Abstract
The closed-loop latency quality of service (QoS) provisioning for tactile services is a pending problem. Based on martingale theory, this paper studies the bandwidth abstraction and service rate instantiation under closed-loop latency constraint for the tactile slice. The demanded bandwidth for arrivals is abstracted by considering the complex features of arrival traffic. The uplink delay is mapped into the analysis of downlink queuing system, which enables the closed-loop latency analysis. A martingale analytical framework is proposed so that the precise delay performance for downlink with bursty arrivals can be evaluated. We construct a Backlog Martingale process for the buffer backlog. A stopping time event that considers uplink and downlink jointly is defined under the closed-loop latency QoS constraint. Leveraging stopping time theory, a tight bound of delay violation probability is derived to guide the bandwidth abstraction. Service rates are instantiated by activating RRHs to form a dynamic MIMO system. Simulation results verify the effectiveness of the proposed strategy.
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