Method and apparatus for transmitting/receiving signal by using variable band width in communication system
A method and an apparatus for transmitting/receiving a signal by using a variable band width in a communication system are disclosed. An operating method of a terminal comprises the steps of: receiving, from a base station, first configuration information about one or more guard bands of an unlicensed band; confirming the one or more guard bands configured in the unlicensed band on the basis of the first configuration information; and confirming a plurality of RB sets configured in the unlicensed band on the basis of the one or more guard bands. Therefore, performance of the communication system can be improved.
1. A method of a terminal, the method comprising:
receiving first configuration information of one or more guard bands of an unlicensed band from a base station;
identifying the one or more guard bands configured in the unlicensed band based on the first configuration information;
identifying a plurality of resource block (RB) sets configured in the unlicensed band based on the one or more guard bands;
receiving, from the base station, second configuration information indicating one or more available RB sets among the plurality of RB sets; and
performing communication with the base station in the one or more available RB sets indicated by the second configuration information,
wherein a measurement operation of a channel state information reference signal (CSI-RS) is not performed in an RB set which is not indicated by the second configuration information as an available RB set, the first configuration information includes a starting guard RB (G-RB) index and an ending G-RB index of each of the one or more guard bands, and when N guard bands are configured, a number of pairs of the starting G-RB index and the ending G-RB index, which are included in the first configuration information, is N, and N is an integer equal to or greater than 1.
2. The method according to claim 1 , wherein a number of the plurality of RB sets configured within a bandwidth part (BWP) of the unlicensed band is N+1.
3. The method according to claim 1 , wherein a number of RBs included in each of the plurality of RB sets is a number of RBs located between adjacent guard bands.
4. The method according to claim 1 , wherein:
a starting RB set among the plurality of RB sets includes a starting RB of the unlicensed band to an RB just before a starting G-RB of a starting guard band among the one or more guard bands, and an ending RB set among the plurality of RB sets includes an RB after an ending G-RB of an ending guard band among the one or more guard bands to an ending RB of the unlicensed band; and
the starting RB set is an RB set having a lowest frequency resource among the plurality of RB sets, the ending RB set is an RB set having a highest frequency resource among the plurality of RB sets, the starting guard band is a guard band having a lowest frequency resource among the one or more guard bands, and the ending guard band is a guard band having a highest frequency resource among the one or more guard bands.
5. The method according to claim 1 , wherein each of the one or more guard bands is located between adjacent two RB sets.
6. The method according to claim 1 , wherein the second configuration information is a bitmap, and the bitmap is included in downlink control information (DCI).
7. The method according to claim 1 , wherein resources of the CSI-RS are configured in the plurality of RB sets, and a measurement operation on the CSI-RS is performed in the one or more available RB sets.
8. A method of a base station, the method comprising:
configuring one or more guard bands of an unlicensed band;
transmitting first configuration information of the one or more guard bands to the terminal;
transmitting second configuration information indicating one or more available resource block (RB) sets to a terminal; and
performing communication with the terminal by using the one or more available RB sets indicated by the second configuration information,
wherein a reporting operation of a measurement result of a channel state information reference signal (CSI-RS) is not performed in an RB set which is not indicated by the second configuration information as an available RB set, a plurality of RB sets configured in frequency resources excluding the one or more guard bands in the unlicensed band, the first configuration information includes a starting guard RB (G-RB) index and an ending G-RB index of each of the one or more guard bands, and when N guard bands are configured, a number of pairs of the starting G-RB index and the ending G-RB index, which are included in the first configuration information, is N, and N is an integer equal to or greater than 1.
9. The method according to claim 8 , wherein a number of the plurality of RB sets configured within a bandwidth part (BWP) of the unlicensed band is N+1, and a number of RBs included in each of the plurality of RB sets is a number of RBs located between adjacent guard bands.
10. The method according to claim 8 , wherein the second configuration information is a bitmap, and the bitmap is included in downlink control information (DCI).
11. The method according to claim 8 , wherein resources of the CSI-RS are configured in the plurality of RB sets, and the reporting operation of the measurement result on the CSI-RS is performed in the one or more available RB sets.
12. The method according to claim 8 , further comprising transmitting, to the terminal, third configuration information of a control resource set (CORESET) configured in an unlicensed band and fourth configuration information of a search space configured in the unlicensed band, wherein the third configuration information is commonly applied to a plurality of RB sets, and a number of RBs in which the CORESET is disposed is equal to or less than a number of RBs belonging to one RB set.
13. The method according to claim 12 , wherein the third configuration information includes an offset indicating a position of the CORESET in a frequency axis, and the offset indicates a difference between a starting RB of the unlicensed band and a starting RB of the CORESET.
14. The method according to claim 12 , wherein the search space associated with the CORESET is repeated in the plurality of RB sets, and the fourth configuration information includes a field indicating whether the search space is configured in each of the plurality of RB sets.
15. A terminal, the terminal comprising a processor and a memory storing at least one instruction executable by the processor, wherein the at least one instruction causes the processor to:
receive first configuration information of one or more guard bands of an unlicensed band from a base station;
identify the one or more guard bands configured in the unlicensed band based on the first configuration information;
identify a plurality of resource block (RB) sets configured in the unlicensed band based on the one or more guard bands;
receive, from the base station, fourth configuration information indicating one or more available RB sets among the plurality of RB sets; and
performing communication with the base station in the one or more available RB sets indicated by the fourth configuration information,
wherein a measurement operation of a channel state information reference signal (CSI-RS) is not performed in a RB set which is not indicated by the fourth configuration information as an available RB set, the first configuration information includes a starting guard RB (G-RB) index and an ending G-RB index of each of the one or more guard bands, when N guard bands are configured, a number of pairs of the starting G-RB index and the ending G-RB index, which are included in the first configuration information, is N, a number of the plurality of RB sets configured within a bandwidth part (BWP) of the unlicensed band is N+1; and N is an integer equal to or greater than 1.
16. The terminal according to claim 15 , wherein the at least one instruction further causes the processor to:
receive, from the base station, second configuration information of a control resource set (CORESET) configured in an unlicensed band and third configuration information of a search space configured in the unlicensed band,
wherein the second configuration information includes an offset indicating a position of the CORESET in a frequency axis, and the offset indicates a difference between a starting RB of the unlicensed band and a starting RB of the CORESET.
17. The terminal according to claim 16 , wherein the search space associated with the CORESET is repeated in a plurality of RB sets, and the third configuration information includes a field indicating whether the search space is configured in each of the plurality of RB sets.