Apparatus and method for performing ARQ in multi-hop relay cellular network
First Claim
1. A method for performing an automatic repeat request (ARQ) operation of a base station (BS) in a cellular network, the method comprising the steps of:
- determining if there is an error in a received uplink (UL) signal upon receipt of the uplink (UL) signal from a mobile station (MS);
comparing a channel condition for a relay station (RS) with a channel condition for the MS if there is the error in the received UL signal;
determining if the RS knows the erroneously received UL signal if the channel condition for the RS is better than the channel condition for the MS; and
requesting the RS to retransmit the erroneously received UL signal if the RS knows the erroneously received UL signal.
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Accused Products
Abstract
Provided is an apparatus and method for performing an ARQ operation for a uplink (UL) signal in a multi-hop relay cellular network. Upon receipt of a UL signal from a mobile station (MS), it is determined if there is an error in the received UL signal. If there is an error in the received UL signal, the channel condition for a relay station (RS) is compared with the channel condition for the MS. If the channel condition for the RS is better than the channel condition for the MS, it is determined if the RS knows the erroneously received UL signal. If the RS knows the erroneously received UL signal, the RS is requested to retransmit the erroneously received UL signal.
26 Citations
28 Claims
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1. A method for performing an automatic repeat request (ARQ) operation of a base station (BS) in a cellular network, the method comprising the steps of:
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determining if there is an error in a received uplink (UL) signal upon receipt of the uplink (UL) signal from a mobile station (MS);
comparing a channel condition for a relay station (RS) with a channel condition for the MS if there is the error in the received UL signal;
determining if the RS knows the erroneously received UL signal if the channel condition for the RS is better than the channel condition for the MS; and
requesting the RS to retransmit the erroneously received UL signal if the RS knows the erroneously received UL signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for performing an automatic repeat request (ARQ) operation of a relay station (RS) in a cellular network, the method comprising the steps of:
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determining if there is an error in the received UL signal upon receipt of an uplink (UL) signal from a mobile station (MS);
transmitting an ACK response message to the MS and a base station (BS) if there is no error in the received UL signal; and
selecting a retransmission signal according to the request signal and transmitting the selected retransmission signal to the BS if a retransmission request signal is received from the BS. - View Dependent Claims (10, 11, 12)
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13. A method for performing an automatic repeat request (ARQ) operation of a mobile station (MS) in a cellular network, the method comprising the steps of:
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determining if a response signal for the UL signal is received after transmission of an uplink (UL) signal to a base station (BS) and a relay station (RS);
determining if a retransmission request signal for the UL signal is received from the BS when a NACK response signal is received from the BS; and
selecting a retransmission signal according to the request and transmitting the selected retransmission signal to the BS if the retransmission request signal is received. - View Dependent Claims (14)
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15. A method for performing an automatic repeat request (ARQ) operation of a base station (BS) in a cellular network, the method comprising the steps of:
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determining if a response message is received from the MS and the RS that has received the DL signal after transmission of a downlink (DL) signal to a mobile station (MS) and a relay station (RS);
comparing the channel condition of a link between the RS and the MS with the channel condition of a link between the BS and the MS if the received response message is a NACK response message;
determining if the RS knows the erroneously received DL signal if the link between the RS and the MS is better in channel condition than the link between the BS and the MS; and
requesting the RS to retransmit the erroneously received DL signal to the MS if the RS knows the erroneously received DL signal. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A method for performing an automatic repeat request (ARQ) operation of a relay station (RS) in a cellular network, the method comprising the steps of:
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upon receipt of a downlink (DL) signal from a base station (BS), determining if there is an error in the received DL signal;
transmitting an ACK response message to the BS and a mobile station (MS) if there is no error in the received DL signal; and
retransmitting a retransmission signal corresponding to the retransmission request signal to the MS if a retransmission request signal is received from the BS. - View Dependent Claims (22, 23, 24)
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25. A base station (BS) transmitter for performing an automatic repeat request (ARQ) operation in a cellular network comprising:
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a retransmission selector for detecting the channel conditions of a relay station (RS), a mobile station (MS) and a base station (BS) to select which among them is to retransmit a signal; and
an ARQ controller for determining a coding rate, a modulation scheme and a frame size of the retransmission signal. - View Dependent Claims (26, 27, 28)
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Specification