WO2023044630A1

WO2023044630A1 - User equipment, base station, and method for channel state information (csi) measurement

Info

Publication number: WO2023044630A1
Application number: PCT/CN2021/119717
Authority: WO
Inventors: Tian LI; Jia SHENG
Original assignee: Huizhou Tcl Cloud Internet Corporation Technology Co., Ltd
Priority date: 2021-09-22
Filing date: 2021-09-22
Publication date: 2023-03-30

Abstract

A user equipment (UE) executes method for channel state information (CSI) measurement. The UE determines a sequence of port indices of a CSI-RS resource from a first TRP according to a CSI report configuration to obtain port indices for the first TRP, and a sequence of port indices of a CSI-RS resource from a second TRP according to the CSI report configuration to obtain port indices for the second TRP. The UE performs CSI measurement for the first TRP using the port indices for the first TRP and CSI measurement for the second TRP using port indices for the second TRP. The UE reports the CSI measurement for the first TRP and the CSI measurement for the second TRP.

Description

USER EQUIPMENT, BASE STATION, AND METHOD FOR CHANNEL STATE INFORMATION (CSI) MEASUREMENT

Technical Field

The present disclosure relates to the field of multiple input multiple output (MIMO) wireless communication systems, and more particularly, to user equipment and a method for CSI measurement and report.

Background Art

Wireless communication systems, such as the third-generation (3G) of mobile telephone standards and technology are well known. Such 3G standards and technology have been developed by the Third Generation Partnership Project (3GPP) . The 3rd generation of wireless communications has generally been developed to support macro-cell mobile phone communications. Communication systems and networks have developed towards being a broadband and mobile system. In cellular wireless communication systems, user equipment (UE) is connected by a wireless link to a radio access network (RAN) . The RAN comprises a set of base stations (BSs) that provide wireless links to the UEs located in cells covered by the base station, and an interface to a core network (CN) which provides overall network control. As will be appreciated, the RAN and CN each conduct respective functions in relation to the overall network. The 3rd Generation Partnership Project has developed the so-called Long Term Evolution (LTE) system, namely, an Evolved Universal Mobile Telecommunication System Territorial Radio Access Network, (E-UTRAN) , for a mobile access network where one or more macro-cells are supported by a base station known as an eNodeB or eNB (evolved NodeB) . More recently, LTE is evolving further towards the so-called 5G or NR (new radio) systems where one or more cells are supported by a base station known as a gNB.

To exploit multiple path propagation, multi-input multi-output (MIMO) is a method for multiplying the capacity of a radio link using multiple transmitting antennas and multiple receiving antennas deployed at a transmitter and a receiver. MIMO is a practical technique that improves spectral efficiency by sending and receiving multiple data streams simultaneously over the same radio channel. A UE can be equipped with multiple panel entities (i.e., transmission/reception points, TRPs) of which one or multiple panel entities can be activated at a time.

Technical Problem

When a UE is configured with channel state information (CSI) feedback without precoding matrix indicator (PMI) , if a subset of ports in a CSI reference signal (CSI-RS) resource can be semi-statically configured for a rank hypothesis for CSI measurement, there can be no mismatch between the precoding that is assumed for CSI calculation and the precoding that is used for physical downlink shared channel (PDSCH) transmission. Hence, port indices configuration should be indicated for UE and base station.

Without knowledge of radio interference at the UE, a gNB cannot perfectly determines rank solely based on the UL channel measurement. Hence, a gNB should transmit precoded CSI-RS resources to a UE, and the UE achieves better link adaptation based on the indicated port indices of CSI-RS resources.

If the uplink control information (UCI) payload can be reduced through CSI sharing, including rank indicator (RI) and channel quality indicator (CQI) . Hence, it is essential to design CSI sharing mechanism.

An enhanced method is desired to address the potential issues for non-PMI based CSI measurement and reporting in multi-TRP/panel non-coherent joint transmission (NCJT) measurement hypothesis.

Technical Solution

An object of the present disclosure is to propose a user equipment, a base station, and a method for CSI measurement.

In a first aspect, an embodiment of the invention provides an uplink configuration method, executable in a user equipment (UE) , comprising:

determining a sequence of port indices of a CSI-RS resource from a first TRP according to a CSI report configuration to obtain port indices for the first TRP, wherein the sequence of the port indices of the CSI-RS resource from the first TRP is configured;

determining a sequence of port indices of a CSI-RS resource from a second TRP according to the CSI report configuration to obtain port indices for the second TRP, wherein the sequence of the port indices of the CSI-RS resource from the second TRP is configured;

performing CSI measurement for the first TRP using the port indices for the first TRP and CSI measurement for the second TRP using port indices for the second TRP; and

reporting the CSI measurement for the first TRP and the CSI measurement for the second TRP.

In a second aspect, an embodiment of the invention provides a user equipment (UE) comprising a processor, configured to call and run a computer program stored in a memory, to cause a device in which the chip is installed to execute the disclosed method.

In a third aspect, an embodiment of the invention provides uplink configuration method, executable in a user equipment (UE) , comprising:

transmitting a CSI report configuration to a user equipment (UE) through a downlink, wherein the CSI report configuration comprises a sequence of port indices of a CSI-RS resource from a first TRP among port indices for the first TRP, the sequence of the port indices of the CSI-RS resource from the first TRP is configured, the CSI report configuration comprises a sequence of port indices of a CSI-RS resource from a second TRP among port indices for the second TRP, and the sequence of the port indices of the CSI-RS resource from the second TRP is configured; and receiving CSI measurement for the first TRP that is based on the port indices for the first TRP and CSI measurement for the second TRP that is based on the port indices for the second TRP.

In a fourth aspect, an embodiment of the invention provides a base station comprising a processor, configured to call and run a computer program stored in a memory, to cause a device in which the chip is installed to execute the disclosed method.

The disclosed method may be implemented in a chip. The chip may include a processor, configured to call and run a computer program stored in a memory, to cause a device in which the chip is installed to execute the disclosed method.

The disclosed method may be programmed as computer-executable instructions stored in a non-transitory computer readable medium. The non-transitory computer-readable medium, when loaded to a computer, directs a processor of the computer to execute the disclosed method.

The non-transitory computer-readable medium may comprise at least one from a group consisting of: a hard disk, a CD-ROM, an optical storage device, a magnetic storage device, a Read-Only Memory, a Programmable Read Only Memory, an Erasable Programmable Read-Only Memory, EPROM, an Electrically Erasable Programmable Read Only Memory and a Flash memory.

The disclosed method may be programmed as a computer program product, that causes a computer to execute the disclosed method.

The disclosed method may be programmed as a computer program, that causes a computer to execute the disclosed method.

Advantageous Effects

The disclosed method provides improvement to non-PMI based CSI measurement and reporting in multi-TRP/panel NCJT measurement hypothesis, including:

● port indices configuration;

● CSI measurement and report; and

● CSI sharing.

Description of Drawings

In order to more clearly illustrate the embodiments of the present disclosure or related art, the following figures will be described in the embodiments are briefly introduced. It is obvious that the drawings are merely some embodiments of the present disclosure, a person having ordinary skill in this field can obtain other figures according to these figures without paying the premise.

FIG. 1 illustrates a schematic view showing an example of multi-TRP/panel SRS transmission and multi-TRP/panel CSI-RS transmission.

FIG. 2 illustrates a schematic view showing an example of single-TRP/panel SRS transmission and single-TRP/panel CSI-RS transmission.

FIG. 3 illustrates a schematic view of a telecommunication system.

FIG. 4 illustrates a schematic view showing an embodiment of the disclosed method for CSI measurement.

FIG. 5 illustrates a schematic view showing an example of sequences of port indices for the two TRPs.

FIG. 6 illustrates a schematic view showing an example of sequences of port indices for the two TRPs.

FIG. 7 illustrates a schematic view showing an example of sequences of port indices for the two TRPs.

FIG. 8 illustrates a schematic view showing an example of sequences of port indices for the two TRPs.

FIG. 9 illustrates a schematic view showing an example of indicated port indices for the two TRPs.

FIG. 10 illustrates a schematic view showing a system for wireless communication according to an embodiment of the present disclosure.

DETAILED DESCRIPTION OF EMBODIMENTS

Embodiments of the disclosure are described in detail with the technical matters, structural features, achieved objects, and effects with reference to the accompanying drawings as follows. Specifically, the terminologies in the embodiments of the present disclosure are merely for describing the purpose of the certain embodiment, but not to limit the disclosure.

Multi-TRP/panel based SRS and CSI-RS transmission:

The main idea of this disclosure is to provide a method for non-PMI based feedback mechanism, through which a transmitter, such as a UE, is allowed to apply the non-PMI based CSI measurement and reporting in multi-TRP/panel NCJT measurement hypothesis.

In this disclosure, several solutions are proposed to apply the non-PMI based CSI measurement and reporting in multi-TRP/panel NCJT measurement hypothesis, which include port index configuration, CSI measurement and reporting, CSI sharing between single-TRP and multi-TRP measurement hypotheses. First of all, regarding port index configuration, several methods are disclosed to indicate port indices according to the non-PMI port indication parameter. Secondly, regarding CSI measurement and reporting, RI and CQI is calculated based on the indicated port indices. Thirdly, regarding CSI sharing between single-TRP and multi-TRP measurement, a method for RI sharing and CQI sharing is provided to reduce the UCI overhead. Taking these methods into consideration, the support for the non-PMI based CSI measurement and reporting in multi-TRP/panel NCJT measurement hypothesis is greatly enhanced.

As shown in the FIG 1 (a) , for a UE 10b operating in multi-TRP/panel transmission in NR, SRS can be transmitted in different transmission occasions toward a first TRPs 100_1 and a second TRP 100_2 so that the UE 10b has multiple chances to transmit SRS. Additionally, multiple SRS can be transmitted from

multiple panels

41, 42, and 43 simultaneously toward multiple TRPs 100_1 and 100_2. SRS transmission targeting towards different TRPs can avoid possible blockage between a single TRP and the UE. As a result, SRS transmission towards multiple TRPs not only enhance the reliability but also improve the coverage.

As shown in the FIG. 1 (b) , for the UE 10b operating in multi-TRP/panel transmission in NR, CSI-RS can be transmitted from different TRPs 100_1 and 100_2 so that a base station, such as a gNB, has multiple chances to transmit CSI-RS. Additionally, multiple CSI-RS can be received from

multiple panels

41, 42, and 43 simultaneously. CSI-RS transmission transmitted from multiple TRPs not only enhance the reliability but also improve the coverage.

As shown in the FIG. 2 (a) , for a UE 10b operating in single-TRP/panel transmission in NR, SRS can be transmitted from a panel, such as one of the

panel

41, 42, or 43, toward the first TRP 100_1. As only one panel is activated, the transmitted power can be saved. Additionally, it can simplify the detection in the gNB. As shown in the FIG. 2 (b) , for the UE 10b operating in single-TRP transmission in NR, CSI-RS is transmitted from the single TRP 100_1 to the UE 10b.

