NR-DC SCell Group Signalling Configuration Management
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Solution Overview
Problem
Current group signalling in NR-NR dual connectivity (NR-DC) is unclear regarding the interaction between SCell group signalling configuration and Individual SCell configuration, particularly in handling the presence/absence of fields, delta signalling of SCell group configurations, and the coordination of SCell group configurations between Master Cell Group (MCG) and Secondary Cell Group (SCG).
Innovation Solution
Implement cross-checking of included fields in RRC messages to determine the presence or absence of 'Need OR' fields, track parameters configured via SCell group or Individual SCell configuration, allow SCell group signalling to overwrite previous Individual SCell configurations, limit SCell group signalling to SCell addition cases, and explicitly indicate which SCells each SCell group configuration applies to, ensuring clear and coordinated SCell group configuration management across MCG and SCG.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If group signalling is used to configure multiple SCells with common parameters, then signalling overhead is reduced, but configuration complexity and ambiguity increase due to unclear interaction with Individual SCell configuration
Solution Approach 1:
The patent segments the configuration management into two distinct layers: SCell group configuration (affecting multiple SCells) and Individual SCell configuration (affecting single SCell). This segmentation allows the system to maintain both group-level common parameters and cell-specific parameters independently, resolving the ambiguity about which configuration takes precedence.
Solution Approach 2:
The patent applies local quality by allowing different configuration rules to apply to different parts of the system. SCells that are members of an SCell group inherit common parameters from the group configuration, while SCells that are not members maintain their individual configurations. This enables targeted application of configuration rules based on local needs.
2Adaptability or versatility
If SCell group configuration is allowed to modify existing SCell configurations, then configuration flexibility improves, but configuration collisions and errors increase between MCG and SCG
Solution Approach 1:
The patent introduces an intermediary mechanism in the form of explicit indication fields that mediate between SCell group configuration and Individual SCell configuration. These indication fields clearly specify which SCells are affected by group configuration, preventing unintended modifications and configuration collisions between MCG and SCG.
Solution Approach 2:
The patent applies preliminary action by requiring explicit indication of which SCells should be affected by group configuration before the configuration is applied. This preliminary specification prevents configuration collisions by ensuring that only intended SCells are modified, maintaining reliability while allowing flexibility.
3Loss of information
If field presence/absence is used to indicate configuration options, then signalling efficiency improves, but interpretation ambiguity increases regarding whether to release or maintain previous configurations
Solution Approach 1:
The patent implements feedback by introducing explicit indication fields that provide clear feedback about the intended configuration behavior. Instead of relying on implicit field presence/absence interpretation, the indication fields explicitly state whether previous configurations should be released or maintained, eliminating ambiguity while maintaining signalling efficiency.
4Ease of operation
If SCell group signalling is limited to SCell addition cases only, then configuration clarity improves, but configuration capability is reduced
Solution Approach 1:
The patent applies dynamics by making the SCell group configuration system adaptable to different operational scenarios. The system can operate in a simplified mode for SCell addition cases (maintaining clarity) while also supporting modification cases with explicit indication fields (maintaining capability). The behavior dynamically adjusts based on the specific configuration scenario.
Data Source
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AI summary
According to an aspect, there is provided a method performed by a wireless device for handling group signalling of secondary cell, SCell, configuration information. The method comprises receiving (1010) configuration information for at least a first SCell, wherein the configuration information comprises values for one or more fields in a set of fields; determining (1020) whether to configure the first SCell according to the received configuration information; and configuring (1030) the first SCell based on the result of the determining.