UE Soft Buffer Sizing for Legacy LTE Category Compatibility
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Solution Overview
Problem
In LTE networks, the limited soft buffer size in user equipment leads to miscommunication between user equipment and base stations due to differing understandings of buffer sizes, particularly when newer user equipment categories with different buffer sizes interact with legacy systems, causing channel coding corruption and data unreliability.
Innovation Solution
A method for user equipment to signal information about multiple categories to the base station, allowing both to determine a common soft buffer size based on transmission modes, ensuring compatibility and accurate rate matching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If user equipment with newer categories and different soft buffer sizes operate in legacy networks, then network capacity and performance are improved, but miscommunication and channel coding corruption occur due to differing buffer size understandings between user equipment and base stations
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the soft buffer size parameter based on the user equipment category. The base station determines the appropriate soft buffer size according to the UE category information received from the user equipment, allowing newer categories with larger buffer sizes to operate correctly in legacy networks while maintaining compatibility. This resolves the contradiction by adapting the buffer size parameter to match the UE category, preventing channel coding corruption while enabling network capacity improvements.
2Adaptability or versatility
If user equipment signals information about multiple categories to the base station, then compatibility and accurate rate matching are achieved, but device complexity and signaling overhead increase
Solution Approach 1:
The patent implements universality by using a single UE category information parameter that serves multiple functions: it identifies the user equipment type, determines the soft buffer size, and enables accurate rate matching. Instead of separate signaling for each parameter, the UE category information acts as a universal indicator that the base station uses to derive all necessary configuration parameters, thereby reducing signaling overhead while maintaining compatibility.
3Device complexity
If soft buffer size is limited in user equipment, then device cost and complexity are reduced, but miscommunication occurs between user equipment and base stations due to differing buffer size understandings
Solution Approach 1:
The patent applies feedback by having the user equipment signal its category information to the base station, which then uses this feedback to determine the appropriate soft buffer size and configure rate matching accordingly. This feedback loop ensures that the base station and user equipment have a common understanding of the buffer size, preventing channel coding information loss while allowing the user equipment to maintain its limited buffer capacity.
Data Source
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AI summary
The embodiments herein relate to a method in a user equipment (605) for communicating with a base station (603) in a communications network (600). The user equipment (605) is configured to communicate with the base station (603) according to a selectable of at least two user equipment categories. The user equipment (605) selects one of the at least two user equipment categories if information indicating the one of the user equipment categories is received from the base station (603). The user equipment (605) selects a default of the user equipment categories if no information indicating which of the user equipment categories is received from the base station (603). The user equipment (605) determines a soft buffer size according to the selected user equipment category. The user equipment (605) communicates with the base station (603) according to the selected user equipment category and applying the determined soft buffer size.