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| The conventional uplink transmission method suffers from high latency which is not enough to guarantee the requirement of latency sensitive applications, such as Voice over Internet Protocol (VoIP) and real time gaming. In order to decrease the delay, in the Long Term Evolution Advanced (LTE-A) system, contention-based (CB) uplink transmission solution is proposed. This method allocates a contention-based Grant (CB Grant) to a group of uplink synchronized users (i.e., a CB user group). However, collision probability increases with the load due to the same uplink resources shared by several users. In this paper, we proposed a coordination-based uplink transmission method to avoid collisions. The eNB configures the coordination resource to a group of users which can listen to each other by using Device-to-Device (D2D) communication, and one shared Physical Uplink Shared Channel (PUSCH) resources. When a user equipment (UE) has data to transmit, it will send a request and listen on the coordination resource, then UE sending on the coordination resource with the highest priority can transmit uplink data on the shared PUSCH resource. The simulation results demonstrate that our proposed method can improve resource utilization and reduce latency. |
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| Keywords:coordination-based; uplink transmission; D2D; LTE-A |
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