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Abstract

Short-range low-power 6th generation (6G) in-X subnetworks are proposed as a viable radio concept for supporting extreme communication requirements in emerging applications such as wireless control of robotic arms and control of critical on-body devices, e.g. wireless heart pacemaker. For these applications, ultra-high reliability (e.g., above 6 nines) with sub-ms latency must be guaranteed at all spatio-temporal instants. To meet these requirements, radio systems that are robust against fading and interference are crucial. In this paper, we present a comprehensive investigation on technology enablers and techniques for interference mitigation in 6G in-X subnetworks. We present several techniques including blind-repetition with pseudo-random frequency hopping and environment-aware mechanisms for interference management via dynamic channel allocation. We further propose two novel enhancements viz: (1) repetition order adaptation involving real-time selection of the number of repetitions based on current channel conditions; and (2) anticipatory packet duplication in which each subnetwork duplicates its transmission on a secondary channel group whenever it detects the presence of a potentially harmful neighbouring subnetwork. We perform extensive simulations in an industrial factory environment with mobile in-X subnetworks using models and parameters defined by the 3rd Generation Partnership Project (3GPP). Results show that in-X subnetworks requires large bandwidth (≥ 1 GHz), up to 2 packet repetitions and environment-aware interference coordination in order to support packet loss rate below 10-6 with a latency < 100μs. The number of repetitions can however be reduced for systems with survival time greater than the cycle time. The proposed enhancements also result in up to × 104 packet loss rate reduction for systems with survival time above 2 cycle times.

Original languageEnglish
JournalIEEE Access
Volume10
Pages (from-to)45784-45798
Number of pages15
ISSN2169-3536
DOIs
Publication statusPublished - 26 Apr 2022

Keywords

  • 6G
  • in-X subnetworks
  • interference management
  • Resource Allocation
  • Industry 4.0
  • MAC
  • Fading channels
  • Interference
  • Production facilities
  • 6G mobile communication
  • Wireless communication
  • Wireless sensor networks
  • resource allocation
  • survival time
  • packet duplication
  • ultra-reliable low latency communication (URLLC)
  • industrial control
  • Reliability
  • interference mitigation
  • link adaptation

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