sTTI Control Channel Element Configuration for Low Latency Wireless
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Solution Overview
Problem
Current wireless communication systems face challenges in achieving low latency due to the existing structure of transmission time intervals (TTIs) in 3GPP LTE, which is not suitable for next-generation wireless communication systems requiring faster data rates and lower latency.
Innovation Solution
The proposed method involves using a plurality of control channels and data channels transmitted by multiple symbols in a wireless communication system, with a short TTI (sTTI) structure, where a control channel element is configured using a resource element group in the same symbol, and the control channel is aggregated across symbols to minimize decoding time, allowing for efficient allocation of resources in an FDM manner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a conventional TTI structure is used, then system compatibility is maintained, but user plane latency cannot meet the 1 ms requirement
Solution Approach 1:
The conventional TTI is segmented into multiple sTTIs (short TTIs), where each sTTI can independently carry control and data channels. This segmentation allows the system to achieve shorter transmission time intervals (1 ms or less) while maintaining compatibility with existing LTE infrastructure through proper resource allocation and signaling mechanisms.
2Productivity
If control channel elements are distributed across multiple symbols, then resource utilization is improved, but decoding time increases
Solution Approach 1:
The control channel element is segmented into multiple parts distributed across different resource element groups within the same symbol or adjacent symbols. This allows parallel processing and decoding of control information, reducing overall decoding time while effectively utilizing available time-frequency resources.
Solution Approach 2:
Control channel elements are preliminarily organized into resource element groups with predetermined structures before transmission. This pre-organization enables the receiver to efficiently locate and decode control information without requiring complex search procedures, thereby reducing decoding time while maintaining high resource utilization.
Data Source
AI summary
Provided are a method and an apparatus for performing communication in a wireless communication system. Specifically, a control channel element is configured by using a resource element group in the same symbol of a resource block. The resource element group includes a plurality of resource elements in the same symbol. The resource block is transmitted in units of sTTIs which is set to be shorter than TTI. A control channel corresponding to the control channel element, and a data channel scheduled by the control channel are configured. The control channel and the data channel are transmitted in different frequency bands. Data is transmitted through the data channel.