Differentiated RACH Resource Configuration for IAB Nodes
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Solution Overview
Problem
In integrated access and backhaul communication systems, especially in 5G networks, there is a challenge in efficiently managing random access configurations for both user equipment (UEs) and IAB nodes, particularly when backhaul links are blocked, leading to difficulties in maintaining connection and resource allocation.
Innovation Solution
Configuring distinct random access channel (RACH) resources for IAB nodes and UEs, with different preamble formats, time, frequency configurations, and orthogonal multiplexing, to differentiate between access and backhaul link communications, enabling efficient use of backhaul links and reducing collision probabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If shared RACH resources are used for both UEs and IAB nodes, then resource utilization is improved, but collision probability increases and connection reliability deteriorates when backhaul links are blocked
Solution Approach 1:
The patent segments the shared RACH resources into distinct access and backhaul link portions by configuring different preamble formats, time resources, and frequency resources. UE access links use one set of RACH parameters while IAB backhaul links use another set, allowing simultaneous operation without collision. This segmentation resolves the contradiction by maintaining high resource utilization through structured sharing while ensuring connection reliability through differentiated access mechanisms.
Solution Approach 2:
The patent applies local quality by assigning specific RACH configurations to specific link types. Each RACH resource is locally optimized for its intended purpose: UE access RACH resources are configured for user equipment connectivity, while IAB backhaul RACH resources are configured for integrated access and backhaul node connectivity. This localized differentiation eliminates collisions while maintaining overall system efficiency.
2Reliability
If differentiated RACH configurations are used for IAB nodes and UEs, then collision probability is reduced and connection reliability is improved, but device complexity and configuration overhead increase
Solution Approach 1:
The patent implements universality by using a single RACH configuration mechanism that serves multiple purposes. The same RACH resource pool is used for both UE access and IAB backhaul links, but with different parameter sets. This multi-functional approach reduces device complexity compared to having completely separate RACH systems, while still providing differentiated configurations for reliability.
Solution Approach 2:
The patent manages configuration complexity by changing key RACH parameters (preamble format, time resources, frequency resources) rather than creating entirely separate systems. These parameter changes enable differentiated access for IAB nodes and UEs while maintaining a unified RACH framework, thus improving connection reliability without excessive complexity increase.
3Reliability
If backhaul link RACH resources are prioritized when backhaul is blocked, then connection maintenance for IAB nodes is improved, but access link resource availability for UEs may be affected
Solution Approach 1:
The patent implements periodic action through configured periodic RACH opportunities for both access and backhaul links. When backhaul links are blocked, IAB nodes can periodically attempt reconnection using their dedicated backhaul RACH resources without impacting UE access resources. This periodic mechanism ensures backhaul connection maintenance while preserving access link productivity through separate resource pools.
Solution Approach 2:
The patent segments RACH resources into distinct access and backhaul portions with separate parameter sets and resource pools. This segmentation allows prioritized allocation where backhaul RACH resources can be dedicated for IAB node connectivity maintenance, while access RACH resources remain available for UE communications, eliminating the trade-off between backhaul reliability and access productivity.
Data Source
AI summary
An integrated access and backhaul, IAB, wireless communication system comprises a first base station, a second base station, and a plurality of remote wireless communication units, wherein the second base station provides access to a core network, and the first base station requires access to the core network via the second base station. The second base station includes: a transceiver; and a processor, operably coupled to the transceiver and arranged to: configure a first random access channel, RACH, resource for use by the first base station; and configure a second random access channel, RACH, resource for use by the plurality of remote wireless communication units to access the second base station, wherein the configured second RACH is different to the configured first RACH. Also disclosed is Disclosed is a method of configuring a positioning reference signal in a telecommunication system comprising transmitting the positioning reference signal multiplexed with another signal.