Patents by Inventor Dajun Zhang
Dajun 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).
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Publication number: 20150139192Abstract: Embodiments of the present invention relate to the technical field of wireless communications, and specifically relate to a method, system and device for switching, for use in solving the problem in the prior art of the risk of communication interruption when a user equipment (UE) is switching due to greatly increased frequency and number of times of switching by the UE in an E-UTRAN network architecture. The method of the embodiments of the present invention comprises: a UE receives a DRB reconfiguration message from a macro base station; and the UE keeps a PDCP layer corresponding to all of the DRBs of a control side and of a user side at the macro base station, and switches other layers corresponding to some or all of the DRBs of the user side except the PDCP layer onto at least one base station.Type: ApplicationFiled: December 26, 2014Publication date: May 21, 2015Applicant: China Academy of Telecommunications TechnologyInventors: Dajun ZHANG, Wei BAO, Jing LIANG, Yi YANG, Yali ZHAO
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Publication number: 20150031686Abstract: Disclosed are phenyl-oxazolyl derivatives having a general formula (I), a preparation method thereof, and an application of the phenyl-oxazolyl derivatives as an inosine monophosphate dehydrogenase (IMPDH) inhibitor.Type: ApplicationFiled: March 6, 2013Publication date: January 29, 2015Inventors: Zhaojin Zhong, Zhuorong Li, Dajun Zhang, Yuhuan Li, Zhen Wang, Rongmei Gao, Jiajia Shen
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Publication number: 20140332332Abstract: A shock absorber for a vehicle includes a pressure tube that defines a fluid chamber. A piston disposed within the fluid chamber divides the fluid chamber into an upper working chamber and a lower working chamber. The piston defines a compression passage and a rebound passage which extend through the piston between the upper working chamber and the lower working chamber. A valve disc assembly engages the piston and controls the flow of fluid between the upper working chamber and the lower working chamber. The valve disc assembly includes a bleed disc that defines an orifice with a substantially non-linear contour. The orifice extends to an outer diameter of the bleed disc, and forms a bleed channel between the upper working chamber and the lower working chamber.Type: ApplicationFiled: May 12, 2014Publication date: November 13, 2014Applicant: Tenneco Automotive Operating Company Inc.Inventors: Tim Lawler, Chad Rummel, Elizabeth Robbins, Daniel T. Keil, Jeroen K. Paenhuysen, John McGahey, Dajun Zhang
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Patent number: 8824350Abstract: A channel synchronization method, system and device in the multicast broadcast single frequency network are disclosed, which relate to wireless communication filed and are used to solve the problem of unable to ensure the base station to synchronously send the multi-points control channel (MCCH) message in the multicast broadcast single frequency network (MBSFN) region in the prior art. The specific scheme is: the network device in the MBSFN obtains multimedia broadcast multicast service (MBMS) service information and confirms the time resource and the frequency resource that bears MBMS service information. The network device sends the MBMS service information, the time resource and the frequency resource information to the base station in the MBSFN. The base station utilizing the time resource and the frequency resource sends the MBMS service information to the terminal via MBMS point to MCCH.Type: GrantFiled: May 13, 2010Date of Patent: September 2, 2014Assignee: China Academy of Telecommunications TechnologyInventors: Dajun Zhang, Xiaodong Yang, Jing Liang
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Patent number: 8761806Abstract: The present invention discloses a method, system and device for implementing positioning measurement. The method includes the steps of: determining a Timing Advance (TA) report format according to obtained information on whether a User Equipment (UE) can support the measurement of the receiving-transmitting(Rx-Tx) time difference and information on whether a base station (e.g. eNB)can support the measurement of the Rx-Tx time difference of the base station and the measurement of the Rx-Tx time difference of the UE in an Enhanced Cell Identity (E-CID) positioning process of the user equipment, and after the base station processes the E-CID positioning measurement, the positioning measurement result is returned to the Evolved Serving Mobile Location Center (E-SMLC) in the determined timing advance report format.Type: GrantFiled: October 28, 2010Date of Patent: June 24, 2014Assignee: China Academy of Telecommunications TechnologyInventors: Dajun Zhang, Haiyang Quan, Jiayi Fang
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Publication number: 20140050135Abstract: The present invention relates to the technical field of wireless communications, is used for optimizing an energy saving mechanism, and provides a method for energy saving compensation, which method comprises: expanding, by a base station, a signal coverage area to form a new cell, when the energy saving activation requirements are met, so as to allow an energy-saving cell managed by the base station to switch users to the new cell and to activate the energy saving state; and when energy saving deactivation requirements are met, and if the energy-saving cell managed by the base station deactivates the energy saving state, then switching, by the base station, the users to the energy-saving cell and reducing the signal coverage area. The present invention optimizes currently available energy saving mechanisms and provides a solution capable of compensating the service loss of energy-saving cells.Type: ApplicationFiled: August 22, 2013Publication date: February 20, 2014Applicant: China Academy of Telecommunications TechnologyInventors: Dajun Zhang, Li Chen
