Early Data Transmission Signaling in Random Access Procedures

Solution Overview

Problem

Existing wireless communication systems face challenges in reducing power consumption and data latency, particularly during random access procedures, due to control signaling overhead and limitations in early data transmission (EDT) capabilities.

Innovation Solution

A wireless device transmits signaling indicating its capability to receive user data during a random access procedure, allowing the network to aware of this capability and transmit user data accordingly, thereby optimizing resource usage and reducing overhead.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of time

If early data transmission is enabled during random access procedure, then power consumption is reduced and data latency is reduced, but control signaling overhead increases

Engineering Contradiction:

Improvedata latencyVSAvoidcontrol signaling overhead

Core Design Contradiction:

Loss of timeVSLoss of information

Solution Approach 1:

The wireless device transmits capability signaling in advance during the random access procedure (in Msg3 or Msg5) to indicate whether it supports early data transmission. This preliminary indication allows the network to prepare and transmit downlink data in the same random access messages, enabling early data transmission and reducing latency without requiring additional control signaling exchanges.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent combines capability signaling with existing random access messages (RRC connection request, RRC connection setup, or RRC connection resume). By embedding the EDT capability indication within these mandatory messages rather than using separate dedicated signaling, the patent reduces control signaling overhead while still conveying the necessary information for early data transmission.

Inventive Principle:

Principle #5Merging (Combining)

2Use of energy by moving object

If early data transmission is enabled during random access procedure, then power consumption is reduced, but control signaling overhead increases

Engineering Contradiction:

Improvepower consumptionVSAvoidcontrol signaling overhead

Core Design Contradiction:

Use of energy by moving objectVSLoss of information

Solution Approach 1:

The wireless device transmits capability signaling in advance during the random access procedure (in Msg3 or Msg5) to indicate whether it supports early data transmission. This preliminary indication allows the network to prepare and transmit downlink data in the same random access messages, enabling early data transmission and reducing latency without requiring additional control signaling exchanges.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent combines capability signaling with existing random access messages (RRC connection request, RRC connection setup, or RRC connection resume). By embedding the EDT capability indication within these mandatory messages rather than using separate dedicated signaling, the patent reduces control signaling overhead while still conveying the necessary information for early data transmission.

Inventive Principle:

Principle #5Merging (Combining)

3Loss of time

If the network transmits user data during random access procedure, then data latency is reduced, but radio resources may be wasted if device is incapable

Engineering Contradiction:

Improvedata latencyVSAvoidresource allocation reliability

Core Design Contradiction:

Loss of timeVSReliability

Solution Approach 1:

The wireless device transmits capability signaling in advance during the random access procedure (in Msg3 or Msg5) to indicate whether it supports early data transmission. This preliminary indication allows the network to prepare and transmit downlink data in the same random access messages, enabling early data transmission and reducing latency without requiring additional control signaling exchanges.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements a feedback mechanism where the wireless device provides capability information to the network during the random access procedure. This feedback loop ensures that the network has accurate information about the device's EDT capability before allocating resources, preventing wasted radio resources while enabling early data transmission when supported.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS20250089100A1Mobile-Terminated Early Data Transmission

Publication Date: 2025.03.13 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

A wireless device is configured for use in a wireless communication system. The wireless device is configured to transmit signaling indicating whether or not the wireless device is capable of receiving user data during a random access procedure. The signaling may for instance indicate whether or not the wireless device is capable of receiving user data over a user plane during a random access procedure, e.g., by indicating whether or not the wireless device supports early data for cellular internet of things, CIoT, Evolved Packet System, EPS, user plane (UP) optimization. Regardless, the wireless device may also receive user data during the random access procedure in accordance with said signaling.