CN110943765A - Millimeter wave and microwave hybrid relay transmission assisting system based on network coding - Google Patents
Millimeter wave and microwave hybrid relay transmission assisting system based on network coding Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
- H04B7/15592—Adapting at the relay station communication parameters for supporting cooperative relaying, i.e. transmission of the same data via direct - and relayed path
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04L63/04—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks
- H04L63/0428—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the data content is protected, e.g. by encrypting or encapsulating the payload
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- H04L67/00—Network arrangements or protocols for supporting network services or applications
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Abstract
A millimeter wave and microwave hybrid relay transmission assistance system based on network coding comprises: a macro base station, a relay base station and a terminal device; the macro base station and the relay base station both comprise large-scale MIMO millimeter waves; the communication mode of the macro base station comprises millimeter wave communication and microwave communication; the relay base station works in a full duplex mode; in the process that the terminal equipment downloads a plurality of files from the core network at the same time, an encrypted file is directly transmitted to the terminal equipment from the macro base station through microwave communication, data packets transmitted to the relay base station from the macro base station and data packets transmitted to the terminal equipment from the relay base station are transmitted by millimeter waves, and the data packets are subjected to network coding. The invention can not only improve the safety and privacy of data transmission, but also increase the transmitted data volume when necessary, thereby improving the working efficiency, stability and safety of the transmission process of downloading files by the terminal equipment.
Description
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a relay base station, a chain communication network, and a network coding technology commonly used in a mobile cellular network, and also relates to an MEC (mobile edge cache, hereinafter referred to as MEC or edge cache), and in particular, to a millimeter wave and microwave hybrid relay transmission assistance system based on network coding.
Background
The relay is a functional mode for bearing communication between two points, and can receive and amplify a signal from a previous communication point and then transfer the signal to a next communication point, and has respective applications in many different industry fields. In a cellular network, a "Relay" specifically refers to a wireless Relay Station (Relay Station), also called a repeater, and is a bidirectional radio frequency, common frequency, and broadband linear amplification Relay device. It receives and transmits signals from macro Base Station and Mobile Station, and is used to assist the macro Base Station (Base Station) to solve the communication in shadow area, blind area, dead angle and tunnel caused by terrain or man-made obstacle in the communication network of cellular Mobile phone, and improve the communication quality of Mobile Station (Mobile Station).
The relay cellular network is a product of merging a relay technology, a multi-hop structure and a traditional cellular network. In a traditional cellular network architecture, a relay base station is introduced, and a multi-hop link is used, so that a mobile terminal can be connected with the base station through one or more relay stations, thereby enhancing cell coverage, improving throughput and resisting channel fading. Cellular network relays are widely used in today's cellular networks because they are functionally close to macro base stations, but are less expensive than macro base stations in cost, and are very flexible. The concrete practical significance comprises: (1) the method is used for improving the communication performance of cell terminal equipment, (2) increasing the system capacity, (3) expanding the cell coverage, (4) eliminating coverage blind spots in the cell, (5) providing the communication coverage of buildings, tunnels and underground communication sites, and (6) providing temporary emergency communication.
The relay base station is a base station which is quite common and used in the cellular network of today, and can be flexibly combined with other network technologies due to the specific advantages of the relay base station, so that more efficient communication schemes can be realized. Especially for millimeter wave communication, due to the fast attenuation of millimeter waves, cooperation by relay devices is required to extend the transmission distance and serve different application scenarios under certain schemes.
Network coding is a research hotspot which is emerging in recent years. The conventional coding idea focuses on the source side, or the main work of coding is borne by the source. The core idea of network coding is to allow a network intermediate node to re-code different information streams into one information stream, which breaks the theoretical limitation that independent irrelevant bit information cannot be compressed any more, and it can be considered that network coding is a more generalized routing technology of traditional store-and-forward.
Network coding is the linear or non-linear processing of information received on various channels at various nodes in a network, and then forwarding to downstream nodes, with intermediate nodes playing the role of encoders or signal processors. The traditional mode of transmitting data by communication network nodes is store-and-forward, that is, nodes except a sending node and a receiving node of the data are only responsible for routing without any processing on data content, an intermediate node plays the role of a repeater, network coding changes the role of the traditional node, and data is coded and processed on the node, so that the method is an effective method for improving network throughput, robustness and safety, and is developed and combined in the fields of wireless networks, P2P systems, distributed file storage, network safety and the like at present.
