Patents by Inventor Xiaowei Zhang

Xiaowei Zhang has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20160269907
    Abstract: In order for making MTC more efficient and/or secure, a base station (20) forming a communication system connects a UE (10) to a core network. A node (50) serves as an entering point to the core network for a service provider, and transmits traffic between the service provider and the UE (10). The node (50) establishes, as a connection to the base station (20), a first connection for directly transceiving messages between the node (50) and the base station (20). Alternatively, the node (50) establishes a second connection for transparently transceiving the messages through a different node (30) that is placed within the core network and has established a different secure connection to the base station (20).
    Type: Application
    Filed: October 21, 2014
    Publication date: September 15, 2016
    Applicant: NEC Corporation
    Inventors: Xiaowei ZHANG, Anand Reghawa PRASAD, Andreas KUNZ, Genadi VELEV, Toshiyuki TAMURA
  • Publication number: 20160269903
    Abstract: In order for effectively ensuring security for direct communication in ProSe, a ProSe Function acquires from a 3rd party root keys for each of UEs to derive a pair of session keys for securely conducting direct communication with different UEs, and distributes the acquired root keys to each of the UEs. Each of the UEs derives the session keys by using one of the distributed root keys. Moreover, a plurality of UEs, which form a communication system, and are allowed to conduct direct communication with each other when the UEs are in proximity to each other, share public keys of the UEs therebetween through a node which supports the direct communication upon successfully registering the UEs with the node. Each of the UEs verifies at least a request for the direct communication by using one of the public keys.
    Type: Application
    Filed: August 27, 2014
    Publication date: September 15, 2016
    Inventors: Xiaowei ZHANG, Anand Raghawa PRASAD
  • Patent number: 9428407
    Abstract: A method for preparing un-hardened ceramic micro-electrolysis fillers by industrial solid wastes comprises: (1) Scrap iron, lignin, red mud and clay was completely mixed as mass ratio (4-5):(2-3):(1-3):3 and then made into pellets; (2) The dried pellets were sintered without oxygen. The production could be used in wastewater treatment, which could not only increase biodegradability but also decrease CODCr and toxicity in a short time.
    Type: Grant
    Filed: March 10, 2014
    Date of Patent: August 30, 2016
    Assignee: SHANDONG UNIVERSITY
    Inventors: Qinyan Yue, Deyi Huang, Baoyu Gao, Yuanyuan Sun, Xiaowei Zhang, Yuan Gao, Kaifang Fu, Jiaojiao Kong
  • Publication number: 20160226668
    Abstract: In order for charging SDT and MTC device trigger over control plane, there is provided a network node (40) that relays messages over a control plane (T5 and Tsp) between an MTC device (10) and an SCS (50). The network node (40) counts the number of messages successfully relayed, and generates a CDR in accordance with the counted number. The messages are SDT messages delivered from the MTC device (10) to the SCS (50), SDT messages delivered from the SCS (50) to the MTC device (10), or MTC device trigger messages delivered from the SCS (50) to the MTC device (10). The network node (40) transfers the CDR to an OCF (31) or a CDF (32).
    Type: Application
    Filed: August 4, 2014
    Publication date: August 4, 2016
    Applicant: NEC Corporation
    Inventors: Xiaowei ZHANG, Anand Raghawa PRASAD
  • Patent number: 9398521
    Abstract: When MME receives Handover required from source eNB/HeNB which contains CSG ID, it verifies whether the CSG subscription data it stores is fresh or expired. If it is expired, or if MME does not have any association data for UE, MME retrieves the latest CSG subscription data from HSS. MME rewrites its stored CSG subscription data with the one retrieved from HSS, if they are different. MME performs access control for the UE according to the CSG ID received from Handover required message and its CSG subscription data. When the access control is failed, a new message List Update Indication is proposed to be sent from source eNB/HeNB to UE. In order to indicate what caused the failure, an appropriate cause in the message is proposed. Upon receiving the message, UE updates its stored CSG whitelist, such that the CSG subscription data in UE and MME are synchronized.
