Content for TR 25.800 Word version: 12.1.0

1 Scope Word‑p. 7

The present document captures evaluation results and analysis from the study item on "UMTS Heterogeneous Networks" described in [2].

2 References

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.

References are either specific (identified by date of publication, edition number, version number, etc.) or non specific.
For a specific reference, subsequent revisions do not apply.
For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.

[1]

TR 21.905: "Vocabulary for 3GPP Specifications".

[2]

RP-121436: Work item description for "Study on UMTS Heterogeneous Networks".

[3]

TR 36.819: "Coordinated multi-point operation for LTE physical layer aspects".)

[4]

R2-131106: "Mobility simulations and discussions in Heterogeneous Networks", Ericsson, ST-Ericsson, RAN2#81b

[5]

R2-131449: "Mobility performance in Hetnet - Simulation Results", Qualcomm Incorporated, RAN2#81b

[6]

R2-131458: "Simulation results for HetNet mobility", Huawei, HiSilicon, RAN2#81b

[7]

R2-130926: "Thoughts on UMTS HetNet Mobility Enhancement", ZTE, RAN2#81b

[8]

R2-131104: "Mobility Aspects in Heterogeneous Networks", Ericsson, ST-Ericsson, RAN2#81b

[9]

R2-131129: "HetNet mobility considerations", Renesas Mobile Europe Ltd, RAN2#81b

[10]

R2-131214: "LPN Cell Discovery in Inter-Frequency HetNet Scenarios", Nokia Siemens Networks, RAN2#81b

[11]

R2-131299: "Discussion on Inter-frequency small cell discovery", Huawei, HiSilicon, RAN2#81b

[12]

R2-131301: "Mobility performance issue based on UE speed", Huawei, HiSilicon, RAN2#81b

[13]

R2-131303: "Mobility issues for massive small cell deployment ", Huawei, HiSilicon, RAN2#81b

[14]

R2-131215: Dynamic Neighbour Cell List Allocation in Cell_DCH ", Nokia Siemens Networks, RAN2#81b

[15]

R2-131981: "Non DCH states optimization for HetNet", Nokia Siemens Networks, RAN2#82

[16]

R2-131876: "Further discussions on mobility performance issue based on UE speed", Huawei, HiSilicon, RAN2#82

[17]

R2-131930: "HetNet speed based mobility", Renesas Mobile Europe Ltd, RAN2#82

[18]

R2-131978: "Dynamic Neighbour Cell List Allocation in Cell_DCH", Nokia Siemens Networks, RAN2#82

[19]

R2-131927: "Neighbour list extension to support HetNet", Renesas Mobile Europe Ltd, RAN2#82

[20]

R2-131957: "Further discussions on mobility issues for massive small cell deployment", Huawei, HiSilicon, RAN2#82

[21]

R2-131910: "Mobility Aspects for Co-Channel deployment in Heterogeneous Networks", Ericsson, ST-Ericsson, RAN2#82

[22]

R2-132082: "Mobility enhancements for multi-carrier Hetnet and multiflow", Qualcomm Inc. , RAN2#82

[23]

R2-131859: "Mobility for Multiflow deployments in HetNet", Huawei, HiSilicon, RAN2#82

[24]

R2-131911: "Mobility Aspects for Combined Cell deployment in Heterogeneous Networks" Ericsson, ST-Ericsson, RAN2#82

[25]

TR 36.839: "Evolved Universal Terrestrial Radio Access (E-UTRA); Mobility enhancements in heterogeneous networks"

[26]

R2-131972: "LPN Cell Discovery in Inter-Frequency HetNet Scenarios", Nokia Siemens Networks, RAN2#82

[27]

TS 25.321: "Medium Access Control (MAC) protocol specification"

[28]

TS 36.101: "Evolved Universal Terrestrial Radio Access (E-UTRA); User Equipment (UE) radio transmission and reception".

[29]

TR 25.814: "Physical layer aspect for evolved Universal Terrestrial Radio Access (UTRA)".

[30]

R2-132620: "Mobility and Node Selection in Combined Cell Deployment for Heterogeneous Networks", Ericsson, ST-Ericsson, RAN1#73

[31]

R2-132625: "Mobility Performance Evaluation in Combined Cell Deployment in Heterogeneous Networks", Ericsson, ST-Ericsson, RAN1#73

[32]

R2-132707: "Measurements for small cells in UMTS", Ericsson, ST-Ericsson, RAN1#73

[33]

R2-132374: "Mobility for range expansion with Multiflow deployments", Huawei, HiSilicon, RAN1#73

[34]

R2-132664: "Mobility enhancements for multi-carrier Hetnet and multiflow", Qualcomm Inc. , RAN1#73

[35]

R2-132641: "Neighbour Cell List Enhancements for HetNet", NSN, RAN1#73

[36]

R1-133848: "System simulation results of HetNet in co-channel scenarios", Huawei, HiSilicon, RAN1#74

[37]

R1-130929: "Bias optimisation in heterogeneous networks", Alcatel-Lucent, Alcatel-Lucent Shanghai Bell, RAN1#72

[38]

R1-130612: "Downlink Interference Analysis for Heterogeneous Networks", Ericsson, ST-Ericsson, RAN1#72

[39]

R1-133605: "DL Control Channel Evaluation", Huawei, HiSilicon, RAN1#74

[40]

R1-133636: "Analysis of Downlink Control Channel Performance in Heterogeneous Networks", Ericsson, ST-Ericsson, RAN1#74

[41]

R1-133792: "Link Analysis of F-DPCH performance in Hetnets for different CIOs", Qualcomm Inc. , RAN1#74

