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;
starting a timealignmenttimer timer related to the TA information;
transmitting a request message for requesting the system information based on the TA information;
receiving a response message as a response to the request message;
transmitting a hybrid automatic repeat request (HARQ) acknowledgment (ACK) for the response message; and
stopping the timealignmenttimer timer after the transmission of the HARQ ACK.
2. The method of claim 1 , wherein the receiving of the random access response message comprises applying the TA information included in the random access response message in case that the timealignmenttimer timer is not run.
3. The method of claim 1 , wherein the terminal is in an idle state or an inactive state.
4. The method of claim 3 , further comprising:
transmitting a random access preamble for initial access, after stopping the timealignmenttimer timer; and
receiving a response message as a response to the random access preamble for initial access.
5. The method of claim 1 , wherein the response message includes a contention resolution message related to the request for the system information.
6. The method of claim 1 , wherein the request message includes information on the requested system information.
7. 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 request message.
8. The method of claim 7 , wherein the uplink resource allocation information including a modulation and coding scheme and power adjustment information.
9. 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,
start a timealignmenttimer timer related to the TA information,
transmit a request message for requesting the system information based on the TA information,
receive a response message as a response to the request message,
transmit a hybrid automatic repeat request (HARQ) acknowledgment (ACK) for the response message, and
stop the timealignmenttimer timer after the transmission of the HARQ ACK.
10. The terminal of claim 9 , 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 timealignmenttimer timer is not run.
11. The terminal of claim 9 , wherein the terminal is further configured to be in an idle state or an inactive state.
12. The terminal of claim 11 , wherein the at least one processor is further configured to:
transmit a random access preamble for initial access, after stopping the timealignmenttimer timer, and
receive a response message as a response to the random access preamble for initial access.
13. The terminal of claim 9 , wherein the response message includes a contention resolution message related to the request for the system information.
14. The terminal of claim 9 , wherein the request message includes information on the requested system information.
15. The terminal of claim 9 , 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 request message.
16. The terminal of claim 15 , wherein the uplink resource allocation information including a modulation and coding scheme and power adjustment information.