Source: http://www.google.com/patents/US7720483?ie=ISO-8859-1&dq=2040248
Timestamp: 2015-02-01 21:50:15
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Matched Legal Cases: ['Application No. 10', 'art 110', 'art 110', 'art 110', 'arts 110', 'art 110']

Patent US7720483 - Apparatus and method for assigning sub-channels in an OFDMA system - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA sub-channel assignment apparatus and method of minimizing interference caused by sub-channel frequency overlaps when assigning sub-channels for sectors of a base station in an OFDMA system of a FDMA type. The apparatus includes: a plurality of sector channel management parts that assign at least one...http://www.google.com/patents/US7720483?utm_source=gb-gplus-sharePatent US7720483 - Apparatus and method for assigning sub-channels in an OFDMA systemAdvanced Patent SearchPublication numberUS7720483 B2Publication typeGrantApplication numberUS 11/545,602Publication dateMay 18, 2010Filing dateOct 11, 2006Priority dateOct 12, 2005Fee statusPaidAlso published asEP1775874A2, EP1775874A3, EP1775874B1, US20070081491Publication number11545602, 545602, US 7720483 B2, US 7720483B2, US-B2-7720483, US7720483 B2, US7720483B2InventorsDong Hun Kim, Jung Yun Lee, Keun Young KimOriginal AssigneeLg-Nortel Co., Ltd.Export CitationBiBTeX, EndNote, RefManPatent Citations (2), Referenced by (3), Classifications (18), Legal Events (3) External Links: USPTO, USPTO Assignment, EspacenetApparatus and method for assigning sub-channels in an OFDMA systemUS 7720483 B2Abstract A sub-channel assignment apparatus and method of minimizing interference caused by sub-channel frequency overlaps when assigning sub-channels for sectors of a base station in an OFDMA system of a FDMA type. The apparatus includes: a plurality of sector channel management parts that assign at least one channel having assignable channel indexes in response to requests from users in a sector managed by the sector channel management part, and report sector load information regarding the total number of the requests from the users in the sector; and a channel assignment scheduler for using the sector load information reported from each channel management part to calculate the number of assignable channels per class for each of the sectors, and determines the assignable channel indexes per class for each of the sectors according to the number of assignable channels, and forwards the assignable channel indexes to each of the sector channel management parts.
a plurality of sector channel management parts, each sector channel management part assigning channels having assignable channel indexes in response to requests from users in a sector managed by the respective sector channel management part, and reporting sector load information regarding a total number of the requests from the users in the sector and channel quality information that includes signal to noise ratios for each of the channels currently in use; and
a channel assignment scheduler, the channel assignment scheduler using the sector load information and the channel quality information reported from each of the channel management parts to calculate a number of assignable channels per class for each of the sectors, to determine the assignable channel indexes per class for each of the sectors according to the number of assignable channels, and to forward the assignable channel indexes to each of the sector channel management parts.
wherein said class is a group consisting of channels to be assigned to a same number of sectors, and wherein each of the sector channel management parts generates and reports the sector load information on every frame, and wherein the channel assignment scheduler generates the assignable channel indexes for each of the sectors for every frame and forwards the assignable channel indexes to each of the sector channel management parts.
2. An apparatus capable of assigning sub-channels in an Orthogonal Frequency Division Multiplexing Access (OFDMA) system with a plurality of sectors, comprising:
a channel assignment scheduler, the channel assignment scheduler using the sector load information and the channel quality information reported from each of the channel management parts to calculate a number of assignable channels per class for each of the sectors, to determine the assignable channel indexes per class for each of the sectors according to the number of assignable channels, and to forward the assignable channel indexes to each of the sector channel management parts,
wherein said class is a group consisting of channels to be assigned to a same number of sectors, and the channel assignment scheduler calculates the number of assignable channels to set the number of sub-channels of a class with sub-channels not assigned to any of the sectors to 0 and to maximize the number of sub-channels of a class with sub-channels assigned to all of the sectors.
3. An apparatus capable of assigning sub-channels in an Orthogonal Frequency Division Multiplexing Access (OFDMA) system with a plurality of sectors, comprising:
wherein said class is a group consisting of channels to be assigned to a same number of sectors, and the channel assignment scheduler calculates the number of assignable channels to set the number of sub-channels of a class with sub-channels not assigned to any of the sectors to 0 and to minimize the number of sub-channels of a class with sub-channels assigned to all of the sectors.
