A cellular system using a code division multiple access (CDMA) scheme includes N (N is a positive integer) pilot channels and M (M is a positive integer) data channels. The pilot channels are used transmitting reference signals whose transmission signals are known in advance. The data channels are u
A cellular system using a code division multiple access (CDMA) scheme includes N (N is a positive integer) pilot channels and M (M is a positive integer) data channels. The pilot channels are used transmitting reference signals whose transmission signals are known in advance. The data channels are used for transmitting information. Each of the M data channels is made to correspond to one or a plurality of said N pilot channels.
대표청구항▼
What is claimed is: 1. A base station in a cellular system, the cellular system including at least one mobile terminal, said base station comprising: a transmitter which transmits first and second pilot channels and transmits first and second data channels, the second data channel being a high bit
What is claimed is: 1. A base station in a cellular system, the cellular system including at least one mobile terminal, said base station comprising: a transmitter which transmits first and second pilot channels and transmits first and second data channels, the second data channel being a high bit rate channel which has a higher bit rate than that of the first data channel, the first and the second pilot channels being made to correspond to the first and the second data channels, respectively; and a controller which notifies the mobile terminal that the second pilot channel is made to correspond to the second data channel, the mobile terminal being allowed to communicate by making use of the second data channel. 2. The base station according to claim 1, wherein said transmitter transmits a third data channel, and the first pilot channel is made to correspond to the third data channel and is shared by the first and the third data channels. 3. The base station according to claim 2, wherein the second pilot channel is exclusively assigned to the second data channel. 4. The base station according to claim 1, wherein the second pilot channel has a narrow directivity which is narrower than that of the first pilot channel. 5. The base station according to claim 1, further comprising an antenna which has plural types of directivities, wherein a directivity of each of the first and the second pilot channels is set by choosing one type of directivity from the plural types of directivities. 6. The base station according to claim 1, wherein said transmitter transmits a control channel toward plural mobile terminals, and said controller notifies, via the control channel, a specific mobile terminal of the plural mobile terminals that the second pilot channel is made to correspond to the second data channel. 7. A base station in a cellular system, the cellular system including at least one mobile terminal, said base station comprising: a transmitter which transmits plural pilot channels and transmits a data channel to said mobile terminal, the data channel being made to correspond to a specific pilot channel among said plural pilot channels in the event that the mobile terminal moves at a high speed; and a controller which notifies the mobile terminal that the data channel is made to correspond to the specific pilot channel in the event that the mobile terminal moves at a high speed. 8. The base station according to claim 7, wherein the specific pilot channel has a wider directivity than that of each of other pilot channels. 9. The base station according to claim 7, wherein the specific pilot channel has a directivity which covers all directions. 10. A base station in a cellular system, the cellular system including at least one mobile terminal, said base station comprising: a transmitter which transmits plural pilot channels and transmits a data channel to the mobile terminal, the data channel being made to correspond to a specific pilot channel among the plural pilot channels in the event that a position of the mobile terminal is unknown by the cellular system; and a controller which notifies the mobile terminal that the data channel being made to correspond to the specific pilot channel in the event that a position of the mobile terminal is unknown by the cellular system. 11. A base station in a cellular system, the cellular system including plural mobile terminals, said base station comprising: a transmitter which transmits plural pilot channels and transmits plural data channels to the plural mobile terminals, the plural pilot channels and the plural data channels being transmitted via an antenna, which has plural types of directivities, one of the plural types of directivities being used for each of the plural data channels, and the correspondence between the plural pilot channels and the plural data channels being determined on the basis of a directivity used for each of the plural data channels; and a controller which notifies the plural mobile terminals of the correspondence between the plural pilot channels and the plural data channels. 12. The base station according to claim 11, wherein the directivity used for each of the plural data channels is set in accordance with a position of each of the plural mobile terminals which receive the plural data channels, respectively. 