SRS and PUSCH Symbol Segmentation for Unlicensed Spectrum
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Solution Overview
Problem
Current multicarrier communication systems face challenges in efficiently managing carrier aggregation and spectrum utilization, particularly in meeting the increasing demand for high data rates and capacity, especially in scenarios where licensed and unlicensed spectrum coexistence is necessary.
Innovation Solution
The implementation of advanced radio transmission mechanisms, such as OFDM, CDMA, and hybrid transmission methods, along with adaptive modulation and coding schemes, enables efficient carrier aggregation and utilization of both licensed and unlicensed spectrums through techniques like Licensed Assisted Access (LAA) and dynamic resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation is implemented to increase data rates and capacity, then network performance and throughput are improved, but system complexity and resource management difficulty increase
Solution Approach 1:
The patent segments the uplink transmission by separating SRS and PUSCH into different time resources (different symbols within a subframe). This segmentation allows independent optimization of each signal type while avoiding mutual interference, thereby managing the complexity of carrier aggregation by organizing resources in a structured, divided manner.
Solution Approach 2:
The patent introduces time-domain dimensioning by configuring SRS and PUSCH transmissions in different symbols across multiple subframes. This dimensional approach to resource allocation enables the system to handle multiple signals simultaneously without increasing frequency or spatial complexity, resolving the contradiction between throughput enhancement and system complexity.
2Productivity
If SRS and PUSCH are transmitted in the same symbol, then resource utilization is improved, but signal quality and reception reliability deteriorate due to overlap and interference
Solution Approach 1:
The patent segments overlapping SRS and PUSCH transmissions by assigning them to different OFDM symbols within the same subframe. This temporal segmentation eliminates signal overlap and interference while maintaining high resource utilization, as both signals can still be transmitted in the same subframe but in separate time slots.
Solution Approach 2:
The patent introduces an intermediary mechanism through uplink DCI signaling that coordinates the transmission timing of SRS and PUSCH. This intermediary control ensures that the two signals are properly separated in time without manual configuration, automatically resolving the interference issue while maintaining efficient resource usage.
3Adaptability or versatility
If SRS transmission is configured in the last symbol to improve resource flexibility, then resource allocation flexibility is improved, but reception reliability deteriorates due to uplink-downlink switching time requirements
Solution Approach 1:
The patent applies local quality optimization by allowing SRS transmission in the last symbol only when specific conditions are met (such as adequate switching time availability). This localized approach maintains flexibility where possible while ensuring reliability where critical, rather than applying a blanket rule across all configurations.
Solution Approach 2:
The patent implements preliminary action by configuring the system in advance to ensure adequate uplink-downlink switching time is allocated before SRS transmission in the last symbol. This pre-planning ensures that the necessary switching time is reserved, preventing reception reliability issues before they occur.
4Adaptability or versatility
If flexible resource allocation is implemented to meet varying traffic demands, then network adaptability is improved, but interference management and signal separation difficulty increase
Solution Approach 1:
The patent implements dynamic resource allocation where SRS and PUSCH transmission configurations can be adjusted based on traffic conditions and interference levels. The system dynamically selects appropriate configurations (different symbols, different subframes) to maintain adaptability while managing interference through real-time parameter adjustments rather than static complex management.
Data Source
AI summary
A wireless device receives a sounding reference signal (SRS) request field and an ending symbol field for a physical uplink shared channel (PUSCH). The SRS request field indicates an SRS is not transmitted in a last symbol of a subframe of an unlicensed cell. The ending symbol field indicates the PUSCH is not transmitted in the last symbol for a first listen before talk procedure to be performed during the last symbol. A packet is transmitted in the subframe via the PUSCH based on the ending symbol field.