WO2022115884A2 - Method of reference signal design for nr-u beyond 52.6ghz - Google Patents

Abstract

A method of wireless communication includes a next generation Node B (gNB) configuring a user equipment (UE) with radio resource control (RRC) parameters, selecting a pattern of signal allocation and distribution symmetric in time, frequency, and space, the pattern indicating orthogonal frequency division multiplexing (OFDM) symbol tones and subcarrier of a reference signal (RS), transmitting, to the UE, downlink control information (DCI) indicating the selected pattern, and transmitting at least one or more phase tracking reference signal (PT-RS) and demodulation reference signal (DMRS) in accordance with the RRC parameters and selected pattern.

Description

Method of Reference Signal Design for NR-U Beyond 52.6GHz PRIORITY CLAIM AND CROSS REFERENCE [0001] This application claims the benefit of U.S. Provisional Patent Application No. 63/171,009, filed April 5, 2021 entitled “Method of Reference Signal Design for NR-U Beyond 52.6GHz,” which application is hereby incorporated herein by reference in its entirety. TECHNICAL FIELD [0002] The present invention relates generally to managing the allocation of resources in a network, and in particular embodiments, to techniques and mechanisms to make efficient use of reference signals (RSs) considering their dual-purpose of inter- carrier interference (ICI) cancellation and channel estimation for single physical downlink shared channel (PDSCH) and multi-PDSCH. BACKGROUND [0003] Inter-carrier interference/common phase error (ICI/CPE) caused by stronger phase noise (PN), which can distort the signal constellation and negatively affects channel estimation (CE) accuracy, is typically larger and notably difficulty to overcome in the frequency band from 52.6 to 71GHz (standards range 2-2 (FR2-2). The conventional approach is to have phase tracking reference signal (PT-RS) used only for ICI/CPE cancellation and demodulation reference signal (DMRS) used for CE. For single and multiple physical downlink shared channel/physical uplink shared channel (PDSCH/PUSCH) operating in this band, this conventional approach can negatively impact block error rate (BLER) performance. If increasing reference signal (RS) density is not allowed, then an efficient way is needed to utilize these RS for efficient demodulation with similar overhead. SUMMARY OF THE INVENTION [0004] Technical advantages are generally achieved, by embodiments of this disclosure which allow PT-RS to serve dual-purpose such that better ICI mitigation and more accurate CE are attained, leading to BLER performance improvement for higher SCSs for FR2-2, describe a new non-uniform window to boost the power of PT-RS pilots to attain better ICI mitigation, and describe flexible TD DMRS allocations for multi- PDSCH/PUSCH to attain BLER performance improvement for higher SCSs for FR2-2. [0005] In accordance with an embodiment, a method of wireless communication is provided. The method comprises a next generation Node B (gNB) configuring a user equipment (UE) with radio resource control (RRC) parameters, selecting a pattern of signal allocation and distribution in time, frequency, and space, the pattern indicating orthogonal frequency division multiplexing (OFDM) symbol tones and subcarrier of a reference signal (RS), transmitting to the UE, downlink control information (DCI) indicating the selected pattern, and transmitting at least one or more phase tracking reference signal (PT-RS) and demodulation reference signal (DMRS) in accordance with the RRC parameters and selected pattern. [0006] Optionally, in any of the preceding aspects, the pattern is in accordance with the PT-RS tones of each symbol to occupy the odd-numbered subcarriers, such that the associated channel estimation (CE) is combined with DMRS symbols, the DMRS symbols also occupying the odd-numbered subcarriers. [0007] Optionally, in any of the preceding aspects, the pattern is in accordance with the PT-RS being present in all symbols without DMRS. [0008] Optionally, in any of the preceding aspects, the pattern is in accordance with a single-layered PT-RS, staggering PT-RS density in frequency domain and wherein every other PT-RS resource element (RE) is used for one layer PT-RS associated with one DMRS port by QCL-ed relationship that is Quasi collocated with the corresponding DMRS port. [0009] Optionally, in any of the preceding aspects, the pattern is in accordance with staggering different-layer PT-RS in the time domain, the PT-RS resource elements (REs) of each layer being a quasi-co-located (QCL-ed) with a DMRS port, and the different- layers being staggered in different OFDM symbols. _[0010] In accordance with another embodiment, a method of wireless communication is provided. The method comprises a user equipment (UE) receiving radio resource control (RRC) parameters, decoding an indicator field, the indicator field indicating if new patterns are transmitted, performing channel estimation (CE) and inter-carrier interference (ICI) cancellation in accordance with the new transmitted patterns, and signaling messaging in accordance with the CE and ICI cancellation. [0011] Optionally, in any of the preceding aspects, the new patterns are in accordance with the phase tracking reference signal (PT-RS) tones of each symbol to occupy the odd-numbered subcarriers, such that the associated channel estimation (CE) is combined with demodulation reference signal (DMRS) symbols, the DMRS symbols also occupying the odd-numbered subcarriers. [0012] Optionally, in any of the preceding aspects, the new patterns are in accordance with the phase tracking reference signal (PT-RS) being present in all symbols without demodulation reference signal (DMRS). [0013] Optionally, in any of the preceding aspects, the new patterns are in accordance with a single-layered PT-RS, staggering PT-RS density in frequency domain and wherein every other PT-RS resource element (RE) is used for one layer PT-S associated with one demodulation reference signal (DMRS)port by QCL-ed relationship, that is Quasi collocated with the corresponding DMRS port. [0014] Optionally, in any of the preceding aspects, the new pattern is in accordance with staggering different-layer PT-RS in the time domain, the PT-RS resource elements (REs) of each layer being a quasi-co-located (QCL-ed) with a demodulation reference signal (DMRS) port, and the different-layers being staggered in different OFDM symbols. [0015] In accordance with yet another embodiment, a method of wireless communication is provided. The method comprises a user equipment (UE) obtaining radio resource control (RRC) parameters and downlink control information (DCI) for scheduling, decoding the DCI indicating a selected pattern, receiving phase tracking reference signal (PT-RS) and demodulation reference signal (DMRS) in accordance with the RRC parameters and the selected pattern, and transmitting signaling in accordance with a reference signal (RS) based on the DCI indication to compensate the phase noise (PN), and further in accordance with an iterative or simultaneous channel estimation (CE). [0016] In accordance with yet another embodiment, a method of wireless communication is provided. The method comprises a next generation Node B (gNB) providing to a user equipment (UE), at least one of a flexible phase tracking reference signal (PT-RS) or demodulation reference signal (DMRS) configurations for single slot and multi-slot scheduling transmissions, and communicating to the UE, using at least one of the flexible phase tracking reference signal (PT-RS) or demodulation reference signal (DMRS) configurations for the single slot and multi-slot scheduling transmissions. [0017] Optionally, in any of the preceding aspects, the configuration for PT-RS changes the subcarrier allocation on different orthogonal frequency division multiplexing (OFDM) symbols within a PDSCH or PUSCH transmission. [0018] Optionally, in any of the preceding aspects, the subcarrier or resource element (RE) location in OFDM symbol for PT-RS mapping changes every N symbol, where N is an integer which is at least 1. [0019] In accordance with yet another embodiment, a method of multi-slot transmissions of physical downlink shared channel (PDSCH) or physical uplink shared channel (PUSCH) is provided. The method comprises a device transmitting a single downlink control information (DCI) to schedule PDSCH or PUSCH transmissions in multiple slots and transmitting a plurality of messages in different slots in at least two transmission blocks (TBs), wherein the number of slots for the message transmission is indicated by downlink control information (DCI), radio resource control (RRC) parameters, or by a combination of both. [0020] Optionally, in any of the preceding aspects, the first slot is allocated with more demodulated reference signal (DMRS) symbols than the subsequent slots of the PDSCH or PUSCH transmissions scheduled with a single DCI. [0021] Optionally, in any of the preceding aspects, the number of DMRS symbols being allocated is non-uniform in the sequence of PDSCH or PUSCH scheduled with the same DCI. [0022] Optionally, in any of the preceding aspects, the number of DMRS symbols being allocated is decreasing in time. [0023] In accordance with yet another embodiment, a next generation Node B (gNB) is provided. The gNB comprises a non-transitory memory storage comprising instructions and one or more processors in communication with the memory storage, the one or more processors executing the instructions to configure a user equipment (UE) with radio resource control (RRC) parameters, select a pattern of signal allocation and distribution in time, frequency, and space, the pattern indicating orthogonal frequency division multiplexing (OFDM) symbol tones and subcarrier of a reference signal (RS);, transmit downlink control information (DCI) indicating the selected pattern, and transmit at least one or more phase tracking reference signal (PT-RS) and demodulation reference signal (DMRS) in accordance with the RRC parameters and selected pattern. [0024] Optionally, in any of the preceding aspects, the pattern is in accordance with the PT-RS tones of each symbol to occupy the odd-numbered subcarriers, such that the associated channel estimation (CE) is combined with DMRS symbols, the DMRS symbols also occupying the odd-numbered subcarriers. [0025] Optionally, in any of the preceding aspects the pattern is in accordance with the PT-RS being present in all symbols without DMRS. [0026] Optionally, in any of the preceding aspects the pattern is in accordance with a single-layered PT-RS, staggering PT-RS density in frequency domain and, wherein every other PT-RS resource element (RE) is used for one layer PT-S associated with one DMRS port by QCL-ed relationship, that is Quasi collocated with the corresponding DMRS port. [0027] Optionally, in any of the preceding aspects, the pattern is in accordance with staggering different-layer PT-RS in the time domain, the PT-RS resource elements (REs) of each layer being a quasi-co-located (QCL-ed) with a DMRS port, and the different- layers being staggered in different OFDM symbols. [0028] In accordance