CN109413691B

CN109413691B - Method and device for reporting channel state information

Info

Publication number: CN109413691B
Application number: CN201710773402.9A
Authority: CN
Inventors: 付景兴; 喻斌; 钱辰; 孙霏菲; 熊琦
Original assignee: Samsung Electronics Co Ltd
Current assignee: Samsung Electronics Co Ltd
Priority date: 2017-08-18
Filing date: 2017-08-31
Publication date: 2023-12-08
Anticipated expiration: 2037-08-31
Also published as: CN109413691A

Abstract

The application discloses a method for reporting Channel State Information (CSI), which comprises the following steps: a User Equipment (UE) selects at least one bandwidth part (BWP) from the configured BWP; the UE calculates a CSI report according to the selected BWP; the UE sends CSI reports to the base station. The application also discloses a device for reporting the CSI. By applying the technical scheme disclosed by the application, normal reporting of the CSI report can be ensured in a transmission system of a new air interface.

Description

Method and device for reporting channel state information

Technical Field

The present application relates to the field of wireless communications technologies, and in particular, to a method and an apparatus for reporting channel state information.

Background

In order for the base station to learn the downlink channel quality, a User Equipment (UE) reports channel state information (CSI, channel State Information) to the base station. The CSI reports include periodic CSI reports and aperiodic CSI reports. Wherein, the periodic CSI report is reported according to the period and time offset configured by the higher layer signaling, the aperiodic CSI report is driven by the CSI request information in the downlink control information (DCI, downlink Control Information) of the base station scheduling physical uplink shared channel (PUSCH, physical Uplink Shared Channel), and the UE sends the aperiodic CSI report to the base station of the serving cell according to the indication of the CSI request information. The CSI described herein may include: channel quality indication (CQI, channel Quality Indicator), precoding matrix indication (PMI, precoding Matrix Indicator), rank Indication (RI), etc.

On the New air interface (NR), the Bandwidth of one serving cell may be large, while the UE capability may not support the entire Bandwidth of the serving cell, but only a Part of the entire Bandwidth of the serving cell, so that the UE may be configured with multiple Bandwidth parts (BWP), and only one active BWP is at the same time, other BWP are inactive BWP, and different active BWP may be available at different moments, i.e.: the activated BWP may be shifted at different moments in time as shown in fig. 1. In this case, how to report CSI is a problem that needs to be studied.

Disclosure of Invention

The application provides a method for reporting channel state information, which can ensure normal reporting of a CSI report in a transmission system of a new air interface.

The application discloses a method for reporting Channel State Information (CSI), which comprises the following steps:

the user equipment UE selects at least one BWP from the configured bandwidth part BWP;

the UE calculates a CSI report according to the selected BWP;

the UE sends CSI reports to the base station.

Preferably, the CSI report is an aperiodic CSI report, and one aperiodic CSI report includes only one aperiodic CSI report calculated according to channel and interference conditions within one BWP.

Preferably, the UE selecting at least one BWP from the configured BWP comprises:

the UE selects an activated BWP from the configured BWP; the activated BWP is an activated BWP in a serving cell that requires reporting of the aperiodic CSI report in a slot in which DCI driving the aperiodic CSI report is transmitted;

alternatively, the UE selects one BWP with the best channel quality from the configured BWP.

Preferably, the CSI report is an aperiodic CSI report, and one aperiodic CSI report includes at least two aperiodic CSI reports calculated according to channel and interference conditions within at least two BWPs.

Preferably, the UE selects at least one BWP from the configured BWP, including one of:

the UE selects an activated BWP from the configured BWP and selects at least one BWP with the best channel quality from the configured BWP; the activated BWP is an activated BWP in a serving cell that requires reporting of the aperiodic CSI report in a slot in which DCI driving the aperiodic CSI report is transmitted;

the UE selects at least two BWP from the configured BWP according to the configuration of the higher layer signaling and the indication of the physical layer signaling;

the UE selects at least two BWP with the best channel quality from the configured BWP.

Preferably, the CSI report is a periodic CSI report, and only one set of periodic CSI report reporting is configured, and one periodic CSI report only includes periodic CSI reports calculated according to the channel and interference conditions in the activated BWP;

the UE selecting at least one BWP from the configured BWP comprises: the UE selects an active BWP from the configured BWP.

Preferably, the CSI report is a periodic CSI report, and at least two sets of periodic CSI report reports are configured, wherein one set of periodic CSI reports is calculated according to channels and interference conditions in activated BWP in the configured BWP, and the rest of periodic CSI reports are calculated according to channels and interference conditions in at least one inactive BWP in the configured BWP or according to channels and interference conditions in all BWP.

Preferably, the method further comprises: and the UE determines a channel state information reference signal (CSI-RS) resource according to the aperiodic CSI report and receives a corresponding CSI-RS.

Preferably, the UE receiving the corresponding CSI-RS includes one of:

when the UE receives the aperiodic CSI-RS driving, the UE respectively receives the CSI-RSs in all BWPs configured by the UE or the CSI-RSs in a part of BWPs designated in all the BWPs configured by the UE in different downlink time slots;

UE receives CSI-RS resources of a periodical CSI report;

the UE preferentially receives CSI-RS in the BWP with the closest aperiodic CSI reporting interval in the order of the set BWP sequence numbers.

