Method, apparatus, and system for transmitting or receiving control channel and data channel in wireless communication system
View Patent ↗A base station of a wireless communication system is disclosed. The base station of the wireless communication includes a communication module, and a processor. The processor generates a preemption indicator indicating a preempted resource. In this case, the resource indicated by the preemption indicator does not include an orthogonal frequency divisional multiplexing (OFDM) symbol configured as an uplink (UL) symbol by a radio resource control (RRC) signal. The processor is configured to transmit the preemption indicator to a user equipment of the wireless system based on a predetermined period.
1. A base station of a wireless communication system using a time division duplex (TDD) scheme, the base station comprising:
a communication module; and
a processor configured to control the communication module,
wherein the processor is configured to:
generate a preemption indicator indicating a preempted resource within a predetermined period, wherein the predetermined period includes a first plurality of orthogonal frequency division multiplexing (OFDM) symbols which comprise one or more uplink (UL) symbols, one or more downlink (DL) symbols, and one or more flexible symbols configured as neither a UL symbol nor a DL symbol, wherein the one or more DL symbols, the one or more UL symbols and the one or more flexible symbols are configured by a cell specific radio resource control (RRC) signal, wherein at least one of the one or more flexible symbols is additionally configured as a UL symbol by a user equipment specific RRC signal, and
transmit the preemption indicator to a user equipment of the wireless communication system based on the predetermined period,
wherein the preemption indicator indicates the preempted resource among a second plurality of OFDM symbols which are OFDM symbols included in the first plurality of OFDM symbols except for the one or more UL symbols configured by the cell specific RRC signal, wherein the second plurality of OFDM symbols includes the UL symbol configured by the user equipment specific RRC signal,
wherein the second plurality of OFDM symbols are divided into a plurality of groups, the preemption indicator includes a bitmap, and each of bits in the bitmap corresponds to each of the plurality of groups and indicates whether at least one OFDM symbol in a group corresponding to the each of bits in the bitmap is preempted,
wherein a number of the plurality of groups is predetermined,
wherein a number of the plurality of groups is N,
wherein a number of the second plurality of OFDM symbols is S,
wherein the processor is configured to group a first mod(S, N) groups among N groups such that each of the first mod(S, N) groups includes ceil(S/N) OFDM symbols and groups remaining N−mod(S, N) groups such that each of the N−mod(S, N) groups includes floor(S/N) OFDM symbols,
wherein the mod(x, y) represents x−floor(x/y)*y,
wherein the floor(x) represents a largest integer less than or equal to x,
wherein the ceil(x) represents a smallest integer number greater than or equal to x.
2. The base station of claim 1 , wherein a number of the first plurality of OFDM symbols between the predetermined periods is N_symb*T_INT*2 (μ-μ_INT) ,
wherein N_symb represents a number of OFDM symbols included in a slot,
wherein T_INT represents a periodicity of monitoring the preemption indicator,
wherein μ_INT represents a value satisfying that a subcarrier spacing of a carrier through which the preemption indicator is transmitted is 15*2 μ_INT kHz,
wherein μ represents a value satisfying that a subcarrier spacing of a carrier which is indicated by the preemption indicator is 15*2 μ kHz,
wherein the processor is configured to configure values of T_INT, μ, and μ_INT that makes a value of N_symb*T_INT*2 (μ-μ_INT) a natural number.
3. The base station of claim 1 , wherein the preemption indicator indicates a full bandwidth of a bandwidth part (BWP) used by the user equipment,
wherein the BWP is equal to or narrower than a bandwidth configured to the user equipment and is a frequency band through which the user equipment performs transmission and/or reception.
