Relay Node Initial Access via Preamble Segmentation
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Solution Overview
Problem
In wireless communication systems that utilize relay nodes, there is confusion during the initial access procedure when user agents (UAs) attempt to connect to the network, as signals can be received by both access nodes and relay nodes, leading to unclear communication links and potential misinterpretation of connection requests.
Innovation Solution
The proposed solution involves two methods: first, the UA connects to an access node and requests handover to a relay node with better signal reception, and second, the UA directly attaches to a relay node using specific preamble sets to avoid confusion, with the access node ignoring certain preambles intended for the relay node and vice versa.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UA transmits access signals that can be received by both access nodes and relay nodes, then the UA can potentially connect to nodes with better signal reception, but confusion arises during initial access leading to unclear communication links
Solution Approach 1:
The patent segments the random access preambles into two distinct groups: first group preambles for accessing access nodes and second group preambles for accessing relay nodes. This segmentation eliminates confusion by ensuring that when a UA transmits a preamble, the receiving node can immediately identify whether the UA intends to connect to an access node or a relay node based on which group the preamble belongs to, thereby resolving the contradiction between connection reliability and connection intent clarity
Solution Approach 2:
The patent applies local quality by assigning different properties (preamble groups) to different access scenarios. Access nodes are configured to receive and process first group preambles, while relay nodes are configured to receive and process second group preambles. This localized differentiation ensures that each node type handles only the preambles intended for it, eliminating interference and confusion during initial access
2Use of energy by moving object
If the UA directly attaches to a relay node, then battery efficiency improves by connecting to the nearest node, but the access node may still receive the signal causing interference and confusion
Solution Approach 1:
The patent segments preambles into distinct groups that are recognized only by specific node types. When a UA wants to directly attach to a relay node for better battery efficiency, it transmits a second group preamble that the relay node can process but the access node will ignore. This segmentation allows direct relay attachment without causing interference to access nodes, resolving the contradiction between energy efficiency and signal interference
Solution Approach 2:
The patent introduces preamble group classification as an intermediary mechanism that mediates between the UA's intention to attach to a relay node and the access node's need to avoid processing irrelevant signals. The access node is configured to ignore second group preambles, acting as a filter that prevents it from generating harmful interference while allowing the UA to efficiently attach to the relay node
Data Source
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AI summary
A user agent (UA) in a wireless communication system. The UA is configured to transmit a preamble on a random access channel (RACH) to an access node in order to attach to the access node. The UA transmits a message to the access node, wherein the message contains an identity of one or more relay nodes to which the UA can be transferred. The UA requests the access node to hand-over the UA to one relay node of the one or more relay nodes.