UE Category Handling for LTE Version Compatibility
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Solution Overview
Problem
The compatibility issue between User Equipment (UE) and networks running different LTE versions leads to communication malfunctions, as legacy networks cannot interpret UE categories introduced in newer versions, causing data rate mismatches and performance issues.
Innovation Solution
A method where the UE reports both first and second UE categories during network attachment, allowing the eNB to determine the appropriate category for communication, and configures soft channel bits accordingly, using the first category group if no category information is provided in handover messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a late release UE reports its native UE category (e.g., Category 6+) to the network, then the UE can achieve optimized data rates and performance, but the early release network cannot understand the UE category information causing communication malfunction
Solution Approach 1:
The UE category information is segmented into multiple fields: a first UE category field for early release networks and a second UE category field for late release networks. This segmentation allows the UE to provide compatible category information to early release networks while also indicating support for advanced categories to late release networks, resolving the compatibility issue without sacrificing data rate optimization.
Solution Approach 2:
The patent introduces an intermediary mechanism where the UE reports both legacy UE category information and enhanced UE category information. The network then acts as an intermediary that selects the appropriate category based on its release version, enabling seamless transition and compatibility between different network versions without direct conflict.
2Adaptability or versatility
If the UE reports multiple UE categories to the network, then the network can select the appropriate category for compatibility, but the UE configuration and handover process becomes more complex
Solution Approach 1:
The UE performs preliminary action by pre-configuring multiple UE categories and their corresponding parameters before network attachment. The UE capability report message is pre-formed with both first and second UE category information, so that when the network selects a category, the UE already has the necessary configuration parameters ready, avoiding complex real-time configuration decisions.
Solution Approach 2:
The UE configuration is made dynamic through the handover procedure where the UE can switch between different UE category configurations based on the target network's release version. The UE dynamically adjusts its operating parameters by selecting from pre-configured categories, maintaining adaptability without requiring complex reconfiguration algorithms.
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AI summary
A User Equipment (UE) category handling method and an apparatus for handling late version UE category attached to an early release version network in a Long Term Evolution (LTE) system are provided. A communication method includes transmitting a terminal capability report message including multiple terminal categories, receiving a Radio Resource Control (RRC) connection reconfiguration message including a terminal category to be used by the terminal according to serving base station of the terminal, and communicating with the network using the terminal category received from the network. The UE category handling method and apparatus of the present invention allows the UE to report a network-adaptive UE category, thereby avoiding soft buffer problem caused by version information mismatch and facilitating communication with the network without malfunctioning.