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Publication number: 20130286926Abstract: Disclosed are a method and a device for synchronously counting a multimedia broadcast multicast service (MBMS) service. Through technical solutions of embodiments of the present invention, synchronization time point information is carried in a message sent to a base station by an MBMS coordinating entity (MCE), so that the base station counts the MBMS service at the corresponding synchronization time point, collects the counting information and feeds back the counting information to the MCE. Whereby, the base station can count the MBMS service for each terminal device served by the base station at the same time point and collect and transmit the MBMS service counting information to the MCE, thereby ensuring synchronization of MBMS service counting time, ensuring synchronization of multicast control channel (MCCH) contents at the air interface, and solving the problem that synchronization of MBMS service counting time cannot be ensured in the prior art.Type: ApplicationFiled: December 26, 2011Publication date: October 31, 2013Applicant: DATANG MOBILE COMMUNICATIONS EQUIPMENT CO., LTDInventors: Dajun Zhang, Li Chen
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Publication number: 20130286917Abstract: Disclosed is a method for compensation and restoring of a coverage area, for realizing energy saving and compensation between nodes. The coverage compensation method includes: judging whether or not the trigger condition for starting an energy saving and compensation process is satisfied according to a preset energy saving and compensation strategy; when the trigger condition for starting the energy saving and compensation process is satisfied, one of a first node and a second node carries out an energy saving operation in the energy saving and compensation process while the other node carries out a compensation operation in the energy saving and compensation process; wherein the first node is a compensation node and the second node is an energy saving node, or the first node is an energy saving node and the second node is a compensation node. Further disclosed is a device for implementing the method.Type: ApplicationFiled: January 6, 2012Publication date: October 31, 2013Applicant: DATANG MOBILE COMMUNICATIONS EQUIPMENT CO., LTD.Inventors: Beibei Jia, Li Chen, Dajun Zhang, Ying Wang, Guoqing Li
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Patent number: 8543116Abstract: The present invention relates to the technical field of wireless communications, is used for optimizing an energy saving mechanism, and provides a method for energy saving compensation, which method comprises: expanding, by a base station, a signal coverage area to form a new cell, when the energy saving activation requirements are met, so as to allow an energy-saving cell managed by the base station to switch users to the new cell and to activate the energy saving state; and when energy saving deactivation requirements are met, and if the energy-saving cell managed by the base station deactivates the energy saving state, then switching, by the base station, the users to the energy-saving cell and reducing the signal coverage area. The present invention optimizes currently available energy saving mechanisms and provides a solution capable of compensating the service loss of energy-saving cells.Type: GrantFiled: August 12, 2011Date of Patent: September 24, 2013Assignee: China Academy of Telecommunications TechnologyInventors: Dajun Zhang, Li Chen
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Publication number: 20130201900Abstract: The present invention discloses a mapping method and apparatus for resource status process, and the method comprises the following steps: DeNB receives resource status information from RN; said DeNB acquires the address of source eNB according to said resource status information and context information; said DeNB sends said resource status information to said source eNB according to the address of said source eNB. In the present invention, context information on DeNB is established for source eNB to enable DeNB to route resource status response message or resource status report to correct source eNB apparatus according to context information.Type: ApplicationFiled: June 3, 2011Publication date: August 8, 2013Applicant: CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGYInventors: Dajun Zhang, Guoqing Li, Wei Bao
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Publication number: 20130163504Abstract: Disclosed are a method, a device, and a system for the acquisition of control node information. In embodiments of the present invention, on the basis of information transmitted by a base station, a relay node acquires control node information on user terminal access attached in the information acquired, thereby allowing a relay node in a system placed after the introducing relay node to be informed of the control node information on user terminal access.Type: ApplicationFiled: December 1, 2012Publication date: June 27, 2013Inventors: Beibei Jia, Dajun Zhang, Yi Yang, Wei Bao
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Publication number: 20130163439Abstract: The invention discloses a method and device for sending and receiving interface connectivity information. eNB sends the message carrying interface connectivity information between eNB and neighbor eNB through X2 interface to enable relay node to acquire the interface connectivity information between eNB and neighbor eNB to further accomplish handover, automatic neighbor relation setup, interference coordination and load equilibrium.Type: ApplicationFiled: December 1, 2012Publication date: June 27, 2013Inventors: Beibei Jia, Dajun Zhang, Yi Yang, Wei Bao
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Publication number: 20130150044Abstract: The present invention relates to the technical field of wireless communications, is used for optimizing an energy saving mechanism, and provides a method for energy saving compensation, which method comprises: expanding, by a base station, a signal coverage area to form a new cell, when the energy saving activation requirements are met, so as to allow an energy-saving cell managed by the base station to switch users to the new cell and to activate the energy saving state; and when energy saving deactivation requirements are met, and if the energy-saving cell managed by the base station deactivates the energy saving state, then switching, by the base station, the users to the energy-saving cell and reducing the signal coverage area. The present invention optimizes currently available energy saving mechanisms and provides a solution capable of compensating the service loss of energy-saving cells.Type: ApplicationFiled: August 12, 2011Publication date: June 13, 2013Inventors: Dajun Zhang, Li Chen
