Three-Carrier Feedback Encoding on a Single HS-DPCCH Channel
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Solution Overview
Problem
In Ternary Cell (TC) communication systems, existing methods for encoding feedback signals require excessive power consumption and increase the system's Cubic Metric (CM) value, affecting performance when trying to encode feedback from three carriers using multiple code channels.
Innovation Solution
A method and apparatus for encoding feedback signals from three carriers using a single code channel, mapping the signals into a codeword selected from a specific codebook that optimizes code distance relationships to reduce power overhead and maintain system performance without affecting the CM value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple code channels are used to encode feedback signals from three carriers, then the feedback information can be transmitted, but power consumption increases excessively (2 to 3 times that of single carrier) and system CM value increases
Solution Approach 1:
The patent merges feedback signals from three different carriers into a single code channel by mapping them to one codeword from a codebook. This consolidation eliminates the need for multiple separate code channels, thereby reducing power consumption and CM value while maintaining reliable feedback transmission.
Solution Approach 2:
A single code channel is designed to handle multiple functions by encoding feedback signals from three different carriers simultaneously. The codebook structure enables one codeword to represent various feedback combinations (ACK/NACK/DTX) across multiple carriers, achieving multi-functionality without requiring multiple dedicated channels.
2Loss of information
If multiple code channels are used to encode feedback signals, then all feedback information can be transmitted, but the system CM value increases affecting performance
Solution Approach 1:
The patent combines feedback information from three carriers into a single codeword transmitted through one code channel. This merging approach maintains complete feedback information transmission while reducing system CM value by eliminating the complexity associated with managing multiple code channels.
Solution Approach 2:
The patent changes the encoding parameters by using a specifically designed codebook with optimized code distance relationships. This parameter optimization allows efficient representation of multiple feedback states in a single codeword, reducing system complexity while preserving information completeness.
3Use of energy by moving object
If a single code channel is used to encode feedback signals from three carriers, then power consumption and CM value are reduced, but encoding complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-defining a codebook with optimized codewords and code distance relationships before actual feedback encoding. This pre-prepared structure simplifies the real-time encoding process, reducing encoding complexity while maintaining low power consumption and CM value benefits.
Solution Approach 2:
The patent optimizes encoding complexity by changing parameters through a specifically designed codebook structure with predetermined code distance relationships. This parameter optimization enables efficient mapping of feedback signals to codewords, reducing the computational burden of encoding while preserving energy efficiency.
4Reliability
If code distance relationships are optimized in the codebook, then signal error detection is improved, but codebook complexity increases
Solution Approach 1:
The patent optimizes signal error detection by changing parameters through a codebook with specifically optimized code distance relationships. The codebook is designed with predetermined optimal distance properties that improve error detection capability while maintaining manageable complexity through systematic parameter selection.
Data Source
AI summary
A method and apparatus for encoding feedback signal is provided. The method includes: encoding feedback signals of three carriers to output a bit sequence; and transmitting the bit sequence on a High Speed-Dedicated Physical Control Channel (HS-DPCCH). The encoding the feedback signals of the three carriers may specifically include: mapping the feedback signals of the three carriers into a codeword, in which the codeword can be selected from a codebook, and codewords in the codebook satisfy a particular code distance relationship. The method for jointly encoding feedback signals of three carriers in a Ternary Cell (TC) mode is provided. Feedback signals are transmitted over a single code channel. Therefore, power overhead is reduced, and system performance is improved.