Transcript IEEE C802.16m-09/2769

An interference mitigation framework in femtocell
(P80216m/D3-16.4.11)
Document Number: IEEE C802.16m-09_2679
Date Submitted: 2009-12-29
Source:
Kanchei(Ken) Loa, Yi-Ting Lin, Tsung-Yu Tsai, Yung-Lan Tseng, Chun-Yen Hsu, Chiu-Wen Chen
E-mail: [email protected], [email protected]
Institute for Information Industry (III)
Venue:
Base Contribution: N/A
Re : P802.16m/D3
Purpose: Discussion and approval of the proposal into the IEEE P802.16m/D3
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Introduction
• In this contribution, we propose an interference
mitigation (IM) framework with the following
features:
– Could operate under current PHY structure of 802.16m
• Limit the additional modification and complexity of the PHY
structure of femtocell.
– Flexibility to accommodate different interference
mitigation schemes or algorithms
• The choosing and operating of interference mitigation schemes in
femtocells have limited effect to the operation of AMSs.
Proposed Interference Mitigation
Framework
• The proposed IM framework considers two main
categories of interference in femtocells
– The interference between femtocells and overlapping
macrocells
– The interference between femtocells
IM between macrocell and
femteocell
• If the DFPC of overlapping macrocell(s) is not equal to 0
– the Femto ABS is able to obtain the frequency partitions information of
the overlapping macro ABS via either the SFH transmitted by the
overlapping macro ABS or wireline backhaul.
• Femto ABS can avoid scheduling data or control messages (e.g. A-MAP) in the
occupied frequency partitions of the macro ABS (i.e. frequency partition with high
power) to evade the interference.
– For the case that macrocell’s DFPC is 1~6, there is always two
frequency partitions which have lower interference from the
overlapping macrocells.
IM between femtocells
• Regardless the actual interference mitigation scheme performed
in the backhaul, the Femto AMS receives/transmits data or
control messages according to the received A-MAP.
– The interference of data could be evaded by scheduling.
– The signaling overhead for IM in the air link is minimized.
• The location of A-MAP region of femtocell is in the first DRUs
of one of the frequency partition
– The Femto ABS transmits A-MAP in chosen frequency partition
• The location of A-MAP region may be semi-static and switched to different frequency
partitions.
– The femto AMS could blindly decode the non-user-specific A-MAP in
each frequency partition and detect the existence of A-MAP via the CRC
in the non-user-specific A-MAP.
• Since DRU is permutated in a cell-specific manner, when the non-user-specific A-MAP
is detected (via CRC) in a frequency partition, the cell which transmits the A-MAP is
also identified.
• After non-user-specific A-MAP is detected, the Femto AMS continues to decode
remaining part of the A-MAP region to obtain the scheduling information of this
subframe.
Proposed text
[Add the following text in the section 16.4.11 on page 604 (line 11) as shown below]
The Femto ABS transmits A-MAP in selected DL subframes and frequency
partitions. When the A-MAP is transmitted by a Femto ABS in a DL subframe, it
appears in the first DRUs of the selected frequency partition.