Tech-invite 3GPPspace IETFspace

21 22 23 24 25 26 27 28 29 31 32 33 34 35 36 37 38 4‑5x

Content for TR 25.872 Word version: 11.0.0

0… 2…

2 References p. 6

3 Definitions, symbols and abbreviations p. 6

3.1 Definitions p. 6

3.2 Symbols p. 7

3.3 Abbreviations p. 7

4 Objectives of the HSDPA Multipoint Transmission Study p. 7

5 Descriptions of the HSDPA Multipoint Transmission Concepts p. 8

5.1 Single point data transmission p. 8

5.1.1 HS-DDTx p. 8

5.1.2 SF-DC Switching p. 8

5.1.3 DF-4C Switching p. 8

5.2 Multiflow data transmission p. 9

5.2.1 SF-DC Aggregation p. 9

5.2.2 DF-DC Aggregation p. 9

5.2.3 DF-4C Aggregation p. 10

5.3 Single Frequency Network data transmission p. 10

5.3.1 HS-SFN p. 10

6 Evaluation Methodology p. 11

6.1 System Simulation Assumptions p. 11

6.2 System Performance Evaluation Metrics p. 16

6.2.1 Metrics without modeling RLC or Iub flow control p. 16

6.2.2 Additional metrics with RLC or Iub flow control modeled p. 16

7 Evaluation Results p. 16

8 Impact on Implementation p. 17

8.1 Impact on Infrastructure Implementation p. 17

8.2 Impact on UE Implementation p. 17

8.2.1 Impact on UE implementation due to asynchronous cell timings p. 17

8.2.2 Impact on UE Implementation due to SF-DC switching p. 18

8.2.3 Impact on UE Implementation due to SF-DC and DF-DC aggregation p. 19

8.2.4 Impact to synchronization function of the secondary serving HS-DSCH cell p. 21

8.2.5 Summary of Impact on UE Implementation p. 21

9 Higher layer impact p. 22

9.1 Overview p. 22

9.2 Intra-site Multiflow data split p. 23

9.3 Inter-site Multiflow data split p. 23

9.3.1 RLC split p. 23

9.3.2 PDCP split p. 25

10 Impact on performance of legacy UEs p. 26

11 Impact on specifications p. 27

11.1 Impact on RAN1 specifications p. 27

11.2 Impact on RAN2 specifications p. 27

11.3 Impact on RAN3 specifications p. 28

11.4 Impact on RAN4 specifications p. 28

12 Conclusion p. 28

$ Change history p. 29