AUTOMATIC CONFIGURATION OF INTER-DOMAIN ACCESS TECHNOLOGY NEIGHBOR RELATIONS

• US 20100003980A1
• Filed: 03/13/2009
• Published: 01/07/2010
• Est. Priority Date: 07/02/2008
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: RUNE, Johan, Sachs, Joachim
• Granted Patent: US 8,391,238 B2
• Time in Patent Office: Days
• US Class Current: 455/436
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information

Abstract

The disclosure relates to automatically configuring a map of inter-access technology neighbor relations. In this neighbor relations map configured by an ANDSF, relationships between neighboring cells of differing access networks of the same or different access technologies are maintained including extra-domain and non-domain neighbor relationships. A domain refers to a domain of one or more access technologies in which ANDSF is not required for intra-domain access selection and discovery. ANDSF configures the map based on neighbor relations data reports from wireless terminals, which record the neighbor relations data as they perform extra-domain or non-domain handovers or reselections or as they scan their surroundings. ANDSF provides steering instructions to configure the neighbor relations data recording and reporting behaviors of the wireless terminals. ANDSF provides access network discovery and selection information, which indicates availability of non-domain accesses, and in some cases domain accesses, to wireless terminals based on their locations.

Claims

1. A method of operating an Access Network Discovery and Selection Function (ANDSF) apparatus within a domain of access technologies, the method comprising:

automatically configuring a neighbor relations map based on neighbor relations data from one or more reporting terminals, wherein

the neighbor relations data includes data on

one or more non-domain cells each of which is a neighbor of another non-domain cell, and/or

one or more non-domain cells each of which is a neighbor of a domain cell, and/or

one or more domain cells each of which is a neighbor of a non-domain cell, and

information maintained in the neighbor relations map include

extra-domain neighbor relations each of which is a neighbor relation between a domain cell and its extra-domain neighbor and vice versa, and/or

non-domain neighbor relations each of which is a neighbor relation between two non-domain neighbors.

2. The method of claim 1, wherein the domain comprises a set of 3GPP access technologies.

3. The method of claim 1, wherein the step of automatically configuring the neighbor relations map comprises:

providing steering instructions to the reporting terminals;

receiving the neighbor relations data from the reporting terminals; and

updating the neighbor relations map based on the neighbor relations data from the reporting terminals, wherein

the steering instructions specify neighbor relations data recording and reporting behaviors of the reporting terminals.

4. The method of claim 3, wherein the step of providing the steering instructions to the reporting terminals comprises:

determining update needs of the neighbor relations map;

selecting the reporting terminals among available wireless terminals to gather the neighbor relations data for the update needs;

forming the steering instructions for the reporting terminals based on the update needs; and

sending the steering instructions to the reporting terminals.

5. The method of claim 4, wherein the step of determining the update needs of the neighbor relations map comprises any one or more of:

determining whether or not neighbor relations information for a region is older than a predetermined age,

determining whether or not there is insufficient neighbor relations data for an access network using an access technology outside the domain, and

determining whether or not there is insufficient extra-domain neighbor relations data for an access network within the domain.

6. The method of claim 4, wherein the step of selecting the reporting terminals comprises any one or more of:

selecting the reporting terminals based on their access technology capabilities,

selecting the reporting terminals based on their positioning capabilities,

selecting the reporting terminals based on their power supply,

selecting the reporting terminals based on their subscription,

selecting a subset of available wireless terminals, the subset being less than all, and

assigning the available wireless terminals with reporting probability values which control each terminal'"'"'s probability of participating in the neighbor relations data recording and reporting.

7. The method of claim 6, wherein when the subset of available wireless terminals are selected, the subset is changed periodically such that substantially all wireless terminals participate in the neighbor relations data recording and reporting over a specified duration.

8. The method of claim 6, wherein when the reporting terminals are given reporting probability values, the reporting probability value of each reporting terminal is based on traits of the reporting terminal including any on or more of access technology capabilities, positioning capabilities, subscription, and power supply.

9. The method of claim 4, wherein the step of forming the steering instructions comprises any one or more of:

forming the steering instructions to prioritize the neighbor relations recording and reporting based on the update needs of the map,

forming the steering instructions to record and report neighbor relations in a specific region,

forming the steering instructions to record and report neighbor relations for an access network which uses an access technology outside the domain and for which there is insufficient neighbor relations information,

forming the steering instructions to record and report extra-domain neighbor relations for an access network which uses an access technology within the domain and for which there is insufficient extra-domain neighbor relations information,

forming the steering instructions to blacklist an access network or access technology,

forming the steering instructions to record and report neighbor relations when roaming within a particular PLMN,

forming the steering instructions to specify a minimum reporting interval which instructs the reporting terminals to wait at least for the minimum reporting interval to pass in between reportings,

forming the steering instructions to specify a minimum number of detected neighbor relations which instructs the reporting terminals include at least the minimum number of neighbor relations when reporting,

forming the steering instructions to instruct the reporting terminals to report only during one or more specified reporting time periods, and

forming the steering instructions to suspend reporting of most frequently detected neighbor relations within a predetermined recent time period.

