Method for optimizing perception timeslot length based on state transition probability evaluation

Abstract

The invention relates to a method for optimizing the perception timeslot length based on state transition probability evaluation. The method provided by the invention comprises the following steps: in the beginning of sensing a period perception timeslot, a cognitive wireless network center Node B sends a perception channel set which needs cooperation perception in the ta time and the perception time of each authorized channel in the set to a cognitive user; the cognitive user carries out the cooperation perception in the authorized channels in the ts time and sends the perception results to the Node B in the tb time; the Node B fuses the perception results and sends the fusion result to the cognitive user in the tc time; and after the perception timeslot is completed, the Node B utilizes the residual T-t time to evaluate the usable probability of each authorized channel in the next perception period and selects the channel set which needs the cooperation perception for a cognitive wireless network in the next perception period and the perception time of each authorized channel in the set and sends to the cognitive user in the beginning moment of the next perception period. The method provided by the invention can optimize the perception timeslot length of the cognitive wireless network in each perception period and improves the throughput of a system.

Description

technical field [0001] The invention relates to the field of cognitive radio in wireless communication technology, in particular to a method for optimizing the length of a sensing time slot in cognitive radio cooperative spectrum sensing. Background technique [0002] With the rapid growth of types of wireless communication services, the demand for wireless spectrum resources is also increasing exponentially, which makes the problem of "lack" of spectrum resources in future wireless communications increasingly prominent. Cognitive radio technology utilizes the idle frequency band of licensed users in the way of "opportunistic access" under the condition of ensuring the quality of service of licensed users, which greatly improves the efficiency of spectrum use and is an effective way to solve the problem of "spectrum scarcity". Spectrum sensing technology is used to effectively detect the current working status of licensed users to find spectrum opportunities and avoid interf...

AI Technical Summary

Problems solved by technology

Although increasing the length of the sensing time slot can effectively improve the performance of cooperative spectrum sensing in cognitive wireless networks, reduce the loss of spectrum opportunities and the interference to licensed users, but under the condition of a given sensing cycle length, the increase of the length of the sensing time slot will lead to The cognitive wireless network spends less time on data transmission in the sensing cycle, which reduces the transmission efficiency of the cognitive wireless network. Therefore, the length of the sensing time slot in each sensing cycle should be optimally configured, that is, between the sensing performance and the system A trade-off between the transmission efficiency and the size of the perception slot length

Images