Enhancing Mobile Offloading with Relay in Dense Environments
Highlighting the significance of relays in mobile offloading use cases, this document discusses issues and scenarios related to IEEE 802.11 protocols, particularly in the context of 5G cellular network offloading to 11ad/ay for enhanced bandwidth. Various deployment scenarios, alternative solutions, and backhaul considerations are explored, emphasizing the role of relays in extending coverage and addressing connectivity challenges in high-density settings like stadiums and public spaces.
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September 2016 doc.: IEEE 802.11-16/1140r0 Relay Enhancement Date: 2016-09-09 Authors: Name Hiroaki Honma Affiliations Address KDDI R&D Laboratories Phone email ho-honma at kddilabs.jp yunoki at kddilabs.jp 2-15-1 Ohara, Fujimino-shi, Saitama, 356-8502, Japan Katsuo Yunoki Submission Slide 1 Hiroaki Honma, KDDI R&D Labs.
September 2016 doc.: IEEE 802.11-16/1140r0 Abstract This submission highlights the importance of relays in mobile offloading use case in public space. Some issues in 11ad relaying are discussed. Submission Slide 2 Hiroaki Honma, KDDI R&D Labs.
September 2016 doc.: IEEE 802.11-16/1140r0 Background Mobile operators focus on 5G cellular for coming 2020. It is very attractive for such operators to offload 5G cellular traffic to 11ad/ay which has lager bandwidth than 11ax, especially in dense environments. WFA also highlighted mobile offloading as the 2nd main stream use case. It potentially has a big market. [1][2] However, mmWave communication has issues like small coverage, blocking, lack of stability, etc. Submission Slide 3 Hiroaki Honma, KDDI R&D Labs.
September 2016 doc.: IEEE 802.11-16/1140r0 Deployment Scenarios The issues will be compensated by deploying multiple APs. However, 11ay APs can cover limited areas. Sometimes 11ay STAs may be out of the coverage area due to STAs being out of range or blocking by human bodies/other obstacles. AP AP blockage blockage Station out of range out of range Submission Slide 4 Hiroaki Honma, KDDI R&D Labs.
September 2016 doc.: IEEE 802.11-16/1140r0 Alternative Scenarios Relay will be an alternative scenario to compensate insufficiencies in 11ay coverages for offloading. AP AP Station relay relay Submission Slide 5 Hiroaki Honma, KDDI R&D Labs.
September 2016 doc.: IEEE 802.11-16/1140r0 Backhaul Scenario Relay may also be used for AP w/o wired (or wireless) BH. wired BH AP w/o BH wired BH AP AP Station Submission Slide 6 Hiroaki Honma, KDDI R&D Labs.
September 2016 doc.: IEEE 802.11-16/1140r0 Use case of range extension with relay It could be applicable in case of low mobility use cases (ex: Stadium, Station). Blockage by human body Blockage by pole Stadium Station Submission Slide 7 Hiroaki Honma, KDDI R&D Labs.
September 2016 doc.: IEEE 802.11-16/1140r0 Problems with 11ad Relaying Ref. [3] indicated the following problems in 11ad relaying: 1. Lack of support for relay setup between STAs that are outside mutual transmission range (Slide 12). 2. Lack of coverage extension procedures (Slide 13). 3. Retransmission inefficiency due to lack of scheduling flexibility of fixed First and Second Periods (Slide 14). 4. Lack of support for multi-hop relaying (Slide 15). Submission Slide 8 Hiroaki Honma, KDDI R&D Labs.
September 2016 doc.: IEEE 802.11-16/1140r0 Conclusion Relay for range extension is an important feature for mobile offloading scenario. Some issues should be examined and resolved for 11ay relay applications. Submission Slide 9 Hiroaki Honma, KDDI R&D Labs.
September 2016 doc.: IEEE 802.11-16/1140r0 Straw Poll Do you agree to add the following text into 11ay SFD? The 11ay spec shall include relay enhancement to enable range extension. Y/N/A = Submission Slide 10 Hiroaki Honma, KDDI R&D Labs.
September 2016 doc.: IEEE 802.11-16/1140r0 References [1] IEEE 802.11ay Usage Scenarios, 11-15/625r3 (Sep. 2015) [2] 20150707 Wi-Fi Alliance feedback on 802.11 Task Group AY usage models, 11-15/934r0 (Jul. 2015) [3] Relays for 11ay, 11-16/337r0 (Mar. 2016) Submission Slide 11 Hiroaki Honma, KDDI R&D Labs.
September 2016 doc.: IEEE 802.11-16/1140r0 Backups Submission Slide 12 Hiroaki Honma, KDDI R&D Labs.
September 2016 doc.: IEEE 802.11-16/1140r0 Copy from [3] Problems with 11ad Relaying (1/4) Lack of support for relay setup between STAs that are outside mutual transmission range. Both Source (S-REDS) and Destination (D-REDS) nodes must be part of the BSS/PBSS, and have a direct link setup between them before initiating relay link setup. LEGEND Coverage of AP/PCP Coverage of STA AP/PCP AP/PCP STA link STA STA direct link STA 1 (S-REDS) STA 3 (D-REDS) STA 2 11ad relay procedure does not support relay setup between STA1 and STA3 as they are outside of mutual transmission range. STA2 relays STA1 STA3 traffic and relieves the load on AP/PCP. Submission Slide 13 Hiroaki Honma, KDDI R&D Labs.
September 2016 doc.: IEEE 802.11-16/1140r0 Copy from [3] Problems with 11ad Relaying (2/4) Lack of coverage extension procedures. Both Source (S-REDS) and Destination (R-DEDS) nodes must be part of the BSS/PBSS before initiating relay link setup. BSS coverage of AP/PCP 11ad relay procedure does not support STA2 joining the BSS using STA1 as relay. STA2 STA1 AP/PCP Submission Slide 14 Hiroaki Honma, KDDI R&D Labs.
September 2016 doc.: IEEE 802.11-16/1140r0 Copy from [3] Problems with 11ad Relaying (3/4) Retransmission inefficiency due to lack of scheduling flexibility of fixed First and Second Periods. Another 1st and 2nd Period pair is needed for re-transmission (S R transmission may be skipped since that was successful in first attempt) R D transmission is not successful S R PSDU 1 R D PSDU 1 S R PSDU 1 R D PSDU 1 NOTE: First and Second Periods include ACK/B-ACK transmissions also (not shown here). First Period Second Period First Period Second Period Submission Slide 15 Hiroaki Honma, KDDI R&D Labs.
September 2016 doc.: IEEE 802.11-16/1140r0 Copy from [3] Problems with 11ad Relaying (4/4) Lack of support for multi-hop relaying. Two 11ay usage models assume multi-hop relays [1]: Usage Model 4: Data Center Usage Model 8: Wireless Backhauling Another usage model could potentially benefit from (multi-hop) relays: Usage Model 7: Mobile Fronthauling Submission Slide 16 Hiroaki Honma, KDDI R&D Labs.