4. The apparatus of claim 3, wherein when the sector load information indicates that a sum of the cell loads for each of the sectors is smaller than or equal to 1, the channel assignment scheduler calculates the number of assignable channels per class for each of the sectors such that the number of sub-channels of a class with sub-channels assigned to multiple sectors is set to 0 and a ratio of the numbers of sub-channels of a class with sub-channels assigned to only one sector among the plurality of sectors corresponds to a ratio of the cell loads of each of the sectors.
5. The apparatus of claim 3, wherein when the sector load information indicates that the sum of the cell loads of each of the sectors is greater than one and smaller than or equal to 2, the channel assignment scheduler calculates the number of assignable channels per class for each sector such that a ratio of the numbers of sub-channels of a class with sub-channels assigned to only one sector among the plurality of sectors corresponds to a ratio of the cell loads of each of the sectors, and a ratio of the numbers of sub-channels of a class with sub-channels assigned to multiple sectors among the plurality of sectors corresponds to the ratio of the numbers of sub-channels of a class with sub-channels assigned to only one sector among the plurality of sectors.
6. The apparatus of claim 3, wherein when the sector load information indicates that the sum of the cell loads of each of the sectors is greater than 2 but smaller than or equal to 3, the channel assignment scheduler calculates the number of channels assignable per class for each of the sectors using a ratio of the cell loads of each of the sectors to maximize the number of sub-channels of a class with sub-channels assigned to 2 sectors.
7. A method of assigning sub-channels in an Orthogonal Frequency Division Multiplexing Access (OFDMA) system, comprising:
receiving reports from each of a plurality of sector channel management parts on sector load information regarding a number of channel assignment requests from users in sectors managed by each of the sector channel management parts and channel quality information that includes signal to noise ratios for each of the channels currently in use,
calculating a number of assignable channels per class for each of the sectors by using the sector load information and the channel quality information of each of the sectors,
wherein the class is a group consisting of channels assigned to a same number of sectors, and wherein the calculating the number of assignable channels calculates the number of assignable channels such that a number of sub-channels of a class with sub-channels not assigned to any of the sectors is set to 0 and the number of sub-channels of a class with sub-channels assigned to all of the sectors is set to a maximum.
8. A method of assigning sub-channels in an Orthogonal Frequency Division Multiplexing Access (OFDMA) system, comprising:
wherein the class is a group consisting of channels assigned to a same number of sectors, and wherein the calculating the number of assignable channels calculates the number of assignable channels such that a number of sub-channels of a class with sub-channels not assigned to any of the sectors is set to 0 and the number of sub-channels of a class with sub-channels assigned to all of the sectors is set to a minimum.
9. The method of claim 8, wherein when the sector load information indicates that a sum of the cell loads for each of the sectors is smaller than or equal to 1, the calculating the number of assignable channels calculates the number of assignable channels per class for each of the sectors such that the number of sub-channels of a class with sub-channels assigned to multiple sectors is set to 0 and a ratio of the number of sub-channels of a class with sub-channels assigned to only one sector among the plurality of sectors corresponds to a ratio of the cell loads of each of the sectors.
10. The method of claim 8, wherein when the sector load information indicates that a sum of the cell loads of each of the sectors is greater than one and smaller than or equal to 2, the calculating the number of assignable channels calculates the number of assignable channels per class for each sector such that a ratio of the number of sub-channels of a class with sub-channels assigned to only one sector among the plurality of sectors corresponds to a ratio of the cell loads of each of the sectors, and a ratio of the number of sub-channels of a class with sub-channels assigned to multiple sector among the plurality of sectors corresponds to the ratio of the number of sub-channels of a class with sub-channels assigned to only one sector among the plurality of sectors.
11. The method of claim 10, wherein, when 3 sectors (sector A, sector B, sector C) exist, the calculating the number of assignable channels calculates the numbers of sub-channels of a class with sub-channels assigned to only one sector using the equations (1), (2) and (3):
Sa = Wa ( 2 - ( Wa + Wb + Wc ) ) Wa + Wb + Wc , ( 1 ) Sb = Wb ( 2 - ( Wa + Wb + Wc ) ) Wa + Wb + Wc , ( 2 ) Sc = Wc ( 2 - ( Wa + Wb + Wc ) ) Wa + Wb + Wc ( 3 ) (where, Sa, Sb, Sc is the number of sub-channels of each of the sectors A, B, and C respectively, and Wa, Wb, Wc is a cell load of sectors A, B, and C respectively),
(where, Sab, Sba are the numbers of sub-channels multiply assigned to sectors A and B, Sbc, Scb are the numbers of sub-channels multiply assigned to sectors B and C, Sca, Sac are the numbers of sub-channels multiply assigned to sectors C and A).
