Inter-donor cell management in integrated access and backhaul

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, an integrated access and backhaul (IAB) node may determine a cell configuration of a distributed unit (DU) of the IAB node. The cell configuration may be associated with a second IAB donor. The DU may be one of a set of DUs of the IAB node. The IAB node may have a first signaling connection to a central unit (CU) of a first IAB donor. The IAB node may provide the cell configuration associated with the second TAB donor. Numerous other aspects are provided.

FIELD OF THE DISCLOSURE

Aspects of the present disclosure generally relate to wireless communication and to techniques and apparatuses for inter-donor cell management in integrated access and backhaul (IAB).

BACKGROUND

SUMMARY

In some aspects, a method of wireless communication, performed by an integrated access and backhaul (IAB) node, may include determining a cell configuration of a distributed unit (DU) of the IAB node, the cell configuration being associated with a second IAB donor, wherein the DU is one of a set of DUs of the IAB node, and wherein the IAB node has a first signaling connection to a central unit (CU) of a first IAB donor; and providing the cell configuration associated with the second IAB donor.

In some aspects, a method of wireless communication, performed by an IAB donor, may include receiving a cell configuration of a DU of an IAB node, the cell configuration being associated with a second IAB donor, wherein the DU is one of a set of DUs of the IAB node, and wherein the IAB node has a first signaling connection to a CU of a first IAB donor; and performing one or more operations associated with a context transfer, associated with a child of the IAB node, from the first IAB donor to the second IAB donor based at least in part on the cell configuration.

In some aspects, an IAB node for wireless communication may include a memory and one or more processors coupled to the memory. The memory and the one or more processors may be configured to determine a cell configuration of a DU of the IAB node, the cell configuration being associated with a second IAB donor, wherein the DU is one of a set of DUs of the IAB node, and wherein the IAB node has a first signaling connection to a CU of a first IAB donor; and provide the cell configuration associated with the second IAB donor.

In some aspects, an IAB donor for wireless communication may include a memory and one or more processors coupled to the memory. The memory and the one or more processors may be configured to receive a cell configuration of a DU of an IAB node, the cell configuration being associated with a second IAB donor, wherein the DU is one of a set of DUs of the IAB node, and wherein the IAB node has a first signaling connection to a CU of a first IAB donor; and perform one or more operations associated with a context transfer, associated with a child of the IAB node, from the first IAB donor to the second IAB donor based at least in part on the cell configuration.

In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of an IAB node, may cause the one or more processors to determine a cell configuration of a DU of the IAB node, the cell configuration being associated with a second IAB donor, wherein the DU is one of a set of DUs of the IAB node, and wherein the IAB node has a first signaling connection to a CU of a first IAB donor; and provide the cell configuration associated with the second IAB donor.

In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of an IAB donor, may cause the one or more processors to receive a cell configuration of a DU of an IAB node, the cell configuration being associated with a second IAB donor, wherein the DU is one of a set of DUs of the IAB node, and wherein the IAB node has a first signaling connection to a CU of a first IAB donor; and perform one or more operations associated with a context transfer, associated with a child of the IAB node, from the first IAB donor to the second IAB donor based at least in part on the cell configuration.

In some aspects, an apparatus for wireless communication may include means for determining a cell configuration of a DU of the apparatus, the cell configuration being associated with a second IAB donor, wherein the DU is one of a set of DUs of the apparatus, and wherein the apparatus has a first signaling connection to a CU of a first IAB donor; and means for providing the cell configuration associated with the second IAB donor.

In some aspects, an apparatus for wireless communication may include means for receiving a cell configuration of a DU of an IAB node, the cell configuration being associated with a second IAB donor, wherein the DU is one of a set of DUs of the IAB node, and wherein the IAB node has a first signaling connection to a CU of a first IAB donor; and means for performing one or more operations associated with a context transfer, associated with a child of the IAB node, from the first IAB donor to the second IAB donor based at least in part on the cell configuration.

DETAILED DESCRIPTION

In some aspects, a base station (e.g., base station110) may include an IAB node (e.g., an IAB node410) that includes means for determining a cell configuration of a DU of the IAB node, the cell configuration being associated with a second IAB donor (e.g., a second base station110, a second IAB donor405, and/or the like), wherein the DU is one of a set of DUs of the IAB node, and wherein the IAB node has a first signaling connection to a CU of a first IAB donor (e.g., a first base station110, a first IAB donor405); means for providing the cell configuration associated with the second IAB donor; and/or the like. In some aspects, such means may include one or more components of base station110described in connection withFIG.2, such as antenna234, DEMOD232, MIMO detector236, receive processor238, controller/processor240, transmit processor220, TX MIMO processor230, MOD232, antenna234, and/or the like.

In some aspects, a base station (e.g., a base station110) may include an IAB donor (e.g., an IAB donor405) that includes means for receiving a cell configuration of a DU of an IAB node (e.g., a base station110, an IAB node410, and/or the like), the cell configuration being associated with a second IAB donor (e.g., a second base station110, a second IAB donor405, and/or the like), wherein the DU is one of a set of DUs of the IAB node, and wherein the IAB node has a first signaling connection to a CU of a first IAB donor (e.g., a first base station110, a first IAB donor405, and/or the like); means for performing one or more operations associated with a context transfer, associated with a child of the IAB node, from the first IAB donor to the second IAB donor based at least in part on the cell configuration; and/or the like. In some aspects, such means may include one or more components of base station110described in connection withFIG.2, such as antenna234, DEMOD232, MIMO detector236, receive processor238, controller/processor240, transmit processor220, TX MIMO processor230, MOD232, antenna234, and/or the like.

FIG.3is a diagram illustrating examples300of radio access networks, in accordance with the disclosure.

As shown by reference number305, a traditional (e.g., 3G, 4G, LTE, and/or the like) radio access network may include multiple base stations310(e.g., access nodes (AN)), where each base station310communicates with a core network via a wired backhaul link315, such as a fiber connection. A base station310may communicate with a UE320via an access link325, which may be a wireless link. In some aspects, a base station310shown inFIG.3may be a base station110shown inFIG.1. In some aspects, a UE320shown inFIG.3may be a UE120shown inFIG.1.

As shown by reference number330, a radio access network may include a wireless backhaul network, sometimes referred to as an integrated access and backhaul (IAB) network. In an IAB network, at least one base station is an anchor base station335that communicates with a core network via a wired backhaul link340, such as a fiber connection. An anchor base station335may also be referred to as an IAB donor (or IAB-donor). The IAB network may include one or more non-anchor base stations345, sometimes referred to as relay base stations or IAB nodes (or IAB-nodes). The non-anchor base station345may communicate directly or indirectly with the anchor base station335via one or more backhaul links350(e.g., via one or more non-anchor base stations345) to form a backhaul path to the core network for carrying backhaul traffic. Backhaul link350may be a wireless link. Anchor base station(s)335and/or non anchor base station(s)345may communicate with one or more UEs355via access links360, which may be wireless links for carrying access traffic. In some aspects, an anchor base station335and/or a non-anchor base station345shown inFIG.3may be a base station110shown inFIG.1. In some aspects, a UE355shown inFIG.3may be a UE120shown inFIG.1.

