A method of handling random access for a user equipment of a wireless communication system includes transmitting a plurality of repetitions of a random access preamble to a network of the wireless communication system; and monitoring a physical downlink control channel (PDCCH) in a plurality of random access response windows for receiving a random access response identified by a random access radio network temporary identifier (RA-RNTI) from the network, wherein each of the plurality of random access response windows is corresponding to one of the plurality of repetitions of the random access preamble.

In an embodiment, a UE selects between RS collision protocols to selectively monitor, on downlink resource(s) scheduled with overlapping transmissions of first and second RS types, either the first RS type or neither RS type. In another embodiment, a base station determines that a downlink resource(s) are scheduled with overlapping transmissions of first and second RS types, punctures the second RS type, and selectively transmits the first RS type on the overlapped downlink resource(s). In another embodiment, a base station establishes non-overlapping NPRS and eNPRS transmission schedules.

Methods, systems, and devices for wireless communication are described. The method may include transmitting a first synchronization signal in a set of beam directions during a first symbol period of a synchronization subframe and transmitting a second synchronization signal in another set of beam directions during a second symbol period of the synchronization subframe. The second set of beam directions may be spatially interleaved with the first set of beam directions. Additionally, the method may include monitoring a first and second set of beam directions during a first and second symbol period of a random access subframe, respectively. Additionally, the method may include receiving, from a base station, first and second synchronization signals in a synchronization subframe, decoding the first synchronization signal, and transmitting an access request based at least in part on the decoded first synchronization signal.

An example radio frequency (RF) communication system includes a plurality of RF nodes. The plurality of RF nodes includes a receiver RF node and a sender RF node. Each RF node includes a memory coupled to a processor along with delay assignment programming in the memory, which includes functions. The functions configure the sender RF node to transmit a data packet to the receiver RF node, and to transmit a delay report message. The functions configure the receiver RF node to receive the data packet and to receive the delay report message. The receiver RF node further assigns the RF node delay value of the receiver RF node to a value not in the delay report message. Then, the receiver RF node waits a delay period of time, wherein the delay period of time corresponds to the assigned value or a multiple thereof, and additionally broadcasts the data packet.

The disclosure provides methods and devices for confirming the resource configuration of uplink signal transmission. The method includes receiving a configuration indicating a physical random access channel (PRACH) transmission occasion (RO), determining resource set(s) corresponding to one or more PRACH ROs according to the configuration, and performing uplink transmission on the determined one or more resource sets.

The invention relates to a technique for performing a random access procedure over a radio interface, for example between a mobile terminal and a radio base station of a mobile network. A method aspect of the invention comprises the steps of transmitting a synchronization request for synchronization information; receiving synchronization information in response to the synchronization request; and transmitting, based on at least one transmission parameter adjusted in accordance with the synchronization information, a resource request for data transmission resources.

The disclosure relates to technology for identifying a user equipment beam index in a base station. The base station indicates one or more resources assigned to the user equipment within a beam failure random access channel (BRACH) resource, and transmits one or more synchronization signal block resources and one or more new beam identification reference signal resources to the user equipment. The base station then receives one of the resources from a group of the one or more resources within the BRACH resource assigned to the user equipment corresponding to the BRACH resource, and identifies a preferred beam index of the user equipment based on information in the BRACH resource and the received one of the resources.

A communication device (10, 100-1, 100-2, 100-3, 100-4) detects potentially colliding usage of transmission resources. Further, the communication device (10, 100-1, 100-2, 100-3, 100-4) detects cease of the potentially colliding usage of the transmission resources. After expiry of a backoff time period starting when detecting the cease of the usage of the transmission resources, the communication device (10, 100-1, 100-2, 100-3, 100-4) performs a transmission on the transmission resources. This transmission is performed synchronously with a further transmission on the transmission resources by at least one other communication device (10, 100-1, 100-2, 100-3, 100-4).

A method and apparatus for a wireless transmit receive unit (WTRU) to use a contention-based uplink communications channel, applies a rule-based restriction of access to the contention-based uplink channel that attempts to use at least one contention-free uplink channel allocation for uplink transmissions on a condition that at least one contention-free uplink channel allocation has been granted.

Synchronization signal block (SSB) multiplexing and remaining material system information (RMSI) monitoring in new radio unlicensed (NR-U) networks are disclosed. For SSB multiplexing, a user equipment (UE) receives an SSB configuration for a discovery signal detection window having a plurality of communication slots, wherein, based on the SSB configuration, UE identifies random access resource and time and frequency locations to monitor remaining minimum system information (RMSI) configured for each SSB. The UE further receives an SSB transmission indicator that reflects a listen before talk (LBT) result, which it may use with the SSB configuration to map one or more SSB for rate matching in selected slots. The UE can then rate match any data transmissions around the identified SSBs in those identified slots regardless of LBT result. The UE may further leverage the SSB configuration and indication of LBT result to monitor SSB transmissions for control resource set (CORESET) transmissions.