Preferably, the method further comprises: and the UE determines the CSI-RS resource according to the set of periodic CSI reports and receives the corresponding CSI-RS.

Preferably, the UE receiving the corresponding CSI-RS includes:

and receiving the CSI-RS in a time slot corresponding to the activated BWP in the configured BWP according to the configuration of the set of periodic CSI reports.

Preferably, the method further comprises: and the UE determines the CSI-RS resources according to the at least two sets of periodic CSI reports and receives corresponding CSI-RSs.

Preferably, the UE receiving the corresponding CSI-RS includes:

according to the configuration of the two sets of periodic CSI reports, a set of CSI-RS is received in a slot corresponding to an activated BWP in the configured BWP, and the rest of CSI-RS is received in a slot corresponding to an activated BWP or a non-activated BWP in the configured BWP.

The application also discloses a device for reporting the CSI, which comprises:

a BWP selection module for selecting at least one BWP from the at least one BWP configured by the device;

a CSI calculation module for calculating CSI reports according to the selected BWP;

and the CSI reporting module is used for sending the CSI report to the base station.

As can be seen from the above technical solution, the present application ensures normal reporting of CSI reports in a transmission system of a new air interface by selecting at least one BWP from the configured at least one BWP by the UE for calculating CSI, determining a method for calculating CSI according to the type of the selected BWP, further calculating CSI, and transmitting CSI reports to the base station.

Drawings

Fig. 1 is a schematic diagram of a BWP structure in a conventional serving cell;

FIG. 2 is a schematic diagram of a basic flow of a method for reporting CSI according to the present application;

fig. 3 is a schematic diagram illustrating calculation of aperiodic CSI report according to activated BWP according to the first embodiment of the present application;

fig. 4 is a schematic diagram showing different BWP activated at different moments in time according to an embodiment of the present application;

fig. 5 is a schematic diagram of calculating periodic CSI reports according to activated BWP in a second embodiment of the present application;

fig. 6 is a schematic diagram of BWP according to which 2 sets of periodic CSI reports are respectively reported in the second embodiment of the present application;

fig. 7 is a schematic diagram of time instants for reporting self-contained CSI reports and non-self-contained CSI reports according to a second embodiment of the present application;

fig. 8 is a schematic diagram of a UE receiving CSI-RS at all BWP at different times in the third embodiment of the present application;

fig. 9 is a schematic diagram of a UE receiving CSI-RS at a part of BWP at different moments in time in the third embodiment of the present application;

fig. 10 is a schematic diagram of a time slot in which CSI-RS resources of each BWP in the third embodiment of the present application are located;

fig. 11 is a schematic diagram of a UE preferentially receiving CSI-RS in a BWP with a closest aperiodic CSI report interval in order of the BWP sequence numbers from large to small in the third embodiment of the present application;

fig. 12 is a schematic diagram of transmitting CSI-RS on only one BWP at the same time in the fourth embodiment of the present application;

fig. 13 is a schematic diagram of transmitting CSI-RS in a time division multiplexing manner in a plurality of BWPs in a time window according to a fourth embodiment of the present application;

FIG. 14 is a schematic diagram of a cycle gap configured in accordance with a fifth embodiment of the present application;

fig. 15 is a schematic diagram of a UE detecting CORESET and receiving PDSCH in a fifth method according to the present application;

fig. 16 is a schematic diagram of a UE not detecting CORESET at CORESET when CORESET of slot n overlaps with gap in the fifth method of the present application;

fig. 17 is a schematic diagram of a UE detecting CORESET at CORESET when CORESET and gap of slot n are not overlapped in the fifth method of the present application;

fig. 18 is a schematic diagram illustrating a basic structure of a preferred CSI reporting apparatus according to the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail below by referring to the accompanying drawings and examples.

When the UE is configured with at least one BWP and only one BWP is activated at the same time, the UE can receive only data and reference signals of one BWP at the same time.

Fig. 2 is a basic flowchart of a method for reporting CSI according to the present application, as shown in fig. 2, and the method includes the following steps:

step 201: the UE selects at least one BWP from the configured at least one BWP.

Step 202: the UE calculates CSI reports according to the BWP selected in step 201.

Here, a method of calculating the CSI report may be first determined according to the type of the BWP, and then the CSI report may be calculated according to the determined method. Wherein the type of BWP refers to whether BWP is an active BWP or an inactive BWP.

Step 203: the UE transmits the calculated CSI report to the base station.

The technical scheme of the application is further described in detail through several preferred embodiments. The present application is a method for how to report CSI measurements or Radio Resource Management (RRM) measurements in case that a UE is configured with active BWP and inactive BWP. CSI measurement or Radio Resource Management (RRM) measurement on active BWP and inactive BWP is performed independently, and since the base station transmits PDCCH and PDSCH on active BWP, the period of CSI report is short and the accuracy is high, and the base station does not transmit PDCCH and PDSCH on inactive BWP, but candidate resources, so the period of CSI report can be longer, and the influence on active BWP can be reduced. The CSI measured on the inactive BWP and the CSI measured on the active BWP are described below using periodic CSI and aperiodic CSI, respectively, as an example. In addition, CSI and RRM measured on the inactive BWP may also be reported using event driven methods.

