A centralized control and processing system for WiFi signals based on all-optical access

Abstract

This invention provides a centralized control and processing system for WiFi signals based on all-optical access. It includes several simplified AP devices with streamlined components and functions, an all-optical wireless controller connected to the AP devices via optical cables, a core switch connected to the all-optical wireless controller, an integrated service gateway connected to the core switch, and a management platform. The advantages of this invention are: the AP devices use a WiFi main chip + all-optical direct access control method, eliminating the need for a main control SOC, DDR, and FLASH, thus saving significant equipment costs and power consumption. All WiFi signals are transmitted to the remote all-optical wireless controller for centralized processing via a PCIe interface and optical modules. The all-optical wireless controller also uses all-optical access and a high-performance CPU to process the incoming AP data signals. Thus, signal processing, signal switching, network management, and maintenance are all handled at the central office, simplifying remote equipment and management, and saving labor and equipment costs.

Description

Technical Field

[0001] This invention relates to the field of centralized control and processing technology for WiFi signals, and in particular to a centralized control and processing system for WiFi signals based on all-optical access. Background Technology

[0002] Wireless WiFi coverage converts wired networks into wireless signals through wireless access points, achieving widespread coverage of Wireless Local Area Networks (WLANs). The core advantages of wireless WiFi coverage lie in providing convenient mobile access and cost-effectiveness. It allows mobile devices such as smartphones and tablets to freely connect to the network within the coverage area, meeting the needs of remote work, online education, and streaming entertainment, avoiding cabling limitations. It is particularly suitable for high-density environments with many devices, such as homes, offices, or public places, and improves network efficiency through smart antennas and spectrum management technologies. Technological evolution continuously optimizes the performance and adaptability of wireless WiFi coverage. New technologies such as Wi-Fi 6 and Wi-Fi 7 introduce OFDMA and MU-MIMO, significantly improving spectrum efficiency and network throughput under high-density user conditions. Mesh networking solutions achieve seamless roaming through distributed nodes, solving the problem of signal blind spots, while technologies such as dynamic spectrum access alleviate spectrum congestion and ensure service quality.

[0003] The main application architectures for current large-scale WiFi coverage are as follows: Figure 1 As shown, the composition and process of mainstream large-scale WiFi coverage architecture: 1. Centralized architecture (AC+Fit AP architecture): Figure 1 This is the most classic and widely used large-scale WiFi coverage architecture, with the core logic of "centralized management + distributed access". The core components are: the wireless controller (AC, AccessController) is used as the core management node to uniformly manage all AP devices; the AP devices (Fit AP, Fitness AccessPoint) have no independent configuration capabilities and are only responsible for radio frequency signal transmission and reception; the switch (PoE switch) provides power (PoE) to the AP and transmits data, and is connected to the AC; the core switch is used to connect the AC to the upper-layer network and is responsible for high-speed data forwarding; the management platform is used to monitor the Mesh topology and optimize the backhaul link.

[0004] 2. Deployment and Workflow: 2.1 Gateway AP Deployment: Deploy gateway APs in areas with wired network access as the root node of the Mesh network, connecting to the core switch. 2.2 Node AP Deployment: Deploy node APs in areas without wired network coverage. After power-on, they automatically establish wireless links (Mesh backhaul) with neighboring APs, forming a self-organizing network topology. 2.3 Link Optimization: Mesh APs automatically select the link with the best signal quality as the backhaul path. When a link is interrupted, they automatically switch to a backup link (self-healing capability). 2.4 User Access: Terminals access the nearest Mesh AP. Data is forwarded to the gateway AP via multi-hop Mesh links and then accesses the core network; cross-node roaming is supported, but roaming latency is higher than the AC+Fit AP architecture.

