Method and apparatus for detecting and predicting motion of mobile terminals

• US 5,572,221 A
• Filed: 10/26/1994
• Issued: 11/05/1996
• Est. Priority Date: 10/26/1994
• Status: Expired due to Term

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Marlevi, Alexander, Liu, George, Danne, Anders
• Primary Examiner(s): Tarcza, Thomas H.
• Assistant Examiner(s): PHAN, DAO LINDA
• Application Number:
  US08/329,608
• Time in Patent Office: 741 Days
• Field of Search: 364/449, 342/457, 342/357, 455/12.1, 455/33.2, 455/56.1, 379/59, 379/60
• US Class Current: 342/452
• CPC Class Codes: H04W 28/18 Negotiating wireless communication parameters
• CPC Class Codes: H04W 64/006 with additional information processing, e.g. for direction or speed determination

Abstract

Methods and apparatus for detecting and predicting movement patterns of mobile radio transceivers, such as mobile cellular telephones, enhance the performance of hierarchical radio networks, in which network structures, such as different cells, have different communication bandwidths. One method of predicting a next location of a mobile terminal based on stored previous locations of the mobile terminal includes the step of comparing a current sequence that includes the current location of the mobile terminal and a plurality of previous locations of the mobile terminal to each of a plurality of stored sequences that each include previous locations of the mobile terminal. The method also includes the steps of selecting one of the stored sequences based on at least one quantitative measure of a degree of matching between the current sequence and each stored sequence, and predicting the next location of the mobile terminal based on the selected one of the stored sequences. Methods and apparatus for determining regular patterns in movements of a mobile terminal are also described, as is a communication network having a plurality of servers, the servers being positioned in respective geographical areas and organized in a distributed file system; a mobile terminal having a device for communicating with the server nearest the mobile terminal, the communicating device accessing application files and data files stored in the servers; and a mobile distributed system platform having a device for controlling the distributed file system of the servers and a device for predicting a next location of a mobile terminal, the controlling device distributing location sensitive information among the servers based on a next location predicted by the predicting device.

Claims

1. A method of predicting a next location of a mobile terminal based on stored previous locations of the mobile terminal comprising the steps of:

comparing a current sequence that includes the current location of the mobile terminal and a plurality of previous locations of the mobile terminal to each of a plurality of stored sequences that each include previous locations of the mobile terminal;

selecting one of the stored sequences based on at least one quantitative measure of a degree of matching between the current sequence and each stored sequence; and

predicting the next location of the mobile terminal based on the selected one of the stored sequences.

2. The method of claim 1, wherein the plurality of stored sequences include movement circles and movement tracks.

3. The method of claim 1, wherein one of the stored sequences is selected based on a ratio of a number of locations in the current sequence that are the same as locations in a stored sequence and a total number of locations in the current sequence.

4. The method of claim 3, wherein one of the stored sequences is selected further based on a quantitative measure of a degree that a duration of the current sequence matches a duration of each stored sequence.

5. The method of claim 4, wherein one of the stored sequences is selected further based on a quantitative measure of a degree that a frequency of the current sequence matches a frequency of each stored sequence.

6. An apparatus for predicting a next location of a mobile terminal based on previous locations of the mobile terminal comprising:

a memory for storing sequences of previous locations of the mobile terminal;

means, in communication with the memory, for comparing a current sequence that includes the current location of the mobile terminal and a plurality of previous locations of the mobile terminal to each of a plurality of stored sequences;

means for selecting one of the stored sequences based on at least one quantitative measure of a degree of matching between the current sequence and each stored sequence; and

means for generating a prediction of the next location of the mobile terminal based on the selected one of the stored sequences.

7. The apparatus of claim 6, wherein the plurality of stored sequences include movement circles and movement tracks.

8. The apparatus of claim 6, wherein the selecting means includes means for determining a ratio of a number of locations in the current sequence that are the same as locations in a stored sequence and a total number of locations in the current sequence, and the one of the stored sequences is selected based on the ratio.

