Single-Symbol Control Channel Multiplexing for Uplink
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Solution Overview
Problem
In future radio communication systems, existing methods for multiplexing uplink (UL) control channel information and reference signals are not applicable to UL control channels consisting of a minimum of one symbol, necessitating a new method for effectively multiplexing these components.
Innovation Solution
A transmission apparatus that multiplexes control information and reference signals in the time domain within a single symbol, suitable for new UL control channel formats, using techniques such as frequency-division multiplexing or inserting reference signals as guard intervals, to maintain low peak-to-average power ratio (PAPR) in single-carrier communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing PUCCH formats 1 to 5 are used with dedicated reference signal symbols, then reference signals can be transmitted, but at least two symbols are required which prevents use in single-symbol control channels
Solution Approach 1:
The patent merges control information and reference signals into a single symbol by frequency-division multiplexing them on different subcarriers within the same time-frequency resource. This combining approach eliminates the need for separate dedicated reference signal symbols, enabling operation in single-symbol control channels while maintaining both control information and reference signal functionality.
Solution Approach 2:
The patent transitions from time-division multiplexing (separate symbols in time domain) to frequency-division multiplexing (different subcarriers in frequency domain). This dimensional change allows control information and reference signals to coexist within a single symbol by utilizing the frequency dimension, thereby reducing the time domain resource requirement from multiple symbols to one symbol.
2Adaptability or versatility
If control information and reference signals are multiplexed in one symbol using frequency-division multiplexing, then single-symbol control channels become possible, but peak-to-average power ratio may increase
Solution Approach 1:
The patent applies cyclic prefix extension specifically to symbols containing multiplexed control information and reference signals. By extending the cyclic prefix length for these particular symbols, the system maintains low peak-to-average power ratio characteristics while enabling frequency-division multiplexing in single-symbol control channels. This parameter change (cyclic prefix length) resolves the contradiction between single-symbol support and PAPR control.
Data Source
AI summary
The present invention is designed so that control information and reference signals that are transmitted by using control channels can be multiplexed adequately in the UL/DL in future radio communication systems. According to the present invention, A transmission apparatus transmits control information by using a control channel, and this transmission apparatus has a multiplexing section that multiplexes the control information and a reference signal in a time domain in one symbol, and a transmission section that transmits the control information and the reference signal.