Transmission method and system of power wireless private network

Abstract

The invention provides a transmission method and system of a power wireless private network, and the method comprises the steps: selecting a channel group in an available bandwidth range, the channel group comprising a plurality of channels with continuous frequency bands and guard bands located at the front ends and the rear ends of the plurality of continuous channels; based on the configuration mode of the power wireless private network and the configuration parameters of the wireless public network, configuration information of the channel group is reconstructed, and resource blocks are divided according to the configuration information; performing overall low-pass filtering processing on the reconstructed channel group; and transmitting power network information in the processed channel group. The problems of low spectrum utilization rate and high development cost are solved.

Description

Technical Field

[0001] This application relates to the field of communication technology, and in particular to transmission methods and systems for power wireless private networks. Background Technology

[0002] In business scenarios such as power parks, power services are diverse, and the power service data collected by sensors are widely transmitted to the back-end main station using various wireless access technologies such as 5G, WiFi, 230MHz or 1.8GHz power wireless private networks.

[0003] There are two main technologies for power grid wireless private networks: 1.8GHz, using 4G LTE technology; and 230MHz, which uses multiple discrete 25kHz frequencies for transmission, occupying the 223-226MHz and 229-233MHz frequency bands. The State Radio Regulatory Commission issued a document in 2022 prohibiting the power industry from expanding its use of the 1.8GHz power grid wireless private network. Therefore, the 230MHz power grid wireless private network is currently the primary technology available to the power industry.

[0004] However, the current 230MHz power line wireless private network still suffers from low spectrum utilization and high operating costs. Summary of the Invention

[0005] In view of this, the purpose of this application is to propose a transmission method and system for a power wireless private network, which solves the problems of low spectrum utilization and high development cost.

[0006] To achieve one of the aforementioned objectives, this application provides a transmission method for a power wireless private network, the method comprising:

[0007] A channel group is selected within the available bandwidth, the channel group comprising multiple consecutive channels in multiple frequency bands and guard bands located at the front and back ends of the consecutive channels; Based on the configuration method of the power wireless private network and the configuration parameters of the wireless public network, the configuration information of the channel group is reconstructed, and resource blocks are divided according to the configuration information; The reconstructed channel group is subjected to overall low-pass filtering. Power network information is transmitted within the processed channel group.

[0008] As a further improvement of one embodiment of this application, the configuration information includes: air interface frame structure, subcarrier spacing, bandwidth occupied by the effective data portion, and uplink / downlink configuration information.

[0009] As a further improvement of one embodiment of this application, the air interface frame structure adopts a wireless frame with a frame length of 10 milliseconds, the subcarrier spacing is 15 kHz, the bandwidth of the effective data portion occupies 5 resource blocks, the 5 resource blocks occupy a total bandwidth of 900 kHz, the number of baseband fast Fourier transform points is 128, the sampling rate is 1.92 Msps, the guard bands of the front end and the back end each occupy 55 kHz of bandwidth, and the uplink and downlink configuration information is DSUUUUDDDD; Where D represents the downlink subframe, S represents the special subframe, and U represents the uplink subframe; The configuration of the special subframe includes: downlink pilot time slot, guard period and uplink pilot time slot, the downlink pilot time slot corresponds to 8 OFDM symbols, the guard period corresponds to 4 OFDM symbols and the uplink pilot time slot corresponds to 2 OFDM symbols.

[0010] As a further improvement of one embodiment of this application, the air interface frame structure adopts a wireless frame with a frame length of 12 milliseconds, the subcarrier spacing is 12.5 kHz, the bandwidth of the effective data portion occupies 6 resource blocks, and the 6 resource blocks occupy a total bandwidth of 912.5 kHz; the baseband fast Fourier transform number is 128, the sampling rate is 1.6 MHz, the guard bands of the front end and the back end each occupy a bandwidth of 56.25 kHz, and the uplink and downlink configuration information is DSUUUUDDDD; Where D represents the downlink subframe, S represents the special subframe, and U represents the uplink subframe; The configuration of the special subframe includes: downlink pilot time slot, guard period and uplink pilot time slot, the downlink pilot time slot corresponds to 8 OFDM symbols, the guard period corresponds to 4 OFDM symbols and the uplink pilot time slot corresponds to 2 OFDM symbols.

[0011] As a further improvement of one embodiment of this application, the air interface frame structure adopts a wireless frame with a frame length of 20 milliseconds, the subcarrier spacing is 7.5 kHz, the effective data portion bandwidth occupies 6 resource blocks, the 6 resource blocks occupy a total bandwidth of 547.5 kHz, the channel group bandwidth is 600 kHz, the baseband fast Fourier transform number is 128, the sampling rate is 960 kHz, and the uplink and downlink configuration information is DSUUDDSUUD; Where D represents the downlink subframe, S represents the special subframe, and U represents the uplink subframe; The configuration of the special subframe includes: downlink pilot time slot, guard period and uplink pilot time slot, the downlink pilot time slot corresponds to 10 OFDM symbols, the guard period corresponds to 2 OFDM symbols and the uplink pilot time slot corresponds to 2 OFDM symbols.