The basic idea is described below with a typical example of network coding: as shown in fig. 1, a single-source, two-sink multicast network. Suppose that two information streams u are transmitted from a1,u2To the sink end F and G, each point-to-point link is error-free and has a maximum capacity of '1'.
To implement multicast, a conventional routing mechanism is shown in fig. 2, where the dashed line represents the information flow u1The solid line represents the information flow u2Is transmitted. It can be seen that the link from D to E is used twice, limited by the capacity of the link from D to E, i.e. the "network bottleneck".
If network coding is adopted, the routing strategy is redesigned. As shown in FIG. 3, the node D fuses u1 and u2 information flows1⊕u2And sending out the fused information stream. The signal host end F receives u1⊕u2And u1 by calculating u2＝u1⊕u2⊕u1To obtain u 2; similarly, u1 was also obtained from primary host G. Thus, the D-to-E link reduces the transmission of one information stream and avoids the link bottleneck between D, E well.
As can be seen from this example, if network-coded routing is not performed at the D-node, and queuing for storage is necessary for conventional routing, the sink end can receive only 1.5 information streams per time slot on average. After network coding is carried out, the throughput of the whole network is also improved, and each sink terminal can receive 2 information streams simultaneously.
The above-mentioned scheme is the simplest and most efficient scheme in network coding, but the most basic idea of actual network coding is to perform coding operation of a linear equation on a galois field according to a certain mapping rule on a received data packet, and it is a coding result and a coding coefficient vector to forward an original data packet after coding. When the information sink node receives enough linear uncorrelated coding vectors, the inverse operation can be completed on the Galois field and the original data can be obtained through mapping return.
From the current research results, the advantages of network coding include: (1) the method comprises the steps of (1) improving network throughput, (2) balancing network load, (3) improving bandwidth utilization rate, and (4) improving network robustness.
Network coding can bring great promotion to the overall operation efficiency of the network, and as the network coding can increase the workload of the network to a certain extent, increase the operation complexity and bring greater overhead, the network coding has not been widely applied to the ground in recent years, and a great number of students still research how to realize the network coding technology to the ground better, conveniently and efficiently.
The xor scheme of the network coding in the example is actually the simplest scheme of the linear equation coding, and although the xor scheme has application limitation in the overall huge network environment, the xor scheme has quite high convenience, high efficiency and feasibility in an independent partial model, and is therefore very suitable for being combined with other network technologies to generate a new and efficient communication scheme.
MIMO (Multiple-Input Multiple-Output) technology, that is, Multiple-Input Multiple-Output technology, refers to using Multiple transmitting antennas and Multiple receiving antennas at a transmitting end and a receiving end, respectively, so that signals are transmitted and received through the Multiple antennas at the transmitting end and the receiving end, thereby improving communication quality. The technology can make full use of space resources, and improve the system channel capacity by times under the condition of not increasing frequency spectrum resources and antenna transmitting power.
However, the current wireless data demand is exponentially increased, and thus massive MIMO technology is proposed. The massive MIMO means that the number of base station antennas is huge, and the user terminal adopts a communication mode of single antenna reception. In this way, the user terminal equipment does not need to be updated in a large area, and the utilization rate of the system frequency spectrum can be improved only by modifying the base station. The specific architecture is shown in fig. 4.
The features and advantages of massive MIMO can be summarized in several ways:
(1) and the communication capacity is improved. The large-scale MIMO has the characteristic of beam space multiplexing, so that communication of different terminals is realized through different geographic positions under the same frequency and the same time, and the frequency spectrum efficiency is greatly improved through the mode;
(2) reduction in complexity of the terminal. The large-scale MIMO technology requires that all complex processing operations are carried out at the base station, so that the complexity of terminal equipment is reduced, and the cost of the terminal is reduced;
(3) coverage and power consumption improvements. Generally, the power consumption of a communication device is proportional to the coverage area, and in a 4G network, because the number of antennas is small and the gain is small, in order to meet a certain cell coverage area, a radio frequency component with very high power and a matched heat dissipation device are generally required, and the power consumption is very high. The large-scale MIMO technology is utilized, the number of antennas is large, the gain is large, relatively speaking, the required radio frequency component is in the milliwatt level, and the power consumption is greatly reduced;
(4) a reduction in interference. In large-scale MIMO, the beam forming technology is widely used, so that the beam can be aligned in a narrow target range, thereby greatly reducing interference and improving communication quality.
