Grant-Free Uplink Resource Management for 5G URLLC
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Solution Overview
Problem
In radio communication systems, especially in 5G URLLC, the existing grant-free UL multiple access methods lead to inefficient resource utilization due to the possibility of no transmission, resulting in a high probability of resource collisions and error rate deterioration, which hampers low latency and high reliability data transmission.
Innovation Solution
The implementation of a user equipment with a resource management unit that retains configuration information for uplink data transmission without receiving explicit permission from the base station, and a transmission unit that signals uplink data transmission to the base station, enabling efficient resource allocation and utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If grant-free UL multiple access is used to enable uplink data transmission without explicit permission, then latency is reduced and transmission speed is improved, but resource utilization efficiency deteriorates due to no transmission occurrences and resource collisions
Solution Approach 1:
The base station transmits downlink control information containing resource allocation indications to user equipment based on detected uplink transmissions. This feedback mechanism allows the system to adapt resource allocation dynamically, improving resource utilization efficiency while maintaining the low-latency benefits of grant-free access by only adjusting resources when actual transmissions occur.
Solution Approach 2:
The patent transforms the static grant-free resource allocation into a dynamic system where the base station monitors uplink transmissions and adjusts resource allocation through downlink control information. This dynamic adaptation resolves the contradiction by making resource allocation flexible enough to handle varying transmission patterns while maintaining the speed advantages of grant-free access.
2Reliability
If grant-free UL multiple access is used to allow spontaneous uplink data transmission, then reliability for sudden data transmission is improved, but error rate deteriorates due to resource collisions between user equipments
Solution Approach 1:
The base station provides feedback through downlink control information to user equipment, indicating resource allocation status and detecting collisions. This feedback enables the system to identify and correct error-prone transmissions, maintaining high reliability for sudden data transmission while reducing error rates through active collision management.
Solution Approach 2:
The base station proactively transmits downlink control information to prevent future collisions by adjusting resource allocations before collisions occur. This preliminary anti-action maintains reliability for spontaneous transmissions while preemptively reducing error rates by avoiding resource conflicts.
3Reliability
If semi-static resource allocation is used for grant-free UL transmission, then resource collision probability is reduced, but resource utilization efficiency deteriorates due to high probability of no transmission
Solution Approach 1:
The patent introduces dynamic resource allocation through downlink control information, allowing the system to transition from static to adaptive resource management. This dynamics enables resources to be allocated based on actual transmission needs, resolving the contradiction between collision avoidance and utilization efficiency by making allocation flexible rather than rigid.
Solution Approach 2:
The base station changes resource allocation parameters dynamically through downlink control information based on detected transmission patterns. This parameter change capability allows the system to optimize both collision avoidance and resource utilization by adjusting allocation parameters in response to actual traffic conditions rather than maintaining fixed semi-static allocation.
Data Source
AI summary
A user equipment in a radio communication system including a base station and the user equipment, the user equipment including: a resource management unit that retains configuration information of a resource capable of transmitting uplink data without receiving uplink data transmission permission from the base station; and a transmission unit that transmits a signal indicating that uplink data transmission using the resource is performed to the base station.