SK Telecom has filed a patent for a packet loss recovery apparatus and method for IPTV multicast services. The technology uses additional information from an IPTV user equipment to enable a cache server to detect and transmit lost packets, allowing for packet loss recovery. GlobalData’s report on SK Telecom gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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According to GlobalData’s company profile on SK Telecom, Cloud gaming was a key innovation area identified from patents. SK Telecom's grant share as of September 2023 was 34%. Grant share is based on the ratio of number of grants to total number of patents.
Packet loss recovery method for iptv multicast service
A recently filed patent (Publication Number: US20230319368A1) describes a method for recovering packet loss in an internet protocol television (IPTV) system. The method involves a cache server and IPTV user equipment (UE) working together to identify and recover lost transport stream (TS) packets.
In the first claim, the method performed by the cache server is outlined. The cache server receives additional information on a lost TS packet from the IPTV UE. This additional information is used to set a search section in a pre-stored sequence of transmitted TS packets. The cache server then identifies the lost TS packet by searching within the search section. Finally, the cache server extracts a recovery packet corresponding to the lost TS packet and transmits it to the IPTV UE in a unicast manner.
The second claim provides more details about the additional information received by the cache server. This information includes the location of a program clock reference (PCR) preceding the starting position of the packet loss section, the starting interval between the starting position and the PCR position, preceding and trailing sample data, and a continuity counter (CC) sample list. The continuity error, which triggers the generation of the packet loss section, refers to a failure to maintain continuity of CC values for one or more packet identifiers (PIDs) in the received TS packets.
The sixth claim describes the method performed by the IPTV UE. The UE checks for continuity errors using the header information of received TS packets. If a continuity error is detected, the UE determines a packet loss section based on the header information. The UE then generates additional information necessary for recovering the lost TS packet and transmits it to the cache server. Finally, the UE recovers the lost TS packet using a recovery packet obtained from the cache server.
Overall, this patent describes a method for recovering packet loss in an IPTV system by utilizing additional information and a cache server. The method aims to improve the reliability and quality of IPTV services by efficiently identifying and recovering lost TS packets.
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GlobalData, the leading provider of industry intelligence, provided the underlying data, research, and analysis used to produce this article.
GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.
