Base Station Power Control via SIR Down-Regulation
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Solution Overview
Problem
In wireless communication networks, power congestion at the air interface of a base station leads to increased received total wideband power, causing system instability and potential service degradation for edge users, including momentary mute or call drops for QoS-sensitive users like voice users.
Innovation Solution
A power control method that determines when received total wideband power exceeds a congestion threshold, sending a congestion indication to the RNC to prevent up-regulation of the target signal-to-interference ratio (SIR), down-regulating the SIR, and notifying user equipment (UE) to reduce transmit power, thereby stabilizing the system and maintaining service quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UEs increase transmit power to contend for air interface resources, then the ability to access the air interface is improved, but the received total wideband power (RTWP) of the base station increases causing power congestion
Solution Approach 1:
The base station measures RTWP and provides feedback to the RNC when RTWP exceeds a threshold. The RNC adjusts the target SIR based on this feedback, creating a closed-loop control system that prevents power congestion while maintaining air interface access capability.
Solution Approach 2:
The system dynamically changes the target SIR parameter based on RTWP conditions. When RTWP is high, the RNC reduces the target SIR, which indirectly controls UE transmit power without directly commanding power reductions, thus resolving the contradiction between access capability and power consumption.
2Reliability
If the RNC up-regulates the target SIR to improve service quality, then the signal quality is improved, but the transmit power of UEs increases further aggravating power congestion
Solution Approach 1:
The base station continuously monitors RTWP and provides feedback to the RNC. When RTWP exceeds the threshold, the RNC receives this feedback and stops up-regulating the target SIR, preventing further transmit power increases while maintaining adequate service quality through the feedback control mechanism.
Solution Approach 2:
The system takes preliminary anti-action by having the base station proactively send congestion indications to the RNC before severe power congestion occurs. This allows the RNC to preemptively stop SIR up-regulation, preventing the harmful effect of further transmit power increases while service quality is still acceptable.
3Power
If the base station sends congestion indications to the RNC, then the power congestion is controlled, but the system complexity increases
Solution Approach 1:
The congestion indication mechanism is implemented locally at the base station level, where only the base station experiencing power congestion sends indications to its associated RNC. This localized approach controls power congestion without requiring system-wide complexity increases, as each base station independently manages its own congestion conditions.
Data Source
AI summary
Embodiments of the present invention disclose a power control method and apparatus, relate to the field of wireless communications, and are invented for reducing power pressure of an air interface of a base station and ensuring a stable network environment. The method includes: determining whether received total wideband power (RTWP) of an air interface exceeds a set first congestion threshold value; when the RTWP of the air interface exceeds the set first congestion threshold value, sending a congestion indication to a radio network controller (RNC), where the congestion indication is used for indicating that the RNC is forbidden from up-regulating a target signal-to-interference ratio (SIR); receiving a target SIR sent by the RNC; down-regulating the target SIR sent by the RNC; and notifying, based on the down-regulated target SIR, a user equipment (UE) to reduce transmit power. The present invention is mainly applied to the field of power control.