Investigating the Effect of Distance and TXOP Allocation Limit in IEEE 802.11bd Networks

The recent IEEE 802.11bd communication technology allows next-generation vehicle (NGV) devices to make use of wide channels using channel bonding, both with and without fallback, in addition to multiple packet transmission using transmission opportunity (TXOP) allocation. To evaluate its performance in an environment which also contains legacy or non-NGV devices that do not support TXOP allocation, we develop a detailed analytical model through probabilistic modeling and Markov chain analysis. The model includes data rate scaling with distance from the roadside unit (RSU). Performance analysis provided by the model shows that enhanced distributed channel access (EDCA), which is available for both NGV and legacy devices, provides noticeable prioritization of traffic; that TXOP allocation leads to better performance by an amount which depends on the traffic priority level; and that NGV devices that use fallback experience better performance than either legacy devices or NGV devices that do not use fallback.