Candidate-Cell Power Prioritization for Uplink Threshold Compliance
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Solution Overview
Problem
Existing power prioritization rules in wireless communications systems fail to adequately account for uplink transmissions to non-serving cells, leading to inefficiencies and potential exceedance of maximum power thresholds.
Innovation Solution
Implement power prioritization rules that consider both serving and candidate cells, allocating transmit power to ensure total UE transmit power for all cells does not exceed the maximum threshold, using RRC signaling to manage power allocation for uplink transmissions such as PRACH, PUSCH, PUCCH, and SRS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing power prioritization rules are used that only consider serving cells, then power allocation for serving cell transmissions is simplified, but total UE transmit power may exceed maximum thresholds and mobility efficiency deteriorates
Solution Approach 1:
The power allocation process is segmented into two distinct stages: first allocating power to serving cell transmissions, then separately allocating power to candidate cell transmissions. This segmentation allows each stage to be optimized independently while ensuring total power compliance, resolving the contradiction between simplified allocation and threshold compliance.
Solution Approach 2:
The network entity performs preliminary power allocation for serving cells before the UE attempts to allocate power for candidate cells. This preliminary action establishes a power budget that the UE must respect, ensuring that candidate cell allocations will not cause total power to exceed maximum thresholds while maintaining relatively simple UE-side processing.
2Productivity
If power is allocated to candidate cells without considering total power constraints, then mobility signaling efficiency improves, but power threshold compliance deteriorates
Solution Approach 1:
The network entity provides feedback to the UE regarding the allocated serving cell power and the remaining power budget. This feedback mechanism enables the UE to allocate candidate cell power while ensuring total power compliance, thereby maintaining both mobility signaling efficiency and power threshold compliance.
Solution Approach 2:
The network entity performs preliminary power allocation for serving cells before the UE attempts to allocate power for candidate cells. This preliminary action establishes a power budget that the UE must respect, ensuring that candidate cell allocations will not cause total power to exceed maximum thresholds while maintaining relatively simple UE-side processing.
3Ease of operation
If power prioritization rules exclude candidate cells, then UE processing complexity is reduced, but mobility management effectiveness deteriorates
Solution Approach 1:
The power allocation process is segmented into two distinct stages: first allocating power to serving cell transmissions, then separately allocating power to candidate cell transmissions. This segmentation allows each stage to be optimized independently while ensuring total power compliance, resolving the contradiction between simplified allocation and threshold compliance.
Solution Approach 2:
The network entity acts as an intermediary that provides power allocation guidance to the UE. By supplying pre-calculated power budgets and priorities, the network entity enables the UE to maintain simple processing while effectively managing power across both serving and candidate cells, thus improving mobility management without significantly increasing UE complexity.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for power prioritization including physical random access channel (PRACH) on candidate cells. An example method, performed at a user equipment (UE), includes allocating transmit power for a transmission of a signal to a candidate cell based on a power prioritization rule that considers UE transmit power for transmissions on the candidate cell and at least one other cell, and transmitting the signal to the candidate cell according to the allocation.