IEEE C802.16m-10/0249r1
Project
IEEE 802.16 Broadband Wireless Access Working Group <http://ieee802.org/16>
Title
Clarification to MLRU Formation (Section 16.3.5.3)
Date
Submitted
2010-03-05
Source(s)
Taeyoung Kim, Hyunkyu Yu
hk.yu@samsung.com
Samsung Electronics Co., Ltd.
Re:
IEEE 802.16-10/0011, “IEEE 802.16 Working Group Letter Ballot#31”
Target topic: “IEEE P802.16m/D4 section 16.3.5.3”.
Abstract
This contribution provides clarification on the formation of MLRU.
Purpose
To be discussed and adopted by TGm
Notice
Release
Patent
Policy
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IEEE C802.16m-10/0249r1
Clarification to MLRU Formation (Section 16.3.5.3)
Taeyoung Kim, Hyunkyu Yu
Samsung Electronics
1. Introduction
This contribution provides the clarification on the MLRU formation.
- Renumbering of subcarrier pairs
- In D4, formation rule is only defined for MLRU which is the unit of assignment A-MAP IE. The rule
should be applied for all A-MAPs such as NUS-A-MAP, HF-A-MAP, PC-A-MAP, and A-A-MAP.
Proposed text with markups
Blue/Underline: Text Added
Red/Strikeout: Text Deleted
2. References
[1] IEEE P802.16m/D4, “P802.16m DRAFT Amendment to IEEE Standard for Local and metropolitan area
networks Part 16: Air Interface for Broadband Wireless Access Systems”
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IEEE C802.16m-10/0249r1
3. Proposed Text Changes
[Remedy#1: Modify the text, line 63 in page 4, section 3]
--------------------------------------------------Start Proposed Text------------------------------------------------------------3.110 logical resource unit (LRU): the generic name of logical units for distributed and localized resource
allocations. LRU is of same size as PRU.
---------------------------------------------------End Proposed Text-------------------------------------------------------------
[Remedy#2: Modify the text, line 28 in page 372, section 16.3.5.1]
--------------------------------------------------Start Proposed Text------------------------------------------------------------16.3.5.1 Physical and logical resource unit
A physical resource unit (PRU) is the basic physical unit for resource allocation that comprises Psc consecutive
subcarriers by Nsym consecutive OFDMA symbols. Psc is 18 subcarriers and Nsym is 6, 7, and 5 OFDMA
symbols for type-1, type-2, and type-3 AAI subframes, respectively. A logical resource unit (LRU) is the basic
logical unit for distributed and localized resource allocations. An LRU is Psc·Nsym subcarriers for type-1 AAI
subframes, type-2 AAI subframes, and type-3 AAI subframes. The effective number of subcarriers in an LRU
depends on the number of allocated pilots.
16.3.5.1.1 Distributed logical resource unit
The downlink distributed logical resource unit (DLRU) contains a group of subcarriers that are spread across
the distributed resource allocations within a frequency partition. The size of the DLRU equals the size of PRU,
i.e., Psc subcarriers by Nsym OFDMA symbols. The minimum unit for forming the DLRU is equal to a pair of
subcarriers, called tone-pair, as defined in 16.3.5.3.2. The downlink DLRUs are obtained by subcarrier
permuting on the data subcarriers of the distributed resource units (DRUs). The size of the DRU equals the size
of PRU, i.e., Psc subcarriers by Nsym OFDMA symbols.
16.3.5.1.2 Contiguous logical resource unit
The localized logical resource unit, also known as contiguous logical resource unit (CLRU) contains a group of
subcarriers that are contiguous across the localized resource allocations. CLRU consists of the data subcarriers
only in the contiguous resource unit (CRU) of which size equals the size of the PRU, i.e., Psc subcarriers by
Nsym OFDMA symbols. The size of the CLRU equals the size of the PRU, i.e., Psc subcarriers by Nsym OFDMA
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IEEE C802.16m-10/0249r1
symbols. The CLRUs are obtained from direct mapping of contiguous resource units (CRUs). Two types of
CLRUs, subband LRU (SLRU) and miniband LRU (NLRU), are supported according to the two types of CRUs,
subband and miniband based CRUs, respectively.