4. A user equipment of a wireless communication system using a time division duplex (TDD) scheme, the user equipment comprising:
a communication module;
and a processor configured to control the communication module,
wherein the processor is configured to:
periodically monitor a preemption indicator indicating a preempted resource within a predetermined period, wherein the predetermined period includes a first plurality of orthogonal frequency division multiplexing (OFDM) symbols which comprise one or more uplink (UL) symbols, one or more downlink (DL) symbols, and one or more flexible symbols configured as neither a UL symbol nor a DL symbol, wherein the one or more DL symbols, the one or more UL symbols and the one or more flexible symbols are configured by a cell specific radio resource control (RRC) signal, wherein at least one of the one or more flexible symbols is additionally configured as a UL symbol by a user equipment specific RRC signal,
when receiving the preemption indicator, determine a second plurality of OFDM symbols among which the preemption indicator indicates a preempted resource, wherein the second plurality of OFDM symbols are OFDM symbols included in the first plurality of OFDM symbols except for the one or more UL symbols configured by the cell specific RRC signal, wherein the second plurality of OFDM symbols includes the UL symbol configured by the user equipment specific RRC signal,
when receiving the preemption indicator, determine a resource in which transmission from a base station to the user equipment occurs among a resource scheduled to the user equipment based on the preemption indicator,
wherein the second plurality of OFDM symbols are divided into a plurality of groups, the preemption indicator includes a bitmap, and each of bits in the bitmap corresponds to each of the plurality of groups and indicates whether at least one OFDM symbol in a group corresponding to the each of bits in the bitmap is preempted,
wherein a number of the plurality of groups is predetermined,
wherein a number of the plurality of groups is N,
wherein a number of the second plurality of OFDM symbols is S,
wherein each of mod(S, N) groups includes ceil(S/N) OFDM symbols and each of N−mod(S, N) groups includes floor(S/N) OFDM symbols,
wherein the mod(x, y) represents x−floor(x/y)*y,
wherein the floor(x) represents a largest integer less than or equal to x,
wherein the ceil(x) represents a smallest integer number greater than or equal to x.
5. The user equipment of claim 4 , wherein a number of the first plurality of OFDM symbols between periods of monitoring the preemption indicator is N_symb*T_INT*2 (μ-μ_INT) ,
wherein N_symb represents a number of OFDM symbols included in a slot,
wherein T_INT represents a periodicity of monitoring the preemption indicator,
wherein μ_INT represents a value satisfying that a subcarrier spacing of a carrier through which the preemption indicator is transmitted is 15*2 μ_INT kHz,
wherein μ represents a value satisfying that a subcarrier spacing of a carrier which is indicated by the preemption indicator is 15*2 μ kHz,
wherein the processor is configured to expect values of T_INT, μ, and μ_INT that make a value of N_symb*T_INT*2 (μ-μ_INT) a natural number.
6. The user equipment of claim 4 , wherein the preemption indicator indicates a full bandwidth of a bandwidth part (BWP) used by the user equipment,
wherein the BWP is equal to or narrower than a bandwidth configured to the user equipment and is a frequency band through which the user equipment performs transmission and/or reception.
7. A method of operating a user equipment of a wireless system using a time division duplex (TDD) scheme, the method comprising:
periodically monitoring a preemption indicator indicating a preempted resource within a predetermined period, wherein the predetermined period includes a first plurality of orthogonal frequency division multiplexing (OFDM) symbols which comprise one or more uplink (UL) symbol, one or more downlink (DL) symbols, and one or more flexible symbols configured as neither a UL symbol nor a DL symbol, wherein the one or more DL symbols, the one or more UL symbols and the one or more flexible symbols are configured by a cell specific radio resource control (RRC) signal, wherein at least one of the one or more flexible symbols is additionally configured as a UL symbol by a user equipment specific RRC signal, and
when receiving the preemption indicator, determining a second plurality of OFDM symbols among which the preemption indicator indicates a preempted resource, wherein the second plurality of OFDM symbols are OFDM symbols included in the first plurality of OFDM symbols except for the one or more UL symbols configured by the cell specific RRC signal, wherein the second plurality of OFDM symbols includes the UL symbol configured by the user equipment specific RRC signal,
when receiving the preemption indicator, determining a resource in which transmission from a base station to the user equipment occurs among a resource scheduled to the user equipment based on the preemption indicator, and
decoding data received from the base station based on the determined resource,
wherein the second plurality of OFDM symbols are divided into a plurality of groups, the preemption indicator includes a bitmap, and each of bits in the bitmap corresponds to each of the plurality of groups and indicates whether at least one OFDM symbol in a group corresponding to the each of bits in the bitmap is preempted,
wherein a number of the plurality of groups is predetermined,
wherein the number of the plurality of groups is N,
wherein a number of the second plurality of OFDM symbols is S,
wherein each of mod(S, N) groups includes ceil(S/N) OFDM symbols and each of N−mod(S, N) groups includes floor(S/N) OFDM symbols,
wherein the mod(x, y) represents x−floor(x/y)*y,
wherein the floor(x) represents a largest integer less than or equal to x,
wherein the ceil(x) represents a smallest integer number greater than or equal to x.
