Wireless access point (AP) cooperation set construction method and device, equipment and medium

Abstract

The invention provides a wireless access point (AP) cooperation set construction method and device, equipment and a medium. The method applied to a network element comprises the following steps: determining an initial candidate AP set corresponding to a terminal; sending first indication information to the APs in the candidate AP set, wherein the first indication information is used for indicating the APs to perform a time-frequency synchronization process and / or an air interface calibration process; obtaining result information of a process corresponding to the first indication information executed by the AP; selecting an AP of which the corresponding result information meets a first set condition from the initial candidate AP set, and a target AP cooperation set of the terminal; and when it is monitored that the load information of any AP in the target AP cooperation set does not meet a second set condition, updating the target AP cooperation set. When the target AP cooperation set constructed by the embodiment of the invention is adopted to transmit data to the terminal, the data between the APs cannot interfere with each other, and the data transmission efficiency can be improved.

Description

Technical Field

[0001] The present invention relates to the field of wireless technology, and in particular to a method, device, equipment and medium for constructing a wireless access point (AP) collaboration set. Background Art

[0002] Cell-free Multiple-Input Multiple-Output (MIMO) is considered to be one of the potential technical network architectures for the 6th Generation Mobile Communications (6G). Through the distributed deployment and collaboration of a large number of wireless access points (APs), the poor points at the edge of the cellular cell and the interference between cells are eliminated. In a cell-free network, the UE must first select a main AP, and then select multiple APs to form an AP collaboration set to serve the UE.

[0003] The existing AP set construction scheme without cellular MIMO generally considers avoiding pilot pollution, and uses the K-means clustering algorithm to divide users into multiple clusters. The number of users included in each cluster does not exceed the number of orthogonal pilots, and APs are allocated to each cluster according to the derived formula based on the large-scale fading factor; another scheme is to reduce pilot pollution by reducing pilot reuse in the same area to obtain a pilot allocation scheme, and combine AP selection and pilot allocation schemes, and output the optimal joint pilot allocation and AP selection scheme through iteration. For the pilot allocation problem.

[0004] However, the existing method for constructing a cooperative set of APs without a cellular network does not consider the antenna synchronization and calibration quality issues between APs, so there are the following potential problems:

[0005] When the selected AP antennas are not synchronized, data from different APs may cancel each other out or cause interference when reaching the terminal;

[0006] When the selected AP antenna is poorly calibrated, coherent transmission will not be possible, resulting in reduced spectrum efficiency. Summary of the invention

[0007] The purpose of the present invention is to provide a method, device, equipment and medium for constructing a wireless access point (AP) cooperation set, which is used to solve the problems of low data transmission efficiency and mutual interference between data between different APs when APs in the AP cooperation set transmit data to terminals in the prior art.

[0008] In order to solve the above technical problems, an embodiment of the present invention provides a method for constructing a wireless access point AP cooperation set, which is applied to a network element and includes:

[0009] Determine an initial candidate AP set corresponding to the terminal;

[0010] Sending first indication information to an AP in the initial candidate AP set, where the first indication information is used to instruct the AP to perform a time-frequency synchronization process and / or an air interface calibration process;

[0011] Obtaining result information of a process corresponding to the first indication information executed by the AP;

[0012] Selecting an AP whose corresponding result information satisfies a first set condition from the initial candidate AP set, and establishing a target AP cooperation set for the terminal;

[0013] When it is monitored that the load information of any of the APs in the target AP cooperation set does not satisfy the second set condition, the target AP cooperation set is updated.

[0014] Optionally, the method further comprises:

[0015] When a third set condition is detected, reconstructing the target AP cooperation set;

[0016] Wherein, the third setting condition includes:

[0017] The signal quality of the reference signal of the first AP in the target AP cooperation set measured by the terminal is less than a first threshold;

[0018] A performance parameter of a second AP in the target AP cooperation set measured by the terminal is less than a second threshold.

[0019] Optionally, the reconstruction operation includes one or more of the following:

[0020] Deleting the first AP;

[0021] Deleting the second AP;

[0022] Adding a third AP whose reference signal quality is greater than the first threshold to the target AP cooperation set;

[0023] A fourth AP having a performance parameter greater than the second threshold is added to the target AP cooperation set.

[0024] Optionally, the result information corresponding to the time-frequency synchronization process includes time-frequency parameters, and the time-frequency parameters include a sending time when the first indication information is sent, an arrival time when the first indication information is transmitted to the antenna port of the AP, a first phase when the first indication information is sent, and a second phase when the first indication information is transmitted to the antenna port of the AP;

[0025] The result information corresponding to the air interface calibration process includes air interface calibration parameters, and the air interface calibration parameters include one or more of phase, amplitude and delay;

[0026] The first setting condition includes one or more of the following:

[0027] The time difference between the sending time and the arrival time in the time-frequency parameter is less than a third threshold;

[0028] A phase difference between the first phase and the second phase is less than a fourth threshold;

[0029] The parameters in the air interface calibration parameters meet the preset requirements.

[0030] Optionally, obtaining result information of a process corresponding to the first indication information executed by the AP, the method further includes:

[0031] Receiving initial time-frequency information sent by the plurality of APs according to the first indication information, the initial time-frequency information including identification information of corresponding APs and the initial time-frequency parameters;

[0032] According to the initial time-frequency parameters, respectively obtain a time-frequency synchronization strategy for each of the APs, wherein the time-frequency synchronization strategy is used to adjust the time-frequency parameters;

[0033] Sending the corresponding time-frequency synchronization strategy to the AP according to the identification information of the AP;

[0034] Obtain result information of the AP executing the time-frequency synchronization strategy.

[0035] Optionally, the time-frequency synchronization strategy includes a time adjustment value and a phase adjustment value;

[0036] The obtaining, according to the initial time-frequency parameters, a time-frequency synchronization strategy of each AP, comprises:

[0037] Obtaining a time difference for each of the APs according to the sending time and the arrival time in the initial time-frequency parameters;

[0038] Obtaining middle values ​​of a plurality of the time differences in descending order of the time differences;

[0039] Obtaining the time adjustment value of each of the APs according to the time difference corresponding to each of the APs and the middle value of the time difference;

[0040] Obtaining a phase difference of each of the APs according to the first phase and the second phase in the initial time-frequency parameters;

[0041] Obtaining a plurality of intermediate values ​​of the phase differences in descending order of the phase differences;

[0042] The phase adjustment value of each AP is obtained according to the phase difference corresponding to each AP and the intermediate value of the phase difference.

[0043] Optionally, the method further comprises:

[0044] When the number of APs in the initial candidate AP set is greater than a first threshold, dividing the APs in the initial candidate AP set into a plurality of AP groups, each of the AP groups including a reference AP and at least one fifth AP;

[0045] Wherein, when the first indication information is used to instruct the AP to perform a time-frequency synchronization process, the first indication information includes intra-group indication information and inter-group indication information, the intra-group indication information is used to instruct the reference AP and the fifth AP in each of the AP groups to perform a time-frequency synchronization process, and the inter-group indication information is used to instruct the reference APs between the multiple AP groups to perform a time-frequency synchronization process;

[0046] The sending first indication information to the APs in the initial candidate AP set includes:

[0047] The intra-group indication information and the inter-group indication information are sequentially sent to the APs in the initial candidate AP set, or the inter-group indication information and the intra-group indication information are sequentially sent to the APs in the initial candidate AP set.

[0048] Optionally, the second set condition includes that a load value indicated in the load information is less than a sixth threshold.

[0049] Optionally, when it is monitored that the load information of any AP in the target AP cooperation set does not satisfy a second set condition, updating the target AP cooperation set includes:

[0050] In the case where it is monitored that the load information of at least one of the APs does not satisfy the second set condition, determining the AP that does not satisfy the second set condition as an AP to be adjusted;

[0051] According to the service priority of the terminal corresponding to the target AP cooperation set, the AP to be adjusted is adjusted to update the target AP cooperation set;

[0052] The adjustment operation includes one or more of the following:

[0053] Deleting the AP to be adjusted from at least one of the target AP cooperation sets;

[0054] The AP to be adjusted is deleted from at least one of the target AP cooperation sets and the AP to be adjusted is added to another one or more of the target AP cooperation sets.

[0055] Optionally, the method further comprises:

[0056] Sending a signal conflict check request to each of the plurality of APs in the target AP cooperation set, wherein the signal conflict check request carries a first reference signal allocated to the terminal by a pre-configured master AP;

[0057] receiving a signal conflict check response sent by the AP, where the signal conflict check response includes a conflict status between a reference signal respectively allocated by each of the APs to the terminal and the first reference signal;

[0058] According to the conflict status, the AP that conflicts with the first reference signal is deleted from the target AP cooperation set, and the target AP cooperation set is updated.

[0059] Optionally, determining an initial candidate AP set corresponding to the terminal includes:

[0060] Acquiring a service request of the terminal, wherein the service request includes a service demand and / or behavior characteristics of a user;

[0061] An initial candidate AP set corresponding to the terminal is determined according to the service requirements and / or behavior characteristics of the user.

[0062] Optionally, after establishing the target AP cooperation set of the terminal, the method further includes:

[0063] According to a signal processing algorithm, the signal of the target AP cooperation set is optimized by combining the reference signals corresponding to the multiple APs in the target AP cooperation set.

[0064] The embodiment of the present invention further provides a method for constructing a wireless access point (AP) cooperation set, which is applied to an AP and includes:

[0065] Receiving first indication information sent by the network element;

[0066] Perform a time-frequency synchronization process and / or an air interface calibration process according to the first indication information, and obtain result information of the corresponding process;

[0067] Send the result information to the network element.

