AWD-Femtocell

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(AWD-Femto)Interference Avoidance and Interference Mitigation

IEEE 802.16 Presentation Submission Template (Rev. 9)

Document Number:

IEEE C802.16m-09/1324

Date Submitted:

2009-07-06

Source:

Whai-En Chen, Shih-Yuan Cheng [email protected] Ilan University

Shiann-Tsong Sheu, Chih-Cheng Yang [email protected]

National Central University

Kanchei (Ken) Loa, Chun-Yen Hsu, Yung-Ting Lee,

Tsung-Yu Tsai, Chiu-Wen Chen [email protected]

Institute for Information Industry

Yang-Han Lee, Yih Guang Jan

Tamkang University

*Re:

802.16m Amendment Working Document

Call for contributions on Support for Femtocell BS

Base Contribution:

IEEE 802.16m-09/0010r2

Purpose:

To be discussed and adopted by TGm for the 802.16m Amendment.

Notice:

This document does not represent the agreed views of the IEEE 802.16 Working Group or any of its subgroups . It represents only the views of the participants listed inthe Source(s) field above. It is offered as a basis for discussion. It is not binding on the contributor(s), who reserve(s) the right to add, amend or withdraw material

contained herein.

Release:The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an

IEEE Standards publication; to copyright in the IEEEs name any IEEE Standards publication even though it may include portion s of this contribution; and at the IEEEs

sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this

contribution may be made public by IEEE 802.16.

Patent Policy:The contributor is familiar with the IEEE-SA Patent Policy and Procedures:

and .Further information is located at and .

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Features of Femtocell

Operates in the licensed spectrum Uses fixed broadband connection for backhaul

It is managed by the NAP

The backhaul service provider may be different from

NAP/NSP Principally intended forhome and SOHO

Lower cost than PicoBS

Smaller coverage (low power) than PicoBS

Smaller number of subscriber(ten or less) thanPicoBS

Higher density

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Deployment

Irregular deployment will incur inevitableinterference

FC

FC

FC FC

FC

FC

FC

MC 1

FC

FC

FC FC

FC

FC

FC

FC

FC

FC

FC

MC 2

FC

FC

FC

FC

FC

FC

MC : Macro Cell

FC : Femto Cell 3


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Interference Cases

Case I1. FC is covered by one MC

2. FC is covered by two or more MCs

Case II

1. FC is covered by another neighboring FC

2. FC is covered by two or more neighboring FCs

Interferencecases

One MC Two ormore MCs

One FC Two ormode MCs

FC I-1 I-2 II-1 II-2

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Interference Conditions

DL interference MS is affected by Macro/Femto BSs if it locates in the

area covered by Macro/Femto BSs

UL interference Femtocell may be affected by the neighboring MS(s)

which associates with different Macro/Femto BS(s)

In order to find out the DL interference situation,MS needs to report the scan result to which it is

associated. In order to find out the UL interference situation,

BSs should exchange the scan reports.

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Network Topology

Possible

Association

target

MS1 BS

MS2 FC1

MS3 BS/FC2

MS4 BS/FC3

MS5 BS/FC3/FC5MS6 FC1/FC4

MS7 FC5/FC6

MS8 FC7

BS

FC3

MS4

MS2

FC7

MS8

FC2

MS3

FC1

FC5 FC6

MS7

FC4

MS6

MS5

MS1

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DL Interference Cases

BS

FC3

MS4

MS2

FC7

MS8

FC2

MS3

FC1

FC5 FC6

MS7

FC4

MS6

MS5

MS1

Possible

interference

DL

MS1 X

MS2 X

MS3 (FC2/BS)

MS4 (BS/FC3)

MS5 (BS/FC3/FC5)

MS6 (FC1/FC4)

MS7 (FC5/FC6)

MS8 X

():depends on the association target

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Interference Minimization

BS

FC3

MS4

MS2

FC7

MS8

FC2

MS3

FC1

FC5 FC6

MS7

FC4

MS6

MS5

MS1

Recommended

Association target

MS1 BS

MS2 FC1

MS3 BS

MS4 BS

MS5 (BS/FC3/FC5)

MS6 FC1

MS7 FC5

MS8 FC7

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Interference resolution (w/o

system coordination)

Recommended

Association target

MS1 BS

MS2 FC1

MS3 BS

MS4 BS

MS5 BS/FC3/FC5

MS6 FC1

MS7 FC5

MS8 FC7

interference DL

MS1 X

MS2 X

MS3 X

MS4 X

MS5 (BS/FC3/FC5)

MS6 X

MS7 X

MS8 X

Most of cases could be solved except MS5. 9


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Interference Mitigation

As an MS locates in the coverage areas of two or morefemtocells, the UL/DL interference will incurs.

We propose some approaches to solve interferences

occur on MS2 for the same channel

FDM approach, which allocates different frequency bands to FCaand FCb

TDM approach, which coordinates the FCa and FCb to serve

MS2

Control the DL power level of FCa or FCb to reduce the DL

interference

FCa FCbMS2MS1 MS3

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Proposed Text

[Add the following section15.x.y Interference Avoidance andInterference Mitigation]

15.x.y Interference Avoidance and Interference Mitigation

Alternatively, the interference between Femtocells and/or

macro cells can be mitigated by static or semi-staticradio resource reservation and resource sharing usingFDM and/or TDM and/or DL fractional channel powercontrol of BSs manner.

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