Flexible Downlink Control Information for Variable TTI Scheduling
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Solution Overview
Problem
The existing LTE system has a fixed TTI length of 1 ms and the smallest resource allocation granularity is a PRB, which limits the flexibility in scheduling resources and cannot meet the demands of future services requiring smaller granularities and more flexible resource allocation.
Innovation Solution
The method involves transmitting Downlink Control Information (DCI) that includes information fields indicating the frequency and time resources occupied by scheduled data resources, as well as the identifiers of scheduled users, allowing for flexible allocation of resources in variable TTIs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed TTI length of 1 ms is used in existing LTE system, then the system structure is simple and stable, but the flexibility in scheduling resources is limited and cannot meet diverse service demands
Solution Approach 1:
The patent applies dynamics by making the TTI length variable rather than fixed. The base station can dynamically adjust the TTI length based on service requirements, enabling flexible resource scheduling while maintaining system adaptability to diverse services.
Solution Approach 2:
The patent changes the parameter of TTI length from a fixed value (1 ms) to a variable parameter that can be adjusted according to different service demands, allowing the system to adapt to different resource allocation requirements without changing the fundamental system architecture.
2Manufacturing precision
If the smallest resource allocation granularity is a PRB, then the resource allocation is standardized, but the granularity is too coarse for future services requiring smaller allocations
Solution Approach 1:
The patent segments the resource allocation unit from the coarse PRB level to a finer RE level. By allowing allocation at the RE granularity and enabling flexible combination of REs into different allocation units, the system achieves fine-grained resource control while maintaining adaptability to various service requirements.
3Adaptability or versatility
If DCI includes detailed frequency and time resource information fields, then the resource allocation flexibility is improved, but the DCI size increases
Solution Approach 1:
The patent applies partial action by including only the necessary resource indication information in the DCI, rather than all possible detailed information. The base station can indicate resources flexibly using a compact format, and the UE determines the exact allocation based on additional signaling or predefined configurations, reducing DCI size while maintaining flexibility.
Data Source
AI summary
A method and apparatus for transmitting downlink control information. In the present invention, transmitted downlink control information at least comprises one or more of the following information fields: a first information field used for indicating the frequency domain resources occupied by the data resources scheduled by the DCI, a second information field used for indicating the time frequency resources occupied by the data resources scheduled by the DCI, and a third information field used for indicating the scheduled N users. As the resource size occupied by the transmission resources in the frequency domain and/or in the time domain is indicated by means of the downlink control information, transmission of downlink control information can be implemented in flexible resource allocation scenarios having variable transmission time intervals.