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Collaboration between 2.4/5 and 60 GHz

Collaboration between 2.4/5 and 60 GHz. Authors:. Date: 2010-05-19. Abstract. 60 GHz is by itself a promising technology that will provide multi-Gbps throughput at short range.

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Collaboration between 2.4/5 and 60 GHz

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  1. Collaboration between 2.4/5 and 60 GHz Authors: Date: 2010-05-19

  2. Abstract • 60 GHz is by itself a promising technology that will provide multi-Gbps throughput at short range. • The inclusion in TGad of fast session transfer feature opens the door to a convergence between all past and future 802.11 technologies and to potential improvements • of each technology, • and of the overall home network. • In [3], we have presented a simple solution for fast session transfer which satisfies one of the potential use cases that can be envisioned. • In this proposal, we propose new use cases, based on various means of collaboration between 2.4/5 and 60 GHz to extend FST.

  3. Use case 12.4/5GHz Assisted 60GHz Extended service set (ESS) with multiple APs in a house, with an ethernet distributed system (DS) One AP at 2.4/5GHz covering the whole house, called central AP Multiple in-room AP/PCP at 60GHz, called secondary APs "Central" and "secondary" terms are introduced to indicate that: Central AP is a repository for configuration parameters of the ESS Secondary APs can retrieve configuration parameters from the central AP May 2010 Slide 3

  4. WiFi 5GHz ( 500 Mbps) WiFi 60GHz ( 1 Gbps) May 2010 Use case 12.4/5GHz Assisted 60GHz Step 1: STA A with an flow using 2.4/5GHz band to the central AP (Green line) STA A Secondary AP Media server Ethernet connexion between APs Central AP Slide 4

  5. WiFi 5GHz ( 500 Mbps) WiFi 60GHz ( 1 Gbps) May 2010 Use case 12.4/5GHz Assisted 60GHz Step 2: STA A performs a FST/roaming between the central AP and the secondary 60GHz AP, so that the selected flow could be transmitted via the secondary AP and the ethernet link to the central AP, in a seamless way STA A Secondary AP Media server Ethernet connexion between APs central AP Slide 5

  6. How to make such a use case work? It seems that 11r is not sufficient to enable this use case stream-based session transfer not possible the fastness constraints may not be satisfied 11r combined with an extension of FST could be the solution. To make it seamless, it seems FST would require transparent mode with multiple endpoints (central AP to a secondary AP) e.g. sharing of security, association, etc between central and secondary APs. possible solution: distribute security and assocation parameters to allow auto-configuration of the secondary APs by the central AP. enable communications between central and secondary APs via the 2.4/5GHz backbone (AP to AP via action frames) May 2010 Slide 6

  7. Use case 22.4/5GHz Assisted 60GHz May 2010 The use of 2.4/5GHz management to discover, assist training, and schedule 60GHz transmission is a solution to improve the performance of 802.11ad at larger range 60G Link assisted by 2.4/5G Media server Wifi 60GHz ( 1 Gbps) Wifi 5GHz ( 500 Mbps) AP Slide 7 Slide 7

  8. Beamforming would be the key technology to enhance 60GHz range However, beamforming could only be functional after discovery and training of the target device If 802.11a/b/g/n can coincide with 802.11ad, they can be used to better facilitate 60GHz beamforming March 2010 2.4/5GHz Assisted 60GHz - Overview Slide 8

  9. Several ways to effectively use 2.4/5GHz frames to assist 60GHz operation were previously proposed in [4] 2.4/5GHz Beaconing Provide 60GHz service discovery, especially when STAs are out of 60GHz omni range Share 60GHz Beacon Offset (i.e. TX timing) so STAs can discover when to update beamform information or retrain if necessary. Provide 60GHz Scheduling Information that can be used to adjust the RX/TX beam-pattern to the intended receiver/transmitter 2.4/5GHz Management Frames assisted 60GHz scheduling Can facilitate better 60 GHz operation via some frames (e.g. Re-scheduling Frame) Communicate with all STAs in the BSS via 2.4/5GHz frames; single STA via 60GHz 2.4/5GHz Management Frames assisted 60GHz training Aid between STAs whose 60GHz training information is not available or too aged Use frames to initiate 60GHz training procedure 2.4/5GHz Assisted 60GHz - Options Slide 9

  10. It will not be possible to cover entire home with a single 60GHz network 60 GHz should beused to provide intra-room ultra-fast connections.  In room 60 GHz improves the link reliability and the link robustness in the presence of interferences 2.4/5 GHz should be used to provide inter-room connections 2.4/5 GHz should be used as well as intra-room connections in case of mobility where a 60GHz link would not be maintained Use case 3Backhaul at 2.4/5GHz, in-room 60GHz Slide 10

  11. WiFi 5GHz ( 500 Mbps) WiFi 60GHz ( 1 Gbps) Use case 3Backhaul at 2.4/5GHz, in-room 60GHz Media server 60G P2P setup with 2.4/5G AP Slide 11

  12. Simple extension of TDLS 2.4/5 GHz manages setup procedure, and 60 GHz provides a multi-Gbps direct link Discovering TDLS capable STAs in the same BSS is easy because 2.4/5 GHz has a wider and omni directional range AP 2.4/5G 60G DLS setup request DLS setup response STA2 STA1 Direct link 2.4/5GHz DLS of 60GHz P2P Slide 12

  13. Device discovery and beamforming training could be started with 2.4/5GHz signaling. 2.4/5GHz 2.4/5GHz 2.4/5GHz 60GHz 60GHz 60GHz Setup signal flow of 60GHz P2P DLS setup response DLS setup request AP Waiting for Response 60GHz Training Frame Beamformed Data STA1 DLS setup request STA2 DLS setup response Waiting for Training Frame 60GHz Training Feedback Slide 13

  14. Collaboration between the 2.4/5 and 60 GHz bands would enable user expectations for 802.11ad to be met Fast session transfer could enable stream-based "roaming". 2.4/5 GHz assisted 60 GHz improves discovery and assists training and scheduling of 60 GHz transmission 2.4/5 assisted DLS of 60 GHz permits 60 GHz to be used for in-room ultra-fast connections while 2.4/5 provides inter-room connections and manages 60 GHz links We believe that these solutions would improve the overall home network Conclusions May 2010 Slide 14 Slide 14

  15. [1] J. Benko et al, “5-60 GHz use cases”, 802/11-09-0835r0 [2] L. Cariou et al, “Fast Session Transfer use cases”, 802/11-10-0134r0 [3] L. Cariou et al, “Fast Session Transfer”, 802/11-10-0491r1 [4] Y. Morioka et al, “802.11ad New Technique Proposal”, 802/11-10-0259r2 Reference

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