Method and apparatus for managing air interface noise in a wireless communication system

• US 8,233,899 B1
• Filed: 02/24/2011
• Issued: 07/31/2012
• Est. Priority Date: 02/24/2011
• Status: Active Grant

• Current Assignee: Sprint Spectrum LLC (Deutsche Telekom AG)
• Original Assignee: Sprint Spectrum LP (Deutsche Telekom AG)
• Inventors: Oroskar, Siddharth S., Vargantwar, Sachin R., Shah, Maulik K., Shetty, Manoj
• Primary Examiner(s): Corsaro, Nick
• Assistant Examiner(s): Ajayi, Joel
• Application Number:
  US13/034,193
• Time in Patent Office: 523 Days
• Field of Search: 455/432.1, 455/436, 455/63.1
• US Class Current: 455/432.1
• CPC Class Codes: H04L 1/0002 by adapting the transmission rate
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 2001/0093 Point-to-multipoint
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 24/08 Testing, supervising or monitoring using real traffic
• CPC Class Codes: H04W 48/18 Selecting a network or a communication service
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/283 Power depending on the position of the mobile
• CPC Class Codes: H04W 52/343 taking into account loading or congestion level

Abstract

Disclosed is a method and system to help reduce the extent of roaming or use of lower priority coverage areas in a wireless communication system, by selectively managing the level of noise in a preferred coverage area. A network entity will detect that a particular coverage area has a high rate or roaming or that another coverage area (e.g., a collocated or adjacent coverage area) has a high rate of use, and the network entity will responsively reduce a noise threshold in the particular coverage area so as to then tolerate less noise in the coverage area before taking affirmative action to reduce the level of noise, and thus optimally to reduce the extent of roaming or use of less preferred coverage.

Claims

1. A method for managing air interface noise in a particular coverage area of a wireless communication system, wherein the wireless communication system applies a reverse noise threshold for the particular coverage area as a basis to manage reverse transmission power of served devices in the particular coverage area, wherein when the wireless communication system determines that reverse noise in the particular coverage area meets the reverse noise threshold, the wireless communication system causes at least one device served in the particular coverage area to reduce reverse transmission power, wherein reducing reverse transmission power in the particular coverage area helps to reduce reverse noise in the particular coverage area, the method comprising:

a radio access network (RAN) entity detecting threshold usage of wireless communication service in a coverage area other than the particular coverage area, wherein the RAN entity comprises at least one of a base transceiver station, a base station controller, and a mobile switching center, and wherein detecting threshold usage of wireless communication service in the coverage area other than the particular coverage area comprises at least one of (i) programmatically determining, based on records of handoff of devices from the particular coverage area to the other coverage area, that there has been at least a threshold extent of handing off from the particular coverage area to the other coverage area and (ii) when the particular coverage area is a home coverage area and the other coverage area is a roaming coverage area, programmatically determining, based on roaming records, that there has been at least a threshold extent of roaming, in the roaming coverage area, of one or more devices that could instead operate in the home coverage area; and

based on at least the detecting, the RAN entity decreasing the reverse noise threshold for the particular coverage area from a first reverse noise threshold down to a second reverse noise threshold, wherein (a) when the reverse noise threshold for the particular coverage area is the first reverse noise threshold and the wireless communication system determines that the reverse noise in the particular coverage area is high enough to meet the first reverse noise threshold, the wireless communication system causes the at least one device served in the particular coverage area to reduce reverse transmission power, and (b) when the reverse noise threshold for the particular coverage area is the second reverse noise threshold and the wireless communication system determines that reverse noise in the particular coverage area meets the second reverse noise threshold even when the reverse noise is not high enough to meet the first reverse noise threshold, the wireless communication system causes the at least one device served in the particular coverage area to reduce reverse transmission power,

wherein causing the at least one device served in the particular coverage area to reduce reverse transmission power comprises wirelessly transmitting a control signal for receipt by the at least one device to cause the at least one device to reduce reverse transmission power, thereby helping to reduce reverse noise in the particular coverage area.

2. The method of claim 1, wherein the control signal causes the at least one device served in the particular coverage area to reduce reverse data rate and correspondingly to reduce reverse transmission power.

3. The method of claim 2, wherein the particular coverage area is provided by a home wireless service provider and the other coverage area is provided by a roaming partner of the home wireless service provider.

4. The method of claim 2, wherein the particular coverage area is provided by a wireless service provider and has a first priority level, and wherein the other coverage area is provided the wireless service provider and has a second priority level lower than the first priority level.

5. The method of claim 2, wherein the decreasing is done by the RAN entity automatically in response to the detecting.

6. The method of claim 2, wherein detecting the threshold usage of wireless communication service in the other coverage area comprises:

programmatically determining, based on the records of handoff of devices from the particular coverage area to the other coverage area, that there has been at least the threshold extent of handing off from the particular coverage area to the other coverage area.

7. The method of claim 2, wherein detecting the threshold usage of wireless communication service in the other coverage area comprises:

matching roaming records with records of devices experiencing dropped calls in the particular coverage area, so as to produce data indicating an extent of incidents in which dropped calls in the particular coverage area led to usage in the other coverage area.

