Handheld Device Uplink ACK Feedback for Downlink Power Reduction
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Solution Overview
Problem
The UMTS-FDD Release 99 system experiences unnecessary power consumption and interference among downlink signals due to the inability to immediately inform the base station when a downlink data frame is successfully decoded, leading to inefficient power reallocation and increased interference.
Innovation Solution
A transmission control mechanism where the handheld device uses the TFCI fields of the uplink dedicated physical control channel (UL DPCCH) to send acknowledgement (ACK) information for downlink data frame early termination, allowing the base station to terminate the downlink data frame transmission and reallocate power effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station continues transmitting the downlink data frame for the complete minimum TTI duration, then the transmission reliability is maintained, but the power consumption increases and the interference among downlink signals increases
Solution Approach 1:
The patent implements a feedback mechanism where the user device sends ACK information back to the base station through the TFCI field of the UL DPCCH. This feedback allows the base station to know whether the downlink data frame was successfully decoded, enabling it to terminate transmission early when successful, thus reducing power consumption while maintaining reliability through selective continuation or termination of transmission.
Solution Approach 2:
The patent makes the downlink transmission duration dynamic rather than fixed to the complete minimum TTI. The base station can adjust the transmission duration based on the ACK feedback received from the user device, terminating transmission early when successful decoding is confirmed, thereby optimizing power consumption while maintaining transmission reliability when needed.
2Reliability
If the base station transmits the complete downlink data frame within the minimum TTI, then the data transmission completeness is ensured, but the power consumption increases unnecessarily
Solution Approach 1:
The feedback mechanism through ACK information in the TFCI field enables the base station to determine whether complete data transmission is necessary. When the user device successfully decodes the downlink data frame, it sends an ACK, allowing the base station to terminate transmission early and avoid unnecessary power consumption while ensuring data completeness through the reliability of the ACK confirmation.
Solution Approach 2:
The patent enables preliminary termination of transmission based on early successful decoding. Instead of always transmitting the complete minimum TTI duration, the base station can preliminarily terminate transmission when the downlink data frame is successfully decoded early, preventing unnecessary power consumption while ensuring data completeness through the ACK feedback mechanism.
3Adaptability or versatility
If the base station cannot determine early decoding status, then the transmission control flexibility is maintained, but the power reallocation efficiency decreases
Solution Approach 1:
The ACK feedback mechanism provides the base station with real-time information about decoding status, enabling flexible transmission control decisions. The base station can adaptively terminate or continue transmission based on the ACK received, improving power reallocation efficiency by releasing resources early when successful decoding is confirmed, while maintaining control flexibility through the feedback-driven decision process.
4Stability of the object's composition
If the downlink data frame transmission continues for the full minimum TTI, then the transmission stability is maintained, but the interference among downlink signals increases
Solution Approach 1:
The patent makes the transmission duration dynamic based on ACK feedback. When successful decoding is confirmed, the base station terminates transmission early, reducing the time duration during which interference can occur. This dynamic adjustment maintains transmission stability through reliable ACK confirmation while reducing harmful interference by limiting transmission duration to the minimum necessary time.
Data Source
AI summary
A handheld device, a base station and transmission control methods thereof are provided. The handheld device transmits an uplink signal to the base station with an uplink dedicated physical control channel (UL DPCCH) carrying both transport format combination indicator (TFCI) code word and acknowledgement (ACK) information. The base station terminates a downlink signal transmission to the handheld device in response to the ACK information.