Embodiment one:

the present embodiment mainly describes a method of selecting BWP for calculating CSI and a method of calculating CSI based on the selected BWP in aperiodic CSI report.

The method comprises the following steps:

only aperiodic CSI reports calculated according to channel and interference conditions within one BWP are included in one aperiodic CSI report. For example, the UE may be configured with 4 downlink BWPs, BWP-1, BWP-2, BWP-3, BWP-4, respectively, where one aperiodic CSI report is computed based on the channel and interference situation within BWP-2. Based on the first method, in case that the UE is configured with a plurality of downlink BWP, the following modes of BWP selection are used according to each aperiodic CSI report calculation.

Mode one:

the BWP according to which the aperiodic CSI report is calculated is an activated BWP among the plurality of BWP configured by the UE. The aperiodic CSI report is driven by CSI request information in DCI scheduling PUSCH, and the activated BWP is an activated BWP in a serving cell where the aperiodic CSI report is required to be reported in a slot in which DCI driving the aperiodic report is transmitted. For example, assuming that the UE configures 2 serving cells, serving cell one and serving cell two, respectively, and 4 downlink BWP, BWP-1, BWP-2, BWP-3, BWP-4, respectively, DCI scheduling PUSCH of serving cell one drives aperiodic CSI reporting that is to report aperiodic CSI reporting of serving cell one and aperiodic CSI reporting of serving cell two simultaneously in time slot n, BWP-2 being active BWP in serving cell two, the aperiodic CSI reporting of serving cell two is calculated according to channel and interference conditions within BWP-2, as shown in fig. 3. The aperiodic CSI report includes at least CQI, optionally RI and/or PMI, and the parameters included in the CSI report are calculated according to the channel and interference conditions in the activated BWP. The active BWP is determined according to the channel quality and the light and heavy conditions of the frequency load, and reporting the CSI of the active BWP is more helpful to provide effective support for resource scheduling of the base station.

Mode two:

the BWP according to which the aperiodic CSI report is calculated is the BWP with the best channel quality selected by the UE from the plurality of BWPs configured by the UE, where the aperiodic CSI report includes at least CQI, optionally RI and/or PMI, and the parameters in the CSI report are calculated according to the channel and interference conditions in the BWP with the best channel quality selected by the UE. For example, the UE configures 4 downlink BWPs, BWP-1, BWP-2, BWP-3, BWP-4, and the aperiodic CSI report is calculated according to the channel and interference situation in the BWP with the best channel quality selected by the UE from BWP-1, BWP-2, BWP-3, BWP-4. If BWP-3 is the BWP with the best channel quality selected by the UE, the aperiodic CSI report is calculated based on the channel and interference conditions within BWP-3. In this way, while reporting the CSI of the BWP, the sequence number of the BWP with the best channel quality needs to be reported, for example, the UE configures 4 downlink BWP, BWP-1, BWP-2, BWP-3, BWP-4, respectively, and then 2 bits of information is needed to indicate the BWP with the best channel quality selected by the UE from among the 4 BWP. A specific mapping relationship between the information indication value and the BWP with the best channel quality is shown in table 1, for example. Reporting the CSI of the BWP with the best channel quality is more helpful to schedule the resources with the best channel quality for the UE for the base station, thereby improving the spectrum efficiency.

Table 1: mapping relation between information indication value and best BWP

Information indication value	bWP with best channel quality
		00	BWP-1
01	BWP-2
		10	BWP-3
11	BWP-4

The second method is as follows:

the aperiodic CSI report of at least two BWP calculated according to channel and interference conditions within at least two BWP is included in one aperiodic CSI report, and the format of the aperiodic CSI report of the at least two BWP may be different, for example, the CSI report of one BWP includes only CQI and the CSI report of the other BWP includes CQI and/or RI and/or PMI. Based on the second method, in case that the UE is configured with at least two downlink BWP, the following options of BWP according to which each aperiodic CSI report is calculated are available.

Mode one:

the aperiodic CSI report includes aperiodic CSI reports of at least two BWPs calculated according to channel and interference conditions within the at least two BWPs. One of which is an aperiodic CSI report of an activated BWP, and the other aperiodic CSI report is an aperiodic CSI report of a portion of BWP with the best channel quality selected from the BWPs configured by the UE, which will be described in detail below.

For aperiodic CSI reports calculated from activated BWP among at least two BWP configured by the UE, the aperiodic CSI reports are driven by CSI request information in DCI scheduling PUSCH, and the activated BWP is in a slot in which DCI driving the aperiodic reports is transmitted, requiring reporting of the activated BWP in a serving cell of the aperiodic CSI reports. For example, assuming that the UE configures 2 serving cells, serving cell one and serving cell two, respectively, and 4 downlink BWP, BWP-1, BWP-2, BWP-3, BWP-4, respectively, DCI scheduling PUSCH of serving cell one drives aperiodic CSI reporting that is to report aperiodic CSI reporting of serving cell one and aperiodic CSI reporting of serving cell two simultaneously in time slot n, BWP-2 being active BWP in serving cell two, the aperiodic CSI reporting of serving cell two is calculated according to channel and interference conditions within BWP-2, as shown in fig. 3. The aperiodic CSI report includes at least CQI, and may further include RI and/or PMI, and parameters in the CSI report are calculated according to the channel and interference conditions in the activated BWP.

