak point of these 2 function and combined the advantages.
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Flow Chart of Optimized CSFB for Voice
Optimized CSFB voice solution procedure:
Keep existing CSFB for UE paging and measurement (in GERAN/UTRAN);
Enhance Service Request Message with CSFB and SRVCC indicator for triggering SRVCC procedure;
HO request and resource allocation will be handled with SRVCC procedure;
UE will be tuned to 2G/3G network, service will be beared by GERAN/UTRAN;
BTS/NodeB
Bearer before handover
Bearer after handover
Flow chart of optimized CSFB solution.
We combine advantages of both CSFB and SRVCC solution to balance network deployment cost and user experience.
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Value of Optimized CSFB Solution
Performance of this enhanced CSFB could be equivalent to or even better than native 2/3G CS call.
No IMS Deployment is needed as a mandatory requirement for SRVCC;
Only MSCs in surrounding area need to be upgraded;
Smooth migration path from CSFB to future IMS based SRVCC;
Performance Improvement Comparison
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Content
Summary
Because of flat architecture and more advanced technologies, LTE can support higher peak data rate, larger throughputs, and better user experiences.
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Huawei E2E Inter-working Solution
Target
Flexible and enhanced handover strategy
Huawei provides complete inter-working solution according to customer’s deployment strategy
Milestone
10~12 LTE operators are expected to launch commercial service in 2010……..
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Benefits to Operator
Smooth path for future convergence;
Step by step strategy
From Data to Voice;
3
4
G/U/L
Inter
-working
2
1
Minimize workload of topology modification and inter-connection;
Thank you