[0068] Optionally, the first indication information includes a sending time and a first phase when the first indication information is sent;

[0069] The performing of the time-frequency synchronization process according to the first indication information to obtain result information of the corresponding process includes:

[0070] Acquire the arrival time and the second phase when the first indication information is transmitted to the antenna port;

[0071] When the database includes the optical fiber length between the AP and the network element, perform time-frequency synchronization calibration according to the sending time, the arrival time, the first phase, the second phase, and the transmission distance of the first indication information to obtain result information corresponding to the time-frequency synchronization;

[0072] In a case where the optical fiber length is not included in the database, sending initial time-frequency information to the network element, the initial time-frequency information including AP identification information, the sending time, the first phase, the arrival time and the second phase;

[0073] Receiving a time-frequency synchronization strategy sent by the network element, wherein the time-frequency synchronization strategy includes a time adjustment value and a phase adjustment value;

[0074] Time-frequency synchronization calibration is performed according to the time adjustment value and the phase adjustment value to obtain result information corresponding to the time-frequency synchronization.

[0075] Optionally, the first indication information includes intra-group indication information and inter-group indication information;

[0076] The process of performing time-frequency synchronization according to the first indication information includes:

[0077] When receiving the intra-group indication information, performing a time and frequency synchronization process with the AP in the AP group to which the AP belongs according to the intra-group indication information;

[0078] When the inter-group indication information is received, a time and frequency synchronization process is performed with reference APs in multiple AP groups according to the inter-group indication information.

[0079] Optionally, the method further comprises:

[0080] receiving a signal conflict check request sent by the network element, where the signal conflict check request carries a first reference signal allocated by a pre-configured master AP to the terminal;

[0081] Checking, according to the signal conflict check request, whether a reference signal locally allocated to the terminal conflicts with the first reference signal, and obtaining a conflict status;

[0082] A signal conflict check response is sent to the network element, wherein the signal conflict check response includes the conflict status.

[0083] An embodiment of the present invention further provides a first network device, comprising a transceiver and a processor, wherein the processor is configured to determine an initial candidate AP set corresponding to a terminal;

[0084] The transceiver is used to send first indication information to the AP in the initial candidate AP set, where the first indication information is used to instruct the AP to perform a time-frequency synchronization process and / or an air interface calibration process;

[0085] The transceiver is further used to obtain result information of the process corresponding to the first indication information executed by the AP;

[0086] The processor is further configured to select an AP whose corresponding result information satisfies a first set condition from the initial candidate AP set, and establish a target AP cooperation set for the terminal;

[0087] The processor is further configured to update the target AP cooperation set when it is monitored that the load information of any AP in the target AP cooperation set does not satisfy a second set condition.

[0088] An embodiment of the present invention further provides a second network device, comprising a transceiver and a processor, wherein the transceiver is configured to receive first indication information sent by a network element;

[0089] The processor is configured to perform a time-frequency synchronization process and / or an air interface calibration process according to the first indication information, and obtain result information of the corresponding process;

[0090] The transceiver is further used to send the result information to the network element.

[0091] The embodiment of the present invention further provides a wireless access point AP cooperation set construction device, which is applied to a network element, including:

[0092] A first determination module, used to determine an initial candidate AP set corresponding to the terminal;

[0093] A first sending module, used to send first indication information to an AP in the initial candidate AP set, where the first indication information is used to instruct the AP to perform a time-frequency synchronization process and / or an air interface calibration process;

[0094] A first acquisition module, configured to acquire result information of a process corresponding to the first indication information executed by the AP;

[0095] A first establishing module, configured to select an AP whose corresponding result information satisfies a first set condition from the initial candidate AP set, and establish a target AP cooperation set for the terminal;

[0096] The first updating module is used to update the target AP cooperation set when it is monitored that the load information of any AP in the target AP cooperation set does not meet the second set condition.

[0097] The embodiment of the present invention further provides a wireless access point (AP) cooperation set construction device, which is applied to an AP, and includes:

[0098] A first receiving module, used to receive first indication information sent by a network element;

[0099] A first processing module, configured to perform a time-frequency synchronization process and / or an air interface calibration process according to the first indication information, and obtain result information of the corresponding process;

[0100] The second sending module is used to send the result information to the network element.

[0101] An embodiment of the present invention further provides a network device, comprising: a processor, a memory, and a program stored in the memory and executable on the processor, wherein the program implements the method for constructing a wireless access point AP cooperation set as described in any one of the above items when executed by the processor.

[0102] An embodiment of the present invention further provides a readable storage medium, comprising: a program is stored on the readable storage medium, and when the program is executed by a processor, the steps of the method for constructing a wireless access point AP cooperation set as described in any one of the above items are implemented.

[0103] An embodiment of the present invention further provides a computer program product, including computer instructions, which, when executed by a processor, implement the steps of the method for constructing a wireless access point AP cooperation set as described in any one of the above items.

[0104] At least one of the above technical solutions of the present invention has the following beneficial effects:

[0105] In the above scheme, first, the initial candidate AP set corresponding to each terminal is determined, and then, the first indication information is sent to the AP in the initial candidate AP set, wherein the first indication information is used to instruct the AP to perform a time-frequency synchronization process and / or an air interface calibration process. Secondly, according to the result information of the AP executing the process corresponding to the first indication information, the AP whose result information meets the first set condition is selected to establish a target AP collaboration set. Finally, according to the load information of the AP in the target AP collaboration set, the target AP collaboration set is dynamically updated. In the embodiment of the present invention, when constructing the target AP collaboration set, the time-frequency synchronization and antenna air interface calibration between APs are considered. The time-frequency synchronization between APs can ensure that the data of different APs will not interfere with each other when arriving at the terminal, and the antenna air interface calibration between APs can improve the data transmission efficiency. In addition, the load information of the AP is also considered to ensure that the AP is not overloaded, thereby further improving the data transmission efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0106] Figure 1 A schematic diagram of a process of constructing a wireless access point AP cooperation set according to an embodiment of the present invention;

[0107] Figure 2A schematic diagram of a flow chart of a method for constructing a wireless access point AP cooperation set according to another embodiment of the present invention;

[0108] Figure 3 It is one of the flow diagrams of the method for constructing a wireless access point AP cooperation set according to an embodiment of the present invention;

[0109] Figure 4 The second flowchart of the method for constructing a wireless access point AP cooperation set according to an embodiment of the present invention is as follows;

[0110] Figure 5 The third flowchart of the method for constructing a wireless access point AP cooperation set according to an embodiment of the present invention is shown;

[0111] Figure 6 is a schematic structural diagram of a first network device according to an embodiment of the present invention;

[0112] Figure 7 is a schematic structural diagram of a second network device according to an embodiment of the present invention;

[0113] Figure 8 A schematic diagram of the structure of a device for constructing a wireless access point AP cooperation set according to an embodiment of the present invention;

[0114] Fig. 9 It is a structural schematic diagram of a device for constructing a wireless access point AP cooperation set according to another embodiment of the present invention. DETAILED DESCRIPTION

[0115] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0116] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0117] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0118] It is worth noting that the technology described in the embodiments of the present application is not limited to the Long Term Evolution (LTE) / LTE-Advanced (LTE-A) system, but can also be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency Division Multiple Access (SC-FDMA) and other systems. The terms "system" and "network" in the embodiments of the present application are often used interchangeably, and the described technology can be used for the above-mentioned systems and radio technologies as well as for other systems and radio technologies. The following description describes a new radio (NR) system for example purposes, and NR terms are used in most of the following descriptions, but these technologies can also be applied to applications other than NR system applications, such as the 6th Generation (6G) communication system.

[0119] like Figure 1 As shown, an embodiment of the present invention provides a method for constructing a wireless access point AP cooperation set, which is applied to a network element and includes:

[0120] Step S101, determining an initial candidate AP set corresponding to the terminal;

[0121] In step S101, for each terminal, its corresponding initial candidate AP is determined respectively. Generally, the initial candidate AP is determined based on the performance of a reference signal.

[0122] Step S102: sending first indication information to an AP in the initial candidate AP set, where the first indication information is used to instruct the AP to perform a time-frequency synchronization process and / or an air interface calibration process;

[0123] In step S102, before constructing the target AP collaboration set, the AP needs to be time-frequency synchronized and / or air interface calibrated to ensure that the time and frequency of all APs participating in the collaboration are the same, and the air interface phase is consistent. If the first indication information is used to instruct the AP to perform a time-frequency synchronization process, the first indication information includes the sending time when the first indication information is sent and the first phase when the first indication information is sent. If the first indication information is used to instruct the AP to perform a time-frequency synchronization process, the first indication information includes but is not limited to one or more of the antenna phase information, amplitude information and delay information.

[0124] It should be noted that, due to the AP local clock and frequency drift, when the first indication information is used to instruct the AP to perform a time and frequency synchronization process, the first indication information is triggered periodically.

[0125] Step S103, obtaining result information of the AP executing the process corresponding to the first indication information;

[0126] Step S104, selecting an AP whose corresponding result information meets a first set condition from the initial candidate AP set, and establishing a target AP cooperation set for the terminal;

[0127] In step S104, if the first indication information is used to instruct the AP to perform a time-frequency synchronization process, the result information may be the time-frequency parameters of the AP after the AP performs the time-frequency synchronization process, and the network element selects an AP whose time-frequency parameters meet the first set conditions and establishes a target AP collaboration set; the result information may also be the status of the AP after the time-frequency synchronization process, such as a success status or a failure status, wherein the success status is used to indicate that the AP meets the first set conditions.

[0128] If the first indication information is used to instruct the AP to perform an air interface calibration process, similarly, the result information may be the air interface calibration parameters of the AP after the AP performs the air interface calibration process. The network element selects the AP whose air interface calibration parameters meet the first set conditions and establishes a target AP collaboration set; the result information may also be the status of the AP after the air interface calibration process, such as a success status or a failure status, wherein the success status is used to indicate that the AP meets the first set conditions.

