Uplink Carrier Aggregation Scheduling With A-SRS Symbol Muting
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Solution Overview
Problem
Current communication networks, particularly in uplink carrier aggregation scenarios, face challenges in supporting aperiodic sounding reference signals (A-SRS) due to simultaneous transmission issues with PUCCH or PUSCH, and power limitations, leading to decoding failures and inefficient throughput.
Innovation Solution
Implementing a symbol muting mechanism, synchronization mechanism, and scheduling suspension time to manage A-SRS transmissions in uplink carrier aggregation, ensuring coordinated scheduling between TDD and FDD carriers to avoid simultaneous conflicts and power imbalances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If aperiodic sounding reference signal (A-SRS) is transmitted simultaneously with PUCCH or PUSCH, then channel sounding capability is improved, but decoding failures occur due to power limitations and simultaneous transmission conflicts
Solution Approach 1:
The patent introduces a symbol muting mechanism as an intermediary control method. When A-SRS transmission is scheduled, the network device mutes specific uplink symbols in the second carrier to prevent simultaneous transmission conflicts with PUCCH or PUSCH. This intermediary control resolves the contradiction by allowing A-SRS transmission while preventing decoding failures through coordinated symbol muting.
Solution Approach 2:
The patent implements preliminary scheduling suspension time before A-SRS transmission. The network device suspends uplink scheduling in the second carrier for a predetermined time period before the A-SRS transmission occurs. This preliminary action ensures that no PUCCH or PUSCH transmissions are scheduled during the A-SRS transmission window, preventing simultaneous transmission conflicts and decoding failures.
2Productivity
If uplink carrier aggregation is implemented with multiple carriers, then throughput is improved, but simultaneous transmission conflicts and power imbalances occur between carriers
Solution Approach 1:
The patent uses symbol muting as an intermediary mechanism to coordinate transmissions across aggregated carriers. When A-SRS is transmitted in the first carrier, the network device mutes corresponding uplink symbols in the second carrier. This intermediary control prevents simultaneous transmission conflicts between carriers while maintaining the throughput benefits of carrier aggregation.
Solution Approach 2:
The patent implements preliminary scheduling suspension in the second carrier before A-SRS transmission in the first carrier. By suspending uplink scheduling in advance in the second carrier, the system prevents power imbalances and simultaneous transmission conflicts between aggregated carriers, ensuring stable throughput performance.
3Reliability
If symbol muting is applied to prevent simultaneous transmission conflicts, then decoding reliability is improved, but uplink scheduling flexibility is reduced
Solution Approach 1:
The patent implements symbol muting selectively and periodically only when A-SRS transmission is scheduled in the first carrier. The network device monitors A-SRS scheduling requests and applies muting only in those specific instances where simultaneous transmission conflicts would occur. This periodic, condition-based approach maintains decoding reliability while preserving uplink scheduling flexibility for normal operations.
Solution Approach 2:
The patent applies symbol muting locally only to specific uplink symbols in the second carrier that would conflict with A-SRS transmission in the first carrier. Rather than muting entire carriers or prolonged time periods, the solution targets only the specific symbols where conflicts occur, thereby maintaining decoding reliability while minimizing impact on overall uplink scheduling flexibility.
Data Source
AI summary
Embodiments of the present disclosure provide devices, methods, apparatus, and computer-readable media for communication. In the method, a network device monitors a change in a rank for a terminal device in a first carrier of the network device. Based on detecting a decrease in the rank, the network device transmits, to the terminal device, scheduling information for scheduling transmission of an aperiodic sounding reference signal (SRS) in the first carrier. The network device transmits, to the terminal device, first information for muting at least one predetermined symbol in an uplink slot in uplink scheduling of a second carrier of the network device, wherein the first carrier and the second carrier are used for uplink carrier aggregation for the terminal device.