Performing network control at active base transceiver stations and a base station controller

• US 7,352,717 B2
• Filed: 05/31/2002
• Issued: 04/01/2008
• Est. Priority Date: 05/31/2002
• Status: Expired due to Fees

• Current Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Original Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Inventors: Yang, Yunsong, Rossetti, David Albert, Vasudevan, Subramanian, Knisely, Douglas N.
• Primary Examiner(s): To; Doris H.
• Assistant Examiner(s): Moore; Ian N.
• Application Number:
  US10/158,219
• Publication Number:
  US 20030223400A1
• Time in Patent Office: 2,132 Days
• Field of Search: 370/330, 370/333, 455/438, 455/439, 455/115.3
• US Class Current: 370/329
• CPC Class Codes: H04W 36/18 for allowing seamless reselection, e.g. soft reselection
• CPC Class Codes: H04W 36/30 by measured or perceived connection quality data
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method for performing network control in wireless communication systems and a network entity for performing the same. The method and network entity pool at least one network parameter at the network entity, from at least two active set base transceiver stations and determine a current status of a mobile in the wireless communication system, using the pooled network parameters. The active set base transceiver stations may include a serving base transceiver station and a target base transceiver station. The network parameter may be a confidence metric and/or an error metric for each of a plurality of hypotheses, a power up/power down signal, and/or a measured signal-to-noise ratio and/or energy parameter of a pilot signal from the mobile. The current status of the mobile to be determined may be the mobile'"'"'s decision to switch to the target base transceiver station transceiver or which base transceiver station transceiver the mobile is currently communication with. The network entity may be a base station controller or a base transceiver station in the active set of base transceiver station transceivers for the mobile in question.

Claims

1. A method of performing network control in which at least one network parameter from at least two active set base transceiver stations are pooled at a base station controller, the method comprising:

determining a current status of a mobile in a wireless communication system, using each of the at least one pooled network parameters, each of the at least one pooled network parameters including a confidence metric for each hypothesis of a plurality of hypotheses that is reported by each of the at least two active set base transceiver stations to the base station controller,

wherein the confidence metric associated with each hypothesis is accumulated after every N slots of at least one frame;

wherein the at least two active set base transceiver stations include a serving base transceiver station and a target base transceiver station and the current status of the mobile is its intention to switch to the target base transceiver station; and

wherein determining the current status of the mobile includes adding the accumulated confidence metric for each of the plurality of hypotheses and selecting the hypothesis with a largest cumulative value of the accumulated confidence metric.

2. The method of claim 1, wherein the at least one network parameter further includes an error metric from the at least two active set base transceiver stations,

wherein determining the current status of the mobile includes calculating a weighted sum of the error metrics from the at least two active set base transceiver stations, and selecting the weighted sum with the minimum cumulative value.

3. The method of claim 1, wherein the at least one network parameter further includes a power up/power down signal from the at least two active set base transceiver stations,

wherein determining the current status of the mobile includes weighting status information from the at least two active set base transceiver stations, and wherein

status information supplying a power down signal is weighted greater than status information supplying a power up signal.

4. The method of claim 1, wherein the at least one network parameter further includes a signal-to-noise ratio of a pilot signal from the mobile measured by the at least two active set base transceiver stations,

wherein determining the current status of the mobile includes weighting status information from the at least two active set base transceiver stations, and wherein

status information supplying a higher signal-to-noise ratio of the pilot signal from the mobile is weighted greater than status information supplying a lower signal-to-noise ratio of the pilot signal from the mobile.

5. The method of claim 1, wherein the at least one network parameter further includes an energy parameter of a pilot signal from the mobile measured by the at least two active set base transceiver stations,

wherein determining the current status of the mobile includes weighting status information from the at least two active set base transceiver stations, and wherein

status information supplying a higher energy parameter of the pilot signal from the mobile is weighted greater than status information supplying a lower energy parameter of the pilot signal from the mobile.

