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Multiuser Scheduling in the 3GPP LTE Cellular Uplink
Jan. 2014 (vol. 13 no. 1)
pp. 130-145
Narayan Prasad, NEC Labs America, Princeton
Honghai Zhang, NEC Labs America, Princeton
Hao Zhu, University of Minnesota, Minneapolis
Sampath Rangarajan, NEC Labs America, Princeton
In this paper, we consider resource allocation in the 3GPP Long Term Evolution (LTE) cellular uplink (UL), which will be the most widely deployed next generation cellular uplink. The key features of the 3GPP LTE uplink are that it is based on a modified form of the orthogonal frequency division multiplexing-based multiple access (OFDMA), which enables channel dependent frequency selective scheduling, and that it allows for multiuser (MU) scheduling wherein multiple users can be assigned the same time-frequency resource. In addition to the considerable spectral efficiency improvements that are possible by exploiting these two features, the LTE UL allows for transmit antenna selection together with the possibility to employ advanced receivers at the base-station, which promise further gains. However, several practical constraints that seek to maintain a low signaling overhead are also imposed. In this paper, we show that the resulting resource allocation problem is APX-hard and then propose a local ratio test (LRT)-based constant-factor polynomial-time approximation algorithm. We then propose two enhancements to this algorithm as well as a sequential LRT-based MU scheduling algorithm that offers a constant-factor approximation and is another useful choice in the complexity versus performance tradeoff. Further, user preselection, wherein a smaller pool of good users is preselected and a sophisticated scheduling algorithm is then employed on the selected pool, is also examined. We suggest several such user preselection algorithms, some of which are shown to offer constant-factor approximations to the preselection problem. Detailed evaluations reveal that the proposed algorithms and their enhancements offer significant gains.
Index Terms:
resource allocation,submodular maximization,Local ratio test,DFT-spread-OFDMA uplink,multiuser scheduling,NP-hard
Citation:
Narayan Prasad, Honghai Zhang, Hao Zhu, Sampath Rangarajan, "Multiuser Scheduling in the 3GPP LTE Cellular Uplink," IEEE Transactions on Mobile Computing, vol. 13, no. 1, pp. 130-145, Jan. 2014, doi:10.1109/TMC.2012.230
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