Wireless network communication method and device based on lead code detection

Abstract

The invention discloses a wireless network communication method and device based on lead code detection. The invention relates to the technical field of wireless communication, and aims to solve the problem of communication link interruption caused by interference of a main channel in a high-broadband wireless communication system. The method comprises the following steps: a receiving end monitors a main channel and a dynamically configured sub-channel in parallel within a system bandwidth range, and synchronously executes physical layer lead code detection on the main channel and the sub-channel; when a receiving end detects the physical layer lead code in any one of the main channel and the sub-channel, triggering a complete signal receiving process; and when a receiving end simultaneously detects the physical layer lead code in the main channel and the sub-channel, the receiving end selects a signal of one channel from the main channel and the sub-channel to perform subsequent analysis according to a preset arbitration strategy. The method can break through the dependence of a main channel, supports all types of interference scenes, and is high in compatibility.

Description

Technical Field

[0001] This invention relates to the field of wireless communication technology, and in particular to a wireless network communication method and apparatus based on preamble detection. Background Technology

[0002] In modern high-throughput wireless communication systems, channel bonding technology is commonly used to improve spectral efficiency, aggregating multiple adjacent channels into a wideband for high-bandwidth data transmission. In this architecture, the system typically designates a primary channel as the anchor point for control signaling and basic access, while the remaining channels are used to enhance data throughput. Under this architecture, if the primary channel is interfered with, the entire communication link will be forced to shut down regardless of the availability of the remaining channels, severely limiting system robustness. For example, the IEEE 802.11be (Wi-Fi 7) standard, even while supporting preamble puncturing to avoid interference from non-primary channels, explicitly prohibits puncturing the primary channel (see 802.11be-2023) to ensure protocol compatibility and control plane stability.

[0003] To mitigate primary channel interference, some next-generation standards, such as the NPCA mechanism in the Wi-Fi 8 draft, attempt to introduce Non-Primary Channel Access (NPCA) capabilities, allowing devices to temporarily switch to the NPCA channel to maintain communication when the primary channel is interfered with. However, such solutions still have significant limitations: on the one hand, their interference detection and switching mechanisms are mostly only for Wi-Fi protocol interference, lacking the ability to detect and respond to cross-protocol interference sources such as Bluetooth, radar, and ZigBee; on the other hand, the mandatory requirement to switch back to the primary channel before the end of the interference source's transmission opportunity (TXOP) leads to frequent channel oscillations, a surge in control overhead, and unstable throughput, significantly reducing practicality.

[0004] Main channel interference is a widespread problem in wireless systems employing a "main-secondary channel" architecture, such as Wi-Fi and WIA-FA. Therefore, there is an urgent need for a main channel interference avoidance mechanism that can resist any type of interference and seamlessly maintain communication continuity, in order to break through the technical constraints of current standards and achieve truly robust broadband wireless communication. Summary of the Invention

[0005] The purpose of this invention is to provide a wireless network communication method and apparatus based on preamble detection, so as to solve the problem of communication link interruption caused by interference with the main channel in high-bandwidth wireless communication systems.

[0006] In a first aspect, the present invention provides a wireless network communication method based on preamble detection, applied at a transmitting end, the method comprising: Each channel is detected according to a predetermined period, and the main channel and at least one sub-channel are determined based on the detection results; A management frame is constructed based on the detection results and sent to the receiving end. The management frame includes available channel information, which includes a main channel and at least one sub-channel. The available channels are determined according to the management frame, and the physical layer preamble is copied on the available channels to construct and send data frames. The physical layer preamble includes a long training field preamble, a long training field, a traditional signal field, a repeated signal field, a general signal field, and an extremely high throughput signal field.

[0007] Furthermore, according to a predetermined dynamic strategy, the predetermined channel is determined as the sub-channel.

[0008] Furthermore, the predetermined dynamic strategy specifically involves detecting at least one of the received signal strength, cyclic redundancy check error rate, and air interface occupancy rate of the channel within a predetermined range at a predetermined period, and determining the sub-channel based on the detection results.

[0009] Furthermore, the management frame includes one or more of element identifiers, length, organization identifiers, and sub-channel information.

[0010] Furthermore, the element identifier is used to identify the field type; The length is used to indicate the length of the custom field that follows; The organization identifier is used to identify the manufacturer; The sub-channel information is used to indicate the offset relationship of the sub-channel relative to the main channel.

