Embodiments of the present invention provide a base station, user equipment, and a measurement method for inter-base station carrier aggregation. The method includes: a primary base station of the UE sends a message include indication information to request the UE report a timing offset between the primary base station and a secondary base station of the UE; the secondary base station calculates a corrected measurement gap information according to a measurement gap information and the timing offset; the secondary base station stops scheduling the UE in a measurement gap period indicated by the corrected measurement gap information. In the embodiments of the present invention, the secondary base station does not schedule user equipment in a measurement gap period of the UE, which avoids waste of an air interface resource and improves the network transmission efficiency.

In accordance with a first aspect of the present disclosure, a method for determining the position of a node in a communication network is conceived, wherein said network comprises said node and a plurality of anchors, the method comprising: the node transmits a poll message to the plurality of anchors; a first anchor of said plurality transmits a response message to the node and to one or more other anchors of said plurality of anchors; a processing unit calculates the position of the node using timing information of the poll message transmission by the node, of the poll message reception by the plurality of anchors, of the response message transmission by the first anchor, and of the response message reception by the node and the other anchor or anchors. In accordance with other aspects of the present disclosure, a corresponding computer program and a corresponding system for determining the position of a node in a communication network is provided.

Methods, systems, and devices for wireless communications that support upstream timing control mechanisms for non-terrestrial networks are described. Generally, the described techniques provide for wireless communications from a user equipment (UE) in wireless communication with a satellite. A gateway in the non-terrestrial networks may receive an upstream transmission from the UE in wireless communication with the satellite and determine a timing adjustment for a second upstream transmission from the UE based on the upstream transmission from the UE. The gateway may then transmit to the UE in a group control information message or a dedicated physical channel message, a timing command indicating the timing adjustment for the second upstream transmission. The UE may receive the second timing adjustment and transmit data over the second upstream transmission using the second timing adjustment.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a first wireless node may receive, from a second wireless node, a round-trip time timing advance indicator, wherein the round-trip time timing advance indicator is different from a timing advance indicator used for an uplink transmission timing advance message. In some aspects, the first wireless node may synchronize a timing configuration of the first wireless node to at least one of the second wireless node or a third wireless node based at least in part on the round-trip time timing advance indicator. Numerous other aspects are provided.

The present invention is designed to establish synchronization between transmission points when downlink signals are transmitted from a plurality of transmission points to a user terminal. A radio communication system has a first radio base station that forms a first cell, a second radio base station that forms a second cell, which is placed on the area of the first cell in an overlapping manner, and a user terminal that is capable of carrying out radio communication with the first radio base station and the second radio base station, and the second radio base station has a receiving section that receives synchronization correction information, which is for establishing synchronization with a synchronization target, from the user terminal, and a synchronization correction section that corrects synchronization based on the synchronization correction information.

A system and method for cell synchronization suitable for a wireless signal including substantially identical synchronization signals that repeat in predetermined time intervals, the synchronization signals including a plurality of substantially identical symbols. For a plurality of candidate synchronization points: dividing the wireless signal into a plurality of signal segments, each equal or longer than the time interval, and each including a plurality of sub-segments having substantially same length as the symbol; performing symbol-length cross-correlations between an expected symbol and the sub-segments; performing segmented symbol-wise correlations between the cross-correlation results; calculating a cost function based on the results of the symbol-wise correlations; accumulating the cost functions across a plurality of signal segments; and selecting a coarse synchronization point from the plurality of candidate synchronization points based on the accumulated cost function; Estimating synchronization parameters e.g. time and frequency offset based on the selected synchronization point.

Systems and methods for positioning in a cellular communications system are disclosed. A method performed by a first base station (BS) includes receiving a signal transmitted by a second BS and estimating a Time of Arrival (TOA) of the received signal at the first BS according to a clock of the first BS. The method further includes determining a delta value that is or is a function of a time between the TOA of the received signal at the first BS according to the clock and a time reference at the first BS and either (a) providing the delta value to a positioning estimation entity within the communications system or (b) using the delta value at the first BS to reduce a time synchronization error between the first BS and the second BS, or (c) passing the delta value to a User Equipment.

Apparatuses and methods for monitoring network timing are disclosed. A method comprises storing (300) information on a reference propagation delay between the apparatus and one or more radio access nodes, controlling (302) reception of a reference signal from one or more radio access nodes, the reference signal comprising information on the transmission time instant of the signal, determining (304) the reception time instant of the reference signal, determining (306) the propagation delay of the reference signal based on the time difference of the reception time instant and the transmission time instant, and determining (308) correctness of time references of the apparatus and the one or more radio access nodes based on the determined and stored propagation delays.

Aspects relate to configuring a delay between a downlink control channel and a downlink/uplink. For example, the base station determines first search spaces indicating potential locations for a first downlink control channel and/or second search spaces indicating potential locations for a second downlink control channel. The base station configures and transmits first delays and/or second delays. Each first delay indicates a respective time delay between a resource location of the first downlink control channel and a resource location of a downlink data associated with the first downlink control channel and is configured for a respective first search space of the first search spaces. Each second delay indicates a respective time delay between a resource location of the second downlink control channel and a resource location of an uplink data associated with the second downlink control channel and is configured for a respective second search space of the second search spaces.

Systems and methods for indicating positioning information in wireless communication systems are disclosed. In one aspect, a method includes receiving, by a wireless communication device from a network, network timing error information; and reporting, by the wireless communication device to the network, downlink measurement results and User Equipment (UE) timing error information, wherein, the network timing error information comprises at least one of Transmission and Reception Point (TRP) transmission Timing Error Group (TEG) information and TRP reception TEG information; the UE timing error information comprises at least one of UE transmission TEG information and UE reception TEG information.