Multi-SIM Modem Antenna Switching for SRS Conflict Avoidance
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Solution Overview
Problem
In multi-sim (MSIM) modems, sounding reference signal (SRS) transmissions conflict with scheduled communications, leading to suspension of SRS transmissions and negatively impacting channel characterization, power control, and modulation and coding scheme, resulting in increased error rates and reduced throughput.
Innovation Solution
The user equipment (UE) switches the set of antennas used for SRS transmissions to avoid conflicts with scheduled communications by transmitting SRSs using different resources, allowing simultaneous SRS and scheduled communication without suspension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SRS transmissions are performed using a first set of antennas, then channel characterization is achieved, but conflicts occur with scheduled communications causing transmission suspension
Solution Approach 1:
The patent dynamically switches between a first set of antennas for SRS transmissions and a second set of antennas for scheduled communications based on conflict detection. When a conflict is identified between SRS resources and scheduled communication resources, the system transitions from using the first antenna set to the second antenna set, enabling both functions to operate simultaneously without suspension and resolving the contradiction between transmission reliability and throughput performance.
2Device complexity
If the same antennas are used for both SRS and scheduled communication, then device complexity is reduced, but resource conflicts cause transmission suspension
Solution Approach 1:
The patent segments the antenna resources into a first set of antennas dedicated for SRS transmissions and a second set of antennas for scheduled communications. This segmentation allows independent operation of each function on dedicated hardware resources, eliminating conflicts while maintaining manageable system complexity through clear resource allocation and switching logic.
3Object-affected harmful factors
If SRS transmissions are suspended during scheduled communication, then resource conflicts are avoided, but channel characterization deteriorates
Solution Approach 1:
The patent introduces an antenna switching mechanism as an intermediary between SRS transmissions and scheduled communications. Instead of suspending SRS transmissions to avoid conflicts, the system uses the antenna switching intermediary to route SRS signals through the first antenna set and scheduled communications through the second antenna set, allowing both operations to proceed simultaneously without interference while maintaining continuous channel characterization.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may switch the set of antennas that the UE uses to transmit sounding reference signal (SRS) transmissions. For example, the UE may switch from transmitting first SRSs that conflict with a scheduled communication from a first set of antennas to a second set of antennas (e.g., that is, the conflict may be at the first set of antennas). The UE may be transmitting second SRSs using the second set of antennas, and the switching may cause the UE to transmit the second SRSs using the first set of antennas instead. The second SRSs may not conflict with the scheduled communication (e.g., due to using different resources than the first SRSs), which may enable the UE to transmit the second SRSs and the scheduled communication using the same first set of antennas.