12. The method of claim 8, wherein when the sector load information indicates that a sum of the cell loads of each of the sectors is greater than 2 and smaller than or equal to 3, the calculating the number of assignable channels calculates the number of channels assignable per class for each of the sectors using a ratio of the cell loads of each of the sectors to maximize the number of sub-channels of a class with sub-channels assigned to 2 sectors.
13. The method of claim 10, wherein, when 3 sectors (sector A, sector B, sector C) exist, the calculating the number of assignable channels calculates the numbers of sub-channels of a class with sub-channels assigned to all the sectors (Class 3) using equations (7), (8) and (9):
Ta = Wa ( Wa + Wb + Wc - 2 ) Wa + Wb + Wc , ( 7 ) Tb = Wb ( Wa + Wb + Wc - 2 ) Wa + Wb + Wc , ( 8 ) Tc = Wc ( Wa + Wb + Wc - 2 ) Wa + Wb + Wc ( 9 ) (where, Ta, Tb, Tc are the number of sub-channels of class 3 for each of the sectors A, B, C respectively, and Wa, Wb, Wc are a cell load of each of the sectors A, B, C respectively),
Sab = Sba = Wa + Wb - Wc - ( Ta + Tb + Tc ) 2 , ( 10 ) Sbc = Scb = Wb + Wc - Wa - ( Ta + Tb + Tc ) 2 , ( 11 ) Sca = Sac = Wc + Wa - Wb - ( Ta + Tb + Tc ) 2 ( 12 ) (where, Sab, Sba are the numbers of sub-channels multiply assigned to sector A and B, Sbc, Scb are the numbers of sub-channels multiply assigned to sectors B and C, Sca, Sac are the numbers of sub-channels multiply assigned to sectors C and A). Description
This Non-Provisional Application claims priority under 35 U.S.C. �119(a) to Korean Patent Application No. 10-2005-0095938 filed in Korea on Oct. 12, 2005. Which is hereby incorporated by reference.
FIG. 2 is a diagram illustrating a case of sub-channels randomly assigned in a conventional OFDMA system. The first sub-channel assignment method illustrated in FIG. 2 is a conventional random assignment method. When the total sum of the cell loads of each sector is greater than 1 (�+�+�=1.5), not only are there sub-channels of class 0 which are not assigned to any of the sectors (channel indexes 43-48), but there are also a lot of sub-channels that are inefficiently assigned. This increases the number of sub-channels of class 2 (a group of sub-channels assigned to 2 sectors, channel indexes 7-18, 25-30) and the number of sub-channels of class 3 (a group of sub-channels assigned to all sectors, channels indexes 1-6). Thus, the interference phenomenon caused by the frequency overlap cannot be efficiently managed.
SUMMARY OF THE INVENTION Embodiments according to the present invention provide an OFDMA system with a base station or controller adapted to collect and analyze information on used channels and load of each sector to assign sub-channels to each sector.
FIG. 4 is a diagram illustrating a case where sub-channels are assigned to set the number of sub-channels of Class 0 to �0� and the number of sub-channels of Class 3 to maximum according to an exemplary embodiment of the present invention.
FIG. 5 is a diagram illustrating a case where sub-channels are assigned to set the number of sub-channels of Class 0 to �0� and the number of sub-channels of Class 3 to minimum according to an exemplary embodiment of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Henceforth, the preferred embodiments of the present invention will be described in detail in connection with the attached drawings.
The channel assignment scheduler 120 located in the base station or controller controls each sector channel management part 110 a, 110 b, 110 c to thereby control the sub-channel assignment for each of the sectors managed by the base station on every frame. The channel assignment scheduler collects and analyzes the sector load information reported from each sector channel management part 110 a, 110 b, 110 c on every frame and calculates the number of assignable channels per class for each of the sectors and the number of assignable channels per sectors to be assigned for the respective classes. Also, the channel assignment scheduler 120 determines the assignable channel indexes per class for each of the sectors and per sectors to be assigned for the respective classes according to the calculation result on the number of assignable channels and the channel quality information reported with the sector load information from each of the sector channel management parts. The channel assignment scheduler 120 forwards the assignable channel indexes information per class for each of the sectors and/or per sectors to be assigned for the respective classes determined as such, thereby controlling the sub-channel assignment of each sector channel management part 110 a, 110 b, 110 c. In the base station consisting of aforementioned multiple sectors, if the sum of the cell loads of each sector is greater than 1, then a sub-channel that is multiply assigned (i.e., sub-channel assigned to multiple sectors) inevitably arises. Thus, in order to minimize the interference phenomenon caused by the frequency overlap of the sub-channels assigned to the multiple sectors, the number of assignable channels (i.e., number of sub-channels) per class and/or per sector to be assigned for each of the classes is calculated. In such a case, the number of sub-channels of class 0 should be �0� to maximize the sub-channel assignment efficiency. Also, the number of sub-channels multiply assigned to other sectors, such as the sub-channels of class 2 or 3, should be minimized in order to reduce the sub-channel interference.