6. The method of claim 1, wherein the at least one network parameter further includes a quality indicator from another channel being concurrently transmitted by the mobile,

wherein determining the current status of the mobile includes weighting a determination of mobile status by the at least two active base transceiver stations, and wherein

a determination by at least one of the at least two active set base transceiver stations receiving the another channel with a better quality indicator is weighted higher than a determination by at least another of the at least two active set base transceiver stations receiving the another channel with a poorer quality indicator.

7. The method of claim 6, wherein the quality indicator is a cyclic redundancy check (CRC) or a frame quality indicator.

8. The method of claim 6, wherein the another channel is a reverse fundamental channel (R-FCH) or a reverse dedicated control channel (R-DCCH).

9. The method of claim 1, wherein the wireless communications system includes system equipment and the system equipment is the base station controller.

10. The method of claim 1, wherein the wireless communications system includes system equipment and the system equipment is one of the at least two active set base transceiver stations.

11. A network entity for performing network control in a wireless communication system, comprising:

a processor at a base station controller for pooling at least one network parameter from at least two active set base transceiver stations and determining a current status of a mobile in the wireless communication system, using the pooled network parameters, the pooled network parameters including a confidence metric for each hypothesis of a plurality of hypotheses that is reported by each of the at least two active set base transceiver stations to the base station controller, the confidence metric associated with each hypothesis is accumulated after every N slots of at least one frame, the at least two active set base transceiver stations include a serving base transceiver station and a target base transceiver station and the current status of the mobile is its intention to switch to the target base transceiver station, and

said processor determining the current status of the mobile by adding the accumulated confidence metric for each of the plurality of hypotheses and selecting the hypothesis with a largest cumulative value of the accumulated confidence metric.

12. The network entity of claim 11, wherein the at least one network parameter further includes an error metric from the at least two active set base transceiver stations,

said processor determining the current status of the mobile by calculating a weighted sum of the error metrics from the at least two active set base transceiver stations and selecting the weighted sum with the minimum cumulative value.

13. The network entity of claim 11, wherein the at least one network parameter further includes a power up/power down signal from the at least two active set base transceiver stations,

said processor determining the current status of the mobile by weighting status information from the at least two active set base transceiver stations, and

status information supplying a power down signal is weighted greater than status information supplying a power up signal.

14. The network entity of claim 11, wherein the at least one network parameter further includes a signal-to-noise ratio of a pilot signal from the mobile measured by the at least two active set base transceiver stations,

said processor determining the current status of the mobile by weighting status information from the at least two active set base transceiver stations, and wherein

status information supplying a higher signal-to-noise ratio of the pilot signal from the mobile is weighted greater than status information supplying a lower signal-to-noise ratio of the pilot signal from the mobile.

15. The network entity of claim 11, wherein the at least one network parameter further includes an energy parameter of a pilot signal from the mobile measured by the at least two active set base transceiver stations,

said processor determining the current status of the mobile by weighting status information from the at least two active set base transceiver stations and wherein

status information supplying a higher energy parameter of the pilot signal from the mobile is weighted greater than status information supplying a lower energy parameter of the pilot signal from the mobile.

16. The network entity of claim 11, wherein the at least one network parameter further includes a quality indicator from another channel being concurrently transmitted by the mobile,

said processor determining the current status of the mobile by weighting a determination of mobile status by the at least two active set base transceiver stations, and wherein

a determination by at least one of the at least two active set base transceiver stations receiving the another channel with a better quality indicator is weighted higher than a determination by at least another of the at least two active set base transceiver stations receiving the another channel with a poorer quality indicator.

17. The network entity of claim 16, wherein the quality indicator is a cyclic redundancy check (CRC) or a frame quality indicator.

18. The network entity of claim 16, wherein the another channel is a reverse fundamental channel (R-FCH) or a reverse dedicated control channel (R-DCCH).

19. The network entity of claim 11, wherein the network entity is the base station controller.

20. The network entity of claim 11, wherein the network entity is one of the at least two active set base transceiver stations.