Since both uplink and downlink share the same frequency band in a time-division duplex (TDD) system, channel reciprocity is an important advantage of a TDD system, in which a base station, such as a gNB, can obtain the downlink CSI based on the uplink channel estimation without additional feedback. Thus, the overhead and delay of CSI feedback can be greatly reduced especially in a multi-input multi-output (MIMO) system configured with multiple antennas. For non-PMI based CSI measurement and reporting, channel reciprocity plays an import role in CSI acquisition. In this field of technique, the UE transmits SRS to two TRPs and then gNB can determine the best precoder for CSI-RS transmission of each TRP link according to the channel measurement based on SRS.

This invention proposes some methods to enhance non-PMI based CSI measurement and reporting in multi-TRP/panel NCJT measurement hypothesis.

With reference to FIG. 3, an example of the UE 10b in the description may include UE 10a. An example of the base station in the description may include

base station

20a or 20b. A first TRP and a second TRP in the description may comprise two radio nodes. The two radio nodes may be connected to one base station or two different base stations. Uplink (UL) transmission of a control signal or data may be a transmission operation from a UE to a base station. Downlink (DL) transmission of a control signal or data may be a transmission operation from a base station to a UE.

With reference to FIG. 3, a telecommunication system including a UE 10a, a base station 20a, a base station 20b, and a network entity device 30 executes the disclosed method according to an embodiment of the present disclosure. FIG. 3 is shown for illustrative not limiting, and the system may comprise more UEs, BSs, and CN entities. Connections between devices and device components are shown as lines and arrows in the FIGs. The UE 10a may include a processor 11a, a memory 12a, and a transceiver 13a. The base station 20a may include a processor 21a, a memory 22a, and a transceiver 23a. The base station 20b may include a processor 21b, a memory 22b, and a transceiver 23b. The network entity device 30 may include a processor 31, a memory 32, and a transceiver 33. Each of the

processors

11a, 21a, 21b, and 31 may be configured to implement proposed functions, procedures, and/or methods described in this description. Layers of radio interface protocol may be implemented in the

processors

11a, 21a, 21b, and 31. Each of the

memory

12a, 22a, 22b, and 32 operatively stores a variety of programs and information to operate a connected processor. Each of the

transceivers

13a, 23a, 23b, and 33 is operatively coupled with a connected processor, transmits and/or receives a radio signal. Each of the

base stations

20a and 20b may be an eNB, a gNB, or one of other radio nodes.

Each of the

processors

11a, 21a, 21b, and 31 may include a general-purpose central processing unit (CPU) , application-specific integrated circuits (ASICs) , other chipsets, logic circuits and/or data processing devices. Each of the

memory

12a, 22a, 22b, and 32 may include read-only memory (ROM) , a random access memory (RAM) , a flash memory, a memory card, a storage medium and/or other storage devices. Each of the

transceivers

13a, 23a, 23b, and 33 may include baseband circuitry and radio frequency (RF) circuitry to process radio frequency signals. When the embodiments are implemented in software, the techniques described herein can be implemented with modules, procedures, functions, entities and so on, that perform the functions described herein. The modules can be stored in a memory and executed by the processors. The memory can be implemented within a processor or external to the processor, in which those can be communicatively coupled to the processor via various means are known in the art.

The network entity device 30 may be a node in a CN. CN may include LTE CN or 5GC which may include user plane function (UPF) , session management function (SMF) , mobility management function (AMF) , unified data management (UDM) , policy control function (PCF) , control plane (CP) /user plane (UP) separation (CUPS) , authentication server (AUSF) , network slice selection function (NSSF) , and the network exposure function (NEF) .

One or more CSI-RS resources from a TRP, such as one of the first TRP or the second TRP, means One or more CSI-RS resources configured by and transmitted in a configuration from the TRP.

Port index configuration:

When a UE is configured with CSI feedback without PMI, if a subset of ports in a CSI-RS resource can be semi-statically configured for a rank hypothesis for CSI measurement, there is no mismatch between the precoding that is assumed for CSI calculation and the precoding that is used for PDSCH transmission. That is, the gNB applies the same precoding for PDSCH as for CSI-RS.

With reference to FIG. 4, a base station 20, such as the

base station

20a or 20b, transmits (210) CSI report configuration to UE 10 through a downlink signal, such as radio resource control (RRC) signaling. The CSI report configuration comprises CSI-RS resources from a first TRP, such as the first TRP 100_1, and CSI-RS resources from a second TRP, such as the second TRP 100_2. The CSI report configuration comprises a sequence of port indices of a CSI-RS resource from the first TRP among port indices for the first TRP. The sequence of the port indices of the CSI-RS resource from the first TRP is configured. The CSI report configuration comprises a sequence of port indices of a CSI-RS resource from the second TRP among port indices for the second TRP. The sequence of the port indices of the CSI-RS resource from the second TRP is configured.

A UE 10, such as the UE 10a or the UE 10b, determines the sequence of port indices of the CSI-RS resource from the first TRP according to the CSI report configuration to obtain port indices for the first TRP (212) . The sequence of the port indices of the CSI-RS resource from the first TRP is configured. The port indices of one or more of CSI-RS resources from the first TRP may be referred to as port indices for the first TRP.

The UE determines the sequence of port indices of the CSI-RS resource from the second TRP according to the CSI report configuration to obtain port indices for the second TRP (212) . The sequence of the port indices of the CSI-RS resource from the second TRP is configured. The port indices of one or more the CSI-RS resources from the second TRP may be referred to as port indices for the second TRP.

The UE performs CSI measurement for the first TRP using the port indices for the first TRP and CSI measurement for the second TRP using port indices for the second TRP (214) .

The UE reports the CSI measurement for the first TRP and the CSI measurement for the second TRP (216) . The base station 20 receives the CSI measurement for the first TRP and the CSI measurement for the second TRP (218) . The CSI measurement for the first TRP is based on the port indices for the first TRP, and the CSI measurement for the second TRP is based on the port indices for the second TRP

An example of the CSI report configuration comprises a CSI-ReportConfig information element. An example of the CSI-ReportConfig information element in technical specification (TS) 38.331 is shown in following:

Table 1: CSI-ReportConfig information element

Presence of higher layer parameter of non-PMI port indication:

One higher layer parameter of non-PMI port indication:

Based on a set of offset values:

If only one higher layer parameter of non-PMI port indication parameter (e.g., non-PMI-PortIndication) is configured in the CSI report configuration, the port indices of the CSI-RS resource from the first TRP can be configured in the non-PMI port indication parameter (e.g., non-PMI-PortIndication) and a set of offset values can be indicated to determine the port indices of the CSI-RS resource from the second TRP. Thus, the port indices can be configured with less RRC overhead.

In an embodiment of the invention, for non-PMI based CSI measurement and reporting in multi-TRP/panel scenario, if a UE, such as the

UE

10, 10a, or 10b, is configured with a CSI report configuration (e.g., higher layer parameter CSI-ReportConfig) with the report quantity (e.g., higher layer parameter reportQuantity) set to 'cri-RI-CQI' , the sequence of port indices of the CSI-RS resource from the first TRP can be configured in the non-PMI port indication parameter (e.g., non-PMI-PortIndication) and the sequence of port indices of the CSI-RS resource from the second TRP can be determined based on the sequence of port indices for the first TRP and RI _max offset values, where the offset values are provided per rank, and the offset values can be pre-defined or signaled by DCI, MAC CE, or RRC, and RI _max=min (8, P) , and P is the number of ports in the CSI-RS resource.

In detail, the non-PMI port indication parameter (e.g., non-PMI-PortIndication) determines a sequence of port indices for the first TRP, where the port indices are selected from the CSI-RS resource configured and transmitted from the first TRP. Regarding the sequence of port indices for the first TRP, the port indices of CSI-RS resources transmitted from the first TRP can be configured and the port indices for each CSI-RS resource are configured based on order arrangement of an associated CSI-RS resource index (e.g., higher layer parameter NZP-CSI-RS-ResourceId) of in linked CSI resource setting indicated by resources for channel measurement parameter (e.g., higher layer parameter resourcesForChannelMeasurement) linked to the CSI report configuration, where the CSI-RS resources are transmitted from the first TRP. In the port indices for each CSI-RS resource, port indices of m ports are indicated in order arrangement of layer ordering for rank m, i.e., the port indices of the m port are indicated as:

where

are the CSI-RS port indices of the m port for rank m, and R∈ {1, 2, …, RI _max} , and RI _max=min (8, P) , and P is the number of ports in the CSI-RS resource.

NZP-CSI-RS-Resource information element is shown in following:

Table 2: NZP-CSI-RS-Resource information element

NZP-CSI-RS-ResourceId information element is shown in following:

Table 3: NZP-CSI-RS-ResourceId information element

For the CSI-RS resource from the second TRP that is configured in the CSI resource setting linked to the CSI report configuration (e.g., CSI-ReportConfig) , the port indices (i.e.,

) for rank m are

where, offset _(m-1) is an offset associated with rank m, rank m=1, 2, …, RI _max, and RI _max=min (8, P) , and P is the number of ports in the CSI-RS resource. In a special case, if a number RI _max of offsets are the same value, it is equivalent to indicate a single offset value. More specially, if the RI _max offset values are equal to 0, it means that for a rank, port indices of CSI-RS resources from two TRPs are the same.

Two set of port indices configured in the non-PMI port indication parameter:

If only one higher layer parameter of non-PMI port indication parameter (e.g., non-PMI-PortIndication) is configured in the CSI report configuration, port indices of a CSI-RS resource from the first TRP and port indices of a CSI-RS resource from the second TRP can be configured in the same non-PMI port indication parameter (e.g., non-PMI-PortIndication) . Additionally, the port indices for the same rank for CSI-RS resources from different TRPs may be the same. Thus, the port indices can be configured with less RRC overhead and less flexibility.

In an embodiment of the invention, for non-PMI based CSI measurement and reporting in multi-TRP/panel scenario, if the UE is configured with a CSI report configuration (e.g., higher layer parameter CSI-ReportConfig) with the report quantity (e.g., higher layer parameter reportQuantity) set to 'cri-RI-CQI' , the sequence of port indices corresponding to at least 2 CSI-RS resources can be configured in the non-PMI port indication parameter (e.g., non-PMI-PortIndication) . For example, if the number of the configured CSI-RS resource is 2, the port indices is configured for a CSI-RS resource from the first and a CSI-RS resource from second TRPs respectively. That is, the sequence of the port indices of the CSI-RS resource from the first TRP and the sequence of the port indices of the CSI-RS resource from the second TRP are configured in the non-PMI port indication parameter (e.g., non-PMI-PortIndication) .

(1) Port indices is configured based on the order of resource index

If the port indices of CSI-RS from the two TRPs is configured based on order arrangement of the associated CSI-RS resource index (e.g., higher layer parameter NZP-CSI-RS-ResourceId) in the linked CSI resource setting indicated by resources for channel measurement parameter (e.g., higher layer parameter resourcesForChannelMeasurement) , there will be less spec impact.

The non-PMI port indication parameter (e.g., non-PMI-PortIndication) determines a sequence of port indices for the first and second TRP, where the port indices for the first TRP are selected from the CSI-RS resource transmitted from the first TRP and the port indices for the second TRP are selected from the CSI-RS resource transmitted from the second TRP.

