Relay Station ACK-and-Suspend for Wireless Data Transmission
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Solution Overview
Problem
Relay stations in wireless communication systems face challenges in efficiently transmitting data due to their transmit/receive limitations and the need to manage ACK information within specific subframes, which affects data transmission and acknowledgement processes.
Innovation Solution
The implementation of techniques such as ACK-and-suspend, different ACK timelines, and ACK repetition to manage data transmission and acknowledgement processes, allowing for flexible subframe allocation and improved data transfer in relay stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the relay station uses traditional ACK timing for data transmission, then the transmission process is simple, but the ACK information cannot be received when subframes are allocated for backhaul and access links
Solution Approach 1:
The patent implements dynamic ACK timing adjustment where the relay station determines whether to receive ACK information in the first or second subframe based on whether the subframe is allocated for backhaul or access link. This dynamic adaptation allows the system to maintain reliable ACK reception while accommodating the time-division multiplexing of different links, resolving the contradiction between reliability and operational flexibility.
Solution Approach 2:
The patent changes the timing parameter for ACK reception from a fixed schedule to a flexible parameter that can be adjusted between two different subframes. By modifying the ACK reception timing parameter based on subframe allocation, the system ensures reliable ACK reception without requiring complex additional mechanisms, thus resolving the contradiction between reliability and simplicity.
2Adaptability or versatility
If the relay station allocates subframes for both backhaul and access links, then link coverage is improved, but data transmission efficiency decreases due to limited ACK opportunities
Solution Approach 1:
The patent applies preliminary action by having the relay station determine the subframe allocation for backhaul and access links in advance, and accordingly pre-determine which subframe will be used for ACK reception. This advance planning allows the system to maintain high data transmission efficiency by ensuring ACK opportunities are available without requiring complex real-time adjustments, thus resolving the contradiction between flexibility and efficiency.
3Reliability
If the relay station receives ACK information in the first subframe, then the ACK timeline is simple, but the ACK information may be lost when the first subframe is allocated for backhaul link
Solution Approach 1:
The patent introduces a secondary subframe as an intermediary ACK reception opportunity. When the first subframe is allocated for backhaul link, the system uses the second subframe as an alternative intermediary to receive ACK information. This intermediary mechanism ensures reliable ACK delivery without requiring complex retransmission protocols, thus resolving the contradiction between reliability and simplicity.
Data Source
AI summary
Techniques for supporting data transmission via a relay station are described. In an aspect, data transmission may be supported using ACK-and-suspend. A transmitter station sends a first transmission of a packet to a receiver station. The transmitter station receives no ACK information for the first transmission of the packet and suspends transmission of the packet. The transmitter station thereafter receives an indication to resume transmission of the packet and, in response, sends a second transmission of the packet. In another aspect, different ACK timeline may be used when applicable. The receiver station may send ACK information in a designated subframe if available for use or in a different subframe. In yet another aspect, ACK repetition may be used. The receiver may send ACK information in multiple subframes to facilitate reception of the ACK information when the transmitter station is unable to receive one or more of the multiple subframes.