CN111064509B - Access system for ultraviolet light communication network and method thereof - Google Patents
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Abstract
An access system and its method for ultraviolet light communication network, include in the space of local area network of the ultraviolet light communication, any ultraviolet light communication node as the communication terminal of ultraviolet light needs to transmit information, the said ultraviolet light communication node shows and gives out light or not to give out light independently; according to the dominant state or the invisible state respectively represented by the light emitting or non-light emitting of the ultraviolet light communication node as the ultraviolet light communication terminal, the state of the whole ultraviolet light communication network is formed by the principle of light superposition, and the competitive access channel is carried out on the basis. By combining with other structures or methods, the basic mechanism, frame structure definition, protocol flow and other aspects of conflict-free competitive access in the prior art are effectively avoided, and the defects of competition and conflict during multi-node access in networking application of an ultraviolet communication terminal in the prior art are effectively avoided.
Description
Technical Field
The present invention relates to the field of wireless optical communication technology and networking technology, and in particular, to an access system and method for an ultraviolet light communication network, and more particularly, to a collision-free contention access system and method for an ultraviolet light communication network.
Background
As a novel communication technology, the wireless optical communication has the advantages of optical fiber communication and mobile communication, can realize broadband transmission, is flexible in networking, does not need frequency application, resists electromagnetic interference, has good confidentiality, and is widely valued in the research of the wireless optical communication nowadays. Specifically, wireless optical communication is a communication technique in which light is used as a carrier and free space is used as a transmission channel. Compared with the traditional radio communication, the method has the advantages of no need of frequency permission, wide frequency band, good confidentiality, electromagnetic interference resistance and the like.
Ultraviolet communication is a new communication mode of wireless optical communication, and information transmission is performed by using the scattering of ultraviolet light in the atmosphere. The wavelength range of the ultraviolet light is 10-400 nm, the ultraviolet light is divided into UVA, UVB and UVC, and the UVA, the UVB and the UVC correspond to the wavelength ranges of 315-400 nm, 280-315 nm and 10-280 nm respectively. Wherein, the solar radiation of UVC wave band is absorbed by ozone molecule, is called as solar blind area, can be used to realize ultraviolet light communication. The ultraviolet light has short wavelength, is strongly influenced by atmospheric scattering in the transmission process, is mainly influenced by Rayleigh scattering and Mie scattering, and the scattering propagation path can bypass obstacles to realize non-direct-view communication, so that the ultraviolet light can be used in scenes such as many battlefield obstacles, complex operation environment, strong operation concealment and the like, and has important military application value.
The ultraviolet light communication mainly has the characteristics of low eavesdropping rate, strong anti-interference capability, omnidirectionality, non-direct-view communication, all-weather work and the like. By utilizing the advantages of the ultraviolet light communication, a novel ultraviolet light communication network can be constructed. The network has the excellent characteristics of no center, self-organization, dynamic change of a network topological structure, multi-hop routing, distributed control, good network robustness and the like.
However, the real practical application of uv communication and networking still faces some technical obstacles, which are mainly reflected in: the key ultraviolet communication device and the performance thereof need to seek technical breakthrough, which depends on the breakthrough of basic research such as materials and the like and is difficult to solve in a short time; on the other hand, an effective networking protocol and a flexible access mechanism required by networking access of the ultraviolet communication terminal become main technical bottlenecks, and research breakthrough can be realized through efforts in a short time.
In recent years, people have been trying to study networking of ultraviolet light communication by referring to protocols and mechanisms related to ad hoc networks in radio communication. However, the ultraviolet light communication has characteristics different from the conventional radio communication in terms of communication distance, bandwidth, the number of channels, scattering propagation, and the like. The basic protocol model of the wireless ad hoc network cannot be carried, and a novel networking access protocol mechanism needs to be designed according to the physical characteristics and the technical characteristics of ultraviolet light communication.