13. A base station in a cellular system, the cellular system including at least one mobile terminal, said base station comprising: a transmitting means for transmitting first and second pilot channels and transmitting first and second data channels, the second data channel being a high rate channel which has a higher bit rate than that of the first data channel, the first and the second pilot channels being made to correspond to the first and the second data channels, respectively; and a controlling means for notifying the mobile terminal that the second pilot channel is made to correspond to the second data channel, the mobile terminal being allowed to communicate by making use of the second data channel. 14. A base station in a cellular system, the cellular system including at least one mobile terminal, said base station comprising: a transmitting means for transmitting plural pilot channels and transmitting a data channel to the mobile terminal, the data channel being made to correspond to a specific pilot channel among the plural pilot channels in the event that the mobile terminal moves at a high speed; and a controlling means for notifying the mobile terminal that the data channel being made to correspond to the specific pilot channel in the event that the mobile terminal moves at a high speed. 15. A base station in a cellular system, the cellular system including at least one mobile terminal, said base station comprising: a transmitting means for transmitting plural pilot channels and transmitting a data channel to the mobile terminal, the data channel being made to correspond to a specific pilot channel among the plural pilot channels in the event that a position of the mobile terminal is unknown by the cellular system; and a controlling means for notifying the mobile terminal that the data channel being made to correspond to the specific pilot channel in the event that a position of the mobile terminal is unknown by the cellular system. 16. A base station in a cellular system, the cellular system including plural mobile terminals, said base station comprising: a transmitter means for transmitting plural pilot channels and transmitting plural data channels to the plural mobile terminals, the plural pilot channels and the plural data channels being transmitted via an antenna, which has plural types of directivities, one of the plural types of directivities being used for each of the plural data channels, and the correspondence between the plural pilot channels and the plural data channels being determined on the basis of a directivity used for each of the plural data channels; and a controlling means for notifying the plural mobile terminals of the correspondence between the plural pilot channels and the plural data channels. 17. A cellular system, comprising: a base station; and at least one mobile terminal, wherein said base station transmits first and second pilot channels and transmits first and second data channels, the second data channel being a high rate channel which has a higher bit rate than that of the first data channel, the first and the second pilot channels being made to correspond to the first and the second data channels, respectively, and said base station notifies the mobile terminal that the second pilot channel is made to correspond to the second data channel, and wherein said mobile terminal is allowed to communicate by making use of the second data channel and receives the notification from said base station. 18. A cellular system, comprising: a base station; and plural mobile terminals, wherein said base station transmits plural pilot channels and transmits plural data channels to the plural mobile terminals, the plural pilot channels and the plural data channels being transmitted via an antenna, which has plural types of directivities, one of the plural types of directivities being used for each of the plural data channels, and the correspondence between the plural pilot channels and the plural data channels being determined on the basis of a directivity used for each of the plural data channels, and said base station notifies the mobile terminal that the second pilot channel is made to correspond to the second data channel, and wherein said mobile terminal is allowed to communicate by making use of one of the plural data channels and receives the notification from said base station. 19. A controlling method for use in a cellular system, the cellular system including a mobile terminal, said controlling method comprising: transmitting first and second pilot channels; transmitting first and second data channels, the second data channel being a high rate channel which has a higher hit rate than that of the first data channel, the first and the second pilot channels being made to correspond to the first and the second data channels, respectively; and notifying the mobile terminal that the second pilot channel is made to correspond to the second data channel, the mobile terminal is allowed to communicate by making use of the second data channel. 20. A controlling method for use in a cellular system, the cellular system including plural mobile terminals, said controlling method comprising: transmitting plural pilot channels; transmitting plural data channels to said plural mobile terminals, the plural pilot channels and the plural data channels being transmitted via an antenna, which has plural types of directivities; using one of the plural types of directivities used for each of the plural data channels; determining the correspondence between the plural pilot channels and the plural data channels on the basis of a directivity used for each of the plural data channels, and notifying the plural mobile terminals of the correspondence between the plural pilot and the plural data channels.
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이 특허에 인용된 특허 (9)
Tangemann Michael,DEX ; Hoek Cornelis,DEX ; Schlesinger Heinz,DEX, Assignment of a carrier frequency in an SDMA radio system.
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