Multi-slot Packet Data Transfer for BSIC Decoding
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Solution Overview
Problem
In GSM/EDGE wireless communication systems, mobile stations in certain multislot configurations face challenges in completing BSIC decoding within the allotted time, leading to data transmission skips that can corrupt radio blocks during the extended search window, compromising data integrity.
Innovation Solution
The multislot packet data transfer method alters the transmission of the last radio block timeslot before the idle frame by either skipping, replacing with dummy bursts, changing power levels, or using a different coding scheme, based on criteria such as RLC mode, coding robustness, path loss, and interference levels, to extend the search window while minimizing data corruption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile station extends the search window by skipping the last transmission burst in the frame immediately preceding the idle frame to complete BSIC decoding, then the BSIC decoding capability is improved, but the data transmission integrity deteriorates due to potential radio block corruption
Solution Approach 1:
The mobile station identifies in advance whether it is in a multislot configuration that prevents normal BSIC decoding. When such a condition is detected, the system proactively alters the transmission of the last radio block timeslot before the idle frame (by skipping, replacing with dummy bursts, changing power levels, or using different coding schemes) to prevent radio block corruption before it occurs, rather than attempting to recover from corruption after the fact.
Solution Approach 2:
The system dynamically changes transmission parameters for the last radio block timeslot before the idle frame based on the detected multislot configuration. This includes altering coding schemes, power levels, or replacing data bursts with dummy bursts, thereby adapting the transmission strategy to the specific condition where extended search window is required, preventing corruption while maintaining data integrity.
2Duration of action of moving object
If the mobile station skips transmission bursts to extend the search window for BSIC decoding, then the search window duration is improved, but the data transmission efficiency deteriorates
Solution Approach 1:
The system proactively identifies when extended search window is needed based on multislot configuration detection, and preemptively alters the last radio block transmission before the idle frame. This prevents the need for retransmissions that would otherwise be required if radio block corruption occurred, thereby maintaining data transmission efficiency while still extending the search window duration when necessary.
3Speed
If the mobile station uses non-robust coding schemes to maximize data transfer speed, then the data transfer speed is improved, but the susceptibility to radio block corruption increases
Solution Approach 1:
The system applies different transmission strategies to different parts of the data transmission process. Specifically, for the last radio block timeslot before the idle frame, the system alters transmission parameters (such as using more robust coding, changing power levels, or replacing with dummy bursts) while maintaining normal non-robust coding schemes for all other transmission timeslots. This localized adaptation protects against corruption only where the extended search window creates vulnerability, preserving overall data transfer speed while preventing corruption at the critical point.
Data Source
AI summary
A multislot packet data transfer method (300) for a mobile station alters a transmission (370) of a radio block on a last transmission timeslot in a block period (320) immediately preceding an idle frame when the mobile station is in an allowed multislot configuration yet not able to perform normal Base Station Identification Code (BSIC) decoding. The method (300) also skips a last transmission burst in a frame immediately preceding an idle frame (330) in accordance with known extended search window techniques. The method contemplates various criteria (340) for determining when to alter the radio block, which include: whether an unacknowledged radio link control mode is used (350) and whether a robust coding scheme is used (360). The transmission can be altered (370) by completely skipping transmission of the radio block, by replacing the radio block on the last transmission timeslot with at least one dummy burst, by changing a transmission power level of that radio block, and/or by using a different coding scheme for that radio block.