[0011] Furthermore, the value range of the sub-channel information represents the 1st to 15th 20MHz channels on the left or right side of the main channel.

[0012] Secondly, the present invention provides a wireless network communication method based on preamble detection, applied at a receiving end, the method comprising: Receive management frames and update the local communication configuration according to the management frames; According to the updated local communication configuration, the available channels are monitored in parallel, and the physical layer preamble is detected synchronously. Determine whether the number of channels that have detected the physical layer preamble is greater than one; if not, trigger the receiving process by detecting the channel that has detected the physical layer preamble; if yes, select a predetermined channel from the channels that have detected the physical preamble according to a preset arbitration strategy and trigger the receiving process.

[0013] Furthermore, the arbitration strategy includes: determining whether the main channel detects a physical preamble; if so, selecting the main channel to trigger the reception process; if not, selecting a sub-channel to trigger the reception process.

[0014] Thirdly, the present invention provides a wireless network communication device based on preamble detection, applied at the transmitting end, the device comprising: The first analysis unit is used to detect each channel according to a predetermined period and determine the main channel and at least one sub-channel based on the detection results. A management frame generation unit is configured to construct a management frame based on the detection result and send the management frame to the receiving end. The management frame includes available channel information, and the available channels include a main channel and at least one sub-channel. A data frame generation unit is configured to determine an available channel based on the management frame, copy a physical layer preamble on the available channel, and construct and transmit a data frame. The physical layer preamble includes a long training field preamble, a long training field, a traditional signal field, a repeated signal field, a general signal field, and an extremely high throughput signal field.

[0015] Fourthly, the present invention provides a wireless network communication device based on preamble detection, applied at a receiving end, the device comprising: The receiving unit is configured to receive management frames and update the local communication configuration according to the management frames; A listening unit, which is used to listen to the available channels in parallel according to the updated local communication configuration, and synchronously detect the physical layer preamble; The second analysis unit determines whether the number of channels that detect the physical layer preamble is greater than one; if not, it triggers the receiving process by detecting the channels of the physical layer preamble; if yes, it selects a predetermined channel from the channels that detect the physical preamble according to a preset arbitration strategy and triggers the receiving process.

[0016] This invention offers the following advantages: A wireless network communication method and apparatus based on preamble detection overcomes the dependence on the main channel. By simultaneously performing preamble detection on both the main and sub-channels, it significantly improves the robustness of reception initiation, enabling continued communication even when the main channel is interfered with. This invention supports all types of interference scenarios, handling not only interference from other devices using the same protocol but also effectively dealing with interference from Bluetooth, radar, and other sources. Furthermore, this invention boasts strong compatibility, maintaining the encoding and transmission methods at the transmitting end while adding sub-channel monitoring and arbitration logic at the receiving end. It is compatible with existing standard frame structures and is easy to deploy and implement. Attached Figure Description

[0017] To more clearly illustrate the technical solution of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the ETH MU frame format as specified in 802.11be; Figure 2 This is a schematic diagram illustrating interference to the non-primary channel in a traditional scheme. Figure 3 A schematic diagram illustrating the interference experienced by the main channel after enabling the dual-channel preamble detection mechanism; Figure 4 This is an example diagram of a sub-channel negotiation mechanism. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention. The technical solutions provided by various embodiments of this invention will be described in detail below with reference to the accompanying drawings.

[0020] This invention provides a wireless network communication method and apparatus based on preamble detection, applicable to high-bandwidth wireless systems employing a primary-secondary channel architecture, such as Wi-Fi and WIA-FA. The method includes: a receiver, within the system bandwidth, simultaneously monitoring a primary channel and a dynamically configured secondary channel, and synchronously performing physical layer preamble detection on both the primary and secondary channels (backup channels). When the receiver detects a physical layer preamble on either the primary or secondary channel, a complete reception process is triggered, no longer forcibly relying on the primary channel as the sole entry point. When the receiver detects a physical layer preamble on both the primary and secondary channels simultaneously, it selects the signal from one of the primary and secondary channels for subsequent analysis according to a preset arbitration strategy, ignoring redundant information from the other channel to avoid redundant calculations and resource waste.

