Transcript IEEE C802.16m-07/308r2

Frame Structure for IEEE 802.16m
Document Number:
IEEE C802.16m-07/308r2
Date Submitted:
2007-11-08
Source:
Jin Sam Kwak, Young-Hyeon Kwon, Ronny (Yong-Ho) Kim, Kiseon Ryu
LG Electronics
E-mail:{samji, wishwill, ronnykim, ksryu}@lge.com
Re:
TGm Call for comments on SDD, IEEE 802.16m-07/040
Abstract:
Discussion on the 16m frame structure in views of legacy support
Purpose:
To discuss the frame structure in the 802.16m SDD
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Legacy Support in 802.16m SRD
• 802.16m Requirements on Legacy Support
– A Legacy System: WirelessMAN-OFDMA Reference System
• WiMAX Forum Mobile System Profile, Rel. 1.0 (Rev. 1.4.0)
– Five requirements on backward compatibility have been defined, which
are basically including concurrent operation and coexistence with
legacy system.
– The ability of the disabled legacy-support mode should be reflected into
the 802.16m frame structure
“IEEE 802.16m shall provide the ability to disable legacy support.”
It is essential that the 16m TDD frame structure should be flexible enough to
support smooth migration between disabled and enabled legacy-support modes
while meeting 802.16m and IMT-Advanced requirements.
16m Frame Structure
•
Multiple Access Scheme
–
•
In accordance with the requirement of the legacy support for the
Wireless MAN-OFDMA reference system, a OFDMA-based multiple
assess scheme should be basically considered for 16m air interface.
Duplexing Modes: TDD/FD-FDD/HD-FDD
–
–
Basically, the commonality between TDD and FDD modes should be
considered in the frame structure.
•
The legacy support is currently confined to TDD mode only in 16m SRD.
•
Even though the (half-duplex) FDD operation is now considering in the
WiMAX Rel. 1.x., the 16m frame structure for the FDD mode should
optimize and support the inherent FDD enhanced features.
FDD frame structure shall support
•
Both full- and half-duplex MS operation.
•
Both unpaired and paired frequency allocations.
16m Frame Structure
•
Spectrum capabilities/scalability
–
As described in the 16m SRD, 802.16m should support the
scalable bandwidths from 5 MHz to 20 MHz.
•
–
The 16m air interface should be readily extensible to larger
channels by reflecting the outcome of WRC’07 for the available
bandwidths.
The 16m frame structure should be capable of the
operation of a mix of legacy and 802.16m systems with
the same or different channel bandwidth.
“Systems based on IEEE 802.16m and the Wireless-OFDMA Reference System shall be
able to operate on the same RF carrier, with the same channel bandwidth; and should
be able to operate on the same RF carrier with different channel bandwidths.”
16m Frame Structure
A Concept of Legacy Support for 16m TDD Frame Structure
Time
Time
16m Zone #A
16m Zone #C
16m Zone #E
16m Zone #B
16m Zone #D
MAPnew
16m BW
Legacy Zone #C
Legacy Zone #2
MAP†
Preamble†
Legacy BW
16m Zone #B
16m Zone #C




<Legacy Support>
Smooth
Migration


16m BW


FCHnew
FCH†
–
16m Zone #A
Freq.
Freq.
Preamblenew
•
<Disabled Legacy Support>
Zone-based legacy support is a general approach, furthermore, the
enhancements for system and control information of 802.16m without
legacy support should be allowed in the 802.16m.
• Preamble†/FCH†/MAP† : Enhanced Preamble/FCH/MAP for supporting 802.16m with legacy support
• Preamblenew/ FCHnew/ MAPnew : New Preamble/FCH/MAP for supporting 802.16m without legacy support
• 16m Zone #k : New permutation zone for 802.16m without legacy support
Frame Structure in 16m SDD
•
It is highly recommended to address the following
items:
– DL/UL Multiple Access Scheme
– Duplexing mode: TDD/HD-FDD/FD-FDD
– Spectrum capability/scalability
– Interoperability with legacy system
•
Legacy support mode
•
Disabled legacy support mode