CN115765807A

CN115765807A - Communication method, terminal device and network device

Info

Publication number: CN115765807A
Application number: CN202211363203.8A
Authority: CN
Inventors: 熊芳
Original assignee: Zeku Technology Beijing Corp Ltd
Current assignee: Zeku Technology Beijing Corp Ltd
Priority date: 2022-11-02
Filing date: 2022-11-02
Publication date: 2023-03-07

Abstract

The application discloses a communication method, a terminal device and a network device, which are applied to the terminal device, wherein the method comprises the following steps: determining a reporting value of a first-stage codebook of a precoding matrix according to a broadband mutual information value corresponding to the precoding matrix; determining pre-coding type indication information according to the reported value of the first-stage codebook; and reporting the pre-coding type indication information to network equipment. In the embodiment of the application, the reporting value of the first-level codebook is determined based on the broadband mutual information value, so that the robustness of PTI reporting is improved.

Description

Communication method, terminal device and network device

Technical Field

The present invention relates to the field of wireless communication technologies, and in particular, to a communication method, a terminal device, and a network device.

Background

In a Long Term Evolution (LTE) system, a two-stage codebook structure W = W is introduced for Massive MIMO technology ₁ ·W ₂ Wherein W is ₁ The first-stage codebook represents the channel correlation in the same polarization direction and describes the long-term broadband statistical characteristics of the channel; w ₂ The second-stage codebook represents the channel correlation among different polarization directions at the same physical position, and describes channel short-term sub-band information, namely sub-band feedback.

A channel state information reference signal (CSI-RS) is a type of reference signal used for measuring a downlink channel. The terminal device may perform downlink channel measurement based on the CSI-RS sent by the network device to obtain Channel State Information (CSI) of the downlink channel, and report the CSI to the network device, and the network device schedules the downlink resource according to the CSI. Among them, the CSI may include Precoding Matrix Indicator (PMI) information, precoding Type Indicator (PTI) information, rank Indicator (RI) information, channel Quality Indicator (CQI) information, and the like.

The PTI is reporting indication information introduced in TM9 in a Physical Uplink Control Channel (PUCCH) mode2-1 periodic reporting mode in an LTE system. In the process of reporting the PTI, the PTI is set to be 0 in the first reporting process, and the broadband reporting is started. If the first-level codebook is not changed in one PTI reporting period, the terminal device sets the PTI to be 1 at the next PTI reporting time and starts to report the sub-band. Once the first-level codebook is found to be changed, the PTI is set to 0 at the moment of reporting the PTI. If the PTI is directly switched only through the change of the first-stage codebook, extreme conditions such as very frequent PTI switching or no PTI switching are easily caused, and resource scheduling of the network equipment is not facilitated.

Disclosure of Invention

The embodiment of the application provides a communication method, terminal equipment and network equipment. Various aspects of embodiments of the present application are described below.

In a first aspect, a communication method is provided, which is applied to a terminal device, and the method includes: determining a reported value of a first-stage codebook of a pre-coding matrix according to a broadband mutual information value corresponding to the pre-coding matrix; determining pre-coding type indication information according to the reported value of the first-stage codebook; and reporting the pre-coding type indication information to network equipment.

In a second aspect, a communication method is provided, which is applied to a network device, and the method includes: receiving pre-coding type indication information reported by terminal equipment; the pre-coding type indication information is determined according to a reported value of a first-stage codebook of a pre-coding matrix, and the reported value of the first-stage codebook is determined according to a broadband mutual information value corresponding to the pre-coding matrix.

In a third aspect, a terminal device is provided, which includes a processing unit and a communication unit, where the processing unit is configured to: determining a reported value of a first-stage codebook of a pre-coding matrix according to a broadband mutual information value corresponding to the pre-coding matrix; determining pre-coding type indication information according to the reported value of the first-stage codebook; and reporting the pre-coding type indication information to network equipment through the communication unit.

A fourth aspect provides a network device, including a processing unit and a communication unit, where the processing unit receives, through the communication unit, precoding type indication information reported by a terminal device; the pre-coding type indication information is determined according to a reported value of a first-stage codebook of a pre-coding matrix, and the reported value of the first-stage codebook is determined according to a broadband mutual information value corresponding to the pre-coding matrix.

In a fifth aspect, there is provided a computer readable storage medium having stored thereon executable code which, when executed, is capable of implementing a method as described in the first or second aspect.

