Random Access Characteristic Identity Detection in NTN

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Solution Overview

Problem

Current wireless communication systems, particularly in Non-Terrestrial Networks (NTN), face challenges with large propagation delay differences due to the longer distances involved, leading to inefficiencies in random access procedures and synchronization, as existing LTE and 5G NR systems are not designed to handle such delays effectively.

Innovation Solution

A method and device for wireless communications that involve blind detection of characteristic identities in time and frequency resources, allowing for successful random access and uplink synchronization in NTN by adjusting time windows and resource allocations based on satellite or aircraft positioning, enabling the determination of correct Timing Advances and reducing complexity in blind detection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If existing LTE or 5G NR random access procedures are used in NTN, then the system can support conventional terrestrial communications, but it fails to handle large propagation delay differences effectively

Engineering Contradiction:

Improveadaptability to large propagation delayVSAvoidrandom access success rate

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent applies preliminary action by pre-configuring multiple characteristic identities (M identities) at the UE before random access. The UE performs blind detection on these pre-configured identities to determine the correct RNTI, eliminating the need for multiple random access attempts and thereby handling large propagation delays effectively while maintaining reliability.

Inventive Principle:

Principle #10Preliminary action

2Measurement precision

If the UE performs blind detection on all possible RNTIs, then the correct RNTI can be found, but the detection complexity increases significantly

Engineering Contradiction:

ImproveRNTI detection accuracyVSAvoidblind detection complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent segments the RNTI identification space by dividing all possible RNTIs into M characteristic identities that are pre-configured and notified to the UE. This segmentation allows the UE to perform blind detection only on these M identities rather than all possible RNTIs, reducing detection complexity while maintaining accurate RNTI identification.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The network performs preliminary action by pre-calculating and notifying the UE of M characteristic identities before random access. This pre-computation eliminates the need for the UE to perform exhaustive blind detection on all possible RNTIs, significantly reducing device complexity while ensuring accurate RNTI detection.

Inventive Principle:

Principle #10Preliminary action

3Reliability

If the time window for monitoring first-type signaling is extended to accommodate large propagation delays, then random access can succeed in NTN, but the time resource occupation increases

Engineering Contradiction:

Improverandom access success in large delayVSAvoidtime window duration

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies preliminary action by pre-configuring the time window parameters and M characteristic identities before random access. The UE uses these pre-configured parameters to determine the appropriate time window for monitoring first-type signaling, ensuring the window is sufficiently long to accommodate large propagation delays while avoiding excessive time occupation through optimized parameter selection.

Inventive Principle:

Principle #10Preliminary action

4Device complexity

If multiple characteristic identities are pre-configured and notified to the UE, then the correct RNTI can be determined with reduced blind detection, but the initial configuration overhead increases

Engineering Contradiction:

Improveblind detection complexityVSAvoidconfiguration information volume

Core Design Contradiction:

Device complexityVSQuantity of substance

Solution Approach 1:

The patent changes the parameter of identity quantity by using M characteristic identities instead of all possible RNTIs. While this increases the configuration information volume slightly, the value of M is optimized to be much smaller than the total number of possible RNTIs, thereby significantly reducing blind detection complexity while keeping configuration overhead manageable.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS11909520B2Method and device in communication nodes used for random access in wireless communications

Publication Date: 2024.02.20 HONOR DEVICE CO LTD

AI summary

A communication node receives first information, transmits a first radio signal and monitors a first-type signaling in a first time window; an end time for a transmission of the first radio signal is used for determining a start of the first time window, a time-domain resource occupied by the first radio signal is used for determining a first characteristic identity; the first characteristic identity is one of M characteristic identities, the M is a positive integer greater than 1, and the first information is used for determining the M characteristic identities; the first-type signaling carries one of the M characteristic identities, the communication node determines a characteristic identity carried by the first-type signaling out of the M characteristic identities through blind detection. The method helps improve random access performance.