Joint user activity detection and channel information estimation in extra-large MIMO (XL-MIMO) systems with non-stationarities proceeds by: receiving signals and initialization of a channel estimation; performing soft interference cancel check, whereby, if the soft interference cancel check result is negative, the calculation of residual mean and variance is performed; whereby, if the soft interference cancel check result is positive, the extrinsic mean and variance is calculated directly; whereby, if the soft interference cancel check result is negative, the calculation of residual mean and variance is used, whereby the calculation of tentative estimation includes activity factors calculation; if reaching the maximum is not fulfilled, soft interference cancel check is performed; whereby, if reaching the maximum is fulfilled, the proceeding ends.

Joint user activity detection and channel information estimation in extra-large MIMO (XL-MIMO) systems with non-stationarities proceeds by: receiving signals and initialization of a channel estimation; performing soft interference cancel check, whereby, if the soft interference cancel check result is negative, the calculation of residual mean and variance is performed; whereby, if the soft interference cancel check result is positive, the extrinsic mean and variance is calculated directly; whereby, if the soft interference cancel check result is negative, the calculation of residual mean and variance is used, whereby the calculation of tentative estimation includes activity factors calculation; if reaching the maximum is not fulfilled, soft interference cancel check is performed; whereby, if reaching the maximum is fulfilled, the proceeding ends.

A user equipment (UE) receives a timing advance medium access control (MAC) control element. The UE applies a timing advance command of the timing advance MAC control element and to start or restart a time alignment timer. The UE releases physical uplink control channel (PUCCH) resources and releases any assignment sounding reference signal (SRS) resources, when the time alignment timer expires. The UE flushes hybrid automatic request (HARQ) buffers, when the time alignment timer expires or is stopped.

A method of transmitting and receiving a signal for a random access channel (RACH) procedure by a user equipment (UE) in a wireless communication system is disclosed. The method includes transmitting a message A including a physical random access channel (PRACH) and a physical uplink shared channel (PUSCH), and receiving a message B related to contention resolution in response to the message A. Transmission power for a retransmission of the message A is configured based on that a counter value related to the transmission power is incremented or maintained, the counter value is maintained based on that a transmission spatial filter related to the PRACH is changed for the retransmission of the message A, and the counter value is used for configuring the transmission power based on that the PRACH and the PUSCH are transmitted via the message A.

The present application is at least directed to an apparatus in a network including a non-transitory memory including instructions stored thereon for obtaining a resource for accessing a target cell in the network. The apparatus includes a processor, operably coupled to the non-transitory memory, configured to execute the instructions of detecting plural beams associated with the target cell. The processor also executes the instructions of determining one or more of the plural detected beams meeting a threshold for performing random access. The processor also executes the instructions of evaluating if a physical random access channel (PRACH) resource is associated with the one or more determined beams meeting the threshold. The processor further executes the instructions of selecting one of the evaluated beams exhibiting a reference signal received power (RSRP) above a predetermined value. The processor even further executes the instructions of picking the PRACH resource associated with the selected beam.

Methods, systems, and devices for wireless communication are described. In some wireless systems, a base station may configure a user equipment (UE) for random access (RACH) message transmission in dedicated RACH resources during, for example, a handover process. The contention-free random access (CFRA) resources may allow the UE to transmit RACH messages at a higher transmission power than contention-based random access (CBRA) resources. The base station may indicate, to the UE, RACH transmission parameters for CFRA that are different than parameters for CBRA. These parameters may include configuration information, frequency division multiplexing information, RACH retransmission parameters, target received power, response window length, etc. The UE may use the indicated RACH transmission parameters to transmit a RACH message to the base station. The base station may respond with a RACH response message, and the base station and UE may synchronize upon completion of the RACH procedure.

The present disclosure relates to a user equipment comprising a receiver receiving a minimum-system-information message from a first radio base station. System information for the first radio cell that can be acquired by the UE is carried within the minimum-SI message and one or more additional-SI messages. The minimum-SI message includes system information for accessing the first radio cell and at least one system information index, each of which is associated with one of the additional-SI messages. The SI message index comprises a value tag and an area pointer, the latter pointing to one area already defined. Processing circuitry determines whether the UE had already acquired before the additional-SI message associated with the same value tag and the same area. If the determination is positive, the processing circuitry determines that system information included in said additional-SI message acquired before is applicable to the first radio cell.

Embodiments of this application provide a method and an apparatus for reporting location information. The method includes a terminal device determines that a trigger condition of a first procedure is satisfied. The first procedure is for determining a location area of the terminal device, and the trigger condition includes at least one of The terminal device switches the location area, a quantity of times that the terminal device switches the location area exceeds a first preset value; the terminal device has displacement, and the displacement exceeds a second preset value, a time interval since the last time the terminal device triggers the first procedure exceeds first time, or, the terminal device enters an idle state or an inactive state. The terminal device triggers the first procedure.

The present invention relates to a wireless communication system. The present invention relates more particularly to a method and an apparatus for receiving a downlink signal by a device in a wireless communication system, the method comprising the steps of: receiving from a subframe a first PDCCH comprising scheduling information about first common data; receiving from the subframe a second PDCCH comprising scheduling information about second common data; and, on the basis of Ta, a TB size of the first common data and Tb, a TB size of the second common data, controlling a procedure for receiving downlink data from the subframe, wherein if T1<Ta<=T2 and T1<Tb<=T2, performed is a procedure for processing reception signal with respect to the first common data or the second common data.

Disclosed is a method for use in a first node in a wireless access communication system. According to the method, the first node controls traffic to and from users, UEs, within a certain area in the system, a cell, and the first node is equipped with a plurality of transmit antennas. The first node can employ a variety of multi antenna transmit modes for down link transmissions, i.e. transmissions to the UEs, and the first node can carry out a so called Random Access (RA) procedure with UEs which do not have a dedicated up link resource, i.e. a resource to the eNodeB. According to the method, one and the same down link multi antenna transmit mode is used by the first node during the RA procedure.