Regarding the sequence of port indices, the port indices of at least 2 CSI-RS resources can be configured and the port indices for each CSI-RS resource are configured based on order arrangement of the associated CSI-RS resource index (e.g., higher layer parameter NZP-CSI-RS-ResourceId) in the linked CSI resource setting indicated by resources for channel measurement parameter (e.g., higher layer parameter resourcesForChannelMeasurement) linked to the CSI report configuration, where port indices of the CSI-RS resources from the first and second TRP are configured in a single sequence. In the port indices for each CSI-RS resource, port indices of m ports are indicated in arrangement of layer ordering for rank m, i.e., the port indices of the m port are indicated as:

where

are the CSI-RS port indices for rank m, and R∈ {1, 2, …, RI _max} , and RI _max=min (8, P) , and P is the number of ports in the CSI-RS resource.

In an example, non-PMI port indication parameter (e.g., non-PMI-PortIndication) may comprise one or up to K1 instances of the higher layer parameter of port index for eight ranks parameter (e.g., PortIndexFor8Ranks) for the first TRP and one or up to K2 instances of the higher layer parameter of port index for eight ranks parameter (e.g., PortIndexFor8Ranks) for the second TRP. An example of the detailed sequence of port indices for the first and second TRP is shown in the following:

Table 4:

Port indices are represented by parameters of PortIndex2, PortIndex4, or PortIndex8 in the portIndex2, portIndex4, or portIndex8. Parameters portIndex2, portIndex4, and portIndex8 are included in parameter PortIndexFor8Ranks.

As shown in FIG. 5, the number of ports of the first and second CSI-RS resources is 8, i.e., a variable of port index p _i, where i=0, 1, …, or 7. For the two CSI-RS resources, the indicated port indices are the same for the same rank. For example, regarding rank4, the indicated port indices of the first and second CSI-RS resources are p ₀,p ₁, p ₂, p ₃. Since the precoder for first and second CSI-RS resources may be different, UE can select the ports of different rank according to the channel condition.

(2) Port indices is configured based on two groups:

Since the non-PMI port indication parameter (e.g., non-PMI-PortIndication) determines a sequence of port indices, if the sequence of port indices is divided into two groups and each group of port indices corresponds to the CSI-RS resources from a separate TRP, UE can derive the port indices for the two TRPs easily.

In an embodiment of the invention, for non-PMI based CSI measurement and reporting in multi-TRP/panel scenario, the non-PMI port indication parameter (e.g., non-PMI-PortIndication) determines a combined sequence of port indices, and the sequence of port indices is divided into two groups, including a first group and a second group, where the first group of port indices corresponds to the CSI-RS resources from the first TRP, and the second group of port indices corresponds to the CSI-RS resources from the second TRP. That is, the first group of port indices comprises the sequence of the port indices of the CSI-RS resource from the first TRP and the second group of port indices comprises the sequence of the port indices of the CSI-RS resource from the second TRP.

For the first group of port indices for the first TRP, the port indices of up to K1 CSI-RS resources can be configured, and the port indices for each CSI-RS resource are configured based on order arrangement of the associated CSI-RS resource index (e.g., higher layer parameter NZP-CSI-RS-ResourceId) in the linked CSI resource setting indicated by resources for channel measurement parameter (e.g., higher layer parameter resourcesForChannelMeasurement) linked to the CSI report configuration, where the CSI-RS resources are transmitted from the first TRP.

For the second group of port indices for the second TRP, the port indices of up to K2 CSI-RS resources can be configured, and the port indices for each CSI-RS resource are configured based on order arrangement of the associated CSI-RS resource index (e.g., higher layer parameter NZP-CSI-RS-ResourceId) in the linked CSI resource setting indicated by resources for channel measurement parameter (e.g., higher layer parameter resourcesForChannelMeasurement) linked to the CSI report configuration, where the CSI-RS resources are transmitted from the second TRP.

In the port indices for each CSI-RS resource, port indices of m ports are indicated in arrangement of layer ordering for rank m, i.e., the port indices of the m port are indicated as:

where

Two higher layer parameters of non-PMI port indication:

If two higher layer parameters of non-PMI port indication parameter (e.g., non-PMI-PortIndication) are configured and each corresponds to the CSI-RS resource transmitted from a separate TRP, port indication of different CSI-RS resources from different TRPs can be configured freely.

One higher layer parameter of port index for eight ranks:

In an embodiment, the CSI report configuration comprises a non-PMI-PortIndication1 and a non-PMI-PortIndication2.

If only one higher layer parameter of port index for eight ranks parameter (e.g., PortIndexFor8Ranks) is configured, the port indices of the CSI-RS resource from the first and the port indices of the CSI-RS resource from second TRPs can be configured in a first non-PMI port indication parameter (e.g., non-PMI-PortIndication) and second non-PMI port indication parameter (e.g., non-PMI-PortIndication) respectively. That is, the sequence of the port indices of the CSI-RS resource from the first TRP may be configured in the first non-PMI port indication parameter (e.g., non-PMI-PortIndication) , and the sequence of the port indices of the CSI-RS resource from the second TRP may be configured in the second non-PMI port indication parameter (e.g., non-PMI-PortIndication) . The port indices for the same rank for CSI-RS resources from different TRPs are the same. Thus, the port indices of CSI-RS resource from different TPRs can be configured flexibly and saved RRC overhead.

In an embodiment of the invention, for non-PMI based CSI measurement and reporting in multi-TRP/panel scenario, if the UE is configured with a CSI report configuration (e.g., higher layer parameter CSI-ReportConfig) with the report quantity (e.g., higher layer parameter reportQuantity) set to 'cri-RI-CQI' , a second non-PMI port indication parameter (e.g., higher layer parameter non-PMI-PortIndication) can be added in the CSI report configuration (e.g., higher layer parameter CSI-ReportConfig) . That is, the first non-PMI port indication parameter (e.g., non-PMI-PortIndication) and the second non-PMI port indication parameter (e.g., higher layer parameter non-PMI-PortIndication) are included in the CSI report configuration (e.g., higher layer parameter CSI-ReportConfig) . The first non-PMI port indication parameter (e.g., non-PMI-PortIndication) is used for indicating the port indices of the CSI-RS resource from the first TRP, and the second non-PMI port indication parameter (e.g., non-PMI-PortIndication) is used for indicating the port indices of the CSI-RS resource from the second TRP.

In detail, the first non-PMI port indication parameter (e.g., non-PMI-PortIndication) determines a sequence of port indices for the first TRP, where the port indices are selected from the CSI-RS resource transmitted from the first TRP. In the sequence of the port indices of the CSI-RS resource from the first TRP, the port indices of up to K1 CSI-RS resources can be configured and the port indices for each CSI-RS resource are configured based on order arrangement of the associated CSI-RS resource index (e.g., higher layer parameter NZP-CSI-RS-ResourceId) in the linked CSI resource setting indicated by resources for channel measurement parameter (e.g., higher layer parameter resourcesForChannelMeasurement) linked to the CSI report configuration, where the CSI-RS resources are transmitted from the first TRP. In the port indices for each CSI-RS resource, port indices of m ports are indicated in arrangement of layer ordering for rank m, i.e., the port indices of the m port are indicated as:

where

The second non-PMI port indication parameter (e.g., non-PMI-PortIndication) determines a sequence of port indices for the second TRP, where the port indices are selected from the CSI-RS resource transmitted from the second TRP. In the sequence of the port indices of the CSI-RS resource from the second TRP, the port indices of up to K2 CSI-RS resources can be configured and the port indices for each CSI-RS resource are configured based on order arrangement of the associated CSI-RS resource index (e.g., NZP-CSI-RS-ResourceId) in the linked CSI resource setting indicated by resources for channel measurement parameter (e.g., resourcesForChannelMeasurement) linked to the CSI report configuration, where the CSI-RS resources are transmitted from the second TRP. In the port indices for each CSI-RS resource, port indices of m ports are indicated in arrangement of layer ordering for rank m, i.e., the port indices of the m port are indicated as:

where

An example of the detailed sequence of port indices for the first TRP and sequence of port indices for the second TRP is shown in the following:

Table 5:

As shown in FIG. 6, the number of ports of the first and second CSI-RS resources is 8, i.e., p _i, i=0, 1, …, 7. For the two CSI-RS resources, the indicated port indices are the same for the same rank. For example, regarding rank4, the indicated port indices of the first and second CSI-RS resources are p ₀, p ₁, p ₂, p ₃.

Two higher layer parameters of port index for eight ranks:

In an embodiment, the CSI report configuration comprises a combination of a non-PMI-PortIndication1 and a PortIndexFor8Ranks1 for TRP 1 and a combination of a non-PMI-PortIndication2 and a PortIndexFor8Ranks2 for TRP 2

If two higher layer parameters of port index for eight ranks parameter (e.g., PortIndexFor8Ranks) are configured and each of the two higher layer parameters of port index for eight ranks parameter corresponds to a CSI-RS resource transmitted from a separate TRP, port indices for the same rank for CSI-RS resources from different TRPs can be different. Hence, the port indices and CSI-RS resource for different TPRs can be configured flexibly and adapted to the dynamic change of different links between TRP and UE.

In an embodiment of the invention, for non-PMI based CSI measurement and reporting in multi-TRP/panel scenario, if the UE is configured with a CSI report configuration (e.g., higher layer parameter CSI-ReportConfig) with the report quantity (e.g., higher layer parameter reportQuantity) set to 'cri-RI-CQI' , a second non-PMI port indication parameter (e.g., higher layer parameter non-PMI-PortIndication) and a second port index for eight ranks parameter (e.g., higher layer parameter PortIndexFor8Ranks) can be added in the CSI report configuration (e.g., higher layer parameter CSI-ReportConfig) . The first non-PMI port indication parameter (e.g., non-PMI-PortIndication) and the first port index for eight ranks parameter (e.g., PortIndexFor8Ranks) are used for indicating the sequence of the port indices of the CSI-RS resource from the first TRP. The second non-PMI port indication parameter (e.g., non-PMI-PortIndication) and the second port index for eight ranks parameter (e.g., PortIndexFor8Ranks) are used for indicating the sequence of the port indices of the CSI-RS resource from the second TRP.

In detail, the first non-PMI port indication parameter (e.g., non-PMI-PortIndication) and the first port index for eight ranks parameter (e.g., PortIndexFor8Ranks) determine a sequence of port indices for the first TRP, where the port indices are selected from the CSI-RS resource transmitted from the first TRP.

In the sequence of port indices for the first TRP, the port indices of up to K1 CSI-RS resources can be configured and the port indices for each CSI-RS resource are configured based on order arrangement of the associated CSI-RS resource index (e.g., higher layer parameter NZP-CSI-RS-ResourceId) in the linked CSI resource setting indicated by resources for channel measurement parameter (e.g., higher layer parameter resourcesForChannelMeasurement) linked to the CSI report configuration, where the CSI-RS resources are transmitted from the first TRP. In the port indices for each CSI-RS resource, port indices of m ports are indicated in arrangement of layer ordering for rank m, i.e., the port indices of the m port are indicated as:

where

The second non-PMI port indication parameter (e.g., non-PMI-PortIndication) and the second port index for eight ranks parameter (e.g., PortIndexFor8Ranks) determine a sequence of port indices for the second TRP, where the port indices are selected from the CSI-RS resource transmitted from the second TRP.

