Transcript • Spatial Sharing Mechanism in 802.11aj (NT) - 11-14/0009r1
January 2014 doc.: IEEE 802.11-13/1293r3
Opportunistic Transmissions in Multiple Alternative Channels in 802.11aj (60GHz New Technique Proposal) Date:
2013-11-13
Presenter:
Name Company Address Phone
Khiam-Boon Png Institute for Infocomm Research (I2R) / CWPAN 1 Fusionopolis Way, #21-01 Connexis, Singapore 65-6408 2433
[email protected] star.edu.sg
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January 2014
Author List
doc.: IEEE 802.11-13/1293r3
Name CHEN, Jiamin CHEN, Qian CHIN, Francois GAO, Bo HAO, Peng HONG, Wei LI, Dejian LI, Zhiqiang LIU, Zongru LIU, Pei LU, Su PENG, Xiaoming PNG, Khiam Boon SUN, Bo WANG, Haiming YUE, Guangrong ZHUO, Lan ZOU, Weixia Company Huawei /CWPAN I2R / CWPAN I2R /CWPAN Tsinghua /CWPAN JUST /CWPAN SEU /CWPAN Huawei/CWPAN IMECAS /CWPAN Hangzhou Millimeter Wave /CWPAN Hisilicon /CWPAN Huawei /CWPAN I2R/CWPAN I2R /CWPAN ZTE/CWPAN SEU /CWPAN UESTC/CWPAN CESI/CWPAN BUPT/CWPAN Email [email protected]
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January 2014 doc.: IEEE 802.11-13/1293r3
Abstract
• This presentation is part and in support of the complete proposal described in IEEE 802.11-13-1301r1 (slides) and IEEE 802.11-13-1302r0 (text) • This document is to propose a solution for opportunistic transmission over alternative channels to increase the network throughput; • In this revision, we highlight the difference between this proposal and the existing Tunneled Direct Link Set-up (TDLS) mechanism in 802.11z standards.
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January 2014 doc.: IEEE 802.11-13/1293r3
Background
• Proposed 6 logical channels for 802.11aj (60 GHz) [1]:
– 2 large bands with 2.16 GHz bandwidth: 2 & 3 – 4 small bands with 1.08 GHz bandwidth: 5, 6, 7 & 8.
Submission
Figure 1.
Proposed Channelization for 802.11aj (60GHz). Slide 4 KB Png
January 2014 doc.: IEEE 802.11-13/1293r3
Motivations
• Objective: To increase the system throughput of a network .
• Definitions: – Assume that a network with PCP/AP 1 setting up in Channel 5.
– Channel 5 is called dedicated channel and other channels, i.e., 6, 7, 8 and 3, are called alternative channels.
• Method: If PCP/AP 1 cannot allocate enough time slots in Channel 5 to satisfy the traffic scheduling requirement, we can use an
opportunistic transmission mechanism
to schedule the transmissions (e.g., pair of STAs Src 1 and Dst 1, and pair of STAs Src 2 and Dst 2) in alternative channels 6, 7 or/and 8 or 3.
Submission
2 3 5 6 7 8 PCP/AP 1 Src 1
Src 2
Dst 1 Dst 2 Figure 2.
Example of opportunistic transmission mechanism.
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January 2014
• • • •
doc.: IEEE 802.11-13/1293r3
Opportunistic Transmission Mechanism
Source STA Src 1 sends the allocation request, then PCP/AP 1 grants to allocate the service period (SP) for transmission pair (Src 1, Dst 1) in Channel 7 (8 or 3).
Both Src 1 and Dst 1 scan in Channel 3 for at least aMaxBIDuration . If Channel 3 is available, Src 1 and Dst 1 proceed to do beamforming and transmit in the assigned SPs. Otherwise, Src 1 or Dst 1 will report the failure reasons to PCP/AP 1 after the scanning. The allocated SPs in Channel 7 (8 or 3) cannot extend the duration up to N × aMaxBIDuration .