10. The method of claim 9, wherein the step of forming the steering instructions further comprises any one or more of:

forming the steering instructions to instruct that the minimum reporting interval does not apply to opportunistic reporting or during the specified reporting time periods,

forming the steering instructions to instruct that the minimum number of detected neighbor relations does not apply to opportunistic reporting or during the specified reporting time periods, and

forming the steering instructions to specify a maximum time suppression period to instruct the reporting terminals to report any detected neighbor relations even when the number of detected neighbor relations is less than the minimum number of detected neighbor relations when the maximum time suppression period since a previous report has elapsed.

11. The method of claim 1, wherein the data on each cell in the neighbor relations data includes at least an access technology and a global cell identity, the data on each cell further including zero or more of the following:

a physical cell identity, carrier frequency, carrier bandwidth, registration area identity, network identity, operator identity, cell specific configuration, success/failure of handover or movement in idle mode, and location.

12. The method of claim 1, further comprising providing access network discovery and selection information to one or more receiving terminals based on the neighbor relations map, wherein

for each receiving terminal, the access network discovery and selection information is adapted to the receiving terminal'"'"'s location,

the access network discovery and selection information includes a list of non-domain cells and/or domain cells within a vicinity of the receiving terminal.

13. The method of claim 12, wherein

the access network discovery and selection information includes a list of non-domain cells when the receiving terminal is currently located in a domain access network, and

the access network discovery and selection information includes a list of non-domain cells and/or domain cells when the receiving terminal is currently located in a non-domain access network.

14. The method of claim 12, wherein the step of providing the access network discovery and selection information to the receiving terminals comprises performing for each receiving terminal:

determining or receiving a location information related to the receiving terminal;

forming the access network discovery and selection information from the neighbor relations map based on the location information; and

providing the access network discovery and selection information to the receiving terminal.

15. The method of claim 14, wherein the step of providing the access network discovery and selection information to the receiving terminals further comprises filtering the access network discovery and selection information prior to providing the access network discovery and selection information to each receiving terminal, wherein filtering criteria includes any one or more of:

exclude cells with access technologies not supported by the receiving terminal,

exclude cells which the receiving terminal is not authorized to access,

exclude cells with a “

usefulness indicator”

below a predetermined threshold level, the usefulness indicator indicating a probability of success of access, handover or movement in idle mode,

exclude cells whose relations information is older than a predetermined age threshold, and

exclude cells whose distance from a position indicated in the location information is greater than a predetermined threshold distance.

16. The method of claim 14, wherein step of forming the access network discovery and selection information comprises forming new access network discovery and selection information when the receiving terminal has reached a border of an area covered by previously provided access network discovery and selection information or is outside the area.

17. The method of claim 14, wherein the step of providing the access network discovery and selection information to the receiving terminal comprises providing the access network discovery and selection information according to any one or more of:

upon request from the receiving terminal,

when the receiving terminal'"'"'s location indicates that transfer of the access network discovery and selection information is appropriate, and

periodically.

18. The method of claim 1, wherein at least one reporting terminal or at least one receiving terminal is a visiting wireless terminal.

19. An Access Network Discovery and Selection Function (ANDSF) apparatus within a domain of access technologies, the apparatus comprising:

a communication unit arranged to provide steering instructions to one or more reporting terminals and receive neighbor relations data from the reporting terminals; and

a processing unit arranged to form the steering instructions and automatically configure a neighbor relations map based on the neighbor relations data from the reporting terminals, wherein

the steering instructions specify neighbor relations data recording and reporting behaviors of the reporting terminals,

the neighbor relations data includes data on

one or more non-domain cells each of which is a neighbor of another non-domain cell, and/or

one or more non-domain cells each of which is a neighbor of a domain cell, and/or

one or more domain cells each of which is a neighbor of a non-domain cell, and

information maintained in the neighbor relations map include

extra-domain neighbor relations each of which is a neighbor relation between a domain cell and its extra-domain neighbor and vice versa, and/or

non-domain neighbor relations each of which is a neighbor relation between two non-domain neighbors.

20. The ANDSF apparatus of claim 19, wherein the domain comprises a set of 3GPP access technologies.

21. The ANDSF apparatus of claim 19, wherein the processing unit forms the steering instructions by determining update needs of the neighbor relations map, selecting the reporting terminals among available wireless terminals to participate in gathering the neighbor relations data for the update needs, and forming the steering instructions for the reporting terminals based on the update needs.

