CN110035470B - Node equipment for realizing directional data access in multi-node wireless transmission system - Google Patents
Node equipment for realizing directional data access in multi-node wireless transmission system Download PDFInfo
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- CN110035470B CN110035470B CN201910228046.1A CN201910228046A CN110035470B CN 110035470 B CN110035470 B CN 110035470B CN 201910228046 A CN201910228046 A CN 201910228046A CN 110035470 B CN110035470 B CN 110035470B
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Abstract
The invention relates to the technical field of radio frequency identification of the Internet of things, and discloses node equipment for realizing directional data access in a multi-node wireless transmission system. After receiving the data access request message and/or the data access response message in a wireless manner, the method can acquire the preset message transmission link and/or the next forwarding target from the message, so that the message forwarding process has directivity and can reach the destination directly, thereby greatly reducing wireless transmission messages appearing at an air interface, greatly reducing the message collision rate and the packet loss rate, and achieving the purposes of quick access and channel resource saving. In addition, the node equipment also has the advantages of capability of confirming the forwarding information, capability of switching the transmission link in the midway, capability of conforming the transmission protocol stack and the like, and is convenient for practical application and popularization.
Description
Technical Field
The invention belongs to the technical field of radio frequency identification of the Internet of things, and particularly relates to node equipment for realizing directional data access in a multi-node wireless transmission system.
Background
Radio Frequency identification (rfid) technology, also called radio Frequency identification (rfid), is a communication technology, commonly called electronic tag, that can identify a specific target and read and write related data through radio signals. Currently, the RFID technology has been widely used in various fields, for example, goods sales, transportation, production, waste management, postal tracking, air baggage management, vehicle toll management, etc., and the conventional tape bar code has been slowly replaced by the RFID system in the identification field due to its small storage capacity, non-rewritable property, etc.
The integrated RFID system of the Internet of things is a multi-node wireless transmission system formed by hardware devices such as a PC device, a centralized manager, a repeater, a tag base station and an active tag, wherein the active tag is used for achieving the purposes of sensing data acquisition and the like, the tag base station is used for communicating with the active tag and interacting or collecting sensing data on one hand, and is used for directly transmitting the sensing data or transmitting the sensing data to the PC device through the repeater and the centralized manager in a transfer mode on the other hand. Because these devices all perform wireless transmission on the same or similar channels, if a PC device wants to access the sensing data on an active tag, a tag base station, or a centralized manager, it can perform data access request and response through multiple different transmission links. However, for the current centralized manager, the repeater and/or the label base station as the intermediate node device, it is unknown who receives the data access request and the response by using the transmission link until the destination is reached, so that a large amount of wireless transmission messages appear at the air interface, which not only causes the message collision rate and the packet loss rate to be high, delays the transmission time, but also causes a large amount of waste of channel resources.
Disclosure of Invention
The invention aims to solve the problems that the message collision rate and the packet loss rate are high, the transmission time is easy to delay, channel resources are wasted and the like in the data access process of the conventional multi-node wireless transmission system, and the invention aims to provide node equipment for realizing directional data access in the multi-node wireless transmission system.
The technical scheme adopted by the invention is as follows:
a node device for realizing directional data access in a multi-node wireless transmission system comprises a first acquisition unit, a first judgment unit, a second judgment unit, a first execution unit and a second execution unit;
the first obtaining unit is configured to obtain a downlink sending address, a downlink receiving address, and downlink transmission link indication information in a data access request message after the data access request message is wirelessly received, where the downlink transmission link indication information includes a total number of links with a value of M, a current number of links with a value of N, and M-N device addresses sequentially set according to a sequence from near to far, where M is a non-negative integer, and N is a non-negative integer not greater than M;
the first judging unit is in communication connection with the first obtaining unit, and is configured to judge whether the downlink receiving address matches a local device address, and if not, delete the data access request message, otherwise, start the second judging unit;
the second judging unit is communicatively connected to the first judging unit, and is configured to judge whether a difference between a total number of links in the downlink transmission link indication information and a current number of links is 0, if so, start the first executing unit, and otherwise, start the second executing unit;
the first execution unit, communicatively connected to the second determination unit, is configured to determine that a local device is an access target device, generate a data access response message corresponding to the data access request message, and send the data access response message in a feedback manner to a node device that sends the data access request message according to the downlink sending address;
the second executing unit, communicatively connected to the second determining unit, is configured to determine that the local device is an intermediate node device, wirelessly forward the data access request message to a next node device according to the first device address in the downlink transmission link indication information, and update the downlink transmission link indication information in the forwarded data access request message according to the following manner: setting the current link number as N +1, and eliminating the first equipment address which is sequentially set from near to far.