9. The apparatus of claim 8, wherein the selecting means further includes means for generating a second quantitative measure of a degree that a duration of the current sequence matches a duration of each stored sequence, and the one of the stored sequences is selected based on the ratio and the second quantitative measure.

10. The apparatus of claim 9, wherein the selecting means further includes means for generating a third quantitative measure of a degree that a frequency of the current sequence matches a frequency of each stored sequence, and the one of the stored sequences is selected based on the ratio, the second quantitative measure, and the third quantitative measure.

11. A method of predicting movements of a mobile terminal comprising the steps of:

(a) comparing a current sequence that includes the current location of the mobile terminal and a plurality of previous locations of the mobile terminal to each of a plurality of stored sequences that each include previous locations of the mobile terminal;

(b) determining at least one quantitative measure of a degree of matching between the current sequence and each stored sequence; and

(c) if the at least one quantitative measure exceeds a predetermined value, using the locations of the respective stored sequence as predictions of the movements of the mobile terminal.

12. The method of claim 11, wherein the quantitative measure is a ratio of a number of locations in the current sequence that are the same as locations in a stored sequence and a total number of locations in the current sequence.

13. The method of claim 12, wherein step (b) further determines a first degree that a duration of the current sequence matches a duration of each stored sequence, and step (c) uses as predictions of the movements of the mobile terminal the locations of the stored sequence for which the ratio exceeds a first predetermined value and the first degree exceeds a second predetermined value.

14. The method of claim 13, wherein step (b) further determines a second degree that a frequency of the current sequence matches a frequency of each stored sequence, and step (c) uses as predictions of the movements of the mobile terminal the locations of the stored sequence for which the second degree exceeds a third predetermined value.

15. A method of determining regular patterns in movements of a mobile terminal comprising the steps of:

(a) comparing a current location of the mobile terminal to each of a plurality of previous locations stored in a queue of a plurality of previous locations, the previous locations being stored in the queue in first-in-first-out order of occurrence;

(b) if the current location matches one of the plurality of previous locations stored in the queue, marking a sequence of locations comprising the current location, the previous location that matches the current location, and the previous locations that occurred after the previous location that matches the current location;

(c) comparing the marked sequence to each of a plurality of stored sequences of locations and determining at least one quantitative measure of a degree of matching between the marked sequence and each stored sequence; and

(d) if the at least one quantitative measure exceeds a predetermined value, increasing a priority parameter of the respective stored sequence by a predetermined amount.

16. The method of claim 15, further comprising the steps of:

(e) storing the current location of the mobile terminal in the queue in first-in-first-out order of occurrence;

(f) determining whether the current location is at least one of a stationary state and a boundary state; and

carrying out steps (a)-(d) if the current location is at least one of a stationary state and a boundary state.

17. The method of claim 16, wherein step (c) determines a ratio of a number of locations in the marked sequence that are the same as locations in a stored sequence and a total number of locations in the marked sequence.

18. The method of claim 17, wherein step (c) further determines a degree that a duration of the marked sequence matches a duration of each stored sequence.

19. The method of claim 18, wherein step (c) further determines a degree that a frequency of the marked sequence matches a frequency of each stored sequence.

20. An apparatus for determining regular patterns in movements of a mobile terminal comprising:

a memory for storing a queue of a plurality of previous locations of the mobile terminal, the previous locations being stored in the queue in first-in-first-out order of occurrence;

first means for comparing a current location of the mobile terminal to each of the plurality of previous locations stored in the queue;

means for marking a sequence of locations comprising the current location, the previous location that matches the current location, and the previous locations that occurred after the previous location that matches the current location if the current location matches one of the plurality of previous locations stored in the queue;

second means for comparing the marked sequence to each of a plurality of stored sequences of locations and for determining at least one quantitative measure of a degree of matching between the marked sequence and each stored sequence; and

means for increasing a priority parameter of the respective stored sequence by a predetermined amount when the at least one quantitative measure exceeds a predetermined value.

21. The apparatus of claim 20, wherein the current location of the mobile terminal is stored in the queue in first-in-first-out order of occurrence, and further comprising means for determining whether the current location is at least one of a stationary state and a boundary state.

