Skew Estimation Based on Weighted Median for Average Consensus Time Synchronization in the Presence of Communication Delays

Wang, Heng; Chen, Liuqing; Gong, Pengfei; Li, Min

doi:10.1109/lwc.2020.2991186

Cited by 8 publications

(2 citation statements)

References 14 publications

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“…For distributed time synchronization methods, the average time synchronization (ATS) theory is generally used to realize time synchronization between both communication sides (Schennato & Fiorentin, 2011) because there is no repeater to transmit reference time. Wang, Chen, Gong, and Li (2020) used the ATS time synchronization method to compensate for the clock offset estimate obtained by using the weighted median. Shi, Tuo, Ran, Ren, and Yang (2020) proposed a multi-hop average consensus time synchronization method to enhance algebraic connectivity of the network and improve convergence speed through virtual links.…”

Section: Introductionmentioning

confidence: 99%

MPC-based time synchronization method for V2V (vehicle-to-vehicle) communication

Chen

Zhan

Zhang

2023

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PurposeAs the strategy of 5G new infrastructure is deployed and advanced, 5G-R becomes the primary technical system for future mobile communication of China’s railway. V2V communication is also an important application scenario of 5G communication systems on high-speed railways, so time synchronization between vehicles is critical for train control systems to be real-time and safe. How to improve the time synchronization performance in V2V communication is crucial to ensure the operational safety and efficiency of high-speed railways.Design/methodology/approachThis paper proposed a time synchronization method based on model predictive control (MPC) for V2V communication. Firstly, a synchronous clock for V2V communication was modeled based on the fifth generation mobile communication-railway (5G-R) system. Secondly, an observation equation was introduced according to the phase and frequency offsets between synchronous clocks of two adjacent vehicles to construct an MPC-based space model of clock states of the adjacent vehicles. Finally, the optimal clock offset was solved through multistep prediction, rolling optimization and other control methods, and time synchronization in different V2V communication scenarios based on the 5G-R system was realized through negative feedback correction.FindingsThe results of simulation tests conducted with and without a repeater, respectively, show that the proposed method can realize time synchronization of V2V communication in both scenarios. Compared with other methods, the proposed method has faster convergence speed and higher synchronization precision regardless of whether there is a repeater or not.Originality/valueThis paper proposed an MPC-based time synchronization method for V2V communication under 5G-R. Through the construction of MPC controllers for clocks of adjacent vehicles, time synchronization was realized for V2V communication under 5G-R by using control means such as multistep prediction, rolling optimization, and feedback correction. In view of the problems of low synchronization precision and slow convergence speed caused by packet loss with existing synchronization methods, the observer equation was introduced to estimate the clock state of the adjacent vehicles in case of packet loss, which reduces the impact of clock error caused by packet loss in the synchronization process and improves the synchronization precision of V2V communication. The research results provide some theoretical references for V2V synchronous wireless communication under 5G-R technology.

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Section: Introductionmentioning

confidence: 99%

MPC-based time synchronization method for V2V (vehicle-to-vehicle) communication

Chen

Zhan

Zhang

2023

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“…Continuous control cannot be implemented in computational systems, so time-triggered and event-triggered control strategies are mainly adopted in practical industry. For time-triggered control [12][13][14][15][16][17], it is mainly triggered by a fixed time interval T . By changing the size of the time interval T , the limit of the number of communications can be achieved, but too large a time interval will cause the system to be less effective or even unstable, so now wireless sensor devices are more suitable for event-triggered control strategies.…”

Section: Introductionmentioning

confidence: 99%

Asynchronous broadcast‐based event‐triggered control for discrete‐time clock synchronization

Jia

Dai

Cui

et al. 2023

IET Control Theory & Appl

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Precise timing plays a key role in the time‐sensitive industrial Internet of Things (IIoT). However, precise time synchronization requires more frequent packet exchange, which consumes more communication bandwidth and energy. This is a particular challenge in battery‐powered wireless nodes, and low communication costs have become an important factor in clock synchronization. To address the challenge of achieving low communication cost clock synchronization in distributed wireless sensor networks, this paper proposes an improved event‐triggered control and synchronization scheme with a novel asynchronous broadcast packet exchange protocol. Unlike the traditional event‐triggered control scheme which is based on synchronous polling packet exchange, this proposed asynchronous broadcast packet exchange is more communication efficient and requires fewer number of packet exchanges. And it is worth noting that the proposed algorithm in this paper is a distributed algorithm and does not require real‐time acquisition of information from neighbouring nodes. Finally, a numerical example is given to illustrate the effectiveness of the proposed event‐triggered control strategy. The efficiency and precision of the proposed clock synchronization method is evaluated by intensive simulations, which show that the number of packet exchange is reduced by 60% for a moderate IIoT network and is particularly useful for large scale network.

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Consensus-based time synchronization via sequential least squares for strongly rooted wireless sensor networks with random delays

Wang

Gong

2022

Automatica

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Skew Estimation Based on Weighted Median for Average Consensus Time Synchronization in the Presence of Communication Delays

Cited by 8 publications

References 14 publications

MPC-based time synchronization method for V2V (vehicle-to-vehicle) communication

MPC-based time synchronization method for V2V (vehicle-to-vehicle) communication

Asynchronous broadcast‐based event‐triggered control for discrete‐time clock synchronization

Consensus-based time synchronization via sequential least squares for strongly rooted wireless sensor networks with random delays

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