The present disclosure relates to a communication method and system for converging a 5.sup.th-Generation (5G) communication system for supporting higher data rates beyond a 4.sup.th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. Embodiments herein provide a method for authentication by dynamically generating security credentials in plug and play scenarios without a pre-configuration of F1 security credentials at an integrated access and backhaul (IAB) relay device in a wireless network. The method includes generating, by the IAB relay device, a stratum security key for one of an access stratums (AS) security establishment and a non-access stratums (NAS) security establishment with an IAB donor device in the wireless network. Further, the method includes generating, by the IAB relay device, a pre-shared key (PSK) based on the stratum security key. Further, the method includes generating an Internet Key Exchange (IKE) value using the PSK for establishing an F1 interface security with the IAB donor device.

Various aspects of the present disclosure generally relate to roadside unit relay for sidelink communications. In some aspects, a user equipment (UE) may determine a resource in which to monitor for a message from a wireless communication device, where the message is based at least in part on information from one or more vehicle to everything (V2X) messages received by the wireless communication device. The UE may monitor for the message only in the resource and receive the message in the resource. Numerous other aspects are provided.

This application discloses a communication method and a communication apparatus. The communication method includes: An IAB node receives first configuration information from a source donor base station, where the first configuration information includes N pieces of configuration information of an MT and N pieces of configuration information of a DU that are configured by N target donor base stations for the IAB node; and the DU of the IAB node uses one piece of configuration information in the N pieces of configuration information of the DU when the MT of the IAB node satisfies a specific condition, where N is greater than or equal to 1, the MT is configured to communicate with a parent node of the IAB node, the source donor base station, or the target donor base station, and the DU is configured to communicate with a child node of the IAB node or a terminal.

A communication control method includes, by a relay node relaying communication between a lower node and an upper node, detecting a failure in a first radio link between the upper node and the relay node, by the relay node, in response to the detection of the failure, transmitting, to the lower node, a first notification indicating the detection of the failure and attempting recovery of the first radio link, and, by the lower node, executing predetermined processing in a state of maintaining a second radio link with the relay node until a predetermined time period elapses after reception of the first notification from the relay node.

A relay control method according to the first aspect is a method used in a mobile communication system in which one or a plurality of relay nodes relay data from user equipment to a base station. The relay control method includes: predicting, by a first lower node, an estimate transmission data amount being an estimate amount of data to be transmitted within a certain period from the first lower node to a first upper node being an upper node of the first lower node; and transmitting, by the first lower node, data amount information indicating the estimate transmission data amount to the first upper node.

A communication control method is a method using a relay node that includes a first functional unit connecting wirelessly to a lower node and a second functional unit connecting wirelessly to the upper node and relays data from the lower node to the upper node. The communication control method includes detecting, by the second functional unit, that a predetermined event related to resource allocation to the lower node is occurred in the first functional unit, and transmitting, by the second functional unit, to the upper node, in a case of detecting occurrence of the predetermined event, a first buffer state report including size information indicating an amount of data having yet to be transmitted to the upper node. The detecting includes detecting the occurrence of the predetermined event by monitoring an event occurring in the first functional unit, or by receiving, from the first functional unit, a notification indicating that the predetermined event is occurred.

Embodiments include methods, performed by first node in an integrated access backhaul (IAB) network, for scheduling uplink (UL) transmissions in the IAB network. Such methods include receiving, from a first downstream node in the IAB network, a first buffer status report (BSR) indicating a first amount of UL data, with the first amount including UL data buffered at the first downstream node, and/or UL data expected to be received by the first downstream node. Such methods also include sending, to the first downstream node, a first UL resource grant indicating a time schedule of resources available for the first downstream node to transmit at least a portion of the first amount of UL data. In some embodiments, the first UL resource grant is sent after receiving the first BSR and without receiving a second UL resource grant from an upstream node in response to a second BSR.

Provided are an information transmission method and device. The method comprises: an IAB node sends an F1 message to a base station, and forwards the F1 message to an IAB donor via the base station. In the present disclosure, the problem of lacking an IAB control plane information transmission scheme applicable to the NR is solved, and the forwarding of control plane information between an IAB node and an IAB donor is realized timely and accurately.

Aspects described herein relate to determining, by a node, to establish a first backhaul connection with a first upstream node for access link communications with a first downstream node, determining, by the node, to establish a second backhaul connection with a second upstream node for access link communications with a second downstream node, establishing the first backhaul connection with the first upstream node based on a first transmit/receive beam pair, and establishing the second backhaul connection with the second upstream node based on a second transmit/receive beam pair and while the first backhaul connection is established with the first upstream node.

Mapping Information for Integrated Access and BackhaulEmbodiments described herein relate to methods and apparatus for providing IAB mapping information. A method performed by CU-CP of a base station configured as a donor base station for one or more IAB nodes comprises transmitting a first message to setup or modify a first bearer context for a first bearer in a central unit user plane, CU-UP, of the base station, wherein the first message comprises an information element indicating mapping information for use in determining a mapping of the first bearer to a backhaul radio link control, BH RLC, channel.