Abstract
Ultra Reliable and Low Latency Communications (URLLC) play a key role in 5G vertical markets, but pose many technical challenges especially when sharing the spectrum with Enhanced Mobile Broadband (eMBB) customers. This study aims to overcome the spectrum inefficiency issue of fully separate (FS) approach and the contention issue of the fully overlap (FO) approach. We present a user-initiated probability elastic resource (UPER) approach by dynamically adjusting the probability of using the shared spectrum for eMBB and URLLC traffic based on the current success and failure status of packet transmission status. The probabilities of successful transmission are derived for UPER, FS, and FO and partially overlap (PO) sharing spectrum approaches. We find that the successful transmission probability of UPER approach is 28% and 46% higher than FS and FO approaches, respectively. We further evaluate the reliability and throughput performance of URLLC and eMBB. When the URLLC packet load is low, the UPER method can almost achieve the best performance of the FS method. When the URLLC packet load is high, we show that UPER can improve the reliability performance up to 54% compared with other methods.
Highlights
U LTRA-RELIABLE and low latency communications (URLLC) of the fifth generation (5G) wireless communications aim for providing time-critical machine-to-machine or human-to-machine vertical applications, such as factory automation, vehicular communications, and augmented reality, etc., [1]–[4]
Because 5G Enhanced Mobile Broadband (eMBB) services are more popular than mMTC services, we focus on the multiplexing issue of URLLC and eMBB packets [10]–[12]
We show the average reliability and throughput performance of URLLC users and eMBB users for various spectrum allocation methods
Summary
U LTRA-RELIABLE and low latency communications (URLLC) of the fifth generation (5G) wireless communications aim for providing time-critical machine-to-machine or human-to-machine vertical applications, such as factory automation, vehicular communications, and augmented reality, etc., [1]–[4]. This study develops a dynamic spectrum allocation method that can reduce the packet collisions of multiplexing URLLC and eMBB packets based on grant-free MAC protocol in order to maintain low latency and high reliability for URLLC customers. Derive the closed-form expressions for the successful transmission probability in terms of the number of URLLC and eMBB packets based on grant-free MAC protocol under four different spectrum allocation methods, including fully separate (FS), fully overlap (FO), partially overlap (PO) and UPER. Such analytical models can help verify the feasibility of UPER and provide quantitative performance comparison with other considered spectrum allocation methods.
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