[0012] As a further improvement of one embodiment of this application, the air interface frame structure adopts a wireless frame with a frame length of 12 milliseconds, the subcarrier spacing is 12.5 kHz, the effective data portion bandwidth occupies 6 resource blocks, the 6 resource blocks occupy a total bandwidth of 912.5 kHz, the channel group bandwidth is 1025 kHz, the baseband fast Fourier transform number is 128, the sampling rate is 1.6 MHz, and the uplink and downlink configuration information is DSUUDDSUUD; Where D represents the downlink subframe, S represents the special subframe, and U represents the uplink subframe; The configuration of the special subframe includes: downlink pilot time slot, guard period and uplink pilot time slot, the downlink pilot time slot corresponds to 10 OFDM symbols, the guard period corresponds to 2 OFDM symbols and the uplink pilot time slot corresponds to 2 OFDM symbols.

[0013] As a further improvement to one embodiment of this application, the transmission of power network information within the processed channel group includes: Configure the framework information used for information transmission; After the dedicated terminal of the power wireless private network is powered on, the dedicated terminal is used to read the firmware pre-configuration, obtain the synchronization carrier frequency information, complete cell identification, and establish a connection between the dedicated terminal and the power wireless private network. Based on the framework information, request uplink data and schedule downlink data.

[0014] As a further improvement to one embodiment of this application, the framework information includes: configuration information of the physical broadcast channel, configuration information of the downlink synchronization sequence, configuration information of the physical random access channel, configuration information of the physical uplink control channel, and configuration information of the physical downlink control channel. The configuration information of the physical broadcast information includes: the time domain transmission period is 40 milliseconds, four transmissions are made in each transmission period, the frame number of the first transmission is 0, the third to fifth OFDM symbols are occupied in the first subframe, and 60 subcarriers are occupied. The configuration information of the downlink synchronization sequence includes: within the first subframe, the secondary synchronization signal is in the sixth OFDM symbol, and the primary synchronization signal is in the seventh OFDM symbol; The configuration information of the physical random access channel includes: a preamble format of 0, a base sequence length of 691, and a random access preamble. The preamble is transmitted in the uplink pilot time slot and the second subframe, occupying the bandwidth of 5 resource blocks. The configuration information of the physical uplink control channel includes: fixed occupation of the two most peripheral resource blocks in the channel group; The configuration information of the physical downlink control channel includes: the first to third OFDM signals occupying each downlink subframe and downlink pilot time slot in the time domain, occupying all subcarriers except the cell reference signal in the frequency domain, the information length of uplink scheduling permission and downlink scheduling assignment is fixed at 16 bits, and no more than two users can be scheduled concurrently in the same subframe.

[0015] As a further improvement to one embodiment of this application, the framework information includes: configuration information of the physical broadcast channel, configuration information of the downlink synchronization sequence, configuration information of the physical random access channel, configuration information of the physical uplink control channel, and configuration information of the physical downlink control channel. The configuration information of the physical broadcast information includes: in the time domain, it occupies the third to fifth OFDM symbols in the first subframe, and in the frequency domain, it occupies 72 subcarriers; The configuration information of the downlink synchronization sequence includes: the primary synchronization signal occupies the seventh OFDM symbol in the first subframe in the time domain and occupies 72 subcarriers in the frequency domain; the secondary synchronization signal occupies the sixth OFDM symbol in the first subframe in the time domain and occupies 72 subcarriers in the frequency domain. The configuration information of the physical random access channel includes: a preamble format of 0, a base sequence length of 839, and a random access preamble. The preamble is transmitted in the uplink pilot time slot and the second subframe, occupying the bandwidth of 6 resource blocks. The configuration information of the physical downlink control channel includes: the first to third OFDM signals occupying each downlink subframe and downlink pilot time slot in the time domain, and 6 resource blocks in the frequency domain.

[0016] Based on the same inventive concept, this application also provides a transmission system for a power wireless private network, comprising: The selection module is used to select a channel group within the available bandwidth range. The channel group includes multiple consecutive channels in multiple frequency bands and guard bands located at the front and back ends of the consecutive channels. The first configuration module reconstructs the configuration information of the channel group based on the configuration method of the power wireless private network and the configuration parameters of the wireless public network, and divides the resource blocks according to the configuration information; The filtering module is used to perform overall low-pass filtering on the reconstructed channel group; A transmission module is used to transmit power network information within the processed channel group.