[0021] In existing wireless communication technologies, while the transmitter replicates the traditional preamble on each channel, the receiver only initiates the reception process when the preamble is detected on the main channel. To ensure that traditional devices can recognize the signal, the protocol stipulates that the main channel must always be available and cannot be punctured. Once the main channel is interfered with, even if the signals on other channels are normal, the receiver cannot start, and communication is interrupted. This application proposes a dual-channel preamble detection mechanism. During high-bandwidth communication, the receiver simultaneously monitors the main channel and a dynamically selected sub-channel. Detection of the preamble on any sub-channel triggers the reception process, no longer relying solely on the main channel. When the main channel is subjected to any type of interference, the receiver uses the preamble on the channel to obtain bandwidth and puncturing information, thereby skipping the interference band of the main channel and correctly receiving the remaining channel data. Furthermore, an arbitration mechanism can be set so that when the preamble is detected on multiple channels simultaneously, only one signal is decoded, eliminating the need for repeated decoding.

[0022] like Figure 1 As shown, in a typical frame structure, the physical layer preamble includes traditional preambles such as Long Training Field Preamble (L-STF), Long Training Field (L-LTF), Traditional Signal Field (L-SIG), and Repeated Signal Field (RL-SIG), as well as control fields such as Universal Signal Field (U-SIG), Extremely High Throughput Signal Field (EHT-SIG), Extremely High Throughput Short Training Field (EHT-STF), and Extremely High Throughput Long Training Field (EHT-LTF). It also includes data and padding (PE). The transmitter replicates the aforementioned traditional preambles and universal signal fields on each available 20MHz channel (including a defined main channel and sub-channels), but not on punctured channels. At the receiver, the traditional scheme only performs preamble detection on the main channel. If this channel is interfered with, the reception process cannot start. Therefore, when the main channel is interfered with, even if all sub-channels are clean and available, the transmitter will not choose to transmit but will back off and wait until the main channel becomes available. Figure 2 As shown, in the traditional scheme, when the non-main channel is interfered with, the interference frequency band can be bypassed and communication can continue through preamble punching technology. However, when the main channel is interfered with, communication can only be interrupted.

[0023] Using the technical solution of this application, the receiver is designed to perform preamble detection simultaneously on both the main channel and sub-channels. When the main channel is interfered with, the preamble can be detected through the sub-channels, and data can be received in the effective sub-channels. This significantly improves the link stability and spectrum utilization of the system in non-ideal channel environments. Figure 3 As shown, after enabling the dual-channel preamble detection mechanism, when the main channel is interfered with, the preamble can be received through the sub-channel, the punching information can be obtained through the preamble, the interfered main channel can be bypassed, and communication can continue.

[0024] To support flexible deployment and environmental adaptability of subchannels, this invention introduces a Backup Channel Operation Element (PSA). The subchannel configuration method includes: network coordination nodes such as wireless access points (APs), base stations, or industrial gateways periodically detecting Received Signal Strength Indicator (RSSI), Cyclic Redundancy Check (CRC) error rate, and air interface occupancy rate. Based on the detection results, the channel with the least interference is selected as the subchannel, and the PSA is sent via a management frame. After receiving and parsing the PSA, the receiving end updates its local subchannel configuration based on the parsing result and initiates a dual-channel preamble detection mechanism. A typical configuration process is as follows: Figure 4 As shown, Figure 4 This is an example of an Access Point (AP) using beacon frames to transmit parameters in a Wi-Fi protocol. The AP periodically detects interference on all channels, selects the channel with the least interference, places it in sub-channel information, and then transmits it to all wireless terminals (STAs) via beacon information (management frames). After receiving the beacon, the STA extracts the sub-channel information and activates its dual-channel detection mechanism.

[0025] The subchannel operation information element includes one or more of the following: Element ID, Length, Organization Identifier, and Backup Channel Info. The Backup Channel Info field is mandatory; other fields are adapted based on the actual network mediation node. The Element ID identifies the field type; in this embodiment, it is 221, indicating a vendor-defined element. The Length field indicates the length of the subsequent custom field. The Organization Identifier identifies the vendor. The Backup Channel Info indicates the offset of the subchannel relative to the main channel, and its value range represents the 1st to 15th 20MHz channel to the left or right of the main channel. Specifically, 0x0 indicates the subchannel function is disabled; 0x01-0x0f indicates the right-side channel of the main channel; and 0x11-0x1f indicates the left-side channel of the main channel.

