Uplink Small Data Transmission Using Two-Step Random Access
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in transmitting small data packets, particularly in transitioning from idle or inactive modes to connected modes, leading to potential retransmissions and resource wastage.
Innovation Solution
A method for small data transmission involving a two-step or four-step random access procedure, transitioning to connected mode, determining resources, and segmenting data packets for efficient transmission, with retransmission on failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the system transitions from idle or inactive mode to connected mode for small data transmission, then the data can be transmitted reliably, but the transmission latency increases and network resources are wasted
Solution Approach 1:
The patent segments the random access procedure into two steps (MsgA and MsgB) instead of four steps, reducing the number of round-trip exchanges required. The small data transmission is integrated into MsgA along with the random access preamble, allowing simultaneous transmission of access request and data, thereby reducing latency while maintaining reliable delivery through the structured two-step process
Solution Approach 2:
The patent enables the UE to prepare and transmit small data packets in advance during idle or inactive states using pre-configured uplink resources. By having data ready before mode transition and utilizing pre-allocated resources, the system eliminates the need for full connected mode establishment, thus reducing latency while ensuring reliable transmission through the prepared resources
2Device complexity
If the system uses traditional random access procedures for small data transmission, then the protocol is simple and well-established, but resource efficiency deteriorates due to frequent mode transitions and retransmissions
Solution Approach 1:
The patent merges the random access procedure with small data transmission by integrating the data packet into MsgA of the two-step random access procedure. This combination allows the UE to transmit both the random access preamble and small data simultaneously using pre-configured uplink resources, eliminating the need for separate data transmission phases and reducing the frequency of mode transitions, thereby improving resource efficiency while maintaining protocol simplicity
Solution Approach 2:
The patent introduces dynamic resource allocation mechanisms where the network can configure and update uplink resources for small data transmission adaptively. The system dynamically adjusts the two-step random access parameters and resource configurations based on traffic conditions, allowing efficient resource utilization without requiring full connected mode, thus improving energy efficiency while maintaining manageable protocol complexity
3Ease of operation
If the system transmits small data packets without segmenting, then the transmission process is simpler, but resource efficiency worsens due to incomplete transmissions requiring retransmissions
Solution Approach 1:
The patent implements segmentation of small data packets into appropriate sizes that fit within the uplink resources allocated for the two-step random access procedure. By dividing data into manageable segments that can be transmitted in MsgA, the system avoids incomplete transmissions and reduces retransmissions, improving resource efficiency while maintaining operational simplicity through automated segment handling and clear transmission protocols
Data Source
AI summary
Methods for resource efficient data transmission are described herein. A method may comprise operating in one of an idle or an inactive mode and transmitting, in response to a random access (RA) message or a configured grant (CG), a small data transmission over an uplink channel. The RA message may be received in a two-step RA procedure or a four-step RA procedure. The method may further comprise transitioning from the idle or the inactive mode to a connected mode. The method may further comprise determining resources for transmitting the small data transmission. The method may comprise determining whether the small data transmission was successfully received and retransmitting, on a condition the small data transmission was not received, the small data transmission. The method may further comprise segmenting a small data packet into a plurality of small data packets and transmitting the small data packets in a plurality of transmission opportunities.