In the sequence of port indices for the second TRP, the port indices of up to K2 CSI-RS resources can be configured, and the port indices for each CSI-RS resource are configured based on order arrangement of the associated CSI-RS resource index (e.g., NZP-CSI-RS-ResourceId) in the linked CSI resource setting indicated by resources for channel measurement parameter (e.g., resourcesForChannelMeasurement) linked to the CSI report configuration, where the CSI-RS resources are transmitted from the second TRP. In the port indices for each CSI-RS resource, port indices of m ports are indicated in arrangement of layer ordering for rank m, i.e., the port indices of the m port are indicated as:

where

are the CSI-RS port indices for rank n, and R∈ {1, 2, …, RI _max} , and RI _max=min (8, P) , and P is the number of ports in the CSI-RS resource.

Table 6:

As shown in FIG. 7, the number of ports of the first and second CSI-RS resources is 8, i.e., p _i, i=0, 1, …, 7. For the two CSI-RS resources, the indicated port indices can be different for the same rank. For example, regarding rank4, the indicated port indices of the first CSI-RS resource are p ₀, p ₁, p ₂, p ₃; while the indicated port indices of the second CSI-RS resource are p ₃, p ₄, p ₅, p ₆.

Absence of higher layer parameter of non-PMI port indication:

If UE is not configured with higher layer parameter of non-PMI port indication parameter (e.g., non-PMI-PortIndication) , i.e., the CSI report configuration (e.g., higher layer parameter CSI-ReportConfig) has no non-PMI port indication parameter (e.g., non-PMI-PortIndication) for the UE, the default assumption on port indices of CSI-RS resource from the two TRPs should be provided.

Based on offset:

If a set of default port indices is provided for the first TRP and several offset values can be indicated to determine the port indices for the second TRP. That is, a set of default port indices is provided for the first TRP as the sequence of the port indices of the CSI-RS resource from the first TRP, and a set of offset values is provided for the second TRP and utilized by the UE to determine the sequence of the port indices of the CSI-RS resource from the second TRP. Thus, the port indices for the second TRP are configurable.

In an embodiment of the invention, for non-PMI based CSI measurement and reporting in multi-TRP/panel scenario, if the UE is configured with a CSI report configuration (e.g., higher layer parameter CSI-ReportConfig) with the report quantity (e.g., higher layer parameter reportQuantity) set to 'cri-RI-CQI' and the higher layer parameter of non-PMI port indication parameter (e.g., non-PMI-PortIndication) is not configured, a set of default port indices is provided for the first TRP, and a number RI _max of offset values can be indicated to determine the sequence of the port indices of the CSI-RS resource from the second TRP, where the offset values are provided per rank and the offset values can be pre-defined or signaled by downlink control information (DCI) , medium access control (MAC) control element (CE) , or radio resource control (RRC) , and RI _max=min (8, P) , and P is the number of ports in the CSI-RS resource.

In detail, for the CSI-RS resource from the first TRP that is configured in the CSI resource setting linked to the CSI report configuration (e.g., CSI-ReportConfig) , the default port indices (i.e.,

) for rank m are {0, …, m-1} , where rank m=1, 2, …, RI _max, and RI _max=min (8, P) , and P is the number of ports in the CSI-RS resource.

) for rank n are { (0+offset _(n-1) ) mod P, …, ( (n-1) +offset _(n-1) ) mod P} , where rank n=1, 2, …, RI _max , and RI _max=min (8, P) , and P is the number of ports in the CSI-RS resource. Especially, if the RI _max offsets are the same value, it is equivalent to indicate a single offset value. More specially, if the RI _max offsets are equal to 0, it means that for a rank, default port indices of CSI-RS resources from two TRPs are the same.

Two sets of default port indices:

If two sets of default port indices are provided and each corresponds to a separate TRP, the default port indices can be provided with more flexibility. For example, a first set of default port indices is provided for the first TRP as the sequence of the port indices of the CSI-RS resource from the first TRP, and a second set of default port indices is provided for the second TRP as the sequence of the port indices of the CSI-RS resource from the second TRP.

In an embodiment of the invention, for non-PMI based CSI measurement and reporting in multi-TRP/panel scenario, if the UE is configured with a CSI report configuration (e.g., higher layer parameter CSI-ReportConfig) with the report quantity (e.g., higher layer parameter reportQuantity) set to 'cri-RI-CQI' and the higher layer parameter of non-PMI port indication parameter (e.g., non-PMI-PortIndication) is not configured, two sets of default port indices are provided and each corresponds to a separate TRP, where each set of default port indices is provided per rank.

for the CSI-RS resource from the second TRP that is configured in the CSI resource setting linked to the CSI report configuration (e.g., CSI-ReportConfig) , the default port indices (i.e.,

) for rank n are { (n) mod P, …, (2·n-1) mod P} , where rank n=1, 2, …, RI _max, and RI _max=min (8, P) , and P is the number of ports in the CSI-RS resource.

As shown in FIG. 8, the number of ports of the first and second CSI-RS resources is 8, i.e., p _i, i=0, 1, …, 7. For the two CSI-RS resources, the default port indices can be different for the same rank. For example, regarding rank4, the default port indices of the first CSI-RS resource are p ₀, p ₁, p ₂, p ₃; while the default port indices of the second CSI-RS resource are p ₄, p ₅, p ₆, p ₇.

CSI measurement and report:

Since a gNB is not aware of the interference at the UE, if the gNB determines rank directly based on the UL channel measurement, the rank selected by gNB may not be the optimal rank. Hence, a base station, such as a gNB, should transmit precoded CSI-RS resource to the UE, and the UE achieves better link adaptation based on the indicated port indices of CSI-RS resource.

RI calculation and report:

RI calculation:

Since different ranks are optimal in different signal-to-interference plus noise ratio (SINR) levels, it is better for UE to determine the optimal transmission rank.

the sequence of the port indices of the CSI-RS resource from the first TRP may be indicated port indices of the CSI-RS resource from the first TRP, and the sequence of the port indices of the CSI-RS resource from the second TRP may be indicated port indices of the CSI-RS resource from the second TRP.

In an embodiment of the invention, for non-PMI based CSI measurement and reporting in multi-TRP/panel scenario, if the UE is configured with a CSI report configuration (e.g., higher layer parameter CSI-ReportConfig) with the report quantity (e.g., higher layer parameter reportQuantity) set to 'cri-RI-CQI' , the UE determines a rank for transmission from the first TRP based on the indicated port indices of the CSI-RS resource from the first TRP and a rank for transmission from the second TRP based on the indicated port indices of the CSI-RS resource from the second TRP. As described in the aforementioned embodiments, the indicated port indices for the first and second TRPs are determined by the corresponding non-PMI port indication parameter (e.g., non-PMI-PortIndication) and port index for eight ranks parameter (e.g., PortIndexFor8Ranks) respectively.

For rank calculation of the rank of the first TRP, for a dedicated rank m, the first m columns of an identity matrix are applied on the indicated port indices of CSI-RS resource from the first TRP associated with rank m, and rank m=1, 2, …, RI _max, and RI _max=min (8, P) , and P is the number of ports in the CSI-RS resource. The UE determines the rank of the first TRP from all potential ranks based a dedicated criterion (e.g., SINR criterion, an SINR value, or an SINR range) . Potential rank is 1, 2, …, RI _max.

For rank calculation of the rank of the second TRP, for a dedicated rank n, the first n columns of an identity matrix are applied on the indicated port indices of CSI-RS resource from the second TRP associated with rank n, and rank n=1, 2, …, RI _max, and RI _max=min (8, P) , and P is the number of ports in the CSI-RS resource. The UE determines the rank of the second TRP from all potential ranks based a dedicated criterion (e.g., SINR criterion, an SINR value, or an SINR range) . Potential rank is 1, 2, …, RI _max. The UE determines a rank of multi-TRP associated with the first TRP and the second TRP as the sum of the determined rank of the first TRP and the determined rank of the second TRP.

The UE reports the determined rank of multi-TRP associated with the first TRP and the second TRP to the base station. Alternatively, the UE reports the determined rank of the first TRP and the determined rank of the second TRP to the base station.

As shown in FIG. 9, the number of ports of the first and second CSI-RS resources is 4, i.e., p _i, i=0, 1, …, 3. For the first CSI-RS resources, the indicated port indices for rank m=1, 2, …, 4 are p ₀; p ₀, p ₁; p ₀, p ₁, p ₂; p ₀, p ₁, p ₂, p ₃ respectively; while for the second CSI-RS resources, the indicated port indices for rank n=1, 2, …, 4 are p ₁; p ₂, p ₃; p ₁, p ₂, p ₃; p ₀, p ₁, p ₂, p ₃ respectively.

RI report:

(1) Report RIs directly:

If the determined ranks of two TRPs are reported directly to fully reflect the channel states, the ranks can achieve better link adaptation.

In an embodiment of the invention, for non-PMI based CSI measurement and reporting in multi-TRP/panel scenario, if the UE is configured with a CSI report configuration (e.g., higher layer parameter CSI-ReportConfig) with the report quantity (e.g., higher layer parameter reportQuantity) set to 'cri-RI-CQI' , the UE directly reports the determined ranks for the first TRP and the second TRP to the base station without any other restriction, where the rank for transmission from the first TRP is determined based on the indicated port indices of CSI-RS resource from the first TRP and the rank for transmission from the second TRP is determined based on the indicated port indices of CSI-RS resource from the second TRP. The rank for transmission from the first TRP is referred to as a rank of the first TRP, and the rank for transmission from the second TRP is referred to as a rank of the second TRP. The UE reports the determined rank of multi-TRP associated with the first TRP and the second TRP to the base station. Alternatively, the UE reports to the base station the rank of the first TRP as a reported rank of the first TRP, and the rank of the second TRP as a reported rank of the second TRP.

(2) Report the restricted RIs

To reduce the RI feedback overhead, a subset of RI combinations is reported. In multi-TRP/panel scenario, for rankm=2, 3, …, 8 , the corresponding rank combinations for two TRPs can be (1+1) , (1+2, 2+1) , (2+2) , (2+3) , (3+3) , (3+4) , (4+4) respectively. It means that the reported RIs of two TRPs should be one of the listed rank combinations. Hence, each reported RI should be one of the elements of the rank combinations. The Table 7 shows value of rank m of multi-TRP and related rank combinations for two TRPs, where rankm=2, 3, …, or 8.

Table 7:

Rank m	Related rank combinations for two TRPs
Rank 2	(1+1)
Rank 3	(1+2) , (2+1)
Rank 4	(2+2) ,
Rank 5	(2+3) , (3+2)
Rank 6	(3+3) ,
Rank 7	(3+4) , (4+3)
Rank 8	(4+4)

In the related rank combinations of rank m of multi-TRP, a first element in a related rank combination represents a determined rank of the first TRP, and a second element in a related rank combination represents a determined rank of the second TRP.

