Base Station Scheduling for Low Latency Communication
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Solution Overview
Problem
Current communication systems face challenges in reducing transmission latency and ensuring data transmission reliability, particularly as the number of users increases and higher frequency bands are utilized, such as in 5G networks, where existing methods fail to efficiently manage data transmission and retransmissions effectively.
Innovation Solution
The proposed method involves a base station transmitting scheduling information for data units in a communication system, using separate control channels for initial and retransmitted data, allowing for efficient retransmission of data units based on acknowledgement responses from terminals, thereby reducing latency and improving data reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data transmission uses traditional sequential retransmission methods waiting for HARQ responses, then protocol simplicity is maintained, but transmission latency increases and reliability decreases
Solution Approach 1:
The base station performs preliminary actions by pre-allocating retransmission resources and preparing retransmission scheduling information before receiving HARQ responses. The system advances the retransmission timing to occur before the traditional HARQ feedback is fully processed, allowing the terminal to combine and decode data in advance. This preliminary preparation of retransmission resources and scheduling information resolves the contradiction by reducing latency while maintaining reliability through proactive resource allocation.
2Reliability
If the base station waits for HARQ responses before scheduling retransmission, then control channel complexity is reduced, but data transmission reliability deteriorates due to increased latency
Solution Approach 1:
The base station performs preliminary scheduling actions by allocating retransmission resources and preparing second scheduling information in advance, before receiving complete HARQ responses. This preliminary scheduling allows the system to maintain reliability through proactive resource preparation while managing control channel complexity through structured advance allocation mechanisms.
Solution Approach 2:
The system utilizes HARQ feedback mechanisms where the terminal sends acknowledgment information back to the base station. The base station uses this feedback to determine which data units require retransmission and schedules them accordingly. This feedback loop enables reliable data transmission while the base station manages control channel complexity by processing feedback efficiently and scheduling retransmissions based on received acknowledgment information.
3Productivity
If traditional sequential data transmission is used, then system simplicity is maintained, but communication service quality deteriorates under increasing user load
Solution Approach 1:
The base station performs preliminary resource allocation and scheduling preparation in advance, allocating retransmission resources before receiving complete HARQ responses. This preliminary action enables the system to handle increasing user load more effectively by preparing resources proactively, improving communication service quality through reduced latency and maintained reliability, while managing complexity through structured advance allocation.
Solution Approach 2:
The system dynamically adjusts transmission parameters including timing advance values and resource allocation based on real-time conditions. The base station determines timing advance values and allocates resources dynamically according to user requirements and channel conditions. This dynamic adaptation enables the system to maintain high communication service quality under varying user loads while managing complexity through flexible, condition-based parameter adjustment.
Data Source
AI summary
Disclosed are a method and a device for low latency communication in a communication system. An operation method of a base station comprises the steps of: transmitting first scheduling information of data units, transmitted through A sections in subframe #n, to a terminal through a first control channel in subframe #n; transmitting the data units to the terminal through the A sections; and transmitting second scheduling information of data unit(s), transmitted through B section(s) in subframe #(n+k) following subframe #n, to the terminal through a second control channel in subframe #(n+k). Therefore, the performance of the communication system can be improved.