tdd frame structures for legacy support in 16m ieee 802.16 presentation submission template (rev....
DESCRIPTION
Same bandwidth for 16m system and legacy system (1/2) – Option 1 16e preamble is re-used Frame control information (e.g., FCH, DL/UL-MAP etc) can be extended to support the new zones for 16m transmission New zones are defined for the 16m DL/UL traffic –Advanced transmission techniques can be exploited in the new 16m zones to improve the system performanceTRANSCRIPT
TDD Frame Structures for Legacy Support in 16m
IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number:
IEEE S802.16m-07/242r1, TDD Frame Structures for Legacy Support in 16mDate Submitted:
2007-11-7Source:
Dong Li, Liyu Cai, Hongwei Yang, Jimin Liu Voice: +86 21 58541240 Ext 9292 E-mail: {dong.li, liyu.cai, hongwei.yang, jimin.liu}@alcatel-
sbell.com.cn Joerg Schaepperle Voice: +49 711 821 32266
E-mail: [email protected] Balachandran Voice: +1 908 582 2691
E-mail: [email protected]
*<http://standards.ieee.org/faqs/affiliationFAQ.html>Venue:
Call for 802.16m contributions on SDDBase Contribution:
C80216m-07+242r1Purpose:
For 802.16m discussion and eventual adoption for standardization 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.
Release:The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE 802.16.
Patent Policy:The contributor is familiar with the IEEE-SA Patent Policy and Procedures:
<http://standards.ieee.org/guides/bylaws/sect6-7.html#6> and <http://standards.ieee.org/guides/opman/sect6.html#6.3>.Further information is located at <http://standards.ieee.org/board/pat/pat-material.html> and <http://standards.ieee.org/board/pat >.
Outline
• Frame structures with legacy support shall be designed for both cases of equal bandwidths and different bandwidths between legacy system and 16m system– In case of equal bandwidths between 16m and legacy systems, two
solutions may be considered• Solution 1 with reuse of 16e preamble• Solution 2 with staggered frame structure using new 16m preamble
– In case of different bandwidths for 16m and legacy systems• Sub-case 1: 16m system with the same frame duration as legacy system
– Solution 1 in support of one legacy system with preamble sequence extended on the legacy preamble
– Solution 2 in support of multiple parallel legacy systems with staggered frame structure using new 16m preamble
• Sub-case 2: 16m frame with shorter frame duration than a legacy system– Solution with introduction of mini-frames to reduce the latency
Same bandwidth for 16m system and legacy system (1/2) – Option 1
• 16e preamble is re-used• Frame control information (e.g., FCH, DL/UL-MAP etc) can be
extended to support the new zones for 16m transmission• New zones are defined for the 16m DL/UL traffic
– Advanced transmission techniques can be exploited in the new 16m zones to improve the system performance
DL subframe UL subframe
TTG
Legacy UL dataLegacy DL dataNew zones for 16m DL data
New zones for 16m UL data
RTG
16e
prea
mbl
e
DL-
MA
P
16e
prea
mbl
e
One Frame: 5 ms
DC in view of 16m and legacy MSs
Lega
cy fr
ame
cont
rol
Same bandwidth for 16m system and legacy system (2/2) – Option 2
• Staggered frame structure where the start of the 16m frame is staggered in time with respect to the legacy frame
• New 16m preamble sequence and frame control information which provides greater flexibility for 16m system design
• no mutual interference will result between 16m allocations and 16e allocations
Legacy DL subframe Legacy UL subframeTTG
Legacy UL dataLegacy DL data 16m DL data 16m UL data
RTG
One Frame in legacy MS’s view
DC in view of 16m and legacy MSs
16e
prea
mbl
e
16m DL subframe 16m UL subframeRTG
One Frame in 16m MS’s view
TTG
16e
prea
mbl
e
Lega
cy fr
ame
cont
rol
16m
pre
ambl
e
16m
fram
e co
ntro
l
Legacy DL data
Lega
cy fr
ame
cont
rol
Wider bandwidth for 16m system (1/4) - Unchanged frame duration
• Support of one legacy system– Legacy frame are embedded within the 16m frame through FDM or
combined FDM&TDM– The legacy frame can be located on the edge of the spectrum or in the
middle of it to simplify the 16m system definition– Specification shall be defined for both the partial-spectrum zones (e.g.,
10MHz out of 20MHz) and full-spectrum zones in 16m specification (e.g., permutation mapping of subcarriers to logical subchannels)
– It is preferred that the 16m preamble and legacy preamble co-exist in the same OFDM symbol in order to ensure the frames of 16m BS and legacy BS are synchronous in views of both legacy MSs and 16m MSs. The joint design of the 16m preamble and legacy preamble should guarantee low PAPR and good auto/cross-correlation properties.
