LTE Terminal Uplink Semi-Persistent Scheduling Offset Configuration
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Solution Overview
Problem
In LTE radio communication systems, the specific procedure for a terminal apparatus to transmit uplink data, particularly under semi-persistent scheduling, is not adequately described, leading to inefficiencies in data transmission.
Innovation Solution
A terminal apparatus and base station apparatus that receive and transmit uplink-downlink configuration information using system information block type 1 and physical downlink control channels, with the terminal apparatus performing transmission on a physical uplink shared channel based on an uplink grant only in subframes indicated as uplink subframes, where the offset value for semi-persistent scheduling is set based on the initial uplink-downlink configuration when validated, and set to 0 when not validated.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If semi-persistent scheduling is implemented without clear offset configuration rules, then uplink data transmission can be supported, but transmission efficiency deteriorates due to ambiguity in determining valid transmission subframes
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the offset value based on the validation status of two-intervals-Semi-Persistent Scheduling. When validation is enabled, the offset is set to a non-zero value to enable semi-persistent scheduling; when disabled, the offset is set to 0. This parameter change resolves the ambiguity in determining valid uplink transmission subframes, thereby improving transmission efficiency while preventing incorrect interpretations of the offset configuration.
2Adaptability or versatility
If dynamic TDD with flexible subframes is implemented, then traffic adaptation is improved, but device complexity increases due to multiple uplink-downlink configurations
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple uplink-downlink configurations (first and second configurations) before dynamic TDD operation. The terminal stores these configurations in advance and selects between them based on validation status. This preliminary preparation simplifies the runtime decision-making process, allowing the system to adapt traffic patterns dynamically while managing configuration complexity through pre-established rules.
3Adaptability or versatility
If offset value is always set to non-zero for semi-persistent scheduling, then scheduling flexibility is improved, but reliability deteriorates when two-intervals-Semi-Persistent Scheduling is not validated
Solution Approach 1:
The patent applies dynamics by making the offset value dynamic rather than static. The offset is adjusted based on the real-time validation status of two-intervals-Semi-Persistent Scheduling. When validation is enabled, the offset takes a flexible non-zero value allowing semi-persistent scheduling; when validation is disabled, the offset becomes 0, preventing invalid transmissions. This dynamic adjustment maintains scheduling flexibility when needed while ensuring transmission reliability when the feature is not validated.
Data Source
AI summary
A terminal apparatus including a reception unit that receives first information indicating a first uplink-downlink configuration and receives second information indicating a second uplink-downlink configuration and a transmission unit that performs transmission on a physical uplink shared channel based on an uplink grant only in a subframe indicated as an uplink subframe by the second information, in which in a case where an uplink grant related to semi-persistent scheduling is considered to occur in a subframe specified based on at least a value of an offset and when two-intervals-Semi-Persistent Scheduling for an uplink is validated, the value of the offset is set based on the first uplink-downlink configuration, and when the two-intervals-semi-persistent scheduling for the uplink is not validated, the value of the offset is set to 0. Accordingly, the terminal apparatus can perform transmission of uplink data efficiently.