    Type: Grant
    Filed: June 8, 2011
    Date of Patent: July 19, 2016
    Assignee: NEC CORPORATION
    Inventors: Xiaowei Zhang, Anand Raghawa Prasad
  • Publication number: 20160182477
    Abstract: In order to improve security upon distributing a group key, there is provided a gateway (20) to a core network for a group of MTC devices (10_1-10_n) communicating with the core network. The gateway (20) protects confidentiality and integrity of a group key, and distributes the protected group key to each of the MTC devices (10_1-10_n). The protection is performed by using: a key (Kgr) that is preliminarily shared between the gateway (20) and each of the MTC devices (10_1-10_n), and that is used for the gateway (20) to authenticate each of the MTC devices (10_1-10_n) as a member of the group; or a key (K_iwf) that is shared between an MTC-IWF (50) and each of the MTC devices (10_1-10_n), and that is used to derive temporary keys for securely conducting individual communication between the MTC-IWF (50) and each of the MTC devices (10_1-10_n).
    Type: Application
    Filed: July 7, 2014
    Publication date: June 23, 2016
    Inventors: Xiaowei ZHANG, Anand Raghawa PRASAD
  • Publication number: 20160164875
    Abstract: A secure system 1 includes a requesting device (L01) which requests a communication, and a receiving device (L03) which receives a communication request from the requesting device (L01). The requesting device (L01) and the receiving device (L03) are members of a specific group when the requesting device (L01) discovers the receiving device (L03). The requesting device (L01) is allowed to communicate with the requesting device (L01) by a network used by the specific group or by the receiving device upon a proof being provided by a network used by the specific group, the devices (L01) and (L03) being able to perform a mutual authentication over a direct wireless interface, or the receiving device (L03) checking a list maintained by a user on members of the specific group of devices for ProSe service purpose.
    Type: Application
    Filed: June 13, 2014
    Publication date: June 9, 2016
    Applicant: NEC Corporation
    Inventors: Xiaowei ZHANG, Anand Raghawa PRASAD
  • Publication number: 20160149876
    Abstract: A method of performing authentication and authorization in Proximity based Service (ProSe) communication by a requesting device (31) which sends a request of a communication and a receiving device (32) which receives the request from the requesting device (31) and (32), the method including deriving session keys Kpc and Kpi from an unique key Kp at the requesting and receiving devices (31) and (32), using the session keys Kpc and Kpi for ProSe communication setup and direct communication between the requesting and receiving devices (31) and (32), starting the direct communication with the requesting and receiving devices (31) and (32). The key Kpc is confidentiality key and the key Kpi is integrity protection key.
    Type: Application
    Filed: June 13, 2014
    Publication date: May 26, 2016
    Applicant: NEC Corporation
    Inventors: Xiaowei ZHANG, Anand Raghawa PRASAD
  • Publication number: 20160149928
    Abstract: A method of forming a secure group in ProSe communication includes requesting a service request to a ProSe server from a requesting device (21), the service request indicating a request to communicate with a receiving device (22) from the requesting device (21), performing verification on the requesting and receiving devices (21) and (22) by the ProSe server 24, sending a ProSe Service Result to the requesting and receiving devices (21) and (22) to inform to be allowed a group member, and starting a group security establishment of the group including the requesting and receiving devices (21) and (22).
    Type: Application
    Filed: June 13, 2014
    Publication date: May 26, 2016
    Applicant: NEC Corporation
    Inventors: Xiaowei ZHANG, Anand Raghawa PRASAD
  • Publication number: 20160075571
    Abstract: A method for preparing un-hardened ceramic micro-electrolysis fillers by industrial solid wastes comprises: (1) Scrap iron, lignin, red mud and clay was completely mixed as mass ratio (4-5):(2-3):(1-3):3 and then made into pellets; (2) The dried pellets were sintered without oxygen. The production could be used in wastewater treatment, which could not only increase biodegradability but also decrease CODCr and toxicity in a short time.
