Method and apparatus for controlling retransmission on uplink in a wireless communication system supporting MIMO
AssigneeSamsung Electronics Co., Ltd.
InventorsJin-Kyu Han, Youn-Sun Kim, Myung-Hoon Yeon, Han-Il Yu
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Abstract
A method is provided for controlling retransmission by a User Equipment (UE) in a wireless communication system supporting Multiple Input Multiple Output (MIMO) technology. A plurality of transport blocks is initially transmitted to a Node B. A retransmission request for at least one transport block among the plurality of transport blocks is received from the Node B. A precoding matrix for retransmission of the at least one transport block is determined based on the retransmission request for the at least one transport block. The at least one transport block is retransmitted using the determined precoding matrix.
Claims36
A method for controlling retransmission by a User Equipment (UE) in a wireless communication system supporting Multiple Input Multiple Output (MIMO) technology, comprising the steps of:
- initially transmitting a plurality of transport blocks to a Node B, and receiving a negative acknowledgement (NACK) for at least one transport block among the plurality of transport blocks, from the Node B;
- determining a precoding matrix for retransmission of the at least one transport block in response to the NACK for the at least one transport block;
- and
- retransmitting the at least one transport block using the determined precoding matrix,
- wherein the precoding matrix is determined based on a number of layers corresponding to the at least one transport block negatively acknowledged (NACKed) from the Node B, if the UE does not receive a Physical Downlink Control CHannel (PDCCH) intended for the UE from the Node B.
A User Equipment (UE) for controlling retransmission in a wireless communication system supporting Multiple Input Multiple Output (MIMO) technology, comprising:
- a transceiver for exchanging data with a Node B over a wireless network;
- and
- a controller for initially transmitting a plurality of transport blocks to the Node B, receiving a negative acknowledgement (NACK) for at least one transport block among the plurality of transport blocks, from the Node B, determining a precoding matrix for retransmission of the at least one transport block in response to the NACK for the at least one transport block, and retransmitting the at least one transport block using the determined precoding matrix,
- wherein the precoding matrix is determined based on a number of layers corresponding to the at least one transport block negatively acknowledged (NACKed) from the Node B, if the UE does not receive a Physical Downlink Control CHannel (PDCCH) intended for the UE from the Node B.
A method for controlling retransmission by a Node B in a wireless communication system supporting Multiple Input Multiple Output (MIMO) technology, comprising the steps of:
- receiving a plurality of transport blocks transmitted by a User Equipment (UE) in an initial transmission;
- transmitting a negative acknowledgement (NACK) for at least one transport block to the UE, if at least one transport block among the plurality of transport blocks has failed to be decoded;
- determining a precoding matrix that the UE uses during retransmission of the at least one transport block in response to the NACK for the at least one transport block;
- and
- receiving the at least one transport block retransmitted using the determined precoding matrix,
- wherein the precoding matrix is determined based on a number of layers corresponding to the at least one transport block negatively acknowledged (NACKed) from the Node B, if the UE does not receive a Physical Downlink Control CHannel (PDCCH) intended for the UE from the Node B.
A Node B for controlling retransmission in a wireless communication system supporting Multiple Input Multiple Output (MIMO) technology, comprising:
- a transceiver for exchanging data with a User Equipment (UE) over a wireless network;
- and
- a controller for receiving a plurality of transport blocks transmitted by the UE in an initial transmission, transmitting a negative acknowledgement (NACK) for at least one transport block to the UE, if at least one transport block among the plurality of transport blocks has failed to be decoded, determining a precoding matrix that the UE uses during retransmission of the at least one transport block in response to the NACK for the at least one transport block, and receiving the at least one transport block retransmitted using the determined precoding matrix,
- wherein the precoding matrix is determined based on a number of layers corresponding to the at least one transport block negatively acknowledged (NACKed) from the Node B, if the UE does not receive a Physical Downlink Control CHannel (PDCCH) intended for the UE from the Node B.
Dependencies are inferred from the claim text.