Three-Carrier Feedback Codebook Encoding for Low-CM HS-DPCCH
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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 joint encoding. Instead of using three separate code channels (one per carrier), the invention combines all HARQ-ACK feedback bits from three carriers and encodes them together using one code channel, thereby reducing power consumption and CM value while maintaining reliable feedback transmission
Solution Approach 2:
The single code channel is designed to handle multiple functions simultaneously - it carries HARQ-ACK feedback for all three carriers, replacing the need for multiple dedicated code channels. This multi-functional approach allows one code channel to serve the purpose of three, reducing overall system complexity and power requirements
2Adaptability or versatility
If three code channels are used for TC mode, then each carrier can be encoded independently, but the system CM value increases affecting performance
Solution Approach 1:
The invention merges three separate encoding operations into a single joint encoding operation. By combining all feedback bits from three carriers and encoding them together in one code channel, the system CM value is reduced while still maintaining the ability to independently represent feedback for each carrier through the joint code structure
Data Source
AI summary
A method and apparatus for encoding feedback signals 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 step of 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.