Channel state information reporting technique for coherent joint transmission
By implementing power back off scaling, defining CMR mappings, and linking SRS/CSI-RS occasions, the CSI calculation challenges in CJT are resolved, improving communication performance and reliability.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- ZTE CORP
- Filing Date
- 2024-11-08
- Publication Date
- 2026-05-15
AI Technical Summary
Existing wireless communication technologies face challenges in accurately calculating channel state information (CSI) due to issues such as power back off scaling, inter-TRP delay/frequency misalignment, and inter-TRP UL/DL phase misalignment, which lead to performance degradation in coherent joint transmission (CJT) scenarios.
The proposed solutions include incorporating power back off scaling factors, defining mapping relationships between CMRs of CJT calibration and CSI reports, indicating the need to consider delay/frequency information in CSI calculations, and establishing a linkage between SRS and CSI-RS occasions for inter-TRP phase measurement to enhance CSI reporting accuracy.
These solutions improve CSI calculation precision, reducing interference and enhancing the performance of CJT by addressing the misalignment issues, thereby supporting more reliable and efficient wireless communication.
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Figure CN2024130785_15052026_PF_FP_ABST
Abstract
Description
CHANNEL STATE INFORMATION REPORTING TECHNIQUE FOR COHERENT JOINT TRANSMISSIONTECHNICAL FIELD
[0001] This document is directed generally to digital wireless communications.BACKGROUND
[0002] Mobile telecommunication technologies are moving the world toward an increasingly connected and networked society. In comparison with the existing wireless networks, next generation systems and wireless communication techniques will need to support a much wider range of use-case characteristics and provide a more complex and sophisticated range of access requirements and flexibilities.
[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-A wireless standards and is committed to supporting higher data-rates, large number of connections, ultra-low latency, high reliability and other emerging business needs.SUMMARY
[0004] Techniques are disclosed for channel state information (CSI) reporting for a coherent joint transmission (CJT) . The disclosed technologies relate to 3rd Generation Partnership project (3GPP) Radio Access Network Working Group 1 (RAN1) Multiple Input Multiple Output (MIMO) technology.
[0005] A first example wireless communication method includes: receiving, by a communication device, a CSI reporting configuration signaling associated with one or more reference signals (RS) or one or more RS sets; determining, by the communication device, a CSI based on at least one of the CSI reporting configuration signaling, the one or more RSs, or the one or more RS sets; and transmitting, by the communication device, the CSI to the network device.
[0006] A second example wireless communication method includes: transmitting, by a network device, a CSI reporting configuration signaling associated with one or more RSs or one or more RS sets; and receiving, by the network device, a CSI from a communication device, wherein the CSI is determined based on at least one of the CSI reporting configuration signaling, the one or more RSs, or the one or more RS sets.
[0007] In yet another exemplary aspect, the above-described methods are embodied in the form of processor-executable code and stored in a non-transitory computer-readable storage medium. The code included in the computer readable storage medium when executed by a processor, causes the processor to implement the methods described in this patent document.
[0008] In yet another exemplary embodiment, an apparatus that is configured or operable to perform the above-described methods is disclosed.
[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] FIG. 1 shows an example flowchart for transmitting channel state information (CSI) by a communication device.
[0012] FIG. 2 shows an example flowchart for receiving CSI by a network device.
[0013] FIG. 3 shows an exemplary block diagram of a hardware platform that may be a part of a network device or a communication device.
[0014] FIG. 4 shows an example of wireless communication including a base station (BS) and user equipment (UE) based on some implementations of the disclosed technology.DETAILED DESCRIPTION
[0015] The disclosed technology provides implementations and examples of wireless communications. While 5G terminology is used in some cases to facilitate understanding of the disclosed techniques, which may be applied to wireless systems and devices that use communication protocols other than 5G or 3GPP protocols.
[0016] To prevent strong interference with satellites from terrestrial base stations (BS) , the upward transmission power of the BS should be limited. Then a power back off scaling factor should be applied to the upward transmitted beams. The power back off scaling factor should be considered when user equipment (UE) calculates the channel state information (CSI) including CSI-Reference Signal (RS) resource indicator (CRI) , rank indicator (RI) , precoding matrix indicator (PMI) , and channel quality indicator (CQI) . The power back off scaling factor (soft codebook subset restriction) is supported for Type-II codebook, but it is not supported for Type-I codebook. However, it is still unclear how the power back off scaling factor should be considered in the CSI calculation.
[0017] For frequency-division duplex (FDD) multiple-transmission-reception-point (M-TRP) coherent joint transmission (CJT) , inter-TRP delay / frequency misalignment would cause strong frequency / temporal selectivity and significant performance degradation. Rel-19 introduces CJT calibration reporting where UE can measure inter-TRP delay / frequency information and report the information to the BS. After the BS acquires the inter-TRP delay / frequency information, the BS would apply the inter-TRP delay / frequency offset (s) to Physical Down-link Control Channel (PDSCH) pre-compensation to improve the CJT performance. In this example, the CJT precoding is based on a CJT calibration report that may include inter-TRP delay / frequency information and a CJT CSI report that may include CRI, RI, PMI and / or CQI. So, the calculation of the CJT CSI report should be based on the CJT calibration report. From the specification perspective, the CJT CSI report should be linked with the CJT calibration report so that the UE can calculate the CJT CSI report based on the linked CJT calibration report. In other words, the CJT calibration report and the associated CJT CSI report can be jointly or separately triggered and reported. When they are jointly triggered and reported, the numbers of Channel Measurement Resources (CMR) of the CJT calibration report and CJT CSI report should be the same. Accordingly, there should be a one-to-one mapping relationship between the CMRs of the two reports. In other words, when they are separately triggered and reported, the number of CMRs of the CJT calibration reports can be equal to or larger than that of the CJT CSI report. Then there should be a one-to-one mapping relationship between some of the CMRs of the CJT calibration report and the CMRs of the CJT CSI report. There are still some open issues related to the linkage between the CJT calibration report and the CJT CSI report, e.g., the mapping relationship between the CMRs for the two reports. Further, when they are separately triggered, the CJT calibration report should be triggered and reported before the CJT CSI report. The BS may fail to receive or decode the CJT calibration report, so the BS need to inform the UE whether it should consider the inter-TRP delay / frequency information in the CJT calibration report to calculate the CJT CSI.
