Apparatus and method for performing beam sweeping using RIS pattern in wireless communication system
Methods and apparatuses are provided in which a slot is generated including a symbol and a synchronization signal, which is transmitted through the symbol. The slot is transmitted to a reconfigurable intelligent surface (RIS) and a user equipment (UE). The symbol is used to determine an operation to be performed by the UE during a predetermined time period including the slot. The slot is transmitted to the UE through beams formed according to a first RIS pattern. A result of measuring each beam based on the beams is received from the UE. A second RIS pattern is determined for transmitting data based on the result of measuring each beam. A signal for controlling the first RIS pattern based on the second RIS pattern is transmitted to the RIS. A data signal is transmitted to the UE through the RIS. The second RIS pattern is applied to the RIS.
1 . A method performed by a base station in a wireless communication system, the method comprising:
identifying a slot including a first symbol for a synchronization signal;
transmitting, to a reconfigurable intelligent surface (RIS) and a user equipment (UE), a first signal on the slot including the first symbol, wherein the first symbol indicates the slot is for an operation to be performed by the UE;
transmitting, to the UE, a second signal through one or more beams formed according to a first RIS pattern;
receiving, from the UE, a result of measuring each beam based on the one or more beams formed according to the first RIS pattern;
determining a second RIS pattern for transmitting data based on the result of measuring each beam;
transmitting, to the RIS, a third signal for controlling the first RIS pattern based on the second RIS pattern;
transmitting, to the UE, a data signal through the RIS, wherein the second RIS pattern is applied to the RIS; and
based on the first symbol indicating the slot is for a conversion of the first RIS pattern, transmitting, to the UE, information configuring the UE to enter an idle mode.
2 . The method of claim 1 , wherein:
the slot includes a second symbol including an indicator indicating the one or more beams formed according to the first RIS pattern,
the first symbol is mapped based on an m-sequence, and
the second symbol is encoded by using a cyclic shift (CS) which is based on a Zadoff-Chu sequence.
3 . The method of claim 1 , further comprising:
transmitting, to the UE, a synchronization signal block (SSB),
wherein the SSB includes information for the slot, and
wherein the information for the slot includes at least one of a flag indicator for the slot, information associated with an offset for the slot, or information associated with a transmission period for the slot.
4 . The method of claim 1 , wherein the first symbol includes information indicating the slot is associated with the operation for one of the conversion of the first RIS pattern, a detection of an RIS pattern index, or a decoding of data.
5 . The method of claim 1 , based on the first symbol indicating the slot is for the conversion of the first RIS pattern, further comprising:
transmitting, to the RIS, information configuring conversion of the first RIS pattern.
6 . A method performed by a user equipment (UE) in a wireless communication system, the method comprising:
receiving, from a base station, a first signal on a slot including a first symbol for a synchronization signal, wherein the first symbol indicates the slot is for an operation to be performed by the UE;
receiving, from the base station, a second signal through one or more beams formed according to a first reconfigurable intelligent surface (RIS) pattern;
measuring each beam based on the one or more beams formed according to the first RIS pattern;
transmitting, to the base station, a result of measuring each beam;
receiving, from the base station, a data signal through an RIS, wherein a second RIS pattern determined based on the result of measuring each beam is applied to the RIS, and
based on the first symbol indicating the slot is for a conversion of the first RIS pattern, receiving, from the base station, information configuring the UE to enter an idle mode.
7 . The method of claim 6 , wherein:
the slot includes a second symbol including an indicator indicating the one or more beams formed according to the first RIS pattern,
the first symbol is mapped based on an m-sequence,
the second symbol is encoded by using a cyclic shift (CS) which is based on a Zadoff-Chu sequence, and
the method further comprises:
identifying the operation to be performed by the UE, based on a correlation value of the m-sequence transmitted through the first symbol; and
identifying the one or more beams formed according to the first RIS pattern, based on a correlation value of the Zadoff-Chu sequence transmitted through the second symbol.
8 . The method of claim 6 , further comprising:
receiving, from the base station, a synchronization signal block (SSB),
wherein the SSB includes information for the slot, and
wherein the information for the slot includes at least one of a flag indicator for the slot, information associated with an offset for the slot, or information associated with a transmission period for the slot.
