阅读说明：本技术 一种基于d2d的组播重传方法及系统 (Multicast retransmission method and system based on D2D ) 是由 路永玲 黄强 张国江 王真 杨景刚 付慧 徐玲玲 贾骏 陈挺 李勇 朱雪琼 刘 于 2021-08-20 设计创作，主要内容包括：本申请涉及通信技术领域,公开了一种基于D2D的组播重传方法及系统。在该方法中,所述基站向所述簇内终端发送组播数据包；所述簇内终端分别对各自接收的组播数据包进行解码,若没有全部正确解码,则将未正确解码的簇内终端确定为NACK终端；所述簇内终端向所述NACK终端发送各自接收的组播数据包；任一所述NACK终端对自己接收到的组播数据包采用软信息合并的方式进行解码；若所述簇内终端全部正确解码,则所述簇内终端完成组播重传。本申请借助D2D簇内终端协作传输和软信息合并,在无需基站重传的情况下完成组播的正确接收。(The application relates to the technical field of communication, and discloses a multicast retransmission method and system based on D2D. In the method, the base station sends a multicast data packet to the terminals in the cluster; the cluster terminals decode the multicast data packets received by the cluster terminals respectively, and if all the multicast data packets are not decoded correctly, the cluster terminals which are not decoded correctly are determined as NACK terminals; the terminals in the cluster send the multicast data packets received by the terminals to the NACK terminal; any NACK terminal decodes the multicast data packet received by the NACK terminal by adopting a soft information combination mode; and if all the terminals in the cluster decode correctly, the terminals in the cluster finish multicast retransmission. By means of cooperative transmission and soft information combination of terminals in the D2D cluster, correct multicast receiving is completed under the condition that retransmission of a base station is not needed.)

1. A multicast retransmission method based on D2D is characterized in that the multicast retransmission method based on D2D is applied to terminals in a cluster in the power Internet of things, and the multicast retransmission method based on D2D comprises the following steps:

the terminal in the cluster receives a multicast data packet sent by a base station;

the terminal in the cluster decodes the multicast data packet;

the cluster terminal sends a multicast data packet to a NACK terminal, wherein the NACK terminal refers to the cluster terminal with decoding failure;

and if the terminals in the cluster decode correctly, finishing multicast retransmission.

2. The D2D-based multicast retransmission method according to claim 1, wherein the D2D-based multicast retransmission method further comprises:

and if the decoding of the terminal in the cluster fails, re-receiving the multicast data packet sent by the base station.

3. The D2D-based multicast retransmission method according to claim 1, wherein the power internet of things further comprises a cellular network terminal, and the cellular network terminal communicates with the in-cluster terminal through a cellular network link between the base stations.

4. The multicast retransmission method according to D2D, wherein the terminals in the cluster communicate via multi-hop communication.

5. A multicast retransmission method based on D2D is characterized in that the multicast retransmission method based on D2D is applied to a base station in the power Internet of things, and the multicast retransmission method based on D2D comprises the following steps:

the base station sends a multicast data packet to a terminal in a cluster, wherein the terminal in the cluster is used for decoding the multicast data packet and sending the multicast data packet to a NACK terminal, and if the terminal in the cluster is decoded correctly, multicast retransmission is completed; wherein, the NACK terminal refers to an intra-cluster terminal that fails in decoding.

6. The D2D-based multicast retransmission method according to claim 5, wherein the D2D-based multicast retransmission method further comprises:

and the base station retransmits the multicast data packet to the cluster terminal when the decoding of the cluster terminal fails.

7. A D2D-based multicast retransmission system, wherein the D2D-based multicast retransmission system is applied to the D2D-based multicast retransmission method of any one of claims 1-4, and the D2D-based multicast retransmission system comprises:

the first sending module is used for the terminals in the cluster to receive the multicast data packet sent by the base station;

a decoding module, configured to decode the multicast data packet by the intra-cluster terminal;

a second sending module, configured to send a multicast data packet to a NACK terminal by the intra-cluster terminal, where the NACK terminal is an intra-cluster terminal that fails to decode;

and the judging module is used for finishing multicast retransmission if the intra-cluster terminal decodes correctly.

