Dynamic call routing based upon identification of interworking server by user equipment
First Claim
1. A method comprising:
- receiving, by a first serving system in a first radio access network (RAN) that provides service under a first air interface protocol, an incoming call directed to a user equipment (UE);
sending, by the first serving system, to an interworking server that facilitates communications between the first RAN and a second RAN that provides service under a second air interface protocol, a page message that indicates the incoming call under the first air interface protocol, such that the interworking server provides the page message for transmission to the UE, by a base station in the second RAN, via a paging channel of the second RAN, wherein the second air interface protocol is different from the first air interface protocol;
receiving, by a second serving system in the first RAN, a page response message that is transmitted by the UE in response to the page message, wherein the page response message comprises an identifier of the interworking server inserted into the page response message by the UE, and wherein the second serving system is different from the first serving system;
based at least in part on the identifier of the interworking server, the second serving system determining that the incoming call was received by the first serving system; and
responsively initiating an inter-system handoff to handoff the incoming call from the first serving system to the second serving system.
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0 Petitions
Accused Products
Abstract
Disclosed herein are methods and systems that may help to dynamically rout calls in a communication network where circuit-switched fallback (CSFB) is implemented. In particular, a user equipment (UE) may include an identifier of an interworking server (IWS), which relayed a page message from a first access network to a second access network for transmission to the UE, in the corresponding page response message that the UE sends to the first access network. The inclusion of the IWD identifier in the page response message may allow the switch that receives the page response message to detect when the corresponding voice call was received at a different switch in the first network, and responsively initiate an inter-system handoff when this is the case.
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Citations
20 Claims
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1. A method comprising:
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receiving, by a first serving system in a first radio access network (RAN) that provides service under a first air interface protocol, an incoming call directed to a user equipment (UE); sending, by the first serving system, to an interworking server that facilitates communications between the first RAN and a second RAN that provides service under a second air interface protocol, a page message that indicates the incoming call under the first air interface protocol, such that the interworking server provides the page message for transmission to the UE, by a base station in the second RAN, via a paging channel of the second RAN, wherein the second air interface protocol is different from the first air interface protocol; receiving, by a second serving system in the first RAN, a page response message that is transmitted by the UE in response to the page message, wherein the page response message comprises an identifier of the interworking server inserted into the page response message by the UE, and wherein the second serving system is different from the first serving system; based at least in part on the identifier of the interworking server, the second serving system determining that the incoming call was received by the first serving system; and responsively initiating an inter-system handoff to handoff the incoming call from the first serving system to the second serving system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method comprising:
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receiving, by a second serving system in a first radio access network (RAN) that provides service under a first air interface protocol, a page response message that is transmitted by a user equipment (UE) in response to a page message for an incoming call under the first air interface protocol; based at least in part on an identifier of an interworking server that is included in the page response message, the second serving system determining whether or not an indication of the incoming call was previously received at the second serving system, wherein the interworking server facilitates communications between the first RAN and a second RAN that provides service under a second air interface protocol, wherein the second air interface protocol is different from the first air interface protocol; if the indication of the incoming call was not previously received at the second serving system, then the second serving system;
(a) using the identifier of the internetworking server as a basis for identifying a first serving system in the first radio access network that received the indication of the incoming call, wherein the second serving system is different from the first serving system, and (b) initiating an inter-system handoff to handoff the incoming call from the first serving system to the second serving system; andotherwise, if the indication of the incoming call was previously received at the second serving system, then the second serving system connecting the incoming call to the UE. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A method comprising:
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receiving, by a user equipment (UE), a page message, wherein the UE receives the page message via a paging channel of a second radio access network (RAN) that provides service under a second air interface protocol, wherein the page message indicates an incoming call directed to the UE has been received by a first RAN that operates under a first air interface protocol, wherein the page message comprises an identifier of an interworking server that facilitates communications between a first serving system of the first RAN and the second RAN and wherein the second air interface protocol is different from the first air interface protocol; and in response to receiving the page message that includes the identifier of the interworking server, the UE; establishing a connection under the first air interface protocol in a given coverage area of the first RAN, wherein the given coverage area is served by a given serving system; generating a page response message that includes the identifier of the interworking server so as to facilitate a determination by the given serving system as to whether or not the given serving system or a different serving system initiated transmission of the page message; and sending the generated page response message to a base station that serves the given coverage area. - View Dependent Claims (17, 18, 19, 20)
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Specification