Method for performing hybrid automatic repeat request, and base station and mobile device using the same
First Claim
1. A method for performing hybrid automatic repeat request (HARQ), adapted to a base station in a wireless communication system, the method comprising:
- allocating a wireless resource by using the base station, and determining whether to perform a device-to-device (D2D) communication;
when the D2D communication is performed, transmitting a first resource allocation message to a first mobile device and a second mobile device by using the base station, so that the first mobile device, which works as a transmitter, transmits a data packet to the second mobile device, which works as a receiver, according to the first resource allocation message;
receiving a HARQ feedback packet from the second mobile device by using the base station to determine whether the data packet is successfully transmitted; and
when the HARQ feedback packet is a negative acknowledgement (NACK), transmitting a second resource allocation message to the first mobile device and the second mobile device by using the base station,wherein when the HARQ feedback packet is the NACK and an asynchronous HARQ retransmission is performed, the second resource allocation message is simultaneously transmitted to the first mobile device and the second mobile device by using the base station, so that the first mobile device retransmits the data packet to the second mobile device according to the second resource allocation message.
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Accused Products
Abstract
A method for performing hybrid automatic repeat request (HARQ), a base station (BS), and a mobile device are provided. In the method, a wireless resource is allocated by the BS, and whether to perform a device-to-device (D2D) communication is determined. When the D2D communication is performed, a first resource allocation message is transmitted by the BS to a first mobile device and a second mobile device, and the first mobile device, working as a transmitter, transmits a data packet to the second mobile device, working as a receiver, according to the first resource allocation message. A HARQ feedback packet is received by the BS from the second mobile device to determine whether the data packet is successfully transmitted. When the HARQ feedback packet is a negative acknowledgement (NACK), the BS retains the original wireless resource or transmits a second resource allocation message to the first and the second mobile devices.
24 Citations
35 Claims
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1. A method for performing hybrid automatic repeat request (HARQ), adapted to a base station in a wireless communication system, the method comprising:
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allocating a wireless resource by using the base station, and determining whether to perform a device-to-device (D2D) communication; when the D2D communication is performed, transmitting a first resource allocation message to a first mobile device and a second mobile device by using the base station, so that the first mobile device, which works as a transmitter, transmits a data packet to the second mobile device, which works as a receiver, according to the first resource allocation message; receiving a HARQ feedback packet from the second mobile device by using the base station to determine whether the data packet is successfully transmitted; and when the HARQ feedback packet is a negative acknowledgement (NACK), transmitting a second resource allocation message to the first mobile device and the second mobile device by using the base station, wherein when the HARQ feedback packet is the NACK and an asynchronous HARQ retransmission is performed, the second resource allocation message is simultaneously transmitted to the first mobile device and the second mobile device by using the base station, so that the first mobile device retransmits the data packet to the second mobile device according to the second resource allocation message. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A base station, comprising:
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a transceiver, configured to transmit and receive wireless signals; and a processor, coupled to the transceiver, and configured to execute following operations; allocating a wireless resource used by at least one mobile device; when a device-to-device (D2D) communication is performed, transmitting a first resource allocation message to a first mobile device and a second mobile device, so that the first mobile device, which works as a transmitter, transmits a data packet to the second mobile device, which works as a receiver, according to the first resource allocation message; receiving a hybrid automatic repeat request (HARQ) feedback packet from the second mobile device to deter mine whether the data packet is successfully transmitted; and when the HARQ feedback packet is a negative acknowledgement (NACK), transmitting a second resource allocation message to the first mobile device and the second mobile device, wherein when the HARQ feedback packet is the NACK and an asynchronous HARQ retransmission is performed, the processor is configured to simultaneously transmit the second resource allocation message to the first mobile device and the second mobile device, so that the first mobile device retransmits the data packet to the second mobile device according to the second resource allocation message. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for performing hybrid automatic repeat request (HARQ), adapted to a first mobile device and a second mobile device that perform a device-to-device (D2D) communication in a wireless communication system, the method comprising:
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monitoring a first resource allocation message from a base station by using the first mobile device and the second mobile device to determine whether to perform the D2D communication; when the D2D communication is performed, transmitting a data packet by using the first mobile device, which is instructed to work as a transmitter, to the second mobile device, which is instructed to work as a receiver, according to a wireless resource allocated in the first resource allocation message; and transmitting a HARQ feedback packet to the base station by using the second mobile device to respond that whether the data packet is successfully received, wherein when the HARQ feedback packet is a negative acknowledgement (NACK), performing an asynchronous HARQ retransmission by using the first mobile device and the second mobile device, wherein when the first mobile device and the second mobile device perform the asynchronous HARQ retransmission, the method further comprises; not expecting to receive the HARQ feedback packet and directly monitoring a physical downlink control channel (PDCCH) by using the first mobile device; transmitting the HARQ feedback packet to the base station and then continuously monitoring the PDCCH by using the second mobile device; and when the first mobile device and the second mobile device receive a second resource allocation message from the base station, retransmitting the data packet to the second mobile device by using the first mobile device according to a new wireless resource allocated in the second resource allocation message. - View Dependent Claims (19, 20, 21)
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22. A mobile device, comprising:
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a transceiver, configured to transmit and receive wireless signals; and a processor, coupled to the transceiver, and configured to execute following operations; receiving a first resource allocation message from a base station to determine whether to perform a device-to-device (D2D) communication; when the first resource allocation message instructs to perform the D2D communication as a transmitter, transmitting a data packet to another mobile device according to a wireless resource allocated in the first resource allocation message; and when the first resource allocation message instructs to perform the D2D communication as a receiver, receiving the data packet from the other mobile device according to the wireless resource allocated in the first resource allocation message, and transmitting a hybrid automatic repeat request (HARQ) feedback packet to the base station to respond that whether the data packet is successfully received, wherein when the HARQ feedback packet is a negative acknowledgement (NACK), the processor is further configured to perform an asynchronous HARQ retransmission, wherein when the mobile device works as the transmitter and performs the asynchronous HARQ retransmission, the processor is configured to; directly monitoring a physical downlink control channel (PDCCH), and receiving a second resource allocation message from the base station through the transceiver; and retransmitting the data packet to the other mobile device according to a new wireless resource allocated in the second resource allocation message. - View Dependent Claims (23, 24, 25, 26, 27, 28)
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29. A method for performing hybrid automatic repeat request (HARQ), adapted to a base station in a wireless communication system, the method comprising:
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allocating a wireless resource by using the base station, and determining whether to perform a device-to-device (D2D) communication; when the D2D communication is performed, transmitting a first resource allocation message to a first mobile device and a second mobile device by using the base station, so that the first mobile device, which works as a transmitter, transmits a data packet to the second mobile device, which works as a receiver, according to the first resource allocation message; receiving a HARQ feedback packet from the second mobile device by using the base station to determine whether the data packet is successfully transmitted; and when the HARQ feedback packet is a negative acknowledgement (NACK), retaining the wireless resource allocated in the first resource allocation message by using the base station, wherein when the HARQ feedback packet is the NACK and an synchronous HARQ retransmission is performed, the HARQ feedback packet is not transmitted to the first mobile device by using the base station and the wireless resource allocated in the first resource allocation message is retained by using the base station, so that the first mobile device automatically retransmits the data packet at a predefined timing to the second mobile device.
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30. A base station, comprising:
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a transceiver, configured to transmit and receive wireless signals; and a processor, coupled to the transceiver, and configured to execute following operations; allocating a wireless resource used by at least one mobile device; when a device-to-device (D2D) communication is performed, transmitting a first resource allocation message to a first mobile device and a second mobile device, so that the first mobile device, which works as a transmitter, transmits a data packet to the second mobile device, which works as a receiver, according to the first resource allocation message; receiving a hybrid automatic repeat request (HARQ) feedback packet from the second mobile device to determine whether the data packet is successfully transmitted; and when the HARQ feedback packet is a negative acknowledgement (NACK), retaining the wireless resource allocated in the first resource allocation message, wherein when the HARQ feedback packet is the NACK and an synchronous HARQ retransmission is performed, the processor is configured to not to transmit the HARQ feedback packet to the first mobile device and to retain the wireless resource allocated in the first resource allocation message, so that the first mobile device automatically retransmits the data packet at a predefined timing to the second mobile device.
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31. A method for performing hybrid automatic repeat request (HARQ), adapted to a first mobile device and a second mobile device that perform a device-to-device (D2D) communication in a wireless communication system, the method comprising:
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monitoring a first resource allocation message from a base station by using the first mobile device and the second mobile device to determine whether to perform the D2D communication; when the D2D communication is performed, transmitting a data packet by using the first mobile device, which is instructed to work as a transmitter, to the second mobile device, which is instructed to work as a receiver, according to a wireless resource allocated in the first resource allocation message; and transmitting a HARQ feedback packet to the base station by using the second mobile device to respond that whether the data packet is successfully received, wherein when the HARQ feedback packet is a negative acknowledgement (NACK), performing an synchronous HARQ retransmission by using the first mobile device and the second mobile device, wherein when the first mobile device and the second mobile device perform the synchronous HARQ retransmission, the method further comprising; automatically receiving the HARQ feedback packet transmitted by the second mobile device to the base station through a PUCCH by using the first mobile device; when the HARQ feedback packet is the NACK, automatically retransmitting the data packet to the second mobile device according to the wireless resource allocated in the first resource allocation message by using the first mobile device; and automatically receiving the data packet again according to the wireless resource allocated in the first resource allocation message by using the second mobile device. - View Dependent Claims (32)
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33. A mobile device, comprising:
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a transceiver, configured to transmit and receive wireless signals; and a processor, coupled to the transceiver, and configured to execute following operations; receiving a first resource allocation message from a base station to determine whether to perform a device-to-device (D2D) communication; when the first resource allocation message instructs to perform the D2D communication as a transmitter, transmitting a data packet to another mobile device according to a wireless resource allocated in the first resource allocation message; and when the first resource allocation message instructs to perform the D2D communication as a receiver, receiving the data packet from the other mobile device according to the wireless resource allocated in the first resource allocation message, and transmitting a hybrid automatic repeat request (HARQ) feedback packet to the base station to respond that whether the data packet is successfully received, wherein when the HARQ feedback packet is a negative acknowledgement (NACK), the processor is further configured to perform an synchronous HARQ retransmission, wherein when the mobile device works as the transmitter and performs the synchronous HARQ retransmission, the processor is configured to; automatically receive the HARQ feedback packet transmitted by the other mobile device to the base station through a physical uplink control channel (PUCCH); and when the HARQ feedback packet is the NACK, automatically retransmit the data packet to the other mobile device according to the wireless resource allocated in the first resource allocation message. - View Dependent Claims (34, 35)
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Specification