PRACH Resource Configuration for IAB Node Collision Avoidance
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Solution Overview
Problem
In integrated access and backhaul networks, IAB nodes face challenges in configuring random access resources on access and backhaul links due to collisions, particularly when they support half-duplex operations, preventing simultaneous random access on both links.
Innovation Solution
A method where a network device adjusts the configured PRACH resource in slots or symbols based on received location adjustment information to determine a new PRACH resource, allowing time-staggered use of random access resources on both links, thereby avoiding collisions and satisfying half-duplex constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If random access resources are configured on both access link and backhaul link for IAB node, then the IAB node can provide access service and perform random access simultaneously, but resource collision occurs preventing half-duplex operation
Solution Approach 1:
The PRACH resource is segmented into multiple parts: a first part maintained at the original configured location for receiving random access requests from terminals, and a second part adjusted to a different time location for the IAB node's own random access on the backhaul link. This segmentation allows the IAB node to separately manage resources for access service provision and its own random access, avoiding resource collision while maintaining both functions.
Solution Approach 2:
The solution introduces a time dimension separation by adjusting the time location of the second part of the PRACH resource. By configuring different time locations for the first part (receiving requests) and second part (sending requests), the IAB node resolves the resource collision problem in the time domain, enabling half-duplex operation without sacrificing random access capability.
2Productivity
If PRACH resource location is adjusted to avoid collision, then resource utilization improves, but configuration complexity increases
Solution Approach 1:
The network device performs preliminary configuration by providing location adjustment information to the IAB node before the IAB node actually uses the PRACH resource. This advance configuration allows the IAB node to pre-calculate and prepare the adjusted time location for the second part of the PRACH resource, avoiding complex real-time calculations and reducing operational complexity while improving resource utilization.
Solution Approach 2:
Location adjustment information acts as an intermediary that conveys the necessary adjustment parameters from the network device to the IAB node. This intermediary mechanism simplifies the configuration process by providing explicit adjustment instructions rather than requiring the IAB node to independently determine optimal resource locations, thereby reducing configuration complexity while maintaining high resource utilization.
Data Source
AI summary
This present disclosure discloses example random access resource configuration methods, mediums, and apparatuses. One example method includes receiving, by a first network device, configuration information of a first physical random access channel (PRACH) resource. Location adjustment information is received by the first network device, where the location adjustment information is used to indicate to adjust a location of at least a part of the first PRACH resource. A second PRACH resource is determined by the first network device based on the configuration information of the first PRACH resource and the location adjustment information. A random access request is sent by the first network device to a second network device on the second PRACH resource.