Source: http://www.google.com/patents/US7373148?dq=7800613
Timestamp: 2014-07-26 16:31:23
Document Index: 51796540

Matched Legal Cases: ['art 420', 'art 410', 'art 430', 'art 420', 'art 410', 'art 420', 'art 430']

Patent US7373148 - Method for cell reselection in an MBMS mobile communication system - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign in<nobr>Advanced Patent Search</nobr>PatentsA cell reselection method by a user equipment (UE) receiving an MBMS service in a serving cell of a mobile communication system. The UE receives control data of the serving cell, including configuration information necessary for accessing MBMS control channels (MCCHs) of neighbor cells and control information...http://www.google.com/patents/US7373148?utm_source=gb-gplus-sharePatent US7373148 - Method for cell reselection in an MBMS mobile communication systemAdvanced Patent SearchPublication numberUS7373148 B2Publication typeGrantApplication numberUS 10/821,005Publication dateMay 13, 2008Filing dateApr 8, 2004Priority dateApr 9, 2003Fee statusPaidAlso published asCN1551677A, EP1467586A2, EP1467586A3, EP1467586B1, US20040202140Publication number10821005, 821005, US 7373148 B2, US 7373148B2, US-B2-7373148, US7373148 B2, US7373148B2InventorsSoeng-Hun Kim, Kook-Heui Lee, Kyeong-In Jeong, Sung-Oh HwangOriginal AssigneeSamsung Electronics Co., LtdExport CitationBiBTeX, EndNote, RefManPatent Citations (10), Non-Patent Citations (2), Referenced by (22), Classifications (8), Legal Events (2) External Links: USPTO, USPTO Assignment, EspacenetMethod for cell reselection in an MBMS mobile communication systemUS 7373148 B2Abstract A cell reselection method by a user equipment (UE) receiving an MBMS service in a serving cell of a mobile communication system. The UE receives control data of the serving cell, including configuration information necessary for accessing MBMS control channels (MCCHs) of neighbor cells and control information necessary for accessing an MBMS data transport channel (MTCH) of the serving cell, over an MCCH of the serving cell, and stores the received control data, while the MBMS service is provided in the serving cell. If cell reselection to a target cell, which is one of the neighbor cells is determined, the UE moves to the target cell by utilizing configuration information stored for the target cell.
receiving second system information including a spreading factor, a code number, and a transport format set (TES) of a code channel to which the MCCH of the serving cell is mapped; and
measuring qualities of signals from the serving cell and the neighbor cells;
13. The cell reselection method of claim 12, wherein the service criterion is satisfied when the measured RSCP is larger than a first minimum value provided from the serving cell and the measured Ec/No is larger than a second minimum value provided from the serving cell.
transmitting a control data including configuration information necessary for accessing MBMS control channels (MCCHs) of neighbor cells and control information necessary for accessing an MBMS data transport channel (MTCH) of the serving cell, over the secondary common control channel of the serving cell, while providing the MBMS service over the MTCH of the serving cell.
22. A cell reselection method by a user equipment (UB) receiving a Multimedia BroadcastMulticast Service (MBMS) service in a serving cell in a mobile communication system including a plurality of cells and providing the MBMS service, the method comprising the steps of:
29. The method of claim 26, wherein the control information includes a spreading factor, a code number, and a transport format set (TFS) of a code channel to which the MCCH of the cell is mapped, a service identifier for each MBMS service provided in the cell, packet data convergence protocol (PDCP) information for an MBMS stream, and radio link control (RLC) information for the MBMS stream. Description
PRIORITY This application claims priority under 35 U.S.C. � 119 to an application entitled �Method for Achieving Cell Reselection by User Equipment in an MBMS Mobile Communication System� filed in the Korean Intellectual Property Office on Apr. 9, 2003 and assigned Serial No. 2003-22317, and an application entitled �Method for Achieving Cell Reselection by User Equipment in an MBMS Mobile Communication System� filed in the Korean Intellectual Property Office on Apr. 15, 2003 and assigned Serial No. 2003-23739, the contents of both of which are incorporated herein by reference.