[0018] For time-division duplex M-TRP CJT, inter-TRP UL / DL phase misalignment would break the reciprocity assumption and cause significant performance degradation. For Rel-19 CJT calibration reporting, the UE may also measure and report inter-TRP phase information to help the BS performs inter-TRP UL / DL phase calibration. The inter-TRP UL / DL phase misalignment is measured via DL CSI-RS and UL SRS. To guarantee the measurement accuracy, the UE should use the same antenna to receive the CSI-RS and transmit the Sounding Reference Signal (SRS) . So from the specification perspective, there should be a linkage between the CSI-RS and the SRS for inter-TRP UL / DL phase misalignment measurement. However, the definition of the SRS occasion associated with the CSI-RS occasion for inter-TRP phase measurement is unclear. In other words, for inter-TRP phase measurement, the SRS occasion can be before or after the associated CSI-RS occasion. Generally, there are two implementations for inter-TRP UL / DL phase measurement. One is that the DL CSI-RS is precoded based on the UL SRS so that the SRS will be transmitted before CSI-RS. The other is that the DL CSI-RS is not precoded based on the UL SRS so that the SRS can be transmitted before or after the CSI-RS. So the BS can inform the UE whether it can use the SRS occasion after the CSI-RS occasion to measure the inter-TRP phase.
[0019] Thus, to address at least the above-mentioned technical problems, this patent document describes technical solutions related to at least the followings: CSI calculation based on power back off scaling factor; mapping relationship between the CMRs of CJT calibration report and CJT CSI report; indication of whether UE should consider the delay / frequency information in CJT calibration report when calculating CJT CSI report; and linkage between SRS occasion and CSI-RS occasion for inter-TRP phase measurement.
[0020] I. Introduction
[0021] In some embodiments disclosed in this patent document:
[0022] ● ‘UE’ can include a wireless communication device or a communication device;
[0023] ● ‘gNB’ can include a base station (BS) , wireless network device, network device or TRP;
[0024] ● ‘time unit’ can include a sub-symbol, a symbol, a slot, a sub-frame, a frame, or a transmission occasion;
[0025] ● ‘frequency unit’ can include a subcarrier spacing, a resource block (RB) , resource group (RG) , precoder resource group (PRG) , a subband;
[0026] ● ‘Higher layer parameter’ can include a parameter, a Radio Resource Control (RRC) parameter, a Radio Resource Management (RRM) parameter, a Radio Resource Arrangement (RRA) parameter, Downlink Control Information (DCI) , or Physical Down-link Control Channel (PDCCH) ;
[0027] ● ‘Delay information’ can include inter-TRP delay information, inter-TRP delay misalignment, UL / DL inter-TRP delay misalignment, delay offset (DO) , inter-TRP DO, UL / DL inter-TRP DO;
[0028] ● ‘Frequency information’ can include inter-TRP frequency information, inter-TRP frequency misalignment, UL / DL inter-TRP frequency misalignment, frequency offset (FO) , inter-TRP FO, UL / DL inter-TRP FO;
[0029] ● ‘Phase information’ can include inter-TRP phase information, inter-TRP phase misalignment, UL / DL inter-TRP phase misalignment, inter-TRP phase, UL / DL inter-TRP phase, phase offset (PO) , inter-TRP PO, UL / DL inter-TRP PO.
[0030] Some example embodiments are described to highlight certain features of the disclosed technology. Although section headings are used for ease of presentation, the techniques described in one embodiment may be combined with another embodiment in a reasonable manner.
[0031] II. (a) Example Embodiment#0
[0032] Either the CJT calibration report or the CJT CSI report can be a kind of CSI report. The CJT calibration report may include at least one of delay / frequency / phase information. The delay / frequency / phase information may include at least inter-TRP DO / FO / PO, respectively. The CJT CSI report may include at least one of CRI / RI / PMI / CQI or at least one for CRI / RI / PMI / CQI for CJT. The general procedure of CSI reporting is as follows:
[0033] ● UE receives at least one of: a CSI reporting configuration signaling, where the configuration signaling may be associated with one or more RSs, or one or more sets of RSs. In some embodiments, the one or more RSs are one or more CSI-RSs.
[0034] ● The UE determines a CSI based on the CSI reporting configuration signaling and / or the one or more RSs.
[0035] ○ The CSI can include at least one of: a CRI, an RI, a PMI, or a CQI.
[0036] ○ The CSI (CJT CSI report) can include at least one of: a CRI, an RI, a PMI, or a CQI for CJT.
[0037] ○ The CSI (CJT calibration report) can include at least one of: delay information, frequency information, or phase information.
[0038] ● The UE reports the CSI to gNB.
[0039] II. (b) . Embodiment 1: CSI calculation based on power back off scaling factor
[0040] ● The CSI reporting configuration signaling can include one or more scaling factors s. s is smaller than or equal to 1, and each s is associated with a group of spatial domain (SD) basis vectors, e.g., si is associated with the i-th group of SD basis vectors.
