CN105208565A - Physical layer framework for micro-power wireless area coverage electric power communication private network - Google Patents

Abstract

The present invention relates to a physical layer framework for a micro-power wireless area coverage power communication private network, adopting a suitable micro-power wireless communication platform as the communication physical layer, including adopting an effective data encoding and decoding model, and suitable channel multiplexing technology And the channel selection technology based on frequency hopping technology, in which the channel multiplexing method adopts TDMA+FDMA two data and signal multiplexing models within the selected wireless communication frequency band, using multiple sub-frequency bands to multiplex into the same area to achieve the same Multiple signals are transmitted synchronously in the area. The physical layer framework of the micro-power wireless area coverage power communication private network provided by the present invention can realize short-distance power amplification and area coverage of the communication system. Wireless communication is adopted in an area without laying communication lines. , the system uses a micro-power wireless communication system to ensure the timely and effective transmission of wireless data in the area, thus ensuring the reliability of data communication from the physical layer.

Description

Physical Layer Architecture of Area Coverage Power Communication Private Network for Micropower Wireless

technical field

The invention belongs to the field of power detection equipment, in particular to a physical layer framework for a micro-power wireless area covering power communication private network.

Background technique

The smart grid communication system is currently mainly composed of three communication modes: optical fiber communication system, carrier communication system and wireless communication system. The wireless communication mode mainly refers to the wireless communication mode composed of wireless public networks such as GPRS and 3G. The method has been widely used in the centralized copying of the marketing system and some one-remote and two-remote power distribution terminal systems.

In the existing wireless public network communication system, there are various deficiencies such as high billing fees and incomplete wireless signal coverage. Similarly, in the optical fiber communication system, there are problems such as high construction and laying costs, and in some specific areas, it is not the most suitable communication system solution for large-scale laying and networking. In addition, in the distribution network communication system, equipment laying and 10KV medium-voltage system side, the low-voltage power supply of equipment is a relatively difficult system solution, the main problems are reflected in the following aspects:

In the face of the above-mentioned difficult technical problems in the smart grid, it is more appropriate to use the micro-power wireless system as a communication solution for a specific area in the smart grid system, which mainly solves the following problems in the smart grid system:

Laying cost and difficulty: In the smart grid communication system, the laying of communication lines has always been a difficult construction problem to solve.

The wireless public network cannot fully cover the problem: The wireless public network borrows the wireless public network of the telecom operator. In remote areas, some closed spaces, the coverage of the wireless public network is not complete, resulting in the inability to upload many users and power distribution data in time. The problem of low reliability of wireless communication: due to the use of the wireless public network communication system, due to the shared telecommunications data transmission network, it is relatively easy to be captured or interfered by a large number of irrelevant users, and there is a large security risk.

The problem of low-voltage power supply in the distribution network system: In the remote 10KV distribution network area, the problem of power supply for communication equipment and terminal equipment has always been a major technical problem that plagues the promotion of the system. Using a low-power wireless communication system, by reducing power consumption and active sleep, the power consumption of the device can be reduced to the mw level, and some sites can maintain long-term device operation with battery power supply mode.

To sum up, the regional power communication private network constructed by low-power wireless communication can effectively make up for the unsolvable system problems in the smart grid communication system, and provide a relatively new communication system for the construction of the smart grid communication system. Way.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art, and provide a physical layer framework for a micro-power wireless area coverage power communication private network that provides a relatively new communication method for the construction of a smart grid communication system.

The technical scheme adopted in the present invention is:

A physical layer framework for a micro-power wireless area coverage power communication private network, using a suitable micro-power wireless communication platform as the communication physical layer, including the use of effective data encoding and decoding models, appropriate channel multiplexing technology and hop-based The channel selection technology of frequency technology, in which the channel multiplexing method adopts two data and signal multiplexing models of TDMA+FDMA. Within the selected wireless communication frequency band, multiple sub-frequency bands are used to multiplex into the same area to realize multiplex in the same area. The signals are transmitted synchronously.

Moreover, the micro-power wireless communication platform adopts 230M, 315M, 433M or 868M frequency bands.

Moreover, the micro-power wireless communication platform adopts two frequency bands of 230M or 868M,

Moreover, the encoding and decoding mode of the data encoding and decoding model adopts non-return-to-zero encoding.

Moreover, the channel of the frequency hopping technology adopts the mechanism of sequence frequency hopping to select the frequency band: when the micro-power wireless terminal node needs to send data, the frequency detection is performed at the default frequency point, and in the case of interference in the frequency band, the frequency is hopped according to the The frequency sequence is detected and expanded one by one until the frequency band meets the communication requirements.

Moreover, the transmission power of the micro-power wireless communication platform reaches 24dbm, and the receiving sensitivity reaches -102dBm.