8. The D2D-based multicast retransmission system according to claim 7, wherein the determining unit is further configured to re-receive the multicast packet sent by the base station if the decoding of the intra-cluster terminal fails.

9. A D2D-based multicast retransmission system, wherein the D2D-based multicast retransmission system is applied to the D2D-based multicast retransmission method of any one of claims 5-6, and the D2D-based multicast retransmission system comprises:

a third sending module, configured to send, by a base station, a multicast data packet to an intra-cluster terminal, where the intra-cluster terminal is configured to decode the multicast data packet and send the multicast data packet to a NACK terminal, and if the intra-cluster terminal decodes correctly, complete multicast retransmission; wherein, the NACK terminal refers to an intra-cluster terminal that fails in decoding.

10. The D2D-based multicast retransmission system according to claim 9, wherein the third sending module is further configured to, when the decoding of the in-cluster terminal fails, the base station resends the multicast packet to the in-cluster terminal.

Technical Field

The present application relates to the field of communications technologies, and in particular, to a multicast retransmission method and system based on D2D.

Background

The smart power grid is a necessary trend of power system development, the power internet of things is a key technology in the smart power grid, an advanced communication technology is fully applied around each link of the power system, and panoramic perception and ubiquitous access of various devices and personnel such as power generation, transmission, transformation, distribution, use and dispatching are achieved. This requires a high-performance power communication network as a support, and has strong requirements on the reliability and robustness of the network. Wireless Ad hoc network (Ad hoc) technology, such as Mesh networks based on WiFi, ZigBee, bluetooth, etc., characterized by being centerless and infrastructure-free, has been widely studied in applications such as power equipment monitoring.

In the aspect of fusion of Ad hoc Ad hoc network and cellular network, a Device-to-Device (D2D) is a very potential 5G enhanced technology, and is an important technical approach for solving the problems of spectrum resource shortage, network burden aggravation and the like caused by rapid increase of wireless network data volume. D2D does not require the base station as a relay, allowing terminals to communicate directly by multiplexing the radio resources of the base station. The advantages of the D2D technology are mainly: ease of base station loading, increased network throughput, ability to provide more reliable and larger capacity data transmission channels, etc.

Considering a maintenance field operation scene in the power internet of things: a team of working personnel is provided with an audio and video communication terminal, an ad hoc network is constructed in a field area, team members can communicate with each other directly or transmit in a multi-hop manner, and the ad hoc network terminal can be an inspection unmanned aerial vehicle remotely controlled by the team members. The maintenance staff is under the coverage of a cellular base station and is connected with a control center of the smart grid application platform through a base station and a dedicated channel configured in a 5G core network. The maintenance team reports the field situation to the control center through audio and video, and is connected with the remote command and operation guidance of the maintenance expert of the control center. Such downstream data streams are suitable for transmission using multicast services.

The wireless multicast simultaneously spreads the same content to a plurality of receivers, and is very suitable for emergency communication applications such as data distribution, audio and video broadcasting and the like. When some recipients fail to receive the multicast packet correctly, the multicast packet needs to be retransmitted. In 3GPP, a basic retransmission scheme is defined. In this scheme, when a certain terminal fails to correctly receive a multicast packet, the base station retransmits data to the terminal, which is a reference scheme and is inefficient. In D2D multicasting, the base station can multicast the same packet to all the terminals in the cluster at a higher rate, which does not necessarily ensure correct reception by all the terminals in the cluster. Terminals in the cluster that successfully receive may retransmit the data packet to terminals that failed to successfully receive using the D2D link. Therefore, the multicast throughput can be greatly increased, and the short-distance D2D link has better channel quality and can support high-speed retransmission, so that the multicast transmission efficiency is greatly improved.

However, in the prior art, the schemes all need to retransmit from the base station, which results in additional resource consumption, thereby reducing the network throughput.

