Channel information reporting method, channel information receiving method, terminal, network side device, and medium

Abstract

The present application relates to the technical field of wireless communications, and discloses a channel information reporting method, a channel information receiving method, a terminal, a network side device, and a medium. The channel information reporting method of embodiments of the present application comprises: a terminal measures pilot signals in multiple configured pilot signal sets to obtain measurement results, wherein each pilot signal set corresponds to an antenna subarray of a network side device; the terminal selects a pilot signal from each pilot signal set; the terminal determines channel state information on the basis of the measurement result of the selected pilot signal; and the terminal reports the channel state information.

Description

Channel information reporting method, receiving method, terminal, network side equipment and medium

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202310928951.4 filed in China on July 26, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application belongs to the field of wireless communication technology, and specifically relates to a channel information reporting method, a receiving method, a terminal, a network-side device, and a medium. Background Art

[0004] New Radio (NR) systems support multiple types of channel state information (CSI), including Type I CSI feedback, Type II CSI feedback, and enhanced Type IICSI feedback, as well as beam information feedback. The number of base station transmit antennas can be 2, 4, 8, 16, or 32, and the corresponding codebooks are standardized in the protocol. The base station configures measurement pilot information (such as Channel State Information Reference Signal (CSI-RS)). The terminal (also known as User Equipment (UE)) performs channel measurement based on the configured measurement pilot (such as CSI-RS) and feeds back the corresponding CSI. For example, if the base station configures a 32-port CSI-RS and type I CSI, and the feedback type is periodic, the UE periodically measures the 32-port CSI-RS, generates the corresponding type I CSI, and then periodically feeds back the CSI. The base station can configure multiple CSI-RSs for the UE. When multiple CSI-RSs are configured, the CSI fed back by the UE also includes a CSI-RS Resource Indicator (CRI). That is, the UE indicates to the base station which CSI-RS the fed-back CSI is measured based on.

[0005] In the CSI feedback mechanism of the related technology, the basis of codebook design is the Discrete Fourier Transform (DFT) vector. The codebook design based on the DFT vector takes into account the terminal being a certain distance away from the base station. When the terminal is far away from the base station, the radio waves of the base station can be assumed to be parallel, that is, the distances from the signals emitted by the multiple antennas of the base station to the receiving antenna of the terminal can be considered equal. This is because the distances between the multiple antennas of the base station are relatively small (for example, half the wavelength of the wireless signal). Under ultra-large-scale antennas, for terminals in the near field (that is, the terminal is relatively close to the base station), for example, the distances from the signals emitted by the leftmost antenna and the rightmost antenna of the base station to the receiving antenna of the terminal are different. The codebook based on the DFT vector in the related technology is not optimal, and the performance of the codebook based on the DFT vector will be lost, and it is easy to produce near-field effects.

[0006] Summary of the Invention

[0007] The embodiments of the present application provide a channel information reporting method, a receiving method, a terminal, a network-side device, and a medium, which can solve the problem that the CSI feedback method cannot simultaneously support terminals in the near field and the far field.

[0008] In a first aspect, a channel information reporting method is provided, which is executed by a terminal. The method includes:

[0009] The terminal measures pilot signals in the configured multiple pilot signal sets to obtain measurement results, wherein each pilot signal set corresponds to an antenna subarray of the network side device;

[0010] The terminal selects a pilot signal from each of the pilot signal sets;

[0011] The terminal determines channel state information according to a measurement result of the selected pilot signal;

[0012] The terminal reports the channel state information.

[0013] In a second aspect, a method for receiving channel information is provided, which is performed by a network-side device. The method includes:

[0014] The network side device receives channel state information reported by the terminal, where the channel state information is determined by the terminal measuring pilot signals in multiple pilot signal sets and then selecting a pilot signal from each of the pilot signal sets based on the measurement results of the selected pilot signal, wherein each pilot signal set corresponds to an antenna subarray of the network side device.

[0015] According to a third aspect, a channel information reporting device is provided, comprising:

[0016] a measurement module, configured to measure pilot signals in a plurality of configured pilot signal sets to obtain measurement results, wherein each pilot signal set corresponds to an antenna subarray of a network-side device;

[0017] A first selection module, configured to select a pilot signal from each of the pilot signal sets;

[0018] A first determining module, configured to determine channel state information according to a measurement result of a selected pilot signal;

[0019] The first sending module is configured to report the channel state information.

[0020] In a fourth aspect, a channel information receiving device is provided, comprising:

[0021] A first receiving module is configured to receive channel state information reported by a terminal, where the channel state information is determined by the terminal measuring pilot signals in a plurality of configured pilot signal sets, selecting a pilot signal from each of the pilot signal sets, and determining the channel state information based on the measurement results of the selected pilot signal, wherein each pilot signal set corresponds to an antenna subarray of a network-side device.

[0022] In a fifth aspect, a terminal is provided, comprising a processor and a memory, wherein the memory stores a program or instruction that can be run on the processor, and when the program or instruction is executed by the processor, the steps of the method described in the first aspect are implemented.

[0023] In the sixth aspect, a terminal is provided, comprising a processor and a communication interface, wherein the processor is used to measure pilot signals in a plurality of configured pilot signal sets to obtain measurement results; select a pilot signal from each of the pilot signal sets; determine channel state information based on the measurement results of the selected pilot signal; wherein each of the pilot signal sets corresponds to an antenna subarray of a network side device; and the communication interface is used to report the channel state information.

[0024] In the seventh aspect, a network side device is provided, which includes a processor and a memory, wherein the memory stores programs or instructions that can be run on the processor, and when the program or instructions are executed by the processor, the steps of the method described in the second aspect are implemented.

[0025] In the eighth aspect, a network side device is provided, including a processor and a communication interface, wherein the communication interface is used to receive channel state information reported by the terminal, and the channel state information is determined by the terminal measuring the pilot signals in the configured multiple pilot signal sets and obtaining the measurement results, and then selecting a pilot signal from each of the pilot signal sets, and determining it based on the measurement results of the selected pilot signal, wherein each of the pilot signal sets corresponds to an antenna subarray of the network side device.

