Channel structure for discovering terminal in wireless communication system, and power control method and apparatus
The present disclosure provides a method for performing a cellular communication in a device-to-device communication system, the method comprising the operations of: receiving scheduling to transmit an uplink signal through a specific resource of a discovery channel from a base station; generating uplink scheduling information notifying scheduling of the uplink signal; and transmitting the uplink scheduling information through at least one discovery resource of the discovery channel.
1. A method for supporting device-to-device communication by a user equipment having a cellular communication function, the method comprising:
receiving, from a base station, a schedule for an uplink control signal;
generating uplink scheduling information related to a subframe in which a transmission of the uplink control signal is scheduled; and
transmitting the uplink scheduling information through one or more uplink scheduling resource blocks positioned in a central portion of a frequency band allocated to a discovery channel for device-to-device communication, based on mapping relations between a position of resource blocks in which a transmission of the uplink control signal is scheduled and the one or more uplink scheduling resource blocks.
2. The method according to claim 1 , wherein the one or more uplink scheduling resource blocks are mapped to a specific resource through which the uplink control signal is transmitted.
3. The method according to claim 2 , wherein one uplink scheduling resource block is mapped with two or more resource blocks in the subframe in which a transmission of the uplink control signal is scheduled.
4. The method according to claim 1 , wherein the one or more uplink scheduling resource blocks are determined based on a scheduling period of the uplink control signal.
5. The method according to claim 1 , wherein the uplink scheduling information comprises a reference signal indicating a specific position of one or more resource blocks in the subframe in which a transmission of the uplink control signal is scheduled.
6. The method according to claim 5 , wherein the reference signal is mapped to a orthogonal frequency division multiplex (OFDM) symbol corresponding a position of one or more resource blocks in the subframe in which a transmission of the uplink control signal is scheduled, from among a plurality of OFDM symbols included in the one or more uplink scheduling resource blocks.
7. The method according to claim 1 , wherein the uplink scheduling information is transmitted through the one or more uplink scheduling resource blocks in a subframe just before the subframe in which a transmission of the uplink control signal is scheduled.
8. The method according to claim 1 , wherein the uplink scheduling information comprises position information indicating a specific position of one or more resource blocks through which the uplink control signal is transmitted.
9. A method for transmitting a discovery signal by a user equipment having a device-to-device communication function, the method comprising:
receiving, from a cellular user equipment, uplink scheduling information relating to a subframe in which a transmission of an uplink control signal for the cellular user equipment is scheduled, through one or more uplink scheduling resource blocks positioned in a central portion of a frequency band allocated to a discovery channel for device-to-device communication;
performing power control for the discovery signal that is transmitted in the subframe in which a transmission of the uplink control signal is scheduled, according to the uplink scheduling information; and
transmitting the power controlled discovery signal in the subframe in which a transmission of the uplink control signal is scheduled,
wherein the discovery signal is transmitted without power control in remaining subframe in which a transmission of a uplink control signal for at least one cellular user equipment has not been scheduled, and
wherein the uplink scheduling information is received based on mapping relations between a position of resource blocks in which a transmission of the uplink control signal is scheduled and the one or more uplink scheduling resource blocks.
10. The method according to claim 9 , wherein the discovery signal is transmitted with power control in a first subframe of the discovery channel.
11. The method according to claim 9 , wherein, the discovery signal is transmitted without power control in the subframe in which a transmission of the uplink control signal is scheduled, when a discovery resource in which the discovery signal is transmitted, is within a predetermined range from a central portion of the discovery channel.
12. A user equipment device having a cellular communication function, for supporting device-to-device communication, the user equipment device comprising:
a transceiver configured to receive, from a base station, a schedule for an uplink control signal; and
a processor configured to:
generate uplink scheduling information related to a subframe in which a transmission of the uplink control signal is scheduled; and
control the transceiver to transmit the uplink scheduling information through one or more uplink scheduling resource blocks positioned in a central of a frequency band allocated to a discovery channel for device-to-device communication, based on mapping relations between a position of resource blocks in which a transmission of the uplink control signal is scheduled and the one or more uplink scheduling resource blocks.
13. The user equipment device according to claim 12 , wherein the the one or more uplink scheduling resource blocks are mapped to a specific resource through which the uplink control signal is transmitted.
14. The user equipment device according to claim 13 , wherein one uplink scheduling resource block is mapped with two or more resource blocks in the subframe in which a transmission of the uplink control signal is scheduled.
15. The user equipment device according to claim 12 , wherein the one or more uplink scheduling resource blocks are determined based on a scheduling period of the uplink control signal.
16. The user equipment device according to claim 12 , wherein the uplink scheduling information comprises a reference signal indicating a specific position of one or more resource blocks in the subframe in which a transmission of the uplink control signal is scheduled.
17. The user equipment device according to claim 16 , wherein the reference signal is mapped to a orthogonal frequency division multiplex (OFDM) symbol corresponding a position of one or more resource blocks in the subframe in which a transmission of the uplink control signal is scheduled, from among a plurality of OFDM symbols included in the one or more uplink scheduling resource blocks.
18. The user equipment device according to claim 12 , wherein the uplink scheduling information is transmitted through the one or more uplink scheduling resource blocks in a subframe just before the subframe in which a transmission of the uplink control signal is to be scheduled.
19. The user equipment device according to claim 12 , wherein the uplink scheduling information comprises position information indicating a specific position of one or more resource blocks through which the uplink control signal is transmitted.
20. A user equipment device having a device-to-device communication function, for transmitting a discovery signal, the user equipment device comprising:
a transceiver configured to receive, from a cellular user equipment, uplink scheduling information relating to a subframe in which a transmission of an uplink control signal for the cellular user equipment is scheduled, through one or more uplink scheduling resource blocks positioned in a central portion of a frequency band allocated to a discovery channel for device-to-device communication; and
a processor configured to:
perform power control for the discovery signal that is transmitted in the subframe in which a transmission of the uplink control signal is scheduled, according to the uplink scheduling information, and
control the transceiver to transmit the power controlled discovery signal in the subframe in which a transmission of the uplink control signal is scheduled,
wherein the discovery signal is transmitted without power control in remaining subframe in which a transmission of a uplink control signal for at least one cellular user equipment has not been scheduled, and
wherein the uplink scheduling information is received based on mapping relations between a position of resource blocks in which a transmission of the uplink control signal is scheduled and the one or more uplink scheduling resource blocks.
21. The user equipment device according to claim 20 , wherein the discovery signal is transmitted with power control in a first subframe of the discovery channel.
22. The user equipment device according to claim 20 , wherein the discovery signal is transmitted without power control in the subframe in which a transmission of the uplink control signal is scheduled, when a discovery resource in which the discovery signal is transmitted, is within a predetermined range from a central portion of the discovery channel.