Control and Data Channel Power Allocation in LTE
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Solution Overview
Problem
In mobile communication systems, especially in LTE networks, the existing multiplexing schemes for control and data channels are not flexible enough to efficiently manage resource utilization as the number of user equipment (UEs) varies, leading to limitations in control channel capacity and data channel capacity, particularly in scenarios with a large number of connected UEs.
Innovation Solution
A method and apparatus for transmitting signals that involve allocating different power levels to control and data signals, superimposing them, and transmitting these signals using a single sub-carrier in a specific time duration, with a scheduler determining the power levels and a multiplexing module combining these signals, while a receiver detects and separates the signals using interference cancellation techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional separate multiplexing schemes are used for control and data channels, then the system structure is simple and easy to implement, but the resource utilization efficiency deteriorates when the number of UEs varies significantly
Solution Approach 1:
The patent merges control channels and data channels into a unified multiplexing framework where both channel types share the same time-frequency resources. The base station dynamically allocates resources and adjusts power levels for control and data signals within a single scheduling decision, eliminating the need for separate multiplexing schemes and improving resource utilization efficiency.
Solution Approach 2:
The patent introduces dynamic power allocation and resource scheduling that adapts to the varying number of connected UEs. The base station adjusts control signal power and data signal power dynamically based on channel conditions, UE locations, and traffic demands, allowing the system to optimize resource utilization in real-time without fixed structural constraints.
2Reliability
If more power is allocated to control channels to improve control channel capacity, then control signal detection reliability improves, but data channel capacity deteriorates due to limited total power
Solution Approach 1:
The patent changes the power allocation parameter dynamically rather than using fixed power distribution. The base station adjusts control signal power and data signal power as variable parameters based on channel conditions, UE requirements, and system load, allowing optimal balance between control reliability and data capacity under different operating conditions.
Solution Approach 2:
The patent applies different power levels to different spatial locations and channel conditions. Control signals destined for cell-edge UEs receive higher power allocation, while UEs with good channel conditions receive lower control power but higher data power. This localized quality adjustment optimizes both control reliability for vulnerable UEs and overall data capacity.
3Adaptability or versatility
If the number of connected UEs increases, then the system serves more users, but the control channel capacity and data channel capacity become insufficient with existing multiplexing schemes
Solution Approach 1:
The patent creates a universal resource allocation framework that handles both control channels and data channels through a single scheduling mechanism. This multi-functional approach allows the system to efficiently manage resources for any number of UEs, adapting to varying system load without requiring separate specialized schemes for control and data transmissions.
Data Source
AI summary
A transmitting method, a transmitter, a receiver and an associated scheduling method for control signal and data signal are provided. The transmitting method includes following steps. Firstly, a first control power and a first data power are respectively allocated to a first control signal and a first data signal which are to be transmitted with a first sub-carrier in a first time duration. The first control power and the first data power are different. The first control signal and the first data signal are multiplexed by superimposing the first control power and the first data power before the multiplexed first control signal and the multiplexed first data signal are transmitted.