Base station apparatus, user apparatus, and method used in mobile communications system
First Claim
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1. A base station apparatus in a mobile communications system which uses orthogonal frequency division multiplexing (OFDM) for downlink, comprising:
- a unit which generates a first signal;
a unit which generates a second signal;
a unit which multiplexes the first signal and the second signal and maps the multiplexed signals to a sub-carrier to generate a transmit symbol;
a mapping determining unit which determines a position of mapping the second signal to the sub-carrier, wherein the mapping determining unit determines the mapping position based on a cell ID or cell group ID, and a mapping pattern defined with a sequence fhop(j) having a two-stage structure; and
wherein the mapping pattern defined with the sequence having the two-stage structure is defined by fhop(j)=a(x,j)+b(ID), wherein ID is the cell group ID or the cell ID, a(x,j) is a first-stage sequence including a random hopping pattern having arguments x and j, wherein x=floor(ID/6) and j is an integer from 0 to 9, and wherein b(ID)=ID % 6 is a second-stage sequence representing a fixed shift to the first-stage sequence a(x,j), andwherein the cell or cell group having the same hopping pattern is arranged in a neighboring manner in the first sequence.
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Abstract
A base station apparatus in a mobile communications system which uses orthogonal frequency division multiplexing (OFDM) for downlink is disclosed. The base station includes a unit which generates a first signal; a unit which generates a second signal; a unit which multiplexes the first signal and the second signal to map the multiplexed signals to a sub-carrier to generate a transmit symbol; and a mapping determining unit which determines a position of mapping the second signal to the sub-carrier, wherein the mapping determining unit determines the mapping position based on a cell ID or cell group ID, and a mapping pattern defined with a sequence having two-stage structure.
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Citations
7 Claims
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1. A base station apparatus in a mobile communications system which uses orthogonal frequency division multiplexing (OFDM) for downlink, comprising:
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a unit which generates a first signal; a unit which generates a second signal; a unit which multiplexes the first signal and the second signal and maps the multiplexed signals to a sub-carrier to generate a transmit symbol; a mapping determining unit which determines a position of mapping the second signal to the sub-carrier, wherein the mapping determining unit determines the mapping position based on a cell ID or cell group ID, and a mapping pattern defined with a sequence fhop(j) having a two-stage structure; and wherein the mapping pattern defined with the sequence having the two-stage structure is defined by fhop(j)=a(x,j)+b(ID), wherein ID is the cell group ID or the cell ID, a(x,j) is a first-stage sequence including a random hopping pattern having arguments x and j, wherein x=floor(ID/6) and j is an integer from 0 to 9, and wherein b(ID)=ID % 6 is a second-stage sequence representing a fixed shift to the first-stage sequence a(x,j), and wherein the cell or cell group having the same hopping pattern is arranged in a neighboring manner in the first sequence. - View Dependent Claims (2, 3)
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4. A user apparatus in a mobile communications system which uses orthogonal frequency division multiplexing (OFDM) for downlink, comprising:
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a unit which Fourier transforms a signal received from a base station apparatus, and derives a receive symbol; a separating unit which separates a first signal and a second signal from the receive symbol; a mapping information managing unit which determines information on mapping of the second signal on a sub-carrier, and supplies the mapping information to the separating unit; and a unit which makes channel estimation using the second signal, and demodulates the first signal, wherein the mapping information managing unit stores in advance a corresponding relationship between a cell ID or cell group ID and a mapping pattern defined with a sequence fhop(j) having a two-stage sequence defined by a first-stage sequence including a random hopping pattern and a second-stage sequence representing a shift having a fixed amount of shift, and the mapping information managing unit detects the mapping pattern based on the cell ID of a cell in which the user apparatus is located or the cell group ID of a cell group to which the cell belongs, and supplies the detected mapping pattern to the separating unit, the mapping pattern defined in the two-stage sequence is fhop(j)=a(x,j)+b(ID), wherein ID is the cell group ID or the cell ID, a(x,j) is a first-stage sequence including a random hopping pattern having arguments x and j, wherein x=floor ID/6) and j is an integer from 0 to 9, and wherein b(ID)=ID % 6 is a second-stage sequence representing a fixed shift to the first-stage sequence a(x,j), and the cell or cell group having the same hopping pattern is arranged in a neighboring manner in the first sequence. - View Dependent Claims (5, 6)
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7. A method of mapping to a sub-carrier of a signal in a mobile communications system which uses orthogonal frequency division multiplexing (OFDM) for downlink, comprising
the step of mapping, when a first signal and a second signal are multiplexed, the multiplexed signals to the sub-carrier to generate a transmit symbol in a base station apparatus, the second signal to a sub-carrier position which is determined by a cell ID or cell group ID, and a mapping pattern defined in a two-stage sequence including a first-stage sequence having a random hopping pattern and a second-stage sequence having a shift with a fixed shift amount, wherein the mapping pattern is fhop(j)=a(x,j)+b(ID), wherein ID is the cell group ID or the cell ID, a(x,j) is the first-stage sequence including a random hopping pattern having arguments x and j, wherein x=floor(ID/6) and j is an integer from 0 to 9, and wherein b(ID)=ID % 6 is the second-stage sequence representing a fixed shift to the first-stage sequence a(x,j), and wherein the cell or cell group having the same hopping pattern is arranged in a neighboring manner in the first sequence.
Specification
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Current AssigneeNTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
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Original AssigneeNTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
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InventorsIshii, Hiroyuki, Kishiyama, Yoshihisa, Higuchi, Kenichi, Sawahashi, Mamoru
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Primary Examiner(s)Banks Harold, Marsha D
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Assistant Examiner(s)Houshmand, Hooman
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Application NumberUS12/531,635Publication NumberTime in Patent Office1,912 DaysField of SearchNoneUS Class Current370/329CPC Class CodesH04L 27/2613 Structure of the reference ...H04L 27/26134 Pilot insertion in the tran...H04L 5/0007 the frequencies being ortho...H04L 5/0023 Time-frequency-spaceH04L 5/0044 allocation of payloadH04L 5/0048 Allocation of pilot signals...H04L 5/005 of common pilots, i.e. pilo...
