Handling failure scenarios for voice call continuity
First Claim
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1. A method for handling failure scenarios for voice call continuity, comprising:
- receiving a failure response message from a first network that indicates a failure during a domain transfer from a first domain to a second domain;
retaining an identification of the first network in a network listing, wherein the retained identification indicates that the first network does not support call anchoring;
preparing to initiate a communication in the first network;
checking the network listing for the identification of the first network; and
avoiding initiation of the communication in the first network if the identity of the first network is included in the network listing.
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Abstract
Receipt of a failure response message in response to a domain transfer attempt is cached at a mobile device. The mobile device retains information related to the domain to indicate that the domain does not support anchoring and, thus, does not support voice call continuity. The mobile device might not attempt domain transfer for subsequent calls in the same area. In an aspect, after expiration of a configurable interval, the mobile device can re-attempt domain transfer to determine if anchoring is now supported by the domain. If the domain now supports anchoring, the identification of the domain can be removed from the domain listing.
28 Citations
22 Claims
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1. A method for handling failure scenarios for voice call continuity, comprising:
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receiving a failure response message from a first network that indicates a failure during a domain transfer from a first domain to a second domain; retaining an identification of the first network in a network listing, wherein the retained identification indicates that the first network does not support call anchoring; preparing to initiate a communication in the first network; checking the network listing for the identification of the first network; and avoiding initiation of the communication in the first network if the identity of the first network is included in the network listing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A wireless communications apparatus, comprising:
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a memory that retains instructions related to; receiving a failure response message from a first network and retaining an identification of the first network in a network listing, wherein the failure response message indicates a failure during a domain transfer from a first domain to a second domain and wherein the network listing includes identities of networks that do not support call anchoring; preparing to initiate a communication in the first network; determining if the first network is included in the network listing; avoiding initiation of the communication in the first network if the first network is included in the network listing; and a processor, coupled to the memory, configured to execute the instructions retained in the memory. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A wireless communications apparatus that manages failure scenarios for voice call continuity, comprising:
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means for receiving a failure response message from a first network that indicates a failure during a domain transfer from a first domain to a second domain; means for retaining an identification of the first network in a network listing, wherein the retained identification indicates that the first network does not support call anchoring; means for preparing to initiate a domain transfer from the first network; means for determining if the identity of the first network is included in the network listing; and means for avoiding the domain transfer if the identity of the first network is included in the network listing. - View Dependent Claims (17, 18)
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19. A computer program product, comprising:
a non-transitory computer-readable storage medium comprising; a first set of codes for causing a computer to receive a failure response message from a first network that indicates a failure during a domain transfer from a first domain to a second domain; a second set of codes for causing the computer to retain an identification of the first network in a network listing, wherein the retained identification indicates that the first network does not support call anchoring; a third set of codes for causing the computer to prepare to initiate a domain transfer from the first network; a fourth set of codes for causing the computer to review the network listing for the identification of the first network; and a fifth set of codes for causing the computer to avoid the domain transfer if the identity of the first network is included in the network listing. - View Dependent Claims (20, 21)
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22. At least one processor configured to manage failure scenarios in a wireless communications environment, comprising:
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a first module for receiving a failure response message from a first network that indicates a failure during a transfer from a first domain to a second domain; a second module for retaining an identification of the first domain in a network listing, wherein the retained identification indicates that the first network does not support call anchoring; a third module for preparing to initiate a communication in the first network; a fourth module for checking the network listing for the identification of the first network; and a fifth module for avoiding initiation of the communication in the first network if the identity of the first network is included in the network listing.
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Specification