Systems and methods for channel state information measurement and reporting

Abstract

The present disclosure relates to methods, systems, and devices related to wireless communications, and more particularly, to methods, systems, and devices related to channel state information (CSI) measurements or CSI reporting based on different antenna ports. A wireless communication method includes receiving, by a wireless communication device, radio resource control (RRC) signaling from a network device; wherein the RRC signaling comprises at least channel state information (CSI) report configuration and CSI resource configuration; performing, by the wireless communication device, CSI reporting according to the RRC signaling; and wherein the CSI report comprises one or more CSI sub-reports.

Description

Technical Field

[0001] The present disclosure is generally directed to wireless communications. Background Art

[0002] Wireless communication technologies are driving the world towards an increasingly connected and networked society. The rapid growth of wireless communications and technological advances have led to greater demands for capacity and connectivity. Other aspects such as energy consumption, equipment cost, spectrum efficiency, and latency are also important to meet the needs of various communication scenarios. Compared to existing wireless networks, next-generation systems and wireless communication technologies need to support an increasing number of users and devices and support an increasingly mobile society. Summary of the invention

[0003] Various techniques related to channel state information reporting are disclosed, which can be implemented through embodiments in mobile communication technologies, including fifth generation (5G), new radio (NR), fourth generation (4G) and long term evolution (LTE) communication systems.

[0004] In one example aspect, a wireless communication method is disclosed. The method includes: receiving, by a wireless communication device, radio resource control (RRC) signaling from a network device; wherein the RRC signaling includes at least a channel state information (CSI) report configuration and a CSI resource configuration; performing, by the wireless communication device, CSI reporting according to the RRC signaling; and wherein the CSI report includes more than one CSI subreport.

[0005] In another example aspect, another wireless communication method is disclosed. The method includes: sending radio resource control (RRC) signaling from a network device to a wireless communication device; wherein the RRC signaling includes at least a channel state information (CSI) report configuration and a CSI resource configuration; receiving, by the wireless communication device, a CSI report according to the RRC signaling; and wherein the CSI report includes more than one CSI subreport.

[0006] In yet another exemplary aspect, the above method is embodied in the form of a computer-readable medium storing processor-executable code for implementing the method.

[0007] In yet another exemplary embodiment, a device configured or operable to perform the above method is disclosed. The device includes a processor configured to implement the method.

[0008] The above-described aspects and other aspects and embodiments thereof are described in more detail in the drawings, the description and the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 The CSI sub-reports associated with the granularity are shown.

[0010] Figure 2 An example of simulation results of reporting multiple CSIs in one report is shown.

[0011] Figure 3 Another example of simulation results of reporting multiple CSIs in one report is shown.

[0012] Figure 4 is a flow chart illustrating an example method.

[0013] Figure 5 is a flow chart illustrating an example method.

[0014] Figure 6 is an example block diagram of a wireless communication system.

[0015] Figure 7 is a flow chart of an example wireless communication method. DETAILED DESCRIPTION

[0016] Section headings are used in this application only to improve readability and do not limit the scope of the embodiments and techniques disclosed in each section to that section. Certain features are described using the example of the fifth generation (5G) wireless protocol. However, the applicability of the disclosed techniques is not limited to 5G wireless systems.

[0017] Large bandwidth, multi-antenna transmitters or receivers are used in 5G communication systems. A large number of spatial elements leads to huge power consumption. In order to reduce the power consumption of gNB, a potential method is to reduce the number of antennas or antenna ports. However, the change in the number of antennas or antenna ports may have an impact on UE CSI measurement or CSI reporting. Therefore, this application proposes a new method for channel state information (CSI) measurement or CSI reporting based on different antenna ports.

[0018] CSI Measurement: The UE (User Equipment) shall perform measurements based on CSI-RS (Reference Signal) and may report corresponding reports to the gNB.

[0019] The UE may configure one or more CSI report configurations via CSI-ReportConfig signaling. The CSI-ReportConfig will be associated with one or more CSI-RS resource settings via CSI-resourceConfigID. The CSI-RS resource settings are configured via CSI-ResourceConfig signaling.

[0020] For channel measurement, one CSI-ReportConfig is associated with only one CSI-ResourceConfig. In one CSI report, a set of CSI parameters is usually reported (a set of CSI parameters includes RI (rank indicator), CQI (channel quality indicator), PMI (precoding matrix indicator), CRI (resource indicator), L1-RSRP (layer 1 reference signal received power) or L1-SINR (layer 1 signal-to-noise ratio and interference ratio)). In Release 17, in the CSI report, the UE can report 4 pairs / groups and 2 beams per pair / group. The UE can report up to two RIs, two PMIs, two LIs (if configured), and up to two CQIs associated with resources in group 1 and resources in group 2, respectively, in one CSI report.

[0021] WidebandCQI: When wideband CQI reporting is configured, wideband CQI is reported for each codeword of the entire CSI reporting band.

[0022] SubbandCQI: When subband CQI reporting is configured, one CQI for each codeword is reported for each subband in the CSI reporting band.

[0023] The number of ports for CSI-RS is configured by nrofPorts in CSI-ResourceMapping, which is associated with NZP-CSI-RS-Resource. NZP-CSI-RS-Resource is associated with NZP-CSI-RS-ResourceSet. NZP-CSI-RS-Resource is associated with CSI-ResourceConfig. CSI-ResourceConfig is associated with CSI-ReportConfig. nrofPorts can be one of the following ports: p1, p2, p4, p8, p12, p16, p24, and p32. p32 means that the resource is configured with 32 ports.

[0024] If the number of base station antennas changes, the channel may also change. It would be helpful if the UE could provide channel measurement reports for different antenna port numbers. In the prior art, most CSI-RS resource configurations and CSI report configurations are configured through RRC (Radio Resource Control) signaling. Typically, one CSI-ReportConfig is associated with a CSI-ResourceConfig having one port number for channel measurement. This means that one CSI report only includes a report on one port number. If the UE needs to report CSI for multiple port numbers, the UE should report multiple CSIs in multiple CSI reports, and each CSI report includes a report on one port number. One CSI report requires one CSI-ReportConfig configuration. Therefore, the method requires multiple CSI-ReportConfig signaling. Since the number of CSI-ReportConfigs for one BWP is limited, it is inappropriate to configure multiple CSI-ReportConfigs to report CSI for multiple port numbers.

[0025] In the present application, a method is provided in which a UE reports multiple CRIs, RIs, CQIs or PMIs for each port associated with a reporting setting in a single reporting instance.

[0026] The UE receives RRC signaling, which includes at least CSI report configuration and CSI resource configuration. Then, CSI reporting is performed according to the RRC signaling. Different from the original CSI report, in this application, a CSI report contains more than one CSI report, which is called a CSI sub-report.

