Abstract
Abstract This paper aims at improving the system throughput of orthogonal frequency division multiple access small cell networks. Different with traditional schemes that neglect the cooperation among small cells, a scheme named as resource block exclusion-based power control (RBEBPC) is proposed by sharing the interference correlated information. RBEBPC consists of two steps that are iteratively conducted. First, based on current power allocation results, partial system resource blocks are excluded by playing the formulated cooperative coalition formation games. Second, the transmission power of each small cell is determined by solving a modified throughput maximization problem after the resource block exclusion. As the generated interference is constrained in the second step, part of the small cells transmit without full power. Thereby, the overall system interference keeps non-increasing after RBEBPC is adopted. Simulation results indicate that about 15% system throughput gain and 13% power saving gain are obtained compared to traditional iterative water filling scheme.
Highlights
The wireless data traffic of cellular system is soaring
This paper focuses on the system throughput improvement via cooperative power control in orthogonal frequency division multiple access (OFDMA) small cell networks
Based on the system resource structure, a cooperative power control scheme named as resource block exclusion-based power control (RBEBPC) is proposed
Summary
The wireless data traffic of cellular system is soaring. Based on the report of future mobile data forecast by Cisco, the compound annual growth rate of mobile data traffic from 2011 to 2016 will be 78% [1]. Small cell is the node whose transmission power is lower than that of the macro base station [3] Both picocell and femtocell are included in the concept of small cell. In addition to orthogonal resource reuse, power control is considered to mitigate the interference. Authors of [11] provide a price-based power control scheme to manage the first category of interference. Authors of [15] provide a binary power allocation scheme to mitigate the second category of interference but the research is limited to indoor scenario. Based on the resource structure of OFDMA small cell networks, the proposed scheme, which is called resource block exclusion based power control (RBEBPC), conducts the following two steps iteratively. In the frequency dimension, each sub-channel can be occupied by at most N small cells and these small cells cannot share the transmission power. The wireless channel is assumed to vary in a slower pace compared to our power control scheme, i.e., the channel
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