Methods and devices for transmitting and receiving synchronous channels and broadcasting channels

1. A method for transmitting a synchronous channel by a base station in a communication system, comprising:

generating synchronous signals to be transmitted on a primary synchronous channel (P-SCH) and a secondary synchronous channel (S-SCH);

mapping the synchronous signals except for reference signals to first orthogonal frequency division multiplexing (OFDM) symbols to form the P-SCH and the S-SCH;

mapping the reference signals to second OFDM symbols different from the first OFDM symbols, the reference signals including a user-specific demodulation reference signal (DMRS), a channel state indication reference signal (CSI-RS) and a tracking reference signal (TRS); and

transmitting the mapped synchronous signals on the P-SCH and the S-SCH.

2. The method of claim 1 , wherein the method is applied in at least one of a frequency division duplex (FDD) communication system or time division duplex (TDD) communication system, and the P-SCH and the S-SCH have the same relative positions in the two communication systems.

3. The method of claim 2 , wherein, in the TDD communication system, the P-SCH and the S-SCH comprise any of the following bearing modes:

OFDM symbol 0 of downlink pilot time slot (DwPTS) bears the P-SCH;

OFDM symbol 1 of a second time slot in a previous sub-frame of the DwPTS bears the S-SCH; and

the OFDM symbol 0 and OFDM symbol 1 of the DwPTS respectively transmit the P-SCH and the S-SCH.

4. The method of claim 2 , wherein, in the FDD communication system, the P-SCH and the S-SCH comprise any of the following bearing modes:

OFDM symbol 1 of a second time slot of a sub-frame bears the P-SCH;

OFDM symbol 2 of a first time slot of the sub-frame bears the S-SCH; and

OFDM symbol 1 and the OFDM symbol 2 of the first time slot of the sub-frame respectively transmit the P-SCH and the S-SCH.

5. The method of claim 2 , wherein the first OFDM symbols are not:

the second OFDM symbols that can be used for bearing the CSI-RS for each of the FDD or the TDD communication system, or

the second OFDM symbols that can be used for bearing the CSI-RS in both of the FDD and the TDD communication systems.

6. A method for receiving a synchronous channel by a terminal in a communication system, comprising:

receiving signals;

demapping synchronous signals from first orthogonal frequency division multiplexing (OFDM) symbols to obtain the synchronous signals transmitted on a primary synchronous channel (P-SCH) and a secondary synchronous channel (S-SCH) except for reference signals;

demapping the reference signals from second OFDM symbols different from the first OFDM symbols, the reference signals including a user-specific demodulation reference signal (DMRS), a channel state indication reference signal (CSI-RS) and a tracking reference signal (TRS); and

carrying out system synchronization based on the demapped synchronous signals.

7. The method of claim 6 , wherein the method is applied to at least one of a frequency division duplex (FDD) communication system or time division duplex (TDD) communication system, and the P-SCH and the S-SCH have the same relative positions in the two communication systems.

8. The method of claim 7 , wherein, in the TDD communication system, demapping the first OFDM symbols to obtain the synchronous signals comprises at least one of:

obtaining a synchronous signal of the P-SCH from OFDM symbol 0 of downlink pilot time slot (DwPTS);

obtaining a synchronous signal of the S-SCH from OFDM symbol 1 of a second time slot in a previous sub-frame of the DwPTS; and

obtaining the synchronous signals of the P-SCH and the S-SCH, respectively, from previous two OFDM symbols of the DwPTS.

9. The method of claim 7 , wherein, in the FDD communication system, demapping the first OFDM symbols to obtain the synchronous signals comprises one of:

obtaining a synchronous signal of the P-SCH from OFDM symbol 1 of a second time slot of a sub-frame;

obtaining a synchronous signal of the S-SCH from OFDM symbol 2 of a first time slot of the sub-frame; and

obtaining the synchronous signals of the P-SCH and the S-SCH, respectively, from OFDM symbol 1 and the OFDM symbol 2 of the first time slot of the sub-frame.

