User Cooperation Enabled Traffic Offloading in Urban Hotspots


Tim Rüegg, Yahia Hassan, and Armin Wittneben


IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC), Valencia, Spain, Sept. 2016.

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In this paper, we propose to serve the mobile stations in an urban traffic hotspot by combining user cooperation with traffic offloading to the vast amount of residential WLAN access points. Different to existing virtual MIMO approaches, we include local users, which are assigned to the access points and compete for the physical resources. Furthermore, all signal processing shall be done on the mobile station side. This makes the protocol fully transparent for the access points and allows it to be overlaid on the existing infrastructure and protocols. We thereby discuss the necessary coordination with the local users and suggest a hybrid protocol implementation with distributed spatial multiplexing for the WLAN access at 2.4 GHz and a local exchange with message flooding at 60 GHz, all with single omnidirectional antennas. Using a numerical simulation framework with realistic parameters and channel models, the protocol is thoroughly evaluated, considering multiple clusters and spatial reuse. It is thereby shown that the 60 GHz exchange is very efficient even with omnidirectional antennas. For a moderate cluster size of 16 nodes per cluster, a 10 fold increase in the sum rate is achieved. By scaling the bandwidth for the user cooperation this gain can be further scaled.

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