Terminal auxiliary calibration method, device and equipment, storage medium, communication system and chip system

Abstract

The invention relates to the technical field of communication, and discloses a terminal auxiliary calibration method, device and equipment, a storage medium, a communication system and a chip system. The method is applied to network equipment, and comprises the following steps: when multiple pieces of network equipment perform joint coherent transmission under a non-ideal backhaul, sending transmission configuration information of a reference signal to a calibration auxiliary terminal, receiving a measurement result reported by the calibration auxiliary terminal, and completing online calibration of an antenna based on the measurement result. According to the invention, a scheme that the terminal assists the network equipment in antenna calibration during joint coherent transmission of the plurality of network equipment under the non-ideal backhaul is provided, and the reliability of antenna calibration is improved.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a method, apparatus, device, storage medium, communication system and chip system for terminal-assisted calibration. Background Art

[0002] Time Domain Duplexing (TDD) systems have been widely used in wireless communication systems. In TDD systems, the uplink and downlink physical air interface channels have reciprocity within the channel coherence time, that is, the uplink channel estimate can be used as the downlink channel estimate, and vice versa. For example, in order to obtain uplink channel state information (CSI), the transmission and reception point (TRP) or the base station schedules the terminal to send a reference signal (e.g., sounding reference signal, SRS) on a certain time-frequency resource, and the TRP or the base station estimates the uplink channel using the received reference signal. Due to the reciprocity of the physical air interface channel, the downlink channel estimate can be obtained by the conjugate transpose of the uplink channel estimate.

[0003] Multiple Transmission Reception Points (M-TRPs) can greatly improve the throughput of the terminal and / or the reliability of the link. Figure 1 Taking the network architecture shown in Figure 1 as an example, joint transmission between M-TRPs (also called multi-TRPs) can improve the throughput of the terminal, and repeated transmission between M-TRPs can improve the reliability of the link. For joint transmission, it can be divided into two categories: non-coherent joint transmission (NCJT) and coherent joint transmission (CJT).

[0004] In coherent joint transmission (CJT), the transmitted data stream is jointly shaped by M-TRPs, and the beamforming precoding matrices of different TRPs are coordinated to ensure that the data stream is coherently superimposed at the receiving end. The precoding matrices of multiple TRPs are processed into a higher-dimensional antenna array to obtain higher shaping gain. CJT has high requirements for the backhaul and synchronization between TRPs. However, in actual commercial networks, the collaborative environment between M-TRPs is not always ideal and is easily affected by factors such as synchronous clock, inaccurate frequency offset estimation, Doppler frequency shift and path loss estimation. The reciprocity of uplink and downlink channels may also become unsatisfactory due to various reasons such as RF.

[0005] In actual situations, for non-ideal backhaul and multi-TRP joint transmission between stations in synchronous conditions, the existence of phase, delay, and frequency offset impairments between TRPs will greatly deteriorate the terminal throughput. Antenna calibration technology can compensate for the transmission function of the transmitting and receiving RF circuits and control the error within a limited range.

[0006] At present, some antenna calibration technologies have been disclosed, such as CN115699622A, which discloses a terminal-assisted antenna calibration solution in a multi-TRP scenario, which is aimed at the situation where there is an ideal backhaul between multiple TRPs; CN116132006A also discloses a solution for selecting at least one terminal from multiple terminals to assist network equipment in calibrating antennas through the measurement and transmission of pilot signals. However, for the scenario of joint transmission of multiple TRPs under non-ideal backhaul, an effective auxiliary calibration solution is still needed. Summary of the invention

[0007] The present application provides a method, apparatus, device, storage medium, communication system and chip system for terminal assisted calibration, which can provide an effective assisted calibration solution when multiple transmission and receiving points are jointly coherently transmitted under non-ideal backhaul.

[0008] In a first aspect, the present application provides a terminal-assisted calibration method, applied to a first network device, comprising:

[0009] Sending transmission configuration information of a reference signal to a calibration auxiliary terminal, wherein the reference signal is used for channel measurement when multiple network devices jointly transmit coherently under non-ideal backhaul, the multiple network devices include a first network device, and the transmission configuration information includes transmission port information and quasi co-location (QCL) information between the transmission ports;

[0010] sending a reference signal to a calibration auxiliary terminal;

[0011] Receiving a measurement result obtained based on a reference signal reported by a calibration auxiliary terminal;

[0012] Complete the online calibration of the antenna based on the measurement results.

[0013] Optionally, it also includes:

[0014] The first network device receives the measurement result via the air interface:

[0015] The measurement result is sent from the calibration auxiliary terminal or from the second network device, which is one or more of the plurality of network devices.

[0016] Optionally, the measurement result includes the calibration auxiliary information and identification information that identifies the attribution of the calibration auxiliary information. After the first network device receives the measurement result via the air interface, the following further includes:

[0017] Extract the calibration auxiliary information belonging to itself according to the identification information;

[0018] The measurement result is forwarded to a third network device, where the third network device is one or more of the plurality of network devices.

[0019] Optionally, the method further includes: the first network device receiving the measurement result via a physical uplink control channel (Physical Uplink Control Channel, PUCCH) or a physical uplink shared channel (Physical Uplink Control Channel, PUSCH);

[0020] Alternatively, the first network device extracts the measurement result from a Remote Interference Management Reference Signal (RIM-RS);

[0021] Alternatively, the first network device receives the measurement result from other air interface channels between the first network device and the plurality of network devices;

[0022] Alternatively, the first device receives the measurement result from other air interface channels with the calibration assistance terminal.

[0023] Optionally, the method further includes: the first network device acquiring a measurement result from a traditional PUCCH format; or,

[0024] The first network device obtains the measurement result from the new PUCCH format.

[0025] Optionally, the transmission configuration information also includes a network device identifier, which is carried in an enhanced CORESETPoolIndex, TRP ID or TAG ID field.

[0026] Optionally, the transmission port information and quasi co-location (QCL) information between the transmission ports include at least one of the following:

[0027] Among the multiple network devices, the calibration reference signal transmission port of each network device is configured in the same signal resource, and the transmission ports in the same signal resource are QCL;

[0028] Among the multiple network devices, the calibration reference signal transmission port of each network device is configured on the same signal resource, and different signal resources form a signal resource set; the transmission port in the same signal resource in the signal resource set is QCL, and the transmission ports in different signal resource sets are QCL or non-QCL;

[0029] or,

[0030] Multiple network devices are divided into S groups, where S is an integer greater than 0, and the calibration reference signal transmission ports of the network devices in each group are QCL, while the calibration reference signal transmission ports of the network devices between groups are not QCL.

[0031] Optionally, the transmission port information includes:

[0032] The calibration reference signal transmission ports of multiple network devices are configured on the same signal resource.

[0033] Optionally, the quasi co-location (QCL) information between the transmission ports includes:

[0034] The calibration reference signal transmission ports in the same signal resource are divided into L groups, where L is an integer greater than 0, and the transmission ports in the group are QCL; or,

[0035] There is a corresponding relationship between the network device identification and the QCL information, and the corresponding relationship is used to confirm the QCL relationship between the transmission ports.

[0036] Optionally, at least one of the following is also included:

[0037] The signal resources of different network devices are configured on different component carriers (CCs);

[0038] Signal resources of different network devices are configured on the same component carrier (CC);

[0039] The signal resources of different network devices are allocated on different bandwidth parts (Bandwidth Part, BWP);

[0040] or,

[0041] Signal resources of different network devices are allocated on the same bandwidth part (BWP).

[0042] In a second aspect, the present application provides another terminal-assisted calibration method, applied to a mobile terminal, comprising:

[0043] receiving transmission configuration information of a reference signal sent by a first network device, wherein the reference signal is used for channel measurement when multiple network devices jointly transmit coherently under a non-ideal backhaul, the multiple network devices include the first network device, and the transmission configuration information includes transmission port information and quasi co-location (QCL) information between the transmission ports;

[0044] receiving a reference signal sent by the first network device according to the transmission configuration information;

[0045] performing channel measurement based on the reference signal;

[0046] Report measurement results to multiple network devices.

[0047] Optionally, the mobile terminal reports the measurement result to the multiple network devices via at least one of the following methods:

[0048] reporting the measurement results to each of the plurality of network devices respectively;

[0049] or,

[0050] Add identification information to the calibration auxiliary information in the measurement result, where the identification information is used to identify the network device to which the calibration auxiliary information belongs, and report the measurement result to a fourth network device, which is one or more of the multiple network devices.