with yet another embodiment, a user equipment (UE) is provided. The UE comprises a non-transitory memory storage comprising instructions; and one or more processors in communication with the memory storage, the one or more processors executing the instructions to receive radio resource control (RRC) parameters, decode an indicator field, the indicator field indicating if new patterns are transmitted, perform channel estimation (CE) and inter-carrier interference (ICI) cancellation in accordance with the new transmitted patterns, and signal messaging in accordance with the CE and ICI cancellation. [0029] Optionally, in any of the preceding aspects, the new patterns are in accordance with the phase tracking reference signal (PT-RS) tones of each symbol to occupy the odd-numbered subcarriers, such that the associated channel estimation (CE) is combined with demodulation reference signal (DMRS)symbols, the DMRS symbols also occupying the odd-numbered subcarriers. [0030] Optionally, in any of the preceding aspects, the new patterns are in accordance with the phase tracking reference signal (PT-RS) being present in all symbols without demodulation reference signal (DMRS). [0031] Optionally, in any of the preceding aspects, the new patterns are in accordance with a single-layered PT-RS, staggering phase tracking reference signal (PT- RS) density in frequency domain and wherein every other PT-RS resource element (RE) is used for one layer PT-S associated with one demodulation reference signal (DMRS)port by QCL-ed relationship, that is Quasi collocated with the corresponding DMRS port. [0032] Optionally, in any of the preceding aspects, the new patterns are in accordance with staggering different-layer phase tracking reference signal (PT-RS)in the time domain, the PT-RS resource elements (REs) of each layer being a quasi-co-located (QCL-ed) with a demodulation reference signal (DMRS)port, and the different-layers being staggered in different OFDM symbols. [0033] In accordance with yet another embodiment, a user equipment (UE) is provided. The UE comprises a non-transitory memory storage comprising instructions; and one or more processors in communication with the memory storage, the one or more processors executing the instructions to obtain radio resource control (RRC) parameters and downlink control information (DCI) for scheduling, decode the DCI indicating a selected pattern, receive phase tracking reference signal (PT-RS) and demodulation reference signal (DMRS) in accordance with the RRC parameters and the selected pattern, and transmit signaling in accordance with a reference signal (RS) based on the DCI indication to compensate the phase noise (PN), and further in accordance with an iterative or simultaneous channel estimation (CE). [0034] In accordance with yet another embodiment, a next generation Node B (gNB) is provided. The gNB comprises a non-transitory memory storage comprising instructions and one or more processors in communication with the memory storage, the one or more processors executing the instructions to provide to a user equipment (UE), at least one of a flexible phase tracking reference signal (PT-RS) or demodulation reference signal (DMRS) configurations for single slot and multi-slot scheduling transmissions and communicate to the UE using at least one of the flexible phase tracking reference signal (PT-RS) or demodulation reference signal (DMRS) configurations for the single slot and multi-slot scheduling transmissions. [0035] Optionally, in any of the preceding aspects, the configuration for PT-RS changes the subcarrier allocation on different orthogonal frequency division multiplexing (OFDM) symbols within a PDSCH or PUSCH transmission. [0036] Optionally, in any of the preceding aspects, the subcarrier or resource element (RE) location in OFDM symbol for PT-RS mapping changes every N symbol, where N is an integer which is at least 1. [0037] In accordance with yet another embodiment, a next generation Node B (gNB) is provided. The gNB comprises a non-transitory memory storage comprising instructions and one or more processors in communication with the memory storage, the one or more processors executing the instructions to transmit a single downlink control information (DCI) to schedule PDSCH or PUSCH transmissions in multiple slots and transmit a plurality of messages in different slots in at least two transmission blocks (TBs), wherein the number of slots for the message transmission is indicated by downlink control information (DCI), radio resource control (RRC) parameters, or by a combination of both. [0038] Optionally, in any of the preceding aspects, the first slot is allocated with more demodulated reference signal (DMRS) symbols than the subsequent slots of the PDSCH or PUSCH transmissions scheduled with a single DCI. [0039] Optionally, in any of the preceding aspects, the number of DMRS symbols being allocated is non-uniform in the sequence of PDSCH or PUSCH scheduled with the same DCI. [0040] Optionally, in any of the preceding aspects, the number of DMRS symbols being allocated is decreasing in time. BRIEF DESCRIPTION OF THE DRAWINGS [0041] For a more complete understanding of the present disclosure, and the advantages thereof, reference is now made to the following descriptions taken in conjunction with the accompanying drawings, in which: [0042] FIG.1 illustrates a diagram of an embodiment wireless communications network; _[0043] FIG.2 illustrates a diagram of phase noise impact on 64-QAM constellation; [0044] FIG.3 illustrates examples of legacy PT-RS configurations; [0045] FIG.4 illustrates a diagram of an example embodiment of DCI scheduling multi-slot PDSCH; [0046] FIG.5 illustrates a diagram of an example embodiment of a carrier grid with dual-purpose PT-RS with a new staggering pattern; [0047] FIG.6 illustrates a flow diagram of a CE procedure with the dual-purpose PT-RS pattern according to example embodiments disclosed herein; [0048] FIG.7 illustrates a diagram of BLER comparison between the legacy and proposal CE schemes under 960kHz SCS, 15ns DS; [0049] FIG.8 illustrates a diagram of BLER comparison between the legacy and proposal CE schemes under 960kHz SCS, 15ns DS; [0050] FIG.9 illustrates a diagram of BLER comparison between the legacy and proposal CE schemes under 480kHz SCS, 30ns DS; [0051] FIG.10 illustrates a diagram of MSE comparison between the legacy and proposal CE schemes under 480kHz SCS, 30ns DS; [0052] FIG.11A illustrates a diagram of a comb-PT-RS pattern for 32 carrier RBs; [0053] FIG.11B illustrates a diagram of a block-PT-RS pattern for 32 carrier RBs; [0054] FIG.11C illustrates a diagram of a clustered-PT-RS pattern for 32 carrier RBs; [0055] FIG.12 illustrates an example embodiment of a spike power-saving boosting window according to example embodiments disclosed herein; [0056] FIG.13 illustrates a diagram of BLER of different PT-RS patterns with good boosting level vs spike window boosting; [0057] FIG.14 illustrates examples of BLER of different PT-RS patterns with no boosting vs spike window boosting; [0058] FIG.15 illustrates a diagram of legacy DMRS patterns for the 120kHz SCS slot, the 960 kHz SCS multi-slot, and proposed DMRS patterns for the 960 kHz SCS multi-slot; [0059] FIG.16 illustrates a flow diagram of the channel update procedure for multi- PDSCH according to example embodiments disclosed herein; _[0060] FIG.17 illustrates a diagram of BLER of multi-PDSCH with legacy DMRS vs new DMRS pattern under 960kHz SCS; [0061] FIG.18 illustrates a flow diagram of the method with new PT-RS and DMRS patterns implemented by the BS according to example embodiments disclosed herein. [0062] FIG.19 illustrates a flow diagram of the method with new PT-RS and DMRS patterns implemented by the UE according to example embodiments disclosed herein. [0063] FIG.20 illustrates a diagram of an embodiment processing system; and [0064] FIG.21 illustrates a diagram of an embodiment transceiver. [0065] Corresponding numerals and symbols in the different figures generally refer to corresponding parts unless otherwise indicated. The figures are drawn to clearly illustrate the relevant aspects of the embodiments and are not necessarily drawn to scale. DETAILED DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS [0066] The making and using of embodiments of this disclosure are discussed in detail below. It should be appreciated, however, that the concepts disclosed herein can be embodied in a wide variety of specific contexts, and that the specific embodiments discussed herein are merely illustrative and do not serve to limit the scope of the claims. Further, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of this disclosure as defined by the appended claims. [0067] FIG.1 illustrates a network 100 for communicating data. The network 100 comprises a base station 110 having a coverage area 101, a plurality of mobile devices 120, and a backhaul network 130. As shown, the base station 110 establishes uplink (dashed line) and/or downlink (dotted line) connections with the mobile devices 120, which serve to carry data from the mobile devices 120 to the base station 110 and vice-versa. Data carried over the uplink/downlink connections may include data communicated between the mobile devices 120, as well as data communicated to/from a remote-end (not shown) by way of the backhaul network 130. As used herein, the term “base station” refers to any component (or collection of components) configured to provide wireless access to a network, such as an enhanced base station (eNB), a next generation Node B (gNB), a macro-cell, a femtocell, a Wi-Fi access point (AP), or other wirelessly enabled devices. Base stations may provide wireless access in accordance with one or more wireless communication protocols, e.g., long term evolution (LTE), LTE advanced (LTE-A), High Speed Packet Access (HSPA), Wi-Fi 802.11a/b/g/n/ac, etc. As used herein, the term “mobile device” refers to any component (or collection of components) capable of establishing a wireless connection with a base station, such as a user equipment (UE), a mobile station (STA), and other wirelessly enabled devices. In some embodiments, the network 100 may comprise various other wireless devices, such as relays, low power nodes, etc. [0068] In the 52.6-71GHz band, phase noise (PN) is one of the critical impairments which may have a significant impact on bit error rate, and may cause synchronization problems. Without correction of PN, the performance of the network can suffer significant losses. Shown in FIG.2 is a 64-QAM constellation impacted by PN. [0069] As illustrated in FIG.2, it is shown that PN causes common phase error (CPE), which leads to the rotation of the constellation, and a scattering of the constellation points that causes inter-carrier interference (ICI). The CPE is constant in one OFDM symbol because it is an average rotation of the OFDM symbol, while ICI is a phase variation within one OFDM symbol. This limits the maximum SNR at higher frequencies. [0070] For PN estimation and cancellation purposes, the phase tracking reference signal (PT-RS) tones are configured typically to the maximum allowed density on symbols without demodulation reference signal (DMRS) tones