Method of Handling Random Access Response

• US 20130021993A1
• Filed: 07/16/2012
• Published: 01/24/2013
• Est. Priority Date: 07/19/2011
• Status: Active Grant

• Current Assignee: Acer, Inc.
• Original Assignee: Industrial Technology Research Institute
• Inventors: Chou, Chie-Ming
• Granted Patent: US 9,369,980 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04L 1/1867 Arrangements specially adapted for the transmitter end
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365
• CPC Class Codes: H04W 56/0045 compensating for timing error by altering transmission time
• CPC Class Codes: H04W 74/08 Non-scheduled access, e.g. ALOHA hybrid access H04W74/02

Abstract

A method of handling random access response for a network in a wireless communication system is disclosed. The method comprises receiving a first random access preamble from a first mobile device of the wireless communication system at a first component carrier of a plurality of component carriers, receiving a second random access preamble from a second mobile device of the wireless communication system at a second component carrier of the plurality of component carriers, wherein the second random access preamble is identical to the first random access preamble and is assigned by the network, and responding to the assigned second random access preamble with a random access response including a timing advance command associated to the second mobile device, at the first component carrier.

Claims

1. A method of handling random access response for a network in a wireless communication system, the method comprising:

receiving a first random access preamble from a first mobile device of the wireless communication system at a first component carrier of a plurality of component carriers;

receiving a second random access preamble from a second mobile device of the wireless communication system at a second component carrier of the plurality of component carriers, wherein the second random access preamble is identical to the first random access preamble and is assigned by the network; and

responding to the assigned second random access preamble with a random access response including a timing advance command associated to the second mobile device, at the first component carrier.

2. The method of claim 1, further comprising:

ignoring the first random access preamble from the first mobile device at the first component carrier.

3. A method of handling random access response for a network in a wireless communication system, the method comprising:

assigning a first random access preamble for a first mobile device in a first component carrier of a plurality of component carriers,;

receiving a second random access preamble from a second mobile device at a second component carrier, wherein the second random access preamble is identical to the first random access preamble;

receiving no assigned first random access preamble from the first mobile device at the first component carrier during a period of time; and

responding no random access response to the first and second random access preambles.

4. A method of handling random access response for a mobile device in a wireless communication system, the method comprising:

being assigned a random access preamble in one of the plurality of component carriers by a network of the wireless communication system;

transmitting the random access preamble to the network;

receiving a random access response, including a temporary cell radio network temporary identifier (T-CRNTI) and corresponding to the random access preamble, from the network; and

determining whether the random access response including a timing advance command is for the mobile device according to the T-CRNTI in the random access response.

5. The method of claim 4, wherein the step of determining whether the random access response including the timing advance command is for the mobile device according to the T-CRNTI in the random access response comprises:

determining that the random access response is for the mobile device when the T-CRNTI is equivalent to a C-RNTI of the mobile device; and

applying the timing advance command included in the random access response for an uplink synchronization.

6. The method of claim 4, wherein the step of determining whether the random access response including the timing advance command is for the mobile device according to the T-CRNTI in the random access response comprises:

determining that the random access response is not for the mobile device when the T-CRNTI is not equivalent to a C-RNTI of the mobile device; and

not applying the timing advance command included in the random access response for an uplink synchronization.

7. A method of handling random access response for a mobile device in a wireless communication system, the method comprising:

transmitting a first random access preamble of a contention based random access procedure, to a network of the wireless communication system;

receiving a random access response including an indicator from the network; and

determining whether the received random access response is for the contention based random access procedure according to the indicator in the random access response.

8. The method of claim 7, wherein determining whether the received random access response is for the contention based random access procedure according to the indicator in the random access response comprises:

determining that the random access response is not for the contention based random access procedure when the indicator is set to a predetermined value.

9. The method of claim 8, further comprising:

discontinuing a contention resolution of the contention based random access procedure when determining that the random access response is not for the contention based random access procedure.

10. The method of claim 8, further comprising:

transmitting a second random access preamble of the contention based random access procedure, to the network of the wireless communication system.

11. A method of handling random access response for a mobile device in a wireless communication system, the method comprising:

transmitting a first random access preamble of a contention based random access procedure, to a network of the wireless communication system;

receiving a random access response including an uplink grant from the network; and

determining whether the received random access response is for the contention based random access procedure according to a size of the uplink grant.

12. The method of claim 11, wherein determining whether the received random access response is for the contention based random access procedure according to the size of the uplink grant comprises:

determining that the random access response is not for the contention based random access procedure when the size of the uplink grant is smaller than a threshold.

13. The method of claim 12, further comprising:

discontinuing a contention resolution of the contention based random access procedure when determining that the random access response is not for the contention based random access procedure.

14. The method of claim 12, further comprising:

transmitting a second random access preamble of the contention based random access procedure, to the network of the wireless communication system.

15. The method of claim 12, wherein the threshold is determined according to a size of a message 3 of the contention based random access procedure.

16. A method of handling random access response for a mobile device in a wireless communication system, the method comprising:

transmitting a first random access preamble of a contention based random access procedure, to a network of the wireless communication system;

receiving a random access response including a temporary cell radio network temporary identifier (T-CRNTI), from the network; and

determining whether the received random access response is for the contention based random access procedure according to validity of the T-CRNTI.

17. The method of claim 16, wherein determining whether the received random access response is for the contention based random access procedure according to validity of the T-CRNTI comprises:

determining that the random access response is not for the contention based random access procedure when the T-CRNTI is invalid or set to a predetermined value.

18. The method of claim 17, further comprising:

discontinuing a contention resolution of the contention based random access procedure when determining that the random access response is not for the contention based random access procedure.

19. The method of claim 17, further comprising:

transmitting a second random access preamble of the contention based random access procedure, to the network of the wireless communication system.