Method of Handling Random Access in Wireless Communication System

• US 20150117374A1
• Filed: 10/30/2014
• Published: 04/30/2015
• Est. Priority Date: 10/31/2013
• Status: Active Grant

• Current Assignee: HTC Corporation
• Original Assignee: HTC Corporation
• Inventors: Wu, Chih-Hsiang
• Granted Patent: US 9,794,961 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access
• CPC Class Codes: H04W 74/0891 for synchronized access

Abstract

A method of handling random access for a user equipment of a wireless communication system includes transmitting a plurality of repetitions of a random access preamble to a network of the wireless communication system; and monitoring a physical downlink control channel (PDCCH) in a plurality of random access response windows for receiving a random access response identified by a random access radio network temporary identifier (RA-RNTI) from the network, wherein each of the plurality of random access response windows is corresponding to one of the plurality of repetitions of the random access preamble.

Claims

1. A method of handling random access for a user equipment of a wireless communication system, the method comprising:

transmitting a plurality of repetitions of a random access preamble to a network of the wireless communication system; and

monitoring a physical downlink control channel in a plurality of random access response windows for receiving a random access response identified by a random access radio network temporary identifier (RA-RNTI) from the network, wherein each of the plurality of random access response windows is corresponding to one of the plurality of repetitions of the random access preamble.

2. The method of claim 1, wherein each of the plurality of random access response windows starts at a subframe containing the end of a corresponding preamble repetition plus N subframes.

3. The method of claim 2, wherein N is greater than or equal to a preconfigured value associated with propagation delay and processing time in the wireless communication system, or a value of N is configured statically or dynamically by the network.

4. The method of claim 1, wherein the length of each of the plurality of random access response windows is a preconfigured length or is configured by the network via system information.

5. A method of handling random access for a user equipment of a wireless communication system, the method comprising:

transmitting a plurality of repetitions of a random access preamble to a network of the wireless communication system; and

monitoring a physical downlink control channel in a random access response window which starts at a first subframe containing the end of the first repetition of the random access preamble plus M subframes and ends at a second subframe containing the end of the last repetition of the random access preamble plus (N+W) subframes, for receiving a random access response identified by a random access radio network temporary identifier (RA-RNTI) from the network.

6. The method of claim 5, wherein M and N are greater than or equal to a preconfigured value associated with propagation delay and processing time in the wireless communication system, or values of M and N are configured statically or dynamically by the network.

7. The method of claim 5, wherein W is a preconfigured value or a value of W is configured by the network via system information.

8. A method of handling random access for a user equipment of a wireless communication system, the method comprising:

transmitting a plurality of repetitions of a random access preamble to a network of the wireless communication system; and

monitoring a physical downlink control channel in a random access response window which starts at a subframe containing the end of the first repetition of the random access preamble plus N subframes and has a length X subframes, for receiving a random access response identified by a random access radio network temporary identifier (RA-RNTI) from the network.

9. The method of claim 8, wherein N is greater than or equal to a preconfigured value associated with propagation delay and processing time in the wireless communication system, or a value of N is configured statically or dynamically by the network.

10. The method of claim 8, wherein the length of the random access response window is a preconfigured length or is configured by the network via system information.

11. A method of handling random access for a user equipment of a wireless communication system, the method comprising:

transmitting a plurality of repetitions of a random access preamble to a network of the wireless communication system; and

monitoring a physical downlink control channel in at least one random access response window, each of the at least one random access response window starting at a subframe containing the end of the last repetition of a first number of consecutive preamble repetitions of the plurality of repetitions of the random access preamble plus N subframes and having a length X subframes, for receiving a random access response identified by a random access radio network temporary identifier (RA-RNTI) from the network.

12. The method of claim 11, wherein N is greater than or equal to a preconfigured value associated with propagation delay and processing time in the wireless communication system, or a value of N is configured statically or dynamically by the network.

13. The method of claim 11, wherein the length of the at least one random access response window is a preconfigured length or is configured by the network via system information.

14. The method of claim 11, wherein the first number of consecutive preamble repetitions are a part of or all of the plurality of repetitions of the random access preamble.