An uplink transmission method includes obtaining control information useable for uplink transmission with dynamic scheduling, determining based on information about a first time-frequency resource allocated to the uplink transmission and configuration information of a first reference signal useable for the uplink transmission, a second time-frequency resource useable to send the first reference signal, obtaining first information of a semi-statically configured resource useable for the uplink transmission, and in response to performing the uplink transmission based on the control information, sending, by the communications apparatus on an overlapping time-frequency resource of a second time-frequency resource and a third time-frequency resource, a reference signal generated based on configuration information of a second reference signal or failing to send a signal. The control information includes information about the first time-frequency resource allocated to the uplink transmission and configuration information of the first reference signal useable for the uplink transmission.

Systems and methods for selecting subcarriers to be used for sub-Physical Resource Block (PRB) transmission and, in some embodiments, for mapping Demodulation Reference Signals (DMRS) to resources on the selected subcarriers are disclosed. In some embodiments, a method of operation of a radio node for providing sub-PRB transmission comprises selecting two adjacent subcarriers from a set of three allocated subcarriers that are allocated for a sub-PRB transmission that uses Single Carrier Frequency Division Multiple Access (SC-FDMA) Pi/2 Binary Phase Shift Keying (BPSK) modulation using only two adjacent subcarriers out of the set of three allocated subcarriers with Discrete Fourier Transform (DFT) spread length of 2. In some embodiments, the selection is such that the selected adjacent subcarriers varies, e.g., from one cell to another. In doing so, interference is distributed.

Methods, systems, and devices for wireless communications are described. In some examples, a base station or other network entity may allocate uplink resources to UEs, or groups of UEs, that are subsequently reallocated. For example, a base station may determine a reallocation of uplink resources and issue a cancellation or preemption indication that may correspond to at least a portion of the previously-allocated resources (e.g., as allocated to particular UEs). UEs may be configured to monitor for cancellation or preemption indications, and based on received cancellation or preemption indications, UEs may determine whether or not to proceed with an uplink transmission using their previously-allocated uplink resources.

A method of assigning transmission resources by an access node includes allocating first transmission resources to a first device, and allocating second transmission resources to a second device, wherein the second transmission resources partially, but not completely, overlap the first transmission resources. An amount of overlap between the first transmission resources and the second transmission resources may be based on a target error rate for decoding transmissions received from the first device and the second device and/or a signal to interference plus noise ratio (SINR) of transmissions from the first device and the second device. Related access nodes are disclosed.

Embodiments of the disclosure provide a method and apparatus for performing fractional subframe transmission. The method may comprise: in response to detecting that a channel becomes available, determining a target position from at least one potential position predefined in a subframe; and performing the fractional subframe transmission from the target position.

A method includes transmitting a random access preamble, receiving a random access response as a response of the random access preamble, wherein the random access response comprises an uplink resource assignment and a request for transmission of a Channel Quality Indicator (CQI), and transmitting the CQI in the uplink resource assignment.

A method for operating a communications controller includes defining a positive integer quantity of resource element groups from a resource block with a positive integer number N resource elements in each resource element group, the resource block having a total number of resource elements, the total number of resource elements consisting of available resource elements and reserved resource elements. The method also includes assigning a plurality of available resource elements to fill in each of the positive integer quantity of resource element groups with N available resource elements in each resource element group, and blocking any unassigned available resource elements from being used in a resource element group. The method further includes interleaving a plurality of control messages onto the positive integer quantity of resource element groups, and transmitting the positive integer quantity of resource element groups.

A method for grouping of CS (and comb values) for DM-RS and SRS on shared time-frequency resources is described. The method includes dividing a RS space into at least a first region and a second region. The method also includes allocating, from the first region, a DM-RS sequence CS and/or a DM-RS comb for a DM-RS; and allocating, from the second region, a SRS sequence CS and/or a SRS comb for a SRS. The DM-RS and the SRS are on the same resources on an uplink shared channel (such as a PUSCH for example). The RS space comprises at least one of a CS set and a IFDM comb set. The CS set and/or the IFDM comb set of the first region is based at least in part on a number of physical resource blocks allocated to the uplink shared channel. Apparatus and computer readable media are also described.

According to a first aspect there is presented a method for synchronization in a wireless device-to-device (D2D) based communications network as performed by a first wireless device. The method comprises identifying an attempt to make a network connection on a default sub-channel over a D2D communications interface from a second wireless device. The method comprises transmitting control information on the default sub-channel to the second wireless device, wherein the control information comprises an indicator of an operational sub-channel, and wherein the operational sub-channel is for subsequent D2D communication between the first wireless device and the second wireless device.

Mobile devices, base stations, and/or relay stations may implement methods for decreasing required guard bands while also minimizing Adjacent Channel Leakage Ratio, when multiple mobile devices communicate over different respective adjacent specified frequency bands. For communications over at least one specified frequency band of the different respective adjacent frequency bands, a first bandwidth of uplink communications and/or a second bandwidth of downlink communications may be adjusted to differ from each other, and/or a communications bandwidth within the specified frequency band may be adjusted to be of a first size during a first portion of a specified data transmission period and to be of a second size during a second portion of the specified data transmission period, when at least some of the communications over the specified frequency band take place at frequencies adjacent to frequencies at which at least some of the communications take place over another specified frequency band.