LIPA Indication via RRC Signaling for Cell Selection
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Solution Overview
Problem
Current 3GPP LTE/LTE-A systems lack an efficient method for providing Local IP Access (LIPA) indication to user equipment, affecting cell selection and PDN connection establishment, particularly in scenarios where LIPA capability information is not clearly communicated to user equipment.
Innovation Solution
Proposed methods include statically configuring LIPA information in user equipment, using Radio Resource Control (RRC) signaling for broadcasting or unicasting LIPA capability, and Non-Access Stratum (NAS) signaling to provide LIPA capability information, enabling user equipment to prioritize LIPA-capable cells and establish corresponding packet data network connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If LIPA indication is provided via UE configuration or RRC/NAS signaling, then cell selection capability is improved, but signaling complexity and implementation clarity are worsened
Solution Approach 1:
The patent segments the LIPA indication mechanism into multiple independent components: eNB-side configuration (en-CellLIPAIndication), UE-side capability indication (LIPA-Indication), and NAS signaling (LIPA-capability). This segmentation allows each component to be optimized independently and clarifies the responsibilities of different network elements, reducing overall implementation complexity while maintaining versatile cell selection capability.
Solution Approach 2:
The patent introduces an intermediary mechanism where the eNB configures LIPA indication parameters and the UE uses these parameters to make cell selection decisions. The LIPA-Indication field in RRC connection setup acts as an intermediary signal that bridges the eNB's LIPA capability and the UE's cell selection algorithm, simplifying the interaction between these components.
2Measurement precision
If detailed LIPA indication methods are implemented, then cell selection accuracy is improved, but implementation clarity and standard definition are worsened
Solution Approach 1:
The patent applies local quality by providing cell-specific LIPA indication parameters (en-CellLIPAIndication) that are specific to each cell's capabilities. This allows the UE to accurately identify which cells support LIPA without requiring complex network-wide configuration, improving cell selection accuracy while maintaining clear implementation guidelines through cell-level granularity.
Solution Approach 2:
The patent implements preliminary action by having the eNB configure and indicate LIPA capability information before the UE performs cell selection. The LIPA indication is provided in advance through RRC connection setup messages, allowing the UE to make informed cell selection decisions without requiring complex real-time detection or measurement during the selection process.
Data Source
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AI summary
A method of providing Local IP Access (LIPA) indication is proposed. In one novel aspect, an enhanced cell selection method is proposed using LIPA capability information. Based on LIPA capability related information, a UE is able to prioritize LIPA-capable cells and establish a corresponding packet data network (PDN) connection accordingly. In a first embodiment, LIPA information is statically configured in the UE. In a second embodiment, LIPA information is informed to the UE via broadcasting or unicasting Radio Resource Control (RRC) signaling.