Wireless terminal and method of operating

A method for use in wireless terminal, the wireless terminal being for communicating with a first network of first type and for communicating with a second network of second type different than the first type, the method comprising:

• performing an attachment to the first network in a packet domain and initiating a ready timer dependent on the performing the attachment, the ready timer indicating that the wireless terminal is in an attached state and has recently sent data to the first network;
• initiating an inter-system change from the first network to the second network whereby the terminal becomes detached from the first network and selects the second network in the packet domain;
• and
• rendering ineffective the ready timer depending on the initiated inter-system change.

A non-transitory computer readable medium storing a program that causes a wireless terminal, the wireless terminal for communicating with a first network of first type and for communicating with a second network of second type different than the first type, to execute a process comprising:

• performing an attachment to the first network in a packet domain and initiating a ready timer dependent on the performing the attachment, the ready timer indicating that the wireless terminal is in an attached state and has recently sent data to the first network;
• initiating an inter-system change from the first network to the second network whereby the terminal becomes detached from the first network and selects the second network in the packet domain;
• and
• rendering ineffective the ready timer depending on the initiated inter-system change.

A network apparatus for operating as part of a first network of first type and for communicating with a wireless terminal that can communicate with a second network of second type different than the first type, the network apparatus comprising a processor, wherein:

• the processor performs an attachment to the wireless terminal in a packet domain and initiates a ready timer in the network apparatus dependent on the performed attachment, the ready timer indicating that the wireless terminal is in an attached state and has recently sent data to the first network;
• the processor, during an inter-system change of the wireless terminal from the first network to the second network, performs a registration update whereby the wireless terminal becomes registered in the packet domain with the second network;
• and
• the processor renders ineffective the ready timer depending on the registration update.

A method for use in a network apparatus, the network apparatus being for operating as part of a first network of first type and for communicating with a wireless terminal that can communicate with a second network of second type different than the first type, the method comprising:

• performing an attachment to the wireless terminal in a packet domain and initiating a ready timer in the network apparatus dependent on the performing the attachment, the ready timer indicating that the wireless terminal is in an attached state and has recently sent data to the first network;
• during an inter-system change of the wireless terminal from the first network to the second network, performing a registration update whereby the wireless terminal becomes registered in the packet domain with the second network;
• and
• rendering ineffective the ready timer depending on the registration update.

A non-transitory computer readable medium storing a program that causes a network apparatus, the network apparatus being for operating as part of a first network of first type and for communicating with a wireless terminal that can communicate with a second network of second type different than the first type, to execute a process comprising:

• performing an attachment to the wireless terminal in a packet domain and initiating a ready timer in the network apparatus dependent on the performing the attachment, the ready timer indicating that the wireless terminal is in an attached state and has recently sent data to the first network;
• during an inter-system change of the wireless terminal from the first network to the second network, performing a registration update whereby the wireless terminal becomes registered in the packet domain with the second network;
• and
• rendering ineffective the ready timer depending on the registration update.

A wireless terminal for communicating with a first network of first type and for communicating with a second network of second type different than the first type, the wireless terminal comprising:

• means for performing an attachment to the first network in a packet domain and initiating a ready timer dependent on the performing the attachment, the ready timer indicating that the wireless terminal is in an attached state and has recently sent data to the first network;
• means for initiating an inter-system change from the first network to the second network whereby the wireless terminal leaves the first network and selects the second network in the packet domain;
• and
• means for rendering ineffective the ready timer depending on the initiated inter-system change.

A network apparatus for operating as part of a first network of first type and for communicating with a wireless terminal that can communicate with a second network of second type different than the first type, the network apparatus comprising:

• means for performing an attachment to the wireless terminal in a packet domain and initiating a ready timer in the network apparatus dependent on the performing the attachment, the ready timer indicating that the wireless terminal is in an attached state and has recently sent data to the first network;
• means for, during an inter-system change of the wireless terminal from the first network to the second network, performing a registration update whereby the wireless terminal becomes registered in the packet domain with the second network;
• and
• means for rendering ineffective the ready timer depending on the registration update.