Fast call set-up for multi-mode communication

• US 7,162,236 B2
• Filed: 04/26/2004
• Issued: 01/09/2007
• Est. Priority Date: 04/26/2004
• Status: Active Grant

• Current Assignee: Motorola Solutions, Inc.
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Dorenbosch, Jheroen P., Idnani, Ajaykumar R., Gipson, Jack A.
• Primary Examiner(s): Appiah; Charles
• Assistant Examiner(s): MARSH, OLIVIA MARIE
• Application Number:
  US10/831,822
• Publication Number:
  US 20050239498A1
• Time in Patent Office: 988 Days
• Field of Search: 455/41.2, 455/414.1, 455/417, 455/432.1, 455/434, 4554351-4353, 455436-444, 455/445, 455/452.2, 4555521-5531, 455/453.3, 455512-513, 455/426.1, 455/461, 370332-333
• US Class Current: 455/432.1
• CPC Class Codes: H04W 76/10 Connection setup
• CPC Class Codes: H04W 88/06 adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Abstract

Fast call set-up for a call to a multi-mode communication unit (102) is facilitated by a method and apparatus for registering and re-registering priorities with a SIP registrar (111). A list of contacts with first priorities associated with a mode of operation in a first enterprise network (106) is established and used. A switch to second priorities is made when a probability of a switch from the first mode of operation to a second mode of operation in a second cellular network (108) satisfies a threshold. The list of contacts includes a contact having an expiration time for the first mode of operation. A quality factor is determined and the list of contacts is re-registered and the expiration time changed if the quality factor does not satisfy a threshold.

Claims

1. A method for reducing a call setup time in a network for a call setup to a multi-mode communication unit, the method comprising:

registering, when the multi-mode communication unit starts to operate according to a first mode of operation, with a Session Initiation Protocol (SIP) registrar in the network, a list of contacts for the multi-mode communication unit having first respective priorities associated with a first mode of operation of the multi-mode communication unit, the first respective priorities including a first priority of a first contact associated with the first mode of operation and a second priority of a second contact associated with a second mode of operation, wherein the first respective priorities is higher than a second respective priorities;

using the first respective priorities when the multi-mode communication unit is operating in accordance with the first mode of operation; and

modifying the list of contacts at the SIP registrar to create a modified list of contacts, with the second respective priorities associated with the second mode of operation of the multi-mode communication unit when a probability of a switch from operation in accordance with the first mode of operation to operation in accordance with the second mode of operation satisfies a threshold, wherein the modified list of contacts having the second respective priorities including the first priority of the first contact associated with the first mode of operation and the second priority of the second contact associated with the second mode of operation, wherein the first respective priorities is not higher than the second respective priorities;

wherein the modified list of contacts having the second respective priorities includes the first priority of the first contact associated with the first mode of operation is equal to the second priority of the second contact associated with the second mode of operation.

2. A method for reducing a call setup time in a network for a call setup to a multi-mode communication unit, the call setup conducted in accordance with a protocol, the method comprising:

registering a list of contacts for the multi-mode communication unit with a Session Initiation Protocol (SIP) registrar associated with the protocol in the network, the list of contacts including a first priority of a first contact associated with a first mode of operation and a second priority of a second contact associated with a second mode of operation, wherein the first priority is higher than the second priority, the first contact having a first expiration time;

determining a quality factor associated with the first mode of operation;

re-registering the list of contacts with the SIP registrar, the list of contacts including the first contact having a reduced expiration time if the quality factor does not satisfy a first predetermined quality threshold;

re-determining the quality factor associated with the first mode of operation before the expiration of the first expiration time to provide a second quality factor; and

re-registering the list of contacts, wherein the list of contacts including the first contact having an increased expiration time if the second quality factor exceeds a second predetermined quality threshold.

3. A method for reducing a call setup time in a network for a call setup to a multi-mode communication unit, the call setup conducted in accordance with a protocol, the method comprising:

registering a list of contacts for the multi-mode communication unit with a Session Initiation Protocol (SIP) registrar associated with the protocol in the network, the list of contacts including a first priority of a first contact associated with a first mode of operation and a second priority of a second contact associated with a second mode of operation, wherein the first priority is higher than the second priority, the first contact having a first expiration time;

determining a quality factor associated with the first mode of operation; and

re-registering the list of contacts with the SIP registrar, the list of contacts including the first contact having a reduced expiration time if the quality factor does not satisfy a first predetermined quality threshold, wherein the second contact has a second expiration time according to the second mode of operation of the multi-mode communication unit; and

wherein the list of contacts includes a third contact having a third expiration time longer than the first expiration time and a third priority, where the third priority is lower than the first and the second priority.