Computer readable medium and method to facilitate handover
View Patent ↗A computer readable medium has machine readable instructions that can include a fingerprint detector to evaluate input data relative to mobility fingerprint data that defines at least one predetermined zone that is a proper subset of overlap in coverage areas between first and second radio technologies to determine whether to trigger a handover between the first and second radio technologies for a mobile unit based on an evaluation of the mobility fingerprint data relative to the input data.
1. A non-transitory computer-readable medium comprising computer-executable instructions that when executed cause a processor to:
store mobility fingerprint data in memory, the mobility fingerprint data representing signal characteristics associated with at least one predetermined handover zone where a handover event from a first radio technology to a second radio technology may need to occur, the second radio technology being different from the first radio technology, the at least one predetermined handover zone corresponds to a region that is a subset of an overlap in coverage areas of the first and second radio technologies;
detect that a mobile unit resides within the at least one predetermined handover zone based on comparing signal characteristics relative to the mobility fingerprint data; and
determine whether to perform the handover event in response to detecting the mobile unit resides in the at least one predetermined handover zone.
2. The computer-readable medium of claim 1 , further comprising computer-executable instructions programmed to generate a trigger signal in response to the detecting that the mobile unit resides within the at least one predetermined handover zone.
3. The computer-readable medium of claim 2 , further comprising computer-executable instructions programmed to initiate the handover event for the mobile unit from the first radio technology to the second radio technology based on the trigger signal.
4. The computer-readable medium of claim 1 , further comprising computer-executable instructions programmed to detect that the mobile unit resides within the at least one predetermined handover zone based on results of a signal scan performed by the mobile unit.
5. The computer-readable medium of claim 1 , further comprising computer-executable instructions programmed to detect that the mobile unit resides within the at least one predetermined handover zone based on instructions from a radio system to which the mobile unit is connected via at least one of the first and second radio technologies.
6. The computer-readable medium of claim 1 , further comprising computer-executable instructions programmed to store fingerprint data in memory of the mobile unit to represent the signal characteristics corresponding to at least one mobility fingerprint based on at least one wireless signal associated with the at least one predetermined handover zone where the handover event may need to occur.
7. The computer-readable medium of claim 6 , wherein the at least one mobility fingerprint comprises a set of signals originating from different signal sources.
8. The computer-readable medium of claim 7 , wherein the different signal sources further comprise more than one type of radio technology.
9. The computer-readable medium of claim 6 , wherein the fingerprint data further comprises a primary identifier and at least one secondary identifier, the computer-readable medium further comprising computer-executable instructions programmed to allocate a greater weight to the primary identifier than to the at least one secondary identifier in evaluating whether the mobile unit resides within the at least one predetermined handover zone.
10. The computer-readable medium of claim 6 , further comprising computer-executable instructions programmed to:
prequalify the detecting by disabling at least a portion of a signal scan if at least one wireless signal does not result in a match with the fingerprint data; and
enable at least a portion of the signal scan in response to detecting that the at least one wireless signal is substantially absent from representation by the fingerprint data.
11. The computer-readable medium of claim 6 , wherein the signal characteristics further comprise path loss associated with at least one wireless signal transmitted within a wireless network with which the mobile unit is connected, the computer-readable medium further comprising computer-executable instructions programmed to evaluate the path loss from a signal scan relative to the path loss represented by the fingerprint data to determine if the mobile unit resides within the at least one predetermined handover zone.
12. The computer-readable medium of claim 6 , wherein the signal characteristics further comprise measured signal strength associated with at least one wireless signal transmitted within a wireless network with which the mobile unit is connected, the computer-readable medium further comprising computer-executable instructions programmed to evaluate the measured signal strength from a signal scan relative to signal strength represented by the fingerprint data to determine whether to trigger the handover event for the mobile unit.
13. The computer-readable medium of claim 1 , further comprising computer-executable instructions programmed to load a fingerprint data set into memory of the mobile unit for a given area in response to detecting the mobile unit is located within a boundary for the given area, the fingerprint data set comprising fingerprint data that defines the at least one predetermined handover zone where the handover event may need to occur for the given area.
14. The computer-readable medium of claim 13 , further comprising computer-executable instructions programmed to:
transmit key data from the mobile unit such that a predetermined fingerprint data set is downloaded into the memory of the mobile unit for the given area, the key data being based on one or more signals near the given area to enable identification of the predetermined fingerprint data set associated with the given area.
15. The computer-readable medium of claim 1 , wherein the at least one predetermined handover zone is part of a first substantially bounded area of an enterprise, the enterprise comprising a plurality of substantially bounded areas, each of the plurality of substantially bounded areas including at least one respective predetermined handover zone where a respective handover event may need to occur for the respective bounded area, the computer-readable medium further comprising computer-executable instructions programmed to employ different algorithms for at least two of the plurality of substantially bounded areas for evaluating whether the mobile unit resides within the at least one predetermined handover zone of the respective bounded area.
16. The computer-readable medium of claim 1 , further comprising computer-executable instructions programmed to calculate at least one feasible solution by evaluating data corresponding to scanned signal characteristics relative to mobility fingerprint data that defines the at least one predetermined handover zone.