The embodiment of the application provides a communication method, in the reporting process of precoding type indication information PTI, the reporting value of a first-level codebook of a precoding matrix is determined according to a broadband mutual information value corresponding to the precoding matrix, and then the precoding type indication information PTI is determined. The reporting value of the first-level codebook is determined based on the broadband mutual information value, so that the terminal equipment is facilitated to reasonably report the PTI value, and the robustness of PTI reporting is improved.

Drawings

Fig. 1 is a schematic structural diagram of an application scenario according to an embodiment of the present application.

Fig. 2 is a flowchart illustrating a communication method according to an embodiment of the present application.

Fig. 3 is a schematic flow chart of mode2-1 reporting according to an embodiment of the present application.

Fig. 4 is a schematic structural diagram of a terminal device according to an embodiment of the present application.

Fig. 5 is a schematic structural diagram of a network device according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments.

The technical scheme of the embodiment of the application can be applied to various communication systems, for example: a global system for mobile communication (GSM) system, a Code Division Multiple Access (CDMA) system, a Wideband Code Division Multiple Access (WCDMA) system, a General Packet Radio Service (GPRS), a long term evolution (long term evolution, LTE) system, a LTE Frequency Division Duplex (FDD) system, a LTE Time Division Duplex (TDD) system, a universal mobile telecommunications system (universal mobile telecommunications system, UMTS), a Worldwide Interoperability for Microwave Access (WiMAX) communication system, a fifth generation (generation, etc., a wireless radio (NR), etc. The technical scheme provided by the application can also be applied to future communication systems, such as a sixth generation mobile communication system, a satellite communication system and the like.

The terminal device in this embodiment may also be referred to as a User Equipment (UE), an access terminal, a subscriber unit, a subscriber station, a Mobile Station (MS), a Mobile Terminal (MT), a remote station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, or a user equipment. The terminal device in the embodiment of the present application may be a device providing voice and/or data connectivity to a user, and may be used for connecting people, things, and machines, such as a handheld device with a wireless connection function, a vehicle-mounted device, and the like. The terminal device in the embodiment of the present application may be a mobile phone (mobile phone), a tablet computer (Pad), a notebook computer, a palmtop computer, a Mobile Internet Device (MID), a wearable device, a Virtual Reality (VR) device, an Augmented Reality (AR) device, a wireless terminal in industrial control (industrial control), a wireless terminal in self driving (self driving), a wireless terminal in remote surgery (remote medical supply), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation safety (transportation safety), a wireless terminal in smart city (smart city), a wireless terminal in smart home (smart home), and the like. Alternatively, the UE may be configured to act as a base station. For example, the UE may act as a scheduling entity that provides sidelink signals between UEs in V2X or D2D, etc. For example, cellular telephones and automobiles communicate with each other using sidelink signals. The communication between the cellular phone and the smart home device is performed without relaying communication signals through a base station.

The network device in the embodiments of the present application may be a device for communicating with a terminal device, and the network device may also be referred to as an access network device or a radio access network device, for example, the network device may be a base station. The network device in this embodiment may refer to a Radio Access Network (RAN) node (or device) that accesses a terminal device to a wireless network. The base station may broadly cover or replace various names such as: node B (NodeB), evolved node B (eNB), next generation base station (next generation NodeB, gNB), relay station, access point, transmission point (TRP), transmission Point (TP), master station MeNB, secondary station SeNB, multi-mode wireless (MSR) node, home base station, network controller, access node, wireless node, access Point (AP), transmission node, transceiving node, baseband Unit (BBU), remote Radio Unit (RRU), active Antenna Unit (AAU), radio head (RRH), central Unit (central Unit, CU), distributed Unit (DU), positioning node, and the like. The base station may be a macro base station, a micro base station, a relay node, a donor node, or the like, or a combination thereof. A base station may also refer to a communication module, modem, or chip for locating within the aforementioned apparatus or devices. The base station may also be a mobile switching center, a device-to-device D2D, a vehicle-to-outside (V2X), a device that bears a base station function in machine-to-machine (M2M) communication, a network side device in a 6G network, a device that bears a base station function in a future communication system, and the like. The base stations may support networks of the same or different access technologies. The embodiments of the present application do not limit the specific technologies and the specific device forms used by the network devices.

The base stations may be fixed or mobile. For example, a helicopter or drone may be configured to act as a mobile base station, and one or more cells may move according to the location of the mobile base station. In other examples, a helicopter or drone may be configured to function as a device to communicate with another base station.

In some deployments, the network device in the embodiments of the present application may refer to a CU or a DU, or the network device includes a CU and a DU. The gNB may also include AAU.

