Device and Method for Data Transmission Between Base Stations in Wireless Communication System

Content Provider	The Lens
Abstract	The general purpose of the present disclosure is to retransmit data between base stations in a wireless communication system, and an operating method of a base station comprises the steps of: receiving, from another base station, information on unreceived packets; and retransmitting at least one unreceived packet among the unreceived packets to another base station based on the received information, wherein the at least one unreceived packet is determined based on a difference value between an identification number of the unreceived packets and an identification number of a last packet transmitted to the other base station.
Related Links	https://www.lens.org/lens/patent/009-896-556-676-674/frontpage
Language	English
Publisher Date	2019-12-19
Access Restriction	Open
Content Type	Text
Resource Type	Patent
Jurisdiction	United States of America
Date Applied	2018-02-23
Applicant	Samsung Electronics Co Ltd
Application No.	201816488479
Claim	A method for operating a base station in a wireless communication system, the method comprising: receiving information regarding missed packets from another base station; and retransmitting at least one missed packet among the missed packets to the another base station based on the received information, wherein the at least one missed packet is determined based on a difference value between an identification number of the missed packets and an identification number of a last packet transmitted to the another base station. The method of claim 1 , wherein the retransmitting of the at least one missed packet comprises: generating a list of the missed packets based on the received information; updating the list by excluding packets other than the at least one missed packet among the missed packets from the list; and retransmitting the at least one missed packet based on the updated list. The method of claim 2 , wherein the updating of the list comprises: determining at least one packet identification number satisfying a preset condition; and deleting the determined at least one packet identification number from the list. The method of claim 3 , wherein the determining of the at least one packet identification number satisfying the preset condition comprises determining whether the difference value between the identification number of the missed packets and the identification number of the last packet transmitted to the another base station is equal to or greater than a reordering window value. The method of claim 3 , wherein the determining of the at least one packet identification number satisfying the preset condition comprises determining whether the difference value between the identification number of the missed packets and the identification number of the last packet transmitted to the another base station is less than 0 and the difference value plus a maximum value of an identification number is equal to or greater than a reordering window value. The method of claim 4 , wherein the reordering window value is half of a packet data convergence protocol (PDCP) sequence number (SN) size. The method of claim 1 , wherein the identification number of the missed packets is a PDCP SN or an X2-U SN. A method for operating a base station in a wireless communication system, the method comprising: determining missed packets based on a packet received from another base station; and transmitting a request for retransmission of at least one missed packet among the missed packets to the another base station, wherein the at least one missed packet is determined based on a difference value between an identification number of the missed packets and an identification number of a last packet received from the another base station. The method of claim 8 , wherein the determining of the missed packets comprises generating a list of the missed packets based on an identification number of the packet received from the another base station, and wherein the transmitting of the request for retransmission of the at least one missed packet comprises: updating the list by excluding packets other than the at least one missed packet among the missed packets from the list; and transmitting a request for retransmission of the at least one missed packet based on the updated list. The method of claim 9 , wherein the updating of the list comprises: determining at least one packet identification number satisfying a preset condition; and deleting the determined at least one packet identification number from the list. The method of claim 10 , wherein the determining of the at least one packet identification number satisfying the preset condition comprises determining whether the difference value between the identification number of the missed packets and the identification number of the last packet received from the another base station is equal to or greater than a reordering window value. The method of claim 10 , wherein the determining of the at least one packet identification number satisfying the preset condition comprises determining whether the difference value between the identification number of the missed packets and the identification number of the last packet received from the another base station is less than 0 and the difference value plus a maximum value of an identification number is equal to or greater than a reordering window value. The method of claim 11 , wherein the reordering window value is half of a packet data convergence protocol (PDCP) sequence number (SN) size. A base station in a wireless communication system, the base station comprising: a transceiver; and at least one processor coupled to the transceiver and configured to: receive information regarding missed packets from another base station, and retransmit at least one missed packet among the missed packets to the another base station based on the received information through the transceiver, wherein the at least one missed packet is determined based on a difference value between an identification number of the missed packets and an identification number of a last packet transmitted to the another base station. (canceled) The base station of claim 14 , wherein the at least one processor is further configured to: generate a list of the missed packets based on the received information, update the list by excluding packets other than the at least one missed packet among the missed packets from the list, and retransmit the at least one missed packet based on the updated list. The base station of claim 16 , wherein the at least one processor is further configured to: determine at least one packet identification number satisfying a preset condition, and delete the determined at least one packet identification number from the list. The base station of claim 17 , wherein the at least one processor is further configured to: determine whether the difference value between the identification number of the missed packets and the identification number of the last packet transmitted to the another base station is equal to or greater than a reordering window value. The base station of claim 17 , wherein the at least one processor is further configured to: determine whether the difference value between the identification number of the missed packets and the identification number of the last packet transmitted to the another base station is less than 0 and the difference value plus a maximum value of an identification number is equal to or greater than a reordering window value. The base station of claim 18 , wherein the reordering window value is half of a packet data convergence protocol (PDCP) sequence number (SN) size. The base station of claim 14 , wherein the identification number of the missed packets is a PDCP SN or an X2-U SN.
CPC Classification	WIRELESS COMMUNICATION NETWORKS TRANSMISSION OF DIGITAL INFORMATION; e.g. TELEGRAPHIC COMMUNICATION
Extended Family	000-189-044-528-387 088-306-122-906-367 190-078-117-559-810 009-896-556-676-674 141-747-693-850-671 121-627-695-917-161 097-865-844-892-136 013-373-171-866-41X 193-211-406-798-77X 190-912-425-479-371
Patent ID	20190387432
Inventor/Author	Kwak Dongho Kim Dongsook Kim Hanseok
IPC	H04W28/06 H04W80/08 H04W88/08 H04W92/20
Status	Active
Owner	Samsung Electronics Co. Ltd
Simple Family	000-189-044-528-387 088-306-122-906-367 190-078-117-559-810 009-896-556-676-674 141-747-693-850-671 121-627-695-917-161 097-865-844-892-136 013-373-171-866-41X 193-211-406-798-77X 190-912-425-479-371
CPC (with Group)	H04W28/04 H04W28/06 H04W88/08 H04W92/20 H04L1/1877 H04W80/08
Issuing Authority	United States Patent and Trademark Office (USPTO)
Kind	Patent Application Publication