Uplink Power Control via Single Downlink Carrier
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Solution Overview
Problem
In the LTE-Advanced system, there is no clear method for transmitting uplink transmission power control commands, which complicates practical application due to the use of carrier aggregation, where multiple downlink component carriers correspond to multiple uplink component carriers.
Innovation Solution
The method involves transmitting uplink transmission power control information for all uplink component carriers allocated to a user equipment (UE) via one downlink component carrier, using DCI formats 3 and 3A, where the power control information is carried in a consecutive domain and the initial position is marked in high-layer signaling, allowing for efficient power control across multiple uplink channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation is used to aggregate multiple component carriers to achieve larger bandwidth, then system capacity and data rate are improved, but the complexity of power control management increases due to multiple downlink component carriers corresponding to multiple uplink component carriers
Solution Approach 1:
The patent combines power control information for multiple uplink component carriers into a single downlink control information (DCI) message transmitted on one downlink component carrier. Instead of sending separate power control commands for each uplink carrier, the invention merges all power control instructions into one consolidated message, reducing the number of control channels needed and simplifying the management complexity while maintaining support for multiple aggregated carriers
Solution Approach 2:
The patent makes a single downlink component carrier serve multiple functions by using it to transmit power control information for all uplink component carriers. This downlink carrier becomes a universal control channel that manages power for the entire carrier aggregation system, eliminating the need for separate control channels for each uplink carrier and reducing overall system complexity
2Measurement precision
If separate power control information is transmitted for each uplink component carrier, then power control precision is improved, but signaling overhead and control channel resources are increased
Solution Approach 1:
The patent merges power control information for multiple uplink component carriers into a single DCI message. The DCI format includes power control fields that collectively cover all uplink carriers, using bit fields and indexing mechanisms to represent power control commands for multiple carriers within a unified structure, thereby reducing signaling overhead while preserving individual carrier control capability
Solution Approach 2:
The patent segments the power control information within the consolidated DCI message into distinct fields or sub-messages, each corresponding to specific uplink component carriers. This segmentation allows the receiver to extract and apply appropriate power control commands for each carrier while the information is transmitted through a single unified control channel, maintaining precision without increasing overall signaling overhead
Data Source
Figure 1~4
AI summary
A method and an apparatus for transmitting uplink transmission power control information are disclosed. The method includes: transmitting uplink transmission power control information of all uplink component carriers allocated to a user equipment (UE) to the UE by one downlink component carrier. By adopting the above technical scheme, it is implemented that the uplink transmission power control information is transmitted in a carrier aggregation system.