OFDM Control Channel Resource Allocation for Interference Reduction
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Solution Overview
Problem
Current mobile communication systems face challenges in transmitting control channel signals efficiently due to increased interference between base stations, particularly in LTE-A systems, which affects the ability to provide high-speed data services and requires innovative methods to manage frequency resources effectively.
Innovation Solution
The proposed method involves configuring physical resource blocks (PRBs) for control channel signals in an OFDM communication system by assigning specific resource elements in both the time and frequency domains, allowing for both distributed and frequency-selective transmission of control channel signals, thereby reducing interference and optimizing resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If control channel signals are transmitted using all frequency bandwidths in LTE, then complete frequency resource utilization is achieved, but interference between base stations increases
Solution Approach 1:
The patent divides the frequency bandwidth into multiple resource blocks (RBs), each consisting of multiple resource elements (REs). Control channel signals are transmitted using only specific REs within selected RBs rather than all frequency resources, thereby segmenting the frequency spectrum to reduce inter-base station interference while maintaining efficient resource utilization.
Solution Approach 2:
The patent assigns control channel signals to specific local frequency resources (certain REs within RBs) rather than uniformly distributing them across all frequency bandwidth. This localized allocation allows each base station to use specific frequency portions, reducing interference while maintaining overall system efficiency.
2Ease of operation
If control channel signals are transmitted through dedicated control channel regions, then signal transmission is simplified, but resource flexibility and adaptability to various channel circumstances are reduced
Solution Approach 1:
The patent enables control channel signals to be transmitted through both dedicated control channel regions and data channel regions. This multi-functional approach allows the same transmission mechanism to serve different purposes: dedicated regions provide simplicity while data channel regions provide adaptability to various channel circumstances and interference conditions.
Solution Approach 2:
The patent introduces dynamic selection of transmission regions based on channel conditions, interference levels, and scheduling requirements. The base station can flexibly choose whether to transmit control channel signals in dedicated control regions or data channel regions, adapting to varying operational circumstances rather than being constrained to a fixed transmission method.
3Reliability
If control channel signals are transmitted using distributed transmission methods, then interference diversity is improved, but maintaining consistent coding rates across different transmission methods becomes difficult
Solution Approach 1:
The patent carefully controls the number and distribution of resource elements allocated to control channel signals in both distributed and frequency-selective transmission modes. By adjusting parameters such as the number of REs per RB, the spacing between allocated REs, and the selection criteria for active REs, the system maintains consistent effective coding rates across different transmission methods while achieving interference diversity.
Data Source
AI summary
The present invention is a method in which a base station transmits a control channel signal in an orthogonal frequency division multiplexing (OFDM) communication system, wherein the method configures a physical resource block (PRB) from multiple resource elements (REs) for a control channel signal for scheduling, allocates at least one RE to a response channel signal, the at least one RE occupying the time domain the same as that of the RE used in a resource signal transmission in a data channel region of the PRB and occupying the frequency domain nearest to the RE used in the reference signal transmission, and transmits the control channel signal for scheduling and the response channel signal.