Slot Format Indication Transmission via SFI RNTI
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Solution Overview
Problem
Current multicarrier communication systems face challenges in efficiently managing slot format indication and downlink control information, particularly in scenarios involving carrier aggregation and dual connectivity, which can lead to increased PUCCH load on primary cells and reduced network performance.
Innovation Solution
The implementation of advanced modulation and transmission mechanisms, such as OFDM, CDMA, and hybrid TDMA/CDMA, along with dynamic modulation and coding schemes, is used to enhance radio transmission efficiency. Additionally, the system employs carrier aggregation, dual connectivity, and timing advance group configurations to optimize resource allocation and reduce PUCCH load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation and dual connectivity are implemented to enhance network capacity and coverage, then network performance is improved, but PUCCH load on primary cells increases
Solution Approach 1:
The patent segments the PUCCH transmission function by introducing SCell-specific PUCCH resources, separating the primary cell's PUCCH burden from secondary cells. This allows distributed feedback transmission across multiple cells, reducing the load on any single primary cell while maintaining comprehensive network performance monitoring.
Solution Approach 2:
The patent introduces a mediator mechanism where the network dynamically indicates whether a secondary cell should transmit PUCCH on its own SCell or relay through the primary cell. This intermediary control layer optimizes the transmission path based on current network conditions, balancing load distribution and signal quality.
2Productivity
If dynamic modulation and coding schemes are used to adapt to channel conditions, then transmission efficiency is improved, but system complexity increases
Solution Approach 1:
The patent implements dynamic modulation and coding schemes where the modulation order and coding rate are adjusted based on real-time channel conditions and HARQ feedback. This dynamic adaptation maximizes transmission efficiency by selecting optimal modulation parameters while maintaining robustness across varying radio environments.
Solution Approach 2:
The patent changes key transmission parameters including subcarrier spacing, numerology, and resource allocation based on detected channel conditions and network requirements. These parameter adjustments enable efficient adaptation to different deployment scenarios without requiring complex hardware reconfiguration.
3Ease of manufacture
If slot format indication is transmitted using existing downlink control information, then implementation simplicity is maintained, but reliability of slot format transmission deteriorates
Solution Approach 1:
The patent merges slot format indication with existing downlink control information (DCI) formats, combining multiple control functions into unified message structures. This integration maintains implementation simplicity by reusing existing parsing mechanisms while enhancing reliability through redundant indication and confirmed feedback procedures.
Solution Approach 2:
The patent implements a feedback mechanism where the UE acknowledges receipt and understanding of slot format indications through HARQ processes. This feedback loop ensures reliable transmission by allowing the network to verify that slot format information was correctly received and processed, enabling corrective action if transmission failures occur.
Data Source
AI summary
A base station transmits, to a wireless device, configuration parameters indicating: downlink resources of a downlink control channel associated with a slot format indication (SFI) radio network temporary identifier (RNTI), and a discontinuous reception (DRX) operation for the wireless device to monitor the downlink control channel. Based on the downlink resources, a monitoring occasion for the downlink control channel is determined to transmit a downlink control information associated with the SFI RNTI. Regardless of whether the DRX operation is in an active time and during the monitoring occasion, the downlink control channel is transmitted that includes the downlink control information associated with the SFI RNTI and indicating a slot format. Based on the slot format, one or more transport blocks is received from the wireless device.