A matched related rank combination of the determined rank of multi-TRP is a related rank combination identical to a combination of the determined rank of the first TRP plus the determined rank of the second TRP. That is, a first element (i.e., the first operand) in the matched related rank combination of the corresponding element equal to the determined rank of the first TRP and a second element (i.e., the second operand) in the matched related rank combination of the corresponding element equal to the determined rank of the second TRP. A corresponding element rank m of the determined rank of multi-TRP is a value of rank m that is associated with a matched related rank combination of the determined rank of multi-TRP and the determined rank of multi-TRP has a RI value equal to m.

In an embodiment of the invention, for non-PMI based CSI measurement and reporting in multi-TRP/panel scenario, if the UE is configured with a CSI report configuration (e.g., higher layer parameter CSI-ReportConfig) with the report quantity (e.g., higher layer parameter reportQuantity) set to 'cri-RI-CQI' , and if the determined rank of multi-TRP associated with the first TRP and the second TRP is larger than a corresponding element of a related rank combination, the reported RI is the corresponding element representing the related rank combination; and if the determined rank of multi-TRP is smaller than the corresponding element of rank combination, the determined rank of multi-TRP are discarded. That is, when the determined rank of multi-TRP has only one corresponding element, the UE reports the corresponding element as the reported rank of multi-TRP. When the determined rank of multi-TRP has a plurality of corresponding elements, the UE reports the smallest corresponding element in the plurality of corresponding elements as the reported rank of multi-TRP. When the determined rank of multi-TRP has no corresponding element, the UE discards the determined rank of multi-TRP. For example, with reference to Table 8, a determined rank 4 of multi-TRP is obtained from a sum of a determined RI 1 of the first TRP and a determined RI 3 of the second TRP. The determined rank 4 of multi-TRP has a corresponding element rank 4 in the Table 7, but is discarded because the determined rank 4 of multi-TRP does not have a matched related rank combination of the corresponding element. Rank 4 in the Table 7 does not have a related rank combination (1+3) .

Hence, based on the determined RIs, the corresponding reported RIs can be shown in Table 1.

Table 8: Determined RIs and reported RIs mapping

As shown in the Table 8, if the determined RI of the first TRP is 1 and determined RI of the second TRP is 2/3/4, the reported RI of two TRPs are (1+2) . If the determined RIs of the first and second TRP are 3 and 1 respectively, the determined RIs are discarded.

CQI calculation:

Since CQI is calculated based on the reported rank and port indices corresponding to the reported rank, it is necessary to design method to calculate CQI in multi-TRP/panel scenario to achieve better throughput performance.

In an embodiment of the invention, for non-PMI based CSI measurement and reporting in multi-TRP/panel scenario, if the UE is configured with a CSI report configuration (e.g., higher layer parameter CSI-ReportConfig) with the report quantity (e.g., higher layer parameter reportQuantity) set to 'cri-RI-CQI' , when calculating a CQI for the reported rank of the first TRP, the UE uses the indicated the port indices of CSI-RS resource from the first TRP associated with the reported rank of the first TRP; when calculating a CQI for the reported rank of the second TRP, the UE uses the indicated port indices of CSI-RS resource from the second TRP associated with the reported rank of the second TRP.

For a precoder V ₁ of the first TRP, for a reported rank m of the first TRP, the first m columns of an identity matrix are applied on the indicated port indices of the CSI-RS resource from the first TRP associated with rank m. The UE estimates a channel between the first TRP and the UE based on the CSI-RS resource from the first TRP and obtains a channel estimation matrix H ₁ representing the channel between the first TRP and the UE.

For a precoder V ₂ of the second TRP, for a reported rank n of the second TRP, the first n columns of an identity matrix are applied on the indicated port indices of the CSI-RS resource from the second TRP associated with rank n. The UE estimates a channel between the second TRP and the UE based on the CSI-RS resource from the second TRP and obtains a channel estimation matrix H ₂ representing the channel between the second TRP and the UE.

Based on the above analysis, the precoder of the first TRP is V ₁ and the estimated channels between the first TRP and UE is H ₁; while the precoder of the second TRP is V ₂ and the estimated channels between the first TRP and UE is H ₂. The UE calculates the CQI based on these two precodersV ₁ and V ₂ and the channel estimation matrix H ₁ and the channel estimation matrix H ₂.

As shown in FIG. 9, the number of ports of the first and second CSI-RS resources is 4, i.e., p _i, i=0, 1, …, 3. If the ranks of the two TRPs are 2, when calculating CQI, the indicated port indices for rank2 are p ₀, p ₁ for the first CSI-RS resources; while the indicated port indices for rank2 are p ₂, p ₃ for the second CSI-RS resources.

CSI sharing between single-TRP and multi-TRP measurement hypotheses:

If the CSI (e.g., RI and CQI) is shared between single-TRP and multi-TRP measurement hypotheses, UCI payload can be reduced. Since the CSI-RS resource for non-PMI based CSI measurement technique is precoded, it is not appropriate to share CSI between single-TRP and multi-TRP measurement hypotheses if CSI-RS resource from single-TRP is non-precoded and CSI-RS resource from multi-TRP is precoded. Hence, it is essential to design CSI sharing mechanism.

RI sharing:

Without limitation:

The UE may operate single-TRP transmission and multi-TRP transmission simultaneously. For the single-TRP and multi-TRP measurement hypotheses with non-PMI based CSI measurement and reporting, if RI sharing between single-TRP and multi-TRP measurement hypotheses is applied without any limitation, RI sharing is more flexible.

In an embodiment of the invention, for CSI reporting associated with single-TRP and multi-TRP measurement hypotheses, if the UE is configured with a CSI report configuration (e.g., higher layer parameter CSI-ReportConfig) with the report quantity (e.g., higher layer parameter reportQuantity) set to 'cri-RI-CQI' , and if non-PMI based CSI measurement and reporting is applied in single-TRP and multi-TRP/panel measurement hypotheses, RI sharing between single-TRP and multi-TRP measurement hypotheses is enabled. For example, if the UE only reports the RI of multi-TRP measurement hypotheses and does not report the RI of single-TRP measurement hypotheses, the UE can apply the reported RI for single-TRP transmission.

CSI-RS resources with the same number of ports and port indices:

Since the rank is calculated based on the number of ports and port indices of the CSI-RS resource for non-PMI based CSI measurement and reporting, if a number of ports and port indices of a CSI-RS resource for single-TRP measurement and a number of ports and port indices of a CSI-RS resource for multi-TRP measurement are the same, it means that the configuration of CSI-RS resources for single-TRP and multi-TRP measurement are the same. With the same configuration of CSI-RS resource, it is fair to share the RI between single-TRP and multi-TRP measurement hypotheses.

In an embodiment of the invention, for CSI reporting associated with single-TRP and multi-TRP measurement hypotheses, if the UE is configured with a CSI report configuration (e.g., higher layer parameter CSI-ReportConfig) with the report quantity (e.g., higher layer parameter reportQuantity) set to 'cri-RI-CQI' , and if non-PMI based CSI measurement and reporting is applied in single-TRP and multi-TRP/panel measurement hypotheses, and if a number of ports and port indices of a CSI-RS resource for single-TRP measurement and a number of ports and port indices of a CSI-RS resource for multi-TRP measurement are the same, RI sharing between single-TRP and multi-TRP measurement hypotheses is enabled. As described in the aforementioned embodiments, the port indices of the CSI-RS resource may be indicated by non-PMI port indication parameter (e.g., higher layer parameter non-PMI-PortIndication) . For example, if UE only reports the RI of multi-TRP measurement hypotheses and does not report the RI of single-TRP measurement hypotheses, the UE can apply the reported RI for single-TRP transmission.

The same RI:

If the RI for single-TRP and multi-TRP measurement are the same, it is fair to share the RI between single-TRP and multi-TRP measurement hypotheses.

In an embodiment of the invention, for CSI reporting associated with single-TRP and multi-TRP measurement hypotheses, if the UE is configured with a CSI report configuration (e.g., higher layer parameter CSI-ReportConfig) with the report quantity (e.g., higher layer parameter reportQuantity) set to 'cri-RI-CQI' , and if non-PMI based CSI measurement and reporting is applied in single-TRP and multi-TRP/panel measurement hypotheses, and if a rank indicator (RI) for single-TRP and a RI for multi-TRP measurement are the same, RI sharing between single-TRP and multi-TRP measurement hypotheses can be enabled. For example, if UE only reports the RI of multi-TRP measurement hypotheses and does not report the RI of single-TRP measurement hypotheses, UE can apply the reported RI for single-TRP transmission.

CQI sharing:

Since the CQI is calculated based on the number of ports and port indices of the CSI-RS resource for non-PMI based CSI measurement and reporting, if a number of ports and port indices of a CSI-RS resource for single-TRP measurement and a number of ports and port indices of a CSI-RS resource for multi-TRP measurement are the same, it means that the configuration of CSI-RS resources for single-TRP and multi-TRP measurement are the same. With the same configuration of CSI-RS resource, it is fair to share the CQI between single-TRP and multi-TRP measurement hypotheses.

In an embodiment of the invention, for CSI reporting associated with single-TRP and multi-TRP measurement hypotheses, if the UE is configured with a CSI report configuration (e.g., higher layer parameter CSI-ReportConfig) with the report quantity (e.g., higher layer parameter reportQuantity) set to 'cri-RI-CQI' , and if non-PMI based CSI measurement and reporting is applied in single-TRP and multi-TRP/panel measurement hypotheses, and if a number of ports and port indices of a CSI-RS resource for single-TRP measurement and a number of ports and port indices of a CSI-RS resource for multi-TRP measurement are the same, CQI sharing between single-TRP and multi-TRP measurement hypotheses can be enabled, where the port indices of the CSI-RS resource are indicated by non-PMI port indication parameter (e.g., higher layer parameter non-PMI-PortIndication) . For example, if UE only reports the CQI of multi-TRP measurement hypotheses and does not report the CQI of single-TRP measurement hypotheses, UE can apply the reported CQI for single-TRP transmission.

FIG. 10 is a block diagram of an example system 700 for wireless communication according to an embodiment of the present disclosure. Embodiments described herein may be implemented into the system using any suitably configured hardware and/or software. FIG. 10 illustrates the system 700 including a radio frequency (RF) circuitry 710, a baseband circuitry 720, a processing unit 730, a memory/storage 740, a display 750, a camera 760, a sensor 770, and an input/output (I/O) interface 780, coupled with each other as illustrated.

The processing unit 730 may include circuitry, such as, but not limited to, one or more single-core or multi-core processors. The processors may include any combinations of general-purpose processors and dedicated processors, such as graphics processors and application processors. The processors may be coupled with the memory/storage and configured to execute instructions stored in the memory/storage to enable various applications and/or operating systems running on the system.

The radio control functions may include, but are not limited to, signal modulation, encoding, decoding, radio frequency shifting, etc. In some embodiments, the baseband circuitry may provide for communication compatible with one or more radio technologies. For example, in some embodiments, the baseband circuitry may support communication with 5G NR, LTE, an evolved universal terrestrial radio access network (EUTRAN) and/or other wireless metropolitan area networks (WMAN) , a wireless local area network (WLAN) , a wireless personal area network (WPAN) . Embodiments in which the baseband circuitry is configured to support radio communications of more than one wireless protocol may be referred to as multi-mode baseband circuitry. In various embodiments, the baseband circuitry 720 may include circuitry to operate with signals that are not strictly considered as being in a baseband frequency. For example, in some embodiments, baseband circuitry may include circuitry to operate with signals having an intermediate frequency, which is between a baseband frequency and a radio frequency.

