Terminal Device Ci Field Expansion for LTE-WLAN Interference
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Solution Overview
Problem
The communication method and standard differences between LTE and wireless LAN cause interference, leading to deteriorated transmission efficiency in coexistence scenarios.
Innovation Solution
A terminal device and base station device that expand the Ci field based on MAC CE via RRC signaling to manage secondary cell activation or deactivation, improving communication efficiency by optimizing radio resource control and signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If LTE and wireless LAN operate in the same unlicensed band, then frequency band utilization is improved, but interference between different communication standards occurs and transmission efficiency deteriorates
Solution Approach 1:
The patent introduces a base station device as an intermediary that coordinates between LTE and wireless LAN operations. The base station manages carrier aggregation configurations and controls the activation/deactivation of secondary cells, acting as a mediator that prevents direct interference between the two communication standards while allowing them to share the unlicensed band resources.
Solution Approach 2:
The patent implements dynamic activation and deactivation of secondary cells based on traffic conditions and interference levels. The base station can dynamically adjust the Ci field values in MAC CE messages to control which secondary cells are active, allowing the system to adaptively manage resource allocation and minimize interference between LTE and wireless LAN operations.
2Productivity
If multiple secondary cells are activated for carrier aggregation, then transmission efficiency is improved, but signaling complexity and device complexity increase
Solution Approach 1:
The patent segments the control of multiple secondary cells by introducing a compact Ci field representation in MAC CE messages. Instead of handling each secondary cell independently with full signaling, the Ci field provides a segmented, condensed representation that allows efficient control of multiple cells while reducing the overall signaling overhead and complexity.
Solution Approach 2:
The patent changes the parameter representation by using a compact Ci field with optimized bit encoding. This parameter change allows the system to represent multiple secondary cell states more efficiently, reducing the signaling message size and processing complexity while maintaining the ability to control multiple cells for carrier aggregation.
Data Source
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AI summary
Provided are a terminal device, a base station device, and a method that make it possible to communicate efficiently in a communication system in which a base station device and a terminal device communicate. The terminal device communicates with the base station device and is provided with a higher layer processing unit that expands a Ci field based on a MAC CE when a secondary cell list is expanded via RRC signalling.