As shown by reference number365, in some aspects, a radio access network that includes an IAB network may utilize millimeter wave technology and/or directional communications (e.g., beamforming and/or the like) for communications between base stations and/or UEs (e.g., between two base stations, between two UEs, and/or between a base station and a UE). For example, wireless backhaul links370between base stations (e.g., base stations110) may use millimeter wave signals to carry information and/or may be directed toward a target base station (e.g., a base station110) using beamforming and/or the like. Similarly, the wireless access links375between a UE (e.g., a UE120) and a base station (e.g., a base station110) may use millimeter wave signals and/or may be directed toward a target wireless node (e.g., a UE and/or a base station). In this way, inter-link interference may be reduced.

The configuration of base stations and UEs inFIG.3is shown as an example, and other examples are contemplated. For example, one or more base stations illustrated inFIG.3may be replaced by one or more UEs that communicate via a UE-to-UE access network (e.g., a peer-to-peer network, a device-to-device network, and/or the like). In this case, “anchor node” may refer to a UE that is directly in communication with a base station (e.g., an anchor base station or a non-anchor base station).

FIG.4is a diagram illustrating an example400of an IAB network architecture, in accordance with the disclosure.

As shown inFIG.4, an IAB network may include an IAB donor405(shown as IAB-donor) that connects to a core network via a wired connection (shown as a wireline backhaul). For example, an Ng interface of an IAB donor405may terminate at a core network. Additionally, or alternatively, an IAB donor405may connect to one or more devices of the core network that provide a core access and mobility management function (e.g., AMF). In some aspects, an IAB donor405may include a base station110, such as an anchor base station, as described above in connection with3. As shown, an IAB donor405may include a central unit (CU), which may perform access node controller (ANC) functions, AMF functions, and/or the like. The CU may configure one or more distributed units (DUs) of the IAB donor405and/or may configure one or more IAB nodes410(e.g., an MT and/or one or more DUs of an IAB node410) that connect to the core network via the IAB donor405. Thus, a CU of an IAB donor405may control and/or configure the entire IAB network that connects to the core network via the IAB donor405, such as by using control messages and/or configuration messages (e.g., a radio resource control (RRC) configuration message, an F1 application protocol (F1AP) message, and/or the like).

As further shown inFIG.4, the IAB network may include IAB nodes410(shown as IAB-node 1, IAB-node 2, and IAB-node 3) that connect to the core network via the IAB donor405. As shown, an IAB node410may include mobile termination (MT) functions (also sometimes referred to as UE functions (UEF)) and may include DU functions (also sometimes referred to as access node functions (ANF)). The MT functions of an IAB node410(e.g., a child node) may be controlled and/or scheduled by another IAB node410(e.g., a parent node of the child node) and/or by an IAB donor405. The DU functions of an IAB node410(e.g., a parent node) may control and/or schedule other IAB nodes410(e.g., child nodes of the parent node) and/or UEs120. Thus, a DU may be referred to as a scheduling node or a scheduling component, and an MT may be referred to as a scheduled node or a scheduled component. In some aspects, an IAB donor405may include DU functions and not MT functions. That is, an IAB donor405may configure, control, and/or schedule communications of IAB nodes410and/or UEs120. A UE120may include only MT functions, and not DU functions. That is, communications of a UE120may be controlled and/or scheduled by an IAB donor405and/or an IAB node410(e.g., a parent node of the UE120).

When a first node controls and/or schedules communications for a second node (e.g., when the first node provides DU functions for the second node's MT functions), the first node may be referred to as a parent node of the second node, and the second node may be referred to as a child node of the first node. A child node of the second node may be referred to as a grandchild node of the first node. Thus, a DU function of a parent node may control and/or schedule communications for child nodes of the parent node. A parent node may be an IAB donor405or an IAB node410, and a child node may be an IAB node410or a UE120. Communications of an MT function of a child node may be controlled and/or scheduled by a parent node of the child node.

As further shown inFIG.4, a link between a UE120(e.g., which only has MT functions, and not DU functions) and an IAB donor405, or between a UE120and an IAB node410, may be referred to as an access link415. Access link415may be a wireless access link that provides a UE120with radio access to a core network via an IAB donor405, and optionally via one or more IAB nodes410. Thus, the network illustrated in 4 may be referred to as a multi-hop network or a wireless multi-hop network.

As further shown inFIG.4, a link between an IAB donor405and an IAB node410or between two IAB nodes410may be referred to as a backhaul link420. Backhaul link420may be a wireless backhaul link that provides an IAB node410with radio access to a core network via an IAB donor405, and optionally via one or more other IAB nodes410. In an IAB network, network resources for wireless communications (e.g., time resources, frequency resources, spatial resources, and/or the like) may be shared between access links415and backhaul links420. In some aspects, a backhaul link420may be a primary backhaul link or a secondary backhaul link (e.g., a backup backhaul link). In some aspects, a secondary backhaul link may be used if a primary backhaul link fails, becomes congested, becomes overloaded, and/or the like. For example, a backup link425between IAB-node 2 and IAB-node 3 may be used for backhaul communications if a primary backhaul link between IAB-node 2 and IAB-node 1 fails. As used herein, “node” or “wireless node” may refer to an IAB donor405or an IAB node410.

In an IAB network, a CU of an IAB donor (e.g., a base station110, an IAB donor405) may communicate with a DU over an F1 connection (e.g., a connection on an F1 interface). The DU may be, for example, a DU of the IAB donor or a DU of an IAB node (e.g., another base station110, an IAB node410). The F1 connection may be used, for example, to exchange control plane messages. To establish an F1 connection, the DU sends, to the CU, an F1 setup request message including a list of cells that are configured on the DU and ready to be activated. The CU sends, to the DU, an F1 setup response message that optionally includes a list of cells to be activated. Here, each served cell on the DU is identified by a cell global identity (CGI) and a physical cell identifier (PCI) (i.e., a CGI-PCI pair).

As indicated above, the CGI is an identifier of a cell at a DU (e.g., a DU of an IAB donor or a DU of an IAB node). In an NR network, the CGI is referred to as an NR-CGI (NCGI), and includes a public land mobile network (PLMN) identifier, and an NR cell identifier (NCI). The PLMN identifier includes a mobile country code (MCC) and a mobile network code (MNC), while the NCI includes a base station identifier (e.g., a gNB-ID) and local cell identifier. The base station identifier is unique to a base station and, thus, is common for all cells (e.g., at IAB donor DUs and IAB node DUs) served by the base station. Equivalently, the PLMN identifier plus the base station identifier globally identifies the base station. The PCI is an identifier for a cell. Notably, there are a limited number of possible PCI values supported in a 5G system. Therefore, the same PCI can be reused by multiple cells (e.g., cells in geographically separated cells). Multiple cells having the same PCI can be distinguished by their CGIs (e.g., NCGIs). In an NR network, the PCI is broadcast by a base station in a synchronization signal (e.g., a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and/or the like) within a synchronization signal block (SSB) and can be used to determine a scrambling sequence of some physical signals and/or physical channels (e.g., a physical broadcast channel (PBCH), a physical downlink control channel (PDCCH) control resource set 0 (CORESET0), a cell-specific physical downlink shared channel (PDSCH) transmission, and/or the like).