[0026] When both the main channel and the sub-channel detect the physical layer preamble, the receiver must select one channel as the parsing target according to arbitration rules. Common arbitration rules include main channel priority, signal-to-noise ratio priority, and first-come-first-served strategies. Considering communication latency, this application chooses a lightweight main channel priority strategy as the arbitration strategy. When the main channel does not detect the physical layer preamble but the sub-channel does, the sub-channel is used to receive and parse the signal. When both the main channel and the sub-channel receive the physical layer preamble, the main channel is directly selected to receive and parse the signal. The purpose is to enter the receiving state as quickly as possible when two signals are received simultaneously, as using more complex algorithms may lead to reception delay. The characteristics of this strategy are main channel priority and sub-channel fallback, which can guarantee the lowest latency when the main channel is working normally and ensure communication stability when the main channel is interfered with.

[0027] The technical solution of the present invention will be described in detail below with reference to specific embodiments.

[0028] Example 1: 160M bandwidth transceiver scenario with main channel interference. In this example, it is assumed that the system operates at a 160M bandwidth.

[0029] Channel Negotiation: The network coordinating node periodically checks each 20MHz channel within the 160MHz bandwidth and finds that the third 20MHz channel to the right of the main channel has the least interference. Therefore, the network coordinating node includes a sub-channel operation information element in the management frame, where the sub-channel information field is set to "0x03", indicating that the third channel to the right of the main channel is a sub-channel. The terminal device receives and parses this information element, updates its local sub-channel configuration, and simultaneously enables the sub-channel preamble detection logic outside of the main channel.

[0030] Data transmission by the transmitter: The network coordinating node prepares to send a data frame to the terminal device. Before transmission, the transmitter detects interference on the primary 20MHz channel, but the sub-channel is available. Because dual-channel preamble detection is enabled, the transmitter can trigger the physical layer preamble puncturing mechanism, marking the primary channel as punctured and preventing the transmission of preamble and data on that channel. The transmitter then replicates the traditional preamble normally on the remaining 140MHz bandwidth, encodes the remaining preamble and data portion on the available bandwidth, and transmits the data frame.

[0031] Dual-channel detection at the receiver: The terminal device simultaneously listens to both the main channel and the sub-channel during reception. Due to puncturing of the main channel, the receiver did not detect a valid preamble on the main channel, while the sub-channel still received a complete physical layer preamble. After detecting the sub-channel preamble, the terminal device immediately initiates the reception process, parses the preamble, and obtains the configuration information of the punctured main channel. Based on the puncturing information in the preamble, the receiver blocks the main 20MHz channel and decodes the remaining 140MHz valid channel, successfully recovering the complete data frame.

[0032] Through this embodiment, even if the main channel is interfered with, the system can still rely on the sub-channel to complete communication smoothly, avoiding the problem of communication interruption due to interference in the main channel under traditional receiving methods.

[0033] Example 2: 160MHz bandwidth transceiver scenario with no interference on the main channel. In this example, it is also assumed that the system operates at a bandwidth of 160MHz.

[0034] Channel Negotiation: The network coordinating node periodically checks each 20MHz channel within the 160MHz bandwidth and finds that the third 20MHz channel to the right of the main channel has the least interference. Therefore, the network coordinating node includes a sub-channel operation information element in the management frame, where the sub-channel information field is set to "0x03", indicating that the third channel to the right of the main channel is a sub-channel. The terminal device receives and parses this information element, updates its local sub-channel configuration, and simultaneously enables the sub-channel preamble detection logic outside of the main channel.

[0035] Data transmission at the sending end: During data transmission, the network coordinating node detects that the main channel is normal and no puncturing is required. Therefore, it simultaneously replicates the traditional preamble over the entire 160MHz bandwidth, encodes the remaining data over the entire available bandwidth, and sends data frames according to the standard procedure.

[0036] Dual-channel detection at the receiving end: When receiving, the terminal detects the preamble signal on both the main channel and the sub-channel simultaneously, thus obtaining two preamble signals.

[0037] Arbitration Selection: According to the arbitration rules, the terminal device prioritizes parsing the preamble of the main channel, ignoring redundant information from the sub-channels. Using the preamble of the main channel, the receiver obtains the bandwidth and channel mapping information and enters the normal data decoding process. Based on the parameters of the main channel, the terminal device completes data demodulation and decoding on a 160MHz bandwidth, successfully recovering the data frame.

[0038] In this embodiment, under normal main channel conditions, the arbitration mechanism avoids redundant parsing at the receiving end, ensuring the lowest latency and best performance.