For the aperiodic CSI report calculated according to the N (N is a positive integer greater than or equal to 1) BWP with the best channel quality selected by the UE from the configured at least two BWP, the UE may preset the value of N by receiving the higher layer signaling configuration or protocol, the aperiodic CSI report includes at least CQI, and may further include RI and/or PMI, and the parameters in the CSI report are calculated according to the channel and interference conditions in the N BWP with the best channel quality selected by the UE. For example, the UE configures 4 downlink BWPs, BWP-1, BWP-2, BWP-3, BWP-4, and the aperiodic CSI report is calculated according to the channel and interference situation in the BWP with the best channel quality selected by the UE from BWP-1, BWP-2, BWP-3, BWP-4. If BWP-3 is the BWP with the best channel quality selected by the UE, the aperiodic CSI report is calculated according to the channel and interference conditions within BWP-3, for example, the aperiodic CSI report may include only CQI, and the aperiodic CSI report is reported to the base station in order to select one BWP with the best CQI from the BWP, and the base station selects the active BWP according to the information. In this way, the CSI report is reported and the BWP sequence number with the best channel quality needs to be reported at the same time.

Mode two:

the aperiodic CSI report includes aperiodic CSI reports of at least two BWPs calculated according to channel and interference conditions within the at least two BWPs. The BWP for calculating the aperiodic CSI report is determined by a combined method of higher layer signaling configuration and physical layer signaling indication. The physical layer signaling may be specific BWP indication information or may determine BWP for calculating the aperiodic CSI report by re-interpreting the CSI request information. For example, the higher layer signaling configures 4 BWPs for the UE, BWP-1, BWP-2, BWP-3, BWP-4, respectively, and then the higher layer signaling configures a set of 2 BWPs, BWP set 1 including BWP-1 and BWP-2, BWP set 2 including BWP-1, BWP-2, BWP-3, and BWP-4, includes 1-bit BWP indication information in the DCI driving the aperiodic CSI, includes an aperiodic CSI report of the BWPs in BWP set 1 in the aperiodic CSI report when the BWP indication information value is '0', and includes an aperiodic CSI report of the BWPs in BWP set 2 when the BWP indication information value is '1'.

Alternatively, the CSI process of the serving cell, to which the aperiodic CSI report corresponds, and the BWP of the serving cell configured with the plurality of BWPs, which reports the aperiodic CSI, are jointly determined by re-interpreting the CSI request information. For example, when the CSI request information includes 2 bits, a serving cell to which the aperiodic CSI report corresponds, a CSI process of the serving cell, and BWP of the serving cell are determined in the manner of table 2.

Table 2: correspondence between CSI request information values and BWP included in CSI report

Mode three:

the aperiodic CSI report includes aperiodic CSI reports of at least two BWPs calculated according to channel and interference conditions within the at least two BWPs. The aperiodic CSI report is an aperiodic CSI report of a portion of BWP with the best channel quality selected from the BWP configured by the UE. The BWP according to which the aperiodic CSI report is calculated is N (N is a positive integer greater than or equal to 1, where N is a value preset by the UE through receiving a higher layer signaling configuration or protocol) where the channel quality is the best selected by the UE from the configured bwraps, the aperiodic CSI report includes at least CQI, and may further include RI and/or PMI, and the parameters in the CSI report are calculated according to the channel and interference conditions in the N bwraps where the channel quality is the best selected by the UE. For example, the UE configures 4 downlink BWPs, BWP-1, BWP-2, BWP-3, BWP-4, and the aperiodic CSI report is calculated according to the channel and interference situation in the BWP with the best channel quality selected by the UE from BWP-1, BWP-2, BWP-3, BWP-4, and if BWP-2 and BWP-3 are the BWP with the best channel quality selected by the UE, the aperiodic CSI report is 2 aperiodic CSI reports calculated according to the channel and interference situation in BWP-2 and BWP-3.

Embodiment two:

the present embodiment mainly describes a method of selecting BWP for calculating CSI and a method of calculating CSI based on the selected BWP in the periodic CSI report.

The method comprises the following steps:

only periodic CSI reports calculated from the channel and interference conditions within the activated BWP are included in the periodic CSI report. For example, the UE is configured with 4 downlink BWPs, BWP-1, BWP-2, BWP-3, BWP-4, respectively, wherein the periodic CSI report of one time is a periodic CSI report calculated according to the channel and interference situation within BWP-2. Since only one BWP is active at the same time, the periodic CSI report is a periodic CSI report calculated from the channel and interference conditions within the active BWP. The periodic CSI report has only one configuration of period and time offset, that is, no matter which of the active BWP is, the period and time offset of the periodic CSI report is unchanged, for example, the period of the periodic CSI report is T, and the time offset is T, the periodic CSI report is reported at the time of T, t+t, … …, t+nt, … …, and the active BWP according to which the CSI is calculated at different times may be different, for example, the CSI reported at the time T, t+t is the periodic CSI report calculated according to the channel and interference conditions in the active BWP-1, and the CSI reported at the time t+2t, t+3t is the periodic CSI report calculated according to the channel and interference conditions in the active BWP-3, as shown in fig. 4. Wherein the BWP according to which the CSI report reported at time t is based is calculated by CSI-RS in the BWP activated in the time slot where time t-k-l is located, where the k value is preset by the higher layer signaling configuration or by the protocol, indicating the processing delay of the CSI measurement, i is the smallest and the BWP activated in the time slot where time t-k-l is located has CSI-RS, as shown in fig. 5.