The network equipment and the terminal equipment can be deployed on land, including indoor or outdoor, handheld or vehicle-mounted; can also be deployed on the water surface; it may also be deployed on airborne airplanes, balloons, and satellites. In the embodiment of the present application, the scenes where the network device and the terminal device are located are not limited.

It should be understood that all or part of the functions of the blind detection device in the present application may also be implemented by software functions running on hardware, or by virtualization functions instantiated on a platform (e.g., a cloud platform).

Fig. 1 is a schematic diagram of a communication scenario according to an embodiment of the present application. As shown in fig. 1, the application scenario includes a terminal device 120 and a network device 110, where the network device 110 may be an access network device, such as a base station. The network device 110 and the terminal device 120 establish connection by wireless signals. After the connection is established, the terminal device 120 may perform downlink channel measurement based on the CSI-RS sent by the network device 110 to obtain the CSI of the downlink channel, and report the CSI to the network device 110, and the network device schedules the downlink resource according to the CSI. Wherein, the CSI may include, for example, PMI, PTI, RI, CQI, and the like.

With the development of communication technology, a Massive MIMO (Massive MIMO) technology is one of the key technologies of wireless communication technology. By adopting the Massive MIMO technology, the frequency spectrum efficiency can be obviously increased, and particularly when the capacity requirement is large or the coverage range is wide, the Massive MIMO technology can meet the network growth requirement and can reduce the interference.

Aiming at Massive MIMO technology, considering subsequent expandability, flexibility and workload of codebook design, in an LTE system, a two-stage codebook structure W = W is adopted ₁ ·W ₂ . Wherein, W ₁ The first-stage codebook represents the channel correlation in the same polarization direction and describes the long-term broadband statistical characteristic of the channel; w ₂ The second-stage codebook represents the channel correlation among different polarization directions at the same physical position, and describes channel short-term sub-band information, namely sub-band feedback.

In some embodiments, the first-level codebook in the two-level codebook is generally denoted by "i1" and the second-level codebook in the two-level codebook is denoted by "i 2". The first-stage codebook is CSI feedback with conventional precision and can be used for single-user multiple-input multiple-output (SU-MIMO) transmission, and the second-stage codebook is CSI feedback with high precision and can be used for multi-user multiple-input multiple-output (MU-MIMO) transmission.

It can be understood that PTI is one piece of reporting indication information introduced under a TM9 port in a Physical Uplink Control Channel (PUCCH) mode2-1 periodic reporting mode in LTE. The PUCCH reporting Mode2-1 of the TM9 port can refer to table 1 below, and a feedback period description for this Mode in the protocol is given.

It can be seen that, the terminal device reports RI + PTI, and when PTI =0 and Type2a is reported, the reported content is Wideband first PMI, which may also be referred to as first-stage codebook Wideband i1; when PTI =0 and the Type2b is reported, reporting the wideband second PMI + wideband CQI, wherein the wideband second PMI can also be called a second-level codebook wideband i2; when PTI =1 and the Type2b is reported, reporting the content as wideband second PMI + wideband CQI; when the PTI =1 and the Type1a is reported, the reported content is subband second-level codebook subbase PMI + subbase CQI, where the subbase second-level codebook subbase PMI may also be referred to as subband second-level codebook subbase i2.

As can be seen from the reported content, when PTI =0, the terminal only reports wideband codebook information and wideband CQI value. When PTI =1, the terminal device reports the information of the wideband i2, and the subband i2 and the subband CQI information. Therefore, the terminal device reports the PTI value according to the channel environment of the terminal device, and the network device knows the content fed back by the terminal device at the subsequent corresponding time after receiving the RI and the PTI reports, thereby assisting the base station to perform better scheduling processing.

TABLE 1

It should be noted that the meaning of the parameters in table 1 can be referred to 7.2.2 of 3GPP protocol 36211.

It can be understood that, when the terminal device reports the PTI for the first time, the PTI is set to 0, and the broadband reporting is started. In the related art, if it is found that the first-level codebook has not changed all the time in one PTI reporting period, the terminal device may set the PTI to 1 at the next PTI reporting time, and start reporting the subband. And once the first-stage codebook is found to be changed, setting the PTI to be 0 at the moment of reporting the PTI. If the PTI is directly switched only through the change of the first-stage codebook, extreme conditions such as very frequent PTI switching or no PTI switching are easily caused, and the resource scheduling precision of the network equipment is reduced. As an example, if there is a change of the first-level codebook in each PTI period, the terminal device always reports PTI =0, and thus, the network device can only receive wideband codebook information and wideband CQI values, and cannot perform finer scheduling according to subband information, which reduces resource scheduling accuracy of the network device.

