Patent ID: 11877224
Assignee: NOKIA TECHNOLOGIES OY
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 5:
6. An apparatus, comprising:
at least one processor; and
at least one memory including computer program code;
the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus to perform:
transmitting a service request message;
starting a service request timer when the service request message is transmitted;
determining an expiration of the service request timer;
handling the expiration of the service request timer based on a service type of the service request message and based on a mobility management mode;
determining the service type of the service request message and the mobility management mode and for, when the service type of the service request message is other than an emergency service fallback type and the mobility management mode is an idle mobility management mode:
aborting the service request procedure;
releasing locally any allocated resources;
selectively incrementing a service request attempt counter, wherein the service request attempt counter is not incremented when the service request procedure is configured to establish a packet data unit session for emergency services, or the apparatus has an established packet data unit session for emergency services, or the apparatus is configured for high priority access, or the service request was in response to a paging or notification from a network; and
based on the service request attempt counter being equal or greater a determined threshold value performing;
starting a further timer, wherein the apparatus is configured not to attempt a further service request until an expiration of the further timer unless at least one of:
the further service request is in response to a paging or notification from a network;
the apparatus is configured for high priority access;
the further service request is configured to establish a packet data unit session for emergency services;
the apparatus has an established packet data unit session for emergency services;
the apparatus is registered in a new public land mobile network; and
when the service request was for a management object multimedia telephony voice call, providing to at least one upper layer a notification that the service request was not accepted.