Meanwhile, millimeter wave communication has been paid attention and researched along with the development of 5G technology in recent years, and millimeter wave communication has several important advantages:
(1) the millimeter wave frequency range is 26.5-300 GHz, and the bandwidth is up to 273.5 GHz. More than 10 times the total bandwidth from dc to microwave. Even if atmospheric absorption is considered, only four main windows can be used for propagation in the atmosphere, but the total bandwidth of the four windows can reach 135GHz, which is 5 times of the sum of the bandwidths of the bands below the microwave.
(2) The beam of millimeter waves is much narrower than that of microwaves under the same antenna size, and the side lobe is low. For example, for a 12cm antenna, the beam width is 18 degrees at 9.4GHz and the wave speed width is only 1.8 degrees at 94 GHz. Thus, small objects that are closer together can be resolved or the details of the objects viewed more clearly.
(3) Millimeter waves may utilize a broad spectrum of broadband capabilities to suppress multipath effects and clutter. Because a large number of frequencies are available, the mutual interference can be effectively eliminated. Under the target radial velocity, larger Doppler frequency shift can be obtained, so that the detection and identification capability of a low-speed moving object or a vibrating object is improved.
However, millimeter waves have the disadvantages of large signal attenuation, short coverage distance, easy blockage and the like.
The invention relates to a novel macro base station BS and a novel relay base station RS which are constructed by the large-scale MIMO millimeter wave and network coding technology in an interfusion manner, and provides a cooperative system for safely transmitting the large-scale MIMO millimeter wave and the network coding in relay data based on a beam forming technology. In the process of downloading the file from the core network, the application scheme is added to the macro base station BS and the relay base station RS which are close to the edge side of the user, so that the safety and privacy of data transmission can be improved, and the transmitted data volume can be increased when necessary, so that the working efficiency, stability and safety of the process of downloading the file by the terminal equipment are improved.
Disclosure of Invention
The millimeter wave and microwave hybrid relay transmission assisting system based on network coding can fully play the utilization rate of millimeter wave channel and microwave channel resources and improve the safety privacy and transmission stability of transmission at the sides of a macro base station and a relay base station close to a user in the process of downloading and transmitting files from a core network by terminal equipment, thereby improving the operation efficiency of the whole network and improving the robustness.
The invention adopts the following technical scheme:
a millimeter wave and microwave hybrid relay transmission assistance system based on network coding comprises: a macro base station, a relay base station and a terminal device; the macro base station and the relay base station respectively comprise a large-scale MIMO millimeter wave and a data storage function module; the communication mode of the macro base station comprises millimeter wave communication and microwave communication; the relay base station works in a full duplex mode; when the terminal equipment downloads a plurality of files from a core network simultaneously, file data are transmitted to the relay base station from the core network through the macro base station and are finally transmitted to the terminal equipment; in the file data transmission process, an encrypted file is directly transmitted to terminal equipment from a macro base station through microwave communication, data packets transmitted from the macro base station to the relay base station and data packets transmitted from the relay base station to the terminal equipment are transmitted by millimeter waves, and the data packets comprise data for network coding of the file data and the encrypted file.
Preferably, the encrypted file is an encrypted data packet obtained by performing network coding operation on the normal communication millimeter wave beam information and the PDCP layer key.
Preferably, the encrypted file is an encrypted data packet obtained by performing a network coding operation on a certain file data packet and a PDCP layer key.
Preferably, the relay base station supports an amplify-and-forward relay and a decode-and-encode relay.
