Adaptive UE Receive State Transition via Spectral Efficiency Weighting
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Solution Overview
Problem
Current wireless communication systems fail to adaptively manage receive states based on the payload and coding rate of downlink grants, leading to suboptimal power savings and performance due to reliance on grant count alone.
Innovation Solution
Implementing a traffic state machine (STM) in user equipment (UE) that calculates weighting factors based on spectral efficiency (SPEF) for received downlink grants, applying these to burst detection and scheduling rate functions to determine transitions between different receive states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the UE transitions between receive states based solely on the number of downlink grants received, then the system complexity is reduced and the operation is simpler, but the power savings and performance optimization are suboptimal because the payload and coding rate are not considered
Solution Approach 1:
The patent changes the parameters used for receive state transition decisions from simple grant count to a composite metric that includes spectral efficiency (SPEF), payload size, and coding rate. This allows the UE to make more informed decisions about when to activate additional receive antennas, thereby reducing unnecessary power consumption while maintaining performance optimization.
Solution Approach 2:
The patent implements a feedback mechanism where the UE continuously monitors downlink grant characteristics (SPEF, payload, coding rate) and adjusts receive state accordingly. This feedback loop enables dynamic adaptation to actual traffic conditions, allowing the system to save power by using fewer antennas when traffic is light while activating more antennas when high-SPEF traffic requires it for optimal performance.
2Reliability
If the UE uses more receive antennas to improve reception reliability, then the communication reliability improves, but the power consumption increases
Solution Approach 1:
The patent makes the receive antenna configuration dynamic rather than static. The UE dynamically adjusts the number of active receive antennas based on real-time assessment of downlink traffic characteristics, particularly SPEF and payload size. This dynamic adaptation ensures that the UE uses the minimum necessary antennas to achieve reliable reception, avoiding the constant power consumption of maintaining all antennas active.
Solution Approach 2:
The patent changes the threshold parameters for antenna activation from fixed grant counts to dynamic SPEF-based thresholds. By using SPEF (which incorporates coding rate and payload information), the system can more accurately determine when additional antennas are needed for reliable reception, thereby optimizing the reliability-power consumption tradeoff.
3Device complexity
If the UE measures traffic conditions using only grant count, then the measurement complexity is reduced, but the spectral efficiency utilization is not optimized
Solution Approach 1:
The patent changes the traffic measurement parameters from simple grant count to SPEF-based measurements that capture the actual information content and coding characteristics of downlink transmissions. This allows the UE to accurately assess spectral efficiency utilization and make appropriate receive state transitions, thereby optimizing productivity while managing the added measurement complexity through efficient processing of SPEF data.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive one or more downlink grants while operating in accordance with a first receive state during a threshold number of transmission time intervals (TTIs). The UE may determine a weighting factor for each TTI within the threshold number of TTIs, where the determined weighting factors are based on a spectral efficiency (SPEF) of channel communications between the UE and a base station. The UE may sum a subset of the weighting factors to determine a transition determination value, and may transition from the first receive state to a second receive state based on evaluation of the transition determination value.