Tune-Away Gap Control via Intended-False Buffer Status Report
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Solution Overview
Problem
In wireless communication systems, multi-SIM user equipment faces conflicts and inefficiencies due to contention for RF resources when accessing multiple radio access technologies, leading to performance issues during tune-away operations between different radio access technologies.
Innovation Solution
A user equipment determines a tune-away gap and transmits an intended-false buffer status report to modify the duration of this gap, allowing for efficient management of uplink data transmissions by adjusting the uplink grant, thereby minimizing conflicts between different radio access technologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE performs tune-away from first RAT to second RAT on a single RF chain, then the UE can access multiple radio access technologies, but RF resource contention and conflicts between different RATs occur
Solution Approach 1:
The UE performs preliminary actions by transmitting an intended-false BSR before the actual data transmission to reserve uplink resources. This allows the network to allocate uplink grants in advance, ensuring that when the UE returns from tune-away, the uplink resources are already prepared and ready, avoiding RF resource conflicts.
Solution Approach 2:
The intended-false BSR acts as an intermediary mechanism between the UE's tune-away operation and the network's uplink scheduling. It mediates the conflict by providing the network with advance information about upcoming data transmissions, allowing the network to coordinate RF resource allocation accordingly.
2Productivity
If the UE transmits actual buffer status report during tune-away gap, then uplink data transmissions can be scheduled, but conflicts with tune-away operation occur
Solution Approach 1:
The UE transmits the intended-false BSR before the tune-away gap ends, performing the buffer status reporting action in advance. This allows the network to schedule uplink grants before the UE returns from tune-away, ensuring reliable data transmission without interfering with the tune-away operation.
Solution Approach 2:
The system dynamically adjusts the timing of buffer status reports based on the tune-away gap duration. By making the BSR transmission timing flexible and adaptive to the tune-away operation, the system can maintain both uplink productivity and tune-away reliability.
3Device complexity
If the UE uses single RF chain for multi-RAT access, then device complexity is reduced, but RF resource contention increases
Solution Approach 1:
The UE performs preliminary buffer status reporting before actual data transmission to reserve uplink resources. This advance scheduling allows the single RF chain to be allocated to different RATs in a coordinated manner, reducing RF resource contention despite the limited number of RF chains.
Solution Approach 2:
The intended-false BSR provides feedback to the network about upcoming data transmission needs. This feedback mechanism allows the network to dynamically adjust RF resource allocation, compensating for the limitations of a single RF chain configuration.
Data Source
AI summary
A user equipment (UE) determines a tune-away gap in which the UE performs a tune-away from a first radio access technology (RAT) to a second RAT on a single radio frequency (RF) chain, and transmits an intended-false buffer status report (BSR) to modify a duration of the determined tune-away gap. The intended-false BSR indicates an intended-false value of uplink data pending in a buffer to be transmitted on the first RAT, so that an uplink grant for uplink data transmissions on the first RAT to be received at the UE is modified.