Two general ways for accessing a communication terminal to a network are: first, based on a non-contention time division multiplexing scheme, each terminal allocates a corresponding fixed time slot in advance or as needed to implement communication, thereby avoiding contention conflicts. The method has the advantages of simplicity and reliability, and has the disadvantages of possible communication resource waste; another scheme is a contention channel-based collision avoidance scheme, and each terminal may randomly access the network as needed, which may cause communication collision, and a relatively complex collision detection or collision avoidance mechanism needs to be designed, which may eventually degrade network performance.
Disclosure of Invention
In order to solve the above problems, the present invention provides an access system and method for an ultraviolet light communication network, which mainly relates to the basic mechanism, frame structure definition, protocol flow and other aspects of conflict-free contention access, and effectively avoids the contention and conflict defects of multi-node access in the networking application of an ultraviolet light communication terminal in the prior art.
In order to overcome the defects in the prior art, the invention provides a solution for an access system and a method thereof for an ultraviolet light communication network, which comprises the following steps:
as mentioned above, the access of the terminal networking is sometimes divided into two types, i.e. multiplexing and contention access. The non-contention based time division multiplexing scheme is simple and reliable, but has the defects of communication resource waste, insufficient flexibility in resource allocation and the like, which is not suitable for an ultraviolet light communication network with relatively short bandwidth resources and flexible and variable access node number. Therefore, the present invention proposes a collision-free contention access method similar to the "optical bus with priority" based on the second approach, i.e., a contention-channel-based collision avoidance scheme.
A method for an access system of an ultraviolet light communication network, comprising:
in the space of a local area network for ultraviolet communication, when any ultraviolet communication node serving as an ultraviolet communication terminal needs to transmit information, the ultraviolet communication node is independently luminous or does not emit light;
according to the dominant state or the invisible state respectively represented by the light emitting or non-light emitting of the ultraviolet light communication node as the ultraviolet light communication terminal, the state of the whole ultraviolet light communication network is formed by the principle of light superposition, and the competitive access channel is carried out on the basis.
The principle of superposition of light includes: in n ultraviolet light communication nodes, as long as one ultraviolet light communication node emits light, all nodes in the communication range of the ultraviolet light communication node can detect and judge that the space channel state of the ultraviolet light communication network is an optical signal, and the state is called a dominant state; similarly, in n ultraviolet light communication nodes, only when all the ultraviolet light communication nodes do not emit light, all the ultraviolet light communication nodes in the communication range can detect and judge that the channel state is no signal light, and the channel state is a hidden state; when the space channel state of the existing ultraviolet light communication network is light, no matter the ultraviolet light communication nodes which are newly added into competition emit light or do not emit light, the space channel state of the existing ultraviolet light communication network is not changed.
The contention access comprises: when the ultraviolet communication nodes competing the channel send the signal bit of the priority information in sequence, the ultraviolet communication node with high priority sends the signal bit with the priority information of 0, and no matter the other ultraviolet communication nodes needing to be accessed and serving as competing terminals send the signal bit with the priority information of 0 or the signal bit with the priority information of 1, the competition of the ultraviolet communication nodes with high priority cannot be influenced, and when one ultraviolet communication node sends the signal bit with the priority information of 1, the ultraviolet communication node quits the competition; eventually, the high priority uv communication nodes will win the contention to access the channel.
The ultraviolet light source for ultraviolet light communication adopts an OOK modulation mode or an intensity modulation mode, namely, the signal bit is 0 when the ultraviolet light source for ultraviolet light communication emits light, and the signal bit is 1 when the ultraviolet light source for ultraviolet light communication does not emit light.
The two states of light emission and non-light emission of the ultraviolet light source used for ultraviolet light communication are respectively defined as the dominant state and the recessive state of the node where the ultraviolet light source is located.
The higher the priority, the smaller the value thereof, and the order of transmitting the priority information is from the higher bit to the lower bit.
