Transcript IEEE C802.16m-08/540r1

Zone Loading for IEEE802.16m
Document Number:
IEEE C802.16m-08/540r1
IEEE C802.16m-08/540r1
Date Submitted:
2008-07-06
Source:
Mohammed Nafie, Cairo University
Ahmed Shalash, Cairo University
Cairo University, Cairo, Egypt
Re:
IEEE 802.16m-08/024: Call for Contributions on Project 802.16m System Description Document (SDD)
Link Adaptation
Abstract :
This contribution proposes a scheme for zone loading
Purpose:
For discussion and approval by TGm
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Introduction
IEEE C802.16m-08/540r1
• The channel quality can differ in each of the
“zones” of the allocation
– A zone can be a tile in uplink
– A zone can be several contiguous subcarriers in
downlink
• We can enhance the performance of the link if
the constellations sizes and/or the coding
assigned to each “zone” is allowed to differ
Example
IEEE C802.16m-08/540r1
• As a simple example, assume that there are six
6x6 zones assigned in a link
• By feedbacking the CQI (channel quality
indicator) based on these zones, the BS can
assign different constellation sizes
Example
IEEE C802.16m-08/540r1
• Let us assume that the BS will assign QPSK
rate 3/4 to all the 6 zones vs. assigning QPSK
rate ½ to the worst 3 an 16QAM rate ½ to the
best 3
Simulations
IEEE C802.16m-08/540r1
Proposal
IEEE C802.16m-08/540r1
• We propose that the BS acquires knowledge of
the link quality in “zones”
• The BS assigns constellations and/or coding
based on this quality
Text
IEEE C802.16m-08/540r1
• Proposed Text:
“The quality of the link will be based on zones”
“The MCS will be assigned based on zones”