RRC Connection Resumption via Base Station Capability Ranking
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Solution Overview
Problem
User equipment (UE) supporting the 'light connection' (LC) feature faces service interruptions when transitioning to base stations that do not support LC, as they do not understand the UE's context resumption request, leading to inefficient re-establishment of RRC connections and potential service disruptions.
Innovation Solution
The UE receives information on base station capabilities to support LC and constructs a ranking list to select base stations that support LC for resuming RRC connections, adapting measurement thresholds and timers to prioritize cells with LC support, and requests either context resumption or new connection setup based on this information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the UE uses context resumption to establish RRC connection, then the connection establishment time is reduced and signaling overhead is decreased, but service interruptions occur when transitioning to base stations that do not support LC
Solution Approach 1:
The UE performs preliminary actions by storing context information and preparing resumption requests before needing to re-establish connections. The network pre-configures the UE with context resumption capabilities, so when the UE needs to reconnect, it can immediately use the stored context rather than starting a full connection setup procedure.
Solution Approach 2:
The system dynamically adapts the connection establishment method based on network conditions and base station capabilities. The UE can switch between context resumption (when supported) and full connection setup (when not supported), making the connection establishment process flexible and adaptive to different scenarios.
2Productivity
If the UE prioritizes cells with LC support in cell selection, then connection resumption efficiency is improved, but the cell selection process becomes more complex
Solution Approach 1:
The UE applies different selection criteria to different cells based on their local characteristics. Cells supporting LC are evaluated with preferences for context resumption, while cells not supporting LC are evaluated using traditional connection setup criteria. This localized quality approach allows efficient resumption where possible without compromising overall selection robustness.
Solution Approach 2:
The system changes the cell selection parameters dynamically based on UE capabilities and network support. When the UE is LC-capable and the network supports it, the cell selection algorithm modifies parameters to prioritize cells that enable context resumption. The algorithm adjusts ranking criteria, measurement thresholds, and selection priorities to reflect the benefits of LC support.
Data Source
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AI summary
The present invention provides a method of operating a user equipment. UE, device suitable for connection to a mobile communications network, the method comprising receiving information from a plurality of base stations of the mobile communications network, the information providing the UE device with an indication as to whether each base station supports resuming a radio resource control, RRC, connection; using the information to construct a ranking list of the plurality of base stations according to a suitability of the base stations for RRC connection resumption operation; and selecting from the ranking list a base station to which a radio resource control connection resume message is sent for re-establishing an RRC connection previously released by another base station.