    Type: Application
    Filed: March 10, 2014
    Publication date: March 17, 2016
    Applicant: SHANDONG UNIVERSITY
    Inventors: Qinyan YUE, Deyi HUANG, Baoyu GAO, Yuanyuan SUN, Xiaowei ZHANG, Yuan GAO, Kaifang FU, Jiaojiao KONG
  • Publication number: 20160037571
    Abstract: A method for providing device connectivity to a radio access network, wherein at least two devices are connectable or connected to the radio access network and wherein the at least two devices are members of a group of devices within a wireless local network, the members of the group of devices having the capability to establish a direct connection with other members of the group of devices, includes providing connection information used for a connection between a first device of the at least two devices and the radio access network to a second device of the at least two devices. The connection information enables the second device to connect to the radio access network.
    Type: Application
    Filed: April 10, 2014
    Publication date: February 4, 2016
    Inventors: Mohammad Istiak Hossain, Andreas Kunz, Konstantinos Samdanis, Xiaowei Zhang
  • Publication number: 20150380158
    Abstract: A method may include annealing a material including iron and nitrogen in the presence of an applied magnetic field to form at least one Fe16N2 phase domain. The applied magnetic field may have a strength of at least about 0.2 Tesla (T).
    Type: Application
    Filed: June 29, 2015
    Publication date: December 31, 2015
    Inventors: Michael P. Brady, Orlando Rios, Yanfeng Jiang, Gerard M. Ludtka, Craig A. Bridges, Jian-Ping Wang, Xiaowei Zhang, Lawrence F. Allard, Edgar Lara-Curzio
  • Publication number: 20150358816
    Abstract: Each of a group of MTC UEs (10—1 to 10_n) is configured with a first group key (Kgr) for a group GW (20) to authenticate each of the MTC UEs (10—1 to 10_n) as a member of the group. The group GW (20) is also configured with the first group key (Kgr) for authenticating each of the MTC UEs (10—1 to 10_n) as the member of the group. The group GW (20) can be configured with a second group key (Kgw) for an MME (30) to determine whether or not to allow the group GW (20) to broadcast a message to the MTC UEs (10—1 to 10_n).
    Type: Application
    Filed: December 4, 2013
    Publication date: December 10, 2015
    Inventors: Xiaowei ZHANG, Anand Raghawa PRASAD
  • Publication number: 20150334560
    Abstract: There is provided a new IWF SMC procedure for establishing security association between an MTC UE (10) and an MTC-IWF (20). The MTC-IWF (20) sends to the UE (10) at least an algorithm identifier which instructs the UE (10) to select one of algorithms for deriving a root key (K_iwf). The UE (10) derives the root key (K_iwf) in accordance with the selected algorithm, and derives at least a subkey for checking the integrity of messages transferred between the UE (10) and the MTC-IWF (20) by using the derived root key (K_iwf). The UE (10) protects uplink messages transmitted to the MTC-IWF (20) with the derived subkey. The MTC-IWF (20) protects downlink messages transmitted to the UE (10) with the same subkey derived at a core network.
    Type: Application
    Filed: January 7, 2014
    Publication date: November 19, 2015
    Inventors: XIAOWEI ZHANG, ANAND RAGHAWA PRASAD
  • Publication number: 20150319172
    Abstract: An SCS (60) sends out a trigger message for activating a group of MTC devices (10—1 to 10—n) through a network. An HSS (40) verifies whether or not to transfer the trigger message to the given MTC devices (10—1 to 10—n) based on subscription information of the group. A group GW (20) broadcasts the trigger message. Further, An MME (30) concatenates DL (downlink) messages addressed to the MTC devices (10—1 to 10—n). The group GW (20) distributes, to the MTC devices (10—1 to 10—n), the DL messages included in the concatenated message. Furthermore, the group GW (20) concatenates UL (uplink) messages received from the MTC devices (10—1 to 10—n). The MME (30) processes the UL messages included in the concatenated message.
