Dynamic TDD Configuration Selection for LTE User Equipment
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Solution Overview
Problem
In LTE R11's dynamic TDD UL/DL configuration, UEs face challenges in determining subframe transmission directions, leading to potential data transmission issues when receiving conflicting configurations.
Innovation Solution
The communication processing method involves a UE reporting capability indicators for dynamic TDD support, selecting appropriate TDD configurations, and determining subframe transmission directions based on received indicators, with network-side devices coordinating to stop or reconfigure data transmission accordingly to align with the selected configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dynamic TDD UL/DL configuration is implemented to adapt to varying traffic demands, then system adaptability and resource utilization improve, but UE complexity in determining subframe transmission directions increases and data transmission errors may occur when receiving conflicting configurations
Solution Approach 1:
The patent implements dynamic TDD UL/DL configuration where the network can alter the TDD configuration per cell or per UE based on real-time traffic demands. The UE is configured with multiple TDD UL/DL configurations and dynamically switches between them based on received indicators, enabling the system to adapt to varying traffic patterns while managing complexity through structured configuration management
Solution Approach 2:
The patent introduces an intermediary indication mechanism (via PDCCH, MAC CE, or RRC signaling) that mediates between the network's configuration decisions and the UE's transmission behavior. This intermediary layer resolves the contradiction by providing clear, unambiguous switching commands that enable dynamic adaptability while preventing UE confusion and reducing determination complexity
2Adaptability or versatility
If multiple TDD UL/DL configuration indicators are provided to UEs for flexible scheduling, then scheduling flexibility improves, but the reliability of data transmission deteriorates due to potential conflicting direction determinations
Solution Approach 1:
The patent applies preliminary action by pre-configuring the UE with multiple TDD UL/DL configurations and establishing clear selection rules before actual data transmission. The network provides indication information in advance (via PDCCH, MAC CE, or RRC) specifying which configuration to use, allowing the UE to reliably determine transmission directions without conflicts during actual data transmission
Solution Approach 2:
The patent implements feedback mechanisms where the network monitors UE capability indicators and provides appropriate configuration indicators based on the UE's support for dynamic TDD. This feedback loop ensures that scheduling flexibility is provided only to capable UEs with proper configuration, maintaining transmission reliability while enabling flexible scheduling where needed
3Stability of the object's composition
If semi-static TDD configuration update procedures are used to maintain network-wide consistency, then configuration consistency improves, but the productivity of dynamic traffic adaptation deteriorates due to long update periodicity
Solution Approach 1:
The patent segments the configuration update mechanism into two layers: a semi-static layer for network-wide configuration consistency (maintained through SIB1 updates) and a dynamic layer for rapid per-UE or per-cell adaptation (achieved through PDCCH, MAC CE, or RRC indicators). This segmentation allows the system to maintain consistency where needed while enabling rapid traffic adaptation through dynamic indicators without waiting for semi-static update cycles
Data Source
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AI summary
A method and a device for communication processing are provided in the present application. The method comprises: a User Equipment (UE) reports capability indication information to a network side device in order to indicate whether the UE supports a dynamic Time Division Duplex (TDD) uplink/downlink configuration; and if the dynamic TDD uplink/downlink configuration is supported, when a TDD uplink/downlink configuration indication is received, one is selected from the indicated TDD uplink/downlink configuration and the currently used TDD uplink/downlink configuration, and a transmission direction of each sub-frame is determined according to the selected TDD uplink/downlink configuration. In the embodiment of the present application, for the UE that supports the dynamic TDD uplink/downlink configuration, when the TDD uplink/downlink configuration indication is received, one TDD uplink/downlink configuration is selected to determine the transmission direction of each sub-frame, thus the problem that the transmission direction of sub-frames can not be determined in the scenario by the prior art solution is solved.