Method and apparatus for controlling uplink time alignment in broadband wireless communication system
A communication technique for convergence of internet of things (IoT) technology, a fifth-generation (5G) communication system for supporting a higher data transfer rate beyond a fourth-generation (4G) system, and a system therefor are provided. The disclosure can be applied to intelligent services (e.g., smart homes, smart buildings, smart cities, smart or connected cars, health care, digital education, retail business, and services associated with security and safety) based on 5G communication technology and IoT-related technology. An embodiment relates to a method for controlling an uplink time alignment during execution of random access by a base station operating a broadband.
1. A method performed by a terminal in a communication system, the method comprising:
transmitting a random access preamble of random access procedure for requesting system information;
receiving a random access response message including timing advance (TA) information;
transmitting a message for requesting the system information based on the TA information;
receiving a first response message;
transmitting a hybrid automatic repeat request (HARQ) acknowledgment (ACK) for the first response message; and
stopping a timealignmenttimer (TAT) related to the TA information based on the HARQ ACK.
2. The method of claim 1 , wherein the receiving of the random access response message comprises applying TA information included in the random access response message in case that the TAT is not run.
3. The method of claim 1 , wherein the receiving of the random access response message further comprises starting the TAT.
4. The method of claim 1 , wherein the terminal is in an idle state or an inactive state.
5. The method of claim 4 , further comprising:
transmitting a random access preamble for initial access, after stopping the TAT; and
receiving a second response message in response to transmitting the random access preamble for initial access,
wherein TA information included in the second response message is used based on the TAT.
6. The method of claim 1 , wherein the first response message includes a contention resolution message related to the request for the system information.
7. The method of claim 1 , wherein the message for requesting the system information includes information on the requested system information.
8. The method of claim 1 , wherein the random access response message further includes uplink resource allocation information including information on a resource that the terminal is to use to transmit the message for requesting the system information.
9. The method of claim 8 , wherein the uplink resource allocation information further includes information on a position and a size of the resource, a modulation and coding scheme used to transmit the message for requesting the system information, and power adjustment information during transmission of the message for requesting the system information.
10. A terminal in a communication system, the terminal comprising:
a transceiver; and
at least one processor configured to:
transmit a random access preamble of random access procedure for requesting system information,
receive a random access response message including timing advance (TA) information,
transmit a message for requesting the system information based on the TA information,
receive a first response message,
transmit a hybrid automatic repeat request (HARQ) acknowledgment (ACK) for the first response message, and
stop a timealignmenttimer (TAT) related to the TA information based on the HARQ ACK.
11. The terminal of claim 10 , wherein the at least one processor is further configured to apply the TA information included in the random access response message in case that the TAT is not run.
12. The terminal of claim 10 , wherein the at least one processor is further configured to start the TAT.
13. The terminal of claim 10 , wherein the terminal is further configured to be in an idle state or an inactive state.
14. The terminal of claim 13 ,
wherein the at least one processor is further configured to:
transmit a random access preamble for initial access, after stopping the TAT; and
receive a second response message in response to transmitting the random access preamble for initial access, and
wherein TA information included in the second response message is used based on the stopping of the TAT.
15. The terminal of claim 10 , wherein the first response message includes a contention resolution message related to the request for the system information.
16. The terminal of claim 10 , wherein the message for requesting the system information includes information on the requested system information.
17. The terminal of claim 10 , wherein the random access response message further includes uplink resource allocation information including information on a resource that the terminal is to use to transmit the message for requesting the system information.
18. The terminal of claim 17 , wherein the uplink resource allocation information further includes information on a position and a size of the resource, a modulation and coding scheme used to transmit the message for requesting the system information, and power adjustment information during transmission of the message for requesting the system information.