Position assisted handoff within a wireless communications network

• US 6,711,408 B1
• Filed: 02/05/2000
• Issued: 03/23/2004
• Est. Priority Date: 02/05/2000
• Status: Expired due to Term

• Current Assignee: Ericsson, Inc. (Telefonaktiebolaget LM Ericsson)
• Original Assignee: Ericsson, Inc. (Telefonaktiebolaget LM Ericsson)
• Inventors: Raith, Alex Krister
• Primary Examiner(s): Tran, Sinh
• Assistant Examiner(s): Nguyen, Huy D
• Application Number:
  US09/498,785
• Time in Patent Office: 1,508 Days
• Field of Search: 455/436, 455/438, 455/440, 455/441, 455/456.1, 455/456.3, 342/450, 342/457, 340/990, 340/825.36, 340/825.49, 340/988
• US Class Current: 455/440
• CPC Class Codes: H04W 36/32 by location or mobility data, e.g. speed data
• CPC Class Codes: H04W 36/322 by location data

Abstract

A method of using historic data from previous calls made from mobile terminals within a wireless communications network to predict future call management options to maximize quality. The method may include determining a route traveled by a mobile terminal in a mobile communication network by determining the geographic position of the mobile terminal at a plurality of time instants as the mobile terminal is moving within the network. The positions are stored in a memory, and a route is determined when a predetermined number of locations occur within a predetermined area. Once a route is determined, subsequent mobile terminals moving through the network are monitored and their paths are compared with the predetermined routes. The mobile terminal is considered to be moving along the predetermined route when the path matches any of the predetermined routes. The projected path of the mobile terminal along the identified route is used to assist in planning and executing call handoffs for the mobile terminal in an efficient manner.

Claims

1. A method for determining a route traveled by a mobile terminal in a mobile communication network comprising:

determining the geographic position of one or more mobile terminals at a plurality of time instants;

storing said plurality of geographic positions in a memory; and

determining, based on said plurality of geographic positions, one or more routes traveled by said mobile terminals;

wherein said determining one or more routes traveled by said mobile terminals comprises aggregating position data reported by a plurality of said mobile terminals.

2. The method of claim 1 wherein said determining the geographic position of one or more mobile terminals comprises determining the geographic position of one or more mobile terminals while said mobile terminals are active in a call.

3. The method of claim 1 wherein said determining the geographic position of one or more mobile terminals comprises determining the geographic position of one or more mobile terminals based on a signal transmitted by said one or more mobile terminals.

4. The method of claim 1 wherein said one or more mobile terminals include a position estimating device for determining the corresponding mobile terminal'"'"'s geographic position.

5. The method of claim 4 wherein said determining the geographic position of one or more mobile terminals comprises said position estimating device generating geographic position information and transmitting said geographic position information from said one or more mobile terminals to said mobile communication network.

6. The method of claim 5 wherein said determining the geographic position of one or more mobile terminals comprises said mobile communication network further processing said geographic position information after receipt from said one or more mobile terminals.

7. A method for matching the path traveled by a mobile terminal in a mobile communication network to a predetermined route stored in memory, comprising:

determining the current path traveled by said mobile terminal based on the position of said mobile terminal at a plurality of time instants;

defining predetermined routes by aggregating position data reported by a plurality of mobile terminals;

comparing said current path traveled by said mobile terminal to one or more predetermined routes stored in said memory; and

determining whether said current path matches one of said predetermined routes stored in said memory based on said comparison of said current path to said predetermined routes.

8. The method according to claim 7 wherein said comparing said current path traveled by said mobile terminal to said one or more predetermined routes stored in said memory comprises computing a metric representing the correlation between said current path of said mobile terminal and said predetermined route.

9. The method of claim 7, wherein said comparing said current path traveled by said mobile terminal to said one or more predetermined routes stored in said memory comprises comparing said current path traveled by said mobile terminal to said one or more predetermined routes stored in said memory comprises over a predefined distance.

10. The method of claim 7 wherein said determining said current path traveled by said mobile terminal comprises determining the position of said mobile terminal from a signal transmitted by said mobile terminal.

11. The method of claim 10 wherein said mobile terminal includes a position estimating device and wherein said position estimating device helps perform said determining the position of said mobile terminal.

12. A method for tracking handoffs in a mobile communication network comprising:

identifying a route associated with a path traveled by a mobile terminal;

monitoring the position of a mobile terminal traveling along said route;

when a hand-off event occurs, determining the hand-off position of said mobile terminal along said route at the time of said hand-off event;

storing said hand-off position corresponding to said hand-off event in said mobile communication network; and

measuring service quality at a predetermined time period before and after said hand-off event and storing said service qualities in said mobile communication network.

13. The method of claim 12 wherein said service quality includes estimate at least one of the following:

bit error rate and word error rate.

14. The method of claim 12 further including measuring both an uplink and a downlink service quality.

15. The method of claim 12 further including storing the difference between said before and after service qualities.

16. A method for tracking handoffs in a mobile communication network comprising:

identifying a route associated with a path traveled by a mobile terminal;

monitoring the position of a mobile terminal traveling along said route;

when a hand-off event occurs, determining the hand-off position of said mobile terminal along said route at the time of said hand-off event;

storing said hand-off position corresponding to said hand-off event in said mobile communication network; and

storing an indication of the direction said mobile terminal was traveling along said route at the time of said hand-off.

17. A method for tracking handoffs in a mobile communication network comprising:

identifying a route associated with a path traveled by a mobile terminal;

monitoring the position of a mobile terminal traveling along said route;

when a hand-off event occurs, determining the hand-off position of said mobile terminal along said route at the time of said hand-off event;

storing said hand-off position corresponding to said hand-off event in said mobile communication network; and

storing an indication of the speed of said mobile terminal at the time of said hand-off.

18. A method for tracking handoffs in a mobile communication network comprising:

identifying a route associated with a path traveled by a mobile terminal;

monitoring the position of a mobile terminal traveling along said route;

when a hand-off event occurs, determining the hand-off position of said mobile terminal along said route at the time of said hand-off event; and

storing said hand-off position corresponding to said hand-off event in said mobile communication network; and

maintaining an overall service metric associated with each of said handoff positions.

19. A method of determining a handoff for a mobile terminal actively engaged in a call and moving within a mobile communication network, said method comprising:

servicing said mobile terminal through a first base station as said mobile terminal moves through a first geographic area served by said first base station;

matching the movement of said mobile terminal with a predetermined route that is stored in said mobile communication network; and

thereafter, maintaining service to said mobile terminal through said first base station when said mobile terminal moves within a second geographic area served by a second base station based upon said route indicating that said mobile terminal will return to said first geographic area.

20. The method of claim 19 further including said first base station handing off said mobile terminal to said second base station if said mobile terminal moves into said second geographic area and a quality level drops below a predetermined level.

21. The method of claim 19 further including timing said mobile terminal as it moves within said second geographic area and further including said first base station handing off said mobile terminal to said second base station if said mobile terminal remains within said second geographic area for a predetermined time.

22. The method of claim 19 further including monitoring the movement of said mobile terminal within said second geographic area and further including determining whether said mobile terminal has deviated from said route while moving within said second geographic area.

23. The method of claim 19 further including tracking the movement of said mobile terminal as it moves within said first geographic area served by said first base station.