Generally, in an IAB network, a CU can be connected to one or more DUs, but a given DU can be connected to only one CU. Some exceptions include a network sharing scenario with multiple cell identity broadcasts where each cell identity associated with a subset of PLMNs corresponds to a DU and the CU that the DU is connected to (i.e., the corresponding DUs share the same physical layer cell resources) or a scenario in which a DU is connected to multiple CUs by an appropriate implementation for the purpose of resiliency.

In some deployments, an IAB node includes multiple physical DUs, and each of the multiple physical DUs can have an F1 connection to a respective one of multiple IAB donor CUs. Additionally, in some deployments, an IAB node includes a single physical DU but multiple logical DUs, and each of the multiple logical DUs can have an F1 connection to a respective one of multiple IAB donor CUs. In a scenario in which an IAB node has multiple DUs (e.g., multiple physical DUs and/or multiple logical DUs on a single physical DU), a cell configuration associated with a first F1 interface instance towards a CU of a first IAB donor may need to be shared with a CU of a second IAB donor on a second F1 interface instance associated with the CU of the second IAB donor (i.e., on the F1 interface instance that terminates at the same IAB node). The cell configuration may be needed, for example, to perform one or more operations associated with a context transfer, associated with a child of the IAB node, from the first IAB donor to the second IAB donor (e.g., a handover, a secondary node (SN) addition, an SN change, and/or the like).

Some aspects described herein provide techniques and apparatuses for inter-donor cell management in IAB. In some aspects, an IAB node may determine a cell configuration of a DU of the IAB node, where the cell configuration is associated with a second IAB donor and the IAB node has a first signaling connection to a CU of a first IAB donor. The IAB node may provide the cell configuration associated with the second IAB donor (e.g., to the first IAB donor and/or to the second IAB donor). In some aspects, an IAB donor (e.g., the first IAB donor or the second IAB donor) may receive the cell configuration of the DU) of the IAB node, and may perform one or more operations associated with a context transfer, associated with a child of the IAB node, from the first IAB donor to the second IAB donor based at least in part on the cell configuration. Additional details are provided below.

FIGS.5A and5Bare diagrams illustrating examples500and550, respectively, associated with inter-donor cell management in IAB, in accordance with the present disclosure. In the IAB network shown inFIGS.5A and5B, an IAB node (e.g., a base station110, an IAB node410, and/or the like) includes an MT and a set of DUs including DUa and DUb. Here, DUa and DUb may be separate logical DUs implemented on a single physical DU, or may be separate physical DUs of the IAB node. As indicated, a UE (e.g., a UE120) is connected to a cell activated on DUa.

As further shown, a first IAB donor (identified as IAB donor 1) includes a first CU (identified as CU1). The first CU is connected (e.g., via an IP connection) to a DU identified as DUc. Here, DUc may be a DU of the first IAB donor or may be a DU of another IAB node (e.g., an IAB node that is between the IAB node and the first IAB donor in the IAB network). Similarly, a second IAB donor (identified as IAB donor 2) includes a second CU (identified as CU2). The second CU is connected (e.g., via an IP connection) to a DU identified as DUd. Here, DUd may be a DU of the second IAB donor or may be a DU of another IAB node (e.g., an IAB node that is between the IAB node and the second IAB donor in the IAB network).

As further shown, an MT of the IAB node has a connection (e.g., an NR connection) with DUc. Further, in this example, DUa has a first signaling connection (e.g., an F1 connection) with the first CU of the first IAB donor. In some aspects, the first signaling connection may include an F1 connection (i.e., a connection over an F1 interface), as indicated inFIGS.5A and5B. Additionally, or alternatively, the first signaling connection may include an RRC connection.

As shown by reference505inFIG.5Aand by reference555inFIG.5B, the IAB node may determine a cell configuration of DUb of the IAB node. In some aspects, the cell configuration is associated with the second IAB donor.

In some aspects, the IAB node may determine the cell configuration based at least in part on the cell configuration being received from the second CU of the second IAB donor. For example, the IAB node may receive the cell configuration on a second signaling connection. In some aspects, the second signaling connection may include an F1 connection (e.g., between the second CU and DUb) and/or an RRC connection. In some aspects, the IAB node may receive the cell configuration from the second CU of the second IAB donor based at least in part on a request provided to the second CU of the second IAB donor on the second signaling connection. In some aspects, the cell configuration may be received by DUb, DUa, or another DU of the IAB node (not shown).

In some aspects, the IAB node may determine the cell configuration based at least in part on the cell configuration being received from the first CU of the first IAB donor. For example, the IAB node may receive the cell configuration on the first signaling connection. In some aspects, the IAB node may receive the cell configuration from the first CU of the first IAB donor based at least in part on a request provided to the first CU of the first IAB donor on the first signaling connection. In some aspects, the cell configuration may be received by DUa, DUb, or another DU of the IAB node (not shown).

In some aspects, the IAB node may determine the cell configuration based at least in part on the cell configuration being configured on the IAB node by a network operator. That is, in some aspects, the cell configuration may be preconfigured by the network operator on the IAB node.

Notably, the manner in which the IAB node determines the cell configuration (e.g., based at least in part on being received from the second CU, based at least in part on being received from the first CU, and/or based at least in part on configuration by the network operator) may depend upon a network entity (e.g., the first IAB donor, the second IAB donor, or the network operator) that is responsible for reconfiguration of cells when the IAB node moves from a base station of the first IAB donor to a base station of the second IAB donor.

In some aspects, the cell configuration includes configuration information associated with one or more cells served by and/or activated on a DU of the IAB node and/or information associated with the second IAB donor. For example, in some aspects, the cell configuration may be associated with one or more cells served by DUb and/or one or more cells activated by the second IAB donor on DUb.

As another example, in some aspects, the cell configuration includes a CGI (e.g., an NCGI, an E-UTRA CGI, and/or the like) that includes an identifier (e.g., a gNB identifier, an ng-eNB identifier, and/or the like) of the second IAB donor.

As another example, in some aspects, the cell configuration includes a PCI associated with a cell served by DUb or activated on DUb.

As another example, in some aspects, the cell configuration includes mapping information associated with mapping a CGI or a PCI to a cell associated with the first IAB donor and served by a particular DU of the IAB node (e.g., DUb, DUa, or another DU of the IAB node).

