Trigger-Based Uplink Sounding Signal Transmission in OFDMA Systems
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Solution Overview
Problem
Current OFDMA communication systems under 3GPP LTE standards lack a mechanism for implementing a trigger-based Sounding Reference Signal (SRS), limiting system capacity and efficiency in channel sounding processes.
Innovation Solution
A method and apparatus that utilize a Downlink Control Information (DCI) message to trigger the transmission of an uplink sounding signal, allowing for individual or group-based triggering of SRS in OFDMA communication systems, enhancing channel sounding efficiency and capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If periodic SRS transmission is used in current OFDMA systems, then channel sounding can be performed regularly, but system capacity is limited and channel sounding efficiency is reduced
Solution Approach 1:
The patent transforms the static periodic SRS transmission mechanism into a dynamic trigger-based mechanism. The RAN can dynamically trigger SRS transmissions based on current channel conditions, traffic load, and scheduling decisions, allowing the system to adaptively adjust channel sounding frequency and timing, thereby improving channel sounding efficiency and system capacity
2Measurement precision
If uplink sounding signals are transmitted frequently to improve channel estimation accuracy, then channel quality assessment improves, but uplink resource consumption increases
Solution Approach 1:
The patent implements a feedback-based trigger mechanism where the RAN monitors channel conditions and dynamically decides when SRS transmissions are necessary. The RAN sends triggers to UEs based on current channel quality, traffic patterns, and scheduling needs, allowing channel estimation accuracy to be maintained only when necessary, thus reducing unnecessary uplink resource consumption
Solution Approach 2:
The patent changes the transmission parameters of SRS from fixed periodic intervals to variable trigger-based timing. The RAN can adjust the frequency, timing, and resource allocation of SRS transmissions dynamically, changing the parameter of transmission frequency from a constant to a variable that adapts to channel conditions and system load
Data Source
AI summary
An Orthogonal Frequency Division Multiplexing communication system is provided that triggers a transmission of an uplink sounding signal by use of a Downlink Control Information (DCI) message. In various embodiments of the invention, the DCI message may be used to individually trigger an uplink sounding signal by a single user equipment or may be used to trigger an uplink sounding signal by a group of users equipment.