Channel state information reporting for coherent joint transmission calibration
CSI reporting techniques address inter-TRP misalignments in CJT by measuring and reporting delay, frequency, and phase differences, enhancing performance in wireless communication systems.
Patent Information
- Application Number
- PCT/CN2024/086032
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-04-03
- Publication Date
- 2025-10-09
AI Technical Summary
In wireless communication systems with multiple transmitters and receivers, the performance of coherent joint transmission (CJT) is degraded due to inter-TRP delay, frequency, and phase differences, which are not accurately measured and reported, leading to inefficiencies in coverage, capacity, and reliability.
Implementing techniques for channel state information (CSI) reporting that measure and report inter-TRP delay, frequency, and phase differences, enabling network devices to perform pre-compensation and improve CJT performance.
Enhances CJT performance by reducing misalignments, thereby improving coverage, capacity, and reliability in wireless communication systems.
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Figure CN2024086032_09102025_PF_FP_ABST
Abstract
Description
CHANNEL STATE INFORMATION REPORTING FOR COHERENT JOINT TRANSMISSION CALIBRATIONTECHNICAL FIELD
[0001] This present document is directed generally to wireless communications.BACKGROUND
[0002] Mobile communication technologies are moving the world toward an increasingly connected and networked society. The rapid growth of mobile communications and advances in technology have led to greater demand for capacity and connectivity. Other aspects, such as energy consumption, device cost, spectral efficiency, and latency are also important to meeting the needs of various communication scenarios.
[0003] Long-Term Evolution (LTE) is a standard for wireless communication for mobile devices and data terminals developed by 3rd Generation Partnership Project (3GPP) . LTE Advanced (LTE-A) is a wireless communication standard that enhances the LTE standard. The 5th generation of wireless system, known as 5G, advances the LTE and LTE-Awireless standards and is committed to supporting higher data-rates, large number of connections, ultra-low latency, high reliability and other emerging business needs. Various techniques, including new ways to provide higher quality of service, longer battery life, and improved performance are being discussed.SUMMARY
[0004] Techniques are disclosed for channel state information (CSI) reporting to allow coherent joint transmission (CJT) calibration. These techniques may be employed in a network configuration where multiple transmitters and receivers (or transceiver points) are used to enhance the coverage, capacity, or reliability of wireless communication systems.
[0005] In one aspect, a method of wireless communication performed by a wireless device (e.g., a user equipment (UE) ) is disclosed. The method includes: receiving, at a wireless device from a network device, one or more reference signals (RSs) or one or more sets of RSs; determining, by the wireless device, channel state information (CSI) based on the one or more RSs or the one or more sets of RSs, wherein the CSI comprises at least one of delay information corresponding to the one or more RSs or the one or more sets of RSs, frequency information corresponding to the one or more RSs or the one or more sets of RSs, or phase information corresponding to the one or more RSs or the one or more sets of RSs; and transmitting, from the wireless device to the network device, the CSI.
[0006] In another aspect, a method of wireless communication performed by a network device (e.g., a base station (BS) , a network node) is disclosed. The method includes: transmitting, by a network device to a wireless device, one or more reference signals (RSs) or one or more sets of RSs; and receiving, at the network device from the wireless device, channel state information (CSI) determined based on the one or more RSs or the one or more sets of RSs, wherein the CSI comprises at least one of delay information corresponding to the one or more RSs or the one or more sets of RSs, frequency information corresponding to the one or more RSs or the one or more sets of RSs, or phase information corresponding to the one or more RSs or the one or more sets of RSs.
[0007] In yet another exemplary aspect, the above-described methods are embodied in the form of processor-executable code and stored in one or more non-transitory computer-readable storage media. The code included in the computer readable storage media when executed by one or more processors, causes the one or more processors to implement the methods described in this patent document.
[0008] In yet another exemplary embodiment, a wireless communication device that is configured or operable to perform the above-described methods is disclosed. The wireless communication device may be a wireless device (e.g., a wireless device (e.g., a UE) , or a network device (e.g., a BS) .
[0009] The above and other aspects and their implementations are described in greater detail in the drawings, the descriptions, and the claims.
[0010] BRIEF DESCRIPTION OF THE DRAWING
[0011] Figure 1A shows an example of coherent joint transmission (CJT) in accordance with some embodiments of the disclosed technology.
[0012] Figure 1B shows an example of a wireless communication system in accordance with some embodiments of the disclosed technology.
[0013] Figure 2 is a block diagram representation of a portion of an apparatus in accordance with some embodiments of the disclosed technology.
[0014] Figure 3 shows a flowchart of an example method of wireless communication in accordance with some embodiments of the disclosed technology.
[0015] Figure 4 shows a flowchart of an example method of wireless communication in accordance with some embodiments of the disclosed technology.DETAILED DESCRIPTION
[0016] The example headings for the various sections below are used to facilitate the understanding of the disclosed subject matter and do not limit the scope of the claimed subject matter in any way. Accordingly, one or more features of one example section can be combined with one or more features of another example section. Furthermore, 5G terminology is used for the sake of clarity of explanation, but the techniques disclosed in the present document are not limited to 5G technology only, and may be used in wireless systems that implemented other protocols.
[0017] The new radio (NR) technology of fifth generation (5G) mobile communication systems is continuously improved to provide higher quality wireless communication. In a multiple-input-multiple-output (MIMO) communication system operated in frequency-division-duplexing (FDD) mode, typically a wireless device (e.g., a UE) may measure downlink (DL) channel state information (CSI) through a DL reference signal (RS) and feed back the CSI to a network device (e.g., a BS) . The CSI can include at least one of: a CSI-RS resource indicator (CRI) , a rank indicator (RI) , a layer indicator (LI) , a precoding matrix indicator (PMI) , or a channel quality indicator (CQI) . Among these CSI quantities, PMI may reflect the DL channel response and cost a highest reporting overhead. Typically, PMI reporting may be based on a predefined codebook.
[0018] In wireless communication, multiple Transmission and Reception Point (m-TRP) Coherent Joint Transmission (CJT) may improve DL throughput for edged UE. Figure 1A shows an example of CJT where an edged UE is served by two TRPs. For example, in FDD mode, the frequency and delay of the signals transmitted from multiple (e.g., two or more) TRPs can be different. Consequently, the CJT performance may be degraded. As another example, in TDD mode, the channel may be measured via spread spectrum (SS) based on a reciprocity assumption. However, the DL / UL phase and timing difference can be different across different TRPs, and accordingly the reciprocity assumption can fail to hold. This may also lead to performance degradation of CJT.
[0019] To address these and other issues, the inter-TRP delay / frequency / phase difference may be measured and reported. Then a network device (e.g., gNB) can perform inter-TRP pre-compensation to reduce or eliminate the delay / frequency / phase misalignment. The present document includes descriptions regarding reporting format of inter-TRP phase differences, uplink control information (UCI) design for multiplexing inter-TRP delay / frequency / phase differences, CSI processing unit (CPU) occupation, and a time line restriction for the CSI reporting by the wireless device reflected by Z / Z’.
[0020] As used herein, “UE” can include or be equivalent to a wireless device, or referred to as a wireless communication device.
[0021] As used herein, “BS” can include or be equivalent to a next Generation Node B (gNB) , a wireless network device, or a transmission and reception point (TRP) .
[0022] As used herein, an “antenna port” can include or be equivalent to a BS antenna port, or a CSI-RS antenna port.
[0023] As used herein, a “time unit” can include or be equivalent to a sub-symbol, a symbol, a slot, a sub-frame, a frame, or a transmission occasion.
[0024] As used herein, a “higher layer parameter” can include or be equivalent to a radio resource control (RRC) parameter, a radio resource management (RRM) parameter, a radio resource arrangement (RRA) parameter, downlink control information (DCI) , or a physical downlink control channel (PDCCH) parameter.
[0025] As used herein, a “delay offset” can include or be equivalent to a delay, a delay shift, a delay difference, a time, a time offset, a time shift, a time difference, timing, a timing offset, aa timing shift, or a timing difference.
[0026] As used herein, a “frequency offset” can include or be equivalent to a frequency, a frequency difference, a frequency shift, a carrier frequency offset (CFO) , or an CFO offset, a CFO difference, or a CFO shift.
[0027] As used herein, a “phase offset” can include or be equivalent to a phase, a phase shift, a phase difference, a phase rotation, or a phase change.
[0028] As used herein, a “subband width” can include or be equivalent to a frequency unit, a frequency band, a frequency range, or a frequency distance.
[0029] As used herein, the frequency domain (FD) basis corresponding to can be defined as
[0030] where and N3 is the number (or referred to as subband count) of subbands, is the FD basis index.
[0031] Figure 1A shows an example of CJT in accordance with some embodiments of the disclosed technology. As illustrated, an edged UE (e.g., UE 111, 112, or 113 as illustrated in Figure 1B) may be served by multiple (e.g., two) TRPs 120 (individually illustrated as TRP1 120-1 and TRP2 120-2) . Figure 1B shows an example of a wireless communication system (e.g., a long term evolution (LTE) , 5G or NR cellular network) that includes a BS 120 and one or more user equipment (UE) 111, 112, and 113. In some embodiments, the uplink transmissions (131, 132, 133) can include uplink control information (UCI) , higher layer signaling (e.g., UE assistance information or UE capability) , or uplink information. In some embodiments, the downlink transmissions (141, 142, 143) can include downlink control information (DCI) or high layer signaling or downlink information. The UE may be, for example, a smartphone, a tablet, a mobile computer, a machine to machine (M2M) device, a terminal, a mobile device, an Internet of Things (IoT) device, and so on.