[0005] II. Major Disadvantages of Mainstream Architectures: 1. Disadvantages of Centralized Architecture (AC + Fit AP): 1.1 High cabling costs and poor flexibility: All Fit APs need to be connected to a PoE switch via network cables. In large-scale scenarios (such as multi-story shopping malls and parks), the cabling workload is large and costly. If additional APs are needed later, network cable coverage is required, resulting in low expansion flexibility. 1.2 Roaming experience is limited by AC performance: Although it supports 802.11k / v / r protocols for seamless roaming, the AC's processing capacity determines the latency of roaming handover. When the number of users is too large, the authentication and forwarding pressure on the AC increases, which may lead to roaming stuttering (such as voice call disconnection). 1.3 Channel interference is difficult to completely avoid: Although the AC can automatically allocate channels, in high-density AP deployment scenarios (such as convention centers), signal overlap between adjacent APs will still cause interference, requiring manual fine-tuning.

[0006] 2. Disadvantages of Distributed Architecture (Wireless Mesh): 2.1 Significant Bandwidth Attenuation: Mesh networks use multi-hop transmission, resulting in approximately 50% bandwidth attenuation with each node forwarding. For example, the actual usable bandwidth of a 3-hop Mesh link is only 1 / 8 of the original bandwidth, failing to meet the demands of high-bandwidth services (such as 4K video and large file transfers). 2.2 High Roaming Latency and Poor Stability: Roaming between AP nodes requires re-establishing links, typically resulting in latency exceeding 100ms, significantly higher than the AC+Fit AP architecture (<50ms). Furthermore, the wireless backhaul link is susceptible to environmental interference (such as wall obstructions and electromagnetic interference), leading to network jitter. 2.3 Power Consumption and Cost Issues: Mesh APs must simultaneously handle both user access and backhaul tasks, resulting in higher power consumption than ordinary Fit APs. Moreover, to ensure coverage, more AP nodes need to be deployed, leading to substantial hardware costs. 2.4 High management complexity After the Mesh topology is automatically generated, the load balancing of the links depends on the algorithm of the management platform; when there are too many nodes, the topology becomes complex and troubleshooting becomes difficult (such as it is difficult to locate which node's link is having a problem).

[0007] As WiFi technology advances, its bandwidth will increase, and the transmission speed of network cables will continue to improve. This also increases the cost of equipment and network cables, making the use of fiber optic cables a growing trend. The cost of optical transmission at speeds of tens of Gbps has also decreased, perfectly meeting the speed growth requirements of WiFi 6 and WiFi 7. Summary of the Invention

[0008] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide a centralized control and processing system for WiFi signals based on all-optical access, which solves the problems of high cabling costs, poor flexibility, and roaming experience limited by AC performance in the current general application architecture for large-scale WiFi coverage.

[0009] To achieve the above and other related objectives, the present invention provides the following technical solution:

[0010] A centralized control and processing system for WiFi signals based on all-optical access includes several AP devices with simplified components and functions, an all-optical wireless controller connected to the AP devices via optical cables, a core switch connected to the all-optical wireless controller, an integrated service gateway connected to the core switch, and a management platform.

[0011] The AP device includes a WiFi main control unit and a first optical module. The WiFi main control unit is connected to the first optical module via a PCIe interface. The all-optical wireless controller includes a central processing unit and several second optical modules. The central processing unit is connected to the several second optical modules via a PCIe interface. The central processing unit is used to split and process the data signals from the AP device, and then convert them into IP packets for output through the network port. The central processing unit is also used to process and split the IP packets from the network port, and then transmit them to the AP side through the second optical modules to be converted into wireless WiFi signals and sent to the user terminal.

[0012] In one embodiment of the present invention, the PCIE interface uses differential signals as its core and adopts a point-to-point full-duplex architecture. The basic transmission unit of PCIE is the Lane channel. Each Lane channel contains two pairs of differential lines, thereby realizing independent transmission and reception. Multiple Lane channels can be bundled into x1 / x2 / x4 / x8 / x16 links to expand bandwidth.