[0026] In the ninth aspect, a readable storage medium is provided, on which a program or instruction is stored. When the program or instruction is executed by a processor, the steps of the method described in the first aspect are implemented, or the steps of the method described in the second aspect are implemented.

[0027] In the tenth aspect, a wireless communication system is provided, comprising: a terminal and a network side device, wherein the terminal can be used to execute the steps of the method described in the first aspect, and the network side device can be used to execute the steps of the method described in the second aspect.

[0028] In the eleventh aspect, a chip is provided, which includes a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the method as described in the first aspect, or to implement the method as described in the second aspect.

[0029] In a twelfth aspect, a computer program / program product is provided, wherein the computer program / program product is stored in a storage medium and is executed by at least one processor to implement the steps of the method described in the first aspect or the second aspect.

[0030] In an embodiment of the present application, after measuring the pilot signals in the configured multiple pilot signal sets, the terminal selects a pilot signal from each pilot signal set to determine the channel state information, wherein each pilot signal set corresponds to an antenna subarray of the network side device, and a pilot signal is selected from each pilot signal set to determine the channel state information, that is, the distance between each antenna subarray and the terminal is taken into account, thereby avoiding the near-field effect of the terminal in the near field. This feedback method is applicable to terminals in both the near field and the far field, thereby improving system performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] FIG1 is a block diagram of a wireless communication system applicable to embodiments of the present application;

[0032] FIG2 is a flow chart of a method for reporting channel information according to an embodiment of the present application;

[0033] FIG3 is a flow chart of a method for receiving channel information according to an embodiment of the present application;

[0034] FIG4 is a schematic diagram of a large-scale antenna of a network-side device according to an embodiment of the present application;

[0035] FIG5 is a schematic structural diagram of a channel information reporting device according to an embodiment of the present application;

[0036] FIG6 is a schematic structural diagram of a channel information receiving device according to an embodiment of the present application;

[0037] FIG7 is a schematic structural diagram of a communication device according to an embodiment of the present application;

[0038] FIG8 is a schematic diagram of the hardware structure of a terminal according to an embodiment of the present application;

[0039] FIG9 is a schematic diagram of the hardware structure of the network side device according to an embodiment of the present application. DETAILED DESCRIPTION

[0040] The following will be combined with the accompanying drawings in the embodiments of this application to clearly describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of this application.

[0041] The terms "first", "second", etc. in this application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way are interchangeable where appropriate, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first" and "second" are generally of the same type, and do not limit the number of objects, for example, the first object can be one or more. In addition, "or" in this application represents at least one of the connected objects. For example, "A or B" covers three options, namely, Option 1: including A but not including B; Option 2: including B but not including A; Option 3: including both A and B. The character " / " generally indicates that the objects associated before and after are in an "or" relationship.

[0042] The term "indication" in this application can be either a direct indication (or explicit indication) or an indirect indication (or implicit indication). A direct indication can be understood as the sender explicitly informing the receiver of specific information, the operation to be performed, or the requested result, etc. in the instruction sent; an indirect indication can be understood as the receiver determining the corresponding information based on the instruction sent by the sender, or making a judgment and determining the operation to be performed or the requested result, etc. based on the judgment result.

[0043] It is worth noting that the technology described in the embodiments of the present application is not limited to the Long Term Evolution (LTE) / LTE-Advanced (LTE-A) system, but can also be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency-Division Multiple Access (SC-FDMA) or other systems. The terms "system" and "network" in the embodiments of the present application are often used interchangeably, and the technology described can be used for the systems and radio technologies mentioned above, as well as for other systems and radio technologies. The following description describes a New Radio (NR) system for illustrative purposes, and NR terminology is used in most of the following description, but these technologies can also be applied to systems other than NR systems, such as 6th generation (6G) systems. th Generation, 6G) communication system.

[0044] FIG1 is a block diagram of a wireless communication system applicable to an embodiment of the present application. The wireless communication system includes a terminal 11 and a network-side device 12. The terminal 11 may be a mobile phone, a tablet computer (Tablet Personal Computer), a laptop computer (Laptop Computer), a notebook computer, a personal digital assistant (PDA), a handheld computer, a netbook, an ultra-mobile personal computer (UMPC), a mobile internet device (MID), an augmented reality (AR), a virtual reality (VR) device, a robot, a wearable device (Wearable Device), an aircraft (Flight Vehicle), a vehicle-mounted device (VUE), a ship-mounted device, a pedestrian user equipment (PUE), a smart home (home appliances with wireless communication capabilities, such as refrigerators, televisions, washing machines, or furniture), a game console, a personal computer (PC), an ATM, or a self-service machine, or other terminal-side devices. Wearable devices include: smart watches, smart bracelets, smart headphones, smart glasses, smart jewelry (smart bracelets, smart bracelets, smart rings, smart necklaces, smart anklets, smart anklets, etc.), smart wristbands, smart clothing, etc. Among them, the vehicle-mounted device can also be called a vehicle-mounted terminal, a vehicle-mounted controller, a vehicle-mounted module, a vehicle-mounted component, a vehicle-mounted chip or a vehicle-mounted unit, etc. It should be noted that the specific type of the terminal 11 is not limited in the embodiment of the present application. The network side device 12 may include an access network device or a core network device, wherein the access network device may also be called a radio access network (Radio Access Network, RAN) device, a radio access network function or a radio access network unit. The access network device may include a base station, a wireless local area network (Wireless Local Area Network, WLAN) access point (Access Point, AS) or a wireless fidelity (Wireless Fidelity, WiFi) node, etc.Among them, the base station can be referred to as Node B (NB), Evolved Node B (eNB), the next generation Node B (gNB), New Radio Node B (NR Node B), access point, Relay Base Station (RBS), Serving Base Station (SBS), Base Transceiver Station (BTS), radio base station, radio transceiver, Basic Service Set (BSS), Extended Service Set (ESS), Home Node B (HNB), Home Evolved Node B (home evolved Node B), Transmission Reception Point (TRP) or other appropriate terms in the field. As long as the same technical effect is achieved, the base station is not limited to specific technical vocabulary. It should be noted that in the embodiment of the present application, only the base station in the NR system is used as an example for introduction, and the specific type of the base station is not limited.

