CN110768709A - Multicast and unicast cooperative data transmission method, server and terminal - Google Patents
Multicast and unicast cooperative data transmission method, server and terminal Download PDFInfo
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- CN110768709A CN110768709A CN201810843890.0A CN201810843890A CN110768709A CN 110768709 A CN110768709 A CN 110768709A CN 201810843890 A CN201810843890 A CN 201810843890A CN 110768709 A CN110768709 A CN 110768709A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/18523—Satellite systems for providing broadcast service to terrestrial stations, i.e. broadcast satellite service
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
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- H04B7/15—Active relay systems
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- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18517—Transmission equipment in earth stations
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- H—ELECTRICITY
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Abstract
The embodiment of the invention provides a multicast and unicast cooperative data transmission method, a server and terminals, wherein the server multicasts multicast data to each terminal in a multicast group through a communication satellite, and all terminals in the multicast group are positioned in the communication range of the communication satellite; and receiving packet loss information returned by each terminal in the multicast group, and respectively sending corresponding lost data packets to each terminal according to the packet loss information returned by each terminal. The method, the server and the terminal realize multicast through the communication satellite, and realize transmission through unicast between the server and the terminal for packet loss data packets occurring in the multicast process, thereby combining the multicast and unicast transmission modes, fully utilizing the network resources of the communication satellite and simultaneously ensuring the reliability of data transmission.
Description
Technical Field
The embodiment of the invention relates to the technical field of communication, in particular to a multicast and unicast cooperative data transmission method, a server and a terminal.
Background
With the development of satellite networks, satellite-based communication has become a hot spot for satellite network services. In the internet, besides 4G/5G/WiFi, the access of the satellite network can enhance the quality experience of the user internet access, and particularly, the satellite network can play an important auxiliary role in ground network coverage blind areas such as remote/ocean areas and the like.
Satellite to ground is a wireless channel, and the coverage area of the satellite is large, so that a large number of user terminals can be covered simultaneously. Due to the characteristics of long delay from the satellite to the ground and a link with a high error rate, when the TCP protocol widely used in the current ground network is applied to the satellite network, the performance of the satellite network is sharply reduced under the characteristics of the link with the high error rate of the satellite network. The limited computational and channel resources of satellites do not provide end-to-end unicast transmission services to a large number of clients simultaneously. The communication satellite is transmitted in a multicast mode by serving as a multicast router, so that wireless channel resources can be effectively utilized, but the reliability of data transmission is not guaranteed.
Disclosure of Invention
In order to overcome the above problems or at least partially solve the above problems, embodiments of the present invention provide a data transmission method, a server, and a terminal for multicast and unicast coordination.
The embodiment of the invention provides a multicast and unicast cooperative data transmission method, which comprises the following steps: multicasting the multicast data to each terminal in a multicast group through a communication satellite, wherein all terminals in the multicast group are positioned in the communication range of the communication satellite; and receiving packet loss information returned by each terminal in the multicast group, and respectively sending corresponding lost data packets to each terminal according to the packet loss information returned by each terminal.
Wherein multicasting the multicast data to each terminal in the multicast group via the communication satellite comprises: sending the multicast group address to each terminal in the multicast group; and sending the multicast data to a communication satellite, wherein each data packet of the multicast data carries a multicast group address so that the communication satellite can transmit the multicast data to the terminal in the communication range, and the terminal can receive the multicast data according to the multicast group address.
Wherein sending the multicast data to the communications satellite comprises: adding a code to each data packet of the multicast data according to a preset coding sequence, wherein the codes in the preset coding sequence are arranged from small to large; each packet is transmitted to the communications satellite in order of the smaller to larger code added to each packet.
The method for receiving the packet loss information returned by each terminal in the multicast group and respectively sending the corresponding lost data packet to each terminal according to the packet loss information returned by each terminal includes the following steps: receiving codes returned by each terminal in the multicast group, wherein the codes returned by each terminal are codes carried by data packets lost by the corresponding terminal; and respectively sending the corresponding lost data packet to each terminal according to the code returned by each terminal.
The embodiment of the invention provides a multicast and unicast cooperative data transmission method, which comprises the following steps: receiving multicast data multicast by a server through a communication satellite; and determining packet loss information, and sending the packet loss information to the server so that the server can return the lost data packet according to the packet loss information.
The method for receiving multicast data multicast by a server through a communication satellite comprises the following steps: receiving a multicast group address sent by a server; and if the data packet transmitted by the communication satellite carries the multicast group address, receiving the data packet transmitted by the communication satellite group as the data packet of the multicast data.
