In-Device Coexistence Interference Control via TDM Assistance
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Solution Overview
Problem
In-device coexistence interference occurs in wireless communication systems when multiple frequency bands, such as Bluetooth and LTE, are used simultaneously, leading to interference issues due to insufficient frequency band separation, and existing techniques like FDM and TDM require additional operating procedures between UE and eNB for effective interference control.
Innovation Solution
A method and apparatus for controlling in-device coexistence interference using Time Division Multiplexing (TDM) by transmitting assistance information about available and unavailable time intervals to the eNB, allowing for coordinated interference control between different network systems within a UE, enabling effective interference mitigation without requiring band-to-band movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple frequency bands are used simultaneously for data transmission, then transmission capacity is improved, but in-device coexistence interference occurs
Solution Approach 1:
The patent segments the transmission process by dividing time into distinct intervals for different network systems. The UE transmits assistance information indicating unavailable time intervals to the eNB, allowing the eNB to schedule transmissions that avoid interference with other network systems operating in the device.
Solution Approach 2:
The patent implements periodic time division multiplexing where different network systems operate in alternating time intervals. The assistance information includes periodic patterns of available and unavailable intervals, enabling systematic coordination between LTE and other radio access technologies.
2Object-affected harmful factors
If Frequency Division Multiplexing (FDM) is used to control in-device coexistence interference, then interference between frequency bands is reduced, but additional operating procedures are required
Solution Approach 1:
Instead of using frequency division to separate networks, the patent inverts the approach by using time division. The UE informs the eNB about time intervals when other networks are transmitting, and the eNB schedules LTE transmissions to avoid these intervals, achieving interference control through temporal rather than spectral separation.
3Object-affected harmful factors
If Time Division Multiplexing (TDM) is used to control in-device coexistence interference, then interference is controlled by separating transmission times, but additional operating procedures are required
Solution Approach 1:
The UE autonomously determines its own transmission and reception schedules for different network systems and generates assistance information based on its internal timing requirements. This self-service approach allows the UE to manage its own interference without requiring complex coordination protocols with the eNB.
Solution Approach 2:
The UE provides feedback to the eNB through assistance information about its unavailable time intervals. The eNB uses this feedback to adjust its scheduling decisions, creating a closed-loop system where the network adapts to the device's multi-radio timing requirements.
4Productivity
If bandwidth is increased to meet transmission capacity demand, then data transmission capability is improved, but power consumption increases
Solution Approach 1:
The patent enables dynamic bandwidth utilization by allowing the UE to operate on multiple carrier frequencies simultaneously when needed for high data rates, while the eNB can schedule transmissions in unavailable intervals to reduce overall power consumption. The system adapts bandwidth usage based on traffic requirements and interference conditions.
Data Source
AI summary
The present invention provides an apparatus and a method for controlling coexistence interference within a device in a wireless communication system. The method discloses the following steps: performing triggering, in which a transmission, which is generated in a terminal, in a first frequency band of a first network system requests controlling of interference on a reception, which is generated in the terminal, in a second frequency band of a second network system; transmitting to a base station support information including information on a time section that can or cannot be used by the first network system of the second network system, due to the interference; and receiving from the base station reply information for accepting or denying interference control as a reply to the support information.