[0045] The following, in conjunction with the accompanying drawings, describes in detail the channel information reporting method, receiving method, terminal, network-side device and medium provided in the embodiments of the present application through some embodiments and their application scenarios.

[0046] Referring to FIG. 2 , an embodiment of the present application provides a channel information reporting method, including:

[0047] Step 21: The terminal measures pilot signals in the configured multiple pilot signal sets to obtain measurement results, where each pilot signal set corresponds to an antenna subarray of the network-side device;

[0048] In this embodiment of the present application, a network device has multiple antenna subarrays. The network device configures multiple pilot signal sets for a terminal, each pilot signal set corresponding to an antenna subarray. Each pilot signal set includes one or more pilot signals, and the number of pilot signals in different pilot signal sets can be the same or different.

[0049] In the embodiment of the present application, the pilot signal may be a CSI-RS.

[0050] In the embodiment of the present application, the pilot signal set may be a pilot signal set used for channel measurement, or a pilot signal set used for beam training.

[0051] In the embodiment of the present application, the terminal may measure all pilot signals in the configured multiple pilot signal sets, or may measure part of the pilot signals in the pilot signal sets as needed.

[0052] Step 22: The terminal selects a pilot signal from each of the pilot signal sets;

[0053] Step 23: The terminal determines channel state information according to the measurement result of the selected pilot signal;

[0054] Step 24: The terminal reports the channel state information.

[0055] In an embodiment of the present application, after measuring the pilot signals in the configured multiple pilot signal sets, the terminal selects a pilot signal from each pilot signal set to determine the channel state information, wherein each pilot signal set corresponds to an antenna subarray of the network side device, and a pilot signal is selected from each pilot signal set to determine the channel state information, that is, the distance between each antenna subarray and the terminal is taken into account, thereby avoiding the near-field effect of the terminal in the near field. This feedback method is applicable to terminals in both the near field and the far field, thereby improving system performance.

[0056] In an embodiment of the present application, optionally, the method further includes: when each pilot signal set includes only one pilot signal, the terminal determines the channel state information based on the measurement results of some or all of the pilot signals in the pilot signal set, and reports the signal state information.

[0057] In the embodiment of the present application, optionally, each pilot signal set includes multiple pilot signals, and the terminal determines the channel state information according to the above steps 22 and 23, and reports the channel state information.

[0058] In some embodiments of the present application, optionally, the terminal selecting a pilot signal from each of the pilot signal sets includes: the terminal selecting a pilot signal from each of the pilot signal sets based on a first behavior, wherein the first behavior includes: selecting a pilot signal from each of the pilot signal sets based on a measurement result of the pilot signals in each of the pilot signal sets. The selecting a pilot signal from each of the pilot signal sets based on the measurement result of the pilot signals in each of the pilot signal sets may include: selecting a pilot signal from each of the pilot signal sets based on at least one of signal quality or signal strength of the pilot signals in each of the pilot signal sets.

[0059] In some embodiments of the present application, optionally, the terminal selects a pilot signal from each of the pilot signal sets, including: the terminal selects a pilot signal from each of the pilot signal sets based on a second behavior mode, and the second behavior mode includes: selecting a pilot signal sharing the same beam from each of the pilot signal sets.

[0060] In an embodiment of the present application, optionally, in different pilot signal sets, the indexes (also referred to as numbers or identifiers, etc.) of the pilot signals sharing the same beam are the same. That is, pilot signals with the same index are sent using the same beam, and pilot signals with different indexes are sent using different beams. For example, the network-side device configures four pilot signal sets for the terminal, and each pilot signal set includes eight pilot signals (indicated by three bits). Assuming that each pilot signal set has a pilot signal 000 with the same index, the four pilot signals 000 in the four pilot signal sets are sent using the same beam. The four pilot signals 000 in the four pilot signal sets are then selected to determine the channel state information.

[0061] In the embodiment of the present application, when the terminal selects the pilot signal based on the second behavior, the terminal may also only measure the pilot signals in the pilot signal set that share the same beam, without measuring other pilot signals in the pilot signal set.

[0062] In an embodiment of the present application, optionally, the signal information reporting method further includes: the terminal reporting indication information, the indication information being used to indicate whether the terminal selects a pilot signal from each of the pilot signal sets based on the first behavior mode or the second behavior mode. In an embodiment of the present application, the indication information can be either a direct indication (or an explicit indication) or an indirect indication (or an implicit indication). The direct indication can be understood as the terminal explicitly informing the receiving party in the indication information sent whether the terminal adopts the first behavior mode or the second behavior mode; the indirect indication can be understood as the receiving party determining whether the terminal adopts the first behavior mode or the second behavior mode based on the indication information sent by the terminal, or making a judgment and determining whether the terminal adopts the first behavior mode or the second behavior mode based on the judgment result.

[0063] In the embodiment of the present application, the indication information can be fed back to the network side device by the terminal alone, or it can be fed back to the network side device together with the channel state information.

[0064] In an embodiment of the present application, optionally, determining channel state information by the terminal based on measurement results of the selected pilot signals includes: determining, by the terminal, target pilot signals from the selected pilot signals, where the number of the target pilot signals is less than or equal to the number of the selected pilot signals; and determining the channel state information by the terminal based on the measurement results of the target pilot signals. In other words, the terminal may determine the channel state information by using all selected pilot signals as target pilot signals, or may select a portion of the selected pilot signals as target pilot signals to determine the channel state information.

[0065] In the embodiment of the present application, optionally, the terminal determining the target pilot signal from the selected pilot signal includes: the terminal determining the target pilot signal according to a measurement result (such as signal quality or signal strength) of the selected pilot signal.

