Uplink Power Allocation Formula Selection for Out-of-Band Emission Control
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Solution Overview
Problem
Current wireless communication systems face challenges in managing power allocation for uplink channels to meet stringent out-of-band emission requirements in multicarrier and multi-cell operation, leading to performance deterioration due to suboptimal filtering and increased emissions.
Innovation Solution
A wireless terminal is equipped with processor circuitry to select between different formulae for determining an allocation type for an uplink transmission based on the location of the allocated resource block relative to the channel bandwidth, allowing for optimized configured maximum transmission power settings to minimize out-of-band emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If suboptimal filtering is used for power allocation in multicarrier operation, then device complexity is reduced, but out-of-band emissions increase causing interference to adjacent frequency bands
Solution Approach 1:
The patent changes the parameter of power allocation by selecting between different formulae (first and second formulae) based on resource block allocation type. This parameter change enables the system to achieve optimal power distribution that satisfies out-of-band emission requirements without requiring complex filtering mechanisms, thus resolving the contradiction between filtering complexity and emission control.
Solution Approach 2:
The patent applies preliminary action by determining the allocation type and selecting the appropriate power allocation formula before actual power transmission. This pre-calculation of power values based on resource block location (edge vs. inner allocations) ensures that emissions are controlled from the source rather than requiring post-processing filtering, reducing device complexity while maintaining emission compliance.
2Ease of operation
If traditional power allocation methods are used without considering allocation type, then ease of operation is maintained, but system performance deteriorates due to increased interference
Solution Approach 1:
The patent segments the power allocation process into two distinct paths based on allocation type: edge resource block allocations and inner resource block allocations. Each segment uses a specialized formula tailored to its specific characteristics. This segmentation improves communication reliability by optimizing power for each case while maintaining ease of operation through clear, rule-based selection criteria that automatically determine which formula to apply.
3Device complexity
If uniform power allocation is applied across all resource blocks, then device complexity is minimized, but interference between adjacent frequency bands increases
Solution Approach 1:
The patent applies local quality by using different power allocation strategies for different locations within the frequency spectrum. Edge resource blocks (at the boundaries of carrier bandwidth) use one formula, while inner resource blocks use another. This localized approach targets the specific problem of out-of-band emissions at frequency edges without complicating the overall system, as the selection rule is simple and automatic.
Data Source
AI summary
A wireless terminal comprises receiver circuitry and processor circuitry. The receiver circuitry is configured to receive, over the radio interface, information upon which determination of allocation type determination formula(e) is dependent. The processor circuitry configured to: (1) use the received information to determine which allocation type determination formula(e) is to be used to determine an allocation type; (2) use the allocation type determination formula(e) to determine the allocation type, a type of the allocation type being determined depending on location of an allocated resource block for the uplink channel relative to channel bandwidth; and (3) use the allocation type to determine a parameter for a configured maximum transmission power for an uplink channel upon which an uplink transmission is transmitted.