[0129] Step S105: When it is monitored that the load information of any AP in the target AP cooperation set does not satisfy the second set condition, the target AP cooperation set is updated.

[0130] In step S105, the load information of the APs in the target AP collaboration set is monitored, for example: periodic load prediction or evaluation is performed based on the business processing volume of each AP; if it is monitored that the load information of any of the APs does not meet the second set condition, it means that the AP has a large load and cannot efficiently transmit data, so it is necessary to update the target AP collaboration set based on the AP load information to improve data transmission efficiency.

[0131] In the embodiment of the present invention, the network elements include but are not limited to base stations or centralized control units, and one terminal corresponds to one target AP collaboration set. When constructing the target AP collaboration set, the present invention takes into account the time and frequency synchronization between APs and the antenna air interface calibration. The time and frequency synchronization between APs can ensure that data from different APs do not interfere with each other when arriving at the terminal. The antenna air interface calibration between APs can improve data transmission efficiency. In addition, the load information of the AP is also considered to ensure that the AP is not overloaded, thereby further improving the data transmission efficiency.

[0132] Optionally, the method further comprises:

[0133] When a third set condition is detected, reconstructing the target AP cooperation set;

[0134] Wherein, the third setting condition includes:

[0135] The signal quality of the reference signal of the first AP in the target AP cooperation set measured by the terminal is less than a first threshold;

[0136] A performance parameter of a second AP in the target AP cooperation set measured by the terminal is less than a second threshold.

[0137] In an embodiment of the present invention, the APs in the target AP cooperation set are monitored in real time. When the above-mentioned third setting condition is monitored, it indicates that there is a problem of decreased reference signal quality and / or poor performance of the APs in the target AP cooperation set, which affects the data transmission between the target AP cooperation set and the terminal. Therefore, it is necessary to reconstruct the target AP cooperation set so that the target AP cooperation set meets the demand again and improves the data transmission efficiency.

[0138] Optionally, the reconstruction operation includes one or more of the following:

[0139] Deleting the first AP;

[0140] Deleting the second AP;

[0141] Adding a third AP whose reference signal quality is greater than the first threshold to the target AP cooperation set;

[0142] A fourth AP having a performance parameter greater than the second threshold is added to the target AP cooperation set.

[0143] In an embodiment of the present invention, the reconstruction operation is specifically described. When the signal quality of a reference signal of a first AP is less than a first threshold, the first AP is deleted from the target AP collaboration set and / or a third AP whose signal quality of other reference signals is greater than the first threshold is added to the target AP collaboration set, and the target AP collaboration set is reconstructed; when a performance parameter of a second AP is less than a second threshold, the second AP is deleted from the target AP collaboration set and / or a fourth AP whose other performance parameter is greater than the second threshold is added to the target AP collaboration set, and the target AP collaboration set is reconstructed.

[0144] Optionally, the result information corresponding to the time-frequency synchronization process includes time-frequency parameters, and the time-frequency parameters include a sending time when the first indication information is sent, an arrival time when the first indication information is transmitted to the antenna port of the AP, a first phase when the first indication information is sent, and a second phase when the first indication information is transmitted to the antenna port of the AP;

[0145] The result information corresponding to the air interface calibration process includes air interface calibration parameters, and the air interface calibration parameters include one or more of phase, amplitude and delay;

[0146] The first setting condition includes one or more of the following:

[0147] The time difference between the sending time and the arrival time in the time-frequency parameter is less than a third threshold;

[0148] A phase difference between the first phase and the second phase is less than a fourth threshold;

[0149] The parameters in the air interface calibration parameters meet the preset requirements.

[0150] In an embodiment of the present invention, when the first indication information is used to instruct the AP to perform a time-frequency synchronization process, the result information corresponding to the time-frequency synchronization process includes the time-frequency parameters. If the time difference between the sending time and the arrival time in the time-frequency parameters is greater than or equal to the third threshold, and / or the phase difference between the first phase and the second phase is greater than or equal to the fourth threshold, it indicates that the time-frequency synchronization process has failed, for example: the time difference exceeds the cyclic prefix length; if the phase in the air interface calibration parameter does not meet the preset requirements and / or the amplitude does not meet the preset requirements and / or the delay does not meet the preset requirements, it indicates that the air interface calibration process has failed, wherein the preset requirements are set according to actual conditions, and the effect of air interface calibration can be achieved, and the present invention does not limit this, for example: the air interface calibration parameters of the AP after air interface calibration cannot reach the threshold relative to the air interface calibration parameters of the reference AP. Therefore, an AP that meets the first set condition is selected to establish a target AP collaboration set.

[0151] Optionally, obtaining result information of a process corresponding to the first indication information executed by the AP, the method further includes:

[0152] Receiving initial time-frequency information sent by the plurality of APs according to the first indication information, the initial time-frequency information including identification information of corresponding APs and the initial time-frequency parameters;

[0153] According to the initial time-frequency parameters, respectively obtain a time-frequency synchronization strategy for each of the APs, wherein the time-frequency synchronization strategy is used to adjust the time-frequency parameters;

[0154] Sending the corresponding time-frequency synchronization strategy to the AP according to the identification information of the AP;

[0155] Obtain result information of the AP executing the time-frequency synchronization strategy.

[0156] In an embodiment of the present invention, the first indication information instructs the AP to execute the time-frequency synchronization process. After sending the first indication information, the result information of the process corresponding to the AP executing the time-frequency synchronization process is obtained. There are two situations for obtaining the result information. The first situation is that the AP side directly performs time-frequency synchronization locally after receiving the first indication information, and the network element directly obtains the result information after the AP performs the time-frequency synchronization. The second situation is that the AP side cannot directly perform time-frequency synchronization after receiving the first indication information, and needs to synchronize according to further instructions of the network element. Therefore, the network element side first receives the initial time-frequency information sent by the AP according to the first indication information, and then, the network element side obtains the time-frequency synchronization strategy corresponding to each AP according to the time-frequency parameters in the initial time-frequency information. Secondly, according to the identification information of the AP in the initial time-frequency information, the corresponding time-frequency synchronization strategy is sent to the AP. Finally, the result information of the AP performing time-frequency synchronization according to the time-frequency synchronization strategy is obtained.

[0157] Among them, the sending time of the first indication information in the time-frequency parameters and the first phase when the first indication information is sent are carried in the first indication information, and the arrival time of the first indication information transmitted to the antenna port of the AP and the second phase of the first indication information transmitted to the antenna port of the AP are recorded on the AP side.

[0158] Optionally, the time-frequency synchronization strategy includes a time adjustment value and a phase adjustment value;

[0159] The obtaining, according to the initial time-frequency parameters, a time-frequency synchronization strategy of each AP, comprises:

[0160] Obtaining a time difference for each of the APs according to the sending time and the arrival time in the initial time-frequency parameters;

[0161] Obtaining middle values ​​of a plurality of the time differences in descending order of the time differences;

[0162] Obtaining the time adjustment value of each of the APs according to the time difference corresponding to each of the APs and the middle value of the time difference;

[0163] Obtaining a phase difference of each of the APs according to the first phase and the second phase in the initial time-frequency parameters;

[0164] Obtaining a plurality of intermediate values ​​of the phase differences in descending order of the phase differences;

[0165] The phase adjustment value of each AP is obtained according to the phase difference corresponding to each AP and the intermediate value of the phase difference.

[0166] In an embodiment of the present invention, a specific method for obtaining an AP's time-frequency synchronization strategy is provided. First, the time difference and phase difference of each AP are obtained respectively; then, the time differences are sorted in descending order to determine the middle value of the time differences; and the phase differences are sorted in descending order to determine the middle value of the phase differences; finally, the difference between the time difference corresponding to each AP and the middle value of the time difference is calculated respectively, and a time adjustment value for time-frequency adjustment of the AP is determined according to the difference; the difference between the phase difference corresponding to each AP and the middle value of the phase difference is calculated respectively, and a phase adjustment value for time-frequency adjustment of the AP is determined according to the difference.

[0167] It should be noted that if the difference between the time difference corresponding to an AP and the middle value of the time difference is greater than the seventh threshold, it means that the AP difference is too large to be adjusted, and the AP can be directly deleted from the initial candidate AP set without calculating its corresponding time adjustment value or performing time-frequency synchronization to improve efficiency. Similarly, if the difference between the phase difference corresponding to an AP and the middle value of the phase difference is greater than the eighth threshold, the AP can be directly deleted from the initial candidate AP set, where the seventh threshold and the eighth threshold are set according to actual conditions, and the present invention is not limited to this.

[0168] Optionally, the method further comprises:

[0169] When the number of APs in the initial candidate AP set is greater than a first threshold, dividing the APs in the initial candidate AP set into a plurality of AP groups, each of the AP groups including a reference AP and at least one fifth AP;

[0170] Wherein, when the first indication information is used to instruct the AP to perform a time-frequency synchronization process, the first indication information includes intra-group indication information and inter-group indication information, the intra-group indication information is used to instruct the reference AP and the fifth AP in each of the AP groups to perform a time-frequency synchronization process, and the inter-group indication information is used to instruct the reference APs between the multiple AP groups to perform a time-frequency synchronization process;

[0171] The sending first indication information to the APs in the initial candidate AP set includes:

[0172] The intra-group indication information and the inter-group indication information are sequentially sent to the APs in the initial candidate AP set, or the inter-group indication information and the intra-group indication information are sequentially sent to the APs in the initial candidate AP set.