In various embodiments, the system 700 may be a mobile computing device such as, but not limited to, a laptop computing device, a tablet computing device, a netbook, an ultrabook, a smartphone, etc. In various embodiments, the system may have more or less components, and/or different architectures. Where appropriate, the methods described herein may be implemented as a computer program. The computer program may be stored on a storage medium, such as a non-transitory storage medium.

The embodiment of the present disclosure is a combination of techniques/processes that can be adopted in 3GPP specification to create an end product.

If the software function unit is realized and used and sold as a product, it can be stored in a readable storage medium in a computer. Based on this understanding, the technical plan proposed by the present disclosure can be essentially or partially realized as the form of a software product. Or, one part of the technical plan beneficial to the conventional technology can be realized as the form of a software product. The software product in the computer is stored in a storage medium, including a plurality of commands for a computational device (such as a personal computer, a server, or a network device) to run all or some of the steps disclosed by the embodiments of the present disclosure. The storage medium includes a USB disk, a mobile hard disk, a read-only memory (ROM) , a random access memory (RAM) , a floppy disk, or other kinds of media capable of storing program codes.

While the present disclosure has been described in connection with what is considered the most practical and preferred embodiments, it is understood that the present disclosure is not limited to the disclosed embodiments but is intended to cover various arrangements made without departing from the scope of the broadest interpretation of the appended claims.

Claims

A method for channel state information (CSI) measurement, executable in a user equipment (UE) , comprising:

determining a sequence of port indices of a CSI-RS resource from a first TRP according to a CSI report configuration to obtain port indices for the first TRP, wherein the sequence of the port indices of the CSI-RS resource from the first TRP is configured;

determining a sequence of port indices of a CSI-RS resource from a second TRP according to the CSI report configuration to obtain port indices for the second TRP, wherein the sequence of the port indices of the CSI-RS resource from the second TRP is configured;

performing CSI measurement for the first TRP using the port indices for the first TRP and CSI measurement for the second TRP using port indices for the second TRP; and

reporting the CSI measurement for the first TRP and the CSI measurement for the second TRP.
The method of claim 1, wherein in the CSI report configuration, only one higher layer parameter of non-PMI port indication parameter method for CSI measurement is configured, the port indices of the CSI-RS resource from the first TRP are configured in the non-PMI port indication parameter, and a set of offset values are indicated to determine the port indices of the CSI-RS resource from the second TRP.
The method of claim 2, wherein if the UE is configured with the CSI report configuration with report quantity set to 'cri-RI-CQI' , the sequence of port indices of the CSI-RS resource from the first TRP is configured in the non-PMI port indication parameter and the sequence of port indices of the CSI-RS resource from the second TRP is determined based on the sequence of port indices for the first TRP and RI _max offset values, and the offset values are provided per rank.
The method of claim 3, wherein the offset values are pre-defined or signaled by DCI, MAC CE, or RRC.
The method of claim 3, wherein RI _max=min (8, P) , and P is a number of ports in the CSI-RS resource.
The method of claim 3, wherein port indices of CSI-RS resources transmitted from the first TRP are configured and the port indices for each CSI-RS resource are configured based on order arrangement of an associated CSI-RS resource index in CSI resource setting indicated by resources for channel measurement parameter linked to the CSI report configuration.
The method of claim 6, wherein in the port indices for each CSI-RS resource, port indices of m ports are indicated in arrangement of layer ordering for rank m, the port indices of the m port are indicated in the CSI report configuration as:
wherein
are the CSI-RS port indices of the m port for rank m, and R∈ {1, 2, …, RI _max} , and RI _max=min (8, P) , and P is the number of ports in the CSI-RS resource.
The method of claim 7, wherein for the CSI-RS resource from the second TRP that is configured in the CSI resource setting linked to the CSI report configuration, the port indices
for rank m are

where, offset _(m-1) is an offset associated with rank m, rank m=1, 2, …, RI _max, and RI _max=min (8, P) , and P is the number of ports in the CSI-RS resource.
The method of claim 1, wherein in the CSI report configuration, only one higher layer parameter of non-PMI port indication parameter is configured, the port indices of a CSI-RS resource from the first TRP and the port indices of a CSI-RS resource from the second TRP are configured in the same non-PMI port indication parameter.
The method of claim 9, wherein the port indices for the same rank for CSI-RS resources from different TRPs are the same.
The method of claim 9, wherein if the UE is configured with the CSI report configuration with report quantity set to 'cri-RI-CQI' , the sequence of port indices corresponding to at least 2 CSI-RS resources is configured in the non-PMI port indication parameter, the sequence of the port indices of the CSI-RS resource from the first TRP and the sequence of the port indices of the CSI-RS resource from the second TRP are configured in the non-PMI port indication parameter.
The method of claim 11, wherein in the port indices for each CSI-RS resource, port indices of m ports are indicated in arrangement of layer ordering for rank m, the port indices of the m port are indicated as:
wherein
are the CSI-RS port indices of the m port for rank m, and R∈ {1, 2, …, RI _max} , and RI _max=min (8, P) , and P is the number of ports in the CSI-RS resource.
The method of claim 11, wherein the non-PMI port indication parameter determines a combined sequence of port indices, and the combined sequence of port indices is divided into two groups including a first group and a second group, wherein the first group of port indices comprises the sequence of the port indices of the CSI-RS resource from the first TRP and the second group of port indices comprises the sequence of the port indices of the CSI-RS resource from the second TRP.
The method of claim 13, wherein for the first group of port indices for the first TRP, port indices of up to K1 CSI-RS resources are configured, and the port indices for each CSI-RS resource are configured based on order arrangement of the associated CSI-RS resource index in CSI resource setting indicated by resources for channel measurement parameter linked to the CSI report configuration, wherein the CSI-RS resources are transmitted from the first TRP; and

for the second group of port indices for the second TRP, port indices of up to K2 CSI-RS resources are configured, and the port indices for each CSI-RS resource are configured based on order arrangement of the associated CSI-RS resource index in CSI resource setting indicated by resources for channel measurement parameter linked to the CSI report configuration, wherein the CSI-RS resources are transmitted from the second TRP.
The method of claim 14, wherein in the port indices for each CSI-RS resource, port indices of m ports are indicated in arrangement of layer ordering for rank m, the port indices of the m port are indicated as:
wherein
are the CSI-RS port indices for rank m, and R∈ {1, 2, …, RI _max} , and RI _max=min (8, P) , and P is the number of ports in the CSI-RS resource.
The method of claim 1, wherein the sequence of the port indices of the CSI-RS resource from the first TRP is configured in a first non-PMI port indication parameter, and the sequence of the port indices of the CSI-RS resource from the second TRP is configured in a second non-PMI port indication parameter.
The method of claim 16, wherein the port indices for the same rank for CSI-RS resources from different TRPs are the same.
The method of claim 16, wherein if the UE is configured with the CSI report configuration with report quantity set to 'cri-RI-CQI' , the first non-PMI port indication parameter and the second non-PMI port indication parameter are included in the CSI report configuration.
The method of claim 18, wherein in the sequence of the port indices of the CSI-RS resource from the first TRP, port indices of up to K1 CSI-RS resources are configured and the port indices for each CSI-RS resource are configured based on order arrangement of the associated CSI-RS resource index in CSI resource setting indicated by resources for channel measurement parameter linked to the CSI report configuration, wherein the CSI-RS resources are transmitted from the first TRP, in the port indices for each CSI-RS resource, port indices of m ports are indicated in arrangement of layer ordering for rank m, the port indices of the m port are indicated as:
wherein
are the CSI-RS port indices for rank m, and R∈ {1, 2, …, RI _max} , and RI _max=min (8, P) , and P is the number of ports in the CSI-RS resource; and

in the sequence of the port indices of the CSI-RS resource from the second TRP, port indices of up to K2 CSI-RS resources are configured and the port indices for each CSI-RS resource are configured based on order arrangement of the associated CSI-RS resource index in CSI resource setting indicated by resources for channel measurement parameter linked to the CSI report configuration, wherein the CSI-RS resources are transmitted from the second TRP, in the port indices for each CSI-RS resource, port indices of m ports are indicated in arrangement of layer ordering for rank m, the port indices of the m port are indicated as:
wherein
are the CSI-RS port indices for rank m, and R∈ {1, 2, …, RI _max} , and RI _max=min (8, P) , and P is the number of ports in the CSI-RS resource.
The method of claim 1, wherein a first non-PMI port indication parameter and a first port index for eight ranks parameter are used for indicating the sequence of the port indices of the CSI-RS resource from the first TRP, and a second non-PMI port indication parameter and a second port index for eight ranks parameter are used for indicating the sequence of the port indices of the CSI-RS resource from the second TRP.
The method of claim 20, wherein if the UE is configured with the CSI report configuration with report quantity set to 'cri-RI-CQI' , the second non-PMI port indication parameter and the second port index for eight ranks parameter are included in the CSI report configuration.
The method of claim 21, wherein in the sequence of port indices for the first TRP, port indices of up to K1 CSI-RS resources are configured and the port indices for each CSI-RS resource are configured based on order arrangement of the associated CSI-RS resource index in CSI resource setting indicated by resources for channel measurement parameter linked to the CSI report configuration, wherein the CSI-RS resources are transmitted from the first TRP, in the port indices for each CSI-RS resource, port indices of m ports are indicated in arrangement of layer ordering for rank m, the port indices of the m port are indicated as:
wherein
are the CSI-RS port indices for rank m, and R∈ {1, 2, …, RI _max} , and RI _max=min (8, P) , and P is the number of ports in the CSI-RS resource; and

