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Cooperative transmission in wireless communication system

  • US 9,112,695 B2
  • Filed: 09/23/2008
  • Issued: 08/18/2015
  • Est. Priority Date: 09/23/2008
  • Status: Active Grant
First Claim
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1. A method, comprising:

  • establishing a cooperative data transmission mode, wherein at least one wireless communication device is an assisting transmitter and a potential re-transmitter for another wireless communication device being an original transmitter of a data packet destined to a receiver in an original transmission, wherein the establishing comprises the original transmitter;

    contacting the receiver to obtain an identifier for the assisting transmitter to allow the original transmitter to transmit to the assisting transmitter,transmitting its own data packets to the assisting transmitter, andreceiving an acknowledgment message or no acknowledgment message from the assisting transmitter,wherein receiving a positive acknowledgment message from the assisting transmitter means that the assisting transmitter is determined to have received the data packets, andwherein receiving a negative acknowledgment message or no acknowledgment message from the assisting transmitter means that the assisting transmitter is determined to not have received the data packets;

    determining whether or not a data packet transmitted by the original transmitter in the original transmission is received at the receiver, wherein the determining comprises the original transmitter;

    transmitting its own data packets to the receiver,receiving an acknowledgment message or no acknowledgment message from the receiver,wherein receiving a positive acknowledgement message from the receiver means that the receiver is determined to have received the data packets, andwherein receiving a negative acknowledgment message or no acknowledgment message from the receiver means that the receiver is determined to not have received the data packets; and

    selecting, when the receiver is determined as not having received the data packet, a re-transmitter among the original transmitter and the assisting transmitter which received the data packet from the original transmitter coincident with the original transmission to the receiver and decoded the data packet, wherein the selecting comprises the original transmitter;

    in response to a positive acknowledgement message from the receiver, not retransmitting,in response to a negative acknowledgment message or no acknowledgment message from the receiver and a positive acknowledgement message from the assisting transmitter, indicating to the assisting transmitter to retransmit, andin response to a negative acknowledgment message or no acknowledgment message from the receiver and a negative acknowledgment message or no acknowledgment message from the assisting transmitter, retransmitting by the original transmitter itself.

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