Center Frequency Control in Multi-Carrier Wireless Systems
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Solution Overview
Problem
Current wireless access systems face inefficiencies in transmitting and receiving system information in multicarrier systems, particularly in adjusting neighbor subcarriers and configuring carrier information, leading to high power consumption and inability to support varying bandwidth requirements.
Innovation Solution
A method and apparatus for adjusting the center frequency of carriers in a multicarrier environment, involving a control message with parameters for carrier configuration and center frequency adjustment, enabling efficient transmission and reception of system information and configuration in a wireless access system that supports multiple carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If bandwidth is increased to increase transmission capacity, then transmission efficiency is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic bandwidth adjustment where the base station can allocate different bandwidths to mobile stations based on their current service requirements. Instead of all mobile stations using maximum bandwidth continuously, the system dynamically adapts the bandwidth allocation, allowing high transmission capacity when needed while reducing power consumption when lower bandwidth suffices for the current service level.
2Productivity
If multiple carriers are aggregated to support wideband, then transmission efficiency is improved, but system complexity increases
Solution Approach 1:
The patent divides the wideband spectrum into multiple separate carriers that can be independently configured and managed. Each carrier can be allocated to different mobile stations based on their requirements, allowing the system to achieve wideband transmission efficiency while managing complexity through modular carrier-level configuration rather than monolithic wideband management.
Solution Approach 2:
The patent creates a universal carrier aggregation framework where multiple carriers with different bandwidths can be combined to serve various service requirements. The same base station infrastructure can support multiple carrier configurations simultaneously, providing multi-functionality that handles both narrowband and wideband services through a unified system approach.
3Manufacturing precision
If center frequency adjustment is implemented for carrier aggregation, then neighbor subcarrier alignment is improved, but control message complexity increases
Solution Approach 1:
The patent introduces center frequency adjustment parameters in control messages that allow precise tuning of carrier frequencies to align neighbor subcarriers. By modifying frequency parameters in the control information, the system achieves accurate subcarrier alignment across aggregated carriers while keeping the control message structure relatively simple through parameter-based configuration rather than complex reconfiguration protocols.
Data Source
AI summary
The present invention relates to a method and an apparatus that supports a multi-carrier wireless access system for transmitting and receiving system information. The 1st embodiment of the present invention is a method for controlling a center frequency in a wireless access system comprising the steps of: receiving a control message including a 1st parameter which indicates a configuration of carrier groups and a 2nd parameter which indicates whether the center frequency is controlled from a base station; deriving the center frequency of carriers allocated to a mobile terminal by using the 1st parameter; and controlling the center frequency by using the 2nd parameter.