Uplink Control Signal Multiplexing in OFDM Slots
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting control signals while maintaining good peak-to-average power ratio (PAPR) and cubic metric (CM) characteristics, which are essential for reducing power consumption and increasing transmission capacity.
Innovation Solution
The method involves multiplexing different control signals within a slot comprising OFDM symbols, where one control signal is spread in the frequency domain and mapped to data OFDM symbols, and the other is mapped to reference signal (RS) OFDM symbols, allowing for simultaneous transmission of multiple control signals using allocated time/frequency resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple control signals are transmitted simultaneously using allocated time/frequency resources, then transmission capacity is increased, but PAPR/CM characteristics may deteriorate
Solution Approach 1:
The slot is divided into multiple OFDM symbols, which are further divided into data OFDM symbols and reference signal OFDM symbols. Control signals are mapped to different segments (data OFDM symbols for first control signal, reference signal OFDM symbols for second control signal), allowing simultaneous transmission while maintaining PAPR/CM characteristics through proper segmentation and mapping strategies.
2Productivity
If control signals are mapped to reference signal OFDM symbols, then transmission capacity is increased, but signal interference may increase
Solution Approach 1:
Different OFDM symbols are assigned different qualities/functions: data OFDM symbols carry the first control signal with higher reliability requirements, while reference signal OFDM symbols carry the second control signal utilizing the reference signal structure. This local differentiation allows optimal resource utilization and interference management.
Solution Approach 2:
Reference signal OFDM symbols serve as intermediaries to transmit the second control signal. The reference signal structure provides a framework that allows embedding of control information while maintaining signal characteristics that reduce interference with the first control signal transmitted on data OFDM symbols.
Data Source
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AI summary
A method of transmitting control signals in a wireless communication system includes multiplexing a first control signal with a second control signal in a slot, the slot comprising a plurality of orthogonal frequency division multiplexing (OFDM) symbols in time domain, the plurality of OFDM symbols being divided into a plurality of data OFDM symbols and a plurality of reference signal (RS) OFDM symbols, wherein the first control signal is mapped to the plurality of data OFDM symbols after the first control signal is spread by a base sequence in the frequency domain, the RS is mapped to the plurality of RS OFDM symbols, the second control signal is mapped to at least one of the plurality of RS OFDM symbols, and transmitting the first control signal and the second control signal in the slot.