IAB Node Initial Access via Segmented Random Access Resources
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Solution Overview
Problem
In next-generation wireless communication systems, particularly in integrated access and backhaul (IAB) environments, there is a need for an efficient initial access method that allows IAB nodes to differentiate between relay nodes and terminal devices to provide appropriate services, as existing methods lack the capability to accurately identify device types during the initial access process.
Innovation Solution
The proposed method involves IAB nodes receiving synchronization signals and system information from a parent node through allocated resources, performing a random access process using resources determined based on whether they are relay nodes or terminal devices, and transmitting random access preambles and messages with distinct scrambling sequence identities and indication fields to identify their type.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If IAB nodes use the same random access resources as terminal devices, then the initial access process is simplified, but the system cannot accurately identify device types
Solution Approach 1:
The patent segments the random access resources by creating separate resource pools for relay nodes and terminal devices. This segmentation allows the system to maintain simple access procedures while enabling accurate device type identification through resource pool selection
Solution Approach 2:
The patent applies local quality by assigning different resource characteristics to different device types. Relay nodes use specific random access preamble sequences and resource configurations that differ from terminal devices, enabling local differentiation while maintaining overall system simplicity
2Ease of operation
If IAB nodes transmit random access preambles using terminal device resources, then the access process is straightforward, but relay nodes cannot be distinguished from terminal devices
Solution Approach 1:
The patent implements preliminary action by having relay nodes pre-configure and select from dedicated random access resource pools before initiating the access process. This preliminary configuration ensures that relay nodes are distinguished from terminal devices from the very beginning of the access procedure, maintaining both simplicity and reliability
3Device complexity
If the system provides unified random access resources for all devices, then resource management is simplified, but service differentiation between relay nodes and terminal devices is lost
Solution Approach 1:
The patent achieves universality by creating a unified random access framework that serves both relay nodes and terminal devices through a common procedure structure. Within this universal framework, different resource pools enable multi-functionality, allowing the system to provide differentiated services while maintaining manageable complexity
Data Source
AI summary
An initial access method of an integrated access and backhaul (IAB) node in a wireless communication system and an apparatus using the method are provided. The method includes: receiving, from a parent node, a synchronization signal block (SSB) and system information; and performing a random access procedure with the parent node on the basis of the SSB and the system information, wherein the SSB and the system information are received through a resource allocated to an access link of the parent node, and the random access step is performed through a resource allocated to the backhaul link of the parent node, and the random access step is performed using resources determined differently depending on whether the TAB node is a relay node or a terminal.