Abstract: A first radio terminal of a radio communications network. In one example, the first radio terminal includes an electronic processor, a communication module, and an antenna. The electronic processor is configured, together with the communication module, and the antenna, to cause the radio terminal to transmit, in a first transmission to a second radio terminal, data via a first subset of a set of SPS radio resources, reserve a second subset of the set of SPS radio resources for a subsequent data transmission, and in response to detecting a triggering event, skip the subsequent data transmission.

Abstract: A wireless communication method for dynamically adapting resource reservation of a sidelink channel using semi-persistent scheduling. The method includes receiving, at a first item of user equipment, a first and a second item of data for transmission via a semi persistent scheduling mode, and a status indication of a shared wireless resource pool of the first item of user equipment and one or more second items of user equipment; notifying, by the first item of user equipment, an initial semi persistent scheduling reservation for the first item of data to the one or more second items of user equipment via the shared resource pool; notifying, by the first item of user equipment, one or more second items of user equipment of a reservation of a wireless resource defined in the shared wireless resource pool according to a declaration comprised in a further semi-persistent scheduling reservation of the sidelink channel.

Abstract: A first radio terminal of a radio communications network. In one example, the first radio terminal includes an electronic processor, a communication module, and an antenna. The electronic processor is configured, together with the communication module, and the antenna, to cause the radio terminal to transmit, in a first transmission to a second radio terminal, data via a first subset of a set of SPS radio resources, reserve a second subset of the set of SPS radio resources for a subsequent data transmission, and in response to detecting a triggering event, skip the subsequent data transmission.

Abstract: A method to operate a first radio terminal of a radio communications network, is provided, wherein the method comprises: determining a SPS configuration for the first radio terminal, wherein the SPS configuration indicates a set of SPS, semi-persistently scheduled, radio resources of a shared device-to-device radio channel, in particular of a sidelink channel, SL-CH, wherein the indicated SPS radio resources are intended for a transmission by the first radio terminal; transmitting, towards at least one second radio terminal, data via a first subset of the set of the SPS radio resources; selecting at least one sensing resource out of the set of SPS radio resources; sensing the at least one sensing resource; determining a contention indicator in dependence on the sensing of the at least one sensing resource; and refraining from transmitting data via a second subset of the set of SPS radio resources if the contention indicator indicates a contention situation at the at least one sensing resource.

Abstract: A method for operating an apparatus (UE) comprising: determining (130), in an active mode, a state associated with a direct mode radio channel, and determining (160; 170), in the active mode, at least one subset of a plurality of radio resources of the direct mode radio channel based on the determined state.

Abstract: A method to operate a first radio terminal of a radio communications network, is provided, wherein the method comprises: determining a SPS configuration for the first radio terminal, wherein the SPS configuration indicates a set of SPS, semi-persistently scheduled, radio resources of a shared device-to-device radio channel, in particular of a sidelink channel, SL-CH, wherein the indicated SPS radio resources are intended for a transmission by the first radio terminal; transmitting, towards at least one second radio terminal, data via a first subset of the set of the SPS radio resources; selecting at least one sensing resource out of the set of SPS radio resources; sensing the at least one sensing resource; determining a contention indicator in dependence on the sensing of the at least one sensing resource; and refraining from transmitting data via a second subset of the set of SPS radio resources if the contention indicator indicates a contention situation at the at least one sensing resource.