Method and system for discontinuous reception de-synchronization detection

• US 8,315,214 B2
• Filed: 05/18/2007
• Issued: 11/20/2012
• Est. Priority Date: 05/18/2007
• Status: Expired due to Fees

• Current Assignee: Blackberry Limited
• Original Assignee: Blackberry Limited
• Inventors: Womack, James Earl, Cai, Zhijun, Wu, Wei
• Primary Examiner(s): Hu, Jinsong
• Assistant Examiner(s): Nguyen, Michael
• Application Number:
  US11/750,740
• Publication Number:
  US 20080285509A1
• Time in Patent Office: 2,013 Days
• Field of Search: 370/329, 370/350, 455/13.2, 455/208
• US Class Current: 370/329
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/16 in which the return channel carries supervisory signals, e.g. repetition request signals
• CPC Class Codes: H04W 76/28 Discontinuous transmission [DTX]; Discontinuous reception [DRX]

Abstract

A method and apparatus for discontinuous reception desynchronization detection between an enhanced Node B and a user equipment, the method having the steps of: waiting for a predefined event to occur; and upon the predefined event occurring, sending a message from one of the enhanced Node B and the user equipment to the other of the enhanced Node B and user equipment, wherein the message contains one of a request for discontinuous reception period information or discontinuous reception period information, the discontinuous reception period information or discontinuous reception period information being utilized to detect desynchronization.

Claims

1. A method for discontinuous reception desynchronization detection between an enhanced Node B and a user equipment, the method comprising the steps of:

waiting for the expiration of a timer;

sending a message from the enhanced Node B to the user equipment upon expiration of said timer, wherein said message contains a request for discontinuous reception period information of the user equipment;

detecting the discontinuous reception desynchronization if a response from the user equipment to the enhanced Node B contains one of a desynchronization detected flag or discontinuous reception period information of the user equipment, that does not match discontinuous reception period information of the enhanced Node B; and

restarting said timer if data is received at the enhanced Node B for the user equipment prior to the expiration of said timer.

2. The method of claim 1, wherein said timer is on the enhanced Node B.

3. The method of claim 1, wherein the method further comprises the step of waiting for the response from the user equipment.

4. The method of claim 1, wherein the message comprises a discontinuous reception period information of the enhanced Node B.

5. The method of claim 1, wherein said message requests one or more of a channel quality update, a transmission adjustment update, or a message for desynchronization detection.

6. The method of claim 1, wherein the method further comprises the step of comparing the current discontinuous reception period information of the enhanced Node B with the discontinuous reception period information of the user equipment.

7. The method of claim 6, wherein the response from the user equipment to the enhanced Node B containing the desynchronization detected flag is in response to said message, upon detection of desynchronization at the user equipment.

13. The method of claim 1, wherein detecting the discontinuous reception desynchronization further comprises attempting desynchronization recovery.

8. An enhanced Node B adapted to detect discontinuous reception desynchronization between the enhanced Node B and a user equipment, the enhanced Node B comprising:

a communications subsystem being configured to wait for the expiration of a timer;

the communications subsystem being configured to send a message, upon expiration of said timer, from the enhanced Node B to the user equipment,

wherein said message contains a request for discontinuous reception period information of the user equipment;

the communications subsystem being configured to detect the discontinuous reception desynchronization if a response from the user equipment contains one of a desynchronization detected flag or discontinuous reception period information of the user equipment, that does not match discontinuous reception period information of the enhanced Node B; and

the communications subsystem being configured to restart said timer if data is received at the enhanced Node B for the user equipment prior to the expiration of said timer.

9. The enhanced Node B of claim 8 further comprising the communications subsystem being configured to wait for the response from the user equipment.

10. The enhanced Node B of claim 8, wherein said message contains a request of one or more of a channel quality update, a transmission adjustment update, or a desynchronization detection message.

14. The enhanced Node B of claim 8, wherein the communications subsystem is further configured to attempt desynchronization recovery.

11. A user equipment adapted to detect discontinuous reception desynchronization between an enhanced Node B and the user equipment, the user equipment comprising:

a communications subsystem being configured to wait for the expiration of a timer, the communications subsystem being configured to receive a message upon expiration of said timer;

if the received message contains a request for discontinuous reception period information of the user equipment, the communications subsystem being configured to send an outgoing message from the user equipment to the enhanced Node B, said outgoing message containing discontinuous reception period information of the user equipment;

if the received message contains discontinuous reception period information of the enhanced Node B, the communications subsystem being configured to detect discontinuous reception desynchronization when discontinuous reception period information received from the enhanced Node B does not match discontinuous reception period information of the user equipment and to send an outgoing message from the user equipment to the enhanced Node B, said outgoing message containing a desynchronization detected flag; and

the communications subsystem being configured to reset said timer if data is received by the user equipment.

12. The user equipment of claim 11, wherein said message contains one or more of a channel quality update, a transmission adjustment update, or a desynchronization detection message.

15. The user equipment of claim 11, wherein the communications subsystem is further configured to attempt desynchronization recovery.