As another example, in some aspects, the cell configuration includes mapping information associated with mapping a CGI or a PCI to a cell associated with the first IAB donor and activated by the first CU of the first IAB donor on a particular DU of the IAB node (e.g., DUb, DUa, or another DU of the IAB node).

As another example, in some aspects, the cell configuration includes activation status information associated with one or more cells served by DUb (e.g., information indicating whether a given cell is activated).

As another example, in some aspects, the cell configuration includes cell information associated with a cell served by or activated on DUb. The cell information associated with the cell may include information that indicates, for example, a PLMN identifier, an area code associated with the cell, a frequency associated with the cell, a bandwidth associated with the cell, a direction (e.g., uplink, downlink, and/or the like) associated with the cell, a size associated with the cell, a mode associated with the cell (e.g., time-division duplexing (TDD) mode, frequency division duplexing (FDD) mode), a TDD configuration associated with the cell, a measurement timing configuration associated with the cell, access information associated with the cell, or connectivity support information associated with the cell (e.g., an indication of whether dual connectivity is supported), and/or another type of information.

In some aspects, when the IAB node receives the cell configuration from the second IAB donor, the cell configuration may be based at least in part on a cell configuration associated with the first IAB donor. That is, when the second CU of the second IAB donor is to provide the cell configuration to the IAB node, the cell configuration may be determined (e.g., by the second IAB donor) based at least in part on another cell configuration associated with the first IAB donor. In some aspects, the IAB node may receive the other cell configuration from the first CU of the first IAB donor (e.g., on the first signaling connection), and may provide the other cell configuration to the second CU of the second IAB donor (e.g., on the second signaling connection). In some aspects, the IAB node may provide the other cell configuration to the second CU of the second IAB donor based at least in part on the second signaling connection being established with the second IAB donor. That is, in some aspects, the establishment of the second signal connection may trigger the IAB node to provide the other cell configuration to the second donor CU.

In some aspects, the cell configuration may be based at least in part on a cell mapping associated with the other cell configuration. That is, in some aspects, the cell configuration may be based at least in part on a cell mapping (e.g., performed by the second CU, the first CU, or the IAB node) association with generating mapping information (e.g., mapping information associated with mapping a CGI or a PCI to a cell associated with the first IAB donor and served by a particular DU of the IAB node, or mapping information associated with mapping a CGI or a PCI to a cell associated with the first IAB donor and activated by the first CU of the first IAB donor on a particular DU of the IAB node). In some aspects, the cell configuration may be based at least in part on changing a PCI included in the other cell configuration. That is, in some aspects, the cell configuration may be based at least in part on a PCI change (e.g., performed by the second CU, the first CU, or by the IAB node) performed in association with preventing a PCI collision. In some aspects, the cell configuration includes a PCI included in the other cell configuration. That is, in some aspects, a PCI change may not be performed in association with generating the cell configuration, meaning that a PCI in the cell configuration may match a PCI included in the other cell configuration, which may reduce service disruption at child MTs and/or child UEs of the IAB node.

In some aspects, after determining the cell configuration associated with the second IAB donor, the IAB node may provide the cell configuration. For example, as shown by reference510inFIG.5A, the IAB node may provide the cell configuration to the first CU of the first IAB donor, in some aspects (e.g., when the IAB node receives the cell configuration from the second CU or when the IAB node determines the cell configuration). In some aspects, the IAB node may provide the cell configuration to the first CU on the first signaling connection, on an RRC connection, via DUc, and/or in another manner. In some aspects, the IAB node may provide the cell configuration to the first CU based at least in part on establishment of the second signaling connection. In some aspects, the IAB node may provide the cell configuration to the first CU based at least in part on an addition, a deletion, or a change of a configuration of a cell (e.g., a served cell or an activated cell) associated with the second IAB donor. In some aspects, the IAB node may provide the cell configuration to the first CU based at least in part on a request received from the first CU. In some aspects, the IAB node may provide the cell configuration to the first CU based at least in part on a configuration provided by the first CU (e.g., the cell configuration may be provided as configured by the first CU).

As another example, as shown by reference560inFIG.5B, the IAB node may provide the cell configuration to the second CU of the second IAB donor, in some aspects (e.g., when the IAB node receives the cell configuration from the first CU or when the IAB node determines the cell configuration). In some aspects, the IAB node may provide the cell configuration to the second CU on the second signaling connection, on an RRC connection, via DUd, and/or in another manner. In some aspects, the IAB node may provide the cell configuration to the second CU based at least in part on establishment of the second signaling connection. In some aspects, the IAB node may provide the cell configuration to the second CU based at least in part on a request received from the second CU. In some aspects, the IAB node may provide the cell configuration to the second CU based at least in part on a configuration provided by the second CU (e.g., the cell configuration may be provided as configured by the second CU).

In some aspects, the IAB donor to which the cell configuration is provided (e.g., the first CU of the first IAB donor or the second CU of the second IAB donor) may receive the cell configuration, and may perform one or more operations associated with a context transfer of a child, associated with the IAB node, from the first IAB donor to the second IAB donor based at least in part on the cell configuration.

For example, as shown by reference515inFIG.5A, when the IAB node provides the cell configuration to the first CU, the first CU may receive the cell configuration and may perform one or more operations associated with a context transfer of the UE (i.e., the child of the IAB node connected to cell activated on DUa) from the first IAB donor to the second IAB donor. As a particular example, in some aspects, since the UE is initially connected to the first IAB donor, the first CU may initiate the context transfer of the UE and may indicate a target cell for the UE associated with the context transfer. In some aspects, the first CU may perform the one or more operations based at least in part on the cell configuration (e.g., received in the manner described in association withFIG.5A). As another example, as shown by reference565inFIG.5B, when the IAB node provides the cell configuration to the second CU, the second CU may receive the cell configuration and may perform one or more operations associated with a context transfer of the UE from the first IAB donor to the second IAB donor. As a particular example, in some aspects, the second CU may identify the target cell indicated by the first CU and may acknowledge the context transfer of the UE. In some aspects, the second CU may perform the one or more operations based at least in part on the cell configuration (e.g., received in the manner described in association withFIG.5B).

In some aspects, the context transfer includes a handover (e.g., a handover of the UE from a cell of DUa to a cell of DUb). In some aspects, the context transfer includes addition of the second IAB donor as an SN. For example, the first IAB donor may be a master node (MN) and the context transfer may include adding the second IAB donor as an SN. In some aspects, the context transfer includes changing an SN from the first IAB donor to the second IAB donor. For example, a third IAB donor (not shown) may be an MN and the first IAB donor may be an SN. Here, the context transfer may include changing the SN from being the first IAB donor to being the second IAB donor.