Preferably, when the relay base station adopts decoding coding type relay, the encrypted file is split into a plurality of sub-files x1, x2, x3 and …; the N-1 download files comprise A, B, C and …, each download file is divided into m sub-files which are a1, a2, a3 and … respectively; b1, b2, b3, …; c1, c2, c3, …;
the file downloading process specifically comprises the following steps:
the macro base station transmits N data packets ' a1 ⊕ b1 ⊕ … ⊕ x1 ', ' a1 ⊕ x1 ', ' b1 ⊕ x1 ', ' c1 ⊕ x1 ' and ' … ' to the relay base station in a time slot 1, transmits the data packets ' x1 ' to the terminal equipment by using microwaves, and the relay base station receives the N data packets and obtains ' a1 ', ' b1 ', ' c1 ', … ' and ' x1 ' in an exclusive-or network coding and decoding operation mode;
the macro base station continues to send the data file of the time slot to the relay base station according to a set mode, namely sends N data packets "a 2 ⊕ b2 ⊕ … ⊕ x 2", "a 2 ⊕ x 2", "b 2 ⊕ x 2", "c 2 ⊕ x 2" and … to the relay base station, and sends "x …" to the terminal equipment by microwaves, the relay base station receives the N data packets and obtains "a …", "b …", "c …", … "and" x … "respectively in an exclusive-or network coding and decoding operation mode, meanwhile, the relay base station not only needs to receive the data packets, but also needs to send the data packets obtained in the last time slot, and still uses the network coding to operate and send N-1 data packets" a … x … "," b … x … "," c … x … "and … to the terminal equipment, and at this time, the terminal equipment can complete the decoding operation of the network coding for the received data packets, and finally obtains the data packets" x … "… a" and "… c", which are transmitted smoothly;
in the subsequent time slot, the step of the time slot 2 is repeated until the file downloading is completed.
Preferably, when the relay base station relays in an amplification forwarding mode, the encrypted file is split into a plurality of sub-files x1, x2, x3 and …; the N-1 download files comprise A, B, C and …, each download file is divided into m sub-files which are a1, a2, a3 and … respectively; b1, b2, b3, …; c1, c2, c3, …;
the file downloading process specifically comprises the following steps:
the macro base station transmits N-1 data packets ' a1 ⊕ x1 ', ' b1 ⊕ x1 ', ' c1 ⊕ x1 ', … ' to the relay base station in a time slot 1, transmits the data packets ' x1 ' to the terminal equipment by using microwaves, and the relay base station receives the N data packets and respectively obtains ' a1 ', ' b1 ', ' c1 ', … ', x1 ' in an exclusive-or network coding and decoding operation mode;
the macro base station continues to send the data file of the time slot to the relay base station according to a predetermined mode, that is, N-1 data packets "a 2 ⊕ x 2", "b 2 ⊕ x 2", "c 2 ⊕ x 2", … are sent to the relay base station by microwaves, the relay base station receives the N data packets and obtains "a 2", "b 2", "c 2", … "x 2" respectively by using an exclusive-or network coding and decoding operation, meanwhile, the relay base station not only needs to receive the data packets, but also needs to send the data packets obtained in the previous time slot, and still uses the network coding to operate and send the N-1 data packets "a 1 ⊕ x 1", "b 1 ⊕ x 1", "c 1 ⊕ x 1", 1 to the terminal device, and at this time, the terminal device can complete the decoding operation of the network coding for the received data packets in combination with the "x 1" obtained in the previous time slot, and finally obtains the download operations of the data packets "a 1 a" and "1 c" of the file 1, 1 ", and" 1 c ";
in the subsequent time slot, the step of the time slot 2 is repeated until the file downloading is completed.
As can be seen from the above description of the present invention, compared with the prior art, the present invention has the following advantages:
(1) according to the millimeter wave and microwave hybrid relay transmission assisting system based on network coding, network coding is used for cooperation in microwave communication and large-scale MIMO millimeter wave communication, stability guarantee and efficient privacy protection can be achieved for data transmission of a wireless end of a user in the process of downloading a plurality of files simultaneously, channel resources can be fully utilized, accordingly, data privacy safety and transmission efficiency of edge wireless relay are synchronously improved, and privacy and efficiency of a network are optimized on the basis of keeping an original transmission process;
(2) the network coding is added for improving the security and privacy of data on one hand, so that even if a data packet is intercepted by a hacker, part of the data packet is difficult to decode on the other hand, the encryption file is used for improving the stability of data transmission, and the encryption file can be flexibly arranged into a certain data file or a file encrypted by millimeter wave beam information and PDCP layer key network coding according to the transmission requirement, so that the condition in network transmission is flexibly met, and the transmission stability is improved or the transmission capacity is expanded.
