A tdma-ofdm combined security information transmission channel resource block allocation method
A technology for resource block allocation and security information, which is applied in the field of resource block allocation of security information transmission channels, can solve problems such as increased interference, inability of deaf nodes to communicate with them normally, and directional coverage is likely to cause blind spots, etc. Realize the effect of sequential allocation and avoid time delay such as return
Active Publication Date: 2022-01-28
LANZHOU UNIVERSITY OF TECHNOLOGY
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However, the interference received by other nodes within the coverage area is also increased compared with other methods, and its directional coverage is prone to blind spots, even if the nodes are very close, they are not within its coverage area, resulting in a large number of deaf nodes. communication
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Embodiment 1
[0030] A TDMA-OFDM joint safety information transmission channel resource block allocation method, through the division of resource blocks in the period of control channel transmission safety information and assigning resource blocks to nodes according to the priority order, aiming at the 10MHz bandwidth control in the IEEE1609.4 protocol channel, divide the TDMA time slot occupied by the security information transmission into M×N OFDM resource blocks;
[0031] The method of allocating the resource blocks is to assign them to the nodes sequentially according to the time order of the nodes entering the network; when a new node joins the network, it will obtain the idle resource block with the highest priority in time; when the node leaves the network, it will release the resource block occupancy; isolated nodes use the highest priority idle resource block by default; in the situation where a new node joins the network to obtain the highest priority idle resource block in terms o...
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The invention discloses a TDMA-OFDM joint security information transmission channel resource block allocation method, which belongs to the technical field of wireless channel allocation in the Internet of Vehicles. The invention divides the resource blocks in the cycle of transmitting safety information through the control channel and assigns the resource blocks to the nodes according to the priority order for allocation. The present invention distinguishes channel resources in terms of frequency, thereby overcoming the problem of insufficient channel resources. The invention fixedly allocates the divided channel resources to the nodes in the network, and eliminates the conflict problem caused by competition. By adopting the method in the present invention, the back-off time delay caused by adopting CSMA / CA when a large number of nodes compete for channels is avoided. The method of the invention effectively solves the problem that the high-speed dense node group cannot access the channel to transmit safety information in time due to high node density and fast movement speed.
Description
technical field [0001] The invention belongs to the technical field of wireless channel allocation in the Internet of Vehicles, and in particular relates to a TDMA-OFDM joint security information transmission channel resource block allocation method. Background technique [0002] At present, with the large-scale increase of wireless mobile nodes and the increasing demand for accessing the network during movement, a fast-moving dense node group is formed in a specific scenario (such as a vehicle networking environment); in a large-scale dense node group environment , when a large number of nodes transmit security information through competition to obtain channel resources, there are serious channel access conflicts, and then the back-off algorithm is used to increase the back-off time, and the security information is not transmitted in time, which is likely to cause security hazards. A TDMA-OFDM joint fixed allocation method of channel resource blocks for safety information t...
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IPC IPC(8): H04L5/00H04W4/40H04W72/04H04W72/10
CPCH04W4/40H04W72/0446H04L5/0007H04L5/003H04W72/56
Inventor 张霞张恩展姚毓凯顾群纪东升张玺君谢鹏寿马维俊李英堂何继爱
Owner LANZHOU UNIVERSITY OF TECHNOLOGY