8. The method of claim 7 , wherein a number of the first plurality of OFDM symbols between periods of monitoring the preemption indicator is N_symb*T_INT*2 (μ-μ_INT) ,
wherein N_symb represents a number of OFDM symbols included in a slot,
wherein T_INT represents a periodicity of monitoring the preemption indicator,
wherein μ_INT represents a value satisfying that a subcarrier spacing of a carrier through which the preemption indicator is transmitted is 15*2 μ_INT kHz,
wherein μ represents a value satisfying that a subcarrier spacing of a carrier which is indicated by the preemption indicator is 15*2 μ kHz,
wherein the method further comprises expecting values of T_INT, μ, and μ_INT that make a value of N_symb*T_INT*2 (μ-μ_INT) a natural number.
9. A method of operating a base station of a wireless communication system using a time division duplex (TDD) scheme, the method comprising:
generating a preemption indicator indicating a preempted resource within a predetermined period, wherein the predetermined period includes a first plurality of orthogonal frequency division multiplexing (OFDM) symbols which comprise one or more uplink (UL) symbols, one or more downlink (DL) symbols, and one or more flexible symbols configured as neither a UL symbol nor a DL symbol, wherein the one or more DL symbols, the one or more UL symbols and the one or more flexible symbols are configured by a cell specific radio resource control (RRC) signal, wherein at least one of the one or more flexible symbols is additionally configured as a UL symbol by a user equipment specific RRC signal, and
transmitting the preemption indicator to a user equipment of the wireless communication system based on the predetermined period,
wherein the preemption indicator indicates a preempted resource among a second plurality of OFDM symbols which are OFDM symbols included in the first plurality of OFDM symbols except for the one or more UL symbols configured by the cell specific RRC signal, wherein the second plurality of OFDM symbols includes the UL symbol configured by the user equipment specific RRC signal,
wherein the second plurality of OFDM symbols are divided into a plurality of groups, the preemption indicator includes a bitmap, and each of bits in the bitmap corresponds to each of the plurality of groups and indicates whether at least one OFDM symbol in a group corresponding to the each of bits in the bitmap is preempted,
wherein a number of the plurality of groups is predetermined,
wherein a number of the plurality of groups is N,
wherein a number of the second plurality of OFDM symbols is S,
wherein the method further comprises grouping a first mod(S, N) groups among N groups such that each of the first mod(S, N) groups includes ceil(S/N) OFDM symbols and groups remaining N−mod(S, N) groups such that each of the N−mod(S, N) groups includes floor(S/N) OFDM symbols,
wherein the mod(x, y) represents x−floor(x/y)*y,
wherein the floor(x) represents a largest integer less than or equal to x,
wherein the ceil(x) represents a smallest integer number greater than or equal to x.
10. The method of claim 9 , wherein a number of the first plurality of OFDM symbols between the predetermined periods is N_symb*T_INT*2 (μ-μ_INT) ,
wherein N_symb represents a number of OFDM symbols included in a slot,
wherein T_INT represents a periodicity of monitoring the preemption indicator,
wherein μ_INT represents a value satisfying that a subcarrier spacing of a carrier through which the preemption indicator is transmitted is 15*2 μ_INT kHz,
wherein μ represents a value satisfying that a subcarrier spacing of a carrier which is indicated by the preemption indicator is 15*2 μ kHz,
wherein the method further comprises configuring values of T_INT, μ, and μ_INT that makes a value of N_symb*T_INT*2 (μ-μ_INT) a natural number.