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New Handoff Management for D2D Communication inLong Term Evolution-Advanced Cellular Network
Mohammad Dabibi
University of Tehran
December 12, 2014
Mohammad Dabibi (University Of Tehran) D2D Handover December 12, 2014 1 / 34
Headline
1 Introduction to Device To Device CommunicationProximity Discovery and AwarnessClassification of D2D CommunicationCurrent Progress in Standardization
2 LTE-A Access, Core and Procotol Architecture for D2DD2D Function Block in LTE-A SAE ArchitectureProtocol Stock and Bearer ManagementCommunication SenariosD2D Connection Request/Setup
3 Handover ThechnologyTarget Cell SelectionX2 Backhauling and Handover Using X2Proposed LTE handover using D2D
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What is D2D?
Direct Communication Between Nearby Mobiles.
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How To Get Proximity Awareness?
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Discovery And Broadcast
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User Experience Cont’n
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User Experience Cont’n
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Classifiation of D2D Communication
• Licensed Band: Better interference avoidance under a controlledenvironment. Ex. Femtocells / Picocells Under LTE-Alicensed band
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Current Progress in D2D Communication
• June 2011: Study item description on the radio aspect of D2Ddescovery and Communication by Qualcomm
• Augest 2011: Direct over-the-air LTE D2D discovery andCommunication
• June 2012: Identified potential requirements between proximate devicesas new step on Rel-12
• December 2012: Study on LTE Proximity Service in radio AccessNetwork ( D2D Discovery - D2D Communication )
• Current Work On: Discovery Signal design, Resource Allocation andScheduling, Synchronization mechanism.
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D2D Function Block in LTE-A SAE Architecture
• ProSe: Proximity Discovery - Direct Communication• D2D Sessions: D2D session Could be initiated by sending an initiation
request to the Proximity Server in MME.• Radio Bearer Setup (Ud): MME is responsible for initiating Ud
interface.
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D2D Function Block in LTE-A SAE Architecture Cont’n
• Radio Bearer Setup (Ud): MME is responsible for initiating Udinterface + Delivery IP address for D2D terminal devices.
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Protocol Stock and Bearer Management
• Data Protocol Stock for D2D: D2D bearer has been set up betweenpeer devices.
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D2D Design Aspect
• Modulation Format: LTE use SC-FDMA for UL and OFDMA in DL. IfSC-FDMA is used, the D2D UE needs to be equipped with anew SC-FDMA receiver.
• Frame Structure: Camping D2D on UL resources
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D2D Design Aspect Cont’n
• Channel Measurements: Based on measurement reports
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LTE-A Access, Core and Protocol Architecture for D2D
• D2D Communication Scenarios Direct Communication
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D2D Ennhanced LTE Architecture
• New Interfaces PC1, PC2, PC3, PC4, PC5, PC6 and SGi
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Security Architecture for D2D
• Main Security Feature:
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D2D Connection Request
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Handover Technologies
• Hard Handover break-before-make• Soft Handover make-before-break• handover procedure: measurements control, the measurements report,
handover decision, handover execution
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Handover Process ( handover Decision )
Handover process may betriggered by:
1 Quality, filed strength ofDistance Values fallbellow/exceed theirthreshold
2 Periodic Check : PowerBudget HO, Umbrella HO
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Handover Priority
• Handover Priority
1 Uplink and downlink Interference
2 Uplink Quality
3 Downlink Quality
4 Uplink Level
5 Downlink Level
6 Distance
7 Rapid Field Drop
8 Slow moving UE
9 Better Cell, i.e Periodic Check ( power Budget HO or Umbrella HO
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Handover in LTE-A
• Hard Handover High handover outage probability, Large Delay.
• Aspect on D2D To Provide Steamless access to Voice and Multimediaservice with Strict delay in D2D
• Solution 1. Semi-Soft-Handover 2. Handover Using D2DCommunication
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Backhauling X2
• X2 The LTE Radio Access Network moves RNC functionality rothe eNodeB and introduced a new X2
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LTE X2 Handover High Level Flow
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LTE X2 Handover High Level Flow Cont’n
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Proposed LTE D2D Handover
• Proposed: Handover During D2D Communication via Ud
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Proposed LTE D2D Handover High Level Flow
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References
T. S. Rappaport
Wireless communications, Prentice Hall, 1996
C. Lin, K. Sandrasegaran and S. Reeves
Handover Algorithm with Joint Processing in LTE-Advanced 2012 IEEE
J. Chang, Y. Li, Sh. Feng, H. Wang, C. Sun, Ph. Zhang
A Fractional Soft Handover Scheme for 3GPP LTE-Advanced System, IEEEInternational Conference, 2009.
M. Anas, F. D.Calabrese, P. E. Mogensen, C. Rosa, K. I. Pedersen
Performance Evaluation of Received Signal Strength Based Hard Handover forUTRAN LTE, IEEE Vehicular Technology Conference, 2007, pp.1046-1050.
K. Doppler, M. Rinne, C. Wijting, C. Ribeiro, and K. Hugl
Deviceto-device communication as an underlay to lte-advanced networks,Communications Magazine, IEEE, vol. 47, no. 12, pp. 4249, 2009.
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