[0027] In some embodiments, each CSI sub-report reports for a different number of ports.

[0028] In some embodiments, each CSI sub-report is reported for CSI-RS resources configured with different power control offsets (powerControlOffset) or power control offsets SS (powerControlOffsetSS).

[0029] In some embodiments, each CSI sub-report is reported for a resource.

[0030] Each resource may be associated with a port number or a power offset or a time and frequency resource configuration. In some embodiments, the resource includes one or more CSI resources, and the CSI resource includes at least one of the following: a CSI resource, a CSI resource set, a CSI resource group, a CSI resource setting, and a CSI resource set group. The CSI report configuration is associated with the CSI resource configuration (CSI-resourceConfig). The CSI resource configuration corresponds to the CSI resource setting. The CSI resource setting may include one or more CSI resource sets. The CSI resource set may include one or more CSI resources. The CSI resource includes a CSI resource mapping. The CSI resource group includes one or more CSI resources. In some embodiments, the CSI resources are divided into multiple groups. The CSI resource set group includes one or more CSI resource sets. In some embodiments, the CSI resource set is divided into multiple groups.

[0031] Different resources include at least: resources with different numbers of ports, resources with different power control offsets, resources with different power control offsets SS, and resources with different time or frequency resource configurations.

[0032] In some embodiments, the first resource associated with the first CSI subreport is a subset of the second resource associated with the second CSI subreport. In some embodiments, the subset means that the time and frequency resources of the first resource are a part (or subset) of the time and frequency resources of the second resource. In some embodiments, the first resource is a subset of the second resource, which means that the number of ports associated with the first resource is less than or equal to the number of ports associated with the second resource. In some embodiments, the first resource is a subset of the second resource, which means that the power control offset associated with the first resource is greater than or equal to the power control offset associated with the second resource. In some embodiments, the first resource is a subset of the second resource, which means that the first resource overlaps with the second resource. In some embodiments, the first resource is a subset of the second resource, which means that the power control offset SS associated with the first resource is less than or equal to the power control offset SS associated with the second resource.

[0033] In each CSI subreport, multiple CSI parameters are reported. These CSI parameters include at least one of the following: channel quality indicator (CQI) (e.g., wideband CQI, subband CQI), precoding matrix indicator (PMI), CSI-RS resource indicator (CRI), rank indicator (RI), layer 1 reference signal received power (L1-RRP), L1 signal-to-noise ratio and interference ratio (SINR).

[0034] In the present application, one CSI report contains more than one CSI subreport, and the CSI subreport is jointly reported. Being jointly reported means that the same type of CSI parameters of all CSI subreports are reported together. For example, the CSI parameters include RI and CQI. Three CSI subreports are reported in one CSI report, 3 RIs are reported together, and then 3 CQIs are reported together. In some embodiments, all CSI parameters in one subreport are reported / placed together, and then the CSI parameters in another subreport are reported. In other words, the CSI parameters are reported one subreport at a time.

[0035] In this application, a CSI report contains more than one CSI report, corresponding to multiple CSI sub-reports. In this application, the power offset corresponds to powerControlOffset or powerControlOffsetSS. In this application, the number of ports refers to the number of CSI-RS ports. In this application, the power offset is referred to as the transmission power offset.

[0036] powerControlOffset t: It is the assumed ratio of PDSCH EPRE to NZP CSI-RS EPRE when the UE derives CSI feedback and takes values ​​in the range [-8,15]dB with a step size of 1dB.

[0037] powerControlOffsetSS: is the assumed ratio of NZP (non-zero power) CSI-RS EPRE to SS / PBCH (synchronization signal / physical broadcast channel) block EPRE (energy per resource element).

[0038] Multiple CSI subreports include CSI parameters for CSI resources associated with different numbers of ports or different power offsets or different resources. Therefore, the bit width of multiple CSI subreports becomes larger and more signaling overhead will be required. For example, if a CSI report includes 4 CSI subreports, the bit width increases to 4 times the original bit width. This section provides some methods to reduce CQI signaling overhead.

[0039] Wideband CQI

[0040] In some embodiments, the wideband CQI of multiple CSI subreports reported in one CSI report is reported or encoded separately. Differential or offset wideband CQI is used for reporting. The UE reports the same wideband CQI index as the UE reports the wideband CQI. In other words, the UE reports the first CSI parameter of the first CSI subreport and reports the offset value of the first CSI parameter of the second subreport, wherein the offset value is the offset between the first reference CSI parameter and the first CSI parameter of the second subreport. In this section, the first CSI parameter is the wideband CQI.

[0041] In some embodiments, the first CSI parameter of the first CSI subreport is a wideband CQI in a CSI subreport associated with a maximum number of ports or a maximum power offset or a maximum resource. The first CSI parameter of the first CSI subreport is reported directly. A wideband CQI associated with other numbers of ports or power offsets or other resources is reported via an offset wideband CQI value.

[0042] In some embodiments, the first CSI parameter of the first CSI subreport is the maximum wideband CQI index in the CSI report. In some embodiments, the maximum wideband CQI index is reported directly. The number of ports or power offset or resource associated with the maximum wideband CQI index is also indicated / reported. Wideband CQI associated with other number of ports or power offset or resource is reported via differential or offset wideband CQI value.

[0043] In some embodiments, the wideband CQI index associated with the maximum number of ports or the maximum power offset or the maximum resource is directly reported. The number of ports or the power offset or the resource associated with the wideband CQI index is also indicated / reported. The wideband CQI index associated with other number of ports or power offset or resource is reported via a differential or offset wideband CQI index.

[0044] In some embodiments, the maximum power offset refers to a maximum power control offset SS or a minimum power control offset or a maximum CSI-RS transmission power.

[0045] The differential or offset wideband CQI indicates the difference between the reference wideband CQI and the wideband CQI. The reference wideband CQI for the offset wideband CQI for the differential CSI subreport may be different.

[0046] In some embodiments, differential or offset wideband CQIs for other resources are reported in a predefined order. In some embodiments, wideband CQIs for other resources are reported in a predefined order. In some embodiments, wideband CQIs reported in one CSI report are reported in a predefined order.

[0047] Example 1: CSI report includes 3 sub-reports

[0048] The UE reports "the wideband CQI index of CSI subreport #1, the offset value of the wideband CQI index of CSI subreport #2, and the offset value of the wideband CQI index of CSI subreport #3".