[0066] In the embodiment of the present application, optionally, the channel information reporting method further includes: the terminal reporting the index of the target pilot signal.

[0067] In an embodiment of the present application, optionally, when the terminal selects a pilot signal from each of the pilot signal sets based on a first behavior, the terminal reports one or more indexes of the target pilot signal; the first behavior includes: selecting a pilot signal from each of the pilot signal sets based on measurement results of the pilot signals in each of the pilot signal sets. When the terminal selects one target pilot signal, the terminal reports one index of the target pilot signal; when the terminal selects multiple target pilot signals, the terminal reports multiple indexes of the target pilot signal.

[0068] In an embodiment of the present application, optionally, when the terminal selects a pilot signal from each of the pilot signal sets based on a second behavior mode, the index of the target pilot signal reported by the terminal is one; the second behavior mode includes: selecting a pilot signal sharing the same beam from each of the pilot signal sets.

[0069] That is, when the terminal selects a pilot signal from each of the pilot signal sets based on the second behavior, since the selected multiple pilot signals are pilot signals with the same index in different pilot signal sets, the terminal can report only one index. For example, the network-side device configures four pilot signal sets for the terminal, each pilot signal set including eight pilot signals (indicated by three bits). Assume that each pilot signal set has a pilot signal with the same index 000, and the four pilot signals 000 in the four pilot signal sets are transmitted using the same beam. The four pilot signals 000 in the four pilot signal sets are then selected for determining channel state information. In this case, the terminal can report a single index, 000, thereby saving overhead. Of course, in some embodiments, the terminal may also report multiple indexes, such as (000, 000, 000, 000).

[0070] In an embodiment of the present application, optionally, the channel status reporting method also includes: the terminal receives configuration information sent by the network side device, the configuration information includes configuration information of multiple pilot signal sets configured by the network side device for the terminal, and each of the pilot signal sets corresponds to an antenna subarray of the network side device.

[0071] Referring to FIG3 , an embodiment of the present application further provides a method for receiving channel information, including:

[0072] Step 31: The network-side device receives channel state information reported by the terminal, where the channel state information is determined by the terminal measuring the pilot signals in the configured multiple pilot signal sets and then selecting a pilot signal from each of the pilot signal sets based on the measurement results of the selected pilot signal, wherein each of the pilot signal sets corresponds to an antenna subarray of the network-side device.

[0073] In an embodiment of the present application, the network side device has multiple antenna subarrays, and the network side device configures multiple pilot signal sets for the terminal, and each pilot signal set corresponds to an antenna subarray.

[0074] In the embodiment of the present application, the pilot signal may be a CSI-RS.

[0075] In the embodiment of the present application, the pilot signal set may be a pilot signal set used for channel measurement, or a pilot signal set used for beam training.

[0076] In an embodiment of the present application, after measuring the pilot signals in the configured multiple pilot signal sets, the terminal selects a pilot signal from each pilot signal set to determine the channel state information, wherein each pilot signal set corresponds to an antenna subarray of the network side device, and a pilot signal is selected from each pilot signal set to determine the channel state information, that is, the distance between each antenna subarray and the terminal is taken into account, thereby avoiding the near-field effect of the terminal in the near field. This feedback method is applicable to terminals in both the near field and the far field, thereby improving system performance.

[0077] In an embodiment of the present application, optionally, the channel information receiving method further includes: the network side device sending configuration information to the terminal, the configuration information including configuration information of multiple pilot signal sets configured by the network side device for the terminal.

[0078] In the embodiment of the present application, optionally, each of the pilot signal sets includes one or more pilot signals, and the number of pilot signals in different pilot signal sets may be the same or different.

[0079] In an embodiment of the present application, optionally, in different pilot signal sets, the pilot signals sharing the same beam have the same index.

[0080] In an embodiment of the present application, optionally, the channel information receiving method further includes: the network side device receives indication information reported by the terminal, the indication information being used to indicate whether the terminal selects a pilot signal from each of the pilot signal sets based on a first behavior mode or a second behavior mode, wherein the first behavior mode includes: selecting a pilot signal from each of the pilot signal sets based on a measurement result of the pilot signal in each of the pilot signal sets; the second behavior mode includes: selecting a pilot signal sharing the same beam from each of the pilot signal sets.

[0081] In the embodiment of the present application, the indication information can be either a direct indication (or an explicit indication) or an indirect indication (or an implicit indication). A direct indication can be understood as the terminal explicitly informing the network side device in the indication information sent whether the terminal adopts the first behavior mode or the second behavior mode; an indirect indication can be understood as the network side device determining whether the terminal adopts the first behavior mode or the second behavior mode based on the indication information sent by the terminal, or making a judgment and determining whether the terminal adopts the first behavior mode or the second behavior mode based on the judgment result.

[0082] In the embodiment of the present application, optionally, the channel information receiving method further includes: the network side device receiving the index of the target pilot signal reported by the terminal.

[0083] In the embodiment of the present application, optionally, when the terminal selects a pilot signal from each of the pilot signal sets based on a first behavior, the index of the target pilot signal reported by the terminal is one or more; the first behavior includes: selecting a pilot signal from each of the pilot signal sets based on a measurement result of the pilot signal in each of the pilot signal sets;

[0084] In an embodiment of the present application, optionally, when the terminal selects a pilot signal from each of the pilot signal sets based on a second behavior mode, the index of the target pilot signal reported by the terminal is one; the second behavior mode includes: selecting a pilot signal sharing the same beam from each of the pilot signal sets.

[0085] In the above embodiments of the present application, the pilot signal set may also be referred to as a pilot signal subset, or a pilot signal resource set, or a pilot signal resource subset. The pilot signal set includes a pilot signal, which refers to a resource containing a pilot signal (CSI-RS resource).

[0086] In the above embodiments of the present application, the above signal state information may include at least one of: Rank Indication (RI), Precoding Matrix Indicator (PMI), and Channel Quality Indicator (CQI).