Preferably, the system further comprises a first forwarding confirmation unit, configured to determine that forwarding fails when a reception confirmation message for the forwarded data access request message is not received in due time, and then resend the forwarded data access request message until the forwarding number of the data access request message reaches the maximum forwarding number.
Further optimized, the system also comprises a first transmission link selection unit and a third execution unit;
the first transmission link selecting unit is configured to randomly select a downlink backup transmission link from a local device to an access target device from a local downlink transmission link table when the number of forwarding times of the data access request message reaches the maximum number of forwarding times, and then start the third executing unit, where the access target device is a node device corresponding to a last device address in the downlink transmission link indication information, and the downlink backup transmission link includes K device addresses sequentially set according to a near-to-far order;
the third executing unit, communicatively connected to the first transmission link selecting unit, is configured to wirelessly forward the data access request message to a next node device according to the first device address in the downstream spare transmission link, and update the downstream transmission link indication information in the forwarded data access request message in the following manner: setting the total number of links to be N + K, and replacing all original equipment addresses sequentially set from near to far by the downlink standby transmission link.
Preferably, the apparatus further includes a third determining unit interposed between the first obtaining unit and the first determining unit, and configured to determine whether the downlink sending address matches one of the uplink device addresses in the local relay link table, and delete the data access request message if none of the downlink sending addresses matches one of the uplink device addresses in the local relay link table, otherwise, start the first determining unit.
Preferably, the first obtaining unit is further configured to obtain downlink transmission link recording information in the data access request message, where the downlink transmission link recording information includes a total number of links with a value M, a current number of links with a value N, and N device addresses sequentially set according to a sequence from near to far;
the first execution unit is further configured to add the downlink transmission link recording information as uplink transmission link indication information to the data access response message when the data access response message is generated;
the second execution unit is further configured to update the downlink transmission link record information in the forwarded data access request message as follows: setting the current link number as N +1, and adding the downlink sending address before the first equipment address sequentially set from near to far.
Further optimized, the system also comprises a second obtaining unit, a fourth judging unit, a fifth judging unit, a fourth executing unit and a fifth executing unit;
the second obtaining unit is configured to obtain an uplink sending address, an uplink receiving address, and uplink transmission link indication information in the data access response message after the data access response message is wirelessly received, where the uplink transmission link indication information includes a total number of links with a value of X, a current number of links with a value of Y, and X-Y device addresses sequentially set according to a sequence from near to far, where X is a non-negative integer, and Y is a non-negative integer not greater than X;
the fourth judging unit is in communication connection with the second acquiring unit and is configured to judge whether the uplink receiving address matches a local device address, delete the data access response message if the uplink receiving address does not match the local device address, and otherwise start the fifth judging unit;
the fifth judging unit is communicatively connected to the fourth judging unit, and is configured to judge whether a difference between a total number of links in the uplink transmission link indication information and a current number of links is 0, if so, start the fourth executing unit, and otherwise, start the fifth executing unit;
the fourth execution unit is communicatively connected to the fifth judgment unit, and is configured to judge that the local device is an access start device, and store and/or display the data access response message;
the fifth executing unit, communicatively connected to the fifth determining unit, is configured to determine that the local device is an intermediate node device, wirelessly forward the data access response message to a next node device according to the first device address in the uplink transmission link indication message, and update the uplink transmission link indication message in the forwarded data access response message according to the following manner: setting the current link number as Y +1, and eliminating the first equipment address which is sequentially set from near to far.
In detail, the system further comprises a second forwarding confirmation unit, configured to determine that the forwarding fails when the reception confirmation message for the forwarded data access response message is not received in due time, and then resend the forwarded data access request message until the forwarding number of the data access response message reaches the maximum forwarding number.
The system is further optimized in detail and further comprises a second transmission link selection unit and a sixth execution unit;
the second transmission link selecting unit is configured to randomly select an uplink backup transmission link from a local device to an access starting device from a local downlink transmission link table when the number of forwarding times of the data access response message reaches the maximum number of forwarding times, and then start the sixth executing unit, where the access starting device is a node device corresponding to a last device address in the uplink transmission link indication information, and the uplink backup transmission link includes Z device addresses sequentially set according to a sequence from near to far;
the sixth executing unit, communicatively connected to the second transmission link selecting unit, is configured to wirelessly forward the data access response message to a next node device according to the first device address in the uplink backup transmission link, and update the downlink transmission link indication information in the forwarded data access response message in the following manner: setting the total number of links as Y + Z, and replacing all original equipment addresses sequentially set from near to far by the uplink standby transmission link.
