Telecommunication System Transmit Diversity Multi-User Scheduling
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Solution Overview
Problem
Wireless networks face challenges in efficiently supporting both delay-sensitive low bit rate voice communications and delay-tolerant high bit rate data communications, particularly in managing bursty data traffic and optimizing spectral capacity in multi-user environments.
Innovation Solution
The implementation of a transmit diversity technique using multiple downlink transmit antennas and multi-user diversity scheduling, along with multi-carrier power amplifiers, to efficiently allocate resources and balance transmission power for real-time and non-real-time signals, ensuring symmetric usage of power amplifiers and optimizing spectral efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmit diversity is applied to real-time signals using multiple power amplifiers and antennas, then reliability and signal quality are improved, but device complexity and power consumption increase
Solution Approach 1:
The system segments users into different groups based on their service requirements (real-time vs. non-real-time) and assigns different transmit diversity configurations to each group. This allows the complexity of transmit diversity to be selectively applied only where necessary, rather than uniformly across all users.
Solution Approach 2:
Transmit diversity is applied locally to specific users or user groups based on their channel conditions and service requirements. The system dynamically adjusts which users receive transmit diversity treatment, optimizing the balance between signal quality improvement and system complexity.
2Power
If multiple power amplifiers are used for transmit diversity, then transmission power and signal coverage are improved, but power amplifier usage efficiency deteriorates due to asymmetric load distribution
Solution Approach 1:
The system dynamically balances the load across multiple power amplifiers by adjusting user grouping and signal routing based on current channel conditions and amplifier states. This dynamic adaptation ensures that power amplifiers operate more evenly, improving overall efficiency while maintaining the transmission power benefits of multiple amplifiers.
Solution Approach 2:
The system implements feedback mechanisms to monitor power amplifier usage and adjust user assignments accordingly. By continuously monitoring amplifier load and channel conditions, the system can reallocate users to balance the load across amplifiers, preventing any single amplifier from being overloaded while others remain underutilized.
3Productivity
If users share the same radio resources, then spectral efficiency is improved, but service quality deteriorates due to resource contention between voice and data traffic
Solution Approach 1:
The system segments users into different groups based on their service requirements (real-time voice vs. non-real-time data) and applies different resource allocation strategies to each group. This segmentation allows spectral resources to be efficiently shared while maintaining appropriate service quality guarantees for each user category.
Solution Approach 2:
The system changes operational parameters such as modulation schemes, coding rates, and resource block allocations based on user group and channel conditions. By dynamically adjusting these parameters, the system optimizes spectral efficiency for each user while maintaining service quality, allowing aggressive parameter optimization for delay-tolerant data while preserving robust parameters for real-time voice.
4Reliability
If dedicated channels are allocated for real-time signals, then service quality and continuity are improved, but spectral capacity utilization deteriorates due to fixed resource allocation
Solution Approach 1:
The system dynamically adjusts dedicated channel allocations based on current traffic conditions and user needs. Rather than maintaining fixed dedicated channels for all users at all times, the system activates dedicated channel resources only when and where needed, allowing spectral capacity to be efficiently utilized while maintaining service continuity for real-time applications.
Data Source
AI summary
The present invention relates to a method of sending first and second signals to a plurality of user equipments, the method comprising the steps of providing of a dedicated channel for each one of the plurality of user equipments, providing of a code-multiplexed shared channel for the plurality of user equipments, assigning of an antenna of a set of antennas to each one of the user equipments, sending of one of the first signals to one of the plurality of user equipments on one of the dedicated channels on a carrier frequency by applying transmit diversity, sending of one of the second signals to one of the plurality of user equipments on the code-multiplexed shared channel on the carrier frequency by applying multi-user diversity.