PICH Frame Power Adaptation for Base Station Energy Efficiency
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Solution Overview
Problem
The existing PICH frame transmission in 3GPP systems consumes excessive power at the base station, as it uses the same power levels for both paging and no-paging scenarios, leading to increased downlink interference and power waste.
Innovation Solution
A method and apparatus that dynamically adjust the transmission power of PICH frames based on whether paging is occurring, using a higher power when paging is detected and a lower power when no paging is detected, with the power offset ranging from 0 to 10 dB, allowing for reduced power consumption and optimized Ec/Io of the primary common pilot channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station transmits PICH frames using the same power level for both paging and no-paging scenarios, then the UE can reliably detect paging indicators, but the power consumption of the base station increases and downlink interference increases
Solution Approach 1:
The patent applies dynamics by making the PICH transmission power adaptive rather than fixed. The base station dynamically adjusts the transmission power based on the paging indicator content: using higher power when paging is present and lower power when no paging is detected. This resolves the contradiction by allowing the system to maintain reliability only when needed while reducing power consumption during no-paging periods.
Solution Approach 2:
The patent changes the transmission power parameter based on the paging condition. When paging is detected, the base station uses a first transmission power level; when no paging is detected, it uses a second, lower transmission power level. This parameter change allows the system to optimize both reliability and energy efficiency by matching the transmission power to the actual communication needs.
2Reliability
If the base station transmits PICH frames using high power level always, then the UE can reliably detect paging indicators, but the downlink interference in the cell increases
Solution Approach 1:
The patent makes the transmission power dynamic based on paging conditions. Instead of continuously transmitting at high power, the base station only uses high power when paging is actually present. This dynamic adjustment reduces downlink interference during no-paging periods while maintaining reliable detection when needed.
Solution Approach 2:
The base station periodically monitors paging indicator information and adjusts transmission power accordingly. This periodic action allows the system to maintain high power only during necessary periods while using lower power during extended no-paging intervals, thereby reducing overall downlink interference in the cell.
3Use of energy by stationary object
If the base station reduces PICH transmission power when no paging is detected, then power consumption and downlink interference are reduced, but the false detection probability of PICH increases
Solution Approach 1:
The patent changes the transmission power parameter based on the paging indicator bitmap. When all bits indicate no paging, the base station uses reduced power; when at least one bit indicates paging, it uses full power. This parameter change optimizes power consumption while managing the trade-off with detection accuracy through intelligent power adaptation.
Data Source
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AI summary
The present invention discloses a method and an apparatus for transmitting a Paging Indicator Channel (PICH) frame, wherein the method for transmitting a PICH frame comprises: a base station setting a transmission power of a first type of PICH frame to be greater than a transmission power of a second type of PICH frame, wherein at least one Paging Indicator (PI) which equals to 1 is comprised in each PICH frame of the first type of PICH frame, and all PIs in each PICH frame of the second type of PICH frame equal to 0; and the base station using the set transmission power of the first type of PICH frame to transmit the first type of PICH frame, or using the set transmission power of the second type of PICH frame to transmit the second type of PICH frame. By reducing the transmission power of PICH when there is no paging, the present invention can reduce power consumption of a base station, optimize Ec/Io of a primary common pilot channel in a cell, thus the problem in the traditional art that the power consumption of a base station is too large when transmitting a PICH frame is solved.