And if the uplink transmission address is not matched with one of the downlink device addresses in the local relay link table, the data access response message is deleted, and otherwise, the fourth judging unit is started.
Specifically, the access initiating device is a PC device, the intermediate node device includes a centralized manager, a repeater and/or a tag base station, and the access target device is an active tag, a tag base station or a centralized manager.
The invention has the beneficial effects that:
(1) the invention has created and provided a node equipment that can realize the directional data access in the wireless transmission system of multinode, it is after receiving the solicited message of data access/data access response message wirelessly, can know the message transmission link preset in advance/and next transmit the goal from the message, make the message transmit the course have directionality, reach the destination directly, thus can reduce the wireless transmission message appearing in the empty port greatly, greatly reduce message collision rate and packet loss rate, realize the goal of visiting and saving channel resource fast;
(2) the node equipment also has the advantages of capability of confirming the forwarding information, capability of switching the transmission link in the midway, capability of conforming the transmission protocol stack and the like, and is convenient for practical application and popularization.
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, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flow chart illustrating a method for implementing directional data access in a multi-node wireless transmission system according to the present invention.
Fig. 2 is a schematic diagram of an information structure of downlink transmission link indication information provided in the present invention.
Fig. 3 is a schematic diagram of an information structure of recording information of a downlink transmission link provided by the present invention.
Fig. 4 is a schematic structural diagram of a node device for implementing directional data access in a multi-node wireless transmission system according to the present invention.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. Specific structural and functional details disclosed herein are merely illustrative of example embodiments of the invention. This invention may, however, be embodied in many alternate forms and should not be construed as limited to the embodiments set forth herein.
It will be understood that, although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of example embodiments of the present invention.
It should be understood that the term "and/or" herein is merely one type of association relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, B exists alone, and A and B exist at the same time, and the term "/and" is used herein to describe another association object relationship, which means that two relationships may exist, for example, A/and B, may mean: a alone, and both a and B alone, and further, the character "/" in this document generally means that the former and latter associated objects are in an "or" relationship.
It will be understood that when an element is referred to as being "connected," "connected," or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may be present. In contrast, when an element is referred to as being "directly adjacent" or "directly coupled" to another element, there are no intervening elements present. Other words used to describe the relationship between elements should be interpreted in a similar manner (e.g., "between … …" versus "directly between … …", "adjacent" versus "directly adjacent", etc.).
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments of the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises," "comprising," "includes," and/or "including," when used herein, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, numbers, steps, operations, elements, components, and/or groups thereof.
It should also be noted that, in some alternative implementations, the functions/acts noted may occur out of the order noted in the figures. For example, two figures shown in succession may, in fact, be executed substantially concurrently, or the figures may sometimes be executed in the reverse order, depending upon the functionality/acts involved.
In the following description, specific details are provided to facilitate a thorough understanding of example embodiments. However, it will be understood by those of ordinary skill in the art that the example embodiments may be practiced without these specific details. For example, systems may be shown in block diagrams in order not to obscure the examples in unnecessary detail. In other instances, well-known processes, structures and techniques may be shown without unnecessary detail in order to avoid obscuring example embodiments.
Example one
As shown in fig. 1 to 3, the method for implementing directional data access in a multi-node wireless transmission system according to this embodiment, that is, after a node device receives a data access request message wirelessly, may include, but is not limited to, the following steps.
S101, acquiring a downlink sending address, a downlink receiving address and downlink transmission link indicating information in the data access request message, wherein the downlink transmission link indicating information comprises the total number of links with the value of M, the current number of links with the value of N and M-N equipment addresses which are sequentially arranged from near to far, M is a non-negative integer, and N is a non-negative integer not greater than M.
In step S101, the data access request message is a message directly sent by an access initiating device or forwarded by an intermediate node device, where the downlink sending address is used to indicate a sender identity of the data access request message, and the downlink receiving address is used to indicate a receiver identity of the data access request message. The downlink transmission link indication information is used for indicating node equipment which is recommended in advance by access starting equipment or intermediate node equipment and sequentially forwards the data access request message from a message receiver to access target equipment, wherein the total number of links is used for marking the total number of the pre-estimated intermediate node equipment, the current number of links is used for marking the message receiver as the pre-estimated number of intermediate node equipment, the node equipment corresponding to the first equipment address in the downlink transmission link indication information is the next forwarding target, and the like, and the node equipment corresponding to the last equipment address in the downlink transmission link indication information is the access target equipment. In addition, if the multi-node wireless transmission system is a complete internet of things RFID system, the access initiating device may be, but is not limited to, a PC device, the intermediate node device may include, but is not limited to, a central manager, a repeater, and/or a tag base station, and the access target device may be, but is not limited to, an active tag, a tag base station, or a central manager.