[0041] ○ When UE calculates or determines the CSI, including RI / PMI / CQI, the UE assumes the amplitude or power of a SD basis vector vl, m is scaled by a scaling coefficient cl, m, where the scaling coefficient cl, m is determined by at least one of: the scaling factor sl, m associated with the SD basis vector vl, m, the number of layers rl, m associated with the SD basis vector vl, m, or a minimization operation.
[0042] ■ The scaling coefficient can be determined by at least one of:
[0043] □ or
[0044] □ sl, m or
[0045] □ or
[0046] □ or
[0047] □ or
[0048] □ or
[0049] □ or
[0050] □ min(1, sl, m ) or
[0051] ● The PMI can include at least one of: one or more SD basis vector indicators or one or more inter-polarization co-phase indicators.
[0052] ● The precoding matrix indicated by the PMI can be determined by at least one of: one or more SD basis vectors vl, m (indicated by the one or more SD basis vector indicators) , scaling coefficients cl, m associated with the one or more SD basis vectors vl, m, one or more inter-polarization co-phases (indicated by the one or more inter-polarization co-phase indicators) , or a normalization coefficient α.
[0053] ○ The precoding matrix indicated by the PMI can be at least one of:
[0054] ■ or
[0055] ■
[0056] ■ or
[0057] where cl, m and cl′, m′ are the scaling coefficients associated with SD basis vectors vl, m and vl′, m′, respectively; and vl, m and vl′, m′ are the SD basis vectors indicated by the one or more SD basis vectors.
[0058] ○ The normalization coefficient α can be determined by at least one of: a number of ranks of the precoding matrix v, a number of CSI-RS ports PCSI-RS across one or more CSI-RS resources, or the scaling coefficients cl, m associated with the one or more SD basis vectors vl, m.
[0059] ■ The normalization coefficient α can be determined by at least one of:
[0060] □ 1
[0061] □
[0062] □
[0063] □
[0064] □
[0065] □
[0066] ○ The scaling coefficient cl, m associated with the SD basis vector vl, m can be determined by at least one of: the scaling factor sl, m associated with the SD basis vector vl, m, or a number of layers rl, m associated with the SD basis vector vl, m.
[0067] ■ The scaling coefficient cl, m associated with SD basis vector vl, m can be determined by at least one of:
[0068] □
[0069] □ sl, m
[0070] □
[0071] □
[0072] □
[0073] □
[0074] □
[0075] □ min(1, sl, m)
[0076] II. (c) . Embodiment 2: Mapping relationship between the CMRs of the CJT calibration report and the CJT CSI report.
[0077] The CSI reporting signaling can include at least one of:
[0078] ● A CSI reporting setting of a CJT calibration report
[0079] ○ The CSI reporting setting of the CJT calibration report can be associated with one or more CSI-RS resource sets (or one or more tracking reference signal (TRS) sets) . In the following discussion, these CSI-RS resource sets may be referred to as the CSI-RS resource sets associated with the CJT calibration report.
[0080] ● A CSI reporting setting of a CJT CSI report
[0081] ○ The CSI reporting setting of the CJT CSI report can be associated with one or more CSI-RS resources. In the following discussion, these CSI-RS resources may be referred to as the CSI-RS resources associated with the CJT CSI report.
[0082] ● The number of CSI-RS resources associated with the CJT CSI report can be equal to or smaller than the number of CSI-RS resource sets associated with the CJT calibration report.
[0083] ○ All or a portion of the CSI-RS resource sets associated with CJT calibration report can be respectively associated with the CSI-RS resources associated with the CJT CSI report. In the CJT CSI calculation, UE should consider the delay or frequency information derived from the CSI-RS resource sets in delay or frequency pre-compensation of the associated CSI-RS resources. For example, the CSI-RS resource sets associated with the CJT calibration report include CSI-RS resource set #1, #2, #3, and #4, and the CSI-RS resources associated with the CJT CSI report includes CSI-RS resource #1 and #2. The CSI-RS resource set #2 and #4 can be associated with the CSI-RS resource #1 and #2, respectively. In the calculation of the CJT CSI report, The UE should consider the delay or frequency information derived from the CSI-RS resource sets #2 and #4 in delay or frequency pre-compensation of the CSI-RS resources #1 and #2, respectively.
[0084] ■ The portion of the CSI-RS resource sets associated with the CJT calibration report can be indicated by at least one of:
[0085] □ A bitmap
[0086] ○ A length of the bitmap can be equal to the number of CSI-RS resource sets associated with the CJT calibration report or the maximum possible number of CSI-RS resource sets associated with the CJT calibration report
[0087] ○ The i-th bit in the bitmap can be associated with the CSI-RS resource set with i-th lowest / highest ID associated with the CJT calibration report
[0088] ○ When a bit in the bitmap is set to 1, the CSI-RS resource set associated with the bit can be selected as one of the portion of the CSI-RS resource sets
[0089] □ A combinatorial number
[0090] ○ The number of bits used to indicate the combinatorial number can be determined by at least one of: the number of CSI-RS resource sets associated with the CJT calibration report, the maximum possible number of CSI-RS resource sets associated with the CJT calibration report, or the number of CSI-RS resources associated with the CJT CSI report
[0091] □ One or more CSI-RS resource set IDs
[0092] ○ Each CSI-RS resource associated with the CJT CSI report can be associated or configured with a CSI-RS resource set ID
[0093] ○ If one CSI-RS resource is not associated or configured with a CSI-RS resource set ID, the UE does not perform delay or frequency pre-compensation for the CSI-RS resource.
