Arq system with status and packet acknowledgement
First Claim
1. A communication system having a downlink indicator channel (DL1) for the transmission of an indicator signal (302) indicating that a data packet is (202) scheduled to be transmitted on a downlink data channel (DL2) from a primary station (100) to a secondary station (110), the secondary station having receiving means (114) for receiving the indicator signal and the data packet, and acknowledgement means (114) for transmitting a signal (206) to the primary station to indicate the status of the received data packet, wherein the secondary station comprises means (114) for transmitting on an uplink channel (UL) a status signal (204) to indicate receipt of the indicator signal before transmission of a positive or negative acknowledgement (206) to indicate the status of the received data packet.
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Accused Products
Abstract
A communication system comprises a downlink indicator channel (DL1) for the transmission of a indicator signal (302) indicating that a data packet (202) is scheduled to be transmitted on a downlink data channel (DL2) from a primary station to a secondary station. In operation, on detection of the indicator signal, the secondary station transmits a status signal, for example a negative acknowledgement signal (204), on an uplink channel (UL) to the primary station immediately before transmission of a positive (206) or negative acknowledgement signal to indicate the status of the received data packet. By providing the primary station with two chances to detect the case where the secondary station fails to detect the indicator signal, peak power requirements of the uplink channel can be reduced, thereby reducing system interference levels.
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Citations
14 Claims
- 1. A communication system having a downlink indicator channel (DL1) for the transmission of an indicator signal (302) indicating that a data packet is (202) scheduled to be transmitted on a downlink data channel (DL2) from a primary station (100) to a secondary station (110), the secondary station having receiving means (114) for receiving the indicator signal and the data packet, and acknowledgement means (114) for transmitting a signal (206) to the primary station to indicate the status of the received data packet, wherein the secondary station comprises means (114) for transmitting on an uplink channel (UL) a status signal (204) to indicate receipt of the indicator signal before transmission of a positive or negative acknowledgement (206) to indicate the status of the received data packet.
- 3. A primary station (100) for use in a communication system having a downlink indicator channel (DL1) for the transmission of an indicator signal (302) indicating that a data packet (202) is scheduled to be transmitted on a downlink data channel (DL2) from the primary station to a secondary station (110), wherein means (104) are provided for receiving on an uplink channel (UL) a status signal (204) from the secondary station to indicate receipt of the indicator signal before reception of a positive or negative acknowledgement (206) to indicate the status of the data packet received by the secondary station.
- 5. A secondary station for use in a communication system having a downlink indicator channel (DL1) for the transmission of an indicator signal (302) indicating that a data packet (202) is scheduled to be transmitted on a downlink data channel (DL2) from a primary station (100) to the secondary station (110), wherein receiving means (114) are provided for receiving the indicator signal and the data packet, acknowledgement means (114) are provided for transmitting on an uplink channel (UL) a signal (206) to the primary station to indicate the status of the received data packet, and means (114) are provided for transmitting a status signal (204) to indicate receipt of the indicator signal before transmission of a positive or negative acknowledgement to indicate the status of the received data packet.
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14. A method of operating a communication system having a downlink indicator channel (DL,) for the transmission of an indicator signal (302) indicating that a data packet (202) is scheduled to be transmitted on a downlink data channel (DL2) from a primary station (100) to a secondary station (110), the method comprising the secondary station receiving the indicator signal and the data packet, and transmitting (806) on an uplink channel (UL) a status signal (204) to indicate receipt of the indicator signal before transmission (810, 816) of a positive or negative acknowledgement to indicate the status of the received data packet.
Specification