    Type: Application
    Filed: December 4, 2013
    Publication date: November 5, 2015
    Inventors: Xiaowei ZHANG, Anand Raghawa PRASAD
  • Publication number: 20150304841
    Abstract: A root key (K_iwf) is derived at a network and sent to MTC UE (10). The K_iwf is used for deriving subkeys for protecting communication between MTC UE (10) and MTC-IWF (20). In a case where HSS (30) derives the K_iwf, HSS (30) send to MTC-IWF (20) the K_iwf in a new message (Update Subscriber Information). In a case where MME (40) derives the K_iwf, MME (40) sends the K_iwf through HSS (30) or directly to MTC-IWF (20). MTC-IWF (20) can derive the K_iwf itself. The K_iwf is sent through MME (40) to MTC UE (10) by use of a NAS SMC or Attach Accept message, or sent from MTC-IWF (20) directly to MTC UE (10). In a case where the K_iwf is sent from MME (40), MME (40) receives the K_iwf from HSS (30) in an Authentication Data Response message, or from MTC-IWF (20) directly.
    Type: Application
    Filed: December 3, 2013
    Publication date: October 22, 2015
    Inventors: Xiaowei ZHANG, Anand Raghawa PRASAD
  • Publication number: 20150229620
    Abstract: A MTC device (10) and a MTC interworking function, MTC-IWF, (20) form a communication system and conduct communication with each other. In this communication system, a root key (K_iwf) is securely shared between the MTC device (10) and the MTC-IWF (20). The MTC device (10) and the MTC-IWF (20) use the root key (K_iwf) to respectively derive temporary keys (K_di (K_di_conf, K_di_int)) for protecting the communication. The temporary keys provide integrity protection and confidentiality. The root key can be derived by the HSS or MME/SGSN/MSC and provided to the MTC-IWF. The root key can also be derived by the MTC-IWF based on received key derivation material. The described system is useful for the security of small data transmission in MTC system.
    Type: Application
    Filed: September 12, 2013
    Publication date: August 13, 2015
    Applicant: NEC Corporation
    Inventors: Xiaowei Zhang, Anand Raghawa Prasad
  • Publication number: 20150200942
    Abstract: A network node (21), which is placed within a core network, receives a message from a transmission source (30) placed outside the core network. The message includes an indicator indicating whether or not the message is addressed to a group of one or more MTC devices attached to the core network. The network node (21) determines to authorize the transmission source (30), when the indicator indicates that the message is addressed to the group. Further, the message includes an ID for identifying whether or not the message is addressed to the group. The MTC device determines to discard the message, when the ID does not coincide with an ID allocated for the MTC device itself. Furthermore, the MTC device communicates with the transmission source (30) by use of a pair of group keys shared therewith.
    Type: Application
    Filed: April 19, 2013
    Publication date: July 16, 2015
    Applicant: NEC Corporation
    Inventors: Xiaowei Zhang, Anand Raghawa Prasad
  • Patent number: 9077698
    Abstract: If the related secure communication method is applied to the system which includes a plurality of the MTC devices, traffic in a network would increase in proportion to the number of MTC devices. A disclosed communication apparatus is connected to a network and a plurality of communication terminals, and includes: a group information sending unit for sending group information, which is received from the network; an access control unit for 1) receiving a reply from the communication terminal(s) which responded to the group information and 2) sending the reply to the network; and a temporary identifier and group key sending unit for sending a temporary identifier and a group key to the communication terminal which responded to the group information, when the communication apparatus received the temporary identifier and the group key from the network.
    Type: Grant
    Filed: August 1, 2011
    Date of Patent: July 7, 2015
    Assignee: NEC CORPORATION
    Inventors: Raghawa Prasad, Xiaowei Zhang
  • Publication number: 20150189460
    Abstract: A network node (21), which is placed within a core network, stores a list of network elements (24) capable of forwarding a trigger message to a MTC device (10). The network node (21) receives the trigger message from a transmission source (30, 40) placed outside the core network, and then selects, based on the list, one of the network elements to forward the trigger message to the MTC device (10). The MTC device (10) validates the received trigger message, and then transmits, when the trigger message is not validated, to the network node (21) a reject message indicating that the trigger message is not accepted by the MTC device (10). Upon receiving the reject message, the network node (21) forwards the trigger message through a different one of the network elements, or forwards the reject message to transmission source (30, 40) to send the trigger message through user plane.
    Type: Application
    Filed: April 23, 2013
    Publication date: July 2, 2015
    Applicant: NEC Corporation
    Inventors: Xiaowei Zhang, Anand Raghawa Prasad