Dynamic TTI Configuration for HARQ Feedback Reliability
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Solution Overview
Problem
The short Transmission Time Interval (TTI) frame structure in LTE systems leads to a higher probability of erroneous detection during HARQ feedback information transmission, significantly impacting network performance due to increased false alarms and erroneous detection rates, particularly at low signal-to-noise ratios.
Innovation Solution
A method where the base station determines the feedback manner of HARQ feedback information by assessing the signal-to-noise ratio (SNR) of user equipment and sends appropriate signaling to indicate whether to feed back or skip HARQ feedback, thereby reducing erroneous detection by configuring modulation and coding schemes, channel state information, and TTI frame structures to optimize data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a short TTI frame structure is introduced to reduce scheduling interval and delay, then the scheduling interval is shortened from 1ms to one symbol (0.5ms), but the probability of erroneous detection during HARQ feedback information transmission increases significantly
Solution Approach 1:
The patent dynamically adjusts the TTI frame structure based on channel conditions. When channel quality is good, shorter TTI (one symbol) is used to reduce delay. When channel quality deteriorates, the system switches to longer TTI (1ms) to reduce erroneous detection probability. This dynamic adaptation resolves the contradiction between minimizing scheduling interval and maintaining detection reliability.
Solution Approach 2:
The patent changes the TTI duration parameter from fixed to variable, allowing switching between one-symbol TTI (0.5ms) and normal TTI (1ms) based on signal-to-noise ratio and channel state. This parameter change enables the system to optimize between speed (shorter TTI) and accuracy (longer TTI) depending on real-time conditions.
2Duration of action of moving object
If HARQ feedback information is transmitted in short TTI, then the round trip time is reduced, but the false alarm and erroneous detection rates increase, especially at low signal-to-noise ratios
Solution Approach 1:
The system dynamically selects between short TTI (one symbol) and normal TTI (1ms) based on real-time channel quality assessment. When SNR is high, short TTI is used to minimize round trip time. When SNR is low, normal TTI is used to ensure sufficient processing time and reduce detection errors, thus resolving the contradiction between fast response and accurate detection.
Solution Approach 2:
The base station autonomously determines the appropriate TTI length based on channel conditions without requiring explicit user equipment feedback. The system self-adjusts the TTI frame structure to balance round trip time and detection precision based on current network state.
3Speed
If the scheduling interval is shortened to meet low-delay service requirements, then the delay is reduced, but the impact on network performance due to erroneous detection increases
Solution Approach 1:
The patent implements dynamic TTI configuration where the scheduling interval adapts to channel conditions. In good channel conditions, short TTI (one symbol) maintains high transmission speed. In poor channel conditions, normal TTI (1ms) ensures reliable detection and maintains overall network productivity. This dynamic adjustment resolves the contradiction between speed and network performance.
Solution Approach 2:
The system changes the TTI parameter from static to dynamic, allowing flexible adjustment between 0.5ms and 1ms based on signal quality. This enables the network to maintain high productivity by avoiding erroneous detections that would require retransmissions, while still achieving low latency when conditions permit.
Data Source
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AI summary
Embodiments of the present invention relate to the field of communications technologies, and in particular, to an information processing method and an apparatus, so as to resolve a problem that exists in the prior art. The information processing method provided in the embodiments of the present invention includes: determining, by a base station, a feedback manner of hybrid automatic repeat request HARQ feedback information of user equipment, where the feedback manner includes: feeding back the HARQ feedback information, or skipping feeding back the HARQ feedback information; determining, by the base station, first signaling according to the feedback manner of the HARQ feedback information, where the first signaling implicitly indicates the feedback manner of the HARQ feedback information; and sending the first signaling to the user equipment, so that the user equipment determines the feedback manner of the HARQ feedback information according to the first signaling.