in one slot. FIG.3 shows a sample resource grid, where the number of REs of the example resource grid is 48, and the number of OFDM symbols is 14. The DMRS REs are multiplexed with data REs on symbol #2 and symbol #11. The DMRS REs are multiplexed with data REs on symbol #2 and symbol #11, occupying all the odd subcarriers. PT-RS symbols occupy all symbols without DMRS. [0071] PT-RS resource elements (RE) are placed with low density in frequency and high density in time, while DMRS REs are placed with low density in time and high density in frequency. The main purpose of DMRS is channel estimation (CE). We note that PT-RS cannot solely be used without DMRS. The estimated channel with DMRS is a reference for comparing phase rotations from PT-RS CEs in different symbols. Then the receiver compensates all the subcarriers phase rotation (CPE) based on the estimated phase rotation. [0072] At higher frequencies and higher modulations, with severe phase variations, the ICI leads to higher performance degradation. Because the effectiveness of CPE compensation only is limited, a CPE+ICI compensation is necessary. [0073] There is a trade-off between phase tracking accuracy and signaling overhead. If the density of PT-RS and DMRS is high, phase tracking accuracy is high, and CPE+ICI can be better compensated to achieve better performance. However, higher PT-RS density also means larger signaling overhead, which might lead to lower spectrum efficiency or effective transmission rate, i.e., the number of information bits transmitted per second per Hz. [0074] The existing PT-RS patterns are not adequate for achieving satisfactory phase tracking accuracy and enhancing CE at the same time. They do not take advantage of the fact that a better-patterned PT-RS can provide diversity to improve the CE. [0075] The 3GPP NR defines the UE PT-RS reception procedure applicable to a UE receiving PDSCH scheduled by DCI format 1_2 configured with the higher layer parameter, phaseTrackingRS. [0076] PDSCH scheduling is slot-oriented. A UE expects to receive a PDCCH with DCI information that schedules a PDSCH transmission confined in a slot. The time density of PT-RS is scheduled as a function of MCS, while the frequency density is a function of the frequency band. The UE PT-RS transmission procedure described in TS 38.214 applies to a UE PUSCH transmission scheduled by DCI format 0_2 if the higher layer parameter phaseTrackingRS is configured. The UE shall assume the PT-RS antenna ports' presence and pattern are a function of the corresponding scheduled MCS and scheduled bandwidth in a corresponding bandwidth part. [0077] For PUSCH repetition Type B, the PT-RS transmission procedure is applied for each actual repetition separately based on the allocation duration of the actual repetition. When the transmission of PUSCH and PDSCH are short (in time), the PT-RS is not transmitted. [0078] In beyond 52.6GHz, the support of enhancements for multi-PDSCH/PUSCH scheduling is introduced. For multi-PDSCH/PUSCH, a single PDCCH is scheduling transmissions of PDSCH/PUSCH over multiple slots. [0079] For multi-PDSCH, the problem of enhancing RS pattern or RS placement has not been visited by prior releases. By default, legacy DMRS and PT-RS are employed by each slot in the multi-slot for separated CE, then decoding. [0080] The existing PT-RS and DMRS configurations are not adequate for multi- PDSCH/PUSCH scheduling. They do not take advantage of the fact that for higher SCSs, including 480kHz and 960kHz, the channel variation between adjacent slots is much smaller than that of the lower SCS, and therefore, CE of the prior slot(s) can be utilized. _[0081] This disclosure proposes new methods for PT-RS patterns and DMRS allocations suitable for single PDSCH/PUSCH as well for multi-PDSCH/PUSCH scheduling. The proposed method provides CE accuracy improvement and to the enhancement of ICI cancellation. [0082] The proposed embodiments offer more flexible ways of PT-RS and DMRS configurations for the single slot and multi-slot scheduling transmissions. [0083] In the preferred embodiment, the new proposed configuration for PT-RS changes the subcarrier allocation on different OFDM symbols within the PDSCH or PUSCH transmission. For example, the subcarrier (or RE) location in OFDM symbol for PT-RS mapping changes every N symbol, where N can be as low as 1. Thus, after N OFDM symbols the PT-RS signal is transmitted on different frequency resources. Note that the N OFDM symbols may not count the ones with DMRS signals where PT-RS is not mapped. The configuration may be carried in the PDCCH DCI scheduling a PDSCH or PUSCH and may consist of an indicator corresponding to the configuration defined in the specification or set by RRC, that specifies the basic resource allocation unit (frequency and time), the changing pattern (incremental frequency change, frequency hopping, time gap between consecutive PT-RS transmissions), the time and frequency offset of the first allocation. [0084] The PT-RS configuration, details provided in the next section, may be specified for a single slot or multi-slot transmissions. [0085] In one embodiment the changing pattern may be related to DMRS pattern or presence. Both DMRS and PT-RS configurations are tied together in a single table or formula. For example, DMRS and PT-RS are jointly allocated or configured. For instance, PT-RS RE (resource element) allocations are shifted in frequency such that the PT-RS REs across slot(s) occupy more sub-carrier locations. Ideally as many subcarrier indices as possible is desired to provide CE diversity together with the DMRS tones. However, in the case that the number of OFDM symbols for PDSCH or PUSCH transmission excluding that of DMRS is relatively small, PT-RS REs across all the PT-RS symbols may cover a subset of subcarriers. In such a case, the frequency shifting/staggering step size (in united of subcarrier) may be larger than 1. For example, the RE location shifts in frequency in step size of 2, 3, or 4 REs from symbol to symbol. [0086] In a different embodiment the PT-RS transmitted power is not uniform along the frequency or time. For instance, in case of a block PT-RS the edge carrier may have less power than inner block carriers. The power boosting may be based on the basic unit allocation. In unlicensed spectrum when other transmissions (rate matched) are interleaved with the RS signal, the power may be limited by the total power limit. In that case the power boosting may be specified relative to the total transmit power. [0087] The proposed new PT-RS power-boosting provides non-uniform tone power along the frequency for more efficient ICI cancellation. In a different embodiment, the power may change with respect to time. The power boosting may be based on the basic unit allocation. [0088] In a different embodiment, the DMRS configuration may be specified as non- uniform in time. For example, the DMRS distribution is different from slot to slot. [0089] The proposed new DMRS configuration is specified for the multi-slot transmission. For multi-slot transmissions of PDSCH (or PUSCH), a single DCI is used to schedule PDSCH (or PUSCH) in multiple slots, as shown in FIG.4. PDSCH (or PUSCH) in different slots is of separate transmission blocks (TBs). The number of slots for PDSCH (or PUSCH) transmission can be indicated by DCI or by RRC configuration or by combination of both. In one embodiment, the first slot is allocated with more DMRS symbols that the following slots have less DMRS symbol(s) (for example, one DMRS symbol each for the CE to be combined with the earlier slots). [0090] In a different embodiment, the DMRS distribution in consecutive slots depends on the beam changes as well. For instance, in a multi-slot PDSCH scheduling with a single DCI, those PDSCH slots transmitted before timeDurationForQCL may be transmitted with a default TCI (for example, the TCI of the CORESET with lowest index), and those PDSCH transmissions after timeDurationForQCL are transmitted with TCI indicated in the scheduling DCI in the PDCCH, which may be different from the default TCI. [0091] In this case, the DMRS patterns or configurations in the last PDSCH slot before timeDurationForQCL and the first PDSCH slot after timeDurationForQCL are different while the DMRS distribution (configuration) for the first PDSCH slots before and after timeDurationForQCL may be the same. [0092] With the proposed solution, the DMRS and PT-RS may be seen as a joint design of a single flexible RS allocation, where the RS configuration is optimized to the channel characteristics, PN and duration of transmission (single slot, multi-slot, number of symbols). Thus, this flexible RS may be used for CE and PN compensation while minimizing the overhead. [0093] In the rest of the document, examples of the embodiments and the performance results are provided. New PT-RS Pattern [0094] An advantage of using PT-RS for CE for the beyond 52.6GHz link is that PT- RS is configured to occupy more symbols such that time diversity is possible so that the negative effects, such as phase incoherence due to high PN level, is compensated through combining with DMRS. [0095] The legacy PT-RS patterns were designed for ICI cancellation purposes solely, and they do not offer a good subcarrier coverage to be useful for CE. It is only beneficial if the PT-RS tones across all symbols can occupy as many as the subcarrier indices, similar to the DMRS tones. In other words, the overall PT-RS tones across all symbols serve as a ‘virtual DMRS’ that provides diversity. The proposed method provides each PT-RS symbol with different frequency shifts in order that as many subcarriers as possible are covered. [0096] An example of the proposed new PT-RS pattern capable of providing CE diversity gain is shown in FIG.5. The number of REs of the example resource grid is 48 and the number of OFDM symbols is 14. The DMRS REs are multiplexed with data REs on symbol #2 and symbol #11, occupying all the odd-numbered subcarriers. In this example, PT-RS is present in all symbols without DMRS, and each symbol has the same number of tones as that of the legacy PT-RS that has one tone in every two RBs. Different from the legacy pattern, the PT-RS tones of each symbol are orderly shifted to occupy different subcarriers, and as an example, the odd-numbered subcarriers, such that the associated CE can be combined with the 2 DMRS symbols, which also occupy the odd- numbered subcarriers. This provides additional information on the odd-numbered subcarriers in order to improve the associated CE by time diversity. It is also easy to show that the embodiment is applicable to PT-RS on even-numbered subcarriers if the DMRS symbols occupy even-numbered subcarriers. Note that in the case that the number of OFDM symbols for PDSCH/PUSCH is relatively small, even with frequency shifted subcarrier mapping of PT-RS, PT-RS may not occupy all the subcarriers occupied by DMRS. As an alternative, PT-RS can occupy even-numbered subcarriers while DMRS occupies odd-numbered subcarriers or vice versa. [0097] The pattern shown in FIG.5 is a special case under the following general description of subcarriers to which the new PT-RS patterns shall be mapped to:

[0098] It is noted that all new PT-RS patterns that fit into the above general description are examples of alternative embodiments of our solutions. [0099] The link-level simulation parameters used to generate the simulation results are included at the top of each of the figures showing the performance comparisons. The CE procedure enhanced by combining DMRS with the new PT-RS pattern is shown in FIG.6. The link performance using the new method is compared with performances using the Rel 15/16 legacy DMRS and the DMRS staggering, which is one method to avoid frequency interpolation. [0100] The BLER and MSE comparisons using the Rel 15/16 legacy DMRS pattern, the DMRS staggering pattern, and the new PT-RS pattern combined with DMRS, under the larger SCS with larger DS combination are included in FIG.7 – FIG.10. It is seen that for both the 960kHz SCS and 480kHz SCS cases, the proposed CE with the PT-RS utilized for both purposes leads to the best BLER performance and best MSE. The CE with the non-interpolation based DMRS staggering has a better MSE than the legacy CE while worse than the proposed PT-RS staggering pattern, and it is observed that the MSE with DMRS staggering does not always translate into BLER gains, while the BLER gain of the new PT-RS pattern is more stable. [0101] It is noted that the concatenation of the CE procedure with the introduced ICI cancellation block using LS-based FD convolution is one embodiment that the system takes advantage of the CE MSE gain towards better BLER. Other embodiments include different ICI cancellation blocks based on various criteria that could equivalently or better transfer the MSE gains into the BLER gains. [0102] In the case of multi-layer transmission, the current NR design specifies the transmission of PT-RS in only one of the layers since the ICI operation can be performed across layers according to PT-RS carried in only one layer. When the PT-RS is also utilized for channel estimation, single-layered PT-RS transmission is obviously not enough since the layers without PT-RS cannot benefit from this type of channel estimation boost because the lack of PT-RS presence. One solution is to transmit multi- layer PT-RS in the PT-RS tones in the same way as data transmission. Channel estimation in each layer could benefit from its same layer PT-RS. To boost ICI and channel estimation performance, we can also consider increase the density of PT-RS tones such that each tone still carries single-layered PT-RS, and PT-RS belonging to different layers are staggered on the different subcarriers in the same OFDM symbol. This single-layered PT-RS staggering can also be done in existing PT-RS tones without increase of its tone density to reduce overhead. For example, same overall PT-RS density in frequency is maintained and, in the case of 2 layer PDSCH/PUSCH transmission, every other PT-RS REs is used for one layer PT-S associated with one DMRS port by QCL-ed relationship, that is Quasi collocated with the corresponding DMRS port. In this case, the total PT-RS tones available for ICI remains the same while the tones for channel estimation of each layer are reduced by a factor of the number of transmitted layers. Another staggering variation is to stagger different-layer PT-RS in the time domain. PT- RS REs of each layer which associated with a DMRS port by QCL-ed relationship are transmitted in the OFDM symbol the same way as single-layered PT-RS while different layers are staggered in different OFDM symbols. PT-RS Non-uniform Power Boosting [0103] Three types of PT-RS patterns, including the legacy comb-PT-RS, block-PT- RS, and cluster-PT-RS (equivalently multi-block PT-RS) are shown in FIG.11A – FIG. 11C. In general, the legacy comb-PT-RS performs adequately, although techniques such as power-boosting are not addressed. It is beneficial for the UE to support all the three PT-RS patterns. The pattern to use for recovering the PDSCH is determined based on the MCS and subcarrier spacing, and is signaled to the UE. For NR-U 52.6 to 71GHz, it is known that the lower SCS suffers more from ICI, and the lower MCS suffers less from ICI. Therefore, the legacy comb-PT-RS is considered sufficiently competent for links with higher SCS and/or with lower MCS. Block-PT-RS is useful under higher SCS and larger MCS to alleviate ICI on data subcarriers, and the proposed clustered-PT-RS below with power-saving windowing is useful if further performance gain over block-PT-RS is required. [0104] The power-boosting used for the legacy-PT-RS is conventionally uniform, i.e., all the PT-RS tones are multiplied with a constant power-boosting factor, although even uniform power-boosting for the block-PT-RS or clustered-PT-RS had not been considered. Through evaluations of uniform power-boosting to the three PT-RS structures, the following insights are discovered to facilitate us to disclose an appropriate non-uniform power-boosting procedure that can outperform uniform boosting in terms of BLER with minimal boosting power: a. Providing extra power for every tone can be power consuming; b. Comb-PT-RS is more scattered over frequency, thus may capture better global information for ICI estimation/cancellation; c. Comb-PT-RS has more ICI on adjacent data subcarriers, thus has low opportunity to enjoy the benefit from power-boosting; d. Block-PT-RS is the least scattered over frequency, thus captures rather local information over frequency; e. Block-PT-RS has fewer neighboring data subcarriers, thus lower ICI on data, and in turn, higher opportunity to benefit from power-boosting; f. Clustered-PT-RS has a tradeoff between frequency scattering and level of ICI on data subcarriers, so it might be a good candidate for certain power- boosting to be embedded. g. The PT-RS tones near the middle of a cluster have less interference with data subcarriers than the border tones; h. The PT-RS tones are relatively more robust to ICI from neighbors than data subcarriers since lower-order modulation such as QPSK is typically used for PT-RS. [0105] The spike window, as shown in FIG.12, is the proposed non-uniform power- boosting window that achieves better performance and saves power. The spike window boosts only the middle tones of each PT-RS cluster of each symbol by 7dB, which is the 8th tone for the considered case with eight PT-RS clusters for each OFDM symbol and 16 tones in each cluster. The performance comparisons between different PT-RS patterns with the power-saving boosting are included in FIG.13 and FIG.14. For this enhancement, the cluster size should be made an additional configurable parameter by the RRC. The spike window, although it saves power comparing to the uniform windows, does have restrictions in more power-stringent scenarios. To power boost PT-RS, one may have to take power from REs for PDSCH/PUSCH to make the power constant. Reducing power of data REs may degrade the performance. One alternative embodiment to alleviate the potential issue is to suppress the border tones of PT-RS and use the saved power instead to boost the middle tone, such that the total power of the data REs is not changed. Other embodiments include different windows that reduces power of the border tones and increases the power of the middle tone(s) such that the total power of the PT-RS tones is not changed, and in turn, the power of data subcarriers does not need to be downscaled. These types of embodiments are transparent to UE, i.e., the UE does not need to be informed of whether windowing functions are enabled at the gNB in order to do the ICI cancellation and data decoding. On the contrary, implementation of the spike window is not transparent to the UE and needs to be indicated to the UE if the power of the data carriers is scaled accordingly for a constant power. [0106] This solution of better ICI compensation using non-uniformly boosted clustered-PT-RS can also fit into the framework of dual-purpose reference signal if appropriate new patterns through allocation of the clusters in each symbol such that the tones across a slot occupy as many subcarriers as possible, which is an additional embodiment that the gNB configures dual-purpose tones that may enhance CE accuracy. DMRS Allocations for Multi-PDSCH/PUSCH [0107] The slot duration associated with the higher SCSs, especially 960kHz SCS, is much shorter than that of the lower SCSs, and therefore less channel variation across multiple slots is expected. In the meantime, for a multi-PDSCH with SCS 960kHz as shown in FIG.15, finer granularity is available such that the DMRS symbols can be jointly reallocated across different symbols on multiple slots. Here, for multi- PDSCH/PUSCH (i.e. multi-slot transmissions of PDSCH (or PUSCH)), a single DCI is used to schedule PDSCH (or PUSCH) in multiple slots. PDSCH (or PUSCH) in different slots is of separate transmission blocks (TBs). The number of slots for PDSCH (or PUSCH) transmission can be indicated by DCI or by RRC configuration or by combination of both. [0108] Multiple example patterns are shown in FIG.15. Pattern 1 maintains the same overhead with the legacy DMRS, i.e., 16 symbols across the 8 slots, and we propose to allocate most of the DMRS symbols in the first slot, and 1 symbol DMRS for the following slots. Other embodiments include that the number of DMRS symbols of the first PDSCH/PUSCH slot and the number of DMRS symbol(s) (including no DMRS symbol) of the rest PDSCH/PUSCH can be configured/indicated in a more flexible manner without having to maintain the overhead. Pattern 2 shows the embodiment with which there are two multi-slots with size 4, and the first slot of both multi-slots uses more DMRS symbols than the rest. Pattern 2 is particularly useful when the different transmission beams are applied within different slots of the multi-slot transmission. In the case of multi-PDSCH in multiple slots scheduled by a single DCI, TCI is indicated by the DCI to dynamically indicate transmission beam via QCL Type-D relationship. Due to PDCCH decoding time and beam switching time, the indicated beam takes some time to become effective. For instance, in a multi-slot PDSCH scheduling with a single DCI, those PDSCH slots start transmitting before timeDurationForQCL after the scheduling DCI may be transmitted with a default TCI (for example, the TCI of the CORESET with lowest index), and those PDSCH transmissions after timeDurationForQCL are transmitted with TCI indicated in the scheduling DCI in the PDCCH, which may be different from the default TCI. Once the transmission beam is changed, high-density DMRS symbol transmission is needed in the first slot to recalculate the channel estimation. Note that the number of DMRS symbols and their pattern in time for the first slots (or the rest of the slots) of the set of slots with different transmission beams need not to be the same. Pattern 3 shows the embodiment with a different DMRS time allocation/density, where 6 DMRS symbols are associated with the slot 1 and 2 DMRS symbols for the rest of the slots. Alternative embodiments include those which assign most of DMRS symbols onto the first slot and less DMRS symbols onto the following slots for an enhanced CE. The size of multi-slot is configurable. Pattern 4 shows a case of the multi-slot size of 4 and how the DMRS symbols are allocated for each slot. Pattern 5 shows a case of the multi-slot size of 2 and the associated DMRS allocations. These embodiments are that for N slots, there are KN total DMRS. Assuming 1 DMRS for N-1 slots , then there are (K-1)N +1 DMRS for the first slot. Another variation is for N slots, there are KN total DMRS. Assuming 2 DMRS for N-1 slots, then there are (K-2)N +2 DMRS for the first slot. In more general embodiments, the number of DMRS symbols of the first PDSCH/PUSCH slot and the number of DMRS symbol(s) (including no DMRS symbol) of the rest PDSCH/PUSCH can be configured/indicated in a more flexible manner. [0109] The multi-slot CE procedure corresponding to Pattern 1 is summarized in FIG.16. After obtaining the CE of the first slot using 9 DMRS symbols (step 1602), it is buffered for a weighted sum when CE of the second slot is available. The buffered CE is updated each time the weighted sum is done (step 1603), until the end of the multi-slot (step 1604). FIG.17 shows the BLER gain of the proposed new DMRS TD pattern over the legacy pattern for one case with a delay spread 10ns. [0110] It is noted that for the proposed new DMRS TD pattern, each OFDM symbol would have at least one DMRS symbol to be efficiently combined with the latest update in the buffer, and no slot would need to wait for the CE to be available for the following slots for further combination. This processing order avoids the necessity to buffer an excessive amount of undecoded symbols in the buffer, considering the UE processing timeline for NR-U 52.6 to 71GHz, where the complexity grows exponentially with the SCS. RS Enhancements for Multi-PDSCH/PUSCH [0111] The evaluated case with the new DMRS TD pattern for multi- PDSCH/PUSCH adopts legacy DMRS and PT-RS patterns, i.e., each RS only serves its default duty. While it is noted that utilization of the dual-purpose RS as described in the previous sections should not be precluded for the multi-PDSCH category. For example, in pattern 1 of FIG.15, in the first slot of the multi-slot, only four PT-RS symbols are available, thus is not expected to occupy all the subcarrier that DMRS occupies. For each of the second to the last slot, PT-RS is enabled on 13 symbols, and by applying the new PT-RS staggering pattern, the PT-RS can occupy all the subcarriers as with the DMRS and be utilized to increase CE accuracy for the multi-PDSCH. Embodiments include integrating the new PT-RS staggering pattern for CE improvement with one or multiple of the slots in the multi-slot. As an embodiment, with PT-RS staggering pattern, zero DMRS symbol may be used in the slots following the first slot for multi-slot PDSCH/PUSCH. [0112] Likewise, the power-saving boosting is also a viable candidate for the multi- PDSCH transmission. The network can configure legacy-PT-RS, block-PT-RS, and clustered-PT-RS with appropriate staggering patterns to occupy as many subcarriers as possible for further CE accuracy improvement for multi-PDSCH similar to the single PDSCH, which belong to different embodiments of the technical invention. PT-RS [0113] The configuration of PT-RS may be indicated in the PDCCH DCI scheduling a PDSCH or PUSCH indicating a codebook or a table entry which specifies the basic resource allocation unit (frequency and time), the changing pattern (incremental frequency change, frequency hopping, time gap between consecutive PT-RS transmissions), the time and frequency offset of the first allocation. The basic allocation unit for PT-RS may consist of a set of subcarriers (block PT-RS unit), where the set of subcarriers may be contiguous or sparse. PTRS-DownlinkConfig ::= SEQUENCE { frequencyDensity SEQUENCE (SIZE (N)) OF INTEGER

