User Equipment State Information Handling for Signaling Overhead Reduction
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Solution Overview
Problem
In wireless cellular communication systems, particularly in LTE networks, there is a need to improve the processing of state information by user equipment (UE) to reduce unnecessary reporting and ensure accurate information transfer between radio access nodes during cell changes, especially regarding In-Device Co-existence (IDC) interference issues.
Innovation Solution
The method involves maintaining state information at the user equipment, transmitting current values associated with state information parts to the radio access node upon detecting specific triggers, and relying on the node holding the values if no trigger is detected. This includes receiving configuration information for measurement objects and reporting configurations, and determining unaffected frequencies to assist in handover decisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE repeats reporting of state information following every cell change, then the radio access node has up-to-date information, but unnecessary reporting increases signaling overhead and network load
Solution Approach 1:
The target radio access node sends feedback to the UE about whether it holds current state information values. The UE includes a version identifier in its reports, and the target node compares this with stored version identifiers to determine if re-reporting is necessary. This feedback mechanism allows the UE to suppress redundant reports while ensuring the target node receives updated information only when needed.
Solution Approach 2:
Instead of requiring complete re-reporting of all state information after every cell change, the system performs partial reporting only for those state information parts that have changed or are not yet held by the target node. The version identifier mechanism enables selective reporting of only the necessary portions of state information.
2Speed
If the UE transmits current state information values after every cell change, then the target radio access node receives timely information, but network resources are wasted on repetitive transmissions
Solution Approach 1:
The target radio access node provides feedback to the UE indicating whether it already holds current state information values. This feedback allows the UE to avoid unnecessary transmissions, thereby conserving network resources while maintaining timely information availability when actually needed.
Solution Approach 2:
The target radio access node proactively informs the UE about whether it holds current state information before the UE would otherwise transmit redundant data. This preliminary action prevents wasteful transmissions by giving the UE advance notice that its current information is already known at the target node.
3Measurement precision
If the UE provides detailed state information including version identifiers, then the target node can accurately determine what information is needed, but message complexity increases
Solution Approach 1:
The state information is divided into distinct parts, each with its own version identifier. This segmentation allows the system to track and report only specific changed portions of state information rather than treating it as a single monolithic structure, reducing overall message complexity while maintaining precise version control.
Data Source
AI summary
A method of processing state information in a radio access network (100). The radio access network (100) includes a first radio access node (103, 104) that is associated with a cell (105, 106) and user equipment (102). The method comprises maintaining state information at the user equipment (102), the state information comprising at least one state information part associable with different values. The method further comprises transmitting a current value associated with at least one state information part from the user equipment (102) to the first radio access node (103, 104) in response to detecting at least one predetermined trigger indicating that the first radio access node (103, 104) may not hold the current value. The method further comprises relying on the first radio access node (103, 104) holding the current value associated with the at least one state information part if no predetermined trigger is detected.