In some aspects, the techniques described in association withFIGS.5A and5Bmay be used in association with providing a cell configuration, associated with a second IAB node, for enabling inter-donor cell management in an IAB network. For example, an IAB node may be a mobile node moving from a territory of a first base station (a first IAB donor with a first CU) to a territory of a second base station (a second IAB donor with a second CU). Here, the IAB node may have a first DU and a second DU, where the first DU has a connection to the first CU. In this example, the second DU may provide, to the second CU, a list of served cells of which the second CU activates a subset. Further, the second DU of the IAB node may provide, to the second CU, a cell configuration associated with the first IAB donor (e.g., a list of cells activated on the first DU by the first CU). Based at least in part on the cell configuration, the second CU may then activate a mapped PCI list such that PCI collision is avoided and PCI change is minimized. The second CU can then provide a mapped NCGI list in which new NCGIs carry a base station identifier of the second base station. In this way, the CUs are enabled to manage an NCGI change (e.g., rather than pre-configuring one NCGI list per base station on the DU of the IAB node).

As another example, an IAB node may be a stationary node at a border of a first base station (a first IAB donor with a first CU) to a territory of a second base station (a second IAB donor with a second CU). Here, the IAB node may have a first DU and a second DU, and an MT of the IAB node may have an RRC connection to the first CU. In this example, the first DU may provide, to the first CU, a list of served cells of which the first CU activates a subset. Further, the first DU of the IAB node may provide, to the first CU, a cell configuration associated with the second IAB donor (e.g., a list of cells activated on the second DU of the IAB node by the second CU on a previously established F1 connection). Based at least in part on the cell configuration, the first CU can then indicate a target NCGI on the second DU in a UE context transfer to the second CU triggered by, for example, a handover, an SN addition, or an SN change of the MT of the IAB node (or an MT of an upstream IAB node) to the second CU.

As indicated above,FIGS.5A and5Bare provided as examples. Other examples may differ from what is described with respect toFIGS.5A and5B.

FIG.6is a diagram illustrating an example process600performed, for example, by an IAB node, in accordance with the present disclosure. Example process600is an example where the IAB node (e.g., a base station110, an IAB node410, and/or the like) performs operations associated with inter-donor cell management in IAB.

As shown inFIG.6, in some aspects, process600may include determining a cell configuration of a DU of the IAB node, the cell configuration being associated with a second IAB donor, wherein the DU is one of a set of DUs of the IAB node, and wherein the IAB node has a first signaling connection to a CU of a first IAB donor (block610). For example, the IAB node (e.g., using transmit processor220, receive processor238, controller/processor240, memory242, and/or the like) may determine a cell configuration of a DU of the IAB node, the cell configuration being associated with a second IAB donor (e.g., a second base station110, a second IAB donor405, and/or the like), as described above. In some aspects, the DU is one of a set of DUs of the IAB node. In some aspects, the IAB node has a first signaling connection to a CU of a first IAB donor (e.g., a first base station110, a first IAB donor405, and/or the like).

As further shown inFIG.6, in some aspects, process600may include providing the cell configuration associated with the second IAB donor (block620). For example, the IAB node (e.g., using transmit processor220, receive processor238, controller/processor240, memory242, and/or the like) may provide the cell configuration associated with the second IAB donor, as described above.

In a first aspect, the first signaling connection is a connection over an F1 interface.

In a second aspect, alone or in combination with the first aspect, the first signaling connection is a radio resource control connection.

In a third aspect, alone or in combination with one or more of the first and second aspects, the cell configuration is determined based at least in part on the cell configuration being received from a CU of the second IAB donor on a second signaling connection, the cell configuration being received by the DU or by another DU of the set of DUs.

In a fourth aspect, alone or in combination with one or more of the first through third aspects, the second signaling connection is a connection over an F1 interface.

In a fifth aspect, alone or in combination with one or more of the first through fourth aspects, the second signaling connection is a radio resource control connection.

In a sixth aspect, alone or in combination with one or more of the first through fifth aspects, the cell configuration is received from the CU of the second IAB donor based at least in part on a request provided to the CU of the second IAB donor on the second signaling connection.

In a seventh aspect, alone or in combination with one or more of the first through sixth aspects, the cell configuration is determined based at least in part on the cell configuration being received from the CU of the first IAB donor, the cell configuration being received by the DU or by another DU of the set of DUs.

In an eighth aspect, alone or in combination with one or more of the first through seventh aspects, the cell configuration is received from the CU of the first IAB donor based at least in part on a request provided to the CU of the first IAB donor on the first signaling connection.

In a ninth aspect, alone or in combination with one or more of the first through eighth aspects, the cell configuration is determined based at least in part on the cell configuration being configured on the IAB node by a network operator.

In a tenth aspect, alone or in combination with one or more of the first through ninth aspects, the cell configuration is associated with one or more cells served by the DU.

In an eleventh aspect, alone or in combination with one or more of the first through tenth aspects, the cell configuration is associated with one or more cells activated by the second IAB donor on the DU.

In a twelfth aspect, alone or in combination with one or more of the first through eleventh aspects, the cell configuration includes a cell global identity that includes an identifier of the second IAB donor.

In a thirteenth aspect, alone or in combination with one or more of the first through twelfth aspects, the cell configuration includes a physical cell identifier associated with a cell served by the DU or activated on the DU.

In a fourteenth aspect, alone or in combination with one or more of the first through thirteenth aspects, the cell configuration includes mapping information associated with mapping a cell global identity or a physical cell identifier to a cell associated with the first IAB donor and served by a particular DU of the IAB node, the particular DU being the DU or another DU of the set of DUs.

In a fifteenth aspect, alone or in combination with one or more of the first through fourteenth aspects, the cell configuration includes mapping information associated with mapping a cell global identity or a physical cell identifier to a cell associated with the first IAB donor and activated by the CU of the first IAB donor on a particular DU of the IAB node, the particular DU being the DU or another DU of the set of DUs.

In a sixteenth aspect, alone or in combination with one or more of the first through fifteenth aspects, the cell configuration includes activation status information associated with one or more cells served by the DU.

In a seventeenth aspect, alone or in combination with one or more of the first through sixteenth aspects, the cell configuration includes cell information associated with a cell served by or activated on the DU, the cell information associated with the cell including at least one of a public land mobile network identifier, an area code associated with the cell, a frequency associated with the cell, a bandwidth associated with the cell, a direction associated with the cell, a size associated with the cell, a mode associated with the cell, a time-division duplexing configuration associated with the cell, a measurement timing configuration associated with the cell, access information associated with the cell, or connectivity support information associated with the cell.

In an eighteenth aspect, alone or in combination with one or more of the first through seventeenth aspects, the cell configuration is based at least in part on another cell configuration associated with the first IAB donor and is determined based at least in part on the cell configuration being received from a CU of the second IAB donor.

In a nineteenth aspect, alone or in combination with one or more of the first through eighteenth aspects, the other cell configuration is received from the CU of the first IAB donor on the first signaling connection.