Wherein, determining packet loss information comprises: determining a target code according to a preset coding sequence, wherein the codes in the preset coding sequence are arranged from small to large, the target code is the minimum code in the codes carried by the data packets which are not received in all the data packets of the multicast data, and the code carried by the data packets is the code added by the server to each data packet of the multicast data according to the preset coding sequence; and acquiring the code of the currently received data packet, comparing the code of the currently received data packet with the target code, and taking the target code as packet loss information if the code of the currently received data packet is greater than the target code.
The method for sending the packet loss information to the server so that the server can return the lost data packet according to the packet loss information includes: and sending the target code to the server so that the server returns a data packet corresponding to the target code.
The embodiment of the invention provides a multicast and unicast cooperative data transmission server, which comprises: at least one processor, at least one memory, and a data bus; wherein: the processor and the memory complete mutual communication through a data bus; the memory stores a server side method and any optional embodiment of the method, which can be executed by the processor for the multicast and unicast cooperative data transmission method.
The embodiment of the invention provides a data transmission terminal for cooperation of multicast and unicast, which comprises: at least one processor, at least one memory, and a data bus; wherein: the processor and the memory complete mutual communication through a data bus; the memory stores a terminal side method and any optional embodiment of the method, which can be executed by the processor by the data transmission method of the cooperation of multicast and unicast according to the embodiment of the invention.
According to the data transmission method, the server and the terminals for cooperation of multicast and unicast provided by the embodiment of the invention, the server multicasts multicast data to each terminal in a multicast group through a communication satellite, and all terminals in the multicast group are positioned in the communication range of the communication satellite; and receiving packet loss information returned by each terminal in the multicast group, and respectively sending corresponding lost data packets to each terminal according to the packet loss information returned by each terminal. The method, the server and the terminal realize multicast through the communication satellite, and realize transmission through unicast between the server and the terminal for packet loss data packets occurring in the multicast process, thereby combining the multicast and unicast transmission modes, fully utilizing the network resources of the communication satellite and simultaneously ensuring the reliability of data transmission.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a flowchart of a multicast and unicast cooperative data transmission method according to an embodiment of the present invention;
fig. 2 is a flowchart of a multicast and unicast cooperative data transmission method according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a data transmission server for multicast and unicast coordination according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a data transmission terminal cooperating with multicast and unicast according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An embodiment of the present invention provides a multicast and unicast cooperative data transmission method, and with reference to fig. 1, the method includes: s11, multicasting the multicast data to each terminal in the multicast group through the communication satellite, wherein all terminals in the multicast group are positioned in the communication range of the communication satellite; and S12, receiving the packet loss information returned by each terminal in the multicast group, and respectively sending the corresponding lost data packet to each terminal according to the packet loss information returned by each terminal.
Specifically, the coverage of the communication satellite is large, and wireless communication can be directly performed between the communication satellite and the server, and between the communication satellite and the terminal. The server as the multicast source can directly send the multicast data to the communication satellite, and then the communication satellite forwards the multicast data to the terminals in the multicast group. In this embodiment, the execution main body is a server serving as a multicast source, and the server multicasts multicast data to each terminal in a multicast group through a communication satellite.
Based on the problems of high packet loss rate and poor transmission reliability possibly caused by satellite wireless communication, in the process of receiving multicast data forwarded by a communication satellite, a terminal in a multicast group confirms packet loss information in real time, the packet loss information comprises information of a lost data packet and is sent to a server through a ground network, the server sends the lost data packet to the terminal in a unicast mode through the ground network according to the packet loss information, and the lost data packet is sent to the terminal in time, so that the reliability of data transmission is improved.
In the multicast process, along with the movement of the communication satellite, under the condition that the current communication satellite serving as a multicast router cannot completely cover the terminals in the multicast group, the communication satellite serving as the multicast router cannot provide multicast data forwarding for all the terminals in the multicast group any more, and a substitute communication satellite is searched to substitute the current communication satellite and serve as the multicast router to provide multicast data forwarding for all the terminals in the multicast group, wherein the searched substitute communication satellite needs to ensure that the terminals in the multicast group are all in the communication coverage range of the substitute communication satellite, so that all the terminals in the multicast group can be ensured to finish the reception of the multicast data.
In the multicast process, the terminals also have dynamic joining and leaving multicast groups, namely the data content requested by the new terminal is the same as the data content requested by the terminals in the multicast group, and the new terminal is added into the multicast group; or the terminal in the multicast group does not request the multicast data any more, the terminal which does not request the multicast data any more exits the multicast group. At this time, in combination with the mobile coverage of the communication satellite and the dynamic change of the multicast group, it is necessary to dynamically determine the distribution range of the terminals in the multicast group and select the communication satellite as the multicast router, so as to ensure that the terminals in the multicast group stably complete the reception of multicast data with high quality.