[0051] Optionally, it also includes: the mobile terminal reports the measurement result via a physical uplink control channel (Physical Uplink Control Channel, PUCCH) or a physical uplink shared channel (Physical Uplink Control Channel, PUSCH).

[0052] Optionally, the method further includes: the mobile terminal reporting the measurement result in a traditional PUCCH format;

[0053] or,

[0054] The mobile terminal reports the measurement results through the new PUCCH format.

[0055] Optionally, the identification information is carried in an enhanced CORESETPoolIndex and / or TRP ID field.

[0056] Optionally, the transmission port information and quasi co-location (QCL) information between the transmission ports include at least one of the following:

[0057] Among the multiple network devices, the calibration reference signal transmission port of each network device is configured in the same signal resource, and the transmission ports in the same signal resource are QCL;

[0058] Among the multiple network devices, the calibration reference signal transmission port of each network device is configured on the same signal resource, and different signal resources form a signal resource set; the transmission port in the same signal resource in the signal resource set is QCL, and the transmission ports in different signal resource sets are QCL or non-QCL;

[0059] or,

[0060] Multiple network devices are divided into S groups, where S is an integer greater than 0, and the calibration reference signal transmission ports of the network devices in each group are QCL, while the calibration reference signal transmission ports of the network devices between groups are not QCL.

[0061] Optionally, the transmission port information includes:

[0062] The calibration reference signal transmission ports of multiple network devices are configured on the same signal resource.

[0063] Optionally, the quasi co-location (QCL) information between the transmission ports includes:

[0064] The calibration reference signal transmission ports in the same signal resource are divided into L groups, where L is an integer greater than 0, and the transmission ports in the group are QCL; or,

[0065] The transmission configuration information also includes a network device identifier. There is a corresponding relationship between the network device identifier and the QCL information. The corresponding relationship is used to confirm the QCL relationship between the transmission ports.

[0066] Optionally, at least one of the following is also included:

[0067] The signal resources of different network devices are configured on different component carriers (CCs);

[0068] Signal resources of different network devices are configured on the same component carrier (CC);

[0069] The signal resources of different network devices are allocated on different bandwidth parts (Bandwidth Part, BWP);

[0070] or,

[0071] Signal resources of different network devices are allocated on the same bandwidth part (BWP).

[0072] In a third aspect, the present application provides a device for terminal assisted calibration, comprising:

[0073] A sending module, used for sending transmission configuration information of a reference signal to the calibration auxiliary terminal, where the reference signal is used for channel measurement when multiple network devices jointly transmit coherently under non-ideal backhaul, and the transmission configuration information includes transmission port information and Quasi Co-Located (QCL) information between transmission ports;

[0074] The sending module is also used to send a reference signal to the calibration auxiliary terminal;

[0075] A receiving module, used for receiving a measurement result obtained based on a reference signal and reported by a calibration auxiliary terminal;

[0076] The calibration module is used to complete the online calibration of the antenna according to the measurement results.

[0077] In a fourth aspect, an embodiment of the present application provides a device for assisting calibration, including:

[0078] A receiving module, configured to receive transmission configuration information of a reference signal sent by a network device, wherein the reference signal is used for channel measurement when multiple network devices jointly transmit coherently under non-ideal backhaul, and the transmission configuration information includes transmission port information and Quasi Co-Located (QCL) information between transmission ports;

[0079] The sending module is also used to receive a reference signal from the network device according to the transmission configuration information;

[0080] A measurement execution module: configured to perform channel measurement based on a reference signal;

[0081] The sending module is used to report the measurement results to multiple network devices.

[0082] In a fifth aspect, the present application provides a network device, comprising: a memory storing computer executable instructions; and also comprising: at least one processor coupled to the memory and configured to execute the computer executable instructions to perform the above method.

[0083] In a sixth aspect, the present application provides a terminal device, comprising: a memory storing computer executable instructions; and also comprising: at least one processor coupled to the memory and configured to execute the computer executable instructions to perform the above method.

[0084] In a seventh aspect, the present application provides a computer-readable storage medium, which, when instructions in the computer-readable storage medium are executed by a processor of a device, enables the device to perform any of the above methods.

[0085] In an eighth aspect, the present application provides a communication system comprising at least two of the aforementioned network devices and at least one of the aforementioned terminal devices.

[0086] In a ninth aspect, the present application provides a chip system, comprising: a communication interface for inputting and / or outputting information;

[0087] The processor is used to call and run a computer program through a communication interface so that a device equipped with a chip system executes the above method.

[0088] The present application sends the transmission port and quasi-co-site information of the calibration reference signal to the calibration auxiliary terminal, so that the calibration auxiliary terminal can still effectively assist multiple network devices in online calibration in the scenario of joint coherent transmission of multiple network devices with non-ideal backhaul, thereby improving the accuracy of joint coherent transmission of multiple network devices.

[0089] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or be understood by practicing the present application. The purpose and other advantages of the present application can be realized and obtained by the structures specifically pointed out in the written description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0090] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings introduced below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0091] Figure 1 A schematic diagram of a network architecture applicable to the terminal-assisted calibration method provided in an embodiment of the present application;

[0092] Figure 2 A schematic diagram of a flow chart of a terminal-assisted calibration method provided in an embodiment of the present application;

[0093] Figure 3 A schematic diagram of a flow chart of another terminal-assisted calibration method provided in an embodiment of the present application;

[0094] Figure 4 A schematic diagram of a flow chart of another terminal-assisted calibration method provided in an embodiment of the present application;

[0095] Figure 5 A schematic diagram of the structure of a calibration auxiliary device provided in an embodiment of the present application;

[0096] Figure 6 A schematic diagram of the structure of another calibration auxiliary device provided in an embodiment of the present application;

[0097] Figure 7 A schematic diagram of the internal structure of a network device provided in an embodiment of the present application;

[0098] Figure 8 A schematic diagram of the internal structure of a calibration auxiliary terminal provided in an embodiment of the present application;

[0099] Fig. 9 A schematic diagram of the structure of the chip system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0100] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Among them, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0101] Furthermore, in the description of the embodiments of the present application, unless otherwise specified, “ / ” means or. For example, A / B can mean A or B. The “and / or” in the text is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, “multiple” refers to two or more than two.

[0102] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as suggesting or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0103] Figure 1 A network architecture applicable to the calibration assistance method of the present application is shown. Those skilled in the art should understand that: Figure 1 The architecture is merely an example and does not limit the network architecture to which the embodiments of the present application are applicable. The embodiments of the present application can be used in any similar network architecture.

[0104] exist Figure 1In the network architecture composed of M-TRPs shown in FIG, K TRPs are connected to a centralized unit via K distributed units (DUs), and wireless connections are established with mobile terminals respectively. During the data flow with the mobile terminals, coherent joint transmission (CJT) is performed. Due to the RF parameter errors in the transceiver circuits and the time gap between the uplink and downlink channels, the channel reciprocity of the physical air interface becomes unsatisfactory. The TRPs participating in CJT first perform independent self-calibration. After self-calibration, due to the mismatch of the calibration circuit sending / receiving, accurate calibration cannot be achieved, so that the amplitude and phase errors between the antennas in each TRP are kept within a certain range, which is called the common reciprocity error. Since the common reciprocity errors between TRPs are different, if the common reciprocity errors between TRPs are not eliminated, the phase errors between TRPs will become unacceptable. Therefore, calibration between TRPs is crucial for CJT, especially for non-ideal backhaul. Air interface calibration is specifically for calibrating the common reciprocity errors between TRPs.

[0105] Figure 2 One of the flow diagrams of the terminal-assisted calibration method provided in the embodiment of the present application, the method can be applied to the first network device, such as Figure 2 As shown, the method comprises the following steps:

[0106] S101, sending transmission configuration information of a reference signal to a calibration auxiliary terminal;

[0107] In some embodiments, the reference signal is used for channel measurement when multiple network devices are jointly coherently transmitted under non-ideal backhaul. The terminal assists the joint coherent transmission network composed of two or more network devices to perform antenna calibration, wherein the backhaul network between the multiple network devices is non-ideal. The first network device may be one or more of the multiple network devices. In some embodiments, the transmission configuration information includes transmission port information and Quasi Co-Located (QCL) information between the transmission ports.

