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doc.: IEEE 802.11-13/0071r0January 2013
Submission
Channel indication in RAW/TWTDate: 2013-01-14
Authors:
Merlin, Qualcomm
Slide 1
Name Affiliations Address Phone email Simone Merlin Qualcomm 5775 Morehouse Dr,
San Diego, CA 8588451243 [email protected]
Alfred Asterjadhi Qualcomm
Amin Jafarian Qualcomm
Bin Tian Qualcomm
Santosh Abraham Qualcomm
Menzo Wentink Qualcomm
Hemanth Sampath Qualcomm
VK Jones Qualcomm
Sun, Bo ZTE [email protected]
Lv, Kaiying ZTE [email protected]
Huai-Rong Shao Samsung [email protected]
Chiu Ngo Samsung [email protected]
Minho Cheong ETRI 138 Gajeongno, Yuseong-gu, Dajeon, Korea
+82 42 860 5635
Jae Seung Lee ETRI [email protected]
Hyoungjin Kwon ETRI [email protected]
Heejung Yu ETRI [email protected]
Jaewoo Park ETRI [email protected]
Sok-kyu Lee ETRI [email protected]
Sayantan Choudhury Nokia
Klaus Doppler Nokia
Chittabrata Ghosh Nokia
Esa Tuomaala Nokia
doc.: IEEE 802.11-13/0071r0January 2013
Submission Merlin, Qualcomm
Slide 2
Name Affiliations Address Phone email Minyoung Park Intel Corp. [email protected]
Tom Tetzlaff Intel Corp. [email protected]
Emily Qi Intel Corp. [email protected]
Hongyuan Zhang Marvell [email protected]
Sudhir Srinivasa Marvell [email protected]
Su Khiong Yong Marvell [email protected]
Yongho Seok LG Electronics LG R&D Complex Anyang-Shi, Kyungki-Do, Korea
+82-31-450-1947 [email protected]
Jinsoo Choi LG Electronics
Jeongki Kim LG Electronics
Jin Sam Kwak LG Electronics
Matthew Fischer Broadcom 190 Mathilda Place, Sunnyvale, CA
+1 408 543 3370 [email protected]
Eric Wong Broadcom [email protected]
Rojan Chitrakar Panasonic [email protected]
Ken Mori Panasonic [email protected]
doc.: IEEE 802.11-13/0071r0January 2013
Submission Slide 3 Merlin, Qualcomm
doc.: IEEE 802.11-13/0071r0January 2013
Submission
Summary
• Narrowband channel selection protocol was adopted [1]– Narrowband transmission (1/2 MHz) may suffer from high diversity loss– The approved concept [1] allows STAs to transmit to the AP on a preferred
channel within the BSS BW; more detailed recap in next slide– Flexible multichannel access allow STAs to avoid fading channels
• Some MAC aspects need be defined
• We propose a simple way to manage the MAC for multichannel access– Solves the multichannel hidden node issue– Is similar to frequency hopping solutions from other standards– Enables frequency channel selection also for APs that are only able to
detect packet on a single channel
Slide 4 Merlin, Qualcomm
doc.: IEEE 802.11-13/0071r0January 2013
Submission
Frequency selective transmissions - Recap
• AP Assumptions:• AP is able to detect and receive a packet on any of the channels it indicates in the beacon
• May be one channel (primary) or multiple channels within the BSS BW• Detection on multiple channels requires special hardware capabilities
• AP is not able to detect/decode parallel transmissions on different channels
• Beacons or sounding signals sent after the beacon can be used by a STA to estimate the best channel to be used
• AP may send more than one Beacon per TBTT on more than one subchannel of the BSS• Beacons include indication of following sounding frames
• STAs are allowed to choose any permitted 2 MHz subchannel of a wideband BSS on which to transmit and receive
• Beacons include the indication of the allowed channels for transmission• MAC needs to ensure that no parallel transmissions on different channels occur
Slide 5 Merlin, Qualcomm
doc.: IEEE 802.11-13/0071r0January 2013
Submission
MAC
• We want to enable the following MAC behavior– Within a beacon period, AP defines multiple time intervals and defines a ‘temporary
primary’ channel per each interval of time• ‘temporary primary’ channel is the one where CSMA is done and where AP is able to detect a
packet: all transmissions shall include the temporary primary channel
• Benefits– At each moment in time STAs contend on a single channel: no parallel transmissions– AP can detect packets only on one channel only (the temporary primary channel)– Within a beacon period each STA has still the chance to transmit on the preferred channel
(allocated intervals should cover all the channels)
