Relay Node Parent Switching via Beam Indication
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Solution Overview
Problem
In next-generation communications systems, the introduction of relay nodes to improve coverage and stability leads to communication interruptions when the parent node cannot directly communicate with the base station, causing disruptions to child nodes or terminals.
Innovation Solution
A method to switch the parent-child relationship between relay nodes by sending indication information that the downlink beam is the same as or similar to the uplink beam, eliminating the need for additional beam search or training, and synchronizing timing through time difference notifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If relay nodes are introduced to improve coverage and stability, then system stability and throughput are improved, but communication interruptions occur when parent nodes cannot directly communicate with base stations
Solution Approach 1:
The patent performs preliminary beam search and training before parent-child relationship switching occurs. The child node proactively searches for and trains with potential new parent nodes in advance, so that when switching is needed, the new parent relationship is already established and ready, avoiding communication interruptions.
Solution Approach 2:
The patent uses indication information as an intermediary to convey beam correspondence relationships between nodes. This indication information acts as a mediator that allows the child node to understand the beam relationship with the new parent node without requiring extensive additional training, thus maintaining communication continuity during switching.
2Measurement precision
If additional beam search or training is performed during parent-child switching, then beam alignment accuracy is improved, but communication interruptions and switching time increase
Solution Approach 1:
Beam search and training are performed in advance before switching is required. The child node proactively establishes beam relationships with potential parent nodes beforehand, so that when switching occurs, the beam alignment is already accurate and no additional time-consuming search is needed during the actual switching event.
Solution Approach 2:
The patent uses beam correspondence relationships as a form of copying - the child node can infer or copy beam information from indication messages received from the new parent node, rather than performing complete beam search from scratch. This reduces the time and complexity of beam alignment during switching.
3Measurement precision
If beam correspondence information is conveyed through detailed signaling, then beam alignment accuracy is improved, but signaling overhead and system complexity increase
Solution Approach 1:
The patent extracts only the essential beam correspondence information from the full beam training process and conveys it through compact indication messages. Instead of transmitting complete beam training sequences, only the critical relationship indicators are signaled, reducing overhead while maintaining sufficient accuracy for beam alignment.
Solution Approach 2:
The patent changes the representation parameters of beam information from detailed multi-dimensional beam training data to simplified indication information that captures the essential beam correspondence relationship. This parameter transformation reduces signaling overhead while preserving the necessary information for accurate beam alignment.
Data Source
AI summary
Various embodiments provide a relay transmission method, where a first node is a parent node of a second node. In those embodiments, a request message from the first node can be received by the second node, where the request message is configured to request the second node to become a parent node of the first node. Still in those embodiments, indication information can be sent, by the second node, to the first node, where the indication information is used to indicate that a downlink beam sent from the second node to the first node after the second node becomes the parent node is the same as or similar to an uplink beam sent from the second node to the first node when the first node is the parent node. The indication information may be carried in a response message for the request message.