Abstract
In device-to-device (D2D)-enabled communications, a channel can be matched to a cellular user (CU)–D2D user (DU) pair, where either two separate resources can be allocated in a dedicated mode, or a single resource is shared in a shared mode. It affects the channel capacity and the channel bandwidth needed to guarantee the target data rate. The transmit power also needs to be adaptively controlled according to channel bandwidth, as well as channel quality. In this paper, we propose a resource allocation scheme to minimize the total channel bandwidth while guaranteeing the target data rate of guaranteed bit rate services. The original problem is separated into two sub-problems; (1) the channel bandwidth calculation and channel sharing mode selection for arbitrary matching (2) the 3-D matching problem of the CU, DU and channel. To mitigate computational complexity, the 3-D matching problem is transformed into two 2-D matching problems, and a sub-optimal solution is derived using a sub-gradient algorithm. From numerical results, it was confirmed that the average channel bandwidth was almost the same even though the computational complexity of the sub-optimal algorithm was very low compared to the original algorithm. We also investigate the impact of various parameters, such as maximum D2D distance and the number of users.
Highlights
In device-to-device (D2D) communications, devices in the same vicinity can communicate directly with each other without routing the data path through a network infrastructure, e.g., the Uu-interface in the 3rd Generation Partnership Project (3GPP)
Energy-efficient D2D based communication has been studied for the smart grid and Internet of Things (IoT), and to meet the transmission delay requirements needed for real-time
To the best of our knowledge, there is no previous research on resource allocation for Guaranteed bit rate (GBR) services in D2D-enabled communications which jointly solves the transmit power control, cellular user (CU)-D2D user (DU)-channel matching, sharing mode selection, and channel bandwidth
Summary
In device-to-device (D2D) communications, devices in the same vicinity can communicate directly with each other without routing the data path through a network infrastructure, e.g., the Uu-interface in the 3rd Generation Partnership Project (3GPP). Since most of these works allocate a single channel of a fixed bandwidth to one CU, there is still a problem in that some users have a SINR or a data rate below their QoS requirements. To the best of our knowledge, there is no previous research on resource allocation for GBR services in D2D-enabled communications which jointly solves the transmit power control, CU-DU-channel matching, sharing mode selection, and channel bandwidth. CUs, is DUs matchings, and channels without shared beneficial than the dedicated without multiple assignments. The channels matching combination represents a collection of all the DUs matchings, and bandwidth becomes , ( ) for a matching of CU 1 and DU 1 In this this study, we resource allocation allocation method channels without multiple assignments. L)is the remaining togetherchannel with thebandwidth channel requiring a smaller bandwidth
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