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US 9,871,668 B2Granted
Method and apparatus for performing HARQ operation in wireless communication system
AssigneeLG Electronics Inc.
InventorHeejeong Cho
Life of this patent
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Abstract
A method and apparatus for transmitting feedback information in a device-to-device (D2D) communication system is provided. A cluster head is determined among a plurality of user equipment (UE) belong to a cluster, the cluster head transmits a notification to other UEs belong to the cluster, determines whether or not multicast data is successfully received by the other UEs, and transmits feedback information to the network.
Claims12
A method for transmitting feedback information in a device-to-device (D2D) communication system, the method comprising:
- receiving, by a cluster head, multicast data from a network,
- wherein the cluster head is selected among a plurality of user equipment (UE) belonging to a cluster,
- wherein the cluster head is selected by a ranking number of each of the plurality of UE belonging to the cluster,
- wherein the ranking number is determined by a capacity of a processor installed within the UE or a location of the UE, and
- wherein the multicast data is also transmitted from the network to other UEs belonging to the cluster;
- transmitting, by the cluster head, a notification to the other UEs belonging to the cluster whether or not the multicast data is successfully received by the cluster head,
- wherein the notification is transmitted through a device-to-device (D2D) link;
- determining whether or not the multicast data is successfully received by the other UEs belonging to the cluster;
- and
- transmitting the feedback information to the network based on the determining,
- wherein the feedback information is at least a positive acknowledgment (ACK) message or a negative acknowledgment (NACK) message,
- wherein the ACK message is transmitted to the network by a UE other than the cluster head if it is determined that the cluster head does not successfully receive the multicast data but at least other UEs successfully receive the multicast data, and
- wherein the UE other than the cluster head has a highest ranking number among the UEs that successfully receive the multicast data.
10 more elements
An apparatus for transmitting feedback information in a device-to-device (D2D) communication system, the apparatus comprising:
- a radio frequency (RF) unit for transmitting or receiving data;
- and
- a processor, operatively coupled to the RF unit, and configured for:
- receiving multicast data from a network,
- wherein a cluster head is selected among a plurality of user equipment (UE) belonging to a cluster,
- wherein the cluster head is selected by a ranking number of each of the plurality of UE belonging to the cluster,
- wherein the ranking number is determined by a capacity of a processor installed within the UE or a location of the UE, and
- wherein the multicast data is also transmitted from the network to other UEs belonging to the cluster;
- transmitting a notification to the other UEs belonging to the cluster whether or not the multicast data is successfully received by the cluster head,
- wherein the notification is transmitted through a device-to-device (D2D) link;
- determining whether or not the multicast data is successfully received by the other UEs belonging to the cluster;
- and
- transmitting the feedback information to the network based on the determining,
- wherein the feedback information is at least a positive acknowledgment (ACK) message or a negative acknowledgment (NACK) message,
- wherein the ACK message is transmitted to the network by a UE other than the cluster head if it is determined that the cluster head does not successfully receive the multicast data but at least other UEs successfully receive the multicast data, and
- wherein the UE other than the cluster head has a highest ranking number among the UEs that successfully receive the multicast data.
13 more elements
Dependencies are inferred from the claim text.