Mobile Station E-DPDCH Transmission for Base Station Cost Reduction
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Solution Overview
Problem
Conventional mobile communication systems with Enhanced Uplink require unnecessary equipment costs due to the need for dedicated physical data channel (DPDCH) despreading at the radio base station even when no transmission data blocks are being transmitted, affecting communication quality.
Innovation Solution
A mobile communication method where the mobile station transmits a dedicated physical control channel without retransmission control and a retransmission-control applied dedicated physical data channel with a predetermined offset, configured to contain only a control header and error detection code when no data is being transmitted, allowing the radio base station to control transmission power based on reception quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile station transmits all transmission data blocks using the enhanced dedicated physical data channel (E-DPDCH), then the communication quality can be stabilized, but the equipment cost increases due to the need for DPDCH despreader at the radio base station
Solution Approach 1:
The invention extracts the essential function of the E-DPDCH by transmitting only the control header and CRC code when no transmission data blocks are present, eliminating the need for the DPDCH despreader at the base station while maintaining communication quality stabilization through the E-DPDCH's retransmission control capabilities
Solution Approach 2:
The E-DPDCH is designed to serve multiple purposes: it carries transmission data blocks when present and transmits only control information when absent, replacing the need for separate DPDCH transmissions and enabling the base station to maintain communication quality without requiring full DPDCH reception capabilities
2Reliability
If the mobile station transmits the dedicated physical data channel (DPDCH) constantly to stabilize communication quality, then the communication quality is improved, but the transmission power is increased unnecessarily
Solution Approach 1:
The mobile station transmits the E-DPDCH periodically at predetermined cycles, transmitting only control headers when no data blocks are present, rather than constantly transmitting full DPDCH signals, thereby reducing unnecessary transmission power while maintaining communication quality through periodic retransmission control
Data Source
AI summary
A mobile communication method according to the present invention includes: transmitting, from a mobile station, a retransmission-control applied dedicated physical data channel to which a retransmission control processing is applied and which is configured not to contain any transmission data blocks, when there is no transmission data block that should be transmitted, at a predetermined cycle, with a transmission power having a predetermined offset relative to a transmission power of a dedicated physical control channel; generating, by a radio base station, transmission power control information for controlling a transmission power of the dedicated physical control channel, by a closed-loop power control based on a reception quality of the dedicated physical control channel, and by an outer-loop power control based on a reception quality of the retransmission-control applied dedicated physical data channel, and transmitting the transmission power control information to the mobile station; and determining, by the mobile station, the transmission power of the dedicated physical control channel, based on the transmission power control information, and transmitting, from the mobile station, the dedicated physical control channel to which the re-transmission control processing is not applied with the determined transmission power.