[0049] The offset value of the wideband CQI index of CSI subreport #2 = the wideband CQI index of CSI subreport #1 - the wideband CQI index of CSI subreport #2

[0050] The offset value of the wideband CQI index of CSI subreport #3 = the wideband CQI index of CSI subreport #2 - the wideband CQI index of CSI subreport #3

[0051] The predefined order is one of the following orders: the order of CRIs, the order of resource IDs associated with CSI subreports, the order of resource group IDs associated with CSI subreports, the order of associated port numbers (e.g., from large to small, or from small to large), the order of associated power offsets (e.g., from large to small, or from small to large), the order configured by higher layer signaling or the predefined order, the order of port numbers / power offsets configured in the CSI report configuration. In some embodiments, each CSI subreport is associated with a CRI.

[0052] In some embodiments, the predefined order is the order of the number of associated ports. For example, the wideband CQI of the CSI subreports associated with 32, 16, 8, and 4 ports, respectively, will be reported in one CSI report. The wideband CQI of the CSI subreport associated with 32 ports is reported directly. The differential or offset wideband CQI for other numbers of ports is reported according to the following order: the differential or offset wideband CQI is associated with 16 ports, the differential or offset wideband CQI is associated with 8 ports, and the differential or offset wideband CQI is associated with 4 ports. The association of the wideband CQI with the number of ports refers to the association of the wideband CQI of the CSI subreport associated with the number of ports.

[0053] The order of port quantities or power offsets configured in the CSI report configuration refers to a sequential index that sorts each port quantity or power offset first in the order of CSI resources (e.g., NZP-CSI-RS-Resource), and then in the order of CSI resource sets (NZP-CSI-RS-ResourceSet), and then in the order of CSI resource settings (CSI-ResourceConfig) linked to the CSI report configuration.

[0054] For example, CSI-ResourceConfig includes CSI resources configured with multiple CSI resource sets. The first CSI resource set includes CSI resources configured with a first number of ports (e.g., 8 ports) and CSI resources configured with a second number of ports (e.g., 32 ports). The second CSI resource set includes CSI resources configured with a third number of ports (e.g., 16 ports) and CSI resources configured with a fourth number of ports (e.g., 24 ports). The order of the reported wideband CQI is based on the wideband CQI index of 8 ports, the bandwidth CQI index of 32 ports, the wideband CQI index of 16 ports, and the wideband CQI index of 24 ports.

[0055] In some embodiments, the reference wideband CQI is one of:

[0056] 1. Wideband CQI associated with maximum number of ports or maximum power offset or maximum resource in the same CSI report.

[0057] 2. Maximum wideband CQI index in the same CSI report. Bits need to be added to indicate which resource or number of ports or power offset the maximum wideband CQI belongs to or is associated with. In some embodiments, the added bits may indicate at least one of the following: an index / code point associated with the number of ports or a power offset or resource associated with the maximum wideband CQI index (for example, 4 wideband CQIs associated with 4 numbers of ports are reported in one CSI report). The 4 numbers of ports are 32, 24, 16, and 8. The index / code points 00, 01, 10, and 11 correspond to 32, 24, 16, and 8, respectively. Then, 2 bits are added to indicate the index / code point of the maximum wideband CQI index. Another example is that 2 wideband CQIs associated with 2 power offsets are reported in one CSI report. The 2 power offsets are -8dB and -6dB. Index / code point 0 and 1 correspond to -8dB and -6dB, respectively; CRI of the maximum wideband CQI; the index / code point indicates the position / number of associated port numbers or power offsets in all port numbers or power offsets in the CSI reporting configuration (for example, the index / code point indicates that the maximum wideband CQI is associated with the first / second / third / fourth port number, such as Figure 1 shown).

[0058] 3. Wideband CQI associated with a predefined number of ports or power offset or predefined resources.

[0059] 4. Previous wideband CQI index. The previous wideband CQI index of the Nth wideband CQI index is the (N-1)th wideband CQI index. For example, the reference wideband CQI of the Nth wideband CQI is the (N-1)th wideband CQI.

[0060] The maximum / maximum resources correspond to at least one of: resources associated with the maximum number of ports, resources associated with the maximum power offset, resources associated with time and frequency resources, which time and frequency resources are the joint (or overall) set between all resources associated with the same CSI report.

[0061] In some embodiments, the differential or offset wideband CQI index indicates a value X, which means that the wideband CQI index is X less than the reference wideband CQI index. X is an integer greater than or equal to 0 and less than 10. In some embodiments, X may be 0, 1. In some embodiments, X may be 0, 1, 2, 3. In some embodiments, X may be 0, 1, 2, 4. In other words, the wideband CQI index derived from the differential or offset wideband CQI index and the reference wideband CQI index is equal to the reference wideband CQI index - X.

[0062] In some embodiments, the differential or offset wideband CQI index indicates the number of steps (e.g., U) corresponding to the reference wideband CQI index. The step size is 1, 2, 3, or 4. The wideband CQI index derived from the differential or offset wideband CQI index is equal to the reference wideband CQI index-U*step size. U is an integer greater than or equal to 0 and less than 10.

[0063]

[0064] In the above example, 4 wideband CQI indexes need to be reported, and the wideband CQI index of the maximum number of ports is reported. Differential or offset wideband CQI indexes are used to report the wideband CQI indexes of other numbers of ports.

[0065] In Example 1, the reference wideband CQI index is the wideband CQI index of the maximum number of ports. The offset wideband CQI index indicates X, and the wideband CQI index is equal to the reference wideband CQI index - X. Therefore, wideband CQI index #2 = 15-0 = 15, wideband CQI index #3 = 15-2 = 13, and wideband CQI index #4 = 15-3 = 12.

[0066] In Example 2, the reference wideband CQI index is the wideband CQI index of the maximum number of ports. The differential or offset wideband CQI index indicates U, and the wideband CQI index is equal to the reference wideband CQI index-U*step size. Therefore, wideband CQI index #2=14-0*2=14, wideband CQI index #3=14-1*2=12, and wideband CQI index #4=14-2*2=10.

[0067] In Example 3, the reference wideband CQI index is the previous wideband CQI index. The differential or offset wideband CQI index indicates X, and the wideband CQI index is equal to the reference wideband CQI index - X. Therefore, wideband CQI index #2 = 12-0 = 12, wideband CQI index #3 = 12-0 = 11, and wideband CQI index #4 = 11-1 = 10.

[0068] In some embodiments, wideband CQI indexes for different resources or different numbers of ports or different power offsets are reported via different granularities.

[0069] This granularity can be configured through RRC signaling.

[0070] In some embodiments, only the wideband CQI index associated with the maximum number of ports or the maximum power offset or the maximum resource is reported. The wideband CQI index for other numbers of ports or power offsets or resources is the same as the wideband CQI index for the maximum number of ports or the maximum power offset.

[0071] Sub-band CQI

[0072] In some embodiments, subband CQI indices of multiple CSI subreports reported in one CSI report are reported or encoded separately. Each CSI subreport is associated with a port number or a power offset or a resource.