22. The ANDSF apparatus of claim 21, wherein the processing unit

selects the reporting terminals from the available wireless terminals or assigns reporting probability values, which control each wireless terminal'"'"'s probability of participating, to the available wireless terminals based on any one or more of terminal'"'"'s access technology capabilities, positioning capabilities, power supply, and subscription, or

selects a subset less than all available wireless terminals.

23. The ANDSF apparatus of claim 21, wherein the processing unit forms the steering instructions to instruct the reporting terminals to perform any one or more of:

prioritize the neighbor relations recording and reporting based on the update needs of the map,

record and report neighbor relations in a specific region,

record and report neighbor relations for an access network which uses an access technology outside the domain and for which there is insufficient neighbor relations information,

record and report neighbor relations for an access network which uses an access technology within the domain and for which there is insufficient extra-domain neighbor relations information,

blacklist an access network or access technology,

record and report neighbor relations when roaming within a particular PLMN,

wait at least for a minimum reporting interval to pass in between reportings,

include at least a minimum number of neighbor relations when reporting,

report any detected neighbor relations after a maximum report suppression period even when a number of detected neighbor relations is less than the minimum number of detected neighbor relations,

report only during one or more specified reporting time periods, suspend reporting of most frequently detected neighbor relations within a predetermined recent time period, and

use opportunistic reporting at any time.

24. The ANDSF apparatus of claim 19, wherein the data on each cell in the neighbor relations data includes at least an access technology and a global cell identity, the data on each cell further including zero or more of the following:

a physical cell identity, carrier frequency, carrier bandwidth, registration area identity, network identity, operator identity, cell specific configuration, usefulness indicator, success/failure probability of handover or movement in idle mode, and location.

25. The ANDSF apparatus of claim 19, wherein

the processing unit forms access network discovery and selection information for one or more receiving terminals based on the neighbor relations map such that for each receiving terminal, the access network discovery and selection information is adapted to each receiving terminal'"'"'s location and includes a list of non-domain cells and/or domain cells within a vicinity of each receiving terminal, and

the communication unit provides the access network discovery and selection information to each receiving terminal upon request from the receiving terminal, when the receiving terminal'"'"'s location indicates that transfer of the access network discovery and selection information is appropriate, and/or periodically.

26. The ANDSF apparatus of claim 25, wherein

the access network discovery and selection information includes a list of non-domain cells when the receiving terminal is currently located in a domain access network, and

the access network discovery and selection information includes a list of non-domain cells and/or domain cells when the receiving terminal is currently located in a non-domain access network.

27. The ANDSF apparatus of claim 25, wherein the processing unit filters the access network discovery and selection information before the communication unit provides the access network discovery and selection information to the receiving terminals in which filtering criteria includes any one or more of:

exclude cells with access technologies not supported by the receiving terminal,

exclude cells which the receiving terminal is not authorized to access,

exclude cells with a “

usefulness indicator”

below a predetermined threshold level, the usefulness indicator indicating a probability of success of access, handover or movement in idle mode,

exclude cells whose relations information is older than a predetermined age threshold, and

exclude cells whose distance from a position indicated in the location information is greater than a predetermined threshold distance.

28. The ANDSF apparatus of claim 25, wherein the processing unit forms new access network discovery and selection information when the receiving terminal has reached a border of an area covered by previously provided access network discovery and selection information or is outside the area.

29. The apparatus of claim 19, wherein at least one reporting terminal or at least one receiving terminal is a visiting wireless terminal.

31. The method of claim 29, wherein the step of reporting the neighbor relations data to the ANDSF apparatus comprises:

receiving the steering instructions from the ANDSF apparatus;

collecting the neighbor relations data by one or both of;

performing any one of an extra-domain handover, an extra-domain cell reselection, a non-domain handover, and a non-domain cell reselection; and

scanning a surrounding of the wireless terminal;

recording the collected neighbor relations data consistent with the steering instructions; and

reporting the recorded neighbor relations data to the ANDSF apparatus consistent with the steering instructions, wherein

the data on each cell in the neighbor relations data includes at least an access technology and a global cell identity, the data on each cell further including zero or more of the following;

a physical cell identity, carrier frequency, carrier bandwidth, registration area identity, network identity, operator identity, cell specific configuration, success/failure of handover or movement in idle mode, and location.

32. The method of claim 31, wherein the step of reporting the recorded neighbor relations data comprises any one or more of:

specifically contacting ANDSF for the purpose of reporting the neighbor relations data;

opportunistically reporting the neighbor relations data; and

responding to a poll from the ANDSF.

