Joint HARQ-ACK Codebook Encoding for Three-Carrier Feedback
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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 encoding feedback signals for three carriers.
Innovation Solution
A method and apparatus for encoding feedback signals of three carriers using a single code channel, mapping signals into a codeword selected from a codebook with specific code distance relationships, reducing power overhead and improving system performance without affecting the CM value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If three code channels are used to encode feedback signals for three carriers, then the feedback information can be transmitted accurately, but the power consumption increases to 2-3 times that of single carrier and the system CM value increases
Solution Approach 1:
The patent merges the feedback signaling of three carriers into a single code channel by jointly encoding the feedback information. Instead of using three separate code channels (one per carrier), the invention combines all feedback signals into one unified code channel, reducing power consumption and system CM value while maintaining accurate feedback transmission.
Solution Approach 2:
The single code channel is designed to handle multiple functions simultaneously - it encodes feedback information for all three carriers in a unified manner. This multi-functional approach allows one code channel to replace what would traditionally require three separate channels, achieving both power savings and maintained reliability.
2Adaptability or versatility
If three code channels are used for feedback encoding, then each carrier can be monitored independently, but the system CM value increases affecting overall system performance
Solution Approach 1:
The patent combines the monitoring capabilities for three separate carriers into a single unified code channel. The joint encoding scheme maintains the ability to independently identify feedback status for each carrier while using only one code channel, thereby reducing system CM value and avoiding the performance degradation that would result from using three separate channels.
3Quantity of substance
If multiple code channels are used for feedback signals, then the feedback information capacity is sufficient, but the power overhead becomes excessive
Solution Approach 1:
The invention merges multiple feedback information streams into a single code channel through joint encoding. This approach maintains sufficient feedback information capacity to represent all possible combinations of feedback states across three carriers, while dramatically reducing the power overhead associated with transmitting multiple separate code channels.
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.