Text Proposal on SFH Transmission of Femtocell
IEEE 802.16 Presentation Submission Template (Rev. 9)
Document Number:
IEEE S802.16m-09/1405
Date Submitted:
2009-07-14
Source:
Young Jin Sang, Kwang Soon Kim
Yonsei Univeristy
Sungcheol Chang, Won-Ik Kim, Sungkyung Kim,
Hyunjae Kim, Chulsik Yoon, Jeehwan Ahn
ETRI
E-mail: yjmich@dcl.yonsei.ac.kr
E-mail: {scchang, csyoon}@etri.re.kr
*<http://standards.ieee.org/faqs/affiliationFAQ.html>
Venue:
IEEE 802.16m-09/0028r1. ”Call for Comments and Contributions on Project 802.16m Amendment Content”
Target topic "Support for Femtocell BS
Base Contribution:
IEEE C802.16m-09/1405
Purpose:
To discuss and incorporate the proposed txt into the 802.16m AWD
Notice:
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Motivation
• On SDD, 15.9 Interference Avoidence and Interference
Mitigation
– In order to reduce interference on the control signaling such as SFH and
essential control signaling of Femtocells and/or macro BSs, different resources
block arrangements may be used among Femtocells and/or macro cells for
transmitting control signaling. The MS can derive the resource block
arrangements for control signaling based on A-PREAMBLE.
• Proposals to reduce interference on SFH of Femtocells and
Macro BSs
– TDM: A time offset of SFH on femtocells to PA-PREAMBLE
• Several contributions propose it.
– Sharing a part of SFH radio resource for Macro BS to transmit SFH of
FemtoCells
• This contribution proposes it.
Sharing Radio Resource of SFH
• Femtocells use a part of SFH
resources of Macro BSs.
– Reduced resource for SFH of
femtocells
• Small DRUs with no repetition of
SFH basic coding blocks
– Power boosting for transmitting SFH
of femtocells
– Permutation with fixed IDcell
– DRUs except DRUs for SFH of
femtocells remain empty to reduce
interfernce to SFH of Macro BSs.
• AMS can decode Macro BS SFH
using DRUs except DRUs used by
Femtocell SFH
Numerical Results
• Femtocell uses a part of SFH radio resource of Macro BSs
• Detection error probabilities versus location
– Yellow color : Perr < 1%; Green color: 1%<Perr<10%
– Red color: 10% < Perr
Femto coverage-SFH, Without repetition
150
Macro coverage-SFH, Without repetition
100
100
50
50
0
0
-50
-50
-100
-100
-150
0
50
100
150
200
250
300
Detection error probabilities
for SFH of macro BSs
0
50
100
150
200
Detection error probabilities
for SFH of a femtocell
Femtocell Deployments
• Detection probabilities of Macro BS SFH
– Small corruption of Macro BS SFH at the edge of the cell coverage
(1200m) if Femtocell SFH with repetition 1 (no repetition)
• 5 repetitions for Macro BS SFH
Macrocell SFH decoding probability inside femtocell
0.1
0.09
Nrep,femto=1
0.08
Nrep,femto=2
0.07
Nrep,femto=3
PER
0.06
0.05
0.04
0.03
0.02
0.01
0
0
200
400
600
800
Distance from the macrocell ABS
1000
1200
Conclusion
• The modified SHF of femtocell is transmitted on shared radio
resources of macro BS SFH.
– No additional resource for the transmission of femtocell SFH.
• 1 additional subframe is required for SFH transmission of femtocell if time
offset approach is used.
– Possible to decode both SFHs of femtocell and macro BS.
• This meets the operation of CSG femtocell.
– But, small increase of detection error probability of Macro BS SFH at
the edge of cell coverage.
• The proposed text
– Refer to the proposed text in the contribution, C802.16-09/1405.