Disclosure of Invention

The application discloses a multicast retransmission method and system based on D2D, which are used for solving the technical problems that in the prior art, the retransmission needs to be carried out from a base station, so that the additional resource consumption is caused, and the network throughput is reduced.

The application discloses a multicast retransmission method based on D2D in a first aspect, the multicast retransmission method based on D2D is applied to terminals in a cluster in the Internet of things of electric power, and the multicast retransmission method based on D2D comprises the following steps:

the terminal in the cluster receives a multicast data packet sent by a base station;

the terminal in the cluster decodes the multicast data packet;

the cluster terminal sends a multicast data packet to a NACK terminal, wherein the NACK terminal refers to the cluster terminal with decoding failure;

and if the terminals in the cluster decode correctly, finishing multicast retransmission.

With reference to the first aspect, the multicast retransmission method based on D2D further includes:

and if the decoding of the terminal in the cluster fails, re-receiving the multicast data packet sent by the base station.

With reference to the first aspect, the power internet of things further includes a cellular network terminal, and the cellular network terminal communicates with the in-cluster terminal through a cellular network link between the base stations.

With reference to the first aspect, the terminals in the cluster communicate with each other in a multi-hop communication manner.

The second aspect of the application discloses a multicast retransmission method based on D2D, the multicast retransmission method based on D2D is applied to a base station in the power internet of things, and the multicast retransmission method based on D2D includes:

the base station sends a multicast data packet to a terminal in a cluster, wherein the terminal in the cluster is used for decoding the multicast data packet and sending the multicast data packet to a NACK terminal, and if the terminal in the cluster is decoded correctly, multicast retransmission is completed; wherein, the NACK terminal refers to an intra-cluster terminal that fails in decoding.

With reference to the second aspect, the multicast retransmission method based on D2D further includes:

and the base station retransmits the multicast data packet to the cluster terminal when the decoding of the cluster terminal fails.

The third aspect of the present application discloses a multicast retransmission system based on D2D, where the multicast retransmission system based on D2D is applied to the multicast retransmission method based on D2D disclosed in the first aspect of the present application, and the multicast retransmission system based on D2D includes:

the first sending module is used for the terminals in the cluster to receive the multicast data packet sent by the base station;

a decoding module, configured to decode the multicast data packet by the intra-cluster terminal;

a second sending module, configured to send a multicast data packet to a NACK terminal by the intra-cluster terminal, where the NACK terminal is an intra-cluster terminal that fails to decode;

and the judging module is used for finishing multicast retransmission if the intra-cluster terminal decodes correctly.

With reference to the third aspect, the determining unit is further configured to re-receive the multicast data packet sent by the base station if the decoding of the intra-cluster terminal fails.

The fourth aspect of the present application discloses a D2D-based multicast retransmission system, where the D2D-based multicast retransmission system is applied to the D2D-based multicast retransmission method disclosed in the second aspect of the present application, and the D2D-based multicast retransmission system includes:

a third sending module, configured to send, by a base station, a multicast data packet to an intra-cluster terminal, where the intra-cluster terminal is configured to decode the multicast data packet and send the multicast data packet to a NACK terminal, and if the intra-cluster terminal decodes correctly, complete multicast retransmission; wherein, the NACK terminal refers to an intra-cluster terminal that fails in decoding.

With reference to the fourth aspect, the third sending module is further configured to, by the base station, resend the multicast data packet to the in-cluster terminal when decoding of the in-cluster terminal fails.

The application relates to the technical field of communication, and discloses a multicast retransmission method and system based on D2D. In the method, the base station sends a multicast data packet to the terminals in the cluster; the cluster terminals decode the multicast data packets received by the cluster terminals respectively, and if all the multicast data packets are not decoded correctly, the cluster terminals which are not decoded correctly are determined as NACK terminals; the terminals in the cluster send the multicast data packets received by the terminals to the NACK terminal; any NACK terminal decodes the multicast data packet received by the NACK terminal by adopting a soft information combination mode; and if all the terminals in the cluster decode correctly, the terminals in the cluster finish multicast retransmission. By means of cooperative transmission and soft information combination of terminals in the D2D cluster, correct multicast receiving is completed under the condition that retransmission of a base station is not needed.

