CN117792855A - Method and device for realizing frame structure of wireless ad hoc network system - Google Patents
Method and device for realizing frame structure of wireless ad hoc network system Download PDFInfo
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Abstract
The invention relates to the technical field of wireless LTE (long term evolution) ad hoc networks, in particular to a method and a device for realizing a frame structure of a wireless ad hoc network system, which adopt a TDMA (time division multiple access) multiple access scheme, wherein the TDMA is a wireless communication technology and is used for realizing time division multiple access in the wireless ad hoc network, the frame structure of the TDMA is composed of N frames, the serial numbers of each frame are respectively 0, 1 and …, and N-1 are repeated by taking the superframe as a unit; one frame is composed of M subframes, and the number of each subframe is 0, 1, … and M-1 respectively; one or more subframes in one frame are used as synchronization subframes for a node to transmit a synchronization signal to allow a neighbor node to complete time synchronization and timing maintenance, and subframe 0 is used as a synchronization subframe. Compared with the prior art, the invention can realize the support of the communication requirement of the ad hoc network in various scenes through flexible frame structure design. Through the configuration combination of a plurality of subframe structures, the optimization of the resource utilization efficiency is achieved.
Description
Technical Field
The invention relates to the technical field of wireless LTE (long term evolution) ad hoc networks, and particularly provides a method and a device for realizing a frame structure of a wireless ad hoc network system.
Background
Ad Hoc networks (Ad Hoc networks) are wireless communication networks that can be autonomously networked without infrastructure support. It features that the network nodes can dynamically establish connection without relying on traditional base station or central control. This makes ad hoc networking technology have a wide application potential in military communications, emergency rescue, internet of things (IoT), mobile sensor networks, internet of vehicles, and other fields.
Ad hoc networks typically use ad hoc protocols to enable communication and collaboration between nodes, but the performance and efficiency of the protocols depend on the design of the frame structure. The frame structure defines the format, fields and transmission mechanism of the data frame, and has important influence on the performance, delay, energy consumption and anti-interference capability of the network.
In the prior art, ad hoc network frame structures are generally subject to some of the following limitations or challenges:
spectral efficiency: the existing frame structure may not sufficiently optimize spectrum utilization, resulting in resource waste.
Network topology change: ad hoc networks often face the situation of nodes joining, leaving or moving, requiring that the frame structure be able to adapt to topology changes, maintaining reliability of communications.
Energy consumption problem: mobile devices are typically limited in battery power, so the frame structure needs to take into account how to reduce the power consumption of the node.
Disclosure of Invention
The invention provides a practical realization method of a frame structure of a wireless ad hoc network system aiming at the defects of the prior art.
The invention further aims to provide a frame structure realization device of a wireless ad hoc network system, which is reasonable in design, safe and applicable.
The technical scheme adopted for solving the technical problems is as follows:
a method for realizing frame structure of wireless self-organizing network system adopts TDMA multiple access scheme, TDMA is a wireless communication technology for realizing time division multiple access in wireless self-organizing network;
the frame structure of the TDMA is that a superframe consists of N frames, and the serial numbers of each frame are respectively 0, 1 and … and N-1 and are repeated by taking the superframe as a unit;
one frame is composed of M subframes, and the number of each subframe is 0, 1, … and M-1 respectively;
one or more subframes in one frame are used as synchronization subframes for a node to transmit a synchronization signal to allow a neighbor node to complete time synchronization and timing maintenance, wherein subframe 0 is used as a synchronization subframe.
Furthermore, each subframe in the frame structure comprises L OFDM symbols, the numbers of which are respectively 0, 1 and … and L-1, and the parallel transmission of high-speed serial data is realized through frequency division multiplexing by adopting OFDM, namely an orthogonal frequency division multiplexing technology, and the method is used in high-data rate communication.
Further, for the transmission distance of the ad hoc network, three scenes including a short distance, a medium distance and a long distance are divided, three different GPs are designed for different transmission distances, namely, protection intervals, so that optimal resource efficiency utilization is obtained:
(1) GP=1, is suitable for short-distance ad hoc networks, and supports a maximum transmission distance of 5-10 km;
(2) Gp=2, suitable for medium-distance ad hoc networks, supporting a maximum transmission distance of 20 km;
(3) Gp=6, suitable for long-range ad hoc networks, supporting a maximum transmission distance of 100 km.
Further, according to the resource scheduling type, different subframes are of different subframe types:
(1) Adopting continuous subframe allocation, GP is not needed for other subframes except the last subframe;
(2) The last subframe of the consecutive subframes requires GP.
Further, the topology of the ad hoc network includes:
(1) Star topology: in a star topology, all devices are connected to one central node or base station, the central node acting as a relay point for data transmission;
(2) Tree topology: a tree topology is a hierarchical structure in which devices are connected to a root node through intermediate nodes;
(3) Ring topology: in a ring topology, each device is connected to two adjacent devices to form a ring;
(4) Mesh topology: is suitable for large-scale ad hoc networks.
