Power loop control method and apparatus

• US 8,588,839 B2
• Filed: 12/16/2009
• Issued: 11/19/2013
• Est. Priority Date: 12/16/2009
• Status: Expired due to Fees

• Current Assignee: Optis Cellular Technology LLC (Brevet Capital)
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Blomgren, Mats, Brus, Linda
• Primary Examiner(s): Nguyen, Hai V
• Application Number:
  US12/639,032
• Publication Number:
  US 20110143804A1
• Time in Patent Office: 1,434 Days
• Field of Search: 455/522
• US Class Current: 455/522
• CPC Class Codes: H04W 36/18 for allowing seamless reselection, e.g. soft reselection
• CPC Class Codes: H04W 52/12 Outer and inner loops
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/241 taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo
• CPC Class Codes: H04W 52/386 centralized, e.g. when the radio network controller or equivalent takes part in the power control
• CPC Class Codes: H04W 52/40 during macro-diversity or soft handoff

Abstract

A method for implementing power loop control at a RBS controlled by an RNC includes receiving an SIR target at the RBS which is determined by the RNC for a mobile station in communication with the RBS. In a first mode, one or more transmit power control commands are generated at the RBS for issuance to the mobile station based on the SIR target received from the RNC. In a second mode, one or more transmit power control commands are generated at the RBS for issuance to the mobile station based on an SIR target determined by the RBS for the mobile station instead of the SIR target received from the RNC. Also in the second mode, artificial mobile station connection quality information is reported from the RBS to the RNC so that the SIR target determined by the RNC is adjusted in accordance with the SIR target determined by the RBS.

Claims

1. A method of implementing power loop control at a radio base station controlled by a radio network controller, comprising:

receiving an SIR target at the radio base station which is determined by the radio network controller for a mobile station in communication with the radio base station;

in a first mode, generating one or more transmit power control commands at the radio base station for issuance to the mobile station based on the SIR target received from the radio network controller; and

in a second mode, generating one or more transmit power control commands at the radio base station for issuance to the mobile station based on an SIR target determined by the radio base station for the mobile station instead of the SIR target received from the radio network controller and reporting artificial mobile station connection quality information from the radio base station to the radio network controller so that the SIR target determined by the radio network controller is adjusted in accordance with the SIR target determined by the radio base station.

2. The method of claim 1, comprising determining the artificial mobile station connection quality information by the radio base station irrespective of actual mobile station connection quality.

3. The method of claim 2, wherein the artificial mobile station connection quality information is an artificial number of retransmission attempts determined by the radio base station irrespective of a number of actual retransmission attempts made by the mobile station.

4. The method of claim 3, comprising:

setting the artificial number of retransmission attempts greater than a target number of retransmission attempts determined by the radio network controller for the mobile station if the SIR target determined by the radio base station is greater than the SIR target received from the radio network controller; and

otherwise setting the artificial number of retransmission attempts less than or equal to the target number of retransmission attempts.

5. The method of claim 2, wherein the artificial mobile station connection quality information is an artificial block error rate determined by the radio base station irrespective of an actual block error rate associated with the mobile station.

6. The method of claim 1, wherein the first mode corresponds to the mobile station being in full soft handover.

7. The method of claim 6, comprising operating in the first mode responsive to the mobile station or the radio network controller signaling full soft handover to the radio base station.

8. The method of claim 6, comprising operating in the first mode responsive to the radio base station receiving an SIR target from the radio network controller which falls outside an expected range.

9. The method of claim 6, comprising operating in the first mode responsive to the mobile station failing to retransmit data when instructed to do so by the radio base station.

10. The method of claim 1, wherein the second mode corresponds to the mobile station being in partial soft handover or no soft handover.

11. The method of claim 10, comprising operating in the second mode responsive to the mobile station or the radio network controller signaling partial soft handover or no soft handover to the radio base station.

12. The method of claim 10, comprising operating in the second mode responsive to a retransmission process supported by the radio base station indicating the radio base station is the only radio base station controlled by the radio network controller that is receiving data from the mobile station.

13. A radio base station, comprising a baseband processor configured to:

process an SIR target received from a radio network controller that controls the radio base station, the SIR target determined by the radio network controller for a mobile station in communication with the radio base station;

in a first mode, generate one or more transmit power control commands for issuance to the mobile station based on the SIR target received from the radio network controller; and

in a second mode, generate one or more transmit power control commands for issuance to the mobile station based on an SIR target determined at the radio base station for the mobile station instead of the SIR target received from the radio network controller and report artificial mobile station connection quality information to the radio network controller so that the SIR target determined by the radio network controller is adjusted in accordance with the SIR target determined at the radio base station.

14. The radio base station of claim 13, the baseband processor is configured to determine the artificial mobile station connection quality information irrespective of actual mobile station connection quality.

15. The radio base station of claim 14, wherein the artificial mobile station connection quality information is an artificial number of retransmission attempts determined by the baseband processor station irrespective of a number of actual retransmission attempts made by the mobile station.

16. The radio base station of claim 15, wherein the baseband processor is configured to set the artificial number of retransmission attempts greater than a target number of retransmission attempts determined by the radio network controller for the mobile station if the SIR target determined by the radio base station is greater than the SIR target received from the radio network controller, and otherwise set the artificial number of retransmission attempts less than or equal to the target number of retransmission attempts.

17. The radio base station of claim 14, wherein the artificial mobile station connection quality information is an artificial block error rate determined by the baseband processor irrespective of an actual block error rate associated with the mobile station.

18. The radio base station of claim 13, wherein the first mode corresponds to the mobile station being in full soft handover.

19. The radio base station of claim 18, wherein the baseband processor is configured to operate in the first mode responsive to the mobile station or the radio network controller signaling full soft handover to the radio base station.

20. The radio base station of claim 18, wherein the baseband processor is configured to operate in the first mode responsive to an SIR target received from the radio network controller falling outside an expected range.

21. The radio base station of claim 18, wherein the baseband processor is configured to operate in the first mode responsive to the mobile station failing to retransmit when instructed to do so by the radio base station.

22. The radio base station of claim 13, wherein the second mode corresponds to the mobile station being in partial soft handover or no soft handover.

23. The radio base station of claim 22, wherein the baseband processor is configured to operate in the second mode responsive to the mobile station or the radio network controller signaling partial soft handover or no soft handover to the radio base station.

24. The radio base station of claim 22, wherein the baseband processor is configured to operate in the second mode responsive to a retransmission process supported by the baseband processor indicating the radio base station is the only radio base station controlled by the radio network controller that is receiving data from the mobile station.