Multiple Access Integrated Adaptive Finite Blocklength for Ultra-Low Delay in 6G Wireless Networks
IEEE Trans. Wirel. Commun.(2024)
摘要
Facing the dramatic increase of real-time applications and time-sensitive
services, large-scale ultra-low delay requirements are put forward for the
sixth generation (6G) wireless networks. To support massive ultra-reliable and
low-latency communications (mURLLC), in this paper we propose an adaptive
finite blocklength framework to reduce the over-the-air delay for short packet
transmissions with multiple-access and delay-bounded demands. In particular, we
first give the specified over-the-air delay model. Then, we reveal the tradeoff
relationship among queuing delay, transmission delay, and the number of
retransmissions along with the change of finite blocklength, as well as
formulate the adaptive blocklength framework. Based on the adaptive blocklength
framework and associated with grant-free (GF) access protocol, we formulate the
average over-the-air delay minimization problem, where the blocklength can be
adaptively changed in terms of transmission time interval (TTI) design and
bandwidth allocation to achieve the optimal tradeoff and obtain its minimum
over-the-air delay. We develop the cooperative multi-agent deep Q-network
(M-DQN) scheme with a grouping mechanism to efficiently solve the average
over-the-air delay minimization problem. Numerical results validate our
proposed adaptive blocklength scheme outperforms corresponding schemes in
long-term evolution (LTE) and the fifth generation (5G) new radio (NR).
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关键词
Massive ultra-reliable and low-latency communications (mURLLC),delay tradeoff,adaptive finite blocklength,grant-free access,over-the-air delay minimization
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