– Some guard tones may be reserved between legacy system spectrum and the remaining spectrum to facilitate the filtering at MS
Wider bandwidth for 16m system (2/4) - Unchanged frame duration
Option 1: Legacy frame located on the
edge of spectrum
Option 2: Legacy frame located in the
middle of spectrum
Prea
mbl
e ex
tens
ion
DL subframe UL subframeTTG
Legacy UL dataLegacy DL data
16m
fram
e co
ntro
l
16m DL data
16m DL data
16m UL data
16m UL data
RTG
16e
prea
mbl
e
One Frame: 5 ms
20M
Hz
10M
Hz
Lega
cy fr
ame
cont
rol
Prea
mbl
e ex
tens
ion
16m
fram
e co
ntro
l
16e
prea
mbl
e
Lega
cy fr
ame
cont
rol
Guard tones Guard tones Guard tonesPr
eam
ble
exte
nsio
n
DL subframe UL subframe
Legacy UL dataLegacy DL data
16m DL data
16m DL data
16m UL data
16m UL data
16e
prea
mbl
e
One Frame: 5 ms
20M
Hz
10M
Hz
Prea
mbl
e ex
tens
ion
16m DL data 16m UL data
Lega
cy fr
ame
cont
rol
16m
fram
e co
ntro
l16
m fr
ame
cont
rol
TTG RTG
Guard tones
Guard tones
Guard tones
Guard tones
Prea
mbl
e ex
tens
ion
16e
prea
mbl
ePr
eam
ble
exte
nsio
nLe
gacy
fram
e co
ntro
l16
m fr
ame
cont
rol
16m
fram
e co
ntro
l
Guard tones
Guard tones
• Support for one legacy system
Wider bandwidth for 16m system (3/4) - Unchanged frame duration
• Support for multiple parallel legacy systems– Staggered frame for 16m with the start of the frame preceded by
allocations for multiple parallel and synchronous legacy systems – New 16m preamble sequence and frame control information which
provide larger flexibility for 16m system design– Specification shall be defined for only the full-spectrum zones,
which reduces the system complexity
Guard tones
Legacy DL subframe Legacy UL subframeTTG
Legacy UL dataLegacy DL data
16m DL data 16m UL data
RTG
16e
prea
mbl
e
One Frame in legacy MS’s view
20M
Hz
10M
Hz
Legacy DL data
16e
prea
mbl
e
10M
Hz
16m
Pre
ambl
e
16m
fram
e co
ntro
l
16m DL subframe 16m UL subframeOne Frame in 16m MS’s view
TTG RTG
Lega
cy fr
ame
cont
rol
Lega
cy fr
ame
cont
rol
Legacy UL data
Legacy DL data
16e
prea
mbl
e
Legacy DL data
16e
prea
mbl
e
Lega
cy fr
ame
cont
rol
Lega
cy fr
ame
cont
rol
Guard tones Guard tones
Wider bandwidth for 16m system (4/4)- Reduced frame duration
• Reduced frame duration – The reduced mini-frame
duration is beneficial for reducing the latency
– The last DL-to-UL transition position of 16m frame can be switched between the transition point of legacy system and the transition point of the last mini-frame through resource scheduling
– Other features are the same as those shown in page 5
BS Tx16m/16e MS Rx
BS Rx16m MS Tx
BS Tx16m MS Rx
BS Rx16e/16m MS Tx
Prea
mbl
e ex
tens
ion
Prea
mbl
e ex
tens
ion
One frame (5ms)
1st min-frame 2nd mini-frame
DL of 1st mini-frame DL of 2nd mini-frameUL of 1st mini-frame UL of 2nd mini-frame
DL subframe for 16e UL subframe for 16e
preamble
TTG RTG TTG
Lega
cy fr
ame
cont
rol
16e
prea
mbl
e Legacy DL dataLegacy UL data
16m DL data in 1st mini-frame
16m DL data in 1st mini-frame
16m UL data in 1st mini-frame
16m DL data in 2nd mini-frame
16m UL data in 2nd mini-frame
16m UL data in 2nd mini-frame
20M
Hz
10M
Hz
Min
i-fra
me
cont
rol
Prea
mbl
e ex
tens
ion
Min
i-fra
me
cont
rol
Min
i-fra
me
cont
rol
Prea
mbl
e ex
tens
ion
Prea
mbl
e ex
tens
ion
16e
prea
mbl
ePr
eam
ble
exte
nsio
n
Guard tones
Guard tones
Guard tones
Guard tones
Recommendation
• It is suggested to discuss and include the proposed TDD frame structures with legacy support into the 16m SDD