[0114] For PT-RS, we define additional entries in the configuration table frequencyDensity and timeDensity, frequencyShift and the power-Boost-Ratio to indicate for a single symbol the power ratio between central and edge PT-RS subcarriers for block frequency density (adjacent subcarriers). DMRS [0115] To enable new time domain patterns, including the proposed ones, the DMRS-DownlinkConfig information element with the RRC requires necessary extensions. The dmrs-AdditionalPosition as shown in section 3.1 by the DMRS- DownlinkConfig field descriptions allows ENUMERATED {pos0, pos1, pos3}, i.e., zero, one, or three additional positions for DMRS in one slot, which is not enough for the new TD pattern for the multi-PDSCH. [0116] The field maxLength, the maximum number of OFDM symbols for DL front- loaded DMRS is currently restricted by ENUMERATED {len2}, i.e., 2 symbols for FL DMRS, while for the multi-PDSCH this constraint should also be relaxed to allow more flexibility for possible TD DMRS patterns. Considering that the network should be allowed to turn these additional DMRS patterns on and off for multi-PDSCH, it can be convenient to add such a new field of 1 bit to the RRC table that indicates. A PDSCH/PUSCH DMRS pattern table that contains the proposed patterns, among other potential new patterns can be established to be configurable. A new field that contains limited choices of the channel forgetting factor carried by no more than 2 bits can be introduced to the DMRS-DownlinkConfig fields.

