CN101826944A - Method and device for multi-node cooperative transmission - Google Patents
Method and device for multi-node cooperative transmission Download PDFInfo
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Abstract
The invention discloses a method and a device for multi-node cooperative transmission. When the number of access nodes is larger than 2, the method comprises the following steps of: carrying out space-frequency block encoding on data to be transmitted to obtain data in two channels; and dividing the access nodes into two groups, wherein the access nodes in either group respectively transmits the data in one of the two channels. The invention improves the cooperative flexibility.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of coordinated multi-point transmission method and device.
Background technology
Along with senior Long Term Evolution (Long Term Evolution-Advance, abbreviate LTE-A as) proposition of demand, sub-district average spectral efficiency (ase) and cell edge spectrum efficiency more and more come into one's own, wherein, the cell edge spectrum efficiency is of greatest concern, in its reason LTE-A system/following provisional capital is with OFDM (Orthogonal Frequency-DivisionMultiplexing, abbreviate OFDM as) be the frequency division systems of the multiple access multiplexing mode on basis, with traditional with code division multiple access (Code Division Multiple Access, abbreviate CDMA as) for the wireless communication system difference of basic multiple access multiplexing mode, the LTE-A system does not have processing gain, the sub-district is inner because complete frequency division quadrature, so almost do not have interference problem, but have to be solved in the interference processing at cell edge place.
At present, the processing of among the LTE cell edge place being disturbed mainly contains following three kinds of methods: (1) interference randomization; (2) interference eliminated; (3) interference coordination (hiding).Disturb in the processing method at these three kinds, perhaps can't eliminate interference effectively, perhaps can't utilize resource fully.Therefore, utilize the transmitting antenna cooperation transmission of a plurality of sub-districts to realize that the higher capacity of cell edge place Radio Link and multipoint cooperative transmission (CoordinatedMultiple Point Transmission and Reception abbreviates CoMP as) technology of reliable transmission become research emphasis.
Fig. 1 is the schematic diagram according to the basic principle of the CoMP of correlation technique, and as shown in Figure 1, subscriber equipment (User Equipment abbreviates UE as) 1 is positioned at the edge of sub-district (Cell) #1, Cell# 2, Cell#3, and UE2 is positioned at Cell# 1, and UE3 is positioned at Cell#3.
Fig. 2 is the schematic diagram according to the basic structure of the multi-point joint transmission of correlation technique, and as shown in Figure 2, the data of Cell 1 and 2 pairs of inputs of Cell are mapped to access node by weight vector F1, F2 respectively through processing (Preprocessing) and launch.
At third generation partner program (3rd Generation Partnership Project, abbreviate 3GPP as) in the 53bis meeting, CoMP is joined in the basic framework, in 3GPP54～3GPP 55bis meeting, the delivery plan of a series of CoMP has been proposed, in these schemes, most be based on all that desirable channel information considers.The CoMP emission diversity scheme based on irrelevant transmission that exists mainly comprises at present:
Fig. 3 is single frequency network (the Single Frequency Network according to correlation technique, abbreviate SFN as)-schematic diagram of CoMP transmission diversity method, as shown in Figure 3, in SFN-CoMP, different sub-districts is transmitted the data of same format respectively, and merges by eating dishes without rice or wine; That is, the data of Cell 1 and 2 pairs of inputs of Cell are mapped to the access node transmitting antenna by weight vector F1, F2 respectively and launch.
Fig. 4 is Cyclic Delay Diversity (the Cyclic Delay Diversity according to correlation technique, abbreviate CDD as)-schematic diagram of CoMP transmission diversity method, as shown in Figure 4, CDD-CoMP: similar with SFN-CoMP, the data that each cell transmission is identical are distinguished the data that are the different districts transmission and are carried out different cycle time-delays; That is, Cell 1 and Cell2 are mapped to access node by weight vector F1, F2 respectively to the data of importing and launch, and wherein, the data of 2 pairs of transmission of Cell have been carried out cycle time-delay, multiply by cycle phase factor e at frequency domain
J2 π Δ fk τ, wherein, k is the index of subcarrier in the frequency domain, and Δ f is the carrier spacing, and τ is corresponding to the cycle time-delay amount.
