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Frequency spectrum switching method in distributed cognitive radio network

A cognitive radio and spectrum switching technology, which is applied in the field of spectrum switching in distributed cognitive radio networks to ensure continuous communication.

Inactive Publication Date: 2010-10-13
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

Although the mobile-based handover mechanism in traditional cellular networks provides a certain research basis for this problem, there are still many unresolved open topics for further research

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  • Frequency spectrum switching method in distributed cognitive radio network
  • Frequency spectrum switching method in distributed cognitive radio network
  • Frequency spectrum switching method in distributed cognitive radio network

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Embodiment Construction

[0026] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0027] First, the preferred frequency point neighbor list PFNT (Preferable Frequencies and Neighbors Table) is described.

[0028]In a distributed cognitive radio network, each node has a unique ID (Identification), monitors the surrounding channel conditions, and periodically sends PS (PeriodicSignaling) on ​​the common control channel CCC (Common Control Channel) to notify itself state. Each node establishes and maintains its own preferred frequency point neighbor list PFNT, as shown in Table 1. The PFNT of each node is established and updated by monitoring the surrounding channel status and the periodic signaling PS sent by other nodes. The monitoring range and the period of sending PS can be adjusted according to specific req...

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Abstract

The invention discloses a frequency spectrum switching method in a distributed cognitive radio network. Cognitive users establish and maintain the own preferred frequency point neighbor list and a route cache list. When the cognitive users as the source nodes detect the authorized users, the cognitive users performs the following steps of: updating the own preferred frequency point neighbor list; judging whether available frequency point exists between the cognitive users and the next hop neighbor node, if so, selecting a first new frequency point according to the available frequency point and transmitting data on the new frequency point, updating the available frequency point in the preferred frequency point neighbor list to available frequency point around the first new frequency point, and updating corresponding neighbor node; and otherwise, combining the route caching list for switching frequency spectrum. The invention takes route factor into consideration according to characteristics of the distributed network cognitive environment, provides the specific frequency spectrum switching flow and signaling design thereof and ensures completion of frequency spectrum switch, thereby ensuring the persistence of communication of the cognitive users.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a spectrum switching method in a distributed cognitive radio network. Background technique [0002] In a distributed cognitive radio network, there are authorized users and cognitive users. Authorized users have priority to occupy the spectrum; cognitive users have the cognitive ability to dynamically monitor the spectrum occupancy of authorized users, and use the idle spectrum not occupied by authorized users to communicate. When it is detected that authorized users start to occupy this spectrum, or when the current spectrum cannot meet the service requirements of cognitive users, cognitive users give up the spectrum and switch to other suitable spectrums to continue unfinished communication. This process is known as spectrum switching in cognitive radio networks. [0003] The distributed cognitive radio network is composed of users as network nodes autonomously...

Claims

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Application Information

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IPC IPC(8): H04W40/02H04W40/24
Inventor 乔晓瑜谈振辉徐少毅黄清叶海纳张华晶
Owner BEIJING JIAOTONG UNIV
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