FIG. 1 is a diagram schematically illustrating a network configuration for providing an MBMS service in a mobile communication system. Referring to FIG. 1, a multicast/broadcast-service center (MB-SC) 110 provides an MBMS stream, and the MS-SC 110 schedules an MBMS service stream and sends the scheduled MBMS service stream to a transit network (NW) 120. The transit network 120 is a network existing between the MB-SC 110 and a serving GPRS support node (SGSN) 130, which sends the MBMS service stream provided from the MB-SC 110 to the SGSN 130. The transit network 120 is comprised of a gateway GPRS support node (GGSN) and an external network.
A cell 1, which belongs to the Node B 160 that is requesting a particular MBMS service, includes the UE1 161, the UE2 162, and the UE3 163, and a cell 2, which belongs to the Node B 170, includes the UE4 171 and the UE5 172. Herein, the term �cell� has a meaning similar to that of the term �Node B.� The RNC 140 controls radio channels set up between the Node Bs 160 and 170 and the UEs 161, 162, 163, 171, and 172 in order to provide the MBMS service. As illustrated in FIG. 1, one radio channel is established between one Node B and UEs belonging to the Node B in order to provide an MBMS service.
SUMMARY OF THE INVENTION It is, therefore, an object of the present invention to provide a method for seamlessly receiving an MBMS service while a UE moves between cells.
FIG. 1 is a diagram schematically illustrating a configuration of a conventional mobile communication system supporting an MBMS service;
FIG. 2 is a diagram illustrating a cell reselection problem occurring in a UE receiving an MBMS service;
FIG. 3 is a diagram illustrating a format of a primary common control physical channel (P-CCPCH) according to the present invention;
FIG. 4 is a diagram illustrating a format of a secondary common control physical channel (S-CCPCH) according to the present invention;
FIG. 5 is a flowchart illustrating a cell reselection operation of a UE in a conventional mobile communication system;
FIG. 6 is a flowchart illustrating a cell reselection operation of a UE in a mobile communication system supporting an MBMS service according to the present invention;
FIG. 7 is a diagram illustrating a format of system information blocks (SIBs) according to a first embodiment of the present invention;
FIGS. 8A and 8B are flowcharts illustrating a cell reselection operation of a UE according to the first embodiment of the present invention;
FIG. 9 is a diagram illustrating a format of SIBs according to a second embodiment of the present invention;
FIG. 10 is a diagram illustrating a format of a primary common control physical channel (P-CCPCH) and a secondary common control physical channel (S-CCPCH) according to the second embodiment of the present invention;
FIGS. 11A and 11B are flowcharts illustrating a cell reselection operation of a UE according to the second embodiment of the present invention;
FIG. 12 is a diagram illustrating a format of SIBs according to a third embodiment of the present invention; and
FIGS. 13A to 13C are flowcharts illustrating a cell reselection operation of a UE according to the third embodiment of the present invention.
In the present invention, a UE receiving an MBMS service previously stores MBMS service-related information of neighbor cells to which it can move, thereby preventing call delay at cell reselection. In the specification, the term �MBMS service-related information� refers to information necessary for receiving the MBMS service in neighbor cells, and includes information related to a traffic channel and a control channel for the MBMS service.
FIG. 2 is a diagram schematically illustrating a procedure for performing cell reselection by a UE using an MBMS service while moving from one cell to another cell. As illustrated in FIG. 2, a cell 1 160 supports an MBMS service through a primary common control physical channel (P-CCPCH) 165, a secondary common control physical channel (S-CCPCH) 166, and an MBMS transport channel (MTCH) 164. Similarly, a cell 2 170 supports an MBMS service through a P-CCPCH 175, an S-CCPCH 176, and an MTCH 173. The MTCHs 164 and 173 carry MBMS service traffic, or data streams. It is assumed herein that the cell 1 160 and the cell 2 170 are controlled by one RNC 140. A UE1 161 receiving the MBMS service from the cell 1 160 moves to the cell 2 170 under the control of the RNC 140 if a signal transmitted from the cell 2 170 satisfies a predetermined condition. Such inter-cell movement is called �cell reselection.�
FIG. 3 is a diagram illustrating a format of the P-CCPCHs 165 and 175. Referring to FIG. 3, the P-CCPCH transmits system information of a corresponding cell, and uses a first code C(256,1) among 256 orthogonal variable spreading factor (OVSF) codes available for the corresponding cell. More specifically, the P-CCPCH transmits one master information block (MIB) and one system information block (SIB) for each 80-ms period.
