Multi-Cell Transmission Data Frame With Cyclic Prefix For Delay Compensation
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Solution Overview
Problem
In cooperative reception schemes, base stations face challenges in accurately receiving data from terminals due to significant transmission delays, which can lead to incomplete or erroneous data signals, especially when terminals are farther away from the cooperative base stations.
Innovation Solution
The terminal generates multi-cell transmission data by repeating data groups and includes a cyclic prefix signal, which is time-division multiplexed with the data to create an uplink frame. This frame is transmitted to multiple base stations, allowing them to set window durations based on transmission delays to restore missing data bits using OFDM modulation and Fourier transformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If base stations use cooperative reception to receive data from terminals, then data reception reliability is improved, but transmission delay increases causing incomplete data signals
Solution Approach 1:
The patent applies preliminary action by inserting a cyclic prefix (CP) signal before the actual data transmission. The CP is generated in advance using at least one bit of the data bits and contains preliminary information about transmission conditions. This allows base stations to prepare for delay compensation before the main data arrives, enabling them to accurately reconstruct the complete data signal even when transmission delays occur during cooperative reception.
Solution Approach 2:
The cyclic prefix acts as an intermediary element between the data bits and the reception process. It mediates the transmission delay issue by providing base stations with reference information that enables them to synchronize and combine signals from multiple base stations accurately, thus resolving the delay problem while maintaining cooperative reception benefits.
2Area of stationary object
If base stations receive data from distant terminals in cooperative reception, then coverage area is improved, but data accuracy deteriorates due to transmission delays
Solution Approach 1:
By pre-inserting the cyclic prefix containing delay compensation information before data transmission, distant terminals can maintain data accuracy even when signals travel longer distances. The base stations use this preliminary information to correct for the extended transmission delays inherent in covering larger areas.
Solution Approach 2:
The patent changes the parameter structure of the transmitted signal by embedding delay compensation information in the cyclic prefix. This allows base stations to adapt to varying transmission delays based on distance, maintaining data accuracy across different coverage areas by adjusting their reception parameters using the CP information.
3Loss of information
If base stations continuously receive data over the entire transmission period to ensure complete data reception, then data completeness is improved, but power consumption increases
Solution Approach 1:
The cyclic prefix enables the reception system to be self-sufficient by containing all necessary information for delay compensation and data reconstruction. Base stations can use the CP information to determine exactly when to start and stop receiving data, allowing them to complete data reception without continuous monitoring throughout the entire transmission period, thus reducing power consumption while ensuring data completeness.
Solution Approach 2:
The patent extracts the essential delay compensation information into a separate cyclic prefix component. This allows base stations to process only the necessary portions of the signal using the CP as a reference, rather than continuously processing the entire transmission period, thereby reducing power consumption while maintaining complete data reception.
Data Source
AI summary
A communication system and method that receives data from a terminal using a cooperative reception scheme, is provided. Each terminal may generate multi-cell transmission data used for overcoming transmission delay and transmit, to each base station, a data frame including the multi-cell transmission data.