Content for TR 36.875 Word version: 13.1.0
2 References
3 Definitions, symbols and abbreviations
4 Description of the requirements and functionality for dual connectivity extension
4.1 SIPTO in the dual connectivity
4.2 Location reporting enhancement
4.3 Handover enhancement
4.4 Other enhancement or optimization
4.5 Support of CSG and LIPA for dual connectivity
5 Conclusions
$ Change History
2 References p. 6
3 Definitions, symbols and abbreviations p. 6
3.1 Definitions p. 6
3.2 Abbreviations p. 7
4 Description of the requirements and functionality for dual connectivity extension p. 7
4.1 SIPTO in the dual connectivity p. 7
4.1.1 SIPTO at the Local Network with stand-alone GW for Dual Connectivity p. 7
4.1.2 SIPTO at the Local Network with collocated L-GW for Dual Connectivity p. 9
4.2 Location reporting enhancement p. 11
4.2.1 Introduction p. 11
4.3 Handover enhancement p. 11
4.3.1 Scenarios p. 11
4.3.1.1 Single connectivity to dual connectivity p. 11
4.3.1.2 Dual connectivity to Dual connectivity p. 12
4.3.2 Solutions p. 13
4.4 Other enhancement or optimization p. 17
4.4.1 UE-AMBR coordination over X2 p. 17
4.4.1.1 Introduction p. 17
4.4.1.2 Solutions p. 17
4.4.2 X2-UP flow control p. 19
4.4.3 Handling of User Inactivity p. 19
4.4.3.1 Optimized Setting of user inactivity timer in SeNB p. 19
4.4.3.1.1 Introduction p. 19
4.4.3.1.2 Solutions p. 19
4.4.3.2 Avoid useless Release of SeNB due to user inactivity p. 20
4.4.3.2.1 Introduction p. 20
4.4.3.2.2 Solutions p. 20
4.4.4 Proposed Methods to enhance capacity in the presence of UEs configured with DC and without DC p. 20
4.4.4.1 Problem Statement p. 20
4.4.4.2 Proposed Solutions p. 20
4.4.4.2.1 User Plane solution 1: Bi-directional exchange of UE throughput history throughput information p. 20
4.4.4.2.2 User Plane solution 2: Uni-directional exchange of UE throughput history throughput information p. 24
4.4.4.2.3 Control plane solution: Ensuring provision of minimum QoS by only one eNB involved in DC through coordination between MeNB and SeNB over X2AP p. 24
4.4.4.2.3.1 Description as of reference [8] p. 24
4.4.4.2.3.2 Description as of reference [10] p. 26
4.4.4.2.3.3 Discussion as of reference [9] p. 27
4.4.4.2.4 Applying local RRM strategies based on information available via already specified means p. 28
4.5 Support of CSG and LIPA for dual connectivity p. 29
5 Conclusions p. 35
$ Change History p. 37
