Switching Frame Power Level Management for Cell Sector Transition
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Solution Overview
Problem
The existing R-CQICH proposal in 1x EV-DV systems is not optimal for seamless switching between cells or sectors, leading to errors in receiving channel information and switching indication during cell/sector transitions.
Innovation Solution
A method is introduced to change the source coverage area to a target area by transmitting carrier-to-interference ratio information and up/down command information in a switching frame with specific power levels, enhancing recognition reliability and minimizing errors during cell/sector switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the existing R-CQICH proposal is used for cell/sector switching, then the system supports high-rate packet data service, but error generation occurs in receiving channel information and switching indication during switching
Solution Approach 1:
The patent applies preliminary action by transmitting the switching frame containing target coverage area information and up/down command information before the actual switching occurs. The terminal prepares and sends this information in advance during the transmission of carrier-to-interference ratio, allowing the base transceiver subsystem to have accurate channel information ready before the switch, thereby preventing errors during the switching process.
2Measurement precision
If switching frame is transmitted with specific power levels, then recognition reliability is enhanced, but transmission power management becomes more complex
Solution Approach 1:
The patent applies parameter changes by transmitting the switching frame at a specific power level that is the same as the carrier-to-interference ratio transmission power level. This parameter consistency simplifies power management while ensuring the switching frame is received with sufficient reliability. The up/down command information within the frame also uses consistent power levels, making the transmission process manageable without compromising recognition reliability.
Data Source
AI summary
A switching frame includes information on a carrier-to-interference ratio that is included on a first time slot corresponding to a boundary with a previous frame and corresponds to a target coverage area having a first power level, and at least on up/down command information for the carrier-to-interference ratio that is included after the first time slot and has the same power level as the first power level.