Apparatus and method for generating synchronization channel in a wireless communication system
A Synchronization Channel (SCH) transmission method includes generating a Primary SCH (P-SCH) sequence according to supplementary information. The supplementary information includes at least one of Base Station (BS) type information, Fast Fourier Transform (FFT) size information, BandWidth (BW) information, group information, sector information, and carrier type information. The method also includes modulating the P-SCH sequence and mapping the modulated P-SCH sequence to subcarriers within a predefined subcarrier set. The subcarriers are included in the subcarrier set being spaced one subcarrier interval apart. The method further includes generating a P-SCH symbol by Orthogonal Frequency Division Multiplexing (OFDM)-modulating the P-SCH sequence mapped to the subcarriers, and transmitting the P-SCH symbol.
1. An apparatus for use in a base station in a wireless communication system, the apparatus comprising:
a modulator configured to modulate a preamble sequence that is determined based on a carrier configuration and a bandwidth;
a subcarrier mapper configured to map the modulated preamble sequence to subcarriers within a predefined subcarrier set that is determined by a predefined rule; and
a transmitter configured to transmit the preamble sequence,
wherein the carrier configuration is one of a configuration for a fully configured carrier and a configuration for a partially configured carrier,
wherein control channels including synchronization, broadcast, multicast and unicast control signaling are configured for the fully configured carrier, and
wherein a downlink only carrier with control channels to support downlink transmission is configured for the partially configured carrier.
2. The apparatus of claim 1 , wherein a length of the preamble sequence is equal to ‘216’.
3. The apparatus of claim 2 , wherein the subcarriers in the predefined subcarrier set are spaced one subcarrier interval apart.
4. The apparatus of claim 1 , wherein the subcarrier set (PSCHCarrierSet) is configured according to the equation:
PSCHCarrierSet=2· k+ 41,
where PSCHCarrierSet corresponds to indexes of subcarriers allocated for the preamble and k corresponds to an integer between 0 and 215 inclusive, and
wherein an index value=256 corresponds to a Direct Current (DC) subcarrier.
5. The apparatus of claim 1 , wherein candidates for the preamble sequence are determined according to a first table, the first table comprising:
Index
Sequence (hexadecimal)
0
6DB4F3B16BCE59166C9CEF7C3C8CA5EDFC16A9D1DC01F2AE6AA08F
1
1799628F3B9F8F3B22C1BA19EAF94FEC4D37DEE97E027750D298AC
2
92161C7C19BB2FC0ADE5CEF3543AC1B6CE6BE1C8DCABDDD319EAF7
3
6DE116E665C395ADC70A89716908620868A60340BF35ED547F8281
4
BCFDF60DFAD6B027E4C39DB20D783C9F467155179CBA31115E2D04
5
7EF1379553F9641EE6ECDBF5F144287E329606C616292A3C77F928
6
8A9CA262B8B3D37E3158A3B17BFA4C9FCFF4D396D2A93DE65A0E7C
7
DA8CE648727E4282780384AB53CEEBD1CBF79E0C5DA7BA85DD3749
8
3A65D1E6042E8B8AADC701E210B5B4B650B6AB31F7A918893FB04A
9
D46CF86FE51B56B2CAA84F26F6F204428C1BD23F3D888737A0851C
10
640267A0C0DF11E475066F1610954B5AE55E189EA7E72EFD57240F.
