SRS Carrier Switching Rules for Half-Duplex TDD Collisions
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently performing SRS carrier switching for user equipment (UE) supporting half-duplex time division duplexing carrier aggregation (TDD CA), particularly in managing collisions between sounding reference signals (SRS) and physical channels due to the lack of clear priority rules and collision handling procedures.
Innovation Solution
A method and apparatus for identifying half-DuplexTDD-CA-SameSCS capability, applying a priority rule, and performing directional collision handling to resolve collisions between SRS and physical channels in a TDD communication system, ensuring clear SRS carrier switching without ambiguity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If SRS carrier switching is performed without clear priority rules and collision handling procedures, then the system flexibility and adaptability are improved, but the operational complexity and ambiguity increase
Solution Approach 1:
The patent introduces specific parameters including priority rules (where SRS transmission is assigned higher priority than physical channels) and collision handling procedures (directionalCollisionHandling enabled/disabled). These parameter changes transform the ambiguous collision handling process into a structured decision framework, reducing operational complexity while maintaining switching flexibility.
Solution Approach 2:
The patent implements dynamic collision handling where the system can adapt its behavior based on the directionalCollisionHandling configuration. When enabled, the system dynamically selects between SRS transmission and physical channel transmission based on priority rules; when disabled, it follows conventional handling. This dynamic approach maintains flexibility while providing clear operational guidelines.
2Adaptability or versatility
If half-duplex TDD CA is supported without clear collision handling procedures, then the system versatility is improved, but the reliability of SRS transmission deteriorates
Solution Approach 1:
The patent establishes preliminary priority rules and collision handling procedures before collisions occur. By pre-defining that SRS transmission has higher priority and specifying the directionalCollisionHandling procedure in advance, the system ensures reliable SRS transmission when collisions occur in half-duplex TDD CA scenarios, eliminating ambiguity and ensuring consistent behavior.
3Ease of operation
If priority rules and collision handling procedures are implemented, then the operational clarity is improved, but the device complexity increases
Solution Approach 1:
The patent changes the operational parameters by introducing explicit priority rules and collision handling procedures. While this adds structure, it actually simplifies operation by providing clear decision criteria (check directionalCollisionHandling, apply priority rules, execute appropriate procedure) rather than requiring complex real-time analysis, thereby improving ease of operation despite the added procedural framework.
Data Source
AI summary
A method performed by a terminal in a TDD communication system is provided. The method includes identifying that the terminal supports half-DuplexTDD-CA-SameSCS capability, identifying that directionalCollisionHandling is configured as ‘enabled’ for a set of serving cells among multiple serving cells including a first serving cell and a second serving cell, in case that the terminal is not capable of simultaneous reception and transmission on the first and second serving cells, identifying that the terminal is not configured to monitor a PDCCH for DCI format 2_0 on any of the multiple serving cells, identifying a first carrier of the first serving cell not configured for a PUCCH/PUSCH, and in case that a SRS on the first carrier and a physical channel on a second carrier of the second serving cell collide and directionalCollisionHandling is configured as ‘enabled’, applying a priority rule for the SRS transmission and then a procedure for the directional collision handling.