Dynamic Power Allocation for Component Carriers with Different Timing Configurations
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Solution Overview
Problem
In wireless communication systems, especially those using enhanced component carriers (eCCs), there is an inefficiency in power allocation due to outdated uplink schedule information, leading to suboptimal transmit power levels, particularly when carriers have different timing configurations, causing inefficiencies in power usage and potential quality of service (QoS) issues.
Innovation Solution
A user equipment (UE) is configured to dynamically adjust transmit power among component carriers with different timing configurations using a joint power control configuration, allowing for efficient power allocation based on base station power control information and priority settings, enabling power borrowing between carriers to ensure QoS standards are met, even with unanticipated overlapping uplink grants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the device allocates power according to outdated uplink schedule information, then the power allocation process is simple, but the power transmission efficiency deteriorates
Solution Approach 1:
The device performs preliminary power allocation based on available schedule information (even if outdated), then dynamically adjusts power levels before transmission when new scheduling information becomes available. This preliminary action allows the system to have a ready power allocation plan while still optimizing based on current conditions.
Solution Approach 2:
The power allocation system transitions from static allocation based on outdated information to dynamic allocation that adapts when new scheduling information arrives. The device can adjust power levels dynamically between the outdated schedule and current transmission requirements, optimizing power efficiency without requiring complete redesign of the allocation process.
2Loss of energy
If the device uses joint power control configuration to dynamically adjust power among carriers, then the power transmission efficiency improves, but the device complexity increases
Solution Approach 1:
The device merges power control configurations across multiple component carriers into a unified joint power control mechanism. By combining the power adjustment logic for different carriers with different timing configurations into a single coordinated system, the device achieves efficient power distribution without managing separate complex control mechanisms for each carrier.
Solution Approach 2:
The joint power control configuration serves multiple functions simultaneously: it manages power allocation across carriers with different timing configurations, handles unanticipated overlapping uplink grants, and maintains QoS standards. This multi-functional approach reduces the need for separate specialized control mechanisms.
3Ease of operation
If the device allocates power based on outdated uplink schedule information, then the control process is straightforward, but the quality of service deteriorates
Solution Approach 1:
The device establishes a preliminary power allocation based on the most recent available schedule information, ensuring there is always a baseline control process in place. When new scheduling information arrives, the device updates the power allocation, maintaining both operational simplicity and service quality through this layered approach.
Solution Approach 2:
The system implements feedback mechanisms where the device monitors incoming scheduling information and compares it with the current power allocation based on outdated schedules. This feedback loop allows the device to detect when updates are needed and adjust power allocation accordingly, maintaining QoS without requiring constant manual intervention.
4Reliability
If the device implements power borrowing between carriers, then the quality of service is maintained, but the control complexity increases
Solution Approach 1:
The joint power control configuration acts as an intermediary mechanism that coordinates power borrowing between carriers. Rather than implementing complex direct power transfer protocols between individual carriers, the unified power control system mediates the power allocation, simplifying the control mechanism while enabling QoS maintenance through inter-carrier power adjustment.
Data Source
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AI summary
Methods, systems, and devices for wireless communication are described. A user equipment (UE) may coordinate power utilization across component carriers (CCs) with different transmission time interval (TTI) configurations. For example, the UE may reserve a portion of the transmit power for a CC with a reduced TTI length (e.g., an enhanced CC (eCC)). In other examples, the UE may dynamically allocate power between CCs with overlapping uplink periods. That is, the UE may borrow power allocated to one CC to transmit on an eCC. The UE may use a prioritization scheme to determine the transmit power for each CC. In some cases, the UE may send a power headroom report based on the power level of the eCC. The power headroom may be a virtual power headroom based on predicted eCC transmission power, or an actual power headroom based on uplink scheduling.