PUCCH Zadoff-Chu Sequence Modulation for Wider Cell Coverage
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Solution Overview
Problem
Existing physical uplink control channels (PUCCH) in wireless communication systems, particularly in 5G networks, suffer from limited cell coverage due to low power transmission, especially in formats defined for one or two symbols, which hampers effective communication.
Innovation Solution
Employing Zadoff-Chu (ZC) sequences for modulation in the physical uplink control channel (PUCCH) to enhance cell coverage by utilizing complex sequences with properties such as constant amplitude and low cross-correlation, thereby improving signal reception performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing PUCCH formats are used with limited symbols and low power transmission, then device complexity is reduced, but cell coverage and reception performance deteriorate
Solution Approach 1:
The patent changes the fundamental parameter of modulation from conventional QAM to Zadoff-Chu sequence-based modulation. This parameter change enables constant amplitude transmission which improves power efficiency and cell coverage while maintaining acceptable device complexity through standardized sequence generation procedures
Solution Approach 2:
The patent substitutes conventional amplitude/phase modulation mechanisms with sequence-based modulation using Zadoff-Chu sequences. This substitution leverages the inherent auto-correlation properties of ZC sequences to achieve better reception performance without requiring complex signal processing at the receiver
2Reliability
If Zadoff-Chu sequence length is increased to improve auto-correlation properties, then reception performance improves, but the sequence length exceeds the number of candidate values of transmission bitstream
Solution Approach 1:
The patent segments the long Zadoff-Chu sequence into multiple shorter sequences, each corresponding to different candidate values of the transmission bitstream. This segmentation allows the system to use the auto-correlation properties of ZC sequences for improved reception performance while keeping each individual sequence length manageable and compatible with the bitstream capacity
Solution Approach 2:
The patent performs preliminary mapping between transmission bitstream candidate values and specific Zadoff-Chu sequence segments before transmission. This preliminary action enables the receiver to efficiently identify the transmitted information by correlating with pre-defined sequence segments, reducing error probability without requiring excessively long sequences
Data Source
AI summary
Embodiments of the present disclosure relate to control channel transmission in a wireless communication system thereof are provided. The method, executed by a processor in user equipment (UE) or a base station (BS), may include acquiring information bits for uplink control information; acquiring a transmission bitstream, the transmission bitstream being based on channel coding and scrambling for the information bits; generating a transmission complex sequence corresponding to the transmission bitstream, the transmission complex sequence being from among a plurality of complex sequences; and transmitting a signal of the transmission complex sequence to a base station (BS) through a physical uplink control channel (PUCCH), wherein each of the plurality of complex sequences is based on a respective Zadoff-Chu (ZC) sequence, and a respective length of the ZC sequence is larger than a number of candidate values of the transmission bitstream.