This disclosure relates to providing synchronization signal block index signaling in a cellular communication system. A cellular base station may provide synchronization signals according to a periodic pattern, including transmitting one or more synchronization signal bursts each including one or more synchronization signal blocks. A wireless device may detect a synchronization signal block. The wireless device may determine a synchronization signal block index of the detected synchronization signal block. The wireless device may provide an indication of the synchronization signal block index of the detected synchronization signal block to the cellular base station.

This disclosure relates to providing synchronization signal block index signaling in a cellular communication system. A cellular base station may provide synchronization signals according to a periodic pattern, including transmitting one or more synchronization signal bursts each including one or more synchronization signal blocks. A wireless device may detect a synchronization signal block. The wireless device may determine a synchronization signal block index of the detected synchronization signal block. The wireless device may provide an indication of the synchronization signal block index of the detected synchronization signal block to the cellular base station.

A wireless communication method, a network device and a terminal device are provided. The method comprises: transmitting a first control channel in a first period of time, wherein the first control channel carries scheduling information of a first data channel; receiving or transmitting the first data channel in a second period of time according to the scheduling information of the first data channel; transmitting a second control channel in a frequency division multiplexing manner with the first data channel at part time of the second period of time, wherein a data channel scheduled by the second control channel does not include the first data channel, and a starting position of the part time is not earlier than an ending position of the first period of time.

A signal interface unit for a distributed antenna system includes a channelized radio carrier interface configured to communicate an uplink channelized radio carrier for a radio frequency carrier to a channelized radio carrier base station interface; an antenna side interface configured to receive an uplink digitized radio frequency signal from the distributed antenna system communicatively coupled to the antenna side interface, wherein the uplink digitized radio frequency signal includes baseband data having bits; and a signal conversion module communicatively coupled between the channelized radio carrier interface and the antenna side interface and configured to convert between the uplink digitized radio frequency signal and the uplink channelized radio carrier at least in part by performing an adjustment of the bits included in the baseband data for the uplink digitized radio frequency signal received from the distributed antenna system to comply with requirements of the channelized radio carrier base station interface.

A signal receiving method, an apparatus and a communication system. The network device determines a subcarrier location of a to-be-sent first signal and a subcarrier location of a to-be-sent second signal, where subcarriers occupied by the first signal are continuous subcarriers in a first group of resource elements, subcarriers occupied by the second signal are continuous subcarriers in a second group of resource elements, a quantity of the subcarriers occupied by the first signal is the same as a quantity of the subcarriers occupied by the second signal, and a subcarrier spacing in the first group of resource elements is different from a subcarrier spacing in the second group of resource elements, the first signal and the second signal are primary synchronization signals. The network device sends the first signal to the terminal device and sends the second signal to the terminal device or other terminal device.

The present invention is designed to improve spectral efficiency in a system that runs LTE/LTE-A by using a carrier in which LBT (Listen Before Talk) is configured. One aspect of the present invention provides a radio base station in a radio communication system where the radio base station and a user terminal communicate by using a carrier in which LBT is configured, and this radio base station has a measurement section that executes LBT in a predetermined carrier sensing duration and acquires an LBT result, and a transmission section that transmits a downlink signal based on the LBT result, and the predetermined carrier sensing duration includes a first carrier sensing duration and a second carrier sensing duration, which is shorter than the first carrier sensing duration.

A signal interface unit for a distributed antenna system (DAS) includes a channelized radio carrier interface configured to receive a downlink channelized radio carrier for a radio frequency carrier from a channelized radio carrier base station interface; an antenna side interface configured to communicate a downlink digitized radio frequency signal from the antenna side interface to the DAS communicatively coupled to the antenna side interface; and a signal conversion module communicatively coupled between the channelized radio carrier interface and the antenna side interface and configured to convert between the downlink channelized radio carrier and the downlink digitized radio frequency signal at least in part by adjusting at least one downlink attribute of the downlink digitized radio frequency signal communicated to the DAS based on requirements of the channelized radio carrier base station interface to cause the DAS to appear as a remote radio head to the channelized radio carrier interface.

Embodiments of the invention provide advances in liquid-crystal technology for use as tunable phase-delay lines. The amount of phase delay through the liquid crystal is adaptively tuned, in order to coherently combine two signals, regardless of their phase differences. By adaptively adjusting the phase delays in the two signal paths, maximum coherent power combining is ensured. This ability to coherently combine the power of two signals regardless of their initial phase differences can greatly simplify, for example, antenna-diversity techniques used in MIMO applications as well as other applications.

This disclosure relates to providing synchronization signal block index signaling in a cellular communication system. A cellular base station may provide synchronization signals according to a periodic pattern, including transmitting one or more synchronization signal bursts each including one or more synchronization signal blocks. A wireless device may detect a synchronization signal block. The wireless device may determine a synchronization signal block index of the detected synchronization signal block. The wireless device may provide an indication of the synchronization signal block index of the detected synchronization signal block to the cellular base station.

A wireless device (14) is configured to perform a random access procedure (16) for random access by the wireless device (14) to a wireless communication system (10). The random access procedure (16) includes multiple messages in sequence. The wireless device (14) is configured to determine a carrier on which a downlink message (18) in the random access procedure (16) is to be received by the wireless device (14), from amongst multiple different carriers (20) which are configurable as said carrier, based on configuration information (22) received from a radio network node (12) indicating said carrier. The downlink message (18) occurs in the random access procedure (16) subsequent to an initial message in the sequence. The wireless device (14) is also configured to receive the downlink message (18) on the determined carrier.