Method and apparatus for transmitting interference information
A method for receiving, by a UE, information for interference cancellation, the method includes receiving assistance control information for removing interference data from a neighboring eNB; and receiving primary control information indicating the interference data using the assistance control information, the assistance control information includes at least one of control channel element (CCE) indices, an aggregation level and a downlink control information (DCI) format of a control channel on which the primary control information is transmitted and cyclic redundancy check (CRC) bits for the control channel, the assistance control information includes sub-assistance control information on neighboring UEs simultaneously scheduled by the neighboring eNB.
1. A method for receiving, by a user equipment (UE), information for interference cancellation, the method comprising:
receiving assistance control information for removing interference data from a neighboring evolved-NodeB (eNB); and
receiving primary control information indicating the interference data using the assistance control information,
wherein the assistance control information includes at least one of control channel element (CCE) indices, an aggregation level and a downlink control information (DCI) format of a control channel on which the primary control information is transmitted and cyclic redundancy check (CRC) bits for the control channel,
wherein the assistance control information includes sub-assistance control information on neighboring UEs simultaneously scheduled by the neighboring eNB, and
wherein the assistance control information is received at the CCE index following the last CCE index at which control information indicating data for the UE is received.
2. The method according to claim 1 , further comprising receiving the assistance control information in a search space determined based on a dedicated RNTI for the assistance control information.
3. The method according to claim 2 , wherein the dedicated RNTI is received through a higher layer signal.
4. The method according to claim 1 , further comprising:
detecting the interference data from the neighboring eNB using the received primary control information; and
removing the detected interference data from total received data.
5. The method according to claim 1 , further comprising:
receiving information on an aggregation level for the assistance control information through a higher layer signal,
wherein the aggregation level of an assistance control channel on which the assistance control information is transmitted is limited to part of all aggregation levels available for control channels.
6. The method according to claim 1 , wherein, when the assistance control information includes a plurality of sub-assistance control informations respectively configured for each of a plurality of neighboring UEs simultaneously scheduled by the neighboring eNB, a flag bit field for indicating whether a subsequent sub-assistance control information follows is added to each of back end of the plurality of the sub-assistance control information.
7. The method according to claim 1 , wherein the assistance control information is included in control information indicating data for the UE and received from a serving eNB of the UE.
8. The method according to claim 1 , wherein the assistance control information is received from the neighboring eNB.
9. The method according to claim 1 , wherein, when the assistance control information is received on an enhanced physical downlink control channel (EPDCCH), an EPDCCH physical resource block (PRB) set for the assistance control information is configured independently of an EPDCCH PRB set for control information indicating data for the UE.
10. A method for transmitting, by an evolved-NodeB (eNB), information for interference cancellation of a user equipment (UE) (referred to as a neighboring UE) served by a neighboring eNB, the method comprising:
transmitting primary control information indicating data for at least one serving UE; and
transmitting assistance control information for interference cancellation,
wherein the assistance control information includes at least one of CCE indices, an aggregation level and a DCI format of a control channel on which the primary control information is transmitted and CRC bits for the control channel,
wherein the assistance control information includes sub-assistance control information on neighboring UEs simultaneously scheduled by the eNB, and
wherein the assistance control information is transmitted at the CCE index following the last CCE index at which control information indicating data for the UE is received.
11. The method according to claim 10 , further comprising transmitting the assistance control information in a search space determined based on a dedicated RNTI for the assistance control information.
12. The method according to claim 10 , further comprising:
transmitting information on an aggregation level for the assistance control information,
wherein the aggregation level of an assistance control channel on which the assistance control information is transmitted is limited to part of all aggregation levels available for control channels.
13. The method according to claim 10 , wherein, when the assistance control information includes a plurality of sub-assistance control informations respectively configured for each of a plurality of neighboring UEs simultaneously scheduled by the eNB, a flag bit field for indicating whether a subsequent sub-assistance control information follows is added to each of back end of the plurality of the sub-assistance control information.
14. The method according to claim 10 , wherein, when the assistance control information is transmitted on an EPDCCH, an EPDCCH PRB set for the assistance control information is configured independently of an EPDCCH PRB set for control information indicating data for the UE.
15. A user equipment (UE) configured to receive information for interference cancellation, comprising:
a radio frequency (RF) unit; and
a processor configured to:
receive assistance control information for removing interference data from a neighboring evolved-NodeB (eNB); and
receive primary control information indicating the interference data using the assistance control information,
wherein the assistance control information includes at least one of CCE indices, an aggregation level and a DCI format of a control channel on which the primary control information is transmitted and CRC bits for the control channel,
wherein the assistance control information includes sub-assistance control information on neighboring UEs simultaneously scheduled by the neighboring eNB, and
wherein the assistance control information is received at the CCE index following the last CCE index at which control information indicating data for the UE is received.
16. An evolved-NodeB (eNB) configured to transmit information for interference cancellation of a user equipment (UE) (referred to as a neighboring UE) served by a neighboring eNB, comprising:
an RF unit; and
a processor:
transmit primary control information indicating data for at least one serving UE; and
transmit assistance control information for interference cancellation,
wherein the assistance control information includes at least one of CCE indices, an aggregation level and a DCI format of a control channel on which the primary control information is transmitted and CRC bits regarding the control channel,
wherein the assistance control information includes sub-assistance control information about neighboring UEs simultaneously scheduled by the eNB, and
wherein the assistance control information is transmitted at the CCE index following the last CCE index at which control information indicating data for the UE is received.