A Utility-Based Joint Resource Allocation Approach for Multi-Service in CoMP Networks

Abstract

Coordinated multi-point (CoMP) joint transmission is considered as a key technique to mitigate inter-cell interference and improve the cell-edge performance in 3GPP LTE-Advanced. In this paper, a utility-based joint resource allocation approach is proposed to support CoMP joint transmission in orthogonal frequency division multiple access systems. Two different utility functions are considered with diverse quality of service provisioning. The objective is to maximize the sum utility of a clustered CoMP network, considering mixed real-time voice over IP (VoIP) and best-effort (BE) traffic patterns. A centralized joint resource allocation algorithm is proposed by decoupling the optimization problem into per-subchannel subproblems. Further more, a greedy user selection based low-complexity algorithm is proposed for practical implementation. For the sake of performance comparison, the proportional-fair based joint scheduling, as well as two non-coordinated scheduling schemes are also evaluated. Via system-level simulation we show that the proposed algorithms not only substantially improve the cell-edge spectrum efficiency of BE users, but also significantly decrease the packet drop ratio and call outage ratio of VoIP users.

QoS provision inter-cell Interference Coordination approach based on joint transmission and Superposition Coding

“…A number of BE and VoIP users are uniformly generated in the cell-edge and cell center areas of each cell. The VoIP traffic generates a 40-byte VoIP packet every 10 ms. To meet the QoS requirement, the maximum queuing delay is set to 20 ms [5]. The BE data packet is 1500-bytes.…”

“…Thus, a robust optimization of the limited radio resources is needed. In [5], authors propose a utility-based joint resource allocation approach to maximize the cluster sum utility, considering mixed BE and Voice Over IP (VoIP) traffics. The strategy is based on JT technique.…”