RACH Small Data Transmission Without RRC Connection Setup
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently transmitting small data without transitioning to an RRC connected state, particularly in poor channel environments with high path-loss, phase-noise, and frequency offset, which are prevalent in high carrier frequencies.
Innovation Solution
A method and apparatus for transmitting small data through a random access channel (RACH) procedure, utilizing both contention-based and contention-free random access (CBRA and CFRA) mechanisms, with resource allocation based on common control channel (CCCH) and transport block size (TBS) comparison, and additional PRACH configuration for efficient data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the UE transmits small data through conventional RACH procedures, then the data can be transmitted, but the signaling overhead and power consumption increase
Solution Approach 1:
The patent merges the small data transmission with the RACH procedure by allowing the UE to include small data in the Msg3 transmission during the random access process. This combining of data transmission with the existing connection establishment procedure eliminates the need for separate data transmission steps, thereby reducing signaling overhead and power consumption while maintaining transmission efficiency
Solution Approach 2:
The RACH procedure is enhanced to serve multiple functions simultaneously: establishing the connection and transmitting small data. By making the RACH procedure multi-functional, the system avoids the overhead of dedicated small data transmission mechanisms while still achieving efficient data delivery
2Loss of energy
If the UE shifts to RRC connected state for data transmission, then reliable data transmission is achieved, but power consumption and signaling overhead increase
Solution Approach 1:
Instead of transitioning to the full RRC connected state, the patent enables the UE to transmit small data during the RACH procedure in a partial connection state. This partial action approach provides sufficient reliability for small data transmission without incurring the complete overhead and power consumption of a full RRC connected state transition
3Adaptability or versatility
If additional PRACH configuration is added for small data transmission, then resource allocation flexibility improves, but device complexity increases
Solution Approach 1:
The patent introduces dynamic resource allocation for small data transmission within the RACH procedure. The gNB can dynamically allocate uplink resources for small data in Msg3 based on current network conditions and UE requirements, providing flexibility without requiring complex static configuration. This dynamic approach adapts to varying traffic patterns while keeping configuration complexity manageable
Data Source
AI summary
The present disclosure may provide a method of transmitting, by a user equipment (UE), small data in a wireless communication system. Here, a small data transmission method may include enabling a small data configuration in a UE; triggering, by the UE, a small data transmission; transmitting, by the UE, a common control channel (CCCH) and buffered data information to a base station in a random access channel (RACH) procedure; receiving a random access response (RAR) including an uplink (UL) grant from the base station based on the buffered data information; and transmitting the small data based on the UL grant.