Dynamic TDD Subframe Feedback Timing Control
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Solution Overview
Problem
In the dynamic TDD subframe application scenario of LTE R11, inconsistent understandings between the base station and User Equipment regarding the uplink-downlink configuration can lead to erroneous transmission of response information, compromising data security due to potential misclassification of dynamic subframes as uplink or downlink subframes.
Innovation Solution
A method is introduced to determine a subframe set including dynamic subframes that can serve as either uplink or downlink subframes, with feedback response information being sorted and sent through a physical uplink channel to ensure accurate mapping and transmission, using a specific set such as {7, 6, 8, 4} for subframe serial numbers, thereby stabilizing the timing relationship for response information feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dynamic TDD subframes are used to adapt to instantaneous service types, then resource utilization is improved, but configuration consistency between base station and UE deteriorates due to potential signaling loss or false detection
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple uplink-downlink configuration options (Configuration 0-6) with predetermined timing relationships for HARQ feedback. The base station and UE both store these configurations locally, allowing them to quickly switch between different uplink-downlink configurations without requiring real-time signaling exchange for each switch, thus maintaining consistency while adapting to different service types.
Solution Approach 2:
The patent implements feedback mechanisms where the base station sends configuration indicators to the UE, and the UE confirms receipt and understanding of the configuration. This bidirectional feedback ensures that both parties maintain consistent understanding of the current uplink-downlink configuration, preventing the inconsistency problem while allowing dynamic adaptation.
2Reliability
If semi-static uplink-downlink configuration is used, then configuration consistency is maintained, but resource utilization deteriorates due to mismatch with instantaneous service requirements
Solution Approach 1:
The patent introduces dynamics by enabling the uplink-downlink configuration to change over time based on service requirements. The base station can dynamically select from multiple pre-configured configurations (0-6) and indicate the current configuration to the UE through signaling. This allows the system to adapt to instantaneous service types while maintaining consistency through the feedback mechanism, resolving the contradiction between static consistency and dynamic resource utilization.
3Adaptability or versatility
If dynamic subframe allocation is implemented, then service matching is improved, but response information transmission reliability deteriorates due to inconsistent configuration understanding
Solution Approach 1:
The patent uses configuration indicators as intermediaries to bridge the base station and UE. The base station selects a configuration from the pre-defined set (0-6) and sends the configuration indicator to the UE. This intermediary mechanism ensures that both parties refer to the same configuration when determining timing relationships for HARQ feedback, preventing inconsistent understanding while allowing dynamic service matching.
Data Source
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AI summary
Disclosed are a method, a device and a system for transmitting control information, which relate to the field of communication technologies. In order to feed back response information in an application scenario of dynamic TDD subframe, the present invention provides the following technical solution: determining a subframe set corresponding to uplink subframe n, the subframe set comprising dynamic subframes; determining feedback response information according to the subframe set; and sending, in uplink subframe n, the feedback response information to a base station through a physical uplink channel, wherein n is a subframe serial number of the uplink subframe.