Fig. 5 is Space Frequency Block Coding (the Space Frequency BlockCode according to correlation technique, abbreviate SFBC as)-schematic diagram of CoMP transmission diversity method, as shown in Figure 5, in SFBC-CoMP, the data of different districts transmission constitute the SFBC coded format, the data of a branch road of each cell transmission SFBC coding.
Particularly, data s
1s
2At first pass through the SFBC encoding process, obtain two paths of data, suppose that the two paths of data form that obtains is s
1 
And s
2 (also can be other SFBC coding forms).Cell l is used to transmit the first via s of SFBC coding output
1 
Cell 2 is used to transmit the second circuit-switched data s of SFBC coding output
2 Then, 2 circuit-switched data of exporting being mapped to each access node transmitting antenna by weight vector F1, F2 respectively launches.
Simulation result shows, can obtain best effect based on the SFBC-CoMP scheme, but because only there is two-way in SFBC, that is, can only handle the cooperation transmission of two sub-districts, for example, situation for 3 or more a plurality of cell cooperative joint transmission, SFBC can't directly handle, and therefore, has limited cooperative flexibility.
Summary of the invention
Limited the problem of cooperative flexibility and proposed the present invention at correlation technique, for this reason, main purpose of the present invention is to provide a kind of multipoint cooperative transmit diversity scheme based on SFBC, to address the above problem.
To achieve these goals, according to an aspect of the present invention, provide a kind of coordinated multi-point transmission method.
According to coordinated multi-point transmission method of the present invention, when the number of access node greater than 2 the time, this method comprises: data waiting for transmission are carried out Space Frequency Block Coding, obtain two paths of data; Access node is divided into two groups, the circuit-switched data in the access node difference transmitting two paths data in each group.
Preferably, circuit-switched data in the access node transmitting two paths data in each group comprises: for each access node in each group, respectively a circuit-switched data waiting for transmission is carried out different Cyclic Delay Diversity in time domain, and the circuit-switched data behind the transmission Cyclic Delay Diversity.
Preferably, circuit-switched data in the access node transmitting two paths data in each group comprises: for each access node in each group, respectively a circuit-switched data waiting for transmission be multiply by circuit-switched data after the different cycle phase factors obtains handling and the circuit-switched data after the transmission process at frequency domain.
Preferably, the circuit-switched data in the access node transmitting two paths data in each group comprises: the identical circuit-switched data of each access node transmission in each group.
Preferably, the circuit-switched data in the access node transmitting two paths data in each group comprises: in different time slots, subframe or radio frames, select an access node to transmit the corresponding circuit-switched data of this group in each group.
Preferably, when there were many antennas in access node, the data that this access node is transmitted were weighted by wave beam weight, so that data map is transmitted to many transmit antennas.
Preferably, the corresponding same antenna port of each access node in each group.
Preferably, access node comprise following one of at least: sub-district, base station, relay station, Home eNodeB.
To achieve these goals, according to another aspect of the present invention, provide a kind of multipoint cooperative transmitting device.
Multipoint cooperative transmitting device according to the present invention comprises: coding module, be used for data waiting for transmission are carried out Space Frequency Block Coding, and obtain two paths of data; Grouping module is used at least three access nodes of transmission data are divided into two groups; Control module is used for controlling the every winding ingress circuit-switched data of transmitting two paths data respectively after the grouping module grouping.
Preferably, control module comprises: the diversity submodule is used for respectively a circuit-switched data waiting for transmission being carried out different Cyclic Delay Diversity in time domain; Processing sub is used for respectively a circuit-switched data waiting for transmission being multiply by a circuit-switched data after the different cycle phase factors obtains handling at frequency domain; The chooser module is used in different time slots, subframe or radio frames, selects an access node to transmit the corresponding circuit-switched data of this group in each group.