[0032] Figure 2 is a block diagram representation of a portion of an apparatus based on some embodiments of the disclosed technology. An apparatus 205 such as a network device (e.g., a base station (BS) ) or a wireless device (e.g., a user equipment (UE) ) , can include processor electronics 210 such as a microprocessor that implements one or more of the techniques presented in this document. The apparatus 205 can include transceiver electronics 215 to send and / or receive wireless signals over one or more communication interfaces such as antenna (s) 220. The apparatus 205 can include other communication interfaces for transmitting and receiving data. Apparatus 205 can include one or more memories (not explicitly shown) configured to store information such as data and / or instructions. In some implementations, the processor electronics 210 can include at least a portion of the transceiver electronics 215. In some embodiments, at least some of the disclosed techniques, modules or functions are implemented using the apparatus 205.
[0033] Figure 3 illustrates a flowchart of an example process 300 of wireless communication in accordance with some embodiments of the disclosed technology. As illustrated in Figure 3, CSI reporting may proceed as follows. At 310, a wireless device (e.g., 111, 112, 113 as illustrated in Figures 1A and 1B) may receive from a network device (e.g., 120-1 and 120-2 as illustrated in Figure 1A, 120 as illustrated in Figure 1B) one or more reference signals (RSs) or one or more sets of RSs for, e.g., channel measurement. In some embodiments, each RS or each set of RSs can correspond to a TRP involved in CJT. At 320, the wireless device may determine CSI based on the one or more RSs or the one or more sets of RSs. The CSI may include at least one of delay information corresponding to the one or more RSs or the one or more sets of RSs, frequency information corresponding to the one or more RSs or the one or more sets of RSs, or phase information corresponding to the one or more RSs or the one or more sets of RSs. At 330, the wireless device may transmit the CSI to the network device. More descriptions regarding the CSI and portions thereof, including the phase information, the delay information, the frequency information, a combination thereof, and CPU occupation for the CSI reporting, etc., may be found elsewhere in the present document.
[0034] Figure 4 illustrates a flowchart of an example process 400 of wireless communication in accordance with some embodiments of the disclosed technology. At 410, the network device (e.g., 120-1 and 120-2 as illustrated in Figure 1A, 120 as illustrated in Figure 1B) may transmit to a wireless device (e.g., 111, 112, 113 as illustrated in Figures 1A and 1B) one or more reference signals (RSs) or one or more sets of RSs for, e.g., channel measurement. At 420, the network device may receive from the wireless device CSI determined based on the one or more RSs or the one or more sets of RSs. The CSI may include at least one of delay information corresponding to the one or more RSs or the one or more sets of RSs, frequency information corresponding to the one or more RSs or the one or more sets of RSs, or phase information corresponding to the one or more RSs or the one or more sets of RSs. More descriptions regarding the CSI and portions thereof, including the phase information, the delay information, the frequency information, a combination thereof, and CPU occupation for the CSI reporting, etc., may be found elsewhere in the present document.
[0035] In some embodiments, the CSI may include two parts, CSI part 1 and CSI part 2. The payload size of CSI part 1 may be fixed for a given CSI configuration. For example, CSI part 1 may be used to identify the number of information bits in CSI part 2. The payload size of CSI part 2 may depend on the content of CSI part 1. CSI part 1 may have a higher reporting priority than CSI part 2. As used herein, the reporting priority may indicate a predetermined ranking or sequencing of information or data of the CSI for transmission and / or processing. A higher reporting priority in CSI reporting may indicate priority in resource allocation including, e.g., processing resources, transmission resources, such as frequency, time (amount and / or temporal order) . In some embodiments, CSI part 2 is omitted from the CSI reporting before CSI part 1 is omitted. In some embodiments, CSI part 1 is always reported. CSI part 1 may be transmitted in its entirety before part 2 may be transmitted. In some embodiments, CSI part 2, or a portion thereof, may be omitted. In some embodiments, CSI Part 2 can include multiple groups-such as group 0, group 1, group 2, and so on-each with distinct reporting priorities. For instance, the reporting priorities may decrease sequentially from CSI part 2 group 0 to group 1 to group 2, etc. The wireless device may omit certain portions of CSI part 2; when this occurs, groups with lower priorities may be omitted first.
[0036] Some embodiments of the present document relate to the phase information of the CSI. In some embodiments, the phase information of the CSI can include at least one of: one or more wideband / initial phase offsets relative to a reference wideband / initial phase. A wideband / initial phase offset (e.g., each of the one or more wideband / initial phase offsets) may be associated with a CSI-RS resource or resource set. The reference wideband / initial phase may be associated with a reference CSI-RS resource or resource set.
[0037] In some embodiments, the phase information of the CSI can include one or more subband phase offsets relative to a reference phase. A subband phase offset (e.g., each of the one or more subband phase offsets) may be associated with a CSI-RS resource or resource set. The reference subband phase offset may be associated with a reference CSI-RS resource or resource set. For the subband phase offsets associated with one common CSI-RS resource or resource set, they can be reported in a differential way. For example, the second to the last subband phase offsets are reported as: the difference between the 2nd subband phase offset and the 1st subband phase offset, the difference between the 3rd subband phase offset and the 2nd subband phase offset, …, the difference between the last subband phase offset and the second to last (or referred to as penultimate) subband phase offset.
[0038] The one or more subband phase offsets correspond to a set of subbands. In some embodiments, the number of subbands (or referred to as the subband count) can be reported by the wireless device (e.g., a UE) in the CSI, or configured by the network device (e.g, gNB) via an RRC parameter, or determined by a subband width. The subband width can be reported by the wireless device in the CSI, or configured by the network device (e.g., gNB) . The subband width can be measured in units of resource blocks (RBs) or resource elements (REs) . In some embodiments, the CSI may include two parts, CSI part 1 and CSI part 2, as described elsewhere in the present document. For example, the number of subbands can be included in CSI part 1, and the subband phase offsets can be included in CSI part 2. As another example, the subband width can be included in CSI part 1, and the subband phase offsets can be included in CSI part 2. In some embodiments, CSI Part 2 can include multiple groups-such as group 0, group 1, group 2, and so on-each with distinct reporting priorities. The wireless device may omit certain portions of CSI part 2; when this occurs, groups with lower priorities may be omitted first. For example, the number of subbands can be included in CSI part 2 group 1, and the subband phase offsets can be included in CSI part 2 group 2. As another example, the subband width can be included in CSI part 2 group 1, and the subband phase offsets can be included in CSI part 2 group 2.
[0039] In some embodiments, the phase information of the CSI can include one or more phase changes over a subband (or referred to as a subband phase change) . A subband phase change (e.g., each of the one or more subband phase changes) may be associated with one CSI-RS resource or resource set. For a CSI-RS resource or resource set, the subband phase offset in the l-th subband can be determined by the initial subband phase offset the phase change over a subband and index l. For example,
[0040] or
[0041] The subband phase change may be positive or negative. Whether the subband phase change is positive or negative can be indicated in the CSI by a one-bit indicator, e.g., as part of the phase information.
[0042] In some embodiments, the phase information of the CSI may include one or more FD bases / vectors, or one or more sets of FD bases / vectors. A FD basis / vector or a set of FD bases / vectors (e.g., each of the one or more FD bases / vectors, or each set of the one or more sets of FD bases / vectors) can be associated with a CSI-RS resource or resource set. For one CSI-RS resource or resource set, the associated FD basis or associated set of FD bases can be selected as the reference. For the remaining CSI-RS resources or resource sets other than the reference CSI-RS resource or resource set, the associated FD basis / vector or associated set of FD bases / vectors can be determined by the reference FD basis / vector or reference set of FD bases / vectors and a FD basis offset. For example, for a CSI-RS resource or resource set other than the reference CSI-RS resource or resource set, the index of the associated FD basis / vector, or the indices of the associated set of FD bases / vectors can be determined as the index / indices of the reference FD basis or reference set of FD bases plus the FD basis offset.
[0043] Some embodiments of the present document relate to the UCI design that may include multiplexing one or more of inter-TRP delay information, frequency information, or phase information (e.g., as described elsewhere in the present disclosure) , for the wireless device to report the inter-TRP difference (s) in the CSI.
[0044] The delay information of the CSI may include one or more delay offsets relative to a reference delay. A delay offset (e.g., each of the one or more delay offsets) may be associated with one CSI-RS resource or resource set. The reference delay may be associated with a reference CSI-RS resource or resource set. In some embodiments, the delay information may include one or more delay offsets relative to a reference delay and one or more 1-bit indicators. A delay offset (e.g., each of the one or more delay offsets) may be associated with one CSI-RS resource or resource set. The reference delay may be associated with one reference CSI-RS resource or resource set. A one-bit indictor (e.g., each of the one or more one-bit indicator) may be associated with one CSI-RS resource or resource set. In some embodiments, one or more one-bit indicators can be not reported (e.g., omitted from the CSI) . For example, for a CSI-RS resource or resource set, if the associated delay offset is indicated as ‘out of range’ or ‘invalid’ , then the associated one-bit indicator may be set to 0 and / or not reported (e.g., omitted from the CSI) ; otherwise, the associated 1-bit indicator is set to 1 and / or reported in the CSI.
