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Uplink relaying in hybrid wireless networks with out-of-cell interference reduction

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Abstract

The next generation broadband access networks must provide high speed bidirectional data channels and support more concurrent subscribers than ever before. While mega-bits-per-second data rates have been demonstrated for the downlink channels, progress on uplink has been slow. We propose a hybrid architecture for CDMA uplink that seamlessly integrates short-range radio and WCDMA interfaces in the same network. In our scheme, mobile stations (subscribers) can operate as Relaying Mobile Terminal (RMT) to relay uplink traffic for nearby mobile stations. Our analysis and simulations show that the deployment of RMTs significantly reduces the radio transmissions in the CDMA uplink. Moreover, the scheme results in a much lower out-of-cell interference to the neighboring network cells. The problem of finding the optimum RMT set turns out to be NP-hard. Several heuristics are evaluated in terms of RMT size and out-of-cell interference. In particular, we investigated a novel vertex cover based heuristic algorithm. Our method uses mobile pilot signals and mobile location to estimate a interference function for each node. This function is then used in selecting a maximum matching for the candidate RMT set. Simulation results are somewhat surprising: the simple greedy algorithm has very close performance to that of the optimum algorithm when only the RMT size is concerned. When out-of-cell interference is considered, the proposed algorithm outperforms both greedy and 2-approximation algorithm.

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Notes

  1. Typical cell radius in a 3G network is 2 miles, which is about 30 times of the 100-m effective range for a typical WLAN.

  2. The pilot channel is transmitted in low power, and uses only a small portion of a slot time to minimize the interference.

  3. Total number of mobiles in the 120°-fan area of the cell sector.

  4. In fact, ln(|V|) is a tight upper bound.

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Authors and Affiliations

  1. Virginia Commonwealth University, Richmond, USA

    Ju Wang

  2. University of Florida, Gainesville, USA

    Jonathan C. L. Liu

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  1. Ju Wang
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  2. Jonathan C. L. Liu
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Correspondence to Ju Wang.

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Wang, J., Liu, J.C.L. Uplink relaying in hybrid wireless networks with out-of-cell interference reduction. Wireless Netw 15, 1113–1125 (2009). https://doi.org/10.1007/s11276-008-0106-5

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  • DOI: https://doi.org/10.1007/s11276-008-0106-5

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