Abstract:
A method and apparatus for establishing/modifying/releasing data radio bearers (DRBs) in a wireless communication system is provided. A master eNodeB (MeNB) in dual connectivity transmits a request message, which includes information on E-UTRAN radio access bearers (E-RABs) to be set up/modified/released, to a secondary eNB (SeNB) in dual connectivity through an X2 interface;\, and receives a response message, which includes radio resource control (RRC) connection reconfiguration related information based on the E-RABs to be set up/modified/released, as a response to the request message from the SeNB through the X2 interface.
Abstract:
A method and apparatus for switching off a cell for energy saving in a wireless communication system is provided. A first eNodeB (eNB) transmits information on quality of services (QoS) of user equipments (UEs), connected to the first eNB, to a macro eNB, and receives a list of recommended cells for handover of all or a part of the UEs. Then the first eNB performs handover of all or the part of the UEs with a second eNB which manages a cell included in the list of recommended cells, and switches off a cell managed by the first eNB.
Abstract:
A method and apparatus for transmitting split availability of a cell in a wireless communication system is provided. A first eNodeB (eNB) may transmit a split availability of a first cell, managed by the first eNB, to neighbor eNBs. The split availability of the first cell may indicate whether the first cell supports cell split operation or not. Alternatively, the split availability of the first cell may indicate whether the first eNB supports an active antenna system (AAS).
Abstract:
A method and apparatus for transmitting information on user equipments (UEs) in a wireless communication system is provided. A first eNodeB (eNB) transmits information on a first type of UEs and information on a second type of UEs to a second eNB. The first type of UEs is UEs located around a cell border between a first cell, controlled by the first eNB, and a second cell, controlled by the second eNB. The second type of UEs is UEs located at the other part of coverage of the first cell and the second cell.
Abstract:
A method and apparatus for handling security information between a wireless device and a network for a fast RRC release procedure in a wireless communication system will be provided. A core network node in a wireless communication system receives, from a radio access network (RAN) node, a UE context resume request message including a fast Radio Resource Control (RRC) release indication. The fast RRC release indication informs that the RAN node transmits an RRC release message to a wireless device before the core network node receives the UE context resume request message. A core network node determines to stop computation of new security information for the wireless device based on the fast RRC release indication. A core network node transmits a UE context resume response message to the RAN node.
Abstract:
A method and apparatus supporting UP security for MO-EDT in CU-DU split in a wireless communication system. A central unit (CU) receives, from a distributed unit (DU), a first message including a PDCP Data PDU, wherein the PDCP Data PDU is configured by a wireless device. A CU calculates a HASHDATA from the PDCP Data PDU. A CU verifies a Short MAC-I of the wireless device based on the HASHDATA. A CU transmits, to the DU, a second message to setup a UE context for the wireless device in the DU based on the verification.
Abstract:
A method and apparatus for saving energy for a Distributed Unit in a wireless communication system is provided. A CU establishes a connection between a Distributed Unit (DU). The CU receives, from the DU, a first message including deactivation request for the DU. The CU determines whether to permit deactivation of the DU or not. The CU transmits, to the DU, a second message in response to the first message, wherein the second message includes information informing that the deactivation request for the DU is accepted or not based on the determination.
Abstract:
A method and apparatus for lossless uplink data transmission of IAB network in a wireless communication system will be provided. A user plane (UP) of an integrated access and backhaul (IAB)-donor central unit (CU) in a wireless communication system receives, from a wireless device, uplink data through a source IAB-node. A UP of an IAB-donor CU receives, from the source IAB-node, at least one of a delivery status of the uplink data on the source IAB-node, wherein the wireless device handovers from the source IAB-node to a target IAB-node. A UP of an IAB-donor CU transmits, to a unit-control plane (CP) of the IAB-donor CU, a first message based on the at least one of the delivery status of the uplink data.
Abstract:
A method for performing uplink data fast transmission. The method includes receiving a UE context release message including a user plane ID (UPID) from control plane (CP) of a central unit (CU) of the network node, forwarding the UPID via a radio resource control (RRC) connection release message to a wireless device, receiving a RRC resume request message including user data with the UPID from the wireless device, transmitting the user data to CU based on the UPID.
Abstract:
A method and apparatus for paging for multicast and broadcast service in a wireless communication system is provided. A Distributed Unit (DU) of a Radio Access Network (RAN) node may receive, from a central unit (CU) of the RAN node, a service identity for a Multicast and/or Broadcast (MB) service. A MB session may be set for the MB service. A DU of a RAN node may transmit, to multiple User Equipments (UEs) in Connection Management (CM)-IDLE state, the service identity of the MB service. The multiple UEs may have joined to the MB session. A DU of a RAN node may receive, from at least one UE among the multiple UEs, an RRC message to request the MB service. A DU of a RAN node may forward the RRC message to the CU of the RAN node.