Abstract
The Electronic Communication Committee (ECC) in Europe proposed a location‐based transmission power allocation rule for secondary devices operating in the TV white space (TVWS). The further the secondary device is located from the TV cell border the higher transmission power level it can utilize. The Federal Communication Committee (FCC) in the US proposed a fixed transmission power allocation rule for all secondary transmitters. Both rules do not consider the secondary system’s self‐interference while setting the transmission power levels. In this paper, we propose a power allocation scheme for a cellular secondary system. Unlike the ECC and the FCC proposals we do the power allocation by considering the self‐interference. We define the power allocation scheme as an optimization problem. The sum cell border data rate of the secondary network is selected to be the optimization objective. We observe that the optimal transmission power levels become approximately constant over the secondary deployment area. The FCC rule captures the general trend for cellular deployment in the TVWS, since it suggests the use of constant power. However, the transmission power should not be set equal to 4 W but according to the allowable generated interference at the borders of the TV and secondary cells.
Highlights
Cellular networks have transitioned from providing mobile telephony with limited data to supporting diverse types of applications with high capacity requirements
The interference margin can be treated as an available resource and the problem of allocating the transmission power to the cellular network can be viewed as a resource-sharing problem
In this paper we proposed a method to set the transmission power level in a cellular network operating in the TV white space (TVWS) without violating the protection criteria of TV receivers
Summary
Cellular networks have transitioned from providing mobile telephony with limited data to supporting diverse types of applications with high capacity requirements. Given the same transmission power level and the different distances to the TV cell border, the secondary users take unequal shares of the available interference margin. Most of the proposed algorithms make one of the following assumptions: (i) the generated interference is modelled only through its mean value and channel uncertainties due to the fading are not considered [6, 7]; (ii) the generated interference is controlled only at a single point and not along the TV coverage cell border [7,8,9]; (iii) the transmission power allocation in the secondary devices is uniform [8,9,10]. We propose a scheme for setting the transmission power level in a cellular secondary network without violating the protection criteria of the TV receivers. The transmission power level should not be arbitrarily set equal to 4 W but according to the interference margin available at the borders of the TV and secondary cells.
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