The multicast and unicast cooperative data transmission method of the embodiment realizes multicast through a communication satellite, and realizes transmission through unicast between a server and a terminal for packet loss data packets occurring in the multicast process, so that the multicast and unicast transmission modes are combined, network resources of the communication satellite are fully utilized, and meanwhile, the reliability of data transmission is ensured.
Based on the above embodiment, multicasting the multicast data to each terminal in the multicast group through the communication satellite includes: sending the multicast group address to each terminal in the multicast group; and sending the multicast data to a communication satellite, wherein each data packet of the multicast data carries a multicast group address so that the communication satellite can transmit the multicast data to the terminal in the communication range, and the terminal can receive the multicast data according to the multicast group address.
Specifically, a server sends a multicast group address to a terminal, the server sends multicast data to a communication satellite in a data packet mode, the data packet carries the multicast group address, the communication satellite forwards the data packet from the server, the terminal filters the data packet transmitted by the communication satellite, and when the data packet is confirmed to carry the multicast group address, the data packet is received; through the above procedure, data transmission from the server as a multicast source to the terminals in the multicast group is completed in a multicast manner based on the communication satellite.
Based on the above embodiments, sending multicast data to a communication satellite includes: adding a code to each data packet of the multicast data according to a preset coding sequence, wherein the codes in the preset coding sequence are arranged from small to large; each packet is transmitted to the communications satellite in order of the smaller to larger code added to each packet.
Specifically, for data transmission in a network, data needs to be divided into data packets for transmission, and during the multicast process, multicast data also needs to be transmitted in the form of data packets. In this embodiment, for a data packet, a code is added to each data packet, the code is selected from a preset code sequence, the preset code sequence can be used as a global code sequence, the code is equivalent to an identifier of the data packet, and both the server and the terminal can rapidly locate the data packet through the code under the condition that the code in the preset code sequence is not repeated. For example, the predetermined code sequence may be a series of numbers with a size from small to large, with steps of 1,2,3, …, or with steps that vary according to predetermined rules. The preset coding sequence can reflect the sending sequence of the data packets from the server and the receiving sequence of the data packets from the terminal, and each data packet can be sent to the communication satellite at the server end according to the sequence from small to large of the code added to each data packet.
Based on the above embodiment, receiving packet loss information returned by each terminal in the multicast group, and sending a corresponding lost data packet to each terminal according to the packet loss information returned by each terminal respectively includes: receiving codes returned by each terminal in the multicast group, wherein the codes returned by each terminal are codes carried by data packets lost by the corresponding terminal; and respectively sending the corresponding lost data packet to each terminal according to the code returned by each terminal.
Specifically, at the terminal, the receiving sequence of the data packets may be defined as the sequence of the codes in the preset coding sequence, according to the preset coding sequence, the terminal may determine the codes carried by the lost data packets and return the codes carried by the lost data packets to the server, and the server determines and transmits the data packets that need to be retransmitted to the terminal (i.e., the data packets lost by the terminal) according to the codes.
An embodiment of the present invention further provides a multicast and unicast cooperative data transmission method, where, referring to fig. 2, the method includes: s21, receiving multicast data multicast by the server through the communication satellite; and S22, determining the packet loss information, and sending the packet loss information to the server so that the server can return the lost data packet according to the packet loss information.
Specifically, in this embodiment, the execution subject is any terminal in the multicast group. The method comprises the steps that multicast data are sent to a communication satellite by a server, the multicast data are forwarded by the communication satellite, a terminal receives the multicast data, the terminal confirms packet loss information in real time in the process of receiving the multicast data, the packet loss information comprises information of lost data packets, the packet loss information is sent to the server through a ground network, and the server sends the lost data packets to the terminal through the ground network in a unicast mode according to the packet loss information. The data transmission mode realizes the cooperation of multicast and unicast and improves the reliability of data transmission.
The multicast and unicast cooperative data transmission method of the embodiment realizes multicast through a communication satellite, and realizes transmission through unicast between a server and a terminal for packet loss data packets occurring in the multicast process, so that the multicast and unicast transmission modes are combined, network resources of the communication satellite are fully utilized, and meanwhile, the reliability of data transmission is ensured.
Based on the above embodiment, the receiving server receives multicast data multicast by a communication satellite, including: receiving a multicast group address sent by a server; and if the data packet transmitted by the communication satellite carries the multicast group address, receiving the data packet transmitted by the communication satellite group as the data packet of the multicast data.