The present invention will be described in further detail with reference to the accompanying drawings and embodiments, but the millimeter wave and microwave hybrid relay transmission assisting system based on network coding is not limited to the embodiments.
Drawings
FIG. 1 is a schematic diagram of a prior art single source, dual sink, error free network;
fig. 2 is a diagram illustrating a conventional routing mechanism for solving the problem of single-source two-sink multicast in the prior art;
FIG. 3 is a diagram illustrating a prior art single-source two-sink multicast routing strategy using network coding;
FIG. 4 is a diagram of a prior art massive MIMO architecture;
FIG. 5 is a diagram illustrating data transmission according to an embodiment of the present invention;
fig. 6 is a schematic diagram of data transmission of a decoding and encoding type relay-operating timeslot 1 according to an embodiment of the present invention;
fig. 7 is a schematic diagram of data transmission of a decoding and encoding type relay-operating timeslot 2 according to an embodiment of the present invention;
fig. 8 is a schematic diagram of data transmission of decoding and encoding type relay-operating timeslot 3 according to an embodiment of the present invention;
fig. 9 is a schematic diagram of data transmission of decoding and encoding type relay-operating timeslot 4 according to an embodiment of the present invention;
fig. 10 is a diagram illustrating data transmission in an amplify-and-forward relay-active timeslot 1 according to an embodiment of the present invention;
fig. 11 is a diagram illustrating data transmission of an amplify-and-forward relay-work timeslot 2 according to an embodiment of the present invention;
fig. 12 is a diagram illustrating data transmission of an amplify-and-forward relay-active timeslot 3 according to an embodiment of the present invention;
fig. 13 is a diagram illustrating data transmission of an amplify-and-forward relay-active timeslot 4 according to an embodiment of the present invention.
Detailed Description
The invention is further described below by means of specific embodiments.
Referring to fig. 5, the present embodiment takes three download files as an example for explanation. The file A/B/C is a file which is currently downloaded by a terminal device user in communication at the moment, and can download and transmit at most (the number of terminal device antennas is-1) files at the same time;
the encryption file X is set as millimeter wave beam information or an urgent but less important privacy file according to the required content of the scene, network coding encryption is carried out on the encryption file X and a PDCP layer secret key, and then microwave communication is used for carrying out remote transmission, so that the privacy of the important file can be improved, and other millimeter wave transmission files can be coded and encrypted by utilizing the file, and the safety privacy and the transmission stability of the whole scene are improved. Certainly, the encrypted file X may also be set as an encrypted data packet obtained by performing network coding operation on a file data packet which is relatively urgent but not very private and a PDCP layer key, and microwave transmission is used, so that when the channel quality is good, millimeter wave communication is smooth, but a sudden urgent file needs to be transmitted, the X of the scene may be used, thereby improving transmission efficiency and increasing transmission capacity under the premise of good channel environment. The above two types of content settings of X can be switched according to the real-time situation of the network.
In the figure, the circles represent transmitted data packets, which are all network-coded data packets, and only X is transmitted to the terminal equipment UE by microwave alone;
the relay base station RS operates in the full duplex mode, and is applicable to both the amplification forwarding type and the decoding coding forwarding type relays (if the amplification forwarding type is adopted, the broken line "a ⊕ b ⊕ x" link is deleted).