The second method is as follows:

configuring multiple sets of periodic CSI reports, e.g., configuring 2 sets of periodic CSI reports, wherein one set of periodic CSI reports is calculated according to channel and interference conditions in the activated BWP; another set of periodic CSI reports is calculated from the channel and interference conditions within the inactive BWP or another set of periodic CSI reports is calculated from the channel and interference conditions within all BWP. The periods and time offsets of the two sets of periodic CSI reports are respectively configured independently, for example, the period and time offset of the first set of periodic CSI reports are respectively T1 and T1, the period and time offset of the second set of periodic CSI reports are respectively T2 and T2, and T2 may be greater than T1, as shown in fig. 6. The formats of the CSI reports of the active BWP and the inactive BWP may also be different, e.g. the CSI reports of the active BWP comprise CQI, optionally comprising RI and/or PMI, and the CSI reports of the inactive BWP comprise CQI.

One of the sets of periodic CSI reports as described above includes only the periodic CSI report calculated according to the channel and interference conditions within the activated BWP, e.g., the UE configures 4 downlink BWP, BWP-1, BWP-2, BWP-3, BWP-4, respectively, wherein one periodic CSI report is the periodic CSI report calculated according to the channel and interference conditions within the activated BWP-2. Since only one BWP is active at the same time, the periodic CSI report is a periodic CSI report calculated from the channel and interference conditions within the active BWP. The periodic CSI report has only one configuration of period and time offset, that is, no matter which of the active BWP is, the period and time offset of the periodic CSI report is unchanged, for example, the period of the periodic CSI report is T, and the time offset is T, the periodic CSI report is reported at the time of T, t+t, … …, t+nt, … …, and the active BWP according to which the CSI is calculated at different times may be different, for example, the CSI reported at the time T, t+t is the periodic CSI report calculated according to the channel and interference conditions in the active BWP-1, and the CSI reported at the time t+2t, t+3t is the periodic CSI report calculated according to the channel and interference conditions in the active BWP-3, as shown in fig. 4. Wherein the BWP according to which the CSI report reported at time t is based is calculated by CSI-RS in the BWP activated in the time slot where time t-k-l is located, where the k value is preset by the higher layer signaling configuration or by the protocol, indicating the processing delay of the CSI measurement, i is the smallest and the BWP activated in the time slot where time t-k-l is located has CSI-RS, as shown in fig. 5. For the CSI reporting of the active BWP reported by the UE, when the active BWP changes, the first periodic CSI report after BWP activation is to report a self-contained CSI report (the self-contained CSI report described herein is a self-contained CSI report of BWP-1, the time t+t report is a non-self-contained CSI report of BWP-1, the time t+2t report is a self-contained CSI report of BWP-2, and the time t+3t is a non-self-contained CSI report of BWP-2, as shown in fig. 7). Or a part of the periodic CSI reports are common between BWP, a part of the periodic CSI reports are unique among BWP, e.g. RI is common among BWP, i.e. RI obtained by channel and interference measurement of BWP-1 can be used as RI of BWP-2, so as to obtain CQI of BWP-2, optionally, PMI can also be obtained, and CQI/PMI is unique among BWP, i.e. CQI/PMI of each BWP is obtained according to respective BWP.

Another set of periodic CSI reports as described above is a periodic CSI report calculated from channel and interference conditions within the inactive BWP. The periodic CSI report is a periodic CSI report calculated from a portion of BWP with the best channel quality selected from the BWP configured by the UE. The BWP according to which the periodic CSI report is calculated is N (N is a positive integer greater than or equal to 1, where N is a value preset by the UE through receiving a higher layer signaling configuration or protocol) where the channel quality is the best from the configured bwrps, the periodic CSI report includes at least CQI, and may include RI and/or PMI, and the parameters in the CSI report are calculated according to the channel and interference conditions in the N bwrps where the channel quality is the best selected by the UE. For example, the UE configures 4 downlink BWPs, BWP-1, BWP-2, BWP-3, BWP-4, the periodic CSI report is calculated according to the channel and interference situation in the BWP with the best channel quality selected by the UE from BWP-1, BWP-2, BWP-3, BWP-4, and if BWP-2 and BWP-3 are the best BWPs selected by the UE, the periodic CSI report is 2 periodic CSI reports calculated according to the channel and interference situation in BWP-2 and BWP-3.