Drawings

In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic working flow diagram of a multicast retransmission method based on D2D according to an embodiment of the present application;

fig. 2 is a schematic diagram of an electric power internet of things disclosed in the embodiment of the present application;

fig. 3 is a schematic diagram of multicast retransmission in a multicast retransmission method based on D2D according to an embodiment of the present application;

fig. 4 is a schematic workflow diagram of another multicast retransmission method based on D2D according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of a multicast retransmission apparatus based on D2D according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of another multicast retransmission apparatus based on D2D according to an embodiment of the present application.

Detailed Description

In order to solve the technical problem that in the prior art, the schemes all need to retransmit from the base station, which causes additional resource consumption, thereby reducing network throughput, the present application discloses a multicast retransmission method and system based on D2D through the following two embodiments.

The first embodiment of the present application discloses a multicast retransmission method based on D2D, where the multicast retransmission method based on D2D is applied to a cluster terminal in the power internet of things, referring to a workflow diagram shown in fig. 1, the multicast retransmission method based on D2D includes:

step S101, the terminal in the cluster receives a multicast data packet sent by a base station;

specifically, the multicast subscriber first receives a set of data from a base station.

Step S102, the terminal in the cluster decodes the multicast data packet;

step S103, the cluster terminal sends a multicast data packet to a NACK terminal, wherein the NACK terminal refers to the cluster terminal with decoding failure;

specifically, a terminal that is not correctly decoded feeds back NACK. The cluster terminal multicasts the received data packet copy to the NACK terminal, including that the NACK terminal multicasts the incorrectly decoded data packet copy to other NACK terminals. And any NACK terminal decodes the multiple multicast data packet copies received by the NACK terminal by adopting a soft information combination mode. The NACK terminal receives a plurality of copies of the data packet which is not decoded correctly by the NACK terminal with the assistance of the nodes in the cluster, and then the NACK terminal decodes the plurality of copies by adopting methods such as soft information combination after combining the copies. Such a decoding success rate is much improved. And the multicast data packets sent and received between the terminals in the cluster are all copies.

And step S104, if the cluster terminal decodes correctly, the multicast retransmission is completed.

In some embodiments of the present application, the multicast retransmission method based on D2D further includes:

and if the decoding of the terminal in the cluster fails, re-receiving the multicast data packet sent by the base station.

Specifically, if the decoding fails, the procedure returns to step S103 until all intra-cluster terminals receive correctly or the maximum retransmission number is exceeded.

The new cellular D2D ad hoc network, as shown in the power internet of things of fig. 2, wherein a D2D cluster is composed of terminals D1, D2, D3 and D4 which are geographically close to each other, and the terminals in the cluster can communicate with each other directly or via multi-hop communication (e.g., via D1 communication between D2 and D4 in the figure). The terminals in the cluster can be out of the coverage of the cellular base station (as shown by D4), and coverage extension is realized through D2D. When a terminal is geographically distant from the cluster of D2D and cannot join the cluster of D2D (e.g., C1), it communicates with other terminals via a cellular link between base stations.

In the above cellular D2D ad hoc network, D2D cooperation cluster is defined to have N terminals forming a set V ═ { D ═ D₁,D₂,…,D_NAnd terminals are randomly distributed, and spatial positions obey the distribution of poisson points, so that the process of lambda poisson points with density is met.

Let terminal D_iThe SINR of the received downlink signal of the base station is:

γ_i＝P_tPL_i/(I_i+σ_i ²)；

wherein P is_t、I_iAnd σ_i ²Respectively base station transmit power, interference power and noise power. PL_iIs a path loss, which can be expressed asWritable in the logarithmic domain as PL_i＝Y_i+ψ_i+X_i，Y_i＝A+αlnd_iWherein Y is_iIs a large-scale propagation loss, psi_iFor shadow fading, X_iIs a small scale Rayleigh fading effect, and X_i、Y_iAnd psi_iAre independent of each other. A and α are constants that determine the propagation model: a is related to the selection of the position of the reference point, alpha is 10 times the attenuation exponent, d_iIndicating the distance between the terminal and the base station. Small scale rayleigh fading X_iObeying a negative exponential distribution. Shadow fading psi_iMainly influenced by landform and barrier, obey the lognormal distribution, in the logarithmic domain, its probability density function is:

where σ is the standard deviation of the shadowing effect.

