Control and Data Signal Transmission Across Misaligned Carrier Frames
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Solution Overview
Problem
In a carrier aggregation environment, the frame boundaries between carriers do not match, leading to challenges in signal transmission and reception between a terminal and a base station.
Innovation Solution
A method and device for a communication system that includes receiving carrier aggregation configuration information, offset information on frame boundaries, and time domain resource allocation information to identify and transmit/receive data in specific slots, aligning frame boundaries between cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation is implemented to increase data transmission capacity, then network throughput and service capability are improved, but frame boundary misalignment between carriers causes signal transmission and reception problems
Solution Approach 1:
The base station performs preliminary actions by determining the slot index for data transmission before actual data transmission occurs. It calculates the slot index in the second cell based on the slot index in the first cell where control information is transmitted, and sends this determined slot index to the terminal in advance through downlink control information, enabling the terminal to prepare for data reception at the correct time
Solution Approach 2:
The slot index determination mechanism acts as an intermediary between the control information in the first cell and the data transmission in the second cell. By introducing this intermediate parameter (slot index) that bridges the two cells with different frame structures, the system resolves the misalignment issue without requiring frame boundary synchronization between carriers
2Reliability
If frame boundaries between carriers are aligned to ensure synchronized transmission, then signal reliability is improved, but flexibility in carrier frequency selection and configuration is reduced
Solution Approach 1:
The system segments the carrier aggregation configuration into independent cells with independent frame structures. Each cell (first cell and second cell) can have its own frame boundary timing, and the patent handles the mapping between them through slot index determination, allowing each carrier to be configured independently without requiring global frame alignment
Solution Approach 2:
The patent changes the parameter representation from fixed frame boundary alignment to dynamic slot index mapping. By using configurable parameters such as the slot index offset and subcarrier spacing configurations, the system adapts to different carrier frequencies and frame structures while maintaining reliable data transmission through calculated slot correspondence
3Adaptability or versatility
If different subcarrier spacings are used in different cells to optimize performance, then system adaptability is improved, but determining the corresponding data slot becomes complex
Solution Approach 1:
The base station performs self-service by autonomously determining the slot index in the second cell based on the slot index in the first cell and the configured offset information. The base station calculates the corresponding slot index using the relationship between different subcarrier spacings and frame structures, then provides this determined slot index to the terminal through downlink control information, eliminating the need for the terminal to perform complex calculations
Data Source
AI summary
The present disclosure relates to a communication technique for combining an IoT technology with a 5G communication system for supporting a higher data transmission rate than a 4G system, and a system therefor. The present disclosure can be applied to intelligent services (for example, smart homes, smart buildings, smart cities, smart cars or connected cars, health care, digital education, retail businesses, security and safety-related services, and the like) on the basis of 5G communication technologies and IoT-related technologies. The present disclosure relates to a method of a terminal in a communication system, the method comprising the steps of: receiving carrier aggregation configuration information from a base station; receiving offset information for a frame boundary between a first cell and a second cell from the base station; receiving, from the base station, control information including time domain resource allocation information indicating an interval between a slot in which data scheduled by the control information transmitted or received and a slot in which the control information is received into the first cell; identifying an index of the slot in which the data is transmitted or received, on the basis of the offset information and the time domain resource allocation information; and transmitting the data to or receiving the data from the base station on the second cell in the slot of the identified index.