Forbidden tracking area optimization for private/home networks

• US 8,116,736 B2
• Filed: 02/08/2008
• Issued: 02/14/2012
• Est. Priority Date: 02/09/2007
• Status: Active Grant

• Current Assignee: Nokia Technologies Oy (Nokia Corporation)
• Original Assignee: Nokia Corporation
• Inventors: Dalsgaard, Lars, Koskela, Jarkko T., Ore, Ivan, Sipila, Kari
• Primary Examiner(s): Gelin, Jean
• Assistant Examiner(s): Nguyen, Michael
• Application Number:
  US12/069,240
• Publication Number:
  US 20080194235A1
• Time in Patent Office: 1,467 Days
• Field of Search: 455/410, 455/411, 455/435.2, 455/432.1, 455436-444, 455/464, 455/525
• US Class Current: 455/411
• CPC Class Codes: H04J 11/0086 Search parameters, e.g. search strategy, accumulation length, range of search, thresholds code acquisition in DSSS H04B1/7075
• CPC Class Codes: H04W 48/04 based on user or terminal location or mobility data, e.g. moving direction, speed
• CPC Class Codes: H04W 48/12 using downlink control channel
• CPC Class Codes: H04W 8/26 Network addressing or numbering for mobility support
• CPC Class Codes: H04W 84/045 using private Base Stations, e.g. femto Base Stations, home Node B

Abstract

Access verification is adaptively done using an identifier of a first or a second length, by comparing a field of a node address that has the determined first or second length against a locally stored access list. At least the compared field of the node address is either added to a locally stored list of cell selection candidate nodes where the access list is allowed identifiers, or excluded from it where the access list is restricted identifiers. The node identifier is in three sections. The first section is service type, which the UE can use to determine whether or not it is restricted/allowed. The first length is the length of the second section, which is a service area ID of a group of network nodes. The second length is the length of the second section plus the third section, which identifies one node of the group of network nodes.

Claims

1. A method comprising:

determining by an apparatus whether access verification is to be done using an identifier of a first length or is to be done using an identifier of a second length;

examining a node address by the apparatus;

performing by the apparatus access verification by comparing a field of the received node address against a locally stored access list, wherein the field compared against the locally stored access list is of either the first or the second length, depending on whether a determination was made to do access verification using an identifier of the first length or a determination was made to do access verification using an identifier of the second length; and

adding by the apparatus at least the compared field of the node address to a locally stored list of cell selection candidate nodes for the case where the access list comprises a list of allowed identifiers, or excluding the compared field of the node address from the locally stored list of cell selection candidate nodes for the case where the access list comprises a list of restricted identifiers.

2. The method of claim 1, further comprising signaling to support a handover to a node having an address whose field matches an entry on the locally stored list of cell selection candidate nodes.

3. The method of claim 1, wherein determining whether access verification is to be done using an identifier of the first length or is to be done using an identifier of the second length is determined implicitly from the length of the received node address.

4. The method of claim 1, wherein determining whether access verification is to be done using an identifier of the first length or is to be done using an identifier of the second length is accomplished based at least in part on explicit signaling received from a network separate from the node address and received over a broadcast channel.

5. The method of claim 4, wherein the explicit signaling comprises a range indication that indicates how many bits are to be compared.

6. The method of claim 1, wherein the node address comprises a second section that is of the first length, and a third section, wherein the combination of the second section with the third section is of the second length.

7. The method of claim 6, wherein the second section comprises a service area identifier that identifies a geographic grouping of nodes and the third section comprises a node identifier that uniquely identifies one node of the grouping of nodes.

8. The method of claim 7, wherein the node address further comprises a first section that indicates a type of service, and the method further comprises using the first section to additionally distinguish whether the node address is allowed or restricted prior to performing the access verification.

9. The method of claim 1, further comprising, for the case where the access list comprises a list of restricted identifiers:

locally storing service area identifiers that are restricted on a forbidden list;

when the service area is no longer forbidden, removing all of the service area identifiers from the forbidden list;

when a memory allocated for storing the forbidden list becomes full, removing the oldest stored service area identifier from the forbidden list whenever a new stored service identifier is added to the forbidden list.

