Dynamic Subframe Attribute Determination in LTE TDD Systems
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Solution Overview
Problem
In LTE TDD systems, dynamic TDD subframes pose a challenge as it is unclear whether they function as uplink or downlink subframes, hindering efficient information transmission, especially in scenarios with a small number of users where configured uplink-downlink configurations do not match instantaneous service types.
Innovation Solution
A method and apparatus that determine the attribute of dynamic subframes by user equipment, using signaling from the base station to identify whether they are uplink or downlink subframes, enabling appropriate information transmission based on this determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If semi-static uplink-downlink configuration is used in LTE TDD system, then configuration stability is improved, but resource utilization efficiency deteriorates when service types vary dynamically
Solution Approach 1:
The patent introduces dynamic subframes that can flexibly switch between uplink and downlink functions based on instantaneous service requirements. This dynamic adjustment mechanism allows the system to adapt to varying traffic patterns while maintaining a stable semi-static configuration framework, thereby resolving the contradiction between configuration stability and resource utilization efficiency.
2Adaptability or versatility
If dynamic TDD subframes are introduced to improve resource utilization, then adaptability to varying service types is improved, but the complexity of determining subframe function increases
Solution Approach 1:
The patent employs preliminary configuration where the network pre-configures dynamic subframes and their potential functions. Before actual data transmission, the system prepares the subframe attributes and signaling mechanisms, so that when a dynamic subframe needs to be activated, the determination process is already streamlined and does not require complex real-time analysis, thus reducing operational complexity while maintaining adaptability.
3Adaptability or versatility
If dynamic subframe activation is implemented without clear function indication, then resource flexibility is improved, but information transmission reliability deteriorates
Solution Approach 1:
The patent implements a feedback mechanism through uplink indication fields in downlink control information. When a dynamic subframe is activated, the network sends explicit signaling to user equipment indicating whether the subframe functions as uplink or downlink. This feedback loop ensures that both network and user equipment have consistent understanding of subframe function, maintaining transmission reliability while enabling resource flexibility.
Data Source
AI summary
Indicating a attribute of a dynamic subframe in the scenario of applying the dynamic TDD subframe in a time division duplexing system includes: determining, by a user equipment, an attribute of a dynamic subframe, wherein the attribute of the dynamic subframe indicates that the dynamic subframe is an uplink subframe or that the dynamic subframe is a downlink subframe; and performing an information transmission according to the attribute of the dynamic subframe.