Specifically, a server sends a multicast group address to a terminal, the server sends multicast data to a communication satellite in a data packet mode, the data packet carries the multicast group address, the communication satellite forwards the data packet from the server, the terminal filters the data packet sent by the communication satellite, and when the data packet is confirmed to carry the multicast group address, the data packet carrying the multicast group address is received as the data packet of the multicast data; through the above procedure, data transmission from the server as a multicast source to the terminals in the multicast group is completed in a multicast manner based on the communication satellite.
Based on the above embodiment, determining packet loss information includes: determining a target code according to a preset coding sequence, wherein the codes in the preset coding sequence are arranged from small to large, the target code is the minimum code in the codes carried by the data packets which are not received in all the data packets of the multicast data, and the code carried by the data packets is the code added by the server to each data packet of the multicast data according to the preset coding sequence; and acquiring the code of the currently received data packet, comparing the code of the currently received data packet with the target code, and taking the target code as packet loss information if the code of the currently received data packet is greater than the target code.
The method for sending the packet loss information to the server so that the server can return the lost data packet according to the packet loss information includes: and sending the target code to the server so that the server returns a data packet corresponding to the target code.
Specifically, the server adds codes to the data packets according to a preset code sequence, the preset code sequence may be a series of numeric sequences with the numeric values from small to large, the preset code sequence may reflect the sending sequence of the data packets by the server and the receiving sequence of the data packets by the terminal, at the server side, each data packet may be sent to the communication satellite according to the sequence of the added codes from small to large, at the terminal side, the terminal may also receive the data packets according to the sequence of the added codes from small to large, and receive the data packets according to the method, so that the code carried by the data packet that the terminal should currently receive is the minimum code among the codes carried by the data packets that are not received in all the data packets, the code carried by the data packet that the terminal should currently receive is taken as a target code, and if the terminal detects that the code carried by the data packet that the communication satellite currently forwards is smaller than the target code, if the data packet forwarded by the communication satellite currently is received, discarding the data packet; if the terminal detects that the code carried by the data packet forwarded by the communication satellite at present is larger than the target code, indicating that the data packet which the terminal should receive at present is lost, sending the target code to a server as packet loss information; and if the terminal detects that the code carried by the data packet currently forwarded by the communication satellite is equal to the target code, receiving the data packet, and correspondingly modifying the numerical value of the target code, for example, when the step length between codes in the preset coding sequence is 1, adding 1 to the target code on the basis of the original numerical value. By the method, the terminal can detect whether the lost data packet exists in real time and feed back the packet loss information to the server in real time so that the server can send the lost data packet to the terminal in time.
An embodiment of the present invention further provides a multicast and unicast cooperative data transmission server, and with reference to fig. 3, the multicast and unicast cooperative data transmission server includes: at least one processor 31, at least one memory 32 and a data bus 33; wherein: the processor 31 and the memory 32 are communicated with each other through a data bus 33; the memory 32 stores program instructions executable by the processor 31, and the processor 31 calls the program instructions to execute the server-side method of the multicast and unicast cooperative data transmission method according to the embodiment of the present invention and any optional embodiment thereof, including, for example: multicasting the multicast data to each terminal in a multicast group through a communication satellite, wherein all terminals in the multicast group are positioned in the communication range of the communication satellite; and receiving packet loss information returned by each terminal in the multicast group, and respectively sending corresponding lost data packets to each terminal according to the packet loss information returned by each terminal. .
An embodiment of the present invention further provides a data transmission terminal for multicast and unicast cooperation, where, referring to fig. 4, the data transmission terminal includes: at least one processor 41, at least one memory 42, and a data bus 43; wherein: the processor 41 and the memory 42 communicate with each other through a data bus 43; the memory 42 stores program instructions executable by the processor 41, and the processor 41 calls the program instructions to execute the method for transmitting data in cooperation with multicast and unicast according to the embodiment of the present invention on the terminal side and any optional embodiment thereof, including: receiving multicast data multicast by a server through a communication satellite; and determining packet loss information, and sending the packet loss information to the server so that the server can return the lost data packet according to the packet loss information.
An embodiment of the present invention further provides a non-transitory computer-readable storage medium, where the non-transitory computer-readable storage medium stores a computer program, and the computer program enables the computer to execute the server-side method of the multicast and unicast cooperative data transmission method according to the embodiment of the present invention and the method according to any optional embodiment of the server-side method, for example, including: multicasting the multicast data to each terminal in a multicast group through a communication satellite, wherein all terminals in the multicast group are positioned in the communication range of the communication satellite; and receiving packet loss information returned by each terminal in the multicast group, and respectively sending corresponding lost data packets to each terminal according to the packet loss information returned by each terminal. .
