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Method and system for establishing a direct radio communication between two or more user devices in a cellular mobile communication system

A technique of user equipment, communication system, applied in the field of processes and systems for establishing direct radio communication between two or more user equipment within a mobile cellular communication system

Inactive Publication Date: 2009-05-20
VODAFONE GRP PLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One of the aspects about this idea is that current radiocommunication systems do not fully utilize the entire spectrum available to them, i.e. given any time and place (within the geographical area authorized for the system), there is a high probability that there will be Spectrum dedicated to more communications than ongoing communications (transmission / reception)

Method used

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  • Method and system for establishing a direct radio communication between two or more user devices in a cellular mobile communication system
  • Method and system for establishing a direct radio communication between two or more user devices in a cellular mobile communication system
  • Method and system for establishing a direct radio communication between two or more user devices in a cellular mobile communication system

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Experimental program
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Embodiment Construction

[0070] Figure 1 shows how a terminal can detect and select free resources: in this example, the frequencies of the operator's spectrum are not used in this area and their use does not interfere with the work of the network.

[0071] First, it involves finding free channels or resources in the cellular system - ie, those that are not being used and preferably do not affect the correct operation of the system (ie they do not cause interference) if mobile devices use them. Cellular systems mainly use three types of resource multiplexing: frequency (FDM), time (TDM) and code (CDM). What is called a resource or a channel is usually a combination of these.

[0072] In the GSM system, a channel corresponds to a combination of frequency and time slot (TS). Each frequency contains two pairs of 200KHz+200KHz carriers in the 900, 1800 (Europe) or 850, 1800 (US) bands. Furthermore, for each frequency, time is divided into consecutive segments or frames (4.615 ms per frame), such that ea...

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Abstract

The invention relates to a process for setting up direct radio communication between two or more user devices within a mobile cellular communications system, said users subscribing to the same operator, comprising: - using a cognitive radio technique to detect spectrum resources available for radio communications in a certain area within which said at least two user devices are located, characterized in that the process further comprises: - selecting at least one resource from among the available resources, said resource being a resource of the operator common to said two or more user devices, and - setting up a direct radio link between said two users using said detected free resource of the operator. The invention also relates to a system for setting up direct radio communication between two or more user devices within a mobile cellular communications system.

Description

technical field [0001] In the field of mobile telecommunications, the present invention relates to the ability to know the radio environment in which a mobile terminal is located and to make decisions based on this knowledge. More specifically, it concerns the possibility of establishing direct radio communication between terminals forming part of a cellular system by using cognitive radio technology. Background technique [0002] Cognitive radio is a relatively new concept in the field of research and development (first proposed by Joseph Mitola of the Royal Institute of Technology in "Cognitive Radio. An Integrated Agent Architecture for Software Defined Radio Dissertation" on May 8, 2000; however, it has attracted industry of interest and will undoubtedly appear in future telecommunications systems. Cognitive radio is based on the fact that the user's communication device is able to understand the radio environment in which it is located and uses this knowledge to make de...

Claims

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Application Information

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IPC IPC(8): H04W4/10H04W76/02H04W72/02H04W72/08H04W88/04
CPCH04W72/08H04W72/02H04W4/10H04W76/023H04W88/04H04W76/005H04W76/45H04W76/14H04W72/54
Inventor D·阿尔莫多瓦埃雷斯J·E·卡巴列罗埃雷罗F·J·鲁比奥安德烈斯
Owner VODAFONE GRP PLC
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