Advantage of the present invention and positive effect are:

The physical layer framework of the micro-power wireless area coverage power communication private network provided by the present invention can realize short-distance power amplification and area coverage of the communication system. Wireless communication is adopted in an area without laying communication lines. , the system uses a micro-power wireless communication system to ensure the timely and effective transmission of wireless data in the area, thus ensuring the reliability of data communication from the physical layer.

Detailed ways:

The present invention will be further described in detail below through the specific examples, the following examples are only descriptive, not restrictive, and cannot limit the protection scope of the present invention with this.

A physical layer framework for a micro-power wireless area coverage electric power communication private network. A suitable micro-power wireless communication platform is used as the communication physical layer, and based on this communication platform, a communication system suitable for electric power wireless private network is constructed. Model, in order to meet the regional coverage communication technology in a certain area, this system will expand the function of the equipment system according to the partial level modules of the OSI seven-layer protocol of the standard network equipment, which is divided into the following parts:

In the construction of a wireless communication system, it is first necessary to select an available wireless frequency band. According to the regulations of the State Radio Regulatory Commission, the available frequency bands are 230M, 315M, 433M, 868M and other frequency bands. Among them, 230M is a dedicated frequency band for electric power wireless communication system. In order to meet the requirements of both the communication distance and the number of communication frequency bands, the research plan of this project uses two frequency bands of 230M or 868M.

In the development of the physical layer, in order to meet the requirements of safe, reliable and efficient data communication, it is necessary to build a robust data communication platform, including the use of effective data encoding and decoding models, appropriate channel multiplexing technology and channel selection technology based on frequency hopping technology , the communication module of the specific physical layer is described as follows:

a. Encoding and decoding method selection: In this system, a relatively effective and simple encoding method can be selected: non-return-to-zero encoding (NRZ).

b. The channel multiplexing mode adopts TDMA+FDMA two data and signal multiplexing models. First, within the selected wireless communication frequency band range, multiple sub-frequency bands are used to multiplex into the same area to realize synchronous transmission of multiple signals in the same area; secondly, when the number of channels is limited and the number of devices is large, there are multiple devices In the case of data multiplexing of a single channel due to sharing the same channel, two data communication modes of CSMA+TDMA are used for data multiplexing of a single channel: the conflict avoidance mechanism of CSMA is used to detect whether there is data conflict in the channel, On the premise that there is no data conflict, the TDMA data model is used to multiplex communication data for multiple sets of data in the same channel.

c. For the frequency band selection problem of the equipment in the frequency band, the frequency band selection can be performed by using the sequence frequency hopping mechanism: when the micro-power wireless terminal node needs to send data, the frequency detection is first performed at the default frequency point, and there is interference in the frequency band Next, detect and expand one by one according to the frequency hopping sequence until the frequency band meets the communication requirements.

To achieve a certain area coverage, it is necessary to develop an enhanced PA module. In the communication environment of the barrier-free model, the unobstructed communication distance is 2KM ~ 3KM; it can penetrate 2 walls within the effective distance. The specific performance indicators are: the sending power reaches 24dbm, and the receiving sensitivity reaches -102dBm.

Although the embodiments of the present invention are disclosed for the purpose of illustration, those skilled in the art will understand that various alternatives, changes and modifications are possible without departing from the spirit and scope of the present invention and the appended claims, therefore However, the scope of the present invention is not limited to the content disclosed in the embodiments.

Claims (6)

1. A physical layer framework for a micro-power wireless area coverage power communication private network, characterized in that: using a suitable micro-power wireless communication platform as the communication physical layer, including the use of effective data codec models, suitable channels Multiplexing technology and channel selection technology based on frequency hopping technology, in which the channel multiplexing method adopts TDMA+FDMA two data and signal multiplexing models within the selected wireless communication frequency band, using multiple sub-frequency bands to multiplex into the same area , to realize the synchronous transmission of multiple signals in the same area. 2. The physical layer framework for micro-power wireless area coverage power communication private network according to claim 1, wherein the micro-power wireless communication platform adopts 230M, 315M, 433M or 868M frequency bands. 3. The physical layer framework for micro-power wireless area coverage power communication private network according to claim 2, characterized in that: said micro-power wireless communication platform adopts two frequency bands of 230M or 868M. 4. The physical layer framework for micro-power wireless area coverage power communication private network according to claim 1, characterized in that: the encoding and decoding method of the data encoding and decoding model adopts non-return-to-zero encoding. 5. The physical layer framework for micro-power wireless area coverage power communication private network according to claim 1, characterized in that: the channel of the frequency hopping technology adopts the mechanism of sequence frequency hopping to select the frequency band: when the micro-power When the power wireless terminal node needs to send data, it performs frequency detection at the default frequency point. If there is interference in the frequency band, it detects and expands one by one according to the frequency hopping sequence until the frequency band meets the communication requirements. 6. The physical layer framework for micro-power wireless area coverage power communication private network according to claim 1, characterized in that: the transmission power of the micro-power wireless communication platform reaches 24dbm, and the receiving sensitivity reaches -102dBm.