PUSCH Power Control for Uplink Control Information
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Solution Overview
Problem
In LTE systems, the existing power control formula for the physical uplink shared channel (PUSCH) becomes meaningless when there is only uplink control information but no uplink shared channel data, leading to ineffective transmission power setting and performance decline.
Innovation Solution
A method to set the transmission power of the PUSCH using the total number of bits in channel quality indication signaling and its cyclic redundancy check, along with an amplitude offset, when there is only uplink control information, using the formula P PUSCH i = min(P MAX, 10 ⋅ log 10 M PUSCH i + P O_PUSCH j + α ⋅ PL + Δ TF i + f i, where Δ TF i is adjusted based on the presence of uplink control information or data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the existing power control formula is used when TBS=0, then the formula becomes meaningless with infinite ΔTF(i), but the system needs to maintain power control functionality for uplink control information transmission
Solution Approach 1:
The patent changes the parameter definition of ΔTF(i) from being based on TBS (which becomes 0 for control information only) to being based on the number of resource elements allocated for control information transmission. This parameter substitution resolves the infinity problem while maintaining the power control formula's functionality.
Solution Approach 2:
Instead of trying to handle the TBS=0 case within the existing data transmission framework, the patent inverts the approach by defining the power control parameters specifically for control information transmission scenarios, treating control information as the primary transmission type rather than an exception to data transmission.
2Reliability
If the transmission power is not controlled when only uplink control information is sent, then the power control mechanism fails, but setting arbitrary power may affect transmission performance
Solution Approach 1:
The patent incorporates feedback mechanisms by using the actual resource allocation information (number of resource elements) to dynamically adjust the power control parameters. This ensures that the transmission power is optimized based on the actual transmission requirements while maintaining ease of operation through automated calculation.
3Adaptability or versatility
If the power control formula is modified to handle TBS=0 cases, then power control can be realized for control information, but the formula becomes more complex with additional conditions
Solution Approach 1:
The patent creates a universal power control formulation that works for both data transmission and control information transmission by unifying the parameter definitions. The modified formula serves multiple functions (data and control) without requiring separate specialized formulas, reducing overall system complexity despite the initial modification effort.
Data Source
Figure 1
AI summary
This invention provides a transmission power control method for a physical uplink shared channel, including: when there is only uplink control information but no uplink shared channel data sent over the physical uplink shared channel, the transmission power of the physical uplink shared channel is set according to the total number of bits contained in a channel quality indication signaling and its corresponding cyclic redundancy check as well as an amplitude offset. This invention also provides a transmission power control system for a physical uplink shared channel. The method and system described in this invention can ensure the overall performance of a system.