Indication Channel for Low Latency Wireless Resource Puncturing
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently multiplexing low latency and higher latency communications, leading to potential puncturing of higher latency services by low latency transmissions, which can result in incomplete reception of data and reduced system efficiency.
Innovation Solution
The implementation of an indication channel technique that allows base stations to reassigned resources for low latency communications, with periodic low latency resources reserved for known periodic transmissions, enabling UEs to rate-match higher latency communications and reduce the likelihood of puncturing, and transmitting an indication of reassigned resources to UEs to manage decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If reduced length TTIs are used for low latency services, then low latency communication is improved, but puncturing of longer TTI transmissions occurs resulting in data loss
Solution Approach 1:
The base station performs preliminary rate matching for longer TTI transmissions by identifying and excluding resources that will be used for reduced length TTI transmissions. This preliminary action prevents puncturing by ensuring that the longer TTI data is not mapped to resources that will be overwritten by low latency transmissions, thereby maintaining both low latency performance and transmission reliability
Solution Approach 2:
The transmission resources are segmented into different TTI length types (reduced length and longer TTI). The base station separately processes rate matching for each segment, applying appropriate rate matching parameters to each TTI type. This segmentation allows independent optimization of low latency transmissions without compromising the reliability of longer TTI transmissions
2Loss of time
If reduced length TTIs are used to support low latency services, then low latency communication is improved, but system efficiency is reduced due to resource conflicts
Solution Approach 1:
The system dynamically adapts the TTI length based on service requirements. The base station can flexibly switch between reduced length TTIs for low latency services and longer TTIs for other services, optimizing resource utilization. This dynamic approach allows the system to maintain high efficiency by matching TTI length to service needs rather than using a fixed TTI length for all transmissions
Solution Approach 2:
The base station changes the TTI length parameter according to the service type being transmitted. For low latency services, it uses reduced length TTI parameters, while for other services it uses longer TTI parameters. This parameter adaptation allows the system to optimize performance for different service requirements while maintaining overall system efficiency through efficient resource allocation
Data Source
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AI summary
Methods, systems, and devices for wireless communication are described that provide for establishing periodic resources that may be used for low latency communications. An indication channel may be provided that may indicate that one or more higher latency transmissions may be punctured with low latency communications that are transmitted outside of the periodic resources. In some cases, the indication channel may be transmitted only in subsets of time resources, such as mini-slots of time resources within a slot, and a user equipment (UE) may monitor the indication channel to determine that a transmission is punctured. The UE may not monitor the indication channel in the periodic resources, and may thus conserve power compared to monitoring the indication channel in all time resources.