Patent Publication Number: US-2020280963-A1

Title: User equipment and access device

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of International Application No. PCT/CN2018/112255, filed on Oct. 27, 2018, which claims priority to Chinese Patent Application No. 201711148365.9, filed on Nov. 17, 2017. The disclosures of the aforementioned applications are hereby incorporated by reference in their entireties. 
    
    
     TECHNICAL FIELD 
     Embodiments of the present invention relate to channel measurement technologies, and in particular, to channel measurement technologies for user equipment and an access device. 
     BACKGROUND 
     Transmission efficiency of wireless communications is closely related to a channel condition. Therefore, selecting a transmission parameter that matches the channel condition is critical to the wireless communications. For example, when the channel condition is relatively good, a relatively radical modulation and coding scheme (MCS) may be selected to improve a transmission throughput. When the channel condition is relatively poor, a relatively conservative MCS may be selected to improve transmission robustness. 
     Usually, the channel condition may be determined through channel measurement. Downlink channel measurement is used as an example. User equipment (for example, but not limited to a smartphone) receives a downlink reference signal sent by an access device (for example, but not limited to a base station), determines a downlink channel condition based on the downlink reference signal, and notifies the access device of the downlink channel condition. In this way, the access device selects an appropriate transmission parameter. 
     A result of the channel measurement may be usually represented by using channel state information (CSI). For example, the CSI may include, but is not limited to, one or more of the following information: a channel quality indicator (CQI), a precoding matrix indicator (PMI), a precoding type indicator (PTI), and a CSI reference signal resource indicator (CSI-RS Resource Indicator, CRI), a rank indication (RI), and other information. 
     Usually, the channel measurement needs to be performed based on a specific measurement mechanism. Different measurement mechanisms usually have different measurement processes and measurement results. A latest research shows that a next generation wireless communications system introduces a measurement mechanism which is referred to as semi-persistent measurement. In the semi-persistent measurement, a CQI of a CSI reporting band is calculated by using a precoding resource block group (PRG) as a basic unit. Therefore, a PRG size is crucial to the semi-persistent measurement. To enable the PRG size to be flexibly changed based on a specific requirement, the PRG size may be indicated through configuration. 
     However, it is not difficult to understand that configuring the PRG size by using dedicated configuration signaling inevitably causes signaling overheads, and affects transmission efficiency. Therefore, there is no mechanism to reduce the signaling overheads caused by configuring the PRG size. 
     SUMMARY 
     In view of this, it is necessary to provide user equipment, to help reduce signaling overheads caused by configuring a PRG size. 
     In addition, an access device is provided, to help reduce the signaling overheads caused by configuring the PRG size. 
     According to a first aspect of the embodiments of the present invention, user equipment is provided, including: 
     a transceiver module, configured to receive configuration information, where the configuration information is used to configure at least one PRB bundling size; and 
     a processing module, configured to determine a PRG size based on the at least one PRB bundling size. 
     According to a second aspect of the embodiments of the present invention, an access device is provided, including: 
     a processing module, configured to generate configuration information, where the configuration information is used to configure a plurality of PRB bundling sizes, and in the plurality of PRB bundling sizes, a PRB bundling size whose arrangement location is a preset location is used as a PRG size; and 
     a transceiver module, configured to send the configuration information. 
     According to a third aspect of the embodiments of the present invention, an access device is provided, including: 
     a processing module, configured to generate configuration information, where the configuration information is used to configure a plurality of PRB bundling sizes, the configuration information includes indication information, and the indication information is used to indicate a PRB bundling size that is in the plurality of PRB bundling sizes and that is used as a PRG size; and 
     a transceiver module, configured to send the configuration information. 
     According to a fourth aspect of the embodiments of the present invention, user equipment is provided, including: 
     a transceiver, configured to receive configuration information, where the configuration information is used to configure at least one PRB bundling size; and 
     a processor, configured to determine a PRG size based on the at least one PRB bundling size. 
     According to a fifth aspect of the embodiments of the present invention, an access device is provided, including: 
     a processor, configured to generate configuration information, where the configuration information is used to configure a plurality of PRB bundling sizes, and in the plurality of PRB bundling sizes, a PRB bundling size whose arrangement location is a preset location is used as a PRG size; and 
     a transceiver, configured to send the configuration information. 
     According to a sixth aspect of the embodiments of the present invention, an access device is provided, including: 
     a processor, configured to generate configuration information, where the configuration information is used to configure a plurality of PRB bundling sizes, the configuration information includes indication information, and the indication information is used to indicate a PRB bundling size that is in the plurality of PRB bundling sizes and that is used as a PRG size; and 
     a transceiver, configured to send the configuration information. 
     In an example implementation process, the processor may be configured to perform, for example, but is not limited to, baseband related processing, and the transceiver may be configured to perform, for example, but is not limited to, radio frequency receiving and sending. The foregoing components may be separately disposed on chips that are independent of each other, or at least some or all of the foregoing components may be disposed on a same chip. For example, the transceiver may be disposed on a transceiver chip. For another example, the processor may be further classified into an analog baseband processor and a digital baseband processor. The analog baseband processor and the transceiver may be integrated into a same chip, and the digital baseband processor may be disposed on an independent chip. With continuous development of integrated circuit technologies, more components can be integrated into a same chip. For example, the digital baseband processor and a plurality of application processors (for example, but not limited to a graphics processor and a multimedia processor) may be integrated into a same chip. Such a chip may be referred to as a system on chip. Whether all the components are separately disposed on different chips or integrated and disposed on one or more chips usually depends on a specific requirement for a product design. A specific implementation of the components is not limited in the embodiments of the present invention. 