6. The apparatus of claim 5 , wherein a corresponding relationship between a combination of bandwidth (BW) and carrier type and the candidates for the preamble sequence is as indicated in a second table, the second table comprising:
Index
Carrier
BW
Sequence
0
Fully
5 MHz
6DB4F3B16BCE59166C9CEF7C3C8CA5EDFC16A9D1DC01F2AE6AA08F
1
configured
7, 8.75 &
1799628F3B9F8F3B22C1BA19EAF94FEC4D37DEE97E027750D298AC
10 MHz
2
20 MHz
92161C7C19BB2FC0ADE5CEF3543AC1B6CE6BE1C8DCABDDD319EAF7
3
—
6DE116E665C395ADC70A89716908620868A60340BF35ED547F8281
4
—
BCFDF60DFAD6B027E4C39DB20D783C9F467155179CBA31115E2D04
5
—
7EF1379553F9641EE6ECDBF5F144287E329606C616292A3C77F928
6
—
8A9CA262B8B3D37E3158A3B17BFA4C9FCFF4D396D2A93DE65A0E7C
7
—
DA8CE648727E4282780384AB53CEEBD1CBF79E0C5DA7BA85DD3749
8
—
3A65D1E6042E8B8AADC701E210B5B4B650B6AB31F7A918893FB04A
9
—
D46CF86FE51B56B2CAA84F26F6F204428C1BD23F3D888737A0851C
10
Partially
N/A
640267A0C0DF11E475066F1610954B5AE55E189EA7E72EFD57240F.
configured
7. The apparatus of claim 6 , further comprising:
an Orthogonal Frequency Division Multiplexing (OFDM) modulator configured to generate a preamble symbol by OFDM-modulating the preamble sequence mapped to the subcarriers,
wherein the preamble symbol has a pattern where a same signal is repeated twice.
8. The apparatus of claim 1 , wherein the predefined subcarrier set consists of subcarriers having odd-numbered indexes between ‘41’ and ‘471’ inclusive.
9. A method for transmitting a preamble in a wireless communication system, the method comprising:
modulating a preamble sequence that is determined based on a carrier configuration and a bandwidth;
mapping the modulated preamble sequence to subcarriers in a predefined subcarrier set that is determined by a predefined rule; and
transmitting the preamble symbol,
wherein the carrier configuration is one of a configuration for a fully configured carrier and a configuration for a partially configured carrier,
wherein control channels including synchronization, broadcast, multicast and unicast control signaling are configured for the fully configured carrier, and
wherein a downlink only carrier configured with control channels to support downlink transmission is configured for the partially configured carrier.
10. The method of claim 9 , wherein a length of the preamble sequence is equal to ‘216’.
11. The method of claim 10 , wherein the subcarriers in the predefined subcarrier set are spaced one subcarrier interval apart.
12. The method of claim 9 , wherein the subcarrier set (PSCHCarrierSet) is configured according to the equation:
PSCHCarrierSet=2· k+ 41,
where PSCHCarrierSet corresponds to indexes of subcarriers allocated for the preamble and k corresponds to an integer between 0 and 215 inclusive, and
wherein an index value=256 corresponds to a Direct Current (DC) subcarrier.
13. The method of claim 9 , wherein candidates for the preamble sequence are determined according to a first table, the first table comprising:
Index
Sequence (hexadecimal)
0
6DB4F3B16BCE59166C9CEF7C3C8CA5EDFC16A9D1DC01F2AE6AA08F
1
1799628F3B9F8F3B22C1BA19EAF94FEC4D37DEE97E027750D298AC
2
92161C7C19BB2FC0ADE5CEF3543AC1B6CE6BE1C8DCABDDD319EAF7
3
6DE116E665C395ADC70A89716908620868A60340BF35ED547F8281
4
BCFDF60DFAD6B027E4C39DB20D783C9F467155179CBA31115E2D04
5
7EF1379553F9641EE6ECDBF5F144287E329606C616292A3C77F928
6
8A9CA262B8B3D37E3158A3B17BFA4C9FCFF4D396D2A93DE65A0E7C
7
DA8CE648727E4282780384AB53CEEBD1CBF79E0C5DA7BA85DD3749
8
3A65D1E6042E8B8AADC701E210B5B4B650B6AB31F7A918893FB04A
9
D46CF86FE51B56B2CAA84F26F6F204428C1BD23F3D888737A0851C
10
640267A0C0DF11E475066F1610954B5AE55E189EA7E72EFD57240F.
