Uplink Retransmission Priority Scheduling for 5G Collision Management
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Solution Overview
Problem
In 5G communication systems, contention-based uplink data transmission leads to collisions and excessive power consumption due to repetitive random access attempts, causing delays and interference, especially with the increasing demand for rapid uplink data transmission.
Innovation Solution
An evolved Node B (eNB) determines priorities for User Equipment (UEs) and transmits priority information to identify resources for retransmitting data, using a combination of dedicated and contention-based scheduling schemes to minimize collisions and delay by sending NACK signals and allocating specific resources for retransmissions based on priority and number of UEs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If contention-based uplink data transmission is used, then access flexibility and system throughput are improved, but collisions occur causing retransmission delays and increased power consumption
Solution Approach 1:
The patent applies preliminary action by having UEs transmit priority information and collision detection information in advance before actual data transmission. The eNB determines priorities and pre-configures retransmission resources based on this advance information, allowing faster retransmission when collisions occur without requiring complex real-time decisions.
Solution Approach 2:
The patent implements feedback mechanisms where the eNB sends NACK signals to indicate collisions, and UEs use received priority information and collision detection results to determine retransmission timing. This feedback loop enables the system to quickly recover from collisions by using the feedback information to schedule retransmissions in dedicated resources.
2Reliability
If repetitive random access attempts are made, then access reliability is improved, but power consumption increases excessively
Solution Approach 1:
The patent applies local quality by treating different UEs differently based on their priority levels. High-priority UEs receive dedicated retransmission resources and are handled with higher urgency, while lower-priority UEs follow standard contention-based procedures. This differentiated treatment maintains access reliability for critical traffic while reducing unnecessary retransmission attempts for less critical data, thereby lowering overall power consumption.
Solution Approach 2:
The patent changes the parameter of retransmission strategy based on priority information. Instead of uniform random access attempts, the system adjusts retransmission behavior according to priority levels - high-priority UEs get dedicated scheduling while lower-priority UEs use contention-based access. This parameter change reduces the number of repetitive access attempts and associated power consumption while maintaining reliability where needed.
3Productivity
If priority-based resource allocation is implemented, then retransmission efficiency is improved, but system complexity increases
Solution Approach 1:
The patent segments the uplink transmission system into different priority classes with dedicated resources for high-priority UEs and shared resources for lower-priority UEs. This segmentation simplifies the scheduling logic by dividing the complex task of managing all UEs into separate, more manageable groups, each with specific access rules and resource allocations.
Solution Approach 2:
The patent makes the priority information and collision detection mechanism universal, applicable to all UEs regardless of their specific requirements. The same priority determination and resource allocation framework serves multiple purposes - managing both dedicated and contention-based access, handling both initial transmissions and retransmissions, thereby reducing overall system complexity through a unified approach.
Data Source
AI summary
A 5th Generation (5G) or pre-5G communication system for supporting a higher data rate than a 4G communication system such as Long Term Evolution (LTE) is provided. A method of an evolved Node B (eNB) can include detecting a collision caused by first data received from a first terminal in a time resource for contention-based uplink data transmission and second data received from a second terminal in the time resource, determining a first delay value in first data retransmission using a dedicated scheduling scheme, and determining a second delay value in the first data retransmission using a contention-based uplink data transmission scheme, determining a scheme for retransmitting the first data based on the first delay value and the second delay value, and transmitting information indicating the determined scheme to the first terminal.