In a communication system, a first central unit (CU) of a first donor node determines a first mapping that comprises a route mapping or a bearer mapping. The route mapping is between the downlink data and a downlink transmission path. The bearer mapping is between the downlink data and a downlink transmission bearer. The downlink transmission path includes a transmission path between the first CU and a target node of the downlink data through a second DU of a second donor node. The downlink transmission bearer includes a RLC channel between the second DU and a next-hop node of the second DU. The first CU then sends the first mapping to a second CU of the second donor node, and sends downlink data to the second DU of the second donor node.

This application provides a communication method. In the method, a first node receives a first radio resource control (RRC) reconfiguration message from a first donor node through a second node. After the first node receives the first RRC reconfiguration message from the second node, the first node receives first indication information from the second node. When the first node determines, based on the first indication information, that the first RRC reconfiguration message becomes effective, the first node establishes an RRC connection to a second donor node based on the first RRC reconfiguration message. In the method, the first node and the second node are nodes in a group that performs group handover, the group handover is a cross-donor node group handover, the second node is a head node or the second node is connected to a head node, and the second node is a parent node of the first node.

Provided in the present disclosure are a candidate cell configuration method and apparatus. The method includes: a central unit (CU) sending a request message to a first distribute unit (DU), the request message being used for requesting information related to candidate cell configuration for a terminal, wherein the first DU is a DU where candidate cells are located; the CU receiving the information related to candidate cell configuration, which is sent by the first DU; and the CU configuring a candidate cell for the terminal.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a source node may forward a first message between a user equipment (UE) and a core node via a distributed node, wherein the first message is a non-access stratum message. The source node may transmit, to a target node, a second message associated with a migration of the distributed node from the source node to the target node, wherein the second message identifies the forwarding of the first message. Numerous other aspects are described.

A migration apparatus for an (integrated access and backhaul) IAB-node, applicable to a first terminal equipment, the first terminal equipment comprising a terminal equipment served by a first IAB-node and/or a terminal equipment served by a descendant IAB-node of the first IAB-node includes a first memory configured to store first configuration information, the first configuration information comprising security configuration configured by a target IAB donor node, and first applying processor circuitry configured to apply the security configuration in a stored first configuration information when first indication information is obtained or the security configuration in the stored first configuration information comprises security configuration corresponding to a selected or reselected cell.

One disclosure of the present specification provides a method for establishing connection by gNB-CU. The method may comprise the steps of: transmitting a request message relating to UE context to the gNB-DU; and receiving a response message from the gNB-DU.

An apparatus for transmitting and receiving signals, the apparatus being applicable to a process of migrating an IAB-node under control of a first donor central unit (donor-CU) from a first distribution unit (DU) to a second DU, and being arranged in the first donor-CU, wherein the apparatus includes a memory, and a processor coupled to the memory and configured to transmit one or more first path migration configurations for an integrated access and backhaul node (IAB-node), and transmit one or more second path migration configurations for a child node, wherein the first path migration configurations correspond to a parent node to which a first candidate cell of the IAB-node belongs, and the second path migration configurations correspond to a parent node to which the second candidate cell of the IAB-node belongs.

A distributed radio frequency communication system facilitates communication between wireless terminals and a core network. The system includes a group of remote radio units (RRUs). Each RRU of the group of RRUs is coupled to an antenna to communicate with at least some of the mobile terminals and includes electronic circuitry to perform at least a first portion of a first-level protocol of a radio access network (RAN) and communicate over a fronthaul link. The system also includes a baseband unit (BBU) coupled to the core network and the fronthaul link, and communicably coupled to the group of RRUs over the fronthaul link. The BBU includes electronic circuitry to assign one or more RRUs, selected from the group of RRUs, to a cluster of RRUs based on one or more parameters, and to perform at least a second-level protocol of the RAN.

A method for implementing an antenna cloud node communication in an indoor high-density network and system thereof are described. When a plurality of mRRHs detect uplink signals of the user equipments and a signal-to-interference noise ratio of each uplink signal is greater than or equal to a signal-to-interference noise ratio threshold, the mRRH coverage area information corresponding to the position of the user equipment is acquired according to the numbers of the mRRHs. The mRRH coverage area information corresponding to the position of the user equipment is configured to establish an antenna cloud node cluster, represented by a matrix, and the user equipments make communication each other by using the antenna cloud node cluster.

A distributed radio frequency communication system facilitates communication between wireless terminals and a core network. The system includes a group of remote radio units (RRUs). Each RRU of the group of RRUs is coupled to an antenna to communicate with at least some of the mobile terminals and includes electronic circuitry to perform at least a first portion of a first-level protocol of a radio access network (RAN) and communicate over a fronthaul link. The system also includes a baseband unit (BBU) coupled to the core network and the fronthaul link, and communicably coupled to the group of RRUs over the fronthaul link. The BBU includes electronic circuitry to assign one or more RRUs, selected from the group of RRUs, to a cluster of RRUs based on one or more parameters, and to perform at least a second-level protocol of the RAN.