Patent ID: 11924882
Assignee: NOKIA TECHNOLOGIES OY
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 10:
11. A method comprising:
selecting a resource indicator which indicates a channel resource to be used by a terminal device for non-scheduled access to a network;
transmitting the selected resource indicator to an access device of the network;
maintaining the selected resource indicator and setting a time offset for a retransmission with the selected resource indicator based on an access response received from the access device responsive to the non-scheduled access;
monitoring access responses received from the network to detect at least one used resource indicator of a channel resource that has been allocated to another terminal device for non-scheduled channel access or at least one non-allowed resource indicator;
deleting a detected used or non-allowed resource indicator from a list of resource indicators of available channel resources maintained at the terminal device;
transmitting a first scheduled transmission to the access device;
adjusting the time offset based on a feedback received from the access device;
checking if the feedback comprises at least one of the following indications:
an indicator of a layer 2 error caused by a random access channel resource collision of two or more terminal devices;
an indication of an acknowledgement or an indication that new data can be sent;
an indication of a non-acknowledgement or the lack of a new data indication or an indication that no new data shall be sent;

using a parameter to adjust the time offset;
incrementing the parameter if the feedback indicates a non-acknowledgement for layer 2;
decrementing the parameter if the feedback indicates an acknowledgement; and
maintaining the parameter if the feedback indicates a non-acknowledgement for layer 1.