Secondary Reverse Link Carrier Power Initialization
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Solution Overview
Problem
In wireless communication networks, especially CDMA-based systems, initializing the transmit power for secondary reverse link carriers is challenging due to the unavailability of channel feedback at the outset, leading to potential over or under-powering, which affects connection success and interference.
Innovation Solution
A base station controller determines and transmits initialization power offset information to mobile stations to set the initial transmit power for secondary reverse link carriers based on reverse link loading differences relative to primary reverse link carriers, allowing for explicit or implicit power adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the initial transmit power of a secondary reverse link carrier is set to the current level of the primary reverse link carrier, then the setup is simple, but the transmit power may be too high or too low causing increased interference or reduced connection success
Solution Approach 1:
The base station controller performs preliminary analysis of reverse link loading conditions and computes appropriate power offset values before the mobile station initializes transmission on the secondary carrier. This advance preparation ensures the mobile station receives pre-calculated power offset information that accounts for current network conditions, eliminating the need for trial-and-error power initialization at the mobile station.
Solution Approach 2:
The base station controller acts as an intermediary between the network conditions and the mobile station's transmit power setting. It measures reverse link loading, computes power offset values, and transmits these offsets to the mobile station, which then applies them to initialize its secondary carrier transmit power. This intermediary approach ensures accurate power initialization without requiring complex calculations at the mobile station.
2Ease of operation
If the initial transmit power of a secondary reverse link carrier is set to the current level of the primary reverse link carrier, then the configuration is simple, but unnecessary interference and power wastage occur
Solution Approach 1:
The base station controller dynamically adjusts the transmit power offset parameter for the secondary carrier based on measured reverse link loading conditions. When loading is high, it applies larger negative offsets to reduce power; when loading is low, it applies smaller offsets. This parameter adaptation ensures the mobile station transmits at appropriate power levels, minimizing energy wastage while maintaining connection reliability.
3Measurement precision
If access probing is performed for secondary reverse link carriers, then accurate power initialization is achieved, but additional signaling overhead and delay are introduced
Solution Approach 1:
The base station controller performs preliminary measurement of reverse link loading conditions and pre-computes power offset values before the mobile station needs to initialize transmission on the secondary carrier. By preparing the power offset information in advance and transmitting it to the mobile station, the system eliminates the need for time-consuming access probing procedures, achieving both accurate power initialization and reduced initialization delay.
Data Source
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AI summary
A method and apparatus provide for setting the initial transmit power of secondary reverse link carriers used by mobile stations in conjunction with primary reverse link carriers. In one or more embodiments, a mobile station sets the initial transmit power of a secondary reverse link carrier relative to the transmit power of the primary reverse link carrier as a function of initialization transmit power information transmitted to the mobile station, which directly or indirectly considers reverse link loading information. Additional considerations may include differences in active sets associated with the primary and secondary reverse link carriers and/or sector switching activity of the mobile station.