Dynamic Subframe Aggregation for LTE TTI Bundling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing LTE system's fixed subframe configuration in TTI bundling reduces spectrum resource usage efficiency and increases consumption due to inflexibility in adapting to user equipment channel conditions, leading to suboptimal low-latency and high-reliability service performance.
Innovation Solution
The method involves dynamically indicating the quantity of subframes and redundancy versions in subframe aggregation based on channel conditions through downlink control information, allowing for flexible configuration of subframe types and resource allocation to improve system performance and resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed quantity of four subframes is used in TTI bundling, then transmission reliability is improved through redundancy, but spectrum resource usage efficiency is reduced and spectrum resource consumption is increased
Solution Approach 1:
The patent applies dynamics by making the TTI bundling subframe quantity configurable rather than fixed. The base station can dynamically adjust the number of subframes in a TTI bundle based on channel conditions and service requirements, allowing the system to adapt between using more subframes for reliability when needed and fewer subframes for efficiency when conditions permit.
Solution Approach 2:
The patent changes the parameter of TTI bundling subframe quantity from a fixed value (4) to a configurable parameter. Through downlink control information, the base station can indicate different subframe quantities (1, 2, or 4 subframes) to different user equipment, enabling flexible adjustment of redundancy levels and spectrum resource consumption according to actual channel conditions.
2Reliability
If a fixed quantity of four subframes is used in TTI bundling, then redundancy is ensured for reliable transmission, but service delay increases due to inability to flexibly adapt to channel conditions
Solution Approach 1:
The patent enables dynamic adjustment of TTI bundling duration by allowing the base station to configure different subframe quantities based on real-time channel conditions. When channel conditions are good, fewer subframes are used to reduce delay; when conditions are poor, more subframes provide necessary redundancy, thus dynamically balancing reliability and delay.
Solution Approach 2:
The patent changes the fixed parameter of TTI bundling subframe quantity into a flexible configurable parameter. Through downlink control information carrying subframe quantity indication, the system can adjust the time duration of TTI bundling to match channel conditions, reducing unnecessary time consumption when high redundancy is not needed while maintaining reliability when conditions require it.
3Reliability
If subframe aggregation quantity is increased to improve transmission reliability, then data transmission reliability is enhanced, but resource consumption increases
Solution Approach 1:
The patent changes the subframe aggregation quantity from a fixed value to a configurable parameter that can be adjusted based on channel conditions. The base station can indicate different aggregation quantities (1, 2, or 4 subframes) through downlink control information, enabling the system to optimize the balance between transmission reliability and spectrum resource consumption for each user equipment according to its specific channel conditions.
Data Source
AI summary
Embodiments of the present disclosure relate to the field of communications technologies, and provide an information transmission method and apparatus, to flexibly set a quantity of subframes in subframe aggregation and a redundancy version based on a channel condition. The method includes: sending, by a first device, downlink control information to a second device, where the downlink control information includes subframe aggregation information, and the subframe aggregation information is used by the first device to indicate, to the second device, a quantity of subframes used in subframe aggregation and/or a redundancy version corresponding to at least one of subframes used in subframe aggregation; and receiving, by the first device, uplink information sent by the second device according to the downlink control information. The embodiments of the present disclosure are used for subframe aggregation.