S102, judging whether the downlink receiving address is matched with the local equipment address, if not, deleting the data access request message, otherwise, executing the step S103.
Before the step S102, the following steps are further included: and judging whether the downlink sending address is matched with one uplink equipment address in a local relay link list, if not, deleting the data access request message, otherwise, executing the step S102. The relay link table is used for presetting uplink node equipment which permits communication with local equipment so as to avoid receiving and processing messages from non-preset node equipment, for example, for a repeater, the uplink node equipment is preset as other repeaters or centralized managers, if the data access request message from the PC equipment is directly received, the message is directly deleted without subsequent processing, and the purpose of conforming a transmission protocol stack is achieved.
And S103, judging whether the difference between the total number of the links in the downlink transmission link indication information and the current number of the links is 0, if so, executing a step S104, and otherwise, executing a step S105.
And S104, judging that the local equipment is the access target equipment, generating a data access response message corresponding to the data access request message, and feeding back and sending the data access response message to the node equipment sending the data access request message according to the downlink sending address.
In step S104, since the difference between the total number of links and the current number of links is 0, there is no next forwarding target in the downlink transmission link indication information, and thus the local device is the access target device, and may generate a corresponding data access response message according to the data access request message, for example, when requesting to access the sensing data, package the sensing data in the data access response message, and perform uplink feedback.
S105, judging that the local equipment is the intermediate node equipment, wirelessly forwarding the data access request message to the next node equipment according to the first equipment address in the downlink transmission link indication information, and updating the downlink transmission link indication information in the forwarded data access request message according to the following mode: setting the current link number as N +1, and eliminating the first equipment address which is sequentially set from near to far.
In step S105, since the difference between the total number of links and the current number of links is greater than 0, there are several forwarding targets in the downlink transmission link indication information, and thus the local device is the intermediate node device and needs to continue to forward the data access request.
Therefore, through the foregoing steps S101 to S105, after receiving the data access request message wirelessly, the node device can obtain the message downlink transmission link preset in advance and/or the next forwarding target from the message, so that the message forwarding process has directivity and reaches the destination directly, thereby greatly reducing wireless transmission messages appearing at the air interface, greatly reducing the message collision rate and the packet loss rate, and achieving the purposes of fast access and saving channel resources.
Preferably, after the step S105, the method further includes the following steps: s106, if the receiving confirmation message aiming at the forwarded data access request message is not received according to the period, the forwarding failure is judged, and then the forwarded data access request message is sent again until the forwarding times of the data access request message reach the maximum forwarding times. Through the foregoing step S106, the forwarding message can also be confirmed and retransmitted, so as to prevent the data access request from being unknown, for example, the maximum forwarding number may be specifically designed to be 3 times.
S107, randomly selecting a downlink standby transmission link from local equipment to access target equipment from a local downlink transmission link table, wherein the access target equipment is node equipment corresponding to the last equipment address in the downlink transmission link indication information, and the downlink standby transmission link comprises K equipment addresses sequentially arranged from near to far; s108, wirelessly forwarding the data access request message to the next node device according to the first device address in the downlink spare transmission link, and simultaneously updating downlink transmission link indication information in the forwarded data access request message according to the following mode: setting the total number of links to be N + K, and replacing all original equipment addresses sequentially set from near to far by the downlink standby transmission link. The local downlink transmission link table is used for presetting a plurality of downlink standby transmission links from the local equipment to the access target equipment so as to switch the transmission links at any time when the current transmission links are not communicated. Therefore, through the foregoing steps S107 and S108, when it is determined that the current downlink transmission link is not available, one downlink backup transmission link can be randomly switched to forward the data access request, so as to ensure that the data access request can finally reach the destination, which is particularly suitable for a situation where transmission congestion occurs in the current downlink transmission link. Furthermore, after the step S108, the step S105 needs to be executed again to confirm whether the forwarding fails.
