Retransmission in wireless communication systems
First Claim
1. A method for reducing retransmission delays in a wireless communication system with Automatic Repeat reQuest (ARQ) retransmission functionality, comprising:
- sending a protocol data unit (PDU) from a transmitting side towards a receiving side;
monitoring, at the transmitting side, a low-level control signal from the receiving side, the low-level control signal being associated with a lower protocol layer than the layer of the ARQ retransmission functionality; and
deciding whether a retransmission of the PDU is to take place based on information included in the low-level control signal;
wherein the low-level control signal is a power control command and the included information comprises power control information;
wherein the deciding step in turn comprises determining the number of power up commands from the receiving side for a predetermined period of time, whereby a high number of power up commands is an indication for retransmission.
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Accused Products
Abstract
The invention relates to retransmissions in wireless communication systems. It is proposed to reduce the retransmission delays by utilizing feedback associated with a lower protocol layer than the conventional feedback messages of the ARQ functionality. After sending a packet from a transmitter towards a receiver, the transmitter monitors the link for a low-level control signal from the receiver. The low-level control information can e.g. comprise power control commands or be related to link quality indicators. Based on this signal, it is decided whether a retransmission is to take place, e.g. at the transmitter or at an external control unit.
25 Citations
30 Claims
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1. A method for reducing retransmission delays in a wireless communication system with Automatic Repeat reQuest (ARQ) retransmission functionality, comprising:
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sending a protocol data unit (PDU) from a transmitting side towards a receiving side; monitoring, at the transmitting side, a low-level control signal from the receiving side, the low-level control signal being associated with a lower protocol layer than the layer of the ARQ retransmission functionality; and deciding whether a retransmission of the PDU is to take place based on information included in the low-level control signal; wherein the low-level control signal is a power control command and the included information comprises power control information; wherein the deciding step in turn comprises determining the number of power up commands from the receiving side for a predetermined period of time, whereby a high number of power up commands is an indication for retransmission.
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2. A method for reducing retransmission delays in a wireless communication system with Automatic Repeat reQuest (ARQ) retransmission functionality, comprising:
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sending a protocol data unit (PDU) from a transmitting side towards a receiving side; monitoring, at the transmitting side, a low-level control signal from the receiving side, the low-level control signal being associated with a lower protocol layer than the layer of the ARQ retransmission functionality; and deciding whether a retransmission of the PDU is to take place based on information included in the low-level control signal and on the basis of the information included in the low-level control signal retransmitting the PDU from the transmitting side towards the receiving side in accordance with the deciding step and without having received an ARQ response message for the PDU. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9)
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10. A method for reducing retransmission delays in a wireless communication system with Automatic Repeat reQuest (ARQ) retransmission functionality, comprising:
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sending a protocol data unit (PDU) from a transmitting side towards a receiving side; monitoring, at the transmitting side, a low-level control signal from the receiving side, the low-level control signal being associated with a lower protocol layer than the layer of the ARQ retransmission functionality;
the low-level control signal comprising a link quality indicator and the included information comprising link quality information;deciding whether a retransmission of the PDU is to take place based on information included in the low-level control signal; determining the amount of retransmission data based on the link quality information.
