Uplink MIMO Decoding Status Signaling via PHICH Resource Mapping
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Solution Overview
Problem
Conventional wireless communication systems face ambiguity in conveying decoding statuses for multiple codewords transmitted over uplink MIMO, leading to inefficient retransmissions as the UE cannot unambiguously determine which codewords are successfully or unsuccessfully decoded, resulting in inefficiency in the wireless communication environment.
Innovation Solution
The system facilitates conveying decoding statuses for multiple codewords by using multiple PHICHs or a single PHICH with resource element mapping and indicator selection, allowing the base station to signal decoding statuses to the UE, enabling clear acknowledgment or negative acknowledgment for each codeword, thereby reducing ambiguity and improving transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a one bit indicator carried on a PHICH is used to signal decoding status, then the signaling is simple and resource-efficient, but ambiguity occurs when multiple codewords are transmitted making it impossible to clearly indicate which codewords were successfully decoded
Solution Approach 1:
The patent segments the decoding status feedback into multiple separate one-bit indicators, with each indicator corresponding to a specific codeword. This allows the base station to provide individual ACK/NAK feedback for each codeword transmitted by the UE, eliminating the ambiguity that occurs when multiple codewords are multiplexed into a single indicator. The segmentation enables precise tracking of which specific codewords were successfully decoded and which require retransmission.
Solution Approach 2:
The patent introduces a new dimension for organizing feedback information by associating each one-bit indicator with specific resource elements (REs) used by the corresponding codeword. This dimensional mapping between indicators and resource elements allows the UE to determine which codeword each indicator refers to, resolving the ambiguity without requiring complex signaling structures.
2Loss of information
If multiple PHICHs are used to convey decoding statuses for multiple codewords, then unambiguous feedback is achieved, but the signaling overhead and system complexity increase
Solution Approach 1:
The patent makes the existing PHICH structure multi-functional by enabling it to carry multiple separate one-bit indicators, each serving a different codeword. Rather than creating entirely new feedback channels, the system reuses the PHICH infrastructure to provide individualized feedback for multiple codewords, thereby achieving unambiguous status communication without proportionally increasing system complexity.
Solution Approach 2:
The patent creates multiple copies of the one-bit indicator structure, with each copy dedicated to a specific codeword. This copying approach allows the system to maintain the simplicity of the original one-bit indicator format while providing separate feedback for multiple codewords, avoiding the need to design entirely new complex feedback mechanisms.
3Productivity
If a single PHICH with resource element mapping is used to indicate decoding status, then resource efficiency is maintained, but the mechanism for linking indicators to specific codewords becomes more complex
Solution Approach 1:
The patent implements a feedback mechanism where the base station monitors which resource elements were used for transmitting each codeword and generates corresponding one-bit indicators based on successful or unsuccessful decoding of those specific REs. This feedback loop between resource element usage and indicator generation enables the UE to correctly associate each indicator with its corresponding codeword, maintaining resource efficiency while providing unambiguous feedback.
Data Source
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AI summary
Systems and methodologies are described that facilitate conveying decoding statuses in a wireless communication environment. A UE can transmit a plurality of codewords as part of an uplink multiple-input multiple-output (MIMO) transmission to a base station. The base station can receive and attempt to decode the plurality of codewords. Further, decoding statuses for the plurality of codewords can be determined. Moreover, the decoding statuses for the plurality of codewords can be signaled to the UE. For example, the decoding statuses for the plurality of codewords can be conveyed via a single PHICH. According to another example, multiple PHICHs can convey the decoding statuses. Pursuant to a further example, the decoding statuses can be conveyed at least in part via a PDCCH.