Radio Communication Method Using Frequency Diversity for Throughput Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
CDMA radio communications systems face throughput deterioration due to deteriorating radio propagation environments, particularly when using shared physical channels like HS-PDSCH, leading to delayed or stopped data transmission between base stations and mobile stations.
Innovation Solution
Implementing a method where error detecting codes are attached to data pieces and transmitted using different radio frequencies, with error detection results used to manage retransmissions, ensuring that even if one physical channel's radio propagation environment deteriorates, the throughput of another channel remains stable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If data is transmitted using shared physical channels like HS-PDSCH, then communication speed is improved, but throughput deteriorates when radio propagation environment worsens
Solution Approach 1:
The patent segments data transmission into multiple independent physical channels (first physical channel and second physical channel) operating on different radio frequencies. This segmentation allows the system to transmit data through multiple paths, so if one channel experiences propagation deterioration, the other channel can maintain throughput, thus resolving the contradiction between high speed and reliable transmission.
Solution Approach 2:
The patent changes the radio frequency parameter by using different frequencies for different physical channels. This parameter change enables the system to exploit frequency diversity, where channels on different frequencies experience different propagation conditions, thereby maintaining overall throughput stability even when one channel deteriorates.
2Reliability
If error detecting codes are attached to each data piece and transmitted on different frequencies, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent applies universal error detection mechanisms (error detecting codes) across multiple physical channels. The same error detection and retransmission logic is reused for each channel, which manages complexity by using a standardized approach rather than implementing separate complex error handling for each channel.
Solution Approach 2:
The patent implements feedback mechanisms where error detection results are reported back to the transmitting station, which then controls retransmissions. This feedback loop automates error handling and maintains reliability without requiring complex manual intervention or overly sophisticated error correction codes.
3Reliability
If multiple physical channels are used for data transmission, then throughput stability is improved, but loss of time increases due to coordination overhead
Solution Approach 1:
The patent attaches error detecting codes to data pieces before transmission on multiple channels. This preliminary action enables the receiving station to independently verify data integrity on each channel without requiring complex real-time coordination, thereby reducing time loss while maintaining throughput stability.
Data Source
AI summary
A transmitting station includes: an error detecting code attachment block that attaches error detecting codes respectively to a plurality of data pieces; a transmitter block that transmits the plurality of data pieces with the error detecting codes attached thereto to a receiving station by using different radio frequencies, respectively; a receiver block that receives, from the receiving station, the results of error detections that the receiving station applies respectively to the plurality of data pieces on the basis of the error detecting codes attached respectively to the plurality of data pieces; and a transmission data managing block that controls retransmission of the data to the receiving station on the basis of the received results of the error detection.