METHODS AND DEVICES FOR TRANSMITTING AND RECEIVING SYNCHRONOUS CHANNELS AND BROADCASTING CHANNELS

• US 20140086111A1
• Filed: 09/26/2013
• Published: 03/27/2014
• Est. Priority Date: 09/26/2012
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: LI, Yingyang, SUN, Chengjun
• Granted Patent: US 9,736,836 B2
• Time in Patent Office: Days
• US Class Current: 370/280
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0082 at predetermined intervals
• CPC Class Codes: H04L 5/143 for modulated signals H04L5/1469 takes precedence
• CPC Class Codes: H04W 56/00 Synchronisation arrangements
• CPC Class Codes: H04W 72/00 Local resource management
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames

Abstract

A method for multiplexing synchronous signals on specific OFDM symbols to form P-SCH and the S-SCH channels is provided. The present application further discloses a method for transmitting P-BCH.

Claims

1. A method for transmitting a synchronous channel, comprising:

generating synchronous signals transmitted on a Primary Synchronous Channel (P-SCH) and a Secondary Synchronous Channel (S-SCH);

multiplexing the synchronous signals to specific Orthogonal Frequency Division Multiplexing (OFDM) symbols to form the P-SCH and the S-SCH channels, wherein the specific OFDM symbols do not bear thereon any of a User-specific Demodulation Reference Signal (DMRS), a Channel State Indication Reference Signal (CSI-RS) or a Tracking Reference Signal (TRS); and

transmitting the P-SCH and the S-SCH channels.

2. The method of claim 1, wherein the method is applied in at least one of a Frequency Division Duplex (FDD) or Time Division Duplex (TDD) communication system, and P-SCH and 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 channels comprise any of the following bearing modes:

OFDM symbol 0 of Downlink Pilot Time Slot (DwPTS) bears the P-SCH channel;

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

the previous two OFDM symbols of DwPTS respectively transmit the P-SCH and the S-SCH channels.

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

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

OFDM symbol 2 of the first time slot bears the S-SCH channel; and

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

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

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

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

6. A method for receiving a synchronous channel, comprising:

detecting and receiving signals;

demultiplexing specific Orthogonal Frequency Division Multiplexing (OFDM) symbols to obtain synchronous signals of a Primary Synchronous Channel (P-SCH) and a Secondary Synchronous Channel (S-SCH), wherein the specific OFDM symbols do not bear thereon any of a User-specific Demodulation Reference Signal (DMRS), a Channel State Indication Reference Signal (CSI-RS) or a Tracking Reference Signal (TRS); and

carrying out system synchronization based on the synchronous signals.

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

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

obtaining a synchronous signal of P-SCH channel from OFDM symbol 0 of Downlink Pilot Time Slot (DwPTS);

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

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

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

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

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

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

10. A method for transmitting a broadcasting channel, comprising:

generating a broadcasting signal to be transmitted on a Primary Broadcasting Channel (P-BCH);

multiplexing the broadcasting signal to corresponding Orthogonal Frequency Division Multiplexing (OFDM) symbols to form the P-BCH, wherein the corresponding OFDM symbols do not bear thereon any of a Channel State Indication Reference Signal (CSI-RS) or synchronous signals; and

transmitting the P-BCH channel.

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

any OFDM symbols that can be used for bearing CSI-RS for each of a Frequency Division Duplex (FDD) or a Time Division Duplex (TDD) communication system, or

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

12. The method of claim 10, wherein, for each burst of P-BCH channel, 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 corresponding OFDM symbols occupied by the P-BCH channel are determined by an OFDM symbol of a User-specific Demodulation Reference Signal (DMRS).

14. The method of claim 12, wherein the P-BCH channel is mapped to 4 OFDM symbols that transmit Tracking Reference Signal (TRS).

15. The method of claim 10, wherein OFDM symbols, except for OFDM symbols in a sub-frame for transmitting CSI-RS and synchronous signals, are used for transmitting the P-BCH channel.