Slide 6 Merlin, Qualcomm
BCN
BCN
CH1
CH2
TBTT
Interval 1CSMA done on CH1
TBTT
Interval 2CSMA done on CH2
doc.: IEEE 802.11-13/0071r0January 2013
Submission
Use of RAW• 11ah adopted the definition of a Restricted Access Window [2]
– An interval of time during which the access is restricted to a group of STAs– RAWs are defined in a beacon– The concept of a Periodic RAW was also introduced [3]
• We can reuse the RAW definition to– Define the interval of time and indicate a ‘temporary primary channel’
• Add a channel indication field in RPS IE [2]• Each RAW may be advertised in its corresponding Beacon
– Allow all STAs to access during a RAW, so that the only restriction is the channel that can be used during the RAW
Slide 7 Merlin, Qualcomm
TBTT
BCN
BCN
CH1
CH2
TBTT
RAW 1CSMA done on CH1
RAW 2CSMA done on CH2
doc.: IEEE 802.11-13/0071r0January 2013
Submission
RAW Parameter Set Element• 4.4.3.1.2 in Extend SFD defines the fields in the RAW PS
IE:
Slide 8 Merlin, Qualcomm
Feature Value Interpretation
Page ID TBD bits Indicates the page index for hierarchical AID (based on hierarchical AID) of the allocated group
Block Offset TBD bits Assuming 32 blocks per page, these bits indicate the starting block index of the allocated group
Block Range TBD bits Indicates the number of blocks (starting from the block offset) for the allocated group
RAW Start Time 8 bits Duration in TU from end of beacon transmission to RAW Start time
RAW Duration TBD bits Duration of RAW in TU
Channel TBD bits Indicates the ‘primary’ channel during this RAW, where CSMA is done
Access restricted to paged STA only
2 bits Bit 1: Set to 1 if only STA with their TIM bit set to 1 are allowed to perform UL transmissionsBit 2: Set to 1 if RAW is reserved for frames with duration smaller than slot duration, such as PS-Polls / trigger frames (ignored if Bit 1 is not set)
Group/Resource allocation frame indication
1 bit Set to 1 to indicate if STAs need to wake up at the beginning of the RAW to receive group addressed frames such as resource allocation (format of the resource allocation frame TBD)
Slot definition TBD bits Include• Slot duration signaling • Slot assignment to STA• Cross boundary transmissions allowed/not allowedFormat is TBD
Include signaling that allows to indicate a group that includes all the STAs (‘omni group’)
doc.: IEEE 802.11-13/0071r0January 2013
Submission
TWT
Slide 9 Merlin, Qualcomm
• 11ah also defines the concept of TWT [4]– STA and AP agree on a time where STA is awake for communication– STA can sleep otherwise
• If AP operates with a frequency selective MAC protocol, STA waking up at TWT needs to know on which channel to tune its receiver/transmitter
• We propose to include in TWT and indication of the channel to be used
BCN
PIFS separated Beacon
BCN
CH1
CH2
TBTT AP on CH1
TWT for STAn on CH2
TWT for STAn on CH1
AP on CH2
doc.: IEEE 802.11-13/0071r0January 2013
Submission
Conclusion
• We propose to add to the RAW/TWT definition an indication of the channel to be used as ‘temporary primary channel’– Implicitly avoids the MAC issue related to parallel transmissions on different
channels • At each moment in time STAs contend on a single channel and transmit at least on
that channel – Enables frequency selective protocol for APs that can detect packets on a single
channel (the temporary primary channel)
Slide 10 Merlin, Qualcomm
doc.: IEEE 802.11-13/0071r0January 2013
Submission
Straw poll 1
• Do you agree to include a channel indication in the RPS IE?
Slide 11 Merlin, Qualcomm
doc.: IEEE 802.11-13/0071r0January 2013
Submission
Straw poll 2
• Do you agree to allow for the indication of a ‘omni group’ in the RSP IE?
Slide 12 Merlin, Qualcomm
doc.: IEEE 802.11-13/0071r0January 2013
Submission
Straw poll 3
• Do you agree to include a channel indication in TWT setup?
Slide 13 Merlin, Qualcomm
doc.: IEEE 802.11-13/0071r0January 2013
Submission
[1] 11-12-1338-00-00ah-frequency-selective-transmission.pptx
[2] 11-12-0843-00-00ah-restricted-access-window-signaling-for-uplink-channel-access.pptx
[3] 11-12-1311-00-00ah-periodic-channel-access.pptx
[4] 11-12-0823-00-00ah-targetwaketime.pptx
Slide 14 Merlin, Qualcomm
References