Uplink Control Signal Mapping Using Cyclic Shift Hopping
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G and New Radio (NR) systems, face challenges in efficiently supporting a large number of users and devices, varying code rates, and differently sized payloads, which affects coverage enhancements and performance.
Innovation Solution
The proposed solution involves a method for mapping schemes of uplink control signals using cyclic shifts of base sequences, allowing for efficient representation of UCI bits across multiple subcarriers, thereby supporting varying payload sizes and improving coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cyclic shift hopping sequences are used for mapping uplink control information, then the detection performance is enhanced and coverage is improved, but the correlation between sequences increases which may interfere with detection accuracy
Solution Approach 1:
The patent segments the uplink control information into multiple symbols mapped across different subcarriers, with each symbol represented by a cyclic shift of a base sequence. This segmentation allows the system to distribute the information in a way that reduces correlation between adjacent sequences while maintaining detection performance. The base sequence is divided into multiple cyclic shifts, each representing a different symbol, thereby reducing the harmful correlation effect.
Solution Approach 2:
The patent changes the parameter of cyclic shift values dynamically based on the payload size and code rate. Different cyclic shift hopping sequences are selected according to the number of UCI bits and the code rate, allowing the system to optimize the correlation properties for different transmission scenarios. This parameter adaptation enables the system to maintain low correlation while enhancing detection performance across varying conditions.
2Productivity
If the number of users and devices is increased to meet demand, then connectivity and capacity are improved, but the system complexity and resource allocation difficulty increase
Solution Approach 1:
The patent employs a universal mapping scheme that can accommodate different payload sizes and code rates using the same fundamental cyclic shift hopping structure. The base sequence and cyclic shift mechanism serve multiple functions: representing different symbols, adapting to varying payload sizes, and maintaining orthogonality across different users. This multi-functionality reduces system complexity while supporting increased capacity.
Solution Approach 2:
The patent introduces dynamic selection of cyclic shift sequences based on payload size and code rate. The system dynamically adapts the mapping scheme according to the actual transmission requirements, allowing flexible resource allocation. This dynamic approach enables the system to handle varying numbers of users and devices without increasing fundamental system complexity, as the same cyclic shift mechanism can be configured for different scenarios.
3Adaptability or versatility
If varying code rates and payload sizes are supported to meet different communication needs, then adaptability is improved, but the complexity of resource allocation and mapping increases
Solution Approach 1:
The patent uses parameter changes in the cyclic shift values to accommodate different code rates and payload sizes. The same base sequence structure is used, but the specific cyclic shift assignments are adjusted based on the number of UCI bits and the desired code rate. This allows the system to support varying communication requirements without changing the fundamental mapping mechanism, thereby maintaining low complexity while achieving high adaptability.
Solution Approach 2:
The patent segments the mapping process into discrete cyclic shift steps that can be independently configured. Each symbol is represented by a specific cyclic shift, and the sequence of shifts is determined by the payload size and code rate. This segmentation allows the system to handle different communication scenarios by simply changing the sequence of cyclic shifts rather than redesigning the mapping mechanism, reducing overall complexity.
Data Source
AI summary
Methods, systems, and devices for mapping schemes for uplink control signals in mobile communication technology are described. An exemplary method for wireless communication includes transmitting, by a wireless device over a control channel, an M-bit payload on N symbols over a plurality of subcarriers, wherein M and N are positive integers, wherein each of the N symbols is represented using a base sequence (u(n, m)) and a cyclic shift (ncs (n, m)) of the base sequence, wherein n=0, 1, . . . (N−1) is a non-negative integer that indexes a symbol in the N symbols, and wherein m=0, 1, . . . (2M−1) is a non-negative integer that indexes a combination set in 2M combination sets.