In view of the above problems, it is found through research that when the first-stage codebook changes, the change of the first-stage codebook may not have a great influence on the channel performance, and at this time, it can be considered that the first-stage codebook does not change, so that the change frequency of the first-stage codebook can be reduced, and thus the terminal device can report the PTI value more reasonably.

The embodiment of the application provides a communication method, in the reporting process of precoding type indication information PTI, the reporting value of a first-level codebook of a precoding matrix is determined according to a broadband mutual information value corresponding to the precoding matrix, and then the precoding type indication information PTI is determined. The reporting value of the first-level codebook is determined based on the broadband mutual information value, so that the terminal equipment is facilitated to reasonably report the PTI value, the robustness of PTI reporting is improved, and the resource scheduling precision of the network equipment is improved.

The communication method in the embodiment of the present application is described in detail below with reference to fig. 2. The method shown in fig. 2 can be applied to terminal devices and also to network devices. It should be understood that the terminal device and the network device shown in fig. 2 may be any of the types of terminal devices and network devices, respectively, mentioned previously. The method shown in fig. 2 includes steps S220 to S260.

In step S220, the reported value of the first-level codebook of the precoding matrix is determined according to the wideband mutual information value corresponding to the precoding matrix.

In some embodiments, the wideband mutual information value corresponding to the precoding matrix may reflect a channel performance of a channel environment in which the terminal device itself is located, where the channel performance may be, for example, a demodulation and decoding capability of a signal.

In some embodiments, the wideband mutual information value corresponding to the precoding matrix may be calculated and determined according to the current measurement value of the first-stage codebook, and then the reported value of the first-stage codebook may be determined in turn according to the wideband mutual information value.

As an example, the wideband mutual information value corresponding to the determined coding matrix may be calculated according to the current measurement value of the first-level codebook, and is denoted as a first wideband mutual information value. Then, the wideband mutual information value corresponding to the determined coding matrix can be calculated according to the historical reported value of the first-level codebook, and is recorded as a second bandwidth mutual information value. Then comparing the difference value between the first broadband mutual information value and the second broadband mutual information value with a first preset threshold value, wherein if the difference value between the first broadband mutual information value and the second broadband mutual information value is larger than the first preset threshold value, the reported value of the first-stage codebook can be the current measured value of the first-stage codebook; if the difference value between the first wideband mutual information value and the second wideband mutual information value is less than or equal to a first preset threshold value, the reported value of the first-stage codebook may be a historical reported value of the first-stage codebook.

It should be noted that the first preset threshold may be used to represent a maximum allowable difference between the first wideband mutual information value and the second wideband mutual information value. The first preset threshold may be an empirical value, or may be obtained through an experiment or simulation, which is not specifically limited in the embodiment of the present application.

It should be noted that the historical reported value of the first-stage codebook may refer to a reported value of the first-stage codebook at the last time (that is, the last time), so that although the current measured value of the first-stage codebook is different from the historical reported value, if the influence on the channel performance is within an acceptable range, the current measured value of the first-stage codebook may be assigned as the historical reported value and reported, thereby reducing the change frequency of the first-stage codebook and improving the robustness of the PTI feedback.

In step S240, precoding type indication information is determined according to the reported value of the first-level codebook.

In some embodiments, after the reported value of the first-level codebook is determined, the precoding type indicator information PTI may be determined according to the reported value of the first-level codebook, and more specifically, the precoding type indicator information may be determined by determining whether the reported value of the first-level codebook changes in a PTI reporting period.

As an example, if the reporting value of the first-level codebook changes within the PTI reporting period, the PTI may be set to 0 at the reporting time of the PTI; if the reporting value of the first-level codebook does not change in the PTI reporting period, the PTI may be set to 1 at the reporting time of the PTI.

In some embodiments, the change frequency of the reported value of the first-level codebook may also be obtained in the reporting period of the precoding type indication information, and then the precoding type indication information may be determined according to the change frequency of the reported value of the first-level codebook.

As an example, if the change frequency of the reported value of the first-level codebook is less than or equal to a second preset threshold, the precoding type indication information may be set to 1; if the change frequency of the reported value of the first-stage codebook is greater than a second preset threshold, the precoding type indication information may be set to 0. It should be appreciated that a second predetermined threshold value may be used to represent the maximum acceptable change frequency value for the reported values of the first-stage codebook. The second preset threshold may be an empirical value, or may be obtained through an experiment or simulation, which is not specifically limited in the embodiment of the present application.

