RACH Feature Combination Signalling for Low-Collision Partitioning
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Solution Overview
Problem
Existing RACH partitioning methods in 3GPP Rel-17 face inefficiencies and increased latency due to dedicated ROs or preambles per feature, leading to resource limitations and higher collision probabilities, which are exacerbated by the need to support multiple features.
Innovation Solution
Implement a method for efficient signaling of feature combinations using bitmaps and bit strings to indicate RA purposes and combinations, allowing flexible configuration of RACH resources across multiple features, with optional slicing and prioritization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dedicated ROs or preambles are assigned per feature in RACH partitioning, then each feature can be supported independently, but resource limitations occur and collision probabilities increase
Solution Approach 1:
The patent combines multiple RACH features (coverage enhancement, network slicing, RedCap, SDT) into unified RACH partitions rather than dedicating separate ROs/preambles to each feature. This merging approach increases resource utilization efficiency and reduces collision probabilities while maintaining support for all features through flexible configuration parameters.
Solution Approach 2:
The patent creates universal RACH partitions that can serve multiple features simultaneously through configurable parameters. Each partition can be dynamically assigned to different features based on access conditions, making the RACH structure multi-functional and adaptable to various service requirements without increasing overall resource consumption.
2Adaptability or versatility
If multiple features are supported with dedicated resources, then feature-specific requirements are met, but latency increases due to resource limitations
Solution Approach 1:
By merging multiple features into shared RACH partitions with flexible configuration, the patent eliminates the need for UEs to search through multiple dedicated partitions, thereby reducing access latency. The unified structure allows faster random access while maintaining feature-specific requirements through parameter configuration.
3Adaptability or versatility
If RACH resources are partitioned per feature, then feature isolation is achieved, but resource efficiency decreases and collisions increase
Solution Approach 1:
The patent implements universal RACH partitions that can be dynamically configured to serve different features based on access conditions. This multi-functional approach maintains feature isolation through configurable parameters while improving resource efficiency by allowing the same physical resources to be shared across multiple features, thereby reducing waste and collisions.
4Ease of operation
If dedicated preambles are used for each feature, then feature identification is simplified, but the number of available preambles is limited and collisions increase
Solution Approach 1:
The patent merges feature identification into the RACH configuration parameters rather than relying solely on dedicated preambles. This allows the network to identify features through configurable parameters associated with each partition, enabling the use of a larger pool of preambles across multiple features and reducing collision probabilities while maintaining identification capability.
Data Source
Figure 1(a)~1(b)
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AI summary
Systems, methods, apparatuses, and computer program products for efficiently signalling feature combinations for RACH partitioning. One method may include a network entity transmitting a radio resources configuration associated with at least one feature combination configuration and associated random access resources configuration. The at least one feature combination configuration is associated with at least one of coverage enhancement, network slicing, reduced capability user equipment, or small data transmission. The associated random access resources configuration is associated with access conditions for the at least one feature combination configuration.