Furthermore, for star topology, tree topology and ring topology, there is a topology structure with explicit node layering, and if uplink transmission synchronization can be obtained between the nodes of the relative transmission, GP is not needed.
Further, for mesh topology, it is difficult to obtain uplink transmission synchronization;
for all topologies, a subframe type without AGC automatic gain control is employed if stable link quality monitoring can be obtained.
A wireless ad hoc network system frame structure implementing apparatus, comprising: at least one memory and at least one processor;
the at least one memory for storing a machine readable program;
the at least one processor is configured to invoke the machine-readable program to perform a method for implementing a frame structure of a wireless ad hoc network system.
Compared with the prior art, the method and the device for realizing the frame structure of the wireless ad hoc network system have the following outstanding beneficial effects:
the invention adopts a TDMA multiple access scheme, and realizes the support of the communication requirement of the ad hoc network in various scenes through flexible frame structure design. Through the configuration combination of a plurality of subframe structures, the optimization of the resource utilization efficiency is achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an ad hoc network frame structure in a method for implementing a wireless ad hoc network system frame structure;
fig. 2 is a schematic diagram of an ad hoc network sub-frame structure in a method for implementing a frame structure of a wireless ad hoc network system;
fig. 3 is a schematic diagram of an ad hoc network subframe type in a method for implementing a frame structure of a wireless ad hoc network system.
Detailed Description
In order to provide a better understanding of the aspects of the present invention, the present invention will be described in further detail with reference to specific embodiments. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
A preferred embodiment is given below:
in this embodiment, a TDMA (Time Division Multiple Access) multiple access scheme is adopted, and TDMA is a wireless communication technology, which is used to implement time division multiple access in a wireless ad hoc network. Compared with other multiple access schemes, the TDMA ad hoc network has the advantages of high time efficiency, good synchronization performance and strong anti-interference performance.
As shown in fig. 1, the frame structure of the TDMA is a super frame consisting of N frames, each numbered 0, 1, …, N-1, and repeated in units of super frames;
one frame is composed of M subframes, and the number of each subframe is 0, 1, … and M-1 respectively;
one or more subframes in one frame are used as synchronization subframes for a node to transmit a synchronization signal to allow a neighbor node to complete time synchronization and timing maintenance, wherein subframe 0 is used as a synchronization subframe.
As shown in fig. 2, each subframe in the frame structure includes L OFDM symbols, with numbers of 0, 1, …, and L-1, and OFDM, that is, an orthogonal frequency division multiplexing technology, is adopted, and parallel transmission of high-speed serial data is implemented through frequency division multiplexing, which is used in high-data rate communication.
In the ad hoc network system, the requirements for the physical layer frame structure are different due to different transmission distances, ad hoc network topological structures and other application scenes. In the traditional ad hoc network system, the frame structure is single, and unified support for various scenes cannot be ensured. The invention can effectively solve the problems of the traditional ad hoc network system by designing a flexible ad hoc network frame structure.
In order to support various application scenarios of the ad hoc network, as shown in fig. 3, the ad hoc network subframe type designed for the present invention is shown. Different subframe types can be flexibly configured according to different transmission distances and topological structures. The following describes the corresponding subframe types in detail with respect to the transmission distance and the topology.
The transmission distance of the ad hoc network can be divided into three scenes of short distance, medium distance and long distance. In the subframe structure, three different GPs (guard intervals) are designed for different transmission distances, and the GP length is flexibly configured according to specific application scenes, so that the optimal resource efficiency utilization can be obtained:
(1) GP=1, is suitable for short-distance ad hoc networks, and supports a maximum transmission distance of 5-10 km;
(2) Gp=2, suitable for medium-distance ad hoc networks, supporting a maximum transmission distance of 20 km;
(3) Gp=6, suitable for long-range ad hoc networks, supporting a maximum transmission distance of 100 km.
Different subframes may also be of different subframe types, depending on the type of resource scheduling:
(1) If consecutive subframe allocation is used, no GP is needed for other subframes than the last subframe, so subframe types 7 and 8 may be used.
(2) The last subframe of consecutive subframes requires GP and thus subframe types 1-6 may be employed.
The topology of the ad hoc network includes:
(1) Star Topology (Star Topology): in a star topology, all devices are connected to one central node or base station, the central node acting as a relay point for data transmission; star topology is commonly used for smaller ad hoc networks, such as home networks.
(2) Tree Topology (Tree Topology): a tree topology is a hierarchical structure in which devices are connected to a root node through intermediate nodes; this topology helps to extend the network and is commonly used in some military and emergency communication scenarios.
(3) Ring Topology (Ring Topology): in a ring topology, each device is connected to two adjacent devices to form a ring; data is transferred in loops, and this topology is suitable for scenarios where a specific data flow direction is required.
(4) Mesh Topology (Mesh Topology): in a mesh topology, each device may communicate directly with other devices without having to go through a central node. This topology is suitable for large ad hoc networks because it provides a high degree of redundancy and scalability.