[0094] ■ The CSI-RS resource sets with the lowest ID to the highest ID in the portion of the CSI-RS resource sets can be associated with the CSI-RS resources with lowest ID to highest ID
[0095] ■ The CSI-RS resource sets with the highest ID to the lowest ID in the portion of the CSI-RS resource sets can be associated with the CSI-RS resources with the highest ID to the lowest ID
[0096] II. (d) . Embodiment 3: Indication of whether UE should consider the delay / frequency information in CJT calibration report when calculating CJT CSI report
[0097] The CSI reporting configuration signaling can include a CSI reporting setting of a CJT calibration report and a CSI reporting setting of a CJT CSI report.
[0098] ● The CSI reporting setting of the CJT CSI report can be associated with the CSI reporting setting of the CJT CSI report, where the CJT CSI report is associated with the CJT calibration report. UE should calculate the CJT CSI report based on the delay or frequency information in the CJT calibration report.
[0099] ○ The associated CJT calibration report and the CJT CSI report can be triggered by two separate DCIs and reported on two separate slots. Each DCI is associated with an aperiodic CSI trigger state, each trigger state is associated with one or more CSI-AssociatedReportConfigInfo, each CSI-AssociatedReportConfigInfo can be associated with a CSI reporting setting of a CJT CSI report.
[0100] ■ The trigger state can include a 1-bit indicator.
[0101] □ If the 1-bit indicator is set to 1, for each of all the CJT CSI reports associated with CSI-AssociatedReportConfigInfo in the trigger state that is associated with a CJT calibration report, the UE should consider the delay or frequency information in the latest CJT calibration report before the first symbol of the DCI triggering the CJT CSI report in calculating the CJT CSI report.
[0102] ○ Note that, the latest CJT calibration report should be within a limited time interval before the first symbol of the DCI triggering the CJT CSI report. The length of the time interval can be a predefined value or determined by a UE capability.
[0103] □ If the 1-bit indicator is set to 0, for each of all the CJT CSI reports associated with CSI-AssociatedReportConfigInfo in the trigger state that is associated with a CJT calibration report, the UE should not consider additional delay or frequency information in calculating the CJT CSI report, or the UE should consider the delay or frequency information in the most recent or latest valid CJT calibration report before the latest CJT calibration report before the first symbol of the DCI triggering the CJT CSI report in calculating the CJT CSI report.
[0104] ○ Note that, the most recent or latest valid CJT calibration report before the latest CJT calibration report should be within a limited time interval before the first symbol of the DCI triggering the CJT CSI report. The length of the time interval can be a predefined value or determined by a UE capability.
[0105] ■ For a CSI-AssociatedReportConfigInfo associated with a CSI reporting setting of a CJT CSI report, the CSI-AssociatedReportConfigInfo can include a 1-bit indicator.
[0106] □ If the 1-bit indicator is set to 1, the UE should consider the delay or frequency information in the latest CJT calibration report associated with the CJT CSI report before the first symbol of the DCI triggering the CJT CSI report in calculating the CJT CSI report.
[0107] ○ Note that, the latest CJT calibration report should be within a limited time interval before the first symbol of the DCI triggering the CJT CSI report. The length of the time interval can be a predefined value or determined by a UE capability.
[0108] □ If the 1-bit indicator is set to 0, UE should not consider additional delay or frequency information in calculating the CJT CSI, or UE should consider the delay or frequency information in the most recent or latest valid CJT calibration report associated with the CJT CSI report before the latest CJT calibration report associated with the CJT CSI report before the first symbol of the DCI triggering the CJT CSI report in calculating the CJT CSI report.
[0109] ○ Note that, the most recent or latest valid CJT calibration report before the latest CJT calibration report should be within a limited time interval before the first symbol of the DCI triggering the CJT CSI report. The length of the time interval can be a predefined value or determined by a UE capability.
[0110] ■ For a CSI-AssociatedReportConfigInfo associated with a CSI reporting setting of a CJT CSI report and the CJT CSI report is associated with CJT calibration report, the CSI-AssociatedReportConfigInfo can include a bitmap.
[0111] □ A length of the bitmap can be equal to the number of CSI-RS resources associated with the CSI reporting setting of the CJT CSI report.
[0112] □ The length of the bitmap can be equal to the maximum possible number of CSI-RS resources associated with the CSI reporting setting of the CJT CSI report.
[0113] □ The length of the bitmap can be a predefined value, e.g., 4.
[0114] □ The i-th bit in the bitmap can be associated with the i-th CSI-RS resource associated with the CSI reporting setting of the CJT CSI report.
[0115] □ The i-th bit in the bitmap can be associated with the CSI-RS resource with the i-th lowest or highest ID associated with the CSI reporting setting of the CJT CSI report.
[0116] □ If a bit in the bitmap is set to 1, UE should consider the delay or frequency information in the latest CJT calibration report associated with the CJT CSI report before the first symbol of the DCI triggering the CJT CSI in calculating the CJT CSI or CJT CSI content corresponding to the CSI-RS resource associated with the bit. For example, the UE should perform delay or frequency pre-compensation for the CSI-RS resource associated with the bit based on the delay or frequency information in the latest CJT calibration report before the first symbol of the DCI triggering the CJT CSI report.
[0117] ○ Note that, the latest CJT calibration report should be within a limited time interval before the first symbol of the DCI triggering the CJT CSI report. The length of the time interval can be a predefined value or determined by a UE capability.
