D2D Technology for HEW Date: 2013-05-12 Authors: January 2010 doc.: IEEE 802.11-10/0084r3 D2D Technology for HEW Date: 2013-05-12 Authors: Brian Hart, Cisco Systems

June 2010 doc.: IEEE 802.11-10/xxxxr0 Abstract Several presentations [1], [2], [3] have proposed to create a new Study Group to enhance the system capacity of 802.11 by introducing some new PHY & MAC features. This presentation discusses the D2D features for HEW. With the characteristics of short-range communication, D2D has great advantages in saving wireless resources, reducing the system interference and providing more flexible services. Expand network coverage Increase wireless resource efficiency and system capacity Better adapted to the requirements of the local data services Brian Hart, Cisco Systems

June 2010 doc.: IEEE 802.11-10/xxxxr0 Background [1] proposed “High-efficiency Wi-Fi” to drive the next generation WLAN. WLAN also need to be upgraded to support increasing demands of data communications and emerging applications together with the cellular systems. [2] Device-to-Device (D2D) ： The adjacent STAs in close range can transmit data via direct link, It can achieve higher data rate, low latency, and low power consumption via close direct communication method. It can effectively use spectrum resources. It can adapt to the demand of local data sharing and flexible data services It can take advantage of a large number of widely distributed terminals to expand network coverage. Brian Hart, Cisco Systems

Existing WLAN direct Solutions June 2010 doc.: IEEE 802.11-10/xxxxr0 Existing WLAN direct Solutions DLS (direct link setup): enables a STA to transmit frames directly to another STA in the same infrastructure network. TDLS (tunneled direct-link setup): uses TDLS frames through an AP to establish direct link between two non-AP STAs. The limitations of the existing solutions: Limited to the same infrastructure network Support only single-hop P2P Limited flexibility Lower efficiency Smaller coverage Brian Hart, Cisco Systems

Proposed Multi-level Hybrid Network June 2010 doc.: IEEE 802.11-10/xxxxr0 Proposed Multi-level Hybrid Network D2D links can be controlled by AP or STAs autonomously. Direct links can be established between STAs in different BSS. Support multi-hop direct links. Support two-way / multiple-way Relay network structure Brian Hart, Cisco Systems

Improvement and key technologies June 2010 doc.: IEEE 802.11-10/xxxxr0 Improvement and key technologies Improvement : Interference control and coordination Lower power consumption Larger coverage Higher throughput Possible enhancement technologies for D2D : Relay Efficient MIMO and coded modulation (CM) HARQ and Adaptive Modulation and Coding (AMC) Network Coding (NC) Multimedia Broadcast and Multicast Service (MBMS) Brian Hart, Cisco Systems

D2D Communication Enhancements June 2010 doc.: IEEE 802.11-10/xxxxr0 D2D Communication Enhancements D2D link with relay Two-way / multiple-way relay Multiple access relay channel (MARC) Single-hop and multiple-hop relay larger coverage Efficient MIMO and Coding modulation More antennas Higher MCSs (higher code rate, 512,1024QAM) Joint coding and modulation diversity HARQ and AMC Improve robustness Adaptive to the channel condition Brian Hart, Cisco Systems

D2D Communication Enhancements June 2010 doc.: IEEE 802.11-10/xxxxr0 D2D Communication Enhancements Network coding Multiple-way Relay PNC MARC PNC Higher efficiency Higher throughput Multimedia Broadcast and Multicast Service (MBMS) Enhance network service QoS Ease the bandwidth pressure Brian Hart, Cisco Systems

June 2010 doc.: IEEE 802.11-10/xxxxr0 Conclusions With the development of wireless multimedia services, growing requirements of local data sharing services put forward higher demands to the WLAN Introduce D2D technology in the WLAN to form a multi-level hybrid network that WLAN and D2D communication can coexist. Higher throughput Higher Coverage More flexible Services Brian Hart, Cisco Systems

References [1] 11-13-0331-03-0wng-high-efficiency-wlan.ppt [2] 11-13-0287-03-0wng-beyond-802-11ac-a-very-high-capacity- wlan.pptx [3] 11-13-0309-00-0wng-next-gen-wlan.pptx [4] 11-13-0314-00-0wng-on-future-enhancements-to-802-11- technology.pptx [5] 11-13-0313-00-0wng-usage-models-for-next-generation-wi-fi.pptx