E-DPCCH Gain Factor Scaling for HSUPA Power Control
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Solution Overview
Problem
The Release 7 specification of the 3GPP HSUPA system faces challenges in determining the E-DPCCH gain factor when the E-DPCCH boost mode is configured, leading to uncertainties in power determination and potential exceeding of the maximum allowed transmit power, which complicates system performance and implementation.
Innovation Solution
The solution involves determining data and control channel gain factors, reducing the data channel gain factor when the total transmit power exceeds the maximum allowed value, and using the control channel gain factor before reducing the data channel gain factor when the boost mode is configured, with explicit signaling from the Node B to the UE and algorithms for scaling to ensure compliance with the maximum power constraint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the E-DPCCH boost mode is configured to provide more power for the control channel, then the control channel power is improved, but the total transmit power may exceed the maximum allowed value
Solution Approach 1:
The patent implements dynamic adjustment of the E-DPCCH gain factor based on the configured boost mode. When boost mode is configured, the system dynamically selects a higher gain factor from a set of reference gain factors, allowing the control channel power to be adaptively increased while remaining within maximum transmit power constraints through coordinated data channel scaling.
Solution Approach 2:
The patent changes the parameter of the E-DPCCH gain factor by introducing a boost mode configuration that selects from multiple reference gain factors. This parameter change allows the system to transition between different power levels for the control channel, enabling higher power when needed while maintaining compliance with maximum transmit power limits through associated data channel power adjustments.
2Productivity
If the range of E-DPCCH gain factor is increased to support higher data rates in Release 7, then the data rate capability is improved, but the complexity of gain factor determination is worsened
Solution Approach 1:
The patent segments the gain factor determination into distinct modes (normal mode and boost mode) with clearly defined reference gain factor sets. This segmentation simplifies the determination process by providing discrete, pre-defined gain factor options for each mode, reducing the complexity of real-time calculations while supporting higher data rates through the expanded range of available gain factors.
Solution Approach 2:
The patent establishes reference gain factors in advance for both normal and boost modes, allowing the UE to pre-determine appropriate gain factors based on the configured mode and current transmit power conditions. This preliminary setup of reference values simplifies real-time operation by eliminating complex on-the-fly calculations, thereby reducing device complexity while maintaining high data rate capability.
3Ease of manufacture
If the E-DPCCH gain factor is determined independently of E-DPDCH gain factor as in Release 6, then the implementation is simplified, but the power allocation flexibility is reduced
Solution Approach 1:
The patent creates a universal gain factor determination mechanism that functions in both independent (normal mode) and coordinated (boost mode) configurations. The same reference gain factor sets and determination procedures serve dual purposes: simplifying implementation through standardized procedures while providing power allocation flexibility through mode selection and configurable boost parameters, thereby achieving both simplicity and adaptability.
Data Source
AI summary
There is provided a method and a program and an apparatus (e.g., a user equipment) that determines a data channel gain factor and a control channel gain factor; determines that total transmit power would exceed a maximum allowed value after applying the data and control channel gain factors; reduces the data channel gain factor so that the total transmit power does not exceed the maximum allowed value; and uses the control channel gain factor that is applied before the data channel factor is reduced when a boost mode is configured for the control channel (e.g., if TFCIi>E-TFCIec, boost). There may a plurality k of data channels E-DPDCHk and k data channel gain factors βed, k which are reduced by scaling each of them equally. When the boost mode is not configured the control channel gain factor which is used is received in signaling from an access node.