Similarly, the cluster members regularly broadcast Cluster Member Announcement (CMA) packets containing the cluster member's ID, position, velocity, and direction.
At the same time, when there are cluster heads in the network, the heads also broadcast their information, called Cluster Head Announcement (CHA) packets that contain the cluster head's ID, position, velocity, and direction.
Table 1 Next-Hop Forwarding Link ID Position Velocity Moving direction Timestamp Lifetime n 1 (x1, y1) v 1 θ 1 t 1 △t1 n 2 (x2, y2) v 2 θ 2 t 2 △t2.
Table 2 The improved PIT Prefix Face Receive time (s) Tolerance time (s) /car1/video/ip3.mp4 6.400402 6.400 /car5/video/ip2.mp4 5 30.408 6.400 Table 3 Neighbor table Neighbor nodes V(m/s) (X, Y) cosθ Link expiration time Link available probability Neighbor's ID Motion velocity Position in digital map Motion direction .
The data record is denoted by <t,d a t a>, where t stands for timestamp, data includes the vessel's ID, location, direction, velocity and so on.
Vectors X i = (x 1i, x 2i,…, x Di ), V i = (v 1i, v 2i,…, v Di ) and Pbest = (Pbest i1, Pbest i2, …, Pbest iD ) Shows position, velocity, and the best personal position of each particle respectively.
The position of the ith particle is represented as X i = (x i 1, x i 2,…, x iD ), and the velocity V i = (v i 1, v i 2,…, v iD ), where 1 ≤ i ≤ N. The positions and velocities of particles are confined within [ X min, X max] D and [ V min, V max] D, respectively.
We include the node's position, moving velocity, road ID, and next road ID in announcement packets as shown in Table 2.
Velocities v id new and v id old denote the dth velocities of the ith particle in the current and the last generations, respectively.