[0073] In some embodiments, the subband CQI index associated with the maximum number of ports or the maximum power offset or the maximum resource is reported directly. The subband CQI index associated with other number of ports or power offsets or resources is reported via a differential or offset subband CQI index. The differential or offset subband CQI index indicates the difference between the reference CQI and the subband CQI index. The reference CQI for the offset subband CQI for the differential CSI subreport may be different.

[0074] The method used to differentiate or offset the wideband CQI value can also be used to differentiate or offset the subband CQI index.

[0075] In some embodiments, the reference CQI index is one of: a wideband CQI index for a maximum number of ports or a maximum power offset, a wideband CQI index for a number of ports or a power offset or a resource that is the same as the number of ports or a power offset or a resource of a subband CQI, a subband CQI index for previous resources, the order of which may be the same as in the wideband CQI part, and a subband CQI index for a maximum number of ports or a maximum resource.

[0076] In some embodiments, only the subband CQI index associated with the maximum number of ports or the maximum power offset or the maximum resource is reported. The subband CQI index for other numbers of ports or power offsets or resources is the same as the subband CQI index for the maximum number of ports or the maximum power offset.

[0077] In some embodiments, the UE reports an offset value of a second CSI parameter of a CSI sub-report, wherein the offset value is an offset between a second reference CSI parameter and a second CSI parameter of the CSI sub-report; wherein the second CSI parameter is a subband CQI index.

[0078] In some embodiments, the second reference CSI parameter is a wideband CQI in a CSI subreport. In some embodiments, the second reference CSI parameter is a subband CQI in a CSI subreport. In some embodiments, the second reference CSI parameter is a subband CQI in a previous CSI subreport.

[0079] Example 1: CSI report includes 3 sub-reports

[0080] The UE reports "wideband CQI index of CSI subreport #1, offset value of wideband CQI index of CSI subreport #2, offset value of wideband CQI index of CSI subreport #3, offset value of subband CQI index of CSI subreport #1, offset value of subband CQI index of CSI subreport #2, offset value of subband CQI index of CSI subreport #3". Subband CQI index (i) refers to the subband CQI index of the i-th subband.

[0081] In this example, the UE reports the wideband CQI index of CSI subreport #1, and reports "the offset value of the wideband CQI index of subreport #2 and subreport #3, and the offset value of the subband CQI index of subreport #1" based on the first reference CSI parameter. The first reference CSI parameter is the wideband CQI index of CSI subreport #1. The UE also reports the offset value of the subband CQI index of subreport #2 and subreport #3 based on the second reference CSI parameter, and the second reference CSI parameter is the subband CQI index of subreport #1. Therefore, the offset value of the wideband CQI index of CSI subreport #2 = the wideband CQI index of CSI subreport #1 - the wideband CQI index of CSI subreport #2

[0082] The offset value of the wideband CQI index of CSI subreport #3 = the wideband CQI index of CSI subreport #1 - the wideband CQI index of CSI subreport #3

[0083] Offset value of subband CQI index (i) of CSI subreport #1 = wideband CQI index of CSI subreport #1 - subband CQI index (i) of CSI subreport #1

[0084] Offset value of subband CQI index (i) of CSI subreport #2 = subband CQI index (i) of CSI subreport #1 - subband CQI index (i) of CSI subreport #2

[0085] Offset value of subband CQI index (i) of CSI subreport #3 = subband CQI index (i) of CSI subreport #1 - subband CQI index (i) of CSI subreport #3

[0086] Example 2: CSI report includes 3 sub-reports

[0087] The UE reports "wideband CQI index of CSI subreport #1, offset value of wideband CQI index of CSI subreport #2, offset value of wideband CQI index of CSI subreport #3, offset value of subband CQI index of CSI subreport #1, offset value of subband CQI index of CSI subreport #2, offset value of subband CQI index of CSI subreport #3". Subband CQI index (i) represents the subband CQI index of the i-th subband.

[0088] In this example, the UE reports the wideband CQI index of CSI subreport #1, and the UE reports the offset values ​​of the wideband CQI indexes of subreport #2 and subreport #3, as well as the offset values ​​of the subband CQI indexes of subreport #1, subreport #2, and subreport #3 according to the first reference CSI parameter. The first reference CSI parameter is the wideband CQI index of CSI subreport #1. Therefore,

[0089] The offset value of the wideband CQI index of CSI subreport #2 = the wideband CQI index of CSI subreport #1 - the wideband CQI index of CSI subreport #2

[0090] The offset value of the wideband CQI index of CSI subreport #3 = the wideband CQI index of CSI subreport #1 - the wideband CQI index of CSI subreport #3

[0091] Offset value of subband CQI index (i) of CSI subreport #1 = wideband CQI index of CSI subreport #1 - subband CQI index (i) of CSI subreport #1

[0092] Offset value of subband CQI index (i) of CSI subreport #2 = wideband CQI index of CSI subreport #1 - subband CQI index (i) of CSI subreport #2

[0093] Offset value of subband CQI index (i) of CSI subreport #3 = wideband CQI index of CSI subreport #1 - subband CQI index (i) of CSI subreport #3

[0094] Example 3: CSI report includes 3 sub-reports

[0095] The UE reports "wideband CQI index of CSI subreport #1, offset value of wideband CQI index of CSI subreport #2, offset value of wideband CQI index of CSI subreport #3, offset value of subband CQI index of CSI subreport #1, offset value of subband CQI index of CSI subreport #2, offset value of subband CQI index of CSI subreport #3". Subband CQI index (i) refers to the subband CQI index of the i-th subband.

[0096] In this example, the UE reports the wideband CQI index of CSI subreport #1, and the UE reports the offset value of the wideband CQI index of subreport #2 and subreport #3 based on the first reference CSI parameter. The UE reports the offset value of the subband CQI index of subreport #1 based on the reference CSI parameter of the wideband CQI index of CSI subreport #1. The UE reports the offset value of the subband CQI index of subreport #2 and subreport #3 based on the second reference CSI parameter. The first reference CSI parameter is the previous wideband CQI index. The second reference CSI parameter is the previous subband CQI index. Therefore,

[0097] The offset value of the wideband CQI index of CSI subreport #2 = the wideband CQI index of CSI subreport #1 - the wideband CQI index of CSI subreport #2

[0098] The offset value of the wideband CQI index of CSI subreport #3 = the wideband CQI index of CSI subreport #2 - the wideband CQI index of CSI subreport #3

[0099] Offset value of subband CQI index (i) of CSI subreport #1 = wideband CQI index of CSI subreport #1 - subband CQI index (i) of CSI subreport #1

[0100] Offset value of subband CQI index (i) of CSI subreport #2 = subband CQI index of CSI subreport #1 - subband CQI index (i) of CSI subreport #2

[0101] Offset value of subband CQI index (i) of CSI subreport #3 = subband CQI index of CSI subreport #2 - subband CQI index (i) of CSI subreport #3

[0102] The maximum / maximum resources correspond to at least one of: resources associated with the maximum number of ports, resources associated with the maximum power offset, resources associated with time and frequency resources, which is the joint (or overall) set between all resources associated with the same CSI report.

