doc.: ieee 802.15-08-0240-00-003c submission slide 1 april, 2008 nict project: ieee p802.15 working...
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doc.: IEEE c Submission Slide 3 April, 2008 NICT SCAN Comments are shown in the next page SCAV-OFDM SCAN CHs4 CHs (appendix A)12 LRP CHs (appendix A) SCAN Procedure- SCAN by Omni /Quasi- Omni beams (The number of Quasi-omni beams is upto 4) SCAN by Omni SCAN informationChannelRatingList Piconet detectionBy beacon of base (common) rate – LRP1 (50Mbps) By beacon of base rate (TBD) Channel Switching Time (pPHYChannelSwitchTi me) 100us1000us Channel clear assessment (CCA) time 5us9usTRANSCRIPT
doc.: IEEE 802.15-08-0240-00-003c
Submission Slide 1
April, 2008
NICT
Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: [Questions/Comments on AV-OFDM MAC]Date Submitted: [April 16, 2008]Source: [Chang woo Pyo, Zhou Lan, Fumihide Kojima, Tuncer Baykas, Chin Sean Sum, Junyi Wang, Azizur Rahman, Hiroyuki Nakase, Hiroshi Harada, Shuzo Kato] Company [National Institute of Information and Communications Technology (NICT)]Address1[3-4 Hikari-no-oka, Yokosuka-shi, Kanagawa 239-0847, Japan]Voice1:[+81-46-847-5074] , FAX1: [+81-46-847-5440]E-Mail[]Re: [In response to TG3c Call for Proposals (IEEE P802.15-07-0586-02-003c)]Abstract: [Questions/Comments on AV-OFDM MAC]Purpose: [To be considered in TG3C baseline document.]Notice: This document has been prepared to assist the IEEE P802.15. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein.Release: The contributors acknowledge and accept that this contribution becomes the property of IEEE and may be made publicly available by P802.15.
doc.: IEEE 802.15-08-0240-00-003c
Submission Slide 2
April, 2008
NICT
Summary• Identify the “need-to-clarify” items in AV-
OFDM
doc.: IEEE 802.15-08-0240-00-003c
Submission Slide 3
April, 2008
NICT
SCAN• Comments are shown in the next page
SC AV-OFDMSCAN CHs 4 CHs (appendix A) 12 LRP CHs (appendix
A)
SCAN Procedure - SCAN by Omni /Quasi-Omni beams (The number of Quasi-omni beams is upto 4)
SCAN by Omni
SCAN information ChannelRatingList ChannelRatingList
Piconet detection By beacon of base (common) rate – LRP1 (50Mbps)
By beacon of base rate (TBD)
Channel Switching Time (pPHYChannelSwitchTime)
100us 1000us
Channel clear assessment (CCA) time
5us 9us
doc.: IEEE 802.15-08-0240-00-003c
Submission Slide 4
April, 2008
NICT
Comments for AV-OFDM (related to SCAN)
• Comment 1– Which channel is used to scan in LRP channels (LRP1, LRP2, or
LRP3)
• Comment 2– What is the definition of omni - covering 360 degree or part of 360
degree– If omni is covering the part or 360 degree, how many directions are
supported by each device
• Comment 3– What is the definition of base rate of beacon
• Comment 4– The reason of channel switching time of 1000us and CCA time of 9us
doc.: IEEE 802.15-08-0240-00-003c
Submission Slide 5
April, 2008
NICT
Starting a piconet• Comments are shown in the next page
SC AV-OFDMChannel Selection
With least amount of interference defined in 802.15.3b
Implementation dependent
Superframe 1. Beacon : - Upto 4 Omni/Quasi-omni
beacons (Directional beacons)- Base (common) rate – LRP1
1. Beacon : - Omni beacon- Base rate (TBD)
2. CAP : - Control signals for the same rate of beacon (base rate)- Data for any other rate- Sub-CAPs for multiple Quasi-omni beacons
2. CAP - 4 LRP rates (2.5, 3.8, 5.1, and 10.2Mbps)
3. CTAP : All available rates 3. CTAP : HRP, LRPs and directional LRPs
Superframe resolution
1us 1us
doc.: IEEE 802.15-08-0240-00-003c
Submission Slide 6
April, 2008
NICT
Comments for AV-OFDM (related to starting a piconet)
• Comment 5– The reason of channel selection not complying with
15.3• Comment 6
– Does AV-OFDM support directional beacons • Comment 7– What is the date rate for beacon (related to comment 2)
• Comment 8– What data rates are supported in CAP
doc.: IEEE 802.15-08-0240-00-003c
Submission Slide 7
April, 2008
NICT
Association• Comments are shown in the next page
SC AV-OFDMPNC-DEV Association
Association in CAP Association in CAP
Base (common) rate for association
Base rate (TBD) for association
Qmni/Quasi-Omni antenna Omni antenna
DEV-DEV Association
Association in CTAP -
Base (common) rate -
Omni/Quasi-Omni antenna -
doc.: IEEE 802.15-08-0240-00-003c
Submission Slide 8
April, 2008
NICT
Comments for AV-OFDM (related to Association)
• Comment 9– What data rate is used for association
• Comment 10– AV-OFDM is no procedure of DEV-DEV
association
doc.: IEEE 802.15-08-0240-00-003c
Submission Slide 9
April, 2008
NICT
Beamforming• Comments are shown in the next page
SC AV-OFDM
Beamforming Ant.
