Uplink and Carrier-Switched SRS Timing Conflict Resolution
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Solution Overview
Problem
In wireless communication systems, collisions can occur between uplink transmissions and carrier-switched SRS due to the UE's inability to determine whether to drop SRS or uplink transmission based on the timing of downlink data reception relative to the SRS decision time, leading to conflicts when downlink data is received after the decision time.
Innovation Solution
The UE determines whether to drop SRS or uplink transmission based on the timing between the reception of the PDCCH scheduling the uplink transmission and the SRS decision time, allowing for timely conflict resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE transmits carrier-switched SRS on a second carrier, then channel state information can be obtained for frequency-dependent scheduling, but collisions may occur with uplink transmissions scheduled on different carriers when downlink data is received after the SRS decision time
Solution Approach 1:
The UE performs preliminary action by determining whether to drop SRS or uplink transmission based on the timing between PDCCH reception and SRS decision time. The UE proactively resolves potential conflicts before they occur by comparing timestamps and making preemptive decisions about which transmission to prioritize, thereby preventing collisions without waiting for actual transmission conflicts to manifest.
2Reliability
If the UE drops SRS transmission to avoid collisions, then transmission reliability is improved, but channel state information acquisition is lost
Solution Approach 1:
The system applies dynamics by making the SRS transmission decision adaptive based on real-time timing conditions. The UE dynamically adjusts its behavior by comparing the PDCCH reception time with the SRS decision time and adjusting whether to transmit SRS or prioritize uplink data transmission. This dynamic adjustment allows the system to optimize between collision avoidance and channel state information acquisition based on actual operational conditions.
3Ease of operation
If the UE waits for downlink data reception before making SRS transmission decisions, then collision resolution is simplified, but transmission timing flexibility is reduced
Solution Approach 1:
The system performs preliminary timing analysis by comparing PDCCH reception time with SRS decision time before actual transmissions occur. This preliminary action simplifies collision resolution by establishing the timing relationship in advance, allowing the UE to make informed decisions about transmission prioritization without waiting for actual conflicts to manifest, thereby maintaining timing flexibility while simplifying the decision process.
Data Source
AI summary
Aspects are provided which improve the effectiveness of conflict resolution between a scheduled uplink transmission and a carrier-switched sounding reference signal (SRS). A UE receives a physical downlink control channel (PDCCH) from a base station. The PDCCH schedules an uplink transmission on a first carrier. The UE determines whether to drop one of the uplink transmission or transmission of a SRS on a second carrier different than the first carrier based on a timing between a reception time of the PDCCH and a scheduled time for transmitting the SRS. By factoring the timing into determination, situations may be eliminated where the UE is unaware that an uplink transmission will be scheduled at the time of the carrier-switched SRS.