Inter-system handover
AssigneeNokia Corporation
InventorsJuha Bäck, Tony Hulkkonen, Kati Vainola
Life of this patent
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Abstract
A method for performing an inter-system handover of a user terminal in a telecommunications network comprising a first telecommunications system operable according to a first protocol and comprising a first service subsystem and a first access subsystem and a second telecommunications system operable according to a second protocol and comprising a second service subsystem and a second access subsystem; the user terminal storing capability data indicative of the user terminal's capabilities for communication with the service subsystems and the access subsystems.
Claims52
A method for performing an inter-system handover of a user terminal in a telecommunications network comprising a first telecommunications system operable according to a first protocol and comprising a first service subsystem and a first access subsystem and a second telecommunication system operable according to a second protocol and comprising a second service subsystem and a second access subsystem;
- the user terminal storing capability data indicative of a capability of the user terminal to communicate with the service subsystems and the access subsystems;
- the method comprising the steps of:
- transmitting initial capability data indicative of the capability of the user terminal to communicate with the first service subsystem and one of the first and second access subsystems from the user terminal to one of the first and second access subsystems;
- transmitting the initial capability data that is indicative of the capability of the user terminal to communicate with the first service subsystem from one of the first and second access subsystems to the first service subsystem;
- establishing a connection between the user terminal and the first service subsystem via one of the first and second access subsystems by means of the initial capability data;
- determining that a handover of the connection is to be performed from the first service subsystem to the second service subsystem or from one of the first and second access subsystems to the other of the first and second access subsystems;
- transmitting from the user terminal to the network further capability data indicative of the capability of the user terminal to communicate with the second service subsystem or the other of the first and second access subsystems;
- and
- handing over the connection via the further capability data.
A telecommunications apparatus, comprising:
- a telecommunications network comprising a first telecommunications system operable according to a first protocol, a first service subsystem and a first access subsystem, a second telecommunications system operable according to a second protocol, a second service subsystem, and a second access subsystem;
- and
- a user terminal for storing capability data indicative of the capability of the user terminal to communicate with the service subsystems and the access subsystems;
- the telecommunications apparatus being adapted to perform an inter-system handover by the following steps of:
- transmitting initial capability data indicative of the capability of the user terminal to communicate with the first service subsystem and one of the first and second access subsystems from the user terminal to one of the first and second access subsystems;
- transmitting the initial capability data that is indicative of the capability of the user terminal to communicate with the first service subsystem from one of the first and second access subsystems to the first service subsystem;
- establishing a connection between the user terminal and the first service subsystem via one of the first and second access subsystems based on the initial capability data;
- determining that a handover of the connection is to be performed from the first service subsystem to the second service subsystem or from one of the first and second access subsystems to the other of the first and second access subsystems;
- the user terminal transmitting to the network further capability data indicative of the capability of the user terminal to communicate with the second service subsystem or the other of the first and second access subsystems;
- and
- handing over the connection via the further capability data.
A user terminal operable in a telecommunications network comprising a first telecommunications system operable according to a first protocol and comprising:
- a first service subsystem;
- a first access subsystem;
- a second telecommunications system operable according to a second protocol;
- a second service subsystem;
- and
- a second access subsystem;
- wherein the user terminal is arranged to:
- store capability data indicative of a capability of the user terminal to communicate with the service subsystems and the access subsystems;
- transmit to one of the first and second access subsystems initial capability data indicative of the capability of the user terminal to communicate with the first service subsystem and one of the first and second access subsystems;
- determine that a handover of a connection is to be performed from the first service subsystem to the second service subsystem or from one of the first and second access subsystems to the other of the first and second access subsystems;
- and
- transmit to the network further capability data indicative of the capability of the user terminal to communicate with the second service subsystem or the other of the first and second access subsystems based on whether a handover of the connection is to be performed.
Dependencies are inferred from the claim text.