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Content for  TR 37.803  Word version:  11.2.0

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2 References  3 Definitions, symbols and abbreviations  4 Existing Mobility Functionality  5 Use cases and Requirements for enhanced mobility  6 Enhanced Mobility: description and analysis of the different architectural options  7 Conclusions and Recommendations  $ Change history 

 

2  References  p. 7

3  Definitions, symbols and abbreviations  p. 8

3.1  Definitions  p. 8

3.2  Symbols  p. 8

3.3  Abbreviations  p. 8

4  Existing Mobility Functionality  p. 8

4.1  UMTS  p. 8

4.1.1  Mobility Functions supported  p. 8

4.1.2  Architecture  p. 9

4.1.3  Assumption Baseline  p. 10

4.2  LTE  p. 10

4.2.1  Mobility Functions supported  p. 10

4.2.2  Architecture  p. 11

4.2.3  Assumption Baseline  p. 13

5  Use cases and Requirements for enhanced mobility  p. 14

5.1  UMTS  p. 14

5.1.1  Use cases  p. 14

5.2  LTE  p. 16

5.2.1  Use cases  p. 16

6  Enhanced Mobility: description and analysis of the different architectural options  p. 16

6.1  UMTS architectural topics  p. 16

6.1.1  Enhanced Mobility in CELL_FACH, CELL_PCH and URA_PCH  p. 17

6.1.1.1  Problems to be solved.  p. 17

6.1.1.1.1  CELL_FACH mobility Support for CSG-capable UEs  p. 17
6.1.1.1.1.2  Measuring of inter-frequency CSG cells in CELL_FACH state  p. 17
6.1.1.1.2  Target HNB acquiring the UE context from the source HNB.  p. 17
6.1.1.1.3  Support for mixed HNB releases.  p. 18

6.1.1.2  Possible solutions  p. 18

6.1.1.2.1  CELL_FACH mobility Support for CSG-capable UEs  p. 18
6.1.1.2.1.2  Measuring of inter-frequency CSG cells in CELL_FACH state  p. 18
6.1.1.2.1.3  System Information Block reading of target CSG cell(s) in CELL_FACH state  p. 19
6.1.1.2.2  Target acquiring UE context from the source HNB  p. 20
6.1.1.2.3  Support for mixed HNB releases  p. 39

6.1.1.3  Comparison of solutions  p. 40

6.1.1.3.1  Narrative summary of solutions advantages/disadvantages  p. 40
6.1.1.3.3  Comparison Table  p. 43

6.1.1.4  Agreed Way Forward  p. 44

6.1.2  Enhanced Mobility with macro network  p. 44

6.1.2.1  Macro to Open HNB Enhanced Hard Handover Mobility  p. 44

6.1.2.1.1  Problem Definition  p. 44
6.1.2.1.2  Possible Solutions  p. 45
6.1.2.1.3  Agreed Way Forward  p. 46

6.1.2.2  Macro to Hybrid HNB Enhanced Hard Handover Mobility  p. 46

6.1.2.2.1  Problem Definition  p. 46
6.1.2.2.2  Possible Solutions  p. 47
6.1.2.2.3  Solutions Comparison  p. 55
6.1.2.2.4  Agreed Way Forward  p. 57

6.1.2.3  SHO between HNB and Macro  p. 58

6.1.2.3.1  HNB to Macro Soft Handover  p. 59
6.1.2.3.2  Macro to Open HNB Soft Handover  p. 61
6.1.2.3.3  Macro to Hybrid HNB Soft Handover  p. 62
6.1.2.3.3.2  Possible Solutions  p. 63
6.1.2.3.4  Evaluation  p. 64

6.1.3  Legacy UE mobility  p. 64

6.1.3.1  Problem Statement  p. 64

6.1.3.2  Scope  p. 67

6.1.3.2.1  Use case scenario  p. 67
6.1.3.2.2  Hybrid and Open HNBs  p. 67
6.1.3.2.3  CSG HNBs  p. 67
6.1.3.2.4  Status Quo  p. 68