[42]

R1-133673: "Link Analysis of E-HICH performance in Hetnets for different CIOs", Qualcomm Inc. , RAN1#74

[43]

R1-133793: "Link Analysis of HS-SCCH performance in Hetnets for different CIOs", Qualcomm Inc. , RAN1#74

[44]

R1-133647: "Impact of Shadow Fading in Combined Cell Deployment", Ericsson, ST-Ericsson, RAN1#74

[45]

R1-133646: "Link Level Simulation Results for Combined Cell Deployment", Ericsson, ST-Ericsson, RAN1#74

[46]

R1-132431: "Performance of Rel-12 UEs in Spatial Reuse Mode", Qualcomm Inc. , RAN1#73

[47]

R1-133644: "Link Level Analysis of Legacy UE Performance in Combined Cell Deployment", Ericsson, ST-Ericsson, RAN1#74

[48]

R1-132430: "Impact of Combined Cell Operation on Legacy Users in SFN mode", Ericsson, ST-Ericsson, RAN1#73

[49]

R1-133837: "Performance of Network Assisted IC in a Hetnet Framework", Qualcomm Inc., RAN1#74

[50]

R1-135146: "System level simulation for NAIC in HetNet", Alcatel-Lucent, Alcatel-Lucent Shanghai Bell, RAN1#75

[51]

R1-133605: "DL Control Channel Evaluation", Huawei, HiSilicon, RAN1#74

[52]

R1-135681: "DL system performance with E-DCH decoupling", Huawei, HiSilicon, RAN1#75

[53]

R1-135682: "UL system performance with E-DCH decoupling", Huawei, HiSilicon, RAN1#75

[54]

R1-135688: "On the reliability of F-DPCH from the non-serving LPN", Huawei, HiSilicon, RAN1#75

[55]

R1-135712: "System Level Simulation and SI Reliability Results for E-DCH decoupling", NSN, RAN1#75

[56]

R1-135711: "HSUPA DL control channels reliability in E-DCH decoupling", NSN, RAN1#75

[57]

R1-134773: "Performance of Control Channels for E-DCH De-Coupling", Qualcomm Inc., RAN1#74

[58]

R1-134747: "Detailed analysis of E-DCH decoupling", NSN, RAN1#74b

[59]

R1-131359: "Simulation Results on Transmission of Uplink Scheduling Information in UMTS Heterogeneous Networks", Renesas Mobile Europe Ltd, RAN1#72b

3 Definitions and abbreviations Word‑p. 9

3.1 Definitions

For the purposes of the present document, the terms and definitions given in TR 21.905 and the following apply.

A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905.

3.3 Abbreviations

For the purposes of the present document, the abbreviations given in TR 21.905 and the following apply.

An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905.

Active Set

CIO

Cell Individual Offset

CQI

Channel Quality Indicator

CRC

Cyclic Redundancy Check

DF-DC

Dual Frequency Dual Cell

Downlink

DPCCH

Dedicated Physical Control Channel

E-DCH

Enhanced Dedicated Channel

E-DPCCH

E-DCH Dedicated Physical Control Channel

E-DPDCH

E-DCH Dedicated Physical Data Channel

E-HICH

E-DCH HARQ Acknowledgement Indicator Channel

E-RGCH

E-DCH Relative Grant Channel

F-DPCH

Fractional Dedicated Physical Channel

HetNet

Heterogeneous Networks

HS-DPCCH

Dedicated Physical Control Channel (uplink) for HS-DSCH

HS-SCCH

High Speed Physical Downlink Shared Control Channel

LPN

Low Power Node

NAIC

Network Assisted Interference Cancellation

NCL

Neighbour Cell List

RoT

Rise over Thermal

RSCP

Received Signal Code Power

SF-DC

Single Frequency Dual Cell

SFN

Single Frequency Network

SHO

Soft HandOver

Scheduling Information

SIR

Signal-to-Interference Ratio

SINR

Signal to Interference plus Noise Ratio

Spatial Reuse

TPC

Transmit Power Control

User Equipment

Uplink

4 Design objective of UMTS heterogeneous networks Word‑p. 11

The detailed objectives of this study are:

Define deployment scenarios and simulation assumptions for heterogeneous networks
Investigate uplink and downlink interference issues and solutions for co-channel deployment of Macro and small cells
- identify small cell coverage issues and potential solutions
- identify the uplink interference issues between Macro cell and small cell and potential mitigation techniques
- identify the downlink interference issues between Macro cell and small cell and potential mitigation techniques
- investigate uplink and downlink imbalance issues and solutions for co-channel deployment of Macro and small cells
Investigate range expansion techniques with multi-flow
- evaluate system performance benefits of range expansion in different multi-flow configurations (including multi-carrier multi-flow configurations) over solutions possible with Rel-11 and earlier techniques
- investigate uplink and downlink imbalance effects to uplink and downlink performance due to range expansion and identify potential mitigation techniques
Investigate mobility issues, performance impacts and possible optimizations for both co-channel and dedicated frequency deployments of Macro and small cells
- investigate improvements to UE discovery and identification of small cells
- investigate UE speed based mobility solutions
- investigate the mobility issues of mass small cell deployment(e.g. UE measurement requirements, limited NCL size, PSC confusion) and possible solutions
- identify the requirements and potential solutions of mobility enhancement for multi-flow deployments, including multi-carrier multi-flow
Investigate issues and solutions in shared cells scenarios, where shared cell refers to one cell over several transmission points, e.g. spatially separated antennas
Consider to minimize the impact on physical layer and legacy terminals.