Method for enhanced handover detection for mobile networks, a mobile terminal, an access point and program modules therefor

• US 7,840,216 B2
• Filed: 09/23/2005
• Issued: 11/23/2010
• Est. Priority Date: 10/26/2004
• Status: Active Grant

• Current Assignee: Alcatel-Lucent SA (Nokia Corporation)
• Original Assignee: Alcatel SA (Nokia Corporation)
• Inventors: Fiat, Lionel
• Primary Examiner(s): Harper; Vincent P
• Assistant Examiner(s): Figueroa; Marisol
• Application Number:
  US11/233,111
• Publication Number:
  US 20060088005A1
• Time in Patent Office: 1,887 Days
• Field of Search: 370/331, 370/449, 455436-439
• US Class Current: 455/436
• CPC Class Codes: H04W 36/0088 Scheduling hand-off measurements
• CPC Class Codes: H04W 36/30 by measured or perceived connection quality data
• CPC Class Codes: H04W 36/302 due to low signal strength
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

The invention concerns a method for determining the appropriate moment for carrying out a handover of a connection of a mobile terminal in a mobile network whereby if no user related data or no probe data have been sent for a certain time interval from an access point to the mobile terminal, probe data are sent from the access point to said mobile terminal and/or if no user related data or no probe data have been sent for a certain time interval from said mobile terminal to said access point, probe data are sent from the mobile terminal to said access point, a mobile terminal, an access point and program modules therefor.

Claims

1. A method for determining the appropriate moment for carrying out a handover of a connection of a mobile terminal in a mobile network from a first access point to another access point by means of allowing for more frequent power measurements, comprising:

determining, by said first access point, whether user related data and probe data have not been sent for a certain time interval from said first access point to said mobile terminal and, if user related data and probe data have not been sent for the certain time interval from said first access point to said mobile terminal, sending, by said first access point, probe data from said first access point to said mobile terminal;

wherein said mobile terminal uses said probe data sent by said first access point to perform power measurements used for detection of the necessity of the handover of said connection of the mobile terminal from the first access point to another access point.

2. The method of claim 1, further comprising:

determining, by said mobile terminal, whether user related data and probe data have not been sent for a certain time interval from said mobile terminal to said first access point and, if user related data and probe data have not been sent for the certain time interval from said mobile terminal to said first access point, sending, by said mobile terminal, probe data from said mobile terminal to said first access point;

wherein said first access point uses said probe data sent by said mobile terminal to perform power measurements used for detection of the necessity of the handover of said connection of the mobile terminal from the first access point to another access point.

3. A method according to claim 2, wherein said sending of probe data from said first access point to said mobile terminal is initiated through sending said probe data from the mobile terminal to said first access point.

4. A method according to claim 2, wherein said first access point determines the certain time interval taking into account the traffic classes of the user related data that are exchanged between said first access point and said mobile terminal.

5. A method according to claim 2, wherein said sending of probe data from said first access point to said mobile terminal is initiated when a mobile terminal does not receive or transmit data during a certain period of time.

6. The method of claim 1, wherein the probe data is comprised of null frames.

7. A method for determining the appropriate moment for carrying out a handover of a connection of a mobile terminal in a mobile network from a first access point to another access point by means of allowing for more frequent power measurements, comprising:

determining, by said mobile terminal, whether user related data and probe data have not been sent for a certain time interval from said mobile terminal to said first access point and, if user related data and probe data have not been sent for the certain time interval from said mobile terminal to said first access point, sending, by said mobile terminal, probe data from said mobile terminal to said first access point;

wherein said first access point uses said probe data sent by said mobile terminal to perform power measurements used for detection of the necessity of the handover of said connection of the mobile terminal from the first access point to another access point.

8. A mobile terminal for communicating within a mobile network comprising access points and for fast determination of the appropriate moment for carrying out a handover of a connection of a mobile terminal in a mobile network from a first access point to another access point by means of allowing for more frequent power measurements, said mobile terminal comprising:

means for determining whether user related data and probe data have not been sent for a certain time interval from said mobile terminal to said first access point and, if user related data and probe data have not been sent for the certain time interval from said mobile terminal to said first access point, sending, by said mobile terminal, probe data from said mobile terminal to said first access point;

wherein said probe data sent by said mobile terminal are used to perform power measurements, thus allowing the performance of more frequent power measurements that are used for detection of the necessity of the handover of said connection of the mobile terminal from the first access point to another access point.

9. A first access point for communicating within a mobile network comprising at least one mobile terminal and for fast determination of the appropriate moment for carrying out a handover of a connection of a mobile terminal in a mobile network from a first access point to another access point by means of allowing for more frequent power measurements, said access point comprising:

means for determining whether user related data and probe data have not been sent for a certain time interval from said first access point to said mobile terminal and, if user related data and probe data have not been sent for the certain time interval from said first access point to said mobile terminal, sending probe data from said first access point to said mobile terminal;

wherein said probe data sent by said first access point are used to perform power measurements, thus allowing the performance of more frequent power measurements that are used for detection of the necessity of the handover of said connection of the mobile terminal from the first access point to another access point.