Age of information (AoI) is an effective performance metric to measure data freshness in short packet communication. In this paper, we investigate AoI for decode-and-forward (DF) relay systems in the time division duplex (TDD) mode in short packet communication with a number of resources, such as blocklength, transmission power and channels. We formulate an average AoI minimization problem for DF relay systems in the TDD mode with multiple resources. We propose a joint multi-resource optimization (JMO) algorithm to minimize average AoI by simultaneously optimizing blocklength, transmission power and channels. Thus, the proposed JMO algorithm can significantly reduce average AoI, as compared to the previous work just considering blocklength optimization (BO). We prove that BO is independent of power allocation (PA) and channel allocation (CA), and can be decoupled to minimize AoI independently. Thus, the complex problem can be decomposed into a BO subproblem and a PA-and-CA subproblem. We propose a BO algorithm to successively optimize blocklengths in two hops using golden section method. We propose a joint power and channel allocation (JPCA) algorithm to further reduce AoI in an iterative manner. We propose a maximum multiplication (MM) based CA criterion, where CA is performed by maximizing the multiplication between two signal-to-noise ratios (SNRs) in two hops. Thus, the proposed MM-based CA criterion provides AoI performance better than the max-min based CA criterion only maximizing the smaller SNR in two hops.
Optimized Age of Information for Relay Systems with Resource Allocation
24.06.2024
777624 byte
Aufsatz (Konferenz)
Elektronische Ressource
Englisch