In a twentieth aspect, alone or in combination with one or more of the first through nineteenth aspects, the other cell configuration is provided to the CU of the second IAB donor.

In a twenty-first aspect, alone or in combination with one or more of the first through twentieth aspects, the other cell configuration is provided based at least in part on establishment of a second signaling connection with the second IAB donor.

In a twenty-second aspect, alone or in combination with one or more of the first through twenty-first aspects, the cell configuration is based at least in part on a cell mapping associated with the other cell configuration.

In a twenty-third aspect, alone or in combination with one or more of the first through twenty-second aspects, the cell configuration is based at least in part on changing a physical cell identifier included in the other cell configuration.

In a twenty-fourth aspect, alone or in combination with one or more of the first through twenty-third aspects, the cell configuration includes a physical cell identifier included in the other cell configuration.

In a twenty-fifth aspect, alone or in combination with one or more of the first through twenty-fourth aspects, the cell configuration is provided to the CU of the first IAB donor on the first signaling connection.

In a twenty-sixth aspect, alone or in combination with one or more of the first through twenty-fifth aspects, the cell configuration is provided based at least in part on establishment of a second signaling connection with the second IAB donor.

In a twenty-seventh aspect, alone or in combination with one or more of the first through twenty-sixth aspects, the cell configuration is provided based at least in part on an addition, a deletion, or a change of a configuration of a cell associated with the second IAB donor.

In a twenty-eighth aspect, alone or in combination with one or more of the first through twenty-seventh aspects, the cell configuration is provided based at least in part on a request received from the CU of the first IAB donor.

In a twenty-ninth aspect, alone or in combination with one or more of the first through twenty eighth aspects, the cell configuration is provided based at least in part on a configuration provided by the CU of the first IAB donor.

In a thirtieth aspect, alone or in combination with one or more of the first through twenty-ninth aspects, the cell configuration is provided to a CU of the second IAB donor on a second signaling connection.

In a thirty-first aspect, alone or in combination with one or more of the first through thirtieth aspects, the cell configuration is to be used in association with a context transfer, associated with a child of the IAB node, from the first IAB donor to the second IAB donor based at least in part on the cell configuration.

In a thirty-second aspect, alone or in combination with one or more of the first through thirty first aspects, the context transfer includes a handover.

In a thirty-third aspect, alone or in combination with one or more of the first through thirty-second aspects, the context transfer includes addition of the second IAB donor as a secondary node, the first IAB donor being a master node.

In a thirty-fourth aspect, alone or in combination with one or more of the first through thirty-third aspects, the context transfer includes changing a secondary node from the first IAB donor to the second IAB donor.

FIG.7is a diagram illustrating an example process700performed, for example, by an IAB donor, in accordance with the present disclosure. Example process700is an example where the IAB donor (e.g., a base station110, an IAB donor405, and/or the like) performs operations associated with inter-donor cell management in IAB.

As shown inFIG.7, in some aspects, process700may include receiving a cell configuration of a DU of an IAB node, the cell configuration being associated with a second IAB donor, wherein the DU is one of a set of DUs of the IAB node, and wherein the IAB node has a first signaling connection to a CU of a first IAB donor (block710). For example, the IAB donor (e.g., using transmit processor220, receive processor238, controller/processor240, memory242, and/or the like) may receive a cell configuration of a DU of an IAB node (e.g., a base station110, an IAB node410, and/or the like), the cell configuration being associated with a second IAB donor (e.g., a second base station110, a second IAB donor405, and/or the like), as described above. In some aspects, the DU is one of a set of DUs of the IAB node. In some aspects, the IAB node has a first signaling connection to a CU of a first IAB donor (e.g., a first base station110, a first IAB donor405, and/or the like).

As further shown inFIG.7, in some aspects, process700may include performing one or more operations associated with a context transfer, associated with a child of the IAB node, from the first IAB donor to the second IAB donor based at least in part on the cell configuration (block720). For example, the base station (e.g., using transmit processor220, receive processor238, controller/processor240, memory242, and/or the like) may perform one or more operations associated with a context transfer, associated with a child of the IAB node, from the first IAB donor to the second IAB donor based at least in part on the cell configuration, as described above.

In a first aspect, the IAB donor is the first IAB donor, and the cell configuration is received on the first signaling connection.

In a second aspect, alone or in combination with the first aspect, the first signaling connection is a connection over an F1 interface.

In a third aspect, alone or in combination with one or more of the first and second aspects, the first signaling connection is a radio resource control connection.

In a fourth aspect, alone or in combination with one or more of the first through third aspects, the IAB donor is the second IAB donor, and the cell configuration is received on a second signaling connection.

In a fifth aspect, alone or in combination with one or more of the first through fourth aspects, the second signaling connection is a connection over an F1 interface.

In a sixth aspect, alone or in combination with one or more of the first through fifth aspects, the second signaling connection is a radio resource control connection.

In a seventh aspect, alone or in combination with one or more of the first through sixth aspects, the cell configuration is received from the DU or from another DU of the set of DUs.

In an eighth aspect, alone or in combination with one or more of the first through seventh aspects, the cell configuration is associated with one or more cells served by the DU.

In a ninth aspect, alone or in combination with one or more of the first through eighth aspects, the cell configuration is associated with one or more cells activated by the second IAB donor on the DU.

In a tenth aspect, alone or in combination with one or more of the first through ninth aspects, the cell configuration includes a cell global identity that includes an identifier of the second IAB donor.

In an eleventh aspect, alone or in combination with one or more of the first through tenth aspects, the cell configuration includes a physical cell identifier associated with a cell served by the DU or activated on the DU.

In a twelfth aspect, alone or in combination with one or more of the first through eleventh aspects, the cell configuration includes mapping information associated with mapping a cell global identity or a physical cell identifier to a cell associated with the first IAB donor and served by a particular DU of the IAB node, the particular DU being the DU or another DU of the set of DUs.

In a thirteenth aspect, alone or in combination with one or more of the first through twelfth aspects, the cell configuration includes mapping information associated with mapping a cell global identity or a physical cell identifier to a cell associated with the first IAB donor and activated by the CU of the first IAB donor on a particular DU of the IAB node, the particular DU being the DU or another DU of the set of DUs.

In a fourteenth aspect, alone or in combination with one or more of the first through thirteenth aspects, the cell configuration includes activation status information associated with one or more cells served by the DU.

In a fifteenth aspect, alone or in combination with one or more of the first through fourteenth aspects, the cell configuration includes cell information associated with a cell served by or activated on the DU, the cell information associated with the cell including at least one of a public land mobile network identifier, an area code associated with the cell, a frequency associated with the cell, a bandwidth associated with the cell, a direction associated with the cell, a size associated with the cell, a mode associated with the cell, a time-division duplexing configuration associated with the cell, a measurement timing configuration associated with the cell, access information associated with the cell, or connectivity support information associated with the cell.