Further, for example, if the second preset threshold is 1, the reporting period of one precoding type indicator includes 10 reporting periods of the first-level codebook. Under the condition, if the reporting value of the first-level codebook changes 1 time in the reporting period of the pre-coding type indication information, that is, the change frequency is 1, it can be considered that the influence of the change of the reporting value of the first codebook on the channel performance is small in the reporting period of the pre-coding type indication information, and the pre-coding type indication information can be set to 1; if the change frequency of the reported value of the first-stage codebook is greater than 1 in the reporting period of the pre-coding type indication information, the pre-coding type indication information can be set to 0.

In some examples, the method for determining precoding type indication information may further include: acquiring a frequency domain coherent bandwidth value of a channel; and then, determining precoding type indication information according to the change frequency of the reported value of the first-stage codebook and the frequency domain coherence bandwidth value of the channel.

As an example, if the change frequency of the reported value of the first-stage codebook is less than or equal to the second preset threshold, the frequency domain coherence bandwidth value of the channel may be continuously determined.

Further, for example, if the change frequency of the reported value of the first-stage codebook is less than or equal to the second preset threshold, it indicates that the change of the first-stage codebook is acceptable, at this time, the frequency domain coherent bandwidth value may be continuously determined, and if the frequency domain coherent bandwidth value of the channel is less than the third preset threshold, it is considered that the current frequency selection characteristic is relatively small, the network device needs to perform more fine resource scheduling according to the sub-band information, at this time, the precoding type indication information may be set to 1; if the frequency domain coherent bandwidth value of the channel is greater than or equal to the third preset threshold, the current frequency selection characteristic is considered to be relatively large, and the network device can perform relatively accurate resource scheduling according to the broadband information, at this time, although the change of the first-stage codebook can be received, the report can be performed according to the actual measurement value of the first-stage codebook, that is, the first-stage codebook is changed, and the PTI can be set to 0, so that the robustness of the PTI measurement report can be improved.

It should be noted that the third preset threshold may be used to indicate the size of the sub-band.

It should be noted that, if the change frequency of the reported value of the first-stage codebook is greater than the second preset threshold, the precoding type indication information is set to 0.

In step S260, the precoding type indication information is reported to the network device.

At the reporting time of the precoding type indication information, the precoding type indication information may be reported to the network device.

In some embodiments, the reporting time of the precoding Type indicator information may be calculated according to the reporting time formula of Type6 in table 1.

In some examples, the method for determining precoding type indication information may further include: and acquiring the rank indication information of the channel, and determining the precoding type indication information according to the rank indication information of the channel.

The rank indication information may be used to indicate an optimal number of layers for downlink input transmission to the terminal device, and further, the channel quality indication CQI may be used to indicate a highest Modulation and Coding Scheme (MCS) that can be used to ensure that the bit error rate of downlink data reception does not exceed 10% when the proposed RI and PMI are used. Therefore, if the rank indication information is changed, the PTI may be directly switched to 0. If the rank indication information is not changed, the precoding type indication information PTI may be determined in the above-mentioned manner.

To further understand the mode2-1 reporting process, the following example is provided with reference to fig. 3.

In the embodiment of the present application, it can be assumed that the reporting condition of mode2-1 is as follows: n is a radical of hydrogen _pd =5ms, j =4, k =1, h' =2, h = j + k +1, mri =2; reporting period NP2=2N of Type2a _pd Type2b/PTI =0 reporting period NP3_0=N _pd Type2b/PTI =1 reporting period NP3_1=5n _pd Type1a report period NP4= N _pd Type6 report cycle NP1=10N _pd 。

Under the above conditions, a mode2-1 reporting schematic diagram in a period of time can be obtained, as shown in fig. 3, it can be seen that, at the nth reporting time of PTI, the terminal device reports RI + PTI =0, and then, starting the report of the wideband, and when the terminal device reports the PTI =0 at the corresponding time, reporting the contents of Type2a and Type2b, that is, reporting the wideband codebook information and the wideband CQI value. The wideband codebook information includes wideband first-level and second-level codebooks. The method comprises the steps that terminal equipment reports RI + PTI =1 at the N +1 reporting time and the N +2 reporting time of PTI, then reporting of broadband and sub-band information is started, and when the terminal equipment reports PTI =1 at corresponding time, the terminal equipment reports the contents of Type2b and Type1a, namely reports sub-band second-level codebook information and sub-broadband CQI value at the reporting time of Type1 a; and reporting the wideband second-stage codebook information and the wideband CQI value at the reporting time of the Type2 b.

