UE behavior with rejection of resume request
Systems and methods are disclosed herein relating to wireless device behavior after rejection of a resume request triggered by a Radio Access Network (RAN) based Notification Area Update (RNAU) or upon cell reselection during resume. In some embodiments, a method of operation of a wireless device comprises transmitting, to a RAN node, a Radio Resource Control (RRC) resume request triggered by an RNAU and receiving, from the RAN node, an RRC resume reject message comprising a wait timer value in response to the RRC resume request. The method further comprises starting a wait timer initialized with the wait timer value and sending the RNAU when the wait timer has expired. Corresponding embodiments of a wireless device are also disclosed. Embodiments of a wireless device and methods of operation thereof related to the behavior of the wireless device upon performing a cell reselection during resume are also disclosed.
1. A method of operation of a wireless device in a cellular communications system, the method comprising:
transmitting, to a Radio Access Network, RAN, node, a Radio Resource Control, RRC, resume request;
in response to the RRC resume request, receiving, from the RAN node, an RRC resume reject message comprising a wait timer value;
starting a wait timer initialized with the wait timer value;
performing a cell reselection to a target cell while the wait timer is running; and
upon performing the cell reselection to the target cell while the wait timer is running, re-initiating a pending Access Stratum, AS, layer procedure in the target cell.
2. The method of claim 1 further comprising:
determining whether an upper layer event has occurred;
wherein re-initiating the pending AS layer procedure in the target cell comprises re-initiating the pending AS layer procedure in the target cell if an upper layer event has occurred.
3. The method of claim 2 further comprising discarding the pending AS layer procedure if an upper layer event has occurred.
4. The method of claim 2 wherein the upper layer event is mobile originating data or mobile originating signaling.
5. The method of claim 1 wherein the pending AS layer procedure is a RAN-based Notification Area Update, RNAU, procedure.
6. A wireless device for a cellular communications system, the wireless device comprising:
radio front-end circuitry; and
processing circuitry associated with the radio front-end circuitry, the processing circuitry configured to cause the wireless device to:
transmit, to a Radio Access Network, RAN, node, a Radio Resource Control, RRC, resume request;
in response to the RRC resume request, receive, from the RAN node, an RRC resume reject message comprising a wait timer value;
start a wait timer initialized with the wait timer value;
perform a cell reselection to a target cell while the wait timer is running; and
upon performing the cell reselection to the target cell while the wait timer is running, re-initiate a pending Access Stratum, AS, layer procedure in the target cell.
7. The wireless device of claim 6 wherein the processing circuitry is further configured to cause the wireless device to:
determine whether an upper layer event has occurred;
wherein re-initiating the pending AS layer procedure in the target cell comprises being configured to re-initiate the pending AS layer procedure in the target cell if an upper layer event has occurred.
8. The wireless device of claim 7 wherein the processing circuitry is further configured to cause the wireless device to:
discard the pending AS layer procedure if an upper layer event has occurred.
9. The wireless device of claim 7 wherein the upper layer event is mobile originating data or mobile originating signaling.
10. The wireless device of claim 6 wherein the pending AS layer procedure is a RAN-based Notification Area Update, RNAU, procedure.