[0103] In some embodiments, a portion of the subband CQI indexes are reported. For example, only the subband CQI index associated with the Mth largest wideband CQI index is reported.

[0104] Other considerations:

[0105] In some embodiments, the wideband CQIs of multiple CSI subreports reported in one CSI report are jointly encoded. In some embodiments, the joint encoding refers to using a code point to indicate the wideband CQIs of multiple CSI subreports. For example, one code point is associated with multiple predefined wideband CQI values, each of which is used for one CSI subreport. A predefined table including multiple code points and associated wideband CQI values ​​is used.

[0106] In some embodiments, joint coding refers to using a coding method to encode wideband CQI bits of multiple CSI sub-reports. Using a coding method can reduce signaling overhead.

[0107] In some embodiments, a CSI report configuration may be associated with M resources. A UE may report N CSI subreports in one CSI report. N is less than or equal to M. In some embodiments, N is configured in the CSI report configuration, and in some embodiments, N is a predefined value. In some embodiments, N is a UE capability reported by the UE.

[0108] In some embodiments, the CSI report configuration may be associated with M resources. The UE may report the best N CSI subreports in one CSI report. The best N CSI subreports in one CSI report refer to the largest N wideband CQI indexes among all subreports.

[0109] In some embodiments, more than one subband size and / or CSI-reportingBand is associated with one CSI report containing multiple CSI reports.

[0110] CSI subreports with different numbers of ports or different power offsets or different resources may be associated with different subband sizes and / or CSI-reportingBands.

[0111] For example, two subband sizes and CSI-reportingBands are configured in one CSI reporting configuration. The CSI reporting configuration is associated with more than one number of ports or more than one power offset or more than one resource. One subband size and the corresponding CSI-reportingBand are used for subband CQI subreports for the maximum number of ports or the maximum power offset or the maximum resource. Other subband sizes and corresponding CSI-reportingBands are used for other subband CQI subreports. According to the method, subband CQIs associated with different numbers of ports or different power offsets or resources are reported based on different granularities, thereby saving signaling overhead. A PDSCH with a smaller number of ports or a smaller power offset may require more resources, so coarse granularity may be sufficient.

[0112] In some embodiments, more than one cqi-BitsPerSubband is configured in one CSI report configuration. CSI subreports with different numbers of ports or different power offsets or different resources may be associated with different cqi-BitsPerSubband.

[0113] csi-ReportingBand: Indicates the subset of contiguous or non-contiguous subbands in the partial bandwidth for which CSI should be reported. Each bit in the bit string represents a subband. The rightmost bit in the bit string represents the lowest subband in the BWP.

[0114] In some embodiments, one or more CSI subreports may be associated with the same cqi-BitsPerSubband or subband size or CSI-reportingBand.

[0115] In some embodiments, different cqi-BitsPerSubband or subband sizes or CSI-reportingBands may be associated with one or more CSI subreports.

[0116] cqi-BitsPerSubband: This field can only be present when cqi-FormatIndicator is set to subbandCQI. If this field is configured with 4 bits, the UE uses 4 bits of subband CQI. If this field is not present and cqi-FormatIndicator is set to subbandCQI, the UE uses 2 bits of subband differential CQI.

[0117] like Figure 1As shown, CSI subreport #1 is associated with a first granularity, while CSI subreport #2 is associated with a second granularity. For example, the subband size associated with CSI subreport #1 is smaller than the subband size associated with CSI subreport #2. Then the number of subband CQI indexes of CSI subreport #2 is reduced, and the overhead is reduced.

[0118] In some embodiments, the CSI reporting configuration is associated with a resource. The UE reports multiple sub-reports based on the resource. The UE calculates each sub-report based on a subset of the resource (e.g., some ports, some CDM (code division multiple access) groups).

[0119] The UE also reports a subreport index which is an association or indicator of a resource subset. In some embodiments, the UE reports a port index of a subset resource. In some embodiments, the resource subset is predefined or indicated by the gNB. In some embodiments, at most 1 or 2 subreports of a resource subset are reported.

[0120] In some embodiments, multiple CSI sub-reports in a CSI report are enabled if at least one of the following conditions is met: the UE supports dynamic adaptation of gNB antenna / port; network energy saving technology is enabled / turned on; spatial network energy saving technology is enabled / turned on; the gNB indicates the start of the energy saving state; and network energy saving information is configured.

[0121] In some embodiments, a CSI resource configuration is associated with one or more CSI reporting configurations. Each CSI reporting configuration is associated with a CSI sub-report. The CSI sub-reports of the CSI reporting configurations associated with the same CSI resource configuration are reported in one CSI report.

[0122] Figure 2 An example of simulation results for reporting multiple CSIs in one report is shown. The UE measures and generates (or calculates) multiple CSIs based on CSI resources associated with different numbers of ports and reports the multiple CSIs in one report. The gNB can dynamically adjust the number of TxRUs between {64TxRU, 32TxRU, 16TxRU, 8TxRU, 4TxRU} based on the CSI report. When the gNB turns off some TxRUs, power consumption can be reduced.

[0123] According to simulation results, dynamic adaptive TxRU based on multiple CSIs in one report has up to 21.15% energy saving gain compared to the baseline scheme where the gNB always turns on 64 TxRUs.

[0124] Figure 3Another example of simulation results for reporting multiple CSI in one report is shown. The UE measures and generates multiple CSI based on CSI resources associated with different power offset configurations and reports multiple CSI in one report. The gNB can dynamically adjust the transmit power of PDSCH between {55dBm, 52dBm, 49dBm, 46dBm, 43dBm} based on the CSI report. When the gNB reduces the transmit power, power consumption can be reduced.

[0125] According to simulation results, dynamically adapting the transmit power according to multiple CSIs in one report has a maximum energy saving gain of 23.76% compared to the baseline scheme, which is that the transmit power is always 55dBm.

[0126] Therefore, some preferred embodiments may use the following solutions.

[0127] 1. If Figure 4 A wireless communication method is disclosed, comprising: receiving a radio resource control (RRC) signaling (402) from a network device by a wireless communication device; wherein the RRC signaling includes at least a channel state information (CSI) report configuration and a CSI resource configuration; performing a CSI report (404) by the wireless communication device according to the RRC signaling; and wherein the CSI report includes more than one CSI sub-report. Figures 1 to 3 Additional details and examples are discussed.