It should be noted that, according to the reporting time formulas corresponding to Type2a, type2b, and Type1a in table 1, the reporting times corresponding to Type2a, type2b, and Type1a can be calculated. When the PTI =0, if the reporting time of the Type2a and the reporting time of the Type2b both meet the requirements, reporting the reporting content corresponding to the Type2 a. When the PTI =1, if the reporting time of the Type1a and the reporting time of the Type2b both meet the requirements, reporting the corresponding reporting content of the Type2 b.

To further understand the mode2-1 reporting procedure, the following describes the mode2-1 reporting procedure in detail. The mode2-1 reporting flow mainly comprises a flow from PTI =0 to PTI =1 and a flow from PTI =1 to PTI =0.

Procedure from PTI =0 to PTI =1

(1) When RI + PTI is reported for the first time, according to the protocol, PTI =0 is reported for the first time, and then corresponding broadband reporting is performed in the following. If the PTI =0 when the RI + PTI reported last time is reported, multiple wideband PMI i1 reports and wideband PMI i2 and wideband CQI reports are performed before the RI + PTI reports next time. For convenience of description, the wideband PMI i1 may be expressed as

wideband PMI i2 is expressed as

RI + PTI reporting period and

the reporting periods are denoted as NP1 and NP2, respectively. Can obtain the information contained in the RI + PTI reporting period

Reporting the periodicity:

wherein, H, M _RI ，N _pd The meaning of H' can be referred to in 7.2.2 of 3GPP protocol 36211.

(2) Based on the CSI-RS reference resource, the terminal device may learn a delay spread (delay spread) and a doppler spread (doppler spread). Further, the corresponding frequency domain coherent bandwidth B can be calculated _F And a time domain correlation value T _P . To facilitate observation

The embodiment of the present application can be configured as follows

Observation period M of _pd ，M _pd Is integral multiple of RI + PTI reporting period, and the time domain observed value is T _P M of (A) _p Multiple, M _p Can be configured.

M _pd ＝M _p *T _p ；M _pd ＝max(ceil(M _p *T _p /NP 1)，1)*NP1

(3) When the wideband i1 reports, the terminal equipment can calculate and process the current optimal PMI value through an internal algorithm

And corresponding mutual information value

Simultaneously calculating the i1 reported value reported last time (last time) and the corresponding mutual information value

And then comparing and judging the difference value of the two mutual information values with a first preset threshold value to determine whether the reported value of i1 changes relative to the last reported value at this time.

It should be noted that, in the following description,

and

the PMI value and the mutual information MI value of the n-th-time wideband i1 under the report RI = RI are respectively represented.

For example, taking the mode2-1 report in fig. 3 as an example, suppose there are 5 reports of wideband i1 between two RI measurement reports. The reporting process of the wideband i1 comprises the following steps:

step 1: when reporting the wideband i1 for the first time, recording the measurement

And reporting.

Step 2: when reporting the wideband i1 for the second time, recording the measurement

If it is not

Current measured value of and

if the reported values are different, the terminal device will calculate the sum under the current channel

The current measured value of (2) corresponds to the mutual information value

At the same time, calculate

Mutual information value corresponding to reported value

If it is not

Description of the preferred embodiment

The variation has no major impact on the broadband performance and therefore

The reported value of (2) is not changed, i.e.

If it is not

The beam change has larger influence on the performance, and the beam change is directly reported

The measured value of (2) is sufficient.

It should be understood that if

And historical value

And if the values are the same, directly reporting the values. Thmi is a first preset value, which is a difference threshold value of MI smoothing, and is obtained through simulation.

And step 3: by analogy, the widebandi1 reports from the third to the fifth time can be performed until the next RI report comes, and all reports in the period are recorded

Has a variation frequency (corresponding to the number of variations) of i1Num _Change And the reporting times are 11Num.

In some embodiments, when the RI + PTI is not reported for the first time, if the RI reported value currently changes from the RI reported value in history, the PTI is reported to be 0, the wideband I1 needs to be reported again, and I1Num _Change Reset to 0. If the current reporting value of the RI is consistent with the historical RI reporting value, the operation can be continued according to the step 3, and all reports are continuously recorded

Updating the I1Num _Change And I1Num, until the next RI + PTI reporting time comes.

