LTE-ISM Coexistence Coordination for Interference Avoidance
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Solution Overview
Problem
Concurrent operation of LTE and ISM wireless technologies in mobile devices often results in interference due to overlapping frequency bands, leading to performance degradation and the need for co-existence coordination to manage transmission and reception effectively.
Innovation Solution
The implementation of co-existence coordination methods, such as scheduling ISM reception priority and adapting LTE transmissions based on criteria like device configuration and network thresholds, to avoid interference between LTE and ISM radio technologies, including techniques like HARQ-enabled abort of LTE data PUSCH transmission and TTI bundling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If LTE and ISM wireless technologies operate concurrently in mobile devices, then device functionality and communication versatility are improved, but interference between the two technologies occurs due to overlapping frequency bands
Solution Approach 1:
The patent segments the operation of LTE and ISM technologies by dividing time into distinct intervals. During ISM reception intervals, LTE transmission is suspended or adapted. This temporal segmentation allows both technologies to coexist without interference, as they operate in separated time slots rather than concurrently on overlapping frequencies.
2Object-affected harmful factors
If co-existence coordination is implemented to schedule transmission and reception, then interference is reduced, but device complexity increases
Solution Approach 1:
The patent implements preliminary action by pre-scheduling ISM reception intervals and notifying the LTE layer in advance. The device prepares for potential LTE transmission adaptations before they are needed, allowing the LTE layer to proactively adjust its transmission schedule based on predetermined ISM reception requirements, thereby reducing interference while managing complexity through advance planning.
3Object-affected harmful factors
If LTE transmission is adapted to avoid ISM reception, then interference is eliminated, but LTE uplink performance may degrade
Solution Approach 1:
The patent applies partial action by selectively adapting LTE transmission only during specific ISM reception intervals rather than continuously. LTE transmission proceeds normally during non-ISM intervals, maintaining optimal uplink performance when interference avoidance is not required. This partial adaptation minimizes the impact on LTE productivity while still eliminating interference during critical ISM reception periods.
Data Source
AI summary
Example embodiments generally relate to adapting a transmission via first wireless technology to avoid interference with a reception via a second wireless technology. For example, a user equipment (e.g. cell phone) can include radios operating according to first and second wireless radio technologies, which can include Long Term Evolution (LTE) and a technology using the industrial, scientific and medical (ISM) frequency band. When a priority request is asserted by a radio operating in the ISM frequency band, the LTE radio may abort a scheduled transmission when certain “transmission abort criteria” are satisfied.