FIG. 4 is a diagram illustrating a case where the sub-channels are assigned to set the number of sub-channels of class 0 to �0� and the number of sub-channels of class 3 to maximum, according to an exemplary embodiment of the present invention. FIG. 5 is a diagram illustrating a case where the sub-channels are assigned to set the number of sub-channels of class 0 to �0� and the number of sub-channels of class 3 to minimum according to an exemplary embodiment of the present invention.
For example, as to the cell construction shown in FIG. 1, the cell loads of sectors A, B and C, which are managed by the base station, are defined as Wa, Wb and Wc, respectively. In this instance, the channel assignment scheduler 120 collects and analyzes the load information reported from each of the sectors. When the sum of the cell loads is smaller than or equal to 1 (Wa+Wb+Wc<=1), this implies that the total number of channels requested by all the users in the sectors are smaller than or equal to the total number of assignable channels. Thus, when assigning the sub-channels, the sub-channels can be assigned without any sub-channels being multiply assigned. That is, the number of sub-channels of classes 2 and 3 (a group of sub-channels multiply assigned to sectors 2 and 3, respectively) can be made to �0�. Also, the number of sub-channels of class 0 (a group of sub-channels assigned to only one sector) can be made to correspond to the cell loads of each sector. By doing so, the assignable channel indexes per each sector and per each class can be determined. For example, assuming that the cell load of sector A (Wa) is 10/48, the cell load of sector B (Wb) is 15/48 and the cell load of sector C (Wc) is 20/48, since the total cell load of all sectors (Wa+Wb+Wc) is smaller than 1 (the total cell load is 45/48), the number of sub-channels of classes 2 and 3 will be made to 0 while the number of sub-channels of class 1 is calculated to be the value matching the total cell load for all the sectors (that is, 45). Among the sub-channels of class 1, 10 channel indexes are assigned to sector A, 15 channel indexes are assigned to sector B, and 20 channel indexes are assigned to sector C. Then, the information per sector and per class are forwarded to the corresponding sector channel management parts 110 a, 110 b, 110 c, to thereby control the sub-channel assignment, such that each sector channel management part does not multiply assign the sub-channels.
By doing so, the total number of sub-channels of class 1 becomes Sa+Sb+Sc, and the total number of sub-channels of class 2 becomes
( Wa - Sa ) + ( Wb - Sb ) + ( Wc - Sc ) 2 . In such a case, to make the number of sub-channels of class 0 (the group of sub-channels not assigned to any of the sectors) to 0, the condition
Sa + Sb + Sc + ( Wa - Sa ) + ( Wb - Sb ) + ( Wc - Sc ) 2 = 1 must be satisfied. Since the ratio of the number of sub-channels of class 1 is equal to the ratio of the cell loads of each sector (that is, �Sa:Sb:Sc=Wa:Wb:Wc�), the number of sub-channels of each sector becomes
Sa = Wa Wa + Wb + Wc S , Sb = Wb Wa + Wb + Wc S , Sc = Wc Wa + Wb + Wc S . Also, since the total number of sub-channels of class 1 is �S=2−(Wa+Wb+Wc),� the number of class 1 sub-channels of each sector calculated above, Sa, Sb, Sc, can be represented as equation 1 shown below.
