IMPROVING DELAY PERFORMANCE FOR TIME-CRITICAL COMMUNICATIONS IN VANET
Keywords:
Time-Critical Communications, opportunistic scheduling, VANET, TEOSAbstract
To ensure the functionality of intelligent transportation, time-critical information is of great importance in Vehicular Ad-hoc Network (VANET). Meanwhile, non-time-critical information still exists in the network, with which regular services can be provided. A key problem in VANET is to guarantee delay performance for time-critical trac while still satisfying demand of non-time-critical trac. To achieve this object, a multiple threshold policy derived from TEOS (Threshold Enabled Opportunistic Scheduling) is studied in this paper. With this policy, overall channel eciency is optimized while a throughput requirement from the non-time-critical trac is still considered. Thus, two objects can be achieved simultaneously: time-critical packets can have a better channel access probability as a result of a more free channel; and non-time-critical trac can be transmitted as required. Numerical results and simulations show that this approach can provide smaller delay for time-critical transmissions in VANET.
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