Wireless Uplink Channel Access Using FFP-Based CCA Timing
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in signal transmission and reception procedures, particularly in unlicensed bands, due to regulatory requirements for channel access and varying load conditions, which affect reliability and latency.
Innovation Solution
The proposed method and apparatus optimize wireless signal transmission and reception by employing frame-based and load-based channel access techniques, such as Type 1 and Type 2 channel access procedures, to efficiently manage channel occupancy and ensure reliable communication in shared spectrum environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frame-based and load-based channel access techniques are employed in unlicensed bands, then channel occupancy management is improved and communication reliability is enhanced, but transmission latency increases due to additional access procedures
Solution Approach 1:
The patent implements dynamic channel access by switching between frame-based equipment (FBE) and load-based equipment (LBE) access modes depending on channel conditions and traffic requirements. This dynamic adaptation allows the system to optimize between reliability (using FBE with fixed frame structures) and latency (using LBE with flexible backoff mechanisms), resolving the contradiction by making the access method adaptable rather than static
Solution Approach 2:
The patent changes key parameters of channel access procedures including contention window sizes, frame structures, and backoff counters to balance reliability and latency. By adjusting these parameters based on channel occupancy conditions, the system can achieve reliable communication while minimizing access delays
2Productivity
If Type 1 and Type 2 channel access procedures are used to manage channel occupancy, then channel access efficiency is improved, but device complexity increases due to multiple access modes
Solution Approach 1:
The patent segments channel access procedures into distinct types (Type 1 with frame-based access and Type 2 with load-based access) that can be independently configured and executed. This segmentation allows the system to select appropriate access methods for different transmission scenarios, improving overall efficiency while managing complexity through modular design
Solution Approach 2:
The patent creates a universal channel access framework that encompasses multiple access types (FBE and LBE) within a single standardized procedure. This multi-functional approach allows the same basic mechanism to handle different access scenarios, improving productivity without proportionally increasing device complexity
3Adaptability or versatility
If channel access procedures are implemented in shared spectrum environments, then spectrum utilization is improved, but signal transmission reliability deteriorates due to competing users
Solution Approach 1:
The patent implements feedback mechanisms where devices monitor channel occupancy, detect competing transmissions, and adjust their access behavior accordingly. This feedback loop allows the system to adapt to shared spectrum conditions, improving utilization while maintaining reliability through collision avoidance and retry mechanisms
Data Source
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AI summary
According to an embodiment of the present disclosure, a user equipment (UE) may obtain fixed frame period (FFP)-related information, and perform clear channel assessment (CCA) for at least one FFP starting with a UE-initiated channel occupancy time (COT) for transmission of an uplink signal. The FFP-related information may include information about an FFP starting offset and information about an FFP duration or period, and the UE may identify a starting time of the FFP, based on the FFP starting offset having an orthogonal frequency division multiplexing (OFDM) symbol-level granularity.