UE Short Processing Time for Latency Reduction
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Solution Overview
Problem
Current wireless communication systems face limitations in flexibility and efficiency, particularly in reducing latency for improved responsiveness and supporting real-time applications, as existing communication structures do not effectively manage shortened Round Trip Time (RTT) configurations.
Innovation Solution
The implementation of systems and methods that configure a short processing time for user equipment (UE) and evolved NodeBs (eNBs) to support both normal and shortened RTT timelines, allowing for flexible fallback to normal RTT communication, enabling efficient data transmission and feedback through the use of physical downlink control channels and hybrid automatic repeat request acknowledgments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a shortened RTT configuration is implemented to reduce latency, then responsiveness and real-time application support are improved, but system complexity and compatibility management become more difficult
Solution Approach 1:
The system dynamically switches between normal RTT and shortened RTT configurations based on operational needs. The base station and UE can flexibly adjust the RTT timeline duration, transitioning from standard configurations to shortened configurations (e.g., k1=4 to k1=2) to optimize latency performance while maintaining system manageability through adaptive rather than static configuration
Solution Approach 2:
The communication system is designed to support multiple RTT configurations within the same framework. The base station can configure different UEs with different RTT timelines (normal or shortened) based on their specific requirements, allowing the system to serve both latency-sensitive real-time applications and traditional applications using a single multi-functional architecture
2Speed
If processing time is reduced to improve communication speed, then data transmission efficiency is enhanced, but processing accuracy and reliability may deteriorate
Solution Approach 1:
The system changes the time parameter configuration from standard RTT values to shortened RTT values (reducing the k1 parameter from 4 to 2 subframes). This parameter adjustment increases communication speed and reduces latency while the base station compensates by optimizing other parameters such as processing capability requirements and feedback timing to maintain reliability within the compressed timeline
3Adaptability or versatility
If flexible RTT configurations are implemented to support real-time applications, then adaptability is improved, but device complexity and implementation difficulty increase
Solution Approach 1:
The base station performs self-configuration of the shortened RTT timeline parameters. Rather than requiring complex coordination or manual configuration, the base station autonomously determines and applies the appropriate RTT configuration (including setting k1=2 and adjusting associated timing parameters) based on network conditions and service requirements, simplifying the implementation process while maintaining high adaptability
Data Source
AI summary
A user equipment (UE) is described. A higher-layer processor is configured to configure a short processing time. A physical downlink control channel (PDCCH) receiver is configured to receive, in a subframe n, a PDCCH. A physical downlink shared channel (PDSCH) receiver is configured to receive, in the subframe n, a PDSCH corresponding to the PDCCH. An uplink receiver is configured to feedback, in a subframe n+k, a hybrid automatic repeat request-acknowledgement (HARQ-ACK) corresponding to the PDSCH. In a case that the PDCCH is a PDCCH in common search space, the k is equal to k1. In a case that the PDCCH is a PDCCH in UE-specific search space, the k is equal to k2. The k2 is smaller than the k1.