Base Station Power Control via Non-Power Command Feedback
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Solution Overview
Problem
In wireless communication networks, particularly in CDMA networks, there is a challenge in determining whether power control commands are received correctly by mobile stations since there is no direct feedback available, making it difficult to adjust the transmit power for reliable reception.
Innovation Solution
A method and apparatus where a base station transmits power control commands at a first transmit power and non-power control commands at a second transmit power, using processor circuits to control the first transmit power based on whether the mobile station correctly responds to the non-power control commands, such as rate control or retransmit control commands, allowing inference of the appropriate transmit power for reliable reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power control commands are transmitted at high power to ensure reliable reception, then reception reliability is improved, but energy consumption and interference increase
Solution Approach 1:
The system uses feedback from mobile station responses to non-power control commands to infer power control command reception quality. The base station transmits non-power control commands and observes whether mobile stations respond correctly, using this feedback to adjust power control command transmit power dynamically, thereby optimizing energy consumption while maintaining reliable reception.
Solution Approach 2:
The mobile station indirectly provides feedback about power control command reception by responding to non-power control commands. The base station uses these responses to self-adjust the transmit power of power control commands without requiring direct feedback channels, enabling autonomous power optimization.
2Measurement precision
If direct feedback channels are implemented for power control commands, then power control accuracy is improved, but system complexity increases
Solution Approach 1:
Non-power control commands serve as intermediaries to carry implicit feedback information about power control command reception. Instead of implementing direct feedback channels, the system uses existing non-power control command responses as mediators to convey reception quality information, avoiding additional channel complexity while improving power control accuracy.
Solution Approach 2:
Non-power control commands perform multiple functions: they control mobile station operations and simultaneously serve as carriers for implicit feedback about power control command reception. This multi-functionality eliminates the need for separate feedback channels, reducing system complexity while maintaining measurement precision.
3Reliability
If transmit power is continuously adjusted based on real-time conditions, then communication reliability is improved, but control loop complexity increases
Solution Approach 1:
The base station transmits non-power control commands in advance to elicit responses that indicate power control command reception quality. These preliminary actions provide forward-looking information about channel conditions, enabling proactive power adjustments before communication failures occur, thereby improving reliability without requiring complex real-time control loops.
Data Source
AI summary
A method and apparatus to provide a deterministic power control mechanism for the transmission of mobile station power control commands based on transmitting non-power control commands for which mobile stations exhibit deterministic, observable responses at related transmit powers, e.g., at the same power. For example, a wireless network base station may adjust the target used for sending power control commands to a given mobile station by observing whether that mobile station correctly responds to rate control or retransmit control commands sent at the same transmit power. The mobile station's response (or non-response) to such non-power control commands is readily observable and can be taken as an indication of whether the power target is sufficient for current radio conditions. Although not so limited, this approach may be particularly beneficial where non-power control commands are sent along with the power commands on a sub-channel of a common power control channel.