The invention relates to allocating resources in a carrier when several subcarrier spacing configurations coexists, and more particularly to avoid or at least reduce the loss of resources when introducing guard bands to avoid inter-numerology interferences. The invention proposes to start the allocation of resource blocks to a terminal on a different subcarrier than the first subcarrier. Therefore the invention proposes a method to allocate such resource blocks to a terminal.

Embodiments of the present invention provide a virtual multicarrier design for orthogonal frequency division multiple access communications. Other embodiments may be described and claimed.

The invention relates to allocating resources in a carrier when several subcarrier spacing configurations coexists, and more particularly to avoid or at least reduce the loss of resources when allocating in such a carrier. The invention proposes to align contiguous resource blocks (RB.sub.1) of a subcarrier spacing configuration (f.sub.1) on a raster of a different subcarrier spacing configuration (f.sub.0). Therefore the invention proposes a method to allocate such resource blocks to a terminal.

New radio (NR) shared spectrum (NR-SS) listen before talk (LBT) gap optimizations are disclosed in which an indication, such as the preemption indicator, may provide an indication of a communications gap, in which preemptive communications may occur, to a user equipment (UE) currently engaged in communications, whether the preemptive communications are to another UE or network node or through different signal channels. The gap and preemptive communication may be measured in full symbol lengths, sub-symbol lengths, or interlaces. The communication gap may provide sufficient resources for the preempting node to adequately obtain the shared channel via listen before talk (LBT) procedures, and for the original UE to resume communications after the gap. The communication gap may also be optimally configured in order to provide both the UE and preempting node as much communication resources as possible within the scheduled communication opportunities.

The present disclosure provides an orthogonal codes based code division multiplexing method of performing the code division multiplexing of demodulation reference signals in multiple layers of resource blocks by using orthogonal matrices, the method comprising: changing the order of chips in particular rows of a first orthogonal matrix to obtain a second orthogonal matrix with the changed order of chips; and multiplying the chips in respective rows of the second orthogonal matrix by the demodulation reference signals in corresponding layers of resource blocks correspondingly in the time direction to obtain code division multiplexing signals. The technical scheme of the present disclosure can improve the power jitter situation of downlink signals on the time, thereby the usage efficiency of the power amplifier at the base station side can be improved.

This application discloses a signal transmission method, including: mapping a first sequence into a first subcarrier group, and mapping a second sequence into a second subcarrier group. The subcarriers included in the first subcarrier group and the second subcarrier group are subcarriers on a same time domain symbol. The subcarriers in each of the first subcarrier group and the second subcarrier group are evenly distributed subcarriers. The first sequence is a Fourier transform sequence of a third sequence. The second sequence is a Fourier transform sequence of a fourth sequence. The elements at a same location in the third sequence and the fourth sequence are not both non-zero elements.

Techniques are disclosed for allocating time-frequency resources in a system that uses multiple multicarrier modulation numerologies. According to one aspect, a method in a first wireless node comprises allocating (1310) time-frequency resources for use by a second wireless node, where said allocating comprises selecting, for use in multicarrier modulation in the allocated time-frequency resources, one of two or more subcarrier bandwidths that the second wireless node is adapted to use for modulating or demodulating of data. In some embodiments, the method further comprises sending (1320) resource allocation information to the second wireless node, the resource allocation information identifying the allocated time-frequency resources.

A method and apparatus for transmitting or detecting primary synchronization signal. The receiver receives primary synchronization signal from a transmitter, and detects the sequence used in the received primary synchronization signal by using three root indexes. Here, the primary synchronization signal is generated by using a Zadoff-Chu sequence having one of the three root indexes. The three root indexes comprise a first index and a second index, and a sum of the first index and the second index corresponds to the length of the Zadoff-Chu sequence.

Technologies to improve band edge channel performance for radios are described. One device includes a baseband processor with an Orthogonal Frequency Division Multiplexing (OFDM) physical layer (PHY) parameter structure. The OFDM PHY layer parameter structure includes first parameter information that controls operation of an OFDM PHY in a first mode. The baseband processor establishes a wireless communication link with a second device and transmits first data to the second device in the first mode using a transmit power level. The baseband processor determines that the device is connected with the second device on a band edge channel that is adjacent to a restricted frequency band. The baseband processor modifies the first parameter information to second parameter information, the second parameter information controls operation of the OFDM PHY in a second mode. The baseband processor transmits transmit second data to the second device in the second mode using the transmit power level.

There is provided a method for limiting a spurious emission, the method performed by a user equipment (UE) and comprising: configuring a transceiver of the UE to use an operating band 71; and determining at least one operating band to be protected among a plurality of operating band, wherein if the determined operating band to be protected is an operating band 29, a maximum level of spurious emission is limited to 38 dBm for protecting other UE using the operating band 29.