RELAY COLLABORATIVE COMMUNICATION SYSTEM AND COMMUNICATION METHOD
First Claim
1. A communication method of a relay collaborative cellular communication system including a base station and at least one relay station, said communication method comprising the steps of:
- (a) causing the at least one relay station or the at least one relay station and the base station to measure a reception quality of an uplink signal transmitted from each user device;
(b) causing the at least one relay station to feed back a measured reception quality to the base station; and
(c) causing the base station to determine a transmission route between the each user device and the base station based on the reception quality.
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Accused Products
Abstract
The present invention provides a relay collaborative cellular mobile communication system and a communication method of the system. In the method, all relay stations or a base station and relay stations in a cell (i) measure all uplink signals such as uplink reference signals and random-access signals from user devices for obtaining reception qualities of uplink signals of the user devices at the sites and (ii) feed back measurement results to the base station. The base station determines a transmission route of a user device based on the measurement results. A site in a transmission route processes schedule control information and then transmits the information to the user device for performing, based on lumped scheduling of the base station, a downlink reception, an uplink transmission, an uplink retransmission, or a downlink retransmission. In an uplink HARQ mechanism, the site in the transmission route receives an uplink signal from the user device, feeds back an ACK to the user device, and transmits a processed uplink signal to the base station, or feeds back an NACK or an ACK to the base station. The base station judges, based on results of decoding and detecting transmitted data or feedback results from the sites in the transmission route, whether or not the current uplink transmission is successful or whether to adjust the uplink retransmission.
21 Citations
18 Claims
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1. A communication method of a relay collaborative cellular communication system including a base station and at least one relay station, said communication method comprising the steps of:
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(a) causing the at least one relay station or the at least one relay station and the base station to measure a reception quality of an uplink signal transmitted from each user device; (b) causing the at least one relay station to feed back a measured reception quality to the base station; and (c) causing the base station to determine a transmission route between the each user device and the base station based on the reception quality. - View Dependent Claims (2, 3, 4)
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5. A communication method of a relay collaborative cellular communication system including a base station and at least one relay station, said communication method comprising the steps of:
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(a) causing the base station to determine a route site for a user device based on a reception quality measured by (i) the base station and the at least one relay station or (ii) the at least one relay station; (b) causing the user device to transmit a signal with use of an uplink resource which is allocated to the user device; (c) causing the user device to carry out, based on lumped scheduling of the base station, a downlink reception, an uplink transmission, an uplink retransmission, or a downlink retransmission, and causing the route site to process schedule control information and to transmit the schedule control information to the user device; and (d) in an uplink hybrid automatic repeat request (HARQ) mechanism, causing the at least one relay station or the at least one relay station and the base station to feed back a confirmation of accurate reception to the user device, regardless of whether or not the at least one relay station or the at least one relay station and the base station successfully receive(s) an uplink signal transmitted from the user device. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A relay collaborative cellular communication system including a base station and at least one of relay station,
the at least one relay station including: -
a first receiving device which receives a first signal from a user device, a first measuring device which measures a first reception quality of the first signal, and a transmitting device which feeds back the first reception quality from the at least one relay station to the base station; and the base station including; a second receiving device which receives a second signal from the user device, a second measuring device which measures a second reception quality of the second signal, and a route determining device which determines a transmission route between the user device and the base station based on the first reception quality and the second reception quality. - View Dependent Claims (16, 17, 18)
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Specification