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11. A method for reducing retransmission delays in a wireless communication system with Automatic Repeat reQuest (ARQ) retransmission functionality, comprising:
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sending a protocol data unit (PDU) from a transmitting side towards a receiving side; monitoring, at the transmitting side, a low-level control signal from the receiving side, the low-level control signal being associated with a lower protocol layer than the layer of the ARQ retransmission functionality; and deciding whether a retransmission of the PDU is to take place based on information included in the low-level control signal; in an uplink scenario comprising; sending the PDU from a terminal on the transmitting side towards a first communication node on the receiving side, said first communication node including ARQ functionality; monitoring, at the terminal, the low-level control signal from a second communication node on the receiving side; and deciding, at the terminal, whether a retransmission of the PDU is to take place based on the low-level control signal. - View Dependent Claims (12, 13)
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14. A method for reducing retransmission delays in a wireless communication system with Automatic Repeat reQuest (ARQ) retransmission functionality, comprising:
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sending a protocol data unit (PDU) from a transmitting side towards a receiving side; monitoring, at the transmitting side, a low-level control signal from the receiving side, the low-level control signal being associated with a lower protocol layer than the layer of the ARQ retransmission functionality; and deciding whether a retransmission of the PDU is to take place based on information included in the low-level control signal; in a downlink scenario, comprising; sending the PDU from a first communication node on the transmitting side towards a terminal on the receiving side said first communication node including ARQ functionality; monitoring, at a second communication node on the transmitting side, the low-level control signal from the terminal; communicating a recommendation on retransmission of the PDU together with an identifier for the PDU from the second communication node to the first communication node; and deciding, at the first communication node, whether a retransmission is to take place based on the retransmission recommendation. - View Dependent Claims (15, 16)
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17. A wireless communication system with ARQ retransmission functionality and means for reducing retransmission delays, comprising:
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means for sending a PDU from a transmitting side towards a receiving side; means for monitoring, at the transmitting side, a low-level control signal from the receiving side, the low-level control signal being associated with a lower protocol layer than the layer of the ARQ retransmission functionality; means for deciding whether a retransmission is to take place based on information included in the low-level control signal; and means for retransmitting the PDU from the transmitting side towards the receiving side in accordance with the decision by the deciding means and without having received an ARQ response message. - View Dependent Claims (18, 19, 20, 21)
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22. A wireless communication system with ARQ retransmission functionality and means for reducing retransmission delays, comprising:
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means for sending a PDU from a transmitting side towards a receiving side; means for monitoring, at the transmitting side, a low-level control signal from the receiving side, the low-level control signal being associated with a lower protocol layer than the layer of the ARQ retransmission functionality; means for deciding whether a retransmission is to take place based on information included in the low-level control signal; means for sending the PDU from a terminal on the transmitting side towards a first communication node on the receiving side, said first communication node including ARQ functionality; means for monitoring, at the terminal, the low-level control signal from a second communication node on the receiving side; and means for deciding, at the terminal, whether a retransmission of the PDU is to take place based on the low-level control signal.
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23. A wireless communication system with ARQ retransmission functionality and means for reducing retransmission delays, comprising:
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means for sending a PDU from a transmitting side towards a receiving side; means for monitoring, at the transmitting side, a low-level control signal from the receiving side, the low-level control signal being associated with a lower protocol layer than the layer of the ARQ retransmission functionality; means for deciding whether a retransmission is to take place based on information included in the low-level control signal; means for sending the PDU from a first communication node on the transmitting side towards a terminal on the receiving side said first communication node including ARQ functionality; means for monitoring, at a second communication node on the transmitting side, the low-level control signal from the terminal; means for communicating a recommendation on retransmission of the PDU together with an identifier for the PDU from the second communication node to the first communication node; and means for deciding, at the first communication node, whether retransmission is to take place based on the retransmission recommendation.
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24. A communication unit with means for reducing retransmission delays arranged at a transmitting side in a wireless communication system with ARQ retransmission functionality, comprising:
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means for monitoring a low-level control signal from a receiving side upon transmission of a PDU from the transmitting side towards the receiving side, the low-level control signal being associated with a lower protocol layer than the layer of the ARQ retransmission functionality; and means for performing a retransmission decision based on information included in the low-level control signal; means for sending the PDU towards the receiving side; means for deciding whether a retransmission is to take place based on the low-level control signal; and means for retransmitting the PDU towards the receiving side in accordance with the decision by the deciding means and without having received an ARQ response message for the PDU. - View Dependent Claims (25, 26, 27, 28)
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29. A communication unit with means for reducing retransmission delays arranged at a transmitting side in a wireless communication system with ARQ retransmission functionality, comprising:
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means for monitoring a low-level control signal from a receiving side upon transmission of a PDU from the transmitting side towards the receiving side, the low-level control signal being associated with a lower protocol layer than the layer of the ARQ retransmission functionality; means for performing a retransmission decision based on information included in the low-level control signal; means for deciding whether a retransmission is to be recommended based on the low-level control signal; and means for communicating a recommendation on retransmission of the PDU together with an identifier for the PDU to another communication unit at the transmitting side, the other communication unit including ARQ retransmission functionality.
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30. A communication unit with means for reducing retransmission delays arranged at a transmitting side in a wireless communication system with ARQ retransmission functionality, comprising:
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means for monitoring a low-level control signal from a receiving side upon transmission of a PDU from the transmitting side towards the receiving side, the low-level control signal being associated with a lower protocol layer than the layer of the ARQ retransmission functionality, the low-level control signal comprising a link quality indicator and the included information comprising link quality information; means for performing a retransmission decision based on information included in the low-level control signal; and means for determining the amount of retransmission data based the link quality information.
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Specification