The novel honeycomb D2D ad hoc network model is established, the novel honeycomb D2D ad hoc network makes full use of the advantages of the 5G communication network of three-high two-low, namely high speed, high capacity, high reliability, low time delay and low energy consumption, the requirement of the ubiquitous power internet of things is completely matched, and the technical support is provided for realizing the smart power grid. From the honeycomb D2D ad hoc network model, it is easy to know that the distance between terminals in a D2D cluster is greatly reduced, and the energy of received signals is improved; on the other hand, by means of the advantage of the time-frequency resource centralized control distribution of the cellular network, the interference between terminals is reduced, and the problem of poor interference management effect of a distributed resource competition mechanism in Ad hoc can be avoided. Therefore, in the cellular D2D ad hoc network, the SINR of the wireless signal is greatly improved, which not only can increase the transmission rate between terminals, but also can achieve the effect of saving energy by reducing the transmission power.

The new cellular D2D ad hoc network also has strong advantages in terms of network topology management. In Ad hoc networks, distributed network topology and routing mechanisms make topology management and route maintenance particularly inefficient, cumbersome and complex. However, in the proposed Ad 2D Ad hoc network, the advantage of cellular network centralized management is utilized, and the base station realizes globally optimized resource allocation, scheduling and routing, thereby avoiding the difficult problems of Ad hoc in topology and routing management, simplifying network design, and improving resource utilization rate.

The wireless multicast simultaneously spreads the same content to a plurality of receivers, and is very suitable for emergency communication applications such as data distribution, audio and video broadcasting and the like. When some recipients fail to receive the multicast packet correctly, the packet needs to be retransmitted. The present embodiment proposes a method for improving multicast efficiency under the proposed ad hoc network architecture of cellular D2D.

In this embodiment, to solve the technical problem that the solutions in the prior art all need to retransmit from the base station, which results in additional resource consumption, thereby reducing network throughput, an improved multicast retransmission method is provided, and a basic principle of the method is to perform cooperative transmission in a D2D cluster by using a soft information combining mechanism, so as to fully utilize information in data that has been received by a terminal in the cluster, thereby improving multicast efficiency. When the received data fails to be decoded, the received data still contains certain information. Soft information combining uses this information to store the erroneous data packet in memory and combine it with the subsequently received retransmitted data packet to obtain a more reliable data packet than decoding alone, i.e., a "soft combining" process, and then decodes this data packet. Moreover, as a plurality of retransmission copies experience different channel conditions, the soft information combining and decoding obtains partial diversity gain, and the reliability of transmission is further improved.

In some embodiments of the application, the power internet of things further includes a cellular network terminal, and the cellular network terminal communicates with the in-cluster terminal through a cellular network link between the base stations.

In some embodiments of the present application, the terminals in the cluster communicate in a multi-hop communication manner.

To facilitate understanding of the embodiments of the present application, fig. 3 is an example of a communication process of the improved ad-hoc multicast retransmission scheme of cellular D2D, as shown in fig. 3. The base station transmits the multicast data packet B to the D2D cluster terminals D1, D2 and D3 through downlink, and if all the 3 terminals fail to correctly decode the multicast packet B, the data packets received by the terminals are respectively marked as B1, B2 and B3. At this time, D1 sends B1 to D2, and D3 sends B3 to D2. After the data interaction in the D2D cluster, each terminal has multiple copies of the multicast packet B, such as: d1 has { B1, B2}, D2 has { B1, B2, B3}, and D3 has { B2, B3 }. Each terminal then decodes the multicast packet B therefrom using soft information combining techniques. Additionally, after D3 decodes B correctly, B may be sent to D4 over D2D link D3-D4. Up to this point, the multicast packet B is correctly received by each terminal in the cluster without retransmission by the base station. If the multicast packet B still cannot be decoded correctly through the above procedure, the base station may be requested to retransmit.

