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

2. June 2010
doc.: IEEE /xxxxr0
Abstract
Several presentations [1], [2], [3] have proposed to create a new Study Group to enhance the system capacity of 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

3. June 2010
doc.: IEEE /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

4. Existing WLAN direct Solutions
June 2010
doc.: IEEE /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

5. Proposed Multi-level Hybrid Network
June 2010
doc.: IEEE /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

6. Improvement and key technologies
June 2010
doc.: IEEE /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

7. D2D Communication Enhancements
June 2010
doc.: IEEE /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

8. D2D Communication Enhancements
June 2010
doc.: IEEE /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

9. June 2010
doc.: IEEE /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

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