Method and apparatus for radio link failure recovery

• US 8,774,135 B2
• Filed: 08/17/2009
• Issued: 07/08/2014
• Est. Priority Date: 08/17/2009
• Status: Active Grant

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola Mobility LLC (Lenovo Group Ltd.)
• Inventors: Narasimha, Murali, Kuchibhotla, Ravi
• Primary Examiner(s): Hailu, Kibrom T
• Assistant Examiner(s): Duffy, James P
• Application Number:
  US12/542,314
• Publication Number:
  US 20110039546A1
• Time in Patent Office: 1,786 Days
• Field of Search: None
• US Class Current: 370/332
• CPC Class Codes: H04W 36/0058 Transmission of hand-off measurement information, e.g. measurement reports
• CPC Class Codes: H04W 36/0088 Scheduling hand-off measurements
• CPC Class Codes: H04W 36/30 by measured or perceived connection quality data
• CPC Class Codes: H04W 36/305 Handover due to radio link failure control signalling for hand-off failure H04W36/0079
• CPC Class Codes: H04W 84/045 using private Base Stations, e.g. femto Base Stations, home Node B

Abstract

A method (300) and apparatus (200) for radio link failure recovery is disclosed. The method may include detecting (320) the presence of an intra-frequency neighbor base station (145) of a serving base station (135). The method may include determining (330) that a radio link parameter of an inter-frequency neighbor base station is better than a threshold. The method may include acquiring (350) system information of the inter-frequency neighbor base station if the intra-frequency neighbor base station is present and if the radio link parameter of the inter-frequency neighbor base station is better than the threshold.

Claims

1. A method in a mobile station, the method comprising:

establishing bi-directional communication between the mobile station and a serving base station;

determining that a radio link parameter of an intra-frequency neighbor base station of the serving base station is better than a first threshold;

determining that a radio link parameter of an inter-frequency neighbor base station is better than a second threshold; and

decoding a system information message of the inter-frequency neighbor base station only if the radio link parameter of the intra-frequency neighbor base station is better than the first threshold and the radio link parameter of the inter-frequency neighbor base station is better than the second threshold;

wherein the first threshold differs from the second threshold.

2. The method according to claim 1, wherein a radio link parameter comprises a reference signal received power parameter.

3. The method according to claim 1 further comprising sending a measurement report to the serving base station, the measurement report indicating that the radio link parameter of the inter-frequency neighbor base station is better than the second threshold.

4. The method according to claim 1 further comprising sending a measurement report to the serving base station, the measurement report indicating that the radio link parameter of the intra-frequency neighbor base station is better than the another first threshold.

5. The method according to claim 1, wherein the radio link parameter of the inter-frequency neighbor base station is computed from at least one of a plurality of measured parameters, the plurality of measured parameters including a measured parameter of the inter-frequency base station.

6. The method according to claim 1 further comprising determining that the mobile station is not allowed to access the intra-frequency neighbor base station, wherein decoding the system information message comprises decoding the system information message of the inter-frequency neighbor base station if the intra-frequency neighbor base station is present, if the radio link parameter of the inter-frequency neighbor base station is better than the second threshold, and if the mobile station is not allowed to access the intra-frequency neighbor base station.

7. The method according to claim 1 further comprising receiving an instruction from the serving base station to acquire the system information message of the inter-frequency neighbor base station.

8. The method according to claim 1 further comprising receiving gap assignments for system information message acquisition if the radio link parameter of the inter-frequency neighbor base station is better than the second threshold.

9. The method according to claim 1 further comprising:

determining radio link failure on the serving base station after decoding the system information message; and

performing reestablishment on the inter-frequency neighbor base station using the decoded system information message in response to determining radio link failure on the serving base station.

10. The method according to claim 9 further comprising receiving buffered data after performing reestablishment.

11. The method according to claim 1, wherein determining a radio link parameter of an intra-frequency neighbor base station of the serving base station is better than a first threshold comprises determining that a radio link parameter of an inaccessible intra-frequency neighbor base station of the serving base station is better than a first threshold.

12. An apparatus comprising:

a wireless communication device housing;

a transceiver coupled to the wireless communication device housing, the transceiver configured to establish bi-directional communication between the mobile station and a serving base station;

a controller coupled to the transceiver, the controller configured to control operations of the apparatus;

a frequency neighbor base station parameter determination module coupled to the controller, the frequency neighbor base station parameter determination module configured to determine that a radio link parameter of an intra-frequency neighbor base station is better than a first threshold and determine that a radio link parameter of the inter-frequency neighbor base station is better than a second threshold; and

a system information message acquisition module coupled to the controller, the system information message acquisition module configured to acquire and decode a system information message of the inter-frequency neighbor base station only if the radio link parameter of the intra-frequency neighbor base station is better than the first threshold and if the radio link parameter of the inter-frequency neighbor base station is better than the second threshold;

wherein the first threshold differs from the second threshold.

13. The apparatus according to claim 12, wherein the controller is configured to send, via the transceiver, a measurement report to the serving base station, the measurement report indicating that the radio link parameter of the inter-frequency neighbor base station is better than the second threshold and indicating that the radio link parameter of the intra-frequency neighbor base station is better than the previously presented first threshold.

14. The apparatus according to claim 12, wherein the controller is configured to determine that the intra-frequency neighbor base station is a home base station.

15. The apparatus according to claim 12,

wherein the controller is configured to determine that a mobile station is not allowed to access the intra-frequency neighbor base station, and

wherein the system information message acquisition module is configured to acquire and decode the system information message of the inter-frequency neighbor base station if the intra-frequency neighbor base station is the radio link parameter of the intra-frequency neighbor base station is better than the first threshold, if the radio link parameter of the inter-frequency neighbor base station is better than the second threshold, and if the mobile station is not allowed to access the intra-frequency neighbor base station.

16. The apparatus according to claim 12, wherein the controller is configured to determine radio link failure on the serving base station after acquiring the system information message and configured to perform reestablishment on the inter-frequency neighbor base station using the acquired system information message in response to determining radio link failure on the serving base station.