[0173] In an embodiment of the present invention, if a large number of APs participate in the time-frequency synchronization process, a grouped and layered time-frequency synchronization mechanism is adopted to divide the APs in the candidate AP set into multiple AP groups, each AP group including a benchmark AP and at least one fifth AP; at this time, when the first indication information is used to instruct the AP to perform the time-frequency synchronization process, the first indication information may further instruct the APs in the candidate AP set to first perform time-frequency synchronization within the group and then perform time-frequency synchronization between groups, or instruct the APs in the candidate AP set to first perform time-frequency synchronization between groups of multiple benchmark APs, and then perform time-frequency synchronization within the group according to the benchmark APs.

[0174] It should be noted that if there are multiple terminals and there is a large overlap in the AP sets serving different terminals, after synchronizing one group of APs, for another UE, it is only necessary to synchronize the different APs with any AP in the synchronized AP group, thereby reducing the overhead of time and frequency synchronization between APs.

[0175] Optionally, when the first indication information is used to instruct the AP to perform an air interface calibration process, generally, multiple antenna units within each AP are first instructed to perform air interface calibration, and then reference antenna ports between multiple APs are instructed to perform calibration.

[0176] Optionally, the second set condition includes that a load value indicated in the load information is less than a sixth threshold.

[0177] In the embodiment of the present invention, the second setting condition is mainly used to limit the load condition of the AP, that is, to consider the computing power of each AP. Because in a non-cellular large-scale MIMO network, the AP may need to complete precoding and terminal detection, signal merging and other computing power-consuming functions. However, the computing power of each AP is limited, and the load value of each AP corresponds to an upper limit, namely the sixth threshold. Therefore, the AP whose corresponding load information meets the second setting condition is selected to establish a target AP collaboration set corresponding to the terminal.

[0178] Optionally, when it is monitored that the load information of any AP in the target AP cooperation set does not satisfy a second set condition, updating the target AP cooperation set includes:

[0179] In the case where it is monitored that the load information of at least one of the APs does not satisfy the second set condition, determining the AP that does not satisfy the second set condition as an AP to be adjusted;

[0180] According to the service priority of the terminal corresponding to the target AP cooperation set, the AP to be adjusted is adjusted to update the target AP cooperation set;

[0181] The adjustment operation includes one or more of the following:

[0182] Deleting the AP to be adjusted from at least one of the target AP cooperation sets;

[0183] The AP to be adjusted is deleted from at least one of the target AP cooperation sets and the AP to be adjusted is added to another one or more of the target AP cooperation sets.

[0184] In the embodiment of the present invention, if it is detected that the load information of at least one AP does not meet the second setting condition, it means that the AP is overloaded, the AP is determined as the AP to be adjusted, and an adjustment operation is performed on the AP to be adjusted. The adjustment operation is described in detail below:

[0185] The known conditions are: one terminal corresponds to one target AP cooperation set, and the target AP cooperation set includes multiple APs. One AP can serve multiple terminals, namely multiple target AP cooperation sets, at the same time. However, since the computing power of each AP is limited, the number of users that each AP can support varies according to the amount of data transmitted by the served terminals. Therefore, if there is an AP whose load information does not meet the second set condition, namely, the AP is overloaded, it is necessary to delete the AP to be adjusted from at least one target AP cooperation set. Optionally, after the AP to be adjusted is deleted from at least one target AP cooperation set, if the AP to be adjusted still has the computing power to load other terminals, the AP to be adjusted can also be added to the target AP cooperation set corresponding to other terminals.

[0186] Furthermore, the adjustment operation in the embodiment of the present invention is performed according to the service priority of the terminal corresponding to the target AP cooperation set, and the terminals with high priority are satisfied as much as possible. For example, if the service priority corresponding to the first terminal connected to the AP to be adjusted is low, and the service priority corresponding to the second terminal connected to the AP to be adjusted is high, the AP to be adjusted is preferentially deleted from the target AP cooperation set corresponding to the first terminal. For example, after the AP to be adjusted is deleted from at least one target AP cooperation set, the AP to be adjusted still has the computing power to load the third terminal (with high service priority) and the fourth terminal (with low service priority), the AP is preferentially added to the target AP cooperation set of the third terminal, and the high-priority service is preferentially ensured.

[0187] Optionally, the method further comprises:

[0188] Sending a signal conflict check request to each of the plurality of APs in the target AP cooperation set, wherein the signal conflict check request carries a first reference signal allocated to the terminal by a pre-configured master AP;

[0189] receiving a signal conflict check response sent by the AP, where the signal conflict check response includes a conflict status between a reference signal respectively allocated by each of the APs to the terminal and the first reference signal;

[0190] According to the conflict status, the AP that conflicts with the first reference signal is deleted from the target AP cooperation set, and the target AP cooperation set is updated.

[0191] In an embodiment of the present invention, each terminal is pre-configured with a main AP for data and signal transmission. In order to avoid pilot pollution, it is also necessary to ensure that the reference signal of the AP in the final target AP cooperation set does not conflict with the reference signal of the main AP. Therefore, before establishing the target AP cooperation set corresponding to the terminal, the network element sends a signal conflict check request to each of the multiple APs in the target AP cooperation set. The signal conflict check request carries the first reference signal allocated to the terminal by the pre-configured main AP, which is used to instruct the AP to detect whether the local reference signal conflicts with the first reference signal of the main AP. Finally, the network element deletes the AP that conflicts with the first reference signal from the target AP cooperation set according to the conflict status of the reference signal, updates the target AP cooperation set, and avoids pilot pollution.

[0192] Optionally, determining an initial candidate AP set corresponding to the terminal includes:

[0193] Acquiring a service request of the terminal, wherein the service request includes a service demand and / or behavior characteristics of a user;

[0194] An initial candidate AP set corresponding to the terminal is determined according to the service requirements and / or behavior characteristics of the user.

[0195] In an embodiment of the present invention, the construction of a target AP collaboration set can meet user customized services. In the process of determining the initial candidate AP set, first, the network element obtains the service request of the corresponding terminal through the pre-configured main AP, wherein one terminal corresponds to one main AP, and the service request includes the user's service needs and / or behavior characteristics. The service request is used to customize the initial candidate AP set. Then, the network element determines the initial candidate AP set corresponding to the terminal according to the user's service needs and / or behavior characteristics. For example: when the service demand is a large-bandwidth service, the initial candidate AP set needs to include more APs to form a large-scale MIMO channel and use space division multiplexing to provide it with high-speed data transmission; when the service demand is a small data packet service, the initial candidate AP set can include fewer APs; when the behavior characteristic is that the terminal is in a high-speed mobile state, the network element determines the corresponding initial candidate AP set based on the predicted user's movement trajectory.

[0196] In addition, the initial candidate AP set is generally determined by the network element based on the reference signal information of the AP, wherein the reference signal information includes but is not limited to the reference signal received power (RSRP) and the signal to interference plus noise ratio (SINR).

[0197] The present invention illustrates the process of determining the initial candidate AP set through the following embodiment: the network element sends AP measurement configuration information to the terminal according to the service request, the terminal performs reference signal measurement on the periodically acquired AP reference information according to the AP measurement configuration information, obtains the reference signal measurement result and sends it to the network element, and the network element determines the initial candidate AP set corresponding to the terminal according to the reference signal measurement result, wherein the reference signal measurement result includes the reference signal information of the AP. It should be noted that the terminal periodically sends the reference signal measurement result to the network element, and the network element also dynamically updates the target AP collaboration set according to the reference signal measurement result.

[0198] Optionally, after establishing the target AP cooperation set of the terminal, the method further includes:

[0199] According to a signal processing algorithm, the signal of the target AP cooperation set is optimized by combining the reference signals corresponding to the multiple APs in the target AP cooperation set.

[0200] In the embodiment of the present invention, the signal processing algorithm includes but is not limited to a linear minimum mean square error (LMMSE) algorithm or a maximum ratio combining (MRC) algorithm. After the target AP cooperation set is signal optimized, signal interference can be reduced.

[0201] like Figure 2 As shown, an embodiment of the present invention further provides a method for constructing a wireless access point AP cooperation set, which is applied to an AP, and includes:

[0202] Step S201, receiving first indication information sent by a network element;

[0203] Step S202: performing a time-frequency synchronization process and / or an air interface calibration process according to the first indication information, and obtaining result information of the corresponding process;

[0204] Step S203: Send the result information to the network element.

[0205] In an embodiment of the present invention, during the construction of the target AP collaboration set, the AP side performs a time-frequency synchronization process and / or an air interface calibration process according to the first indication information sent by the network element, and sends result information corresponding to the time-frequency synchronization process and / or the air interface calibration process to the network element. The time-frequency synchronization between APs can ensure that data from different APs do not interfere with each other when arriving at the terminal, and the air interface calibration of antennas between APs can improve the data transmission efficiency between the AP and the terminal.

[0206] Among them, if the first indication information is used to instruct the AP to perform a time-frequency synchronization process, the result information can be the time-frequency parameters of the AP after the AP performs the time-frequency synchronization process, or it can be the state of the AP after the time-frequency synchronization process, such as a success state or a failure state, wherein the success state is used to indicate that the AP meets the above-mentioned first setting condition. If the first indication information is used to instruct the AP to perform an air interface calibration process, similarly, the result information can be the air interface calibration parameters of the AP after the AP performs the air interface calibration process, or it can be the state of the AP after the air interface calibration process, such as a success state or a failure state, wherein the success state is used to indicate that the AP meets the above-mentioned first setting condition.