By the present invention, adopt access node is divided into two groups, the circuit-switched data in the access node transmitting two paths data in each group has solved correlation technique and has limited the problem of cooperative flexibility, and then improved cooperative flexibility.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram according to the basic principle of the CoMP of correlation technique;
Fig. 2 is the schematic diagram according to the basic structure of the multi-point joint transmission of correlation technique;
Fig. 3 is the schematic diagram according to the SFN-CoMP transmission diversity method of correlation technique;
Fig. 4 is the schematic diagram according to the CDD-CoMP transmission diversity method of correlation technique;
Fig. 5 is the schematic diagram according to the SFBC-CoMP transmission diversity method of correlation technique;
Fig. 6 is the flow chart of the coordinated multi-point transmission method of example according to the present invention;
Fig. 7 is the schematic diagram of the SFBC-BF-CDD CoMP transmission diversity method of the example one according to the present invention;
Fig. 8 is the schematic diagram of the SFBC-BF-SFN CoMP transmission diversity method of the example two according to the present invention;
Fig. 9 is the schematic diagram of the SFBC-BF-TSTD CoMP transmission diversity method of the example three according to the present invention;
Figure 10 is the structured flowchart of the multipoint cooperative transmitting device of the example according to the present invention;
Figure 11 is the concrete structure block diagram of the multipoint cooperative transmitting device of the example according to the present invention.
Embodiment
Functional overview
Consider that correlation technique has limited the problem of cooperative flexibility, need the two-way pilot tone to distinguish the two paths of data of SFBC based on SFBC-CoMP, the embodiment of the invention provides the multipoint cooperative transmit diversity scheme based on SFBC, employing is divided into two groups with access node, circuit-switched data in the access node transmitting two paths data in each group can solve the flexibility problem based on the CoMP transmission of SFBC.
Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.Describe the present invention below with reference to the accompanying drawings and in conjunction with the embodiments in detail.
Method embodiment
According to embodiments of the invention, a kind of coordinated multi-point transmission method is provided, the number that this method is mainly used in access node is greater than 2 situation, and the access node here is used to subscriber equipment that service is provided.
Fig. 6 is the flow chart of the coordinated multi-point transmission method of example according to the present invention, and as shown in Figure 6, this method comprises that following step S602 is to step S604:
Step S602 carries out SFBC to data waiting for transmission, obtains two paths of data.
Step S604 is divided into two groups with access node, the circuit-switched data in the access node difference transmitting two paths data in each group.Wherein, the access node here can comprise following one of at least: sub-district, base station, relay station, Home eNodeB.
Particularly, step S604 can realize by following several modes:
Mode one: with Space Frequency Block Coding (SFBC) and beam weighting (Beam Forming abbreviates BF as) and Cyclic Delay Diversity (CDD) co-design.
Particularly, each access node in each group carries out different Cyclic Delay Diversity (CDD) to a circuit-switched data waiting for transmission respectively in time domain, and the circuit-switched data behind the transmission Cyclic Delay Diversity; Perhaps a circuit-switched data waiting for transmission be multiply by a circuit-switched data after the different cycle phase factors obtains handling, and the circuit-switched data after the transmission process, so that obtain the effect with the CDD equivalence at frequency domain.
Mode two: Space Frequency Block Coding (SFBC) is merged co-design with beam weighting (BF) and SFN.That is to say, the identical circuit-switched data of each access node transmission in each group, promptly, the circuit-switched data that this group is corresponding is duplicated, number of copies is the number of access node in the sub-district, and send this circuit-switched data at each access node respectively, then, the recipient receives two paths of data in the mode that SFN merges.
Mode three: Space Frequency Block Coding (SFBC) and beam weighting (BF) and time switched transmit diversity (Time Switch Transmit Diversity abbreviates TSTD as) are merged co-design.That is to say, in different time slots, subframe or radio frames, select an access node to transmit the corresponding circuit-switched data of this group in each group, for example, for the integral multiple of time slot, subframe or radio frames, the mode of switching with access node in each group selects an access node to transmit the corresponding circuit-switched data of this group.
For three kinds of above-mentioned implementations, when there were many antennas in access node, the data that this access node is transmitted were weighted by wave beam weight, so that data map is transmitted to many transmit antennas.
Need to prove that in 2 access node groups, every group when a plurality of access node is all arranged, each group can be selected the processing mode described in above-mentioned three kinds of modes independently.
