Terminal Output Power Control via Channel Assignment Messages
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Solution Overview
Problem
In wireless communication networks, terminals face difficulties in determining the correct output power level, especially during handovers, Dual Transfer Mode operations, and when common broadcast channels are mapped on different frequency bands than traffic channels, leading to poor connection quality and interference.
Innovation Solution
A system and method that involves generating a channel assignment message with a maximum terminal output power level value, which is transmitted to the terminal to define its output power level, ensuring accurate power control in changing circumstances such as handovers and Dual Transfer Mode operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the terminal uses system information messages from BCCH/PBCCH to determine output power levels, then the terminal can obtain power control parameters in idle mode, but the terminal receives conflicting or unavailable parameters when the Traffic Channel is mapped on a different band than the common channels
Solution Approach 1:
The patent introduces a new message type (e.g., HANDOVER COMMAND, PACKET HANDOVER COMMAND, or CHANNEL ASSIGNMENT message) as an intermediary carrier to transmit the maximum terminal output power level parameter. This intermediary message bridges the gap between the network and terminal, providing accurate power control information specifically tailored for the traffic channel frequency band, thereby resolving the conflict between idle-mode power parameters and transfer-mode power requirements across different frequency bands.
2Productivity
If the terminal increases output power to improve data throughput, then better radio conditions are achieved, but excessive power consumption and interference to other channels occur
Solution Approach 1:
The patent implements a feedback mechanism where the network continuously monitors radio conditions and sends power control commands (e.g., TBF_MS_TXPWR_MAX parameter) to the terminal based on current channel quality, interference levels, and network load. This closed-loop feedback enables dynamic adjustment of terminal output power, ensuring optimal throughput while preventing excessive interference to other channels by adapting power levels in real-time based on network conditions.
3Reliability
If the terminal uses higher output power to maintain connection quality during handover, then connection stability is improved, but power consumption increases and may cause interference to other terminals
Solution Approach 1:
The patent applies preliminary action by providing the terminal with the maximum output power level parameter (TBF_MS_TXPWR_MAX) in advance through handover command messages before the actual handover execution. This allows the terminal to pre-configure its power settings for the target cell, ensuring seamless connection quality during handover while avoiding excessive power consumption by setting appropriate power limits beforehand rather than reacting to connection degradation after it occurs.
Data Source
AI summary
A system, apparatus, computer program product, and method for controlling output power levels of over-the-air (OTA) transmission signals from a terminal operable on a network. At least one parameter used by the terminal in establishing its proper RF output power level is provided by the network in a channel assignment message(s). The terminal can then define the proper output power level in changing circumstances, such as where the common broadcast channel is mapped on a different band than traffic channels, in connection with handover or DTM operations, etc. Further, the parameter is provided via the channel assignment message(s) in connection with DTM operation after handover, where the common broadcast channel is mapped on the same frequency band as the traffic channel. When the proper output power level has been defined using the parameter received from the channel assignment message, the terminal can communicate information to the network using the proper output power level.