If it is not

If the change of the i1 is not acceptable, setting the PTI to be 0 and reporting; if it is not

Indicating that a change in i1 can be received, then PTI can be set to 1 directly. In some embodiments, B may also be combined _F Further determination is made, for example, the frequency domain coherence bandwidth B _F Comparing with sub-band size subbbandsize, if B is _F If the current frequency selection characteristic is smaller than subbaseband, the network device needs to perform finer resource scheduling according to the subband information, and at this time, the PTI =1 may be reported. If B is present _F And if the current frequency selection characteristic is larger than or equal to subbaseband, the network equipment can perform more accurate resource scheduling according to the broadband information, and at this time, although the change of i1 can be received, the change of i1 can be reported according to the actual measurement value of i1, that is, the change of i1 occurs, and the PTI can be set to 0.

It is to be understood that P _Change，1 And the threshold is an i1 change rate threshold.

Procedure from PTI =1 to PTI =0

After RI + PTI =1 is reported, wideband i2 and subband i2+ subband CQI continue to be reported. At the moment of reporting RI + PTI next time, if RI changes, PTI is directly switched to 0; if the RI reported values are the same, the RI can be calculated according to the steps 1 to 2 above

And history

Corresponding mutual information value

And

if it is not

Then PTI =1, otherwise PTI =0 is reported.

As can be seen from the above description, in the embodiment of the present application, first, by calculating the wideband MI values of each codebook in the multiple wideband i1 reporting processes, the difference between the wideband MI values under different i1 is determined, and the difference is used as a condition whether the PTI is switched from 0 to 1; secondly, the variation frequency of i1 is considered, and further, the frequency domain correlation bandwidth is also considered as one of the conditional decisions whether the PTI is switched or not. Compared with the traditional scheme of switching the PTI as long as i1 is changed, the scheme can effectively improve the robustness of PTI reporting and is beneficial to resource scheduling of network equipment.

The communication method embodiment of the present application is described in detail above with reference to fig. 1 to 3, and the device embodiment of the present application is described in detail below with reference to fig. 4 and 5. It is to be understood that the description of the method embodiments corresponds to the description of the apparatus embodiments, and therefore reference may be made to the preceding method embodiments for parts not described in detail.

An embodiment of the application provides a schematic structural diagram of a terminal device. As shown in fig. 4, the dashed lines in fig. 4 indicate that the unit or module is optional. The terminal device 400 includes a processing unit 410 and a communication unit 420.

The processing unit 410 may be configured to: determining a reported value of a first-stage codebook of a pre-coding matrix according to a broadband mutual information value corresponding to the pre-coding matrix; determining pre-coding type indication information according to the reported value of the first-stage codebook; and reporting the pre-coding type indication information to 420 network equipment through the communication unit.

The processing unit 410 may be a processor or a controller, such as a Central Processing Unit (CPU), a general-purpose processor, a Digital Signal Processor (DSP), an application-specific integrated circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. The processor may also be a combination of computing functions, e.g., comprising one or more microprocessors, DSPs, and microprocessors, among others. The communication unit 420 may be a transceiver, a transceiving circuit, a radio frequency chip, and the like. The storage unit 530 may be a memory for storing program codes and data of the terminal apparatus 400. .

When the processing unit 410 is a processor, the communication unit 420 is a communication interface, and the storage unit 430 is a memory, the communication device according to the embodiment of the present application may be the terminal device shown in fig. 2.

An embodiment of the present application provides a schematic structural diagram of a network device. As shown in fig. 5, the dashed lines in fig. 5 indicate that the unit or module is optional. The network device 500 includes: a processing unit 510 and a communication unit 520.

The processing unit 510 receives the indication information of the precoding type reported by the terminal device through the communication unit 520; the pre-coding type indication information is determined according to a reported value of a first-stage codebook of a pre-coding matrix, and the reported value of the first-stage codebook is determined according to a broadband mutual information value corresponding to the pre-coding matrix.

The processing unit 510 is used for controlling and managing the actions of the network device 500, the communication unit 520 is used for supporting the communication between the network device and other devices, and the storage unit 530 is used for storing program codes and data of the communication device. It should be noted that the processing unit 510, the communication unit 520 and the storage unit 530 are used for supporting the execution of the steps executed by the above method, and will not be described here.

The processing unit 510 may be a processor or a controller, such as a central processing unit CPU, a general purpose processor, a digital signal processor DSP, an application specific integrated circuit ASIC, a field programmable gate array FPGA or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. The processor may also be a combination of computing functions, e.g., comprising one or more microprocessors, DSPs, and microprocessors, and the like. The communication unit 520 may be a transceiver, a transceiving circuit, a radio frequency chip, and the like. The storage unit 530 may be a memory for storing program codes and data of the network device 500.