in the sequence of port indices for the second TRP, port indices of up to K2 CSI-RS resources are configured and the port indices for each CSI-RS resource are configured based on order arrangement of the associated CSI-RS resource index in CSI resource setting indicated by resources for channel measurement parameter linked to the CSI report configuration, wherein the CSI-RS resources are transmitted from the second TRP, in the port indices for each CSI-RS resource, port indices of m ports are indicated in arrangement of layer ordering for rank m, the port indices of the m port are indicated as:
wherein
are the CSI-RS port indices for rank n, and R∈ {1, 2, …, RI _max} , and RI _max=min (8, P) , and P is the number of ports in the CSI-RS resource.
The method of claim 1, wherein a set of default port indices is provided for the first TRP as the sequence of the port indices of the CSI-RS resource from the first TRP, and a set of offset values is provided for the second TRP and utilized to determine the sequence of the port indices of the CSI-RS resource from the second TRP.
The method of claim 23, wherein if the UE is configured with the CSI report configuration with report quantity set to 'cri-RI-CQI' and the higher layer parameter of non-PMI port indication parameter is not configured, the set of default port indices is provided for the first TRP, and a number RI _max of offset values are indicated to determine the sequence of the port indices of the CSI-RS resource from the second TRP, wherein the offset values are provided per rank.
The method of claim 24, wherein the offset values are pre-defined or signaled by DCI, MAC CE, or RRC.
The method of claim 24, wherein for the CSI-RS resource from the first TRP that is configured in CSI resource setting linked to the CSI report configuration, default port indices
for rank m are {0, …, m-1} , wherein rank m=1, 2, …, RI _max, and RI _max=min (8, P) , and P is the number of ports in the CSI-RS resource.
The method of claim 24, wherein for the CSI-RS resource from the second TRP that is configured in CSI resource setting linked to the CSI report configuration, port indices
for rank n are { (0+offset _(n-1) ) mod P, …, ( (n-1) +offset _(n-1) ) mod P} , wherein rank n=1, 2, …, RI _max , and RI _max=min(8, P) , and P is the number of ports in the CSI-RS resource.
The method of claim 1, wherein if the UE is configured with the CSI report configuration with report quantity set to 'cri-RI-CQI' and the higher layer parameter of non-PMI port indication parameter is not configured, a first set of default port indices is provided for the first TRP as the sequence of the port indices of the CSI-RS resource from the first TRP, a second set of default port indices is provided for the second TRP as the sequence of the port indices of the CSI-RS resource from the second TRP, and each set of default port indices is provided per rank.
The method of claim 28, wherein for the CSI-RS resource from the first TRP that is configured in CSI resource setting linked to the CSI report configuration, default port indices
for rank m are {0, …, m-1} , wherein rank m=1, 2, …, RI _max, and RI _max=min (8, P) , and P is the number of ports in the CSI-RS resource.
The method of claim 28, wherein for the CSI-RS resource from the second TRP that is configured in CSI resource setting linked to the CSI report configuration, the default port indices
for rank n are { (n) mod P, …, (2·n-1) mod P} , wherein rank n=1, 2, …, RI _max , and RI _max=min (8, P) , and P is the number of ports in the CSI-RS resource.
The method of claim 1, wherein the sequence of the port indices of the CSI-RS resource from the first TRP comprises indicated port indices of the CSI-RS resource from the first TRP, and the sequence of the port indices of the CSI-RS resource from the second TRP comprises indicated port indices of the CSI-RS resource from the second TRP; and

if the UE is configured with the CSI report configuration with report quantity set to 'cri-RI-CQI' , the UE determines a rank for transmission from the first TRP based on the indicated port indices of the CSI-RS resource from the first TRP and a rank for transmission from the second TRP based on the indicated port indices of the CSI-RS resource from the second TRP, the rank for transmission from the first TRP is referred to as a rank of the first TRP, and the rank for transmission from the second TRP is referred to as a rank of the second TRP.
The method of claim 31, wherein for rank calculation of the rank of the first TRP, for a dedicated rank m, the first m columns of an identity matrix are applied on the indicated port indices of CSI-RS resource from the first TRP associated with rank m, and rank m=1, 2, …, RI _max, and RI _max=min (8, P) , and P is the number of ports in the CSI-RS resource, and the UE determines the rank of the first TRP from all potential ranks based a dedicated criterion; for rank calculation of the rank of the second TRP, for a dedicated rank n, the first n columns of an identity matrix are applied on the indicated port indices of CSI-RS resource from the second TRP associated with rank n, and rank n=1,2, …, RI _max , and RI _max=min (8, P) , and P is the number of ports in the CSI-RS resource, and the UE determines the rank from all the potential ranks based a dedicated criterion; and

the UE determines a rank of multi-TRP associated with the first TRP and the second TRP as a sum of the determined rank of the first TRP and the determined rank of the second TRP.
The method of claim 31, wherein the UE directly reports the determined ranks for the first TRP and the second TRP to the base station.
The method of claim 31, wherein in the related rank combinations of rank m of multi-TRP, a first element in a related rank combination represents a determined rank of the first TRP, a second element in a related rank combination represents a determined rank of the second TRP;

a matched related rank combination of the determined rank of multi-TRP is a related rank combination identical to a combination of the determined rank of the first TRP plus has the determined rank of the first TRP, a corresponding element rank m of the determined rank of multi-TRP is a value of rank m that is associated with a matched related rank combination of the determined rank of multi-TRP and the determined rank of multi-TRP has a rank indictor (RI) value equal to m;

when the determined rank of multi-TRP has only one corresponding element, the UE reports the corresponding element as the reported rank of multi-TRP;

when the determined rank of multi-TRP has a plurality of corresponding elements, the UE reports the smallest corresponding element in the plurality of corresponding elements as the reported rank of multi-TRP; and

when the determined rank of multi-TRP has no corresponding element, the UE discards the determined rank of multi-TRP.
The method of claim 31, wherein when calculating a CQI for the reported rank of the first TRP, the UE uses the indicated the port indices of CSI-RS resource from the first TRP associated with the reported rank of the first TRP; and

when calculating a CQI for the reported rank of the second TRP, the UE uses the indicated port indices of CSI-RS resource from the second TRP associated with the reported rank of the second TRP.
The method of claim 35, wherein for a precoder V ₁ of the first TRP, for a reported rank m of the first TRP, the first m columns of an identity matrix are applied on the indicated port indices of the CSI-RS resource from the first TRP associated with rank m, the UE estimates a channel between the first TRP and the UE based on the CSI-RS resource from the first TRP and obtains a channel estimation matrix H ₁ representing the channel between the first TRP and the UE;

for a precoder V ₂ of the second TRP, for a reported rank n of the second TRP, the first n columns of an identity matrix are applied on the indicated port indices of the CSI-RS resource from the second TRP associated with rank n, the UE estimates a channel between the second TRP and the UE based on the CSI-RS resource from the second TRP and obtains a channel estimation matrix H ₂ representing the channel between the second TRP and the UE; and

the UE calculates the CQI for the reported rank of the first TRP based on the precoderV ₁ and the channel estimation matrix H ₁ and calculates the CQI for the reported rank of the second TRP based on the precoderV ₂ the channel estimation matrix H ₂.
The method of claim 1, wherein for CSI reporting associated with single-TRP and multi-TRP measurement hypotheses, if the UE is configured with the CSI report configuration with report quantity set to 'cri-RI-CQI' , and if non-PMI based CSI measurement and reporting is applied in single-TRP and multi-TRP/panel measurement hypotheses, RI sharing between single-TRP and multi-TRP measurement hypotheses is enabled.
The method of claim 1, wherein for CSI reporting associated with single-TRP and multi-TRP measurement hypotheses, if the UE is configured with the CSI report configuration with the report quantity set to 'cri-RI-CQI' , and if non-PMI based CSI measurement and reporting is applied in single-TRP and multi-TRP/panel measurement hypotheses, and if a number of ports and port indices of a CSI-RS resource for single-TRP measurement and a number of ports and port indices of a CSI-RS resource for multi-TRP measurement are the same, RI sharing between single-TRP and multi-TRP measurement hypotheses is enabled.
The method of claim 1, wherein for CSI reporting associated with single-TRP and multi-TRP measurement hypotheses, if the UE is configured with the CSI report configuration with the report quantity set to 'cri-RI-CQI' , and if non-PMI based CSI measurement and reporting is applied in single-TRP and multi-TRP/panel measurement hypotheses, and if a rank indicator (RI) for single-TRP and a RI for multi-TRP measurement are the same, RI sharing between single-TRP and multi-TRP measurement hypotheses is enabled.
The method of claim 1, wherein for CSI reporting associated with single-TRP and multi-TRP measurement hypotheses, if the UE is configured with the CSI report configuration with report quantity set to 'cri-RI-CQI' , and if non-PMI based CSI measurement and reporting is applied in single-TRP and multi-TRP/panel measurement hypotheses, and if a number of ports and port indices of a CSI-RS resource for single-TRP measurement and a number of ports and port indices of a CSI-RS resource for multi-TRP measurement are the same, CQI sharing between single-TRP and multi-TRP measurement hypotheses is enabled.
A user equipment (UE) comprising:

a processor, configured to call and run a computer program stored in a memory, to cause a device in which the chip is installed to execute the method of any of claims 1 to 40.
A chip, comprising:

a processor, configured to call and run a computer program stored in a memory, to cause a device in which the chip is installed to execute the method of any of claims 1 to 40.
A computer readable storage medium, in which a computer program is stored, wherein the computer program causes a computer to execute the method of any of claims 1 to 40.
A computer program product, comprising a computer program, wherein the computer program causes a computer to execute the method of any of claims 1 to 40.
A computer program, wherein the computer program causes a computer to execute the method of any of claims 1 to 40.
A method for channel state information (CSI) measurement, executable in a base station, comprising:

transmitting a CSI report configuration to a user equipment (UE) through a downlink, wherein the CSI report configuration comprises a sequence of port indices of a CSI-RS resource from a first TRP among port indices for the first TRP, the sequence of the port indices of the CSI-RS resource from the first TRP is configured, the CSI report configuration comprises a sequence of port indices of a CSI-RS resource from a second TRP among port indices for the second TRP, and the sequence of the port indices of the CSI-RS resource from the second TRP is configured; and receiving CSI measurement for the first TRP that is based on the port indices for the first TRP and CSI measurement for the second TRP that is based on the port indices for the second TRP.
The method of claim 46, wherein in the CSI report configuration, only one higher layer parameter of non-PMI port indication parameter method for CSI measurement is configured, the port indices of the CSI-RS resource from the first TRP are configured in the non-PMI port indication parameter, and a set of offset values are indicated to determine the port indices of the CSI-RS resource from the second TRP.
The method of claim 47, wherein if the UE is configured with the CSI report configuration with report quantity set to 'cri-RI-CQI' , the sequence of port indices of the CSI-RS resource from the first TRP is configured in the non-PMI port indication parameter and the sequence of port indices of the CSI-RS resource from the second TRP is determined based on the sequence of port indices for the first TRP and RI _max offset values, and the offset values are provided per rank.
The method of claim 48, wherein the offset values are pre-defined or signaled by DCI, MAC CE, or RRC.
The method of claim 48, wherein RI _max=min (8, P) , and P is a number of ports in the CSI-RS resource.
The method of claim 48, wherein port indices of CSI-RS resources transmitted from the first TRP are configured and the port indices for each CSI-RS resource are configured based on order arrangement of an associated CSI-RS resource index in CSI resource setting indicated by resources for channel measurement parameter linked to the CSI report configuration.
The method of claim 51, wherein in the port indices for each CSI-RS resource, port indices of m ports are indicated in arrangement of layer ordering for rank m, the port indices of the m port are indicated in the CSI report configuration as:
wherein
are the CSI-RS port indices of the m port for rank m, and R∈ {1, 2, …, RI _max} , and RI _max=min (8, P) , and P is the number of ports in the CSI-RS resource.
The method of claim 52, wherein for the CSI-RS resource from the second TRP that is configured in the CSI resource setting linked to the CSI report configuration, the port indices
for rank m are
wherein offset _(m-1) is an offset associated with rank m, rank m=1, 2, …, RI _max, and RI _max=min (8, P) , and P is the number of ports in the CSI-RS resource.
The method of claim 46, wherein in the CSI report configuration, only one higher layer parameter of non-PMI port indication parameter is configured, the port indices of a CSI-RS resource from the first TRP and the port indices of a CSI-RS resource from the second TRP are configured in the same non-PMI port indication parameter.
The method of claim 54, wherein the port indices for the same rank for CSI-RS resources from different TRPs are the same.
The method of claim 54, wherein if the UE is configured with the CSI report configuration with report quantity set to 'cri-RI-CQI' , the sequence of port indices corresponding to at least 2 CSI-RS resources is configured in the non-PMI port indication parameter, the sequence of the port indices of the CSI-RS resource from the first TRP and the sequence of the port indices of the CSI-RS resource from the second TRP are configured in the non-PMI port indication parameter.
The method of claim 56, wherein in the port indices for each CSI-RS resource, port indices of m ports are indicated in arrangement of layer ordering for rank m, the port indices of the m port are indicated as:
wherein
are the CSI-RS port indices of the m port for rank m, and R∈ {1, 2, …, RI _max} , and RI _max=min (8, P) , and P is the number of ports in the CSI-RS resource.
The method of claim 56, wherein the non-PMI port indication parameter determines a combined sequence of port indices, and the combined sequence of port indices is divided into two groups including a first group and a second group, wherein the first group of port indices comprises the sequence of the port indices of the CSI-RS resource from the first TRP and the second group of port indices comprises the sequence of the port indices of the CSI-RS resource from the second TRP.
The method of claim 58, wherein for the first group of port indices for the first TRP, port indices of up to K1 CSI-RS resources are configured, and the port indices for each CSI-RS resource are configured based on order arrangement of the associated CSI-RS resource index in CSI resource setting indicated by resources for channel measurement parameter linked to the CSI report configuration, wherein the CSI-RS resources are transmitted from the first TRP; and