Sa = Wa ( 2 - ( Wa + Wb + Wc ) ) Wa + Wb + Wc Sb = Wb ( 2 - ( Wa + Wb + Wc ) ) Wa + Wb + Wc Sc = Wc ( 2 - ( Wa + Wb + Wc ) ) Wa + Wb + Wc [ Equation 1 ] The number of class 2 sub-channels of sector A multiply assigned to sector B is defined as Sab. The number of sub-channels multiply assigned to other sectors can be similarly defined. In summary, they are defined as Sab, Sac, Sba, Sbc, Sca, Scb, wherein �Sab=Sba�, �Sac=Sca�, �Sbc=Scb.�
Sab=Sba=1−(Sa+Sb+Wc) Sbc=Scb=1−(Sb+Sc+Wa) Sca=Sac=1−(Sc+Sa+Wb) [Equation 2]
The assignable channel indexes per class for each of the sectors and per sectors to be assigned for the respective classes are determined by the channel assignment scheduler 120, according to the calculated result for the number of assignable channels as shown below: For sector A, channel indexes 1-5, 13-20 are determined as assignable for the sub-channels of class 2 (Sab, Sac) and channel indexes 6-12 are determined as assignable for the sub-channels of class 1 (Sa), wherein such information on the assignable channel indexes are forwarded to the sector channel management part of sector A, 110 a. For sector B, channel indexes 13-20, 26-28 are determined as assignable for the sub-channels of class 2 (Sba, Sbc) and channel indexes 21-25 are determined as assignable for the sub-channels of class 1 (Sb), wherein such information on the assignable channel indexes are forwarded to the sector channel management part of sector B, 110 b. For sector C, channel indexes 1-5, 26-28 are determined as assignable for the sub-channels of class 2 (Sca, Scb) and channel indexes 29-32 are determined as assignable for the sub-channels of class 1 (Sc), wherein such information on the assignable channel indexes are forwarded to the sector channel management part of sector C, 110 c. FIGS. 8 and 9 are diagrams exemplifying the sub-channel assignment method of FIG. 5 when the sum of the cell loads of each sector is greater than 2 but smaller than or equal to 3. When the channel assignment scheduler 120 collects and analyzes the load information reported from each sector channel management part 110 a, 110 b, 110 c, to find that the sum of the cell loads of each sector is greater than 2 but smaller than or equal to 3 (that is, 2<Wa+Wb+Wc≦3), this implies that there must inevitably be the sub-channels of class 3 (group of sub-channels multiply assigned to 3 sectors). Thus, it is preferable to maximize the number of sub-channels of class 2 (sub-channels multiply assigned to 2 sectors) when assigning the sub-channels. To achieve this, preferably, the number of sub-channels of class 3 must be minimized. Also, the number of sub-channels of class 0 (sub-channels not assigned to any of the sectors) and class 1 (sub-channels assigned to only one of the sectors) must be �0�.
( Wa - Ta ) + Wb - Tb ) + ( Wc - Tc ) 2 = 1 is met. When examining the cell load of each sector, the cell load of sector A becomes �Wa=Sab+Sac+Ta+Tb+Tc,� the cell load of sector B becomes �Wb=Sba+Sbc+Ta+Tb+Tc,� and the cell load of sector C becomes �Wc=Sca+Scb+Ta+Tb+Tc.� Herein, �Sab, Sac, Sba, Sbc, Sca, Scb� correspond to the number of sub-channels multiply assigned to 2 sectors, which are different from each other, wherein �Sab=Sba�, �Sac=Sca� and �Sbc=Scb.�
Using the above equation for the cell loads of each sector to calculate the number of sub-channels of class 3, the equations
Ta = Wa Wa + Wb + Wc T , Tb = Wb Wa + Wb + Wc T , and Tc = Wc Wa + Wb + Wc T can be obtained. In such a case, since the total number of sub-channels of class 3 is �T=Wa+Wb+Wc−2,� the number of class 3 sub-channels of each sector Ta, Tb, Tc can be represented by equation 3 shown below.
Ta = Wa ( Wa + Wb + Wc - 2 ) Wa + Wb + Wc Tb = Wb ( Wa + Wb + Wc - 2 ) Wa + Wb + Wc Tc = Wc ( Wa + Wb + Wc - 2 ) Wa + Wb + Wc [ Equation 3 ] Further, as in the case where the sum of the cell loads of each sector is greater than 1 but smaller than or equal to 2, the number of sub-channels multiply assigned to other sectors in each sector can be found using equation 4 shown below. In equation 4 shown below, Sab and Sba are each the number of sub-channels multiply assigned to sectors A and B, Sbc and Scb are each the number of sub-channels multiply assigned to sectors B and C, and Sca and Sac are each the number of sub-channels multiply assigned to sectors C and A.
