UE Frequency Restriction for In-Device Coexistence Interference
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Solution Overview
Problem
In-device coexistence (IDC) interference occurs in wireless communication systems due to the proximity of multiple radio transceivers operating on adjacent frequencies, leading to significant interference issues that current filter technologies cannot adequately address, particularly in the interworking of 3GPP and WLAN networks.
Innovation Solution
A method and apparatus for a user equipment (UE) to receive restriction information and a timer value from a network, allowing it to restrict the usage of specific frequencies affected by IDC interference, thereby preventing interference by starting a timer and limiting frequency usage based on the received information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If filter technologies are used to avoid interference between transceivers, then interference between two transceivers may be avoided, but interference power from collocated radio transceivers operating on adjacent frequencies or sub-harmonic frequencies cannot be sufficiently rejected
Solution Approach 1:
The network pre-configures restriction information and timer values for frequencies that may cause IDC interference. The UE proactively restricts frequency usage before interference occurs by checking against the pre-configured restriction information, rather than reacting to interference after it happens.
Solution Approach 2:
The network acts as an intermediary by providing restriction information about frequencies that should be avoided. The UE uses this network-provided information to make frequency selection decisions, mediating between the UE's communication needs and interference avoidance requirements.
2Adaptability or versatility
If multiple radio transceivers are equipped in a UE for ubiquitous network access, then network access capability is improved, but in-device coexistence interference occurs due to extreme proximity of transceivers
Solution Approach 1:
The frequency spectrum is segmented into restricted and non-restricted bands based on network-provided restriction information. The UE segments its frequency selection process by checking against the restriction information list, allowing simultaneous operation of multiple transceivers on non-conflicting frequencies.
Solution Approach 2:
The UE performs preliminary checks against restriction information before selecting frequencies for transceiver operation. This proactive approach prevents IDC interference before it occurs, enabling multiple transceivers to coexist by avoiding problematic frequency combinations.
3Object-affected harmful factors
If frequency restriction information is implemented to prevent IDC interference, then interference during transmission is prevented, but device complexity increases due to timer management and frequency restriction logic
Solution Approach 1:
The UE autonomously manages its own frequency restriction by maintaining a local copy of restriction information and timer values. The device self-monitors timer expiration and automatically updates frequency usage decisions without continuous network intervention, reducing signaling overhead and simplifying implementation.
Solution Approach 2:
The restriction information includes timer values that create periodic review cycles. The UE periodically checks timer expiration to determine whether frequency restrictions should be lifted, providing structured, manageable complexity through time-based automation rather than continuous complex decision-making.
Data Source
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AI summary
A method and apparatus for restricting a frequency in a wireless communication system is provided. A user equipment (UE) receives restriction information and a timer value from a network, starts a timer based on the timer value, and restricts usage of a frequency based on the restriction information.