Embodiment III:

the configuration of the CSI-RS resources according to which the aperiodic CSI report is based is different from that of the existing aperiodic CSI-RS resources, and because the bandwidth capability of the UE is limited, the UE can only receive CSI-RS in one BWP and measure the CSI-RS in one slot, and thus the aperiodic CSI-RS used for the aperiodic CSI report may be one CSI-RS pattern switched in different BWP according to a certain format, that is, when the UE receives one aperiodic CSI-RS driving, the UE may receive CSI-RS in all BWP configured by the UE in several different downlink slots, respectively. For example, the UE configures 4 downlink BWP, BWP-1, BWP-2, BWP-3, BWP-4, respectively, the UE receives the signaling (physical layer signaling (DCI) or Medium Access (MAC) layer signaling) driving the aperiodic CSI-RS at the slot n, the UE receives the CSI-RS at the different BWP in a time-division manner at the subsequent several determined downlink slots, for example, the downlink slot n+k (k is a non-negative integer, for example, k may be equal to 0, and k is configured by high-layer signaling or preset by a protocol) the UE receives the CSI-RS at BWP-1, the downlink slot n+k+1UE receives the CSI-RS at BWP-2, the downlink slot n+k+2UE receives the CSI-RS at BWP-3, and the downlink slot n+k+3 UE receives the CSI-RS at BWP-4, as shown in fig. 8.

The configuration of the CSI-RS resources according to which the aperiodic CSI report is based may be different from that of the existing aperiodic CSI-RS resources, and because the bandwidth capability of the UE is limited, the UE can only receive CSI-RS in one BWP and measure them in one slot, and thus the aperiodic CSI-RS for the aperiodic CSI report may be one CSI-RS pattern switched in different BWP according to a certain format, that is, when the UE receives one aperiodic CSI-RS drive, the UE may receive CSI-RS in a part of BWP designated in the BWP configured by the UE in several different downlink slots, respectively. For example, the UE is configured with 4 downlink BWPs, BWP-1, BWP-2, BWP-3, BWP-4, and the UE receives signaling (physical layer signaling (DCI) or Medium Access (MAC) layer signaling) driving aperiodic CSI-RS at slot n, indicating that the UE receives CSI-RSs within BWP-1 and BWP-3, respectively, then downlink slot n+k UE receives CSI-RSs on BWP-1 and downlink slot n+k+1UE receives CSI-RSs on BWP-3, as shown in FIG. 9.

The CSI-RS resource according to which the aperiodic CSI report is based may also be a periodic CSI-RS resource, and because of limited bandwidth capability of the UE, the UE can only receive CSI-RS in one BWP and measure the CSI in one slot, if one aperiodic CSI report of the UE is to be determined according to channels and interference conditions of multiple BWP, the periodic CSI-RS resource of the UE is to be in multiple slots, so that the UE can measure CSI in different BWP at different times respectively. The aperiodic CSI is reported in time slot n, and the CSI-RS resource of BWP-i is reported in time slot n-k-m _i Wherein k is determined according to the requirement of processing delay, and the processing time between the CSI-RS measurement and the CSI report is set aside, m _i 0 or more and n-k-m _i The slots have CSI-RS resources at BWP-i and at slots n-k-m _i No CSI-RS resources exist at other BWPs. For example, the UE may be configured with 4 downlink BWPs, BWP-1, BWP-2, BWP-3, BWP-4, with aperiodic CSI reported at time slot n and with the CSI-RS resources of BWP-1 at time slot n-k-m ₁ The CSI-RS resource of BWP-2 is in slot n-k-m ₂ The CSI-RS resource of BWP-3 is in slot n-k-m ₃ The CSI-RS resource of BWP-4 is in slot n-k-m ₄ And n-k-m ₁ ，n-k-m ₂ ，n-k-m ₃ ，n-k-m ₄ Are not overlapping with each other as shown in fig. 10. Alternatively, in the same slot, CSI-RS exist in a plurality of BWP, and the UE cannot simultaneously receive CSI-RS in a plurality of BWP in one slot, and thus, when CSI-RS exist in a plurality of BWP in one slot, one priority order is determined to receive CSI-RS in different BWP. For example, the UE is configured with 4 downlink BWP, BWP-1, BWP-2, BWP-3, BWP-4, respectively, to preferentially receive CSI-RS in BWP with the closest aperiodic CSI reporting interval in order of BWP sequence numbers from large to small, and the aperiodic CSI is reported in time slot n, in time slot n-k-m ₁ ，n-k-m ₂ ，n-k-m ₃ ，n-k-m ₄ Has a CSI-RS in BWP-1, BWP-2, BWP-3, BWP-4, and m ₁ <m ₂ <m ₃ <m ₄ Then in time slot n-k-m ₁ Receiving CSI-RS in BWP-4 in time slot n-k-m ₂ Receiving CSI-RS in BWP-3 in time slot n-k-m ₃ Receiving CSI-RS in BWP-2 in time slot n-k-m ₄ CSI-RS within BWP-1 is received as shown in fig. 11.

Embodiment four:

the determination of the CSI-RS resource according to the periodic CSI report may be different from the determination of the existing periodic CSI-RS resource, and because of the limited bandwidth capability of the UE, the UE may only receive and measure CSI-RS in one BWP in one slot.

The method comprises the following steps:

a set of periodic CSI-RS is configured and transmitted only in the activated BWP. For example, if the period of the periodic CSI-RS is T and the time offset is T, the CSI-RS is transmitted at time T, t+t, …, t+nt, …, and at time t+nt, the CSI-RS is transmitted on the BWP activated at that time, and since only one BWP is activated at the same time, the CSI-RS is transmitted on only one BWP at the same time, as shown in fig. 12.

