Abstract: A communication system is described in which a base station transmits, to a UE (user equipment), via a data radio bearer (DRB), a downlink data packet that includes information identifying a data flow. The downlink data packet is transmitted prior to commencement of transmission, via that DRB, of data packets comprising any downlink user-plane data associated with the identified data flow.

Abstract: A communication system is disclosed in which a distributed base station apparatus comprises a central unit for control plane signalling (CU-CP), at least one a central unit for user plane signalling (CU-UP), and at least one distributed unit. The CU-CP obtains information indicating whether a security configuration is supported by a CU-UP and selects a security configuration for an item of user equipment (UE) based on the obtained information.

Abstract: A communication system is disclosed which a base station configures a user equipment (UE) to carry out measurements of signals transmitted in a plurality of neighbour cells and to transmit a measurement report. The UE performs the signal measurements and transmits the measurement report, which comprises the measurement results for at least one neighbour cell and further includes, for at least one reported neighbour cell, an associated unique cell identifier together with the corresponding measurement. The base station identifies a corresponding neighbour cell, from among a plurality of neighbour cells, based on the reported unique cell identifier, and triggers a communication procedure involving the UE and that neighbour cell.

Abstract: A system is disclosed in which a user equipment (UE) performs small data transmission procedure in Radio Resource Control (RRC) Inactive state using a configured grant or random access. As part of this procedure, the UE receives configuration information for controlling subsequent small data transmissions. For example, the configuration information may be used to re-activate, re-configure, or release a configured grant stored by the UE.

Abstract: A communication system is disclosed in which data is transmitted using unlicensed spectrum by employing a channel access procedure based on a channel access priority class (CAPC). In order to apply the appropriate CAPC for each transmission in accordance with the actual data flow(s) being multiplexed into the transmission, the CAPC information of each data packet is carried together with the packet down through the user plane protocol.

Abstract: In one aspect, a method performed by a base station in a Non-Public Network includes: operating a closed access group (CAG) cell; establishing a communication connection with a user equipment (UE) in the CAG cell, wherein the CAG cell is associated with a CAG having an associated CAG identifier; suspending the communication connection; receiving, from a further base station, a first message indicating that the UE has requested resumption of the communication connection in a CAG cell operated by the further base station, the first message including a CAG identifier of a CAG which the CAG cell operated by the further base station is associated with; performing CAG membership verification for the CAG identified by the CAG identifier in the first message; and sending, to the further base station, a second message indicating a result of the CAG membership verification.

Abstract: Methods and apparatus are disclosed for controlling whether a user equipment (UE) is allowed to access a cell of a closed access group (CAG) when the CAG is selected manually by a user of the UE.

Abstract: In one aspect, a method performed by a base station includes: performing a Radio Resource Control (RRC) resume procedure for a user equipment (UE) in a cell of a non-public network; obtaining i) information identifying whether or not the UE is authorised to access the cell of a non-public network or ii) information identifying at least one non-public network that the UE is authorised to access, from another base station; verifying, based on the information of i) or ii), whether the UE is authorised to access the non-public network, wherein the information of i) or ii) is stored, in a UE context for the UE in the another base station in a process of a RRC setup for the UE in another cell of a network.

Abstract: A communication system is disclosed in which a base station apparatus obtains, from at least one secondary node (SN) handling user-plane transmissions for a user equipment (UE), information identifying a total integrity protected data rate for all Protocol Data Unit (PDU) sessions associated with the UE at that SN. When the information from the at least one SN indicates that the total integrity protected data rate for all PDU sessions associated with the UE at that SN exceeds an associated data rate portion, the base station apparatus updates at least one of: said data rate portion; and at least one PDU session associated with the UE at that SN.

Abstract: A communication system is disclosed in which a distributed base station apparatus comprises a central unit for control plane signalling (CU-CP), at least one a central unit for user plane signalling (CU-UP), and at least one distributed unit. The CU-CP obtains information indicating whether a security configuration is supported by a CU-UP and selects a security configuration for an item of user equipment (UE) based on the obtained information.

Abstract: A communication system is described in which a base station transmits, to a UE (user equipment), via a data radio bearer (DRB), a downlink data packet that includes information identifying a data flow. The downlink data packet is transmitted prior to commencement of transmission, via that DRB, of data packets comprising any downlink user-plane data associated with the identified data flow.

Abstract: A communication system is disclosed which a base station configures a user equipment (UE) to carry out measurements of signals transmitted in a plurality of neighbour cells and to transmit a measurement report. The UE performs the signal measurements and transmits the measurement report, which comprises the measurement results for at least one neighbour cell and further includes, for at least one reported neighbour cell, an associated unique cell identifier together with the corresponding measurement. The base station identifies a corresponding neighbour cell, from among a plurality of neighbour cells, based on the reported unique cell identifier, and triggers a communication procedure involving the UE and that neighbour cell.