[0128] 2. The method according to solution 1, wherein each CSI subreport includes multiple CSI parameters.

[0129] 3. The method of solution 2, wherein a resource is associated with each CSI subreport of a CSI report.

[0130] 4. The method of solution 3, wherein the resource is associated with multiple CSI parameters in a CSI subreport of a CSI report.

[0131] 5. A method according to Solution 3, wherein the first resource is associated with a first CSI subreport of a CSI report; wherein the second resource is associated with a second CSI subreport of the CSI report; wherein the first resource is different from the second resource; and wherein the first resource is within a subset of the second resource.

[0132] 6. The method according to solution 4, wherein more than one CSI subreport is jointly reported; wherein the jointly reported CSI subreport contains at least one of the same CSI parameters; wherein the same CSI parameter is jointly encoded and reported immediately.

[0133] 7. A method according to Solution 2, wherein the CSI reporting performed by the wireless communication device according to the RRC signaling further includes: reporting a first CSI parameter of a first CSI sub-report; or reporting an offset value of the first CSI parameter of a second CSI sub-report; wherein the offset value is the difference between the first reference CSI parameter and the first CSI parameter of the second sub-report.

[0134] 8. The method of solution 7, wherein the CSI parameter is a wideband channel quality indicator (CQI) or a subband CQI.

[0135] 9. The method according to solution 8, wherein, when the CSI report contains at least three CSI sub-reports, the first reference CSI parameter of the first CSI parameter in the Nth CSI sub-report is the first CSI parameter in the (N-1)th CSI sub-report.

[0136] 10. The method according to solution 9, wherein N is an integer between 2 and 9.

[0137] 11. A method according to solution 8, wherein the first reference CSI parameter is at least one of the following parameters: a wideband CQI of a CSI subreport type, a wideband CQI of a CSI subreport associated with a predefined resource, a wideband CQI of a CSI subreport associated with a maximum resource, and a wideband CQI of a previous CSI subreport.

[0138] 12. A method according to solution 8, wherein the first reference CSI parameter is a maximum first CSI parameter of a CSI sub-report in a CSI report; and the report is a resource ID associated with the maximum first CSI parameter of the CSI sub-report.

[0139] 13. A method according to Solution 2, wherein the CSI reporting performed by the wireless communication device according to the RRC signaling also includes: reporting an offset value of a second CSI parameter of a CSI sub-report; wherein the offset value is a difference between a second reference CSI parameter and a second CSI parameter of the CSI sub-report; and wherein the second CSI parameter is a subband CQI index.

[0140] 14. A method according to solution 13, wherein the second reference CSI parameter is at least one of the following parameters: a wideband CQI of a CSI subreport, a wideband CQI of a CSI subreport associated with a predefined resource, a wideband CQI in a CSI subreport associated with a maximum resource, a maximum wideband CQI of a CSI subreport, a subband CQI of a CSI subreport, a subband CQI in a CSI subreport associated with a maximum resource, a subband CQI of a CSI subreport associated with a predefined resource, and a subband CQI of a previous subreport.

[0141] 15. According to the methods described in Solutions 7 and 13, the CSI parameters or offset values ​​of the CSI sub-report in the CSI report are reported or encoded according to a predefined order; wherein the predefined order is based on at least one of the following: a resource identifier (ID), a resource group ID associated with the CSI report, a number of ports, a transmission power offset, an order configured by high-layer signaling, a preconfigured order, and a number of ports or a transmission power offset indicated in the CSI report configuration.

[0142] 16. Figure 5 A wireless communication method is disclosed, comprising: sending a radio resource control (RRC) signaling (502) from a network device to a wireless communication device; wherein the RRC signaling includes at least a channel state information (CSI) report configuration and a CSI resource configuration; receiving a CSI report (504) by the wireless communication device according to the RRC signaling; and wherein the CSI report includes more than one CSI sub-report. Figures 1 to 3 Additional details and examples are discussed.

[0143] 17. The method of solution 16, wherein each CSI subreport includes multiple CSI parameters.

[0144] 18. The method of solution 17, wherein a resource is associated with each CSI subreport of a CSI report.

[0145] 19. The method of solution 18, wherein the resource is associated with multiple CSI parameters in a CSI subreport of a CSI report.

[0146] 20. A method according to solution 18, wherein the first resource is associated with a first CSI subreport of a CSI report; wherein the second resource is associated with a second CSI subreport of the CSI report; wherein the first resource is different from the second resource; and wherein the first resource is within a subset of the second resource.

[0147] 21. A method according to solution 19, wherein more than one CSI subreport is jointly reported; wherein the jointly reported CSI subreports contain at least one of the same CSI parameters; and wherein the same CSI parameters are jointly encoded and reported immediately.

[0148] 22. A method according to Solution 17, wherein receiving a CSI report by a wireless communication device according to RRC signaling further includes: receiving a first CSI parameter of a first CSI sub-report; or receiving an offset value of the first CSI parameter of a second CSI sub-report; wherein the offset value is the difference between the first reference CSI parameter and the first CSI parameter of the second sub-report.

[0149] 23. The method of solution 22, wherein the CSI parameter is a wideband channel quality indicator (CQI) or a subband CQI.

[0150] 24. A method according to solution 23, wherein, when the CSI report contains at least three CSI sub-reports, the first reference CSI parameter of the first CSI parameter in the Nth CSI sub-report is the first CSI parameter in the (N-1)th CSI sub-report.

[0151] 25. The method according to solution 24, wherein N is an integer between 2 and 9.

[0152] 26. A method according to solution 23, wherein the first reference CSI parameter is at least one of the following parameters: a wideband CQI of a CSI subreport type, a wideband CQI of a CSI subreport associated with a predefined resource, a wideband CQI of a CSI subreport associated with a maximum resource, and a wideband CQI of a previous CSI subreport.

[0153] 27. A method according to solution 23, wherein the first reference CSI parameter is the maximum first CSI parameter of a CSI sub-report in the CSI report; and the report is a resource ID associated with the maximum first CSI parameter of the CSI sub-report.

[0154] 28. A method according to Solution 17, wherein receiving the CSI report by the wireless communication device according to the RRC signaling also includes: receiving an offset value of a second CSI parameter of the CSI sub-report; wherein the offset value is the difference between the second reference CSI parameter and the second CSI parameter of the CSI sub-report; and wherein the second CSI parameter is a subband CQI index.

[0155] 29. A method according to solution 28, wherein the second reference CSI parameter is at least one of the following parameters: a wideband CQI of a CSI subreport, a wideband CQI of a CSI subreport associated with a predefined resource, a wideband CQI in a CSI subreport associated with a maximum resource, a maximum wideband CQI of a CSI subreport, a subband CQI of a CSI subreport, a subband CQI in a CSI subreport associated with a maximum resource, a subband CQI of a CSI subreport associated with a predefined resource, and a subband CQI of a previous subreport.