[0039] In summary, this invention constructs a dual-channel physical layer preamble parallel detection mechanism by dynamically configuring a backup channel within the system bandwidth. This enables the receiving device to trigger the reception process as soon as a valid preamble is successfully detected on either the main channel or the sub-channel. Therefore, when the main channel suffers any type of interference, including interference from other devices using the same protocol, devices using different protocols such as Bluetooth / radar, or burst noise, the receiving end can rely on the preamble transmitted on the backup channel to parse the channel state and puncturing pattern, skip the interfered frequency band, and recover data frames from the available sub-channel, achieving seamless communication maintenance even under main channel interference.

[0040] The above embodiments of the present invention do not constitute a limitation on the scope of protection of the present invention.

Claims

1. A wireless network communication method based on preamble detection, characterized in that, Applied to the sending end, the method includes: Each channel is detected according to a predetermined period, and the main channel and at least one sub-channel are determined based on the detection results; A management frame is constructed based on the detection results and sent to the receiving end. The management frame includes available channel information, which includes a main channel and at least one sub-channel. The available channels are determined according to the management frame, and the physical layer preamble is copied on the available channels to construct and send data frames. The physical layer preamble includes a long training field preamble, a long training field, a traditional signal field, a repeated signal field, a general signal field, and an extremely high throughput signal field.

2. The wireless network communication method based on preamble detection as described in claim 1, characterized in that, According to a predetermined dynamic strategy, a predetermined channel is determined as the sub-channel.

3. The wireless network communication method based on preamble detection as described in claim 2, characterized in that, The predetermined dynamic strategy specifically involves detecting at least one of the received signal strength, cyclic redundancy check error rate, and air interface occupancy rate of the channel within a predetermined range at predetermined intervals, and determining the sub-channel based on the detection results.

4. The wireless network communication method based on preamble detection as described in claim 1, characterized in that, The management frame includes one or more of element identifiers, length, organization identifiers, and sub-channel information.

5. The wireless network communication method based on preamble detection as described in claim 4, characterized in that, The element identifier is used to identify the field type; The length is used to indicate the length of the custom field that follows; The organization identifier is used to identify the manufacturer; The sub-channel information is used to indicate the offset relationship of the sub-channel relative to the main channel.

6. The wireless network communication method based on preamble detection as described in claim 5, characterized in that, The range of values ​​for the sub-channel information represents the 1st to 15th 20 MHz channels to the left or right of the main channel.

7. A wireless network communication method based on preamble detection, characterized in that, Applied to the receiving end, the method includes: Receive management frames and update the local communication configuration according to the management frames; According to the updated local communication configuration, the available channels are monitored in parallel, and the physical layer preamble is detected synchronously. Determine whether the number of channels that have detected the physical layer preamble is greater than one; if not, trigger the receiving process by detecting the channel that has detected the physical layer preamble; if yes, select a predetermined channel from the channels that have detected the physical preamble according to a preset arbitration strategy and trigger the receiving process.

8. The wireless network communication method based on preamble detection as described in claim 7, characterized in that, The arbitration strategy includes: Determine whether the main channel detects a physical preamble; if yes, select the main channel to trigger the receiving process; if no, select the sub-channel to trigger the receiving process.

9. A wireless network communication device based on preamble detection, characterized in that, Applied to the transmitting end, the device includes: The first analysis unit is used to detect each channel according to a predetermined period and determine the main channel and at least one sub-channel based on the detection results. A management frame generation unit is configured to construct a management frame based on the detection result and send the management frame to the receiving end. The management frame includes available channel information, and the available channels include a main channel and at least one sub-channel. A data frame generation unit is configured to determine an available channel based on the management frame, copy a physical layer preamble on the available channel, and construct and transmit a data frame. The physical layer preamble includes a long training field preamble, a long training field, a traditional signal field, a repeated signal field, a general signal field, and an extremely high throughput signal field.

10. A wireless network communication device based on preamble detection, characterized in that, Applied to the receiving end, the device includes: The receiving unit is configured to receive management frames and update the local communication configuration according to the management frames; A listening unit, which is used to listen to the available channels in parallel according to the updated local communication configuration, and synchronously detect the physical layer preamble; The second analysis unit determines whether the number of channels that detect the physical layer preamble is greater than one; if not, it triggers the receiving process by detecting the channels of the physical layer preamble; if yes, it selects a predetermined channel from the channels that detect the physical preamble according to a preset arbitration strategy and triggers the receiving process.

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