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Publication number: 20130127474Abstract: Disclosed are a control processing method of an energy-saving cell and a base station.Type: ApplicationFiled: August 11, 2011Publication date: May 23, 2013Inventors: Dajun Zhang, Li Chen
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Publication number: 20130095842Abstract: The present invention discloses a method and equipment for saving energy. The method comprises the following steps: the first network node acquires load information of the second network node next to the first and modifies energy saving state according to its own load information and that of said second network node; said first and second network nodes send information on indication for saving energy state to the adjacent third network node and inform the information of modifying energy saving state to said third network node based on said information on indication for saving energy state. Embodiments of the present invention optimize resource utilization rate of the whole network.Type: ApplicationFiled: April 18, 2011Publication date: April 18, 2013Applicant: CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGYInventors: Beibei Jia, Dajun Zhang, Jinbo Zhao, Sen Xu
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Publication number: 20130040664Abstract: The present invention discloses a method, system and device for implementing positioning measurement. The method includes the steps of: determining a Timing Advance (TA) report format according to obtained information on whether a User Equipment (UE) can support the measurement of the receiving-transmitting (Rx-Tx) time difference and information on whether a base station (e.g. eNB) can support the measurement of the Rx-Tx time difference of the base station and the measurement of the Rx-Tx time difference of the UE in an Enhanced Cell Identity (E-CID) positioning process of the user equipment, and after the base station processes the E-CID positioning measurement, the positioning measurement result is returned to the Evolved Serving Mobile Location Center (E-SMLC) in the determined timing advance report format.Type: ApplicationFiled: October 28, 2010Publication date: February 14, 2013Applicant: China Academy of Telecommunications TechnologyInventors: Dajun Zhang, Haiyang Quan, Jiayi Fang
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Patent number: 8366025Abstract: A shower head contains a body including an inflow passage, a plurality of distributing passages, and a first groove; a rotary disk including a second disc portion, a post portion extending, an opening; a first resilient element used to provide a driving force and a restoring force onto the rotary disk; a pushing member fixed in the rotary disk and including a number of second ratchet blocks; a second resilient element used to provide the restoring force onto the pushing member after releasing the pulling force; a pulling device served to provide the pulling force on the pushing member and including an external portion extending from the body to be forced and an internal portion located at the body to be pulled, the internal portion at least containing a pull line member with a suitable length to insert through the inflow passage of the body.Type: GrantFiled: April 15, 2011Date of Patent: February 5, 2013Assignee: Globe Union Industrial Corp.Inventors: Mengfeng Cheng, Shengping Hu, Dajun Zhang
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Publication number: 20120287838Abstract: The present invention discloses a method and system for determining a mapping relation between the MBSFN area and the service area, wherein the method includes: an eNB sends an M2 setup request message to an MCE; the MCE allocates MBSFN area identities and sends a message with a mapping relation between the MBSFN area and the service area to the eNB; and the eNB acquires the mapping relation between the MBSFN area and the service. By the technical scheme of the invention, the mapping relation between the MBSFN area and the MBMS area can be defined, thus ensuring the synchronization transmission demand of the MBSFN with air interfaces.Type: ApplicationFiled: January 11, 2011Publication date: November 15, 2012Applicant: CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGYInventors: Dajun Zhang, Xiaodong Yang
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Publication number: 20120261488Abstract: A shower head contains a body including an inflow passage, a plurality of distributing passages, and a first groove; a rotary disk including a second disc portion, a post portion extending, an opening; a first resilient element used to provide a driving force and a restoring force onto the rotary disk; a pushing member fixed in the rotary disk and including a number of second ratchet blocks; a second resilient element used to provide the restoring force onto the pushing member after releasing the pulling force; a pulling device served to provide the pulling force on the pushing member and including an external portion extending from the body to be forced and an internal portion located at the body to be pulled, the internal portion at least containing a pull line member with a suitable length to insert through the inflow passage of the body.Type: ApplicationFiled: April 15, 2011Publication date: October 18, 2012Inventors: Mengfeng Cheng, Shengping Hu, Dajun Zhang
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Publication number: 20120218932Abstract: A method, a device and a system for synchronizing a Multimedia Broadcast Multicast Service (MBMS) are provided. The method includes: receiving a synchronous control frame from a Broadcast Multicast Service Center (BM-SC) by a network side device, carrying a load condition of a data frame in a synchronous sequence within the synchronous control frame; determining the composing information of the Radio Link Control (RLC) Protocol Data Unit (PDU) according to the load condition of the data frame in a synchronous sequence by the network side device; determining the need of stopping transmitting the missed data frame according to the composing information of the RLC PDU by the network side device while the data frame missing.Type: ApplicationFiled: October 18, 2010Publication date: August 30, 2012Applicant: CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGYInventors: Dajun Zhang, Xiaodong Yang