Uplink Power Control for Wireless Handover Ranging
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Solution Overview
Problem
In IEEE 802.16 wireless access systems, determining optimal uplink transmit power during handover or zone switch is challenging, leading to potential signal interference or loss, as the default power may not suit the channel environment, causing unnecessary delays and inefficiencies.
Innovation Solution
A method involving the use of power control parameters, such as Interference over Thermal value of Frequency Partition (iotFP) and offsetControl, is applied to efficiently determine and adjust uplink transmit power during handover and zone switch processes, using MAC management messages like handover commands and ranging responses to facilitate accurate power control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If default transmit power is used during handover or zone switch, then the handover process can be completed, but signal interference or loss may occur and the process efficiency is reduced
Solution Approach 1:
The patent applies preliminary action by having the target base station pre-calculate and provide power control parameters (such as iotFP and offsetControl) to the mobile station before the actual handover or zone switch occurs. This allows the mobile station to determine the optimal transmit power in advance, ensuring reliable signal transmission while avoiding the inefficiencies of trial-and-error power adjustment during the handover process itself.
2Reliability
If transmit power is increased to ensure signal quality, then signal reliability improves, but unnecessary delays and energy consumption increase
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the transmit power parameters (iotFP and offsetControl) based on the specific channel environment and handover conditions. Instead of using fixed or overly conservative power levels, the system calculates optimal parameter values that match the actual transmission requirements, thereby ensuring signal quality while minimizing unnecessary delays and energy consumption.
3Ease of operation
If power control parameters are not optimized, then the handover procedure is simple, but transmit power determination is inaccurate leading to interference or loss
Solution Approach 1:
The patent introduces an intermediary mechanism where the target base station acts as a mediator to calculate and provide power control parameters to the mobile station. This intermediary approach maintains the simplicity of the handover procedure from the mobile station's perspective while achieving accurate transmit power determination through the target base station's calculation capabilities, thus resolving the contradiction between operational simplicity and measurement precision.
Data Source
AI summary
The present invention relates to a broadband wireless access system, and more particularly, to a method for efficiently determining power for ranging performed by a terminal on a target base station or a target region during handover or during changing of a region. A method for controlling uplink power for network reentry of a terminal from a first region to a second region in a broadband wireless access system, according to an embodiment of the present invention, comprises the steps of: receiving a media access control (MAC) management message including a power control parameter that is to be applied to the second region from the first region; and performing ranging to the second region by applying the power control parameter.