TRANSMISSION CONTROL IN A WIRELESS COMMUNICATION SYSTEM
First Claim
1. A method for performing transmission control in a communication system that includes a control terminal (CT), a relay apparatus (RA), and a plurality user equipment (UE) that wirelessly communicate with the CT through the RA, the method comprising the steps of:
- the CT receiving an RA-CT downlink signal that originated from a UE;
the CT determining a frequency-of-arrival (FoA) error from the RA-CT downlink signal, wherein the FoA error results at least in part from an error in a UE time reference with respect to a CT time reference;
the CT providing, to the UE, a transmit frequency control (TFC) feedback signal that indicates the error in the UE time reference;
the UE receiving the TFC feedback signal, and producing an adjusted UE uplink carrier frequency signal that compensates for the error in the UE time reference as indicated in the TFC feedback signal; and
the UE upconverting and transmitting a UE-RA uplink signal using the adjusted UE uplink carrier frequency signal.
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Accused Products
Abstract
In a communication system that includes a control terminal (CT), a relay apparatus (RA), and a plurality user equipment (UE) that wirelessly communicate with the CT through the RA, a method for performing transmission control includes the CT receiving an RA-CT downlink signal that originated from a UE, determining a frequency-of-arrival (FoA) error from the RA-CT downlink signal (where the FoA error results at least in part from an error in a UE time reference with respect to a CT time reference), and providing, to the UE, a transmit frequency control (TFC) feedback signal that indicates the error in the UE time reference. The UE produces an adjusted UE uplink carrier frequency signal that compensates for the error in the UE time reference as indicated in the TFC feedback signal, and upconverts and transmits a UE-RA uplink signal using the adjusted UE uplink carrier frequency signal.
33 Citations
25 Claims
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1. A method for performing transmission control in a communication system that includes a control terminal (CT), a relay apparatus (RA), and a plurality user equipment (UE) that wirelessly communicate with the CT through the RA, the method comprising the steps of:
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the CT receiving an RA-CT downlink signal that originated from a UE; the CT determining a frequency-of-arrival (FoA) error from the RA-CT downlink signal, wherein the FoA error results at least in part from an error in a UE time reference with respect to a CT time reference; the CT providing, to the UE, a transmit frequency control (TFC) feedback signal that indicates the error in the UE time reference; the UE receiving the TFC feedback signal, and producing an adjusted UE uplink carrier frequency signal that compensates for the error in the UE time reference as indicated in the TFC feedback signal; and the UE upconverting and transmitting a UE-RA uplink signal using the adjusted UE uplink carrier frequency signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for performing transmission control in a communication system that includes a control terminal (CT), a relay apparatus (RA), and a plurality user equipment (UE) that wirelessly communicate with the CT through the RA, the method performed by a UE and comprising the steps of:
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receiving a transmit frequency control (TFC) feedback signal from the CT, wherein the TFC feedback signal indicates an error in a UE time reference with respect to a CT time reference; producing an adjusted UE uplink carrier frequency signal that compensates for the error in the UE time reference as indicated in the TFC feedback signal; and upconverting and transmitting a UE-RA uplink signal using the adjusted UE uplink carrier frequency signal. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A method for performing transmission control in a communication system that includes a control terminal (CT), a relay apparatus (RA), and a plurality user equipment (UE) that wirelessly communicate with the CT through the RA, the method performed by a CT and comprising the steps of:
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receiving an RA-CT downlink signal that originated from a UE; determining a frequency-of-arrival (FoA) error from the RA-CT downlink signal, wherein the FoA error results at least in part from an error in a UE time reference with respect to a CT time reference; and providing, to the UE, a transmit frequency control (TFC) feedback signal that indicates the error in the UE time reference, in order to enable the UE to produce an adjusted UE uplink carrier frequency signal that compensates for the error in the UE time reference as indicated in the TFC feedback signal. - View Dependent Claims (20, 21)
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22. A system comprising:
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a relay apparatus (RA) adapted to exchange radio frequency (RF) signals between a control terminal (CT) and a user equipment (UE); the CT adapted to receive an RA-CT downlink signal that originated from the UE, determine a frequency-of-arrival (FoA) error from the RA-CT downlink signal, wherein the FoA error results at least in part from an error in a UE time reference with respect to a CT time reference, and provide, to the UE, a transmit frequency control (TFC) feedback signal that indicates the error in the UE time reference; and the UE adapted to receive the TFC feedback signal, produce an adjusted UE uplink carrier frequency signal that compensates for the error in the UE time reference as indicated in the TFC feedback signal, and upconvert and transmit a UE-RA uplink signal using the adjusted UE uplink carrier frequency signal. - View Dependent Claims (23, 24, 25)
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Specification