     According to a seventh aspect of the embodiments of the present invention, a configuration method is provided, including: 
     receiving configuration information, where the configuration information is used to configure at least one PRB bundling size; and 
     determining a PRG size based on the at least one PRB bundling size. 
     According to an eighth aspect of the embodiments of the present invention, a configuration method is provided, including: 
     generating configuration information, where the configuration information is used to configure a plurality of PRB bundling sizes, and in the plurality of PRB bundling sizes, a PRB bundling size whose arrangement location is a preset location is used as a PRG size; and 
     sending the configuration information. 
     According to a ninth aspect of the embodiments of the present invention, a configuration method is provided, including: 
     generating configuration information, where the configuration information is used to configure a plurality of PRB bundling sizes, the configuration information includes indication information, and the indication information is used to indicate a PRB bundling size that is in the plurality of PRB bundling sizes and that is used as a PRG size; and 
     sending the configuration information. 
     According to a tenth aspect of the embodiments of the present invention, a processor is provided, configured to perform the foregoing methods. In a process of performing these methods, a process of sending configuration information and a process of receiving the configuration information in the foregoing methods may be understood as a process of outputting the configuration information by the processor and a process of receiving input configuration information by the processor. Specifically, when outputting the configuration information, the processor outputs the configuration information to a transceiver, so that the transceiver transmits the configuration information. Still further, after the configuration information is output by the processor, other processing may further need to be performed on the configuration information before the configuration information arrives at the transceiver. Similarly, when the processor receives the input configuration information, the transceiver receives the configuration information, and inputs the configuration information into the processor. Further, after the transceiver receives the configuration information, other processing may need to be performed on the configuration information before the configuration information is input into the processor. 
     Based on the foregoing principle, for example, the receiving the configuration information mentioned in the foregoing method may be understood as receiving the input configuration information by the processor. For another example, the sending the configuration information may be understood as outputting the configuration information by the processor. 
     In this case, for operations such as transmission, sending, and receiving related to the processor, if there is no particular statement, or if the operations do not contradict an actual function or internal logic of the operations in related description, the operations may be more generally understood as operations such as input receiving and output of the processor, instead of operations such as transmission, sending, and receiving directly performed by a radio frequency circuit and an antenna. 
     In a specific implementation process, the processor may be a processor specially configured to perform these methods, or may be a processor that executes computer instructions in a memory to perform these methods, for example, a general purpose processor. In this case, the processor and the memory belong to a communications device, for example, are included in the communications device. The memory may be a non-transitory memory, for example, a read only memory (ROM). The memory and the processor may be integrated into a same chip, or may be separately disposed on different chips. A type of the memory and a manner of disposing the memory and the processor are not limited in the embodiments of the present invention. 
     According to an eleventh aspect of the embodiments of the present invention, a computer-readable storage medium is provided, including instructions, where when the instructions are run on a computer, the computer is enabled to perform any one of the foregoing methods. 
     The computer-readable storage medium is non-transitory. 
     According to a twelfth aspect of the embodiments of the present invention, a computer program product including instructions is provided, where when the instructions are run on a computer, the computer is enabled to perform any one of the foregoing methods. 
     According to the foregoing aspects of the embodiments of the present invention, in a possible implementation, the at least one PRB bundling size includes one PRB bundling size, and the PRG size is the PRB bundling size. 
     According to the foregoing aspects of the embodiments of the present invention, in a possible implementation, the at least one PRB bundling size includes a plurality of PRB bundling sizes, and the PRG size is a PRB bundling size that is in the plurality of PRB bundling sizes and that is indicated by a preset indication rule. 
     According to the foregoing aspects of the embodiments of the present invention, in a possible implementation, the preset indication rule is one or a combination of the following rules: 
     a rule 1: a maximum value of the plurality of PRB bundling sizes is used as the PRG size; 
     a rule 2 a minimum value of the plurality of PRB bundling sizes is used as the PRG size; and 
     a rule 3: in the plurality of PRB bundling sizes, a PRB bundling size whose arrangement location is a preset location is used as the PRG size. 
     According to the foregoing aspects of the embodiments of the present invention, in a possible implementation, the preset location is the first location or the last location. 
     According to the foregoing aspects of the embodiments of the present invention, in a possible implementation, the configuration information includes indication information, and the indication information is used to indicate the PRB bundling size that is in the plurality of PRB bundling sizes and that is used as the PRG size. 
     According to the foregoing aspects of the embodiments of the present invention, in a possible implementation, the configuration information is sent by using radio resource control RRC signaling. 
     In technical solutions provided in the embodiments of the present invention, a PRG size is configured by configuring a PRB bundling size. In this way, there is no need to set dedicated signaling for configuring the PRG size. This helps reduce signaling overheads caused by configuring the PRG size. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a schematic diagram of an example wireless communications network according to an embodiment of the present invention; 
         FIG. 2  is a schematic diagram of an example logical structure of user equipment according to an embodiment of the present invention; 
         FIG. 3  is a schematic diagram of an example logical structure of an access device according to an embodiment of the present invention; 
         FIG. 4  is a schematic diagram of an example logical structure of an access device according to an embodiment of the present invention; 
         FIG. 5  is a flowchart of an example configuration method according to an embodiment of the present invention; 
         FIG. 6  is a flowchart of an example configuration method according to an embodiment of the present invention; 
         FIG. 7  is a flowchart of an example configuration method according to an embodiment of the present invention; and 