[0108] Quasi Co-location (QCL) between transmission ports: If the large-scale parameters of the channel experienced by the symbols on one antenna port can be inferred from the channel experienced by the symbols on the other antenna port, the two antenna ports are said to be QCL. The large-scale parameters include one or more of delay spread, Doppler spread, Doppler shift, average gain, average delay and spatial Rx parameters. There are 4 types of QCL: QCL Type A, Type B, Type C, Type D.

[0109] Taking the network device as TRP as an example, since different TRPs have different spatial positions, the large-scale channel characteristics corresponding to each TRP may have obvious differences. Therefore, when M-TRPs CJT is performed under non-ideal backhaul, it may be necessary to indicate the QCL information corresponding to each TRP to the calibration auxiliary terminal separately.

[0110] The reference signal can be any uplink or downlink calibration reference signal, for example, it can be a sounding reference signal (SRS) or a channel state information reference signal (CSI-RS), or it can be a synchronization signal block (SSB) or other reference signals. In some embodiments, the CSI-RS signal is preferably used. The CSI-RS is currently used for time / frequency tracking, CSI calculation, L1-RSRP measurement, L1-SINR measurement, mobility management (Radio Resource Management, RRM measurement), and fast SCell (Secondary Cell) activation tracking, and rate matching. The CSI-RS signal is used as an example in the subsequent embodiments of the present application, but the embodiments of the present application are not limited to this. Those skilled in the art can deduce the use of other reference signals based on the scheme introduced by the CSI-RS signal as an example. It should be understood that the deduced auxiliary calibration scheme using other reference signals is also within the scope of protection of the present application.

[0111] In some embodiments, the QCL information can be configured through the transmission configuration indication (TCI) state, and the TCI state is included in the downlink control information (DCI). Of course, the network device can also send the transmission configuration information in other ways, and the embodiments of the present application are not limited to this.

[0112] The network device can establish communication with multiple terminals and select a calibration auxiliary terminal from them (for example, based on the capabilities reported by the terminals). In some embodiments, the number of calibration auxiliary terminals is 1. In other embodiments, the number of calibration auxiliary terminals may also be two or more. Optionally, before determining the calibration auxiliary terminal, the network device first receives capability information reported by the terminal connected thereto, and selects an auxiliary terminal based on the terminal capabilities. Optionally, the network device may also select a calibration auxiliary terminal based on the operating status of the terminal, the channel occupancy status, and / or the power level of the terminal. In some embodiments, the network device may also negotiate with the terminal to determine the execution of the calibration auxiliary terminal.

[0113] Exemplarily, the reference signal used for auxiliary calibration can be named CSI-RS for calibration. The network device configures CSI-RS for calibration resources or resource sets for the calibration auxiliary terminal, wherein a maximum of Z (Z is an integer greater than or equal to 0) CSI-RS for calibration resources or resource sets can be configured for each calibration auxiliary terminal, and the value of Z can be determined by a combination of one or more of the following factors, such as the capability of the calibration auxiliary terminal, channel occupancy, channel quality and / or the number of calibration auxiliary terminals.

[0114] The resource or resource set corresponding to the CSI-RS for calibration is reflected by a transmission port, where the transmission port can be a logical port or a physical port. By including the transmission port information in the transmission configuration information, the network device can transmit the transmission port where the reference signal is located to the mobile terminal so that the mobile terminal can receive the reference signal more accurately.

[0115] The network device also indicates the QCL information between the CSI-RS for calibration transmission ports to the calibration auxiliary terminal, so that the calibration auxiliary terminal determines its large-scale parameters through the QCL relationship in the QCL information and performs corresponding physical layer operations.

[0116] There are multiple options for the specific configuration of QCL information. For the same network device, the transmission port configured in the reference signal resource has at least one of the following QCL types: QCL Type A, Type B, Type C, Type D. In some embodiments, the system configures a TCI state list for the calibration assistant terminal to indicate the transmission beam of the CSI-RS for calibration of each network device during M-TRPs CJT under non-ideal backhaul. In some embodiments, for a CJT network composed of K network devices, the specific configuration method of QCL information can be:

[0117] i. The transmission ports of CSI-RS for calibration from each network device belong to the same CSI-RS resource, and the CSI-RS for calibration transmission ports within the resource are QCL. The CSI-RS for calibration transmission ports between different CSI-RS resources can be QCL or non-QCL.

[0118] ii. Alternatively, the CSI-RS for calibration transmission ports from all network devices belong to the same CSI-RS resource, but the CSI-RS for calibration transmission ports in the same CSI-RS resource do not need to all be QCL. Further, in some embodiments:

[0119] a) Optionally, the CSI-RS for calibration transmission ports belonging to the same CSI-RS resource may be grouped, the transmission ports within the same group are QCL, and the transmission ports between different groups may not be QCL; or,

[0120] b) For the CSI-RS for calibration transmission ports in the same CSI-RS resource, the calibration assistant terminal identifies the transmission ports from different network devices in the following manner. Further, in some embodiments:

[0121] aa. While the system configures the CSI-RS for calibration of each network device for the calibration auxiliary terminal, it can also pre-bind the identification information of each network device (new network device ID or CORESETPoolIndex or timing advance group ID (TAG ID)) with the QCL information to establish a corresponding relationship between the identification information of the network device and the QCL information, and transmit the corresponding relationship to the calibration auxiliary terminal to help the calibration auxiliary terminal quickly and accurately identify specific QCL information. Therefore, there is a corresponding relationship between the identification information of the network device and the QCL information, so that the calibration auxiliary terminal determines the QCL information related to it according to the identification of the network device, obtains the QCL relationship between the transmission ports, and thus correctly receives and decodes the reference signal from the network device.

[0122] Further, in some embodiments, the QCL information is indicated based on the TCI state, each TCI state corresponds to a QCL relationship, there is a corresponding relationship between the identification information of the network device and the TCI state, and the QCL relationship between the transmission ports is indicated by the corresponding relationship:

[0123] 1. The network device ID can be added in RRC, MAC CE or DCI. For network device p: network device ID = p (p = 0, 1, .. K-1), TCI-StateId = q (q belongs to any integer value between 0 and maxNrofTCI-States-1), and p and q have a one-to-one explicit or implicit relationship. The transmission port of network device p complies with the QCL relationship indicated by the corresponding TCI state q.

[0124] 2. Or, for network device p: CORESETPoolIndex = p (p = 0, 1, .. K-1), TCI-StateId = q (q is any integer value between 0 and maxNrofTCI-States-1), and p and q have a one-to-one explicit or implicit relationship. The transmission port of network device p complies with the QCL relationship indicated by the corresponding TCI state q.

[0125] 3. Or, for network device p: TAG ID = p (p = 0, 1, .. K-1), TCI-StateId = q (q is any integer value between 0 and maxNrofTCI-States-1), and p and q have a one-to-one explicit or implicit relationship. The transmission port of network device p complies with the QCL relationship indicated by the corresponding TCI state q.

[0126] 4. Optionally, some network devices may be grouped and after grouping, they may be associated with one or some TCI status information q. By default, the network devices in the group comply with the QCL relationship specified by the associated q.

[0127] In some other embodiments, for K network devices, the specific configuration method of QCL information may also be:

[0128] iii. The CSI-RS for calibration transmission ports from each network device belong to the same CSI-RS resource, and different CSI-RS resources form a CSI-RS resource set. The transmission ports within the same CSI-RS resource in the CSI-RS resource set are QCL, and the transmission ports between different CSI-RS resources can be QCL or non-QCL.

[0129] iv. Alternatively, K network devices can be grouped into S groups, and the system configures independent QCL information for each group, with a total of S QCL information. The calibration reference signal transmission ports configured by the network devices in the group are QCL between each other, but not QCL between groups. Optionally, the basis for grouping is that the network devices in the group have similar large-scale channel characteristic relationships, and it can be assumed that their large-scale parameters are the same, so they can be divided into the same group.

[0130] v. Optionally, the CSI-RS for calibration of different network devices may be located on the same or different component carriers (CC) and / or bandwidth parts (BWP). That is, the configuration of the signal resources includes at least one of the following:

[0131] Signal resources of different network devices are allocated on different component carriers (CCs);

[0132] Signal resources of different network devices are configured on the same component carrier;

[0133] Signal resources of different network devices are allocated on different bandwidth parts (BWP);

[0134] or,

[0135] Signal resources of different network devices are allocated on the same bandwidth part (BWP).