The frame structure for communication between the ultraviolet light communication nodes comprises: a frame header comprising portions of a frame node ID's arbitration segment, control segment, data segment, and frame trailer, wherein:
the frame head and the frame tail are not used for respectively representing the start and the end of frame data, and CRC bytes are added to the frame tail part to realize data error detection;
the control section part is used for negotiation and state control between ultraviolet light communication nodes of both communication parties and corresponding management bytes aiming at an ultraviolet light communication network;
the data segment part is communication data interacted between ultraviolet light communication nodes of both communication parties;
the arbitration section including a frameid as the priority information is used to solve a contention access problem of a plurality of nodes.
The access system for the ultraviolet light communication network comprises a superposition module and a competition module which operate on the ultraviolet light communication nodes;
the superposition module is used for forming the state of the whole ultraviolet light communication network;
the contention module is configured to perform the contention entry into the channel.
All ultraviolet communication nodes of the ultraviolet communication network need to compete for channel resources before data communication;
all ultraviolet communication nodes are in a channel monitoring state before data transmission, namely, before successful competition;
the current non-communication node, namely the ultraviolet light communication node which fails to compete, continuously monitors the current communication node, namely the whole data transmission process of the ultraviolet light communication node which succeeds in competing;
when the current communication node, namely the ultraviolet communication node which successfully competes finishes the data communication process, the current communication node immediately enters a channel monitoring state again;
all ultraviolet communication nodes in the ultraviolet communication network have unique ID identifications, the ID identifications can be used as priorities, and the smaller the numerical value is, the higher the priority is;
and reasonably selecting the receiving detectors to ensure that the total luminous power of the luminous or non-luminous ultraviolet light sources of the n independent ultraviolet light communication nodes is within the light receiving dynamic range of the detector of each ultraviolet communication terminal, wherein n is a positive integer.
The invention has the beneficial effects that:
(1) compared with a time division multiplexing scheme of fixedly allocating time slots, the conflict avoidance scheme based on the competition channel is more suitable for the characteristics of limited bandwidth resources and flexible and variable node access number of the ultraviolet communication network;
(2) under the mechanism provided by the invention, when a plurality of nodes compete for accessing the channel at the same time, although competition exists, special complex conflict avoidance and backoff algorithm are not needed, thereby greatly improving the channel utilization rate, simplifying the protocol design and realizing the complexity.
Drawings
Fig. 1 is a schematic diagram of a state of an ultraviolet light communication network when an ultraviolet light communication node emits light or does not emit light.
Fig. 2 is a schematic diagram of a communication frame structure of the ultraviolet light communication network.
Fig. 3 is a diagram of a collision-free contention access procedure of an ultraviolet light communication network.
Fig. 4 is a communication process state diagram of an ultraviolet light communication network node.
Detailed Description
For networking application of an ultraviolet light communication terminal, a novel access protocol mechanism meeting the requirements needs to be designed. The invention provides a novel conflict-free competition access method, which can effectively solve the problems of channel competition, access conflict and the like in ultraviolet networking application and becomes one of key technologies for constructing an ultraviolet communication network. That is to say, the novel conflict-free contention access method of the present invention proposes a contention access protocol mechanism similar to an optical bus, and is used in networking applications of the ultraviolet light communication terminal, so that the method can make the ultraviolet light communication terminal have the advantages of network node random access, multi-node contention access conflict avoidance, etc., thereby providing a new effective mechanism and a feasible method for autonomous flexible networking of the ultraviolet light communication terminal, and further promoting practical applications of ultraviolet light communication, networking, etc.
The invention will be further described with reference to the following figures and examples.
As shown in fig. 1-4, the method for accessing system of uv communication network includes the following steps:
the method is similar to a design of an optical bus with priority, and can conveniently solve the problems of competition and conflict when multiple nodes are accessed in the networking application of ultraviolet light communication nodes serving as ultraviolet light communication terminals through the optical superposition logic. The method comprises the following steps:
supposing that an ultraviolet light source for ultraviolet light communication adopts an OOK modulation mode or an intensity modulation mode, namely that the signal bit is 0 when the ultraviolet light source for ultraviolet light communication emits light, and the signal bit is 1 when the ultraviolet light source for ultraviolet light communication does not emit light; of course, the two signals of the signal bit being 0 or the signal bit being 1 may be represented based on the intensity or degree of light emitted by the ultraviolet light source for ultraviolet light communication, respectively.
