Uplink Control Channel Power Offset for Transmit Diversity
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Solution Overview
Problem
The LTE system lacks a defined power offset value for uplink control channels when both channel selection and transmit diversity are applied, posing a challenge in determining transmission power efficiently.
Innovation Solution
A method to determine the transmission power of an uplink control channel efficiently by incorporating power offset values for cases where both channel selection and transmit diversity are used, specifically for PUCCH formats, using parameters like CQI, HARQ, and SR bits, and adjusting the power control based on the number of serving cells and transmission blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmit diversity is applied for channel selection in uplink control channel, then transmission reliability is improved, but power control definition is incomplete
Solution Approach 1:
The patent introduces a new parameter Δ_TxD(F') that specifically addresses the power offset for channel selection with transmit diversity. This parameter change resolves the incomplete power control definition by providing a dedicated power control mechanism for the previously undefined scenario, allowing the system to maintain reliability while completing the power control framework.
2Measurement precision
If power offset values are determined differently for respective uplink control channel formats, then transmission power control precision is improved, but system complexity increases
Solution Approach 1:
The patent applies local quality by defining specific power offset values for different uplink control channel formats (PUCCH format 1a, 1b, 2, 2a, 2b, 3, 4, 5). Each format receives tailored power control parameters appropriate to its characteristics, improving precision while managing complexity through systematic differentiation rather than universal approaches.
Solution Approach 2:
The patent segments the power control mechanism by creating distinct power offset definitions for different PUCCH formats and transmission scenarios. By dividing the power control into format-specific segments (e.g., Δ_TxD(F) for traditional formats, Δ_TxD(F') for channel selection with TxD), the system achieves precise control for each segment while maintaining overall system manageability.
3Adaptability or versatility
If channel selection and transmit diversity are both applied, then ACK/NACK transmission capability is improved, but power offset value definition becomes undefined
Solution Approach 1:
The patent performs preliminary action by pre-defining the power offset parameter Δ_TxD(F') specifically for the channel selection with transmit diversity scenario before actual transmission occurs. This preliminary definition ensures that when both channel selection and TxD are applied, the power control parameters are already established, preventing any loss of information regarding power offset values.
Data Source
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AI summary
The present invention provides a method for controlling transmission power of an uplink control channel carried out by an user equipment in a wireless communication system and an user equipment using the method. The method comprises: receiving uplink power control information; and determining transmission power of an uplink control channel based on the uplink power control information, wherein the uplink power control information includes a power offset value determined according to whether transmit diversity is applied when the uplink control channel is transmitted through a channel selection scheme.