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Method for switching communication connection mode, communication system, base station, transmitter and receiver

  • US 9,357,580 B2
  • Filed: 02/05/2014
  • Issued: 05/31/2016
  • Est. Priority Date: 02/07/2013
  • Status: Active Grant
First Claim
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1. A method for switching communication connection modes, adapted to a communication system comprising a transmitter, a receiver and at least one base station, and the method comprising:

  • when the at least one base station or a core network entity determines that a communication mode between the transmitter and the receiver requires to be switched from a cellular communication mode to a device-to-device communication mode, sending a control message by the at least one base station to the transmitter;

    stopping transmitting, by the transmitter, at least one first packet to the at least one base station in response to the control message;

    buffering, by the at least one base station, a plurality of transmission-unfinished packets and a plurality of transmission-unfinished packet statuses related to the transmission-unfinished packets, wherein the transmission-unfinished packets are packets have been received, by the at least one base station, from the transmitter but have not been transmitted, by the at least one base station, to the receiver in the cellular communication mode, wherein each of the transmission-unfinished packet statuses is a packet data convergence protocol sequence number of each of the transmission-unfinished packets; and

    receiving, by the receiver, the transmission-unfinished packets and the transmission-unfinished packet statuses related to the transmission-unfinished packets forwarded by the at least one base station before the at least one base station or the core network entity has completed switching the communication mode between the transmitter and the receiver from the cellular communication mode to the device-to-device communication mode.

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