Mobile Station Scheduling Request Transmission for Uplink Sync
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Solution Overview
Problem
In next-generation mobile communication systems, base stations face challenges in synchronizing with multiple mobile stations during uplink packet transmission, leading to delays when mobile stations need to resynchronize their scheduling requests outside of data communication periods.
Innovation Solution
A mobile communication system that allows mobile stations to transmit scheduling requests without uplink data transmission, maintaining synchronization through dedicated channels or CQI report channels, enabling synchronization during periods of no data communication and reducing delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile station transmits scheduling request only together with uplink data, then the base station can synchronize with the mobile station during data transmission, but the mobile station cannot maintain synchronization during periods of no data communication, causing resynchronization delay when data transmission is needed
Solution Approach 1:
The mobile station transmits scheduling requests periodically during periods of no data communication to maintain synchronization in advance. This preliminary action ensures that when uplink data needs to be transmitted, the mobile station is already synchronized, eliminating resynchronization delay.
Solution Approach 2:
The scheduling request transmission is made continuous by sending it periodically even when no uplink data is present. This continuous action maintains the synchronization link between mobile station and base station, ensuring readiness for immediate data transmission when needed.
2Reliability
If the mobile station transmits scheduling request periodically during no data communication, then synchronization is maintained, but additional transmission overhead is introduced
Solution Approach 1:
The scheduling request is merged with existing uplink transmissions such as CQI reports or random access signals. By combining multiple functions into a single transmission, the patent avoids separate dedicated scheduling request transmissions, thereby reducing overall transmission overhead while maintaining synchronization.
Solution Approach 2:
The scheduling request mechanism is designed to serve multiple purposes: it can be transmitted alongside CQI reports, random access signals, or other uplink control information. This multi-functionality allows the same transmission infrastructure to handle both data scheduling and synchronization maintenance, reducing the need for separate overhead channels.
Data Source
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AI summary
A base station determines both a transmission interval between scheduling requests which a mobile station transmits before transmitting uplink data and information about radio resources used for transmitting the scheduling requests, based on the status of the mobile station and/or QoS information transmitted from the mobile station. The mobile station generates the scheduling requests. The mobile station controls the transmission of the scheduling requests based on the transmission interval and the radio resources. The mobile station transmits the scheduling requests. The base station detects correlation based on the scheduling requests which are transmitted from the mobile station based on the transmission interval and the radio resources, and feeds delay information back to the mobile station. The mobile station maintains synchronization based on the delay information transmitted from the base station.