After that, Src 1 and Dst 1 can either switch back to Channel 5 or stay in Chanel 7 (8 or 3). In either way, they must suspend transmissions in Channel 7 (8 or 3) for a period of ( B – 1) × aMaxBIDuration.
Timeslot for Src 1 to Report Timeslot for Dst 1 to Report Dedicated Channel 5 Schedule Alternative Channel Usage BI ...
aMaxBIDuration Scan Phase Alternative Channel 7/8 DTT B aMaxBIDuration BFT BI BI N x aMaxBIDuration ...
Transmission Phase ...
B BI BI (B-1) x aMaxBIDuration Suspension Phase aMaxBIDuration Scan Phase Submission Beamforming Training Echo Beacon Frame Transmission
Figure 3.
Example of opportunistic transmission mechanism Slide 6 KB Png
January 2014
BHI DTI BHI DTI Src 1<->Dst1 Src 2<->Dst 2 aMaxBIDuration aMaxBIDuration
doc.: IEEE 802.11-13/1293r3
BHI
The detailed Solution
DTI echo SP1 BHI SP2 DTI echo SP1 SP2 1.
Src 1, Src 2, Dst 1 and Dst 2 scan Channel 3 for at least aMaxBIDuration during which any networks in operation in Channel 3 will have transmitted a notification packet to broadcast its existence.
2.
3.
4.
PCP/AP 1 will schedule time slots in Channel 7 (8 or 3) at the end of the scanning period – assigned to each device If PCP/AP 1 does not receive any report, it will assume that the alternative channel is unoccupied and the devices have proceeded with their scheduled transmissions. – If any devices report that Channel 3 is occupied, PCP/AP 1 will inform the other devices to stop transmissions in Channel 7 (8 or 3) when they next return to Channel 5.
After the scanning period, (Src 1, Dst 1) and (Src 2, Dst 2) will commence on their scheduled SP1 and SP2, respectively, if they did not detect the existence of a network in operation in the alternative channel. For each pair of devices, data transmission is preceded by a setup phase where the source – and destination device exchange information to facilitate the data transmission. If the setup phase failed, both devices will also return to Channel 5 and report accordingly to PCP/AP 1.
Figure 4.
Modified SSW-Feedback/SSW-ACK frame format and SSW Feedback field Submission Slide 7 KB Png
January 2014
BHI
doc.: IEEE 802.11-13/1293r3
The detailed Solution (Cont’d)
DTI BHI DTI DTI BHI BHI DTI BHI DTI BHI DTI Src 1<->Dst 1 Src 2<->Dst 2 aMaxBIDuration aMaxBIDuration echo SP1 SP2 echo SP1 SP2 ...
...
N × aMaxBIDuration (B -1) × aMaxBIDuration 5.
6.
7.
The scheduled transmissions of the two pairs of devices can either run successively or – concurrently if interferences between the pairs are minimal. If the transmissions are scheduled to run successively, the second pair of devices, Src 2 and Dst 2 can continue to scan Channel 3 to ensure that no devices, other than Src 1 and Dst 1, are transmitting in Channel 3. – Regardless of successive or parallel transmissions, the total duration of the scheduled transmissions shall be upper-bounded by N × aMaxBIDuration.
At the end of the N × aMaxBIDuration , the devices can either switch back to the – dedicated channel or stay in the alternative channel. In either way, the devices will suspend any transmissions in the alterative channel for a minimum period of (B - 1) × aMaxBIDuration .
One of the source devices is designated as the prime source which will, at the start of each transmission block, transmit an echo beacon frame in Channel 3 that mimics the – beacon frame sent by PCP/AP 1 in Channel 2. All other transmissions in Channel 3 from other devices in the network are not allowed during the transmission of the echo beacon frame.
