ARQ Unicast Connection for Multicast Data Transmission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing automatic repetition request mechanisms in wireless communication standards like IEEE802.11 and IEEE802.16 are not adapted for broadcast or multicast communications, leading to high retransmission requests and slowed transmissions when multiple receivers have poor reception quality.
Innovation Solution
A method and device that utilize a unique unicast connection for data transmission to multiple receivers, allowing the sender to identify and retransmit data only if all receivers acknowledge correct receipt, thereby limiting retransmissions and optimizing data delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional ARQ mechanism is used for multicast communication, then each receiver can request retransmission independently, but the number of retransmission requests becomes very high and transmission speed slows down
Solution Approach 1:
The patent merges multiple individual ARQ processes into a single group-level ARQ process. Instead of each receiver independently requesting retransmissions, the sender transmits data to a group of receivers using one unicast connection, and all receivers acknowledge receipt collectively. This combining of multiple individual processes into one group process reduces the number of retransmission requests and prevents transmission slowdowns caused by multiple simultaneous ARQ operations.
2Reliability
If multiple unicast connections are used for multiple receivers, then each receiver gets dedicated connection, but the amount of data to retransmit becomes significant when one receiver has bad reception
Solution Approach 1:
The patent makes a single unicast connection serve multiple receivers simultaneously for the same data transmission. Instead of creating separate unicast connections for each receiver, one unicast connection is opened and shared among multiple receivers. This multi-functional use of a single connection allows the sender to transmit data once to reach multiple receivers, avoiding the need to retransmit the same data multiple times across different connections.
Solution Approach 2:
The patent combines multiple individual unicast connections into a single shared unicast connection for multicast communication. By merging the connection resources, the system reduces the total amount of data that needs to be retransmitted. When retransmission is needed, the sender retransmits on the single shared connection rather than on multiple individual connections, significantly reducing the total data volume required for retransmission.
3Reliability
If ARQ mechanism is implemented for broadcast communication, then error control is provided, but a single receiver with bad reception disturbs all other receivers by triggering retransmission
Solution Approach 1:
The patent implements a selective acknowledgment mechanism where not all receivers need to request retransmission for the same data. The sender opens a unique unicast connection for transmitting data to multiple receivers and uses acknowledgment packets to determine which receivers failed to receive data correctly. This partial action approach ensures error control for individual receivers without forcing retransmissions that would disrupt other receivers with good reception quality.
Data Source
AI summary
The present invention concerns a method and a device for transmitting data between a sender, and at least two receivers, in a network where a data between a sender and a receiver is carried on a connection and where a unicast connection enables a sender to send the data and a receiver to acknowledge a reception of the data. The method comprises the steps of opening a unique unicast connection identified with a connection identifier; and indicating the connection identifier to the sender and the receivers, so that the sender sends the data on the unicast connection, and the receivers receive the data on the unicast connection.