Method and apparatus for performing routing area updates

• US 8,174,986 B2
• Filed: 03/03/2009
• Issued: 05/08/2012
• Est. Priority Date: 04/04/2008
• Status: Active Grant

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola Mobility, Inc. (Lenovo Group Ltd.)
• Inventors: Harris, John M.
• Primary Examiner(s): Ngo, Ricky
• Assistant Examiner(s): SAMUEL, DEWANDA A
• Application Number:
  US12/396,654
• Publication Number:
  US 20090252103A1
• Time in Patent Office: 1,162 Days
• Field of Search: 370/331, 370/236, 370/238, 370/392, 370/356, 370/355
• US Class Current: 370/236
• CPC Class Codes: H04W 8/06 Registration at serving network Location Register, VLR or user mobility server

Abstract

Various embodiments are described for potentially reducing the impact of routing area updates on wireless system capacity. Logic flow diagram 10, in FIG. 1, depicts such functionality. In some embodiments, it is determined (12) whether a remote unit is within an edge portion of a routing area, while in other embodiments it is determined (12) whether the remote unit is within an end portion of a routing area update interval. It is also determined (14) whether one or more conditions are present for the remote unit to perform a resource-efficient routing update. A routing area update is then performed (16) when one or more of the conditions are present and when, depending on the embodiment, either the remote unit is determined to be within the edge portion of the routing area or the remote unit is determined to be within the end portion of the routing area update interval.

Claims

1. A method for performing routing area updates comprising:

determining at least one of

whether a remote unit is within an edge portion of a routing area or

whether the remote unit is within an end portion of a routing area update interval;

determining whether at least one condition is present for the remote unit to perform a resource-efficient routing area update; and

when at least one of the remote unit is determined to be within the edge portion or the remote unit is determined to be within the end portion and when the at least one condition is present, performing a routing area update,

wherein determining whether the at least one condition is present for the remote unit to perform a resource-efficient routing area update comprises at least one of

receiving signaling from a network node having a signal strength greater than a threshold signal strength value,

determining that the remote unit detects a threshold number of signal strength bars,

determining that the remote unit is in a coverage area in which access classes of a lowest tier of access classes are allowed, or

determining that a loading level of a network node is below a threshold loading level.

2. The method of claim 1, wherein determining whether the remote unit is within an edge portion of the routing area comprises at least one of

receiving signaling from a network node that indicates that a coverage area of the network node is part of an edge portion of the routing area, or

determining that the remote unit has traveled more than a predetermined portion of a routing area update distance since last performing a routing area update.

3. The method of claim 2, wherein receiving signaling from the network node that indicates that a coverage area of the network node is part of an edge portion of the routing area comprises

receiving at least one of overhead messaging, a retry order, or a response to a previous routing area update.

4. The method of claim 1, wherein the threshold signal strength value is a value equivalent to one of

a predetermined threshold signal strength value or

the predetermined threshold signal strength value plus an additional signal strength amount.

5. The method of claim 1, wherein at least one of an increased threshold signal strength value or an increased threshold number of signal strength bars is used when at least one secondary condition is present, wherein the at least one secondary condition comprises at least one of

the remote unit is moving at a below-threshold velocity,

a paging interval for the remote unit has a below-threshold period,

the remote unit has only moved a below-threshold distance within the edge portion of the routing area, or

a greater signal strength is anticipated for the remote unit while within the edge portion of the routing area.

6. A communication device for performing routing area updates, the communication device comprising:

a transceiver;

a processing unit, communicatively coupled to the transceiver,

adapted to determine at least one of

whether a remote unit is within an edge portion of a routing area or

whether the remote unit is within an end portion of a routing area update interval,

adapted to determine whether at least one condition is present for the remote unit to perform a resource-efficient routing area update, and

adapted to perform a routing area update, via the transceiver, when the at least one condition is present and when at least one of

the remote unit is determined to be within the edge portion or

the remote unit is determined to be within the end portion,

wherein being adapted to determine whether the at least one condition is present for the remote unit to perform a resource-efficient routing area update comprises at least one of

being adapted to receive signaling, from a network node via the transceiver, having a signal strength greater than a threshold signal strength value,

being adapted to determine that the remote unit detects a threshold number of signal strength bars,

being adapted to determine that the remote unit is in a coverage area in which access classes of a lowest tier of access classes are allowed, or

being adapted to determine that a loading level of a network node is below a threshold loading level.

7. The communication device of claim 6, wherein being adapted to determine whether the remote unit is within an edge portion of the routing area comprises at least one of

being adapted to receive signaling, from a network node via the transceiver, that indicates that a coverage area of the network node is part of an edge portion of the routing area, or

being adapted to determine that the remote unit has traveled more than a predetermined portion of a routing area update distance since last performing a routing area update.

8. The communication device of claim 7, wherein being adapted to receive signaling from the network node that indicates that a coverage area of the network node is part of an edge portion of the routing area comprises

being adapted to receive at least one of overhead messaging, a retry order, or a response to a previous routing area update.

9. The communication device of claim 6, wherein the threshold signal strength value is a value equivalent to one of

a predetermined threshold signal strength value or

the predetermined threshold signal strength value plus an additional signal strength amount.

10. The communication device of claim 6, wherein at least one of an increased threshold signal strength value or an increased threshold number of signal strength bars is used when at least one secondary condition is present, wherein the at least one secondary condition comprises at least one of

the remote unit is moving at a below-threshold velocity,

a paging interval for the remote unit has a below-threshold period,

the remote unit has only moved a below-threshold distance within the edge portion of the routing area, or

a greater signal strength is anticipated for the remote unit while within the edge portion of the routing area.