The present specification provides a method by which a user equipment (UE) simultaneously accesses a plurality of cells. The simultaneously access method can comprise the steps of: setting connections with a first cell of a frequency division duplex (FDD) scheme and a second cell of a time division duplex (TDD) scheme; and transmitting and receiving a control signal and data to and from the first cell of the FDD scheme and the second cell of the TDD scheme. Here, an uplink subframe and a downlink subframe for the first cell of the FDD scheme can be temporally divided according to the TDD scheme and provided to the UE.

Communication equipment communicating in a licensed frequency band identifies unused unlicensed communication resources within an unlicensed frequency band. The communication equipment uses the identified unlicensed communication resources to communicate within the unlicensed frequency band. In some circumstances, the unused unlicensed communication resources are identified based on resource information received from a base station where the resource information identifies unlicensed communication resources that will be used by the base station. In other circumstances, the unused unlicensed communication resources are identified based on frequency band measurements of the unlicensed frequency band over an observation time duration longer than a sensing time duration used by unlicensed equipment using the unlicensed frequency band.

A communication method, a base station, user equipment, and a system are provided. The method includes: receiving uplink data that is sent by the user equipment in a specified multiple-access manner on a time-frequency resource corresponding to the specified multiple-access manner; and sending downlink data to the user equipment in a corresponding multiple-access manner on a time-frequency resource corresponding to the corresponding multiple-access manner, where the corresponding multiple-access manner is a multiple-access manner that is obtained by searching a at least two multiple-access manners according to a prestored correspondence and that is associated with the specified multiple-access manner. In this way, a problem that because one multiple-access manner is used in a same communications system, requirements of different user equipments cannot be met at the same time is resolved.

The apparatus may be a base station. The apparatus processes a plurality of synchronization signals by performing time-division multiplexing (TDM) of at least one of a plurality of first synchronization signals of different types and at least one of the plurality of second synchronization signals of different types, the plurality of synchronization signals including the plurality of first synchronization signals and the plurality of second synchronization signals. The apparatus transmits the processed synchronization signals to a user equipment (UE).

The apparatus may be a base station. The apparatus processes a first group of synchronization signals. The apparatus processes a second group of synchronization signals. The apparatus performs a first transmission by transmitting the processed first group of the synchronization signals in a first synchronization subframe. The apparatus performs a second transmission by transmitting the processed second group of the synchronization signals in a second synchronization subframe.

The present invention relates to a method for allocating communication resources in a multi-user cellular communication system, wherein communication resources are divided in time periods and frequency sub-bands, wherein part of the communication resources are used for frequency-localized communication channels, and part of the communication resources are used for frequency distributed channels. The method further comprises the steps of: classifying part of the frequency sub-bands as frequency sub-bands carrying frequency-distributed channels, classifying the remaining part of the frequency sub-bands as frequency sub-bands carrying frequency-localized channels. The present invention also relates to a system, a transmitter and a communication system.

Methods and apparatuses are provided in which a user equipment (UE) receives a system information block (SIB) from a network. The UE identifies at least one downlink (DL) period based on a first uplink (UL)/DL configuration included in the SIB. The UE monitors a physical downlink control channel (PDCCH) during the at least one DL period using a discontinuous reception (DRX) operation. The UE obtains downlink control information (DCI) for indicating at least one second UL/DL configuration as a format for one or more time intervals from the monitored PDCCH. The UE determines the format for the one or more time intervals based on the obtained DCI. The monitoring of the PDCCH includes monitoring the PDCCH in an active time of a DRX cycle. The active time includes a time when the UE performs continuous reception.

A method in a network node for multiplexing a physical channel between the network node and devices in a mixed wireless network, wherein the mixed wireless network comprises a cellular network comprising one or more cellular channels and a Device-to-Device (D2D) network comprising one or more D2D channels. The method includes time division multiplexing the physical channel between a first group of cellular channels and a first group of D2D channels, and frequency division multiplexing the physical channel between a second group of cellular channels and the first group of D2D channels.

A system and method for mapping a combined frequency division duplexing (FDD) Time Division Multiplexing (TDM)/Time Division Multiple Access (TDMA) downlink subframe for use with half-duplex and full-duplex terminals in a communication system. Embodiments of the downlink subframe vary Forward Error Correction (FEC) types for a given modulation scheme as well as support the implementation of a smart antenna at a base station in the communication system. Embodiments of the system are also used in a TDD communication system to support the implementation of smart antennae. A scheduling algorithm allows TDM and TDMA portions of a downlink to efficiently co-exist in the same downlink subframe and simultaneously support full and half-duplex terminals.

Systems and methods for flexible channelization are provided. Different TU sizes are used for transmissions by different UEs. The different UEs may use different access schemes, and may transmit using time frequency resources that at least partially overlap.