Optimally, in the step S101, downlink link record information in the data access request message is further obtained, where the downlink link record information includes a total number of links with a value M, a current number of links with a value N, and N device addresses sequentially set according to a sequence from near to far; in step S104, the data access response message includes the downlink transmission link recording information as uplink transmission link indication information; in said step S105, the downlink link record information in the forwarded data access request message is updated as follows: setting the current link number as N +1, and adding the downlink sending address before the first equipment address sequentially set from near to far. The downlink transmission link recording information is used for recording node equipment which completes data access request message sending in sequence from access starting equipment to a message sender, namely, the node equipment corresponding to the first equipment address in the downlink transmission link recording information is the previous sending source, and so on, and the node equipment corresponding to the last equipment address in the downlink transmission link recording information is the access starting equipment. Because the downlink transmission link recording information records the link information for realizing successful transmission of the message at present, the uplink feedback is performed on the link (that is, the downlink transmission link recording information is used as the uplink transmission link indicating information), so that "no unnecessary waiting" can be reduced in the process of forwarding the data feedback, and the data access response message can be ensured to be quickly fed back to the access starting equipment.
Further preferably, after the node device wirelessly receives the data access response message, the node device includes the following steps: s201, acquiring an uplink sending address, an uplink receiving address and uplink transmission link indication information in the data access response message, wherein the uplink transmission link indication information comprises the total number of links with a value of X, the current number of links with a value of Y and X-Y equipment addresses which are sequentially arranged from near to far, X is a non-negative integer, and Y is a non-negative integer not greater than X; s202, judging whether the uplink receiving address is matched with a local equipment address, if not, deleting the data access response message, otherwise, executing the step S203; s203, judging whether the difference between the total number of links in the uplink transmission link indication information and the current number of links is 0, if so, executing a step S204, otherwise, executing a step S205; s204, judging that the local equipment is access starting equipment, and storing and/or displaying the data access response message; s205, determining that the local device is an intermediate node device, wirelessly forwarding the data access response message to a next node device according to the first device address in the uplink transmission link indication message, and simultaneously updating the uplink transmission link indication message in the forwarded data access response message according to the following mode: setting the current link number as Y +1, and eliminating the first equipment address which is sequentially set from near to far. Before the step S202, the method further includes the following steps: and judging whether the uplink sending address is matched with one downlink equipment address in the local relay link list, if not, deleting the data access response message, otherwise, executing the step S202.
In detail, after the step S205, the following steps are further included: s206, if the receiving confirmation message aiming at the forwarded data access response message is not received according to the period, the forwarding failure is judged, and then the forwarded data access response message is sent again until the forwarding times of the data access response message reach the maximum forwarding times.
S207, randomly selecting an uplink standby transmission link from local equipment to access initial equipment from a local downlink transmission link table, wherein the access initial equipment is node equipment corresponding to the address of the last equipment in the indication information of the uplink transmission link, and the uplink standby transmission link comprises Z equipment addresses which are sequentially arranged from near to far; s208, wirelessly forwarding the data access response message to the next node device according to the first device address in the uplink spare transmission link, and simultaneously updating downlink transmission link indication information in the forwarded data access response message according to the following mode: setting the total number of links as Y + Z, and replacing all original equipment addresses sequentially set from near to far by the uplink standby transmission link.
The foregoing steps S201 to S208 describe a processing method of the node device after wirelessly receiving the data access response message, and specific details and technical effects thereof are corresponding to or similar to the processing method of steps S101 to S108, and are not described herein again.
In summary, the method for implementing directional data access in a multi-node wireless transmission system provided by the embodiment has the following technical effects:
(1) the embodiment provides a method for realizing directional data access in a multi-node wireless transmission system, that is, after receiving a data access request message and/or a data access response message wirelessly, a node device can acquire a message transmission link preset in advance and/or a next forwarding target from the message, so that the message forwarding process has directivity and reaches the destination directly, thereby greatly reducing wireless transmission messages appearing at an air interface, greatly reducing the message collision rate and the packet loss rate, and realizing the purposes of quick access and channel resource saving;
(2) the method for realizing the directional data access also has the advantages of capability of confirming the forwarding information, capability of switching the transmission link in the midway, capability of conforming the transmission protocol stack and the like, and is convenient for practical application and popularization.
