DCI-Free Based Downlink Prescheduling Scheme for Ultra-Reliable and Low Latency Communications

The fifth generation (5G) cellular network are divided into three key usage scenarios as enhanced mobile broadband, massive machine-type communications and ultra-reliable and low-latency communications (URLLC). To insure the low end-to-end delay and high reliability for users in URLLC, the overhead of physical downlink control channel (PDCCH) resource needs to be greatly increased during the scheduling process. In this paper, a downlink prescheduling scheme is proposed, where we don't need to transmit downlink control information (DCI). With this DCI-Free scheme, we can not only save PDCCH resource to support more users, but also simplify the signaling interaction to reduce the time delay. Simulation results show that the proposed scheme is able to support more users and decrease transmission delay without downlink control information in URLLC.

[1]  Juan Montojo,et al.  Link-Level Analysis of Low Latency Operation in LTE Networks , 2016, 2016 IEEE Global Communications Conference (GLOBECOM).

[2]  Saloua Hendaoui,et al.  Downlink scheduling for real time application over LTE-A network: Delay aware scheduling , 2015, 2015 5th International Conference on Communications and Networking (COMNET).

[3]  Lei Zhou,et al.  An improving strategy for LTE downlink scheduling algorithms based on QoS requirement , 2015, 2015 IEEE International Workshop Technical Committee on Communications Quality and Reliability (CQR).

[4]  Preben E. Mogensen,et al.  Pre-Scheduled Resources for Retransmissions in Ultra-Reliable and Low Latency Communications , 2017, 2017 IEEE Wireless Communications and Networking Conference (WCNC).

[5]  Sinem Coleri Ergen,et al.  Towards ultra-reliable M2M communication: Scheduling policies in fading channels , 2016, 2016 23rd International Conference on Telecommunications (ICT).

[6]  Hoon Kim,et al.  A proportional fair scheduling for multicarrier transmission systems , 2004 .

[7]  Pekka Pirinen,et al.  A brief overview of 5G research activities , 2014, 1st International Conference on 5G for Ubiquitous Connectivity.