         FIG. 8  is a schematic diagram of an example hardware structure of a communications device according to an embodiment of the present invention. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     A next generation wireless communications system being currently developed may be referred to as a new radio (NR) system or a 5G system. According to the latest research, in the next-generation wireless communications system, a measurement mechanism includes at least semi-open-loop measurement and closed-loop measurement. The semi-open-loop measurement may also be referred to as a semi-open-loop feedback. The closed-loop measurement may also be referred to as a closed-loop feedback. 
     The semi-open-loop measurement may be used to perform channel measurement on a CSI reporting band. The CSI reporting band may be understood as a frequency band on which CSI needs to be reported. Further, the CSI reporting band may include a plurality of subbands. These subbands may be continuous, or may be incontinuous, or at least some subbands may be continuous. Continuity of these subbands is not limited in embodiments of the present invention. Furthermore, these subbands may belong to a same specific frequency band, and the specific frequency band may be set based on a requirement. This embodiment does not set any limitation on the specific frequency band. For example, the specific frequency band may be a bandwidth part. The bandwidth part may be understood as one continuous frequency band. The frequency band includes at least one continuous subband. Each bandwidth part may correspond to one group of numerologies, including but not limited to a subcarrier spacing and a cyclic prefix (CP). Different bandwidth parts may correspond to different system numerologies. Optionally, within a same transmission time interval (TTI), in a plurality of bandwidth parts, only one bandwidth part may be available and other bandwidth parts are unavailable. In addition to the foregoing features, in an example implementation process, a definition of the CSI reporting band may be further limited. 
     When the semi-open-loop measurement is performed on the CSI reporting band, fed-back CSI may include CSI of an entire CSI reporting band. The CSI of the entire CSI reporting band herein may also be referred to as wideband CSI of the CSI reporting band. The CSI refers to CSI obtained by calculating the CSI reporting band as a whole instead of a set of CSI obtained by performing the semi-open-loop measurement on each part (for example, but not limited to each sub-band) of the CSI reporting band. For example, a CQI of the entire CSI reporting band may be calculated in, for example, but not limited to, the following manner. For each PRG included in the CSI reporting band, a precoding matrix is randomly selected from a codebook. The codebook may be a codebook indicated by codebook subset restriction signaling. The codebook is usually determined based on channel statistics information. Therefore, the codebook can match a change trend of a channel condition to some extent. A channel matrix corresponding to the PRG is multiplied by the precoding matrix, to obtain an equivalent channel matrix of the PRG, and a signal to interference plus noise ratio (SINR) of the equivalent channel matrix is determined. An average value of SINRs of all PRGs included in the CSI reporting band or another value that can reflect an overall SINR of the CSI reporting band is calculated, a corresponding CQI is determined based on the value, and the corresponding CQI is used as the CQI of the entire CSI reporting band. 
     The closed-loop measurement may be used to perform the channel measurement on a CSI reporting band, a subband, a subband group, or the like. For example, when the closed-loop measurement is performed on the subband, a precoding matrix may be selected from a codebook according to a rule such as channel capacity maximization or throughput maximization, and the precoding matrix is reported by using a PMI. In addition, a channel matrix of the subband may be multiplied by the precoding matrix to obtain an equivalent channel matrix of the subband. After a SINR of the equivalent channel matrix is calculated, a corresponding CQI may be determined based on the SINR. When a CQI of the subband group is calculated, the CQI corresponding to the subband group may also be obtained with reference to the method for calculating the average value of the SINR during the semi-persistent measurement. A person skilled in the art should understand that, in a specific implementation process, the CQI may also be calculated by using another method, and a specific calculation method is not limited in embodiments of the present invention. 
     A channel measurement process is before data transmission. Therefore, during data transmission, CSI determined in the channel measurement process may change. In a low-speed scenario, the channel condition does not change rapidly. Therefore, during data transmission, the CSI that is previously determined in the channel measurement process does not change greatly. In this case, because in the closed-loop measurement, the CSI is determined based on the channel condition, the CSI is more suitable for the channel condition. Therefore, a data transmission effect is better. However, in a high-speed scenario, the channel condition changes rapidly. During data transmission, the CSI that is previously determined in the channel measurement process may change greatly. Consequently, the CSI that previously obtained through measurement is outdated, and cannot match the channel condition. In this case, the CSI determined through the semi-open-loop measurement can usually achieve a better effect. As described above, the precoding matrix used in the semi-open-loop measurement is selected from a specific codebook. The codebook is determined based on the channel statistics information, and may match a change trend of the channel condition to some extent. Therefore, even if the codebook is randomly selected, the codebook matches the channel condition to some extent. On the other hand, the CQI determined through the semi-open-loop measurement is determined based on a plurality of randomly selected precoding matrices in a unit of a PRG, and a diversity transmission effect is introduced to some extent. Therefore, the transmission effect is more robust. 
     When downlink channel measurement is performed, the process of calculating the CSI is usually performed by the user equipment. The user equipment determines the CSI, and reports the CSI to an access device. 
     For further details about the semi-open-loop measurement and the closed-loop measurement, reference may be made to the existing technologies, for example, but not limited to existing technical standards and proposals related to the next-generation wireless communications system. As research makes progress, in the next-generation wireless communications system, operation details of the semi-open-loop measurement and the closed-loop measurement may also change. However, after understanding the technical solutions provided in the embodiments of the present invention, a person skilled in the art should understand that the technical solutions provided in the embodiments of the present invention are also applicable to changed semi-open-loop measurement and closed-loop measurement. 
     It can be learned from the foregoing description that in the semi-open-loop measurement, an SINR needs to be calculated by using a PRG as a basic unit in a CQI calculation process. Therefore, a PRG size is crucial to the semi-open-loop measurement. The PRG size may be usually understood as a frequency band width of the PRG. Usually, the PRG includes a plurality of resource blocks (RB). Therefore, the PRG size may be specifically a quantity of RBs included in the PRG. To enable the PRG size to be flexibly changed based on a specific requirement, the PRG size may be indicated in a configuration manner. However, it is not difficult to understand that configuring the PRG size inevitably causes signaling overheads, and affects transmission efficiency. 
