[특허]Apparatus and method for allocating channel using OVSF code for uplink synchronous transmission scheme in a W-CDMA communication system

Samsung Electronics Co., Ltd.

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Apparatus and method for allocating channel using OVSF code for uplink synchronous transmission scheme in a W-CDMA communication system

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04E-007/216
미국특허분류(USC)	370/342; 375/141
출원번호	US-0764804 (2001-01-17)
우선권정보	KR-0002076 (2000-01-17); KR-0002161 (2000-01-18); KR-0002503 (2000-01-19); KR-0035173 (2000-06-24); KR-0037827 (2000-06-29); KR-0038095 (2000-06-30)
발명자 / 주소	Choi, Sung-Ho Park, Chang-Soo Kim, Jae-Yoel Park, Seong-III Jung, Ki-Ho Choi, Ho-Kyu Lee, Hyun-Woo Kwak, Yong-Jun Lee, Kook-Heui
출원인 / 주소	Samsung Electronics Co., Ltd.
대리인 / 주소	Dilworth &
인용정보	피인용 횟수 : 32 인용 특허 : 4

초록
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Disclosed is a channel allocation method in a CDMA communication system. The method comprises receiving from a UTRAN one SF node CSF,k out of 2m?1 SF nodes (where m is an integer larger than 3) arranged in the form of a tree having a mother node and child nodes; searching a group including the received SF node CSF,k in accordance with Formula (1) below; spreading a signal on a dedicated physical data channel (DPDCH) with an OVSF code corresponding to a selected one of the received SF node and its child nodes in the searched group; and spreading a signal on a dedicated physical control channel (DPCCH) with an OVSF code corresponding to an SF node determined by Formula (2) below based on the received SF node. For???SF≤2m-14,(P1·SF,P1·k)=(2m-14,n)??For???SF>2m-14,(P2·2m-14,P2·n)=(SF,k)??where,P1=2m-14·SF???and???P2=4·SF2m-1.Formula (1)F?(C2m-14·k)=C2m-1?2m-1-k-1???(k=0,1,…??)??F?(C2m-14·k)=C2m-1,2m-1-(k-32)???(k=0,1,…??).Formula??(2)

