Dynamic TTI Adjustment for Wireless Signal Transmission
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in signal transmission and reception operations, particularly in managing transmission time intervals (TTIs) and acknowledging data errors, which affect overall communication performance.
Innovation Solution
A method and apparatus that adjust the time interval between data transmission and retransmission based on TTI length, allowing for adaptive blind decoding and mapping strategies tailored to service types like ultra-reliable and low latency communications, enhanced mobile broadband, and massive machine type communications, within a 3GPP LTE-based system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the TTI length is increased to improve data transmission efficiency, then the throughput is improved, but the latency increases
Solution Approach 1:
The patent implements dynamic TTI length adjustment where the TTI duration is not fixed but adapts based on service requirements. The system can switch between different TTI lengths (e.g., 1ms, 0.5ms, or shorter) depending on whether the service prioritizes throughput or latency, enabling flexible optimization for different traffic types without being constrained by a single fixed TTI configuration
Solution Approach 2:
The system changes the TTI parameter dynamically to match different service characteristics. For eMBB services, longer TTI lengths are used to maximize throughput, while for URLLC services, shorter TTI lengths are employed to minimize latency. This parameter adaptation allows the same physical layer to serve multiple service types with different performance requirements
2Reliability
If the number of blind decodings is increased to improve control channel reception reliability, then the reliability is improved, but the processing complexity increases
Solution Approach 1:
The patent applies partial blind decoding by determining the actual number of blind decoding attempts needed based on the specific service type and channel conditions rather than always performing maximum blind decodings. For reliable services, more blind decoding attempts are made, while for less critical services, fewer attempts suffice, reducing unnecessary processing complexity while maintaining adequate reliability
Solution Approach 2:
The system dynamically adjusts the blind decoding parameter based on service requirements and channel quality. When channel conditions are good or service requirements are moderate, the number of blind decoding attempts is reduced. When reliability is critical or channel conditions are poor, the system increases blind decoding attempts, optimizing the balance between reliability and processing complexity adaptively
3Reliability
If the time interval between first TTI and second TTI is increased to improve acknowledgment accuracy, then the reliability is improved, but the latency increases
Solution Approach 1:
The patent implements dynamic adjustment of the time interval between the first TTI (data transmission) and second TTI (retransmission). This interval is not fixed but adapts based on service type: for URLLC services, the interval is minimized to reduce latency, while for eMBB services, a longer interval allows more accurate acknowledgment processing. The system dynamically selects the appropriate interval based on current service requirements
Solution Approach 2:
The system changes the HARQ timing parameter (time interval between initial transmission and retransmission) according to service type. For low-latency services, the parameter is set to minimize the interval, while for throughput-optimized services, the parameter allows longer intervals for more reliable acknowledgment. This parameter adaptation resolves the contradiction between acknowledgment accuracy and retransmission latency
Data Source
AI summary
The present invention relates to a wireless communication system and, particularly, to a method and an apparatus therefor, the method comprising the steps of: receiving data during a first TTI; transmitting a NACK for the data; and receiving a retransmission signal of the data during a second TTI, wherein a time interval between the first TTI and the second TTI changes according to a TTI length.