GEOGRAPHICALLY REDUNDANT AND MULTIPLE EATF NODES
First Claim
1. A method of operating a first emergency access transfer function (EATF) node, the method comprising:
- receiving a request for transferring an emergency call session (ECS) of a user equipment (UE) from a first access network to a second access network;
transferring the ECS from the first access network to the second access network (106) when the ECS is known to the first EATF node;
selecting a second EATF node from a set of one or more EATF nodes when the ECS is unknown to the first EATF node; and
forwarding the request for transferring the ECS to the second EATF node.
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Accused Products
Abstract
An emergency access transfer function (EATF) node is described for use when hand over of a user equipment (UE) from a first to a second access network is performed during an emergency call session (ECS). The EATF node receives a request for transferring the ECS from the first access network to the second access network. The EATF node transfers the ECS of the UE from the first to the second access network when the ECS is known to the EATF node. The EATF node selects a second EATF node from a set of one or more EATF nodes when the ECS is unknown, and forwards the request for transferring the ECS to the second EATF node. The EATF node may be in a first network region and the second EATF node may be in the first or a second network region.
41 Citations
24 Claims
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1. A method of operating a first emergency access transfer function (EATF) node, the method comprising:
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receiving a request for transferring an emergency call session (ECS) of a user equipment (UE) from a first access network to a second access network; transferring the ECS from the first access network to the second access network (106) when the ECS is known to the first EATF node; selecting a second EATF node from a set of one or more EATF nodes when the ECS is unknown to the first EATF node; and forwarding the request for transferring the ECS to the second EATF node. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 23)
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13. An emergency access transfer function (EATF) node, the EATF node comprising:
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a receiver, a transmitter, a memory, and a processor, the processor being connected to the receiver, to the transmitter, and to the memory, wherein; the receiver is configured to receive a request for transferring an emergency call session (ECS) of a user equipment (UE) from a first access network to a second access network; the processor is configured to; transfer the ECS of the UE from the first access network to the second access network when the ECS is known to the EATF node; select a second EATF node from a set of one or more EATF nodes when the ECS is unknown to the EATF node; and the transmitter is configured to forward the request for transferring the ECS to the second EATF node. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 24)
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Specification