Example two
As shown in fig. 4, this embodiment provides a node device for implementing the method of the first embodiment, which includes a first obtaining unit, a first determining unit, a second determining unit, a first executing unit, and a second executing unit;
the first obtaining unit is configured to obtain a downlink sending address, a downlink receiving address, and downlink transmission link indication information in a data access request message after the data access request message is wirelessly received, where the downlink transmission link indication information includes a total number of links with a value of M, a current number of links with a value of N, and M-N device addresses sequentially set according to a sequence from near to far, where M is a non-negative integer, and N is a non-negative integer not greater than M;
the first judging unit is in communication connection with the first obtaining unit, and is configured to judge whether the downlink receiving address matches a local device address, and if not, delete the data access request message, otherwise, start the second judging unit;
the second judging unit is communicatively connected to the first judging unit, and is configured to judge whether a difference between a total number of links in the downlink transmission link indication information and a current number of links is 0, if so, start the first executing unit, and otherwise, start the second executing unit;
the first execution unit, communicatively connected to the second determination unit, is configured to determine that a local device is an access target device, generate a data access response message corresponding to the data access request message, and send the data access response message in a feedback manner to a node device that sends the data access request message according to the downlink sending address;
the second executing unit, communicatively connected to the second determining unit, is configured to determine that the local device is an intermediate node device, wirelessly forward the data access request message to a next node device according to the first device address in the downlink transmission link indication information, and update the downlink transmission link indication information in the forwarded data access request message according to the following manner: setting the current link number as N +1, and eliminating the first equipment address which is sequentially set from near to far.
Preferably, the system further comprises a first forwarding confirmation unit, configured to determine that forwarding fails when a reception confirmation message for the forwarded data access request message is not received in due time, and then resend the forwarded data access request message until the forwarding number of the data access request message reaches the maximum forwarding number.
Further optimized, the system also comprises a first transmission link selection unit and a third execution unit;
the first transmission link selecting unit is configured to randomly select a downlink backup transmission link from a local device to an access target device from a local downlink transmission link table when the number of forwarding times of the data access request message reaches the maximum number of forwarding times, and then start the third executing unit, where the access target device is a node device corresponding to a last device address in the downlink transmission link indication information, and the downlink backup transmission link includes K device addresses sequentially set according to a near-to-far order;
the third executing unit, communicatively connected to the first transmission link selecting unit, is configured to wirelessly forward the data access request message to a next node device according to the first device address in the downstream spare transmission link, and update the downstream transmission link indication information in the forwarded data access request message in the following manner: setting the total number of links to be N + K, and replacing all original equipment addresses sequentially set from near to far by the downlink standby transmission link.
Preferably, the apparatus further includes a third determining unit interposed between the first obtaining unit and the first determining unit, and configured to determine whether the downlink sending address matches one of the uplink device addresses in the local relay link table, and delete the data access request message if none of the downlink sending addresses matches one of the uplink device addresses in the local relay link table, otherwise, start the first determining unit.
Preferably, the first obtaining unit is further configured to obtain downlink transmission link recording information in the data access request message, where the downlink transmission link recording information includes a total number of links with a value M, a current number of links with a value N, and N device addresses sequentially set according to a sequence from near to far;
the first execution unit is further configured to add the downlink transmission link recording information as uplink transmission link indication information to the data access response message when the data access response message is generated;
the second execution unit is further configured to update the downlink transmission link record information in the forwarded data access request message as follows: setting the current link number as N +1, and adding the downlink sending address before the first equipment address sequentially set from near to far.
Further optimized, the system also comprises a second obtaining unit, a fourth judging unit, a fifth judging unit, a fourth executing unit and a fifth executing unit;
the second obtaining unit is configured to obtain an uplink sending address, an uplink receiving address, and uplink transmission link indication information in the data access response message after the data access response message is wirelessly received, where the uplink transmission link indication information includes a total number of links with a value of X, a current number of links with a value of Y, and X-Y device addresses sequentially set according to a sequence from near to far, where X is a non-negative integer, and Y is a non-negative integer not greater than X;
the fourth judging unit is in communication connection with the second acquiring unit and is configured to judge whether the uplink receiving address matches a local device address, delete the data access response message if the uplink receiving address does not match the local device address, and otherwise start the fifth judging unit;
the fifth judging unit is communicatively connected to the fourth judging unit, and is configured to judge whether a difference between a total number of links in the uplink transmission link indication information and a current number of links is 0, if so, start the fourth executing unit, and otherwise, start the fifth executing unit;
the fourth execution unit is communicatively connected to the fifth judgment unit, and is configured to judge that the local device is an access start device, and store and/or display the data access response message;
the fifth executing unit, communicatively connected to the fifth determining unit, is configured to determine that the local device is an intermediate node device, wirelessly forward the data access response message to a next node device according to the first device address in the uplink transmission link indication message, and update the uplink transmission link indication message in the forwarded data access response message according to the following manner: setting the current link number as Y +1, and eliminating the first equipment address which is sequentially set from near to far.