[0013] In one embodiment of the present invention, the central processing unit is used to decompose and process the data signals from the AP device, and then convert them into IP packets for output through the network port. This includes: the PCIe root complex of the central processing unit receiving the data signals sent by the AP device, and analyzing and processing the data signals in the physical layer, link layer and transaction layer, and also performing core scheduling in the driver layer, and then performing kernel protocol stack processing in the network layer, transport layer and application layer.

[0014] In one embodiment of the present invention, the PCIe root complex of the central processing unit receives data signals sent by the AP device and analyzes and processes the data signals in the physical layer, link layer and transaction layer, including: the processing in the physical layer is as follows: after the PCIe root complex receives the high-speed serial bit stream sent by the WiFi master control unit through the PCIe link, it completes clock synchronization, signal line decoding, strips frame headers / tails and ECRC, and restores the original data stream;

[0015] The processing in the link layer is as follows: verifying LCRC to ensure that there are no link-level errors in the data, and managing retransmission through flow control, and sending the valid transaction layer data packet to the transaction layer; the processing in the transaction layer is as follows: parsing the type and address of the valid transaction layer data packet, and writing the data into the DMA buffer specified by the central processing unit, or triggering an interrupt to notify the central processing unit to process.

[0016] In one embodiment of the present invention, the specific process of core scheduling within the driver layer is as follows: After receiving an interrupt notification sent by the WiFi master control unit via PCIe MSI / MSI-X after completing data upload, the central processing unit suspends the current task and calls the interrupt service routine of the network card driver; DMA and buffer management: The driver completes zero-copy data transfer from the WiFi master control unit to the system memory through the DMA engine, avoiding the central processing unit from moving data byte by byte; At the same time, it maintains the receive queue, performs preliminary classification of the received 802.11 frames (management frames / data frames / control frames), and marks QoS priority.

[0017] In one embodiment of the present invention, the specific process of kernel protocol stack processing at the network layer, transport layer and application layer is as follows: the kernel network subsystem obtains data frames from the driver buffer, verifies the validity of the frame header, and determines whether it is local reception or forwarding.

[0018] In one embodiment of the present invention, the central processing unit is further configured to perform protocol processing and segmentation on IP packets from the network port, and then transmit them to the AP side through the second optical module to be converted into wireless WiFi signals and sent to the user terminal. This includes: the central processing unit receiving the digital bit stream sent from the network port, performing protocol stack processing on the digital bit stream, and then transmitting the data processed by the protocol stack to the AP side through the PCIE interface.

[0019] In one embodiment of the present invention, the central processing unit receives the digital bit stream sent from the network port, performs protocol stack processing on the digital bit stream, and then transmits the data processed by the protocol stack to the AP side through the PCIe interface. This includes: the central processing unit's soft interrupt context sending the data into the kernel protocol stack, sequentially stripping the Ethernet frame header → IP header → TCP / UDP header, completing route lookup, port mapping, flow control, and error recovery; then the data processed by the protocol stack is passed to the user-space application, and after the application completes data reassembly or policy configuration, it initiates a Wi-Fi transmission request, thereby transmitting the data to the AP side through the PCIe interface.

[0020] As described above, the WiFi signal centralized control and processing system based on all-optical access of the present invention has the following beneficial effects: The AP device in the present invention adopts a WiFi main chip + all-optical direct access control method, eliminating the need for a main control SOC, DDR, and FLASH, thereby saving a lot of equipment cost and power consumption. All WiFi signals are transmitted to the remote all-optical wireless controller for centralized processing through the PCIe interface and optical module; The all-optical wireless controller in the present invention also adopts an all-optical access method and a high-performance CPU to process the AP data signals sent in. In this way, signal processing, signal exchange, network management, and maintenance are all handled at the central office, thereby simplifying remote equipment and management and saving labor and equipment costs;

