Cell Global Identity Reporting with SIB1 Status Feedback
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Solution Overview
Problem
In 5G networks, the absence of System Information Block 1 (SIB1) can lead to failures in Cell Global Identity (CGI) reporting mechanisms, making it difficult for the network to determine whether failed CGI reporting is due to the absence of SIB1 or poor detection, thus hindering automatic neighbor relation (ANR) procedures.
Innovation Solution
A method where a wireless terminal reports the presence or absence of SIB1 in the neighbor cell, allowing the network to differentiate between SIB1 absence and detection failures, and adjust CGI reporting strategies accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the network sends CGI reporting requests to UEs in 5G networks, then the network can obtain neighbour cell information for ANR procedures, but the network cannot determine whether failed CGI reporting is due to SIB1 absence or poor detection
Solution Approach 1:
The patent introduces a feedback mechanism where the UE reports not only the CGI detection result but also the SIB1 presence status. This feedback allows the network to distinguish between two types of failures: (1) SIB1 is absent from the neighbour cell, and (2) SIB1 is present but CGI detection failed due to poor radio conditions. The network uses this feedback information to appropriately adjust ANR procedures.
Solution Approach 2:
The patent segments the CGI reporting process into separate detection steps: first detecting whether SIB1 is present in the neighbour cell, then detecting CGI within SIB1. By segmenting this process and reporting each step's result separately, the network can identify exactly where the failure occurs in the information gathering process.
2Quantity of substance
If the network continues to send CGI reporting requests when SIB1 is absent, then more CGI data can be collected, but unnecessary requests waste network resources and time
Solution Approach 1:
The UE provides feedback information about SIB1 presence status to the network. When the network receives this feedback indicating SIB1 is absent from a neighbour cell, it can stop sending further CGI reporting requests for that cell, avoiding waste of network resources and UE battery energy on futile detection attempts.
Solution Approach 2:
The network performs a preliminary check of SIB1 presence before initiating full CGI reporting procedures. This preliminary action filters out cells where CGI acquisition is impossible, preventing subsequent unnecessary detection requests and saving network resources.
3Ease of operation
If the network treats all CGI reporting failures the same way, then the ANR procedure is simple to implement, but it cannot optimize for different failure causes
Solution Approach 1:
The patent applies different handling strategies for different failure scenarios: when SIB1 is absent, the network marks the cell as unsuitable for CGI reporting; when SIB1 is present but detection fails, the network may retry or adjust detection parameters. This localized differentiation of response strategies optimizes ANR efficiency without significantly complicating the overall procedure.
Data Source
AI summary
The invention refers to a wireless device and to operating the wireless terminal, UE, connected to a serving network node associated to a serving cell of a radio access network, RAN, the method comprising: receiving system information from a neighbour cell of the serving cell, determining from the system information if the neighbour cell does or does not broadcast a global cell identifier, CGI, of the neighbour cell; and if the neighbour cell does not broadcast the CGI, transmitting a global cell identifier, CGI, report to the serving network node, wherein the CGI report includes an indication that the neighbour cell does not broadcast the CGI of the neighbour cell. The invention further refers to a corresponding network node and to a method performed in the network node.