22. The apparatus of claim 21, wherein the second means determines a ratio of a number of locations in the marked sequence that are the same as locations in a stored sequence and a total number of locations in the marked sequence.

23. The apparatus of claim 22, wherein the second means further determines a degree that a duration of the marked sequence matches a duration of each stored sequence.

24. The apparatus of claim 23, wherein the second means further determines a degree that a frequency of the marked sequence matches a frequency of each stored sequence.

25. A method of determining regular patterns in movements of a mobile terminal comprising the steps of:

(a) determining whether a current location of the mobile terminal is at least one of a stationary state and a boundary state;

(b) marking a sequence of locations comprising the current location, one of the most recent previous stationary state and the most recent previous boundary state, and previous locations that occurred between the one of the most recent previous stationary state and the most recent previous boundary state;

(c) comparing the marked sequence to each of a plurality of stored sequences of locations and determining at least one quantitative measure of a degree of matching between the marked sequence and each stored sequence; and

(d) if the at least one quantitative measure exceeds a predetermined value, increasing a priority parameter of the respective stored sequence by a predetermined amount.

26. The method of claim 25, further comprising the step of storing the current location in a queue of a plurality of the previous locations, the locations being stored in the queue in first-in-first-out order of occurrence, and wherein steps (a)-(d) are carried out if the current location is at least one of a stationary state and a boundary state.

27. The method of claim 25, wherein a ratio of a number of locations in the marked sequence that are the same as locations in a stored sequence and a total number of locations in the marked sequence is determined.

28. The method of claim 27, wherein a degree that a duration of the marked sequence matches a duration of each stored sequence is determined.

29. The method of claim 28, wherein a degree that a frequency of the marked sequence matches a frequency of each stored sequence is determined.

30. An apparatus for determining regular patterns in movements of a mobile terminal comprising:

means for determining whether a current location of the mobile terminal is at least one of a stationary state and a boundary state;

means for marking a sequence of locations comprising the current location, one of the most recent previous stationary state and the most recent previous boundary state, and previous locations that occurred between the one of the most recent previous stationary state and the most recent previous boundary state;

means for comparing the marked sequence to each of a plurality of stored sequences of locations and for determining at least one quantitative measure of a degree of matching between the marked sequence and each stored sequence; and

means for increasing a priority parameter of the respective stored sequence by a predetermined amount if the at least one quantitative measure exceeds a predetermined value.

31. The apparatus of claim 30, further comprising a memory for storing the current location in a queue of a plurality of the previous locations, the locations being stored in the queue in first-in-first-out order of occurrence.

32. The apparatus of claim 31, wherein the comparing and determining means determines a ratio of a number of locations in the marked sequence that are the same as locations in a stored sequence and a total number of locations in the marked sequence.

33. The apparatus of claim 32, wherein the comparing and determining means determines a degree that a duration of the marked sequence matches a duration of each stored sequence.

34. The apparatus of claim 33, wherein the comparing and determining means determines a degree that a frequency of the marked sequence matches a frequency of each stored sequence.

35. In a cellular radiotelephone system having a plurality of base stations and a mobile terminal, each base station transmitting respective control information on a respective control channel, an apparatus for prioritizing the base stations for a connection between the mobile terminal and a base station comprising:

means for predicting next locations of the mobile terminal based on previous locations of the mobile terminal, wherein the predicting means includes;

a memory for storing sequences of previous locations of the mobile terminal;

means, in communication with the memory, for comparing a current sequence that includes the current location of the mobile terminal and a plurality of previous locations of the mobile terminal to each of a plurality of stored sequences;

means for selecting one of the stored sequences based on at least one quantitative measure of a degree of matching between the current sequence and each stored sequence; and

means for generating predictions of the next locations of the mobile terminal based on the selected one of the stored sequences; and

means for scanning the control channels of a plurality of the base stations and for maintaining a priority list of information concerning the scanned control channels;

wherein the scanning means scans the control channels based on the predictions generated by the predicting means.