FIG. 4 is a diagram illustrating a format of the S-CCPCHs 166 and 176. Referring to FIG. 4, the S-CCPCH is mapped with common transport channels such as a forward access channel (FACH) and a paging channel (PCH) for an upper layer. Each radio frame of the S-CCPCH is comprised of 15 slots, and each slot includes a data part 420, a transport format combination indicator (TFCI) part 410, and a pilot part 430. The data part 420 receives (contains) data on a FACH or a PCH. The TFCI part 410 receives TFCI information indicating a transport format (TF) of data transmitted over the data part 420. The pilot part 430 receives pilot bits, which are identification information of a corresponding cell.
FIG. 5 is a flowchart illustrating a procedure performed while a UE not having a dedicated channel moves from one cell to another cell in an MBMS communication system. Here, �not having a dedicated channel� means that the UE is in any one of an idle mode, a Cell_PCH state, a Cell_FACH state, or a URA_PCH state.
A channel carrying a data stream for an MBMS service is called an MBMS transmit channel (MTCH). When the MTCH is matched with a particular MBMS stream, if a plurality of MBMS services are provided to one cell, a plurality of MTCHs are established in the cell. In order to receive an MTCH, a UE first receives information transmitted over an MBMS control channel (MCCH). The MCCH provides control information that must be established to receive information necessary for reception of an MTCH and the MTCH. In the present invention, information carried by the MCCH will be referred to as �MTCH control information� or �MTCH data.�
FIG. 6 is a flowchart illustrating a procedure for performing cell reselection by a UE in an MBMS communication system according to the present invention. Referring to FIG. 6, in step 610, a UE collects, from a serving cell, information on neighbor cells and information needed to determine a criteria MBMS condition. Such information is collected using either SIB 3 and SIB 4, or SIB 11 and SIB 12, or using a new SIB. A description will now be made of the collection using SIB 3 and SIB 4, or the SIB 11 and SIB 12.
S_rxlev>0 and S_qual>0 S_rxlev=Q_rxlevmeas−Q_rxlevmin S_qual=Q_qualmeas−Q_qualmin
R � s=Q_meas� s+Q_hyst� s R � n=Q_meas� n−Q_offset� s � n In the foregoing formulas, Q_meas_s denotes Q_rxlevmeas or Q_qualmeas of the serving cell. Q_meas_n denotes Q_rxlevmeas or Q_qualmeas of neighbor cells. Q_hyst_s is a value given by the SIB 3/4 and denotes a weight for giving higher priority to the serving cell rather than the neighbor cells. Q_offset_s_n is a value given for neighbor cells by the SIB 11/12 and serves to give priority for cell reselection to each cell. For example, an RNC designates Q_offset_s_n of a neighbor cell �b� having high cell reselection priority to a value lower than that of a neighbor cell �a� having relatively higher priority.
First Embodiment FIG. 7 is a diagram illustrating a format of SIBs according to a first embodiment of the present invention. In the first embodiment, MTCH control information is transmitted over a P-CCPCH. In the first embodiment, SIB_MTCH 730 is used, which contains information necessary for reception of MTCH and is transmitted over P-CCPCH.
The SIB 11/12 720 includes information on neighbor cells. The information on the neighbor cells includes Q_offset_s_n 721 for each of the neighbor cells, information 722 necessary for reception of P-CPICH, and MBMS availability information MBMS_availability 723. The Q_offset_s_n 721 is a value for giving separate reselection priority to each cell. The P-CPICH information 722 serves as a cell ID and includes primary scrambling code information of a corresponding cell. The MBMS_availability 723 is information indicating whether an MBMS service is available in a corresponding neighbor cell. If a particular neighbor cell does not provide an MBMS service, the UE does not consider the neighbor cell as a candidate cell even though the neighbor cell satisfies a criteria MBMS condition. Here, the phrase �considering a neighbor cell as a candidate cell� means that the UE receives MTCH-related control information of a corresponding neighbor cell and previously stores the received control information.
FIGS. 8A and 8B are flowcharts illustrating an operation of a UE according to a first embodiment of the present invention. First, a method of acquiring MTCH-related control information of neighbor cells by a UE will be described with reference to FIG. 8A. It is assumed herein that the UE has already acquired SIB 3/4 and SIB 11/12 of a serving cell while receiving an MBMS service in the serving cell.