17. The computer-readable medium of claim 16 , further comprising computer-executable instructions programmed to evaluate the at least one feasible solution relative to a corresponding infeasible solution to confirm the validity of the at least one feasible solution.
18. The computer-readable medium of claim 17 , further comprising computer-executable instructions programmed to:
collect the mobility fingerprint data at a plurality of locations proximal to the at least one predetermined handover zone to define a fingerprint vector; and
determine directionality associated with the mobile unit based on the fingerprint vector, the determined directionality defining at least a portion of the corresponding infeasible solution.
19. A non-transitory computer readable medium having machine readable instructions comprising:
a fingerprint detector programmed to evaluate input data relative to mobility fingerprint data that defines at least one predetermined zone that is a proper subset of overlap in coverage areas between first and second radio technologies and programmed to determine whether to trigger a handover between the first and second radio technologies for a mobile unit based on the evaluation of the input data relative to the mobility fingerprint data.
20. The computer readable medium of claim 19 , wherein the fingerprint detector further comprises a trigger generator programmed to generate a trigger signal in response to evaluating the input data relative to the mobility fingerprint data in a fingerprint data set, the fingerprint data set comprising the mobility fingerprint data for an area that includes a plurality of roam zones.
21. The computer readable medium of claim 20 , wherein the input data corresponds to scanned signal characteristics, wherein the machine readable instructions further comprise an evaluator that is programmed to compute at least one feasible solution by evaluating the scanned signal characteristics relative to predefined signal characteristics defined by the mobility fingerprint data.
22. The computer readable medium of claim 21 , wherein the evaluator further comprises at least one discriminator programmed to confirm the validity of the at least one feasible solution.
23. The computer readable medium of claim 19 , wherein the mobility fingerprint data comprises a selected one of a plurality of predetermined fingerprint data sets, the selected one of the predetermined fingerprint data sets being associated with a given area that includes the at least one predetermined zone and being loaded into memory of the mobile unit area based on key data corresponding to one or more signals near the given area.
24. The computer readable medium of claim 19 , wherein the input data further comprises at least one of path loss or signal strength associated with at least one wireless signal transmitted within a wireless network with which the mobile unit is connected, wherein the machine readable instructions further comprise an evaluator programmed to determine if the mobile unit resides within the at least one predetermined zone based on evaluating the path loss or signal strength relative to path loss data or signal strength data represented by the mobility fingerprint data.
25. The computer readable medium of claim 19 , wherein the input data corresponds to scanned signal characteristics resulting from at least one signal scan, the fingerprint detector further comprising a scaling component programmed to scale the scanned signal characteristics consistent with signal characteristics defined by the mobility fingerprint data.
26. A method to facilitate handover for a mobile unit, comprising:
storing fingerprint data that defines a mobility fingerprint for at least one predetermined roam zone residing within a physical space that is a subset of an overlap between coverage areas of a first radio technology and a second radio technology; and
evaluating whether to trigger a handoff for the mobile unit from the first radio technology to the second radio technology based on an evaluation of the stored fingerprint data relative to data corresponding to at least one wireless signal that is associated with the mobile unit.
27. The method of claim 26 , further comprising:
collecting mobility fingerprint data at a plurality of locations proximal to the at least one predetermined roam zone to define a fingerprint vector; and
determining directionality associated with the mobile unit based on the fingerprint vector.
28. A non-transitory computer-readable medium programmed to perform a method, comprising:
accessing stored fingerprint data that defines a mobility fingerprint for at least one predetermined roam zone residing within a physical space that is a subset of an overlap between coverage areas of a first radio technology and a second radio technology; and
evaluating whether to trigger a handoff for a mobile unit from the first radio technology to the second radio technology based on an evaluation of the stored fingerprint data relative to data corresponding to at least one wireless signal that is associated with the mobile unit.
29. The computer-readable medium of claim 28 , wherein the fingerprint data comprises a fingerprint vector determined based on mobility fingerprint data associated with a plurality of locations proximal to the at least one predetermined roam zone, and
wherein the method further comprises determining directionality associated with the mobile unit based on the fingerprint vector.
30. The computer-readable medium of claim 28 , wherein the method further comprises generating a trigger signal to initiate the handoff for the mobile unit based on the evaluation of the stored fingerprint data.
31. The computer-readable medium of claim 28 , wherein the mobility fingerprint data comprises a plurality of predetermined fingerprint data sets, one of the predetermined fingerprint data sets being selected for use in a given area based on key data corresponding to one or more signals near the given area.
32. The computer readable medium of claim 28 , wherein the data corresponding to at least one wireless signal further comprises an indication of at least one of path loss or signal strength associated with the at least one wireless signal transmitted within a wireless network with which the mobile unit is connected, wherein the machine readable instructions further comprise determine if the mobile unit resides within the at least one predetermined roam zone based on evaluating the path loss or signal strength relative to path loss data or signal strength data represented by the mobility fingerprint data.
33. The computer readable medium of claim 28 , wherein the input data corresponds to scanned signal characteristics resulting from at least one signal scan, the fingerprint detector further comprising a scaling component programmed to scale the scanned signal characteristics consistent with signal characteristics defined by the mobility fingerprint data.