Uplink Control Signal Encoding for Reliable Low-Overhead Transmission
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Solution Overview
Problem
Current uplink control signaling in wireless communication systems, particularly in IEEE802.16m, employs sub-optimal modulation and coding schemes, leading to high overhead and inefficiencies, especially for channel quality information and acknowledgments, which are crucial for reliable transmission across varying channel conditions and mobile speeds.
Innovation Solution
A method for transmitting uplink control messages involves determining their size and selecting appropriate encoding schemes, such as code division multiplexing or block code schemes, based on message size, and modulating them using specific encoding specifics with chosen modulation schemes to optimize transmission over wireless interfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sub-optimal modulation and coding schemes are used for uplink control signals, then device complexity is reduced, but reliability of transmission deteriorates
Solution Approach 1:
The patent implements dynamic selection of modulation and coding schemes based on message size. Different encoding schemes (e.g., block codes for small messages, convolutional codes for larger messages) and modulation schemes (e.g., BPSK, QPSK, 16-QAM) are adaptively chosen to match the specific requirements of each control message, optimizing both reliability and complexity trade-offs for different scenarios.
Solution Approach 2:
The patent changes key transmission parameters including coding rate, modulation order, and encoding scheme type based on the size and type of control message. This parameter adaptation allows the system to achieve higher reliability for critical small messages while maintaining efficiency for larger messages, resolving the contradiction between reliability and complexity.
2Reliability
If high overhead encoding schemes are used for all control messages, then reliability is improved, but productivity of transmission deteriorates
Solution Approach 1:
The patent applies different encoding and modulation schemes tailored to the specific characteristics of each control message type and size. Instead of using a uniform high-overhead scheme for all messages, the system selects appropriate schemes locally for each message, achieving high reliability where needed while maintaining transmission efficiency for other messages.
Solution Approach 2:
The patent applies high-reliability encoding schemes only partially - specifically for small control messages where reliability is most critical (such as ACK/NACK and CQI). For larger messages, less overhead schemes are used, avoiding excessive redundancy and maintaining overall transmission productivity while ensuring reliability for critical control information.
3Adaptability or versatility
If fixed encoding schemes are used for uplink control signals, then device complexity is reduced, but adaptability to different channel conditions deteriorates
Solution Approach 1:
The patent implements dynamic adaptation of encoding and modulation schemes based on channel conditions, message size, and message type. The system selects from multiple predefined schemes according to measured channel quality and specific transmission requirements, enabling high adaptability to varying conditions while managing complexity through structured selection criteria.
Solution Approach 2:
The system performs self-adaptation by automatically selecting appropriate encoding and modulation schemes based on its own measurements of channel conditions and message characteristics. This self-service capability enables adaptability without requiring complex external control, as the transmitting device autonomously optimizes its transmission parameters based on real-time conditions.
Data Source
AI summary
Transmission of uplink control message for a wireless system. The uplink control message may be encoded according to one of multiple possible schemes. The choice of encoding scheme may be made based on the control message size and/or based on the available transmission resources and/or based on the detection scheme used on the receiving end. A modulation scheme may also be selected based on such factors. CDM may be used for certain control messages. Block code encoding, such as Reed-Muller encoding may be used for certain control messages. Different transmission resources may be allocated for different control message uses. The encoding specifics may be selected to obtain a certain hamming distance and/or size of the encoded message or based on other factors.