UL Throughput Improvement Trial Result - UL CoMP IRC - 20171226

LTE1402 Uplink Intra eNodeB CoMP 2017-12-26 Nokia NPO 1

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Feature Fe ature Act Activatio ivatio n Proposal Propo sal Background

• UL throughput performance performance in some provinces is below the target, where LTE1402 LTE1402 can be implemented to further improve the user experience in UL at the intra-eNB cell overlapping area by combining the signal from neighbouring cell to achieve diversity gain. • Together with the feature activation, UL Combination Mode should be changed c hanged from MRC to IRC.







Introduction What is UL CoMP? •

Receive UEs uplink signal by more than one cell •

Intra eN eNB B CoM CoMP P: cells involved in reception of the UE belong to t he same eNB (cells are colocated) •

•

LTE1402, LTE1691: LTE1691: UL inter-ce inter-cell ll intra eNB eNB reception + Interference Rejection Combining (IRC)

UL SINR enhancement allows for increase increased d UL throughp ut on average and cell edge. Gains depend on load and interference conditions in the network •

Macro deployment: 8% average*

•

Hotspot deployment: 12% average*







Techni cal Details Why use UL CoMP? In general, LTE LTE has frequency reuse of 1. That means a lot of interference on cell edges. In effect, on cell edge UEs are received with similar power by serving and neighbour neighbour cell… cell…







Techni cal Details Why use UL CoMP? Benefits of incr ea easing sing th e aperture in intra eNB eNB UL CoM CoMP P Combining gain on intra cell edge due to more antennas (up (u p to 3d 3dB) B) 90

40

120

Effect of diversity gain in fading channel.

60

30

0 150

20

30

-10 4 Rx antennas

10

3dB combining gain

-20 0 180

0

UL CoMP area

0

0. 5

1

1.5

2

2.5

3

3.5

4







Techni cal Details Intr In tra a eNB Co CoMP MP con conce cept pt With co-located cells being processed by the same System Module, Module , sharing data among cells is no longer a problem UEs in the internal cell boundaries will be received with similar levels by serving and neighbor cell

- Intra eNB UL CoMP is possible within internal cell boundaries Sector3

Sector2

Sector1

LCR3: Tx1 & Rx1

LCR2: Tx1 & Rx1

LCR1: Tx1 & Rx1

Sector3 LCR3: Tx2 & Rx2

Sector2

Sector1

LCR2: Tx1 & Rx2

LCR1: Tx2 & Rx2

No UL CoMP between different eNBs

UL CoMP









Benefit Bene fit s and Gains Stationary test trial result







Benefit Bene fit s and Gains Drive test trial result







Parameter Settings







Perfo Pe rfo rmance update upd ate after after fea f eatur ture e acti acti vation – PY_Cluster01







Perfo Pe rfo rmance update upd ate after after fea f eatur ture e acti acti vation – PY_Cluster01















UL Throughput Improvement Trial Result - UL CoMP IRC - 20171226

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