[0136] S102, sending a reference signal to a calibration auxiliary terminal;

[0137] Taking CSI-RS as an example, in some embodiments, a new function design may be performed on CSI-RS to form CSI-RS for calibration.

[0138] Preferably, the network device sends a reference signal to the calibration auxiliary terminal according to the transmission configuration information, so that the calibration auxiliary terminal receives the reference signal according to the transmission configuration information (such as resource information, transmission port, etc.).

[0139] S103: Receive the measurement result based on the reference signal reported by the calibration auxiliary terminal

[0140] After the network device sends the transmission configuration information to the calibration auxiliary terminal, the calibration auxiliary terminal will perform measurements based on the reference signal according to the transmission configuration information. In some embodiments, the measurement parameters may include: one or more of the delay, phase, frequency offset, L1-RSRP, L1-SINR or other CSI information (including PMI, CQI, etc.) of each of the multiple network devices. The calibration auxiliary terminal calculates one or more of the calibration auxiliary information such as the delay difference, phase difference (or relative phase), frequency difference, timing / synchronization deviation, interference between network devices, downlink and / or uplink calibration corrections within the network device, etc. through the measurement parameters as part of the measurement results. The network device receives the measurement results reported by the calibration auxiliary terminal. Among them, the network device can receive the measurement results in multiple ways. In some embodiments, the network device receives the measurement results via the air interface. Optionally, the network device can receive it directly from the calibration auxiliary terminal via the air interface, or it can receive the forwarded measurement results from the second network device via the air interface. Among them, the second network device is one or more of the multiple network devices of the CJT (except the first network device).

[0141] Since the transmission reliability of the backhaul link is low in a non-ideal backhaul network, obtaining the measurement report via the air interface can improve the accuracy of the subsequent calibration process.

[0142] The measurement results reported by the calibration auxiliary terminal may include calibration auxiliary information belonging to multiple network devices. When the network device receives the measurement results, it can first extract the calibration auxiliary information related to itself, and then forward the measurement results to the third network device, wherein the third network device is one or more of the multiple network devices of CJT except the first network device. In some embodiments, the measurement results also include identification information that identifies the calibration auxiliary information, such as the network device ID. After the network device receives the measurement results, it extracts the calibration auxiliary information related to itself according to the identification information, and then forwards the measurement results to the third network device. In some embodiments, the network device can forward them together without distinction, so that each third network device receives the same data packet and parses its own corresponding data from the data packet; the measurement results can also be split according to the identification information and forwarded to the corresponding third network devices respectively, so that each other network device only receives the measurement results related to itself. In some embodiments, the number of third network devices is 1, that is, each network device forwards the measurement result only once after receiving it, and transmits the measurement result to all network devices in the CJT by forwarding step by step. Optionally, each network device can select the destination network device according to the principle of distance priority when forwarding, for example, give priority to forwarding to the network device closest to itself, or select the destination network device according to the principle of channel condition priority, for example, give priority to forwarding the network device to the channel with the best condition. In some embodiments, the number of third network devices can also be more than 1, that is, each network device forwards the measurement result to multiple network devices after receiving it, and can optionally forward it to all other network devices in the CJT except itself, or can forward it to all network devices in the CJT except itself and the source network device. Optionally, when a network device receives a measurement result that has been processed, it can independently choose whether to discard it.

[0143] The network device may receive the measurement result from any channel, and the embodiments of the present application do not limit this. In some embodiments, the network device may receive the measurement result from the Physical Uplink Control Channel (PUCCH) or the Physical Uplink Shared Channel (PUSCH); the measurement result may also be extracted from the Remote Interference Management Reference Signal (RIM-RS); and the measurement result may also be extracted or exchanged from other air interface channels between network devices.

[0144] Taking the network device receiving measurement results from PUCCH as an example, the results can be extracted from any traditional PUCCH format. The traditional PUCCH formats include PUCCH format 0, PUCCH format 1, PUCCH format 2, PUCCH format 3, and PUCCH format 4 specified in the current 3GPP specifications. For example, the measurement results are extracted from the PUCCH for CSI only part, or the HARQ-ACK / SR and CSI part in the traditional format. The measurement results can also be extracted from other parts of the traditional PUCCH. A new PUCCH format can also be designed, and the network device extracts the measurement results from the new PUCCH format. Among them, the new PUCCH format can be generated by the newly added fields of the traditional PUCCH format, or it can be independent of the traditional PUCCH, and the new PUCCH fields can be designed according to the needs of the specific scenario.

[0145] S104: Complete online calibration of the antenna according to the measurement result.

[0146] After receiving the measurement result, the network device completes the online calibration of the antenna based on the calibration auxiliary information in the measurement result.

[0147] The auxiliary calibration method provided in this embodiment can effectively reduce or even eliminate mismatch information such as phase, delay and frequency offset between various network devices, which is conducive to joint coherent transmission between various network devices.

[0148] Figure 2 The second flow chart of the antenna calibration method provided in the embodiment of the present application is applicable to a mobile terminal, for example, a calibration auxiliary terminal that assists a network device in performing calibration, such as Figure 2 As shown, the method comprises the following steps:

[0149] S201. Receive transmission configuration information of a reference signal sent by a first network device.

[0150] The calibration auxiliary terminal receives the transmission configuration information of the reference signal from the network device. Optionally, before this, each terminal can report its own capability information, busy / idle status, power status, etc. to the network device, so that the network device can determine at least one calibration auxiliary terminal from multiple terminals.

[0151] The calibration auxiliary terminal is in a network environment composed of multiple network devices, the network devices are in a joint coherent transmission (CJT) mode, and the backhaul network is non-ideal, and the first network device is one or more of the multiple network devices in the joint coherent transmission mode. The calibration auxiliary terminal assists the multiple network devices in calibration to reduce or eliminate mismatch information such as phase, delay and frequency deviation between them.

[0152] Optionally, in Figure 1 In the network architecture shown, the number of first network devices can be 1, that is, the calibration auxiliary terminal can receive the transmission configuration information of all network devices from 1 network device; the number of first network devices can be J (J is an integer greater than 1 and less than K), and the calibration auxiliary terminal receives the transmission configuration information of all K network devices from the J network devices; the number of first network devices can also be K, that is, the calibration auxiliary terminal can receive the transmission configuration information of each network device separately from each network device.

[0153] The transmission configuration information includes transmission port information and Quasi Co-Located (QCL) information between transmission ports, and its specific content is similar to that in the aforementioned embodiment and will not be repeated here.

[0154] S202: Receive a reference signal sent by the first network device according to the transmission configuration information

[0155] The calibration auxiliary terminal receives the reference signal sent by the network device according to the instruction in the transmission configuration information.

[0156] The type and transmission method of the reference signal are similar to those in the above-mentioned embodiment and will not be described in detail here.

[0157] S203: Perform channel measurement based on the reference signal

[0158] The calibration assistance terminal performs channel measurement based on the reference signal according to the transmission configuration information. In some embodiments, the measurement parameters may include: one or more of the delay, phase, frequency offset, L1-RSRP, L1-SINR or other CSI information (including PMI, CQI, etc.) of each of the multiple network devices. The calibration assistance terminal calculates one or more of the calibration assistance information such as the delay difference, phase difference (or relative phase), frequency difference, timing / synchronization deviation, interference between network devices, downlink and / or uplink calibration correction amount in the network device, etc. between the network devices through the measurement parameters as part of the measurement result.

[0159] S204: Reporting measurement results to multiple network devices

[0160] Optionally, the measurement result includes multiple calibration auxiliary information, and the calibration auxiliary terminal reports the calibration auxiliary information so that the network devices can coordinate or calibrate the relative deviation. Optionally, the network device can also calibrate its own downlink and / or uplink deviation based on the calibration auxiliary information. Optionally, the calibration auxiliary terminal can use the physical uplink control channel PUCCH or the physical uplink shared channel PUSCH for independent reporting or joint reporting.

[0161] The following takes the process of reporting measurement results by the calibration auxiliary terminal using PUCCH resources as an example, but the embodiments of the present application are not limited thereto.

[0162] The calibration auxiliary information can be sent in the traditional PUCCH format (i.e., PUCCH format 0, 1, 2, 3, 4), or a new PUCCH format can be designed and sent in the new PUCCH format. Optionally, for the traditional PUCCH format, it can be reported in the PUCCH for CSI only part, in the HARQ-ACK / SRand CSI part, or in any other part. For the new PUCCH format x, it can be used to specifically send calibration auxiliary information, or it can send calibration auxiliary information and other uplink control information (Uplink Control Information, UCI).