[0117] The representations of the method with the proposed new PT-RS and DMRS patterns at the gNB and UE sides are included in FIG.18 and FIG.19. [0118] A method to configure new PT-RS patterns and DMRS allocations to improve CE accuracy and ICI cancellation, and thus the link performance of beyond 52.6GHz link was described herein. The technical detail of such enhancements and the corresponding signaling to enable them are provided for both the single PDSCH/PUSCH and the multi- PDSCH/PUSCH. [0119] FIG.20 illustrates a block diagram of an embodiment processing system 2000 for performing methods described herein, which may be installed in a host device. As shown, the processing system 2000 includes a processor 2004, a memory 2006, and interfaces 2010-2014, which may (or may not) be arranged as shown in FIG.20. The processor 2004 may be any component or collection of components adapted to perform computations and/or other processing related tasks, and the memory 2006 may be any component or collection of components adapted to store programming and/or instructions for execution by the processor 2004. In an embodiment, the memory 2006 includes a non-transitory computer readable medium. The interfaces 2010, 2012, 2014 may be any component or collection of components that allow the processing system 2000 to communicate with other devices/components and/or a user. For example, one or more of the interfaces 2010, 2012, 2014 may be adapted to communicate data, control, or management messages from the processor 2004 to applications installed on the host device and/or a remote device. As another example, one or more of the interfaces 2010, 2012, 2014 may be adapted to allow a user or user device (e.g., personal computer (PC), etc.) to interact/communicate with the processing system 2000. The processing system 2000 may include additional components not depicted in FIG.20, such as long term storage (e.g., non-volatile memory, etc.). [0120] In some embodiments, the processing system 2000 is included in a network device that is accessing, or part otherwise of, a telecommunications network. In one example, the processing system 2000 is in a network-side device in a wireless or wireline telecommunications network, such as a base station, a relay station, a scheduler, a controller, a gateway, a router, an applications server, or any other device in the telecommunications network. In other embodiments, the processing system 2000 is in a user-side device accessing a wireless or wireline telecommunications network, such as a mobile station, a user equipment (UE), a personal computer (PC), a tablet, a wearable communications device (e.g., a smartwatch, etc.), or any other device adapted to access a telecommunications network. [0121] In some embodiments, one or more of the interfaces 2010, 2012, 2014 connects the processing system 2000 to a transceiver adapted to transmit and receive signaling over the telecommunications network. FIG.21 illustrates a block diagram of a transceiver 2100 adapted to transmit and receive signaling over a telecommunications network. The transceiver 2100 may be installed in a host device. As shown, the transceiver 2100 comprises a network-side interface 2102, a coupler 2104, a transmitter 2106, a receiver 2108, a signal processor 2110, and a device-side interface 2112. The network-side interface 2102 may include any component or collection of components adapted to transmit or receive signaling over a wireless or wireline telecommunications network. The coupler 2104 may include any component or collection of components adapted to facilitate bi-directional communication over the network-side interface 2102. The transmitter 2106 may include any component or collection of components (e.g., up- converter, power amplifier, etc.) adapted to convert a baseband signal into a modulated carrier signal suitable for transmission over the network-side interface 2102. The receiver 2108 may include any component or collection of components (e.g., down-converter, low noise amplifier, etc.) adapted to convert a carrier signal received over the network-side interface 2102 into a baseband signal. The signal processor 2110 may include any component or collection of components adapted to convert a baseband signal into a data signal suitable for communication over the device-side interface(s) 2112, or vice-versa. The device-side interface(s) 2112 may include any component or collection of components adapted to communicate data-signals between the signal processor 2110 and components within the host device (e.g., the processing system 2000, local area network (LAN) ports, etc.). [0122] The transceiver 2100 may transmit and receive signaling over any type of communications medium. In some embodiments, the transceiver 2100 transmits and receives signaling over a wireless medium. For example, the transceiver 2100 may be a wireless transceiver adapted to communicate in accordance with a wireless telecommunications protocol, such as a cellular protocol (e.g., long-term evolution (LTE), etc.), a wireless local area network (WLAN) protocol (e.g., Wi-Fi, etc.), or any other type of wireless protocol (e.g., Bluetooth, near field communication (NFC), etc.). In such embodiments, the network-side interface 2102 comprises one or more antenna/radiating elements. For example, the network-side interface 2102 may include a single antenna, multiple separate antennas, or a multi-antenna array configured for multi-layer communication, e.g., single input multiple output (SIMO), multiple input single output (MISO), multiple input multiple output (MIMO), etc. In other embodiments, the transceiver 2100 transmits and receives signaling over a wireline medium, e.g., twisted-pair cable, coaxial cable, optical fiber, etc. Specific processing systems and/or transceivers may utilize all of the components shown, or only a subset of the components, and levels of integration may vary from device to device. [0123] It should be appreciated that one or more steps of the embodiment methods provided herein may be performed by corresponding units or modules. For example, a signal may be transmitted by a transmitting unit or a transmitting module. A signal may be received by a receiving unit or a receiving module. A signal may be processed by a processing unit or a processing module. The respective units/modules may be hardware, software, or a combination thereof. For instance, one or more of the units/modules may be an integrated circuit, such as field programmable gate arrays (FPGAs) or application- specific integrated circuits (ASICs). [0124] Although the description has been described in detail, it should be understood that various changes, substitutions and alterations can be made without departing from the spirit and scope of this disclosure as defined by the appended claims. Moreover, the scope of the disclosure is not intended to be limited to the particular embodiments described herein, as one of ordinary skill in the art will readily appreciate from this disclosure that processes, machines, manufacture, compositions of matter, means, methods, or steps, presently existing or later to be developed, may perform substantially the same function or achieve substantially the same result as the corresponding embodiments described herein. Accordingly, the appended claims are intended to include within their scope such processes, machines, manufacture, compositions of matter, means, methods, or steps. [0125] While this disclosure has been described with reference to illustrative embodiments, this description is not intended to be construed in a limiting sense. Various modifications and combinations of the illustrative embodiments, as well as other embodiments of the disclosure, will be apparent to persons skilled in the art upon reference to the description. It is therefore intended that the appended claims encompass any such modifications or embodiments.

