Polling Transmission Status in Wireless Systems
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Solution Overview
Problem
In wireless communications systems, particularly in 3G mobile telecommunications using WCDMA, the existing methods for polling transmission status can cause unnecessary retransmissions and increase transmission latency due to inefficiencies in the POLL SUFI scheme, which sets the Poll_SN field based on Configured_Tx_Window_Size, leading to delayed retransmissions and resource wastage.
Innovation Solution
A method and apparatus that form a status protocol data unit with a Poll_SN field set to the sequence number of the next protocol data unit to be transmitted minus 1, ensuring timely polling and preventing retransmissions by consistently setting Poll_SN to VT(S)−1, regardless of the transmission window size, thereby minimizing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the transmitter selects a transmitted PDU and sets its polling bit to 1 to poll the receiver when no PDU is scheduled for transmission or retransmission, then the polling procedure can be executed, but unnecessary retransmission occurs and system resources are wasted
Solution Approach 1:
The transmitter checks in advance whether any PDU is scheduled for transmission or retransmission before selecting a PDU to poll. This preliminary check prevents the selection of already-transmitted PDUs for polling, thereby avoiding unnecessary retransmissions and conserving system resources.
2Ease of operation
If the POLL SUFI scheme sets Poll_SN based on Configured_Tx_Window_Size, then the polling mechanism can operate, but transmission latency increases and retransmission timing is delayed
Solution Approach 1:
The invention changes the parameter used to set Poll_SN from Configured_Tx_Window_Size to the sequence number of the next PDU to be transmitted minus 1. This parameter change ensures that polling occurs at the optimal time for retransmission, reducing transmission latency while maintaining ease of operation.
Data Source
AI summary
When a polling procedure is triggered, the value of the poll sequence number field within a status protocol data unit is always set to be a sequence number of a next protocol data unit to be transmitted for the first time minus 1, regardless of the configured transmission window size so as to avoid unnecessary transmission delay.