Radio Access Network Node Identity Signaling for Interference Management
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Solution Overview
Problem
In 5G wireless communication networks, particularly in TDD systems, BS-to-BS interference due to atmospheric conditions poses challenges as the limited number of physical cell IDs leads to ambiguous identity determination, complicating interference management in large networks with numerous nodes.
Innovation Solution
A method is introduced to transmit an identity indication representing an identity from a set larger than physical cell identities, using a combination of information carried by multiple transmissions, reference signaling, and synchronisation signaling to determine the interfering node's identity, allowing for targeted interference mitigation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If physical cell IDs are reused for distant cells to cover large network areas, then network coverage is improved, but identity determination becomes ambiguous and interference management deteriorates
Solution Approach 1:
The identity indication is segmented into multiple components: a first part carried by synchronisation signaling and a second part carried by other signaling. This segmentation allows the full identity to be reconstructed by combining both parts, resolving the ambiguity caused by ID reuse while maintaining large network coverage.
Solution Approach 2:
The identity representation is extended from a single-dimensional physical cell ID to a multi-dimensional structure by distributing identity information across different signaling channels and time instances. This dimensional expansion enables unique identification even when spatial coverage areas overlap.
2Measurement precision
If the number of physical cell IDs is increased to provide unique identities for all cells, then identity determination accuracy is improved, but the limitations of standardized ID spaces worsen
Solution Approach 1:
The identity indication structure is nested with the first part embedded in synchronisation signaling and the second part embedded in other signaling. This nested structure allows compact representation of the full identity without requiring expansion of the standardized physical cell ID space, maintaining adaptability while achieving unique identification.
3Measurement precision
If identity information is transmitted through multiple signaling channels, then unique identity identification is achieved, but signaling complexity increases
Solution Approach 1:
The first part of the identity indication carried by synchronisation signaling serves multiple functions: it provides cell identification and enables timing synchronization. This multi-functionality reduces overall signaling complexity by combining identification and synchronization tasks into a single universal signaling mechanism.
Data Source
AI summary
There is disclosed a method of operating a network node in a radio access network, the method including transmitting an identity indication, the identity indication indicating an identity associated to the network node representing an identity out of a set of identities larger than the set of physical cell identities representable by synchronisation signaling. The disclosure also pertains to related devices and methods.