Wireless Transmitter Polling Mechanism for Buffer Status
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communications systems, particularly in UMTS, transmitters face errors and inefficiencies when all Protocol Data Units (PDUs) in the buffer are discarded before acknowledgment, leading to unsuccessful polling and unnecessary polls, which reduces transmission efficiency and wastes system resources.
Innovation Solution
The method involves determining whether there are PDUs that have been transmitted but not discarded and not yet acknowledged, and only initiating a polling procedure if such PDUs exist, thereby avoiding the selection of discarded PDUs for polling and preventing unnecessary polls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmitter continuously polls the receiver for status reports, then data robustness is improved, but transmission efficiency deteriorates due to unnecessary polls when all PDUs are discarded
Solution Approach 1:
The transmitter checks whether any PDU remains in the buffer before initiating a poll. This preliminary check prevents the transmitter from sending polls when all PDUs have been discarded, thereby avoiding unnecessary transmissions and improving overall transmission efficiency while maintaining data robustness through selective polling
2Ease of operation
If the transmitter selects a PDU for polling from the buffer, then the polling procedure is executed successfully, but an error occurs when all PDUs are discarded before acknowledgment
Solution Approach 1:
The transmitter performs a preliminary check to determine whether any PDU remains in the buffer before attempting to select a PDU for polling. This preliminary anti-action prevents the error condition where the transmitter tries to select a PDU from an empty buffer, ensuring reliable polling procedure execution by avoiding invalid operations
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A method for polling transmission status in a wireless communications system includes determining whether a buffer of a transmitter contains at least a packet that has been transmitted, has not been discarded, and has not yet been acknowledged when there is no packet scheduled for transmission or retransmission while a polling procedure is triggered and is not prohibited, selecting a packet in order to transmit a poll, and scheduling the selected packet for retransmission.