14. The method of claim 13 , wherein a corresponding relationship between the combination of the BW and the carrier type and the candidates for the preamble sequence is as indicated in a second table, the second table comprising:
Index
Carrier
BW
Sequence
0
Fully
5 MHz
6DB4F3B16BCE59166C9CEF7C3C8CA5EDFC16A9D1DC01F2AE6AA08F
1
configured
7, 8.75 &
1799628F3B9F8F3B22C1BA19EAF94FEC4D37DEE97E027750D298AC
10 MHz
2
20 MHz
92161C7C19BB2FC0ADE5CEF3543AC1B6CE6BE1C8DCABDDD319EAF7
3
—
6DE116E665C395ADC70A89716908620868A60340BF35ED547F8281
4
—
BCFDF60DFAD6B027E4C39DB20D783C9F467155179CBA31115E2D04
5
—
7EF1379553F9641EE6ECDBF5F144287E329606C616292A3C77F928
6
—
8A9CA262B8B3D37E3158A3B17BFA4C9FCFF4D396D2A93DE65A0E7C
7
—
DA8CE648727E4282780384AB53CEEBD1CBF79E0C5DA7BA85DD3749
8
—
3A65D1E6042E8B8AADC701E210B5B4B650B6AB31F7A918893FB04A
9
—
D46CF86FE51B56B2CAA84F26F6F204428C1BD23F3D888737A0851C
10
Partially
N/A
640267A0C0DF11E475066F1610954B5AE55E189EA7E72EFD57240F.
configured
15. The method of claim 14 , further comprising:
generating a preamble symbol by OFDM-modulating the preamble sequence mapped to the subcarriers,
wherein the preamble symbol has a pattern where a same signal is repeated twice.
16. The base station of claim 15 , wherein the subcarrier set (PSCHCarrierSet) is configured according to the equation:
PSCHCarrierSet=2· k+ 41,
where PSCHCarrierSet corresponds to indexes of subcarriers allocated for the preamble and k corresponds to an integer between 0 and 215 inclusive, and
wherein an index value=256 corresponds to a Direct Current (DC) subcarrier.
17. The method of claim 9 , wherein the predefined subcarrier set consists of subcarriers having odd-numbered indexes between ‘41’ and ‘471’ inclusive.
18. A base station in a wireless communication system, the base station comprising:
a modulator configured to modulate a preamble sequence that is determined based on a carrier configuration and a bandwidth;
a subcarrier mapper configured to map the modulated preamble sequence to subcarriers in a predefined subcarrier set, the predefined subcarrier set consisting of subcarriers having odd-numbered indexes between ‘41’ and ‘471’ inclusive; and
a transmitter coupled to at least one antenna, the transmitter configured to transmit the preamble sequence using the at least one antenna, wherein the carrier configuration is one of a configuration for a fully configured carrier and a configuration for a partially configured carrier,
wherein control channels including synchronization, broadcast, multicast and unicast control signaling are configured for the fully configured carrier, and
wherein a downlink only carrier with control channels to support downlink transmission is configured for the partially configured carrier.
19. The base station of claim 18 , wherein a length of the preamble sequence is equal to ‘216’.
20. The base station of claim 19 , wherein the subcarriers in the predefined subcarrier set are spaced one subcarrier interval apart.
21. An apparatus for use in a mobile station in a wireless communication system, the apparatus comprising:
a receiver configured to receive, from a base station, a preamble sequence that is determined based on a carrier configuration and a bandwidth; and
a demodulator configured to demodulate the preamble sequence,
wherein the carrier configuration is one of a configuration for a fully configured carrier and a configuration for a partially configured carrier,
wherein control channels including synchronization, broadcast, multicast and unicast control signaling are configured for the fully configured carrier, and
wherein a downlink only carrier with control channels to support downlink transmission is configured for the partially configured carrier.
22. A method for operating a mobile station in a wireless communication system, the method comprising:
receiving, from a base station, a preamble sequence that is determined based on a carrier configuration and a bandwidth; and
demodulating the preamble sequence,
wherein the carrier configuration is one of a configuration for a fully configured carrier and a configuration for a partially configured carrier,
wherein control channels including synchronization, broadcast, multicast and unicast control signaling are configured for the fully configured carrier, and
wherein a downlink only carrier with control channels to support downlink transmission is configured for the partially configured carrier.