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January 2014
BHI
doc.: IEEE 802.11-13/1293r3
The detailed Solution (Cont’d)
BHI DTI DTI BHI DTI BHI DTI BHI DTI BHI DTI BHI DTI Src 1<->Dst 1 aMaxBIDuration echo SP1 echo SP1 ...
...
Src 2<->Dst 2 aMaxBIDuration SP2 SP2 8.
9.
10.
N × aMaxBIDuration (B -1) × aMaxBIDuration At the end of (B - 1) × aMaxBIDuration where transmissions are suspended, all the devices will again scan Channel 3 for a duration exceeding aMaxBIDuration before the transmissions begin anew.
(Src 1, Dst 1) and (Src 2, Dst 2) will periodically, if required, return to Channel 5 when PCP/AP 1 is scheduled to transmit a beacon frame to maintain coordination and – synchronization with PCP/AP 1. Changes in scheduled transmissions can be made by PCP/AP 1 during these times too.
At the end of the scheduled transmissions, Src 1, Dst 1 and Src 2, Dst 2 will return to Channel 5 to await new schedules.
11.
To maintain the coordination and synchronization, Src 1, Dst 1 and Src 2, Dst 2 synchronize with PCP/AP 1 through receiving time stamps in the PCP/AP 1’s broadcast periodically with the time interval between consecutive receptions of the time stamp short enough that a rough synchronization can be achieved throughout the transmission in Channel 7 (8 or 3).
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January 2014 doc.: IEEE 802.11-13/1293r3
Benefits of the proposed solution
• • • • • Increase network throughput in an opportunistic way when the adjacent channel is available without necessitating additional hardware complexity on the devices in the network.
Enables a single network to be operated across multiple channel bands, where the network controller co-ordinate spectrum access in a dedicated channel band and schedule opportunistic spectrum access in other alternative channel bands .
Ensures that scheduled opportunistic transmissions in alternative channels do not disrupt other networks operating in the alternative channels.
Ensures other networks that want to start up in the alternative channels will not be hindered by a single network operating in multiple channel bands.
Is well-suited for implementation as a set of MAC protocols which allows efficient coordination of a network operating across multiple channel bands.
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January 2014 doc.: IEEE 802.11-13/1293r3
Comparisons with TDLS
• The motivation of the proposed scheme are similar to TDLS; a method to allow two devices to have direct wireless link outside of the network’s channel without any user intervention.
• Proposed method differs from TDLS in terms of operation protocols – TDLS is an autonomous scheme that are independent of AP support, the proposed method, taking into account the unique feature of 60 GHz communications where channel access is directed by PCP/AP, uses PCP/AP to direct the operation.
– The proposed method establish the protocols to allows for SP as well as CBAP in the alternative channel.
– To minimize interference to other networks that may be operating in the alternative channels, we define scanning period to make sure channel is unoccupied.
– To prevent the cannibalization of alternative channel resources, the proposed method establish period of non transmission to allow other networks to start up.
Submission Slide 11 Xiaoming Peng
January 2014 doc.: IEEE 802.11-13/1293r3
Conclusions
• This presentation is part and in support of the complete proposal described in IEEE 802.11-13-1301r1 (slides) and IEEE 802.11-13-1302r0 (text) • Proposed a solution for opportunistic transmission over alternative channels to increase the network throughput; • It may be useful for some applications, e.g. data center; • It applies to both large band and small band.
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January 2014 doc.: IEEE 802.11-13/1293r3
Reference
[1] 11-12-1197r0 - Physical Channel Consideration for Chinese 60GHz band [2] 11-13-0176r0 - Proposal of Channelization for 802.11aj
[3] 11-13-0175r1 - Backward Compatibility Feature for 802.11aj
[4] 11-12-0140r9 - IEEE 802.11.aj PAR [5] 11-12-0141r7 - IEEE 802.11.aj 5C Submission Slide 13 KB Png
January 2014
Thank YOU
doc.: IEEE 802.11-13/1293r3
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