After measuring Q_qualmeas and Q_rxlevmeas, the UE determines whether one of the neighbor cells satisfies a criteria MBMS condition in step 825. The �criteria MBMS condition� indicates that the RSCP measurement value Q_rxlevmeas is larger than the minimum P-CPICH RSCP value Q_rxlevmin detected through the SIB 3/4, and the Ec/No measurement value Q_qualmeas is larger than the minimum P-CPICH Ec/No value Q_qualmin detected through the SIB 3/4.
If there are neighbor cells satisfying the condition that the RSCP measurement value Q_rxlevmeas is larger than the minimum RSCP value Q_rxlevmin and the Ec/No measurement value Q_qualmeas is larger than the minimum Ec/No value Q_qualmin, the UE regards the neighbor cells satisfying the criteria MBMS condition as candidate cells, and then proceeds to step 830. However, if there are no candidate cells, the UE returns to step 820. In this case, the UE can use MBMS availability information of the neighbor cells included in the SIB 11/12 before being transmitted. That is, the UE proceeds to step 830 only when the MBMS availability of the neighbor cells is �TRUE�, and the UE returns to step 820 when the MBMS availability is �FALSE�.
In step 845, if MTCH control information for an MBMS service that the UE desires to receive exists in the SIB_MTCH, the UE stores the MTCH control information as MTCH_INFO, and then returns to step 820 FIG. 8B is a flowchart illustrating a procedure for reselecting a particular target cell by a UE. The procedure of FIG. 8B is performed in parallel with or after the procedure of FIG. 8A.
Second Embodiment Accordingly, a second embodiment of the present invention is provided, which resolves the above-described shortcoming of the first embodiment. In the second embodiment MBMS service-related information is broadcast over an S-CCPCH in order to resolve the capacity problem of the P-CCPCH. In the second embodiment, MCCH control information for an MBMS service is periodically transmitted over an MCCH mapped to the S-CCPCH. Scheduling information of the MCCH is transmitted over an SIB_MCCH of the P-CCPCH. The S-CCPCH-related information is transmitted to UEs in a cell through SIB 5/6.
FIG. 9 is a diagram illustrating information necessary for supporting the second embodiment of the present invention. Referring to FIG. 9, scheduling information of MCCH is notified to UEs in a cell over SIB_MCCH 905. MCCH data 920 is transmitted over S-CCPCH. Because a format of the S-CCPCH can be formed in various ways for individual cells, a method for mapping MCCH to the S-CCPCH can also be defined in various ways.
FIG. 10 is a diagram illustrating a preferred example of transmitting MCCH data, and in this example, the MCCH data is mapped in a particular time period of S-CCPCH. Referring to FIG. 10, when a target cell is selected in order to receive an MBMS service, UEs acquires S-CCPCH-related information through SIB 5/6 910 transmitted over a P-CCPCH of the selected target cell. Further, the UE acquires scheduling information of the MCCH mapped to the S-CCPCH through SIB_MCCH 905 transmitted over P-CCPCH of the target cell. Then the UE receives MTCH control information transmitted over the MCCH 920 using the scheduling information.
FIGS. 11A and 11B are flowcharts illustrating an operation of a UE according to the second embodiment of the present invention. First, an operation of acquiring MTCH control information of neighbor cells by a UE will be described with reference to FIG. 11A. It is assumed herein that the UE has already acquired SIB 3/4 and SIB 11/12 of a serving cell while using an MBMS service in the serving cell. The SIB 3/4 includes a criteria MBMS parameter for designating a reception time of MCCH control information for neighbor cells and cell reselection criteria. The SIB 11/12 includes information of neighbor cells which become measurement objects, specifically, includes cell IDs and P-CPICH information. Information included in the SIB 3/4 and SIB 11/12 has already been described with reference to FIG. 7.
After measuring Q_qualmeas and Q_rxlevmeas for the neighbor cells, the UE determines whether one of the neighbor cells satisfies a criteria MBMS condition in step 1025. The �criteria MBMS condition� indicates that the RSCP measurement value Q_rxlevmeas is larger than the minimum P-CPICH RSCP value Q_rxlevmin detected through the SIB 3/4, and the Ec/No measurement value Q_qualmeas is larger than the minimum P-CPICH Ec/No value Q_qualmin detected through the SIB 3/4.
