Uplink Synchronization Signal Access for Low-Latency Industrial WLAN
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Solution Overview
Problem
Traditional wireless local area networks (LAN) face challenges with high latency and poor reliability due to increased complexity and the need for random access sequences, which occupy orthogonal frequency division multiplexing (OFDM) symbols and increase conflict probability, especially in industrial networks with many users.
Innovation Solution
A wireless network access method that determines system coverage radius, acquires access parameters, generates unique cyclic shifts, and configures uplink synchronization signals to optimize terminal station access, including truncating and adding cyclic prefixes to ensure efficient and reliable network access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional wireless LAN uses carrier sense multi-point access mechanism with media access request frames, then the system is easy to implement without separate physical layer design, but the access delay increases and conflict probability increases causing reduced system efficiency
Solution Approach 1:
The patent applies preliminary action by pre-configuring uplink synchronization signals with specific time domain structures, cyclic prefix lengths, and guard time intervals before access occurs. This pre-configuration enables terminals to directly use these prepared signals for access without performing random access procedures, thereby reducing access delay while maintaining implementation feasibility through standardized signal designs.
2Device complexity
If traditional wireless LAN uses media access request frames for system access, then no separate physical layer design is required, but the number of OFDM symbols occupied increases and conflict probability increases
Solution Approach 1:
The patent extracts the random access procedure and media access request frames from the traditional wireless LAN access mechanism. By removing these elements and replacing them with direct uplink synchronization signal usage, the patent eliminates the time-consuming random access process and associated conflicts, thereby improving system efficiency while the management station handles the physical layer configuration centrally.
3Quantity of substance
If the number of users in wireless LAN increases, then network coverage and user capacity improve, but the probability of conflict increases causing system efficiency to decrease
Solution Approach 1:
The patent introduces uplink synchronization signals as an intermediary mechanism between the management station and terminal stations. These signals serve as a pre-coordinated access resource that eliminates direct conflicts between multiple users. The management station acts as a mediator that configures and distributes these synchronization signals to multiple terminals, enabling them to access the network simultaneously without conflict, thus improving access reliability as user quantity increases.
Data Source
AI summary
A wireless network access method includes: determining a system coverage radius according to system configuration information issued by a management station; acquiring an access parameter set, a cyclic prefix length, and a guard time interval length according to the system configuration information and the system coverage radius; determining a time domain structure of an uplink synchronization signal according to the access parameter set, the cyclic prefix length, and the guard time interval length; acquiring a unique cyclic shift size corresponding to each terminal station according to a unique identification number of each terminal station; generating an access sequence for each terminal station according to the access parameter set and the unique cyclic shift size; and performing subcarrier mapping on the access sequence and converting the access sequence after subcarrier mapping into a sequence time domain signal.