Reverse Link Power Control for Multi-Carrier Wireless Systems
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Solution Overview
Problem
In wireless communication systems, particularly in CDMA systems, determining the initial transmit power for secondary reverse link carriers when establishing a connection is challenging, as existing methods rely on access probes on a single reverse link carrier, lacking a systematic approach to set power levels for multiple carriers.
Innovation Solution
The method involves computing power differentials between primary and secondary reverse link carriers, adjusting the power levels of secondary reverse link carriers by adding the forward link power differential and reverse link power or load differential to the primary reverse link carrier pilot power, ensuring optimal power allocation across multiple carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If access probes are used on a single reverse link carrier to determine initial transmit power, then the connection establishment process is simple, but the power level setting for multiple carriers becomes inadequate and imprecise
Solution Approach 1:
The patent applies preliminary action by pre-configuring power differentials between primary and secondary reverse link carriers before connection establishment. The access terminal stores power differential information in advance, allowing it to compute appropriate power levels for multiple carriers without requiring complex real-time measurements during the connection setup process.
Solution Approach 2:
The patent uses power differential information as an intermediary parameter to bridge the gap between single-carrier access probes and multi-carrier power control. This intermediary enables the access terminal to translate single-carrier power measurements into appropriate multi-carrier power settings by adding predetermined power differentials, thus achieving precise power control without direct multi-carrier measurements.
2Reliability
If power levels for secondary reverse link carriers are not systematically set, then the connection setup is faster, but interference increases and system performance deteriorates
Solution Approach 1:
The patent applies parameter changes by systematically adjusting power levels of secondary reverse link carriers based on predetermined power differentials. The access terminal modifies the power parameter for each carrier according to its specific characteristics and relationship with the primary carrier, thereby reducing interference and improving connection efficiency simultaneously.
3Object-generated harmful factors
If a systematic power control method for multiple carriers is implemented, then power distribution is optimized and interference is reduced, but the complexity of power control increases
Solution Approach 1:
The patent applies segmentation by dividing the power control problem into independent carrier-specific components. Each secondary reverse link carrier is controlled independently using its own power differential parameters, allowing the complex multi-carrier power control to be segmented into manageable single-carrier adjustments based on predetermined relationships.
Data Source
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AI summary
In one embodiment, the patent application comprises an apparatus, method and means for controlling power of an access terminal by adjusting a power of at least one secondary reverse link carrier by computing a forward link power differential, computing a reverse link power differential, and adding a power level of a primary reverse link carrier pilot with the forward link power differential and the reverse link power differential. In another embodiment, the patent application comprises an apparatus, method and means for controlling power of an access terminal by adjusting a power of at least one secondary reverse link carrier by computing a forward link power differential, computing a reverse link load differential, and adding a power level of a primary reverse link carrier pilot with the forward link power differential and the reverse link load differential.