For simplicity, the present invention defines the two states of emitting and not emitting light of the uv light source for uv light communication as the dominant and recessive states of the node where the uv light source is located, respectively.
In the space of a local area network for ultraviolet communication, when any ultraviolet communication node serving as an ultraviolet communication terminal needs to transmit information, a light emitting module of the ultraviolet communication node independently emits light or does not emit light;
in combination with the dominant state or the invisible state respectively represented by the light emission or the non-light emission of the ultraviolet communication node as the ultraviolet communication terminal shown in fig. 1, the state of the whole ultraviolet communication network is formed by the principle of light superposition, and the competition access channel is performed on the basis. The node includes an ultraviolet light communication transmitting end having a light emitting module, which can be an ultraviolet light source for ultraviolet light communication. The node may also include an ultraviolet light communication receiving end having a detector.
As also shown in fig. 1, the principle of superposition of light includes: in n ultraviolet light communication nodes, as long as one ultraviolet light communication node emits light, all nodes in the communication range of the ultraviolet light communication node can detect and judge that the space channel state of the ultraviolet light communication network is an optical signal, and the state is called a dominant state; similarly, in n ultraviolet light communication nodes, only when all the ultraviolet light communication nodes do not emit light, all the ultraviolet light communication nodes in the communication range can detect and judge that the channel state is no signal light, and the channel state is a hidden state; when the space channel state of the existing ultraviolet light communication network is light, no matter the ultraviolet light communication nodes which are newly added into competition emit light or do not emit light, the space channel state of the existing ultraviolet light communication network is not changed.
The contention access comprises: when the priority of the signal bit is set to be the signal bit of the priority information which is sent by the ultraviolet communication node competing the channel in advance, the ultraviolet communication node with the high priority sends the signal bit with the value of 0 of the priority information, namely, the light emitting module of the ultraviolet communication node emits light, other ultraviolet communication nodes which need to be accessed and are used as competing terminals and have the priority of the low priority, no matter the signal bit with the value of 0 or the signal bit with the value of 1 of the priority information is sent, namely, the signal bit with the value of 0 or the signal bit with the value of 1 respectively shows that the light emitting module of the ultraviolet communication node emits light or does not emit light, the competition of the ultraviolet communication node with the high priority cannot be influenced, when one ultraviolet communication node sends the signal bit with the value of 1 of only the priority information, the ultraviolet communication node exits the contention; at this time, although competition exists among the accesses of the ultraviolet light communication nodes, conflict is not caused; eventually, the high priority uv communication nodes will win the contention to access the channel.
The higher the priority, the smaller the value thereof, and the order of transmitting the priority information is from the higher bit to the lower bit. This ensures that eventually the high priority uv communication nodes will win the contention to access the channel.
The frame structure for communication between the ultraviolet light communication nodes comprises: a frame header comprising portions of a frame node ID's arbitration segment, control segment, data segment, and frame trailer, wherein:
the frame head and the frame tail do not need special design and are respectively used for representing the start and the end of frame data, and CRC bytes are added to the frame tail part to realize data error detection;
the control section part is mainly used for negotiation and state control between ultraviolet light communication nodes of both communication parties and corresponding management bytes aiming at an ultraviolet light communication network;
the data segment part is mainly communication data interacted between ultraviolet light communication nodes of two communication parties;
the arbitration section including the framing node ID is a key part of the frame structure design of the present invention, and is used to solve the contention access problem of multiple nodes, and the framing node ID is used as the priority information.