[0045] The frequency information may include one or more frequency offsets relative to a reference frequency. A frequency offset (e.g., each of the one or more frequency offsets) may be associated with one CSI-RS resource or resource set. The reference frequency may be associated with one reference CSI-RS resource or resource set.
[0046] In some embodiments, a same reference CSI-RS resource or resource set may be associated with at least one of: a reference delay in the delay information, a reference frequency in the frequency information, or a reference phase (e.g., a reference subband phase) in the phase information. The reference CSI-RS resource or resource set may be indicated by an indicator in part 1 of the CSI (or referred to as CSI part 1) .
[0047] In some embodiments, the report quantities in the CSI can be configured via an RRC parameter. The report quantities in the CSI can be configured as at least one of:
[0048] – ‘Delay information only’
[0049] – ‘Frequency information only’
[0050] – ‘Phase information only’
[0051] – ‘Delay information and phase information’
[0052] – ‘Delay information and frequency information’
[0053] – ‘Frequency information and phase information’
[0054] – ‘Delay information and frequency information and phase information’
[0055] In some embodiments, the report quantities may be set as delay information only. In some embodiments, the reference CSI-RS resource or resource set indicator can be included in CSI part 1. In some embodiments, the one or more one-bit indicators of the delay information can be reported in CSI part 1, and the remaining delay information other than the one or more one-bit indicators can be included in CSI part 2. For example, for a CSI-RS resource or resource set, if the associated one-bit indicator is set to 0, then the associated delay offset can be not reported, and / or the associated delay offset may be indicated as ‘out of range’ or ‘invalid. ’ In some embodiments, the one or more delay offsets in the delay information may be included in a 1-part CSI or CSI part 1 of the CSI, and the one or more one-bit indicators in the delay information may be not reported (e.g., omitted from the CSI) . For example, for a CSI-RS resource or resource set, if the associated delay offset in the delay information is reported as ‘out of range’ or ‘invalid’ , the associated one-bit indicator in the delay information is set to zero; otherwise, the associated one-bit indicator in the delay information is set to one.
[0056] In some embodiments, the report quantities may be set as delay information and phase information. In some embodiments, the CSI may include two parts, CSI part 1 and CSI part 2, as described elsewhere in the present document. In some embodiments, CSI Part 2 can include multiple groups-such as group 0, group 1, group 2, and so on-each with distinct reporting priorities. For example, the reference CSI-RS resource or resource set indicator can be included in CSI part 1. As another example, the number of subbands (or referred to as the subband count) and / or the subband width can be included in CSI part 1. As a further example, the delay information can be included in CSI part 1, and the phase information can be included in CSI part 2. By way of illustration, for one CSI-RS resource or resource set, if the associated delay offset of the delay information is reported as ‘out of range’ or ‘invalid’ , then the associated phase quantities (including at least one of phase offset, phase change over a subband, and / or FD basis / bases) can be not reported (e.g., omitted from the CSI) , and / or the associated phase quantities (including at least one of phase offset, phase change over a subband, and / or FD basis / bases) can be indicated as ‘out of range’ or ‘invalid’ . As another illustration, the one or more one-bit indicators of the delay information are not reported (e.g., omitted from the CSI) ; for a CSI-RS resource or resource set, if the associated delay offset in the delay information is reported as ‘out of range’ or ‘invalid’ , the associated one-bit indicator in the delay information may be set to zero; otherwise, the associated one-bit indicator in the delay information may be set to one. As a still further example, the phase information can be included in CSI part 1, and the delay information can be included in CSI part 2. By way of illustration, for one CSI-RS resource or resource set, if the associated phase quantities (including at least one of phase offset, phase change over a subband, and / or FD basis / bases) are reported as ‘out of range’ or ‘invalid’ , then the associated delay offset can be not reported (e.g., omitted from the CSI) , and / or the associated delay offset can be indicated as ‘out of range’ or ‘invalid’ . As another illustration, for one CSI-RS resource or resource set, if the associated phase quantities (including at least one of phase offset, phase change over a subband, and / or FD basis / bases) are reported as ‘out of range’ or ‘invalid’ , then the associated 1-bit indicator of the delay information may be not reported (e.g., omitted from the CSI) , and / or the associated 1-bit indicator can be indicated as 0. As a further illustration, for one CSI-RS resource or resource set, if the associated phase quantities (including at least one of phase offset, phase change over a subband, and / or FD basis / bases) are not reported (e.g., omitted from the CSI) as ‘out of range’ or ‘invalid’ but the associated delay offset is reported as ‘out of range’ or ‘invalid’ , then the associated one-bit indicator be not reported (e.g., omitted from the CSI) , and / or the associated one-bit indicator can be indicated as 0. As a still further illustration, for one CSI-RS resource or resource set, if the associated phase quantities (including at least one of phase offset, phase change over a subband, and / or FD basis / bases) are not reported (e.g., omitted from the CSI) as ‘out of range’ or ‘invalid’ and the associated delay offset is not reported (e.g., omitted from the CSI) as ‘out of range’ or ‘invalid’ , then the associated 1-bit indicator of the delay information may be not reported (e.g., omitted from the CSI) , and / or the associated 1-bit indicator can be indicated as 1. In some embodiments, the 1-bit indicators in the delay information can be included in CSI part 1, and the remaining delay information (other than the 1-bit indicators) and the phase information can be included in CSI part 2. For example, for one CSI-RS resource or resource set, if the 1-bit indicator is set to 0, then one or both of the associated delay offset or the associated phase quantities (including at least one of phase offset, phase change over a subband, and / or FD basis / bases) can be not reported (e.g., omitted from the CSI) , and / or one or both of the associated delay offset or the associated phase quantities (including at least one of phase offset, phase change over a subband, and / or FD basis / bases) can be indicated as ‘out of range’ or ‘invalid’ in the CSI.
[0057] In some embodiments, the report quantities may be set as delay information and frequency information. In some embodiments, the CSI may include two parts, CSI part 1 and CSI part 2, as described elsewhere in the present document. In some embodiments, CSI Part 2 can include multiple groups-such as group 0, group 1, group 2, and so on-each with distinct reporting priorities. For example, the reference CSI-RS resource or resource set indicator can be included in CSI part 1. As another example, the delay information can be included in CSI part 1, and the frequency information can be included in CSI part 2. By way of illustration, for one CSI-RS resource or resource set, if the associated delay offset in the delay information is reported as ‘out of range’ or ‘invalid’ , then the associated frequency offset in the frequency information can be not reported (e.g., omitted from the CSI) , and / or the associated frequency offset can be indicated as ‘out of range’ or ‘invalid’ . In this illustrated scenario, the one or more one-bit indicators in the delay information are not reported (e.g., omitted from the CSI) ; for a CSI-RS resource or resource set, if the associated delay offset in the delay information is reported as ‘out of range’ or ‘invalid’ , then the associated one-bit indicator in the delay information may be set to zero; otherwise, the associated one-bit indicator in the delay information may be set to one. As a further example, the one or more one-bit indicators in the delay information may be included in CSI part 1 of the CSI, and the remaining delay information other than the one or more one-bit indicators and the phase information may be included in CSI part 2 of the CSI. As an illustration, for a CSI-RS resource or resource set, if the associated one-bit indicator in the delay information is set to zero, then one or both of the associated delay offset in the delay information and the associated frequency offset in the frequency information may be indicted as ‘out of range’ or ‘invalid’ , and / or one or both of the associated delay offset in the delay information and the associated frequency offset in the frequency information may be not reported in the CSI. As a still further example, the frequency information can be included in CSI part 1, and the delay information can be included in CSI part 2. By way of illustration, for one CSI-RS resource or resource set, if the associated frequency offset is reported as ‘out of range’ or ‘invalid’ , then the associated delay offset can be not reported, and / or the associated delay offset can be indicated as ‘out of range’ or ‘invalid’ . As another illustration, for one CSI-RS resource or resource set, if the associated frequency offset is reported as ‘out of range’ or ‘invalid’ , then the associated 1-bit indicator may be not reported (e.g., omitted from the CSI) , and / or the associated 1-bit indicator can be indicated as 0. As a further illustration, for one CSI-RS resource or resource set, if the associated frequency offset is not reported as ‘out of range’ or ‘invalid’ but the associated delay offset is reported as ‘out of range’ or ‘invalid’ , then the associated 1-bit indicator be not reported, and / or the associated 1-bit indicator can be indicated as 0. As a still further illustration, for one CSI-RS resource or resource set, if the associated frequency offset is not reported as ‘out of range’ or ‘invalid’ and the associated delay offset is not reported as ‘out of range’ or ‘invalid’ , then the associated 1-bit indicator be not reported (e.g., omitted from the CSI) , and / or the associated 1-bit indicator can be indicated as 1.