[0156] 30. According to the methods described in Solutions 22 and 28, the CSI parameters or offset values ​​of the CSI sub-report in the CSI report are reported or encoded according to a predefined order; wherein the predefined order is based on at least one of the following: a resource identifier (ID), a resource group ID associated with the CSI report, a number of ports, a transmission power offset, an order configured by higher-layer signaling, a preconfigured order, and a number of ports or a transmission power offset indicated in the CSI report configuration.

[0157] 31. The method according to solutions 1 and 16, wherein the CSI reporting configuration includes more than one subband size or CSI-reportingBand configuration; wherein different resources can be associated with different subband sizes or CSI-reportingBand configurations.

[0158] 32. The method according to solutions 1 and 16, wherein the CSI report configuration includes more than one CQI bits per subband (cqi-BitsPerSubband) configuration; wherein different resources can be associated with different CQI bits per subband configurations.

[0159] 33. A method according to solutions 1-4 and 16-19, wherein CSI parameters associated with different resources are reported via different granularities; wherein the different granularities can be configured or predefined via RRC signaling.

[0160] 34. A method according to solutions 3-5 and 16-18, wherein the resource is at least one of the following: a CSI resource, a CSI resource set, a CSI resource group, a CSI resource setting, and a CSI resource set group.

[0161] 35. A communication device, comprising a processor, the processor being configured to implement the method described in any one or more of solutions 1 to 34.

[0162] 36. A computer-readable medium having stored thereon codes which, when executed, cause a processor to implement the method described in any one or more of solutions 1 to 34.

[0163] Figure 6An example of a wireless communication system (e.g., Long Term Evolution (LTE), 5G, or NR cellular network) including a BS 120 and one or more user equipments (UEs) 111, 112, and 113 is shown. In some embodiments, uplink transmissions (131, 132, 133) may include uplink control information (UCI), higher layer signaling (e.g., UE assistance information or UE capabilities), or uplink information. In some embodiments, downlink transmissions (141, 142, 143) may include DCI or higher 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, etc.

[0164] Figure 7 is a block diagram representation of a portion of an apparatus according to some embodiments of the disclosed technology. An apparatus 205, such as a network device or base station or wireless device (or UE), may include a processor electronic device 210, such as a microprocessor that implements one or more techniques proposed in this application. The apparatus 205 may include a transceiver electronic device 215 for sending and / or receiving wireless signals through one or more communication interfaces (such as one or more antennas 220). The apparatus 205 may include other communication interfaces for sending and receiving data. The apparatus 205 may include one or more memories (not explicitly shown) configured to store information such as data and / or instructions. In some embodiments, the processor electronic device 210 may include at least a portion of the transceiver electronic device 215. In some embodiments, the apparatus 205 is used to implement at least some of the disclosed techniques, modules, or functions.

[0165] Some embodiments described herein are described in the 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 a computer in a networked environment. Computer-readable media may include removable and non-removable storage devices, including but not limited to read-only memory (ROM), random access memory (RAM), compact disk (CD), digital versatile disk (DVD), etc. Therefore, computer-readable media may include non-transient storage media. Typically, program modules may include routines, programs, objects, components, data structures, etc. that perform specific tasks or implement specific abstract data types. Computer or processor executable instructions, related data structures, and program modules represent examples of program codes for executing the method steps disclosed herein. A specific sequence of such executable instructions or related data structures represents an example of corresponding actions for implementing the functions described in such steps or processes.

[0166] Some disclosed embodiments can be implemented as devices or modules using hardware circuits, software or a combination thereof. For example, a hardware circuit implementation may include discrete analog and / or digital components, which are, for example, integrated as a part of a printed circuit board. Alternatively, or in addition, disclosed components or modules may be implemented as application specific integrated circuits (ASICs) and / or field programmable gate arrays (FPGAs) devices. Some embodiments may additionally or alternatively include a digital signal processor (DSP), which is a dedicated microprocessor with an architecture optimized for the operation needs of digital signal processing associated with the disclosed functions of the present application. Similarly, various components or subcomponents within each module may be implemented with software, hardware or firmware. The connection between the components within the module and / or the module may be provided using any connection method and medium known in the art, including but not limited to communication over the Internet, wired or wireless network using appropriate protocols.

[0167] Although the present application contains many details, these should not be interpreted as limitations on the scope of the claimed invention or the content that may be claimed, but as descriptions of features for specific embodiments. Certain features described in the present application in the context of separate embodiments may also be implemented in combination in a single embodiment. On the contrary, the various features described in the context of a single embodiment may also be implemented separately in multiple embodiments or in any suitable sub-combination. In addition, although the above-mentioned features may be described as working in certain combinations, and even initially claimed as such, in some cases, one or more features from the combination may be deleted from the combination, and the combination may involve a sub-combination or a variant of a sub-combination. Similarly, although the operations are described in a particular order in the accompanying drawings, this should not be understood as requiring the operations to be performed in the particular order shown or in the order of succession, or requiring the execution of all the operations shown to obtain the desired result.

[0168] 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 application.

Claims

1. A wireless communication method, comprising: Receiving, by the wireless communication device, a radio resource control (RRC) signaling from a network device; The RRC signaling includes at least a channel state information (CSI) report configuration and a CSI resource configuration; The wireless communication device performs CSI reporting according to the RRC signaling; and The CSI report includes more than one CSI sub-report.

2. The method according to claim 1, wherein: Each CSI subreport includes multiple CSI parameters.

3. The method according to claim 2, wherein: A resource is associated with each CSI subreport of the CSI report.

4. The method according to claim 3, wherein: The resource is associated with a plurality of CSI parameters in the CSI subreport of a CSI report.

5. The method according to claim 3, wherein: The first resource is associated with a first CSI subreport of the CSI report; The second resource is associated with a second CSI subreport of the CSI report; wherein the first resource is different from the second resource; and The first resource is within a subset of the second resource.

6. The method according to claim 4, wherein: The more than one CSI sub-reports are reported jointly; The jointly reported CSI subreports include at least one parameter of the same CSI parameter; and Therein, the same CSI parameters are jointly encoded and reported immediately.

7. The method according to claim 2, wherein: The performing, by the wireless communication device, CSI reporting according to the RRC signaling further includes: Reporting a first CSI parameter of a first CSI sub-report; or reporting an offset value of a first CSI parameter of a second CSI subreport; and The offset value is a difference between the first reference CSI parameter and the first CSI parameter of the second sub-report.

