Scrambling Code Initialization for Consistent EHT PPDU Synchronization
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Solution Overview
Problem
In wireless local area network (WLAN) communication systems, determining a consistent initialization state for scrambling code sequences across multiple communication apparatuses is challenging when transitioning from non-802.11be to 802.11be standards, affecting communication reliability and interference.
Innovation Solution
A method for determining the initialization state of a scrambling code sequence based on a service field of a non-EHT PPDU, allowing multiple receiving devices to synchronize their scrambling code sequences for EHT PPDUs, using a first field and optionally a second field to ensure consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple communication apparatuses use different initialization states for scrambling code sequences, then device complexity is reduced and flexibility is improved, but signal interference increases and communication reliability deteriorates
Solution Approach 1:
The patent changes the parameter of initialization state from 7 bits in non-EHT PPDUs to 11 bits in EHT PPDUs. This parameter change allows for a larger state space while maintaining compatibility with existing systems. The receiving device extracts the necessary bits from the service field and uses them to determine the 11-bit initialization state, ensuring consistent scrambling code sequences across multiple apparatuses and reducing signal interference.
2Reliability
If the initialization state bit quantity is increased from 7 bits to 11 bits, then scrambling code sequence consistency is improved, but device complexity increases
Solution Approach 1:
The patent extracts the necessary initialization state bits from the service field of the non-EHT PPDU. The receiving device takes out the required bits (first field with m bits where m≥1) and uses them to determine the 11-bit initialization state. This extraction approach avoids increasing overall device complexity while achieving the required scrambling code sequence consistency.
Solution Approach 2:
The service field in the non-EHT PPDU serves multiple functions: it carries service information and also provides the bits needed for determining the initialization state of the scrambling code sequence. This multi-functionality allows the system to achieve 11-bit initialization states without adding separate signaling overhead, thereby managing device complexity while improving reliability.
3Productivity
If a first field with m bits is used to determine an 11-bit initialization state, then information transmission efficiency is improved, but measurement precision deteriorates
Solution Approach 1:
The patent transitions from a 7-bit initialization state to an 11-bit initialization state, effectively adding dimensional capacity to the system. This dimensionality change allows the service field bits to determine a larger state space, improving information transmission efficiency while maintaining sufficient precision through the extended bit length that better captures the required scrambling sequence variations.
Data Source
AI summary
A receiving device is disclosed that receives a non-EHT PPDU that includes a service field and that is sent by a sending device, where the service field includes a first field whose bit quantity is m, and m≥1; and the receiving device determines, based on the first field, an initialization state of a scrambling code sequence corresponding to an extremely-high throughput physical layer protocol data unit EHT PPDU, where a bit quantity of the initialization state of the scrambling code sequence is greater than the bit quantity of the first field.