UE Conditional ULTD Enablement for Power and Coverage
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing uplink transmit diversity, particularly in conditional enabling and disabling of ULTD, which can impact system performance and power consumption, especially in scenarios like Dual Carrier High-Speed Uplink Packet Access (DC-HSUPA) configurations.
Innovation Solution
The implementation of UE-based conditional enabling of uplink transmit diversity (ULTD) using Switched Antenna Transmit Diversity (SATD) or Beamforming Transmit Diversity (BFTD), where enabling and disabling thresholds are dynamically set based on various parameters such as power headroom, active set size, and signal strength, allowing for hysteresis adjustments to optimize performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uplink transmit diversity is enabled for all UEs, then uplink transmission performance is improved, but system power consumption increases and network operation becomes less efficient
Solution Approach 1:
The patent implements dynamic enabling and disabling of uplink transmit diversity based on real-time channel conditions. The UE measures downlink channel quality indicators (such as RSCP, RSSI, Ec/No) and compares them against thresholds to dynamically switch between transmit diversity mode and normal transmission mode, making the system adaptive rather than static
Solution Approach 2:
The patent changes the operational parameters of the transmit diversity function based on measured channel conditions. When channel quality indicators fall below certain thresholds, the UE enables transmit diversity; when they exceed thresholds, the UE disables it. This parameter-based control optimizes performance while reducing unnecessary power consumption
2Reliability
If uplink transmit diversity is enabled simultaneously by all UEs, then individual UE performance is improved, but overall network operation deteriorates
Solution Approach 1:
The patent applies transmit diversity selectively to individual UEs based on their local channel conditions rather than uniformly across all UEs. Each UE independently measures its own downlink channel quality and makes local decisions about whether to enable transmit diversity, ensuring that only UEs in poor channel conditions use the feature
3Reliability
If transmit diversity is enabled in DC-HSUPA configurations, then uplink performance is improved, but system complexity and power consumption increase
Solution Approach 1:
The patent dynamically adjusts the transmit diversity function specifically for DC-HSUPA configurations based on channel conditions. The UE monitors downlink channel quality and conditionally enables or disables transmit diversity for DC-HSUPA uplink transmissions, avoiding unnecessary complexity when channel conditions are good
Solution Approach 2:
The patent modifies the operational parameters of DC-HSUPA transmissions by conditionally applying transmit diversity based on measured channel quality indicators. This selective parameter adjustment reduces system complexity while maintaining performance benefits when needed
Data Source
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AI summary
In a communication system, user equipment (UE) conditionally performs uplink transmit diversity (ULTD) either by Switched Antenna Transmit Diversity (SATD) or Beamforming Transmit Diversity (BFTD) using a first antenna and a second antenna. Either a serving node or the UE determines that uplink transmit diversity is conditionally authorized. Either a serving node or the UE measures a value. The UE transmits using ULTD in response to determining that an enabling condition based on the value is satisfied. The UE can also disable uplink transmit diversity in response to determining that a disabling condition based on the value is satisfied. The disabling condition comprises a disabling threshold that equals the enabling condition comprising an enabling threshold with a threshold adjustment for hysteresis.