[0163] In some embodiments, the calibration assistant terminal reports the measurement results to multiple network devices in a joint reporting manner:

[0164] The calibration assistant terminal reports the calibration information sent to different network devices to the fourth network device using a PUCCH resource, and then the fourth network device forwards it to other network devices. The fourth network device is one or more of the multiple network devices of the CJT.

[0165] Optionally, the reported calibration auxiliary information includes identification information that identifies different network devices. The identification information may be one or more of a newly added network device ID, CORESETPoolIndex, or an existing network device ID. Optionally, the existing CORESETPoolIndex and / or network device ID may be enhanced. Currently, CORESETPoolIndex has only two values, and the network device ID has only 4 values. Optionally, the CORESETPoolIndex is enhanced, and the enhanced CORESETPoolIndex has M values ​​(M is greater than or equal to 2), and different values ​​correspond to different network devices. In some embodiments, the network device ID may also be enhanced, and the enhanced network device ID has N (N is greater than or equal to 4) values, and different values ​​correspond to different network devices. Optionally, a new network device ID field may be added to the PUCCH, for example, a new "TRPId" field may be added to the PUCCH-SpatialRelationInfo, as identification information that identifies different network devices. Optionally, the identification information of the network device may also be carried in other uplink signals or channels. Through the identification information, the network device can quickly identify its own auxiliary information from the reported measurement results after receiving the measurement results.

[0166] In some embodiments, the calibration auxiliary terminal can select a target network device as the fourth network device from multiple network devices according to the reporting rule, and send the measurement result to the target network device. The target device can be determined according to at least one of the location of the terminal, the channel quality, and the capability of the network device, or the target network device can be selected according to other factors. For example, the calibration auxiliary terminal can first send the measurement result to the network device closest to itself, and the network device forwards the measurement result to other network devices; the calibration auxiliary terminal can also first send the measurement result to the network device with the best channel quality, and then the network device forwards the measurement result to other network devices. The calibration auxiliary terminal can also select the target network device according to the weighted score of multiple aforementioned factors, for example, select the target network device according to the weighted score of the distance and the channel quality, and report the measurement result to the appropriate target network device and forward it. Optionally, after receiving the measurement result, the network device forwards the calibration auxiliary information belonging to other network devices to the corresponding network device according to the identification information in the measurement result, for example, forwarding the first calibration auxiliary information belonging to the A network device to the A network device, and forwarding the second calibration auxiliary information belonging to the B network device to the B network device.

[0167] In some embodiments, the calibration assistant terminal may also select two or more target network devices from multiple network devices as fourth network devices according to the reporting rule, and send the measurement results to the two or more target network devices, and the target network devices may send the measurement results to other network devices.

[0168] Optionally, since there is only a non-ideal backhaul between network devices, forwarding calibration auxiliary information using the non-ideal backhaul will affect the calibration effect, and therefore, the calibration auxiliary information between network devices is also transmitted via the air interface. Optionally, the calibration auxiliary information transmission between network devices can be transmitted by specially designed wireless signals or channels between network devices, or by using existing signals, such as adding calibration auxiliary information to a remote interference management reference signal (RIM-RS) for transmission.

[0169] In other embodiments, the calibration auxiliary terminal reports the measurement results to each network device in an independent reporting manner:

[0170] For independent reporting, the calibration assistance terminal sends the calibration assistance information sent to different network devices to the corresponding network devices respectively, that is, the calibration assistance terminal reports the measurement results to each of the multiple network devices of the CJT respectively, and each network device can directly receive its own calibration assistance information from the calibration assistance terminal. Optionally, the calibration assistance terminal uses multiple PUCCH and / or PUSCH resources for separate reporting. Assuming that the measurement results need to be reported to K network devices, the calibration assistance terminal can use K PUCCH resources to report to K network devices respectively, or use K PUSCH resources to report to K networks respectively, or use s PUCCH + n PUSCH resources for reporting (where s + n = K, and s>0, n>0).

[0171] Optionally, in order to ensure the quality and timeliness of PUCCH and / or PUSCH transmission, the calibration auxiliary terminal can be scheduled within and / or across time slots, in at least one of a variety of multiplexing methods such as time division, frequency division, code division, and space division, to report the calibration information to different network devices through different PUCCH and / or PUSCH resources.

[0172] Figure 4 is a schematic diagram of another embodiment of the present application, which shows a method flow of a terminal assisting at least two network devices to perform calibration, which can be used similar to Figure 1 It should be understood that this implementation is only exemplary, and the number of calibration auxiliary terminals and network devices, the method of sending transmission configuration information, and the method of reporting measurement results in this application are not limited to this.

[0173] Exemplarily, the calibration auxiliary terminal receives transmission configuration information issued by multiple network devices. Optionally, multiple network devices can send their own transmission configuration information to the calibration auxiliary terminal respectively, and the system can also concentrate the transmission configuration information about all K network devices to network device 1, and send it to the calibration terminal uniformly through network device 1. Optionally, the network device can select at least one from multiple terminals as a calibration auxiliary terminal based on at least one of multiple factors such as terminal capabilities, channel occupancy, channel quality, etc. Optionally, the terminal reports its own capabilities to the network device before the network device makes a selection. In some embodiments, the terminal may also periodically report its own capabilities, or report its own capabilities in response to a trigger instruction of the network device.

[0174] Multiple network devices send reference signals, such as CSI-RS for calibration or other reference signals, to the calibration auxiliary terminal respectively according to the set transmission configuration information. Optionally, the reference signals sent by multiple network devices can be the same or different. Optionally, multiple network devices can first negotiate the transmission gap of the reference signal, and send the reference signal to the calibration auxiliary terminal according to the negotiated measurement gap.

[0175] After receiving the transmission configuration information, the calibration auxiliary terminal receives the calibration reference signal according to the transmission configuration information, and uses the received reference signal to measure the calibration auxiliary information C_ij (where i, j = 1, 2…K, C_ij represents the calibration information required by the i-th network device for the j-th network device) composed of at least one of the delay difference, phase difference (or relative phase), frequency difference, timing deviation, synchronization deviation, interference between network devices, downlink within the network device, and uplink calibration correction amount within the network device.

[0176] The calibration auxiliary terminal puts the calibration auxiliary information C_ij into the measurement result and reports it to each network device. Optionally, the calibration auxiliary terminal can use independent reporting ( Figure 4 Solid line in the middle) or joint reporting ( Figure 4 The measurement results are reported in a manner as shown by the dashed line in the middle. Since the backhaul link is non-ideal, it is more reliable to report the measurement results via the air interface. Preferably, in a joint reporting manner, the calibration auxiliary terminal reports all measurement results to the network device 1, and the network device 1 forwards the measurement results to other network devices via the air interface.

[0177] In order to make the application scenarios of the embodiments of the present application clearer, this embodiment takes a calibration auxiliary terminal and a scenario including 4 non-ideal backhaul connection TRPs, that is, a cell with K=4 as an example to illustrate the solutions of some embodiments of the present application. Those skilled in the art should be aware that the number of calibration auxiliary terminals and network devices and the number of transmission ports are arbitrary, and the embodiments of the present application are not limited thereto. It can be easily expanded from the application scenario of one calibration terminal and K non-ideal backhaul connection TRPs to the scenario of multiple calibration terminals and multiple TRPs. The specific content and transmission method of the configuration information are exemplary, and the embodiments of the present application are not limited thereto.

[0178] A calibration auxiliary terminal is used between 4 TRPs. Figure 1 In the architecture shown, the four TRPs are numbered TRP 0, TRP 1, TRP 2 and TRP 3.

[0179] Step 1: The system configures the CSI-RS for calibration reference signal for the calibration auxiliary terminal, which is periodic, assuming that the period is 30 minutes (1800 seconds).

[0180] TRP 0 configures 2port CSI-RS for calibration transmission port through RRC. TRP 1, TRP2 and TRP3 also configure 2port CSI-RS for calibration transmission port through RRC.

[0181] The eight CSI-RS for calibration transmission ports from all four TRPs belong to the same CSI-RS resource. However, not all CSI-RS for calibration transmission ports in the same CSI-RS resource need to be QCL.

[0182] The system configures TRP ID=0 for TRP0, and configures TRP ID=1, 2, and 3 for TRP1, TRP2, and TRP3, respectively.