Sab = Sba = Wa + Wb - Wc - ( Ta + Tb + Tc ) 2 Sbc = Scb = Wb + Wc - Wa - ( Ta + Tb + Tc ) 2 Sca = Sac = Wc + Wa - Wb - ( Ta + Tb + Tc ) 2 [ Equation 4 ] When the sum of the cell loads of each sector is greater than 2 but smaller than or equal to 3 (that is, 2<Wa+Wb+Wc≦3), the channel assignment scheduler 120 calculates the number of assignable channels per class for each sector and the number of assignable channels per sectors to be assigned for the respective classes for every frame in a direction of minimizing the interference caused by the frequency overlap. Then, the channel assignment scheduler 120 determines the assignable channel indexes per class for each sector and per sectors to be assigned for the respective classes, according to the calculation results for the number of assignable channels.
If the sum of cell loads of each cell is determined to be smaller than or equal to 1, then the channel assignment scheduler 120 sets the number of sub-channels of classes 2 and 3 to �0� (S210). Since the total number of channels requested by the sectors is smaller than the number of total assignable channels, there is no need to assign the sub-channels of class 2 or 3. Then, the channel assignment scheduler 120 calculates the number of sub-channels of class 1 for each sector to correspond to the cell load of each sector (S220) and ends the procedure.
If the sum of the cell loads of each cell is determined not to be smaller than or equal to 1, then the channel assignment scheduler 120 determines whether the sum of the cell loads of each cell is larger than 1 but smaller than or equal to 2 (S230). If the sum of cell loads of each cell is determined to be larger than 1 but smaller than or equal to 2, then the channel assignment scheduler 120 sets the number of sub-channels of class 0 and 3 to �0� (S240). In this instance, the sum of the numbers of channels requested by each sector must be larger than the number of total assignable sub-channels, and there inevitably is a sub-channel multiply assigned to more than 2 sectors. Thus, the number of sub-channels of class 0 is set to �0� so as to avoid the waste of channel resources, while the number of sub-channels of class 3 is set to �0� in order to reduce the interference between the channels.
If the sum of cell loads of each cell is determined to be larger than 1 but smaller or equal to 2, then the channel assignment scheduler 120 sets the number of sub-channels of classes 0 and 1 to �0� (S270). In this instance, there inevitably must be a sub-channel of class 3 (group of sub-channels multiply assigned to all 3 sectors). Also, since the number of sub-channels of class 3 increases when there is a sub-channel of class 1, the number of sub-channels of class 1 is set to �0�.
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS20030169681 *Apr 17, 2001Sep 11, 2003Xiaodong LiMulti-carrier communications with group-based subcarrier allocationUS20050169229 *Dec 23, 2004Aug 4, 2005Samsung Electronics Co., Ltd.Apparatus and method for allocating subchannels adaptively according to frequency reuse rates in an orthogonal frequency division multiple access system* Cited by examinerReferenced byCiting PatentFiling datePublication dateApplicantTitleUS8531956 *May 29, 2010Sep 10, 2013Hewlett-Packard Development Company, L.P.Channel assignment for a wireless networkUS20110292886 *May 29, 2010Dec 1, 2011Jung Gun LeeChannel assignment for a wireless networkWO2012039858A2 *Aug 16, 2011Mar 29, 2012Xg Technology, Inc.Self organizing cellular networks* Cited by examinerClassifications U.S. Classification455/447, 455/450, 370/341, 370/329International ClassificationH04W40/00, H04W4/00, H04W72/00Cooperative ClassificationH04L5/0094, H04L5/0053, H04L5/0085, H04L5/0046, H04L5/0007, H04L5/0039, H04L5/006European ClassificationH04L5/00C2A, H04L5/00C7A, H04L5/00A2A1, H04L5/00C8ELegal EventsDateCodeEventDescriptionOct 25, 2013FPAYFee paymentYear of fee payment: 4Feb 24, 2011ASAssignmentFree format text: CHANGE OF NAME;ASSIGNOR:LG-NORTEL CO., LTD.;REEL/FRAME:025948/0842Owner name: LG-ERICSSON CO., LTD., KOREA, REPUBLIC OFEffective date: 20100630Oct 11, 2006ASAssignmentOwner name: LG-NORTEL CO., LTD., KOREA, REPUBLIC OFFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KIM, DONG HUN;LEE, JUNG YUN;KIM, KEUN YOUNG;REEL/FRAME:018408/0884Effective date: 20061010Owner name: LG-NORTEL CO., LTD.,KOREA, REPUBLIC OFFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KIM, DONG HUN;LEE, JUNG YUN;KIM, KEUN YOUNG;US-ASSIGNMENT DATABASE UPDATED:20100518;REEL/FRAME:18408/884RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services