Reserved RA Preambles for URLLC Data Transmission
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Solution Overview
Problem
Current 5G communication systems face challenges in efficiently transmitting intermittent data with ultra-reliable low latency communication (URLLC) requirements, particularly in factory automation systems, where existing methods lead to increased transmission delays and signaling overheads due to the need for scheduling requests and RRC connection establishment procedures.
Innovation Solution
The proposed solution involves reserving a random access (RA) preamble in advance for delay-sensitive data transmission, allowing terminals to transmit data using a reserved RA preamble without transitioning to an RRC connected state, and managing RA preambles into groups for efficient resource utilization, with configuration information determining the number and indices of preambles based on reserved ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If terminals use existing random access procedures for intermittent data transmission, then data can be transmitted, but transmission delays and signaling overheads increase due to scheduling requests and RRC connection establishment
Solution Approach 1:
The base station pre-allocates and reserves specific RA preambles for URLLC intermittent data transmission before the terminal needs to send data. This preliminary allocation eliminates the need for scheduling requests and RRC connection establishment, allowing terminals to directly use the reserved preambles for immediate data transmission, thereby reducing transmission delay and signaling overhead
Solution Approach 2:
The patent extracts and separates the RRC connection establishment procedure and scheduling request mechanisms from the random access procedure for URLLC data transmission. By removing these unnecessary steps and allowing direct use of reserved RA preambles, the solution simplifies the transmission process while maintaining reliability, thus reducing both transmission delay and signaling overhead
2Speed
If RA preambles are reserved in advance for delay-sensitive data, then transmission speed improves, but RA preamble resource management complexity increases
Solution Approach 1:
The patent segments RA preambles into different groups, with specific preambles reserved for URLLC delay-sensitive data transmission while other preambles remain available for general use. This segmentation allows the system to provide fast transmission for urgent data through pre-reserved preambles while maintaining overall resource efficiency and manageable complexity through structured organization
Solution Approach 2:
The base station dynamically adjusts parameters related to RA preamble reservation, such as the number of reserved preambles and their allocation patterns, based on traffic conditions and URLLC requirements. This parameter adjustment mechanism enables flexible resource management that balances transmission speed requirements with resource management complexity
3Device complexity
If terminals transmit intermittent data without RRC connection establishment, then signaling overhead reduces, but transmission reliability may be compromised
Solution Approach 1:
The base station performs preliminary configuration and reservation of RA preambles for URLLC transmission, establishing reliable transmission paths in advance. This preliminary action ensures that when terminals transmit intermittent data without full RRC connection establishment, they use pre-validated and reserved resources that guarantee transmission reliability while reducing signaling overhead
Data Source
AI summary
Disclosed are methods and apparatuses for transmitting data using a random access procedure in a communication system. An operation method of a terminal in a communication system includes transmitting a first MsgA including an RA preamble #i and a payload to a base station; receiving, from the base station, a MsgB including information indicating that an RA preamble #k is reserved; and transmitting a second MsgA including the RA preamble #k and data to the base station in a preamble reservation period associated with the RA preamble #k.