Sidelink security configuration procedure for avoiding key misalignment between UE
View Patent ↗Embodiments of the disclosure provide user equipment (UE) performing unicast sidelink communication with the second UE and methods therefor. A method of a first UE that performs direct sidelink communication with a second UE includes: receiving a first indication comprising sidelink signalling; in response to receiving the first indication, performing at least one of: updating a configuration for performing a transmission/reception procedure of the first UE in order to update a key based on the updated configuration for performing a transmission/reception procedure; suspending at least one data transmission/reception procedure; and resuming at least one data transmission/reception procedure. Accordingly, the UE may control resumption of transmission/reception on the sidelink such that transmission/reception on the sidelink is only resumed when a key is appropriately updated, thereby avoiding a situation where the UE transmits a message using a key and the second UE attempts to receive said message using a different key.
1. A method of a first user equipment, UE, that performs direct sidelink communication with a second UE, the method comprising:
receiving, via a PC5 interface, a first indication from the second UE, wherein the first indication comprises a sidelink signalling, wherein the sidelink signalling comprises at least one of a PC-5 signalling, a PC5-RRC (radio resource control) signalling, and a user plane indication;
in response to receiving the first indication, suspending at least one data transmission/reception procedure;
transmitting, prior to updating a configuration for performing a transmission/reception procedure, a second indication to the second UE via the PC5 interface, wherein the configuration is a security configuration for the direct sidelink communication;
receiving, from the second UE, a third indication via the PC5 interface;
updating the configuration for performing the transmission/reception procedure of the first UE in response to receiving the third indication and updating a key based on the updated configuration for performing the transmission/reception procedure in response to receiving the third indication;
in response to updating the configuration, resuming the at least one data transmission/reception procedure; and
in response to resuming the at least one data transmission/reception procedure, transmitting a fourth indication to the second UE via the PC5 interface.
2. A first user equipment, UE, configured to perform direct sidelink, SL, communication with a second UE, the first UE comprising:
a control section;
a transmitting/receiving section; and
a memory,
wherein:
the first UE is configured to perform:
receiving, via a PC5 interface, a first indication from the second UE, wherein the first indication comprises a sidelink signalling, wherein the sidelink signalling comprises at least one of a PC-5 signalling, a PC5-RRC (radio resource control) signalling, and a user plane indication;
in response to receiving the first indication, suspending (S 41 ) at least one data transmission/reception procedure;
transmitting, prior to updating a configuration for performing a transmission/reception procedure, a second indication to the second UE via the PC5 interface, wherein the configuration is a security configuration for the direct sidelink communication;
receiving, from the second UE, a third indication via the PC5 interface;
updating the configuration for performing the transmission/reception procedure of the first UE in response to receiving the third indication and updating the key based on the updated configuration for performing the transmission/reception procedure in response to receiving the third indication;
in response to updating the configuration, resuming the at least one data transmission/reception procedure; and
in response to resuming the at least one data transmission/reception procedure, transmitting a fourth indication to the second UE via the PC5 interface.
3. A method of a second user equipment, UE, that performs direct sidelink communication with a first UE, the method comprising:
updating a configuration for performing a transmission/reception procedure of the second UE in order to update a key based on the updated configuration for performing the transmission/reception procedure and updating the key based on the updated configuration for performing the transmission/reception procedure, wherein the configuration is a security configuration for the direct sidelink communication;
suspending at least one data transmission/reception procedure;
transmitting, via a PC5 interface, a first indication to the first UE, wherein the first indication comprises a sidelink signalling to the first UE, wherein the sidelink signalling comprises at least one of a PC-5 signalling, a PC5-RRC (radio resource control) signalling, and a user plane indication, wherein the first indication controls the first UE to update the configuration for performing the transmission/reception procedure of the first UE in order to update the key based on the updated configuration for performing the transmission/reception procedure;
receiving a second indication from the first UE via the PC5 interface;
in response to receiving the second indication from the first UE, resuming the at least one data transmission/reception procedure.