Abstract: A method in a terminal device for transmission to at least a first network device and a second network device over bundled Transmission Time Intervals (TTIs). The method comprises determining that a first TTI for transmission to the first network device overlaps a second TTI for transmission to the second network device based on a first Timing Advance (TA) value associated with the first network device and a second TA value associated with the second network device; and blanking a portion of the first TTI, such that the rest of the first TTI does not overlap the second TTI.

Abstract: A method and device for transmitting information. The method for transmitting information includes: a digital beam-forming of a receiver is implemented on a received signal; weights of an analog beam-forming of a transmitter are calculated based on weights of the digital beam-forming or channel estimation information of the receiver; and the analog beam-forming of the transmitter is implemented on a signal to be transmitted.

Abstract: Embodiments of the present disclosure provide methods, apparatuses and computer program for facilitating reference signal transmission. An example method can be implemented at a base station in a wireless communication system for communicating with a terminal device. The terminal device is configured with a primary carrier and a secondary carrier for carrier aggregation. The method comprises determining a measurement gap. The measurement gap indicates a time interval for a terminal device to switch from the primary carrier to the secondary carrier for transmitting a reference signal to the base station over the secondary carrier and switch back to the primary carrier. The method also comprises triggering the terminal device to transmit the reference signal over the secondary carrier according to the measurement gap and obtaining a channel estimation based on the reference signal received from the terminal device during the measurement gap.

Abstract: There are disclosed a method, base station and computer-readable storage media for downlink power allocation in a wireless communication system. The method may comprise obtaining information on positions of user equipments in a cell; classifying the user equipments into cell-edge user equipments and non-cell-edge user equipments based on the obtained information on the positions of user equipments in the cell; and performing downlink power allocation by increasing power allocated to at least one of physical downlink control channels (PDCCH) for scheduled user equipments of the cell-edge user equipments and common reference signals with power borrowed from at least one of downlink common channels for scheduled user equipments of the non-cell-edge user equipments. With embodiments of the present disclosure, downlink transmit power can be allocated efficiently and thus cell downlink coverage may be increased at a low cost.

Abstract: The present disclosure provides a method and an apparatus in a radio base station for inter-transceiver antenna calibration. The method comprises collecting a first phase difference between a first signal and a first reception signal and a second phase difference between a second signal and a second reception signal. The first signal is transmitted through a reference transmission path of a first transceiver and received through a reference reception path of a second transceiver as the first reception signal. The second signal is transmitted through a reference transmission path of the second transceiver and received through a reference reception path of the first transceiver as the second reception signal. The method further comprises determining and compensating for an inter-loop phase response difference between a first reference path loop of the first transceiver and a second reference path loop of the second transceiver by subtracting the second phase difference from the first phase difference.

Abstract: A node and an access node and methods therein for handling random access is disclosed. A method in a node for random access in a wireless network comprises, determining a set of sub-carrier shifts, wherein each sub-carrier shift indicates a shift with respect to a starting position in frequency domain for transmitting a random access preamble. The method further comprises selecting a sub-carrier shift from the set of sub-carrier shifts. The method further comprises transmitting a random access preamble to an access node, wherein the random access preamble is transmitted according to the selected sub-carrier shift.

Abstract: The embodiments disclose a method of determining guard period for downlink-to-uplink switching in an access point of a time division duplex radio communication network. For each of a plurality of terminal devices served by the access point, the method comprising obtaining measurement information on uplink transmission delay of the terminal device due to the downlink-to-uplink switching and propagation delay; determining a time length of a guard period with respect to the terminal device based on the measurement information; assigning a time period scheduled for transmitting a uplink subframe with the time length as the guard period with respect to the terminal device; and informing the terminal device of the assignment.

Abstract: The present disclosure provides a method and an apparatus in a radio base station for inter-transceiver antenna calibration. The method comprises collecting a first phase difference between a first signal and a first reception signal and a second phase difference between a second signal and a second reception signal. The first signal is transmitted through a reference transmission path of a first transceiver and received through a reference reception path of a second transceiver as the first reception signal. The second signal is transmitted through a reference transmission path of the second transceiver and received through a reference reception path of the first transceiver as the second reception signal. The method further comprises determining and compensating for an inter-loop phase response difference between a first reference path loop of the first transceiver and a second reference path loop of the second transceiver by subtracting the second phase difference from the first phase difference.

Abstract: The present disclosure relates to a method used in a user terminal for performing random access to a network, and to the associated user terminal. The method includes: transmitting a random access request to the network, the random access request containing a preamble; receiving two or more random access responses from the network, the two or more random access responses corresponding to the preamble; selecting one random access response from the received two or more random access responses; and using resource indicated by the selected random access response for accessing to the network. The present disclosure also relates to a method used in a network node for controlling random access of one or more user terminals to the network node, and to the associated network node.

Abstract: The present disclosure provides a method implemented in a wireless communication device for determining an Angle of Arrival (AOA) of a wireless signal received at the wireless communication device. The method comprises estimating the AOA of the wireless signal, determining that the estimated AOA is ambiguous and acquiring signal strength measurements for the wireless signal received at two other wireless communication devices, which are located substantively symmetrically about a normal of the wireless communication device's antenna array. The method further comprises disambiguating the estimated AOA based on a comparison of the acquired signal strength measurements. The present disclosure also provides the wireless communication device as well as a Radio Base Station (RBS) comprising the wireless communication device.