     A precoding technology is one of core MIMO technologies. According to the precoding technology, a to-be-transmitted signal is processed by using a precoding matrix that matches an attribute of a channel, so that a precoded to-be-transmitted signal matches the channel Therefore, a transmission process is optimized, and received signal quality (for example, an SINR) is improved. Currently, the precoding technology is adopted by a plurality of wireless communications standards, for example, but is not limited to long term evolution (LTE). 
     In a process of precoding data transmission, a width of a frequency band on which precoding is performed based on a same precoding matrix usually needs to be determined. The width of the frequency band is usually indicated by a physical resource block bundling size (PRB (Physical RB) bundling size). In comparison, as described above, when the CQI is calculated based on the semi-persistent measurement, each randomly selected precoding matrix is used to precode one PRG. Therefore, a width of a frequency band to which the randomly selected precoding matrix is applicable is a width of a frequency band of the PRG, namely, a PRG size. It can be learned that a PRG size used in a semi-persistent measurement process is similar to a PRB bundling size used in a data transmission precoding process. Therefore, it may be attempted to set the PRG size to be equal to the PRB bundling size. In this way, a PRG size associated with channel measurement may be indicated by indicating the PRB bundling size. This reduces signaling overheads caused by configuring the PRG size. 
     According to the latest research, in a next-generation wireless communications system, an access device preconfigures a plurality of PRB bundling sizes for user equipment by using configuration signaling, and a PRB bundling size specifically used in the precoding process is selected by the access device from the plurality of PRB bundling sizes and indicated to the user equipment. Specifically, in a configuration process, the access device configures the plurality of PRB bundling sizes for the user equipment by using radio resource control (RRC) signaling or other signaling. In the precoding process, the access device specifically indicates, by using downlink control information (DCI) or other signaling, the PRB bundling size specifically used in the precoding process. It can be learned that the next-generation wireless communications system notifies the PRB bundling size in a manner of configuration and indication. The configuration process is used to configure the plurality of PRB bundling sizes, and an indication process is used to indicate, in the configured plurality of PRB bundling sizes, the PRB bundling size used in the precoding process. It should be noted that the foregoing manner of notifying the PRB bundling size may not be unique, and another manner of notifying the PRB bundling size may also be defined in a next-generation wireless communications standard. For example, only one PRB bundling size may be configured in a process of configuring the PRB bundling size. In this case, a process of notifying the PRB bundling size only includes the configuration process, and does not need to include the indication process. 
     In addition, when the PRB bundling size that is in the plurality of PRB bundling sizes and that is used in the precoding process is indicated, a plurality of manners may be used for indication, for example, but are not limited to, to-be-indicated information, for example, the to-be-indicated information itself or an index of the to-be-indicated information, may be directly indicated. Alternatively, the to-be-indicated information may be indirectly indicated by indicating other information, and there is an association relationship between the other information and the to-be-indicated information. Alternatively, only a part of the to-be-indicated information may be indicated, and another part of the to-be-indicated information is known or agreed on in advance. In addition, a specific indication manner may alternatively be various combinations of the foregoing indication methods, or the like. In a specific implementation process, a required indication manner may be selected based on a specific requirement. A selected indication manner is not limited in embodiments of the present invention. In this way, the indication manner in embodiments of the present invention should be understood as covering various methods that enable a to-be-indicated party to learn of the to-be-indicated information. In addition, the to-be-indicated information may be sent as a whole, or may be divided into a plurality of pieces of sub-information and sent separately. In addition, sending periods and/or sending occasions of the plurality of pieces of sub-information may be the same, or may be different. For a specific sending method, refer to the existing technologies. This is not limited in embodiments of the present invention. 
     Further, according to the latest research, in an example next-generation wireless communications system, it is recommended that the PRG size is indicated by using RRC signaling or other signaling. In other words, the PRG size is not notified in a manner similar to the manner of configuration and indication used in the process of notifying the PRB bundling size. Therefore, the PRG size may be set to be the same as a PRB bundling size configured by using the RRC signaling or other signaling. In this way, the PRB bundling size may be configured to indicate the PRG size associated with the channel measurement. 
     However, as described above, in a process of configuring the PRB bundling size by using the RRC signaling or other signaling, there are usually a plurality of configured PRB bundling sizes. In this case, it becomes a problem to be resolved with respect to which PRB bundling size of the plurality of PRB bundling sizes is used as the PRG size. 
     A solution to the foregoing problem is to set the PRB bundling sizes configured by using the RRC signaling or other signaling to be the same one. However, this inevitably causes an inflexible PRB bundling size. 
     The embodiments of the present invention provide a technical solution, and the PRG size may be determined according to a preset indication rule and a plurality of configured PRB bundling sizes. The technical solutions provided in the embodiments of the present invention are described in detail with reference to the accompanying drawings and specific embodiments. 
       FIG. 1  is a schematic diagram of an example wireless communications network  100  according to an embodiment of the present invention. As shown in  FIG. 1 , the wireless communications network  100  includes base stations  102 ,  104 , and  106  and terminal devices  108 ,  110 ,  112 ,  114 ,  116 ,  118 ,  120 , and  122 . The base stations  102 ,  104 , and  106  may communicate with each other by using a backhaul link (shown as straight lines between the base stations  102 ,  104 , and  106 ). The backhaul link may be a wired backhaul link (for example, an optical fiber or a copper cable), or may be a wireless backhaul link (for example, a microwave). The terminal devices  108 ,  110 ,  112 ,  114 ,  116 ,  118 ,  120 , and  122  may communicate with corresponding base stations  102 ,  104 , and  106  by using a radio link (shown as polygonal lines between the base stations  102 ,  104 , and  106  and the terminal devices  108 ,  110 ,  112 ,  114 ,  116 ,  118 ,  120 , and  122 ). 
