Wireless Device Proactive Restriction Indication in LTE

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Solution Overview

Problem

Low complexity User Equipments (UEs) in LTE networks face communication failures due to unindicated restrictions, such as Transport Block Size limitations, leading to excessive uplink grants that exceed their capabilities, causing resource wastage and potential communication failures.

Innovation Solution

The UE proactively populates existing messages with indications of its restrictions, such as Transport Block Size limitations, before the network node enquires about its capabilities, allowing the network to adjust grants accordingly and prevent communication failures without increasing latency or coverage impact.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the UE waits for network enquiry to provide capability information, then the network procedure follows standard sequence, but the network may allocate excessive grants causing communication failures

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidcapability indication delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The UE performs preliminary action by proactively indicating its capability restrictions in Msg3 before the network has a chance to enquiry or allocate resources. This allows the network to know the UE's TBS limitations in advance and adjust grants accordingly, preventing communication failures while maintaining standard procedure timing

Inventive Principle:

Principle #10Preliminary action

2Loss of information

If the UE uses additional messages to indicate restrictions, then the network receives complete capability information, but the message overhead and latency increase

Engineering Contradiction:

Improvecapability information completenessVSAvoidmessage overhead

Core Design Contradiction:

Loss of informationVSQuantity of substance

Solution Approach 1:

The UE merges the capability restriction indication with the existing Msg3 message that is already part of the random access procedure. By combining the restriction indication with the mandatory uplink transmission, the network receives complete capability information without requiring additional separate messages, thus avoiding increased overhead and latency

Inventive Principle:

Principle #5Merging (Combining)

3Productivity

If the network allocates grants based on maximum capability, then resource utilization is optimized, but low complexity UEs receive excessive grants they cannot handle

Engineering Contradiction:

Improvenetwork resource utilizationVSAvoidgrant execution reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The UE provides feedback about its actual capability restrictions to the network through Msg3. The network uses this feedback information to adjust and customize grants that match the UE's true capabilities rather than assuming maximum capability, ensuring both efficient resource utilization and reliable grant execution

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS10182343B2Wireless device, network node, and methods therein for sending a message comprising one or more populated fields

Publication Date: 2019.01.15 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

A method performed by a wireless device for sending a message comprising one or more populated fields to a network node. The wireless device and the network node operate in a wireless communications network. The wireless device populates one or more fields comprised in an existing message to be sent to the network node with an indication of a restriction of the wireless device. The wireless device also sends the message comprising the one or more populated fields to the network node prior to an enquiry or a fetching of category and capability information of the wireless device by the network node.