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1. A channel allocation method in a CDMA (Code Division Multiple Access) communication system, comprising the steps of:receiving from a UTRAN (UMTS (Universal Mobile Terrestrial System) Terrestrial Radio Access Network) one SF (Spreading Factor) node CSF,k out of 2m?1 SF nodes (where m is an integer larger than 3) arranged in the form of a tree having a mother node and child nodes; searching a group including the received SF node CSF,k in accordance with spreading a signal on a dedicated physical data channel (DPDCH) with an OVSF (Orthogonal Variable Spreading Factor) code corresponding to a selected one of the received SF node and its child nodes in the searched group; and spreading a signal on a dedicated physical control channel (DPCCH) with an OVSF code corresponding to an SF node determined by if the n of the received SF node is the first half value having (2m?1)/4 and if the n thereof is the latter half value halving the same.2. The channel allocation method as claimed in claim 1, wherein if a spreading factor in the SF node CSF,k is SF=64 and an associated spreading factor for a control part is SF=256, a spreading factor Ccontrol,256,127?of the DPCCH is mapped to a spreading factor Cdata,64,k of the DPDCH, and a spreading factor Ccontrol,256,255?k of the DPCCH is mapped to a spreading factor Cdata,64,32+k of the DPDCH in accordance with:F(Cdata,64,k)=Ccontrol,256,127?k F(Cdata,64,32+k)=Ccontrol,256,255?k where k=0, 1, 2, 3, . . . , 23.3. The channel allocation method as claimed in claim 1, wherein if a spreading factor in the SF node CSF,k is SF=64 and an associated spreading factor for a control part is SF=256, a spreading factor Ccontrol,256,96+k of the DPCCH is mapped to a spreading factor Cdata,64,k of the DPDCH, and a spreading factor Ccontrol,256,224+k of the DPCCH is mapped to a spreading factor Cdata,64,32+k of the DPDCH in accordance with:?F(Cdata,64,k)=Ccontrol,256,96+k F(Cdata,64,32 +k)=Ccontrol,256,224+k where k=0, 1, 2, 3 , . . . , 23.4. The channel allocation method as claimed in claim 1, wherein in the case where a spreading factor in the SF node CSF,k is SF=1 28 and an associated spreading factor for a control part is SF=256, when k in a spreading factor Cdata,128,k of the DPDCH is an even number, a spreading factor of the DPCCH is mapped according to F(Cdata,128,k)=Ccontrol,256,127?k; when the k is an odd number, the spreading factor of theDPCCH is mapped according to F7(Cdata,128,2n+1)=F7(Cdata,128,2(n+8)+1)=F7(Cdata,128,2(n+16)+1)=Ccontrol,256,103?n, (for 0?n?7); when k in a spreading factor Cdata,64,32+k of the DPDCH is an even number, the spreading factor of the DPCCH is mapped according to F(Cdata,128,64+k)=Ccontrol,256,255?k; and when the k is an odd number, the spreading factor of the DPCCH is mapped according toF7(Cdata,128,64,+2n+1)=F7(Cdata,128,64+2(n+8)+1)=F7(Cdata,128,64+2(n+16)+1)=Ccontrol,256,207?n, (for 0?n?7), where k=0, 1, 2, 3, . . . , 23. 5. An uplink channel transmission apparatus for a user equipment (UE) in a CDMA communication system, comprising:a memory for storing 2m?1 SF nodes (where m is an integer larger than 3) arranged in the form of a tree having a mother node and child nodes; an input unit for receiving one SF node CSF,k from a UTRAN; an OVSF code allocating device for searching a group including the received SF node CSF,k according to selecting one node for a data part out of the receivedSF node and associated child nodes from the searched group, and selecting an SF node for a control part determined by if the n of the received SF node is the first half value halving (2m?1)/4 and if the n thereof is the latter half value halving the same;an OVSF code generator for generating OVSF codes for a DPDHC and a DPCCH corresponding to the selected SF nodes of the data part and the control part; a DPDCH spreader for spreading a signal on the DPDCH with the generated OVSF code for the data part; and a DPCCH spreader for spreading a signal on the DPCCH with the generated OVSF code for the control part. 6. The uplink channel transmission apparatus as claimed in claim 5, wherein if a spreading factor in the SF node CSF,k is SF=64 and an associated spreading factor for the control part is SF=256, a spreading factor Ccontrol,256,255?k of the DPCCH is mapped to a spreading factor Cdata,64,k of the DPDCH, and a spreading factor Ccontrol,256,255?k of the DPCCH is mapped to a spreading factor Cdata,64,32+k of the DPDCH in accordance with:F(Cdata,64,k)=Ccontrol,256,127?k F(Cdata,64,32+k)=Ccontrol,256,255?k where k=0, 1, 2, 3, . . . , 23.7. The uplink channel transmission apparatus as claimed in claim 5, wherein in the case where a spreading factor in the SF node CSF,k is SF=128 and an associated spreading factor for the control part is SF=256, when k in a spr ading factor Cdata,128,k of the DPDCH is an even number, a spreading factor of the DPCCH is apped according to F(Cdata,128,k)=Ccontrol,256,127?k; when k is an odd number, the spreading factor of the DPCCH is mapped according to F7(Cdata,128,2n+1)=F7(Cdata,128,2(n+8)+1)=F7(Cdata,128,2(n+16)+1)=Ccontrol,256,103?n, (for 0?n?7); when k in the spreading factor Cdata,64,32+k of the DPDCH is an even number, the spreading factor of the DPCCH is mapped according to F(Cdata,128,64+k)=Ccontrol,256,255?k; and when k is an odd number, the spreading factor of the DPCCH is mapped according toF7(Cdata,128,64+2n+1)=F7(Cdata,128,64+2(n+8)+1)=F7(Cdata,128,64+2(n+16)+1)=Ccontrol,256,207?n, (for 0?n?7), where k=0, 1, 2, 3,. . . , 23. 