[0087] In the above embodiments of the present application, the channel state information (CSI) determined by the terminal based on the measurement result of the target pilot signal can be joint CSI, such as the coherent joint transmission (CJT) CSI in the current NR rel-18. Of course, other types of CSI can also be used.

[0088] The above method of the present application is illustrated below with examples in conjunction with specific application scenarios.

[0089] Example 1 of this application:

[0090] Please refer to Figure 4, which shows a schematic diagram of a massive antenna on a network device. The massive antenna on the network device can be divided into multiple antenna subarrays. In Figure 4, the massive antenna on the network device is divided into four antenna subarrays 40. The network device configures four pilot signal sets for the terminal, each corresponding to an antenna subarray 40. Each pilot signal set includes two pilot signals. This means that the network device transmits two pilot signals (using two different beams) from each antenna subarray 40.

[0091] The terminal measures the pilot signals in the configured four pilot signal sets to obtain measurement results, and selects a pilot signal from each pilot signal set based on a first behavior mode, where the first behavior mode includes: selecting a pilot signal from each pilot signal set according to the measurement results of the pilot signals in each pilot signal set, that is, selecting a total of four pilot signals, and feeding back the indexes of the four selected pilot signals to the network side device, and jointly calculating a CSI based on the selected four pilot signals and feeding back the CSI to the network side device.

[0092] Example 2 of this application:

[0093] In this embodiment, the network device's massive antenna is divided into four antenna subarrays. The network device configures four pilot signal sets for the terminal. Each pilot signal set corresponds to an antenna subarray, and each pilot signal set includes two pilot signals. This means that the network device transmits two pilot signals (using two different beams) from each antenna subarray.

[0094] The terminal measures the pilot signals in the four configured pilot signal sets, obtains measurement results, and selects a pilot signal from each pilot signal set based on a second behavior. The second behavior includes selecting a pilot signal from each pilot signal set that shares a common beam. That is, a single pilot signal is selected, and the index of the pilot signal is fed back to the network device. Based on the measurement results of the corresponding pilot signals in the four pilot signal sets, a CSI is calculated and fed back to the network device.

[0095] The channel information reporting method provided in the embodiment of the present application can be executed by a channel information reporting device. In the embodiment of the present application, the channel information reporting device performing the channel information reporting method is taken as an example to illustrate the channel information reporting device provided in the embodiment of the present application.

[0096] Referring to FIG. 5 , an embodiment of the present application provides a channel information reporting device 50, including:

[0097] a measurement module 51 configured to measure pilot signals in a plurality of configured pilot signal sets to obtain measurement results, wherein each pilot signal set corresponds to an antenna subarray of a network-side device;

[0098] A first selection module 52, configured to select a pilot signal from each of the pilot signal sets;

[0099] A first determining module 53 is configured to determine channel state information based on a measurement result of a selected pilot signal;

[0100] The first sending module 54 is configured to report the channel state information.

[0101] In an embodiment of the present application, after measuring the pilot signals in the configured multiple pilot signal sets, a pilot signal is selected from each pilot signal set to determine the channel state information, wherein each pilot signal set corresponds to an antenna subarray of the network side device, and a pilot signal is selected from each pilot signal set to determine the channel state information, that is, the distance between each antenna subarray and the terminal is taken into account, thereby avoiding the near-field effect of the terminal in the near field. This feedback method is applicable to terminals in both the near field and the far field, thereby improving system performance.

[0102] Optionally, each of the pilot signal sets includes multiple pilot signals.

[0103] Optionally, the first selection module 52 is configured to select a pilot signal from each of the pilot signal sets based on a first behavior, wherein the first behavior includes: selecting a pilot signal from each of the pilot signal sets based on a measurement result of the pilot signal in each of the pilot signal sets;

[0104] or

[0105] The first selection module 52 is configured to select a pilot signal from each of the pilot signal sets in a second behavior mode, wherein the second behavior mode includes selecting a pilot signal that shares a same beam from each of the pilot signal sets.

[0106] Optionally, in different pilot signal sets, the pilot signals sharing the same beam have the same index.

[0107] Optionally, the channel information reporting device 50 further includes:

[0108] The second sending module is configured to report indication information, where the indication information is used to indicate whether the terminal selects a pilot signal from each pilot signal set based on the first behavior mode or the second behavior mode.

[0109] Optionally, the first determination module 53 is configured to determine target pilot signals from the selected pilot signals, where the number of the target pilot signals is less than or equal to the number of the selected pilot signals; and determine channel state information based on measurement results of the target pilot signals.

[0110] Optionally, the channel information reporting device 50 further includes:

[0111] The third sending module is configured to report the index of the target pilot signal.

[0112] Optionally, when a pilot signal is selected from each of the pilot signal sets based on a first behavior, the index of the reported target pilot signal is one or more; the first behavior includes: selecting a pilot signal from each of the pilot signal sets based on a measurement result of the pilot signal in each of the pilot signal sets;

[0113] or

[0114] When a pilot signal is selected from each of the pilot signal sets based on the second behavior, the index of the reported target pilot signal is one; the second behavior includes: selecting a pilot signal sharing the same beam from each of the pilot signal sets.

[0115] Optionally, determining the target pilot signal from the selected pilot signals includes: determining the target pilot signal according to a measurement result of the selected pilot signal.

[0116] Optionally, the channel information reporting device 50 further includes:

[0117] A receiving module is used to receive configuration information sent by a network side device, where the configuration information includes configuration information of multiple pilot signal sets configured by the network side device for the terminal, and each pilot signal set corresponds to an antenna subarray of the network side device.

[0118] The channel information reporting device in the embodiments of the present application can be an electronic device, such as an electronic device with an operating system, or a component of an electronic device, such as an integrated circuit or chip. The electronic device can be a terminal or other device other than a terminal. For example, the terminal can include but is not limited to the types of terminal 11 listed above, and other devices can include servers, network attached storage (NAS), etc., which are not specifically limited in the embodiments of the present application.

