Techniques are provided for combining positioning reference signal (PRS) measurements coherently or non-coherently. An example method for combining positioning reference signal resources includes receiving a plurality of positioning reference signals associated with a positioning reference signal resource set or a transmission/reception point, coherently combining resource elements for two or more of the plurality of positioning reference signals received within a period of time, and non-coherently combining resource elements for two or more of the plurality of positioning reference signals received outside of the period of time.

Disclosed is a method comprising estimating a time synchronization accuracy associated with a plurality of base stations comprising at least a first base station and a second base station based at least partly on one or more uncertainty factors determined by the terminal device, selecting the second base station from the plurality of base stations by comparing the estimated time synchronization accuracy associated with the plurality of base stations, and synchronizing a clock based on the selected second base station.

A mobile station device that receives downlink control information which is used to selectively provide downlink scheduling or a random access order, on a physical downlink control channel from a base station device. The mobile station device also transmits a random access preamble using a random access channel to the base station device based on receiving the downlink control information which provides a random access order, where the downlink control information provides a downlink resource allocation in a case that the downlink control information is used to provide the downlink scheduling and where a preset value is set for a field of the downlink resource allocation in a case that the downlink control information is used to provide the random access order.

The exemplary embodiment of the present invention provides a method of synchronizing a femtocell base station securing time synchronization of a femtocell base station by allowing the femtocell base station to transmit a symbol to a terminal belonging to the femtocell by performing the time synchronization with a preamble signal when the femtocell base station receives the preamble signal from the macrocell base station in an orthogonal frequency division multiple access (OFDMA) communication system in which a femtocell is present in a macrocell.

A technique for selecting a set of radio resources of a cellular telecommunications network for radio resource aggregation in a communication between the telecommunications network and a User Equipment (UE) is provided. As to a method aspect of the technique, a time offset relative to a primary radio resource for each of at least two secondary radio resources is monitored. The primary radio resource and the at least two secondary radio resources are provided by the telecommunications network for radio resource aggregation. Out of the at least two secondary radio resources, a set of radio resources is selected so that the time offsets monitored for the selected secondary radio resources fall within a time window having a width equal to or less than the threshold, if a spread of the monitored time offsets exceeds a threshold.

Certain aspects of the present disclosure generally relate to position tracking of user equipment (UEs) using physical random access channel (PRACH) signals. According to certain aspects, a method is provided for wireless communications which may be performed, for example, by a base station (BS). The method generally includes communicating resources allocated for a physical random access channel (PRACH), a preamble sequence to be transmitted by a user equipment (UE) in the PRACH, and frame reference timings to neighboring cells; using a template based detector for PRACH to compute a timing advance using a shifted sequence that is closest to a profile of the preamble sequence received in the PRACH, and computing a first distance to the UE based on the computed timing advance.

Methods, systems, and devices for updating timing advance values for deactivated cells are described. A user equipment (UE) may transmit, to a first cell that is deactivated, a random access message for a timing advance probing procedure. The UE may transmit the random access message to the first cell. In some examples, the UE may receive, from a second cell, an activation command that activates the first cell and an indication of a timing advance value for the first cell generated based on the random access message. In other examples, the UE may monitor for a random access response (RAR) message from the first cell, the RAR message including an activation command that activates the first cell and an indication of a timing advance value generated based on the random access message. The UE may communicate with the first cell based on the activation command and the timing advance value.

A single wireless slave node may be in a timing virtual network (TVN) with neighboring wireless slave nodes. The single wireless slave node may store information indicative of the identity, link propagation delay, and channel signature of each of its neighboring wireless slave nodes. The single wireless slave node may repeatedly update a timing estimate based on the stored information and by performing a physical layer fast reference signal broadcast transmission and reception.

The present document discloses a method and a system for determining a delay difference, and a base station and UE, the method includes: a serving cell receiving information of time measured by a neighboring cell at which uplink channel/signal information of UE for determining a synchronization delay is received; and the serving cell determining a synchronization delay difference between the UE to the serving cell itself and the UE to the neighboring cell according to information of time which is measured by the serving cell at which the uplink channel/signal information of the UE for determining the synchronization delay is received, and the information of time measured by the neighboring cell and at which the uplink channel/signal information of the UE for determining the synchronization delay is received, wherein the uplink channel/signal information measured by the serving cell is the same as the uplink channel/signal information is measured by the neighboring cell.

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.