[0021] Therefore, this invention has three main advantages: First, it supports centralized management. The all-optical wireless controller can batch distribute configurations and upgrade firmware to all thin AP devices via the CAP WAP protocol, significantly reducing maintenance costs. Second, it supports seamless roaming. When users move between different thin AP coverage areas, they do not need to re-authenticate and obtain IP addresses, ensuring network continuity. Third, it has automatic load balancing capabilities. The AC will intelligently distribute users with excessive connections to AP devices with lighter loads, ensuring network stability. However, its initial investment is relatively high, requiring additional purchase of AC equipment. Therefore, it is more suitable for medium to large-scale network scenarios such as shopping malls, campuses, hospitals, and large enterprises. Attached Figure Description

[0022] Figure 1 This is a diagram showing the application architecture of large-scale WiFi coverage, which is currently the most common.

[0023] Figure 2The diagram shows the application architecture of the WiFi signal centralized control and processing system based on all-optical access disclosed in this embodiment of the invention.

[0024] Figure 3 The diagram shown is a structural block diagram of the all-optical wireless controller in the centralized control and processing system for WiFi signals based on all-optical access disclosed in an embodiment of the present invention. Detailed Implementation

[0025] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. It should be noted that, unless otherwise specified, the following embodiments and features described herein can be combined with each other.

[0026] Please see Figure 2 and Figure 3 This invention provides a centralized control and processing system for WiFi signals based on all-optical access. It includes several simplified AP devices (access points) with reduced components and functions, an all-optical wireless controller connected to the AP devices via optical cables, a core switch connected to the all-optical wireless controller, a comprehensive service gateway connected to the core switch, and a management platform. It should be noted that the core of the all-optical wireless controller is the extreme simplification of the remote AP devices' components and functions. This involves removing key components such as the main CPU, DDR, and FLASH memory for local WiFi data signal processing, reducing costs. Data is then transmitted via optical cables to a more powerful remote CPU for processing, improving the utilization and functionality of a single CPU. In effect, it also integrates the functions of the original wireless access AC controller, which can be abbreviated as OAC. This allows all raw data to be processed in the same data center, reducing network latency and making user traffic control, security management, and roaming switching more convenient and faster.

[0027] This invention is particularly suitable for medium to large-scale WiFi coverage scenarios. Its core benefits can be seen from the dimensions of network operation and maintenance, user experience, resource utilization, and security management. The all-optical wireless controller functions similarly to a wireless controller (AC), but it intervenes directly when the WiFi terminal initially connects. It can better participate in planning and managing a large number of user resources in the network. Its core role is to act as the entry and exit point for wireless signals. Complex functions such as routing, authentication, and policy management are all completed by the controller.

[0028] The AP device includes a WiFi main control unit (WiFi main chip) and a first optical module. The WiFi main control unit is connected to the first optical module via a PCIe interface. The all-optical wireless controller includes a central processing unit (CPU) and several second optical modules. The CPU is also connected to the second optical modules via a PCIe interface. Please refer to [link to details]. Figure 3 ;

[0029] It should be noted that the remote terminal connects to the AP device via WiFi. The data from the AP device is sent to the first optical module through the PCIe interface, converted into an optical signal, and then sent to the second optical module of the all-optical wireless controller via an optical cable. The second optical module receives the optical signal, converts it into a high-speed data signal, and then sends it to the PCIe interface processing chip, restoring it to a PCIe signal output. The PCIe signal is then connected to the chip through the CPU's PCIe interface. The CPU can then perform signal splitting and protocol processing, and finally convert it into IP packets for output through the network port. Similarly, IP packets input from the network port enter the CPU, undergo protocol processing and splitting, and are also output through the PCIe interface to the optical module before being sent to the AP side to be converted into wireless WiFi signals for delivery to the user.

