Abstract
In recent years, with the spectrum resources in low frequency bands becoming increasingly insufficient, the carrier frequency of wireless communication has started its evolution to the Terahertz (THz) frequency band, and meanwhile the THz communication system has become one of the research hot spots. In this paper, we investigate the problem of concurrent transmission scheduling for THz wireless backhaul network. To increase the weighted sum of completed flows with their quality of service (QoS) requirements satisfied in THz wireless backhaul network, we propose an algorithm of QoS-aware bandwidth allocation and concurrent scheduling (IHQB). Considering the priority of the flow, the reciprocal of the priority is taken as the weight of the flow. In this algorithm, QoS awareness and bandwidth allocation are exploited to achieve more successfully scheduled flows and higher network throughput. The concurrent scheduling with the maximum independent set (MIS) is allocated to different frequency bands. And the mentioned MIS is obtained from the conflict graph which has been established under the conditions of half-duplex and interference threshold. Simulation results show that IHQB performs better than other algorithms in terms of the weighted sum of completed flows and system throughput, especially compared with STDMA.
Highlights
According to Edholm’s law of bandwidth [1], wireless data rates have doubled every 18 months over the last three decades and are quickly approaching the capacity of wired communication system [2]
In order to maximize the weighted sum of completed flows, the algorithm schedules the flows with high priority first and chooses the maximum independent set (MIS) as flow set of concurrent scheduling in each slot segment of each frequency band
Through lots of simulations and debuggings, we discover that compared with the case of α = 6, the number of frequency band divided for IHQB is reduced by 6 under α = 8, resulting in a significant decrease in the number of flows that can be transmitted in each time slot, and compared with the case of α = 12, the number of frequency band divided for IHQB is only increased by 4 under α = 8, but the bandwidth of each frequency band is reduced by 4GHz, which causes more number of time slots (TSs) allocated for each slot segment of each frequency band
Summary
According to Edholm’s law of bandwidth [1], wireless data rates have doubled every 18 months over the last three decades and are quickly approaching the capacity of wired communication system [2]. H. Jiang et al.: QoS-Aware Bandwidth Allocation and Concurrent Scheduling for Terahertz Wireless Backhaul Networks [6]. In [16], this paper is full-duplex concurrent scheduling in mmWave wireless backhaul network, whose system throughput is only up to 60Gbps. For THz wireless network, in [17], there has been proposed a distance-aware bandwidth-adaptive resource allocation scheme for wireless systems in the THz band on each sub-window, whose data rate reaches 100Gbps It is not practical for wireless backhaul network because of the short transmission distance and its bandwidth allocation is about a flow occupying a frequency band, which doesn’t make use of the concurrent transmission. In an attempt to solve this problem including three points, we propose a new concurrent scheduling algorithm, which combines QoS with bandwidth allocation under half-duplex communication. A QoS-aware bandwidth allocation and concurrent scheduling algorithm for terahertz wireless backhaul networks. Interference between flows that are in different frequency bands is negligible
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