When the processing unit 510 is a processor, the communication unit 520 is a communication interface, and the storage unit 530 is a memory, the communication device according to the embodiment of the present application may be a network device shown in fig. 2.

An embodiment of the present application further provides a machine-readable storage medium for storing the program. And the program causes the computer to execute the method in the embodiments of the present application.

The embodiment of the application also provides a computer program product. The computer program product includes a program. The program causes a computer to execute the method in the embodiments of the present application.

In the above embodiments, all or part of the implementation may be realized by software, hardware, firmware or any other combination. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. The procedures or functions described in accordance with the embodiments of the disclosure are, in whole or in part, generated when the computer program instructions are loaded and executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored on a machine-readable storage medium or transmitted from one machine-readable storage medium to another, for example, from one website, computer, server, or data center to another website, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, digital Subscriber Line (DSL)), or wireless (e.g., infrared, wireless, microwave, etc.). The machine-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., digital Video Disk (DVD)), or a semiconductor medium (e.g., solid State Disk (SSD)), among others.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present disclosure.

In the several embodiments provided in the present disclosure, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present disclosure may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The above description is only for the specific embodiments of the present disclosure, but the scope of the present disclosure is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present disclosure, and all the changes or substitutions should be covered within the scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims

1. A communication method is applied to a terminal device, and the method comprises the following steps:

determining a reported value of a first-stage codebook of a pre-coding matrix according to a broadband mutual information value corresponding to the pre-coding matrix;

determining pre-coding type indication information according to the reported value of the first-stage codebook;

and reporting the pre-coding type indication information to network equipment.

2. The communication method according to claim 1, wherein the determining the reported value of the first-level codebook of the precoding matrix according to the wideband mutual information value corresponding to the precoding matrix comprises:

determining a first broadband mutual information value corresponding to the precoding matrix according to the current measurement value of the first-stage codebook;

determining a second broadband mutual information value corresponding to the precoding matrix according to the historical reported value of the first-stage codebook;

if the difference value between the first wideband mutual information value and the second wideband mutual information value is smaller than or equal to a first preset threshold value, the reported value of the first-stage codebook is the historical reported value of the first-stage codebook;

and if the difference value between the first wideband mutual information value and the second wideband mutual information value is greater than the first preset threshold value, the reported value of the first-stage codebook is the current measured value of the first-stage codebook.

3. The communication method of claim 1, wherein the determining precoding type indication information according to the reported value of the first-level codebook comprises:

acquiring the change frequency of the reported value of the first-stage codebook in the reporting period of the pre-coding type indication information;

and determining the precoding type indication information according to the change frequency of the reported value of the first-stage codebook.

4. The communication method according to claim 3, wherein the determining the precoding type indicator according to the change frequency of the reported value of the first-level codebook comprises:

acquiring a frequency domain coherent bandwidth value of a channel;

and determining the precoding type indication information according to the change frequency of the reported value of the first-stage codebook and the frequency domain coherence bandwidth value of the channel.

5. The communication method of claim 1, wherein the method further comprises:

acquiring rank indication information of a channel;

and determining the precoding type indication information according to the rank indication information of the channel.

6. A communication method applied to a network device, the method comprising:

receiving pre-coding type indication information reported by terminal equipment;

the pre-coding type indication information is determined according to a reported value of a first-stage codebook of a pre-coding matrix, and the reported value of the first-stage codebook is determined according to a broadband mutual information value corresponding to the pre-coding matrix.

7. The communication method of claim 6, wherein the determination of the reported value of the first-level codebook comprises:

8. The communication method according to claim 6, wherein the determining of the precoding type indicator information comprises:

9. The communication method according to claim 8, wherein the determining of the precoding type indicator information comprises:

acquiring a frequency domain coherent bandwidth value of a channel;

10. The communication method according to claim 6, wherein the determining of the precoding type indicator further comprises:

acquiring rank indication information of a channel;

11. A terminal device, comprising a processing unit and a communication unit,

the processing unit is configured to: determining a reported value of a first-stage codebook of a pre-coding matrix according to a broadband mutual information value corresponding to the pre-coding matrix; determining pre-coding type indication information according to the reported value of the first-stage codebook; and reporting the pre-coding type indication information to network equipment through the communication unit.

12. A network device comprising a processing unit and a communication unit,

the processing unit receives the indication information of the pre-coding type reported by the terminal equipment through the communication unit; the pre-coding type indication information is determined according to a reported value of a first-stage codebook of a pre-coding matrix, and the reported value of the first-stage codebook is determined according to a broadband mutual information value corresponding to the pre-coding matrix.