[0030] The PCIe interface uses differential signaling as its core and adopts a point-to-point full-duplex architecture. The basic transmission unit of PCIe is the Lane channel. Each Lane channel contains two pairs of differential lines (TX+RX) to achieve independent transmission and reception. Multiple Lane channels can be bundled into x1 / x2 / x4 / x8 / x16 links to expand bandwidth. In this embodiment, one AP device uses a single Lane to connect to the control center and can select the PCIe 4.0 operating speed. Please refer to Table 1 for details.

[0031] Table 1

[0032] ;

[0033] Specifically, the connection process between the user terminal and the AP device is as follows: The connection (access) process between the user terminal (STA) and the AP follows the IEEE 802.11 standard and is executed in six steps: "scanning → authentication → association → encryption negotiation → IP acquisition → data transmission". It covers physical layer discovery, link layer binding, security establishment, and network layer access. The following is a structured parsing and key signaling / parameter description. Please refer to Table 2 for the specific process:

[0034] Table 2

[0035]

[0036] Furthermore, the AP devices in this invention are all thin APs, which must rely on the optical wireless controller for management. All configuration, forwarding, and authentication are uniformly managed by the OAC.

[0037] The wireless signal reception and processing flow is as follows (that is, the specific process by which the CPU splits and processes the PCIe signal and finally converts it into IP packets for output via the network port): The entire process of WiFi signal processing from AP to WiFi controller: WiFi7 chip (RF → baseband → PCIe transmission) → PCIe root complex (physical layer → link layer → transaction layer) → driver (interrupt + DMA + queue management) → kernel protocol stack (IP → TCP / UDP → traffic splitting) → user layer application (local consumption / forwarding);

[0038] The software processing flow is as follows: 1. PCIe link layer reception and decapsulation: 1.1 Physical layer: The main CPU's PCIe root complex receives the high-speed serial bit stream sent by the WiFi chip through the PCIe link, completes clock synchronization, signal line decoding, strips frame headers / tails and ECRC, and restores the original data stream; 1.2 Data link layer: Checks LCRC to ensure that there are no link-level errors in the data, manages retransmission through flow control (such as credit mechanism), and sends valid TLPs (transaction layer data packets) to the transaction layer; 1.3 Transaction layer: Parses the type (such as memory write, message interrupt) and address of the TLP, writes the data to the DMA buffer specified by the CPU (pre-allocated by the driver), or triggers an interrupt to notify the CPU to process;

[0039] 2. Driver Layer Processing (Kernel Mode, Core Scheduling): After the WiFi main chip completes data transmission, it notifies the CPU via a PCIe MSI / MSI-X interrupt; the CPU suspends its current task and calls the network card driver's interrupt service routine (ISR); DMA and Buffer Management: The driver uses the DMA engine to complete zero-copy data transfer from the WiFi7 chip to system memory, avoiding the CPU from handling data byte by byte; at the same time, it maintains the receive queue (Rx Queue), performs preliminary classification of received 802.11 frames (management frames / data frames / control frames), and marks them with QoS priority;

[0040] 3. Kernel Protocol Stack Processing (Network Layer → Transport Layer → Application Layer): Network Interface Layer: The kernel network subsystem (such as netdev in Linux) obtains data frames from the driver buffer, verifies the validity of the frame header (such as FCS check), and determines whether to receive locally or forward; 4. User Layer Application Distribution (Final Consumption): 4.1 Socket Delivery: The kernel pushes the processed data stream to the user layer application through the socket interface (such as the TCP / UDP socket of AF_INET); 4.2 Local / Forwarding Decision; 4.3 Local Consumption: Data is written to the application buffer for application reading and processing; 4.4 Forwarding Scenarios (such as Routers): The CPU forwards the processed IP data packets to the Ethernet interface or another WiFi radio frequency via PCIe, completing cross-network forwarding.

