Terminal Apparatus Subframe Configuration for PHICH Resource Alignment
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Solution Overview
Problem
In LTE systems, terminals with different UL-DL configurations (SIB1-indicated and TDD eIMTA) face challenges in correctly receiving PHICH and downlink control information due to mismatched recognition of PHICH groups, leading to scheduling constraints for base stations.
Innovation Solution
A terminal and base station apparatus that dynamically adjust subframe configuration patterns to align resource associations for PHICH and downlink control information, using resources associated with the first subframe in the configuration pattern, even when different configuration patterns are set, to ensure correct demultiplexing and transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If terminals with different UL-DL configurations (SIB1-indicated and TDD eIMTA) operate simultaneously, then system adaptability and flexibility are improved, but scheduling constraints and resource allocation complexity increase due to mismatched PHICH group recognition
Solution Approach 1:
The patent applies local quality by configuring different PHICH group number settings for different terminals based on their specific UL-DL configuration types. SIB1-indicated terminals use one PHICH group configuration while TDD eIMTA terminals use another, allowing each terminal type to operate with optimized parameters for its configuration pattern without interfering with others
Solution Approach 2:
The patent implements dynamics by enabling the base station to dynamically determine and apply different PHICH group number settings based on the terminal's configuration pattern. The system can adaptively switch between different PHICH configurations depending on whether the terminal uses SIB1-indicated or TDD eIMTA UL-DL configurations, allowing flexible resource allocation
2Reliability
If different PHICH group number settings are used for different UL-DL configurations, then correct PHICH and DCI reception is achieved, but resource allocation overhead increases
Solution Approach 1:
The patent changes the PHICH group number parameter based on the terminal's UL-DL configuration type. By adjusting this specific parameter (PHICH group number) according to whether the terminal uses SIB1-indicated or TDD eIMTA configurations, the system achieves correct signal reception without requiring complete resource reallocation
Data Source
AI summary
Provided is a terminal apparatus that, when two terminals having mutually different subframe structure patterns are coexistent, can suppress DCI scheduling constraints of those terminals in a base station. In a terminal, a signal separation unit separates, from a received signal, both a response signal assigned to a first resource determined on the basis of a number of resources associated with the first subframes in which the signal was received and downstream control information assigned to a second resource. It should be noted that at a timing when both a first structure pattern that has been set in the terminal and a second structure pattern that has been set in another terminal that cannot change the setting of the structure pattern are the first subframes, the signal separation unit uses a number of resources associated with the first subframes of the second structure pattern.