ACK Detection via Adaptive Block Codes in Wireless Systems
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Solution Overview
Problem
Wireless communication systems face challenges in reliably sending and receiving acknowledgement (ACK) information due to variations in channel quality and codeword transmission, which affects data retransmission and transmission efficiency.
Innovation Solution
The system employs joint encoding of channel quality index (CQI) and ACK information using block codes, allowing the base station to detect ACK based on different hypotheses for correct and missed control information reception, with variable or fixed-size ACK information depending on the number of codewords sent, enabling efficient detection and decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station uses different block codes for different hypotheses (control information missed vs. received correctly), then the reliability of ACK detection is improved, but the device complexity increases
Solution Approach 1:
The patent applies dynamics by making the block code selection adaptive based on the number of codewords transmitted. The base station dynamically switches between a first block code (when one codeword is transmitted) and a second block code (when two codewords are transmitted). This dynamic adaptation allows the system to maintain high detection reliability across different transmission scenarios while managing complexity through rule-based selection rather than requiring multiple complex codes simultaneously.
2Productivity
If the ACK information size is made variable based on codeword count, then the information transmission efficiency is improved, but the detection and decoding complexity increases
Solution Approach 1:
The patent implements variable ACK information size dynamically based on the number of codewords transmitted. When one codeword is sent, the base station expects a first number of ACK bits; when two codewords are sent, it expects a second number of ACK bits. This dynamic sizing optimizes information transmission efficiency by avoiding unnecessary bits while maintaining compactness, and the complexity is managed through predefined mapping rules between codeword count and expected ACK size.
Solution Approach 2:
The patent changes the parameter of ACK information size based on transmission conditions. The system transitions from a fixed-size ACK approach to a variable-size approach where the ACK bit length is adjusted according to the number of codewords transmitted. This parameter change allows efficient utilization of uplink resources while the base station handles the complexity through structured detection procedures that account for the variable size based on hypothesis determination.
3Adaptability or versatility
If the system supports both one-codeword and two-codeword transmission modes, then the adaptability to channel conditions is improved, but the complexity of handling multiple scenarios increases
Solution Approach 1:
The patent applies dynamics by enabling the base station to adapt its detection parameters based on the actual number of codewords transmitted in each downlink subframe. The system dynamically adjusts the expected ACK information size and selects the appropriate block code according to whether one or two codewords were sent. This dynamic behavior allows the system to handle varying channel conditions and transmission requirements while organizing the complexity through clear conditional logic and hypothesis-based detection procedures.
Data Source
AI summary
Techniques for sending and receiving acknowledgement (ACK) information in a wireless communication system are described. A base station sends control information and data to a user equipment (UE) and receives ACK information from the UE. The base station performs detection for the ACK information based on (i) a first hypothesis for the control information being missed by the UE and (ii) a second hypothesis for the control information being received correctly by the UE. In one design, the ACK information may have a variable size, and the base station may perform detection for the ACK information based on different block codes for the first and second hypotheses. In another design, the ACK information may have a fixed size, and the base station may perform detection for the ACK information based on a single block code and obtain a fixed number of bits for the ACK information for both hypotheses.