MSIM UE Uplink Scheduling via Tune-Away Gap Avoidance
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Solution Overview
Problem
In wireless communication systems, particularly in multi-subscriber identity module (MSIM) user equipment (UE) with dual connectivity, there is a challenge in avoiding collisions between paging occasions of different subscriptions, leading to potential baseband conflicts and UL transmission outages, which result in increased block error ratio and throughput loss.
Innovation Solution
The MSIM UE receives UL data in a buffer and determines if a tune-away gap is scheduled; if so, it transmits a scheduling request only on the communication path not affected by the tune-away gap, thereby preempting potential outages and ensuring reliable data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the MSIM UE transmits scheduling requests on both dual connectivity paths, then UL data transmission reliability is improved, but baseband conflicts and transmission outages occur during tune-away gaps
Solution Approach 1:
The MSIM UE performs preliminary action by checking whether a tune-away gap is scheduled before transmitting scheduling requests on dual connectivity paths. The UE determines the time duration between receiving UL data in the buffer and the tune-away gap, and uses this information to decide whether to transmit scheduling requests on both paths or only on the first path, thereby avoiding baseband conflicts while maintaining transmission reliability.
2Reliability
If the MSIM UE monitors for paging occasions on both subscriptions, then paging message reception is improved, but collisions between paging occasions of different subscriptions occur
Solution Approach 1:
The MSIM UE performs preliminary action by determining whether a tune-away gap is scheduled before transmitting scheduling requests. The UE checks the time duration between receiving UL data and the tune-away gap to prevent transmitting on paths that would cause collisions during paging occasions, thereby avoiding baseband conflicts while maintaining reliable paging message reception.
3Productivity
If the MSIM UE transmits scheduling requests on all available paths, then data throughput is improved, but block error ratio increases due to collisions
Solution Approach 1:
The MSIM UE performs preliminary action by checking for scheduled tune-away gaps before transmitting scheduling requests on dual connectivity paths. The UE determines the time duration between receiving UL data in the buffer and the tune-away gap, and uses this information to selectively transmit scheduling requests only on paths that will not cause collisions, thereby maintaining high data throughput while avoiding block errors.
Data Source
AI summary
Mechanisms for uplink (UL) scheduling in dual connectivity scenarios are provided. According to one aspect of the present disclosure, a method of wireless communication performed by a user equipment (UE) includes: receiving, in an uplink (UL) buffer, first UL data for transmission to at least one base station (BS) via a first path and a second path, wherein the first path and the second path are associated with a dual connectivity communication mode; transmitting, to a first BS on the first path, a first scheduling request for the first UL data; and refraining, based on a time duration between the receiving the first UL data in the buffer and a tune-away gap on the second path, from transmitting a second scheduling request for the first UL data on the second path.