Power Control in 802.16m
Document Number:
IEEE S802.16m-08/682r2
Date Submitted:
2008-07-15
Source:
Kanchei (Ken) Loa, Chiu-Wen Chen,
Yung-Ting Lee, Youn-Tai Lee, Hua-Chiang Yin,
Yi-Hsueh Tsai, Chun-Yen Hsu
Institute for Information Industry
Whai-En Chen
National Ilan University
Shiann-Tsong Sheu, Chih-Cheng Yang
National Central University
Yang-Han Lee, Yih Guang Jan
Tamkang University
Re:
Voice: +886-2-66000100
E-mail: loa@iii.org.tw
*<http://standards.ieee.org/faqs/affiliationFAQ.html>
IEEE 802.16m-08/024: Call for Comments and Contributions on Project 802.16m
System Description Document (SDD) on the topic of “Power Control”
Base Contribution:
IEEE C802.16m-08/682r3
Purpose:
For discussion and approval by IEEE 802.16 Working Group
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 in
the “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.
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Major Considerations for Power
Control in 16m Systems (1/2)
•
•
•
•
Frame structure and the DL/UL control structure
Open loop or closed loop power control
DL channels include the common and dedicated channels
UL channels include the random access and dedicated
channels
• Power control for BS/MS in spatial diversity (e.g., MIMO)
• Power control for BS/MS in macro diversity (e.g.,
soft/softer handover)
2
Major Considerations for Power
Control in 16m Systems (2/2)
• Power control for fast moving MS
• Power control for self-organization/optimization
networks (SON; e.g., pico-cell, femto-cell and relay
networks)
• Power control with fractional frequency reuse (FFR) in
different scenarios
• Sub-carrier power boost (e.g., preamble/pilot boosting)
• Joint decision of power control and rate adaptation
• Differential or aggregate power adjustment
3
Two-stage Closed Loop Power Control
• In 802.16m SDD, we propose a two-stage closed loop
power control scheme, which consists of
– the outer loop power control and
– the inner loop power control.
• The outer loop power control sets the target SINR
based on the requested bit/block error rate.
• The inner loop power control dynamically adjusts the
transmit power to achieve the target SINR.
4
For DL Power Control
• The transmit power of the BS in E-MBS and unicast
zones may be different.
• In a sub-frame, the transmit power of the BS is fixed.
• For MSs in a sub-frame, the required bit/block error
rate should be achieved by using rate adaptation.
5
For UL Power Control
• For random access channel, open loop power control
should be used.
• For dedicated channel, closed loop power control
should be used.
– For the fast-moving MS, the power control would not be able to
compensate the fast fading channel effect.
– The BS and fast-moving MS may request to change the power
control mode.
6
Multiple BSs Involved Cases
• In spatial/macro diversity, the transmit power for UL
should be cooperatively controlled by the BSs.
7
Suggestion
• Adopt the proposed text in C80216m-08_682
or later version.