LTE Base Station Subframe Configuration Segmentation
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Solution Overview
Problem
In LTE communication systems, there is a risk of uplink signal interference due to terminal apparatuses erroneously transmitting signals during subframes intended for downlink signals, leading to incorrect decoding of scheduling information.
Innovation Solution
A base station apparatus and terminal apparatus communication method that includes transmitting and receiving configuration information to determine subframe allocations for physical downlink control channels, shared channels, and HARQ-ACK transmissions, ensuring correct subframe usage and reducing the likelihood of interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traffic adaptation technique is applied to dynamically change uplink-downlink subframe ratio, then communication throughput is improved, but the probability of terminal apparatus erroneously transmitting uplink signals in downlink subframes increases
Solution Approach 1:
The patent segments the subframe configuration information into three distinct configuration sets (first, second, and third configuration sets) with progressively restricted options. This segmentation allows the system to provide detailed scheduling control while preventing terminal apparatus from selecting incompatible configurations, thereby resolving the contradiction between throughput improvement and reliability maintenance.
Solution Approach 2:
The base station apparatus performs preliminary action by pre-defining and transmitting multiple configuration sets with restricted options before the terminal apparatus makes scheduling decisions. This preliminary configuration restriction prevents erroneous uplink transmissions in downlink subframes while maintaining the flexibility needed for traffic adaptation and throughput improvement.
2Adaptability or versatility
If flexible subframe configuration is allowed for traffic adaptation, then resource allocation efficiency is improved, but interference between uplink and downlink signals occurs
Solution Approach 1:
The patent applies local quality by allowing flexible subframe configuration only within locally restricted configuration sets that are compatible with each other. The first, second, and third configuration sets define local quality constraints that prevent uplink-downlink interference while maintaining adaptability for traffic patterns. This resolves the contradiction by enabling flexibility only where it does not create harmful interference.
3Measurement precision
If multiple configuration parameters are transmitted for precise subframe control, then scheduling accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent implements dynamics by allowing the base station apparatus to dynamically select and transmit only the necessary configuration sets from the first, second, and third configuration sets based on current traffic conditions. This dynamic approach provides precise subframe scheduling control while adapting the signaling overhead to actual needs, resolving the contradiction between precision and information volume.
Data Source
AI summary
A base station apparatus includes a transmission unit that transmits first information indicating a first configuration, second information indicating a second configuration, and third information indicating a third configuration, in which the first configuration is used to determine a correspondence between a subframe in which a PDCCH is allocated and a subframe in which a PUSCH corresponding to the PDCCH is allocated, in which the second configuration is an element of a configuration set which is restricted on the basis of the first configuration, and is used to determine a correspondence between a subframe in which a PDSCH is allocated and a subframe in which a HARQ-ACK corresponding to the PDSCH is transmitted, and in which the third configuration is an element of a configuration set which is restricted on the basis of the first configuration and the second configuration, and is used to specify a subframe in which the PDCCH is monitored.