Abstract
Device-to-device (D2D) multicast communication can greatly improve the spectrum utilization in a content delivery scenario. However, the co-channel interference and power consumption brought by D2D bring new challenges. All the D2D multicast groups expect to achieve a higher system capacity with less extra energy cost. In this paper, we investigate the uplink resource allocation issue when D2D multicast groups share the resources with other cellular uses (CUs), while guaranteeing a certain level of quality of service (QoS) to CUs and D2D users. Firstly we address a flexible tradeoff framework in which the system power consumption and the system capacity (i.e., the number of admitted D2D links) are assigned with different weight factors so that these two objectives are jointly considered. Then we propose an efficient resource optimization scheme, which comprises sub-channel allocation and signal-to-interference- plus-noise ratio (SINR) assignment. Numerical results validate the effectiveness of the proposed framework, and demonstrate the advantages in dealing with the proposed multi-objective optimization problem.
Highlights
In recent years, the popularity of mobile multimedia services has led to an explosive growth of mobile data traffic
Underlay D2D communication can improve the spectrum efficiency by allocating the same resources to D2D users and cellular users (CUs), co-channel interference is introduced in this case, and careful resource allocation is required for coexistence of CUs and D2D users
The framework allows network operators to adjust the tradeoff between the two objectives with various preferences; (2) We use the way of one D2D group sharing sub-channels with multiple CUs to allocate cellular resources, which further enhances the performance of our optimization; (3) We develop an efficient resource allocation scheme to achieve the desired tradeoff for given preferences
Summary
The popularity of mobile multimedia services has led to an explosive growth of mobile data traffic. To meet various requirements for local wireless services, such as mobile TV, teleconferencing, multiplayer games, the Third Generation Partnership Project (3GPP) is focusing on Device-to-Device (D2D) communication as a goal in Long Term Evolution-Advanced (LTE-A) [1]. With the support of evolved node base stations (eNBs) in a cellular network, D2D communication provides direct data transmission among user equipments (UEs). As a promising technique of future cellular network, D2D communication is being intensively mined for its potentials of wireless application by worldwide researchers. Underlay D2D communication can improve the spectrum efficiency by allocating the same resources to D2D users and cellular users (CUs), co-channel interference is introduced in this case, and careful resource allocation is required for coexistence of CUs and D2D users.
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