In a sixteenth aspect, alone or in combination with one or more of the first through fifteenth aspects, the cell configuration is based at least in part on another cell configuration associated with the first IAB donor.

In a seventeenth aspect, alone or in combination with one or more of the first through sixteenth aspects, the IAB donor is the first IAB donor, and the other cell configuration is provided by the CU of the first IAB donor on the first signaling connection.

In an eighteenth aspect, alone or in combination with one or more of the first through seventeenth aspects, the IAB donor is the second IAB donor, and the other cell configuration is received by a CU of the second IAB donor on a second signaling connection.

In a nineteenth aspect, alone or in combination with one or more of the first through eighteenth aspects, the other cell configuration is received based at least in part on establishment of the second signaling connection.

In a twentieth aspect, alone or in combination with one or more of the first through nineteenth aspects, the cell configuration is based at least in part on a cell mapping associated with the other cell configuration.

In a twenty-first aspect, alone or in combination with one or more of the first through twentieth aspects, the cell configuration is based at least in part on changing a physical cell identifier included in the other cell configuration.

In a twenty-second aspect, alone or in combination with one or more of the first through twenty-first aspects, the cell configuration includes a physical cell identifier included in the other cell configuration.

In a twenty-third aspect, alone or in combination with one or more of the first through twenty-second aspects, the IAB donor is the first IAB donor, and the cell configuration is received based at least in part on establishment of a second signaling connection with the second IAB donor.

In a twenty-fourth aspect, alone or in combination with one or more of the first through twenty-third aspects, the IAB donor is the first IAB donor, and the cell configuration is received based at least in part on an addition, a deletion, or a change of a configuration of a cell associated with the second IAB donor.

In a twenty-fifth aspect, alone or in combination with one or more of the first through twenty-fourth aspects, the IAB donor is the first IAB donor, and the cell configuration is received based at least in part on based at least in part on a request provided from the CU of the first IAB donor.

In a twenty-sixth aspect, alone or in combination with one or more of the first through twenty-fifth aspects, the IAB donor is the first IAB donor, and the cell configuration is received based at least in part on a configuration provided by the CU of the first IAB donor.

In a twenty-seventh aspect, alone or in combination with one or more of the first through twenty-sixth aspects, the context transfer includes a handover.

In a twenty-eighth aspect, alone or in combination with one or more of the first through twenty-seventh aspects, the context transfer includes addition of the second IAB donor as a secondary node, the first IAB donor being a master node.

In a twenty-ninth aspect, alone or in combination with one or more of the first through twenty-eighth aspects, the context transfer includes changing a secondary node from the first IAB donor to the second IAB donor.

Aspect 1: A method of wireless communication performed by an integrated access and backhaul (IAB) node, comprising: determining a cell configuration of a distributed unit (DU) of the IAB node, the cell configuration being associated with a second IAB donor, wherein the DU is one of a set of DUs of the IAB node, and wherein the IAB node has a first signaling connection to a central unit (CU) of a first IAB donor; and providing the cell configuration associated with the second IAB donor.

Aspect 2: The method of Aspect 1, wherein the first signaling connection is a connection over an F1 interface.

Aspect 3: The method of Aspect 1, wherein the first signaling connection is a radio resource control connection.

Aspect 4: The method of any of Aspects 1-3, wherein the cell configuration is determined based at least in part on the cell configuration being received from a CU of the second IAB donor on a second signaling connection, the cell configuration being received by the DU or by another DU of the set of DUs.

Aspect 5: The method of Aspect 4, wherein the second signaling connection is a connection over an F1 interface.

Aspect 6: The method of Aspect 4, wherein the second signaling connection is a radio resource control connection.

Aspect 7: The method of any of Aspects 4-6, wherein the cell configuration is received from the CU of the second IAB donor based at least in part on a request provided to the CU of the second IAB donor on the second signaling connection.

Aspect 8: The method of any of Aspects 1-3, wherein the cell configuration is determined based at least in part on the cell configuration being received from the CU of the first IAB donor, the cell configuration being received by the DU or by another DU of the set of DUs.

Aspect 9: The method of Aspect 8, wherein the cell configuration is received from the CU of the first IAB donor based at least in part on a request provided to the CU of the first IAB donor on the first signaling connection.

Aspect 10: The method of any of Aspects 1-3, wherein the cell configuration is determined based at least in part on the cell configuration being configured on the IAB node by a network operator.

Aspect 11: The method of any of Aspects 1-10, wherein the cell configuration is associated with one or more cells served by the DU.

Aspect 12: The method of any of Aspects 1-11, wherein the cell configuration is associated with one or more cells activated by the second IAB donor on the DU.

Aspect 13: The method of any of Aspects 1-12, wherein the cell configuration includes a cell global identity that includes an identifier of the second IAB donor.

Aspect 14: The method of any of Aspects 1-13, wherein the cell configuration includes a physical cell identifier associated with a cell served by the DU or activated on the DU.

Aspect 15: The method of any of Aspects 1-14, wherein the cell configuration includes mapping information associated with mapping a cell global identity or a physical cell identifier to a cell associated with the first IAB donor and served by a particular DU of the IAB node, the particular DU being the DU or another DU of the set of DUs.

Aspect 16: The method of any of Aspects 1-15, wherein the cell configuration includes mapping information associated with mapping a cell global identity or a physical cell identifier to a cell associated with the first IAB donor and activated by the CU of the first IAB donor on a particular DU of the IAB node, the particular DU being the DU or another DU of the set of DUs.

Aspect 17: The method of any of Aspects 1-16, wherein the cell configuration includes activation status information associated with one or more cells served by the DU.

Aspect 18: The method of any of Aspects 1-17, wherein the cell configuration includes cell information associated with a cell served by or activated on the DU, the cell information associated with the cell including at least one of: a public land mobile network identifier, an area code associated with the cell, a frequency associated with the cell, a bandwidth associated with the cell, a direction associated with the cell, a size associated with the cell, a mode associated with the cell, a time-division duplexing configuration associated with the cell, a measurement timing configuration associated with the cell, access information associated with the cell, or connectivity support information associated with the cell.

Aspect 19: The method of any of Aspects 1-18, wherein the cell configuration is based at least in part on another cell configuration associated with the first IAB donor and is determined based at least in part on the cell configuration being received from a CU of the second IAB donor.

Aspect 20: The method of Aspect 19, wherein the other cell configuration is received from the CU of the first IAB donor on the first signaling connection.

Aspect 21: The method of any of Aspects 19-20, wherein the other cell configuration is provided to the CU of the second IAB donor.

Aspect 22: The method of Aspect 21, wherein the other cell configuration is provided based at least in part on establishment of a second signaling connection with the second IAB donor.

Aspect 23: The method of any of Aspects 19-22, wherein the cell configuration is based at least in part on a cell mapping of cell global identities or physical cell identifiers associated with the other cell configuration.

Aspect 24: The method of any of Aspects 19-23, wherein the cell configuration is based at least in part on changing a physical cell identifier included in the other cell configuration.

