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A method for coexistence of multi-protocol wireless communication technologies in the same frequency band
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A wireless communication technology and multi-protocol technology, applied in the field of multi-protocol wireless communication technology coexistence in the same frequency band, can solve the problems of low channel utilization, low throughput, and inability to work with multiple protocol networks at the same time, so as to improve channel utilization, The effect of avoiding signal interference
Active Publication Date: 2022-07-22
SHANDONG UNIV +1
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Problems solved by technology
[0003] To solve this problem, there are currently unmanaged solutions, such as antenna isolation, frequency separation, retransmission mechanism, CSMA / CA (Carrier Sense Multiple Access with Collision Avoidance) and clear channel assessment Technology CCA (Clear Channel Assessment), these technologies are implemented in the PHY layer or MAC layer, which can improve communication conflicts to a certain extent, but due to the lack of equipment control such as master control or coordinator, there are low channel utilization and low throughput. small problem
[0004] Managed solutions, such as PTA (Packet Traffic Arbitration) and TSCH (Time Synchronized Channel Hopping), PTA technology can make full use of the same channel and avoid interference through time-division multiplexing. However, when multiple heterogeneous networks coexist, this method can only allow one controller to initiate a request at a time, and cannot make multiple protocol networks work at the same time, even if the two protocol networks run on different frequency bands
TSCH technology combines time-sharing and frequency hopping to make full use of channels and inter-frame gaps at the same time, but there are also shortcomings. For example, TSCH technology is only applicable to WirelessHART networks. When the number of network nodes using TSCH technology is large , the accuracy and frequency requirements for time synchronization are relatively high
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Embodiment 1
[0086] like Figure 1-8 As shown, this embodiment provides a method for coexistence of multi-protocol wireless communication technologies in the same frequency band. The BLE controller, the Wi-Fi controller and the ZigBee controller coexist, and the steps are as follows:
[0087] (1) The BLE controller, the Wi-Fi controller and the ZigBee controller communicate with the BLE node, the Wi-Fi node and the ZigBee node respectively, and the designated BLE controller doubles as the coordinator, and the coordinator predicts the inter-frame gap of the Wi-Fi controller the size of;
[0088] The BLE controller, on the one hand, completes the data communication with the BLE node in the BLE network, and on the other hand, acts as the coordinator of the system, reads the REQ request information, and sends out the GNT authorization signal through a certain strategy to avoid channel conflicts in different networks. , causing signal interference.
[0089] The ZigBee controller completes the...
Embodiment 2
[0140] like Figure 9-13 As shown, this embodiment provides a method for coexistence of multi-protocol wireless communication technologies in the same frequency band. Controller 1, controller 2, ···, controller N-1, and controller N coexist, and there is no BLE control in the controller. The BLE controller has a fixed communication cycle and adaptive frequency hopping AFH technology, which is not universal;
[0141] The difference between this embodiment and Embodiment 1 is that the working frequency of the coordinator is fixed, and it is easy to judge whether there is a frequency conflict with other controllers. Therefore, in addition to the authorization signal, the GNT signal adds an interrupt signal and an interrupt release signal;
[0142] Interrupt signal, encode the preamble, frequency, and end word on the GNT signal line, of which the preamble occupies 1 byte, which is used to synchronize the signal frame; the frequency, occupies 2 bytes, that is, the coordinator has h...
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Abstract
The present invention relates to a method for coexistence of multi-protocol wireless communication technologies in the same frequency band. (2) The REQ and GNT are connected in parallel between each network controller and the coordinator respectively by sharing PTA; (3) The important data frame information is encoded on the REQ request line and the GNT authorization line It is used by the coordinator to process the communication between other network controllers and their respective nodes. The coordinator processes the REQ request signal from each network controller according to the predicted inter-frame gap, and decides whether to allow each network to control through the GNT authorization signal. device communication. The invention realizes the coexistence of multi-protocol wireless communication technologies in the same frequency band, and effectively avoids signal interference and frequency conflicts in heterogeneous networks by fully utilizing the inter-frame gaps of other network protocols and combining high and low priority data arbitration methods.
Description
technical field [0001] The invention relates to a method for coexistence of multi-protocol wireless communication technologies in the same frequency band, and belongs to the technical field of wireless communication. Background technique [0002] Heterogeneous networks such as wireless technologies Wi-Fi, ZigBee, and BLE all work in the 2.4G frequency band. When the above devices exist in the environment at the same time, data frame conflicts will inevitably occur due to overlapping channels, resulting in communication failure. Since the transmit power of Wi-Fi is several times or even dozens of times higher than that of ZigBee and BLE, the interference of Wi-Fi to devices such as ZigBee and BLE is particularly obvious, and there are considerable frames between Wi-Fi and BLE communication frames. The gap between them can satisfy one or even multiple communications of BLE, ZigBee, etc. [0003] There are currently unmanaged solutions to this problem, such as antenna isolatio...
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