[0119] The channel information reporting device provided in the embodiment of the present application can implement each process implemented in the method embodiment of Figure 2 and achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0120] The channel information receiving method provided in the embodiment of the present application can be executed by a channel information receiving device. In the embodiment of the present application, the channel information receiving device performing the channel information receiving method is taken as an example to illustrate the channel information receiving device provided in the embodiment of the present application.

[0121] Referring to FIG. 6 , an embodiment of the present application further provides a channel information receiving device 60, including:

[0122] The first receiving module 61 is used to receive channel state information reported by the terminal. The channel state information is determined by the terminal measuring the pilot signals in the configured multiple pilot signal sets and selecting a pilot signal from each of the pilot signal sets based on the measurement results of the selected pilot signal, wherein each pilot signal set corresponds to an antenna subarray of the network-side device.

[0123] In an embodiment of the present application, after measuring the pilot signals in the configured multiple pilot signal sets, the terminal selects a pilot signal from each pilot signal set to determine the channel state information, wherein each pilot signal set corresponds to an antenna subarray of the network side device, and a pilot signal is selected from each pilot signal set to determine the channel state information, that is, the distance between each antenna subarray and the terminal is taken into account, thereby avoiding the near-field effect of the terminal in the near field. This feedback method is applicable to terminals in both the near field and the far field, thereby improving system performance.

[0124] Optionally, the channel information receiving module 60 further includes:

[0125] The first sending module is configured to send configuration information to the terminal, where the configuration information includes configuration information of multiple pilot signal sets configured by the network side device for the terminal.

[0126] Optionally, each of the pilot signal sets includes one or more pilot signals.

[0127] Optionally, in different pilot signal sets, the pilot signals sharing the same beam have the same index.

[0128] Optionally, the channel information receiving module 60 further includes:

[0129] a second receiving module configured to receive indication information reported by the terminal, wherein the indication information is used to indicate whether the terminal selects a pilot signal from each pilot signal set based on the first behavior mode or the second behavior mode;

[0130] The first behavior includes: selecting a pilot signal from each pilot signal set according to the measurement results of the pilot signals in each pilot signal set; the second behavior includes: selecting a pilot signal sharing the same beam from each pilot signal set.

[0131] Optionally, the channel information receiving module 60 further includes:

[0132] The third receiving module is configured to receive the index of the target pilot signal reported by the terminal.

[0133] Optionally, when the terminal selects a pilot signal from each of the pilot signal sets based on a first behavior, the index of the target pilot signal reported by the terminal is one or more; the first behavior includes: selecting a pilot signal from each of the pilot signal sets based on a measurement result of the pilot signal in each of the pilot signal sets;

[0134] or

[0135] When the terminal selects a pilot signal from each of the pilot signal sets based on the second behavior, the index of the target pilot signal reported by the terminal is one; the second behavior includes: selecting a pilot signal sharing the same beam from each of the pilot signal sets.

[0136] The channel information receiving device in the embodiment of the present application can be an electronic device, such as an electronic device with an operating system, or a component in the electronic device, such as an integrated circuit or a chip.

[0137] The channel information receiving device provided in the embodiment of the present application can implement each process implemented in the method embodiment of Figure 3 and achieve the same technical effect. To avoid repetition, it will not be described here.

[0138] As shown in Figure 7, an embodiment of the present application further provides a communication device 70, including a processor 71 and a memory 72. The memory 72 stores a program or instruction that can be run on the processor 71. For example, when the communication device 70 is a terminal, the program or instruction, when executed by the processor 71, implements the various steps of the above-mentioned channel information reporting method embodiment and can achieve the same technical effect. When the communication device 70 is a network-side device, the program or instruction, when executed by the processor 71, implements the various steps of the above-mentioned channel information receiving method embodiment and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0139] The present application also provides a terminal including a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is configured to execute a program or instruction to implement the steps of the method embodiment shown in FIG2 . This terminal embodiment corresponds to the aforementioned terminal-side method embodiment, and each implementation process and implementation method of the aforementioned method embodiment is applicable to this terminal embodiment and can achieve the same technical effects. Specifically, FIG8 is a schematic diagram of the hardware structure of a terminal implementing an embodiment of the present application.

[0140] The terminal 80 includes but is not limited to: a radio frequency unit 81, a network module 82, an audio output unit 83, an input unit 84, a sensor 85, a display unit 86, a user input unit 87, an interface unit 88, a memory 89 and at least some of the components of the processor 810.

[0141] Those skilled in the art will appreciate that the terminal 80 may further include a power source (e.g., a battery) for powering various components. The power source may be logically connected to the processor 10 via a power management system, thereby enabling the power management system to manage charging, discharging, and power consumption. The terminal structure shown in FIG8 does not limit the terminal. The terminal may include more or fewer components than shown, or may combine certain components, or have different component arrangements, which will not be described in detail here.

[0142] It should be understood that in an embodiment of the present application, the input unit 84 may include a graphics processing unit (GPU) 841 and a microphone 842, and the graphics processor 841 processes the image data of a static picture or video obtained by an image capture device (such as a camera) in a video capture mode or an image capture mode. The display unit 86 may include a display panel 861, and the display panel 861 may be configured in the form of a liquid crystal display, an organic light emitting diode, etc. The user input unit 87 includes a touch panel 871 and at least one of other input devices 872. The touch panel 871 is also called a touch screen. The touch panel 871 may include two parts: a touch detection device and a touch controller. Other input devices 872 may include, but are not limited to, a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a trackball, a mouse, and a joystick, which will not be repeated here.

[0143] In the embodiment of the present application, after receiving downlink data from the network-side device, the radio frequency unit 81 can transmit the data to the processor 810 for processing. In addition, the radio frequency unit 81 can send uplink data to the network-side device. Generally, the radio frequency unit 81 includes but is not limited to an antenna, an amplifier, a transceiver, a coupler, a low-noise amplifier, a duplexer, etc.