[0058] In some embodiments, the report quantities may be set as frequency information and phase information. In some embodiments, the CSI may include two parts, CSI part 1 and CSI part 2, as described elsewhere in the present document. In some embodiments, CSI Part 2 can include multiple groups-such as group 0, group 1, group 2, and so on-each with distinct reporting priorities. For example, the reference CSI-RS resource or resource set indicator can be included in CSI part 1. As another example, the number of subbands and / or the subband width can be included in CSI part 1. As a further example, the frequency information can be included in CSI part 1, and the phase information can be included in CSI part 2. By way of illustration, for one CSI-RS resource or resource set, if the associated frequency offset is reported as ‘out of range’ or ‘invalid’ , the associated phase quantities (including at least one of phase offset, phase change over a subband, and / or FD basis / bases) can be not reported (e.g., omitted from the CSI) , and / or the associated phase quantities (including at least one of phase offset, phase change over a subband, and / or FD basis / bases) can be indicated as ‘out of range’ or ‘invalid’ . As a further example, the phase information can be included in CSI part 1, and the frequency information can be included in CSI part 2. By way of illustration, for one CSI-RS resource or resource set, if the associated phase quantities (including at least one of phase offset, phase change over a subband, and / or FD basis / bases) are reported as ‘out of range’ or ‘invalid’ , the associated frequency offset can be not reported (e.g., omitted from the CSI) , and / or the associated frequency offset can be indicated as ‘out of range’ or ‘invalid’ .
[0059] In some embodiments, the report quantities may be set as delay information, phase information, and frequency information. In some embodiments, the CSI may include two parts, CSI part 1 and CSI part 2, as described elsewhere in the present document. In some embodiments, CSI Part 2 can include multiple groups-such as group 0, group 1, group 2, and so on-each with distinct reporting priorities. CSI part 1 may have a higher reporting priority than CSI part 2. In some embodiments, CSI part 1 is always reported. In some embodiments, CSI part 2, or a portion thereof, may be omitted. In some embodiments, CSI part 2 is omitted before CSI part 1. For example, the reference CSI-RS resource or resource set indicator can be included in CSI part 1. As another example, the number of subbands and / or the subband width can be included in CSI part 1. As a further example, the delay information can be included in CSI part 1, and the phase information and the frequency information can be included in CSI part 2. By way of illustration, for one CSI-RS resource or resource set, if the associated delay offset in the delay information is reported as ‘out of range’ or ‘invalid’ , then the associated phase quantities in the phase quantities (including at least one of phase offset, phase change over a subband, and / or FD basis / bases) and / or the associated frequency offset in the frequency information can be not reported (e.g., omitted from the CSI) , and / or the associated phase quantities (including at least one of phase offset, phase change over a subband, or FD basis / bases) and / or the associated frequency offset can be indicated as ‘out of range’ or ‘invalid’ . In this illustration, the one-bit indicators in the delay information may be not reported (e.g., omitted from the CSI) ; for a CSI-RS resource or resource set, if the associated delay offset in the delay information is reported as ‘out of range’ or ‘invalid’ , the associated one-bit indicator in the delay information may be set to zero; otherwise, the associated one-bit indicator in the delay information may be set to one. As a still further example, the frequency information can be included in CSI part 1, and the phase information and the delay information can be included in CSI part 2. By way of illustration, for one CSI-RS resource or resource set, if the associated frequency offset is reported as ‘out of range’ or ‘invalid’ , then the associated phase quantities (including at least one of phase offset, phase change over a subband, and / or FD basis / bases) and / or the associated delay offset can be not reported (e.g., omitted from the CSI) , and / or the associated phase quantities (including at least one of phase offset, phase change over a subband, and / or FD basis / bases) and / or the associated delay offset can be indicated as ‘out of range’ or ‘invalid’ . As another illustration, for one CSI-RS resource or resource set, if the associated frequency offset is reported as ‘out of range’ or ‘invalid’ , then the associated 1-bit indicator in the delay information can be not reported, and / or the associated 1-bit indicator in the delay information can be indicated as 0. As a further illustration, for one CSI-RS resource or resource set, if the associated frequency offset is not reported as ‘out of range’ or ‘invalid’ but at least one of the associated delay offset and the phase quantities (including at least one of phase offset, phase change over a subband, and / or FD basis / bases) is reported as ‘out of range’ or ‘invalid’ , then the associated 1-bit indicator in the delay information can be not reported (e.g., omitted from the CSI) , and / or the associated 1-bit indicator can be indicated as 0. As a still further illustration, for one CSI-RS resource or resource set, if the associated frequency offset is not reported as ‘out of range’ or ‘invalid’ and the one or both the associated delay offset and the phase quantities (including at least one of phase offset, phase change over a subband, and / or FD basis / bases) are not reported as ‘out of range’ or ‘invalid’ , then the associated 1-bit indicator in the delay information can be not reported (e.g., omitted from the CSI) , and / or the associated 1-bit indicator in the delay information can be indicated as 1. As a still further example, the phase information can be included in CSI part 1, and the delay information and the frequency information can be included in CSI part 2. By way of illustration, for one CSI-RS resource or resource set, if the associated phase quantities (including at least one of phase offset, phase change over a subband, and / or FD basis / bases) are reported as ‘out of range’ or ‘invalid’ , then the associated delay offset and / or the associated frequency offset can be not reported (e.g., omitted from the CSI) , and / or the associated delay offset and / or the associated frequency offset can be indicated as ‘out of range’ or ‘invalid’ . As another illustration, for one CSI-RS resource or resource set, if the associated phase quantities (including at least one of phase offset, phase change over a subband, and / or FD basis / bases) are reported as ‘out of range’ or ‘invalid’ , then the associated 1-bit indicator in the delay information can be not reported (e.g., omitted from the CSI) , and / or the associated 1-bit indicator in the delay information can be indicated as 0. As a further illustration, for one CSI-RS resource or resource set, if the associated phase quantities (including at least one of phase offset, phase change over a subband, and / or FD basis / bases) are not reported as ‘out of range’ or ‘invalid’ but at least one of the associated delay offset and the frequency offset is reported as ‘out of range’ or ‘invalid’ , then the associated 1-bit indicator in the delay information can be not reported (e.g., omitted from the CSI) , and / or the associated 1-bit indicator in the delay information can be indicated as 0. As a still further illustration, for one CSI-RS resource or resource set, if the associated phase quantities (including at least one of phase offset, phase change over a subband, and / or FD basis / bases) are not reported as ‘out of range’ or ‘invalid’ and one or both of the associated delay offset and the frequency offset is not reported as ‘out of range’ or ‘invalid’ , then the associated 1-bit indicator in the delay information can be not reported (e.g., omitted from the CSI) , and / or the associated 1-bit indicator in the delay information can be indicated as 1. As a still further example, the one or more 1-bit indicators in the delay information can be included in CSI part 1, and the remaining delay information other than the one or more one-bit indicators, the phase information, and the frequency information can be included in CSI part 2. As an illustration, for one CSI-RS resource or resource set, if the 1-bit indicator in the delay information is set to zero, then the associated delay offset, the associated frequency offset, and / or the associated phase quantities (including at least one of phase offset, phase change over a subband, and / or FD basis / bases) can be not reported (e.g., omitted from the CSI) , and / or the associated delay offset, the associated frequency offset, and / or the associated phase quantities (including at least one of phase offset, phase change over a subband, and / or FD basis / bases) can be indicated as ‘out of range’ or ‘invalid’ .
[0060] Some embodiments of the present document relate to the CSI reporting untis (CPU) and / or the reporting time (assessed based on Z / Z’) in the CSI reporting. For a CSI report with higher layer parameter reportQuantity not set to ‘none’ , the CPU (s) may be occupied for a number of OFDM symbols according to, e.g., clause 5.2.1.6 of TS 38.214. In some embodiments, the number (or count) of CPUs OCPU occupied by the CSI report on the wireless device can be determined by at least one of: the number of CSI-RS resources or resource sets N, a wireless device capability (or referred to as a UE capacity) X, the report quantities in the CSI report, or a value K. For example, OCPU can be determined according to at least one of: OCPU=KN, (4)
[0061] or OCPU=KXN. (5)
[0062] K in equation (4) and / or equation (5) can be determined by the report quantities in the CSI report. For instance, K = 1 when the report quantities are set as ‘Delay information only’ , ‘Frequency information only’ , or ‘Phase information only’ ; K = 2 when the report quantities are set as ‘Delay information and phase information’ or ‘Delay information and frequency information’ , K = 3 when the report quantities are set as ‘Delay information and frequency information and phase information’ .