for the second group of port indices for the second TRP, port indices of up to K2 CSI-RS resources are configured, and the port indices for each CSI-RS resource are configured based on order arrangement of the associated CSI-RS resource index in CSI resource setting indicated by resources for channel measurement parameter linked to the CSI report configuration, wherein the CSI-RS resources are transmitted from the second TRP.
The method of claim 59, wherein in the port indices for each CSI-RS resource, port indices of m ports are indicated in arrangement of layer ordering for rank m, the port indices of the m port are indicated as:
wherein
are the CSI-RS port indices for rank m, and R∈ {1, 2, …, RI _max} , and RI _max=min (8, P) , and P is the number of ports in the CSI-RS resource.
The method of claim 46, wherein the sequence of the port indices of the CSI-RS resource from the first TRP is configured in a first non-PMI port indication parameter, and the sequence of the port indices of the CSI-RS resource from the second TRP is configured in a second non-PMI port indication parameter.
The method of claim 61, wherein the port indices for the same rank for CSI-RS resources from different TRPs are the same.
The method of claim 61, wherein if the UE is configured with the CSI report configuration with report quantity set to 'cri-RI-CQI' , the first non-PMI port indication parameter and the second non-PMI port indication parameter are included in the CSI report configuration.
The method of claim 63, wherein in the sequence of the port indices of the CSI-RS resource from the first TRP, port indices of up to K1 CSI-RS resources are configured and the port indices for each CSI-RS resource are configured based on order arrangement of the associated CSI-RS resource index in CSI resource setting indicated by resources for channel measurement parameter linked to the CSI report configuration, wherein the CSI-RS resources are transmitted from the first TRP, in the port indices for each CSI-RS resource, port indices of m ports are indicated in arrangement of layer ordering for rank m, the port indices of the m port are indicated as:
wherein
are the CSI-RS port indices for rank m, and R∈ {1, 2, …, RImax} , and RImax=min (8, P) , and P is the number of ports in the CSI-RS resource; and

in the sequence of the port indices of the CSI-RS resource from the second TRP, port indices of up to K2 CSI-RS resources are configured and the port indices for each CSI-RS resource are configured based on order arrangement of the associated CSI-RS resource index in CSI resource setting indicated by resources for channel measurement parameter linked to the CSI report configuration, wherein the CSI-RS resources are transmitted from the second TRP, in the port indices for each CSI-RS resource, port indices of m ports are indicated in arrangement of layer ordering for rank m, the port indices of the m port are indicated as:
wherein
are the CSI-RS port indices for rank m, and R∈ {1, 2, …, RI _max} , and RI _max=min (8, P) , and P is the number of ports in the CSI-RS resource.
The method of claim 46, wherein a first non-PMI port indication parameter and a first port index for eight ranks parameter are used for indicating the sequence of the port indices of the CSI-RS resource from the first TRP, and a second non-PMI port indication parameter and a second port index for eight ranks parameter are used for indicating the sequence of the port indices of the CSI-RS resource from the second TRP.
The method of claim 65, wherein if the UE is configured with the CSI report configuration with report quantity set to 'cri-RI-CQI' , the second non-PMI port indication parameter and the second port index for eight ranks parameter are included in the CSI report configuration.
The method of claim 66, wherein in the sequence of port indices for the first TRP, port indices of up to K1 CSI-RS resources are configured and the port indices for each CSI-RS resource are configured based on order arrangement of the associated CSI-RS resource index in CSI resource setting indicated by resources for channel measurement parameter linked to the CSI report configuration, wherein the CSI-RS resources are transmitted from the first TRP, in the port indices for each CSI-RS resource, port indices of m ports are indicated in arrangement of layer ordering for rank m, the port indices of the m port are indicated as:
wherein
are the CSI-RS port indices for rank m, and R∈ {1, 2, …, RI _max} , and RI _max=min (8, P) , and P is the number of ports in the CSI-RS resource; and

in the sequence of port indices for the second TRP, port indices of up to K2 CSI-RS resources are configured and the port indices for each CSI-RS resource are configured based on order arrangement of the associated CSI-RS resource index in CSI resource setting indicated by resources for channel measurement parameter linked to the CSI report configuration, wherein the CSI-RS resources are transmitted from the second TRP, in the port indices for each CSI-RS resource, port indices of m ports are indicated in arrangement of layer ordering for rank m, the port indices of the m port are indicated as:
wherein
are the CSI-RS port indices for rank n, and R∈ {1, 2, …, RI _max} , and RI _max=min (8, P) , and P is the number of ports in the CSI-RS resource.
The method of claim 46, wherein a set of default port indices is provided for the first TRP as the sequence of the port indices of the CSI-RS resource from the first TRP, and a set of offset values is provided for the second TRP and utilized to determine the sequence of the port indices of the CSI-RS resource from the second TRP.
The method of claim 68, wherein if the UE is configured with the CSI report configuration with report quantity set to 'cri-RI-CQI' and the higher layer parameter of non-PMI port indication parameter is not configured, the set of default port indices is provided for the first TRP, and a number RI _max of offset values are indicated to determine the sequence of the port indices of the CSI-RS resource from the second TRP, wherein the offset values are provided per rank.
The method of claim 69, wherein the offset values are pre-defined or signaled by DCI, MAC CE, or RRC.
The method of claim 69, wherein for the CSI-RS resource from the first TRP that is configured in CSI resource setting linked to the CSI report configuration, default port indices
for rank m are {0, …, m-1} , wherein rank m=1, 2, …, RI _max, and RI _max=min (8, P) , and P is the number of ports in the CSI-RS resource.
The method of claim 69, wherein for the CSI-RS resource from the second TRP that is configured in CSI resource setting linked to the CSI report configuration, port indices
for rank n are { (0+offset _(n-1) ) mod P, …, ( (n-1) +offset _(n-1) ) mod P} , wherein rank n=1, 2, …, RI _max , and RI _max=min (8, P) , and P is the number of ports in the CSI-RS resource.
The method of claim 46, wherein if the UE is configured with the CSI report configuration with report quantity set to 'cri-RI-CQI' and the higher layer parameter of non-PMI port indication parameter is not configured, a first set of default port indices is provided for the first TRP as the sequence of the port indices of the CSI-RS resource from the first TRP, a second set of default port indices is provided for the second TRP as the sequence of the port indices of the CSI-RS resource from the second TRP, and each set of default port indices is provided per rank.
The method of claim 73, wherein for the CSI-RS resource from the first TRP that is configured in CSI resource setting linked to the CSI report configuration, default port indices
for rank m are {0, …, m-1} , wherein rank m=1, 2, …, RI _max, and RI _max=min (8, P) , and P is the number of ports in the CSI-RS resource.
The method of claim 73, wherein for the CSI-RS resource from the second TRP that is configured in CSI resource setting linked to the CSI report configuration, the default port indices
for rank n are { (n) mod P, …, (2·n-1) mod P} , wherein rank n=1, 2, …, RI _max , and RI _max=min (8, P) , and P is the number of ports in the CSI-RS resource.
The method of claim 46, wherein for CSI reporting associated with single-TRP and multi-TRP measurement hypotheses, if the UE is configured with the CSI report configuration with report quantity set to 'cri-RI-CQI' , and if non-PMI based CSI measurement and reporting is applied in single-TRP and multi-TRP/panel measurement hypotheses, RI sharing between single-TRP and multi-TRP measurement hypotheses is enabled.
The method of claim 46, wherein for CSI reporting associated with single-TRP and multi-TRP measurement hypotheses, if the UE is configured with the CSI report configuration with the report quantity set to 'cri-RI-CQI' , and if non-PMI based CSI measurement and reporting is applied in single-TRP and multi-TRP/panel measurement hypotheses, and if a number of ports and port indices of a CSI-RS resource for single-TRP measurement and a number of ports and port indices of a CSI-RS resource for multi-TRP measurement are the same, RI sharing between single-TRP and multi-TRP measurement hypotheses is enabled.
The method of claim 46, wherein for CSI reporting associated with single-TRP and multi-TRP measurement hypotheses, if the UE is configured with the CSI report configuration with the report quantity set to 'cri-RI-CQI' , and if non-PMI based CSI measurement and reporting is applied in single-TRP and multi-TRP/panel measurement hypotheses, and if a rank indicator (RI) for single-TRP and a RI for multi-TRP measurement are the same, RI sharing between single-TRP and multi-TRP measurement hypotheses is enabled.
The method of claim 46, wherein for CSI reporting associated with single-TRP and multi-TRP measurement hypotheses, if the UE is configured with the CSI report configuration with report quantity set to 'cri-RI-CQI' , and if non-PMI based CSI measurement and reporting is applied in single-TRP and multi-TRP/panel measurement hypotheses, and if a number of ports and port indices of a CSI-RS resource for single-TRP measurement and a number of ports and port indices of a CSI-RS resource for multi-TRP measurement are the same, CQI sharing between single-TRP and multi-TRP measurement hypotheses is enabled.
A base station comprising:

a processor, configured to call and run a computer program stored in a memory, to cause a device in which the chip is installed to execute the method of any of claims 46 to 79.
A chip, comprising:

a processor, configured to call and run a computer program stored in a memory, to cause a device in which the chip is installed to execute the method of any of claims 46 to 79.
A computer readable storage medium, in which a computer program is stored, wherein the computer program causes a computer to execute the method of any of claims 46 to 79.
A computer program product, comprising a computer program, wherein the computer program causes a computer to execute the method of any of claims 46 to 79.
A computer program, wherein the computer program causes a computer to execute the method of any of claims 46 to 79.