Claims

WHAT IS CLAIMED: 1. A method of wireless communication, comprising: configuring, by a next generation Node B (gNB), a user equipment (UE) with radio resource control (RRC) parameters; selecting, by the gNB, a pattern of signal allocation and distribution in time, frequency, and space, the pattern indicating orthogonal frequency division multiplexing (OFDM) symbol tones and subcarrier of a reference signal (RS); transmitting, by the gNB to the UE, downlink control information (DCI) indicating the selected pattern; and transmitting, by the gNB, at least one or more phase tracking reference signal (PT-RS) and demodulation reference signal (DMRS) in accordance with the RRC parameters and selected pattern.

2. The method of claim 1 wherein the pattern is in accordance with the PT-RS tones of each symbol to occupy the odd-numbered subcarriers, such that the associated channel estimation (CE) is combined with DMRS symbols, the DMRS symbols also occupying the odd-numbered subcarriers.

3. The method of claim 1 wherein the pattern is in accordance with the PT-RS being present in all symbols without DMRS.

4. The method of claim 1 wherein the pattern is in accordance with a single-layered PT-RS, staggering PT-RS density in frequency domain and wherein every other PT-RS resource element (RE) is used for one layer PT-RS associated with one DMRS port by QCL-ed relationship that is Quasi collocated with the corresponding DMRS port.

5. The method of claim 1 wherein the pattern is in accordance with staggering different-layer PT-RS in the time domain, the PT-RS resource elements (REs) of each layer being a quasi-co-located (QCL-ed) with a DMRS port, and the different-layers being staggered in different OFDM symbols.

6. A method of wireless communication, comprising: receiving, by a user equipment (UE), radio resource control (RRC) parameters; decoding, by the UE, an indicator field, the indicator field indicating if new patterns are transmitted; performing, by the UE, channel estimation (CE) and inter-carrier interference (ICI) cancellation in accordance with the new transmitted patterns; and signaling, by the UE, messaging in accordance with the CE and ICI cancellation.

7. The method of claim 6 wherein the new patterns are in accordance with the phase tracking reference signal (PT-RS) tones of each symbol to occupy the odd-numbered subcarriers, such that the associated channel estimation (CE) is combined with demodulation reference signal (DMRS) symbols, the DMRS symbols also occupying the odd-numbered subcarriers.

8. The method of claim 6 wherein the new patterns are in accordance with the phase tracking reference signal (PT-RS) being present in all symbols without demodulation reference signal (DMRS).

9. The method of claim 6 wherein the new patterns are in accordance with a single- layered PT-RS, staggering PT-RS density in frequency domain and wherein every other PT-RS resource element (RE) is used for one layer PT-S associated with one demodulation reference signal (DMRS)port by QCL-ed relationship, that is Quasi collocated with the corresponding DMRS port.

10. The method of claim 6 wherein the new pattern is in accordance with staggering different-layer PT-RS in the time domain, the PT-RS resource elements (REs) of each layer being a quasi-co-located (QCL-ed) with a demodulation reference signal (DMRS) port, and the different-layers being staggered in different OFDM symbols.

