Shared LNA Gain Control for Dual SIM Dual Active Reception
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Solution Overview
Problem
In dual SIM dual active (DSDA) deployments, user equipment (UE) faces challenges in managing shared low noise amplifier (LNA) automatic gain control (AGC) effectively, leading to limited antenna usage, increased power consumption, and manufacturing costs, while existing solutions complicate receive strength imbalance across network subscriptions.
Innovation Solution
The UE receives signals from multiple network subscriptions via a shared LNA and splits them into separate receive paths, determining gain states for each path based on signal strength, allowing for dynamic adjustment and prioritization of network subscriptions to optimize antenna usage without increasing the number of operated antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate LNAs are used for each network subscription, then receive signal quality for each subscription is improved, but device complexity and manufacturing costs increase
Solution Approach 1:
The patent combines multiple receive paths into a single shared LNA architecture. The first and second receive paths both utilize the same shared LNA, reducing the total number of LNAs required. This merging approach maintains signal quality through proper gain management while decreasing device complexity and manufacturing costs.
Solution Approach 2:
The shared LNA is designed to serve multiple network subscriptions simultaneously. By making the LNA universal and capable of handling multiple receive paths, the system avoids the need for dedicated LNAs for each subscription, thereby reducing complexity while maintaining functionality across different network subscriptions.
2Productivity
If multiple antennas are operated for multiple network subscriptions, then reception diversity and throughput are improved, but power consumption and manufacturing costs increase
Solution Approach 1:
The patent implements dynamic gain control for the shared LNA based on which network subscription is currently active. The system adjusts the LNA gain state dynamically - using a first gain state for the first network subscription and a second gain state for the second network subscription. This dynamic adaptation allows the system to maintain optimal performance with fewer antennas operated at any given time, reducing power consumption while preserving throughput capability.
3Device complexity
If a shared LNA is used for multiple network subscriptions, then device complexity is reduced, but receive strength imbalance across subscriptions occurs
Solution Approach 1:
The patent addresses receive strength imbalance by changing the gain parameter of the shared LNA based on the active network subscription. When the first network subscription is active, the LNA operates at a first gain state; when the second network subscription is active, it switches to a second gain state. This parameter adjustment ensures that each subscription receives the appropriate signal strength despite sharing the same LNA, maintaining reliability while keeping device complexity low.
4Reliability
If gain control is optimized for one network subscription, then signal quality for that subscription is improved, but signal quality for other subscriptions deteriorates
Solution Approach 1:
The system dynamically adjusts the shared LNA gain state based on which network subscription is currently active. The gain control is optimized for the active subscription by selecting the appropriate gain state, while maintaining the capability to switch to different gain states for other subscriptions. This dynamic approach ensures optimal signal quality for the current subscription without permanently compromising support for other subscriptions.
Solution Approach 2:
The patent pre-configures multiple gain states in the shared LNA, each optimized for different network subscriptions. By having these gain states prepared in advance, the system can quickly switch between them depending on which subscription is active, ensuring optimal signal quality is maintained across different subscriptions without requiring real-time gain calculation.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. In some systems, a user equipment (UE) may support multi-subscriber identity module (SIM) operation in dual SIM dual active (DSDA) deployments. In some aspects, the UE may receive, via an antenna of the UE, a first signal associated with a first network subscription on a first receive path of the antenna and a second signal associated with a second network subscription on a second receive path of the antenna. The UE may determine a signal strength for each of the first signal and the second signal, determine a first gain for the first receive path and a gain for a low noise amplifier (LNA) coupled with the antenna based on the signal strength of the first signal, and determine a gain for the second receive path based on the signal strength of the second signal and the gain of the LNA.