     The base stations  102 ,  104 , and  106  usually provide, as access devices, a radio access service for the terminal devices  108 ,  110 ,  112 ,  114 ,  116 ,  118 ,  120 , and  122  that generally serve as user equipment. Specifically, each base station corresponds to a service coverage area (which may be referred to as a cellular, shown in an oval area in  FIG. 1 ), and a terminal device entering the area may communicate with the base stations by using a radio signal, to receive the wireless access services provided by the base stations. Service coverage areas of the base stations may overlap. A terminal device in an overlapping area may receive radio signals from a plurality of base stations. Therefore, these base stations may coordinate with each other, to provide a service for the terminal device. For example, the plurality of base stations may provide the service for the terminal device in the overlapping area by using a coordinated multipoint (CoMP) technology. For example, as shown in  FIG. 1 , a service coverage area of the base station  102  overlaps a service coverage area of the base station  104 , and the terminal device  112  falls into the overlapping area. Therefore, the terminal device  112  may receive radio signals from the base station  102  and the base station  104 . The base station  102  and the base station  104  may coordinate with each other, to provide a service for the terminal device  112 . As another example, as shown in  FIG. 1 , a common overlapping area exists in service coverage areas of the base stations  102 ,  104 , and  106 , and the terminal device  120  falls into the overlapping area. Therefore, the terminal device  120  may receive radio signals from the base stations  102 ,  104 , and  106 . The base stations  102 ,  104 , and  106  may coordinate with each other, to provide a service for the terminal device  120 . 
     Depending on a wireless communications technology in use, a base station may also be referred to as a NodeB, an evolved NodeB (eNodeB), an access point (AP), or the like. In addition, based on a size of a coverage area in which a service is provided, a base station may be classified into a macro base station for providing a macro cell, a micro base station for providing a micro cell (Pico cell), a femto base station for providing a femto cell, and the like. With evolution of the wireless communications technologies, the base stations may have other names in the future. 
     The terminal devices  108 ,  110 ,  112 ,  114 ,  116 ,  118 ,  120 , and  122  may be various wireless communications devices that have a wireless communications function, for example, but are not limited to a mobile cellular phone, a cordless phone, a personal digital assistant (PDA), a smartphone, a notebook computer, a tablet computer, a wireless data card, and a wireless modem (Modulator demodulator, Modem), or a wearable device such as a smart watch. With emergence of internet of things (IOT) technologies and internet of vehicles (Vehicle-to-everything, V2X) technologies, more and more devices that do not have a communications function before, for example, but are not limited to a household appliance, a transportation vehicle, a tool device, a service device, and a service facility, start to obtain a wireless communications function by configuring a wireless communications unit, access a wireless communications network, and under remote control. This type of device has the wireless communications function because the wireless communications unit is configured for this type of device. Therefore, this type of device is also a kind of wireless communications device. In addition, the terminal devices  108 ,  110 ,  112 ,  114 ,  116 ,  118 ,  120 , and  122  may be further referred to as mobile stations, mobile devices, mobile terminals, wireless terminals, handheld devices, clients, and the like. 
     A plurality of antennas may be configured for the base stations  102 ,  104 , and  106  and the terminal devices  108 ,  110 ,  112 ,  114 ,  116 ,  118 ,  120  and  122 , to support a MIMO (Multiple-Input Multiple-Output) technology. Further, the base stations  102 ,  104 , and  106  and the terminal devices  108 ,  110 ,  112 ,  114 ,  116 ,  118 ,  120 , and  122  may not only support a single-user MIMO (SU-MIMO) technology, but also support a multi-user MIMO (MU-MIMO) technology. The MU-MIMO may be implemented based on a space division multiple access (SDMA) technology. Because the plurality of antennas are configured, the base stations  102 ,  104 , and  106  and the terminal devices  108 ,  110 ,  112 ,  114 ,  116 ,  118 ,  120 , and  122  may further flexibly support a single input single output (SISO) technology, a single input multiple output (SIMO) technology, and a multiple input single output (MISO) technology, to implement various diversity (for example, but not limited to, transmit diversity and receive diversity) and multiplexing technologies. The diversity technology may include, for example, but is not limited to, a transmit diversity (TD) technology and a receive diversity (RD) technology, and the multiplexing technology may be a spatial multiplexing technology. In addition, the foregoing technologies may further include a plurality of implementation solutions. For example, the transmit diversity technology may include diversity manners such as space-time transmit diversity (STTD), space-frequency transmit diversity (SFTD), time switched transmit diversity (TSTD), frequency switched transmit diversity (FSTD), orthogonal transmit diversity (OTD), and cyclic delay diversity (CDD), and diversity manners obtained by deriving, evolving, and combining the foregoing diversity manners. For example, currently, transmit diversity manners such as space time block coding (STBC), space frequency block coding (SFBC), and the CDD are used in LTE (Long Term Evolution) standard. A general description of transmit diversity is provided above by using examples. A person skilled in the art needs to understand that, in addition to the foregoing examples, the transmit diversity is further implemented in a plurality of other manners. Therefore, the foregoing descriptions should not be understood as limitations on the technical solutions of the present invention, and it should be understood that the technical solutions of the present invention are applicable to various possible transmit diversity solutions. 
     In addition, the base stations  102 ,  104 , and  106  and the terminal devices  108 ,  110 ,  112 ,  114 ,  116 ,  118 ,  120 , and  122  may communicate with each other by using various wireless communications technologies, for example, but not limited to, a time division multiple access (TDMA) technology, a frequency division multiple access (FDMA) technology, a code division multiple access (CDMA) technology, a time division-synchronous code division multiple access (TD-SCDMA) technology, an orthogonal frequency division multiple access (Orthogonal FDMA, OFDMA) technology, a single carrier frequency division multiple access (Single Carrier FDMA, SC-FDMA) technology, and a space division multiple access (SDMA) technology, and evolved and derived technologies of these technologies. As radio access technologies (RAT), the foregoing wireless communications technologies are adopted by various wireless communications standards, so that various existing wireless communications systems (or networks) are constructed. These wireless communications systems include, but are not limited to, a global system for mobile communications (GSM), CDMA 2000, wideband CDMA (WCDMA), Wi-Fi defined in a 802.11 series standard, worldwide interoperability for microwave access (WiMAX), long term evolution (LTE), LTE-advanced (LTE-A), and evolved systems of these wireless communications systems. Unless otherwise specified, the technical solutions provided in the embodiments of the present invention may be applied to the foregoing various wireless communications technologies and wireless communications systems. In addition, the terms “system” and “network” can be interchanged with each other. 
