Initial Uplink Bandwidth Configuration for RedCap Random Access

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Solution Overview

Problem

RedCap UEs, with limited capabilities, face challenges in initial access procedures due to exceeding the maximum operating bandwidth of the initial uplink bandwidth part, affecting the reliability of the random access procedure in NR systems.

Innovation Solution

Configuring a smaller initial uplink bandwidth part for RedCap UEs by determining a first initial uplink bandwidth part and a second initial uplink bandwidth part with a reduced bandwidth, ensuring the RedCap UEs can transmit random access preambles within their operational limits.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a standard initial uplink bandwidth part is configured for RedCap UEs, then the system maintains uniform bandwidth configuration for all UEs, but the RedCap UEs cannot operate normally due to exceeding their maximum operating bandwidth

Engineering Contradiction:

Improvebandwidth configuration adaptabilityVSAvoidbandwidth configuration complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent applies local quality by configuring different bandwidth parameters for different UE types. Specifically, it sets the initial uplink bandwidth part to 100 resource blocks for RedCap UEs (first type) and 250 resource blocks for normal UEs (second type), allowing each UE type to operate within its capability while maintaining system-wide configuration flexibility

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent changes the bandwidth parameter based on UE type identification. When the UE type indicator indicates a first type (RedCap), the bandwidth is set to 100 resource blocks; when it indicates a second type (normal), the bandwidth is set to 250 resource blocks. This dynamic parameter adjustment resolves the contradiction between adaptability and complexity

Inventive Principle:

Principle #35Parameter changes

2Productivity

If the initial uplink bandwidth part exceeds the maximum operating bandwidth of RedCap UEs, then the network can allocate sufficient resources for high-performance UEs, but the RedCap UEs cannot transmit random access preambles successfully

Engineering Contradiction:

Improveresource allocation efficiencyVSAvoidinitial access reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent segments the bandwidth allocation by creating distinct bandwidth configurations for different UE types. It divides the uplink bandwidth into a first initial uplink bandwidth part (100 resource blocks) for RedCap UEs and a second initial uplink bandwidth part (250 resource blocks) for normal UEs, ensuring each segment is appropriate for its target UE type

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies partial action by allocating only the necessary bandwidth for RedCap UEs (100 resource blocks) rather than the full bandwidth available (250 resource blocks). This partial allocation ensures RedCap UEs can successfully transmit random access preambles while still allowing sufficient resources to remain available for high-performance UEs

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS12610400B2Bandwidth configuration method, transmission method, communication node, and storage medium

Publication Date: 2026.04.21 ZTE CORP

AI summary

Provided are a bandwidth configuration method, a transmission method, a communication node, and a storage medium. The bandwidth configuration method includes: determining a first initial uplink bandwidth part, where the first initial uplink bandwidth part includes a random access channel resource, the random access channel resource includes at least one random access channel occasion, and the at least one random access channel occasion is used for transmitting a random access preamble; and configuring a second initial uplink bandwidth part for a first type of user equipment (UE), where a bandwidth of the second initial uplink bandwidth part is smaller than a bandwidth of the first initial uplink bandwidth part.