How Mobile Devices Automatically Manage Data Retransmission Errors

A method for mobile devices to efficiently track and fix data transmission errors by mathematically assigning ID tags to recurring data packets.

What it covers

When a phone receives data, some packets might arrive corrupted. This patent describes a system where the network and the phone agree on a mathematical formula to label these data packets using a HARQ process ID. By using the timing of the transmission and the interval of the resource allocation, the device can automatically calculate which ID belongs to which packet. This allows the device to correctly combine a failed initial transmission with a later retransmission to successfully decode the data.

What it doesn't cover

• —Does not cover data transmission methods that do not use semi-persistent resource allocation
• —Does not cover error correction methods that rely solely on forward error correction without retransmission
• —Does not cover the physical hardware design of the antennas or radio frequency transceivers

The clever bit

Instead of sending a unique ID for every single packet, the system uses a deterministic formula (HARQ process ID = s modulo n) that allows both the transmitter and receiver to calculate the ID independently based on time, saving precious bandwidth.

Why it matters

This technology is essential for maintaining stable connections in mobile networks like 4G LTE and 5G. By automating the identification of data packets, it reduces the amount of control information the network needs to send, which saves battery life and improves data throughput for users.

Real-world examples

• 1.4G LTE mobile data connections
• 2.5G NR mobile communication systems
• 3.Voice over LTE (VoLTE) packet management