The second method is as follows:

at least two sets of periodic CSI-RS are configured, and one set of CSI-RS is transmitted only in the active BWP and the remaining CSI-RS are transmitted in the active BWP or the inactive BWP. For example, if one set of CSI-RS is configured with a period of the periodic CSI-RS being T and a time offset being T, the CSI-RS is transmitted at time T, t+t, …, t+nt, …, and at time t+nt, the CSI-RS is transmitted on the BWP activated at the time, as shown in fig. 12, the period may be relatively small, so as to accurately measure channel information, thereby transmitting data with a suitable transmission format and improving the throughput of the transmitted data; the other set of CSI-RS is mainly adapted to determine which of the plurality of BWP configured by the UE is the best channel quality, so that according to this situation, the base station activates the appropriate BWP, the set of CSI-RS may be transmitted in a time-division multiplexed manner over the plurality of BWP within a time window, the configured periodicity and time offset being for the CSI-RS window, e.g. the periodicity of the CSI-RS window is configured as T1, the time offset is T2, the duration of the CSI-RS time window is L, within the time window of time T2 to t2+l, …, t2+nt1 to t2+l+nt1, the UE transmits the CSI-RS within the determined plurality of BWP, e.g. the CSI-RS is required to be transmitted over 3 BWP within one time window, the CSI-RS is transmitted over BWP-1 at time T2, the CSI-RS is transmitted over BWP-2+l/2, the CSI-RS is transmitted over time T2+l, and the CSI-RS is transmitted over p-3 as shown in fig. 13.

Fifth embodiment:

when the UE can only receive downlink channels and signals on one BWP at the same time, then the UE cannot detect the control resource set (CORESET, control Resource Set, PDCCH may be transmitted in CORESET-defined resources) and receive PDSCH on the activated BWP when the UE measures on the non-activated BWP, and the period of time the UE measures on the non-activated BWP is called a gap (gap). The following describes a determination method of the UE for measuring the gap of the inactive BWP and how the UE operates in the gap time.

The method comprises the following steps:

the base station configures a set of gaps (or this gap is a time slot or OFDM symbol occupied by CSI-RS configured by the base station on the non-activated BWP by the UE) to the UE through the UE-specific higher layer signaling, for example, the configured gaps are periodic, the period and time offset of the gaps and the time length of the gaps are configured by the higher layer signaling, for example, as shown in fig. 14, the period in which the periodic gaps are configured is T, the time offset is T, and the time length is L, then the gaps start to last for a duration L at time T, t+t, …, t+nt, …, and the units of T, L are configured by the UE-specific higher layer signaling, or are preset by a protocol, for example, the UE receives the UE-specific higher layer signaling configuration T, L in a time slot of 1 ms. In the time slot where the active BWP overlaps with the gap, or the time interval between the two is less than t '(t' is due to the delay of BWP handover), the UE does not detect CORESET and receive PDSCH on the active BWP, as shown in fig. 15.

The second method is as follows:

the base station configures a set of gaps (or this gap is a time slot or OFDM symbol occupied by CSI-RS configured by the base station on the non-activated BWP by the UE) to the UE through the UE-specific higher layer signaling, for example, the configured gaps are periodic, the period and time offset of the gaps and the time length of the gaps are configured by the higher layer signaling, for example, as shown in fig. 14, the period in which the periodic gaps are configured is T, the time offset is T, and the time length is L, then the gaps start to last for a duration L at time T, t+t, …, t+nt, …, and the units of T, L are configured by the UE-specific higher layer signaling, or are preset by a protocol, for example, the UE receives the UE-specific higher layer signaling configuration T, L in a time slot of 1 ms. The UE detects CORESET on active BWP (or the time interval between them is less than t '(t' is the delay due to BWP switching)) which overlaps with gap in active BWP (or the time interval between them is less than t '(t' is the delay due to BWP switching)) as shown in fig. 16, otherwise, the UE detects CORESET on active BWP (or the time interval between them is greater than or equal to t '(t' is the delay due to BWP switching)) which does not overlap with gap (as shown in fig. 17). In this way, the reception of activated BWP is less affected by gap than in method one.

And a third method:

the base station configures a set of gaps (or this gap is a time slot or OFDM symbol occupied by CSI-RS configured by the base station on the non-activated BWP by the UE) to the UE through the UE-specific higher layer signaling, for example, the configured gaps are periodic, the period and time offset of the gaps and the time length of the gaps are configured by the higher layer signaling, for example, as shown in fig. 14, the period in which the periodic gaps are configured is T, the time offset is T, and the time length is L, then the gaps start to last for a duration L at time T, t+t, …, t+nt, …, and the units of T, L are configured by the UE-specific higher layer signaling, or are preset by a protocol, for example, the UE receives the UE-specific higher layer signaling configuration T, L in a time slot of 1 ms. The PDSCH scheduled to overlap with the gap in the activated BWP (or the time interval between the two is less than t '(t' is the delay due to BWP switching)), and the UE does not receive the PDSCH overlapping with the gap (or the time interval between the two is less than t '(t' is the delay due to BWP switching)) on the activated BWP, otherwise the UE receives the PDSCH not overlapping with the gap (or the time interval between the two is greater than or equal to t '(t' is the delay due to BWP switching)) on the activated BWP.