     It should be noted that the wireless communications network  100  shown in  FIG. 1  is merely used as an example, and is not intended to limit the technical solutions of the present invention. A person skilled in the art should understand that in a specific implementation process, the wireless communications network  100  may further include another device, and a quantity of base stations and a quantity of terminal devices may be further configured based on a specific requirement. 
       FIG. 2  is a schematic diagram of an example logical structure of user equipment  200  according to an embodiment of the present invention. As shown in  FIG. 2 , the user equipment  200  includes a transceiver module  202  and a processing module  204 . 
     The transceiver module  202  is configured to receive configuration information, and the configuration information is used to configure at least one PRB bundling size. 
     The processing module  204  is configured to determine a PRG size based on the at least one PRB bundling size. 
     Specifically, the PRG size may be a PRG size associated with channel measurement. The PRG size may be the same as or different from a PRG size that is in a data transmission process. The data transmission may be, for example, but is not limited to, data transmission performed by using a physical downlink shared channel (PDSCH). 
     In the technical solution provided in this embodiment of the present invention, the PRG size is configured by configuring the PRB bundling size. In this way, there is no need to set dedicated signaling for configuring the PRG size. This helps reduce signaling overheads caused by configuring the PRG size. 
     In a specific implementation process, the configuration information comes from an access device, and the configuration information may be sent by using, for example, but not limited to, one of the following signaling: 
     physical layer signaling; 
     media access control layer signaling; and 
     radio resource control signaling. 
     The physical layer signaling is also referred to as layer 1 (L1) signaling, and may usually be carried in a control part in a physical layer frame. A typical example of the L1 signaling is DCI carried on a physical downlink control channel (PDCCH) and uplink control information (UCI) carried in a physical uplink control channel (PUCCH) that are defined in an LTE standard. In some cases, the L1 signaling may alternatively be carried in a data part in the physical layer frame. For example, sometimes, the UCI may alternatively be carried on a physical uplink shared channel (PUSCH). It is not difficult to learn that a sending period or a signaling period of the L1 signaling is usually a period of the physical layer frame. Therefore, the signaling is usually used to implement some dynamic control, to transfer some frequently changed information. For example, resource allocation information may be transferred by using physical layer signaling. 
     The media access control (MAC) layer signaling belongs to layer 2 signaling, and may be usually carried in, for example, but not limited to, a frame header of a layer 2 frame. The frame header may further carry, for example, but not limited to, information such as a source address and a destination address. In addition to the frame header, the layer 2 frame usually further includes a frame body. In some cases, the L2 signaling may alternatively be carried in the frame body of the layer 2 frame. A typical example of the layer 2 signaling is signaling carried in a frame control field in a frame header of a MAC frame in 802.11 series of standards, or a MAC control entity (MAC-CE) defined in some protocols. The layer 2 frame may be usually carried in the data part of the physical layer frame. The configuration information may alternatively be sent by using other layer 2 signaling than the media access control layer signaling. 
     The RRC signaling belongs to layer 3 signaling, and is usually some control messages. The L3 signaling may be usually carried in the frame body of the layer 2 frame. A sending period or a control period of the L3 signaling is usually relatively long, and the L3 signaling is applicable to sending of some information that does not change frequently. For example, in some existing communications standards, the L3 signaling is usually used to carry some configuration information. The configuration information may alternatively be sent by using other layer 3 signaling than the RRC signaling. 
     The foregoing describes only principles of the physical layer signaling, the MAC layer signaling, the RRC signaling, the layer 1 signaling, the layer 2 signaling, and the layer 3 signaling. For details about the three types of signaling, refer to the related art. 
     In a specific implementation process, the configuration information may be preferentially transmitted by using the layer 3 signaling, for example, but not limited to the RRC signaling. This is because a plurality of PRB bundling sizes configured by using the configuration information usually do not change frequently. 
     For related technical contents of the PRB bundling size, refer to the related art. 
     The at least one PRB bundling size may include only one PRB bundling size. In this case, the processing module  204  may use the PRB bundling size as the PRG size. As described above, one PRB bundling size configured by using the RRC signaling or other signaling may be set. In this case, the specified PRB bundling size is used as the PRG size. However, as described above, this method inevitably causes an inflexible PRB bundling size. 
     The at least one PRB bundling size may alternatively include a plurality of PRB bundling sizes. In this case, the PRG size is a PRB bundling size that is in the plurality of PRB bundling sizes and that is indicated by a preset indication rule. Specifically, the indication rule may be, for example, but is not limited to, one or a combination of the following rules: 
     a rule 1: a maximum value of the plurality of PRB bundling sizes is used as the PRG size; 
     a rule 2 a minimum value of the plurality of PRB bundling sizes is used as the PRG size; and 
     a rule 3: in the plurality of PRB bundling sizes, a PRB bundling size whose arrangement location is a preset location is used as the PRG size, for example, the preset location may be set as the first location or the last location. 
     Usually, when the configuration information includes a plurality of PRB bundling sizes, these PRB bundling sizes are usually arranged in the configuration information in a specific order. In this way, the PRB bundling size used as the PRG size may be determined according to the rule 3. 
     In another implementation solution, the configuration information further includes indication information, and the indication information is used to indicate the PRB bundling size that is in the plurality of PRB bundling sizes and that is used as the PRG size. Specifically, the indication information may indicate an index of the PRB bundling size, or the indication information may indicate how to select, in the plurality of PRB bundling sizes, the PRB bundling size used as the PRG size. For example, the indication information may indicate one or a combination of the foregoing rules. 
     The following describes the foregoing rules and solutions in detail by using specific examples. 
     It is assumed that specific information included in the configuration information is shown in Table 1. 
     