The second embodiment of the present application discloses another multicast retransmission method based on D2D, where the multicast retransmission method based on D2D is applied to a base station in an electric power internet of things, referring to a work flow diagram shown in fig. 4, the multicast retransmission method based on D2D includes:

step S401, the base station sends a multicast data packet to a terminal in a cluster, wherein the terminal in the cluster is used for decoding the multicast data packet and sending the multicast data packet to a NACK terminal, and if the terminal in the cluster is decoded correctly, multicast retransmission is completed; wherein, the NACK terminal refers to an intra-cluster terminal that fails in decoding.

In some embodiments of the present application, the multicast retransmission method based on D2D further includes:

and the base station retransmits the multicast data packet to the cluster terminal when the decoding of the cluster terminal fails.

For details which are not disclosed in the second embodiment of the present application, please refer to the first embodiment of the present application

In the multicast retransmission method based on D2D disclosed in the two method embodiments of the present application, the base station sends a multicast data packet to the terminals in the cluster; the cluster terminals decode the multicast data packets received by the cluster terminals respectively, and if all the multicast data packets are not decoded correctly, the cluster terminals which are not decoded correctly are determined as NACK terminals; the terminals in the cluster send the multicast data packets received by the terminals to the NACK terminal; any NACK terminal decodes the multicast data packet received by the NACK terminal by adopting a soft information combination mode; and if all the terminals in the cluster decode correctly, the terminals in the cluster finish multicast retransmission. By means of cooperative transmission and soft information combination of terminals in the D2D cluster, correct multicast receiving is completed under the condition that retransmission of a base station is not needed.

The following are embodiments of the system of the present application that may be used to perform embodiments of the method of the present application. For details which are not disclosed in the embodiments of the system of the present application, reference is made to the embodiments of the method of the present application.

The third embodiment of the present application discloses a multicast retransmission system based on D2D, where the multicast retransmission system based on D2D is applied to the multicast retransmission method based on D2D disclosed in the first embodiment of the present application, and referring to the schematic structural diagram shown in fig. 5, the multicast retransmission system based on D2D includes:

a first sending module 51, configured to receive, by a terminal in a cluster, a multicast data packet sent by a base station;

a decoding module 52, configured to decode the multicast data packet by the intra-cluster terminal;

a second sending module 53, configured to send a multicast data packet to a NACK terminal by the intra-cluster terminal, where the NACK terminal is an intra-cluster terminal that fails in decoding;

and a determining module 54, configured to complete multicast retransmission if the intra-cluster terminal decodes correctly.

In some embodiments of the present application, the determining unit is further configured to re-receive the multicast data packet sent by the base station if the decoding of the intra-cluster terminal fails.

A fourth embodiment of the present application discloses another multicast retransmission system based on D2D, where the multicast retransmission system based on D2D is applied to the multicast retransmission method based on D2D disclosed in the second embodiment of the present application, and referring to the schematic structural diagram shown in fig. 6, the multicast retransmission system based on D2D includes:

a third sending module 61, configured to send, by the base station, a multicast data packet to a terminal in a cluster, where the terminal in the cluster is configured to decode the multicast data packet and send the multicast data packet to a NACK terminal, and if the terminal in the cluster decodes correctly, the multicast retransmission is completed; wherein, the NACK terminal refers to an intra-cluster terminal that fails in decoding.

In some embodiments of the present application, the third sending module is further configured to, by the base station, resend the multicast data packet to the in-cluster terminal when the decoding of the in-cluster terminal fails.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting the protection scope thereof, and although the present invention has been described in detail with reference to the above-mentioned embodiments, those skilled in the art should understand that after reading the present invention, they can make various changes, modifications or equivalents to the specific embodiments of the present invention, but these changes, modifications or equivalents are within the protection scope of the appended claims.