[0144] The memory 89 can be used to store software programs or instructions and various data. The memory 89 may mainly include a first storage area for storing programs or instructions and a second storage area for storing data. The first storage area may store an operating system, applications or instructions required for at least one function (such as a sound playback function, an image playback function, etc.). In addition, the memory 89 may include a volatile memory or a non-volatile memory. The non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), a static random access memory (SRAM), a dynamic random access memory (DRAM), a synchronous dynamic random access memory (SDRAM), a double data rate synchronous dynamic random access memory (DDRSDRAM), an enhanced synchronous dynamic random access memory (ESDRAM), a synchronous link dynamic random access memory (SLDRAM), and a direct memory bus random access memory (DRRAM). The memory 89 in the embodiment of the present application includes but is not limited to these and any other suitable types of memory.

[0145] Processor 810 may include one or more processing units. Optionally, processor 810 integrates an application processor and a modem processor. The application processor primarily handles operations related to the operating system, user interface, and application programs, while the modem processor primarily processes wireless communication signals, such as a baseband processor. It is understood that the modem processor may not be integrated into processor 810.

[0146] The processor 810 is configured to measure pilot signals in a plurality of configured pilot signal sets to obtain measurement results; select a pilot signal from each of the pilot signal sets; and determine channel state information based on the measurement results of the selected pilot signals, wherein each of the pilot signal sets corresponds to an antenna subarray of a network-side device;

[0147] The radio frequency unit 81 is configured to report the channel state information.

[0148] In an embodiment of the present application, after measuring the pilot signals in the configured multiple pilot signal sets, the terminal selects a pilot signal from each pilot signal set to determine the channel state information, wherein each pilot signal set corresponds to an antenna subarray of the network side device, and a pilot signal is selected from each pilot signal set to determine the channel state information, that is, the distance between each antenna subarray and the terminal is taken into account, thereby avoiding the near-field effect of the terminal in the near field. This feedback method is applicable to terminals in both the near field and the far field, thereby improving system performance.

[0149] It can be understood that the implementation process of each implementation method mentioned in this embodiment can refer to the relevant description of the above-mentioned channel information reporting method embodiment, and achieve the same or corresponding technical effects. To avoid repetition, it will not be described here.

[0150] The present application also provides a network-side device, including a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is configured to execute a program or instruction to implement the steps of the method embodiment shown in FIG3 . This network-side device embodiment corresponds to the aforementioned network-side device method embodiment, and each implementation process and implementation method of the aforementioned method embodiment are applicable to this network-side device embodiment and can achieve the same technical effects.

[0151] Specifically, embodiments of the present application also provide a network-side device. As shown in Figure 9, the network-side device 90 includes an antenna 91, a radio frequency device 92, a baseband device 93, a processor 94, and a memory 95. Antenna 91 is connected to radio frequency device 92. In the uplink direction, radio frequency device 92 receives information via antenna 91 and sends the received information to baseband device 93 for processing. In the downlink direction, baseband device 93 processes the information to be transmitted and sends it to radio frequency device 92. Radio frequency device 92 processes the received information and then sends it through antenna 91.

[0152] The method executed by the network-side device in the above embodiment may be implemented in the baseband device 93 , which includes a baseband processor.

[0153] The baseband device 93 may include, for example, at least one baseband board, on which multiple chips are arranged, as shown in Figure 9, one of the chips is, for example, a baseband processor, which is connected to the memory 95 through a bus interface to call the program in the memory 95 and execute the network device operations shown in the above method embodiment.

[0154] The network side device may further include a network interface 96, which is, for example, a Common Public Radio Interface (CPRI).

[0155] Specifically, the network side device 90 of the embodiment of the present application also includes: instructions or programs stored in the memory 95 and can be run on the processor 94. The processor 94 calls the instructions or programs in the memory 95 to execute the method of execution of each module shown in Figure 6 and achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0156] An embodiment of the present application also provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, the various processes of the above-mentioned channel information reporting method embodiment are implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0157] An embodiment of the present application also provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, the various processes of the above-mentioned channel information receiving method embodiment are implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0158] The processor is the processor in the terminal described in the above embodiment. The readable storage medium includes a computer-readable storage medium, such as a computer read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk. In some examples, the readable storage medium may be a non-transitory readable storage medium.

[0159] An embodiment of the present application further provides a chip, which includes a processor and a communication interface, the communication interface and the processor are coupled, and the processor is used to run programs or instructions to implement the various processes of the above-mentioned channel information reporting method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0160] An embodiment of the present application further provides a chip, which includes a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the various processes of the above-mentioned channel information receiving method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0161] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0162] An embodiment of the present application further provides a computer program / program product, which is stored in a storage medium. The computer program / program product is executed by at least one processor to implement the various processes of the above-mentioned channel information reporting method embodiment and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0163] An embodiment of the present application further provides a computer program / program product, which is stored in a storage medium. The computer program / program product is executed by at least one processor to implement the various processes of the above-mentioned channel information receiving method embodiment and can achieve the same technical effect. To avoid repetition, it is not repeated here.

[0164] An embodiment of the present application further provides a communication system, including: a terminal and a network-side device, wherein the terminal can be used to execute the steps of the channel information reporting method described above, and the network-side device can be used to execute the steps of the channel information receiving method described above.

[0165] It should be noted that, in this article, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the opposite order according to the functions involved. For example, the described method may be performed in an order different from that described, and various steps may also be added, omitted or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0166] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of a computer software product plus a necessary general-purpose hardware platform, or of course, by hardware. The computer software product is stored in a storage medium (such as ROM, RAM, magnetic disk, optical disk, etc.) and includes a number of instructions for enabling a terminal or network-side device to execute the methods described in each embodiment of the present application.

[0167] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms of implementation methods without departing from the purpose of this application and the scope of protection of the claims. These implementation methods are all within the protection of this application.

