Wireless Node Duplicate ACK Filtering
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Solution Overview
Problem
In wireless communications, the transmission of duplicate acknowledgments (DUP ACKs) for out-of-order packets leads to inefficient use of uplink resources, causing substantial communication overhead and interference due to the need for multiple scheduling requests and grants.
Innovation Solution
A wireless node receives packets with sequence number gaps, forwards them to a processing layer, and selectively transmits a subset of DUP ACK messages rather than all, based on predicted DUP ACK generation and buffer management, to reduce unnecessary transmissions and requests for uplink grants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wireless node transmits all duplicate acknowledgment messages for out-of-order packets, then the base station receives complete feedback for packet retransmission, but uplink resource efficiency deteriorates due to excessive scheduling requests and grants
Solution Approach 1:
The patent extracts only the necessary subset of duplicate acknowledgment messages for transmission to the base station, rather than transmitting all DUP ACKs. This is achieved by identifying and transmitting only those DUP ACKs that correspond to packets requiring retransmission, while filtering out redundant acknowledgments for packets already received in order. This extraction principle resolves the contradiction by maintaining acknowledgment completeness for necessary packets while eliminating unnecessary transmissions that consume uplink resources.
Solution Approach 2:
The patent applies partial action by transmitting a selective subset of duplicate acknowledgments rather than all possible DUP ACKs. The wireless node determines which DUP ACKs to transmit based on packet reception status and retransmission requirements, sending only the partial set needed for reliable communication. This partial action maintains sufficient feedback for the base station to perform packet retransmission while avoiding the excessive resource consumption that would result from transmitting all duplicate acknowledgments.
2Ease of operation
If the wireless node transmits multiple scheduling requests for DUP ACKs, then the base station can allocate uplink grants for transmission, but communication overhead increases substantially
Solution Approach 1:
The patent extracts only the essential scheduling requests needed to support the transmission of necessary DUP ACKs. By filtering out redundant DUP ACKs before transmission, the number of associated scheduling requests is automatically reduced. The wireless node generates scheduling requests only for the subset of DUP ACKs that will actually be transmitted, thereby maintaining uplink transmission capability while substantially reducing communication overhead from unnecessary scheduling request-grant exchanges.
3Reliability
If the wireless node transmits all DUP ACK messages, then packet retransmission reliability is maintained, but interference in the wireless system increases
Solution Approach 1:
The patent extracts and transmits only the necessary subset of DUP ACK messages that contribute to reliable packet retransmission. By identifying and eliminating redundant DUP ACKs in the transmission subset, the patent maintains retransmission accuracy for packets that require retransmission while reducing the total number of transmissions in the system. This reduction in transmission volume directly decreases wireless interference without compromising the reliability of essential packet acknowledgments.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A wireless node may receive one or more data messages which may include a set of packets that may each be associated with a sequence number. The set of packets may be received with a gap in the set of sequence numbers, indicating missing packets. The wireless node may forward the set of packets to a processing layer of the wireless node. The wireless node may then accept, from the processing layer of the wireless node, a set of duplicate (DUP) acknowledgment (ACK) messages based on the set of packets being forwarded to the processing layer while having the gap in the set of sequence numbers. The wireless node may transmit, a subset of the set of DUP ACKs rather than all of the set of DUP ACKs to another wireless node, such as a base station.