Comparative Study of Approximation Algorithms and Heuristics for SINR Scheduling with Power Control

A Biologically-Inspired Power Control Algorithm for Energy-Efficient Cellular Networks

“…We perform a Monte Carlo simulation 10,000 times using MATLAB. For comparison, we also consider a scheme using maximum equal power without TPC and the SINR-based TPC algorithm with several target SINR values, in which each BS controls its transmission power in order that the received SINR satisfies a given target SINR [12][13][14]. Figure 3 shows the received signal strength (RSS) in a two-dimensional plane when the maximum equal power allocation and the proposed TPC algorithm are used in a seven-cell topology.…”

“…In these schemes, a cell experiencing a heavy load or interference reduces its size by decreasing the transmission power of the BS, while neighboring cells cover those users who cannot be served by the overloaded cell, by increasing the transmission power of the BS. Furthermore, signal-to-interference plus noise ratio (SINR)-based TPC algorithms use the minimum transmit power level necessary to guarantee the required SINR at the receiving node, in an attempt to achieve not only interference mitigation, but also power savings [12][13][14]. Similarly, the transmit power is minimized based on channel state information (CSI) while maintaining a constant outage probability or bit error rate (BER) at the receiver under fading environments [15][16][17][18][19].…”

“…As reviewed above, a common strategy used by most TPC algorithms is to minimize the transmit power consumption while ensuring the required QoS (i.e., SINR, rate or BER) of each mobile station (MS) [12][13][14][15][16][17][18][19]. This strategy provides satisfactory operation in low interference environments.…”

“…Moreover, in this power minimization method, the target SINR is a key parameter that closely affects both QoS performance and energy efficiency. However, it is difficult to determine an appropriate target SINR according to the interference level, because this requires a complex calculation and a significant overhead for sharing channel information between all MSs and all BSs [12][13][14]. In addition, the conventional TPC algorithms in cellular networks mostly require a centralized controller that gathers the necessary channel information from other nodes, calculates the appropriate power level or the target SINR value and informs each node of the determined parameters [15][16][17][18][19][20][21][22][23].…”