[0063] For a CSI report (s) triggered by a DCI, the time line restriction may be according to, e.g., clause 5.4 of TS 38.214. In some embodiments, the Z / Z’ for the CSI report can be determined by at least one of the following: Z2 (e.g., being 40, 72, 141, or 152 as defined in Table 5.4-2 in TS 38.214) , Z2’ (e.g., being 37, 69, or 140 as defined in table 5.4-2 in TS 38.214) , the number of CSI-RS resources or resource sets N, a UE capability X, the report quantities in the CSI report, a predefined value C, or a value K. For example, Z can be determined according to at least one of: Z=Z2+KCN, … (6)
[0064] or Z=Z2+XKN. (7)
[0065] K in equation (6) and / or equation (7) can be determined by the report quantities in the CSI report. For instance, K = 1 when the report quantities are set as ‘Delay information only’ , ‘Frequency information only’ , or ‘Phase information only’ ; K = 2 when the report quantities are set as ‘Delay information and phase information’ or ‘Delay information and frequency information’ , K = 3 when the report quantities are set as ‘Delay information and frequency information and phase information’ .
[0066] For example, Z’ can be determined according to at least one of: Z′=Z′2+KCN, (8)
[0067] or Z′=Z′2+XKN. (9)
[0068] K in equation (8) and / or equation (9) can be determined by the report quantities in the CSI report. For instance, K = 1 when the report quantities are set as ‘Delay information only’ , ‘Frequency information only’ , or ‘Phase information only’ ; K = 2 when the report quantities are set as ‘Delay information and phase information’ or ‘Delay information and frequency information’ , K = 3 when the report quantities are set as ‘Delay information and frequency information and phase information’ .
[0069] Some embodiments may implement one or more of the following solutions, listed in clause-format. The following clauses are supported and further described in the embodiments above and throughout this document. As used in the clauses below and in the claims, a wireless device may be user equipment, mobile station, or any other wireless terminal including fixed nodes such as base stations. A network device includes a base station including a next generation Node B (gNB) , enhanced Node B (eNB) , or any other device that performs as a base station. The following listing of solutions may be implemented by some preferred embodiments.
[0070] Solution 1. A method (e.g., method 300 as shown in Figure 3) of wireless communication, comprising:
[0071] receiving (310) , at a wireless device from a network device, one or more reference signals (RSs) or one or more sets of RSs;
[0072] determining (320) , by the wireless device, channel state information (CSI) based on the one or more RSs or the one or more sets of RSs, wherein the CSI comprises at least one of delay information corresponding to the one or more RSs or the one or more sets of RSs, frequency information corresponding to the one or more RSs or the one or more sets of RSs, or phase information corresponding to the one or more RSs or the one or more sets of RSs, and
[0073] transmitting (330) , from the wireless device to the network device, the CSI.
[0074] Solution 2. A method (e.g., method 400 as shown in Figure 4) of wireless communication, comprising:
[0075] transmitting (410) , by a network device to a wireless device, one or more reference signals (RSs) or one or more sets of RSs; and
[0076] receiving (420) , at the network device from the wireless device, channel state information (CSI) determined based on the one or more RSs or the one or more sets of RSs, wherein the CSI comprises at least one of delay information corresponding to the one or more RSs or the one or more sets of RSs, frequency information corresponding to the one or more RSs or the one or more sets of RSs, or phase information corresponding to the one or more RSs or the one or more sets of RSs.
[0077] Solution 3. The method of any one or more of the solutions disclosed herein, the phase information comprising one or more wideband or initial phase offsets relative to a reference wideband or initial phase, wherein:
[0078] each of the one or more wideband or initial phase offsets is associated with a CSI-RS resource or resource set; and
[0079] the reference wideband or initial phase is associated with a reference CSI-RS resource or resource set.
[0080] Solution 4. The method of any one or more of the solutions disclosed herein, the phase information comprising one or more subband phase offsets relative to a reference subband phase, wherein:
[0081] each of the one or more subband phase offsets is associated with a CSI-RS resource or resource set; and
[0082] the reference subband phase is associated with a reference CSI-RS resource or resource set.
[0083] Solution 5. The method of any one or more of the solutions disclosed herein, wherein:
[0084] the one or more subband phase offsets comprise a plurality of subband phase offsets that are associated with one of the one or more CSI-RS resources or resource sets, and the plurality of subband offsets are reported in the CSI in a differential way.
[0085] Solution 6. The method of any one or more of the solutions disclosed herein, wherein:
[0086] the one or more subband phase offsets correspond to a set of subbands; and
[0087] a subband count of the subbands is reported by the wireless device in the CSI, or configured by the network device via an RRC parameter.
[0088] Solution 7. The method of any one or more of the solutions disclosed herein, wherein:
[0089] the subband count is included in CSI part 1 of the CSI; and
[0090] the one or more subband offsets are included in CSI part 2 of the CSI.
[0091] Solution 8. The method of any one or more of the solutions disclosed herein, wherein the one or more subband phase offsets correspond to a set of subbands; and
[0092] a subband count of the subbands is determined based on a subband width.
[0093] Solution 9. The method of any one or more of the solutions disclosed herein, wherein the subband width is reported by the wireless device in the CSI, or configured by the network device via an RRC parameter.
[0094] Solution 10. The method of any one or more of the solutions disclosed herein, wherein:
[0095] the subband width is included in CSI part 1 of the CSI; and
[0096] the one or more subband offsets are included in CSI part 2 of the CSI.
[0097] Solution 11. The method of any one or more of the solutions disclosed herein, wherein:
[0098] the phase information comprises one or more subband phase changes; and
[0099] each of the one or more subband phase changes is associated with a CSI-RS resource or resource set.
[0100] Solution 12. The method of any one or more of the solutions disclosed herein, wherein for one of the one or more CSI-RS resources or resource sets, a subband phase offset for an l-th subband is determined by an initial subband phase offset a subband phase change and an index l.
[0101] Solution 13. The method of any one or more of the solutions disclosed herein, wherein a subband width of subbands associated with one of the one or more CSI-RS resources or resource sets is reported by the wireless device in the CSI, or configured by the network device via an RRC parameter.
[0102] Solution 14. The method of any one or more of the solutions disclosed herein, the phase information comprising one or more frequency domain (FD) bases, one or more sets of FD bases, wherein each of the one or more FD bases, or each set of one or more sets of FD bases, is associated with a CSI-RS resource or resource set.
[0103] Solution 15. The method of any one or more of the solutions disclosed herein, wherein:
[0104] the delay information comprises one or more delay offsets relative to a reference delay, each of the one or more delay offsets being associated with a CSI-RS resource or resource set, and the reference delay being associated with a reference CSI-RS resource or resource set; and
[0105] the delay information further comprises one or more one-bit indicators, each of the one or more one-bit indicators is associated with a CSI-RS resource or resource set.
[0106] Solution 16. The method of any one or more of the solutions disclosed herein, wherein the frequency information comprises one or more frequency offsets relative to a reference frequency, each of the one or more frequency offsets being associated with a CSI-RS resource or resource set, and the reference frequency being associated with a reference CSI-RS resource or resource set.
[0107] Solution 17. The method of any one or more of the solutions disclosed herein, wherein report quantities in the CSI are configured by the network device via an RRC parameter.
[0108] Solution 18. The method of any one or more of the solutions disclosed herein, wherein the report quantities in the CSI are configured to include at least one of:
[0109] the delay information only;
[0110] the frequency information only;
[0111] the phase information only;
[0112] the delay information and the phase information;
[0113] the delay information and the frequency information;
[0114] the frequency information and the phase information; or
[0115] the delay information, the frequency information, and the phase information.
[0116] Solution 19. The method of any one or more of the solutions disclosed herein, wherein:
[0117] the reference CSI-RS resource or resource set is the same in at least one of: delay information, frequency information, or phase information; and
[0118] the reference CSI-RS resource or resource set is indicated by an indicator in CSI part 1.
[0119] Solution 20. The method of any one or more of the solutions disclosed herein, wherein:
[0120] the report quantities are configured to include the delay information only, the one or more one-bit indicators in the delay information are included in CSI part 1 of the CSI; and
[0121] the remaining delay information other than the one or more one-bit indicators is included in CSI part 2 of the CSI.
[0122] Solution 21. The method of any one or more of the solutions disclosed herein, wherein: for a CSI-RS resource or a CSI-RS resource set,
[0123] if the associated one-bit indicator in the delay information is set to 0, the associated delay offset is:
[0124] (a) indicated as ‘out of range’ or ‘invalid’ , or
[0125] (b) not reported in the CSI, or
[0126] (c) both indicated to be ‘out of range’ or ‘invalid’ and not reported in the CSI.
[0127] Solution 22. The method of any one or more of the solutions disclosed herein, wherein:
[0128] the report quantities are configured to include the delay information only; and
[0129] the one or more one-bit indicators in the delay information are not reported.
[0130] Solution 23. The method of any one or more of the solutions disclosed herein, wherein: for a CSI-RS resource or resource set,
[0131] if the associated delay offset in the delay information is reported as ‘out of range’ or ‘invalid’ , the associated one-bit indicator in the delay information is set to zero;
[0132] otherwise, the associated one-bit indicator in the delay information is set to one.
[0133] Solution 24. The method of any one or more of the solutions disclosed herein, wherein:
[0134] the report quantities are configured to include the delay information and the phase information, the delay information is included in CSI part 1 of the CSI; and
[0135] the phase information is included in CSI part 2 of the CSI.
