TDD Subframe Configuration Adaptation for Random Access Reliability
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Solution Overview
Problem
Current wireless communication systems, particularly in LTE networks, face challenges in adapting TDD UL/DL subframe configurations dynamically to match varying traffic demands, leading to potential miscommunication and inefficiencies during random access procedures.
Innovation Solution
A method and apparatus for user equipment (UE) to receive and adapt TDD UL/DL subframe configurations, switching between default and dynamic configurations based on the success or failure of random access procedures, allowing for flexible and adaptable communication by using dedicated RRC signaling and PHY signaling to adjust subframe allocations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the network dynamically changes TDD UL/DL subframe configuration to adapt to varying traffic demands, then adaptability is improved, but miscommunication occurs during random access procedures due to configuration mismatch between UE and network
Solution Approach 1:
The network performs preliminary action by transmitting the default TDD UL/DL subframe configuration to the UE before the random access procedure begins. This ensures the UE has the necessary configuration information in advance to properly time its random access messages, preventing configuration mismatch errors while still allowing dynamic configuration changes to occur afterward.
Solution Approach 2:
The system implements dynamics by allowing the TDD UL/DL subframe configuration to change from a default state to a dynamic state after random access completion. The configuration is fixed during the random access procedure to ensure reliability, then becomes dynamic afterward to adapt to traffic demands, resolving the contradiction between stability and adaptability.
2Productivity
If the UE uses the dynamic TDD UL/DL subframe configuration during random access procedure, then communication efficiency is improved, but miscommunication occurs due to configuration mismatch between UE and network
Solution Approach 1:
The invention applies local quality by differentiating the configuration requirements for different phases of communication. During the random access procedure, the UE uses the default configuration to ensure reliable message timing. After successful random access, the UE switches to the dynamic configuration for efficient data transmission. This localized application of different configuration qualities resolves the contradiction.
Solution Approach 2:
The network performs preliminary action by providing the default configuration before random access, ensuring the UE can properly time its access messages. This preliminary provision of configuration information prevents miscommunication while still enabling dynamic configuration for subsequent efficient communication.
3Stability of the object's composition
If the network maintains a fixed TDD UL/DL subframe configuration, then configuration stability is improved, but the network cannot adapt to varying traffic demands
Solution Approach 1:
The system implements a two-phase dynamic approach: first stable (default configuration during random access), then adaptive (dynamic configuration after access). This temporal differentiation allows the system to enjoy both stability and adaptability at appropriate times, resolving the contradiction between fixed and dynamic configuration requirements.
Solution Approach 2:
The network provides the default configuration in advance before random access occurs, establishing a stable baseline. After successful access, the network can then dynamically adjust the configuration to match traffic demands. This preliminary establishment of stability enables subsequent adaptability without compromising random access reliability.
Data Source
AI summary
The present invention relates to a wireless communication system. More specifically, the present invention relates to random access procedures in a wireless network employing TDD scheme. According to one aspect of the present invention, the a user equipment (UE), receiving information a first time division duplex (TDD) uplink/downlink (UL/DL) subframe configuration and information on a second TDD UL/DL subframe configuration informing the UE of a change from the first TDD UL/DL subframe configuration, communicates with the network based on the second TDD UL/DL subframe configuration, but performs a random access procedure based on the first TDD UL/DL subframe configuration, when the random access procedure is initiated.