[0041] II. The wireless signal transmission process is as follows (that is, after the IP packet input from the network port enters the CPU, it is processed and split according to the protocol, and then output to the optical module through the PCIe interface and sent to the AP side to be converted into a wireless WiFi signal and sent to the user): Wired physical layer reception → CPU protocol stack processing → PCIe high-speed forwarding → WiFi PCIe reception → packet protocol splitting → baseband processing → radio frequency transmission.

[0042] The above process is as follows: 1. Physical layer conversion: The RJ45 network port receives the differential voltage signal from the network cable, processes it into a digital bit stream, and sends it to the MAC layer; 2. Data link layer encapsulation and DMA direct write: The MAC layer processes the bit stream and writes it to memory using DMA; 3. Interrupt notification and soft interrupt scheduling: After DMA is completed, the interrupt prompts the CPU to process the data.

[0043] 4. CPU-side protocol stack processing and data forwarding (kernel → user space): 4.1 Protocol stack layer-by-layer unpacking: The soft interrupt context sends data to the kernel protocol stack, sequentially stripping the Ethernet frame header → IP header → TCP / UDP header, completing route lookup, port mapping, flow control, and error recovery. The data processed by the protocol stack is then passed to the user-space application. After the application completes data reassembly or policy configuration, it initiates a Wi-Fi transmission request. PCEI data is packaged and line-encoded for transmission; 4.2 High-speed transmission via PCIe interface (CPU → Wi-Fi chip);

[0044] 5. WiFi chip PCIE link layer complete data reception; 6. Wi-Fi 7 chip processing and wireless transmission (PHY→RF→antenna); 6. Wi-Fi 7 MAC layer processing: After receiving data, the chip performs protocol decomposition and data processing, encapsulating the data into 802.11 frames (including MAC header, QoS control, frame body, FCS); 7. PHY layer modulation and RF transmission: The baseband converts the digital frame into a baseband signal, which is then encoded, frequency-converted, and transmitted to the user terminal by the RF circuit antenna.

[0045] In summary, the all-optical wireless controller (OAC) of this invention handles the entire process of AP device and user connection and data transmission / reception. The OAC is a core device that centrally manages all wireless APs. Its core value lies in making multi-AP networks more stable, easier to manage, and scalable, thereby solving problems such as poor roaming, chaotic configurations, and difficult maintenance in single-AP independent networks. It is widely used in multi-AP scenarios such as enterprises, campuses, and shopping malls, and is compatible with the characteristics of WiFi 5, WiFi 6, and WiFi 7. From the above, it can be seen that this invention has the following beneficial effects:

[0046] 1. Centralized Configuration Management (Core Basic Function): 1.1 Solves the problems of low efficiency and inconsistent parameters when configuring multiple APs one by one, and realizes "one-click distribution and global synchronization"; 1.2 Unified configuration distribution: AC distributes configurations (SSID name / password, channel / power, encryption method, QoS policy) to all downstream APs in batches, without having to log in to each AP to configure it; supports configuration templates, and different templates can be applied to APs in different areas (such as office area / meeting room).

[0047] 2. Seamless Roaming Management (Core Function, Essential for Multi-AP Networking): 2.1. Solves network outages and lag issues when users move between multiple APs (e.g., walking), achieving "seamless switching," with 3 levels (adapting to different business needs); 2.2. Basic Roaming (802.11k / v / r): The AC uniformly manages the coverage area and neighbor cell relationships of all APs. Core linkage logic: 802.11k: The AC allows APs to push a list of surrounding APs to the terminal, allowing the terminal to scan in advance, reducing scanning time; 802.11v: The AC coordinates APs to send roaming suggestions, eliminating the need for the terminal to blindly switch, prioritizing APs with better signal and lower load; 802.11r: The core is fast roaming. The AC pre-synchronizes terminal authentication information (e.g., PMK cache) to all APs, eliminating the need for the terminal to re-authenticate when switching APs, with a switching latency of <50ms and uninterrupted voice / video calls;

[0048] 2.3 Advanced Roaming (Enhanced WiFi 6 / 7): Adapted to high-speed scenarios, the AC supports TWT (Target Wake Time) roaming synchronization and MLO (Multi-Link Aggregation) link switching to ensure that the speed does not degrade during roaming; 2.4 Unified Roaming Permissions: Terminals can roam within all APs under the AC's jurisdiction without having to repeatedly enter passwords, and permissions are consistent.

