LTE Advanced WWAN WLAN Channel Interference Mitigation
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Solution Overview
Problem
The coexistence of LTE Advanced and IEEE 802.11 radio access technologies in the 5 GHz unlicensed band leads to performance degradation due to conflicts and interference, limiting the efficient operation of wireless communication devices.
Innovation Solution
Implementing a method and apparatus that allow devices to operate on both licensed and unlicensed spectra using LTE Advanced radio access technology, with features like Carrier Sense Adaptive Transmission (CSAT), Opportunistic Supplemental Downlink (OSDL), and Listen Before Talk (LBT) to manage channel selection and mitigate interference, enabling carrier aggregation and efficient data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If LTE Advanced operates in the 5 GHz unlicensed band, then performance and efficiency are improved, but interference and conflicts with IEEE 802.11 occur
Solution Approach 1:
The patent implements periodic channel sensing and transmission opportunities for LTE Advanced in the unlicensed band. The system uses periodic carrier sense adaptive transmission (CSAT) where LTE transmissions occur in periodic subframes only when the channel is sensed idle, allowing coexistence with IEEE 802.11 while maintaining throughput efficiency.
Solution Approach 2:
The patent introduces an intermediary mechanism (channel sensing and coordination protocol) between LTE Advanced and IEEE 802.11 systems. The eNodeB performs carrier sensing and uses listen-before-talk (LBT) procedures to detect IEEE 802.11 activity, acting as an intermediary that mediates access to the shared unlicensed spectrum and reduces direct interference.
2Productivity
If carrier aggregation is implemented for 5 GHz unlicensed band, then data rate is improved, but device complexity increases
Solution Approach 1:
The patent segments the carrier aggregation functionality into separate modules: licensed band carrier handling, unlicensed band carrier handling, and coordination mechanisms. The device can selectively activate only the necessary carrier aggregation components based on deployment scenarios, reducing overall complexity while maintaining high data rates when needed.
Solution Approach 2:
The patent implements dynamic carrier aggregation where the device can adaptively activate or deactivate unlicensed band carriers based on channel conditions, traffic requirements, and interference levels. This dynamic approach allows the system to achieve high data rates through carrier aggregation only when beneficial, rather than maintaining fixed complex aggregation capabilities in all scenarios.
Data Source
AI summary
A method and apparatus operate a device on a licensed spectrum and an unlicensed spectrum. The device can operate on a Wireless Wide Area Network (WWAN) channel using a WWAN transceiver via a WWAN Radio Access Technology (RAT) base station using a WWAN RAT. The device can communicate with a WWAN RAT Wireless Local Area Network (WLAN) base station using the WWAN RAT via a WWAN RAT WLAN receiver on a WWAN RAT WLAN channel operating on a WLAN frequency. A personal access point WLAN channel of a WLAN frequency-based personal access point can be selected that provides the least desense of the WWAN RAT WLAN channel on the WWAN RAT WLAN receiver.