[0136] Solution 25. The method of any one or more of the solutions disclosed herein, wherein for a CSI-RS resource or resource set, if the associated delay offset in the delay information is reported as ‘out of range’ or ‘invalid’ , the associated phase quantities including at least one of phase offset, phase change over a subband, or FD basis / bases in the phase information is:
[0137] (a) indicated to be ‘out of range’ or ‘invalid’ , or
[0138] (b) not reported in the CSI, or
[0139] (c) both indicated to be ‘out of range’ or ‘invalid’ and not reported in the CSI.
[0140] Solution 26. The method of any one or more of the solutions disclosed herein, wherein:
[0141] the one or more one-bit indicators are not reported; and
[0142] for a CSI-RS resource or resource set,
[0143] if the associated delay offset in the delay information is reported as ‘out of range’ or ‘invalid’ , the associated one-bit indicator in the delay information is set to zero;
[0144] otherwise, the associated one-bit indicator in the delay information is set to one.
[0145] Solution 27. The method of any one or more of the solutions disclosed herein, wherein:
[0146] the report quantities are configured to include the delay information and the phase information; and
[0147] the one or more one-bit indicators in the delay information are included in CSI part 1 of the CSI, and the remaining delay information other than the one or more 1-bit indicators and the phase information are included in the CSI part 2 of the CSI.
[0148] Solution 28. The method of any one or more of the solutions disclosed herein, wherein for a CSI-RS resource or resource set, if the associated one-bit indicator in the delay information is set to zero, one or both of the associated delay offset in the delay information and the associated phase quantities including at least one of phase offset, phase change over a subband, or FD basis / bases in the phase information are:
[0149] (a) indicted as ‘out of range’ or ‘invalid’ , or
[0150] (b) not reported in the CSI, or
[0151] (c) both indicated to be ‘out of range’ or ‘invalid’ and not reported in the CSI.
[0152] Solution 29. The method of any one or more of the solutions disclosed herein, wherein:
[0153] the report quantities are configured to include the delay information and the frequency information; and
[0154] the delay information is included in CSI part 1 of the CSI, and the frequency information is included in CSI part 2 of the CSI.
[0155] Solution 30. The method of any one or more of the solutions disclosed herein, wherein for a CSI-RS resource or resource set, if the associated delay offset in the delay information is reported as ‘out of range’ or ‘invalid’ , the associated frequency offset in the frequency information is:
[0156] (a) indicated to be ‘out of range’ or ‘invalid’ , or
[0157] (b) not reported in the CSI, or
[0158] (c) both indicated to be ‘out of range’ or ‘invalid’ and not reported in the CSI.
[0159] Solution 31. The method of any one or more of the solutions disclosed herein, wherein:
[0160] the one or more one-bit indicators in the delay information are not reported; and
[0161] for a CSI-RS resource or resource set,
[0162] if the associated delay offset in the delay information is reported as ‘out of range’ or ‘invalid’ , the associated one-bit indicator in the delay information is set to zero;
[0163] otherwise, the associated one-bit indicator in the delay information is set to one.
[0164] Solution 32. The method of any one or more of the solutions disclosed herein, wherein:
[0165] the report quantities are configured to include the delay information and the frequency information; and
[0166] the one or more one-bit indicators in the delay information are included in CSI part 1 of the CSI, and the remaining delay information other than the one or more one-bit indicators and the frequency information are included in CSI part 2 of the CSI.
[0167] Solution 33. The method of any one or more of the solutions disclosed herein, wherein for a CSI-RS resource or resource set, if the associated one-bit indicator in the delay information is set to zero, one or both of the associated delay offset in the delay information and the associated frequency offset in the frequency information are:
[0168] (a) indicted as ‘out of range’ or ‘invalid’ , or
[0169] (b) not reported in the CSI, or
[0170] (c) both indicated to be ‘out of range’ or ‘invalid’ and not reported in the CSI.
[0171] Solution 34. The method of any one or more of the solutions disclosed herein, wherein:
[0172] the report quantities are configured to include the delay information, the phase information, and the frequency information; and
[0173] the delay information is included in the CSI part 1 of the CSI, the phase information and the frequency information are included in the CSI part 2 of the CSI.
[0174] Solution 35. The method of any one or more of the solutions disclosed herein, wherein for a CSI-RS resource or resource set, if the associated delay offset in the delay information is reported as ‘out of range’ or ‘invalid’ , one or both of the associated phase quantities including at least one of phase offset, phase change over a subband, or FD basis / bases in the phase information or the associated frequency offset in the frequency information are:
[0175] (a) indicated to be ‘out of range’ or ‘invalid’ , or
[0176] (b) not reported in the CSI, or
[0177] (c) both indicated to be ‘out of range’ or ‘invalid’ and not reported in the CSI.
[0178] Solution 36. The method of any one or more of the solutions disclosed herein, wherein:
[0179] the one or more one-bit indicators in the delay information are not reported; and
[0180] for a CSI-RS resource or resource set,
[0181] if the associated delay offset in the delay information is reported as ‘out of range’ or ‘invalid’ , the associated one-bit indicator in the delay information is set to zero;
[0182] otherwise, and the associated one-bit indicator in the delay information is set to one.
[0183] Solution 37. The method of any one or more of the solutions disclosed herein, wherein:
[0184] the report quantities are configured to include the delay information, the phase information, and the frequency information; and
[0185] the one or more one-bit indicators in the delay information are included in the CSI part 1 of the CSI, the remaining delay information other than the one or more one-bit indicators, the phase information, and the frequency information are included in the CSI part 2 of the CSI.
[0186] Solution 38. The method of any one or more of the solutions disclosed herein, wherein for a CSI-RS resource or resource set, if the associated one-bit indicator in the delay information is set to zero, one or all of the associated delay offset in the delay information, the associated phase quantities including at least one of phase offset, phase change over a subband, or FD basis / bases in the phase information, and the associated frequency offset in the frequency information are:
[0187] (a) indicted as ‘out of range’ or ‘invalid’ , or
[0188] (b) not reported in the CSI, or
[0189] (c) both indicated to be ‘out of range’ or ‘invalid’ and not reported in the CSI.
[0190] Solution 39. The method of any one or more of the solutions disclosed herein, wherein a count of CSI processing units OCPU that are occupied by the CSI on the wireless device is determined by at least one of: a count of the one or more CSI-RS resources or resource sets N, a wireless device capability X, report quantities in the CSI, or a value K relating to the report quantities.
[0191] Solution 40. The method of any one or more of the solutions disclosed herein, wherein OCPU is determined by at least one of:
[0192] OCPU=KN, or
[0193] OCPU=KXN.
[0194] Solution 41. The method of any one or more of the solutions disclosed herein, wherein Z / Z’ indicating a time line restriction for the CSI is determined by at least one of the following: a count of the one or more CSI-RS resources or resource sets N, a wireless device capability X, report quantities in the CSI, a value K relating to the report quantities, or a scaling factor C.
[0195] Solution 42. The method of any one or more of the solutions disclosed herein, wherein Z is determined according to at least one of:
[0196] Z=Z2+KCN, or
[0197] Z=Z2+XKN,
[0198] in which Z2 is 40, 72, 141, or 152 as defined in Table 5.4-2 in TS 38.214.
[0199] Solution 43. The method of any one or more of the solutions disclosed herein, wherein Z’ is determined according to at least one of:
[0200] Z′=Z′2+KCN, or
[0201] Z′=Z′2+XKN,
[0202] in which Z2’ is 37, 69, or 140 as defined in Table 5.4-2 in TS 38.214.
[0203] Solution 44. The method of any one or more of the solutions disclosed herein, wherein:
[0204] K=1 when the report quantities are configured as the delay information only, the frequency information only, or the phase information only;
[0205] K = 2 when the report quantities are configured as the delay information and the phase information, or the delay information and the frequency information;
[0206] K = 3 when the report quantities are configured as the delay information, the frequency information, and the phase information.
[0207] Solution 45. The method of any one or more of the solutions disclosed herein, wherein the CSI includes CSI part 1 and CSI part 2 that has a lower reporting priority than the CSI part 1.
[0208] Solution 46. The method of any one or more of the solutions disclosed herein, wherein the CSI part 1 is always reported.
[0209] Solution 47. The method of any one or more of the solutions disclosed herein, wherein the CSI part 1 is transmitted in entirety before the CSI part 2 is transmitted.
[0210] Solution 48. The method of any one or more of the solutions disclosed herein, wherein the CSI part 2, or a portion thereof, is omitted from transmission to the network device.
[0211] Solution 49. The method of any one or more of the solutions disclosed herein, wherein the CSI part 2 comprises CSI part 2 group 1 and CSI part 2 group 2 that has a lower reporting priority than the CSI part 2 group 1.
[0212] Solution 50. A wireless communication device, comprising: at least one processor configured to perform the method of any one or more of the solutions disclosed herein.
[0213] Solution 51. One or more non-transitory computer-readable media storing computer-executable instructions that, when executed by one or more processors of a wireless communication device, cause the device to perform the method of any one or more of the solutions disclosed herein.
[0214] It will be appreciated that the present document discloses techniques that can be embodied in various embodiments to allow a UE-triggered reporting of beam report information. Specifically, events for beam reporting are defined based on measurement quality variation monitoring among beams at different time instances / beam groups or for different channels / RSs. The beam reporting would be triggered if any of the pre-defined events occurs. As the event-triggered beam report is initiated by the UE on demand, the reporting latency and uplink reporting resource consumption can be greatly reduced compared with the conventional beam report method.