[0207] Optionally, the first indication information includes a sending time and a first phase when the first indication information is sent;

[0208] The performing of the time-frequency synchronization process according to the first indication information to obtain result information of the corresponding process includes:

[0209] Acquire the arrival time and the second phase when the first indication information is transmitted to the antenna port;

[0210] When the database includes the optical fiber length between the AP and the network element, perform time-frequency synchronization calibration according to the sending time, the arrival time, the first phase, the second phase, and the transmission distance of the first indication information to obtain result information corresponding to the time-frequency synchronization;

[0211] In a case where the optical fiber length is not included in the database, sending initial time-frequency information to the network element, the initial time-frequency information including AP identification information, the sending time, the first phase, the arrival time and the second phase;

[0212] Receiving a time-frequency synchronization strategy sent by the network element, wherein the time-frequency synchronization strategy includes a time adjustment value and a phase adjustment value;

[0213] Time-frequency synchronization calibration is performed according to the time adjustment value and the phase adjustment value to obtain result information corresponding to the time-frequency synchronization.

[0214] In the embodiment of the present invention, there are two cases where the AP performs the time-frequency synchronization process and obtains result information of the corresponding process, which are described below respectively:

[0215] The first one is that, when the database includes the length of the optical fiber between the AP and the network element, the time-frequency synchronization calibration can be performed directly locally according to the sending time, arrival time, first phase, second phase and transmission distance of the first indication information to obtain the result information corresponding to the time-frequency synchronization. The specific time-frequency synchronization steps are well known to those skilled in the art and will not be described in detail here.

[0216] The second method is that when the database does not include the fiber length, the AP cannot directly perform time-frequency synchronization calibration locally. Therefore, it sends initial time-frequency information to the network element, allowing the network element to formulate a time-frequency synchronization strategy, and finally adjusts the time and phase according to the time-frequency synchronization strategy sent by the network element to obtain the result information.

[0217] Optionally, the first indication information includes intra-group indication information and inter-group indication information;

[0218] The process of performing time-frequency synchronization according to the first indication information includes:

[0219] When receiving the intra-group indication information, performing a time and frequency synchronization process with the AP in the AP group to which the AP belongs according to the intra-group indication information;

[0220] When the inter-group indication information is received, a time and frequency synchronization process is performed with reference APs in multiple AP groups according to the inter-group indication information.

[0221] In the embodiment of the present invention, when the AP end receives the intra-group indication information, it performs the time-frequency synchronization process with the APs in the group to which the AP belongs; when the AP end receives the inter-group indication information, it performs the time-frequency synchronization process with the APs in other AP groups. Specifically, each AP group pre-sets a reference AP, and performs the time-frequency synchronization process with the reference APs in each group. This allows the time and frequency between multiple APs to be synchronized to avoid interference.

[0222] Optionally, the method further comprises:

[0223] receiving a signal conflict check request sent by the network element, where the signal conflict check request carries a first reference signal allocated by a pre-configured master AP to the terminal;

[0224] Checking, according to the signal conflict check request, whether a reference signal locally allocated to the terminal conflicts with the first reference signal, and obtaining a conflict status;

[0225] A signal conflict check response is sent to the network element, wherein the signal conflict check response includes the conflict status.

[0226] In an embodiment of the present invention, based on a signal conflict check request sent by a network element, it is checked whether the reference signal locally allocated to the terminal conflicts with the first reference signal allocated to the terminal by the main AP, a conflict status is obtained, and the conflict status is fed back to the network element, so that the network element can select an AP to construct a target AP collaboration set according to the conflict status to avoid pilot pollution.

[0227] like Figures 3 to 5 As shown, Figures 3 to 5 Together, they constitute a specific embodiment, which is used to illustrate the specific process between the terminal, AP, and network element in the process of establishing the target AP cooperation set. There are four processes in total, which are described in turn:

[0228] Prerequisites: The primary AP corresponding to the terminal has been determined and the terminal has been connected;

[0229] Process 1: Figure 3 As shown, an initial candidate AP set corresponding to the terminal is constructed;

[0230] Step S301: The terminal sends a service request to the network element through the primary AP, where the service request includes the user's service requirements and / or behavior characteristics;

[0231] Step S302: The network element sends AP measurement configuration information to the terminal according to the service request;

[0232] Step S303, multiple APs periodically send reference signals to the terminal respectively;

[0233] Step S304: The terminal measures the reference information according to the AP measurement configuration information to obtain a reference signal measurement result;

[0234] Step S305, the terminal periodically sends the reference signal measurement result to the network element;

[0235] Step S306: The network element determines an initial candidate AP set corresponding to the terminal according to the reference signal measurement result, wherein the reference signal measurement result includes reference signal information of the AP, for example, the reference signal information is RSRP and SINR, and the network element selects an AP whose RSRP and SINR are not lower than the corresponding set thresholds to determine the initial candidate AP set.

[0236] It should be noted that step S303 is sent periodically in the entire process.

[0237] Process 2: Figure 4 As shown, the AP is synchronized with the frequency and calibrated over the air interface;

[0238] Step S401: The network element sends first indication information to an AP in an initial candidate AP set, where the first indication information is used to instruct the AP to perform a time and frequency synchronization process; wherein, if the database of the AP includes the optical fiber length between the AP and the network element, the process proceeds to step S402; and if the database does not include the optical fiber length between the AP and the network element, the process proceeds to step S403;

[0239] Step S402, the AP performs time-frequency synchronization calibration according to the first indication information and the optical fiber length, obtains corresponding first result information, and then goes to step S407;

[0240] Step S403, the AP sends initial time-frequency information to the network element according to the first indication information;

[0241] Step S404, the network element determines the time-frequency synchronization strategy of the AP according to the initial time-frequency information;

[0242] Step S405, the network element sends the corresponding time-frequency synchronization strategy to the AP;

[0243] Step S406, the AP performs time-frequency synchronization calibration according to the time-frequency synchronization strategy to obtain corresponding first result information;

[0244] Step S407, the AP sends first result information to the network element;

[0245] Step S408, the network element deletes the AP that does not meet the first set condition from the initial candidate AP set according to the first result information;

[0246] Step S409: The network element sends first indication information to the AP in the initial candidate AP set, where the first indication information is used to instruct the AP to perform an air interface calibration process;

[0247] Step S410, the AP performs air interface calibration according to the first instruction information to obtain corresponding second result information;

[0248] Step S411, the AP sends second result information to the network element;

[0249] Step S412: The network element deletes the APs that do not meet the first set condition from the initial candidate AP set according to the second result information;

[0250] Process 3: Figure 5 As shown, a target AP cooperation set is constructed;

[0251] Step S501: The network element sends a signal conflict check request to an AP in an initial candidate AP set, wherein the signal conflict check request carries a first reference signal allocated by a pre-configured primary AP to a terminal;

[0252] Step S502: The AP checks, according to the signal conflict check request, whether a reference signal locally allocated to the terminal conflicts with the first reference signal, and obtains a conflict status;

[0253] Step S503, the AP sends a signal conflict check response to the network element, where the signal conflict check response includes a conflict status;

[0254] Step S504: The network element deletes the AP that conflicts with the first reference signal from the target AP cooperation set according to the conflict state, and constructs the target AP cooperation set.

[0255] Process 4: Dynamically update the target AP collaboration set;

[0256] Method 1: The network element performs periodic load prediction or evaluation based on the service processing volume of each AP to obtain the load information of each AP;

[0257] When at least one AP load information does not satisfy the second set condition, dynamically updating the target AP cooperation set according to the AP load information;

[0258] Method 2:

[0259] The network element periodically receives the reference signal measurement result sent by the terminal;

[0260] The target AP cooperation set is dynamically updated according to the reference signal measurement results.

[0261] like Figure 6As shown, the embodiment of the present invention further provides a first network device 600, including a transceiver 610 and a processor 620, wherein the processor 620 is used to determine an initial candidate AP set corresponding to a terminal;

[0262] The transceiver 610 is used to send first indication information to the AP in the initial candidate AP set, where the first indication information is used to instruct the AP to perform a time-frequency synchronization process and / or an air interface calibration process;

[0263] The transceiver 610 is further configured to obtain result information of the process corresponding to the first indication information executed by the AP;

[0264] The processor 620 is further configured to select an AP whose corresponding result information satisfies a first set condition from the initial candidate AP set, and establish a target AP cooperation set for the terminal;

[0265] The processor 620 is further configured to update the target AP cooperation set when it is detected that the load information of any AP in the target AP cooperation set does not satisfy a second set condition.

[0266] Optionally, the processor 620 is further configured to:

[0267] When a third set condition is detected, reconstructing the target AP cooperation set;

[0268] Wherein, the third setting condition includes:

[0269] The signal quality of the reference signal of the first AP in the target AP cooperation set measured by the terminal is less than a first threshold;

[0270] A performance parameter of a second AP in the target AP cooperation set measured by the terminal is less than a second threshold.

[0271] Optionally, the reconstruction operation in the processor 620 includes one or more of the following:

[0272] Deleting the first AP;

[0273] Deleting the second AP;

[0274] Adding a third AP whose reference signal quality is greater than the first threshold to the target AP cooperation set;

[0275] A fourth AP having a performance parameter greater than the second threshold is added to the target AP cooperation set.

[0276] Optionally, the result information corresponding to the time-frequency synchronization process obtained by the transceiver 610 includes time-frequency parameters, and the time-frequency parameters include a sending time when the first indication information is sent, an arrival time when the first indication information is transmitted to the antenna port of the AP, a first phase when the first indication information is sent, and a second phase when the first indication information is transmitted to the antenna port of the AP;

[0277] The result information corresponding to the air interface calibration process includes air interface calibration parameters, and the air interface calibration parameters include one or more of phase, amplitude and delay;

[0278] The first setting condition in the processor 620 includes one or more of the following:

[0279] The time difference between the sending time and the arrival time in the time-frequency parameter is less than a third threshold;

[0280] A phase difference between the first phase and the second phase is less than a fourth threshold;

[0281] The parameters in the air interface calibration parameters meet the preset requirements.