[0017] Compared to existing technologies, the technical advantages of this invention are as follows: By setting guard bands on both sides of multiple consecutive channels, the spectrum utilization rate can reach approximately 90%, thus improving resource utilization. Based on the configuration information of the channel group reconstructed from the parameters of a mature public wireless network, existing designs are reused, resulting in low technical development difficulty, low R&D and equipment costs across the industry chain, and easier large-scale application in the power industry. It eliminates the need for filtering each signal individually; filtering is only required for the overall combined bandwidth group, resulting in fewer filter orders, lower computational complexity, and lower implementation costs. Furthermore, if future policies change and other available bandwidth ranges are developed, this method exhibits strong adaptability and can flexibly broaden its application scope. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this application or related technologies, the drawings used in the description of the implementation methods or related technologies will be briefly introduced below. Obviously, the drawings described below are only the implementation methods of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of frequency utilization in a channel in the existing technology; Figure 2 A flowchart illustrating a power wireless private network transmission method according to an embodiment of this application; Figure 3 This is a schematic diagram of frequency utilization in a channel according to one embodiment of this application; Figure 4 This is a schematic diagram of a power wireless private network transmission system provided for an embodiment of this application. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional modifications made by those skilled in the art based on these embodiments are included within the scope of protection of the present invention.

[0021] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by those skilled in the art to which this application pertains. The terms "first," "second," and similar terms used in the embodiments of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects.

[0022] Currently, the 230MHz power wireless private network uses dedicated power spectrum resources, occupying 223-226MHz and 229-233MHz, totaling 7MHz bandwidth. It uses discrete channels for aggregation, with each carrier channel at 25kHz. The 3MHz bandwidth includes 119 channels at frequencies of 223.025, ..., 225.975; the 4MHz bandwidth includes 159 channels at frequencies of 229.025, ..., 232.975. Not all of these channels are usable by the power industry; 41 channels are scattered across various sectors, leaving 278 - 41 = 237 channels available to the power industry.

[0023] The State Radio Regulatory Commission requires that the various 25kHz channels not interfere with each other. Therefore, the current power grid private wireless network filters each 25kHz channel separately, such as... Figure 1 As shown, guard bands are provided on both sides to meet radio frequency performance requirements. Currently, it is common practice to reserve 1.5kHz guard bands on both sides in each 25kHz channel, resulting in an overall frequency utilization rate of around 88%, which is relatively low.

[0024] Based on independently configured channels, filtering is also required for each 25kHz channel. The filter implementation is complex, computationally intensive, and the algorithm is complex and difficult to implement.

[0025] In addition, current 4G and 5G public cellular networks typically have bandwidths of 20MHz and 100MHz, and support various other bandwidth configurations. They occupy channel resources in a continuous and centralized manner, using OFDM technology. For example, a typical 4G configuration is a single subcarrier at 15kHz, with an effective channel bandwidth of 18MHz and 100 RBs within a 20MHz bandwidth, where one RB consists of 12 subcarriers. A typical 5G configuration is a single subcarrier at 30kHz, with an effective channel bandwidth of 98.28MHz and 273 RBs within a 100MHz bandwidth.

[0026] The technical standards of 230MHz power grid private networks differ significantly from those of 4G and 5G cellular public networks, resulting in higher industry chain costs for 230MHz power grid private networks, which can be more than 10 times higher than those of 4G and 5G. This high cost further hinders the widespread application of 230MHz power wireless private networks in the power industry, preventing the improvement of the holographic perception and panoramic communication capabilities of the energy internet and impacting the construction progress of new power systems.

[0027] Based on the above technical problems, this application provides a transmission method for a power wireless private network, such as... Figure 2 As shown, it includes the following steps: Step S100: Select a channel group within the available bandwidth. The channel group includes multiple consecutive channels in multiple frequency bands and guard bands located at the front and back ends of the multiple consecutive channels.

[0028] Specifically, such as Figure 3 As shown, only 41 consecutive 25kHz channels from 229MHz to 230MHz are occupied, i.e., the 229.0125-230.0375MHz portion, with a total bandwidth of 1025kHz. Guard bands are reserved only on both sides of the above-mentioned combined bandwidth of 229.0125-230.0375MHz, and the entire transmission bandwidth in the middle is continuously occupied.

[0029] Step S200: Based on the configuration method of the power wireless private network and the configuration parameters of the wireless public network, reconstruct the configuration information of the channel group and divide the resource blocks according to the configuration information.

[0030] Specifically, the public wireless network uses 4G (LTE) and 5G (NR) cellular public network technologies. In the time domain, the smallest resource granularity is an OFDM symbol, and in the frequency domain, the smallest granularity is a subcarrier. An OFDM symbol and a subcarrier together form a time-frequency resource unit. Based on configuration information, wireless resources are divided into resource blocks in both the time and frequency domains.

