Wireless Frame Structure for Low-Latency 5G Data Reception
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Solution Overview
Problem
The existing 3GPP LTE frame structure with a 1 ms transmission time interval (TTI) cannot meet the reduced data request latency requirements of 5G technology, which aims for latency 10 times lower, necessitating a new frame structure with shorter TTI to support low-latency applications in 5G communication systems.
Innovation Solution
A method and apparatus for a user equipment (UE) to receive data for each service by utilizing a specific frame structure, where a first control channel and first data channel are received on the total system bandwidth, and a second control channel and second data channel are received through a specific subband, with the second control channel potentially using frequency hopping if the subband includes more than 6 resource blocks, allowing for efficient low-latency data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a frame structure with TTI of 1 ms is used, then system compatibility with existing LTE is maintained, but data request latency cannot be reduced to meet 5G requirements
Solution Approach 1:
The patent segments the frame structure into different types (Type 1 with 1ms TTI for legacy services, Type 2 with shorter TTI for low-latency services) and different services (eMBB, URLLC, mMTC) can be assigned to different segments. This allows simultaneous support of multiple service requirements without requiring complete system redesign.
Solution Approach 2:
The patent introduces dynamic frame structure configuration where the network can flexibly switch between different frame types and adjust TTI lengths based on service requirements. This dynamic adaptation enables the system to optimize latency performance for specific services while maintaining overall system compatibility.
2Loss of time
If a new frame structure with shorter TTI is introduced for 5G, then data latency is reduced, but compatibility with legacy LTE systems is compromised
Solution Approach 1:
The patent designs a universal frame structure framework that can accommodate multiple service types and TTI configurations within the same system. The Type 1 frame structure maintains LTE compatibility for legacy services, while Type 2 frame structure enables shorter TTI for 5G low-latency services, making the system universally adaptable to both legacy and advanced requirements.
Solution Approach 2:
The patent applies different frame structure qualities to different services and frequency bands. Legacy services continue to use the familiar 1ms TTI structure, while new low-latency services utilize shorter TTI configurations. This localized differentiation allows compatibility to be maintained where needed while enabling innovation where required.
3Reliability
If frequency hopping is applied to control channels in subbands with more than 6 resource blocks, then robustness against fading is improved, but processing complexity increases
Solution Approach 1:
The patent changes the parameter of frequency hopping application based on subband size. Frequency hopping is selectively applied only to subbands with more than 6 resource blocks, while smaller subbands use conventional transmission. This parameter-based differentiation improves robustness where needed while avoiding unnecessary complexity in smaller subbands.
Data Source
AI summary
The method for a terminal for receiving data for each service from a particular frame in a wireless communication system according to the present invention comprises the steps of: receiving, from a base station, a first control channel comprising first control information associated with a first service; receiving, from the base station and on the basis of the control information, a first data channel utilized for transmitting the first service; receiving, from the base station, a second control channel comprising second control information associated with a second service; and receiving, from the base station and on the basis of the second control information, a second data channel utilized for transmitting the second service, wherein the first and second services are services of mutually different types, and the first control channel is received by means of the full system bandwidth configured on the terminal, and the second control channel and second data channel are received by means of a particular sub-band within the full system bandwidth.