Sidelink Network Coding Accept Request Timing
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Solution Overview
Problem
In wireless communication networks, particularly in sidelink communication, existing technologies face challenges in efficiently managing retransmissions due to half-duplex constraints, which can lead to missed feedback information and reduced reliability of packet transmission.
Innovation Solution
A network coding device is introduced that receives sidelink transmissions with a network coding request flag, delays the accept request message to receive feedback information, and then transmits a network coded sidelink transmission, including the original packet and potentially other packets, to maximize retransmission reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the network coding device transmits accept request message immediately after receiving feedback information, then the transmission delay is reduced, but the reliability of packet transmission deteriorates due to half-duplex constraints causing missed feedback information
Solution Approach 1:
The network coding device performs preliminary action by transmitting the accept request message before receiving the feedback information. This allows the device to secure transmission resources in advance while avoiding the half-duplex conflict, as the accept request is sent on a different channel (PSCCH) than the feedback channel (PSFCH).
Solution Approach 2:
The patent introduces an intermediary timing mechanism where the network coding device sends the accept request message at a determined time that is earlier than the feedback reception time. This intermediary action mediates between the need for low delay and the need for reliable feedback reception, resolving the contradiction by operating in the time domain.
2Reliability
If the network coding device waits to receive feedback information before transmitting accept request message, then the reliability of feedback reception is improved, but the transmission delay increases
Solution Approach 1:
The network coding device performs preliminary action by transmitting the accept request message before receiving the feedback information. This allows the device to secure transmission resources in advance while avoiding the half-duplex conflict, as the accept request is sent on a different channel (PSCCH) than the feedback channel (PSFCH).
Solution Approach 2:
The patent introduces dynamic timing adjustment where the network coding device determines the transmit time of the accept request message based on the received sidelink transmission and feedback information. This dynamic timing allows the device to optimize between delay and reliability by adapting the timing to current channel conditions and traffic patterns.
3Reliability
If network coding device performs retransmissions, then the reliability of packet delivery is improved, but the spectral efficiency deteriorates due to increased channel occupancy
Solution Approach 1:
The network coding device utilizes feedback information from receiving devices to determine which packets require retransmission. This feedback mechanism enables selective retransmission of only those packets that were not successfully received, improving spectral efficiency by avoiding redundant transmissions of already successfully delivered packets.
Solution Approach 2:
The patent changes the parameter of transmission timing by introducing a determined transmit time for the accept request message that is different from the feedback reception time. This parameter change allows the system to achieve both reliable feedback reception and efficient resource utilization by optimizing the timing of control messages.
Data Source
AI summary
Aspects relate to techniques for delaying accept request messages for sidelink network coded communication. A network coding device can receive from a transmitting wireless communication device a sidelink transmission including a packet and a network coding request flag requesting the network coding device perform retransmission(s) of the packet. The network coding device can then receive feedback information for the first packet from a receiving wireless communication device that received the packet at a first time. In addition, the network coding device can transmit an accept request message to the transmitting device indicating whether the network coding device accepts performing retransmission(s) of the packet at a second time different than the first time.