Wireless Latency Announcement for Deterministic Channel Access
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication technologies struggle to efficiently manage low latency and high reliability requirements in license-exempt frequency bands, particularly due to unpredictable channel access and interference, which adversely affect applications requiring deterministic channel access and concurrent low latency demands.
Innovation Solution
Implementing a Low Latency Service Announcement (LLSA) message to dynamically adapt wireless transmissions by indicating changes in latency requirements, allowing devices to efficiently allocate resources and manage concurrent low latency applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If random backoff mechanism is used for channel access in license-exempt spectrum, then collision risk is reduced, but latency becomes unpredictable and jitter increases
Solution Approach 1:
The patent applies preliminary action by having the transmitting STA announce its intended transmission time and duration before actually transmitting. This allows the receiving STA and other contending STAs to prepare in advance for the upcoming transmission, enabling more predictable channel access timing while maintaining the benefits of contention-based operation in license-exempt spectrum.
Solution Approach 2:
The patent implements feedback mechanisms where STAs exchange information about their transmission intentions and channel conditions. This feedback loop enables dynamic adjustment of transmission parameters and allows the system to adapt to changing conditions, reducing latency variation while maintaining reliable channel access.
2Adaptability or versatility
If LBT mechanism is used for channel access, then license-exempt spectrum can be shared, but deterministic channel access cannot be provided
Solution Approach 1:
The patent applies dynamics by introducing a two-phase channel access mechanism: a contention phase where STAs dynamically decide based on LBT whether to transmit, and a scheduled phase where announced transmissions are executed at predetermined times. This dynamic approach maintains spectrum sharing versatility while providing deterministic access for announced transmissions.
Solution Approach 2:
By requiring STAs to announce their transmission intentions before executing transmissions, the system creates predictability in channel access. The announcing mechanism allows other STAs to anticipate and prepare for upcoming transmissions, providing deterministic channel access characteristics while maintaining the flexibility of LBT-based spectrum sharing.
3Loss of time
If retransmissions are avoided to meet low latency requirements, then latency is reduced, but reliability decreases
Solution Approach 1:
The patent applies preliminary action by having the receiving STA send advance notifications about its reception capabilities and expected processing requirements before the transmitting STA sends data. This allows the transmitting STA to optimize its transmission parameters in advance, improving first-attempt success rate and reducing the need for retransmissions, thus achieving both low latency and high reliability.
Solution Approach 2:
The patent implements feedback mechanisms where receiving STAs provide information about their reception status and quality expectations to transmitting STAs. This feedback enables transmitting STAs to adjust their transmission strategies to maximize first-attempt success, reducing retransmission needs while maintaining high reliability, thereby achieving low latency without sacrificing reliability.
4Reliability
If multiple low latency applications require timely transmissions, then service quality improves, but resource allocation becomes complex
Solution Approach 1:
The patent applies segmentation by dividing the channel access process into distinct phases: a resource request phase where STAs announce their needs, and a resource allocation phase where transmissions are scheduled. This segmentation simplifies resource management by separating the decision-making process from the execution process, enabling better management of multiple low latency applications.
Solution Approach 2:
The patent applies preliminary action by having STAs announce their transmission needs and intended parameters before the actual transmission occurs. This advance announcement allows the system to pre-allocate resources and schedule transmissions in a structured manner, reducing the complexity of managing multiple concurrent low latency applications while maintaining service quality.
Data Source
AI summary
A wireless communication device (10, 11) sends a first wireless transmission during communication of data subject to a latency requirement. The first wireless transmission indicates a change of a need to communicate the data and comprises information on the data to be communicated. In response to sending the first wireless transmission, the wireless communication device (10, 11) further communicates the data in a second wireless transmission.