Claims

1. A channel information reporting method, comprising: The terminal measures the pilot signals in the configured multiple pilot signal sets to obtain measurement results, wherein each of the pilot signal sets corresponds to an antenna subarray of the network side device; The terminal selects a pilot signal from each of the pilot signal sets; The terminal determines channel state information according to a measurement result of the selected pilot signal; The terminal reports the channel state information.

2. The method according to claim 1, wherein: Each of the pilot signal sets includes multiple pilot signals.

3. The method according to claim 1, wherein: The terminal selecting a pilot signal from each of the pilot signal sets comprises: The terminal selects a pilot signal from each of the pilot signal sets based on a first behavior, wherein the first behavior includes: selecting a pilot signal from each of the pilot signal sets according to a measurement result of the pilot signal in each of the pilot signal sets; or The terminal selects a pilot signal from each of the pilot signal sets based on a second behavior, where the second behavior includes: selecting a pilot signal that shares a same beam from each of the pilot signal sets.

4. The method according to claim 3, wherein: In different pilot signal sets, the indexes of pilot signals sharing the same beam are the same.

5. The method according to claim 3, further comprising: The terminal reports indication information, where the indication information is used to indicate whether the terminal selects a pilot signal from each of the pilot signal sets based on the first behavior mode or the second behavior mode.

6. The method according to claim 1, wherein: The terminal determining the channel state information according to the measurement result of the selected pilot signal includes: The terminal determines target pilot signals from the selected pilot signals, the number of the target pilot signals being less than or equal to the number of the selected pilot signals; The terminal determines channel state information according to a measurement result of the target pilot signal.

7. The method according to claim 6, further comprising: The terminal reports the index of the target pilot signal.

8. The method according to claim 7, wherein: When the terminal selects a pilot signal from each of the pilot signal sets based on a first behavior, the index of the target pilot signal reported by the terminal is one or more; the first behavior includes: selecting a pilot signal from each of the pilot signal sets according to a measurement result of the pilot signal in each of the pilot signal sets; or In the case where the terminal selects one pilot signal from each of the pilot signal sets based on the second behavior, The index of the target pilot signal reported by the terminal is one; the second behavior includes: selecting a pilot signal that shares the same beam from each of the pilot signal sets.

9. The method according to claim 5, wherein: The terminal determining the target pilot signal from the selected pilot signal comprises: The terminal determines a target pilot signal according to a measurement result of the selected pilot signal.

10. The method according to claim 1, further comprising: The terminal receives configuration information sent by a network side device, where the configuration information includes configuration information of multiple pilot signal sets configured by the network side device for the terminal, and each of the pilot signal sets corresponds to an antenna subarray of the network side device.

11. A method for receiving channel information, comprising: The network side device receives channel state information reported by the terminal, and the channel state information is determined by the terminal measuring the pilot signals in the configured multiple pilot signal sets to obtain measurement results, selecting a pilot signal from each of the pilot signal sets, and determining it according to the measurement results of the selected pilot signal, wherein each of the pilot signal sets corresponds to an antenna subarray of the network side device.

12. The method according to claim 11, further comprising: The network side device sends configuration information to the terminal, where the configuration information includes configuration information of multiple pilot signal sets configured by the network side device for the terminal.

13. The method according to claim 11 or 12, wherein: Each of the pilot signal sets includes one or more pilot signals.

14. The method according to claim 11 or 12, wherein: In different pilot signal sets, the indexes of pilot signals sharing the same beam are the same.

15. The method according to claim 11 or 12, further comprising: The network side device receives indication information reported by the terminal, where the indication information is used to indicate whether the terminal selects a pilot signal from each of the pilot signal sets based on a first behavior mode or a second behavior mode, The first behavior includes: selecting a pilot signal from each pilot signal set according to the measurement results of the pilot signals in each pilot signal set; the second behavior includes: selecting a pilot signal sharing the same beam from each pilot signal set.

16. The method according to claim 11, further comprising: The network side device receives the index of the target pilot signal reported by the terminal.

17. The method according to claim 16, wherein: When the terminal selects a pilot signal from each of the pilot signal sets based on a first behavior, the index of the target pilot signal reported by the terminal is one or more; the first behavior includes: selecting a pilot signal from each of the pilot signal sets according to a measurement result of the pilot signal in each of the pilot signal sets; or In the case where the terminal selects one pilot signal from each of the pilot signal sets based on the second behavior, The index of the target pilot signal reported by the terminal is one; the second behavior includes: selecting a pilot signal that shares the same beam from each of the pilot signal sets.

18. A channel information reporting device, comprising: A measurement module, configured to measure pilot signals in a plurality of configured pilot signal sets to obtain measurement results, wherein each of the pilot signal sets corresponds to an antenna subarray of a network side device; A first selection module, configured to select a pilot signal from each of the pilot signal sets; A first determination module, configured to determine channel state information according to a measurement result of a selected pilot signal; The first sending module is used to report the channel state information.

19. A channel information receiving device, comprising: The first receiving module is used to receive channel state information reported by the terminal, wherein the channel state information is determined by the terminal measuring the pilot signals in the configured multiple pilot signal sets to obtain measurement results, selecting a pilot signal from each of the pilot signal sets, and determining the channel state information based on the measurement results of the selected pilot signal, wherein each of the pilot signal sets corresponds to an antenna subarray of a network side device.

20. A terminal comprising a processor and a memory, wherein the memory stores a program or instruction that can be run on the processor, and when the program or instruction is executed by the processor, the steps of the channel information reporting method according to any one of claims 1 to 10 are implemented.

21. A network side device, comprising a processor and a memory, wherein the memory stores a program or instruction that can be run on the processor, and when the program or instruction is executed by the processor, the steps of the channel information receiving method according to any one of claims 11 to 17 are implemented.

22. A readable storage medium storing a program or instruction, wherein the program or instruction, when executed by a processor, implements the channel information reporting method as described in any one of claims 1 to 10, or implements the steps of the channel information receiving method as described in any one of claims 11 to 17.

Images