Dynamic TDD Configuration via DCI Encoding
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Solution Overview
Problem
Current LTE TDD systems have a semi-static configuration mechanism that is slow and inflexible, failing to adapt dynamically to changing traffic conditions, which can lead to interference issues and suboptimal performance.
Innovation Solution
The proposed solution involves encoding the TDD configuration into a DCI transmission, where the TDD configuration is either implicitly encoded into the error detection code or explicitly included as a parameter in the DCI, allowing for dynamic adaptation of the TDD configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If semi-static configuration mechanism is used for TDD, then system complexity is reduced and implementation is simpler, but adaptability to changing traffic conditions deteriorates
Solution Approach 1:
The patent transforms the static TDD configuration into a dynamic one by enabling the base station to change the TDD configuration dynamically based on current traffic conditions. The configuration can be updated in each radio frame rather than remaining fixed for extended periods, allowing the system to adapt to varying downlink-uplink traffic ratios in real-time.
Solution Approach 2:
The patent changes the configuration parameters of the TDD system by introducing a new parameter 'tdd-ConfigIndex' that can be dynamically adjusted. Instead of using fixed semi-static configuration, the system now allows parameter changes through DCI signaling, enabling flexible modification of uplink-downlink configuration indices based on traffic demands.
2Speed
If semi-static TDD configuration is used, then implementation simplicity is maintained, but response speed to traffic changes deteriorates
Solution Approach 1:
The patent prepares the configuration change mechanism in advance by defining the DCI format and signaling procedures before actual traffic changes occur. The base station can immediately switch to a different TDD configuration when needed, as the framework for dynamic reconfiguration is already in place and standardized.
Solution Approach 2:
The patent replaces the mechanical semi-static configuration process with an electronic/digital signaling mechanism using DCI (Downlink Control Information). This substitution enables much faster configuration changes through digital signaling rather than manual or semi-automatic reconfiguration processes.
3Adaptability or versatility
If dynamic TDD configuration is implemented, then adaptability to traffic needs is improved, but signaling complexity and overhead increase
Solution Approach 1:
The patent makes the DCI signaling mechanism universal by using it for multiple purposes: both for standard downlink scheduling and for indicating dynamic TDD configuration changes. This multi-functionality reduces the need for separate dedicated signaling messages, thereby limiting the increase in signaling overhead despite the added flexibility.
Solution Approach 2:
The patent efficiently conveys configuration information by changing parameters within existing DCI formats rather than creating entirely new signaling structures. By modifying existing parameter interpretations and using established signaling channels, the system achieves dynamic flexibility without proportionally increasing signaling complexity.
4Reliability
If TDD configuration changes frequently, then system performance and interference reduction are improved, but configuration stability and reliability deteriorate
Solution Approach 1:
The patent introduces dynamic adjustability to the TDD configuration, allowing the base station to switch between different uplink-downlink configurations based on real-time traffic conditions. This dynamic capability enables the system to optimize performance and reduce interference by adapting to changing traffic patterns while maintaining the flexibility to stabilize when needed.
Data Source
AI summary
The invention relates to a method for dynamically indicating a TDD reconfiguration to the mobile station by encoding the dynamic TDD re-configuration indication into the DCI or CRC calculated for the DCI. In one embodiment, the TDD configuration indication is implicitly encoded as an RNTI into the CRC, when scrambling the CRC for the DCI with a TDD-RNTI. In another embodiment, the TDD configuration indication is part of the DCI payload, while the CRC for the DCI is scrambled with a cell identifier, identifying the target cell for which the dynamic TDD re-configuration is to be applied. In still another embodiment, the TDD configuration indication is part of the DCI payload, where the DCI payload further includes an invalid parameter indicating to the mobile station that the DCI carries the TDD configuration indication.