SRS Antenna Switching to Prevent Adjacent PUSCH Uplink Errors
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The switching of antenna ports for SRS and PUSCH transmissions in wireless communication systems can cause errors due to insufficient time for transient effects to settle, leading to performance issues in uplink communication.
Innovation Solution
A user equipment (UE) monitors PUSCH error rates and RSRP measurements to determine if SRS channels are suitable for transmission, adjusting antenna switching based on channel performance and importance of uplink or downlink traffic to minimize errors without adding gap symbols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If antenna ports are switched between SRS and PUSCH transmissions, then different antenna resources can be utilized for different transmission types, but transmission errors occur due to insufficient time for transient effects to settle
Solution Approach 1:
The system determines in advance whether SRS and PUSCH transmissions are adjacent in time and pre-configures the antenna port selection accordingly. When adjacency is detected, the PUSCH is configured to use the same antenna port as the SRS, preventing antenna switching and eliminating transient effects before transmission occurs.
Solution Approach 2:
The patent introduces an intermediary detection mechanism that identifies when SRS and PUSCH transmissions are adjacent in time. This intermediary function enables the system to adaptively select antenna ports based on the detected transmission pattern, resolving the conflict between resource allocation flexibility and transmission reliability.
2Reliability
If gap symbols are added between SRS and PUSCH transmissions, then transient effects can settle and errors are reduced, but system resources are wasted
Solution Approach 1:
Instead of adding gap symbols, the system performs preliminary detection of adjacent SRS-PUSCH transmissions and pre-configures the antenna port assignment to avoid switching. This preliminary action eliminates the need for gap symbols while maintaining transmission reliability and preserving resource efficiency.
Solution Approach 2:
The patent extracts the essential function of gap symbols (allowing transient effects to settle) and replaces it with an alternative mechanism: configuring the same antenna port for both SRS and PUSCH when transmissions are adjacent. This removes the harmful element (gap symbols that waste resources) while achieving the same reliability goal.
3Reliability
If the same antenna port is used for both SRS and PUSCH, then transient effects are avoided and errors are reduced, but channel measurement accuracy may be compromised
Solution Approach 1:
The system dynamically selects the antenna port configuration based on real-time detection of transmission adjacency. When SRS and PUSCH are adjacent, the same antenna port is used to avoid transient effects. When they are not adjacent, different antenna ports can be used to maintain channel measurement accuracy. This dynamic adaptation resolves the contradiction between reliability and measurement precision.
Solution Approach 2:
The patent changes the antenna port parameter conditionally based on the temporal relationship between SRS and PUSCH transmissions. By modifying this parameter dynamically, the system achieves high transmission accuracy when needed while preserving channel measurement capabilities when the timing conditions allow.
Data Source
AI summary
Systems and methods for improved UL performance with SRS antenna switching are provided. A UE may adjust antenna selections and/or antenna switch timing to account for excessive transmission errors due to antenna switching between SRS and PUSCH transmissions. A UE may monitor CRC error rates, and if PUSCH resources next to SRS resources have higher CRC rates above a threshold, the UE may determine if an RSRP difference between the respective antennas is below a threshold. If the RSRP difference is below the threshold, the UE may determine that the antenna port used for SRS may also be used by PUSCH without substantially detrimentally affecting PUSCH. A UE may also determine which SRS resources occurs adjacent to a PUSCH resource most often and assign that SRS resource to a default antenna which may be used for PUSCH transmission. A UE may also adjust antenna switch timing.