10. The method of claim 1, wherein the apparatus comprises a mobile terminal moving between a node operating with one radio access technology and another node operating with a different radio access technology.

11. An apparatus comprising:

a receiver configured to receive a node address;

a processor configured to determine whether access verification is to be done using an identifier of a first length or is to be done using an identifier of a second length, and further configured to perform access verification by comparing a field of the received node address against a locally stored access list, wherein the field compared against the locally stored access list is of either the first or the second length, depending on whether a determination was made to do access verification using an identifier of the first length or a determination was made to do access verification using an identifier of the second length; and

a local memory to which the processor adds at least the compared field of the node address to a list of cell selection candidate nodes for the case where the access list comprises a list of allowed identifiers, or from which the processor excludes the compared field of the node address from the list of cell selection candidate nodes for the case where the access list comprises a list of restricted identifiers.

12. The apparatus of claim 11, wherein the apparatus further comprises a receiver configured to receive the node address, and wherein the processor and receiver are further configured to signal to support a handover of the apparatus to a node having an address whose field matches an entry on the locally stored list of candidate cells.

13. The apparatus of claim 11, wherein the processor determines whether access verification is to be done using an identifier of the first length or is to be done using an identifier of the second length based at least in part on the length of the node address that is received at the receiver.

14. The apparatus of claim 11, wherein the processor determines whether access verification is to be done using an identifier of the first length or is to be done using an identifier of the second length from explicit signaling received from a network at the receiver separate from the received node address and received on a broadcast channel.

15. The apparatus of claim 14, wherein the explicit signaling comprises a range indication that signifies how many bits are to be compared.

16. The apparatus of claim 11, wherein the node address comprises a second section that is the of first length, and a third section, wherein the combination of the second section with the third section is of the second length.

17. The apparatus of claim 16, wherein the second section comprises a service area identifier that identifies a grouping of nodes and the third section comprises a node identifier that uniquely identifies one node of the grouping of nodes.

18. The apparatus of claim 17, wherein the node address further comprises a first section that indicates a type of service, and the method further comprises using the first section to additionally distinguish whether the node address is allowed or restricted prior to performing the access verification.

19. The apparatus of claim 11, wherein, for the case where the access list comprises a list of restricted identifiers

the service area identifiers that are restricted are stored on a forbidden list of the memory:

when the service area is no longer forbidden, the service area identifiers are removed from the forbidden list of the memory;

when an allocation of the memory for storing the forbidden list full, the oldest stored service area identifier is removed from the forbidden list whenever a new stored service area identifier is added to the forbidden list.

20. The apparatus of claim 11, wherein the apparatus comprises a mobile terminal moving between a node operating with one radio access technology and another node operating with a different radio access technology.

21. A non-transitory computer readable memory embodying a program of machine-readable instructions, execution of which by a digital data processor causes the performance of actions comprising:

determining whether access verification is to be done using an identifier of a first length or is to be done using an identifier of a second length;

receiving a node address;

performing the access verification by comparing a field of the received node address against a locally stored access list, wherein the field compared against the locally stored access list is of either the first or the second length, depending on whether a determination was made to do access verification using an identifier of the first length or a determination was made to do access verification using an identifier of the second length; and

adding at least the compared field of the node address to a locally stored list of cell selection candidate nodes for the case where the access list comprises a list of allowed identifiers, or excluding the compared field of the node address from the locally stored list of cell selection candidate nodes for the case where the access list comprises a list of restricted identifiers.

22. An apparatus comprising:

receiving means for receiving a node address;

processing means for determining whether access verification is to be done using an identifier of a first length or is to be done using an identifier of a second length, and for performing access verification by comparing a field of the received node address against a locally stored access list, wherein the field compared against the locally stored access list is of either the first or the second length, depending on whether a determination was made to do access verification using an identifier of the first length or a determination was made to do access verification using an identifier of the second length; and

memory means for adding at least the compared field of the node address to a list of cell selection candidate nodes for the case where the access list comprises a list of allowed identifiers, or for excluding the compared field of the node address from the list of cell selection candidate nodes for the case where the access list comprises a list of restricted identifiers.