Apparatus and method for beam failure recovery in wireless communication system
The disclosure relates to a pre-5th-generation (5G) or 5G communication system to be provided for supporting higher data rates beyond 4th-Generation (4G) communication system, such as long term evolution (LTE). A method for operating a terminal in wireless communication system is provided. The method includes receiving, from a base station, system information including at least one parameter associated a paging operation, and monitoring a paging occasion (PO) that is determined based on the at least one parameter, during a discontinuous reception (DRX) operation.
1 . A method performed by a terminal in wireless communication system, the method comprising:
transmitting, to a base station, a random access channel (RACH) preamble associated with a contention-based random access (CBRA) procedure
receiving, from the base station, a random access response message in response to the RACH preamble, wherein the random access response message includes an uplink grant;
identifying whether the ongoing CBRA procedure is initiated by beam failure recovery (BFR) and whether the terminal is configured to transmit BFR media access control (MAC) control element (CE) in an uplink message; and
based on that the ongoing CBRA procedure is identified to be initiated by BFR and the terminal is identified to be configured to transmit the BFR MAC CE in the uplink message, transmitting, to the base station, the uplink message including the BFR MAC CE based on the uplink grant.
2 . The method of claim 1 , further comprising:
identifying whether a reference signal for BFR is available or not based on pre-defined threshold,
wherein the BFR MAC CE includes an identifier of the reference signal for the BFR based on that the reference signal for BFR is available.
3 . The method of claim 2 , wherein the reference signal comprises a channel state information-reference signal (CSI-RS).
4 . The method of claim 1 ,
wherein the uplink message includes cell-network temporary identifier (C-RNTI) MAC CE based on that predefined condition is met, and
wherein the uplink message is generated based on a priority defined in order of the C-RNTI MAC CE and the BFR MAC CE.
5 . The method of claim 1 , further comprising:
receiving, from the base station, information on a timer for performing BFR.
6 . A method performed by a base station in wireless communication system, the method comprising:
receiving, from a terminal, a random access channel (RACH) preamble associated with a contention-based random access (CBRA) procedure;
transmitting, to the terminal, a random access response message in response to the RACH preamble, wherein the random access response message includes an uplink grant; and
receiving, from the terminal, an uplink message including beam failure recovery (BFR) media access control (MAC) control element (CE) based on the uplink grant based on that the ongoing CBRA procedure is initiated by BFR and the terminal is configured to transmit the BFR MAC CE in the uplink message.
7 . The method of claim 6 , wherein the BFR MAC CE includes an identifier of a reference signal for the BFR based on that the reference signal for BFR is available.
8 . The method of claim 7 , wherein the reference signal comprises a channel state information-reference signal (CSI-RS).
9 . The method of claim 6 ,
wherein the uplink message includes cell-network temporary identifier (C-RNTI) MAC CE based on that predefined condition is met, and
wherein the uplink message is generated based on a priority defined in order of the C-RNTI MAC CE and the BFR MAC CE.
10 . The method of claim 6 , further comprising:
transmitting, to the terminal, information comprising timer for performing BFR.
11 . A terminal in wireless communication system, the terminal comprising:
a transceiver; and
a controller coupled to the transceiver and configured to:
transmit, to a base station, a random access channel (RACH) preamble associated with a contention-based random access (CBRA) procedure,
receive, from the base station, a random access response message in response to the RACH preamble, wherein the random access response message includes an uplink grant,
identify whether the ongoing CBRA procedure is initiated by beam failure recovery (BFR) and whether the terminal is configured to transmit BFR media access control (MAC) control element (CE) in an uplink message, and
based on that the ongoing CBRA procedure is identified to be initiated by BFR and the terminal is identified to be configured to transmit the BFR MAC CE in the uplink message, transmitting, to the base station, the uplink message including the BFR MAC CE based on the uplink grant.
12 . The terminal of claim 11 , wherein the controller is further configured to:
identify whether a reference signal for BFR is available or not based on pre-defined threshold,
wherein the BFR MAC CE includes an identifier of the reference signal for the BFR based on that the reference signal for BFR is available.
13 . The terminal of claim 12 , wherein the reference signal comprises a channel state information-reference signal (CSI-RS).
14 . The terminal of claim 11 ,
wherein the uplink message includes cell-network temporary identifier (C-RNTI) MAC CE based on that predefined condition is met, and
wherein the uplink message is generated based on a priority defined in order of the C-RNTI MAC CE and the BFR MAC CE.
15 . The terminal of claim 11 , wherein the controller is further configured to:
receive, from the base station, information comprising timer for performing BFR.
16 . A base station in wireless communication system, the base station comprising:
a transceiver; and
a controller coupled to the transceiver and configured to:
receive, from a terminal, a random access channel (RACH) preamble associated with a contention-based random access (CBRA) procedure,
transmit, to the terminal, a random access response message in response to the RACH preamble, wherein the random access response message includes an uplink grant, and
receive, from the terminal, an uplink message including beam failure recovery (BFR) media access control (MAC) control element (CE) based on the uplink grant based on that the ongoing CBRA procedure is initiated by BFR and the terminal is configured to transmit the BFR MAC CE in the uplink message.
17 . The base station of claim 16 , wherein the BFR MAC CE includes an identifier of a reference signal for the BFR based on that the reference signal for BFR is available.
18 . The base station of claim 17 , wherein the reference signal comprises a channel state information-reference signal (CSI-RS).
19 . The base station of claim 16 ,
wherein the uplink message includes cell-network temporary identifier (C-RNTI) MAC CE based on that predefined condition is met, and
wherein the uplink message is generated based on a priority defined in order of the C-RNTI MAC CE and the BFR MAC CE.
20 . The base station of claim 16 , wherein the controller is further configured to:
transmit, to the terminal, information comprising timer for performing BFR.