In addition, the corresponding same antenna port of each access node in each group that is to say that corresponding pilot tone pattern is identical with pilot frequency sequence.
By this embodiment, the above-mentioned three kinds of modes that provide can solve the existing limited flexibility problem of SFBC-CoMP.For the CoMP emission diversity method of SFBC+BF+CDD, can increase frequency diversity gain further by CDD; And the method for SFBC+BF+SFN merges by SFN, can obtain the SFN transmission gain further; The CoMP diversity transmission method of SFBC+BF, though can't obtain the CDD diversity gain or the SFN gain of above-mentioned two kinds of methods, but switch by TSTD, can obtain the space diversity transmission gain, simultaneously, reduce owing to participate in the number of cells of transmission data, can reduce the interference problem of sub-district between the system-level different cooperations territory.
Be described in detail below in conjunction with the implementation procedure of example the embodiment of the invention.
Example one
In this example, employing be the CoMP transmission diversity method of SFBC+BF+CDD, corresponding to above-mentioned mode one.
Fig. 7 is the schematic diagram of the SFBC-BF-CDD CoMP transmission diversity method of the example one according to the present invention, as shown in Figure 7, the access node number that participates in joint transmission be 3 SFBC, BF and CDD unite use the transmission diversity structure in, comprise following processing:
Data s
1s
2At first pass through the SFBC encoding process, obtain two paths of data, suppose that the two paths of data form that obtains is s
1 
And s
2 
(also can be other SFBC coding forms).
Because therefore the number of the access node of participation joint transmission, divides into groups access node greater than 2.3 access nodes (Cell 1, Cell 2, Cell 3) have been shown among Fig. 7, Cell 1 has been divided into the 1st group, be used to transmit the first via s of SFBC coding output
1 
Cell 2 and Cell 3 are divided into the 2nd group, are used to transmit the second circuit-switched data s of SFBC coding output
2
A plurality of different access node in same group carries out different circulations to data and delays.In Fig. 7, the data of Cell 2 and Cell 3 transmission all are s
2 
But the data of Cell3 transmission are to s
2 
Carried out cycle time-delay, multiply by cycle phase factor e at frequency domain
J2 π Δ fk τ, wherein, k is the index of subcarrier in the frequency domain, and Δ f is the carrier spacing, and τ is corresponding to the cycle time-delay amount.This embodiment multiply by the cyclic shift effect that the cycle phase factor produces time domain by frequency domain.
Then, 3 circuit-switched data to output are mapped on many transmit antennas of each access node by weight vector F1, F2, F3 respectively.
At this moment, the pilot tone that Cell 2 and Cell 3 corresponding a tunnel are identical, Cell 1 corresponding other one tunnel pilot tone.That is, Cell 2 and Cell 3 launch at same antenna port, and Cell 1 launches at the another one antenna port.The data of Cell 2 and Cell 3 emissions were a circuit-switched data of same antenna port correspondence in that the recipient identifies after the space merges.
The CoMP emission diversity method for SFBC+BF+CDD by this example provides can increase frequency diversity gain further by CDD.
Example two
In this example, employing be the CoMP transmission diversity method of SFBC+BF+SFN, corresponding to above-mentioned mode two.
Fig. 8 is the schematic diagram of the SFBC-BF-SFN CoMP transmission diversity method of the example two according to the present invention, as shown in Figure 8, the access node number that participates in joint transmission be 3 SFBC, BF and SFN unite use the transmission diversity structure in, the method and the method in the example one that adopt are similar, its difference only is a plurality of different access node in same group, data are not carried out cycle time-delay, but directly transmit identical data.That is to say that the data of Cell2 and Cell3 transmission are all s
2 
But the data of Cell3 transmission are not to s
2 
Carried out cycle time-delay, other processing is all identical with example one, does not repeat them here.
SFBC+BF+SFN method by this example provides merges by SFN, can obtain the SFN transmission gain further.
Example three
In this example, employing be the CoMP transmission diversity method of SFBC+BF+TSTD, corresponding to above-mentioned mode three.
