Small Data Transmission on Non-SSB BWPs for Faster Random Access
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Solution Overview
Problem
Existing communication systems face poor transmission performance due to the inability to support small data transmission on bandwidth parts (BWPs) or configure BWPs without synchronization signals and PBCH blocks, leading to inefficiencies in random access and configured grant processes.
Innovation Solution
The method and apparatus enable small data transmission on a second BWP using non-cell defining synchronization signals (NCD-SSB) by configuring or not configuring random access (RA)-SDT, subsequent RA-SDT, and configured grant (CG)-SDT on a first BWP without synchronization signals and PBCH blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If small data transmission is performed on a BWP without SSB configuration, then transmission efficiency is improved, but system compatibility and reliability deteriorate
Solution Approach 1:
The patent segments the BWP configuration into two types: initial BWP with SSB for traditional access, and non-initial BWP without SSB for efficient small data transmission. This segmentation allows terminals to use different BWPs for different purposes, achieving both compatibility and efficiency.
Solution Approach 2:
The patent introduces dynamic BWP switching mechanisms where the network can configure and switch between different BWP types based on transmission needs. Terminals can dynamically adapt between SSB-based and non-SSB-based BWPs, making the system flexible and efficient.
2Productivity
If terminals retune for measurement and synchronization on BWP without SSB, then resource utilization is improved, but transmission delay and power consumption increase
Solution Approach 1:
The patent performs measurement and synchronization operations in advance on the initial BWP with SSB before switching to the non-initial BWP for data transmission. This preliminary action ensures that terminals are already synchronized when switching BWPs, avoiding additional retuning delays.
Solution Approach 2:
The initial BWP with SSB acts as an intermediary that provides measurement and synchronization services. Terminals use this intermediary BWP to prepare for subsequent data transmission on the non-initial BWP, reducing overall transmission delay.
3Measurement precision
If SDT is configured on initial BWP with SSB, then measurement accuracy is improved, but device complexity and configuration overhead increase
Solution Approach 1:
The patent extracts the measurement and synchronization functions from the data transmission BWP and places them on the initial BWP with SSB. This extraction allows the non-initial BWP to be used purely for efficient data transmission without SSB-related complexity.
Solution Approach 2:
The initial BWP with SSB serves multiple functions: it provides measurement, synchronization, and random access services. This multi-functionality reduces the need for separate dedicated BWPs for each function, simplifying overall system configuration.
Data Source
AI summary
This application discloses a small data transmission method and apparatus, a terminal, and a network side device. The small data transmission method in an embodiment of this application includes: A terminal performs a first operation associated with small data transmission SDT. The first operation includes at least one of the following: obtaining target information, where the target information is used for configuring, for the terminal on a first bandwidth part BWP, at least one of the following: random access RA-SDT, subsequent transmission of RA-SDT, configured grant CG-SDT, and subsequent transmission of CG-SDT; where the first BWP is an initial BWP configured with no synchronization signal and PBCH block SSB; and performing SDT on a second BWP based on a non-cell defining NCD-SSB.