Abstract: Methods, apparatuses, systems, devices, and computer program products directed to unique word (UW) discrete Fourier transform (DFT) spread and shaped orthogonal frequency division multiplexing (OFDM) (“UW DFT-S-S-OFDM”) based communications are provided. Among new methodologies and/or technologies provided is a method that may be implemented in transmitter and that may include any of: transforming a set of data symbols and a UW sequence into a frequency domain (“fDOM”) signal using a DFT; replicating the fDOM signal so as to form a plurality of fDOM signal instances, wherein the plurality of fDOM signal instances is inclusive of the fDOM signal; shaping one or more of the plurality of fDOM signal instances; combining the plurality of fDOM signal instances to form a combined fDOM signal; transforming the combined fDOM signal into a block-based signal using an inverse DFT (IDFT); and outputting the block-based signal.

Abstract: Systems, methods, and instrumentalities are disclosed for determining an uplink (UL) waveform type associated with a data symbol in an UL transmission, wherein the UL waveform type is determined based on a predefined condition, indicating the determined UL waveform type using symbols in a slot, and wherein the symbols comprise a reference signal of a first type, and wherein the symbols are prior to the data symbol in the slot, and transmitting, using the determined UL waveform type, the symbols comprising the reference signal of the first type and a data symbol.

Abstract: Systems, methods, and instrumentalities are disclosed for generating, transmitting, and/or receiving a hybrid spread waveform. The hybrid spread waveform may include a data portion and a hybrid guard interval (HGI) portion. The HGI portion may include a fixed prefix portion or a fixed suffix portion, and an adaptive low power tail (LPT) portion. The fixed prefix portion or the fixed suffix portion is a low power cyclic prefix (LPCP). The LPCP may be generated at least based on at least the channel delay spread and a power regrowth length. The adaptive LPT portion may be generated using a zero tail (ZT). The LPT is generated by inserting zeros at IFFT or DFT processing stage. A part of the adaptive LPT portion is used to carry data or control information. A waveform may be switched between a hybrid spread waveform and a fixed-CP waveform, e.g., via control signaling.

Abstract: Methods, devices, and systems for transmitting information using a unique word (UW) with discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM) are described herein. In an example, a wireless transmit/receive unit (WTRU) may generate a reference sequence. Further, the WTRU may generate a DMRS sequence based on upsampling of the reference sequence. In an example, the DMRS sequence may include a plurality of repeating sequences. Further, in an example, each repeating sequence may include a head sequence, a reference sequences and a tail sequence. Also, a UW sequence within the DMRS may include one of the repeated head sequences and one of the repeated tail sequences. In addition, the WTRU may generate a DMRS signal based on a waveform operation on the DMRS sequence. The WTRU may then transmit the DMRS signal as a reference signal.

Abstract: A method and apparatus for supporting communication buffer status reports (BSRs) are disclosed. A wireless device may receive from an eNode-B a first indication indicating a logical channel group and at least one associated priority. The wireless device may produce a BSR associated with first data, which may include an indication associated with the logical channel group and an index indicating an amount of the first data. The wireless device may transmit the BSR to an eNode-B. Then, the wireless device may receive receives allocation information for transmission to a wireless transmit/receive unit (WTRU) group. Further, the wireless device may transmit at least a portion of the first data to the WTRU group over a logical channel in the logical channel group. Also, the BSR may further include a plurality of indications associated with a respective plurality of logical channel groups.

Abstract: Systems, methods, and instrumentalities are disclosed for phase noise reference signal (PNRS) transmission, comprising receiving, at a wireless transmit receive unit (WTRU), scheduling information for a Physical Uplink Shared Channel (PUSCH) transmission, wherein the scheduling information includes an indication of a set of physical resource blocks (PRBs) and a modulation coding scheme (MCS) level, determining a density for the PNRS transmission based on at least one of: the MCS level, a frequency band for the PUSCH transmission, or a subcarrier spacing of the PUSCH transmission, and transmitting the PUSCH in the scheduled set of PRBs using the determined density of PNRS.