       
         
           
               
               
               
             
               
                   
                 TABLE 1 
               
               
                   
                   
               
               
                   
                 Index 
                 PRB bundling size 
               
               
                   
                   
               
             
            
               
                   
                 1 
                 2 
               
               
                   
                 2 
                 4 
               
               
                   
                 3 
                 8 
               
               
                   
                   
               
            
           
         
       
     
     It can be learned from Table 1 that the configuration information includes three PRB bundling sizes that are sequentially arranged, which are respectively 2, 4, and 8, and indexes of the three PRB bundling sizes are respectively 1, 2, and 3. When the indication rule is the rule 1, the determined PRG size is 8. When the indication rule is the rule 2, the determined PRG size is 2. When the indication rule is the rule 3 and the preset location in the rule 3 is a location 1, the determined PRG size is 2. 
     For another example, the indication information in the configuration information further indicates that the PRG size is a PRB bundling size, that is, 4, at an arrangement location 2. For another example, the indication information further indicates that the PRG size is a PRB bundling size, that is, 8, whose index is 3. 
       FIG. 3  is a schematic diagram of an example logical structure of an access device  300  according to an embodiment of the present invention. As shown in  FIG. 3 , the access device  300  includes a processing module  302  and a transceiver module  304 . 
     The processing module  302  is configured to generate configuration information, and the configuration information is used to configure a plurality of PRB bundling sizes, and in the plurality of PRB bundling sizes, a PRB bundling size whose arrangement location is a preset location is used as a PRG size. 
     The transceiver module  304  is configured to send the configuration information. 
     Specifically, the configuration information is sent to user equipment. 
     As described above, the configuration information may be used to configure the plurality of PRB bundling sizes. In this case, the PRG size is a PRB bundling size that is in the plurality of PRB bundling sizes and that is indicated by a preset indication rule. Still further, according to the preset indication rule, in the plurality of PRB bundling sizes configured by using the configuration information, a PRB bundling size whose arrangement location is the preset location may be used as the PRG size. In a specific implementation process, the preset location may be set as the first location or the last location. 
     In this case, to help the user equipment determine, according to the preset rule, the PRB bundling size that is in the plurality of PRB bundling sizes and that is used as the PRG size, when generating the configuration information, the access device needs to arrange the PRB bundling size used as the PRG size at the preset location in the plurality PRB bundling sizes configured by using the configuration information. 
     Various technical details related to the access device  300  have been described in detail above with reference to the user equipment  200 . 
       FIG. 4  is a schematic diagram of an example logical structure of an access device  400  according to an embodiment of the present invention. As shown in  FIG. 4 , the access device  400  includes a processing module  402  and a transceiver module  404 . 
     The processing module  402  is configured to generate configuration information, and the configuration information is used to configure a plurality of PRB bundling sizes, the configuration information includes indication information, and the indication information is used to indicate a PRB bundling size that is in the plurality of PRB bundling sizes and that is used as a PRG size. 
     The transceiver module  404  is configured to send the configuration information. 
     Specifically, the configuration information is sent to user equipment. 
     Various technical details related to the access device  400  have been described in detail above with reference to the user equipment  200 . 
       FIG. 5  is an example flowchart of a configuration method  500  according to an embodiment of the present invention. In a specific implementation process, the method  500  may be performed by user equipment. 
     Step  502 : Receive configuration information, where the configuration information is used to configure at least one PRB bundling size. 
     Step  504 : Determine a PRG size based on the at least one PRB bundling size. 
     Related technical details in the method  500  are described in detail above. 
       FIG. 6  is an example flowchart of a configuration method  600  according to an embodiment of the present invention. In a specific implementation process, the method  600  may be performed by an access device. 
     Step  602 : Generate configuration information, where the configuration information is used to configure a plurality of PRB bundling sizes, and in the plurality of PRB bundling sizes, a PRB bundling size whose arrangement location is a preset location is used as a PRG size. 
     Step  604 : Send the configuration information. 
     Related technical details in the method  600  are described in detail above. 
       FIG. 7  is an example flowchart of a configuration method  700  according to an embodiment of the present invention. In a specific implementation process, the method  700  may be performed by an access device. 
     Step  702 : Generate configuration information, where the configuration information is used to configure a plurality of PRB bundling sizes, the configuration information includes indication information, and the indication information is used to indicate a PRB bundling size that is in the plurality of PRB bundling sizes and that is used as a PRG size. 
     Step  704 : Send the configuration information. 
