Uplink Data Transmission Bundled Subframe Scheduling
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Solution Overview
Problem
LTE TDD systems face limitations in coverage performance due to restricted scheduling resources for latency-sensitive services like VoIP, which results in suboptimal signal transmission efficiency.
Innovation Solution
The introduction of bundled subframes increases scheduling resources for the PUSCH by allowing multiple subframes to be used for data transmission, enhancing coverage performance by optimizing subframe bundling configurations and timing relationships to meet transmission latency requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional uplink/downlink subframe configuration is used in LTE TDD system, then system structure is simple, but scheduling resources for PUSCH are limited and coverage performance is poor
Solution Approach 1:
The patent segments the uplink transmission time by dividing it into multiple bundled subframes. Instead of transmitting data in a single subframe, the data is transmitted across multiple consecutive uplink subframes (e.g., 2-4 subframes), effectively segmenting the transmission resource in the time domain. This segmentation increases the total scheduling resources available for PUSCH and improves coverage performance.
Solution Approach 2:
The patent introduces subframe bundling in the time dimension by combining multiple subframes into a bundled subframe structure. This adds a temporal dimension to the resource allocation, transforming the traditional single-subframe transmission into a multi-subframe bundled transmission, thereby increasing scheduling resources without changing frequency or spatial dimensions.
2Reliability
If multiple subframes are bundled for PUSCH transmission, then scheduling resources increase and coverage performance improves, but system complexity increases
Solution Approach 1:
The patent implements dynamic subframe bundling where the network can flexibly configure the number of bundled subframes (e.g., 2, 3, or 4 subframes) based on service requirements and channel conditions. The base station dynamically adjusts the bundling configuration through downlink control information, allowing the system to adapt between different bundling modes to balance performance and complexity.
Solution Approach 2:
The patent changes the time-domain parameter by extending the transmission duration across multiple subframes. By adjusting the subframe bundling parameter (number of bundled subframes), the system can control the trade-off between coverage performance and complexity. Larger bundling values improve coverage but increase complexity, while smaller values reduce complexity but limit coverage enhancement.
3Reliability
If subframe bundling is implemented to enhance coverage, then transmission resources are optimized, but latency requirements must be carefully managed
Solution Approach 1:
The patent applies preliminary action by pre-configuring the subframe bundling parameters and timing relationships before actual data transmission. The network pre-establishes the bundled subframe structure and timing advance values, so that when data needs to be transmitted, the UE can immediately use the pre-configured resources without additional negotiation delays, thus managing latency efficiently.
Solution Approach 2:
The patent utilizes periodic action through regular uplink transmission opportunities within the bundled subframes. By establishing periodic transmission patterns with predictable timing, the system ensures that latency-sensitive services like VoIP can rely on regular transmission intervals, making the latency behavior predictable and manageable despite the extended transmission duration.
Data Source
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AI summary
Embodiments of the present invention provide a method for transmitting uplink data, user equipment, and a base station. The method includes: when user equipment UE correctly receives, in a subframe n, downlink control signaling used for instructing the UE to transmit a physical uplink shared channel PUSCH, determining, by the UE according to the downlink control signaling and a subframe bundling configuration, a bundled subframe for transmitting the PUSCH, where the subframe bundling configuration includes a quantity of bundled subframes; and transmitting the PUSCH in the bundled subframe. In the embodiments of the present invention, a bundled subframe is introduced, which increases scheduling resources for a PUSCH, and enhances coverage performance of a signal.