Beamforming Ant. or Sectorized Ant.
Beamforming Ant. or upto 8 directional Ant.
Beamforming operations
PNC and DEV beamforming PNC and DEV beamforming
DEV and DEV beamforming No description for DEV and DEV beamforming
PNC and DEV beamforming
- Beamforming in CTA- Symmetric/Asymmetric
Tx/Rx ant. beamforming support
- Periodical beam-tracking
-Omni beacon only-RX diversity training field in preamble
DEV and DEV beamfoming
- Beamforming in CTA- Symmetric/Asymmetric
Tx/Rx ant. beamforming support
- Periodical beam-tracking
?
doc.: IEEE 802.15-08-0240-00-003c
Submission Slide 10
April, 2008
NICT
Comments for AV-OFDM (related to Beamforming)
• Comment 11– What is the difference between beamforming antenna and
directional antenna
• Comment 12– What is the function of RX diversity field in preamble
• Comment 13– Does AV-OFDM support symmetric and asymmetric Tx and Rx
ant. in beamforming
doc.: IEEE 802.15-08-0240-00-003c
Submission Slide 11
April, 2008
NICT
Channel probing• Comments are shown in the next page
SC AV-OFDMChannel probing Optional function ?
Channel probing operations
PNC to DEV and DEV to DEV channel probing in CTA
In CTA ?
Data used for measurement
Regular data frame ?
Way to feedback MAC header of Imm-ACK or Dly-ACK
Channel probing response command ?
Channel status information
RSSIr, SINR, Suggested CES length, FER
RSSI, SNR, recommended PHY mode
doc.: IEEE 802.15-08-0240-00-003c
Submission Slide 12
April, 2008
NICT
Comments for AV-OFDM (related to channel probing)
• Comment 14– Does AV-OFDM support channel probing – If support, how to perform channel probing
doc.: IEEE 802.15-08-0240-00-003c
Submission Slide 13
April, 2008
NICT
Streaming• Comments are shown in the next page
SC AV-OFDMStreaming in SF CTAP CTAP
Maximum frame size
8M octets 7M octets for HRP,4K octets for LRP
Minimum fragment size
512 octets TBD
Aggregation - Option- Maximum subframe size for
aggregation = 1M octets- Available number of aggregated
subframes = 8- Two types of aggregation support 1) Standard aggregation 2) low latency aggregation
- Option- Maximum subframe size for aggregation = 1M octets- Available number of aggregated subframes = 7
Block ACK - Retransmission of aggregated subframes
- ACK group (usage of ACK group is TBD)
Directional ACK ACK is the same data rate of stream Directional ACK (Directional LRP)
doc.: IEEE 802.15-08-0240-00-003c
Submission Slide 14
April, 2008
NICT
Comments for AV-OFDM (related to streaming)
• Comment 15– What is the value for the minimum fragment size
• Comment 16– What is the definition of ACK group
• Comment 17– Details of retransmission procedure in AV-OFDM
• Comment 18– What is the data rate for directional ACK
• Comment 19– The reason of directional ACK not complying to 15.3b
• ACK information of directional ACK is included in header not payload
doc.: IEEE 802.15-08-0240-00-003c
Submission Slide 15
April, 2008
NICT
Appendix: Channel IndexSC AV-OFDM
CHNL_ID Channel index CHNL_ID HRP Channel Index
LRP Channel Index
1 CH1 1 HRP1 LRP1
2 CH2 2 HRP2 LRP1
3 CH3 3 HRP3 LRP1
4 CH4 4 HRP4 LRP1
5 HRP1 LRP2
6 HRP2 LRP2
7 HRP3 LRP2
8 HRP4 LRP2
9 HRP1 LRP3
10 HRP2 LRP3
11 HRP3 LRP3
12 HRP4 LRP3