Intersystem handover with modified parameters
AssigneeNokia Corporation
InventorTimo Kauhanen
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Abstract
A method for a communication system that includes a first node, a second node and a third node. In the method a connection is established between the first node and the second node based on predefined parameters. Handover of the connection is initiated so that the connection may continue between the first node and the third node. A default value is used for at least one connection parameter required for said connection between the first node and the third node. If it is determined as necessary, the value of said at least one parameter is then modified after the connection has been established.
Claims24
A method in a cellular communication system wherein a mobile station is arranged to be served by a second node and a third node, said first and second nodes belonging to a first and second communication system that are based on different rules of communication, comprising the steps of:
- establishing a connection between the mobile station and the second node based on predefined parameters;
- initiating handover procedure of the connection from the first communication system to the second communication system so that the connection may continue between the mobile station and the third node;
- using a default value for at least one connection parameter required to establish the connection between the mobile station and the third node during the handover procedures, the default value being based on a quality of service parameter of the connection between the mobile station and the second node;
- and
- modifying, if determined necessary, the value of said at least one parameter.
A method as claimed in any preceding claim, wherein the second node is a controller of a packet switched communication network.
A method as claimed in any preceding claim, wherein the third node is a controller of a circuit switched communication network.
A method as claimed in claim 8, wherein the controller of the circuit switched communication network is a mobile switching centre.
A method as claimed in any preceding claim, wherein said default value of the parameter comprises a parameter indicating the number of traffic channels for a circuit switched connection.
A method as claimed in any preceding claim, wherein the default value of the parameter is determined by mapping at least one of the bearer characteristics of the connection between the mobile station and the second node in characteristic of the connection between the mobile station and the third node.
A method as claimed in any of the preceding claims, wherein the step of modifying comprises:
- transmitting modify request from the third node to the mobile station, the request containing bearer capability information and said at least one default parameter;
- determining whether the proposed default parameters are acceptable by the mobile station;
- and
- transmitting a response from the mobile station to the third node indicating the result of the determination.
A cellular communication system comprising:
- a mobile station, a second node and a third node, the second and third nodes being arranged to operate based on different rules of communication, wherein the mobile station may communicate with the second node and the third node and a connection between the mobile station and the second node can be handed over to a connection between the mobile station and the third node, the set-up of a connection between the mobile station and the third node being based on at least one parameter that is different from the parameters required for the set-up of the connection between the mobile station and the second node;
- a controller for determining a default value for said at least one different parameter based on a quality of service parameter of the connection between the mobile station and the second node to be used for setting up the connection between the mobile station and the third node during the handover procedures;
- and
- means for modifying the value of said at least one parameter.
Dependencies are inferred from the claim text.