[0118] □ If a bit in the bitmap is set to 0, the UE does not consider the delay or frequency information in the latest CJT calibration report before the first symbol of the DCI triggering the CJT CSI report in calculating the CJT CSI or CJT CSI content corresponding to the CSI-RS resource associated with the bit, or UE should consider the delay or frequency information in the most recent or latest valid CJT calibration report associated with the CJT CSI report before the latest CJT calibration report associated with the CJT CSI report before the first symbol of the DCI triggering the CJT CSI report in calculating the CJT CSI or CJT CSI content corresponding to the CSI-RS associated with the bit. For example, the UE does not perform delay or frequency per-compensation for the CSI-RS resource associated with the bit, or UE should perform delay or frequency compensation for the CSI-RS resource associated with the bit based on the delay or frequency information in the most recent / latest valid CJT calibration report before the latest CJT calibration report before the first symbol of the DCI triggering the CJT CSI report.
[0119] ○ Note that, the most recent or latest valid CJT calibration report before the latest CJT calibration report should be within a limited time interval before the first symbol of the DCI triggering the CJT CSI report. The length of the time interval can be a predefined value or determined by a UE capability.
[0120] II. (e) . Embodiment 4: Linkage between SRS occasion and CSI-RS occasion for inter-TRP phase measurement
[0121] For a CJT calibration report includes at least phase information, the CSI reporting configuration signaling can include a CSI reporting setting, and the CSI reporting setting can be associated with one or more SRS resources or one or more (e.g., NTRP) CSI-RS resources. For a specific occasion of the SRS resources and a specific occasion of the CSI-RS resources used for measuring the CJT calibration report, UE should use a same antenna port to transmit an indicated SRS port associated with the SRS resources and receive the CSI-RS.
[0122] ● The specific occasion of the SRS resources can be the most recent or latest occasion before the occasion of the CSI-RS resources used for measuring the CJT calibration report, or the earliest occasion of the SRS resources after the occasion of the CSI-RS resources used for measuring the CJT calibration report.
[0123] ○ Whether the specific occasion of the SRS resources used for measuring the CJT calibration report can be the earliest occasion of the SRS resources after the occasion of the CSI-RS resources used for measuring the CJT calibration report can be determined by a 1-bit indicator. The 1-bit indicator can be included in the CSI reporting setting of the CJT calibration report or in an aperiodic CSI trigger state.
[0124] ■ If the 1-bit indicator is set to 0 / 1, the specific occasion of the SRS resources used for measuring the CJT calibration report can be the latest SRS transmission occasion before the occasion of the CSI-RS resources used for measuring the CJT calibration report.
[0125] ■ Otherwise (the 1-bit indicator is set to 1 / 0) , the specific occasion of the SRS resources used for measuring the CJT calibration report can be the earliest occasion of the SRS resources after the occasion of the CSI-RS resources used for measuring the CJT calibration report.
[0126] ■ Otherwise (the 1-bit indicator is set to 1 / 0) , the specific occasion of the SRS resources used for measuring the CJT calibration report can be the occasion of the SRS resources that occurs closest to the occasion of the CSI-RS resources used for measuring the CJT calibration report, where the time distance between the occasion of the SRS resources and the occasion of the CSI-RS resources used for measuring the CJT calibration report is shortest.
[0127] FIG. 1 shows an example flowchart for transmitting CSI by a communication device.
[0128] In some examples, the communication device is the user equipment (UE) 411, 412, or 413 in FIG. 4. Operation 102 includes receiving, by a communication device, a CSI reporting configuration signaling associated with one or more RSs or one or more RS sets. Operation 104 includes determining, by the communication device, a CSI based on at least one of the CSI reporting configuration signaling, the one or more RSs, or the one or more RS sets. Operation 106 includes transmitting, by the communication device, the CSI to the network device.
[0129] In some embodiments, the CSI reporting configuration signaling comprises one or more scaling factors, each of the one or more scaling factors being no greater than 1, and each of the one or more scaling factors being associated with one or more SD basis vectors.
[0130] In some embodiments, the CSI report comprises at least one of a CRI, a RI, a PMI, or a CQI, and the wireless communication device determines the CSI based on the one or more SD basis vectors.
[0131] In some embodiments, an amplitude or power of each of the one or more SD basis vector vl, m is scaled by a scaling coefficient cl, m associated with the SD basis vector vl, m.
[0132] In some embodiments, a precoding matrix indicated by the PMI is determined based on the one or more SD basis vectors vl, m, one or more scaling coefficients cl, m respectively associated with the one or more SD basis vectors vl, m, one or more inter-polarization co-phases, or a normalization coefficient.
[0133] In some embodiments, a scaling coefficient cl, m associated with a SD basis vector vl, m is determined by at least one of: a scaling factor sl, m associated with the SD basis vector vl, m, a number of layers rl, m associated with the SD basis vector vl, m, a number of ranks v, or a minimization operation.
[0134] In some embodiments, the scaling coefficient cl, m associated with the SD basis vector vl, m is determined by at least one of:
[0135] sl, m,
[0136] min(1, sl, m), or
[0137] In some embodiments, the CSI comprises at least one of a CJT CSI report or a CJT calibration report, the CJT calibration report comprises at least one of delay information, frequency information, or phase information, and the CJT CSI report comprises at least one of a CRI, a RI, a PMI, or a CQI.
[0138] In some embodiments, the CSI reporting configuration signaling comprises a CSI reporting setting of a CJT calibration report and a CSI reporting setting of a CJT CSI report, the CSI reporting setting of the CJT calibration report is associated with the CSI reporting setting of the CJT CSI report, the CJT calibration report is associated with the CJT CSI report, and the CSI reporting setting of the CJT calibration report is associated with one or more CSI-RS resource sets or one or more TRS sets, and the CSI reporting setting of the CJT CSI report is associated with one or more CSI-RS resources.
[0139] In some embodiments, a number of the one or more CSI-RS resources associated with the CJT CSI report is equal to or smaller than a number of the one or more CSI-RS resource sets associated with the CJT calibration report.