8. The method according to claim 7, wherein: The CSI parameter is a wideband channel quality indicator (CQI) or a subband CQI.

9. The method according to claim 8, wherein: When the CSI report includes at least three CSI sub-reports, the first reference CSI parameter of the first CSI parameter in the Nth CSI sub-report is the first CSI parameter in the (N-1)th CSI sub-report.

10. The method according to claim 9, wherein: N is an integer between 2 and 9.

11. The method according to claim 8, wherein: The first reference CSI parameter is at least one of the following parameters: a wideband CQI of a CSI subreport type, a wideband CQI of a CSI subreport associated with a predefined resource, a wideband CQI of a CSI subreport associated with a maximum resource, and a wideband CQI of a previous CSI subreport.

12. The method according to claim 8, wherein: The first reference CSI parameter is a maximum first CSI parameter of a CSI subreport in the CSI report; and Report a resource ID associated with the maximum first CSI parameter of the CSI subreport.

13. The method according to claim 2, wherein: The performing, by the wireless communication device, CSI reporting according to the RRC signaling further includes: Report an offset value of a second CSI parameter of a CSI sub-report; wherein the offset value is a difference between a second reference CSI parameter and a second CSI parameter of the CSI subreport; and The second CSI parameter is a subband CQI index.

14. The method according to claim 13, wherein: The second reference CSI parameter is at least one of the following parameters: a wideband CQI of a CSI subreport, a wideband CQI of a CSI subreport associated with a predefined resource, a wideband CQI in a CSI subreport associated with a maximum resource, a maximum wideband CQI of a CSI subreport, a subband CQI of a CSI subreport, a subband CQI in a CSI subreport associated with a maximum resource, a subband CQI of a CSI subreport associated with a predefined resource, and a subband CQI of a previous subreport.

15. The method according to claims 7 and 13, wherein the CSI parameters or offset values ​​of the CSI sub-reports in the CSI report are reported or encoded according to a predefined order; and in, The predefined order is based on at least one of: a resource identifier (ID), a resource group ID associated with the CSI report, a number of ports, a transmission power offset, an order configured by higher layer signaling, a preconfigured order, and a number of ports or a transmission power offset indicated in the CSI report configuration.

16. A wireless communication method, comprising: sending radio resource control (RRC) signaling from the network device to the wireless communication device; The RRC signaling includes at least a channel state information (CSI) report configuration and a CSI resource configuration; receiving, by the wireless communication device, a CSI report according to the RRC signaling; and The CSI report includes more than one CSI sub-report.

17. The method according to claim 16, wherein: Each CSI subreport includes multiple CSI parameters.

18. The method according to claim 17, wherein: A resource is associated with each CSI subreport of the CSI report.

19. The method according to claim 18, wherein: The resource is associated with a plurality of CSI parameters in the CSI subreport of a CSI report.

20. The method according to claim 18, wherein: The first resource is associated with a first CSI subreport of the CSI report; The second resource is associated with a second CSI subreport of the CSI report; wherein the first resource is different from the second resource; and The first resource is within a subset of the second resource.

21. The method according to claim 19, wherein: The more than one CSI sub-reports are reported jointly; The jointly reported CSI subreports include at least one parameter of the same CSI parameter; and Therein, the same CSI parameters are jointly encoded and reported immediately.

22. The method according to claim 17, wherein: Receiving, by the wireless communication device, a CSI report according to the RRC signaling further includes: receiving a first CSI parameter of a first CSI subreport; or receiving an offset value of a first CSI parameter of a second CSI subreport; and The offset value is a difference between the first reference CSI parameter and the first CSI parameter of the second sub-report.

23. The method according to claim 22, wherein: The CSI parameter is a wideband channel quality indicator (CQI) or a subband CQI.

24. The method according to claim 23, wherein: When the CSI report includes at least three CSI sub-reports, the first reference CSI parameter of the first CSI parameter in the Nth CSI sub-report is the first CSI parameter in the (N-1)th CSI sub-report.

25. The method according to claim 24, wherein: N is an integer between 2 and 9.

26. The method of claim 23, wherein: The first reference CSI parameter is at least one of the following parameters: a wideband CQI of a CSI subreport type, a wideband CQI of a CSI subreport associated with a predefined resource, a wideband CQI of a CSI subreport associated with a maximum resource, and a wideband CQI of a previous CSI subreport.

27. The method according to claim 23, wherein: The first reference CSI parameter is a maximum first CSI parameter of a CSI subreport in the CSI report; and Report a resource ID associated with the maximum first CSI parameter of the CSI subreport.

28. The method of claim 17, wherein: Receiving, by the wireless communication device, a CSI report according to the RRC signaling further includes: receiving an offset value of a second CSI parameter of a CSI subreport; wherein the offset value is a difference between a second reference CSI parameter and a second CSI parameter of the CSI subreport; and The second CSI parameter is a subband CQI index.

29. The method according to claim 28, wherein: The second reference CSI parameter is at least one of the following parameters: a wideband CQI of a CSI subreport, a wideband CQI of a CSI subreport associated with a predefined resource, a wideband CQI in a CSI subreport associated with a maximum resource, a maximum wideband CQI of a CSI subreport, a subband CQI of a CSI subreport, a subband CQI in a CSI subreport associated with a maximum resource, a subband CQI of a CSI subreport associated with a predefined resource, and a subband CQI of a previous subreport.

30. The method according to claims 22 and 28, wherein the CSI parameters or offset values ​​of the CSI sub-report in the CSI report are reported or encoded according to a predefined order; and in, The predefined order is based on at least one of: a resource identifier (ID), a resource group ID associated with the CSI report, a number of ports, a transmission power offset, an order configured by higher layer signaling, a preconfigured order, and a number of ports or a transmission power offset indicated in the CSI report configuration.

31. The method according to claims 1 and 16, wherein: The CSI reporting configuration includes more than one subband size or CSI-reportingBand configuration; and Among them, different resources can be associated with different sub-band sizes or CSI-reportingBand configurations.

32. The method according to claims 1 and 16, wherein: The CSI report configuration includes one or more CQI bits per subband (cqi-BitsPerSubband) configurations; and Among them, different resources can be associated with different per-subband CQI bit configurations.

33. The method of claims 1-4 and 16-19, wherein: CSI parameters associated with different resources are reported via different granularities; and The different granularities can be configured or predefined through the RRC signaling.

34. The method according to claims 3-5 and 16-18, wherein: The resource is at least one of: a CSI resource, a CSI resource set, a CSI resource group, a CSI resource setting, and a CSI resource set group.

35. A communication device comprising a processor configured to implement the method according to any one or more of claims 1 to 34.

36. A computer readable medium having stored thereon code which, when executed, causes a processor to implement the method according to any one or more of claims 1 to 34.

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