8. The method of 2, wherein the control signal comprises a Boolean value of a Reverse Activity Bit (RAB).

9. A method for managing air interface noise in a wireless communication system, wherein when the wireless communication system determines that reverse noise in a coverage area of the wireless communication system meets a reverse noise threshold, the wireless communication system causes at least one device served in the coverage area to reduce reverse data rate, wherein reducing reverse data rate in the coverage area helps to reduce reverse noise in the coverage area, the method comprising:

a radio access network (RAN) entity determining a roam-away level for the coverage area, wherein the RAN entity comprises at least one of a base transceiver station, a base station controller, and a mobile switching center, and wherein determining the roam-away level for the coverage area comprises at least one of (i) programmatically determining, based on records of handoff of devices from the coverage area to one or more roaming network coverage areas, an extent to which devices have handed off from the coverage area to the one or more roaming network coverage areas and (ii) programmatically matching roaming records with records of devices experiencing dropped calls in the coverage area, so as to determine an extent of incidents in which dropped calls in the coverage area led to roaming;

the RAN entity using the determined roam-away level as a basis to set a reverse noise threshold for the coverage area, wherein the RAN entity is arranged to set the reverse noise threshold at first reverse noise threshold level when the roam-away level is a first roam-away level and the RAN entity sets the reverse noise threshold at a second reverse noise threshold level when the roam-away level is a second roam-away level, wherein the second roam-away level is higher than the first roam-away level, and the second reverse noise threshold level is lower than the first reverse noise threshold level; and

the wireless communication system using the set reverse noise threshold as a basis to trigger adjustment in reverse data rate of served devices in the coverage area and thus helps to reduce noise in the coverage area, wherein using the set reverse noise threshold as a basis to trigger adjustment in reverse data rate of served devices in the coverage area comprises (a) detecting that reverse noise in the coverage area meets the set reverse noise threshold and (b) responsive to detecting that reverse noise in the coverage area meets the set reverse noise threshold, broadcasting in the coverage area a value that causes the at least one device served in the coverage area to reduce reverse data rate.

10. The method of claim 9, wherein the roam-away level is an extent of roaming from a home network operated by a service provider to a roaming network operated by another service provider.

11. The method of claim 9, further comprising maintaining correlation data that correlates various roam-away levels with reverse noise thresholds, wherein using the determined roam-away level as a basis to set the reverse noise threshold comprises:

referring to the correlation data to determine a particular reverse noise threshold level corresponding with the determined roam-away level; and

setting the reverse noise threshold at the determined particular reverse noise threshold level.

12. The method of claim 9, wherein determining the roam-away level for the coverage area comprises:

programmatically determining, based on the records of handoff of devices from the coverage area to the one or more roaming network coverage areas, the extent to which devices have handed off from the coverage area to the one or more roaming network coverage areas.

13. The method of claim 9, wherein determining the roam-away level for the coverage area comprises:

programmatically matching the roaming records with the records of devices experiencing dropped calls in the coverage area, so as to produce data indicating the extent of incidents in which dropped calls in the coverage area led to roaming; and

using the data as a basis to determine the roam-away level.

14. The method of claim 9, wherein the value is a Boolean value of a Reverse Activity Bit (RAB).

15. A non-transitory computer-readable medium having stored thereon instructions executable by a processor to carry out functions comprising:

determining an extent to which devices in a coverage area of a home network have roamed from the coverage area of the home network to one or more roaming networks, wherein determining the extent to which devices in the coverage area of the home network have roamed from the coverage area of the home network to the one or more roaming networks comprises (i) matching historical roaming records with records of devices experiencing dropped calls in the coverage area of the home network, so as to produce data indicating incidents in which dropped calls in the coverage area led to roaming and (ii) using the data as a basis to determine the extent; and

using the determined extent as a basis to set a reverse noise threshold that the home network will then apply as a basis to trigger adjustment in reverse data rate of transmissions in the coverage area of the home network, wherein applying the reverse noise threshold as the basis to trigger adjustment in the reverse data rate of transmissions in the coverage area of the home network comprises (a) making a determination of whether reverse noise in the coverage area of the home network is high enough to meet the reverse noise threshold, (b) when the determination is that the reverse noise in the coverage area of the home network is high enough to meet the reverse noise threshold, then broadcasting in the coverage area of the home network a first value that causes served devices in the coverage area of the home network to reduce their reverse data rates, and (c) when the determination is that the reverse noise in the coverage area of the home network is not high enough to meet the reverse noise threshold, then broadcasting in the coverage area of the home network a second value that causes served devices in the coverage area of the home network to increase their reverse data rates.

16. The non-transitory computer-readable medium of claim 15, wherein the non-transitory computer-readable medium is part of the home network.

17. The non-transitory computer-readable medium of claim 15, wherein using the determined extent as a basis to set the reverse noise threshold comprises:

referring to correlation data to determine a particular reverse noise threshold corresponding with the determined extent; and

setting the reverse noise threshold to be the determined particular reverse noise threshold.