[0140] In some embodiments, at least a portion of the one or more CSI-RS resource sets associated with the CJT calibration report respectively corresponds to the one or more CSI-RS resources associated with the CJT CSI report, and the CJT CSI report is determined based on delay or frequency information corresponding to each of the at least a portion of the one or more CSI-RS resource sets associated with the CJT calibration report.
[0141] In some embodiments, a portion of the CJT CSI report corresponding to one of the one or more CSI-RS resources associated with the CJT CSI report is determined based on delay or frequency information corresponding to one of the at least a portion of the one or more CSI-RS resource sets corresponding to the one of the one or more CSI-RS resources associated with the CJT CSI report.
[0142] In some embodiments, the at least a portion of the one or more CSI-RS resource sets associated with the CJT calibration report is indicated by at least one of a bitmap, a combinatorial number, or one or more CSI-RS resource set IDs.
[0143] In some embodiments, a length of the bitmap is equal to the number of the one or more CSI-RS resource sets associated with the CJT calibration report or a maximum possible number of CSI-RS resource sets associated with the CJT calibration report.
[0144] In some embodiments, an i-th bit in the bitmap is associated with a CSI-RS resource set with an i-th lowest or highest CSI-RS resource set ID associated with the CJT calibration report, and when a bit in the bitmap is set to a value, the CSI-RS resource set associated with the bit is selected to be one of the at least a portion of the one or more CSI-RS resource sets associated with the CJT calibration report, the value being either zero or one.
[0145] In some embodiments, a number of bits used to indicate the combinatorial number is determined by at least one of the number of the one or more CSI-RS resource sets associated with the CJT calibration report, a maximum possible number of CSI-RS resource sets associated with the CJT calibration report, or the number of the one or more CSI-RS resources associated with the CJT CSI report.
[0146] In some embodiments, each CSI-RS resource associated with the CJT CSI report is associated or configured with one of the one or more CSI-RS resource set IDs.
[0147] In some embodiments, the wireless communication device does not consider any delay or frequency information for a CSI-RS resource associated with the CJT CSI report in calculating the CJT CSI report when the CSI-RS resource is not associated or configured with any one of the one or more CSI-RS resource set IDs.
[0148] In some embodiments, one of the at least a portion of the one or more CSI-RS resources sets associated with the CJT calibration report having an i-th lowest CSI-RS resource set ID is associated with one of the one or more CSI-RS resource associated with the CJT CSI report having an i-th lowest CSI-RS resource ID.
[0149] In some embodiments, one of the at least a portion of the one or more CSI-RS resources sets associated with the CJT calibration report having an i-th highest CSI-RS resource set ID is associated with one of the one or more CSI-RS resource associated with the CJT CSI report having an i-th highest CSI-RS resource ID.
[0150] In some embodiments, the CJT calibration report and the CJT CSI report are triggered by two separate DCI messages, each DCI message is associated with an aperiodic CSI trigger state, each aperiodic CSI trigger state is associated with one or more CSI-AssociatedReportConfigInfo messages, and one of the one or more CSI-AssociatedReportConfigInfo messages is associated with the CSI reporting setting of the CJT CSI report.
[0151] In some embodiments, the aperiodic CSI trigger state comprises a one-bit indicator, when the one-bit indicator is set to a first value, the CJT CSI report is determined based on delay or frequency information in the CJT calibration report associated with the CJT CSI report, and when the one-bit indicator is set to a second value, the CJT CSI report is determined based on no additional delay or frequency information.
[0152] In some embodiments, the one of the one or more CSI-AssociatedReportConfigInfo messages comprises a one-bit indicator, when the one-bit indicator is set to a first value, the wireless communication determines the CJT CSI report based on delay or frequency information in the CJT calibration report associated with the CJT CSI report, and when the one-bit indicator is set to a second value, the wireless communication device determines the CJT CSI report based on no additional delay or frequency information, the second value being different from the first value.
[0153] In some embodiments, when the CJT calibration report comprises at least phase information, the CSI reporting configuration signaling comprises a CSI reporting setting associated with an SRS resource or a CSI-RS resource.
[0154] In some embodiments, a same antenna port of the communication device is used to transmit an SRS corresponding to a specific occasion of the SRS resource and receive a CSI-RS corresponding to a specific occasion of the CSI-RS resource for measuring the CJT calibration report.
[0155] In some embodiments, the CSI reporting configuration signaling comprises a one-bit indicator, and the specific occasion of the SRS resource is determined by the one-bit indicator.
[0156] In some embodiments, when the one-bit indicator is set to a first value, the specific occasion of the SRS resource is a latest occasion of the SRS resource before the occasion of the CSI-RS resource for measuring the CJT calibration report.
[0157] In some embodiments, when the one-bit indicator is set to a second value, the specific occasion of the SRS resource is a latest occasion of the SRS resource before the occasion of the CSI-RS resource for measuring the CJT calibration report, or an earliest occasion of the SRS resource after the occasion of the CSI-RS resource for measuring the CJT calibration report, the second value being different from the first value.
[0158] In some embodiments, when the one-bit indicator is set to a second value, the specific occasion of the SRS resource occurs closest to the occasion of the CSI-RS resource for measuring the CJT calibration report.
[0159] FIG. 2 shows an example flowchart for receiving CSI by a network device. In some examples, the network device is the base station 420. Operation 202 includes transmitting, by a network device, a CSI reporting configuration signaling associated with one or more RSs or one or more RS sets. Operation 204 includes receiving, by the network device, a CSI from a communication device, where the CSI is determined based on at least one of the CSI reporting configuration signaling, the one or more RSs, or the one or more RS sets.
