MAC Control Element Format Adaptation for Carrier Aggregation
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Solution Overview
Problem
In carrier aggregation systems, existing technologies face challenges in efficiently managing MAC control elements, particularly in determining the optimal format for Timing Advance Control (TAC) MAC control elements across multiple cells, which affects communication efficiency and bandwidth utilization.
Innovation Solution
The method determines the TAC MAC control element format based on the highest TAG index among the indices of the plurality of TAGs, optimizing the length of the cell index field in MAC control elements to accommodate up to 32 serving cells, thereby reducing signaling overhead and enhancing communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed format for TAC MAC control element is used, then device complexity is reduced, but adaptability to different numbers of carriers deteriorates
Solution Approach 1:
The patent applies dynamics by making the MAC control element format adaptable rather than fixed. The format dynamically adjusts based on the highest TAG index, allowing the system to accommodate varying numbers of carriers (up to 32) while maintaining efficient signaling. This resolves the contradiction by enabling the format to change according to system conditions rather than being static.
Solution Approach 2:
The patent changes the parameter of MAC control element format based on the highest TAG index. By varying the format parameters (such as the number of bits allocated for carrier indexing) according to the actual number of active carriers, the system achieves both reduced complexity (by not supporting all possible formats always) and improved adaptability (by adjusting to the current configuration).
2Adaptability or versatility
If the cell index field length is increased to accommodate more carriers, then adaptability improves, but signaling overhead increases
Solution Approach 1:
The patent applies local quality by allocating different field lengths in the MAC control element based on the specific number of carriers. Instead of using a uniformly long field for all cases, the format is optimized locally for each scenario - using only the necessary number of bits to represent the highest TAG index. This reduces signaling overhead while maintaining the ability to support up to 32 carriers when needed.
3Loss of information
If MAC control element format is optimized for fewer carriers, then signaling overhead is reduced, but adaptability to carrier aggregation deteriorates
Solution Approach 1:
The patent makes the MAC control element format dynamic, allowing it to adapt to different carrier aggregation scenarios. When fewer carriers are active, a compact format is used to reduce overhead. When more carriers need to be supported, the format expands to accommodate higher TAG indices. This dynamic adaptation resolves the contradiction between minimizing overhead and maintaining carrier aggregation capability.
Data Source
AI summary
The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for generating a MAC CE in a carrier aggregation system, the method comprising: configuring a plurality of Timing Advance Groups (TAGs), wherein each of the plurality of TAGs corresponds to a respective TAG index; determining a size of a TAG index field in a MAC CE depending on a highest TAG index among the indices of the plurality of TAGs; and generating the Medium Access Control (MAC) Control Element (CE) according to the size of the TAG index field.