10. A method for transmitting a broadcasting channel by a base station in a communication system, comprising:

generating a broadcasting signal to be transmitted on a primary broadcasting channel (P-BCH);

mapping the broadcasting signal except for a reference signal and synchronous signals to first orthogonal frequency division multiplexing (OFDM) symbols to form the P-BCH;

mapping the reference signal and the synchronous signals to second OFDM symbols different from the first OFDM symbols, the reference signal including a channel state indication reference signal (CSI-RS); and

transmitting the mapped broadcasting signal on the P-BCH.

11. The method of claim 10 , wherein the first OFDM symbols are not:

the second OFDM symbols that can be used for bearing the CSI-RS for each of a frequency division duplex (FDD) communication system or a time division duplex (TDD) communication system, or

the second OFDM symbols that can be used for bearing the CSI-RS in both of the FDD communication system and the TDD communication system.

12. The method of claim 10 , wherein, for each burst of the P-BCH, the number of resource elements (RE) for P-BCH transmission is determined by parameters of a current long term evolution (LTE) system.

13. The method of claim 12 , wherein the first OFDM symbols occupied by the P-BCH are determined by an OFDM symbol of a user-specific demodulation reference signal (DMRS).

14. The method of claim 12 , wherein the P-BCH is mapped to 4 OFDM symbols that transmit tracking reference signal (TRS).

15. The method of claim 10 , wherein the P-BCH is transmitted in any of the following modes:

for a normal cyclic prefix (CP) sub-frame, the P-BCH occupies OFDM symbols 0, 3, 4 of a first time slot and OFDM symbols 0, 1, 4 of a second time slot;

for an extended CP sub-frame structure, the P-BCH occupies OFDM symbols 0, 3 of the first time slot and OFDM symbols 0, 1, 2, 3 of the second time slot;

for an extended CP sub-frame structure, the P-BCH occupies OFDM symbols 0, 1, 2, 3 of the first time slot and OFDM symbols 0, 3 of the second time slot;

for a normal CP sub-frame, the P-BCH occupies OFDM symbols 0, 1, 3, 4 of the first time slot, and OFDM symbols 0, 4 of the second time slot; and

for an extended CP sub-frame structure, the P-BCH occupies OFDM symbols 0, 1, 3 of the first time slot and OFDM symbols 0, 2, 3 of the second time slot.

16. The method of claim 10 , wherein the P-BCH comprises one or more of the following features:

the number of occupied sub-carriers being smaller than a number of sub-carriers of 6 physical resource blocks (PRBs) and being equivalent to an integral number of PRBs;

occupying PRB resource in a middle of a frequency band; and

the PRB resource at both ends of a frequency resource of the 6 PRBs in the middle of the frequency band being used for transmitting the P-BCH.

17. A method for receiving a broadcasting channel by a terminal in a communication system, comprising:

receiving signals;

demapping a broadcasting signal except for a reference signal and synchronous signals from first orthogonal frequency division multiplexing (OFDM) symbols to obtain the broadcasting signal transmitted on a primary broadcasting channel (P-BCH);

demapping the reference signal and the synchronous signals from second OFDM symbols different from the first OFDM symbols, the reference signal including a channel state indication reference signal (CSI-RS); and

obtaining broadcasting information based on the demapped broadcasting signal.

18. The method of claim 17 , wherein the first OFDM symbols are not:

the second OFDM symbols that can be used for bearing the CSI-RS for each of frequency division duplex (FDD) communication system or a time division duplex (TDD) communication system, or

the second OFDM symbols that can be used for bearing the CSI-RS in both of the FDD communication system and the TDD communication system.