[0049] 3. Security Access and Control (Ensuring Wireless Security): 3.1. Solve the problems of identity forgery, unauthorized access, and data leakage in wireless access, and build end-to-end security from access to transmission; 3.2. Unified Authentication Management: The AC centrally manages the access authentication of all terminals and supports mainstream authentication methods.

[0050] 4. Intelligent RF Optimization (Enhancing Wireless Experience): 4.1. Resolves issues such as multi-AP co-channel interference, uneven load, and signal dead zones, resulting in better wireless coverage and higher speeds; 4.2. Automatic Channel Optimization: The AC monitors the channel occupancy and interference intensity of all APs in real time. When the interference on a certain channel is too high, it automatically allocates an idle channel to the AP to avoid co-channel interference (the core solution to "stuttering when neighboring APs are on the same frequency"); 4.3. Automatic Power Adjustment: The AC automatically adjusts the transmission power according to the distance between APs, reducing power for nearby APs and increasing power for distant APs, thus avoiding interference and ensuring coverage without dead zones;

[0051] 4.4 Load Balancing: The AC monitors the number of users accessing each AP and the bandwidth utilization. When an AP is overloaded, it guides new terminals to access neighboring APs with lower loads, avoiding the situation where "some APs are overloaded while others are idle". 4.5 WiFi 6 / 7 Feature Adaptation: The AC uniformly enables OFDMA, MU-MIMO, and 160MHz bandwidth for APs, coordinates resource scheduling of multiple APs, and maximizes the advantages of high speed.

[0052] 5. Bandwidth and QoS Management (Ensuring Critical Services): 5.1. Resolve bandwidth contention issues among multiple services (voice / video / office), prioritizing high-priority services; 5.2. Bandwidth limiting: Limit uplink and downlink bandwidth for single terminals and single SSIDs (e.g., limit visitor bandwidth to 10Mbps) to prevent individual terminals from consuming all bandwidth;

[0053] 6. Data Forwarding and Offloading (Flexible Adaptation to Network Scenarios): 6.1 The AC supports two forwarding modes to adapt to the network architecture needs of different enterprises; 6.2 Local Forwarding (Recommended): Terminal data is directly forwarded from the AP to the wired switch without passing through the AC; the AC only transmits control signaling. Advantages: Reduces AC bandwidth pressure, suitable for high-traffic scenarios (such as high-definition video); 6.3 Centralized Forwarding: All terminal data is first forwarded to the AC, and then forwarded to the core network by the AC; Advantages: The AC can perform unified auditing and filtering of data, suitable for scenarios with high data control requirements (such as finance and government); 7. Value-Added Functions: User Behavior Auditing: Records terminal access time and internet access behavior to meet compliance requirements.

[0054] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. All equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this invention should still be covered by the claims of this invention.

Claims

1. A centralized control and processing system for WiFi signals based on all-optical access, characterized in that: It includes several AP devices with simplified components and functions, an all-optical wireless controller connected to the AP devices via optical cables, a core switch connected to the all-optical wireless controller, an integrated service gateway connected to the core switch, and a management platform; The AP device includes a WiFi main control unit and a first optical module. The WiFi main control unit is connected to the first optical module via a PCIe interface. The all-optical wireless controller includes a central processing unit and several second optical modules. The central processing unit is connected to the several second optical modules via a PCIe interface. The central processing unit is used to split and process the data signals from the AP device, and then convert them into IP packets for output through the network port. The central processing unit is also used to process and split the IP packets from the network port, and then transmit them to the AP side through the second optical modules to be converted into wireless WiFi signals and sent to the user terminal.

