Uplink-Downlink Configuration Adaptation in LTE TDD Systems
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Solution Overview
Problem
Current LTE TDD systems have limited flexibility in configuring transmission resources, leading to inefficient utilization of frequency spectrum due to slow changes in uplink-downlink configurations, which fail to adapt quickly to fluctuating service volumes.
Innovation Solution
Implementing a second uplink-downlink configuration change period that is shorter than the system message change period, allowing for more frequent updates to uplink-downlink configurations through system broadcast messages or dedicated radio resource control signaling, enabling better adaptability to varying service conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the system uses the standard SIB1 message with an 80ms transmission period and slow update rate, then system stability and energy consumption are optimized, but the uplink-downlink configuration cannot adapt quickly to fluctuating service volumes
Solution Approach 1:
The patent segments the configuration update mechanism into two parts: the standard SIB1 message for stable, long-term configurations and a new fast indication message for rapid, short-term adjustments. This segmentation allows the system to maintain stability through SIB1 while achieving fast adaptability through the indication message, resolving the contradiction between slow update rates and rapid service adaptation needs.
Solution Approach 2:
The patent introduces a pre-configured indication message format and mechanism that prepares the system for rapid configuration changes before they are needed. By establishing the fast indication framework in advance (separate from SIB1), the system can immediately respond to service fluctuations without waiting for the next SIB1 transmission cycle, thus reducing configuration update delay.
2Adaptability or versatility
If the system increases the frequency of uplink-downlink configuration updates to match service fluctuations, then service adaptability improves, but system complexity and signaling overhead increase
Solution Approach 1:
The patent extracts the fast configuration indication function from the heavy SIB1 message structure, creating a lightweight, separate indication mechanism. This extraction allows rapid configuration updates without burdening the system with increased SIB1 transmission frequency or complexity. The indication message is a simplified, dedicated structure that handles only the essential configuration change notifications.
Solution Approach 2:
The patent implements a dynamic configuration update mechanism where the indication message can be triggered on-demand based on service conditions rather than following a fixed schedule. This dynamic approach allows the system to increase configuration update frequency only when necessary, avoiding unnecessary signaling overhead during stable periods while maintaining high adaptability when service fluctuations occur.
Data Source
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AI summary
Embodiments of the present invention disclose a method for configuring a transmission resource, a related device, and a communication system. The method for configuring a transmission resource includes: notifying, by an access device, a user equipment of a second uplink-downlink configuration change period, where the second uplink-downlink configuration change period is less than a system message change period; and sending, by the access device, a first message to the user equipment, where the first message carries an uplink-downlink configuration indication corresponding to the second uplink-downlink configuration change period, so that the user equipment updates, according to the uplink-downlink configuration indication, an uplink-downlink configuration used by the user equipment. The solutions according to the embodiments of the present invention help to improve flexibility for configuring a transmission resource and a utilization rate of a frequency spectrum resource.