Fallback aspects associated with the power ramping procedure are addressed. More specifically, a set of control mechanisms allows for a gNB to adjust thresholds for controlling the UE transfer from a 2-step RACH procedure to a 4-step RACH procedure while still maintaining a proper setting for transmit power during this transition. The mechanism will allow for a UE to have a smooth transition to the 4-step procedure instead of having to start the power ramping from scratch when transferring to the fall-back routine.

Fallback aspects associated with the power ramping procedure are addressed. More specifically, a set of control mechanisms allows for a gNB to adjust thresholds for controlling the UE transfer from a 2-step RACH procedure to a 4-step RACH procedure while still maintaining a proper setting for transmit power during this transition. The mechanism will allow for a UE to have a smooth transition to the 4-step procedure instead of having to start the power ramping from scratch when transferring to the fall-back routine.

A method for handling a Message A physical uplink shared channel (PUSCH) transmission in a random access channel (RACH) procedure for use in fifth generation new radio (5G NR) wireless communication system includes determining that the Message A PUSCH transmission in a first step of a two-step RACH procedure overlaps with at least one other uplink physical channel transmission and transmitting at least one of the Message A PUSCH transmission or the at least one other uplink physical channel transmission in accordance with a priority rule.

A wireless device receives a system information block (SIB) comprising a value of a scheduling request (SR) delay timer. The wireless device receives, in a radio resource control (RRC) connected state, an RRC message comprising a parameter indicating the SR delay timer is applied to a logical channel. The wireless device initiates a small data transmission (SDT) procedure in an RRC inactive state, wherein at least one radio bearer, associated with the logical channel, is configured for the SDT procedure. The wireless device, in response to triggering, during the SDT procedure, buffer status reporting (BSR) for the logical channel, start the SR delay timer based on the parameter indicating the SR delay timer is applied to the logical channel and the value of the SIB.

Methods, apparatuses and computer program provide for random access in a wireless communication system. A method implemented in a network device comprises receiving, from a terminal device, a signal for initiating an RA procedure of a first RA type, the signal including a preamble portion and an information portion. In response to successfully detecting the preamble portion of the signal, but failure in detection of the information portion of the signal, transmitting to the terminal device a first response indicating a successful detection of only a preamble portion of the signal, or a second response indicating an RA procedure of a second RA type different from the first RA type. The described technique may increase the reliability of a two-step RACH procedure and/or reduce consumption of time-frequency resources.

The disclosure relates to a method for connection establishment, a terminal device, and a network device. The method includes the following. A terminal device transmits a first sequence to a network device during connection establishment with the network device. The first sequence indicates first identification information, and the first identification information is used to identify the terminal device.

The disclosure relates to a method for connection establishment, a terminal device, and a network device. The method includes the following. A terminal device transmits a first sequence to a network device during connection establishment with the network device. The first sequence indicates first identification information, and the first identification information is used to identify the terminal device.

Embodiments of the present application relate to a method and apparatus for timing advance (TA) compensation. An exemplary method includes: receiving configuration information indicating a reference power; estimating a first TA between the UE and a first BS based on the reference power, and compensating a TA based on the estimated first TA when initiating a random assess procedure to the first BS. Embodiments of the present application can efficiently compensate the TA in scenarios (e.g., NTN) with large propagation delay.

Embodiments of the present application relate to a method and apparatus for timing advance (TA) compensation. An exemplary method includes: receiving configuration information indicating a reference power; estimating a first TA between the UE and a first BS based on the reference power, and compensating a TA based on the estimated first TA when initiating a random assess procedure to the first BS. Embodiments of the present application can efficiently compensate the TA in scenarios (e.g., NTN) with large propagation delay.

A communication apparatus having at least one of a plurality of features defined in a mobile communication system, the communication apparatus comprising: a receiver configured to receive, from a base station, a system information block including information indicating a plurality of resources of random access and information indicating correspondence between each of the plurality of resources of the random access and a combination of one or more features; and a controller configured to select, from the plurality of resources of the random access, a resource of the random access corresponding to the at least one of the plurality of features which the communication apparatus has, on a basis of the information indicating the correspondence, and to calculate a random access-radio network temporary identifier (RA-RNTI) used in a random access procedure on a basis of the selected resource of the random access. The one or more features includes at least one of a reduced capability (RedCap) feature, a small data feature, a network slicing feature, and a feature for repetition of a message3 (MSG3).