Abstract: Embodiments of the present disclosure provide a method implemented in a first device for wireless communication. The method may comprise receiving a sequence of signals from a second device, the sequence of signals comprising a signal of a first type and a signal of a second type; assigning a first priority to the signal of the first type and a second priority lower than the first priority to the signal of the second type; and transmitting the sequence of signals via a transport network to a third device according to the assigned priorities. By virtue of this method, the processing delay at the third device may be reduced at low cost.

Abstract: Embodiments of the present disclosure provide a method in a base station for random access preamble detection. The method comprises determining a frequency offset of a received uplink signal and adjusting the received uplink signal with the determined frequency offset. The method also comprises detecting, from the adjusted uplink signal, whether there is a random access preamble with a first false alarm value. Additionally, the method may further comprise detecting from the received uplink signal, whether there is a random access preamble with a second false alarm value, before determining the frequency offset of the received uplink signal. Determining the frequency offset of the received uplink signal may be performed in response that a random access preamble is detected with the second false alarm value, the second false alarm value being higher than the first false alarm value.

Abstract: The present disclosure provides a method in a base station of a radio network for antenna calibration of a first transceiver of the base station with respect to a second transceiver. The method comprises at least one of a first group and a second group of steps. The first group of steps comprises collecting a first group of amplitude and phase differences between a first calibration signal and each of a first and a fourth reception signals and between a second calibration signal and each of a second and a third reception signals. The first group of steps further comprises estimating, based on the first group of amplitude and phase differences, a signal response characteristic difference between a calibration reception chain of the first transceiver and a calibration reception chain of the second transceiver for reference antenna reception calibration of the first transceiver with respect to the second transceiver.

Abstract: A method and a radio network node (800) for enabling a switch between transmission modes for sending downlink signals to a User Equipment, UE. A switching unit (800a) selects a first transmission mode when downlink signal quality in the UE is above a switching threshold (Th), and selects a second transmission mode when the downlink signal quality is below the switching threshold. An obtaining unit (800c) obtains a first performance level when the first transmission mode is used and the downlink signal quality is within a specific vicinity range from the switching threshold, and obtains a second performance level when the second transmission mode is used and the downlink signal quality is within the specific vicinity range. An adjusting unit (800d) then adjusts the switching threshold (Th) based on a deviation between the first performance level and the second performance level.

Abstract: A data exchange method in a Coordinated Multi-Point (CoMP), system, including an assistant point and a converging point. One method comprises selecting a predetermined number of subbands with the best channel quality, and exchanging user data of the selected subbands. Only part of the user data received at the assistant point is transmitted to the converging point. The requirement on the transport network capacity is thus loosened. By transmitting data with the best channel quality, a good enough gain is guaranteed.

Abstract: One embodiment relates to a method for transmitting a random access preamble in a transmitting sub-frame at a terminal device. The method (200) comprises: creating a random access preamble such that it comprises a plurality of random access sequences (S210); dividing the plurality of random access sequences into a number Nc of groups, each of groups including two or more random access sequences (S220); performing code division multiplexing with respect to the groups of the plurality of random access sequences in a frequency domain, based on an orthogonal cover code selected for the terminal device from a pre-defined code set (S230); and transforming signals after the code division multiplexing into the time domain (S240). There are provided corresponding methods and devices.

Abstract: The present disclosure relates to a method used in a BS for scheduling a UE, and an associated BS. The method includes: determining four sets of PUCCH format 1b with channel selection resources, which include a part of CCE-mapped dynamic HARQ feedback resources reserved for the UE transmitting HARQ feedback to the BS by using PUCCH format 1a/1b, each set including two PUCCH format 1b with channel selection resources; selecting one of the four sets of PUCCH format 1b with channel selection resources as candidate resources, which are available for the UE transmitting HARQ feedback to the BS by using PUCCH format 1b with channel selection; and transmitting to the UE an indication indicating the selected one of the four sets of PUCCH format 1b with channel selection resources. The present disclosure also relates to a method used in a UE for transmitting HARQ feedback to a BS by using PUCCH format 1b with channel selection, and an associated UE.

Abstract: A base station (14) in a mobile communication system operating according to a synchronized time division scheme comprises an antenna (26), a radio communication unit (24) for communicating with mobile stations of the system and an interference investigating unit (28) comprising a link quality measuring element (30), which obtains link quality measurements that are measured in the base station during uplink communication (UL) between at least one mobile station and the base station, a link quality evaluation element (32) that compares link quality measurements of at least one uplink channel with a link quality threshold and determines that the uplink channel is interfered by another base station if the link quality threshold is exceeded, a base station identifying element (34) that identifies the other base station via signals broadcast by the other base station and an interference limiting element (36) configured to perform an interference limitation activity based on the identification.

Abstract: Embodiments of the present disclosure provide a method in a base station for coordinating resources in a wireless communications system with carrier aggregation in which a first group of terminal devices is served by a primary cell and one or more secondary cells under control of the base station. The method comprises obtaining information indicating arrival of a second group of terminal devices at coverage of the base station. A speed of any terminal device of the second group is higher than a speed of any terminal device of the first group. The method also comprises releasing resources on at least one secondary cell of the one or more secondary cells and allocating the released resources to the second group of terminal devices.

Abstract: One embodiment of the present disclosure relates to a method for transmitting a random access preamble in a transmitting sub-frame at a terminal device. The method comprises: creating a random access preamble such that it comprises a plurality of random access sequences; dividing the plurality of random access sequences into a number Nc of groups, each of groups including two or more random access sequences; performing code division multiplexing with respect to the groups of the plurality of random access sequences in a frequency domain, based on an orthogonal cover code selected for the terminal device from a pre-defined code set; and transforming signals after the code division multiplexing into the time domain. According to an aspect of the present disclosure, there are provided corresponding methods and devices.