In detail, the system further comprises a second forwarding confirmation unit, configured to determine that the forwarding fails when the reception confirmation message for the forwarded data access response message is not received in due time, and then resend the forwarded data access request message until the forwarding number of the data access response message reaches the maximum forwarding number.
The system is further optimized in detail and further comprises a second transmission link selection unit and a sixth execution unit;
the second transmission link selecting unit is configured to randomly select an uplink backup transmission link from a local device to an access starting device from a local downlink transmission link table when the number of forwarding times of the data access response message reaches the maximum number of forwarding times, and then start the sixth executing unit, where the access starting device is a node device corresponding to a last device address in the uplink transmission link indication information, and the uplink backup transmission link includes Z device addresses sequentially set according to a sequence from near to far;
the sixth executing unit, communicatively connected to the second transmission link selecting unit, is configured to wirelessly forward the data access response message to a next node device according to the first device address in the uplink backup transmission link, and update the downlink transmission link indication information in the forwarded data access response message in the following manner: setting the total number of links as Y + Z, and replacing all original equipment addresses sequentially set from near to far by the uplink standby transmission link.
And if the uplink transmission address is not matched with one of the downlink device addresses in the local relay link table, the data access response message is deleted, and otherwise, the fourth judging unit is started.
Specifically, the access start device is a Personal Computer (PC) device, the intermediate node device includes a centralized manager, a repeater and/or a label base station, and the access target device is an active label, a label base station or a centralized manager.
The technical details and technical effects of the present embodiment are the same as those of the first embodiment, and are not described herein again.
The present invention is not limited to the above-described alternative embodiments, and various other forms of products can be obtained by anyone in light of the present invention. The above detailed description should not be taken as limiting the scope of the invention, which is defined in the claims, and which the description is intended to be interpreted accordingly.
Claims (8)
1. A node apparatus for implementing directional data access in a multi-node wireless transmission system, characterized in that: the system comprises a first acquisition unit, a first judgment unit, a second judgment unit, a first execution unit, a second execution unit, a first forwarding confirmation unit, a first transmission link selection unit and a third execution unit;
the first obtaining unit is configured to obtain a downlink sending address, a downlink receiving address, and downlink transmission link indication information in a data access request message after the data access request message is wirelessly received, where the downlink transmission link indication information includes a total number of links with a value of M, a current number of links with a value of N, and M-N device addresses sequentially set according to a sequence from near to far, where M is a non-negative integer, and N is a non-negative integer not greater than M;
the first judging unit is in communication connection with the first obtaining unit, and is configured to judge whether the downlink receiving address matches a local device address, and if not, delete the data access request message, otherwise, start the second judging unit;
the second judging unit is communicatively connected to the first judging unit, and is configured to judge whether a difference between a total number of links in the downlink transmission link indication information and a current number of links is 0, if so, start the first executing unit, and otherwise, start the second executing unit;
the first execution unit, communicatively connected to the second determination unit, is configured to determine that a local device is an access target device, generate a data access response message corresponding to the data access request message, and send the data access response message in a feedback manner to a node device that sends the data access request message according to the downlink sending address;
the second executing unit, communicatively connected to the second determining unit, is configured to determine that the local device is an intermediate node device, wirelessly forward the data access request message to a next node device according to the first device address in the downlink transmission link indication information, and update the downlink transmission link indication information in the forwarded data access request message according to the following manner: setting the current link number as N +1, and eliminating first equipment addresses sequentially set from near to far;
the first forwarding confirmation unit is configured to determine that forwarding fails when a reception confirmation message for the forwarded data access request message is not received in due time, and then resend the forwarded data access request message until the forwarding frequency of the data access request message reaches the maximum forwarding frequency;
the first transmission link selecting unit is configured to randomly select a downlink backup transmission link from a local device to an access target device from a local downlink transmission link table when the number of forwarding times of the data access request message reaches the maximum number of forwarding times, and then start the third executing unit, where the access target device is a node device corresponding to a last device address in the downlink transmission link indication information, and the downlink backup transmission link includes K device addresses sequentially set according to a near-to-far order;
the third executing unit, communicatively connected to the first transmission link selecting unit, is configured to wirelessly forward the data access request message to a next node device according to the first device address in the downstream spare transmission link, and update the downstream transmission link indication information in the forwarded data access request message in the following manner: setting the total number of links to be N + K, and replacing all original equipment addresses sequentially set from near to far by the downlink standby transmission link.
