Dynamic Frequency Resource Allocation for Short TTI Wireless Systems
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Solution Overview
Problem
Current wireless communication systems face challenges in achieving low latency due to the unsuitability of traditional transmission time intervals (TTIs) for next-generation wireless communication systems, which require faster data rates and lower latency, especially in allocating frequency resources for short TTIs (sTTIs) to maintain reliable communication across various locations and mobility scenarios.
Innovation Solution
A method for dynamically allocating frequency resources to short TTIs (sTTIs) is introduced, where the number of resource elements in the control region is kept constant between sTTIs, utilizing a combination of RRC messages and Downlink Control Information (DCI) to schedule and demodulate multiple downlink channels across different frequency bands, ensuring efficient resource allocation and reduced complexity in control information generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional TTI structure is used, then system complexity is reduced, but latency requirement cannot be satisfied
Solution Approach 1:
The patent divides the traditional 1ms TTI into multiple shorter sTTIs (e.g., 2ms, 3ms, or 4ms TTIs can be segmented). This segmentation enables lower latency by allowing faster transmission and processing of data packets, directly addressing the latency requirement while managing complexity through structured division of the time resource.
Solution Approach 2:
The patent introduces dynamic control information generation mechanisms where the number of resource elements in the control region is kept constant between sTTIs, and DCI formats are dynamically adjusted based on scheduling needs. This dynamic approach allows the system to adapt to varying latency requirements while maintaining manageable complexity through standardized control structures.
2Productivity
If frequency resources are dynamically allocated to sTTIs, then transmission rate is improved, but resource allocation complexity increases
Solution Approach 1:
The patent employs universal DCI formats that can be used across different sTTI configurations and frequency resource allocation scenarios. This multi-functionality allows the same control structure to handle various transmission rates and resource allocation patterns, improving transmission efficiency while reducing the complexity that would arise from having separate control mechanisms for each scenario.
Solution Approach 2:
The patent utilizes parameter changes in DCI formats to dynamically indicate frequency resource allocations for sTTIs. By encoding resource allocation information in flexible parameters within standardized DCI structures, the system can adapt transmission rates to channel conditions and traffic requirements without requiring complex dedicated control protocols for each configuration.
3Device complexity
If control region resource elements are kept constant between sTTIs, then complexity of control information generation is reduced, but flexibility in resource allocation may be limited
Solution Approach 1:
The patent resolves the contradiction by moving the flexibility from the time dimension (constant control region across sTTIs) to the frequency dimension (flexible resource element allocation within each sTTI). The DCI formats carry information indicating which resource elements are allocated for control channels in each sTTI, allowing flexible frequency-domain resource allocation while maintaining a consistent control region structure, thereby reducing complexity without sacrificing adaptability.
Data Source
AI summary
A method and device for dynamically allocating resources to a frequency band of a short transmission time interval (TTI) in a wireless communication system is provided. Specifically, a plurality of first downlink channels and a second downlink channel included in a subframe corresponding to one TTI are received, wherein the plurality of first downlink channels are received during sTTIs and the second downlink channel is received during the TTI. The plurality of first downlink channels are sequentially received. The plurality of first downlink channels are demodulated using control information included in a downlink control information (DCI) used for the second downlink channel and an RRC message. The control information and RRC message indicate frequency resources for the plurality of first downlink channels.