Method and apparatus for configuring frame of unlicensed band
A communication node configures an unlicensed band transmission burst including a plurality of subframes in consideration of an occupancy state of a channel of an unlicensed band and transmits the unlicensed band transmission burst through the unlicensed band. In this case, at least one subframe of the plurality of subframes has a different type from the remaining subframes.
1. A method for configuring a frame of an unlicensed band at a communication node, comprising:
configuring an unlicensed band transmission burst in consideration of an occupancy state of a channel of the unlicensed band;
transmitting the unlicensed band transmission burst through the unlicensed band; and
signaling information of subframes configuring the unlicensed band transmission burst,
wherein the unlicensed band transmission burst includes a plurality of continuous subframes, and at least one of the plurality of subframes is a subframe of a different type from the remaining subframes; and
wherein the information includes at least one of the number of symbols including CRS configured in the subframe, information on a last subframe of the unlicensed band transmission burst, the number of symbols configuring a partial subframe, the number of subframes of the unlicensed band transmission burst, the number of subframes in which a control channel region is not monitored after the unlicensed band transmission burst currently transmitted expires, the number of remaining subframes of an unlicensed band transmission burst currently transmitted, the number of subframes of a subsequent unlicensed band transmission burst, whether a channel state information-reference signal (CSI-RS)/channel state information-interference measurement (CSI-IM) is configured, and transmit power of the CRS/CSI-RS.
2. The method of claim 1 , further comprising: adding an unlicensed band signal to a start location of the unlicensed band transmission burst.
3. The method of claim 1 , wherein: the at least one subframe includes a partial subframe having a time length shorter than that of the remaining subframes.
4. The method of claim 3 , wherein: the remaining subframes include a plurality of symbols in a time domain, and the partial subframe does not transmit a signal for a part of first or last time in the time length of the remaining subframes.
5. The method of claim 1 , wherein: the at least one subframe is an uplink subframe and the remaining subframes are a downlink subframe.
6. The method of claim 1 , wherein: the at least one subframe includes a subframe in which a symbol in which a cell-specific reference signal (CRS) is present and a symbol in which the cell-specific reference signal (CRS) is not present are mixed.
7. The method of claim 1 , wherein: the at least one subframe includes a subframe in which an unlicensed band discovery reference signal (DRS) is multiplexed with a physical downlink shared channel (PDSCH).
8. The method of claim 1 , wherein: the at least one subframe includes an uplink subframe consisting of only a physical uplink control channel (PUCCH).
9. The method of claim 1 , wherein: the at least one subframe includes a subframe in which primary synchronization signal (PSS)/a secondary synchronization signal (SSS) are included.
10. The method of claim 1 , wherein: the signaling includes transmitting the information using at least one of a physical HARQ indicator channel (PHICH) defined for uplink hybrid automatic repeat reQuest feedback, an unlicensed cell-radio network temporary identifier (U-RNTI) associated with an unlicensed band cell, and downlink control information (DCI).
11. The method of claim 10 , wherein: the signaling includes transmitting the information by a combination of at least one of a PHICH group, a PHICH sequence, and a PHICH information bit.
12. An apparatus for configuring a frame of an unlicensed band at a communication node, comprising:
a processor assessing an occupancy state of a channel of the unlicensed band to configure an unlicensed band transmission burst continuously transmitting a plurality of subframes and generating signaling information for informing information of subframes of the unlicensed band transmission burst; and
a transmitting/receiving device connected to a network to transmit the unlicensed band transmission burst and signaling information,
wherein at least one of the plurality of subframes is a subframe of a different type from the remaining subframes, and
wherein: the signaling information includes at least one of the number of symbols including a cell-specific reference signal (CRS) configured in the subframe, information on a last subframe of the unlicensed band transmission burst, the number of symbols configuring a partial subframe, the number of subframes of the unlicensed band transmission burst, the number of subframes in which a control channel region is not monitored after the unlicensed band transmission burst currently transmitted expires, the number of remaining subframes of an unlicensed band transmission burst currently transmitted, the number of subframes of a subsequent unlicensed band transmission burst, whether a channel state information-reference signal (CSI-RS)/channel state information-interference measurement (CSI-IM) is configured, and transmit power of the CRS/CSI-RS.
13. The apparatus of claim 12 , wherein: the at least one subframe includes a downlink subframe including a synchronization signal and the remaining subframes include a downlink subframe not including the synchronization signal.
14. The apparatus of claim 12 , wherein: the at least one subframe includes a downlink subframe in which an unlicensed band discovery reference signal (DRS) is multiplexed with a physical downlink shared channel (PDSCH) and the remaining subframes include a downlink subframe not including a synchronization signal.
15. The apparatus of claim 12 , wherein: the at least one subframe is an uplink subframe and the remaining subframes are a downlink subframe.
16. The apparatus of claim 12 , wherein: the at least one subframe includes a partial subframe having a time length shorter than that of the remaining subframes.
17. The apparatus of claim 12 , wherein: the processor generates the signaling information using at least one of a physical HARQ indicator channel (PHICH) defined for uplink hybrid automatic repeat reQuest feedback, an unlicensed cell-radio network temporary identifier (U-RNTI) associated with an unlicensed band cell, and downlink control information (DCI).