Abstract
Topological interference management (TIM) is considered under the condition that only topology-related information is available at the transmitters, but no accurate channel state information is fed back to them, which is capable of significantly reducing the overhead imposed on the network. TIM schemes can be classified into two broad categories, relying either on a fixed topology or on alternating connectivity. In this paper, we review the family of TIM schemes. Specifically, for the fixed topology, we discuss the attainable degrees of freedom (DoFs) under the condition that the channel coefficient values are either constant or time varying. For constant channel coefficients, we discuss the multiple groupcast networks/multiple unicast networks, interference channel networks, and interference broadcast channel networks; while for time-varying channel coefficients, we discuss interference channel networks and interference broadcast channel networks. Furthermore, in the context of alternating connectivity, we discuss the attainable DoF for interference channel networks, as well as X networks, vector broadcast channel networks, and interference broadcast channel networks. Finally, promising research directions are identified for TIM schemes.
Highlights
In support of the increasing demand for high-speed communication, the heterogeneous network (HetNet) concept was conceived for improving the spectral efficiency [1], which is achieved by relying both on micro cells and femto cells
Sun and Jafar [9] quantified the optimal symmetric degrees of freedom (DoF) based on topological interference management (TIM) schemes designed for a scenario described as a 4-to-1 1 × 2 single input multiple output (SIMO) interference channel (IC) network, where the above-mentioned compact representation implies that four pairs of users are supported and each transmitter has one antenna, while each receiver has two antennas
Receiver one is interfered by all the other three transmitters, while the remaining receivers only receive the desired signals. Both the upper bound of the symmetric DoF of (1 × R) SIMO IC networks, as well as the DoF regions of multiple input single output (MISO) IC networks managed by TIM schemes were quantified
Summary
In support of the increasing demand for high-speed communication, the heterogeneous network (HetNet) concept was conceived for improving the spectral efficiency [1], which is achieved by relying both on micro cells and femto cells. Sun and Jafar [9] quantified the optimal symmetric DoF based on TIM schemes designed for a scenario described as a 4-to-1 1 × 2 single input multiple output (SIMO) interference channel (IC) network, where the above-mentioned compact representation implies that four pairs of users are supported and each transmitter has one antenna, while each receiver has two antennas. Receiver one is interfered by all the other three transmitters, while the remaining receivers only receive the desired signals Both the upper bound of the symmetric DoF of (1 × R) SIMO IC networks, as well as the DoF regions of multiple input single output (MISO) IC networks managed by TIM schemes were quantified. Aquilina and Ratnarajah [18] considered a 2-cell 2-user-per-cell interference broadcast channel, where the associated TIM schemes were characterized by quantifying the DoF bounds in the context of SISO, MISO and MIMO configurations. Notations: Aij represents the element of the ith row and the jth column of the matrix A
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