Random Access Payload Modulation Coding 5G NR
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Solution Overview
Problem
In 5G NR systems, there is no established method for modulating and encoding payload parts in random access messages, leading to uncertainty in communication validity and reliability, especially in scenarios like mMTC where resource consumption and power efficiency are critical.
Innovation Solution
A method for terminal and network devices to perform modulation and coding on payload parts in random access messages according to a target Modulation and Coding Scheme (MCS), ensuring accurate transmission and reducing processing complexity at the network side.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cyclic prefix is added into the preamble to cancel out transmission delay influence, then communication reliability is improved, but transmission overhead and resource consumption increase
Solution Approach 1:
The patent applies partial action by selectively adding cyclic prefix only to specific parts of the random access message where needed, rather than adding it to the entire message structure. This selective approach maintains the necessary delay compensation for reliable communication while minimizing unnecessary transmission overhead in resource-constrained scenarios.
2Reliability
If uplink timing synchronization is acquired through random access process before data transmission, then communication reliability is improved, but resource consumption and power usage increase
Solution Approach 1:
The patent implements preliminary action by performing timing synchronization adjustments during the random access message transmission itself, rather than requiring a separate prior synchronization step. The timing advance information is obtained and applied as part of the random access process, enabling subsequent data transmission without additional synchronization overhead.
3Device complexity
If random access preamble is transmitted only on time-domain resource configured through PRACHConfigurationlndex, then device complexity is reduced, but adaptability and versatility decrease
Solution Approach 1:
The patent extends the random access preamble transmission from a single time-domain dimension to include both time-domain and frequency-domain resources. By configuring multiple PRACH occasions with different time-domain positions and associating them with different frequency resources, the system achieves greater adaptability without significantly increasing device complexity.
4Productivity
If payload part is transmitted simultaneously with preamble in MSG1 for 2-step RACH, then productivity is improved, but manufacturing precision and encoding reliability become uncertain
Solution Approach 1:
The patent addresses encoding precision by introducing specific parameter configurations for the payload part transmission, including modulation and coding scheme (MCS) selection, resource allocation parameters, and timing advance adjustments. These parameter changes enable reliable simultaneous transmission of preamble and payload while maintaining encoding precision.
Data Source
AI summary
Provided are a random access method, a terminal device and a network device. The random access method includes transmitting a random access message 1. A payload part is carried in the random access message 1, and the payload part is acquired through performing modulation and coding according to a target MCS.