Emergency Access Signaling for RedCap Base Station Admission

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Solution Overview

Problem

Existing cellular communication systems deny emergency-service access requests from reduced capability (RedCap) devices based on their number of receive chains without confirming the emergency nature of the request, violating FCC guidelines and 3GPP standards.

Innovation Solution

Implementing a method where RedCap devices provide a first indication of emergency-service access request and a second indication of the number of receive branches in messages like random access preamble (MSG1) or RRCSetupRequest (MSG3), allowing base stations to grant or deny access while complying with FCC and 3GPP standards.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the network rejects emergency-related network access requests based on the number of antennas or receive chains, then network resource allocation is optimized for full capability devices, but emergency service access is denied to reduced capability devices

Engineering Contradiction:

Improveemergency service access reliabilityVSAvoidreceive chains requirement

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The base station is configured to obtain information about the type of network access request before making access decisions. This preliminary information gathering allows the network to distinguish between emergency and non-emergency requests, ensuring that emergency requests are not rejected based on device capability limitations. The system performs this classification early in the access process to prevent premature rejection of critical emergency communications.

Inventive Principle:

Principle #10Preliminary action

2Adaptability or versatility

If the network grants emergency access to reduced capability devices, then emergency service accessibility is improved, but network resource allocation efficiency may be reduced

Engineering Contradiction:

Improveemergency service access compatibilityVSAvoidnetwork resource allocation efficiency

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The network applies different access criteria and resource allocation strategies based on the type of network access request. Emergency requests receive prioritized treatment with relaxed capability requirements, while non-emergency requests follow standard resource allocation procedures. This localized quality adjustment ensures that emergency services maintain high accessibility without compromising overall network efficiency, as each request type is handled according to its specific needs.

Inventive Principle:

Principle #3Local quality

Data Source

PatentEP4124167B1Systems and methods for emergency service access by reduced capability radio frequency devices

Publication Date: 2025.11.05 APPLE INC

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AI summary

An electronic device may transmit a communication request to a base station having an indication of a number of its receive branches and an indication of whether the communication request is designated as an urgent service fulfillment. The base station may delay a denial of the communication request until receiving the indication of whether the communication request is designated as using the urgent service fulfillment to reduce a likelihood of prematurely rejecting the communication request. The base station may also handover the communication request to a base station that supports the urgent service fulfillment. The base station may also be barred from transferring the user equipment to a frequency layer preferred by the base station when the communication request of the user equipment is designated as an urgent service fulfillment.