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

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

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

17. The method of claim 10, wherein the P-BCH channel 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 the middle of the frequency band; and

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

18. A method for receiving a broadcasting channel, comprising:

detecting and receiving signals;

demultiplexing a broadcasting signal from corresponding Orthogonal Frequency Division Multiplexing (OFDM) symbols to obtain a broadcasting signal transmitted on a Primary Broadcasting Channel (P-BCH), wherein the corresponding OFDM symbols do not bear thereon any of a Channel State Indication Reference Signal (CSI-RS) or synchronous signals; and

obtaining broadcasting information based on the broadcasting signal.

19. The method of claim 18, wherein the corresponding OFDM symbols are not:

any OFDM symbols that can be used for bearing CSI-RS for each of Frequency Division Duplex (FDD) or a Time Division Duplex (TDD) communication system, or

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

20. The method of claim 18, wherein OFDM symbols, except for OFDM symbols in a sub-frame for transmitting CSI-RS and synchronous signals, are used for demultiplexing to obtain the P-BCH channel.

21. The method of claim 20, wherein the P-BCH channel is transmitted in any of the following modes:

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

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

22. The method of claim 18, wherein the P-BCH channel 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 the middle of the frequency band; and

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

23. A base station device, comprising:

a signal generating module configured to generate synchronous signals to be transmitted on a Primary Synchronous Channel (P-SCH) and a Secondary Synchronous Channel (S-SCH);

a multiplexing module configured to multiplex the synchronous signals to specific Orthogonal Frequency Division Multiplexing (OFDM) symbols to form the P-SCH and the S-SCH channels, wherein the specific OFDM symbols do not bear thereon any of a User-specific Demodulation Reference Signal (DMRS), a Channel State Indication Reference Signal (CSI-RS) or a Tracking Reference Signal (TRS); and

a transmitting module configured to transmit the P-SCH and the S-SCH channels.

24. The base station device of claim 23, wherein the base station device is in a Frequency Division Duplex (FDD) or Time Division Duplex (TDD) communication system, and P-SCH and S-SCH have the same relative positions in the two communication systems.

25. A terminal device, comprising:

a receiving module configured to detect and receive signals;

a demultiplexing module configured to demultiplex specific Orthogonal Frequency Division Multiplexing (OFDM) symbols to obtain synchronous signals of a Primary Synchronous Channel (P-SCH) and a Secondary Synchronous Channel (S-SCH), wherein the specific OFDM symbols do not bear thereon any of a User-specific Demodulation Reference Signal (DMRS), a Channel State Indication Reference Signal (CSI-RS) or a Tracking Reference Signal (TRS); and

a synchronizing module configured to carry out system synchronization based on the synchronous signals.

26. The terminal device of claim 25, wherein the terminal device is in a Frequency Division Duplex (FDD) or a Time Division Duplex (TDD) communication system, and P-SCH and S-SCH have the same relative positions in the two communication systems.

27. A base station device, comprising:

a signal generating module for generating a broadcasting signal transmitted on P-BCH channel;

a multiplexing module configured to multiplex the broadcasting signal to the corresponding OFDM symbols to form the P-BCH, wherein, the corresponding OFDM symbols do not bear thereon any of a Channel State Indication Reference Signal (CSI-RS) or synchronous signals; and

a transmitting module for transmitting the P-BCH channel.

28. A terminal device, comprising:

a receiving module configured to detect and receive signals;

a demultiplexing module configured to demultiplex a broadcasting signal from corresponding Orthogonal Frequency Division Multiplexing (OFDM) symbols to obtain a broadcasting signal transmitted on a Primary Broadcasting Channel (P-BCH), wherein the corresponding OFDM symbols do not bear thereon any of a Channel State Indication Reference Signal (CSI-RS) or synchronous signals; and

an interpreting module configured to acquire broadcasting information based on the broadcasting signal.