Abstract
The vehicular safety applications disseminate the burst messages during an emergency scenario, but effort to reduce delay of communication are hampered by wireless access technology. As conventional VANET (Vehicular ad-hoc network) connected intermittently, the LTE-based framework has been established for the vehicular communication environment. However, resource allocation which affected by many factors, such as power, PRB (physical resource block), channel quality, are challenging to guarantee the safety services QoS in LTE downlink for OFDM. In order to solve the problem of safety message dissemination in LTE vehicular network, we proposed a delay-aware control policy by leveraging cross-layer approach to maximize the system throughput. First, we model the resource allocation problem using the queuing theory based on the MISO. Second, the method casts the problem of throughput and latency for dynamic communication system into a stochastic network optimization problem, and then makes tradeoffs between them by Lyapunov optimization technique. Finally, we use the improved the branch and bound algorithm to search optimal solution in system capacity region for these decomposed subproblems. The simulation results show that our algorithm can guarantee the delay while maximum system throughput
Highlights
All types of architecture for the vehicular communication networks rely on the wireless access technology, which is usually at the bottom of the communication protocols and provides air interface, in the process of exchanging safety message between mobility vehicle nodes [33], [27]
There is a lack of deterministic guarantees of service QoS because that the safety message is possible to be dropped when the communication system and links are overloaded or fail [15], [2]
We design a cross-layer schedule policy to improve the reliability and efficiency of safety message by reducing the message delay, and the network resource management mainly concentrates on the physical layer power allocation and network buffer
Summary
All types of architecture for the vehicular communication networks rely on the wireless access technology, which is usually at the bottom of the communication protocols and provides air interface, in the process of exchanging safety message between mobility vehicle nodes [33], [27]. There are two typical wireless access technology for safety message in vehicular network—DSRC (Dedicated Short-Range Communication) and cellular network [5], [3], [14]. In the previous scholarly output, the research of access technology mostly focused on VANET It transmits messages by cooperative communication between the vehicle nodes without the participation of the centralized infrastructure. LTE can provide a Round Trip Time theoretically lower than 10ms, and transfer latency in the radio access up to 100ms [19] This is especially beneficial for delay-sensitive vehicle safety applications. The reason mentioned above motivate LTE technology as a promising wireless broadband access technology to support communication under the vehicular network environment
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