Proposed Text on Section 15.3.5.2.2 Miniband Permutation of 802.16m Amendment

Document Number: IEEE C80216m-09_0623

Date Submitted: 2009-03-02

Source: HanGyu Cho, Seunghyun Kang, Jong Young Han, Sunam Kim, Email: {hgcho, sh_kang Jin Sam Kwak fanaticey, snkim86, samji} @lge.com

LG Electronics

Venue: “802.16m AWD”: IEEE 802.16m-09/0012. ”Call for Contribution on Project 802.16m Amendment

Working Document (AWD) Content” Target topic: Call for Comments on Amendment Working Document Purpose: To provide proposed text on DL subcarrier permutation to be approved by TGm and adopted in the Amendment Working DocumentNotice:

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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Motivation

In the current IEEE 802.16m Amendment Working Document (IEEE 802.16m-09/0010), the miniband permutation formula in the section 15.3.5.2.2 (DL) and 15.3.8.2.2 (UL) is TBD

So far, there have been many miniband permutation formulas proposed by each company

This contribution reviews those rules and suggests one miniband permutation formula used for both DL and UL.

Miniband Permutation Permutes the PRUMBs to insure frequency diverse PRUs ar

e allocated to each frequency partition.

Miniband permutation

Miniband Permutations Considered

LGE’s proposed MB permutation

where

}{ mod }{}{ mod})/,({ 212

221

22 NjK

KNNKGCD

Nj

Nj

NNNi MB

MB

MB

Miniband Permutations Considered Intel (IEEE 802.16m-08/1508r1)

where PermSeq(k) is the k-th elelment of the S-Random permutation sequence of length LMB from the table

Samsung (IEEE 802.16m-08/1508r1)

where BROk(y) indicates the bit-reversed k-bit value of y

222 mod}{/ NjNNjPermSeqi

12

2

21log ( )2 2 1 1

mod BROMBN

MBN

j NN LjiN N N L N

Miniband Permutations Considered

Motorola (IEEE 802.16m-08/1508r1)

ITRI (IEEE 802.16m-08/1508r1)

MBMB LjforjLji

44

4mod

( )( ( ) mod ) , 0,1,..., 1

( )( ) ,1

( ) max( ( mod ( )) ,0),

1

MB

MB

MB

q ji q j D FPCT j KD

r jq j jD

r j j L FPCT DLDFPCT

Miniband Permutations Considered

ZTE (IEEE 802.16m-08/1508r1)

where

2 22

modji Perm N j NN

mod , if mod 0 or mod

mod modmod mod ,

1 1

MB MB

MB MBMB

k kn k m K n K nm m

Perm kk K n k K n

n k K n m elsem m

, MBMB

Kn K mn

Investigation on Miniband Permutation of Each Company

LGE Selecting one miniband per each subband in order

Samsung Selecting one miniband per each subband in order When LMB is not the integer multiple of subband size (N1), it does not work

Usually, LMB is the integer multiple of subband size (N1) But, L_MB could not be in the unit of N1, e.g., when considering guard-carriers

(which could not be in the unit of N1) Intel

We don’t need to use the permutation sequence table designed for subcarrier permutation in miniband permutation

Motorola Dividing total LMB minibands into 4 groups and selecting one miniband per

each group in order Could be worse when # of miniband per freq. partition is smaller than 4, e.

g., LMB =12 & FPCT=4 with equal BW When LMB is not the integer multiple of subband size (N1), it does not work

Conclusions

Most proposals show the similar diversity gain in terms of LLS results Please refer to Intel’s contribution (IEEE C802.16m-09/0251)

LGE’s proposed MB permutation is simple and has no restriction on LMB size

Proposed Text Adopt the the miniband permutation equation in the page

4 of this contribution for PRUMB to PPRUMB mapping in equation (178) of page 26 of IEEE 802.16m-09/0010

Also, adopt the the miniband permutation equation in the page 4 of this contribution for PRUMB to PPRUMB mapping in equation (190) of page 38 of IEEE 802.16m-09/0010