[0282] Optionally, the transceiver 610 is further configured to receive initial time-frequency information sent by the multiple APs according to the first indication information, where the initial time-frequency information includes identification information of the corresponding AP and the initial time-frequency parameters;

[0283] The processor 620 is further configured to obtain a time-frequency synchronization strategy for each of the APs according to the initial time-frequency parameters, wherein the time-frequency synchronization strategy is used to adjust the time-frequency parameters;

[0284] The transceiver 610 is further configured to send the corresponding time-frequency synchronization strategy to the AP according to the identification information of the AP; and obtain result information of the AP executing the time-frequency synchronization strategy.

[0285] Optionally, the time-frequency synchronization strategy in the processor 620 includes a time adjustment value and a phase adjustment value;

[0286] The processor 620 is further configured to:

[0287] Obtaining a time difference for each of the APs according to the sending time and the arrival time in the initial time-frequency parameters;

[0288] Obtaining middle values ​​of a plurality of the time differences in descending order of the time differences;

[0289] Obtaining the time adjustment value of each of the APs according to the time difference corresponding to each of the APs and the middle value of the time difference;

[0290] Obtaining a phase difference of each of the APs according to the first phase and the second phase in the initial time-frequency parameters;

[0291] Obtaining a plurality of intermediate values ​​of the phase differences in descending order of the phase differences;

[0292] The phase adjustment value of each AP is obtained according to the phase difference corresponding to each AP and the intermediate value of the phase difference.

[0293] Optionally, the processor 620 is further configured to:

[0294] When the number of APs in the initial candidate AP set is greater than a first threshold, dividing the APs in the initial candidate AP set into a plurality of AP groups, each of the AP groups including a reference AP and at least one fifth AP;

[0295] Wherein, when the first indication information is used to instruct the AP to perform a time-frequency synchronization process, the first indication information includes intra-group indication information and inter-group indication information, the intra-group indication information is used to instruct the reference AP and the fifth AP in each of the AP groups to perform a time-frequency synchronization process, and the inter-group indication information is used to instruct the reference APs between the multiple AP groups to perform a time-frequency synchronization process;

[0296] The transceiver 610 is also used for:

[0297] The intra-group indication information and the inter-group indication information are sequentially sent to the APs in the initial candidate AP set, or the inter-group indication information and the intra-group indication information are sequentially sent to the APs in the initial candidate AP set.

[0298] Optionally, the second setting condition in the processor 620 includes that the load value indicated in the load information is less than a sixth threshold;

[0299] Optionally, the processor 620 is further configured to:

[0300] In the case where it is monitored that the load information of at least one of the APs does not satisfy the second set condition, determining the AP that does not satisfy the second set condition as an AP to be adjusted;

[0301] According to the service priority of the terminal corresponding to the target AP cooperation set, the AP to be adjusted is adjusted to update the target AP cooperation set;

[0302] The adjustment operation includes one or more of the following:

[0303] Deleting the AP to be adjusted from at least one of the target AP cooperation sets;

[0304] The AP to be adjusted is deleted from at least one of the target AP cooperation sets and the AP to be adjusted is added to another one or more of the target AP cooperation sets.

[0305] Optionally, the transceiver 610 is further configured to:

[0306] Sending a signal conflict check request to each of the plurality of APs in the target AP cooperation set, wherein the signal conflict check request carries a first reference signal allocated to the terminal by a pre-configured master AP;

[0307] receiving a signal conflict check response sent by the AP, where the signal conflict check response includes a conflict status between a reference signal respectively allocated by each of the APs to the terminal and the first reference signal;

[0308] The processor 620 is further configured to: delete the AP that conflicts with the first reference signal from the target AP cooperation set according to the conflict state, and update the target AP cooperation set.

[0309] Optionally, the transceiver 610 is further used to obtain a service request of the terminal, where the service request includes a service demand and / or behavior characteristics of a user;

[0310] The processor 620 is further configured to determine an initial candidate AP set corresponding to the terminal according to the service requirements and / or behavior characteristics of the user.

[0311] Optionally, the processor 620 is further configured to optimize the signal of the target AP cooperation set by combining reference signals corresponding to multiple APs in the target AP cooperation set according to a signal processing algorithm.

[0312] like Figure 7 As shown, the embodiment of the present invention further provides a second network device 700, including a transceiver and a processor, wherein the transceiver 710 is used to receive first indication information sent by a network element;

[0313] The processor 720 is configured to perform a time-frequency synchronization process and / or an air interface calibration process according to the first indication information, and obtain result information of the corresponding process;

[0314] The transceiver 710 is further configured to send the result information to the network element.

[0315] Optionally, the first indication information received by the transceiver 710 includes a sending time and a first phase when the first indication information is sent;

[0316] The processor 720 is further configured to obtain an arrival time and a second phase when the first indication information is transmitted to the antenna port;

[0317] When the database includes the optical fiber length between the AP and the network element, perform time-frequency synchronization calibration according to the sending time, the arrival time, the first phase, the second phase, and the transmission distance of the first indication information to obtain result information corresponding to the time-frequency synchronization;

[0318] The transceiver 710 is further used for:

[0319] In a case where the optical fiber length is not included in the database, sending initial time-frequency information to the network element, the initial time-frequency information including AP identification information, the sending time, the first phase, the arrival time and the second phase;

[0320] Receiving a time-frequency synchronization strategy sent by the network element, wherein the time-frequency synchronization strategy includes a time adjustment value and a phase adjustment value;

[0321] The processor 720 is further configured to perform time-frequency synchronization calibration according to the time adjustment value and the phase adjustment value to obtain result information corresponding to the time-frequency synchronization.

[0322] Optionally, the first indication information received by the transceiver 710 includes intra-group indication information and inter-group indication information;

[0323] The processor 720 is further configured to:

[0324] When receiving the intra-group indication information, performing a time and frequency synchronization process with the AP in the AP group to which the AP belongs according to the intra-group indication information;

[0325] When the inter-group indication information is received, a time and frequency synchronization process is performed with reference APs in multiple AP groups according to the inter-group indication information.

[0326] Optionally, the transceiver 710 is further configured to receive a signal conflict check request sent by the network element, where the signal conflict check request carries a first reference signal allocated by a pre-configured master AP to the terminal;

[0327] The processor 720 is further configured to check, according to the signal conflict check request, whether a reference signal locally allocated to the terminal conflicts with the first reference signal, and obtain a conflict status;

[0328] The transceiver 710 is further configured to send a signal conflict check response to the network element, wherein the signal conflict check response includes the conflict status.

[0329] like Figure 8As shown, an embodiment of the present invention further provides a wireless access point AP cooperation set construction device, which is applied to a network element, including:

[0330] A first determination module 801 is used to determine an initial candidate AP set corresponding to the terminal;

[0331] A first sending module 802 is used to send first indication information to the AP in the initial candidate AP set, where the first indication information is used to instruct the AP to perform a time-frequency synchronization process and / or an air interface calibration process;

[0332] A first acquisition module 803 is used to obtain result information of a process corresponding to the first indication information executed by the AP;

[0333] A first establishing module 804 is used to select an AP whose corresponding result information meets a first set condition from the initial candidate AP set, and establish a target AP cooperation set for the terminal;

[0334] The first updating module 805 is configured to update the target AP cooperation set when it is detected that the load information of any AP in the target AP cooperation set does not satisfy a second set condition.

[0335] Optionally, the device further comprises:

[0336] The first reconstruction module is used to reconstruct the target AP cooperation set when a third setting condition is detected; wherein the third setting condition includes:

[0337] The signal quality of the reference signal of the first AP in the target AP cooperation set measured by the terminal is less than a first threshold;

[0338] A performance parameter of a second AP in the target AP cooperation set measured by the terminal is less than a second threshold.

[0339] Optionally, the reconstruction operation in the first reconstruction module includes one or more of the following:

[0340] Deleting the first AP;

[0341] Deleting the second AP;

[0342] Adding a third AP whose reference signal quality is greater than the first threshold to the target AP cooperation set;

[0343] A fourth AP having a performance parameter greater than the second threshold is added to the target AP cooperation set.

[0344] Optionally, the result information corresponding to the time-frequency synchronization process acquired by the first acquisition module 803 includes time-frequency parameters, and the time-frequency parameters include the sending time when the first indication information is sent, the arrival time of the first indication information transmitted to the antenna port of the AP, the first phase when the first indication information is sent, and the second phase of the first indication information transmitted to the antenna port of the AP; the result information corresponding to the air interface calibration process includes air interface calibration parameters, and the air interface calibration parameters include one or more of phase, amplitude and delay;

[0345] The first setting condition in the first establishing module 804 includes one or more of the following:

[0346] The time difference between the sending time and the arrival time in the time-frequency parameter is less than a third threshold;

[0347] A phase difference between the first phase and the second phase is less than a fourth threshold;

[0348] The parameters in the air interface calibration parameters meet the preset requirements.

[0349] Optionally, the first acquisition module 803 includes:

[0350] A first receiving unit, configured to receive initial time-frequency information sent by the plurality of APs according to the first indication information, wherein the initial time-frequency information includes identification information of corresponding APs and the initial time-frequency parameters;

[0351] A first processing unit, configured to obtain a time-frequency synchronization strategy for each of the APs according to the initial time-frequency parameters, wherein the time-frequency synchronization strategy is used to adjust the time-frequency parameters;

[0352] A first sending unit, configured to send the corresponding time-frequency synchronization strategy to the AP according to the identification information of the AP;

[0353] The first acquisition unit is used to obtain result information of the AP executing the time-frequency synchronization strategy.

