Aperiodic SRS Slot Offset Selection for TDD Collision Avoidance
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Solution Overview
Problem
In TDD systems, the fixed slot offset for aperiodic Sounding Reference Signal (AP-SRS) transmission can lead to skipped transmissions when the slot collides with DL symbols, limiting flexibility and channel quality assessment.
Innovation Solution
Configuring a list of slot offsets for AP-SRS, allowing the UE to select a first slot offset from this list based on a reference slot, enhancing flexibility and ensuring transmission even when initial slots are unavailable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed slot offset is configured for AP-SRS transmission, then the transmission timing is determined and simple to implement, but transmission is skipped when the slot collides with DL symbols, reducing flexibility and channel quality assessment capability
Solution Approach 1:
The slot offset configuration is segmented into multiple discrete offset values (e.g., 0, 1, 2, 3 slots) rather than using a single fixed offset. This segmentation allows the UE to select from multiple predefined offset options, providing flexibility to avoid DL symbol collisions while maintaining a manageable configuration structure through RRC signaling.
Solution Approach 2:
The slot offset is made dynamic by allowing the network to configure multiple offset values and enabling the UE to select the appropriate offset based on the reference slot and DL symbol patterns. This dynamic selection mechanism enhances adaptability to varying TDD configurations while the network maintains control over the configured options.
2Reliability
If a fixed slot offset is used for AP-SRS transmission, then the implementation is simple, but transmission reliability is reduced due to skipped transmissions when slots collide with DL symbols
Solution Approach 1:
The network performs preliminary configuration by providing the UE with a set of predefined slot offset values through RRC signaling before AP-SRS transmission occurs. This preliminary action enables the UE to anticipate and avoid DL symbol collisions by selecting an appropriate offset from the configured set, thereby ensuring transmission reliability without requiring complex real-time decision-making.
Solution Approach 2:
The slot offset parameter is changed from a single fixed value to a set of configurable values. By modifying the parameter structure to include multiple possible offset values (e.g., {0, 1, 2, 3}), the system achieves higher transmission reliability while keeping the configuration mechanism within standard RRC capabilities.
3Adaptability or versatility
If multiple slot offsets are configured for AP-SRS, then transmission flexibility and reliability are improved, but the configuration complexity and processing overhead increase
Solution Approach 1:
Instead of configuring all possible slot offsets or using complex dynamic scheduling, the system uses a partial action approach by providing a limited set of predefined offset values (e.g., 4 values: 0, 1, 2, 3). This partial configuration provides sufficient flexibility for most TDD scenarios while minimizing processing overhead and configuration complexity.
Solution Approach 2:
The patent uses lightweight, simple slot offset values that require minimal processing. Each offset value is a basic integer parameter that can be quickly selected and applied without complex calculations, effectively using 'cheap' (low-complexity) parameters to solve the timing alignment problem efficiently.
Data Source
AI summary
Provided is a method for a user equipment (UE). The UE obtains, from a network device, a first configuration information. The first configuration information indicates a first resource set for an aperiodic Sounding Reference Signal (AP-SRS). The first resource set for the AP-SRS includes a first list of slot offsets. The UE decodes a second configuration information from the network device. The second configuration information indicates a reference slot and a first slot offset of the first list of slot offsets. The UE generates the AP-SRS for transmission to the network device based on the reference slot and the first slot offset.