TDD UL/DL Re-configuration for Dynamic Traffic Adaptation
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Solution Overview
Problem
The current semi-static TDD UL/DL configuration in LTE systems is inadequate for dynamic traffic situations, leading to slow subframe utilization and inefficiencies in adapting to instantaneous traffic demands, as it relies on slow system information change procedures and cannot ensure short TDD UL/DL re-configuration intervals.
Innovation Solution
The proposed solution involves re-configuring the TDD UL/DL configuration by applying different DCI to PUSCH and PDSCH to HARQ-ACK timing relations separately from the TDD radio frame configuration, allowing for improved uplink bandwidth utilization and Hybrid ARQ functionality during the re-configuration period, by using source, intermediate, and target TDD configurations effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If semi-static TDD UL/DL configuration is used, then system stability is maintained, but adaptability to dynamic traffic situations deteriorates
Solution Approach 1:
The patent implements dynamic TDD UL/DL re-configuration by allowing the network to switch between different TDD configurations (0-6) based on real-time traffic conditions. The base station can dynamically adjust the UL/DL subframe allocation ratio by selecting appropriate TDD configurations, transforming the static configuration system into a dynamic one that adapts to changing traffic demands while maintaining system stability through controlled transition mechanisms.
Solution Approach 2:
The patent changes the TDD configuration parameters (UL/DL subframe allocation patterns) to adapt to different traffic scenarios. By modifying the TDD configuration index and corresponding subframe assignments, the system can optimize uplink bandwidth utilization and downlink throughput according to instantaneous traffic conditions, resolving the contradiction between stability and adaptability.
2Speed
If system information change procedure is used for re-configuration, then re-configuration is achieved, but re-configuration speed deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-defining multiple TDD configurations (0-6) with different UL/DL subframe allocations in advance. When traffic conditions change, the network can immediately switch to a pre-configured TDD configuration that matches the current traffic pattern, avoiding the need for slow system information re-broadcasting and achieving fast re-configuration while maintaining reliable subframe utilization.
Solution Approach 2:
The patent enables dynamic switching between pre-defined TDD configurations based on real-time traffic measurements and network conditions. This dynamic approach allows the system to rapidly adapt UL/DL subframe allocation without relying on slow system information change procedures, thereby improving re-configuration speed while maintaining reliability through controlled transition mechanisms.
3Productivity
If TDD UL/DL re-configuration is performed, then uplink bandwidth utilization is improved, but timing relation compatibility deteriorates
Solution Approach 1:
The patent segments the timing relation management by separating DCI-to-PUSCH timing relations from PDSCH-to-HARQ-ACK timing relations. Each timing relation type is independently configured and managed according to its specific requirements, allowing the system to optimize uplink bandwidth utilization while maintaining proper timing relationships without excessive complexity.
Solution Approach 2:
The patent applies local quality by configuring different timing relation parameters for different timing relation types based on their specific needs. DCI-to-PUSCH timing relations are configured to optimize uplink scheduling, while PDSCH-to-HARQ-ACK timing relations are configured to ensure reliable downlink acknowledgment, thereby improving overall system performance without uniform complexity.
Data Source
AI summary
The invention relates to methods for communicating within a communication system when re-configured from a source to a target uplink/downlink configuration. The invention is also providing mobile station for performing these methods, and computer readable media the instructions of which cause the mobile station to perform the methods described herein. Specifically, the invention suggests to perform PUSCH transmissions in response to Downlink Control Information, DCI, transmissions such that the source uplink/downlink configuration is applied to PUSCH transmissions relating to DCI transmissions received up to and including subframe N−6, a predefined uplink/downlink configuration is applied to PUSCH transmissions relating to DCI transmissions received during subframes N−5 to N−1; and the target uplink/downlink configuration is applied to PUSCH transmissions relating to DCI transmissions received from subframe N onward.