[0031] In one possible implementation of this application, the configuration information includes: air interface frame structure, subcarrier spacing, bandwidth occupied by the effective data portion, and uplink / downlink configuration information.

[0032] Specifically, by setting the above information, different resource blocks are divided.

[0033] The following are several configuration options: In one of the implementation methods of this application, the air interface frame structure adopts a wireless frame with a frame length of 10 milliseconds, the subcarrier spacing is 15 kHz, the bandwidth of the effective data part occupies 5 resource blocks, and the 5 resource blocks occupy a total bandwidth of 900 kHz.

[0034] Specifically, in order to reuse the existing mature 4G wireless public network industry chain as much as possible, the air interface design for optimized transmission maintains a subcarrier spacing of 15kHz, and the time domain T... s =1 / (15000) 2048)s is the basic time unit. The wireless frame length for uplink and downlink transmission time is 10 milliseconds. Each wireless frame consists of two 5-millisecond half-frames. Each half-frame contains five 1-millisecond subframes. Each subframe contains two 0.5-millisecond time slots.

[0035] The baseband Fast Fourier Transform has 128 points and a sampling rate of 1.92 Msps. The guard bands at the front end and back end each occupy 55kHz of bandwidth, making the bandwidth utilization rate within the channel over 95%.

[0036] Based on the characteristics of uplink and downlink business needs in the power industry, the uplink and downlink configuration information is DSUUUUDDDD.

[0037] Where D represents the downlink subframe, S represents the special subframe, and U represents the uplink subframe.

[0038] The configuration of special subframes is shown in Table 1, including: downlink pilot time slots, guard periods and uplink pilot time slots. The downlink pilot time slots correspond to 8 OFDM symbols, the guard periods correspond to 4 OFDM symbols and the uplink pilot time slots correspond to 2 OFDM symbols.

[0039] Table 1 - Configuration of Special Subframes:

[0040] In the frequency domain, there are 5 resource blocks, totaling 60 subcarriers. The downlink common reference signal, dual-port, and the first OFDM symbol occupying the downlink subframe and downlink pilot time slot in the time domain have a frequency domain density of 1 / 6, and their generation method is the same as LTE.

[0041] In another possible implementation of this application, the air interface frame structure adopts a wireless frame with a frame length of 12 milliseconds, the subcarrier spacing is 12.5 kHz, the bandwidth of the effective data part occupies 6 resource blocks, and the 6 resource blocks occupy a total bandwidth of 912.5 kHz; the number of baseband fast Fourier transform points is 128, the sampling rate is 1.6 MHz, the guard bands of the front end and the back end each occupy 56.25 kHz of bandwidth, and the uplink and downlink configuration information is DSUUUUDDDD.

[0042] Where D represents the downlink subframe, S represents the special subframe, and U represents the uplink subframe.

[0043] The configuration of special subframes includes: downlink pilot time slots, guard periods, and uplink pilot time slots. The downlink pilot time slots correspond to 8 OFDM symbols, the guard periods correspond to 4 OFDM symbols, and the uplink pilot time slots correspond to 2 OFDM symbols.

[0044] In another possible implementation of this application, the air interface frame structure adopts a wireless frame with a frame length of 20 milliseconds, a subcarrier spacing of 7.5 kHz, an effective data portion bandwidth occupying 6 resource blocks, a total bandwidth of 547.5 kHz for the 6 resource blocks, a channel group bandwidth of 600 kHz, a baseband fast Fourier transform point count of 128, a sampling rate of 960 kHz, and uplink / downlink configuration information of DSUUDDSUUD.

[0045] Where D represents the downlink subframe, S represents the special subframe, and U represents the uplink subframe.

[0046] The configuration of special subframes includes: downlink pilot time slots, guard periods, and uplink pilot time slots. The downlink pilot time slots correspond to 10 OFDM symbols, the guard periods correspond to 2 OFDM symbols, and the uplink pilot time slots correspond to 2 OFDM symbols.

[0047] Specifically, based on the above configuration, the current 4G wireless public industry chain can be reused to the maximum extent, minimizing the hardware and software modifications to current LTE base stations and terminals, making them compatible with the 230MHz power line wireless private network. Existing LTE parameters and designs do not require modification, specifically including: the sequence length of the physical random access channel remains 839, and the sequence frequency domain interval remains 1 / 12 of 7.5kHz, i.e., 0.625kHz; due to the corresponding increase in standard time, a format of 0 is sufficient to meet a coverage area of ​​nearly 30 kilometers. The downlink synchronization sequence remains unchanged, with a length of 62 and the time-frequency position unchanged. The timing relationship of the hybrid automatic repeat request for uplink and downlink scheduling remains unchanged, with the overall latency being twice that of LTE. The content and time-frequency position of fields such as MIB / SIB remain unchanged; mechanisms such as Paging and DRX can be used.

