PDSCH Puncturing Detection for Mixed Transmission Time Intervals
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Solution Overview
Problem
Current wireless communication systems face challenges in minimizing interference and optimizing resource utilization due to the puncturing of Physical Downlink Shared Channels (PDSCH) with shortened Transmission Time Intervals (TTIs) in LTE-A and 5G networks, leading to increased latency and reduced network capacity.
Innovation Solution
Implementing Network-Assisted Interference Cancellation and Suppression (NAICS) receivers with higher-layer signaling assistance in User Equipment (UE) to detect and mitigate interference from PDSCH puncturing, allowing for efficient interference cancellation and resource allocation optimization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If PDSCH with shortened TTI is used to reduce latency, then transmission speed is improved, but interference from puncturing increases
Solution Approach 1:
The patent converts the harmful interference from punctured PDSCH signals into useful information by detecting and identifying the puncturing patterns. The UE uses the known structure of shortened TTI PDSCH to recognize which resources are punctured, then excludes these from decoding the normal TTI PDSCH, transforming the interference problem into a detectable and manageable condition that improves overall system performance
Solution Approach 2:
The patent introduces an intermediary detection mechanism that identifies the presence and location of punctured signals before they interfere with normal PDSCH decoding. This intermediary step allows the system to separate the harmful interference from the useful signal, enabling the UE to selectively process only the non-punctured resources
2Productivity
If PDSCH puncturing is implemented to support multiple TTIs, then resource utilization is improved, but performance loss increases
Solution Approach 1:
The patent applies preliminary action by configuring the UE in advance with knowledge of potential puncturing patterns and parameters. The network provides higher-layer signaling assistance that prepares the UE to recognize and handle punctured resources, allowing the UE to proactively adjust its decoding process before encountering interference, thereby maintaining performance while enabling flexible resource utilization
Solution Approach 2:
The patent changes parameters by allowing dynamic adjustment of TTI lengths and puncturing patterns based on traffic conditions. The system can switch between normal and shortened TTIs, and adjust the degree of puncturing, to optimize resource utilization while maintaining acceptable performance levels through adaptive parameter modification
3Measurement precision
If higher-layer signaling assistance is used to detect puncturing, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The patent achieves universality by designing a detection mechanism that handles multiple types of puncturing patterns and TTI configurations through a single unified approach. The higher-layer signaling provides general parameters that enable the UE to detect various puncturing scenarios without requiring separate detection logic for each case, reducing overall complexity while maintaining high detection accuracy
Data Source
AI summary
Techniques for detecting puncturing of a first PDSCH (physical downlink shared channel) associated with a UE (user equipment) by a second PDSCH with a shorter TTI (transmission time interval) are discussed. A base station (e.g., Evolved NodeB or eNB) can configure the UE for potential puncturing and/or parameter(s) of the second PDSCH. The UE can detect puncturing of the first PDSCH based on the configuration, and can discard punctured symbols to mitigate interference from the second PDSCH.