Fig. 9 is the schematic diagram of the SFBC-BF-TSTD CoMP transmission diversity method of the example three according to the present invention, as shown in Figure 9, and data s
1s
2At first pass through the SFBC encoding process, obtain two paths of data s
1 
And s
2 
(also can be other SFBC coding forms).The sub-district that participates in joint transmission is divided into two groups equally, and separately as one group, Cell 2 and Cell 3 distinguish transmitting two paths data s as other one group with Cell 1
1 
And s
2 
For fear of the number of the sub-district that participates in cooperation and the inconsistent flexibility problem that brings of data way of SFBC coding output, the different districts in same group is switched at different time-gap.In Fig. 8, Cell 2 and Cell 3 belong to same group, and two sub-districts send a circuit-switched data s of SFBC coding by the mode of switching
2 
Wherein, the granularity of switching is a unit with time slot or subframe or frame.
Then, 3 circuit-switched data to output are mapped on many transmit antennas of each access node by weight vector F1, F2, F3 respectively.
At this moment, the pilot tone that Cell 2 and Cell 3 corresponding a tunnel are identical, corresponding other one tunnel pilot tone of Cell l.That is, Cell 2 and Cell 3 launch at same antenna port, and Cell 1 launches at the another one antenna port.The data of Cell 2 and Cell 3 emissions were a circuit-switched data of same antenna port correspondence in that the recipient identifies after the space merges.
By this embodiment, the SFBC+BF+TSTD method that provides is switched by TSTD, can obtain the space diversity transmission gain, simultaneously, reduces owing to participate in the number of cells of transmission data, can reduce the interference problem of sub-district between the system-level different cooperations territory.
Device embodiment
According to embodiments of the invention, a kind of multipoint cooperative transmitting device is provided, this device can be used to realize above-mentioned coordinated multi-point transmission method.Figure 10 is the structured flowchart of the multipoint cooperative transmitting device of the example according to the present invention, and as shown in figure 10, this device comprises: coding module 2, grouping module 4, control module 6 are described said structure below.
Figure 11 is the concrete structure block diagram of the multipoint cooperative transmitting device of the example according to the present invention, and as shown in figure 11, control module 6 comprises: diversity submodule 62, processing sub 64, chooser module 66 are described said structure below.
Particularly, the operation of control module 6 can realize by following several modes:
Mode one: with Space Frequency Block Coding (SFBC) and beam weighting (BF) and Cyclic Delay Diversity (CDD) co-design.
Particularly, for each access node in each group, diversity submodule 62 carries out different Cyclic Delay Diversity (CDD) to a circuit-switched data waiting for transmission respectively in time domain, and the circuit-switched data behind the transmission Cyclic Delay Diversity; Perhaps processing sub 64 multiply by a circuit-switched data after the different cycle phase factors obtains handling at frequency domain to a circuit-switched data waiting for transmission, and the circuit-switched data after the transmission process, so that obtain the effect with the CDD equivalence.
Mode two: Space Frequency Block Coding (SFBC) is merged co-design with beam weighting (BF) and SFN.That is to say, the identical circuit-switched data of each access node transmission in each group, the recipient receives two paths of data in the mode that SFN merges.
Mode three: Space Frequency Block Coding (SFBC) and beam weighting (BF) and time switched transmit diversity (Time Switch Transmit Diversity abbreviates TSTD as) are merged co-design.That is to say that in different time slots, subframe or radio frames, chooser module 66 selects an access node to transmit the corresponding circuit-switched data of this group in each group.
For three kinds of above-mentioned implementations, when there were many antennas in access node, the data that this access node is transmitted were weighted by wave beam weight, so that data map is transmitted to many transmit antennas.
Need to prove that in 2 access node groups, every group when a plurality of access node is all arranged, each group can be selected the processing mode described in above-mentioned three kinds of modes independently.
In addition, the corresponding same antenna port of each access node in each group that is to say that corresponding pilot tone pattern is identical with pilot frequency sequence.