Abstract: A wireless transmit/receive unit (WTRU) may receive a grant-less (GL) transmission configuration that may include a first indication of a first set of resource blocks (RBs) for a first resource pool and a second indication of a second set of RBs for a second resource pool. The WTRU may select a subset of RBs in the first set, determine a subset of RBs in the second set based on the selected subset of RBs in the first set, and transmit UL data to the base station via the determined subset of RBs in the second set. The WTRU may receive a negative acknowledgement (NAK) with a third indication for at least one of a first transmission failure reason and a second transmission reason. The WTRU may adjust a backoff and determine a retransmission scheme based on the received third indication, and retransmit the UL data.

Abstract: Methods and apparatus for spectrum coordination are described. A method of spectrum coordination includes a spectrum coordinator receiving a request for shared spectrum from a CRS that the spectrum coordinator supports. The request includes at least one minimum protection requirement. The spectrum coordinator determines protection criteria for the CRS based on the at least one minimum protection requirement received from the CRS. The spectrum coordinator sends the protection criteria for the CRS to a geo-location database for use in assigning shared spectrum to other CRSs that the spectrum coordinator does not support.

Abstract: A method and apparatus for supporting communication buffer status reports (BSRs) are disclosed. A wireless device may transmit data to a wireless transmit/receive unit (WTRU) group, which may include a WTRU and further include its own respective at least one logical channel group. The wireless device may produce a BSR, which may include an indication associated with the logical channel group and an index indicating an amount of data for the logical channel group. The wireless device may transmit the BSR to an eNode-B. Then, the wireless device may receive receives allocation information for transmission to the WTRU group. Also, the BSR may further include a plurality of indications associated with a respective plurality of logical channel groups, and the plurality of logical channel groups may be grouped based on priority. The index may further include a total amount of data across all logical channels of the logical channel group.

Abstract: Systems, methods, and instrumentalities are disclosed for separating a channel and data without the use of reference signals. For example, a wireless transmit/receive unit (WTRU) may determine a first orthogonal frequency-division multiplexing (OFDM) symbol based on a data vector. The WTRU may determine a second OFDM symbol by applying a circular time-inverse operation and a conjugate operation to the first OFDM symbol. The WTRU may send the first OFDM symbol and the second OFDM symbol. The first and the second OFDM symbols may be sent to consecutively. Discrete Fourier Transform (DFT)-spread and nonlinear preprocessing (exponential transformation at the transmitter) may be used and/or peak-to-average power ratio (PAPR) may be reduced via randomizer block at the receiver.

Abstract: A method for increasing the efficiency and robustness of non-orthogonal multiple access (NOMA) schemes may include storing relationships that associate codewords with values of bit sets, receiving information bits and converting the information bits into bit sets, determining codewords associated with the bit sets, and transmitting the determined codewords. A first codeword may be pre-defined for a WTRU. A second codeword associated with a first bit set may be determined using a first relationship between the first codeword and a value of the first bit set. A third codeword associated with a second bit set may be determined using a second relationship between the second codeword and a value of the second bit set.

Abstract: Methods and systems for operation in a wireless network are provided, the methods including receiving modulated data symbols and zeros in a frequency-domain, and mapping in the frequency-domain the modulated data symbols and zeros in an interleaved manner to sub-carriers within a resource allocation. The methods and systems further include generating a time-domain data signal based on the mapped sub-carriers, and generating a time domain cancellation signal by sign inverting and repeating a predetermined number of time-domain samples at a tail portion of the data signal. The methods and systems further include combining the time-domain data signal and the time domain cancellation signal to generate an exact zero tail data signal such that the exact zero tail data signal has a zero tail length equal to the predetermined number of time-domain samples, and transmitting the exact zero tail data signal.

Abstract: Methods, apparatuses and systems are provided for grant-less (GL) uplink transmissions. A wireless transmit/receive unit (WTRU) may receive a configuration of a set of GL Physical Uplink Shared Channel (GL-PUSCH) frequency resources. The WTRU may monitor for a downlink control information (DCI) message, wherein the DCI message includes an indication of a presence of at least a subset of the set of GL-PUSCH frequency resources. If the WTRU successfully receives the DCI message, the WTRU may select one or more GL-PUSCH frequency resources from the subset of the set of GL-PUSCH frequency resources and may select a time period. The WTRU may transmit data on a GL-PUSCH using the selected GL-PUSCH frequency resources during the selected time period. The WTRU may also monitor for hybrid automatic repeat request acknowledgement (HARQ-ACK) based on the selected GL-PUSCH frequency resources. The WTRU may monitor for the DCI during a fixed time window.