11. A method of wireless communication, comprising: obtaining, by a user equipment (UE), radio resource control (RRC) parameters and downlink control information (DCI) for scheduling; decoding, by the UE, the DCI indicating a selected pattern; receiving, by the UE, phase tracking reference signal (PT-RS) and demodulation reference signal (DMRS) in accordance with the RRC parameters and the selected pattern; and transmitting, by the UE, signaling in accordance with a reference signal (RS) based on the DCI indication to compensate the phase noise (PN), and further in accordance with an iterative or simultaneous channel estimation (CE).

12. A method of wireless communication, comprising: providing, by a next generation Node B (gNB) to a user equipment (UE), at least one of a flexible phase tracking reference signal (PT-RS) or demodulation reference signal (DMRS) configurations for single slot and multi-slot scheduling transmissions; and communicating, by the gNB to the UE, using at least one of the flexible phase tracking reference signal (PT-RS) or demodulation reference signal (DMRS) configurations for the single slot and multi-slot scheduling transmissions.

13. The method of claim 12, wherein the configuration for PT-RS changes the subcarrier allocation on different orthogonal frequency division multiplexing (OFDM) symbols within a PDSCH or PUSCH transmission.

14. The method of claim 13, wherein the subcarrier or resource element (RE) location in OFDM symbol for PT-RS mapping changes every N symbol, where N is an integer which is at least 1.

15. A method of multi-slot transmissions of physical downlink shared channel (PDSCH) or physical uplink shared channel (PUSCH), comprising: transmitting, by a device, a single downlink control information (DCI) to schedule PDSCH or PUSCH transmissions in multiple slots; and transmitting, by the device, a plurality of messages in different slots in at least two transmission blocks (TBs), wherein the number of slots for the message transmission is indicated by downlink control information (DCI), radio resource control (RRC) parameters, or by a combination of both.

16. The method of claim 15, wherein the first slot is allocated with more demodulated reference signal (DMRS) symbols than the subsequent slots of the PDSCH or PUSCH transmissions scheduled with a single DCI.

17. The method of claim 16, wherein the number of DMRS symbols being allocated is non-uniform in the sequence of PDSCH or PUSCH scheduled with the same DCI.

18. The method of claim 16, wherein the number of DMRS symbols being allocated is decreasing in time.

19. A next generation Node B (gNB) comprising: a non-transitory memory storage comprising instructions; and one or more processors in communication with the memory storage, the one or more processors executing the instructions to: configure a user equipment (UE) with radio resource control (RRC) parameters; select a pattern of signal allocation and distribution in time, frequency, and space, the pattern indicating orthogonal frequency division multiplexing (OFDM) symbol tones and subcarrier of a reference signal (RS); transmit downlink control information (DCI) indicating the selected pattern; and transmit at least one or more phase tracking reference signal (PT-RS) and demodulation reference signal (DMRS) in accordance with the RRC parameters and selected pattern.

20. The gNB of claim 19 wherein the pattern is in accordance with the PT-RS tones of each symbol to occupy the odd-numbered subcarriers, such that the associated channel estimation (CE) is combined with DMRS symbols, the DMRS symbols also occupying the odd-numbered subcarriers.

21. The gNB of claim 19 wherein the pattern is in accordance with the PT-RS being present in all symbols without DMRS.

22. The gNB of claim 19 wherein the pattern is in accordance with a single-layered PT-RS, staggering PT-RS density in frequency domain and, wherein every other PT-RS resource element (RE) is used for one layer PT-S associated with one DMRS port by QCL-ed relationship, that is Quasi collocated with the corresponding DMRS port.

23. The gNB of claim 19 wherein the pattern is in accordance with staggering different-layer PT-RS in the time domain, the PT-RS resource elements (REs) of each layer being a quasi-co-located (QCL-ed) with a DMRS port, and the different-layers being staggered in different OFDM symbols.

24. A user equipment (UE) comprising: a non-transitory memory storage comprising instructions; and one or more processors in communication with the memory storage, the one or more processors executing the instructions to: receive radio resource control (RRC) parameters; decode an indicator field, the indicator field indicating if new patterns are transmitted; perform channel estimation (CE) and inter-carrier interference (ICI) cancellation in accordance with the new transmitted patterns; and signal messaging in accordance with the CE and ICI cancellation.

25. The UE of claim 24 wherein the new patterns are in accordance with the phase tracking reference signal (PT-RS) tones of each symbol to occupy the odd-numbered subcarriers, such that the associated channel estimation (CE) is combined with demodulation reference signal (DMRS)symbols, the DMRS symbols also occupying the odd-numbered subcarriers.

26. The UE of claim 24 wherein the new patterns are in accordance with the phase tracking reference signal (PT-RS) being present in all symbols without demodulation reference signal (DMRS).

27. The UE of claim 24 wherein the new patterns are in accordance with a single- layered PT-RS, staggering phase tracking reference signal (PT-RS) density in frequency domain and wherein every other PT-RS resource element (RE) is used for one layer PT-S associated with one demodulation reference signal (DMRS)port by QCL-ed relationship, that is Quasi collocated with the corresponding DMRS port.

28. The UE of claim 24 wherein the new patterns are in accordance with staggering different-layer phase tracking reference signal (PT-RS)in the time domain, the PT-RS resource elements (REs) of each layer being a quasi-co-located (QCL-ed) with a demodulation reference signal (DMRS)port, and the different-layers being staggered in different OFDM symbols.

29. A user equipment (UE) comprising: a non-transitory memory storage comprising instructions; and one or more processors in communication with the memory storage, the one or more processors executing the instructions to: obtain radio resource control (RRC) parameters and downlink control information (DCI) for scheduling; decode the DCI indicating a selected pattern; receive phase tracking reference signal (PT-RS) and demodulation reference signal (DMRS) in accordance with the RRC parameters and the selected pattern; and transmit signaling in accordance with a reference signal (RS) based on the DCI indication to compensate the phase noise (PN), and further in accordance with an iterative or simultaneous channel estimation (CE).

30. A next generation Node B (gNB) comprising: a non-transitory memory storage comprising instructions; and one or more processors in communication with the memory storage, the one or more processors executing the instructions to: provide to a user equipment (UE), at least one of a flexible phase tracking reference signal (PT-RS) or demodulation reference signal (DMRS) configurations for single slot and multi-slot scheduling transmissions; and communicate to the UE using at least one of the flexible phase tracking reference signal (PT-RS) or demodulation reference signal (DMRS) configurations for the single slot and multi-slot scheduling transmissions.

31. The gNB of claim 30, wherein the configuration for PT-RS changes the subcarrier allocation on different orthogonal frequency division multiplexing (OFDM) symbols within a PDSCH or PUSCH transmission.

32. The gNB of claim 31, wherein the subcarrier or resource element (RE) location in OFDM symbol for PT-RS mapping changes every N symbol, where N is an integer which is at least 1.

33. A next generation Node B (gNB) comprising: a non-transitory memory storage comprising instructions; and one or more processors in communication with the memory storage, the one or more processors executing the instructions to: transmit a single downlink control information (DCI) to schedule PDSCH or PUSCH transmissions in multiple slots; and transmit a plurality of messages in different slots in at least two transmission blocks (TBs), wherein the number of slots for the message transmission is indicated by downlink control information (DCI), radio resource control (RRC) parameters, or by a combination of both.

34. The gNB of claim 33, wherein the first slot is allocated with more demodulated reference signal (DMRS) symbols than the subsequent slots of the PDSCH or PUSCH transmissions scheduled with a single DCI.

35. The gNB of claim 34, wherein the number of DMRS symbols being allocated is non-uniform in the sequence of PDSCH or PUSCH scheduled with the same DCI.

36. The gNB of claim 34, wherein the number of DMRS symbols being allocated is decreasing in time.