An embodiment of the present invention further provides a non-transitory computer-readable storage medium, where the non-transitory computer-readable storage medium stores a computer program, and the computer program enables the computer to execute the terminal-side method of the multicast and unicast cooperative data transmission method according to the embodiment of the present invention and the method according to any optional embodiment thereof, for example, the method includes: receiving multicast data multicast by a server through a communication satellite; and determining packet loss information, and sending the packet loss information to the server so that the server can return the lost data packet according to the packet loss information.
Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to computer program instructions, where the computer program may be stored in a computer readable storage medium, and when executed, the computer program performs the steps including the method embodiments; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, the description is as follows: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A multicast and unicast cooperative data transmission method is characterized by comprising the following steps:
multicasting the multicast data to each terminal in a multicast group through a communication satellite, wherein all terminals in the multicast group are positioned in the communication range of the communication satellite;
and receiving packet loss information returned by each terminal in the multicast group, and respectively sending corresponding lost data packets to each terminal according to the packet loss information returned by each terminal.
2. The method of claim 1, wherein multicasting the multicast data to each terminal in the multicast group via the communication satellite comprises:
sending a multicast group address to each terminal in the multicast group;
and sending multicast data to the communication satellite, wherein each data packet of the multicast data carries the multicast group address, so that the communication satellite can transmit the multicast data to terminals in the communication range, and the terminals can receive the multicast data according to the multicast group address.
3. The method of claim 2, wherein sending the multicast data to the communication satellite comprises:
adding a code to each data packet of the multicast data according to a preset coding sequence, wherein the codes in the preset coding sequence are arranged from small to large;
and transmitting each data packet to the communication satellite in the order of the added codes of each data packet from small to large.
4. The method according to claim 3, wherein the receiving packet loss information returned by each terminal in the multicast group, and sending a corresponding lost data packet to each terminal according to the packet loss information returned by each terminal respectively comprises:
receiving codes returned by each terminal in the multicast group, wherein the codes returned by each terminal are codes carried by data packets lost by the corresponding terminal;
and respectively sending the corresponding lost data packet to each terminal according to the code returned by each terminal.
5. A multicast and unicast cooperative data transmission method is characterized by comprising the following steps:
receiving multicast data multicast by a server through a communication satellite;
and determining packet loss information, and sending the packet loss information to the server so that the server can return a lost data packet according to the packet loss information.
6. The method of claim 5, wherein the receiving server multicasts data via a communication satellite, comprising:
receiving a multicast group address sent by the server;
and if the data packet transmitted by the communication satellite carries the multicast group address, receiving the data packet transmitted by the communication satellite group as the data packet of the multicast data.
7. The method of claim 5, wherein the determining packet loss information comprises:
determining target codes according to a preset coding sequence, wherein the codes in the preset coding sequence are arranged from small to large, the target codes are the minimum codes in the codes carried by the data packets which are not received in all the data packets of the multicast data, and the codes carried by the data packets are the codes added to each data packet of the multicast data by the server according to the preset coding sequence;
and acquiring the code of the currently received data packet, comparing the code of the currently received data packet with the target code, and if the code of the currently received data packet is larger than the target code, taking the target code as the packet loss information.
8. The method according to claim 7, wherein the sending the packet loss information to the server for the server to return a lost data packet according to the packet loss information comprises:
and sending the target code to the server so that the server returns a data packet corresponding to the target code.
9. A multicast and unicast cooperative data transmission server, comprising:
at least one processor, at least one memory, and a data bus; wherein:
the processor and the memory complete mutual communication through the data bus; the memory stores program instructions executable by the processor, the processor calling the program instructions to perform the method of any of claims 1 to 4.
10. A terminal for multicast and unicast coordination, comprising:
at least one processor, at least one memory, and a data bus; wherein:
the processor and the memory complete mutual communication through the data bus; the memory stores program instructions executable by the processor, the processor calling the program instructions to perform the method of any of claims 5 to 8.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111371488A (en) * | 2020-03-13 | 2020-07-03 | 北京邮电大学 | Content data transmission method and device and electronic equipment |
| CN114944861A (en) * | 2022-04-08 | 2022-08-26 | 亚太卫星宽带通信（深圳）有限公司 | Multicast baseband configuration system and method |
| WO2023109891A1 (en) * | 2021-12-17 | 2023-06-22 | 华为技术有限公司 | Multicast transmission method, apparatus and system |
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