[0354] Optionally, the time-frequency synchronization strategy in the first processing unit includes a time adjustment value and a phase adjustment value;

[0355] The first processing unit comprises:

[0356] A second processing unit, configured to obtain a time difference of each AP according to the sending time and the arrival time in the initial time-frequency parameters;

[0357] A third processing unit, configured to obtain middle values ​​of the plurality of time differences in descending order of the time differences;

[0358] a fourth processing unit, configured to obtain the time adjustment value of each of the APs according to the time difference corresponding to each of the APs and an intermediate value of the time difference;

[0359] a fifth processing unit, configured to obtain a phase difference of each of the APs according to the first phase and the second phase in the initial time-frequency parameters;

[0360] A sixth processing unit, configured to obtain a plurality of intermediate values ​​of the phase differences in a descending order of the phase differences;

[0361] The seventh processing unit is used to obtain the phase adjustment value of each AP according to the phase difference corresponding to each AP and the intermediate value of the phase difference.

[0362] Optionally, the device further comprises:

[0363] A first division module, configured to divide the APs in the initial candidate AP set into a plurality of AP groups when the number of APs in the initial candidate AP set is greater than a first threshold, each of the AP groups including a reference AP and at least one fifth AP;

[0364] Wherein, when the first indication information is used to instruct the AP to perform a time-frequency synchronization process, the first indication information includes intra-group indication information and inter-group indication information, the intra-group indication information is used to instruct the reference AP and the fifth AP in each of the AP groups to perform a time-frequency synchronization process, and the inter-group indication information is used to instruct the reference APs between the multiple AP groups to perform a time-frequency synchronization process;

[0365] The first sending module 802 includes:

[0366] The second sending unit is used to send the intra-group indication information and the inter-group indication information to the APs in the initial candidate AP set in sequence, or to send the inter-group indication information and the intra-group indication information to the APs in the initial candidate AP set in sequence.

[0367] Optionally, the second setting condition in the first updating module 805 includes that the load value indicated in the load information is less than a sixth threshold;

[0368] Optionally, the first updating module 805 includes:

[0369] A first determining unit is configured to determine the AP that does not meet the second setting condition as an AP to be adjusted when it is monitored that the load information of at least one of the APs does not meet the second setting condition;

[0370] A first updating unit, configured to perform an adjustment operation on the AP to be adjusted according to the service priority of the terminal corresponding to the target AP cooperation set, and update the target AP cooperation set;

[0371] The adjustment operation includes one or more of the following:

[0372] Deleting the AP to be adjusted from at least one of the target AP cooperation sets;

[0373] The AP to be adjusted is deleted from at least one of the target AP cooperation sets and the AP to be adjusted is added to another one or more of the target AP cooperation sets.

[0374] Optionally, the device further comprises:

[0375] A third sending module is used to send a signal conflict check request to each of the plurality of APs in the target AP cooperation set, wherein the signal conflict check request carries a first reference signal allocated by a pre-configured master AP to the terminal;

[0376] A second receiving module, configured to receive a signal conflict check response sent by the AP, wherein the signal conflict check response includes a conflict status between a reference signal respectively allocated by each AP to the terminal and the first reference signal;

[0377] The second updating module is used to delete the AP that conflicts with the first reference signal from the target AP cooperation set according to the conflict state, and update the target AP cooperation set.

[0378] Optionally, the first determining module 801 includes:

[0379] A second acquisition unit, configured to acquire a service request of the terminal, wherein the service request includes a service demand and / or behavior characteristics of a user;

[0380] The third determining unit is used to determine an initial candidate AP set corresponding to the terminal according to the service requirements and / or behavior characteristics of the user.

[0381] Optionally, the device further comprises:

[0382] The first optimization module is used to optimize the signal of the target AP cooperation set by combining the reference signals corresponding to the multiple APs in the target AP cooperation set according to the signal processing algorithm.

[0383] It should be noted that the embodiment of the device is a device corresponding to the embodiment of the above method, and all implementation methods in the embodiment of the above method are applicable to the embodiment of the device and can achieve the same technical effect.

[0384] like Fig. 9 As shown, an embodiment of the present invention further provides a wireless access point AP cooperation set construction device, which is applied to AP, including:

[0385] The first receiving module 901 is used to receive first indication information sent by a network element;

[0386] A first processing module 902 is used to perform a time-frequency synchronization process and / or an air interface calibration process according to the first indication information, and obtain result information of the corresponding process;

[0387] The second sending module 903 is used to send the result information to the network element.

[0388] Optionally, the first indication information received by the first receiving module 901 includes a sending time and a first phase when the first indication information is sent;

[0389] The first processing module 902 includes:

[0390] A third acquisition unit, used to acquire the arrival time and the second phase when the first indication information is transmitted to the antenna port;

[0391] an eighth processing unit, configured to perform time-frequency synchronization calibration according to the sending time, the arrival time, the first phase, the second phase, and the transmission distance of the first indication information, and obtain result information corresponding to the time-frequency synchronization, when the database includes the optical fiber length between the AP and the network element;

[0392] A third sending unit, configured to send initial time-frequency information to the network element when the database does not include the optical fiber length, the initial time-frequency information including AP identification information, the sending time, the first phase, the arrival time and the second phase;

[0393] A second receiving unit, configured to receive a time-frequency synchronization strategy sent by the network element, wherein the time-frequency synchronization strategy includes a time adjustment value and a phase adjustment value;

[0394] The ninth processing unit is used to perform time-frequency synchronization calibration according to the time adjustment value and the phase adjustment value to obtain result information corresponding to the time-frequency synchronization.

[0395] Optionally, the first indication information received by the first receiving module 901 includes intra-group indication information and inter-group indication information;

[0396] The first processing module 902 includes:

[0397] a tenth processing unit, configured to, upon receiving the intra-group indication information, perform a time and frequency synchronization process with the AP in the AP group to which the AP belongs according to the intra-group indication information;

[0398] An eleventh processing unit is configured to, upon receiving the inter-group indication information, perform a time and frequency synchronization process with a reference AP in a plurality of AP groups according to the inter-group indication information.

[0399] Optionally, the device further comprises:

[0400] A third receiving module is used to receive a signal conflict check request sent by the network element, where the signal conflict check request carries a first reference signal allocated by a pre-configured master AP to the terminal;

[0401] A second processing module, configured to check, according to the signal conflict check request, whether a reference signal locally allocated to the terminal conflicts with the first reference signal, and obtain a conflict status;

[0402] A fourth sending module is used to send a signal conflict check response to the network element, where the signal conflict check response includes the conflict status.

[0403] It should be noted that the embodiment of the device is a device corresponding to the embodiment of the above method, and all implementation methods in the embodiment of the above method are applicable to the embodiment of the device and can achieve the same technical effect.

[0404] An embodiment of the present invention also provides a network device, including: a processor, a memory, and a program stored in the memory and executable on the processor. When the program is executed by the processor, the program implements the method for constructing a wireless access point AP collaboration set as described in any of the above items, and can achieve the same technical effect. To avoid repetition, it will not be described here.

[0405] The embodiment of the present invention also provides a readable storage medium, including: a program is stored on the readable storage medium, and when the program is executed by a processor, the steps of the wireless access point AP cooperation set construction method as described in any of the above items are implemented, and the same technical effect can be achieved. To avoid repetition, it is not repeated here. The computer-readable storage medium is, for example, a read-only memory (ROM), a random access memory (RAM), a disk or an optical disk.

[0406] An embodiment of the present invention also provides a computer program product, including computer instructions. When the computer instructions are executed by a processor, the steps of the method for constructing a wireless access point AP cooperation set as described in any of the above items are implemented, and the same technical effect can be achieved. To avoid repetition, they are not repeated here.

[0407] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0408] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for constructing a wireless access point AP cooperation set, characterized in that: Applied to network elements, including: Determine an initial candidate AP set corresponding to the terminal; Sending first indication information to an AP in the initial candidate AP set, where the first indication information is used to instruct the AP to perform a time-frequency synchronization process and / or an air interface calibration process; Obtaining result information of a process corresponding to the first indication information executed by the AP; Selecting an AP whose corresponding result information satisfies a first set condition from the initial candidate AP set, and establishing a target AP cooperation set for the terminal; When it is monitored that the load information of any of the APs in the target AP cooperation set does not satisfy the second set condition, the target AP cooperation set is updated.

2. The method for constructing a wireless access point AP cooperation set according to claim 1, characterized in that: The method further comprises: When a third set condition is detected, reconstructing the target AP cooperation set; Wherein, the third setting condition includes: A signal quality of a reference signal of a first AP in the target AP cooperation set measured by the terminal is less than a first threshold; A performance parameter of a second AP in the target AP cooperation set measured by the terminal is less than a second threshold.

3. The method for constructing a wireless access point AP cooperation set according to claim 2, characterized in that: The reconstruction operation includes one or more of the following: Deleting the first AP; Deleting the second AP; Adding a third AP whose reference signal quality is greater than the first threshold to the target AP cooperation set; A fourth AP having a performance parameter greater than the second threshold is added to the target AP cooperation set.

4. The method for constructing a wireless access point AP cooperation set according to claim 1, characterized in that: The result information corresponding to the time-frequency synchronization process includes time-frequency parameters, and the time-frequency parameters include a sending time when the first indication information is sent, an arrival time when the first indication information is transmitted to the antenna port of the AP, a first phase when the first indication information is sent, and a second phase when the first indication information is transmitted to the antenna port of the AP; The result information corresponding to the air interface calibration process includes air interface calibration parameters, and the air interface calibration parameters include one or more of phase, amplitude and delay; The first setting condition includes one or more of the following: The time difference between the sending time and the arrival time in the time-frequency parameter is less than a third threshold; A phase difference between the first phase and the second phase is less than a fourth threshold; The parameters in the air interface calibration parameters meet the preset requirements.

