Discovery of neighbour cell beacon frequencies in mobile networks

• US 20060240829A1
• Filed: 03/08/2006
• Published: 10/26/2006
• Est. Priority Date: 04/26/2005
• Status: Active Grant

• Current Assignee: Illuminate Technologies, LLC
• Original Assignee: Agilent Technologies, Inc.
• Inventors: Hurst, Michael
• Granted Patent: US 7,706,798 B2
• Time in Patent Office: Days
• US Class Current: 455/436
• CPC Class Codes: H04B 17/318 Received signal strength
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 36/0085 Hand-off measurements
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 92/12 between access points and access point controllers

Abstract

In order to discover at least part of a frequency list used by an active wireless device in a cellular communications network for neighbour cell signal measurements, measurement reports are extracted from messages carrying reports of measurements relating to propagation of wireless signals between the network and the device. Additional information (such as identity of sections of the network adjacent to a current serving cell for the device) is extracted from other messages, and the extracted measurement reports and additional information are combined to discover the required frequency list.

Claims

1. A method of discovering at least part of a frequency list used by an active wireless device in a cellular communications network for neighbour cell signal measurements, comprising:

monitoring at least one signalling link carrying messages between two elements of the communications network;

selecting monitored messages of a first type carrying reports of measurements relating to propagation of wireless signals between the network and the device;

extracting reports of measurements from the messages of the first type, independently of operation of said two elements of the network;

selecting monitored messages of a second type carrying data other than reports of such measurements;

extracting information from the messages of the second type; and

combining measurement reports extracted from the messages of the first type with the information extracted from the messages of the second type to discover at least part of the neighbour cell frequency list used by the wireless device for neighbour cell measurements.

2. The method of claim 1, wherein reports of measurements extracted from the messages of the first type relate to received signal strength of beacon transmissions from at least one neighbour cell and identity of the neighbour cell.

3. The method of claim 2, wherein identity of the neighbour cell is indicated indirectly by an index to a neighbour cell frequency list.

4. The method of claim 1, wherein the messages of the first type comprise DTAP Measurement Report messages.

5. The method of claim 1, wherein the messages of the second type are messages generated by the network in response to measurement values contained in messages of the first type.

6. The method of claim 1, wherein the messages of the second type contain information relating to identity of sections of the network adjacent to a current serving cell for the device.

7. The method of claim 1, wherein the messages of the second type are DTAP Handover Command messages.

8. Apparatus for discovering at least part of a frequency list used by an active wireless device in a cellular communications network for neighbour cell signal measurements, comprising:

a monitor for monitoring at least one signalling link carrying messages between two elements of the communications network;

a selector for selecting monitored messages of a first type carrying reports of measurements relating to propagation of wireless signals between the network and the device and extracting reports of measurements from the messages of the first type, independently of operation of said two elements of the network;

a selector for selecting monitored messages of a second type carrying data other than reports of such measurements and extracting information from the messages of the second type; and

a combiner for combining measurement reports extracted from the messages of the first type with the information extracted from the messages of the second type to discover at least part of the neighbour cell frequency list used by the wireless device for neighbour cell measurements.