Reference Signal Timing Using DCI Offset Indication
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Solution Overview
Problem
In communication systems, resource waste occurs due to the need for additional DCI to trigger SRS transmission when no data scheduling is available, leading to inefficient use of resources and potential control channel congestion.
Innovation Solution
A method where a terminal device receives first information in a first time unit to trigger reference signal transmission in a second time unit indicated by a time offset indicator n in valid uplink or downlink transmission time units, allowing for flexible selection of time units and reducing the number of bits required for indicating the offset.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If extra DCI is sent to specially trigger the SRS, then the terminal device can transmit the SRS in the required time unit, but resource overhead increases due to the additional control information
Solution Approach 1:
The patent combines the SRS trigger indication with existing DCI formats used for data scheduling. Instead of sending separate DCI solely for SRS triggering, the trigger indication is merged into DCI that already carries data scheduling information, thereby utilizing existing control channel resources efficiently without requiring additional dedicated SRS trigger DCI
Solution Approach 2:
The DCI format is designed to serve multiple functions: it can simultaneously indicate data scheduling information and trigger SRS transmission. The same DCI structure is used for both purposes, making the control channel versatile and reducing the need for separate specialized control messages
2Loss of substance
If multiple pieces of first information are transmitted in the same first time unit to trigger multiple terminal devices, then resource overhead is reduced, but control channel congestion occurs
Solution Approach 1:
The patent segments the control channel transmissions across multiple time units. Instead of transmitting all trigger indications in a single time unit, different DCI messages are distributed across multiple PDCCH monitoring occasions, thereby reducing instantaneous control channel load and avoiding congestion while maintaining overall efficiency
3Manufacturing precision
If the time offset indicator n indicates an absolute time offset from the first time unit, then the second time unit is uniquely determined, but the flexibility of selecting the first time unit is reduced
Solution Approach 1:
The patent introduces dynamic selection of the first time unit based on PDCCH monitoring occasions. The first time unit is not fixed but can be dynamically chosen from multiple possible monitoring occasions, allowing the system to adapt to different scheduling scenarios while maintaining precise determination of the second time unit through the time offset indicator
Data Source
AI summary
This application provides a reference signal transmission method and a communication apparatus. In the reference signal transmission method, first information is received in a first time unit, wherein the first information triggers the communication apparatus to transmit a reference signal (RS). The RS is transmitted in a second time unit, wherein the second time unit is indicated by a time offset indicator in valid uplink transmission time units starting from a third time unit, wherein the third time unit is a conversion of the first time unit based on a subcarrier spacing of the RS and a subcarrier spacing of the first information.