5. The method for constructing a wireless access point AP cooperation set according to claim 4, characterized in that: Acquiring result information of a process corresponding to the first indication information executed by the AP, the method further comprising: receiving initial time-frequency information sent by the plurality of APs according to the first indication information, wherein the initial time-frequency information includes identification information of corresponding APs and the initial time-frequency parameters; According to the initial time-frequency parameters, respectively obtain a time-frequency synchronization strategy for each of the APs, wherein the time-frequency synchronization strategy is used to adjust the time-frequency parameters; Sending the corresponding time-frequency synchronization strategy to the AP according to the identification information of the AP; Obtain result information of the AP executing the time-frequency synchronization strategy.

6. The method for constructing a wireless access point AP cooperation set according to claim 5, characterized in that: The time-frequency synchronization strategy includes a time adjustment value and a phase adjustment value; The obtaining, according to the initial time-frequency parameters, a time-frequency synchronization strategy of each AP, comprises: Obtaining a time difference for each of the APs according to the sending time and the arrival time in the initial time-frequency parameters; Obtaining middle values ​​of a plurality of the time differences in descending order of the time differences; Obtaining the time adjustment value of each of the APs according to the time difference corresponding to each of the APs and the middle value of the time difference; Obtaining a phase difference of each of the APs according to the first phase and the second phase in the initial time-frequency parameters; Obtaining a plurality of intermediate values ​​of the phase differences in descending order of the phase differences; The phase adjustment value of each AP is obtained according to the phase difference corresponding to each AP and the intermediate value of the phase difference.

7. The method for constructing a wireless access point AP cooperation set according to claim 1 or 5, characterized in that: The method further comprises: When the number of APs in the initial candidate AP set is greater than a first threshold, dividing the APs in the initial candidate AP set into a plurality of AP groups, each of the AP groups including a reference AP and at least one fifth AP; Wherein, when the first indication information is used to instruct the AP to perform a time-frequency synchronization process, the first indication information includes intra-group indication information and inter-group indication information, the intra-group indication information is used to instruct the reference AP and the fifth AP in each of the AP groups to perform a time-frequency synchronization process, and the inter-group indication information is used to instruct the reference APs between the multiple AP groups to perform a time-frequency synchronization process; The sending first indication information to the APs in the initial candidate AP set includes: The intra-group indication information and the inter-group indication information are sequentially sent to the APs in the initial candidate AP set, or the inter-group indication information and the intra-group indication information are sequentially sent to the APs in the initial candidate AP set.

8. The method for constructing a wireless access point AP cooperation set according to claim 1, characterized in that: The second setting condition includes that the load value indicated in the load information is less than a sixth threshold.

9. The method for constructing a wireless access point AP cooperation set according to claim 8, characterized in that: When it is monitored that the load information of any AP in the target AP cooperation set does not satisfy the second set condition, updating the target AP cooperation set includes: In the case where it is monitored that the load information of at least one of the APs does not satisfy the second set condition, determining the AP that does not satisfy the second set condition as an AP to be adjusted; According to the service priority of the terminal corresponding to the target AP cooperation set, the AP to be adjusted is adjusted to update the target AP cooperation set; The adjustment operation includes one or more of the following: Deleting the AP to be adjusted from at least one of the target AP cooperation sets; The AP to be adjusted is deleted from at least one of the target AP cooperation sets and the AP to be adjusted is added to another one or more of the target AP cooperation sets.

10. The method for constructing a wireless access point AP cooperation set according to claim 1, characterized in that: The method further comprises: Sending a signal conflict check request to each of the plurality of APs in the target AP cooperation set, wherein the signal conflict check request carries a first reference signal allocated to the terminal by a pre-configured master AP; receiving a signal conflict check response sent by the AP, where the signal conflict check response includes a conflict status between a reference signal respectively allocated by each of the APs to the terminal and the first reference signal; According to the conflict status, the AP that conflicts with the first reference signal is deleted from the target AP cooperation set, and the target AP cooperation set is updated.

11. The method for constructing a wireless access point AP cooperation set according to claim 1, characterized in that: The determining an initial candidate AP set corresponding to the terminal includes: Acquiring a service request of the terminal, wherein the service request includes a service demand and / or behavior characteristics of a user; An initial candidate AP set corresponding to the terminal is determined according to the service requirements and / or behavior characteristics of the user.

12. The method for constructing a wireless access point AP cooperation set according to claim 1, characterized in that: After establishing the target AP cooperation set of the terminal, the method further includes: According to a signal processing algorithm, the signal of the target AP cooperation set is optimized by combining the reference signals corresponding to the multiple APs in the target AP cooperation set.

13. A method for constructing a wireless access point AP cooperation set, characterized in that: Applied to APs, including: Receiving first indication information sent by the network element; Perform a time-frequency synchronization process and / or an air interface calibration process according to the first indication information, and obtain result information of the corresponding process; Send the result information to the network element.

14. The method for constructing a wireless access point AP cooperation set according to claim 13, characterized in that: The first indication information includes a sending time and a first phase when the first indication information is sent; The performing of the time-frequency synchronization process according to the first indication information to obtain result information of the corresponding process includes: Acquire the arrival time and the second phase when the first indication information is transmitted to the antenna port; When the database includes the optical fiber length between the AP and the network element, perform time-frequency synchronization calibration according to the sending time, the arrival time, the first phase, the second phase, and the transmission distance of the first indication information to obtain result information corresponding to the time-frequency synchronization; In a case where the optical fiber length is not included in the database, sending initial time-frequency information to the network element, the initial time-frequency information including AP identification information, the sending time, the first phase, the arrival time and the second phase; Receiving a time-frequency synchronization strategy sent by the network element, wherein the time-frequency synchronization strategy includes a time adjustment value and a phase adjustment value; Time-frequency synchronization calibration is performed according to the time adjustment value and the phase adjustment value to obtain result information corresponding to the time-frequency synchronization.

15. The method for constructing a wireless access point AP cooperation set according to claim 13 or 14, characterized in that: The first indication information includes intra-group indication information and inter-group indication information; The process of performing time-frequency synchronization according to the first indication information includes: When receiving the intra-group indication information, performing a time and frequency synchronization process with the AP in the AP group to which the AP belongs according to the intra-group indication information; When the inter-group indication information is received, a time and frequency synchronization process is performed with reference APs in multiple AP groups according to the inter-group indication information.

16. The method for constructing a wireless access point AP cooperation set according to claim 13, characterized in that: The method further comprises: receiving a signal conflict check request sent by the network element, where the signal conflict check request carries a first reference signal allocated by a pre-configured master AP to the terminal; Checking, according to the signal conflict check request, whether a reference signal locally allocated to the terminal conflicts with the first reference signal, and obtaining a conflict status; A signal conflict check response is sent to the network element, wherein the signal conflict check response includes the conflict status.

17. A first network device, characterized in that: The method comprises a transceiver and a processor, wherein the processor is used to determine an initial candidate AP set corresponding to the terminal; The transceiver is used to send first indication information to the AP in the initial candidate AP set, where the first indication information is used to instruct the AP to perform a time-frequency synchronization process and / or an air interface calibration process; The transceiver is further used to obtain result information of the process corresponding to the first indication information executed by the AP; The processor is further configured to select an AP whose corresponding result information satisfies a first set condition from the initial candidate AP set, and establish a target AP cooperation set for the terminal; The processor is further configured to update the target AP cooperation set when it is monitored that the load information of any AP in the target AP cooperation set does not satisfy a second set condition.

18. A second network device, characterized in that: comprising a transceiver and a processor, wherein: The transceiver is used to receive first indication information sent by the network element; The processor is configured to perform a time-frequency synchronization process and / or an air interface calibration process according to the first indication information, and obtain result information of the corresponding process; The transceiver is further used to send the result information to the network element.

19. A wireless access point AP cooperation set construction device, characterized in that: Applied to network elements, including: A first determination module, used to determine an initial candidate AP set corresponding to the terminal; A first sending module, used to send first indication information to an AP in the initial candidate AP set, where the first indication information is used to instruct the AP to perform a time-frequency synchronization process and / or an air interface calibration process; A first acquisition module, configured to acquire result information of a process corresponding to the first indication information executed by the AP; A first establishing module, configured to select an AP whose corresponding result information satisfies a first set condition from the initial candidate AP set, and establish a target AP cooperation set for the terminal; The first updating module is used to update the target AP cooperation set when it is monitored that the load information of any AP in the target AP cooperation set does not meet the second set condition.

20. A wireless access point AP cooperation set construction device, characterized in that: Applied to APs, including: A first receiving module, used to receive first indication information sent by a network element; A first processing module, configured to perform a time-frequency synchronization process and / or an air interface calibration process according to the first indication information, and obtain result information of the corresponding process; The second sending module is used to send the result information to the network element.

21. A network device, characterized in that: include: A processor, a memory, and a program stored in the memory and executable on the processor, wherein the program, when executed by the processor, implements the method for constructing a wireless access point AP cooperation set as described in any one of claims 1 to 12 or implements the method for constructing a wireless access point AP cooperation set as described in any one of claims 13 to 16.

22. A readable storage medium, characterized in that: include: The readable storage medium stores a program, and when the program is executed by the processor, the program implements the steps of the method for constructing a wireless access point AP cooperation set as described in any one of claims 1 to 12 or the steps of the method for constructing a wireless access point AP cooperation set as described in any one of claims 13 to 16.

23. A computer program product, characterized in that The method comprises computer instructions, which, when executed by a processor, implement the steps of the method for constructing a wireless access point AP cooperation set as described in any one of claims 1 to 12 or the steps of the method for constructing a wireless access point AP cooperation set as described in any one of claims 13 to 16.

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