Collision Handling for Dynamic TDD CSI-RS and Uplink Data
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Solution Overview
Problem
Dynamic Time Division Duplexed (TDD) systems face inefficiencies in handling collisions between Channel State Information Reference Signals (CSI-RS) and uplink data transmissions, leading to potential interference and reduced communication effectiveness.
Innovation Solution
The method involves determining a communication configuration at the User Equipment (UE) to either delay or reconfigure the slot to prevent collisions, including suppressing one of the colliding signals, applying a backoff period, or reconfiguring the slot to allow both CSI-RS and uplink data to be transmitted successfully, while also adjusting CSI reporting configurations based on these determinations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If independent time delays are configured for CSI-RS transmission and uplink data transmission, then flexible scheduling is achieved, but collision between CSI-RS and uplink data occurs within a single slot
Solution Approach 1:
The patent applies preliminary action by having the UE determine communication configuration in advance to address pending collisions between CSI-RS and uplink data. The UE identifies potential collisions before they occur and pre-configures appropriate handling strategies (suppressing one signal, applying backoff periods, or reconfiguring slots) to prevent interference, thereby maintaining both scheduling flexibility and transmission reliability.
2Reliability
If collision handling mechanisms are implemented, then transmission reliability is improved, but system complexity increases due to additional configuration and determination steps
Solution Approach 1:
The patent implements self-service by enabling the UE to autonomously determine and handle collisions between CSI-RS and uplink data without requiring complex network-side coordination. The UE independently identifies pending collisions and selects appropriate handling mechanisms (signal suppression, backoff application, or slot reconfiguration), reducing overall system complexity while maintaining high transmission reliability.
3Object-affected harmful factors
If one of the colliding signals is suppressed, then collision interference is eliminated, but resource utilization efficiency decreases due to wasted transmission opportunities
Solution Approach 1:
The patent applies dynamics by making the collision handling approach adaptive rather than static. The UE dynamically selects among multiple strategies (suppressing CSI-RS, suppressing uplink data, applying backoff periods, or reconfiguring slots) based on the specific collision scenario and system conditions. This dynamic selection optimizes both collision interference elimination and resource utilization efficiency, avoiding unnecessary resource waste.
Solution Approach 2:
The patent implements parameter changes by modifying transmission parameters (timing offsets, backoff periods, slot configurations) to resolve collisions. Instead of simply suppressing signals and losing resources, the system adjusts parameters to reschedule transmissions, thereby eliminating collision interference while maintaining resource utilization efficiency through optimized parameter selection.
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AI summary
Methods, systems, and devices for wireless communication are described. Generally, the described techniques provide for communicating an uplink grant and a channel state information reference signal (CSI-RS) trigger. A wireless device may identify a pending collision for a slot of a carrier between a CSI-RS and uplink data. The wireless device may determine a communication configuration for the CSI-RS and the uplink data such that no collision occurs. The determined communication configuration for the CSI-RS may include delaying one of the colliding signals, transmitting only one of the colliding signals and suppressing the other, or reconfiguring the slot such that both signals can be transmitted successfully. Additionally, the UE and the base station may determine a CSI reporting configuration based on the determined communication configuration.