FIG. 11B is a flowchart illustrating a procedure for reselecting a particular target cell by a UE. The procedure of FIG. 11B is performed in parallel with or after the procedure illustrated in FIG. 11A.
Third Embodiment A third embodiment of the present invention provides a method for transmitting MCCH configuration information of neighbor cells over an MCCH of a serving cell so that a UE can access the MCCH of the neighbor cells without receiving MIB, SIB_MCCH, and SIB 5/6 of the neighbor cells. Because the UE can directly receive MCCH data of a candidate cell using previously stored MCCH configuration information when a particular neighbor cell is recognized as the candidate cell, it is possible to reduce a time required for acquiring MTCH information.
FIG. 12 is a diagram illustrating information necessary for supporting the third embodiment of the present invention. Referring to FIG. 12, MCCH data 1110 includes MCCH configuration information MCCH_Neighbor_info 1115 of neighbor cells and MTCH control information MTCH_info 1120 of a serving cell. The MTCH control information 1120 includes information 1121 and 1122 for MBMS services provided in a corresponding serving cell. The MCCH configuration information 1115 includes information for neighbor cells.
The MCCH_Neighbor info 1115 includes, for each neighbor cell, a primary scrambling code (SC), S-CCPCH information of FACH/PCH TFCS, PCH/FACH TFS, SF and Code Number, to which MCCH is mapped, and MCCH scheduling information SIB_MCCHx_REP, SIB_MCCHx_POS, and SIB_MCCHx_COUNT of neighbor cells. Here, a letter �x� indicates a neighbor cell index. Scheduling information for MCCH of the serving cell is notified to UEs over SIB_MCCH 1105. The SIB_MCCH 1105 includes MCCH scheduling information such as MCCH_REP 1130, MCCH_POS 1132, and MCCH_COUNT 1134. The scheduling information of the serving cell and neighbor cells has already been described above with reference to FIG. 10.
FIGS. 13A to 13C are flowcharts illustrating an operation of a UE according to the third embodiment of the present invention. First, an operation of acquiring MTCH configuration information of neighbor cells by a UE in a serving cell will be described with reference to FIG. 13A.
After measuring Q_qualmeas and Q_rxlevmeas for the neighbor cells, the UE determines in step 1240 whether one of the neighbor cells satisfies a criteria MBMS condition given through the SIB 3/4. The �criteria MBMS condition� is that the RSCP measurement value Q_rxlevmeas is larger than the minimum P-CPICH RSCP value Q_rxlevmin detected through the SIB 3/4, and the Ec/No measurement value Q_qualmeas is larger than the minimum P-CPICH Ec/No value Q_qualmin detected through the SIB 3/4.
FIG. 13C is a flowchart illustrating a procedure for reselecting a particular target cell by a UE. The procedure illustrated in FIG. 13C is performed in parallel with or after the procedure of FIG. 13B.
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS5887252 *Sep 10, 1996Mar 23, 1999Nokia Mobile Phones LimitedMulticast transmission for DS-CDMA cellular telephonesUS6256300 *Apr 11, 2000Jul 3, 2001Lucent Technologies Inc.Mobility management for a multimedia mobile networkUS6731936 *Aug 20, 2001May 4, 2004Qualcomm IncorporatedMethod and system for a handoff in a broadcast communication systemUS6977914 *Dec 23, 2002Dec 20, 2005Nokia CorporationBroadcast hand-over in a wireless networkUS6980820 *Aug 20, 2001Dec 27, 2005Qualcomm Inc.Method and system for signaling in broadcast communication systemUS6993000 *Jun 19, 2001Jan 31, 2006Telcordia Technologies, Inc.Method for CDMA soft handoff via IP multicastingUS7061880 *Oct 11, 2001Jun 13, 2006Telefonaktiebolaget Lm Ericsson (Publ)Systems and methods for multicast communicationsUS7082116 *Dec 28, 2000Jul 25, 2006Nortel Networks LimitedMethods and systems implementing mobility support in a packet-based wireless access networkUS20030032462Jul 13, 2001Feb 13, 2003Jun WangMethod and system for improving battery performance in broadcast pagingWO2003017713A1Aug 15, 2002Feb 27, 2003Qualcomm