6.1.3.3  Options  p. 68

6.1.3.3.1  Option 1: Disambiguation at HNB-GW  p. 68
6.1.3.3.1.1  -  p. 68
6.1.3.3.1.1.1  Source Cell  p. 68
6.1.3.3.1.1.2  Timing Difference (DOTD)  p. 69
6.1.3.3.1.1.3  C-PICH matching  p. 69
6.1.3.3.1.1.4  Signalling  p. 70
6.1.3.3.1.1.5  Inter-frequency handover  p. 70
6.1.3.3.1.2  Option 1b: Disambiguation at HNB-GW based on UL detection at HNB sub-system(UE UL PSC/UE UL DPCCH/target PSC)  p. 70
6.1.3.3.1.2.1  Signalling  p. 71
6.1.3.3.1.3  Option 1c: Disambiguation at HNB-GW(UE UL detection + ΔOTD Filtering)  p. 71
6.1.3.3.2  Option 2: Disambiguation at Serving RNC  p. 72
6.1.3.3.2.3  Signalling  p. 75
6.1.3.3.2.4.1  Option 2c, Step 1: Construction of HNB database in the macro cell RNC  p. 76
6.1.3.3.2.4.2  Option 2c, Step 2: Best match activity (disambiguation) executed by the RNC  p. 76
6.1.3.3.2.4.3  Considerations on Option 2c  p. 77

6.1.3.4  Discussion  p. 77

6.1.3.4.1  Parameters for Disambiguation  p. 78
6.1.3.4.2  Node Impact  p. 78
6.1.3.4.3  Interface Impact  p. 80
6.1.3.4.4  Specification Impact  p. 80

6.2  LTE architectural topics  p. 81

6.2.1  Void

6.2.2  Enhanced Mobility with macro network  p. 81

6.2.2.1  Issue 1: Macro → Open HeNB  p. 81

6.2.2.2  Issue 2: Membership Verification  p. 82

6.2.3  Support of X2 via GW proxy  p. 86

6.2.3.1  Problem Statement  p. 86

6.2.3.2  Full X2-Proxy  p. 86

6.2.3.2.1  Full X2-Proxy definition  p. 86
6.2.3.2.2  Logical architecture  p. 86
6.2.3.2.3  Detailed call flows  p. 87
6.2.3.2.4  Handling X2 procedures in X2-proxy  p. 88
6.2.3.2.5  Impact to eNB/HeNB  p. 90
6.2.3.2.6  Possible spec changes  p. 90
6.2.3.2.7  Comparison  p. 91
6.2.3.2.8  Open issues  p. 91
6.2.3.2.8.8  Handling of resource status request message in the proxy (the X2 proxy needs to split it?, etc…)  p. 93

6.2.3.3  X2 Routing Proxy Alternative  p. 101

6.2.3.3.1  X2 Setup  p. 102
6.2.3.3.2  Other X2 procedures  p. 104
6.2.3.3.3  Summary  p. 104
6.2.3.3.4  Open Issues  p. 105

6.2.3.4  Support of X2 via an SCTP Concentrator  p. 105

6.2.3.4.1  Logical Architecture  p. 105
6.2.3.4.2  Functions  p. 105
6.2.3.4.3  Protocol Stack  p. 106
6.2.3.4.4  Leveraging SCTP Multi-Streaming  p. 106
6.2.3.4.5  Autonomous X2 Setup through the SCTP Concentrator  p. 107
6.2.3.4.5.1  X2 Setup from HeNB to eNB  p. 107
6.2.3.4.5.2  X2 Setup from eNB to HeNB  p. 107
6.2.3.4.6  Open Issues  p. 108
6.2.3.4.6.1  ANR Impact on OAM  p. 108
6.2.3.4.6.2  Handling multiple peers connected to the same (H)eNB  p. 108
6.2.3.4.6.3  Impact on Current SCTP Stack  p. 108
6.2.3.4.6.4  Impact on Current Specifications  p. 109

6.3  Inter-CSG Mobility  p. 109

6.4  RAN Sharing  p. 109

6.4.1  Issue 1: Determining set of PLMN id(s) for which the UE is a member for HO to a CSG cell which is advertising multiple PLMN-ids  p. 109

6.4.2  Issue 2: Architecture for network sharing for H(e)NB  p. 112

6.4.3  Impact analysis and comparison for issue 1  p. 113

6.4.4  Conclusion  p. 114

7  Conclusions and Recommendations  p. 114

7.1  UMTS topics  p. 114

7.2  LTE Topics  p. 115

$  Change history  p. 116

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