A channel accessing method and channel accessing device

Abstract

Embodiments of the present invention disclose a channel accessing method and a channel accessing device, wherein, a channel accessing method includes: acquiring a public frequency hopping sequence for channel accessing; performing full time slot perception on a channel indicated by a first element of the public frequency hopping sequence; and if the state of the channel indicated by the first element is idle, starting from the channel accessing time slot and the second element, selecting a channel indicated by the next element of the public frequency hopping sequence to perform channel accessing successively in the next time slot based on the time slot order and the element order of the public frequency hopping sequence; wherein, the channel accessing time slot is a time slot next to the time slot determining the state of the channel indicated by the first element is idle, and the second element is an element next to the first element in the public frequency hopping sequence. The technical solution provided in the present invention can increase the service delay performance of the secondary user on the premise that a large amount of information interactive overhead is avoided.

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

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