2. The node apparatus for implementing directed data access in a multi-node wireless transmission system as claimed in claim 1, wherein: the system further comprises a third judging unit which is arranged between the first acquiring unit and the first judging unit and used for judging whether the downlink sending address is matched with one uplink equipment address in a local relay link table or not, if the downlink sending address is not matched with one uplink equipment address in the local relay link table, the data access request message is deleted, and otherwise, the first judging unit is started.
3. The node apparatus for implementing directed data access in a multi-node wireless transmission system as claimed in claim 1, wherein: the first obtaining unit is further configured to obtain downlink transmission link recording information in the data access request message, where the downlink transmission link recording information includes a total number of links with a value of M, a current number of links with a value of N, and N device addresses sequentially set according to a sequence from near to far;
the first execution unit is further configured to add the downlink transmission link recording information as uplink transmission link indication information to the data access response message when the data access response message is generated;
the second execution unit is further configured to update the downlink transmission link record information in the forwarded data access request message as follows: setting the current link number as N +1, and adding the downlink sending address before the first equipment address sequentially set from near to far.
4. A node device for enabling directional data access in a multi-node wireless transmission system according to claim 3, wherein: the device also comprises a second acquisition unit, a fourth judgment unit, a fifth judgment unit, a fourth execution unit and a fifth execution unit;
the second obtaining unit is configured to obtain an uplink sending address, an uplink receiving address, and uplink transmission link indication information in the data access response message after the data access response message is wirelessly received, where the uplink transmission link indication information includes a total number of links with a value of X, a current number of links with a value of Y, and X-Y device addresses sequentially set according to a sequence from near to far, where X is a non-negative integer, and Y is a non-negative integer not greater than X;
the fourth judging unit is in communication connection with the second acquiring unit and is configured to judge whether the uplink receiving address matches a local device address, delete the data access response message if the uplink receiving address does not match the local device address, and otherwise start the fifth judging unit;
the fifth judging unit is communicatively connected to the fourth judging unit, and is configured to judge whether a difference between a total number of links in the uplink transmission link indication information and a current number of links is 0, if so, start the fourth executing unit, and otherwise, start the fifth executing unit;
the fourth execution unit is communicatively connected to the fifth judgment unit, and is configured to judge that the local device is an access start device, and store and/or display the data access response message;
the fifth executing unit, communicatively connected to the fifth determining unit, is configured to determine that the local device is an intermediate node device, wirelessly forward the data access response message to a next node device according to the first device address in the uplink transmission link indication message, and update the uplink transmission link indication message in the forwarded data access response message according to the following manner: setting the current link number as Y +1, and eliminating the first equipment address which is sequentially set from near to far.
5. The node apparatus for implementing directed data access in a multi-node wireless transmission system as claimed in claim 4, wherein: the system also comprises a second forwarding confirmation unit, which is used for judging that the forwarding fails when the receiving confirmation message aiming at the forwarded data access response message is not received according to the period, and then resending the forwarded data access request message until the forwarding times of the data access response message reach the maximum forwarding times.
6. The node apparatus for implementing directed data access in a multi-node wireless transmission system as claimed in claim 5, wherein: the device also comprises a second transmission link selection unit and a sixth execution unit;
the second transmission link selecting unit is configured to randomly select an uplink backup transmission link from a local device to an access starting device from a local downlink transmission link table when the number of forwarding times of the data access response message reaches the maximum number of forwarding times, and then start the sixth executing unit, where the access starting device is a node device corresponding to a last device address in the uplink transmission link indication information, and the uplink backup transmission link includes Z device addresses sequentially set according to a sequence from near to far;
the sixth executing unit, communicatively connected to the second transmission link selecting unit, is configured to wirelessly forward the data access response message to a next node device according to the first device address in the uplink backup transmission link, and update the downlink transmission link indication information in the forwarded data access response message in the following manner: setting the total number of links as Y + Z, and replacing all original equipment addresses sequentially set from near to far by the uplink standby transmission link.
7. The node apparatus for implementing directed data access in a multi-node wireless transmission system as claimed in claim 4, wherein: the system further comprises a sixth judging unit which is arranged between the second acquiring unit and the fourth judging unit and used for judging whether the uplink sending address is matched with one downlink equipment address in a local relay link table or not, if the uplink sending address is not matched with one downlink equipment address in the local relay link table, the data access response message is deleted, and if the uplink sending address is not matched with one downlink equipment address in the local relay link table, the fourth judging unit is started.
8. The node apparatus for implementing directed data access in a multi-node wireless transmission system as claimed in claim 4, wherein:
the access starting device is a PC device, the intermediate node device comprises a centralized manager, a repeater and/or a label base station, and the access target device is an active label, a label base station or a centralized manager.
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