Three-Carrier HARQ-ACK Codebook Encoding for Lower HS-DPCCH Power
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Solution Overview
Problem
Current HARQ-ACK encoding solutions for Ternary Cell (TC) technologies require excessive power consumption and increase the system's Cubic Metric (CM) value, affecting performance when applied to three carriers.
Innovation Solution
A method and apparatus for encoding feedback signals using a single code channel, mapping HARQ-ACK signals of three carriers into a codeword, reducing power overhead and improving system performance without affecting the CM value, as demonstrated by specific encoding relationships and codebook selections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If prior art encoding solutions (single-carrier or dual-carrier) are adopted for Ternary Cell technology with three carriers, then feedback information can be transmitted, but power consumption increases excessively (2 to 3 times that for single carrier) and system Cubic Metric value increases
Solution Approach 1:
The patent merges the feedback information of three carriers into a single code channel, combining multiple feedback signals (ACK/NACK/DTX) from three different carriers into one unified codeword for transmission, thereby reducing power consumption and CM value while maintaining reliable feedback transmission
Solution Approach 2:
The patent creates a universal encoding solution that handles multiple feedback scenarios (ACK, NACK, DTX) across three carriers using a single encoding framework, making the system versatile in handling different carrier combinations without requiring separate encoding schemes for each carrier
2Reliability
If prior art encoding solutions are adopted for Ternary Cell technology, then feedback information can be transmitted, but the system Cubic Metric (CM) value increases, affecting system performance
Solution Approach 1:
The patent combines feedback information from three carriers into a single code channel with one codeword, reducing the system CM value by consolidating what would otherwise require multiple separate code channels and increasing system complexity
3Loss of information
If three code channels are used (one per carrier) or two code channels with prior art solutions, then each carrier's feedback can be transmitted, but power consumption becomes excessive and CM value increases
Solution Approach 1:
The patent merges feedback signals from three carriers into a single code channel, transmitting all feedback information through one unified codeword rather than using three or two separate code channels, thereby reducing power overhead while preserving complete feedback signal integrity
Solution Approach 2:
The patent transitions from a multi-dimensional approach (multiple code channels) to a single-dimensional approach (one code channel), encoding feedback from three carriers into a single 10-bit codeword that conveys all necessary information through dimensional compression
Data Source
Figure 1~3
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.