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Resource Allocation Scheme for Multihop Cellular Networks Using Directional Transmission

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Abstract

Multihop cellular networks offer a cost-effective solution to the problem of achieving higher capacity and extending coverage by using relay stations (RSs) deployed within the coverage area of a base station (BS). We herein consider directional transmission based on adaptive beamforming in which multiple users are served at the same time using multiple directional beams; this represents one promising technology that could improve the capacity of multihop cellular network. In directional transmission, severe intra-BS/RS, inter-BS–RS, and inter-RS interferences can occur due to the concurrent transmission and accordingly, system performance can be degraded severely. In this paper, we propose resource allocation to maximize the system capacity of multihop cellular networks by taking into account these severe interferences caused in multihop cellular network using directional transmission. To alleviate the problem of high computational complexity, we propose a sub-optimal scheme. A heuristic scheme is also proposed which can be performed in distributed manner with lower computational complexity. Through simulation results, we show that the use of our proposed schemes increases system capacity.

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Notes

  1. The directional transmission considered in this paper is different from the transmission in MU-MIMO in the sense that the transmit power is concentrated to the direction where the receiver is located [3, 4, 18–21].

  2. The terms “directional transmission” and “beam” are used interchangeably in this paper. The term “beam” is used because the transmit power is concentrated to one direction.

  3. As a result of using direction-of-arrival (DOA) algorithms [24], it is assumed that the BS and RSs could know the location of users, so that they could form directional beams towards them accurately.

  4. The BS and RS can obtain the channel state information of their own users by receiving feedback from the users [25].

  5. The frame preamble indicates the start of each frame, for purposes of frame synchronization.

  6. In this case, the interference is caused because users which belong the same BS/RS can be served at the same time by using the same frequency and the directional transmission is imperfect, i.e., portion of transmitted power can be leaked to unwanted users.

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Acknowledgments

This work was supported by Basic Science Research Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Education (NRF-2015R1D1A1A01057529).

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Authors and Affiliations

  1. Korea Telecom, Seoul, Republic of Korea

    Sung-Yeop Pyun

  2. Gyeongsang National University, Tongyoung, Republic of Korea

    Woongsup Lee

  3. Ubiquitous Mobile Life Systems Lab, EECS, KAIST, Daejeon, Republic of Korea

    Dong-Ho Cho

Authors
  1. Sung-Yeop Pyun
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  2. Woongsup Lee
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  3. Dong-Ho Cho
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Correspondence to Woongsup Lee.

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Pyun, SY., Lee, W. & Cho, DH. Resource Allocation Scheme for Multihop Cellular Networks Using Directional Transmission. Wireless Pers Commun 94, 3355–3369 (2017). https://doi.org/10.1007/s11277-016-3780-0

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