[0160] FIG. 3 shows an exemplary block diagram of a hardware platform 300 that may be a part of a network device (e.g., base station) or a communication device (e.g., a user equipment (UE) ) . The hardware platform 300 includes at least one processor 310 and a memory 305 having instructions stored thereupon. The instructions upon execution by the processor 310 configure the hardware platform 300 to perform the operations described in FIGS. 1 to 2 and in the various embodiments described in this patent document. The transmitter 315 transmits or sends information or data to another device. For example, a network device transmitter can send a message to a user equipment. The receiver 320 receives information or data transmitted or sent by another device. For example, a user equipment can receive a message from a network device.
[0161] FIG. 4 shows an exemplary wireless communication system (e.g., a 5G or NR cellular network) . For example, the implementations as discussed above may apply to the wireless communication system as shown in FIG. 4 that includes a base station 420 and one or more UE 411, 412 and 413. In some embodiments, the UEs access the BS (e.g., the network) using a communication link to the network (sometimes called uplink direction, as depicted by dashed arrows 431, 432, 433) , which then enables subsequent communication (e.g., shown in the direction from the network to the UEs, sometimes called downlink direction, shown by arrows 441, 442, 443) from the BS to the UEs. In some embodiments, the BS send information to the UEs (sometimes called downlink direction, as depicted by arrows 441, 442, 443) , which then enables subsequent communication (e.g., shown in the direction from the UEs to the BS, sometimes called uplink direction, shown by dashed arrows 431, 432, 433) from the UEs to the BS. The UE may be, for example, a smartphone, a tablet, a mobile computer, a machine to machine (M2M) device, an Internet of Things (IoT) device, and so on.
[0162] In this document the term “exemplary” is used to mean “an example of” and, unless otherwise stated, does not imply an ideal or a preferred embodiment.
[0163] 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.
[0164] 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.
[0165] 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 cases 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.
[0166] 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 wireless communication method, comprising:receiving, by a communication device, a channel state information (CSI) reporting configuration signaling associated with one or more reference signals (RS) or one or more RS sets;determining, by the communication device, a CSI based on at least one of the CSI reporting configuration signaling, the one or more RSs, or the one or more RS sets; andtransmitting, by the communication device, the CSI to the network device.2.A wireless communication method, comprising:transmitting, by a network device, a channel state information (CSI) reporting configuration signaling associated with one or more reference signals (RS) or one or more RS sets; andreceiving, by the network device, a CSI from a communication device, wherein the CSI is determined based on at least one of the CSI reporting configuration signaling, the one or more RSs, or the one or more RS sets.3.The wireless communication method of claim 1 or claim 2, wherein the CSI reporting configuration signaling comprises one or more scaling factors, each of the one or more scaling factors being no greater than 1, and each of the one or more scaling factors being associated with one or more spatial domain (SD) basis vectors.4.The wireless communication method of claims 3, wherein the CSI report comprises at least one of a CSI-RS resource indicator (CRI) , a rank indicator (RI) , a precoding matrix indicator (PMI) , or a channel quality indicator (CQI) , and wherein the wireless communication device determines the CSI based on the one or more spatial-domain (SD) basis vectors.5.The wireless communication method of claim 3 or claim 4, wherein an amplitude or power of each of the one or more SD basis vector vl, m is scaled by a scaling coefficient cl, m associated with the SD basis vector vl, m.6.The wireless communication method of claim 4 or claim 5, wherein a precoding matrix indicated by the PMI is determined based on the one or more SD basis vectors vl, m, one or more scaling coefficients cl, m respectively associated with the one or more SD basis vectors vl, m, one or more inter-polarization co-phases, or a normalization coefficient.7.The wireless communication method of claim 5 or claim 6, wherein a scaling coefficient cl,m associated with a SD basis vector vl, m is determined by at least one of: a scaling factor sl, m associated with the SD basis vector vl, m, a number of layers rl, m associated with the SD basis vector vl, m, a number of ranks v, or a minimization operation.8.The wireless communication method of claim 7, the scaling coefficient cl, m associated with the SD basis vector vl, m is determined by at least one of: sl, m, min (1, sl, m) , or 9.The wireless communication method of claim 1 or claim 2, wherein the CSI comprises at least one of a Coherent Joint Transmission (CJT) CSI report or a CJT calibration report, wherein the CJT calibration report comprises at least one of delay information, frequency information, or phase information, and wherein the CJT CSI report comprises at least one of a CSI-RS resource indicator (CRI) , a rank indicator (RI) , a precoding matrix indicator (PMI) , or a channel quality indicator (CQI) .10.The wireless communication method of any of claims 1, 2, and 9, wherein the CSI reporting configuration signaling comprises a CSI reporting setting of a CJT calibration report and a CSI reporting setting of a CJT CSI report, wherein the CSI reporting setting of the CJT calibration report is associated with the CSI reporting setting of the CJT CSI report, wherein the CJT calibration report is associated with the CJT CSI report, and wherein the CSI reporting setting of the CJT calibration report is associated with one or more CSI-RS resource sets or one or more tracking reference signal (TRS) sets, and wherein the CSI reporting setting of the CJT CSI report is associated with one or more CSI-RS resources.11.The wireless communication method of claim 10, wherein a number of the one or more CSI-RS resources associated with the CJT CSI report is equal to or smaller than a number of the one or more CSI-RS resource sets associated with the CJT calibration report.12.The wireless communication method of claim 11, wherein at least a portion of the one or more CSI-RS resource sets associated with the CJT calibration report respectively corresponds to the one or more CSI-RS resources associated with the CJT CSI report, and wherein the CJT CSI report is determined based on delay or frequency information corresponding to each of the at least a portion of the one or more CSI-RS resource sets associated with the CJT