[0183] The system configures 2 TCI states to the calibration auxiliary terminal:

[0184] TCI-StateId = 0: The tracking reference signal (TRS) has QCLtype A;

[0185] TCI-StateId=1: The synchronization signal block (SSB) has QCL type D.

[0186] Assuming that TRP 0 and TRP 1 have similar large-scale channel characteristics, and TRP 2 and TRP 3 have similar large-scale channel characteristics, the system divides TRP ID=0 and TRP ID=1 into the first group and associates them with TCI-StateId=0; TRP ID=2 and TRP ID=3 are divided into the second group and associated with TCI-StateId=1.

[0187] According to the above configuration information, the calibration auxiliary terminal can know the QCL information of the CSI-RS for calibration transmission port in the same CSI-RS resource: that is, the 4 CSI-RS for calibration transmission ports from TRP 0 and TRP 1 are QCL, and have QCL type A with TRS; the 4 CSI-RS for calibration transmission ports from TRP 2 and TRP 3 are QCL, and have QCL type D with SSB.

[0188] Step 2: The calibration auxiliary terminal receives the CSI-RS for calibration reference signal according to the configuration information of the system in the first step, and measures one or more of the calibration auxiliary information such as the delay difference, phase difference (or relative phase), frequency difference, timing deviation, synchronization deviation, interference between TRPs, downlink within TRP, and uplink calibration correction within TRP based on the received reference signal. Let the obtained calibration auxiliary information be C_ij,i,j=0,1,2,3, where C_ij represents the calibration information required by the i-th TRP for the j-th TRP.

[0189] Step 3: The calibration terminal reports the calibration auxiliary information obtained in the second step to TRP 0, ..., TRP3 independently by time-division multiplexing 4 PUCCH resources in 4 slots, and selects to multiplex the CSI-only part of the existing PUCCH format 4 for reporting. The optional reporting information also includes the TRP identification mark TRP ID = 0, 1, 2, 3. The specific reporting information is:

[0190] Slot 0, PUCCH resource 0 contains the following information: TRP 0, C_00, C_01, C_02, C_03;

[0191] Slot 1, PUCCH resource 1 contains the following information: TRP 1, C_10, C_11, C_12, C_13;

[0192] Slot 2, PUCCH resource 2 contains the following information: TRP 2, C_20, C_21, C_22, C_23;

[0193] Slot 3, PUCCH resource 3 contains the following information: TRP 3, C_30, C_31, C_32, C_33.

[0194] Among them, the calibration process of each TRP is:

[0195] TRP 0 uses C_00, C_01, C_02, and C_03 to calibrate the delay difference, phase difference (or relative phase), frequency difference, timing / synchronization deviation, interference between TRPs, and downlink and / or uplink errors within TRP 0 between TRP 0 and TRP 1, 2, and 3;

[0196] TRP 1 uses C_10, C_11, C_12, and C_13 to calibrate the delay difference, phase difference (or relative phase), frequency difference, timing / synchronization deviation, interference between TRPs, and downlink and / or uplink errors within TRP 1 between TRP 1 and TRP 0, 2, and 3;

[0197] TRP 2 uses C_20, C_21, C_22, and C_23 to calibrate the delay difference, phase difference (or relative phase), frequency difference, timing / synchronization deviation, interference between TRPs, and downlink and / or uplink errors within TRP 2 between TRP 2 and TRP 1, 3, and 4;

[0198] TRP 3 uses C_30, C_31, C_32, and C_33 to calibrate the delay difference, phase difference (or relative phase), frequency difference, timing / synchronization deviation, interference between TRPs, and downlink and / or uplink errors within TRP 3 between TRP 3 and TRP 1, 2, and 4;

[0199] After the above calibration, TRP 0, 1, 2, 3 can perform joint coherent transmission to obtain shaping, precoding and / or multiplexing gain.

[0200] The embodiment of the present application also provides an auxiliary calibration device 500, Figure 5 is one of the schematic diagrams of the auxiliary calibration device, such as Figure 5 As shown, the device comprises:

[0201] The sending module 501 is used to send transmission configuration information of a reference signal to the calibration auxiliary terminal, wherein the reference signal is used for channel measurement when multiple network devices jointly transmit coherently under non-ideal backhaul, and the transmission configuration information includes transmission port information and quasi co-location (QCL) information between the transmission ports; and is also used to send the reference signal to the calibration auxiliary terminal;

[0202] A receiving module 502 is configured to receive a measurement result obtained based on a reference signal and reported by a calibration auxiliary terminal;

[0203] The calibration module 503 is used to complete the online calibration of the antenna based on the measurement result.

[0204] Optionally, the auxiliary calibration device 500 receives the measurement result via the air interface, and the measurement result is sent from the calibration auxiliary terminal or from the second network device, and the second network device is one or more of the multiple network devices. Optionally, the measurement result includes calibration auxiliary information and identification information for identifying the attribution of the calibration auxiliary information. Optionally, after receiving the measurement result via the air interface, the auxiliary calibration device 500 extracts the calibration auxiliary information belonging to itself; and forwards the measurement result to other network devices through the sending module 501.

[0205] Optionally, the auxiliary calibration device 500 receives the measurement result via a physical uplink control channel (PUCCH) and / or a physical uplink shared channel (PUSCH); or,

[0206] The auxiliary calibration device 500 extracts measurement results from a remote interference management reference signal (RIM-RS);

[0207] Alternatively, the auxiliary calibration device 500 extracts / exchanges measurement results from other air interface channels.

[0208] Optionally, the auxiliary calibration device 500 obtains the measurement result from a conventional PUCCH format; or,

[0209] Get measurement results from the new PUCCH format.

[0210] Optionally, the transmission configuration information also includes a network device identifier, which is carried in an enhanced CORESETPoolIndex, TRP ID or TAG ID field.

[0211] Optionally, the transmission port information and quasi co-location (QCL) information between the transmission ports include at least one of the following:

[0212] Among the multiple network devices, the calibration reference signal transmission port of each network device is configured in the same signal resource, and the transmission ports in the same signal resource are QCL;

[0213] Among the multiple network devices, the calibration reference signal transmission port of each network device is configured in the same signal resource, and different signal resources form a signal resource set; the transmission port in the same signal resource in the signal resource set is QCL, and the transmission port in different signal resources is QCL or non-QCL;

[0214] or,

[0215] Multiple network devices are divided into S groups, where S is an integer greater than 0, the calibration reference signal transmission ports configured by the network devices in each group are QCL, and the calibration reference signal transmission ports configured by the network devices between groups are not QCL.

[0216] Optionally, the transmission port information includes: the calibration reference signal transmission ports of all network devices are configured on the same signal resource.

[0217] Further optionally, the quasi co-location (QCL) information between the transmission ports includes:

[0218] The calibration reference signal transmission ports in the same signal resource are divided into L groups, where L is an integer greater than 0, and the transmission ports in the group are QCL; or,

[0219] There is a corresponding relationship between the network device identification and the QCL information, and the corresponding relationship is used to confirm the QCL relationship between the transmission ports.

[0220] Optionally, the configuration of the signal resource includes at least one of the following:

[0221] Signal resources of different network devices are allocated on different component carriers (CCs);

[0222] Signal resources of different network devices are configured on the same component carrier;

[0223] Signal resources of different network devices are allocated on different bandwidth parts (BWP);

[0224] or,

[0225] Signal resources of different network devices are allocated on the same bandwidth part (BWP).

[0226] The present application embodiment also provides another auxiliary calibration device 600, Figure 6 is one of the schematic diagrams of the auxiliary calibration device, such as Figure 6 As shown, the device comprises:

[0227] The receiving module 601 is configured to receive transmission configuration information of a reference signal sent by a first network device, wherein the reference signal is used for channel measurement when multiple network devices jointly transmit coherently under non-ideal backhaul, the multiple network devices include the first network device, and the transmission configuration information includes transmission port information and quasi co-location (QCL) information between the transmission ports; and further configured to receive the reference signal from the network device according to the transmission configuration information;

[0228] A measurement module 602, configured to perform channel measurement based on a reference signal;

[0229] The sending module 603 is used to report the measurement results to multiple network devices.

[0230] Optionally, the auxiliary calibration device 600 reports the measurement result via at least one of the following methods:

[0231] reporting the measurement results to each of the plurality of network devices respectively; or,

[0232] Identification information is added to different calibration auxiliary information in the measurement result, where the identification information is used to identify the network device to which the calibration auxiliary information belongs, and the measurement result is sent to a fourth network device, where the fourth network device is one or more of the multiple network devices.