The access system for the ultraviolet light communication network comprises a superposition module and a competition module which operate on the ultraviolet light communication nodes;
the superposition module is used for forming the state of the whole ultraviolet light communication network;
the contention module is configured to perform the contention entry into the channel.
All ultraviolet communication nodes of the ultraviolet communication network need to compete for channel resources before data communication;
all ultraviolet communication nodes are in a channel monitoring state before data transmission, namely, before successful competition;
the current non-communication node, namely the ultraviolet light communication node which fails to compete, continuously monitors the current communication node, namely the whole data transmission process of the ultraviolet light communication node which succeeds in competing;
when the current communication node, namely the ultraviolet communication node which successfully competes finishes the data communication process, the current communication node immediately enters a channel monitoring state again;
all ultraviolet communication nodes in the ultraviolet communication network have unique ID identifications, the ID identifications can be used as priorities, and the smaller the numerical value is, the higher the priority is;
and reasonably selecting the receiving detectors to ensure that the total luminous power of the luminous or non-luminous ultraviolet light sources of the n independent ultraviolet light communication nodes is within the light receiving dynamic range of the detector of each ultraviolet communication terminal, wherein n is a positive integer.
According to the optical superposition principle and the contention access basic mechanism, a typical communication process after applying the contention-free access method is described by taking an ultraviolet light communication network with four ultraviolet light communication nodes as an example. As shown in fig. 4, it is assumed that the ultraviolet light communication node a needs to contend for an access channel to implement communication with another ultraviolet light communication node D, where the specific communication process is as follows:
step 1, all ultraviolet light communication nodes A, B, C and D in an ultraviolet light communication network are initially in a channel monitoring state of the ultraviolet light communication network;
step 2, when monitoring that the channel of the ultraviolet communication network is idle, all ultraviolet communication nodes needing to access the channel for data transmission directly start a frame data sending process with a format shown in fig. 2;
and 3, if a plurality of ultraviolet light communication nodes simultaneously detect that the channel is idle and start a frame data sending process, the channel access of the ultraviolet light communication network has competition. At this time, according to the access contention mechanism described in fig. 3, the high-priority uv communication node will eventually win the contention. In this example, all the uv communication nodes detect that the channel is free, and since the priority of the uv communication node a is higher than that of the other uv communication nodes, the uv communication node a wins the contention access of the three nodes. Here, the higher the priority, the smaller the value thereof, and the order of transmitting the priority information is from the higher bit to the lower bit. And the frame node ID of the arbitration section is the priority information, the highest order to the sixth order in the binary code of the frame node ID of the ultraviolet light communication node a, the highest order to the sixth order in the binary code of the frame node ID of the ultraviolet light communication node B, and the highest order to the sixth order in the binary code of the frame node ID of the ultraviolet light communication node C are the same, and the fifth order to the third order in the binary code of the frame node ID of the ultraviolet light communication node a is "010", the fifth order to the third order in the binary code of the frame node ID of the ultraviolet light communication node B is "110", and the fifth order to the third order in the binary code of the frame node ID of the ultraviolet light communication node C is "011", and the value of the fifth order in the binary code of the frame node ID of the ultraviolet light communication node B is 1, indicating a no-light state, if the value of the fifth bit in the binary codes of the frame node IDs of the ultraviolet light communication node A and the ultraviolet light communication node C is 0, indicating that the binary codes are in a light-emitting state, the ultraviolet light communication node B is allowed to quit channel competition; and analogizing in sequence until the value of the third bit in the binary code of the frame node ID of the ultraviolet communication node C is 1, which indicates a non-luminous state, and the value of the third bit in the binary code of the frame node ID of the ultraviolet communication node A is 0, which indicates a luminous state, and the ultraviolet communication node C exits from channel competition. Eventually, the ultraviolet communication node a wins the contention access of the three nodes. In the competition, all nodes do not need to specially avoid conflict and backoff, namely, although the competition exists, the conflict is not caused, so that the competition access process of the nodes is greatly simplified.
