CDMA Multiplexing Power Fluctuation Control
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Solution Overview
Problem
CDMA systems face challenges in efficiently multiplexing high-speed packet data transmission with voice/data transmission, leading to degradation in signal quality due to fluctuating transmit power, which affects the performance of voice/data services.
Innovation Solution
The method involves partitioning transmission intervals into voice/data and packet data partitions, with dynamic allocation based on load, and controlling transmit power to maintain a stable range, allowing efficient resource utilization and minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-speed packet data transmission is multiplexed with voice/data transmission in a CDMA system, then system productivity and resource utilization are improved, but transmit power fluctuation increases causing degradation in voice/data service quality
Solution Approach 1:
The transmission interval is divided into multiple slots, with certain slots allocated for voice/data transmission and other slots for packet data transmission. This time-division multiplexing approach segments the transmission resources to accommodate both service types while controlling interference between them
Solution Approach 2:
The system dynamically adjusts the allocation of transmission slots between voice/data and packet data services based on current traffic conditions and channel quality. This dynamic resource allocation optimizes system productivity while maintaining service quality through adaptive control
2Speed
If transmit power is increased to support high-speed packet data transmission, then data transmission rate is improved, but interference to other transmissions increases degrading overall system performance
Solution Approach 1:
Packet data transmission is organized into periodic transmission bursts separated by idle periods or low-power periods. This periodic transmission pattern allows the system to achieve high data rates during active transmission while reducing average transmit power and interference during idle periods
Solution Approach 2:
The system dynamically changes transmit power parameters based on transmission type and channel conditions. High power is used only when necessary for packet data bursts, while voice/data transmissions use lower, more stable power levels, thus achieving high data rates without excessive interference
Data Source
AI summary
Techniques for transmitting voice/data and packet data services such that packet data transmissions have less impact on voice/data transmissions. In one aspect, voice/data and packet data can be multiplexed within a transmission interval such that the available resources are efficiently utilized. In another aspect, the amount of variation in the total transmit power from a base station is controlled to reduce degradation to transmissions from this and other base stations. In a specific method for concurrently transmitting a number of types of data, a first data type (e.g., voice, overhead, and some data) and a second data type are respectively processed in accordance with first and second signal processing schemes to generate first and second payloads, respectively. First and second partitions are then defined in a transmission interval. The first and second payloads are time multiplexed into the first and second partitions, respectively, and the multiplexed payloads are transmitted.