Method for performing network control in wireless communication system and network entity for performing the same

• US 20030223400A1
• Filed: 05/31/2002
• Published: 12/04/2003
• Est. Priority Date: 05/31/2002
• Status: Active Grant

• 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.
• Granted Patent: US 7,352,717 B2
• Time in Patent Office: Days
• US Class Current: 370/346
• 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 by system equipment of a wireless communication system, the method comprising the step of:

pooling at least one network parameter at the system equipment, 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.

2. The method of claim 1, wherein the at least one network parameter is a confidence metric for each of a plurality of hypotheses from the at least two active set base transceiver stations, 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,

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

3. The method of claim 1, wherein the at least one network parameter is an error metric for each of a plurality of hypotheses from the at least two active set base transceiver stations, 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,

wherein determining the current status of the mobile includes calculatinga weighted sum of the error metrics for each of the plurality of hypotheses, from the at least two active set base transceiver stations, and selecting the hypothesis with the minimum cumulative value.

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

wherein determining the current status of the mobile includes weighting status information from a base transceiver station supplying a power down signal greater than status information from a base transceiver station supplying a power up signal.

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

wherein determining the current status of the mobile includes weighting status information from a base transceiver station supplying a higher signal-to-noise ratio of the pilot signal from the mobile greater than status information from a base transceiver station supplying a lower signal-to-noise ratio of the pilot signal from the mobile.

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

wherein determining the current status of the mobile includes weighting status information from a base transceiver station supplying a higher energy parameter of the pilot signal from the mobile greater than status information from a base transceiver station supplying a lower energy parameter of the pilot signal from the mobile.

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

wherein determining the current status of the mobile includes weighting a determination of mobile status by a base transceiver station receiving the another channel with a better quality indicator, higher than a determination by another base transceiver station receiving the another channel with a poorer quality indicator.

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

9. The method of claim 7, wherein the another channel is a reverse fundamental channel (R-FCH) or a reverse dedicated control channel (R-DCCH).

10. The method of claim 1, wherein the system equipment is a base station controller.

11. The method of claim 1, wherein the system equipment is one of the at least two active set base transceiver stations.

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

a processor 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.

13. The network entity of claim 12, wherein the at least one network parameter is a confidence metric for each of a plurality of hypotheses from the at least two active set base transceiver stations, 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,

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

14. The network entity of claim 12, wherein the at least one network parameter is an error metric for each of a plurality of hypotheses from the at least two active set base transceiver stations, 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,

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

15. The network entity of claim 12, wherein the at least one network parameter is a power up/power down signal from the at least two active set base transceiver stations, 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,

said processor determining the current status of the mobile by weighting status information from a base transceiver station supplying a power down signal greater than status information from a base transceiver station supplying a power up signal.

16. The network entity of claim 12, wherein the at least one network parameter is a signal-to-noise ratio of a pilot signal from the mobile measured by the at least two active set base transceiver stations, 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,

said processor determining the current status of the mobile by weighting status information from a base transceiver station supplying a higher signal-to-noise ratio of the pilot signal from the mobile greater than status information from a base transceiver station supplying a lower signal-to-noise ratio of the pilot signal from the mobile.

17. The network entity of claim 12, wherein the at least one network parameter is an energy parameter of a pilot signal from the mobile measured by the at least two active set base transceiver stations, 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,

said processor determining the current status of the mobile by weighting status information from a base transceiver station supplying a higher energy parameter of the pilot signal from the mobile greater than status information from a base transceiver station supplying a lower energy parameter of the pilot signal from the mobile.

18. The network entity of claim 12, wherein the at least one network parameter is a quality indicator from another channel being concurrently transmitted by the mobile, 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,

said processor determining the current status of the mobile by weighting a determination of mobile status by a base transceiver station receiving the another channel with a better quality indicator, higher than a determination by another base transceiver station receiving the another channel with a poorer quality indicator.

19. The network entity of claim 18, wherein the quality indicator is a cyclic redundancy check (CRC) or a frame quality indicator.

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

21. The network entity of claim 12, wherein the network entity is a base station controller.

22. The network entity of claim 12, wherein the network entity is one of the at least two active set base transceiver stations.