Downlink Feedback Determination in 5G Wireless Communication
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently allocating data channels for downlink (DL) and uplink (UL) signaling, particularly in 5G networks, which are complex and diversified due to the increasing demand for higher data rates and diverse services like IoT, eMBB, mMTC, and URLLC, requiring improved transmission/reception technologies.
Innovation Solution
A method and apparatus for determining DL feedback information in a wireless communication system, where a terminal receives configuration information for uplink transmission from a base station, transmits data, and receives acknowledgement/negative acknowledgement signals, enabling efficient channel allocation and management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If code block group (CBG) based uplink transmission is configured to improve data transmission efficiency, then channel allocation efficiency is improved, but device complexity increases due to the need to manage and process multiple CBGs
Solution Approach 1:
The patent divides uplink data transmission into multiple code block groups (CBGs), where each CBG can be independently acknowledged. This segmentation allows the terminal to transmit data in manageable units and enables the base station to provide granular feedback, improving transmission efficiency without overwhelming the terminal with monolithic data blocks.
Solution Approach 2:
The patent implements a feedback mechanism where the base station sends ACK/NACK signals for each CBG or groups of CBGs. This feedback enables the terminal to identify which CBGs were successfully received and which need retransmission, optimizing resource utilization and improving overall data transmission efficiency while maintaining manageable complexity through selective retransmission.
2Productivity
If multiple code block groups are transmitted to increase data throughput, then productivity is improved, but the difficulty of detecting and measuring transmission status increases
Solution Approach 1:
By segmenting data into CBGs with individual acknowledgment capability, the patent transforms the detection problem from tracking a single large transmission to tracking multiple smaller, independently acknowledged units. This segmentation makes transmission status detection more manageable while maintaining high throughput.
Solution Approach 2:
The patent introduces an intermediary feedback mechanism where the base station provides explicit ACK/NACK signals for CBGs. This intermediary feedback system simplifies the detection process for the terminal by providing clear, base station-determined status information, eliminating the need for the terminal to independently track and interpret complex transmission states.
3Reliability
If CBG-based transmission with fine-grained ACK/NACK feedback is implemented to improve reliability, then reliability is improved, but device complexity increases due to enhanced processing requirements
Solution Approach 1:
The patent segments data into CBGs that can be independently acknowledged and retransmitted. This segmentation improves reliability by ensuring that only failed CBGs need retransmission rather than requiring retransmission of entire data blocks, while the processing complexity is managed through the modular CBG structure that simplifies error identification and recovery.
Solution Approach 2:
The patent changes the granularity parameter of feedback by providing ACK/NACK signals at the CBG level rather than at the entire transport block level. This parameter change enables fine-grained reliability control where successful CBGs are confirmed and only failed ones are retransmitted, improving overall transmission reliability while keeping processing complexity manageable through selective operation.
Data Source
AI summary
A communication scheme and a system thereof are provided for converging IoT technology and a 5G communication system for supporting a high data transmission rate beyond that of a 4G system. The disclosure can be applied to intelligent services based on the 5G communication technology and the IoT-related technology. Further, the disclosure provides a method of determining DL feedback information in a wireless communication system. The method includes receiving, from a BS, first information configuring a CBG based UL transmission; transmitting, to the BS, UL data including one or more CBGs, based on the first information; and receiving, from the BS, second information indicating an ACK or a NACK according to a reception result of the BS for the UL data.