Coordinated Access Point OFDMA Transmissions for Single User
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Solution Overview
Problem
Current wireless communication systems face challenges in achieving high data throughput and efficient bandwidth utilization, particularly in supporting demanding applications like virtual reality and wireless video transmission, as existing multiple-access technologies struggle to coordinate simultaneous transmissions from multiple access points to a single user effectively.
Innovation Solution
The implementation of coordinated access point (CAP) orthogonal frequency division multiple access (OFDMA) transmissions, where multiple access points coordinate to send simultaneous OFDMA transmissions to a single user by allocating orthogonal frequency resources, allowing for parallel data frame transmissions within a transmit opportunity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple access points transmit simultaneously to a single user using traditional multiple-access technologies, then data throughput increases, but interference and coordination complexity increase
Solution Approach 1:
The patent segments the frequency spectrum into orthogonal frequency resources, allocating different frequency subsets to different access points. This segmentation allows simultaneous transmissions without interference, resolving the contradiction between increased throughput and coordination complexity by enabling independent parallel transmissions on separated frequency channels.
Solution Approach 2:
The patent transitions from time-division or code-division multiplexing to frequency-division multiplexing, adding a frequency dimension to the transmission coordination. By operating in the frequency domain rather than time or code domains, multiple access points can transmit simultaneously to a single user without requiring complex time synchronization or code coordination.
2Reliability
If orthogonal frequency resources are allocated to multiple access points for parallel transmissions, then signal-to-noise ratio improves, but frequency resource management complexity increases
Solution Approach 1:
The patent introduces a coordinator entity that acts as an intermediary to manage frequency resource allocation among multiple access points. This coordinator assigns orthogonal frequency resources to each access point, simplifying the resource management complexity by centralizing the allocation decisions and providing a clear assignment protocol that access points follow without requiring complex peer-to-peer negotiation.
3Loss of time
If simultaneous parallel transmissions are enabled, then latency is reduced, but interference management becomes more difficult
Solution Approach 1:
The patent applies local quality by assigning specific frequency resource subsets to each access point based on their local channel conditions and traffic requirements. Each access point transmits on its allocated frequency resources with optimized parameters, allowing simultaneous transmissions while minimizing interference through localized frequency allocation rather than uniform system-wide allocation.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques that may allow multiple access points (APs) to coordinate to send simultaneous OFDMA transmissions to a single user (SU). A set of APs participating in such a coordinated effort may be referred to as a coordinated AP (CAP) set. Hence, the transmissions according to this scheme may be referred to as CAP SU OFDMA transmissions.