Abstract
Device-to-device (D2D) communication is a crucial technique for various proximity services. In addition to high-rate transmission and high spectral efficiency, a minimum data rate is increasingly required in various applications, such as gaming and real-time audio/video transmission. In this paper, we consider D2D underlaid cellular networks and aim to minimize the total channel bandwidth while every user equipment (UE) needs to achieve a pre-determined target data rate. The optimization problem is jointly involved with matching a cellular UE (CU) to a D2D UE (DU), and with channel assignment and power control. The optimization problem is decoupled into two suboptimization problems to solve power control and channel assignment problems separately. For arbitrary matching of CU, DU, and channel, the minimum channel bandwidth of the shared channel is derived based on signal-to-interference-plus-noise ratio (SINR)-based power control. The channel assignment is a three-dimensional (3-D) integer programming problem (IPP) with a triple (CU, DU, channel). We apply Lagrangian relaxation, and then decompose the 3-D IPP into two two-dimensional (2-D) linear programming problems (LPPs). From intensive numerical results, the proposed resource allocation scheme outperforms the random selection and greedy schemes in terms of average channel bandwidth. We investigate the impact of various parameters, such as maximum D2D distance and the number of channels.
Highlights
The fifth-generation (5G) network is expected to create new services in diverse industries [1].One of the newly enabled services in 5G is proximity service in the vehicle-to-everything (V2X) network, the public safety network, and the social network, etc
In [9], multiple D2D UE (DU) can be matched to a single cellular UE (CU) and an optimal energy-efficient power control scheme was proposed while guaranteeing the minimum required data rate of each user equipment (UE)
Given the channel bandwidth for CU i (CUi), bci,j [n], channel 1, the match-up of CU and DU is the best one from among M possible matches, and signal-to-interference-plus-noise ratio (SINR) at the base station (BS) can be expressed as the corresponding box linked to DU is painted with the darkest green color
Summary
The fifth-generation (5G) network is expected to create new services in diverse industries [1]. In [9], multiple DUs can be matched to a single CU and an optimal energy-efficient power control scheme was proposed while guaranteeing the minimum required data rate of each user equipment (UE). When the received SINR is low due to high interference and maximum transmit power limitation, the fixed channel bandwidth may not be wide enough to guarantee the target rate. The remaining problem is a 3-D assignment problem to minimize the overall channel bandwidth, while guaranteeing the target data rate; Since the channel is shared, increasing the transmit power of CU may cause severe interference to DU and vice versa. Even though SINR or minimum data rate per UE is considered as a constraint, some UEs may not meet the constraint, i.e., the feasible set becomes empty due to maximum transmit power limitation and fixed channel bandwidth. The channel bandwidth can be adaptively determined according to the received SINR to meet the minimum data rate
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