Mobile-terminated early data transmission paging mechanism

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Solution Overview

Problem

Current 3GPP Release 15 solutions for mobile-originated early data transmission (EDT) cannot be directly applied to mobile-terminated EDT, as they rely on uplink data presence, differ in Msg2 and Msg3 content, and result in preamble collision, unnecessary padding, and inefficient resource use.

Innovation Solution

Modifying the downlink data notification procedure to include information about the amount of downlink data, allowing the network to initiate MT EDT, and providing a new transport block size for efficient data transmission in Msg3, while enabling quick release of RRC connections when no more data is needed.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If mobile-originated EDT solutions from 3GPP Release 15 are applied to mobile-terminated EDT, then early data transmission capability is achieved, but preamble collision occurs and resource efficiency deteriorates

Engineering Contradiction:

Improveearly data transmission capabilityVSAvoidpreamble collision

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent segments the random access preamble space by introducing a specific indicator bit in Msg3 that distinguishes MT-EDT scenarios from MO-EDT scenarios. This segmentation allows the network to correctly identify and handle MT-EDT requests without confusing them with MO-EDT requests, thereby preventing preamble collision while maintaining early data transmission capability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent changes the parameter structure of Msg3 by adding an indicator bit that specifies whether the UE is resuming an RRC connection or initiating a new one. This parameter change enables the network to differentiate between MT-EDT and MO-EDT procedures, resolving the preamble collision issue while preserving the productivity gain from early data transmission.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If mobile-originated EDT procedures are used for mobile-terminated EDT, then data transmission is enabled, but unnecessary padding is introduced and resource efficiency decreases

Engineering Contradiction:

Improvedata transmission capabilityVSAvoidunnecessary padding

Core Design Contradiction:

ProductivityVSLoss of substance

Solution Approach 1:

The patent inverts the traditional EDT initiation approach by allowing the network to initiate MT-EDT based on downlink data arrival, rather than requiring the UE to initiate based on uplink data. This inversion eliminates the need for UE to pad Msg3 with dummy uplink data, thereby reducing unnecessary padding loss while maintaining data transmission capability.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent employs disposable RRC connection resumption for MT-EDT scenarios where the connection is quickly established for data reception and then released. This approach avoids the overhead of maintaining persistent connections and eliminates unnecessary padding that would be required if UEs attempted to initiate EDT without actual uplink data.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Reliability

If conventional RRC connection management is used for MT-EDT, then connection reliability is maintained, but idle mode duration is reduced and power consumption increases

Engineering Contradiction:

Improveconnection reliabilityVSAvoididle mode duration

Core Design Contradiction:

ReliabilityVSDuration of action of moving object

Solution Approach 1:

The patent applies preliminary action by having the network pre-indicate its intention to transmit downlink data via paging before the actual data transmission. This allows the UE to prepare for MT-EDT by resuming its RRC connection in advance, ensuring connection reliability is maintained while extending the effective idle mode duration by avoiding premature connection establishment.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent enables self-service by allowing the network to autonomously manage the RRC connection state based on downlink data arrival. The network can independently decide when to page the UE for MT-EDT and when to release the connection after data transmission, maintaining reliability while optimizing idle mode duration and reducing unnecessary power consumption from prolonged connected states.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS11917695B2Early mobile-terminated data transmission

Publication Date: 2024.02.27 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

According to some embodiments, a method performed by a wireless device for mobile-terminated early data transmission includes receiving a paging message from a network node. The paging message comprises an indication that the network node will use early data transmission to transmit downlink data to the wireless device. In response to receiving the paging message, the method includes selecting an early data transmission preamble and transmitting a random access message 1 to the network node. The message 1 includes the selected early data transmission preamble.