     Related technical details in the method  700  are described in detail above. 
     It can be easily learned that the methods  500  to  700  correspond to the user equipment  200 , the access device  300 , and the access device  400 , and the foregoing operations of the foregoing devices are the foregoing methods. The related technical solutions are described in detail above with reference to the user equipment  200 , the access device  300 , and the access device  400 . 
       FIG. 8  is a schematic diagram of a hardware structure of a communications device  800  according to an embodiment of the present invention. In a specific implementation process, the communications device  800  may be configured to implement user equipment, for example, the user equipment  200 , or may be configured to implement an access device, for example, the access device  300  or the access device  400 . 
     As shown in  FIG. 8 , the communications device  800  includes a processor  802 , a transceiver  804 , a plurality of antennas  806 , a memory  808 , an I/O (Input/Output) interface  810 , and a bus  812 . The memory  808  is further configured to store instructions  8082  and data  8084 . In addition, the processor  802 , the transceiver  804 , the memory  808 , and the I/O interface  810  are communicatively connected to each other by using the bus  812 . The plurality of antennas  806  are connected to the transceiver  804 . In a specific implementation process, the processor  802 , the transceiver  804 , the memory  808 , and the I/O interface  810  may also be communicatively connected to each other in another connection manner other than the bus  812 . 
     The processor  802  may be a general-purpose processor, for example, but not limited to, a central processing unit (CPU), or may be a dedicated processor, for example, but not limited to, a digital signal processor (DSP), an application specific integrated circuit (ASIC), and a field programmable gate array (FPGA). In addition, the processor  802  may alternatively be a combination of a plurality of processors. Particularly, in the technical solutions provided in the embodiments of the present invention, when the communications device  800  is configured to implement the user equipment, the processor  802  may be configured to perform the operations performed by the processing module  204  in the user equipment  200 . When the communications device  800  is configured to implement the access device, the processor  802  may be configured to perform operations performed by the processing modules  302  and  402  in the access device  300  and the access device  400 . The processor  802  may be a processor configured to perform the foregoing operations, or may be a processor that performs the foregoing operations by reading and executing the instructions  8082  stored in the memory  808 . The processor  802  may need to use the data  8084  in a process of performing the foregoing operations. 
     The transceiver  804  is configured to send a signal by using at least one of the plurality of antennas  806 , and receive a signal by using at least one of the plurality of antennas  806 . Particularly, in the technical solutions provided in the embodiments of the present invention, when the communications device  800  is configured to implement the user equipment, the processor  802  may be configured to perform the operations performed by the transceiver module  202  in the user equipment  200 . When the communications device  800  is configured to implement the access device, the processor  802  may be configured to perform operations performed by the transceiver modules  304  and  404  in the access device  300  and the access device  400  respectively. 
     The memory  808  may be various types of storage media, for example, a random access memory (RAM), a read only memory (ROM), a non-volatile RAM (NVRAM), a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), a flash memory, an optical memory, and a register. The memory  808  is specifically configured to store the instructions  8082  and the data  8084 . The processor  802  may perform the foregoing operations by reading and executing the instructions  8082  stored in the memory  808 , and may need to use the data  8084  in a process of performing the foregoing operations. 
     The I/O interface  810  is configured to receive an instruction and/or data from a peripheral device, and output an instruction and/or data to the peripheral device. 
     It should be noted that in a specific implementation process, the communications device  800  may further include other hardware components, which are not enumerated in this specification. 
     All or some of the foregoing embodiments may be implemented by using software, hardware, firmware, or any combination thereof. When software is used to implement the embodiments, the embodiments may be implemented completely or partially in a form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, the procedure or functions according to the embodiments of the present invention are all or partially generated. The computer may be a general-purpose computer, a dedicated computer, a computer network, or other programmable apparatuses. The computer instructions may be stored in a computer-readable storage medium or may be transmitted from a computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from a website, computer, server, or data center to another website, computer, server, or data center in a wired (for example, a coaxial cable, an optical fiber, or a digital subscriber line (DSL)) or wireless (for example, infrared, radio, or microwave) manner. The computer-readable storage medium may be any usable medium accessible by a computer, or a data storage device, such as a server or a data center, integrating one or more usable media. The usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, or a magnetic tape), an optical medium (for example, a DVD), a semiconductor medium (for example, a solid-state drive (SSD)), or the like. 
     To sum up, the foregoing descriptions are merely embodiments of the present invention, but are not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, or improvement made without departing from the spirit and principle of the present invention shall fall within the protection scope of the present invention.