METHOD OF RANDOM ACCESS IN A WIRELESS SYSTEM

• US 20100067467A1
• Filed: 09/03/2009
• Published: 03/18/2010
• Est. Priority Date: 09/04/2008
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Yuk, Young Soo, Ryu, Ki Seon, Cho, Hee Jeong, Kim, Su Nam, Sung, Doo Hyun, Kim, Yong Ho
• Granted Patent: US 8,310,921 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04W 72/543 based on requested quality, e.g. QoS
• CPC Class Codes: H04W 74/004 in the uplink, i.e. towards network
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access

Abstract

A random access method in a wireless communication system is disclosed. The present invention includes transmitting a bandwidth request indicator and a quick access message from a mobile station to a base station and starting a timer having a timer value determined according to an acknowledgement from the base station.

Claims

1. A random access method of a mobile station in a wireless communication system, comprising the steps of:

transmitting a bandwidth request indicator and a quick access message to a base station; and

starting a timer having a timer value determined according to an acknowledgement from the base station.

2. The random access method of claim 1, wherein in the timer starting step, if the acknowledgement indicating that the base station does not receive the bandwidth request indicator or the quick access message is not received from the base station, the mobile station starts the timer having a differentiated value defined for a service flow between the mobile station and the base station.

3. The random access method of claim 2, further comprising the step of stopping the timer if an uplink resource is allocated by the base station.

4. The random access method of claim 2, further comprising the step of if an uplink resource is not allocated to the mobile station by the base station until the timer expires, retransmitting the bandwidth request indicator and the quick access message to the base station.

5. The random access method of claim 1, wherein in the timer starting step, if the acknowledgement indicating that the base station succeeds in decoding of the bandwidth request indicator but fails in decoding of the quick access message is received from the base station, the timer having a default value previously determined between the base station and the mobile station is started.

6. The random access method of claim 5, further comprising the steps of:

if an uplink resource is allocated by the base station, stopping the timer and transmitting a bandwidth request message to the base station via the uplink resource; and

if the acknowledgement indicating that the base station fails to receive the bandwidth request message is not received from the base station, starting the timer having a differentiated value determined according to a characteristic of data to be transmitted by the mobile station.

7. The random access method of claim 6, further comprising the step of if the uplink resource is not allocated by the base station until the timer having the differentiated value expires, retransmitting the bandwidth request indicator or the bandwidth request message to the base station.

8. A random access method of a mobile station in a wireless communication system, comprising the steps of:

transmitting a bandwidth request indicator to a base station; and

if an acknowledgement indicating that the base station fails to receive the bandwidth request indicator is not received from the base station, starting a timer having a default value previously determined between the base station and the mobile station.

9. In a mobile station of a wireless communication system, a method of performing a bandwidth request procedure using a random access, comprising the steps of:

transmitting a first bandwidth request to a base station to request a resource allocation for a data transmission; and

if there is no response from the base station for a first resource allocation standby time determined variably, transmitting a second bandwidth request to the base station.

10. The method of claim 9, wherein the first resource allocation standby time is variably determined according to at least one of a QoS level of the data and a priority of the mobile station.

11. The method of claim 10, further comprising the step of receiving resource allocation standby time for each QoS level from the base station via a broadcast message.

12. The method of claim 11, wherein the first resource allocation standby time is a resource allocation standby time corresponding to the QoS level of the data in the resource allocation standby time for each QoS level.

13. The method of claim 12, further comprising the steps of:

having an uplink resource allocated by the base station;

transmitting a bandwidth request message via the allocated uplink resource; and

if a response is not made by the base station for a second resource allocation standby time, transmitting a third bandwidth request to the base station.

14. The method of claim 13, wherein the second resource allocation standby time is equal to the first resource allocation standby time.

15. In a mobile station of a wireless communication system, a method of receiving an acknowledgement (hereinafter abbreviated ACK), comprising the steps of:

transmitting a random access code to a base station via a first resource region; and

receiving the ACK from the base station via a second resource region temporally spaced apart from the first resource region by an ACK delay.

16. The method of claim 15, wherein the ACK delay is defined by a frame unit and wherein the second resource region belongs to a frame spaced apart from a frame having the first resource region belong thereto by the ACK delay.

17. The method of claim 16, wherein the second resource region belongs to a subframe determined according to a subframe having the first resource region belong thereto within the frame spaced apart from the frame having the first resource region belong thereto.

18. The method of claim 15, further comprising the step of receiving a value of the ACK delay from the base station.

19. The method of claim 15, wherein a value of the ACK delay is determined between the mobile station and the base station in advance.

20. In a base station of a wireless communication system, a method of transmitting an acknowledgement (hereinafter abbreviated ACK), comprising the steps of:

receiving a random access code from a mobile station via a first resource region; and

transmitting the ACK to the mobile station via a second resource region temporally spaced apart from the first resource region by an ACK delay.