The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. According to an embodiment, the method comprises initiating a small data transmission (SDT) procedure, in a radio resource control (RRC) inactive state, obtaining a report for a log connection failure or an SDT procedure failure, based on an expiry of an SDT timer, wherein the report for the log connection failure includes information indicating that the report is for SDT and in case that the UE enters an RRC connected state, and transmitting the report to a base station, based on a request for the report from the base station.

Non-Orthogonal Multiple Access (NOMA) transmissions are described herein in which sequence collision is mitigated or eliminated by exploiting the randomness nature of user specific reference bits and data bits. Further, methods, systems, and devices that use NOMA for small data transmissions are disclosed.

A fifth generation (5G) or sixth generation (6G) communication system for supporting a higher data transmission rate is provided. A method performed by a terminal configured with a carrier aggregation (CA) for a first cell and a second cell is provided. The method includes determining a beam failure of the first cell, in response to the determining of the beam failure of the first cell, transmitting a first message of a random access for a beam failure recovery, receiving a second message of the random access on a physical downlink shared channel (PDSCH) of the first cell based on the transmission of the first message, transmitting a third message of the random access based on the second message and receiving a fourth message of the random access on the PDSCH of the first cell based on the transmission of the third message, wherein control information is received on a PDCCH.

A method for UE capability signaling to support NR-U is proposed. A UE transfers UE capability information to a mobile communication network, and the UE capability information includes information regarding whether the UE supports system information acquisition on an unlicensed cell. The UE receives configuration from a serving cell of the mobile communication network, and the configuration includes information for system information acquisition of one or more unlicensed cells on a frequency. The UE acquires system information of the one or more unlicensed cells on the frequency and reports the acquired system information to the serving cell, or stores the acquired system information in the UE.

Systems, methods and instrumentalities are described herein with respect to the mobility and multi-connectivity of wireless transmit receive units. These devices may be configured to perform conditional handovers and/or conditional second cell group reconfigurations including primary secondary cell additions or changes. The devices may exchange information with a network while performing the conditional reconfigurations and/or conditional handovers. The devices may be configured with rules to handle concurrent handover and reconfiguration tasks.

Random access preamble detection for propagation delay is described herein. The proposed solution predicts energy levels for a set of hypotheses, compares the predicted energy with measured energy, and selects the hypothesis that minimizes a cost function based on the difference of the predicted energy and the measured energy. Some embodiments of the proposed solution may make it possible to extend cell range by allowing a maximum round-trip time exceeding the period of the random access preamble sequence. For the long preamble formats for Long Term Evolution (LTE) and New Radio (NR), the cell range may be extended beyond 120 kilometers (km). For millimeter wave applications, the cell range may be extended beyond 2.5 km.

A random access method and apparatus and a communication system. The apparatus includes a first processor circuit, the first processor circuit being configured to: receive resource configuration of contention-free random access, the resource configuration of contention-free random access comprising resource configuration of second type contention-free random access (CFRA); and perform a second type contention-free random access procedure according to the resource configuration of the second type CFRA, wherein the resource configuration of the second type CFRA comprises a second type CFRA preamble index associated with a synchronization signal block (SSB) or a channel state information reference signal (CSI-RS), configuration of a physical random access channel occasion (RO) of a second message (MsgA), and configuration of a physical uplink shared channel (PUSCH) of the MsgA.

A communication method, a device, and a system, the method including sending, by a terminal device that supports a first user identity and a second user identity, first information to a first access network device using the first user identity, the first access network device being an access network device to which a first cell belongs, where the first cell is a primary cell in which the terminal device communicates with the first access network device by using the first user identity, where the second cell is a cell on which the terminal device camps using the second user identity, and the first indication information indicates that the first user identity and the second user identity that are supported by the terminal device share capabilities of the terminal device, and receiving first configuration information from the first access network device using the first user identity.

An electronic device may transmit a communication request to a base station having an indication of a number of its receive branches and an indication of whether the communication request is designated as an urgent service fulfillment. The base station may delay a denial of the communication request until receiving the indication of whether the communication request is designated as using the urgent service fulfillment to reduce a likelihood of prematurely rejecting the communication request. The base station may also handover the communication request to a base station that supports the urgent service fulfillment. The base station may also be barred from transferring the user equipment to a frequency layer preferred by the base station when the communication request of the user equipment is designated as an urgent service fulfillment.

Embodiments herein provide a method and system for managing Grant-free data transmission in a radio communication network. The proposed method includes composing, by a Base Station (BS), a Select Signal (SS) for a transceiver device, where the SS is configured to control a grant-free data transmission from the transceiver device. Further, the proposed method includes transmitting, by the BS, the SS to the transceiver device. Further, the proposed method includes receiving, by a transceiver device, the SS from the BS. Further, the proposed method includes decoding, by the transceiver device, the SS and furthermore, the proposed method includes controlling, by the transceiver device, a data transmission by one of activating the grant-free data transmission from the transceiver device in response to successful decoding of the SS, and deactivating the grant-free data transmission from the transceiver device in response to unsuccessful decoding of the SS.