According to different specific topological structures of the ad hoc network system, corresponding subframe types are selected, so that communication requirements under the corresponding topological structures can be met, and resource efficiency can be fully utilized. Specifically:
(1) For star topology, tree topology, ring topology and the like, which have a specific node layered topology structure, if uplink transmission synchronization can be obtained between the nodes which are transmitted relatively, GP is not needed, and all subframes can adopt subframe type 7 and type 8.
(2) For mesh topology, since the transmission relationship between nodes is complex, it is difficult to obtain uplink transmission synchronization, and thus subframe types 1-6 can be used.
(3) For all topologies, subframe types without AGC (automatic gain control), i.e. subframe types 2, 4, 6, 8, can be used if stable link quality monitoring is available.
The following table is a specific description of parameters of different subframe types and applicable scenarios:
based on the above method, a device for implementing a frame structure of a wireless ad hoc network system in this embodiment includes: at least one memory and at least one processor;
the at least one memory for storing a machine readable program;
the at least one processor is configured to invoke the machine-readable program to perform a method for implementing a frame structure of a wireless ad hoc network system.
The above-mentioned specific embodiments are merely specific examples of the present invention, and the scope of the present invention is not limited to the specific embodiments, and any suitable changes or substitutions made by those skilled in the art, which conform to the technical solutions described in the claims of the present invention, should fall within the scope of the present invention.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A method for realizing a frame structure of a wireless self-organizing network system is characterized in that a TDMA multiple access scheme is adopted, wherein TDMA is a wireless communication technology and is used for realizing time division multiple access in the wireless self-organizing network;
the frame structure of the TDMA is that a superframe consists of N frames, and the serial numbers of each frame are respectively 0, 1 and … and N-1 and are repeated by taking the superframe as a unit;
one frame is composed of M subframes, and the number of each subframe is 0, 1, … and M-1 respectively;
one or more subframes in one frame are used as synchronization subframes for a node to transmit a synchronization signal to allow a neighbor node to complete time synchronization and timing maintenance, wherein subframe 0 is used as a synchronization subframe.
2. The method for implementing the frame structure of the wireless ad hoc network system according to claim 1, wherein each subframe in the frame structure includes L OFDM symbols, the numbers of which are respectively 0, 1, …, and L-1, and the method is characterized in that the OFDM, that is, orthogonal frequency division multiplexing technology is adopted to implement parallel transmission of high-speed serial data through frequency division multiplexing, and is used in high data rate communication.
3. The method for realizing the frame structure of the wireless ad hoc network system according to claim 2, wherein the transmission distance of the ad hoc network is divided into three scenes of short distance, medium distance and long distance, and three different GPs are designed for different transmission distances, namely protection intervals, so as to obtain the optimal resource efficiency utilization:
(1) GP=1, is suitable for short-distance ad hoc networks, and supports a maximum transmission distance of 5-10 km;
(2) Gp=2, suitable for medium-distance ad hoc networks, supporting a maximum transmission distance of 20 km;
(3) Gp=6, suitable for long-range ad hoc networks, supporting a maximum transmission distance of 100 km.
4. The method for implementing a frame structure of a wireless ad hoc network system according to claim 3, wherein different subframes are of different subframe types according to the resource scheduling type:
(1) Adopting continuous subframe allocation, GP is not needed for other subframes except the last subframe;
(2) The last subframe of the consecutive subframes requires GP.
5. The method for implementing a frame structure of a wireless ad hoc network system according to claim 4, wherein the topology of the ad hoc network comprises:
(1) Star topology: in a star topology, all devices are connected to one central node or base station, the central node acting as a relay point for data transmission;
(2) Tree topology: a tree topology is a hierarchical structure in which devices are connected to a root node through intermediate nodes;
(3) Ring topology: in a ring topology, each device is connected to two adjacent devices to form a ring;
(4) Mesh topology: is suitable for large-scale ad hoc networks.
6. The method according to claim 5, wherein there is a topology structure of explicit node layering for star topology, tree topology and ring topology, and if uplink transmission synchronization can be obtained between nodes of the relative transmission, GP is not required.
7. The method for implementing a frame structure of a wireless ad hoc network system according to claim 6, wherein it is difficult to obtain uplink transmission synchronization for a mesh topology;
for all topologies, a subframe type without AGC automatic gain control is employed if stable link quality monitoring can be obtained.
8. A wireless ad hoc network system frame structure implementation device, comprising: at least one memory and at least one processor;
the at least one memory for storing a machine readable program;
the at least one processor being configured to invoke the machine readable program to perform the method of any of claims 1 to 7.
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| CN109889464A (en) * | 2015-12-31 | 2019-06-14 | 华为技术有限公司 | Transmit the method and user equipment of data |
| CN114205426A (en) * | 2021-12-08 | 2022-03-18 | 西安讯智通达科技有限公司 | Frame structure, node and node communication method of wireless ad hoc network |
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