RNTI Calculation by Decoupling Time and Frequency Resources

Solution Overview

Problem

Existing wireless communication systems face challenges in efficiently determining and managing radio network temporary identifiers (RNTIs) due to their dependence on complex formulas that include both time and frequency domain resources, leading to potential overflow and inefficiencies in resource allocation.

Innovation Solution

Decoupling the time and frequency domain resources in the calculation of RNTIs, allowing separate indication of these resources through DCI and RAR, thereby reducing the range of RNTI values and enhancing resource management efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If complex formulas including both time and frequency domain resources are used to calculate RNTI, then the RNTI can identify more PRACH occasions, but the RNTI values may overflow and resource allocation becomes less efficient

Engineering Contradiction:

ImproveRNTI coverage rangeVSAvoidformula complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent segments the RNTI calculation by separating time domain resources (s_id, t_id) from frequency domain resources (f_id). The time domain parameters are used to calculate the base RNTI value, while frequency domain parameters are handled separately through indication fields in DCI and RAR messages. This segmentation prevents overflow by bounding the RNTI calculation to manageable ranges while maintaining the ability to identify multiple PRACH occasions through combined time-frequency resource indication.

Inventive Principle:

Principle #1Segmentation

2Adaptability or versatility

If complex formulas including both time and frequency domain resources are used to calculate RNTI, then the RNTI can identify more PRACH occasions, but resource allocation efficiency decreases

Engineering Contradiction:

ImproveRNTI coverage rangeVSAvoidresource allocation efficiency

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The patent segments the RNTI calculation by separating time domain resources (s_id, t_id) from frequency domain resources (f_id). The time domain parameters are used to calculate the base RNTI value, while frequency domain parameters are handled separately through indication fields in DCI and RAR messages. This segmentation prevents overflow by bounding the RNTI calculation to manageable ranges while maintaining the ability to identify multiple PRACH occasions through combined time-frequency resource indication.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent extracts the frequency domain resource indication (f_id) from the RNTI calculation formula and handles it separately through indication fields in DCI and RAR messages. This extraction allows the RNTI to be calculated using only time domain parameters, ensuring bounded values and efficient resource allocation, while the frequency domain information is conveyed through dedicated indication mechanisms.

Inventive Principle:

Principle #2Taking out (Extraction)

3Reliability

If time and frequency domain resources are coupled in RNTI calculation, then comprehensive resource identification is achieved, but the random access procedure complexity increases

Engineering Contradiction:

Improveresource identification accuracyVSAvoidrandom access procedure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent segments the RNTI calculation by separating time domain resources (s_id, t_id) from frequency domain resources (f_id). The time domain parameters are used to calculate the base RNTI value, while frequency domain parameters are handled separately through indication fields in DCI and RAR messages. This segmentation prevents overflow by bounding the RNTI calculation to manageable ranges while maintaining the ability to identify multiple PRACH occasions through combined time-frequency resource indication.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent extracts the frequency domain resource indication (f_id) from the RNTI calculation formula and handles it separately through indication fields in DCI and RAR messages. This extraction allows the RNTI to be calculated using only time domain parameters, ensuring bounded values and efficient resource allocation, while the frequency domain information is conveyed through dedicated indication mechanisms.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentEP4066569B1Method and apparatus related to radio network temporary identifier

Publication Date: 2026.04.15 ZTE CORP

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AI summary

Presented are systems and methods for radio network temporary identifier (RNTI). A wireless communication device may determine a RNTI. The wireless communication device may determine that a cyclic redundancy check (CRC) of a downlink control information (DCI) format is scrambled with the RNTI.