Uplink Data Mapping to PUSCH with UE-Specific Aperiodic SRS Subframes
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Solution Overview
Problem
In wireless communication systems, efficiently transmitting sounding reference signals (SRS) and uplink data on a physical uplink shared channel (PUSCH) in the same subframe is challenging due to overlapping SC-FDMA symbols, which can degrade channel estimation performance and resource allocation reliability.
Innovation Solution
The method involves transmitting SRS and uplink data in a manner where SC-FDMA symbols allocated to SRS and PUSCH do not overlap within the SRS subframe, with the SRS subframe configured by UE-specific or cell-specific parameters, and applying rate matching to the PUSCH to ensure efficient resource allocation and reliable SRS transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If SC-FDMA symbols for SRS and PUSCH are transmitted in the same subframe, then resource utilization is improved, but transmission reliability and channel estimation performance deteriorate due to symbol overlap
Solution Approach 1:
The uplink subframe is segmented into distinct time regions: SRS symbols are transmitted in specific SC-FDMA symbols while PUSCH data is transmitted in other symbols within the same subframe. This temporal segmentation prevents symbol overlap and ensures reliable transmission of both reference signals and data simultaneously, resolving the contradiction between resource utilization and transmission reliability
Solution Approach 2:
The system dynamically adjusts the allocation of SC-FDMA symbols between SRS and PUSCH based on transmission requirements. The base station can flexibly configure which symbols are dedicated to SRS and which to PUSCH, allowing adaptive optimization of both resource utilization and transmission reliability under different channel conditions and traffic demands
2Productivity
If SRS and PUSCH are transmitted simultaneously in the same subframe, then uplink data throughput is improved, but channel estimation accuracy deteriorates due to resource conflicts
Solution Approach 1:
The uplink subframe is segmented into distinct time regions: SRS symbols are transmitted in specific SC-FDMA symbols while PUSCH data is transmitted in other symbols within the same subframe. This temporal segmentation prevents symbol overlap and ensures reliable transmission of both reference signals and data simultaneously, resolving the contradiction between resource utilization and transmission reliability
Solution Approach 2:
The separated SC-FDMA symbol allocation acts as an intermediary mechanism that enables simultaneous SRS and PUSCH transmission without interference. By designating specific symbols for SRS and other symbols for PUSCH, the system mediates between the need for accurate channel estimation (requiring dedicated SRS resources) and high data throughput (requiring abundant PUSCH resources)
Data Source
AI summary
A method for mapping uplink data to a physical uplink shared channel (PUSCH) by a user equipment (UE) in a wireless communication system, the method includes receiving a configuration for a UE-specific aperiodic sounding reference signal (SRS) subframe from a base station; and mapping the uplink data to the PUSCH in the UE-specific aperiodic SRS subframe, wherein the UE-specific aperiodic SRS subframe includes a single carrier frequency division multiple access (SC-FDMA) symbol reserved for an aperiodic SRS, wherein the aperiodic SRS is selectively transmitted in the reserved SC-FDMA symbol to the base station, and the aperiodic SRS is transmitted in the reserved SC-FDMA symbol when triggered by the base station, and wherein the uplink data is mapped to SC-FDMA symbols other than the SC-FDMA symbol reserved for the aperiodic SRS in the UE-specific aperiodic SRS subframe in a case when the aperiodic SRS is not transmitted in the reserved SC-FDMA symbol.