Dynamic Ranging Period Adjustment in Wireless Access Terminals
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Solution Overview
Problem
Conventional ranging methods in wireless communication systems are inefficient as they do not dynamically adjust to changing radio environments, leading to transmission parameter errors and collisions in CDMA code transmissions, especially when access terminals move rapidly.
Innovation Solution
An access terminal dynamically adjusts its ranging period based on estimated downlink channel conditions, controlling transmission power, timing, and frequency offset by resetting the ranging period according to the channel conditions, thereby improving the accuracy of data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If ranging is performed at fixed intervals, then the system structure is simple and easy to implement, but transmission parameter control accuracy deteriorates when the access terminal moves rapidly
Solution Approach 1:
The patent applies the dynamics principle by making the ranging period variable rather than fixed. The access terminal dynamically adjusts the ranging period based on its movement speed and channel conditions, transitioning from a static system to a dynamic one that adapts to changing environmental conditions, thereby resolving the contradiction between implementation simplicity and control accuracy.
Solution Approach 2:
The patent changes the parameter of ranging period from a fixed value to a variable that adjusts based on movement speed and channel quality. By modifying this key parameter dynamically, the system achieves both ease of operation (through automated adjustment) and improved measurement precision (through adaptive timing), directly resolving the technical contradiction.
2Use of energy by moving object
If ranging period is extended to reduce ranging frequency, then energy consumption decreases, but transmission parameter accuracy deteriorates in rapidly changing environments
Solution Approach 1:
The patent implements dynamic adjustment of the ranging period based on movement speed and channel conditions. When movement is slow or channel conditions are stable, the ranging period is extended to reduce energy consumption. When movement is rapid or conditions change frequently, the period is shortened to maintain accuracy, thus resolving the contradiction between energy efficiency and reliability.
Solution Approach 2:
The system changes the ranging period parameter dynamically based on measured movement speed and channel quality. This parameter adjustment allows the system to optimize the trade-off between energy consumption and transmission parameter accuracy, achieving both energy efficiency and reliability under different operating conditions.
3Measurement precision
If ranging is performed frequently to maintain accuracy, then transmission parameter control improves, but system resource waste increases due to unnecessary ranging when terminal is stationary
Solution Approach 1:
The patent makes the ranging frequency dynamic by adjusting the ranging period based on detected movement and channel conditions. When the terminal is stationary or moving slowly, the ranging period is extended or ranging is suspended, reducing resource waste. When movement is detected or accuracy requirements increase, ranging frequency increases accordingly, resolving the contradiction between precision and resource efficiency.
Solution Approach 2:
The system dynamically changes the ranging period parameter based on movement speed and channel quality metrics. This parameter adaptation allows the system to perform ranging frequently only when necessary for accuracy, while reducing or eliminating unnecessary ranging operations when the terminal is stationary, thereby resolving the contradiction between measurement precision and energy loss.
4Device complexity
If fixed ranging intervals are used, then device complexity is low, but adaptability to changing wireless environments deteriorates
Solution Approach 1:
The patent transforms the static ranging mechanism into a dynamic one that automatically adapts to changing wireless environments. By introducing movement detection and channel quality assessment that drive ranging period adjustment, the system gains environmental adaptability while maintaining relatively simple device complexity through automated decision-making algorithms.
Solution Approach 2:
The system changes the ranging period parameter dynamically based on environmental conditions such as movement speed and channel quality. This parameter adaptation enables the system to adapt to varying wireless environments without significantly increasing device complexity, as the changes are driven by straightforward measurements and pre-defined adjustment rules.
Data Source
AI summary
A ranging method of an access terminal that requests a ranging to an access point through a wireless network and performs the ranging, the ranging method including a) initializing a ranging period, b) setting a timer with the ranging period and starting the timer, c) requesting a ranging by transmitting a given ranging code to the access point based on radio resource allocation information provided by the access point, d) receiving a ranging response message from the access point, and controlling transmission power, timing, and frequency offset of an access terminal according to transmission parameters included in the received ranging response message, e) estimating a downlink channel condition through which a signal from the access point is transmitted, f) resetting the ranging period according to the estimated downlink channel condition, and g) iteratively performing b) to f) according to the reset ranging period.