Step 4, the ultraviolet communication node A which competes for success starts to transmit the subsequent control frame or data frame, and the ultraviolet communication node D is always in the monitoring receiving state until the transmission is finished;
and step 5, the ultraviolet light communication node B and the ultraviolet light communication node C which have failed the competition stop the current competition data transmission and are in the listen-only mode, namely, the mode is continuously in the channel monitoring state in the process that the communication nodes which have succeeded in the competition transmit data so as to wait for the high-priority node to finish the communication. If the current communication is monitored to be completed, the step 2 is entered again, and a new round of competition is started;
and 6, once the current communication node, namely the successful-competition ultraviolet communication node with the high priority completes the data transmission process, immediately reentering the channel monitoring state, namely returning to the step 1.
By the method, when a plurality of ultraviolet light communication nodes compete for channel resources, a universal back-off algorithm is not needed, and a novel method of competition without conflict is introduced based on an optical superposition mechanism. When the existing channel state is light, the newly added competitive ultraviolet communication node does not change the existing channel state no matter whether the node emits light or does not emit light; the ID identifications of the ultraviolet communication nodes with different priorities can be given according to the bit-by-bit comparison and the optical contention access operation, so that the contention 'election' process of the multiple ultraviolet communication nodes is conveniently realized, and as a result, the ultraviolet communication nodes with high priorities win out in contention. The most difference from the conventional general contention access mechanism is that in the contention access arbitration process of the multi-ultraviolet communication node of the method, each ultraviolet communication node can directly send data without considering the problems of conflict and backoff. Therefore, by the novel conflict-free competition access method, the problems of complex conflict and backoff in the competition process of the multi-ultraviolet communication node can be avoided, and the channel utilization efficiency and the system performance can be greatly improved; meanwhile, the method has simple principle and flexible design, and the design and implementation complexity is greatly reduced.
The present invention has been described in an illustrative manner by the embodiments, and it should be understood by those skilled in the art that the present disclosure is not limited to the embodiments described above, but is capable of various changes, modifications and substitutions without departing from the scope of the present invention.
Claims (6)
1. A method for an access system of an ultraviolet light communication network, comprising:
in the space of a local area network for ultraviolet communication, when any ultraviolet communication node serving as an ultraviolet communication terminal needs to transmit information, the ultraviolet communication node is independently luminous or does not emit light;
according to the dominant state or the invisible state respectively represented by the light emitting or non-light emitting of the ultraviolet light communication node as the ultraviolet light communication terminal, the state of the whole ultraviolet light communication network is formed by the light superposition principle, and the competition access channel is carried out on the basis;
the principle of superposition of light includes: in n ultraviolet light communication nodes, as long as one ultraviolet light communication node emits light, all nodes in the communication range of the ultraviolet light communication node can detect and judge that the space channel state of the ultraviolet light communication network is an optical signal, and the state is called a dominant state; similarly, in n ultraviolet light communication nodes, only when all the ultraviolet light communication nodes do not emit light, all the ultraviolet light communication nodes in the communication range can detect and judge that the channel state is no signal light, and the channel state is a hidden state; when the space channel state of the existing ultraviolet communication network is light, no matter the ultraviolet communication node which is newly added in competition is luminous or not luminous, the space channel state of the existing ultraviolet communication network is not changed;
the contention access comprises: when the ultraviolet communication nodes competing the channel send the signal bit of the priority information in sequence, the ultraviolet communication node with high priority sends the signal bit with the priority information of 0, and no matter the other ultraviolet communication nodes needing to be accessed and serving as competing terminals send the signal bit with the priority information of 0 or the signal bit with the priority information of 1, the competition of the ultraviolet communication nodes with high priority cannot be influenced, and when one ultraviolet communication node sends the signal bit with the priority information of 1, the ultraviolet communication node quits the competition; eventually, the high priority uv communication nodes will win the contention to access the channel.