33. The method of claim 31, wherein the steering instructions provide instructions to the wireless terminal to perform any one or more of:

prioritize the neighbor relations data recording and reporting based on any one more of a region, access technology, and access network,

record and report neighbor relations in a specific region,

record and report neighbor relations for a particular access network or access technology,

blacklist an access network or access technology,

record and report neighbor relations when roaming within a particular PLMN,

wait at least for a minimum reporting interval to pass in between reportings,

include at least a minimum number of neighbor relations when reporting,

report any detected neighbor relations after a maximum report suppression period even when a number of detected neighbor relations is less than the minimum number of detected neighbor relations.

report only during one or more specified reporting time periods,

suspend reporting of most frequently detected neighbor relations within a predetermined recent time period, and

use opportunistic reporting at any time.

30. A method of operating a wireless terminal, the method comprising:

reporting neighbor relations data to an Access Network Discovery and Selection Function (ANDSF) apparatus operating within a domain of access technologies based on steering instructions from the ANDSF apparatus, wherein

the steering instructions specifies neighbor relations data recording and reporting behavior of the wireless terminal, and

the neighbor relations data includes data on

one or more non-domain cells each of which is a neighbor of another non-domain cell, and/or

one or more non-domain cells each of which is a neighbor of a domain cell, and/or

one or more domain cells each of which is a neighbor of a non-domain cell.

34. The method of claim 30, wherein when the steering instructions are not in effect, the wireless terminal collects, records, and reports the neighbor relations data according to preconfigured default principles.

35. The method of claim 30, further comprising:

providing location information related to a current location of the wireless terminal;

receiving access network discovery and selection information from the ANDSF apparatus; and

scanning for non-domain cells and/or domain cells based on the received access network discovery and selection information.

36. The method of claim 35, further comprising filtering the access network discovery and selection information prior to scanning, wherein filtering criteria includes any one or more of:

exclude from scanning cells in the access network discovery and selection information whose access technology is not supported by the wireless terminal,

exclude from scanning cells in the access network discovery and selection information which the wireless terminal is not authorized to access,

exclude from scanning cells in the access network discovery and selection information with a “

usefulness indicator”

below a predetermined threshold level, the usefulness indicator indicating a probability of success of access, handover or movement in idle mode,

exclude from scanning cells in the access network discovery and selection information whose relations information is older than a predetermined age threshold, and

exclude from scanning cells in the access network discovery and selection information located greater than a predetermined threshold distance from the wireless terminal.

37. The method of claim 35, wherein the step of scanning for non-domain cells comprises scanning for non-domain cells and/or domain cells which are not in the access network discovery and selection information

when it is determined that the access network discovery and selection information is insufficient, or

when it is determined that the access network discovery and selection information indicates that there are no useful or reachable neighboring cells and the wireless terminal must perform a handover.

38. A wireless terminal, comprising:

a communication unit arranged to

receive steering instructions from an Access Network Discovery and Selection Function (ANDSF) apparatus operating within a domain of access technologies, the steering instructions specifying neighbor relations data recording and reporting behavior of the wireless terminal,

collect the neighbor relations data through performing an inter-access transition or scanning a surrounding of the wireless terminal, where inter-access transition is a handover or movement in idle mode between a cell in the domain and a cell not in the domain or a handover or movement in idle mode between two cells not in the domain, and

report the neighbor relations data to the ANDSF apparatus consistent with the steering instructions, and

a processing unit arranged to record the collected neighbor relations data into a storage unit consistent with the steering instructions prior to being reported by the communication unit, wherein

the neighbor relations data includes data on

one or more non-domain cells each of which is a neighbor of another non-domain cell, and/or

one or more non-domain cells each of which is a neighbor of a domain cell, and/or

one or more domain cells each of which is a neighbor of a non-domain cell, and

the data on each cell in the neighbor relations data includes at least an access technology and a global cell identity, the data on each cell further including zero or more of the following;

a physical cell identity, carrier frequency, carrier bandwidth, registration area identity, network identity, operator identity, cell specific configuration, success/failure of handover or movement in idle mode, and location.

39. The wireless terminal of claim 38, wherein the communication unit receives access network discovery and selection information from the ANDSF apparatus and scans for non-domain cells and/or domain cells based on the received access network discovery and selection information.

40. The wireless terminal of claim 39, wherein the communication unit scans for non-domain cells and/or domain cells that are not in the access network discovery and selection information

when the processing unit determines that the access network discovery and selection information is insufficient, or

when the processing unit determines that the access network discovery and selection information indicates that there are no useful or reachable neighboring cells and the wireless terminal must perform a handover.