[0048] The current 4G LTE hardware and software implementation has an intermediate frequency sampling rate of 30.72Msps, which drops to 1.92Msps when the cell bandwidth is configured with 6RB. The baseband sampling rate in this implementation is 960KHz, which only requires 2x upsampling or 1 / 2 decimation, making it simple to implement.

[0049] In another possible implementation of this application, the air interface frame structure adopts a wireless frame with a frame length of 12 milliseconds, the subcarrier spacing is 12.5 kHz, the bandwidth of the effective data part occupies 6 resource blocks, the 6 resource blocks occupy a total bandwidth of 912.5 kHz, the channel group bandwidth is 1025 kHz, the number of baseband fast Fourier transform points is 128, the sampling rate is 1.6 MHz, and the uplink and downlink configuration information is DSUUDDSUUD.

[0050] Where D represents the downlink subframe, S represents the special subframe, and U represents the uplink subframe.

[0051] The configuration of special subframes includes: downlink pilot time slots, guard periods, and uplink pilot time slots. The downlink pilot time slots correspond to 10 OFDM symbols, the guard periods correspond to 2 OFDM symbols, and the uplink pilot time slots correspond to 2 OFDM symbols.

[0052] Specifically, a subcarrier spacing of 12.5kHz is set, which allows for a 900kHz bandwidth in the frequency domain, improving speed while reusing LTE, and also reducing latency.

[0053] With the current hardware and software implementation, when the cell bandwidth is configured as 6RB, the baseband sampling rate is 1.92Msps and the baseband sampling rate is 1.6MHz. Only 1.2x fractional upsampling or 5 / 6 fractional extraction is required, which increases the implementation complexity.

[0054] Step S300: Perform overall low-pass filtering on the reconstructed channel group.

[0055] Specifically, it is not necessary to filter each 25kHz frequency; only the overall combined continuous bandwidth portion needs to be low-pass filtered. This results in fewer filter orders, lower computational complexity, and simpler implementation.

[0056] Step S400: Transmit power network information within the processed channel group.

[0057] In one possible implementation of this application, step S400 includes: Step S410: Configure the framework information for information transmission.

[0058] Step S420: After the dedicated terminal of the power wireless private network is powered on, the dedicated terminal reads the firmware pre-configuration, obtains the synchronization carrier frequency information, completes cell identification, and establishes a connection between the dedicated terminal and the power wireless private network.

[0059] Step S430: Based on the framework information, request uplink data and schedule downlink data.

[0060] In one possible implementation of this application, the framework information includes: configuration information of the physical broadcast channel, configuration information of the downlink synchronization sequence, configuration information of the physical random access channel, configuration information of the physical uplink control channel, and configuration information of the physical downlink control channel.

[0061] The configuration information for physical broadcast information includes: a time-domain transmission period of 40 milliseconds, four transmissions per transmission period, a frame number of 0 for the first transmission, and the use of the third to fifth OFDM symbols in the first subframe, occupying 60 subcarriers.

[0062] The physical broadcast channel is used to broadcast the most basic system information, namely the master information block. Only by successfully decoding the physical broadcast channel can a dedicated terminal obtain the critical parameters required for subsequent communication. Through periodic repetition and fixed time-frequency positions, the dedicated terminal is ensured to stably and reliably decode the most critical system information after synchronization.

[0063] The configuration information for the downlink synchronization sequence includes: within the first subframe, the secondary synchronization signal is in the sixth OFDM symbol, and the primary synchronization signal is in the seventh OFDM symbol.

[0064] After powering on, the dedicated terminal first searches for signals to complete downlink synchronization and cell identification. The primary synchronization signal and the secondary synchronization signal in the downlink synchronization sequence together form a tight synchronization and broadcast signal block, which facilitates the terminal to quickly obtain network information.

[0065] The configuration information of the physical random access channel includes: a preamble format of 0, a base sequence length of 691, a random access preamble, and the preamble is transmitted in the uplink pilot time slot and the second subframe, occupying the bandwidth of 5 resource blocks.

[0066] When a dedicated terminal needs to establish a connection with the network, it initiates a random access procedure by sending a preamble through the physical random access channel. The purpose is to request uplink synchronization and resource allocation. The bandwidth of the five resource blocks is typically 60 subcarriers, which provides sufficient frequency resources for the preamble to avoid collisions and interference.

[0067] The configuration information for the physical uplink control channel includes: the two most peripheral resource blocks in the fixed-occupancy channel group.

[0068] The dedicated terminal sends uplink control information to the base station through the physical uplink control channel. The physical uplink control channel occupies R80, which is the entire time-domain symbol of the corresponding subframe, and its sequence generation is the same as that of LTE.