Abstract: Systems, methods, and instrumentalities are disclosed for physical (PHY) layer multiplexing of different types of traffic in 5G systems. A device may receive a communication. The communication may include a first traffic type. The device may monitor the communication for an indication that the communication includes a second traffic type that is multiplexed with and/or punctures the first traffic type. An indicator received in the communication and detected by the monitoring may indicate where the second traffic type is located in the communication. The first traffic type and the second traffic type may be multiplexed at a resource element (RE) level. For example, a first traffic type may be punctured by a second traffic type at the RE level. The device may de code one or more of the first or second traffic types in the communication based on the indication.

Abstract: A wireless transmit/receive unit (WTRU), using mixed numerologies, may, in a first codeword, map a first set of bits to a higher order modulation scheme and a second set of bits to a lower order scheme, and transmit the first codeword. The WTRU may determine that data of the first codeword is to be re-transmitted on a second codeword, containing the same number of bits as the first codeword. In the second codeword, the WTRU may map a first set of bits to the lower order scheme and a second set of bits to the higher order scheme. The first set of bits of the second codeword may contain the same number of bits as the second set of bits of the first codeword and may contain at least a subset of data in the first set of bits of the first codeword. The WTRU may transmit the second codeword.

Abstract: Methods and systems for operation in a wireless network are provided, the method including receiving modulated data symbols and zeros in a frequency-domain, and mapping in the frequency-domain the modulated data symbols and zeros in an interleaved manner to sub-carriers within a resource allocation. The method further includes generating a time-domain data signal based on the mapped sub-carriers, and generating a time domain cancellation signal by sign inverting and repeating a predetermined number of time-domain samples at a tail portion of the data signal. The method further includes combining the time-domain data signal and the time domain cancellation signal to generate an exact zero tail data signal such that the exact zero tail data signal has a zero tail length equal to the predetermined number of time-domain samples, and transmitting the exact zero tail data signal.

Abstract: Methods, devices and systems are provided for performing a random access (RA) procedure. A wireless transmit/receive unit (WTRU) may be configured to receive RA resource sets, where each of the RA resource sets is associated with a node-B directional beam, select an RA resource set from among the RA resource sets, and initiate an RA procedure based on the selected RA resource set. The RA procedure may include selecting multiple preambles which include a preamble for each resource of a plurality of resources corresponding to the selected RA resource set. The WTRU may be configured to sequentially transmit the selected multiple preambles in sequential RA transmissions, and may be configured to receive, from a node-B, in response to the RA transmissions, at least one RA response (RAR), where each of the received at least one RAR corresponds to one of the transmitted multiple preambles.

Abstract: Methods, devices, and systems for transmitting information using a unique word (UW) with discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM) are described herein. In an example, a wireless transmit/receive unit (WTRU) may generate a reference sequence. Further, the WTRU may generate a DMRS sequence based on upsampling of the reference sequence. In an example, the DMRS sequence may include a plurality of repeating sequences. Further, in an example, each repeating sequence may include a head sequence, a reference sequences and a tail sequence. Also, a UW sequence within the DMRS may include one of the repeated head sequences and one of the repeated tail sequences. In addition, the WTRU may generate a DMRS signal based on a waveform operation on the DMRS sequence. The WTRU may then transmit the DMRS signal as a reference signal.

Abstract: A wireless transmit receive unit (WTRU) may monitor downlink short transmission time intervals (sTTIs) for a sTTI physical downlink control channel (sPDCCH) region. The WTRU may determine the sPDCCH region from a set of candidate sPDCCH regions for an uplink grant. The sPDCCH may be determined based on a WTRU-specific parameter.

Abstract: Methods and apparatus are described. A method, implemented in a wireless transmit/receive unit (WTRU) includes monitoring a first control channel search space (SS) associated with a first normal beam set comprising a first beam set. The WTRU initiates extended monitoring and monitors, subsequent to a trigger based on a measurement by the WTRU, a control channel SS associated with an extended beam set comprising the first beam set and one or more additional beam sets. The WTRU determines a second beam set from the extended beam set. The determination is based on a received control channel beam switch command or based on a control channel SS in which a beam switch command is received. The WTRU monitors a second control channel SS associated with a second normal beam set comprising the determined second beam set.