A terminal device is operative to receive a broadcast message (91) from a cellular network, the broadcast message (91) including at least one bit associated with coverage enhancement, CE, operation of the terminal device. The terminal device is operative to control, when the terminal device is in CE operation, a radio interface to selectively delay, based on the at least one bit included in the broadcast message (91), a CE level dependent repetition of a random access preamble transmission (93, 94).

In a wireless communications system comprising a user device and a base station, the base station periodically broadcasts system information which is used by the user device in a random access procedure to connect to the base station. The base station grants uplink resource to the user device for sending a connection request message. In response to the connection request message, the base station transmits a contention resolution message, which the user device must acknowledge. The system information periodically broadcast by the base station comprises an acknowledgement control marker defining whether the acknowledgement is to be sent on a reserved uplink control channel using second uplink resource or via first uplink resource allocated to the user device in the uplink grant for the connection request message.

Embodiments disclosed herein provide favored channel access for STAs whose transmissions have failed or collided. After a first collision or transmission failure, a STA receives prioritized access in order to re-transmit a PPDU. If an initial transmission of the PPDU is unsuccessful (e.g., the initial transmission fails or if the PPDU collides with another transmission), for retransmission of the PPDU, the STA may update the EDCA parameters to EDCA parameters for prioritized access, may determine a backoff for accessing the wireless medium, and may retransmit the PPDU based on the EDCA parameters for prioritized access (i.e., using the updated EDCA parameters). The EDCA parameters for prioritized access may be configured to give the STA a higher probability of accessing the wireless medium for a PPDU retransmission than use of the initial EDCA parameters.

Disclosed in the present application are a method and apparatus for reporting a random access procedure. The method includes: receiving a first message sent by a network device, the first message being used to indicate the terminal device to report a random access parameter list to the network device, and the random access parameter list including a two-step random access parameter list and/or a four-step random access parameter list; and reporting the random access parameter list to the network device according to the first message.

Disclosed is a method for long term evolution (LTE) carrier determination by a new radio user equipment (NR UE), including determining whether an LTE carrier includes unused resources for data transmission, in response to determining the LTE carrier includes the unused resources, performing a collision determination, the collision determination being based at least in part on a randomized likelihood that transmissions of the NR UE on the LTE carrier will collide with transmission of one or more other NR UEs on the LTE carrier, and based on the collision determination, performing a transmission delay, the transmission delay occurring during a random back off period duration.

Methods and apparatuses are provided through which a first node transmits, to a second node, a first message include a radio resource control (RRC) message associated with a terminal and an identifier allocated to the terminal to identify the terminal over an interface. The first node receives, from the second node, a second message including an identifier allocated to the terminal, an identifier of a data radio bearer, and uplink tunnel information. The first node transmits, to the second node, a third message including downlink tunnel information. The first node includes a radio link control (RLC) layer, a medium access control (MAC) layer, and a physical (PHY) layer. The second node includes an RRC layer and a packet data convergence protocol (PDCP) layer.

For collision handling between shortened Transmission Time Interval (sTTI) and Transmission Time Interval (TTI) transmissions, a method determines a collision between user equipment (UE) uplink transmission resources in a first TTI 16 of a first TTI length and uplink transmission resources in a second TTI 16 of a second TTI length. The method further transmits a first uplink data transmission block (TB) in the first TTI and a second uplink data TB in the second TTI. The method interrupts the transmission of the first uplink data TB before transmission of the second uplink data TB. The method receives an indication that indicates whether to resume transmission of the first uplink data TB. The method determines to resume the transmission of the first uplink TB based on the indication.

The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). A method of determining a frequency-domain offset parameter of a preamble in a random access channel and a corresponding user equipment (UE) is provided. The method includes obtaining a random access channel subcarrier spacing Δf.sub.RA, a preamble length L.sub.RA and a uplink (UL) channel subcarrier spacing Δf from a base station and determining a frequency-domain offset parameter k of a preamble in a random access channel based on the obtained random access channel subcarrier spacing Δf.sub.RA, preamble length L.sub.RA and UL channel subcarrier spacing Δf. Other embodiments of the disclosure further provide a random access method, a method for configuring random access information and related device, and a corresponding computer readable medium.

The present disclosure provides a user equipment for a mobile telecommunications system, which includes circuitry configured to communicate with a new radio base station. The circuitry is further configured to transmit an on-demand system information request to the new radio base station, wherein the on-demand system information request is transmitted based on a backup resource.

Aspects of the present disclosure relate to wireless communications, and more particularly, to techniques for signaling a new data indicator (NDI) and/or redundancy version (RV) for physical uplink/downlink shared channel (PxSCH) transmissions scheduled by a multi-PxSCH downlink control information (DCI) grant. In some cases, these techniques may be used even when a scheduled PxSCH transmission is invalid. In some cases, a number of bits in an NDI field of the DCI corresponds to a number of PxSCHs scheduled by the multi-PxSCH DCI grant. In some cases, a number of bits in an RV field of the DCI corresponds the number of PxSCHs scheduled by the multi-PxSCH DCI grant.