Hybrid automatic repeat request and channel information feedback for relay
AssigneeLG Electronics Inc.
InventorsHak Seong Kim, Eun Sun Kim, Byeong Geol Cheon, Bong Hoe Kim
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Abstract
Operations of a relay are disclosed. To perform a hybrid automatic repeat request (HARQ), the relay receives a plurality of codewords from a base station and transmits a status indicator with respect to the plurality of codewords to the base station. The status indicator is a signal informing the base station about whether or not the configuration of an HARQ has been changed. Although a backhaul link and an access link are asymmetric, HARQ operation can be achieved.
Claims6
A hybrid automatic repeat request (HARQ) performing method of a relay, the method comprising:
- receiving a plurality of codewords from a base station (BS);
- transmitting a status indicator with respect to the plurality of codewords to the BS;
- relaying the plurality of codewords to a relay user equipment (Re UE);
- receiving at least one ACK/NACK (Acknowledgement/Not Acknowledgement) with respect to the plurality of codewords from the Re UE;
- and relaying the at least one ACK/NACK which has been received from the Re UE to the BS,
- wherein the status indicator is a signal informing the BS about whether or not the configuration of an HARQ has been changed.
A channel information feedback method of a relay, the method comprising:
- extracting channel information with respect to a backhaul downlink between a base station (BS) and a relay station (RS) by using a signal received from the BS;
- transmitting channel information regarding the backhaul downlink to a relay user equipment (Re UE) connected to the RS;
- receiving integrated channel information from the Re UE;
- and
- relaying the integrated channel information to the BS,
- wherein the integrated channel information is information obtained by estimating a channel between the BS and the Re UE based on the channel information regarding the backhaul downlink and channel information regarding an access downlink between the RS extracted by the re UE and the Re UE.
A channel information feedback method of a relay user equipment (Re UE), the method comprising:
- receiving channel information regarding a backhaul downlink between a base station (BS) and a relay station (RS) from the RS;
- determining integrated channel information obtained by estimating a channel between the BS and the RS based on the channel information regarding the backhaul downlink;
- and
- transmitting the integrated channel information to the RS.
Dependencies are inferred from the claim text.