Joint Three-Carrier Feedback Coding to Limit HS-DPCCH Power
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Solution Overview
Problem
In Ternary Cell (TC) communication systems, existing methods for encoding feedback signals across multiple carriers require excessive power consumption and increase the system's Cubic Metric (CM) value, affecting performance.
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 maintaining system performance without affecting the CM value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If three code channels are used for encoding feedback signals of three carriers, then feedback reliability is improved, but power consumption increases and system CM value increases
Solution Approach 1:
The patent merges the feedback signaling of three carriers into a single code channel by jointly encoding ACK/NACK/DTX states across all carriers. Instead of using separate code channels for each carrier, the invention combines all feedback information into one unified codeword transmitted on a single HS-DPCCH channel, thereby reducing power consumption while maintaining feedback reliability through sophisticated joint encoding schemes.
Solution Approach 2:
The single code channel is designed to handle multiple functions simultaneously - it encodes feedback for up to three different carriers and represents multiple feedback states (ACK, NACK, DTX) for each carrier within the same codeword structure. This multi-functional approach eliminates the need for separate dedicated channels for each carrier while preserving all necessary feedback information.
2Loss of information
If three code channels are used for encoding feedback signals, then feedback information completeness is improved, but system CM value increases affecting performance
Solution Approach 1:
The invention combines feedback information from three carriers into a single unified codeword structure. The joint encoding scheme systematically represents ACK, NACK, and DTX states for each carrier within one codeword, ensuring complete feedback information is conveyed without requiring multiple separate code channels, thus reducing system CM value.
Solution Approach 2:
The patent changes the encoding parameters by using a joint encoding scheme that adapts the codeword structure based on the combination of feedback states across three carriers. Different codeword patterns are assigned to different feedback scenarios (e.g., all ACK, mixed ACK/NACK/DTX), optimizing information representation while maintaining a single code channel configuration.
3Ease of manufacture
If separate code channels are used for each carrier, then encoding simplicity is improved, but power overhead increases significantly
Solution Approach 1:
The patent merges separate carrier feedback encodings into a single joint encoding process. By combining the feedback states of three carriers into one unified codeword transmitted on a single HS-DPCCH channel, the invention significantly reduces power overhead compared to using three separate code channels, while the encoding remains systematic and manageable through defined codeword mappings.
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.