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Patent Issued for Method, Apparatus, and System for Sending a Data Packet

May 27, 2014



By a News Reporter-Staff News Editor at Journal of Technology -- From Alexandria, Virginia, VerticalNews journalists report that a patent by the inventors Wang, Yan (Beijing, CN); Lin, Bo (Beijing, CN); Liu, Yuhong (Beijing, CN), filed on September 16, 2011, was published online on May 13, 2014.

The patent's assignee for patent number 8724587 is Huawei Technologies Co., Ltd. (Shenzhen, CN).

News editors obtained the following quote from the background information supplied by the inventors: "To meet a requirement of IMT-Advanced (International Mobile Telecommunication-Advanced), a next generation radio communications technology of ITU (International Telegraph Union, International Telecommunications Union), 3GPP launches LTE-Advanced, which is an enhanced and evolved version of LTE (Long Term Evolution, Long Term Evolution) that will be finalized soon, in order to meet technical specifications defined by ITU. LTE-Advanced introduces a relay node (Relay Node, RN) to implement functions such as radio network coverage with a high data rate, increasing cell edge throughput and providing new area coverage.

"The relay node is connected to an evolved NodeB (eNB) through a radio link. Therefore, a terminal may first be connected to the relay node and then the relay node is connected to the evolved NodeB to realize an air interface of the terminal.

"As shown in FIG. 1, after a relay node is introduced, user data is sent from a core network to an evolved NodeB (donor eNB) attached by the relay node, and sent by the evolved NodeB to the relay node, and finally the relay node sends the user data to a user equipment (User Equipment, UE).

"For a user equipment that is initially served by the relay node, when the network side instructs the user equipment to hand over to the donor evolved NodeB, according to a handover procedure in a current LTE technology, the relay node may forward downlink data that is cached but not yet sent to the user equipment to the donor evolved NodeB. But the downlink data on the relay node is originally sent by the donor evolved NodeB to the relay node. Therefore, the same data is sent by the donor evolved NodeB to the relay node and then forwarded by the relay node back to the donor evolved NodeB. This causes a waste of a radio link between the relay node and the donor evolved NodeB."

As a supplement to the background information on this patent, VerticalNews correspondents also obtained the inventors' summary information for this patent: "Embodiments of the present invention provide a method, an apparatus, and a system for sending a data packet to avoid a problem of repeated forwarding of data that is caused in a handover of a user equipment between access points.

"Embodiments of the present invention adopt the following technical solutions:

"An embodiment of the present invention provides a method for sending a data packet, where the method includes:

"receiving, by an evolved NodeB, a data packet sent by a core network and sending the data packet to a current access point; and

"keeping caching the data packet on the evolved NodeB before determining that a user equipment has correctly received the data packet from the current access point.

"An embodiment of the present invention provides another method for sending a data packet, where the method includes:

"receiving, by an access point, a data packet sent by an evolved NodeB and sending the data packet to a user equipment; and

"when determining that the user equipment has correctly received the data packet, sending, by the access point, a response message which indicates that the user equipment has correctly received the data packet to the evolved NodeB to notify the evolved NodeB that it is unnecessary to continue caching the data packet.

"An embodiment of the present invention provides an apparatus for sending a data packet, where the apparatus is disposed on an evolved NodeB and includes:

"a data forwarding unit, configured to receive a data packet sent by a core network and send the data packet to an access point;

"a determining unit, configured to determine that a user equipment has correctly received the data packet from the access point; and

"a caching unit, configured to cache the data packet before the determining unit determines that the user equipment has correctly received the data packet from the access point.

"An embodiment of the present invention provides another apparatus for sending a data packet, where the apparatus is disposed on an access point and includes:

"a receiving and forwarding unit, configured to receive a data packet sent by an evolved NodeB and send the data packet to a user equipment; and

"a responding unit, configured to: after determining that the user equipment has correctly received the data packet, send a response message which indicates that the user equipment has correctly received the data packet to the evolved NodeB to notify the evolved NodeB that it is unnecessary to continue caching the data packet.

"An embodiment of the present invention provides a system for sending a data packet, where the system includes:

"a first sending apparatus disposed on an evolved NodeB, configured to: receive a data packet sent by a core network and send the data packet to a second sending apparatus; and keep caching the data packet before receiving from the second sending apparatus a response message which indicates that a user equipment has correctly received the data packet; and

"the second sending apparatus disposed on an access point, configured to: receive the data packet sent by the first sending apparatus and send the data packet to the user equipment; and after receiving a response message that is sent by the user equipment and indicates that the data packet has been correctly received, send a response message which indicates that the user equipment has correctly received the data packet to the first sending apparatus.

"With the method, apparatus, and system for sending a data packet according to the embodiments of the present invention, before it is determined that the user equipment has correctly received data packets that are forwarded by the access point, the data packets are cached on the evolved NodeB and may be deleted after it is determined that the user equipment has correctly received the data packets. During sending of the data packets, if the user equipment hands over to the evolved NodeB or another access point, the user equipment can receive the data packets from the evolved NodeB directly or from the evolved NodeB via the access point handed over to. This avoids data forwarding from the original access point of the user equipment to the evolved NodeB and therefore saves network resources."

For additional information on this patent, see: Wang, Yan; Lin, Bo; Liu, Yuhong. Method, Apparatus, and System for Sending a Data Packet. U.S. Patent Number 8724587, filed September 16, 2011, and published online on May 13, 2014. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=48&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=2360&f=G&l=50&co1=AND&d=PTXT&s1=20140513.PD.&OS=ISD/20140513&RS=ISD/20140513

Keywords for this news article include: Huawei Technologies Co. Ltd..

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Source: Journal of Technology


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