IncMethod and system for a handoff in a broadcast communication system* Cited by examinerNon-Patent CitationsReference1LG Information & Communications, Ltd., Definitions and Characteristics of Multicast Channels, TSG-RAN Working Group 2, Mar. 8, 1999.2Universal Mobile Telecommunications System (UMTS); Multimedia Broadcast/Multicast Service (MBMS); ETSI Standards, Mar. 2002.Referenced byCiting PatentFiling datePublication dateApplicantTitleUS7546132 *Apr 18, 2005Jun 9, 2009Lg Electronics, Inc.Communication of point to multipoint service information in wireless communication systemUS7672261 *Dec 23, 2005Mar 2, 2010Lg Electronics Inc.Communicating data block in wireless communication systemUS7702355 *Dec 19, 2005Apr 20, 2010Telefonaktiebolaget L M Ericsson (Publ)Cell selection in broadcast and multicast communication environmentsUS8014376 *Jan 5, 2006Sep 6, 2011Lg Electronics, Inc.Managing channel configuration information in a wireless communication systemUS8185115 *Apr 23, 2010May 22, 2012Telefonaktiebolaget L M Ericsson (Publ)Tracking cells for cell-reselection in a cellular communications systemUS8249010Nov 2, 2009Aug 21, 2012Huawei Technologies Co., Ltd.Method and apparatus for feeding back and receiving acknowledgement information of semi-persistent scheduling data packetsUS8254299 *Mar 29, 2006Aug 28, 2012Lg Electronics Inc.Multimedia broadcast/multicast service cells reconfigurationsUS8400964Jan 19, 2010Mar 19, 2013Lg Electronics Inc.Communicating data block in wireless communication systemUS8428013Oct 30, 2007Apr 23, 2013Lg Electronics Inc.Method of performing random access in a wireless communcation systemUS8442017Oct 30, 2007May 14, 2013Lg Electronics Inc.Method for transmitting random access channel message and response message, and mobile communication terminalUS8463300Jun 18, 2008Jun 11, 2013Lg Electronics Inc.Paging information transmission method for effective call setupUS8493911Sep 19, 2008Jul 23, 2013Lg Electronics Inc.Method of restricting scheduling request for effective data transmissionUS8543089Apr 30, 2008Sep 24, 2013Lg Electronics Inc.Method for performing an authentication of entities during establishment of wireless call connectionUS8565182Dec 19, 2012Oct 22, 2013Huawei Technologies Co., LtdMethod and apparatus for feeding back and receiving acknowledgement information of semi-persistent scheduling data packetsUS8611899 *Aug 30, 2005Dec 17, 2013Kyocera CorporationBase station apparatus, wireless communication terminal apparatus, communication method and computer readable medium thereofUS8619685Oct 2, 2007Dec 31, 2013Lg Electronics Inc.Method for transmitting and receiving paging message in wireless communication systemUS8649366Dec 20, 2011Feb 11, 2014Lg Electronics Inc.Method of performing uplink synchronization in wireless communication systemUS20080273503 *May 1, 2008Nov 6, 2008Lg Electronics Inc.Method and terminal for performing handover in mobile communications system of point-to-multipoint serviceUS20100173653 *Mar 24, 2010Jul 8, 2010Qualcomm IncorporatedMethods and apparatus for mobile terminal-based radio resource management and wireless network optimizationUS20110076998 *Apr 4, 2008Mar 31, 2011Toby ProctorTelecommunications newtorks and devicesUS20110194477 *Aug 10, 2010Aug 11, 2011Qualcomm IncorporatedResource specification for broadcast/multicast servicesUS20110263254 *Apr 23, 2010Oct 27, 2011Ali NaderTracking Cells for Cell-Reselection in a Cellular Communications System* Cited by examinerClassifications U.S. Classification455/437, 370/331International ClassificationH04J13/00, H04W4/06, H04W36/08Cooperative ClassificationH04W72/005, H04W36/0061European ClassificationH04W72/00BLegal EventsDateCodeEventDescriptionSep 22, 2011FPAYFee paymentYear of fee payment: 4Apr 8, 2004ASAssignmentOwner name: SAMSUNG ELECTRONICS CO., LTD., KOREA, REPUBLIC OFFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KIM, SEONG-HUN;LEE, KOOK-HEUI;JEONG, KYEONG-IN;AND OTHERS;REEL/FRAME:015202/0859Effective date: 20040406RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google