calibration report.13.The wireless communication method of claim 12, wherein a portion of the CJT CSI report corresponding to one of the one or more CSI-RS resources associated with the CJT CSI report is determined based on delay or frequency information corresponding to one of the at least a portion of the one or more CSI-RS resource sets corresponding to the one of the one or more CSI-RS resources associated with the CJT CSI report.14.The wireless communication method of claim 12 or claim 13, wherein the at least a portion of the one or more CSI-RS resource sets associated with the CJT calibration report is indicated by at least one of a bitmap, a combinatorial number, or one or more CSI-RS resource set identifiers (IDs) .15.The wireless communication method of claim 14, wherein a length of the bitmap is equal to the number of the one or more CSI-RS resource sets associated with the CJT calibration report or a maximum possible number of CSI-RS resource sets associated with the CJT calibration report.16.The wireless communication method of claim 14 or claim 15, wherein an i-th bit in the bitmap is associated with a CSI-RS resource set with an i-th lowest or highest CSI-RS resource set ID associated with the CJT calibration report, and wherein when a bit in the bitmap is set to a value, the CSI-RS resource set associated with the bit is selected to be one of the at least a portion of the one or more CSI-RS resource sets associated with the CJT calibration report, the value being either zero or one.17.The wireless communication method of claim 14, wherein a number of bits used to indicate the combinatorial number is determined by at least one of the number of the one or more CSI-RS resource sets associated with the CJT calibration report, a maximum possible number of CSI-RS resource sets associated with the CJT calibration report, or the number of the one or more CSI-RS resources associated with the CJT CSI report.18.The wireless communication method of claim 14, wherein each CSI-RS resource associated with the CJT CSI report is associated or configured with one of the one or more CSI-RS resource set IDs.19.The wireless communication method of claim 14, wherein the wireless communication device does not consider any delay or frequency information for a CSI-RS resource associated with the CJT CSI report in calculating the CJT CSI report when the CSI-RS resource is not associated or configured with any one of the one or more CSI-RS resource set IDs.20.The wireless communication method of claim 12 or claim 14, wherein one of the at least a portion of the one or more CSI-RS resources sets associated with the CJT calibration report having an i-th lowest CSI-RS resource set ID is associated with one of the one or more CSI-RS resource associated with the CJT CSI report having an i-th lowest CSI-RS resource ID.21.The wireless communication method of claim 12 or claim 14, wherein one of the at least a portion of the one or more CSI-RS resources sets associated with the CJT calibration report having an i-th highest CSI-RS resource set ID is associated with one of the one or more CSI-RS resource associated with the CJT CSI report having an i-th highest CSI-RS resource ID.22.The wireless communication method of any of claims 10-21, wherein the CJT calibration report and the CJT CSI report are triggered by two separate Downlink Control Information (DCI) messages, wherein each DCI message is associated with an aperiodic CSI trigger state, wherein each aperiodic CSI trigger state is associated with one or more CSI-AssociatedReportConfigInfo messages, and wherein one of the one or more CSI-AssociatedReportConfigInfo messages is associated with the CSI reporting setting of the CJT CSI report.23.The wireless communication method of claim 22, wherein the aperiodic CSI trigger state comprises a one-bit indicator, wherein when the one-bit indicator is set to a first value, the CJT CSI report is determined based on delay or frequency information in the CJT calibration report associated with the CJT CSI report, and wherein when the one-bit indicator is set to a second value, the CJT CSI report is determined based on no additional delay or frequency information.24.The wireless communication method of claim 22, wherein the one of the one or more CSI-AssociatedReportConfigInfo messages comprises a one-bit indicator, wherein when the one-bit indicator is set to a first value, the wireless communication determines the CJT CSI report based on delay or frequency information in the CJT calibration report associated with the CJT CSI report, and wherein when the one-bit indicator is set to a second value, the wireless communication device determines the CJT CSI report based on no additional delay or frequency information, the second value being different from the first value.25.The wireless communication method of any of claims 9-24, wherein when the CJT calibration report comprises at least phase information, the CSI reporting configuration signaling comprises a CSI reporting setting associated with a Sounding Reference Signal (SRS) resource or a CSI-RS resources.26.The wireless communication method of claim 25, wherein a same antenna port of the communication device is used to transmit an SRS corresponding to a specific occasion of the SRS resource and receive a CSI-RS corresponding to a specific occasion of the CSI-RS resource for measuring the CJT calibration report.27.The wireless communication method of claim 26, wherein the CSI reporting configuration signaling comprises a one-bit indicator, and wherein the specific occasion of the SRS resource is determined by the one-bit indicator.28.The wireless communication method of claim 27, wherein when the one-bit indicator is set to a first value, the specific occasion of the SRS resource is a latest occasion of the SRS resource before the occasion of the CSI-RS resource for measuring the CJT calibration report.29.The wireless communication method of claim 27 or claim 28, wherein when the one-bit indicator is set to a second value, the specific occasion of the SRS resource is a latest occasion of the SRS resource before the occasion of the CSI-RS resource for measuring the CJT calibration report, or an earliest occasion of the SRS resource after the occasion of the CSI-RS resource for measuring the CJT calibration report, the second value being different from the first value.30.The wireless communication method of claim 27 or claim 29, wherein when the one-bit indicator is set to a second value, the specific occasion of the SRS resource occurs closest to the occasion of the CSI-RS resource for measuring the CJT calibration report.31.An apparatus for wireless communication comprising one or more processors, configured to cause the apparatus to implement a method recited in one or more of claims 1-30.32.A non-transitory computer readable program storage medium having code stored thereon, the code, when executed by one or more processors, causing an apparatus to implement a method recited in one or more of claims 1-30.