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US 8,526,945 B2Granted
Tracking and paging at boundries in LTE networks
AssigneeAlcatel Lucent
InventorsJames P. Knauft, Omar H. Salvador, Ranga P. Tota
Life of this patent
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Abstract
A method, in one example, comprising the steps of receiving a tracking area identifier indicating a tracking area where a user equipment (UE) is located, and updating a current tracking area of the UE based on whether the tracking area identifier indicates that the UE is currently in a previously visited tracking area.
Claims17
A method, executed on at least one of a mobility management entity or an LTE network computer node comprising:
- receiving a first tracking area identifier indicating a tracking area where a user equipment (UE) is located;
- updating a registered tracking area (RTA) list for the UE based on whether the first tracking area identifier corresponds with a previously visited tracking area for the UE, wherein the RTA list comprises at least one second tracking area identifier indicating a tracking area where the UE was previously registered;
- wherein the step of updating the RTA list comprises:
- comparing the first tracking area identifier to a last seen tracking area (LSTA) list for the UE to determine whether the UE is engaged in cyclic movement;
- removing the at least one second tracking area identifier from the RTA list if the UE is not engaged in cyclic movement;
- adding the first tracking area identifier to the RTA list;
- the method further comprising the step of:
- updating the LSTA list with the first tracking area identifier.
5 more elements
An apparatus, comprising
- a mobility management entity (MME) that comprises a processor and an associated memory, the MME configured to maintain a registered tracking area (RTA) list for a user equipment (UE),
- wherein the MME is configured to update the RTA list based on tracking area updates received from the UE that indicate whether the UE is engaged in cyclic movement;
- wherein the MME is configured to remove tracking area identifiers, for tracking areas previously visited by the UE, from the RTA list if the UE is not engaged in cyclic movement;
- and
- wherein the MME is configured to page the UE based on tracking areas identified in the RTA list.
2 more elements
Dependencies are inferred from the claim text.