[0069] The configuration information of the physical downlink control channel includes: the first to third OFDM signals occupying each downlink subframe and downlink pilot time slot in the time domain, and occupying all subcarriers except the cell reference signal in the frequency domain. The information length of uplink scheduling permission and downlink scheduling assignment is fixed at 16 bits, and no more than two users can be scheduled concurrently in the same subframe.

[0070] The physical downlink control channel is used to notify dedicated terminals how to receive downlink data or how to send uplink data, carrying downlink control information.

[0071] In another possible implementation of this application, the framework information includes: configuration information of the physical broadcast channel, configuration information of the downlink synchronization sequence, configuration information of the physical random access channel, configuration information of the physical uplink control channel, and configuration information of the physical downlink control channel.

[0072] The configuration information for physical broadcast information includes: in the time domain, it occupies the third to fifth OFDM symbols in the first subframe, and in the frequency domain, it occupies 72 subcarriers.

[0073] The configuration information of the downlink synchronization sequence includes: the primary synchronization signal occupies the seventh OFDM symbol in the first subframe in the time domain and occupies 72 subcarriers in the frequency domain; the secondary synchronization signal occupies the sixth OFDM symbol in the first subframe in the time domain and occupies 72 subcarriers in the frequency domain.

[0074] The configuration information of the physical random access channel includes: a preamble format of 0, a base sequence length of 839, a random access preamble, and the preamble is transmitted in the uplink pilot time slot and the second subframe, occupying the bandwidth of 6 resource blocks.

[0075] The configuration information of the physical downlink control channel includes: the first to third OFDM signals occupying each downlink subframe and downlink pilot time slot in the time domain, and 6 resource blocks in the frequency domain.

[0076] Among the above implementation methods, deploying the power wireless private network optimized transmission technology standard in 41 consecutive 25KHz frequencies within the 230MHz band has several advantages.

[0077] First, guard bands are reserved only on both sides of the continuous combined bandwidth. The effective transmission bandwidth in the 1.025MHz continuous bandwidth is about 925kHz, and the spectrum utilization rate can reach 90%, which improves the resource utilization rate.

[0078] Secondly, it does not require filtering for each 25kHz frequency band; it only requires low-pass filtering for the overall combined continuous bandwidth portion. This results in fewer filter orders, lower computational complexity, and simpler implementation.

[0079] Third, the air interface reconstruction design is based on the mature cellular industry chain. The physical layer algorithm and the high-level protocol stack can reuse the existing design as much as possible. The technical development difficulty is low, the R&D and equipment costs of the industry chain are low, and it can be more easily promoted and applied on a large scale in the power industry.

[0080] Fourth, regarding the 6MHz bandwidth of the 230MHz dedicated power frequency band (223-226, 230-233), if the scattered 25KHz frequencies occupied by other industries can be cleared through policy in the future, then the power industry will have two consecutive 3M and 4M bandwidths available (223-226 / 229-233). For the optimization scheme, the bandwidth can be flexibly expanded, the scheme is simple, and it has the ability to be expanded and adapted in the future at low cost.

[0081] Fifth, the optimized transmission technology of this invention can be extended to satellite private networks in the future, resulting in lower channel interference to other industries on the ground. At the same time, it has a higher power spectral density, which can reduce the link gain requirements of terminals, reduce terminal costs, and facilitate industry promotion and application.

[0082] In another embodiment of this application, such as Figure 4 As shown, a transmission system for a power wireless private network is disclosed, comprising: The selection module is used to select a channel group within the available bandwidth. The channel group includes multiple consecutive channels in multiple frequency bands and guard bands located at the front and back ends of the consecutive channels.

[0083] The first configuration module reconstructs the configuration information of the channel group based on the configuration method of the power wireless private network and the configuration parameters of the wireless public network, and divides the resource blocks according to the configuration information.

[0084] The filtering module is used to perform overall low-pass filtering on the reconstructed channel group.

[0085] The transmission module is used to transmit power network information within the processed channel group.

[0086] In one possible implementation of this application, the transmission module includes: The second configuration module is used to configure the framework information for information transmission.

[0087] The connection module is used to read the firmware pre-configuration, obtain the synchronization carrier frequency information, complete cell identification, and establish a connection between the dedicated terminal and the power wireless private network after the dedicated terminal of the power wireless private network is powered on.

[0088] The scheduling module is used to request uplink data and schedule downlink data based on the framework information.

[0089] Based on the same inventive concept, corresponding to any of the above-described embodiments, this application also provides a non-transitory computer-readable storage medium storing computer instructions for causing the computer to execute the power wireless private network transmission method as described in any of the above embodiments.

[0090] The computer-readable medium in this embodiment includes permanent and non-permanent, removable and non-removable media, and information storage can be implemented by any method or technology. Information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic magnetic disk storage or other magnetic storage devices, or any other non-transfer medium that can be used to store information accessible by a computing device.

