Dual-Subscription SRS Multiplexing Across Shared Antenna Ports
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Solution Overview
Problem
In wireless communications systems supporting dual-SIM dual-active mode, the sharing of radio frequency (RF) resources for transmitting sounding reference signals (SRS) is inefficient, leading to incomplete SRS transmission and incorrect channel estimation, which reduces signaling performance.
Innovation Solution
The UE enables sharing of RF transmission ports for SRS transmissions associated with multiple subscriptions, allowing for time or frequency multiplexing of SRS signals on non-overlapping resources, and utilizes UE assistance information (UAI) messages to request and allocate these resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If RF transmission ports are shared for SRS transmissions in dual-SIM dual-active mode, then resource utilization is improved, but SRS transmission completeness deteriorates
Solution Approach 1:
The patent segments the SRS transmission resources by introducing separate spatial relation information for first and second SRS resources, allowing independent configuration and transmission paths for each subscription's SRS signals while sharing the same RF transmission port, thus preventing transmission conflicts and ensuring completeness
Solution Approach 2:
The patent dynamically switches between different spatial relation information configurations based on which subscription is currently active, enabling adaptive resource allocation that maintains complete SRS transmission while optimizing RF port utilization through time-varying spatial configurations
2Device complexity
If RF transmission ports are shared for SRS transmissions, then device complexity is reduced, but channel estimation accuracy deteriorates
Solution Approach 1:
The patent applies different spatial relation information locally to different SRS resources (first SRS resource vs. second SRS resource), allowing each subscription to have optimized spatial configuration specific to its channel characteristics, thereby maintaining high channel estimation accuracy while sharing RF ports
Solution Approach 2:
The patent introduces spatial relation information as an intermediary parameter that mediates between the shared RF transmission port and the subscription-specific channel characteristics, enabling accurate channel estimation by providing distinct spatial configuration for each subscription's SRS transmission
3Productivity
If SRS transmissions from multiple subscriptions are multiplexed on the same RF resources, then resource efficiency is improved, but signaling performance deteriorates
Solution Approach 1:
The patent resolves resource conflicts by introducing a spatial dimension through separate spatial relation information configurations, allowing SRS transmissions from multiple subscriptions to be multiplexed in time-frequency resources while being distinguished in the spatial domain, thus preventing information loss and maintaining signaling performance
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may activate a dual-subscription dual-active mode that enables the UE to communicate uplink signals such as sounding reference signals (SRS) using at least two subscriptions via one or more antenna ports of the UE. The UE may transmit, using a first antenna port, a first uplink signal associated with a first subscription of the UE multiplexed on a first set of uplink resources with a second uplink signal associated with a second subscription of the UE. The UE may then transmit, using a second antenna port, the first uplink signal associated with the first subscription multiplexed on the set of uplink resources with the second uplink signal associated with the second subscription.