8. An uplink channel transmission apparatus for a UTRAN in a CDMA communication system, comprising:a memory for storing 2m?1 SF nodes (where m is an integer larger than 3) arranged in the form of a tree having a mother node and child nodes; an input unit for receiving one SF node CSF,k from a UE; an OVSF code allocating device for searching a group including the received SF node CSF,k according to selecting one node for a data part out of the received SF node and associated child nodes from the searched group, and selecting an SF node for a control part determined by if the n of the received SF node is the first half value halving (2m?1)/4 and if the n thereof is the latter half value halving the same;an OVSF code generator for generating OVSF codes for a DPDCH and a DPCCH corresponding to the selected SF nodes of the data part and the control part; a DPDCH despreader for despreading a signal on the DPDCH with the generated OVSF code for the data part; and a DPCCH despreader for despreading a signal on the DPCCH with the generated OVSF code for the control part. 9. A method for assigning a first OVSF code and a second OVSF code which respectively spread data signals and control signals, in a mobile communication system having an OVSF code wherein 2m?1 SF nodes are arranged in the form of a tree in m+1 column and the SF nodes are divided into a pair of trees having first and second half SF nodes obtained by halving first SF nodes in a column corresponding to a maximum SF, the method comprising the steps of:each tree allocating an OVSF code corresponding to one of some SF nodes in anm+1 column which becomes child nodes of one node out of second SF nodes following the first SF nodes as the first OVSF code for spreading a control signal; and allocating the second OVSF code corresponding to one of the remaining nodes which maintain orthogonality with said one of the second SF nodes to spread a data signal; wherein the maximum SF node is C4,k (where k=0, 1, 2, 3), the first SF nodes include C4,0 and C4,2, the second SF nodes incJude C4,1 and C4,3, the second SF node C4,1 includes child nodes C8,2 and C8,3, the second SF node C4,3 includes child nodes C8,6 and C8,7, the child nodes C8,3 and C8,7 are allocated as the second OVSF code for spreading the control signal, and the remaining nodes are allocated as the first OVSF code for spreading the data signal; and wherein the first OVSF codes for spreading the data signal and the second OVSF codes for spreading the control signal are so allocated as to be mapped according to: F(Cdata,64,k)=Ccontrol,256,127?k F(Cdata,64,32+k)=Ccontrol,256,255?k, where a spreading factor of the data signal is SF=64, a spreading factor of the control signal is SF=256, and k=0, 1, 2, 3, . . . , 23. 10. A method for assigning a first OVSF (Orthogonal Variable Spreading Factor) code and a second OVSF code which respectively spread data signals and control signals, in a mobile communication system having an OVSF code wherein 2m?1 SF (Spreading Factor) nodes are arranged in the form of a tree in m+1 column and the SF nodes are divided into a pair of trees having first and second half SF nodes obtained by halving first SF nodes in a column corresponding to a maximum SF, the method comprising the steps of:each tree allocating an OVSF code corresponding to one of some SF nodes in an m+1th column which becomes child nodes of one node out of second SF nodes following the first SF nodes as the first OVSF code for spreading a control signal; and allocating the second OVSF code corresponding to one of the remaining nodes which maintain orthogonality with said one of the second SF nodes to spread a data signal; wherein the maximum SF node is C4,k (where k=0, 1, 2, 3), the first SF nodes include C4,0 and C4,2, the second SF nodes include C4,i, and C4,3, the second SF node C4,1 includes child nodes C8,2 and C8,3, the second SF node C4,3 includes child nodes C8,6 and C8,7, the child nodes C8,3 and C8,7, are allocated as the second OVSF code for spreading the control signal, and the remaining nodes are allocated as the first OVSF code for spreading the data signal; and wherein when k is an even number, the first OVSF codes for spreading the data signal and the second OVSF codes for spreading the control signal are mapped according to F(Cdata,128,k)=Ccontrol,256,127?k and F(Cdata,128,64+k)=Ccontrol,256,255?k,and when k is an odd number, the first OVSF codes and the second OVSF codes are mapped according to F7(Cdata,128,2n+1)=F7(Cdata,128,2(n+8)+1)=F7(Cdata,128,2(n+16)+1)=Ccontrol,256,103?n, (for 0?n?7) and F7(Cdata,128,64+2n+1)=F7(Cdata,128,64+2(n+8)+1)=F7(Cdata,128,64+2(n+16)+1)=Ccontrol,256,207?n, (for 0?n?7), where a spreading factor of the data signal is SF=128, a spreading factor of the control signal is SF=256, and k=0, 1, 2, 3, . . . , 23. 