[0233] Optionally, the auxiliary calibration device 600 sends the measurement result via a physical uplink control channel (PUCCH) and / or a physical uplink shared channel (PUSCH).

[0234] Further optionally, the auxiliary calibration device 600 sends the measurement result in a conventional PUCCH format; or,

[0235] The mobile terminal sends the measurement results via the new PUCCH format.

[0236] Optionally, the identification information is carried in an enhanced CORESETPoolIndex and / or TRP ID field.

[0237] Optionally, the transmission port information and quasi co-location (QCL) information between the transmission ports include at least one of the following:

[0238] Among the multiple network devices, the calibration reference signal transmission port of each network device is configured in the same signal resource, and the transmission ports in the same signal resource are QCL;

[0239] Among the multiple network devices, the calibration reference signal transmission port of each network device is configured in the same signal resource, and different signal resources form a signal resource set; ports in the same signal resource in the signal resource set are QCL, and transmission ports in different signal resources are QCL or non-QCL;

[0240] or,

[0241] Multiple network devices are divided into S groups, where S is an integer greater than 0, the calibration reference signal transmission ports configured by the network devices in each group are QCL, and the calibration reference signal transmission ports configured by the network devices between groups are not QCL.

[0242] Optionally, the transmission port information includes: the calibration reference signal transmission ports of all network devices are configured on the same signal resource.

[0243] Further optionally, the quasi co-location (QCL) information between the transmission ports includes:

[0244] The calibration reference signal transmission ports in the same signal resource are divided into L groups, where L is an integer greater than 0, and the transmission ports in the group are QCL; or,

[0245] There is a corresponding relationship between the network device identification and the QCL information, and the corresponding relationship is used to confirm the QCL relationship between the transmission ports.

[0246] Optionally, the configuration of the signal resource includes at least one of the following:

[0247] Signal resources of different network devices are allocated on different component carriers (CCs);

[0248] Signal resources of different network devices are configured on the same component carrier;

[0249] Signal resources of different network devices are allocated on different bandwidth parts (BWP);

[0250] or,

[0251] Signal resources of different network devices are allocated on the same bandwidth part (BWP).

[0252] It should be noted that the division of modules in the embodiments of the present application is schematic and is only a logical function division. There may be other division methods in actual implementation. In addition, each functional module in each embodiment of the present application may be integrated into a processing unit, or each module may exist physically separately, or two or more modules may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of a software functional unit.

[0253] The embodiment of the present application further provides a network device 700, Figure 7 One of the schematic diagrams of the network equipment is shown in FIG. Figure 7 As shown, the device includes a memory 702 storing computer executable instructions, a transceiver 704, a processor 701 and a bus interface 703; wherein the processor 701 and the memory 702 may also be physically separated. The processor is coupled to the memory and is configured to execute the computer executable instructions on the memory to perform the method in any embodiment of the present application.

[0254] The embodiment of the present application further provides a terminal 800, Figure 8 is one of the schematic diagrams of the terminal, such as Figure 8As shown, the device includes a memory 802 storing computer executable instructions, a transceiver 805, a processor 801, a bus interface 803 and a UI interface 904; wherein the processor 701 and the memory 702 may also be physically separated. The processor is coupled to the memory and is configured to execute the computer executable instructions on the memory to perform the method in any embodiment of the present application.

[0255] On the other hand, an embodiment of the present application further provides a computer-readable storage medium, which stores a computer program, and the computer program is used to enable a computer to execute the calibration method provided by the above embodiments.

[0256] On the other hand, an embodiment of the present application further provides a communication system, characterized in that it comprises at least two Figure 7 The network device shown and at least one Figure 8 The communication system can be implemented as follows. Figure 1 The network architecture connection shown may also be connected using other network architecture connections.

[0257] On the other hand, the embodiment of the present application further provides a chip system 900, Fig. 9 It is one of the schematic diagrams of the chip system, including: a communication interface 901, used for inputting and / or outputting information;

[0258] The processor 902 is used to call and run a computer program through a communication interface, so that a device equipped with the chip system executes the calibration method provided in the above embodiments.

[0259] The technical solution provided in the embodiment of the present application can be applicable to a variety of systems, especially 5G and 6G systems. For example, the applicable system can be a global system of mobile communication (GSM) system, a code division multiple access (CDMA) system, a wideband code division multiple access (WCDMA) general packet radio service (GPRS) system, a long term evolution (LTE) system, a LTE frequency division duplex (FDD) system, a LTE time division duplex (TDD) system, an advanced long term evolution (LTE-A) system, a universal mobile telecommunication system (UMTS), a world-wide interoperability for microwave access (WiMAX) system, a 5G new radio (NR) system, etc. These various systems include terminal equipment and network equipment. The system may also include core network parts, such as the Evolved Packet System (EPS), 5G System (5GS), etc.

[0260] The terminal involved in the embodiment of the present application may be a device that provides voice and / or data connectivity to a user, a handheld device with a wireless connection function, or other processing devices connected to a wireless modem. In different systems, the name of the terminal may also be different. For example, in a 5G system, the terminal may be called a user equipment (UE). A wireless terminal device can communicate with one or more core networks (CN) via a radio access network (RAN). The wireless terminal device may be a mobile terminal device, such as a mobile phone (or a "cellular" phone) and a computer with a mobile terminal device. For example, it may be a portable, pocket-sized, handheld, computer-built-in or vehicle-mounted mobile device that exchanges language and / or data with a wireless access network. For example, personal communication service (PCS) phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (PDAs) and other devices. The wireless terminal device may also be referred to as a system, a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, an access point, a remote terminal device, an access terminal device, a user terminal device, a user agent, and a user device, but is not limited in the embodiments of the present application.

[0261] The network device involved in the embodiments of the present application may be a transmission and receiving point (Transmission Reception Point, TRP), or a base station, which may include multiple cells providing services for the terminal. Depending on the specific application scenario, the base station may also be called an access point, or may be a device in the access network that communicates with the wireless terminal device through one or more sectors on the air interface, or other names. The network device may be used to interchange received air frames with Internet Protocol (Internet Protocol, IP) packets, and serve as a router between the wireless terminal device and the rest of the access network, wherein the rest of the access network may include an Internet Protocol (IP) communication network. The network device may also coordinate the attribute management of the air interface. For example, the network device involved in the embodiments of the present application may be a network device (Base Transceiver Station, BTS) in the Global System for Mobile communications (Global System for Mobile communications, GSM) or Code Division Multiple Access (Code Division Multiple Access, CDMA), or a network device (NodeB) in Wide-band Code Division Multiple Access (WCDMA), or an evolutionary network device (evolutional Node B, eNB or e-NodeB) in the long term evolution (long term evolution, LTE) system, a 5G base station (gNB) in the 5G network architecture (next generation system), or a home evolved Node B (Home evolved Node B, HeNB), a relay node, a home base station (femto), a pico base station (pico), etc., which is not limited in the embodiments of the present application. In some network structures, the network device may include a centralized unit (CU) node and a distributed unit (DU) node, and the centralized unit and the distributed unit may also be arranged geographically separately.

[0262] Network devices and terminal devices can each use one or more antennas for multiple-input multiple-output (MIMO) transmission. MIMO transmission can be single-user MIMO (SUMIMO) or multi-user MIMO (MU-MIMO). Depending on the form and number of antenna combinations, MIMO transmission can be 2D-MIMO, 3D-MIMO, FD-MIMO or massive-MIMO, or it can be diversity transmission, precoded transmission or beamforming transmission, etc.

[0263] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, devices, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0264] It is not difficult for those skilled in the art to understand that the technical features and technical means given in the various embodiments of the present application can be arbitrarily combined and / or superimposed without conflict, and the technical solutions generated after the combination and / or superposition are still within the protection scope intended by the present application.

[0265] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A terminal-assisted calibration method, applied to a first network device, characterized in that: The method comprises: Sending transmission configuration information of a reference signal to a calibration auxiliary terminal, wherein the reference signal is used for channel measurement when multiple network devices jointly transmit coherently under non-ideal backhaul, the multiple network devices include the first network device, and the transmission configuration information includes transmission port information and quasi co-location (Quasi Co-Located, QCL) information between the transmission ports; sending the reference signal to the calibration auxiliary terminal; receiving a measurement result obtained based on the reference signal and reported by the calibration auxiliary terminal; The online calibration of the antenna is completed according to the measurement result.