[0091] The computer instructions stored in the storage medium of the above embodiments are used to cause the computer to execute the power wireless private network transmission method as described in any of the above embodiments, and have the beneficial effects of the corresponding method embodiments, which will not be repeated here.

[0092] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application (including the claims) is limited to these examples; this manner of description is merely for clarity, and those skilled in the art should consider the specification as a whole. Within the framework of this application, the above embodiments or the technical features of different embodiments can also be appropriately combined, the steps can be implemented in any order, and there are many other variations of different aspects of the embodiments of this application as described above, which are not provided in the details for the sake of brevity.

[0093] Additionally, to simplify the description and discussion, and to avoid obscuring the embodiments of this application, the well-known power / ground connections to integrated circuit (IC) chips and other components may or may not be shown in the provided drawings. Furthermore, the apparatus may be shown in block diagram form to avoid obscuring the embodiments of this application, and this also takes into account the fact that the details of the implementation of these block diagram apparatuses are highly dependent on the platform on which the embodiments of this application will be implemented (i.e., these details should be entirely within the understanding of those skilled in the art). While specific details (e.g., circuits) are set forth to describe exemplary embodiments of this application, it will be apparent to those skilled in the art that the embodiments of this application can be implemented without these specific details or with variations thereof. Therefore, these descriptions should be considered illustrative rather than restrictive.

[0094] Although this application has been described in conjunction with specific embodiments thereof, many substitutions, modifications, and variations of these embodiments will be apparent to those skilled in the art from the foregoing description. For example, other memory architectures (e.g., dynamic RAM (DRAM)) may use the embodiments discussed.

[0095] The embodiments described herein are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and principles of the embodiments described herein should be included within the protection scope of this application.

Claims

1. A transmission method of a power wireless private network, characterized by, The method comprises: selecting a channel group in a range of available bandwidth, the channel group comprising a plurality of contiguous channels and guard bands at the front and rear ends of the plurality of contiguous channels; reconfiguring configuration information of the channel group based on the configuration mode of the power wireless private network and the configuration parameters of the wireless public network, and dividing resource blocks according to the configuration information; performing overall low-pass filtering processing on the reconfigured channel group; transmitting power network information in the processed channel group.

2. The transmission method of a power wireless private network according to claim 1, characterized in that, The configuration information comprises air interface frame structure, subcarrier spacing, occupied bandwidth of effective data part, uplink and downlink configuration information.

3. The transmission method of a power wireless private network according to claim 2, characterized in that, The air interface frame structure adopts a wireless frame with a frame length of 10 milliseconds, the subcarrier spacing is 15 kHz, the effective data part bandwidth occupies 5 resource blocks, 5 resource blocks occupy a total bandwidth of 900 kHz, the baseband fast Fourier transform point number is 128, the sampling rate is 1.92 Msps, the front and rear guard bands occupy a bandwidth of 55 kHz respectively, and the uplink and downlink configuration information is DSUUUUDDDD. D is a downlink subframe, S is a special subframe, and U is an uplink subframe. The configuration of the special subframe comprises a downlink pilot time slot, a guard period and an uplink pilot time slot, the downlink pilot time slot corresponds to 8 OFDM symbols, the guard period corresponds to 4 OFDM symbols, and the uplink pilot time slot corresponds to 2 OFDM symbols.

4. The transmission method of the power wireless private network according to claim 2, characterized in that, The air interface frame structure adopts a wireless frame with a frame length of 12 milliseconds, the subcarrier spacing is 12.5 kHz, the effective data part bandwidth occupies 6 resource blocks, 6 resource blocks occupy a total bandwidth of 912.5 kHz, the baseband fast Fourier transform point number is 128, the sampling rate is 1.6 MHz, the front and rear guard bands occupy a bandwidth of 56.25 kHz respectively, and the uplink and downlink configuration information is DSUUUUDDDD. D is a downlink subframe, S is a special subframe, and U is an uplink subframe. The configuration of the special subframe comprises a downlink pilot time slot, a guard period and an uplink pilot time slot, the downlink pilot time slot corresponds to 8 OFDM symbols, the guard period corresponds to 4 OFDM symbols, and the uplink pilot time slot corresponds to 2 OFDM symbols.

5. The transmission method of a power wireless private network according to claim 2, characterized in that, The air interface frame structure adopts a wireless frame with a frame length of 20 milliseconds, the subcarrier spacing is 7.5 kHz, the effective data part bandwidth occupies 6 resource blocks, 6 resource blocks occupy a total bandwidth of 547.5 kHz, the channel group bandwidth is 600 kHz, the baseband fast Fourier transform point number is 128, the sampling rate is 960 kHz, and the uplink and downlink configuration information is DSUUDDSUUD. D is a downlink subframe, S is a special subframe, and U is an uplink subframe. The configuration of the special subframe comprises a downlink pilot time slot, a guard period and an uplink pilot time slot, the downlink pilot time slot corresponds to 10 OFDM symbols, the guard period corresponds to 2 OFDM symbols, and the uplink pilot time slot corresponds to 2 OFDM symbols.

