Relay Signal Remodulation for Low-Cost Wireless Coverage Extension
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Solution Overview
Problem
The existing relay station systems for wireless Internet require a large number of base stations, leading to high installation costs, and existing technologies struggle to reduce these costs while maintaining compatibility and improving throughput.
Innovation Solution
A method of signal transmission that involves encoding and modulating signals with different modulation methods while maintaining a predetermined code rate, allowing for efficient data block creation and transmission through relay stations, thereby reducing the need for costly infrastructure and simplifying the system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If relay stations use existing base station systems without changes, then system compatibility is maintained, but installation cost and system complexity increase
Solution Approach 1:
The patent segments the base station functionality into two parts: the core base station system remains unchanged for compatibility, while the relay station implements a simplified subset of functions. The relay station performs only signal reception, demodulation, and retransmission without needing full base station capabilities, thereby reducing complexity while maintaining compatibility.
Solution Approach 2:
The relay station creates a simplified copy of base station functionality. Instead of deploying full base station systems everywhere, the relay station copies only the essential signal transmission and reception functions, using the same modulation and demodulation methods as base stations but without the complete base station infrastructure.
2Ease of manufacture
If relay stations use simplified modulation methods, then installation cost is reduced, but transmission efficiency may be compromised
Solution Approach 1:
The patent changes the operational parameters of the relay station by using the same code rates and modulation methods as the base station. This allows the relay station to maintain transmission efficiency equivalent to base station levels while using simpler hardware implementation, thus reducing installation cost without sacrificing productivity.
3Area of stationary object
If more base stations are deployed to expand wireless Internet coverage, then service coverage is improved, but installation and maintenance cost increases
Solution Approach 1:
The patent introduces the relay station as an intermediary between the base station and mobile stations. The relay station extends the coverage area of existing base stations by receiving signals and retransmitting them to distant mobile stations, thereby expanding service coverage without requiring additional full-scale base stations.
Solution Approach 2:
The relay station extends coverage in a dimensional sense by creating an intermediate transmission layer. Instead of adding more base stations in the same infrastructure dimension, the relay station adds a signal relay dimension, allowing coverage expansion through multi-hop transmission paths.
Data Source
AI summary
A method of transmitting a signal according to the present invention includes: receiving a signal that is encoded with a predetermined code rate and that is modulated by a first modulation method from a base station; creating a signal that is obtained by demodulating the signal that is modulated by the first modulation method using a method corresponding to the first modulation method; creating a signal that is obtained by modulating the demodulated signal using a second modulation method while maintaining the predetermined code rate; and transmitting the signal that is modulated by the second modulation to a mobile station.Therefore, it is possible to reduce the cost of the relay station and simplify the system of the relay station. Further, during the modulation and demodulation, the symbol offset is changed to create various modulated and demodulated signals.