A channel access method and channel access device

Abstract

The embodiment of the present invention discloses a channel access method and a channel access device, wherein the channel access method includes: acquiring a common frequency hopping sequence for channel access; indicating the first element of the common frequency hopping sequence If the channel indicated by the first element is determined to be idle, then: start from the channel access time slot and the second element according to the order of time slots and the order of elements of the common frequency hopping sequence, In the next time slot in turn, select the channel indicated by the next bit element of the common frequency hopping sequence to perform channel access; wherein, the channel access time slot is when it is determined that the state of the channel indicated by the first element is idle the time slot next to the slot, the second element is the next bit element of the first element in the common frequency hopping sequence. The technical solution provided by the invention can improve the service delay performance of the secondary user under the premise of avoiding a large amount of information interaction overhead.

Description

technical field [0001] The present invention relates to the communication field, in particular to a channel access method and a channel access device. Background technique [0002] Cognitive radio is one of the most promising technologies to solve the problem of spectrum shortage and underutilization. Allowing secondary users (ie Secondary Users) in the network to dynamically use channels (ie idle spectrum) allocated to primary users (ie Primary Users) but not currently occupied, thus effectively improving spectrum utilization. However, when the channel is continuously occupied by the primary user for a long time, the secondary user service will face a long wait, and the delay performance is poor. Especially in cognitive wireless systems with multiple channels and multiple users, the channel access and allocation mechanism will further affect the delay performance of secondary user services. [0003] Existing channel access and allocation schemes can be classified into qua...

AI Technical Summary

Problems solved by technology

Since the channels are independently and randomly selected, multiple secondary users may select the same channel for data transmission in the same time slot, resulting in collisions, resulting in packet loss, retransmission, and waste of resources, resulting in poor service delay performance

The dynamic channel allocation scheme coordinated by the central controller performs channel allocation in each time slot according to the state of the channel and the waiting time of the secondary users. Theoretically, the optimal delay performance can be achieved. State information and delay information of secondary users require a large amount of information interaction overhead, and the complexity of the allocation algorithm is also high, which is not suitable for cognitive wireless systems with highly dynamic channel states

Images