hyctra

Requirements: Matlab

hcytra is the simulation source code for PreBOTRA and DABTRA paper as in H. M. Gursu; M. Vilgelm; W. Kellerer; M. Reisslein, "Hybrid Collision Avoidance-Tree Resolution for M2M Random Access," in IEEE Transactions on Aerospace and Electronic Systems , vol.PP, no.99, pp.1-1.

Please cite the paper in case you use the simulator in your work.

Contibutors: H. Murat Gürsu

Inputs:

1. "dist" is the distribution variable:

• 1 is delta arrivals sets initial access to 1 for each user
• 2 is beta arrival distributes the users according to beta parameters
• 3 is poission arrivals distributes the users on a poisson based fashion

2. "PB" is the Collision Avoidance parameter

• 0 no- prebackoff
• 1 prebackoff
• 2 dynamic Access Barring
• 3 PDFSA (Another hybrid protocol similar to "access barring + tree")

3. "PBP" is he prebackoff size parameter it is also used for back-off in cases without prebackoff or AB

4. "T_A" is the activation time of the beta distribution

5. branchsize is the tree algorithm parameter for branching size

• 1 for non-tree algorithms
• > for any branchsize as wished

6. Other variables are self explanatory

Outputs

1. coll_rat = Ratio of collided slots to all slots used
2. drop_rat = Ratio of dropped users to all users
3. suc_rat = Ratio of accessed users to all users (should be 1 - drop_rat (sanity check))
4. mean_delay = Mean delay of all successful users
5. tp_mean = Ratio of succesful slots to all slots used
6. mean_retx = Mean number of transmissions for each user