11. A channel allocation method in a CDMA (Code Division Multiple Access) communication system, comprising the steps of:selecting a node among a plurality of nodes having a SF (Spreading Factor) supportable for a maximum data rate in the CDMA communication system; allocating codes corresponding to child nodes having the selected node as a mother node to a control channel; and allocating codes corresponding to non-selected nodes and codes corresponding to child nodes having the non-selected nodes as a mother node to a data channel corresponding to the control channel, wherein the codes allocated to a plurality of control channels maintain orthogonality with each other, and the codes allocated to a plurality of data channels are also orthogonal with each other. 12. A channel transmission method for a user equipment (UB) in a CDMA (Code Division Multiple Access) communication system, comprising the steps of:receiving a node having a specific SF (Spreading Factor) allocated from a UTRAN (UMTS (Universal Mobile Terrestrial System) Terrestrial Radio Access Network); selecting a node among at least one node having an identical SF as the received node; allocating a child node among a plurality of child nodes having the selected node as a mother node to a control channel; allocating a node among the received node and child nodes having the received node as a mother node to a data channel corresponding to the control channel; spreading a control signal with a code corresponding to the node allocated to the control channel; and spreading a data signal with a code corresponding to the node allocated to the data channel, wherein a code corresponding to the selected node maintains orthogonality with a code corresponding to the received node. 13. A channel transmission apparatus for a user equipment (UE) in a CDMA (Code Division Multiple Access) communication system, comprising:an input unit for receiving a node having a specific SF (Spreacting Factor) allocated from a UTRAN (UMTS (Universal Mobile Terrestrial System) Terrestrial Radio Access Network); an OVSF (Orthogonal Variable Spreading Factor) code allocating device for selecting a node among one or more nodes having the same SF to the received node, allocating a code corresponding to anode among child nodes having the selected node as a mother node to a control channel, and allocating a code corresponding to a node among the received node and child nodes having the received node as a mother node to a data channel corresponding to the control channel; an OVSF code generator for generating the code allocated to the control channel and the code allocated to the data channel; a first spreader for spreading a control signal with the generated code for the control channel; and a second spreader for spreading a data signal with the generated code for the data channel, wherein a code corresponding to the selected node maintains orthogonality with a code corresponding to the received node. 14. A channel reception apparatus for a UTRAN(UMTS (Universal Mobile Terrestrial System) Terrestrial Radio Access Network) in a CDMA (Code Division Multiple Access) communication system, comprising:a memory for storing nodes arranged in a tree form for each SF (Spreading Factor); an OVSF (Orthogonal Variable Spreading Factor) code allocating device for acquiring a node among at least one node having an identical SF to a random node allocated to a specific UE, allocating a node among child nodes having the acquired node as a mother node to a control channel, and allocating a node among a random node and child nodes having the random node as a mother node to the data channel corresponding to the control channel; an OVSF code generator for generating a first code corresponding to the node allocated to the control channel and a second code corresponding to the node allocated to the data channel; a first despreader for despreading a control signal received from the specific UE with the first code; and a second despreader for despreading a data signal received from the specific UE with the second code, wherein a code corresponding to the acquired node maintains orthogonality with a code corresponding to the reccived node.

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Apparatus and method for allocating channel using OVSF code for uplink synchronous transmission scheme in a W-CDMA communication system

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