19. The method of claim 17 , wherein the P-BCH is transmitted in any of the following modes:

for a normal cyclic prefix (CP) sub-frame, the P-BCH occupies OFDM symbols 0, 3, 4 of a first time slot and OFDM symbols 0, 1, 4 of a second time slot;

for an extended CP sub-frame structure, the P-BCH occupies OFDM symbols 0, 3 of the first time slot and OFDM symbols 0, 1, 2, 3 of the second time slot;

for an extended CP sub-frame structure, the P-BCH occupies OFDM symbols 0, 1, 2, 3 of the first time slot and OFDM symbols 0, 3 of the second time slot;

for a normal CP sub-frame, the P-BCH occupies OFDM symbols 0, 1, 3, 4 of the first time slot and OFDM symbols 0, 4 of the second time slot; and

for an extended CP sub-frame structure, the P-BCH occupies OFDM symbols 0, 1, 3 of the first time slot and OFDM symbols 0, 2, 3 of the second time slot.

20. The method of claim 17 , wherein the P-BCH comprises one or more of the following features:

a number of occupied sub-carriers being smaller than a number of sub-carriers of six physical resource blocks (PRBs) and being equivalent to an integral number of PRBs;

occupying PRB resource in a middle of a frequency band; and

the PRB resource at both ends of a frequency resource of the 6 PRBs in the middle of the frequency band being used for transmitting the P-BCH.

21. A base station in a communication system, comprising:

a processor configured to:

generate synchronous signals to be transmitted on a primary synchronous channel (P-SCH) and a secondary synchronous channel (S-SCH);

map the synchronous signals except for reference signals to first orthogonal frequency division multiplexing (OFDM) symbols to form the P-SCH and the S-SCH, and

map the reference signals to second OFDM symbols different from the first OFDM symbols, the reference signals including a user-specific demodulation reference signal (DMRS), a channel state indication reference signal (CSI-RS) and a tracking reference signal (TRS); and

a transceiver configured to transmits the mapped synchronous signals on the P-SCH and the S-SCH.

22. The base station of claim 21 , wherein the base station is in a frequency division duplex (FDD) communication system or time division duplex (TDD) communication system, and the P-SCH and the S-SCH have the same relative positions in the two communication systems.

23. A terminal in a communication system, comprising:

a transceiver configured to receives signals; and

a processor configured to:

demap synchronous signals from first orthogonal frequency division multiplexing (OFDM) symbols to obtain the synchronous signals transmitted on a primary synchronous channel (P-SCH) and a secondary synchronous channel (S-SCH) except for reference signals,

demap the reference signals from second OFDM symbols different from the first OFDM symbols, the reference signals including a user-specific demodulation reference signal (DMRS), a channel state indication reference signal (CSI-RS) and a tracking reference signal (TRS), and

carry out system synchronization based on the demapped synchronous signals.

24. The terminal of claim 23 , wherein the terminal is in a frequency division duplex (FDD) communication system or a time division duplex (TDD) communication system, and the P-SCH and the S-SCH have the same relative positions in the two communication systems.

25. A base station in a communication system, comprising:

a processor configured to:

generate a broadcasting signal to be transmitted on a primary broadcasting channel (P-BCH),

map the broadcasting signal except for a reference signal and synchronous signals to first orthogonal frequency division multiplexing (OFDM) symbols to form the P-BCH, and

map the reference signal and the synchronous signals to second OFDM symbols different from the first OFDM symbols, the reference signal including a channel state indication reference signal (CSI-RS); and

a transceiver configured to transmit the mapped broadcasting signal on the P-BCH.

26. A terminal in a communication system, comprising:

a transceiver configured to receive signals; and

a processor configured to:

demap a broadcasting signal except for a reference signal and synchronous signals from first orthogonal frequency division multiplexing (OFDM) symbols to obtain the broadcasting signal transmitted on a primary broadcasting channel (P-BCH),

demap the reference signal and the synchronous signals from second OFDM symbols different from the first OFDM symbols, the reference signals including a channel state indication reference signal (CSI-RS) or synchronous signals, and

obtain broadcasting information based on the demapped broadcasting signal.