9 . The method of claim 6 , wherein the first symbol includes information indicating the slot is associated with the operation for one of the conversion of the first RIS pattern, a detection of an RIS pattern index, or a decoding of data.
10 . A base station in a wireless communication system, the base station comprising:
a transceiver; and
a controller coupled with the transceiver, and
configured to:
identify a slot including a first symbol for a synchronization signal;
transmit, to a reconfigurable intelligent surface (RIS) and a user equipment (UE), a first signal on the slot including the first symbol, wherein the first symbol indicates the slot is for an operation to be performed by the UE;
transmit, to the UE, a second signal through one or more beams formed according to a first RIS pattern;
receive, from the UE, a result of measuring each beam based on the one or more beams formed according to the first RIS pattern;
determine a second RIS pattern for transmitting data based on the result of measuring each beam;
transmit, to the RIS, a third signal for controlling the first RIS pattern based on the second RIS pattern;
transmit, to the UE, a data signal through the RIS, wherein the second RIS pattern is applied to the RIS, and
based on the first symbol indicating the slot is for a conversion of the first RIS pattern, transmit, to the UE, information configuring the UE to enter an idle mode.
11 . The base station of claim 10 , wherein:
the slot includes a second symbol including an indicator indicating the one or more beams formed according to the first RIS pattern,
the first symbol is mapped based on an m-sequence, and
the second symbol is encoded by using a cyclic shift (CS) which is based on a Zadoff-Chu sequence.
12 . The base station of claim 10 , wherein:
the controller is further configured to transmit, to the UE, a synchronization signal block (SSB),
wherein the SSB includes information for the slot, and
wherein the information for the slot includes at least one of a flag indicator for the slot, information associated with an offset for the slot, or information associated with a transmission period for the slot.
13 . The base station of claim 10 , wherein the first symbol includes information indicating the slot is associated with the operation for one of the conversion of the first RIS pattern, a detection of an RIS pattern index, or a decoding of data.
14 . The base station of claim 13 , wherein, based on the first symbol indicating the slot is for the conversion of the first RIS pattern, the controller is further configured to:
transmit, to the RIS, information configuring the conversion of the first RIS pattern.
15 . A user equipment (UE) in a wireless communication system, the UE comprising:
a transceiver; and
a controller coupled with the transceiver, and
configured to:
receive, from a base station, a first signal on a slot including a first symbol for a synchronization signal, wherein the first symbol indicates the slot is for an operation to be performed by the UE;
receive, from the base station, a second signal through one or more beams formed according to a first reconfigurable intelligent surface (RIS) pattern;
measure each beam based on the one or more beams formed according to the first RIS pattern;
transmit, to the base station, a result of measuring each beam;
receive, from the base station, a data signal through an RIS, wherein a second RIS pattern determined based on the result of measuring each beam is applied to the RIS; and
based on the first symbol indicating the slot is for a conversion of the first RIS pattern, receive, from the base station, information configuring the UE to enter an idle mode.
16 . The UE of claim 15 , wherein:
the slot includes a second symbol including an indicator indicating the one or more beams formed according to the first RIS pattern,
the first symbol is mapped based on an m-sequence,
the second symbol is encoded by using a cyclic shift (CS) which is based on a Zadoff-Chu sequence, and
the controller is further configured to:
identify the operation to be performed by the UE, based on a correlation value of the m-sequence transmitted through the first symbol; and
identify the one or more beams formed according to the first RIS pattern, based on a correlation value of the Zadoff-Chu sequence transmitted through the second symbol.
17 . The UE of claim 15 , wherein:
the controller is further configured to receive, from the base station, a synchronization signal block (SSB),
wherein the SSB includes information for the slot, and
wherein the information for the slot includes at least one of a flag indicator for the slot, information associated with an offset for the slot, or information associated with a transmission period for the slot.
18 . The UE of claim 15 , wherein the first symbol includes information indicating the slot is associated with the operation for one of the conversion of the first RIS pattern, a detection of an RIS pattern index, or a decoding of data.