Further, referring to fig. 6 to 9, when the relay base station employs decoding and coding type relay, the operation process of each timeslot in file downloading is as follows:
in the time slot 1, the macro base station BS sends four data packets "a 1 ⊕ b1 ⊕ X1", "a 1 ⊕ X1", "b 1 ⊕ X1", "c 1 ⊕ X1" to the RS, and transmits a data packet "X1" to the terminal equipment user UE by using microwaves (if the channel quality is not good or the terrain of the area is complex, and there is a probability that the millimeter wave beam is lost, the X file is a file encrypted by the millimeter wave beam information and the PDCP layer key xor network code), and if the channel quality is good, the millimeter waves can be stably transmitted and a file encrypted by the temporary emergency is needed, the X file is a file encrypted by the PDCP layer key xor network code), at this time, the RS receives four data packets, which can respectively obtain "a 1", "b 1", "c 1" and "X1" by the xor network code decoding operation, so that not only the data transmission which is originally required is completed, but also the security of the "BS-RS" segment is increased, and the UE can obtain X1 as soon as possible and since the PDCP layer xor network code is the encrypted and the HSS card which is lost, the security of the data transmission can be recovered from each other, so that the security of the original beam transmission can be recovered, and the security of the ip beam transmission can be recovered (if the security of the UE is also obtained, the security of the ip beam transmission is.
In the time slot 2, the macro base station BS continues to send the data file of the time slot in the predetermined manner, that is, send "a 2 ⊕ b2 ⊕ x 2", "a 2 ⊕ x 2", "b 2 ⊕ x 2" and "c 2 ⊕ x 2" to the RS, send "x 2" to the UE by using microwaves, and the RS may decode and obtain "a 2", "b 2", "c 2" and "x 2" by using the network coding, at the same time, the relay base station RS needs to receive not only the data packet but also the data packet obtained in the previous time slot, and still use the network coding to operate and retransmit "a 1 ⊕ x 1", "b 1 ⊕ x 1" and "c 1 ⊕ x 1" to the terminal device user UE, and at this time, the UE may complete the decoding operation of the exclusive or network coding in combination with "x 1" obtained in the previous time slot for the received data packet, and finally obtain the download and transmission of the data packets "a" 1 "," b1 "and" c1 "of the file A, B, C successfully, because the network coding also adds the" of the data file, thereby ensuring the security of the wireless communication under the original RS, and ensuring the security of the wireless communication under the.
The time slots 3, 4 and the following time slots are continued with reference to the operation manner as the time slot 2, and are not described again here.
Further, referring to fig. 10 to 13, when the relay base station uses an amplify-and-forward relay, the working process of each time slot in the file download is as follows:
since the RS is an amplify-and-forward relay base station and does not have the capability of decoding and encoding, the transmission of the a ⊕ b ⊕ x data link in the BS-RS segment in fig. 6 to 9 is omitted, at this time, the RS only needs to be responsible for directly forwarding three data packets from the BS to the UE, and the UE performs xor network encoding and decoding on the current three data packets in combination with the x of the previous time slot to successfully obtain the a, b, and c data packets.
The above is a specific working implementation flow of the invention, and network coding is used for cooperation in microwave communication and large-scale MIMO millimeter wave communication, so that stability of data transmission at a wireless end of a user can be guaranteed and efficient privacy protection can be achieved in the process of downloading a plurality of files simultaneously, channel resources can be fully utilized, data privacy security and transmission efficiency of edge wireless relay are synchronously improved, and privacy and efficiency of a network are optimized on the basis of keeping an original transmission process.
The above description is only an embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modifications made by using the design concept should fall within the scope of infringing the present invention.
Claims (6)
1. A millimeter wave and microwave hybrid relay transmission assistance system based on network coding is characterized by comprising: a macro base station, a relay base station and a terminal device; the macro base station and the relay base station respectively comprise a large-scale MIMO millimeter wave and a data storage function module; the communication mode of the macro base station comprises millimeter wave communication and microwave communication; the relay base station works in a full duplex mode; when the terminal equipment downloads a plurality of files from a core network simultaneously, file data are transmitted to the relay base station from the core network through the macro base station and are finally transmitted to the terminal equipment; in the file data transmission process, an encrypted file is directly transmitted to terminal equipment from a macro base station through microwave communication, data packets transmitted from the macro base station to the relay base station and data packets transmitted from the relay base station to the terminal equipment are transmitted by millimeter waves, and the data packets comprise data for network coding of the file data and the encrypted file.
2. The millimeter wave and microwave hybrid relay transmission assisting system based on network coding as claimed in claim 1, wherein the encrypted file is an encrypted data packet obtained by performing network coding operation on normal communication millimeter wave beam information and a PDCP layer key.
