Acknowledgement Information Encoding for LTE Power Reduction
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Solution Overview
Problem
In LTE and LTE-Advanced systems, the existing methods for acknowledging information feedback result in power waste and performance loss due to the need to transmit acknowledgement information for subframes with no actual data transmission, as user equipment consumes resources to feed back unnecessary information to the base station.
Innovation Solution
A method and apparatus for encoding and processing acknowledgement information, where acknowledgement information bits are divided into groups corresponding to physical downlink shared channel transmission and downlink control information, and encoded to optimize the assignment of acknowledgement information to only scheduled subframes, reducing unnecessary transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If user equipment transmits acknowledgement information for all downlink subframes including those with no actual data transmission, then the base station can receive complete feedback information, but power is wasted and system performance is reduced due to unnecessary transmissions
Solution Approach 1:
The patent extracts and identifies subframes that contain actual data transmission from the set of all downlink subframes. By detecting which subframes have scheduled data, the system separates necessary feedback transmissions from unnecessary ones, allowing UE to skip acknowledgement transmission for empty subframes while maintaining reliability for subframes with actual data.
Solution Approach 2:
The patent implements preliminary detection of data scheduling information before generating acknowledgement feedback. By checking in advance whether a downlink subframe contains actual data transmission through downlink control information, the system prepares the feedback transmission plan beforehand, avoiding unnecessary power consumption while ensuring complete feedback for scheduled subframes.
2Adaptability or versatility
If user equipment feeds back acknowledgement information for every downlink subframe, then the base station can maintain accurate scheduling control, but system efficiency is reduced due to increased overhead and resource consumption
Solution Approach 1:
The patent extracts only the subset of subframes that require feedback by detecting actual data scheduling. This selective approach maintains the base station's ability to control scheduled transmissions accurately while removing the overhead associated with feedback for unscheduled subframes, thereby improving system efficiency.
Solution Approach 2:
Instead of performing full feedback transmission for all subframes (excessive action), the patent applies partial action by transmitting feedback only for subframes with actual data. This reduces overhead and resource consumption while maintaining sufficient scheduling control accuracy for the scheduled transmissions.
3Reliability
If user equipment processes and transmits acknowledgement information for multiple component carriers, then comprehensive feedback coverage is achieved, but resource consumption and complexity increase
Solution Approach 1:
The patent segments the feedback processing task by component carrier and subframe. For each component carrier, the system detects which subframes contain actual data transmission, then generates feedback only for those specific subframes. This segmentation approach maintains comprehensive feedback coverage across multiple carriers while reducing overall processing complexity compared to uniform feedback for all subframes.
Solution Approach 2:
The patent applies preliminary detection of data scheduling for each component carrier before generating feedback. By checking in advance which subframes contain scheduled data on each carrier, the system prepares a streamlined feedback plan that ensures comprehensive coverage where needed while avoiding unnecessary processing for empty subframes, thus reducing overall complexity.
Data Source
AI summary
A method for encoding acknowledgement information includes: receiving a component carrier, where the component carrier includes at least one downlink subframe; generating acknowledgement information bits corresponding to the component carrier according to the received component carrier; dividing the acknowledgement information bits into two groups so that each group includes at least one acknowledgement information bit, where the at least one acknowledgement information bit corresponds to physical downlink shared channel PDSCH transmission, and/or downlink control information DCI, where the DCI is used for indicating downlink semi-persistent scheduling SPS release; and encoding the two divided groups of acknowledgement information bits to obtain two groups of codeword bits, respectively, and generating, from the two groups of codeword bits obtained by the encoding, total codeword bits to be transmitted. In addition, a method for receiving acknowledgement information, an apparatus for encoding acknowledgement information, and an apparatus for processing acknowledgement information are also included.