Dynamic Subframe Retransmission in TDM Wireless Systems
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Solution Overview
Problem
In wireless communication systems, particularly in LTE and LTE-Advanced, there is a need for efficient retransmission methods that can adapt to dynamic subframe changes to optimize resource allocation and ensure seamless HARQ operations without disrupting existing configurations.
Innovation Solution
A method and apparatus for a user equipment (UE) in a time division multiplexing (TDM) wireless communication system that receives a reconfiguration request signal to change the use of an uplink (UL) subframe to a downlink (DL) subframe, terminating the UL retransmission process and adjusting signal transmission accordingly, using a processor to manage the RF communication module for efficient signal handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dynamic subframe reconfiguration is implemented to optimize resource allocation, then resource utilization efficiency is improved, but system complexity and potential for transmission errors increase
Solution Approach 1:
The patent applies preliminary action by establishing a predetermined relationship between downlink subframes and uplink retransmission subframes before dynamic reconfiguration occurs. The network configures multiple downlink subframes in advance that are associated with specific uplink retransmission opportunities, so when dynamic subframe switching happens, the UE can immediately determine which uplink subframe to use for retransmission based on the pre-established mapping, avoiding complex real-time calculations and reducing system complexity.
Solution Approach 2:
The patent implements dynamics by enabling flexible switching between different uplink-downlink configurations through dynamic subframe assignment. The network can adaptively change which subframes are designated as uplink or downlink based on traffic conditions, while the pre-configured mapping ensures that retransmission operations remain orderly despite these dynamic changes, thus optimizing resource utilization without proportionally increasing system complexity.
2Manufacturing precision
If uplink retransmission process is terminated upon subframe reconfiguration, then resource allocation accuracy is improved, but risk of data loss increases
Solution Approach 1:
The patent introduces an intermediary mechanism in the form of pre-configured mapping relationships that mediate between the dynamic subframe reconfiguration and the HARQ retransmission process. When subframe reconfiguration occurs, the predetermined mapping serves as an intermediary guide that tells the UE exactly which uplink subframe to use for retransmission, ensuring smooth transition without data loss while maintaining accurate resource allocation. This intermediary mapping layer decouples the complexity of dynamic reconfiguration from the reliability requirements of HARQ.
3Adaptability or versatility
If dynamic subframe assignment is used to increase service flexibility, then adaptability is improved, but probability of HARQ process conflicts increases
Solution Approach 1:
The patent applies segmentation by dividing the uplink subframes into distinct segments, each dedicated to retransmission for specific downlink subframes. The predetermined mapping creates clear segmentation between different HARQ processes, ensuring that even when dynamic subframe assignment changes the overall structure, each segmented retransmission path remains isolated and conflict-free, thus maintaining HARQ process integrity while allowing service flexibility.
Data Source
AI summary
Disclosed is a method for allowing a terminal to transmit and receive signals to and/from a base station in a wireless communication system using a time division multiplexing method. Specifically, the method comprises the steps of: receiving a request signal for resetting into a second uplink/downlink setting while transmitting and receiving a signal according to a first uplink/downlink setting; terminating an uplink retransmission process associated with a specific uplink subframe when the use of the specific uplink subframe is changed into a downlink subframe according to the second uplink/downlink setting; and applying the second uplink/downlink setting at a specific time point to transmit and receive signals.