Method and apparatus for soft switching between P2P communication mode and traditional communication mode in radio communication system

Abstract

The method is as the follows: detection is carried out for direct link which is used by user terminal to carry on P2P communication with another user termina; a request of switching in traditional communication mode is sent to a radio communication network system if direct link communication quality can not satisfies with requirements of P2P communication according to detection result; traditional communication link is established after switching in request confirmation sent from the network system is receive so that traditional communication mode is used to carry on communication with another user terminal.

Description

technical field [0001] The present invention relates to a wireless communication system capable of introducing P2P (point-to-point) communication, in particular to a method and device capable of performing soft switching between the P2P communication mode and the traditional communication mode of the wireless communication system. technical background [0002] In a traditional cellular mobile communication system, regardless of the distance between two communicating user terminals, a user terminal must be relayed by a base station to communicate with another user terminal. figure 1 shows this traditional communication mode, user terminals UE1 and UE2 exchange information through the Universal Mobile Communications System Terrestrial Radio Access Network (UTRAN) composed of base transceiver stations (Node B) and radio network controllers (RNC), which This communication mode is also called uplink-base station-downlink mode. But in some cases, when two users located in the sam...

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Problems solved by technology

[0007] However, when the user terminal performing P2P communication cannot perform P2P communication due to its mobility, the location and environment of the user terminal change, how to smoothly transition from P2P communication to the traditional communication mode without making it obvious to the communicating user? Perceived, it is a problem that needs to be considered when using P2P communication mode

[0008] In addition, when two user terminals using the traditional communication mode of uplink-base station-downlink for dialogue meet the conditions of P2P communication, a P2P link should be established between the two user terminals to save wireless resources and expand the wireless system. However, how to smoothly transition from the traditional communication mode to P2P communication without letting the users who are communicating are clearly aware of it will also be a challenge to introduce the P2P communication mode

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