2. The WiFi signal centralized control and processing system based on all-optical access according to claim 1, characterized in that: The PCIe interface uses differential signals as its core and adopts a point-to-point full-duplex architecture. The basic transmission unit of PCIe is the Lane channel. Each Lane channel contains two pairs of differential lines, thereby realizing independent transmission and reception. Multiple Lane channels can be bundled into x1 / x2 / x4 / x8 / x16 links to expand bandwidth.

3. The WiFi signal centralized control and processing system based on all-optical access according to claim 1, characterized in that: The central processing unit is used to decompose and process the data signals from the AP device, and then convert them into IP packets for output through the network port, including: The central processing unit's PCIe root complex receives data signals sent from the AP device and analyzes and processes these data signals at the physical layer, link layer, and transaction layer. It also performs core scheduling within the driver layer and kernel protocol stack processing at the network layer, transport layer, and application layer.

4. The WiFi signal centralized control and processing system based on all-optical access according to claim 3, characterized in that: The central processing unit's PCIe root complex receives data signals sent from the AP device and analyzes and processes these data signals at the physical layer, data link layer, and transaction layer, including: The processing in the physical layer is as follows: After the PCIE root complex receives the high-speed serial bit stream sent by the WiFi master control unit through the PCIE link, it completes clock synchronization, signal line decoding, strips the frame header / frame tail and ECRC, and restores the original data stream. The processing in the link layer is as follows: LCRC is checked to ensure that there are no link-level errors in the data, and retransmission is managed through flow control, and valid transaction layer data packets are sent to the transaction layer. The processing procedure in the transaction layer is as follows: parse the type and address of the valid transaction layer data packet, and write the data into the DMA buffer specified by the central processing unit, or trigger an interrupt to notify the central processing unit to process it.

5. A centralized control and processing system for WiFi signals based on all-optical access according to claim 3, characterized in that: The specific process of core scheduling within the driver layer is as follows: After receiving the interrupt notification sent by the WiFi master control unit through PCIe MSI / MSI-X after completing data upload, the central processing unit suspends the current task and calls the interrupt service routine of the network card driver. DMA and Buffer Management: The driver uses the DMA engine to complete zero-copy data transfer from the WiFi master control unit to the system memory, avoiding the central processing unit from moving data byte by byte; at the same time, it maintains the receive queue, performs preliminary classification of received 802.11 frames (management frames / data frames / control frames), and marks QoS priority.

6. The WiFi signal centralized control and processing system based on all-optical access according to claim 3, characterized in that: The specific process of kernel protocol stack processing at the network layer, transport layer and application layer is as follows: the kernel network subsystem obtains data frames from the driver buffer, verifies the validity of the frame header, and determines whether it is local reception or forwarding.

7. A centralized control and processing system for WiFi signals based on all-optical access according to claim 1, characterized in that: The central processing unit is also used to process and segment IP packets from the network port, and then transmit them to the AP side through the second optical module to be converted into wireless WiFi signals and sent to the user terminal, including: The central processing unit receives the digital bit stream sent from the network port, performs protocol stack processing on the digital bit stream, and then sends the processed data to the AP side through the PCIe interface.

8. A centralized control and processing system for WiFi signals based on all-optical access according to claim 7, characterized in that: The central processing unit receives the digital bit stream sent from the network port, performs protocol stack processing on the digital bit stream, and then transmits the processed data to the AP side through the PCIe interface, including: The CPU's soft interrupt context sends data into the kernel protocol stack, sequentially stripping the Ethernet frame header, IP header, and TCP / UDP header to complete route lookup, port mapping, flow control, and error recovery. Then, the data processed by the protocol stack is passed to the user-space application. After the application completes data reassembly or policy configuration, it initiates a Wi-Fi transmission request, which is then transmitted to the AP side via the PCIe interface.

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