2. The method according to claim 1, wherein the ultraviolet light source for ultraviolet light communication uses an OOK modulation scheme or an intensity modulation scheme, that is, the signal bit is 0 when the ultraviolet light source for ultraviolet light communication emits light, and the signal bit is 1 when the ultraviolet light source for ultraviolet light communication does not emit light.
3. The method for the access system of the uv communication network according to claim 1, wherein the two states of lighting and non-lighting of the uv light source for uv communication are defined as a dominant state and a recessive state of the node where the uv light source is located, respectively.
4. The method of claim 1, wherein the priority information is transmitted from higher bit to lower bit in order of higher priority and smaller value.
5. The method for the access system of the UV communication network according to claim 4, wherein the frame structure for communication between the UV communication nodes comprises: a frame header comprising portions of a frame node ID's arbitration segment, control segment, data segment, and frame trailer, wherein:
the frame head and the frame tail are not used for respectively representing the start and the end of frame data, and CRC bytes are added to the frame tail part to realize data error detection;
the control section part is used for negotiation and state control between ultraviolet light communication nodes of both communication parties and corresponding management bytes aiming at an ultraviolet light communication network;
the data segment part is communication data interacted between ultraviolet light communication nodes of both communication parties;
the arbitration section including a frameid as the priority information is used to solve a contention access problem of a plurality of nodes.
6. An access system for an ultraviolet light communication network is characterized by comprising a superposition module and a competition module which operate on an ultraviolet light communication node;
the superposition module is used for forming the state of the whole ultraviolet light communication network;
the competition module is used for carrying out competition to enter a channel;
all ultraviolet communication nodes of an ultraviolet communication network need to compete for channel resources before data communication;
all ultraviolet communication nodes are in a channel monitoring state before data transmission, namely, before successful competition;
the current non-communication node, namely the ultraviolet light communication node which fails to compete, continuously monitors the current communication node, namely the whole data transmission process of the ultraviolet light communication node which succeeds in competing;
when the current communication node, namely the ultraviolet communication node which successfully competes finishes the data communication process, the current communication node immediately enters a channel monitoring state again;
all ultraviolet communication nodes in the ultraviolet communication network have unique ID identifications, the ID identifications can be used as priorities, and the smaller the numerical value is, the higher the priority is;
and reasonably selecting the receiving detectors to ensure that the total luminous power of the luminous or non-luminous ultraviolet light sources of the n independent ultraviolet light communication nodes is within the light receiving dynamic range of the detector of each ultraviolet communication terminal, wherein n is a positive integer.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102324973A (en) * | 2011-05-25 | 2012-01-18 | 西安理工大学 | Ultraviolet light non-line of sight (NLOS) communication directional access method based on angular sensing |
| CN103281750A (en) * | 2013-05-31 | 2013-09-04 | 北京航空航天大学 | Cooperation multiple access method and system for guaranteeing service quality and fairness |
| CN106888051A (en) * | 2017-02-16 | 2017-06-23 | 西安电子科技大学 | Indoor visible light communication system dynamic, multi-user accesses superframe structure and cut-in method |
| CN108923855A (en) * | 2018-07-06 | 2018-11-30 | 西安电子科技大学 | Heterogeneous network uplink contention access method based on optic communication VLC |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102324973A (en) * | 2011-05-25 | 2012-01-18 | 西安理工大学 | Ultraviolet light non-line of sight (NLOS) communication directional access method based on angular sensing |
| CN103281750A (en) * | 2013-05-31 | 2013-09-04 | 北京航空航天大学 | Cooperation multiple access method and system for guaranteeing service quality and fairness |
| CN106888051A (en) * | 2017-02-16 | 2017-06-23 | 西安电子科技大学 | Indoor visible light communication system dynamic, multi-user accesses superframe structure and cut-in method |
| CN108923855A (en) * | 2018-07-06 | 2018-11-30 | 西安电子科技大学 | Heterogeneous network uplink contention access method based on optic communication VLC |
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