6. The transmission method of a power wireless private network according to claim 2, characterized in that, The air interface frame structure adopts a wireless frame with a frame length of 12 ms, a subcarrier spacing of 12.5 kHz, an effective data part bandwidth occupying 6 resource blocks, 6 resource blocks occupying a bandwidth of 912.5 kHz, a channel group bandwidth of 1025 kHz, a baseband fast Fourier transform point number of 128, and a sampling rate of 1.6 MHz, and the uplink and downlink configuration information is DSUUDDSUUD; wherein D is a downlink subframe, S is a special subframe, and U is an uplink subframe; The configuration of the special subframe includes a downlink pilot time slot, a guard period, and an uplink pilot time slot, the downlink pilot time slot corresponds to 10 OFDM symbols, the guard period corresponds to 2 OFDM symbols, and the uplink pilot time slot corresponds to 2 OFDM symbols.

7. The transmission method of a power wireless private network according to claim 1, characterized in that, The transmission of power network information in the processed channel group includes: configuring framework information for information transmission; After a dedicated terminal of the power wireless private network is powered on, the dedicated terminal reads firmware pre-configuration to obtain synchronization carrier frequency information, complete cell identification, and establish a connection between the dedicated terminal and the power wireless private network; According to the framework information, uplink data is applied and downlink data is scheduled.

8. The transmission method of a power wireless private network according to claim 7, characterized in that, The framework information includes configuration information of a physical broadcast channel, configuration information of a downlink synchronization sequence, configuration information of a physical random access channel, configuration information of a physical uplink control channel, and configuration information of a physical downlink control channel. The configuration information of the physical broadcast information includes a transmission period of 40 ms in the time domain, four transmissions in each transmission period, a frame number of 0 for the first transmission, occupation of the third to fifth OFDM symbols in the first subframe, and occupation of 60 subcarriers. The configuration information of the downlink synchronization sequence includes a secondary synchronization signal in the sixth OFDM symbol and a primary synchronization signal in the seventh OFDM symbol in the first subframe. The configuration information of the physical random access channel includes a preamble format of 0, a base sequence length of 691, a random access preamble, transmission of the preamble on the uplink pilot time slot and the second subframe, and occupation of a bandwidth of 5 resource blocks. The configuration information of the physical uplink control channel includes fixed occupation of the two most edge resource blocks in the channel group. The configuration information of the physical downlink control channel includes occupation of the first to third OFDM signals of each downlink subframe and downlink pilot time slot in the time domain and occupation of all subcarriers except cell reference signals in the frequency domain, and the information length of uplink scheduling permission and downlink scheduling assignment is fixed at 16 bits, and no more than two users are concurrently scheduled in the same subframe.

9. The transmission method of a power wireless private network according to claim 7, characterized in that, The framework information includes configuration information of a physical broadcast channel, configuration information of a downlink synchronization sequence, configuration information of a physical random access channel, configuration information of a physical uplink control channel, and configuration information of a physical downlink control channel. The configuration information of the physical broadcast information includes occupation of the third to fifth OFDM symbols in the first subframe in the time domain and occupation of 72 subcarriers in the frequency domain. The configuration information of the downlink synchronization sequence includes: a primary synchronization signal occupies the seventh OFDM symbol in the first subframe in the time domain and 72 subcarriers in the frequency domain; and a secondary synchronization signal occupies the sixth OFDM symbol in the first subframe in the time domain and 72 subcarriers in the frequency domain. The configuration information of the physical random access channel includes: a preamble format of 0, a base sequence length of 839, a random access preamble, the preamble is transmitted on the uplink pilot time slot and the second subframe, and occupies a bandwidth of 6 resource blocks. The configuration information of the physical downlink control channel includes: occupying the first to third OFDM signals of each downlink subframe and downlink pilot time slot in the time domain, and occupying 6 resource blocks in the frequency domain.

10. A transmission system of a power wireless private network, characterized by, The system comprises: a selection module configured to select a channel group in an available bandwidth range, the channel group comprising a plurality of contiguous channels and guard bands located at the front and rear ends of the plurality of contiguous channels; a first configuration module configured to reconstruct configuration information of the channel group based on a configuration mode of the power wireless private network and configuration parameters of a wireless public network, and to divide resource blocks according to the configuration information; a filtering module configured to perform overall low-pass filtering on the reconstructed channel group; and a transmission module configured to transmit power network information in the processed channel group.

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