[0215] The disclosed and other embodiments, modules and the functional operations described in this document can be implemented in digital electronic circuitry, or in computer software, firmware, or hardware, including the structures disclosed in this document and their structural equivalents, or in combinations of one or more of them. The disclosed and other embodiments can be implemented as one or more computer program products, i.e., one or more modules of computer program instructions encoded on a computer readable medium for execution by, or to control the operation of, data processing apparatus. The computer readable medium can be a machine-readable storage device, a machine-readable storage substrate, a memory device, a composition of matter effecting a machine-readable propagated signal, or a combination of one or more them. The term “data processing apparatus” encompasses all apparatus, devices, and machines for processing data, including by way of example a programmable processor, a computer, or multiple processors or computers. The apparatus can include, in addition to hardware, code that creates an execution environment for the computer program in question, e.g., code that constitutes processor firmware, a protocol stack, a database management system, an operating system, or a combination of one or more of them. A propagated signal is an artificially generated signal, e.g., a machine-generated electrical, optical, or electromagnetic signal, that is generated to encode information for transmission to suitable receiver apparatus.
[0216] A computer program (also known as a program, software, software application, script, or code) can be written in any form of programming language, including compiled or interpreted languages, and it can be deployed in any form, including as a stand-alone program or as a module, component, subroutine, or other unit suitable for use in a computing environment. A computer program does not necessarily correspond to a file in a file system. A program can be stored in a portion of a file that holds other programs or data (e.g., one or more scripts stored in a markup language document) , in a single file dedicated to the program in question, or in multiple coordinated files (e.g., files that store one or more modules, sub programs, or portions of code) . A computer program can be deployed to be executed on one computer or on multiple computers that are located at one site or distributed across multiple sites and interconnected by a communication network.
[0217] The processes and logic flows described in this document can be performed by one or more programmable processors executing one or more computer programs to perform functions by operating on input data and generating output. The processes and logic flows can also be performed by, and apparatus can also be implemented as, special purpose logic circuitry, e.g., an FPGA (field programmable gate array) or an ASIC (application specific integrated circuit) .
[0218] Processors suitable for the execution of a computer program include, by way of example, both general and special purpose microprocessors, and any one or more processors of any kind of digital computer. Generally, a processor will receive instructions and data from a read only memory or a random-access memory or both. The essential elements of a computer are a processor for performing instructions and one or more memory devices for storing instructions and data. Generally, a computer will also include, or be operatively coupled to receive data from or transfer data to, or both, one or more mass storage devices for storing data, e.g., magnetic, magneto optical disks, or optical disks. However, a computer need not have such devices. Computer readable media suitable for storing computer program instructions and data include all forms of non-volatile memory, media and memory devices, including by way of example semiconductor memory devices, e.g., EPROM, EEPROM, and flash memory devices; magnetic disks, e.g., internal hard disks or removable disks; magneto optical disks; and CD ROM and DVD-ROM disks. The processor and the memory can be supplemented by, or incorporated in, special purpose logic circuitry.
[0219] Some of the embodiments described herein are described in the general context of methods or processes, which may be implemented in one embodiment by a computer program product, embodied in a computer-readable medium, including computer-executable instructions, such as program code, executed by computers in networked environments. A computer-readable medium may include removable and non-removable storage devices including, but not limited to, Read Only Memory (ROM) , Random Access Memory (RAM) , compact discs (CDs) , digital versatile discs (DVD) , etc. Therefore, the computer-readable media can include a non-transitory storage media. Generally, program modules may include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. Computer-or processor-executable instructions, associated data structures, and program modules represent examples of program code for executing steps of the methods disclosed herein. The particular sequence of such executable instructions or associated data structures represents examples of corresponding acts for implementing the functions described in such steps or processes.
[0220] Some of the disclosed embodiments can be implemented as devices or modules using hardware circuits, software, or combinations thereof. For example, a hardware circuit implementation can include discrete analog and / or digital components that are, for example, integrated as part of a printed circuit board. Alternatively, or additionally, the disclosed components or modules can be implemented as an Application Specific Integrated Circuit (ASIC) and / or as a Field Programmable Gate Array (FPGA) device. Some implementations may additionally or alternatively include a digital signal processor (DSP) that is a specialized microprocessor with an architecture optimized for the operational needs of digital signal processing associated with the disclosed functionalities of this application. Similarly, the various components or sub-components within each module may be implemented in software, hardware or firmware. The connectivity between the modules and / or components within the modules may be provided using any one of the connectivity methods and media that is known in the art, including, but not limited to, communications over the Internet, wired, or wireless networks using the appropriate protocols.
[0221] While this document contains many specifics, these should not be construed as limitations on the scope of an invention that is claimed or of what may be claimed, but rather as descriptions of features specific to particular embodiments. Certain features that are described in this document in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable sub-combination. Moreover, although features may be described above as acting in certain combinations and even initially claimed as such, one or more features from a claimed combination can in some implementations be excised from the combination, and the claimed combination may be directed to a sub-combination or a variation of a sub-combination. Similarly, while operations are depicted in the drawings in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results.
[0222] Only a few implementations and examples are described and other implementations, enhancements and variations can be made based on what is described and illustrated in this disclosure.
Claims
1.A method of wireless communication, comprising:receiving, at a wireless device from a network device, one or more reference signals (RSs) or one or more sets of RSs;determining, by the wireless device, channel state information (CSI) based on the one or more RSs or the one or more sets of RSs, wherein the CSI comprises at least one of delay information corresponding to the one or more RSs or the one or more sets of RSs, frequency information corresponding to the one or more RSs or the one or more sets of RSs, or phase information corresponding to the one or more RSs or the one or more sets of RSs; andtransmitting, from the wireless device to the network device, the CSI.2.A method of wireless communication, comprising:transmitting, by a network device to a wireless device, one or more reference signals (RSs) or one or more sets of RSs; andreceiving, at the network device from the wireless device, channel state information (CSI) determined based on the one or more RSs or the one or more sets of RSs, wherein the CSI comprises at least one of delay information corresponding to the one or more RSs or the one or more sets of RSs, frequency information corresponding to the one or more RSs or the one or more sets of RSs, or phase information corresponding to the one or more RSs or the one or more sets of RSs.3.The method of claim 1 or claim 2, the phase information comprising one or more wideband or initial phase offsets relative to a reference wideband or initial phase, wherein:each of the one or more wideband or initial phase offsets is associated with a CSI-RS resource or resource set; andthe reference wideband or initial phase is associated with a reference CSI-RS resource or resource set.4.The method of claim 1 or claim 2, the phase information comprising one or more subband phase offsets relative to a reference subband phase, wherein:each of the one or more subband phase offsets is associated with a CSI-RS resource or resource set; andthe reference subband phase is associated with a reference CSI-RS resource or resource set.5.The method of claim 4, wherein:the one or more subband phase offsets comprise a plurality of subband phase offsets that are associated with one of the one or more CSI-RS resources or resource sets, andthe plurality of subband offsets are reported in the CSI in a differential way.6.The method of claim 4, wherein:the one or more subband phase offsets correspond to a set of subbands; anda subband count of the subbands is reported by the wireless device in the CSI, or configured by the network device via an RRC parameter.7.The method of claim 6, wherein:the subband count is included in CSI part 1 of the CSI; andthe one or more subband offsets are included in CSI part 2 of the CSI.8.The method of claim 4, whereinthe one or more subband phase offsets correspond to a set of subbands; anda subband count of the subbands is determined based on a subband width.9.The method of claim 8, wherein the subband width is reported by the wireless device in the CSI, or configured by the network device via an RRC parameter.10.The method of claim 9, wherein:the subband width is included in CSI part 1 of the CSI; andthe one or more subband offsets are included in CSI part 2 of the CSI.11.The method of claim 1 or claim 2, wherein:the phase information comprises one or more subband phase changes; andeach of the one or more subband phase changes is associated with a CSI-RS resource or resource set.12.The method of claim 11, wherein for one of the one or more CSI-RS resources or resource sets, a subband phase offset for an l-th subband is determined by an initial subband phase offset asubband phase change and an index l.13.The method of claim 11, wherein a subband width of subbands associated with one of the one or more CSI-RS resources or resource sets is reported by the wireless device in the CSI, or configured by the network device via an RRC parameter.14.The method of claim 1 or claim 2, the phase information comprising one or more frequency domain (FD) bases, one or more sets of FD bases, wherein each of the one or more FD bases, or each set of one or more sets of FD bases, is associated with a CSI-RS resource or resource set.15.The method