The method four:

the base station configures a set of gaps (or this gap is a time slot or OFDM symbol occupied by CSI-RS configured by the base station on the non-activated BWP by the UE) to the UE through the UE-specific higher layer signaling, for example, the configured gaps are periodic, the period and time offset of the gaps and the time length of the gaps are configured by the higher layer signaling, for example, as shown in fig. 14, the period in which the periodic gaps are configured is T, the time offset is T, and the time length is L, then the gaps start to last for a duration L at time T, t+t, …, t+nt, …, and the units of T, L are configured by the UE-specific higher layer signaling, or are preset by a protocol, for example, the UE receives the UE-specific higher layer signaling configuration T, L in a time slot of 1 ms. If the PDSCH scheduled in the active BWP overlaps with the gap (or the time interval between the two is less than t '(t' is the delay due to BWP switching)), the UE receives the PDSCH overlapping with the gap (or the time interval between the two is less than t '(t' is the delay due to BWP switching)) on the active BWP without measuring on the inactive BWP, the base station may not schedule the PDSCH if the base station wants the UE to measure the inactive BWP in the gap, and schedule the PDSCH if the base station does not want the UE to measure the inactive BWP in the gap, so that the base station has greater flexibility; if there is no overlapping PDSCH scheduled with the gap in the active BWP (or the time interval between the two is less than t '(t' is due to the delay of BWP handover)), the UE measures the inactive BWP within the gap.

Corresponding to the above method, the present application also provides an apparatus for reporting CSI, whose basic composition structure is shown in fig. 18, including:

The foregoing description of the preferred embodiments of the application is not intended to be limiting, but rather to enable any modification, equivalent replacement, improvement or the like to be made within the spirit and principles of the application.

Claims

1. A method performed by a user equipment, UE, in a communication system, comprising:

the UE selects at least one BWP from the configured bandwidth part BWP;

the UE calculates a Channel State Information (CSI) report according to the selected BWP;

the UE sends a CSI report to the base station,

wherein, in case that the CSI report is an aperiodic CSI report and only one aperiodic CSI report calculated according to channel and interference conditions within one BWP is included in one aperiodic CSI report, the UE selecting at least one BWP from the configured BWPs includes:

2. The method according to claim 1, characterized in that:

the method further comprises the steps of: and the UE determines a channel state information reference signal (CSI-RS) resource according to the aperiodic CSI report and receives a corresponding CSI-RS.

3. The method of claim 2, wherein the UE receiving the corresponding CSI-RS comprises one of:

UE receives CSI-RS resources of a periodical CSI report;

4. A method performed by a user equipment, UE, in a communication system, comprising:

the UE selects at least one BWP from the configured bandwidth part BWP;

the UE calculates a CSI report according to the selected BWP;

the UE sends a CSI report to the base station,

wherein, in case the CSI report is an aperiodic CSI report and at least two aperiodic CSI reports calculated according to channel and interference conditions within at least two BWPs are included in one aperiodic CSI report, the UE selects at least one BWP from the configured BWPs including one of:

5. The method according to claim 4, wherein:

6. The method of claim 5, wherein the UE receiving the corresponding CSI-RS comprises one of:

UE receives CSI-RS resources of a periodical CSI report;

7. A method performed by a user equipment, UE, in a communication system, comprising:

the UE selects at least one BWP from the configured bandwidth part BWP;

the UE calculates a CSI report according to the selected BWP;

the UE sends a CSI report to the base station,

wherein, in the case that the CSI report is a periodic CSI report and only one set of periodic CSI report reports is configured, and only the periodic CSI report calculated according to the channel and interference conditions in the activated BWP is included in one periodic CSI report, the UE selecting at least one BWP from the configured BWPs includes: the UE selects an active BWP from the configured BWP.

8. The method according to claim 7, wherein:

the method further comprises the steps of: and the UE determines the CSI-RS resource according to the set of periodic CSI reports and receives the corresponding CSI-RS.

9. The method of claim 8, wherein the UE receiving the corresponding CSI-RS comprises:

10. A method performed by a user equipment, UE, in a communication system, comprising:

the UE selects at least one BWP from the configured bandwidth part BWP;

the UE calculates a CSI report according to the selected BWP;

the UE sends a CSI report to the base station,

wherein, in case the CSI report is a periodic CSI report and at least two sets of periodic CSI report reports are configured, one set of periodic CSI reports is calculated according to the channel and interference conditions in the activated BWP in the configured BWP, and the rest of periodic CSI reports are calculated according to the channel and interference conditions in at least one inactive BWP in the configured BWP or according to the channel and interference conditions in all BWP.

11. The method according to claim 10, wherein:

the method further comprises the steps of: and the UE determines the CSI-RS resources according to the at least two sets of periodic CSI reports and receives corresponding CSI-RSs.

12. The method of claim 11, wherein the UE receiving the corresponding CSI-RS comprises:

13. A user equipment, comprising:

a memory configured to store a computer program; and

a processor configured to run the computer program to implement the method of any one of claims 1-12.