Low Complexity UE Random Access via D2D Assistance

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Solution Overview

Problem

Low complexity user equipment (UEs) in wireless communications systems face inefficiencies in random access procedures due to reduced capabilities, leading to difficulties in establishing connections and maintaining network synchronization, especially when competing with higher-powered premium UEs.

Innovation Solution

Low complexity UEs leverage external assistance via device-to-device communications to request contention free random access (CFRA) resources, allowing them to receive configured CFRA resources from a network through a more capable UE, facilitating improved random access procedures.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If low complexity UEs perform contention-based random access (CBRA) procedures, then they can establish connection with the network, but the procedure latency increases and power consumption increases due to repeated access attempts

Engineering Contradiction:

Improvesuccessful random access procedureVSAvoidprocedure latency

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The network pre-configures dedicated CFRA resources (time, frequency, preamble) for low complexity UEs before they need to access the network. This preliminary preparation eliminates the need for repeated access attempts and reduces latency by providing immediate access resources when needed.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

A more capable UE acts as an intermediary to relay CFRA resource requests from low complexity UEs to the network. The intermediary UE receives the request, forwards it to the network, and relays the configured CFRA resources back to the low complexity UE, enabling successful access without direct complex communication between the low complexity UE and network.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If low complexity UEs perform contention-based random access (CBRA) procedures, then they can establish connection with the network, but the power consumption increases due to repeated access attempts

Engineering Contradiction:

Improvesuccessful random access procedureVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The network pre-configures dedicated CFRA resources for low complexity UEs before they need to access the network. This preliminary preparation eliminates the need for repeated access attempts and reduces power consumption by providing immediate access resources when needed.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

A more capable UE acts as an intermediary to relay CFRA resource requests from low complexity UEs to the network, reducing the power consumption of low complexity UEs by leveraging the higher power capabilities of the intermediary device.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Use of energy by moving object

If low complexity UEs use reduced transmission power to maintain power savings, then power consumption decreases, but the ability to compete with higher-powered premium UEs in random access deteriorates

Engineering Contradiction:

Improvepower consumptionVSAvoidrandom access success rate

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

A more capable UE with higher transmission power acts as an intermediary to relay CFRA resource requests and configurations. This allows low complexity UEs to maintain their power savings while the intermediary handles the power-intensive communication with the network.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The network provides dedicated CFRA resources configured specifically for low complexity UEs, allowing them to access the network using their reduced power capabilities without competing directly with premium UEs for shared resources.

Inventive Principle:

Principle #25Self-service

Data Source

PatentEP4059289B1Random access channel procedures with external assistance

Publication Date: 2024.11.13 QUALCOMM INC

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AI summary

A low complexity user equipment (UE) may be in communication with another UE (e.g., with a premium UE or more capable UE) via a device-to-device communication link (e.g., via sidelink), and the low complexity UE may leverage the device-to-device link to improve (e.g., simplify, expedite, etc. ) random access procedures performed by the low complexity UE. For example, a low complexity UE may request contention free random access (CFRA) resources via the device-to-device link with another UE. Another device (e.g., another UE in device-to-device communication with the low complexity UE) may receive the request from the low complexity UE and forward the request to the network (e.g., to a base station). The network may then configure CFRA resources for the low complexity UE. Upon receiving the CFRA configuration, the low complexity UE may perform a random access procedure (e.g., a CFRA procedure) with the network (e.g., with the base station) accordingly.