2. The method according to claim 1, characterized in that The method further comprises: The first network device receives the measurement result via an air interface; The measurement result is sent from the calibration auxiliary terminal or from a second network device, and the second network device is one or more of the multiple network devices.

3. The method according to claim 2, characterized in that The measurement result includes calibration auxiliary information and identification information to which the calibration auxiliary information belongs. After the first network device receives the measurement result via an air interface, the method further includes: The first network device extracts calibration auxiliary information belonging to itself according to the identification information; The measurement result is forwarded to a third network device, where the third network device is one or more of the plurality of network devices except the first network device and the second network device.

4. The method according to any one of claims 1 to 3, characterized in that: The method further includes: the first network device receiving the measurement result via a physical uplink control channel (Physical Uplink Control Channel, PUCCH) or a physical uplink shared channel (Physical Uplink Control Channel, PUSCH); Alternatively, the first network device extracts the measurement result from a Remote Interference Management Reference Signal (RIM-RS); Alternatively, the first network device receives the measurement result from other air interface channels between the first network device and the plurality of network devices; Alternatively, the first device receives the measurement result from another air interface channel with the calibration assistance terminal.

5. The method according to claim 4, characterized in that The method includes: the first network device obtains the measurement result from a traditional PUCCH format; or, The first network device obtains the measurement result from the new PUCCH format.

6. The method according to claim 5, characterized in that The transmission configuration information also includes a network device identifier, which is carried in an enhanced CORESETPoolIndex, TRP ID or TAG ID field.

7. The method according to any one of claims 1 to 3, characterized in that: The transmission port information and quasi co-location (QCL) information between the transmission ports include at least one of the following: Among the plurality of network devices, the calibration reference signal transmission port of each network device is configured in the same signal resource, and the transmission ports in the same signal resource are QCL; Among the multiple network devices, the calibration reference signal transmission port of each network device is configured on the same signal resource, and different signal resources form a signal resource set; the transmission port in the same signal resource in the signal resource set is QCL, and the transmission ports in different signal resource sets are QCL or non-QCL; or, The multiple network devices are divided into S groups, where S is an integer greater than 0, the calibration reference signal transmission ports of the network devices in each group are QCL, and the calibration reference signal transmission ports of the network devices between groups are not QCL.

8. The method according to claim 6, characterized in that The transmission port information includes: The calibration reference signal transmission ports of the plurality of network devices are configured on the same signal resource.

9. The method according to claim 8, characterized in that The quasi co-location (QCL) information between the transmission ports includes: The calibration reference signal transmission ports in the same signal resource are divided into L groups, where L is an integer greater than 0, and the transmission ports in the group are QCL; or, There is a corresponding relationship between the network device identification and the QCL information, and the corresponding relationship is used to confirm the QCL relationship between the transmission ports.

10. The method according to any one of claims 7 or 9, characterized in that: Also includes at least one of the following: The signal resources of different network devices are configured on different component carriers (CC); The signal resources of different network devices are configured on the same component carrier (CC); The signal resources of different network devices are configured on different bandwidth parts (Bandwidth Part, BWP); or, The signal resources of different network devices are allocated on the same bandwidth part (BWP).

11. A terminal-assisted calibration method, applied to a mobile terminal, characterized in that: The method comprises: Receiving transmission configuration information of a reference signal sent by a first network device, wherein the reference signal is used for channel measurement when multiple network devices jointly transmit coherently under non-ideal backhaul, the multiple network devices include the first network device, and the transmission configuration information includes transmission port information and quasi co-location (Quasi Co-Located, QCL) information between the transmission ports; receiving the reference signal sent by the first network device according to the transmission configuration information; performing channel measurement based on the reference signal; Report the measurement results to the multiple network devices.

12. The method according to claim 11, characterized in that The mobile terminal reports the measurement result to the multiple network devices via at least one of the following methods: Reporting the measurement result to each of the plurality of network devices respectively; or, Add identification information to the calibration auxiliary information in the measurement result, where the identification information is used to identify the network device to which the calibration auxiliary information belongs, and report the measurement result to a fourth network device, where the fourth network device is one or more of the multiple network devices.

13. The method according to claim 12, characterized in that The method further includes: the mobile terminal reporting the measurement result via a physical uplink control channel (Physical Uplink Control Channel, PUCCH) or a physical uplink shared channel (Physical Uplink Control Channel, PUSCH).

14. The method according to claim 13, characterized in that The method comprises: the mobile terminal reporting the measurement result through a traditional PUCCH format; or, The mobile terminal reports the measurement result through a new PUCCH format.

15. The method according to claim 14, characterized in that The identification information is carried in the enhanced CORESETPoolIndex and / or TRP ID field.

16. The method according to any one of claims 11-12, characterized in that: The transmission port information and quasi co-location (QCL) information between the transmission ports include at least one of the following: Among the plurality of network devices, the calibration reference signal transmission port of each network device is configured in the same signal resource, and the transmission ports in the same signal resource are QCL; Among the multiple network devices, the calibration reference signal transmission port of each network device is configured on the same signal resource, and different signal resources form a signal resource set; the transmission port in the same signal resource in the signal resource set is QCL, and the transmission ports in different signal resource sets are QCL or non-QCL; or, The multiple network devices are divided into S groups, where S is an integer greater than 0, the calibration reference signal transmission ports of the network devices in each group are QCL, and the calibration reference signal transmission ports of the network devices between groups are not QCL.

17. The method according to any one of claims 11-12, characterized in that: The transmission port information includes: The calibration reference signal transmission ports of the plurality of network devices are configured on the same signal resource.

18. The method according to claim 17, characterized in that The quasi co-location (QCL) information between the transmission ports includes: The calibration reference signal transmission ports in the same signal resource are divided into L groups, where L is an integer greater than 0, and the transmission ports in the group are QCL; or, The transmission configuration information also includes a network device identifier. There is a corresponding relationship between the network device identifier and the QCL information. The corresponding relationship is used to confirm the QCL relationship between the transmission ports.

19. The method according to any one of claims 16 or 18, characterized in that: Also includes at least one of the following: The signal resources of different network devices are configured on different component carriers (CC); The signal resources of different network devices are configured on the same component carrier (CC); The signal resources of different network devices are configured on different bandwidth parts (Bandwidth Part, BWP); or, The signal resources of different network devices are allocated on the same bandwidth part (BWP).

20. A device for terminal assisted calibration, characterized in that: The device comprises: A sending module, used to send transmission configuration information of a reference signal to the calibration auxiliary terminal, wherein the reference signal is used for channel measurement when multiple network devices jointly transmit coherently under non-ideal backhaul, and the transmission configuration information includes transmission port information and Quasi Co-Located (QCL) information between the transmission ports; The sending module is further used to send the reference signal to the calibration auxiliary terminal; A receiving module, configured to receive a measurement result obtained based on the reference signal and reported by the calibration auxiliary terminal; The calibration module is used to complete the online calibration of the antenna according to the measurement result.

21. A device for terminal assisted calibration, characterized in that: The device comprises: A receiving module, configured to receive transmission configuration information of a reference signal sent by a network device, wherein the reference signal is used for channel measurement when multiple network devices jointly transmit coherently under non-ideal backhaul, and the transmission configuration information includes transmission port information and quasi co-location (QCL) information between transmission ports; The sending module is further used to receive the reference signal from the network device according to the transmission configuration information; A measurement execution module: configured to perform channel measurement based on the reference signal; A sending module is used to report the measurement result to the multiple network devices.

22. A network device comprising: A memory storing computer executable instructions; wherein the network device further comprises: At least one processor coupled to the memory and configured to execute the computer executable instructions to perform the method of claims 1-10.

23. A terminal device, comprising: A memory storing computer executable instructions; wherein the terminal device further comprises: At least one processor coupled to the memory and configured to execute the computer executable instructions to perform the method of claims 11-19.

24. A computer-readable storage medium, characterized in that: When the instructions in the computer-readable storage medium are executed by a processor of a device, the device is enabled to perform the method according to any one of claims 1-10 or 11-19.

25. A communication system, characterized in that: Includes at least two network devices as claimed in claim 22 and at least one terminal device as claimed in claim 23.

26. A chip system, characterized in that: include: A communication interface for inputting and / or outputting information; A processor is used to call and run a computer program through the communication interface so that a device equipped with the chip system executes the method described in any one of claims 1-10 or 11-19.

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