Selective Frequency Hopping for Uplink Control Signals
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional communication systems face challenges in efficiently transmitting Uplink Control Information (UCI) due to the complexity and performance issues associated with the application of Space Time Block Coding (STBC) for Physical Uplink Control Channel (PUCCH) transmissions, particularly the presence of unpaired information symbols which increase transmitter and receiver complexity and diminish performance.
Innovation Solution
The method involves selectively applying Frequency Hopping (FH) for UCI transmissions based on the type of UCI and the number of UE transmitter antennas, allowing for the use of STBC while avoiding unpaired symbols and optimizing PUCCH reception performance by disabling slot-based FH for CSI transmissions when multiple antennas are used.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If slot-based Frequency Hopping is applied for UCI transmission to obtain frequency diversity, then reliability is improved, but device complexity increases and performance diminishes due to unpaired information symbols
Solution Approach 1:
The patent applies different Frequency Hopping configurations to different UCI types and antenna configurations. Specifically, slot-based FH is disabled for CSI transmissions when multiple antennas are used with STBC, while maintaining FH for other UCI types or single-antenna configurations. This localized differentiation eliminates unpaired symbols in multi-antenna CSI transmissions while preserving FH benefits where applicable.
Solution Approach 2:
The patent dynamically adjusts the Frequency Hopping behavior based on the UCI type and the number of transmitter antennas. The system selectively enables or disables slot-based FH depending on whether STBC is applied and how many antennas are used, creating an adaptive transmission scheme that optimizes performance for each specific configuration rather than applying a fixed FH pattern universally.
2Reliability
If slot-based Frequency Hopping is applied for UCI transmission, then frequency diversity is obtained, but transmission efficiency decreases due to unpaired information symbols
Solution Approach 1:
The patent selectively applies slot-based Frequency Hopping only where beneficial and necessary. For CSI transmissions using multiple antennas with STBC, slot-based FH is disabled to eliminate unpaired symbols that reduce efficiency, while frequency diversity is still achieved through STBC and antenna diversity. This localized application maintains transmission efficiency while preserving necessary diversity.
Solution Approach 2:
The patent segments the UCI transmission handling into different paths based on UCI type and antenna configuration. One path handles CSI transmissions with multiple antennas by disabling slot-based FH and using the same RB in both slots, while another path handles other UCI types or single-antenna configurations by enabling slot-based FH. This segmentation eliminates inefficiencies in specific cases without compromising overall system performance.
3Reliability
If STBC is applied for PUCCH transmissions to improve reliability, then transmission robustness is enhanced, but complexity increases due to unpaired information symbols
Solution Approach 1:
The patent applies a specialized configuration for CSI transmissions with multiple antennas where slot-based Frequency Hopping is disabled and the same Resource Block is used in both slots. This localized configuration works in conjunction with STBC to provide the necessary diversity while avoiding the creation of unpaired information symbols, thereby reducing complexity compared to applying slot-based FH universally with STBC.
Solution Approach 2:
The patent creates an asymmetric treatment for CSI transmissions with multiple antennas compared to other UCI types or single-antenna configurations. Instead of symmetrically applying slot-based FH to all transmissions, the system asymmetrically disables it for this specific case, allowing STBC to provide diversity without the complexity overhead of unpaired symbols. This asymmetric approach optimizes the STBC implementation for the specific multi-antenna CSI scenario.
Data Source
AI summary
A Method and apparatus for selectively applying, by a User Equipment (UE), Frequency Hopping (FH) for a transmission of Uplink Control Information (UCI) signals in a Physical Uplink Control CHannel (PUCCH). The UE applies FH when the UCI is of a first type and does not apply FH when the UCI is of a second type. The UE applies FH when transmission diversity is not applied to the UCI transmission and does not apply FH when transmission diversity is applied to the UCI transmission. UEs operating in a legacy mode do not apply FH to the UCI transmission while UEs operating with additional functionalities may apply FH to the UCI transmission according to the UCI type and the use of transmission diversity.