---------------------------------------------------End Proposed Text-------------------------------------------------------------
[Remedy#3: Modify the text, line 48 in page 390, section 16.3.5.3.4]
--------------------------------------------------Start Proposed Text------------------------------------------------------------16.3.5.3.4 Formation of MLRU A-MAP Symbols to Subcarrier Pair Mapping
To form MLRUs for the assignment A-MAP The mapping of A-MAP symbols to tone-pairs in LRU is given as
follows:
1) Renumber all tone pairs in the distributed LRUs in the A-MAP region in a time first manner. Assuming that
each LRU has LSP tone-pairs per OFDMA symbol, the renumbered A-MAP tone-pairs in the A-MAP region are
denoted by RMP[u], where u ranges from 0 to LAMAP·Nsym·LSP - 1, and LAMAP is the number of LRU allocated to
the A-MAP.
FPi
2) A distributed tone-pair, SPLRU
 m  , is mapped to RMP[u], where u = s·Nsym·LSP + m·Nsym + l. u = s·Nsym·LSP
s ,l
FPi
+ m·Nsym + l. SPLRU
 m  is the tone-pair index of the mth tone-pair in the lth OFDMA symbol in the sth
s ,l
distributed LRU of frequency partition i as defined in 16.3.5.3.2.
3) A-MAP symbols of an A-MAP channel are mapped to logically contiguous RMP[u]s. For example,
Ssuppose RMP[v] is the first tone-pair for Assignment A-MAP. The kth MLRU is formed by tone-pairs from
RMP[v + k · NMLRU / 2] to RMP[v + (k+1) · NMLRU / 2 - 1], where NMLRU is the size of an MLRU.
Renumbering of tone-pairs should be performed considering only the data tone-pairs, where in each symbol
data tone-pairs are shifted to fill the pilot tone location.
---------------------------------------------------End Proposed Text-------------------------------------------------------------
[Remedy#4: Modify the text, line 57 in page 577, section 16.3.8.1]
--------------------------------------------------Start Proposed Text------------------------------------------------------------16.3.8.1 Physical and logical resource unit
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IEEE C802.16m-10/0249r1
A physical resource unit (PRU) is the basic physical unit for resource allocation that comprises Psc consecutive
subcarriers by Nsym consecutive OFDMA symbols. Psc is 18 and Nsym is 6, 7, 5, and 9 OFDMA symbols for
type-1, type-2, type-3, and type-4 AAI subframes, respectively. A logical resource unit (LRU) is the basic
logical unit for distributed and localized resource allocations. An LRU has Psc·Nsym subcarriers. The LRU size
for control channel transmission should be same as for data transmission. Multiple users are allowed to share
one control LRU. The effective number of data subcarriers in an LRU depends on the number of allocated pilots
and control channel presence.
16.3.8.1.1 Distributed logical resource unit
The uplink distributed logical resource unit (DLRU) contains a group of subcarriers from 3 tiles that are spread
across the distributed resource allocations within a frequency partition. The size of the DLRU equals the size of
a PRU, i.e., Psc subcarriers by Nsym OFDMA symbols. The minimum unit for forming the uplink DLRU is a tile.
The uplink tile size is 6 x Nsym, where the value of Nsym depends on the AAI subframe type.
16.3.8.1.2 Contiguous logical resource unit
The localized logical resource unit, also known as contiguous logical resource unit (CLRU) contains a group of
subcarriers that are contiguous across the resource allocations. CLRU consists of the data subcarriers only in the
contiguous resource unit (CRU) of which size equals the size of a PRU, i.e., Psc subcarriers by Nsym OFDMA
symbols.The size of the CLRU equals the size of a PRU, i.e., Psc subcarriers by Nsym OFDMA symbols.
---------------------------------------------------End Proposed Text-------------------------------------------------------------
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