Statistical Delay and Error-Rate Bounded QoS Provisioning for mURLLC Over 6G CF M-MIMO Mobile Networks in the Finite Blocklength Regime

Xi Zhang, Jingqing Wang, H. Vincent Poor

Research output: Contribution to journalArticle

Abstract

In supporting the new 6G standard traffic services – massive ultra-reliable low-latency communications (mURLLC), several advanced techniques, including statistical delay-bounded quality-of-service (QoS) provisioning theory and finite blocklength coding (FBC), have been developed to upper-bound both delay and error-rate for time-sensitive multimedia applications. On the other hand, cell-free (CF) massive multi-input multi-output (m-MIMO), where a large number of distributed access points (APs) jointly serve a massive number of mobile devices using the same time-frequency resources, has emerged as one of the 6G key promising techniques to significantly improve various QoS performances for supporting mURLLC. However, due to the complexity in modeling stochastic queueing behaviors of CF m-MIMO schemes, it is challenging to statistically guarantee stringent mURLLC requirements for transmitting bandwidth-intensive and delay-sensitive multimedia traffics over highly time-varying wireless channels in the finite blocklength regime. To overcome the above problems, we develop analytical modeling schemes to precisely characterize the delay and error-rate bounded QoS performances considering non-vanishing decode error probability for CF m-MIMO based schemes. In particular, we develop FBC based system models and apply the Mellin transform to characterize arrival/service processes for our proposed CF m-MIMO modeling schemes. Then, we formulate and solve the delay violation probability minimization problem and obtain the closed-form solution of the optimal rate adaptation policy for each mobile user, which plays the important roles in system design and performance analyses for statistical delay and error-rate bounded QoS provisioning over 6G CF m-MIMO mobile wireless networks. Our simulation results validate and evaluate our proposed schemes under statistical delay and error-rate bounded QoS constraints.

Original languageEnglish (US)
JournalIEEE Journal on Selected Areas in Communications
DOIs
StateAccepted/In press - 2020

All Science Journal Classification (ASJC) codes

  • Computer Networks and Communications
  • Electrical and Electronic Engineering

Keywords

  • 6G mURLLC
  • CF massive MIMO
  • Delays
  • Fading channels
  • FBC
  • massive short-packet access
  • Mellin transform
  • Probability
  • Quality of service
  • Rician channels
  • SNC
  • Statistical delay and error-rate bounded QoS provisioning
  • Wireless communication

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