Aspect 25: The method of any of Aspects 19-24, wherein the cell configuration includes a physical cell identifier included in the other cell configuration.

Aspect 26: The method of any of Aspects 1-25, wherein the cell configuration is provided to the CU of the first IAB donor on the first signaling connection.

Aspect 27: The method of Aspect 26, wherein the cell configuration is provided based at least in part on establishment of a second signaling connection with the second IAB donor.

Aspect 28: The method of any of Aspects 26-27, wherein the cell configuration is provided based at least in part on an addition, a deletion, or a change of a configuration of a cell associated with the second IAB donor.

Aspect 29: The method of any of Aspects 26-28, wherein the cell configuration is provided based at least in part on a request received from the CU of the first IAB donor.

Aspect 30: The method of any of Aspects 26-29, wherein the cell configuration is provided based at least in part on a configuration provided by the CU of the first IAB donor.

Aspect 31: The method of any of Aspects 1-30, wherein the cell configuration is provided to a CU of the second IAB donor on a second signaling connection.

Aspect 32: The method of any of Aspects 1-31, wherein the cell configuration is to be used in association with a context transfer, associated with a child of the IAB node, from the first IAB donor to the second IAB donor based at least in part on the cell configuration.

Aspect 33: The method of Aspect 32, wherein the context transfer includes a handover.

Aspect 34: The method of any of Aspects 32-33, wherein the context transfer includes addition of the second IAB donor as a secondary node, the first IAB donor being a master node.

Aspect 35: The method of any of Aspects 32-34, wherein the context transfer includes changing a secondary node from the first IAB donor to the second IAB donor.

Aspect 36: A method of wireless communication performed by an integrated access and backhaul (IAB) donor, comprising: receiving a cell configuration of a distributed unit (DU) of an IAB node, the cell configuration being associated with a second IAB donor, wherein the DU is one of a set of DUs of the IAB node, and wherein the IAB node has a first signaling connection to a central unit (CU) of a first IAB donor; and performing one or more operations associated with a context transfer, associated with a child of the IAB node, from the first IAB donor to the second IAB donor based at least in part on the cell configuration.

Aspect 37: The method of Aspect 36, wherein the IAB donor is the first IAB donor, and the cell configuration is received on the first signaling connection.

Aspect 38: The method of any of Aspects 36-37, wherein the first signaling connection is a connection over an F1 interface.

Aspect 39: The method of any of Aspects 36-37, wherein the first signaling connection is a radio resource control connection.

Aspect 40: The method of any of Aspects 36-39, wherein the IAB donor is the second IAB donor, and the cell configuration is received on a second signaling connection.

Aspect 41: The method of Aspect 40, wherein the second signaling connection is a connection over an F1 interface.

Aspect 42: The method of Aspect 40, wherein the second signaling connection is a radio resource control connection.

Aspect 43: The method of any of Aspects 36-42, wherein the cell configuration is received from the DU or from another DU of the set of DUs.

Aspect 44: The method of any of Aspects 36-43, wherein the cell configuration is associated with one or more cells served by the DU.

Aspect 45: The method of any of Aspects 36-44, wherein the cell configuration is associated with one or more cells activated by the second IAB donor on the DU.

Aspect 46: The method of any of Aspects 36-45, wherein the cell configuration includes a cell global identity that includes an identifier of the second IAB donor.

Aspect 47: The method of any of Aspects 36-46, wherein the cell configuration includes a physical cell identifier associated with a cell served by the DU or activated on the DU.

Aspect 48: The method of any of Aspects 36-47, wherein the cell configuration includes mapping information associated with mapping a cell global identity or a physical cell identifier to a cell associated with the first IAB donor and served by a particular DU of the IAB node, the particular DU being the DU or another DU of the set of DUs.

Aspect 49: The method of any of Aspects 36-48, wherein the cell configuration includes mapping information associated with mapping a cell global identity or a physical cell identifier to a cell associated with the first IAB donor and activated by the CU of the first IAB donor on a particular DU of the IAB node, the particular DU being the DU or another DU of the set of DUs.

Aspect 50: The method of any of Aspects 36-49, wherein the cell configuration includes activation status information associated with one or more cells served by the DU.

Aspect 51: The method of any of Aspects 36-50, wherein the cell configuration includes cell information associated with a cell served by or activated on the DU, the cell information associated with the cell including at least one of: a public land mobile network identifier, an area code associated with the cell, a frequency associated with the cell, a bandwidth associated with the cell, a direction associated with the cell, a size associated with the cell, a mode associated with the cell, a time-division duplexing configuration associated with the cell, a measurement timing configuration associated with the cell, access information associated with the cell, or connectivity support information associated with the cell.

Aspect 52: The method of any of Aspects 36-51, wherein the cell configuration is based at least in part on another cell configuration associated with the first IAB donor.

Aspect 53: The method of Aspect 52, wherein the IAB donor is the first IAB donor, and the other cell configuration is provided by the CU of the first IAB donor on the first signaling connection.

Aspect 54: The method of Aspect 52, wherein the IAB donor is the second IAB donor, and the other cell configuration is received by a CU of the second IAB donor on a second signaling connection.

Aspect 55: The method of Aspect 54, wherein the other cell configuration is received based at least in part on establishment of the second signaling connection.

Aspect 56: The method of any of Aspects 52-55, wherein the cell configuration is based at least in part on a cell mapping of cell global identities or physical cell identifiers associated with the other cell configuration.

Aspect 57: The method of any of Aspects 52-56, wherein the cell configuration is based at least in part on changing a physical cell identifier included in the other cell configuration.

Aspect 58: The method of any of Aspects 52-57, wherein the cell configuration includes a physical cell identifier included in the other cell configuration.

Aspect 59: The method of any of Aspects 36-58, wherein the IAB donor is the first IAB donor, and the cell configuration is received based at least in part on establishment of a second signaling connection with the second IAB donor.

Aspect 60: The method of Aspect any of Aspects 36-59, wherein the IAB donor is the first IAB donor, and the cell configuration is received based at least in part on an addition, a deletion, or a change of a configuration of a cell associated with the second IAB donor.

Aspect 61: The method of any of Aspects 36-60, wherein the IAB donor is the first IAB donor, and the cell configuration is received based at least in part on based at least in part on a request provided from the CU of the first IAB donor.

Aspect 62: The method of any of Aspects 36-61, wherein the IAB donor is the first IAB donor, and the cell configuration is received based at least in part on a configuration provided by the CU of the first IAB donor.

Aspect 63: The method of any of Aspects 36-62, wherein the context transfer includes a handover.

Aspect 64: The method of any of Aspects 36-63, wherein the context transfer includes addition of the second IAB donor as a secondary node, the first IAB donor being a master node.

Aspect 65: The method of any of Aspects 36-64, wherein the context transfer includes changing a secondary node from the first IAB donor to the second IAB donor.