3. The millimeter wave and microwave hybrid relay transmission assisting system based on network coding as claimed in claim 1, wherein the encrypted file is an encrypted data packet obtained by performing a network coding operation on a certain file data packet and a PDCP layer key.
4. The network coding-based millimeter wave and microwave hybrid relay transmission assisting system according to claim 1, wherein the relay base station supports amplify-and-forward type relay and decode-and-encode-and-forward type relay.
5. The millimeter wave and microwave hybrid relay transmission assisting system based on network coding as claimed in claim 4, wherein when the relay base station adopts decoding coding type relay, the encrypted file is split into several sub-files x1, x2, x3, …; the N-1 download files comprise A, B, C and …, each download file is divided into m sub-files which are a1, a2, a3 and … respectively; b1, b2, b3, …; c1, c2, c3, …;
the file downloading process specifically comprises the following steps:
the macro base station transmits N data packets ' a1 ⊕ b1 ⊕ … ⊕ x1 ', ' a1 ⊕ x1 ', ' b1 ⊕ x1 ', ' c1 ⊕ x1 ' and ' … ' to the relay base station in a time slot 1, transmits the data packets ' x1 ' to the terminal equipment by using microwaves, and the relay base station receives the N data packets and obtains ' a1 ', ' b1 ', ' c1 ', … ' and ' x1 ' in an exclusive-or network coding and decoding operation mode;
the macro base station continues to send the data file of the time slot to the relay base station according to a set mode, namely sends N data packets "a 2 ⊕ b2 ⊕ … ⊕ x 2", "a 2 ⊕ x 2", "b 2 ⊕ x 2", "c 2 ⊕ x 2" and … to the relay base station, and sends "x …" to the terminal equipment by microwaves, the relay base station receives the N data packets and obtains "a …", "b …", "c …", … "and" x … "respectively in an exclusive-or network coding and decoding operation mode, meanwhile, the relay base station not only needs to receive the data packets, but also needs to send the data packets obtained in the last time slot, and still uses the network coding to operate and send N-1 data packets" a … x … "," b … x … "," c … x … "and … to the terminal equipment, and at this time, the terminal equipment can complete the decoding operation of the network coding for the received data packets, and finally obtains the data packets" x … "… a" and "… c", which are transmitted smoothly;
in the subsequent time slot, the step of the time slot 2 is repeated until the file downloading is completed.
6. The millimeter wave and microwave hybrid relay transmission assisting system based on network coding as claimed in claim 4, wherein the relay base station splits the encrypted file into several sub-files x1, x2, x3, … when relaying in an amplification forwarding manner; the N-1 download files comprise A, B, C and …, each download file is divided into m sub-files which are a1, a2, a3 and … respectively; b1, b2, b3, …; c1, c2, c3, …;
the file downloading process specifically comprises the following steps:
the macro base station transmits N-1 data packets ' a1 ⊕ x1 ', ' b1 ⊕ x1 ', ' c1 ⊕ x1 ', … ' to the relay base station in a time slot 1, transmits the data packets ' x1 ' to the terminal equipment by using microwaves, and the relay base station receives the N data packets and respectively obtains ' a1 ', ' b1 ', ' c1 ', … ', x1 ' in an exclusive-or network coding and decoding operation mode;
the macro base station continues to send the data file of the time slot to the relay base station according to a predetermined mode, that is, N-1 data packets "a 2 ⊕ x 2", "b 2 ⊕ x 2", "c 2 ⊕ x 2", … are sent to the relay base station by microwaves, the relay base station receives the N data packets and obtains "a 2", "b 2", "c 2", … "x 2" respectively by using an exclusive-or network coding and decoding operation, meanwhile, the relay base station not only needs to receive the data packets, but also needs to send the data packets obtained in the previous time slot, and still uses the network coding to operate and send the N-1 data packets "a 1 ⊕ x 1", "b 1 ⊕ x 1", "c 1 ⊕ x 1", 1 to the terminal device, and at this time, the terminal device can complete the decoding operation of the network coding for the received data packets in combination with the "x 1" obtained in the previous time slot, and finally obtains the download operations of the data packets "a 1 a" and "1 c" of the file 1, 1 ", and" 1 c ";
in the subsequent time slot, the step of the time slot 2 is repeated until the file downloading is completed.
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