of claim 1 or claim 2, wherein:the delay information comprises one or more delay offsets relative to a reference delay, each of the one or more delay offsets being associated with a CSI-RS resource or resource set, and the reference delay being associated with a reference CSI-RS resource or resource set; andthe delay information further comprises one or more one-bit indicators, each of the one or more one-bit indicators is associated with a CSI-RS resource or resource set.16.The method of claim 1 or claim 2, wherein the frequency information comprises one or more frequency offsets relative to a reference frequency, each of the one or more frequency offsets being associated with a CSI-RS resource or resource set, and the reference frequency being associated with a reference CSI-RS resource or resource set.17.The method of any one of claims 1 to 18, wherein report quantities in the CSI are configured by the network device via an RRC parameter.18.The method of claim 17, wherein the report quantities in the CSI are configured to include at least one of:the delay information only;the frequency information only;the phase information only;the delay information and the phase information;the delay information and the frequency information;the frequency information and the phase information; orthe delay information, the frequency information, and the phase information.19.The method of claims 18, wherein:the reference CSI-RS resource or resource set is the same in at least one of: delay information, frequency information, or phase information; andthe reference CSI-RS resource or resource set is indicated by an indicator in CSI part 1.20.The method of claim 18, wherein:the report quantities are configured to include the delay information only, the one or more one-bit indicators in the delay information are included in CSI part 1 of the CSI; andthe remaining delay information other than the one or more one-bit indicators is included in CSI part 2 of the CSI.21.The method of claim 20, wherein: for a CSI-RS resource or a CSI-RS resource set, if the associated one-bit indicator in the delay information is set to 0, the associated delay offset is:(a) indicated as ‘out of range’ or ‘invalid’ , or(b) not reported in the CSI, or(c) both indicated as 'out of range' or 'invalid' and not reported in the CSI.22.The method of claim 18, wherein:the report quantities are configured to include the delay information only; andthe one or more one-bit indicators in the delay information are not reported.23.The method of claim 22, wherein: for a CSI-RS resource or resource set,if the associated delay offset in the delay information is reported as ‘out of range’ or ‘invalid’ , the associated one-bit indicator in the delay information is set to zero;otherwise, the associated one-bit indicator in the delay information is set to one.24.The method of claim 18, wherein:the report quantities are configured to include the delay information and the phaseinformation, the delay information is included in CSI part 1 of the CSI; andthe phase information is included in CSI part 2 of the CSI.25.The method of claim 24, wherein for a CSI-RS resource or resource set, if the associateddelay offset in the delay information is reported as ‘out of range’ or ‘invalid’ , the associatedphase quantities including at least one of 濴 phase offset, a subband phase change, or FDbasis / bases in the phase information is:(a) indicated to be ‘out of range’ or ‘invalid’ , or(b)not reported in the CSI, or(c) both indicated as 'out of range' or 'invalid' and not reported in the CSI.26.The method of claim 24, wherein:the one or more one-bit indicators are not reported; andfor a CSI-RS resource or resource set,if the associated delay offset in the delay information is reported as ‘out of range’ or ‘invalid’ , the associated one-bit indicator in the delay information is set to zero;otherwise, the associated one-bit indicator in the delay information is set to one.27.The method of claim 18, wherein:the report quantities are configured to include the delay information and the phase information; andthe one or more one-bit indicators in the delay information are included in CSI part 1 of the CSI, and the remaining delay information other than the one or more 1-bit indicators and the phase information are included in the CSI part 2 of the CSI.28.The method of claim 27, wherein for a CSI-RS resource or resource set, if the associated one-bit indicator in the delay information is set to zero, one or both of the associated delay offset in the delay information and the associated phase quantities including at least one of phase offset, phase change over a subband, or FD basis / bases in the phase information are:(a) indicted as ‘out of range’ or ‘invalid’ , or(b) not reported in the CSI, or(c) both indicated as 'out of range' or 'invalid' and not reported in the CSI.29.The method of claim 18, wherein:the report quantities are configured to include the delay information and the frequency information; andthe delay information is included in CSI part 1 of the CSI, and the frequency information is included in CSI part 2 of the CSI.30.The method of claim 29, wherein for a CSI-RS resource or resource set, if the associated delay offset in the delay information is reported as ‘out of range’ or ‘invalid’ , the associated frequency offset in the frequency information is:(a) indicated to be ‘out of range’ or ‘invalid’ , or(b) not reported in the CSI, or(c) both indicated to be ‘out of range’ or ‘invalid’ and not reported in the CSI.31.The method of claim 30, wherein:the one or more one-bit indicators in the delay information are not reported; andfor a CSI-RS resource or resource set,if the associated delay offset in the delay information is reported as ‘out of range’ or ‘invalid’ , the associated one-bit indicator in the delay information is set to zero;otherwise, the associated one-bit indicator in the delay information is set to one.32.The method of claim 18, wherein:the report quantities are configured to include the delay information and the frequency information; andthe one or more one-bit indicators in the delay information are included in CSI part 1 of the CSI, and the remaining delay information other than the one or more one-bit indicators and the frequency information are included in CSI part 2 of the CSI.33.The method of claim 32, wherein for a CSI-RS resource or resource set, if the associated one-bit indicator in the delay information is set to zero, one or both of the associated delay offset in the delay information and the associated frequency offset in the frequency information are:(a) indicted as ‘out of range’ or ‘invalid’ , or(b) not reported in the CSI, or(c) both indicted as ‘out of range’ or ‘invalid’ and not reported in the CSI.34.The method of claim 18, wherein:the report quantities are configured to include the delay information, the phase information, and the frequency information; andthe delay information is included in the CSI part 1 of the CSI, the phase information and the frequency information are included in the CSI part 2 of the CSI.35.The method of claim 34, wherein for a CSI-RS resource or resource set, if the associated delay offset in the delay information is reported as ‘out of range’ or ‘invalid’ , one or both of the associated phase quantities including at least one of phase offset, phase change over a subband, or FD basis / bases in the phase information or the associated frequency offset in the frequency information are:(a) indicated to be ‘out of range’ or ‘invalid’ , or(b) not reported in the CSI, or(c) both indicted as ‘out of range’ or ‘invalid’ or not reported in the CSI.36.The method of claim 35, wherein:the one or more one-bit indicators in the delay information are not reported; andfor a CSI-RS resource or resource set,if the associated delay offset in the delay information is reported as ‘out of range’ or ‘invalid’ , the associated one-bit indicator in the delay information is set to zero;otherwise, and the associated one-bit indicator in the delay information is set to one.37.The method of claim 18, wherein:the report quantities are configured to include the delay information, the phase information, and the frequency information; andthe one or more one-bit indicators in the delay information are included in the CSI part 1 of the CSI, the remaining delay information other than the one or more one-bit indicators, the phase information, and the frequency information are included in the CSI part 2 of the CSI.38.The method of claim 37, wherein for a CSI-RS resource or resource set, if the associated one-bit indicator in the delay information is set to zero, one or all of the associated delay offset in the delay information, the associated phase quantities including at least one of phase offset, phase change over a subband, or FD basis / bases in the phase information, and the associated frequency offset in the frequency information are:(a) indicted as ‘out of range’ or ‘invalid’ , or(b) not reported in the CSI, or(c) both indicted as ‘out of range’ or ‘invalid’ and not reported in the CSI.39.The method of claim 1 or claim 2, wherein a count of CSI processing units OCPU that are occupied by the CSI on the wireless device is determined by at least one of: a count of the one or more CSI-RS resources or resource sets N, a wireless device capability X, report quantities in the CSI, or a value K relating to the report quantities.40.The method of claim 39, wherein OCPU is determined by at least one of: OCPU=KN, or OCPU=KXN.41.The method of claim 1 or claim 2, wherein Z / Z’ indicating a time line restriction for the CSI is determined by at least one of the following: a count of the one or more CSI-RS resources or resource sets N, a wireless device capability X, report quantities in the CSI, a value K relating to the report quantities, or a scaling factor C.42.The method of claim 41, wherein Z is determined according to at least one of: Z=Z2+KCN, or Z=Z2+XKN,in which Z2 is 40, 72, 141, or 152 as defined in Table 5.4-2 in TS 38.214.43.The method of claim 41, wherein Z’ is determined according to at least one of: Z′=Z′2+KCN, or Z′=Z′2+XKN,in which Z2’ is 37, 69, or 140 as defined in Table 5.4-2 in TS 38.214.44.The method of any one of claims 39-43, wherein:K=1 when the report quantities are configured as the delay information only, the frequency information only, or the phase information only;K = 2 when the report quantities are configured as the delay information and the phase information, or the delay information and the frequency information;K = 3 when the report quantities are configured as the delay information, the frequency information, and the phase information.45.The method of claim 1 or claim 2, wherein the CSI includes CSI part 1 and CSI part 2 that has a lower reporting priority than the CSI part 1.46.The method of claim 45, wherein the CSI part 1 is always reported.47.The method of claim 45 or claim 46, wherein the CSI part 1 is transmitted in entirety before the CSI part 2 is transmitted.48.The method of any one of claims 45-47, wherein the CSI part 2, or a portion thereof, is omitted from transmission to the network device.49.The method of any one of claims 45-48, wherein the CSI part 2 comprises CSI part 2 group 1 and CSI part 2 group 2 that has a lower reporting priority than the CSI part 2 group 1.50.A wireless communication device, comprising: at least one processor configured to perform the method of any one of claims 1-49.51.One or more non-transitory computer-readable media storing computer-executable instructions that, when executed by one or more processors of a wireless communication device, cause the device to perform the method of any one of claims 1-49.
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