A-SRS Resource Configuration via Multi-Format Control Signaling
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Solution Overview
Problem
In LTE communication systems, the use of single-bit trigger information for dynamic aperiodic SRS transmission leads to increased overhead and processing load, potential collisions between SRS transmissions from multiple terminals, and reduced accuracy in frequency scheduling, resulting in decreased system throughput.
Innovation Solution
A communication apparatus and method that utilize multiple formats for control information, where each format is associated with different resource configuration numbers for SRS transmission, allowing flexible configuration of SRS resources while limiting the increase in the number of bits used for trigger information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If single-bit trigger information is used for A-SRS transmission control, then the control information size is minimized, but the probability of SRS collision between multiple terminals increases and resource configuration flexibility is reduced
Solution Approach 1:
The patent segments the trigger information into multiple fields: a 1-bit trigger field for A-SRS transmission request and an SRS resource configuration field for resource identification. This segmentation allows the trigger bit to remain minimal while adding resource configuration capability through the separate field, resolving the contradiction between minimal trigger overhead and reliable collision-free transmission.
Solution Approach 2:
The patent adds a new dimension to the control information by introducing SRS resource configuration fields that identify specific resources from pre-configured sets. This dimensional expansion allows the system to maintain minimal trigger overhead while providing sufficient resource differentiation to prevent collisions, effectively moving from a single-bit solution to a multi-dimensional resource identification approach.
2Adaptability or versatility
If multiple SRS resource configuration parameters are transmitted frequently, then the flexibility in SRS resource allocation is improved, but the processing load and signaling overhead increase
Solution Approach 1:
The patent implements preliminary action by pre-configuring multiple SRS resource sets through RRC signaling before A-SRS transmission. These pre-configured resources are stored in the terminal and can be quickly selected based on the SRS resource configuration field in the trigger information, avoiding the need for frequent RRC reconfiguration and reducing processing load during actual transmission.
Solution Approach 2:
The patent introduces dynamic selection of pre-configured resource sets through the SRS resource configuration field. The system maintains a static pool of pre-configured resources but enables dynamic selection among them based on current transmission needs, achieving configuration flexibility without the overhead of frequent full-resource reconfiguration.
3Stability of the object's composition
If A-SRS transmission timing is delayed to the first common SRS subframe after the fourth subframe, then the trigger response time is standardized, but the frequency scheduling accuracy deteriorates
Solution Approach 1:
The patent applies local quality by allowing different SRS resource configurations to be associated with different timing requirements. The SRS resource configuration field enables selection of resources optimized for specific timing scenarios, allowing the system to maintain standardized trigger response timing while achieving high frequency scheduling accuracy through appropriate resource selection.
Data Source
AI summary
A communication apparatus and a communication method capable of suppressing an increase of bits used for a request to send a reference signal and flexibly setting a resource used for sending a reference signal. In a base station, a transmission processing unit transmits, in one of a plurality of formats, control information containing a request to send a sounding reference signal (A-SRS), and a reception processing unit receives the transmitted A-SRS using the resource specified by the format of the transmitted control information. Then, the plurality of formats is associated with each different SRS resource by a setting unit.