Relay Enhancements For ay

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Relay Enhancements For 802.11ay Month Year doc.: IEEE 802.11-15/0xxxr0 May 2015 Relay Enhancements For 802.11ay Date: 2015-05-11 Authors: Interdigital Interdigital

May 2015 Abstract This contribution briefly reviews the key features of the relay specification in 802.11ad and proposes two areas for enhancements: Range extension Bi-directional relay capability Interdigital

May 2015 Relay Use in 802.11ad IEEE 802.11ad has support for directional relays. Relay links are seen as back-ups: utilized only when Source-Destination direct link fails. 802.11ad uses fixed 1st and 2nd Periods: channel times for Source-Relay and Relay-Destination data transfer are fixed. 802.11ad relaying procedure is unidirectional – this could be optimized to enable efficient bi-directional data transfer. Interdigital

Relay modes in 802.11ad Two types of relay operation: May 2015 Relay modes in 802.11ad Two types of relay operation: Link Switching: R is used if S-D link is disrupted. Link Cooperating: S-D frame is simultaneously repeated by R: improves signal quality at D. Two modes are supported: FD/AF: Full-duplex/amplify-and-forward HD/DF: Half-duplex/decode-and-forward Relaying steps (some differences between Link Switching and Link Cooperating relay types): Relay setup procedures (common to both types) TPA (Transmission time-Point Adjustment) procedure (only Link Cooperating) SP request and allocation (different rules for FD/AF and HD/DF modes) Data/Frame exchange rules Interdigital

Range extension for relays May 2015 Range extension for relays Two scenarios could be considered: S-REDS and D-REDS are out of direct communication and control messaging range of each other S-REDS and D-REDS are out of direct communication range, but within control messaging range of each other The range extension scenario is shown in the following figure (only data coverage ranges are shown): Interdigital

Bi-directional data transmission May 2015 Bi-directional data transmission The 802.11ad relay specification does not have a mechanism for the destination to initiate data transmission to the source using the same relay. Having this capability would enhance the efficiency and throughput and is an easy extension to the current specification. Fixed sized 1st and 2nd Periods impose some restrictions: Re-transmissions on one of the two hops requires use of a new 1st and 2nd Period pair. Transmissions in the reverse direction cannot be scheduled efficiently. A new relay channel access protocol is needed to increase efficiency for re-transmissions and bi-directional data transmission. Interdigital

Bi-directional data transmission May 2015 Bi-directional data transmission Interdigital

May 2015 Conclusions We highlighted two areas of the relay specification in 802.11ad that could be extended in 802.11ay to meet the requirements of some of the use cases under consideration. Interdigital