In sum,, access node is divided into two groups by the above embodiment of the present invention, the circuit-switched data in the access node transmitting two paths data in each group, the above-mentioned three kinds of modes that wherein provide can solve the existing limited flexibility problem of SFBC-CoMP; For the CoMP emission diversity method of SFBC+BF+CDD, can increase frequency diversity gain further by CDD; And the method for SFBC+BF+SFN merges by SFN, can obtain the SFN transmission gain further; The CoMP diversity transmission method of SFBC+BF, though can't obtain the CDD diversity gain or the SFN gain of above-mentioned two kinds of methods, but switch by TSTD, can obtain the space diversity transmission gain, simultaneously, reduce owing to participate in the number of cells of transmission data, can reduce the interference problem of sub-district between the system-level different cooperations territory.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and carry out by calculation element, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a coordinated multi-point transmission method is characterized in that, when the number of access node greater than 2 the time, described method comprises:
Data waiting for transmission are carried out Space Frequency Block Coding, obtain two paths of data;
Described access node is divided into two groups, and the access node in each group transmits the circuit-switched data in the described two paths of data respectively.
2. method according to claim 1 is characterized in that, the circuit-switched data that the access node in described each group transmits in the described two paths of data comprises:
Each access node in each group carries out different Cyclic Delay Diversity to a described circuit-switched data waiting for transmission respectively in time domain, and the described circuit-switched data behind the transmission Cyclic Delay Diversity.
3. method according to claim 1 is characterized in that, the circuit-switched data that the access node in described each group transmits in the described two paths of data comprises:
For each access node in each group, the described circuit-switched data after frequency domain multiply by the different cycle phase factors to a described circuit-switched data waiting for transmission respectively and obtains handling, and the described circuit-switched data after the transmission process.
4. method according to claim 1 is characterized in that, the circuit-switched data that the access node in described each group transmits in the described two paths of data comprises:
The identical described circuit-switched data of each access node transmission in each group.
5. method according to claim 1 is characterized in that, the circuit-switched data that the access node in each group transmits in the described two paths of data comprises:
In different time slots, subframe or radio frames, select an access node to transmit the corresponding described circuit-switched data of this group in each group.
6. according to each described method in the claim 1 to 5, it is characterized in that when there were many antennas in access node, the data that this access node is transmitted were weighted by wave beam weight, so that described data map is transmitted to many transmit antennas.
7. according to each described method in the claim 1 to 5, it is characterized in that the corresponding same antenna port of each access node in each group.
8. according to each described method in the claim 1 to 5, it is characterized in that, described access node comprise following one of at least:
Sub-district, base station, relay station, Home eNodeB.
9. a multipoint cooperative transmitting device is characterized in that, comprising:
Coding module is used for data waiting for transmission are carried out Space Frequency Block Coding, obtains two paths of data;
Grouping module is used at least three access nodes of the described data of transmission are divided into two groups;
Control module is used for controlling the circuit-switched data that every winding ingress after the described grouping module grouping transmits described two paths of data respectively.
10. device according to claim 9 is characterized in that, described control module comprises:
The diversity submodule is used for respectively a described circuit-switched data waiting for transmission being carried out different Cyclic Delay Diversity in time domain;
Processing sub is used for the described circuit-switched data after frequency domain multiply by the different cycle phase factors to a described circuit-switched data waiting for transmission respectively and obtains handling;
The chooser module is used in different time slots, subframe or radio frames, selects an access node to transmit the corresponding described circuit-switched data of this group in each group.
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| US9888498B2 (en) | 2013-01-28 | 2018-02-06 | Huawei Technologies Co., Ltd. | Method for accessing wireless communication node, wireless communication node, and system for accessing wireless communication node |
| WO2018210463A1 (en) * | 2017-05-19 | 2018-11-22 | Telefonaktiebolaget Lm Ericsson (Publ) | Transmissions of blocks of data in distributed mimo systems |
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| WO2019158002A1 (en) * | 2018-02-13 | 2019-08-22 | 华为技术有限公司 | Transmission method and communication device |
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| CN112688866A (en) * | 2020-12-22 | 2021-04-20 | 上海金卓科技有限公司 | Data sending method, data receiving method, electronic equipment and storage medium |
| CN112688866B (en) * | 2020-12-22 | 2023-03-21 | 上海金卓科技有限公司 | Data sending method, data receiving method, electronic equipment and storage medium |
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