METHOD FOR RECEIVING COMMON SIGNAL, METHOD FOR TRANSMITTING COMMON SIGNAL AND APPARATUSES THEREFOR AND COMMUNICATION SYSTEM

1 . An apparatus for receiving a common signal, applicable to a terminal equipment, the apparatus comprising processor circuitry configured to perform:

receiving master information block (MIB) information and/or system information block (SIB) information of one or more second cells transmitted by a first cell;

detecting a reference signal of the second cell; and

obtaining synchronization with the second cell via the detected reference signal of the second cell.

2 . The apparatus according to claim 1 , wherein the master information block (MIB) information of the second cell includes at least one of the following:

a cell barring ID;

an intra-frequency cell reselection ID;

a subcarrier spacing between SIB 1 , msg 2 / 4 and system information; or

position information of a demodulation reference signal (DMRS).

3 . The apparatus according to claim 1 , wherein the system information block (SIB) information of the second cell includes at least one of the following:

cell selection information;

cell access information;

system information (SI) scheduling information; or

access information based on a service category.

4 . The apparatus according to claim 1 , wherein the master information block (MIB) information and/or system information block (SIB) information of the second cell is/are carried by a system broadcast message of the first cell or a dedicated RRC message.

5 . The apparatus according to claim 4 , wherein the processor circuitry receives the master information block (MIB) information and/or system information block (SIB) information of the one or more second cells via a system broadcast message of the first cell;

and the processor circuitry further saves the master information block (MIB) information and/or system information block (SIB) information of the one or more second cells.

6 . The apparatus according to claim 5 , wherein,

after the terminal equipment obtains synchronization with the second cell, the processor circuitry further determines whether to save the master information block (MIB) information and/or system information block (SIB) information of the second cell;

and the processor circuitry enables the terminal equipment to camp on the second cell if the terminal equipment saves the master information block (MIB) information and/or system information block (SIB) information of the second cell.

7 . The apparatus according to claim 4 , wherein the dedicated RRC message is used for at least one of the following:

configuring a primary cell (PCell) of the terminal equipment as the second cell;

configuring a primary secondary cell (PSCell) of the terminal equipment as the second cell;

updating an access layer key of a primary cell group when the second cell is used as a PCell; or

updating an access layer key of a secondary cell group when the second cell is used as a PScell.

8 . The apparatus according to claim 4 , wherein the reference signal of the second cell includes a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) of the second cell, the primary synchronization signal (PSS) and the secondary synchronization signal (SSS) occupying one symbol respectively.

9 . The apparatus according to claim 4 , wherein the processor circuitry further,

receives a synchronization signal block (SSB) of the first cell transmitted by the first cell; and

obtains frame synchronization and timing synchronization with the first cell according to the synchronization signal block (SSB) of the first cell.

10 . The apparatus according to claim 4 , wherein the processor circuitry further,

receives indication information used for indicating whether timing of the first cell and the second cell is synchronized transmitted by the first cell.

11 . The apparatus according to claim 9 , wherein in a case where the first cell and the second cell are in frame synchronization, the processor circuitry further,

obtains frame synchronization information of the second cell according to frame synchronization information of the first cell, and

wherein the frame synchronization information includes a system frame number (SFN) and/or a half-frame indicator.

12 . The apparatus according to claim 11 , wherein the obtaining synchronization with the second cell via the detected reference signal of the second cell comprises:

obtaining frame synchronization and timing synchronization with the second cell by the processor circuitry according to a time-domain position of the synchronization signal block (SSB) of the first cell, an index of the synchronization signal block (SSB) of the first cell and a time-domain position of the reference signal of the second cell.

13 . The apparatus according to claim 11 , wherein the obtaining synchronization with the second cell via the detected reference signal of the second cell comprises:

obtaining a first index of the reference signal from the reference signal of the second cell; and

obtaining the frame synchronization and timing synchronization of the second cell according to the first index, the time-domain position of the reference signal of the second cell and a time-domain position of the SSB of the first cell.

14 . The apparatus according to claim 9 , wherein in a case where the first cell and the second cell are not in frame synchronization, the processor circuitry further,

receives frame synchronization offset information of the first cell and the second cell transmitted by the first cell, the frame synchronization offset information including a frame number offset, or a frame number offset and a half-frame offset.

15 . The apparatus according to claim 14 , wherein the processor circuitry further,

obtains frame synchronization information with the second cell according to the frame synchronization information of the first cell and the frame synchronization offset information, the frame synchronization information including a system frame number (SFN) and/or a half-frame indicator.

16 . The apparatus according to claim 15 , wherein the obtaining synchronization with the second cell via the detected reference signal of the second cell comprises:

obtaining frame synchronization and timing synchronization with the second cell by the processor circuitry according to a time-domain position of the synchronization signal block (SSB) of the first cell, an index of the synchronization signal block (SSB) of the first cell and a time-domain position of the reference signal of the second cell.

17 . The apparatus according to claim 15 , wherein the obtaining synchronization with the second cell via the detected reference signal of the second cell comprises:

obtaining a second index of the reference signal from the reference signal of the second cell; and

obtaining the frame synchronization and timing synchronization with the second cell according to the second index, a time-domain position of the reference signal of the second cell and a time-domain position of the SSB of the first cell.

18 . The apparatus according to claims 1 , wherein the master information block (MIB) information and the system information block (SIB) information of the second cell are carried by a broadcast message of the first cell or a dedicated RRC message,

and the processor circuitry further receives a physical broadcast channel (PBCH) payload transmitted by the second cell, the PBCH payload including a system frame number (SFN), and/or a half-frame indicator, and/or an index of the reference signal, of the second cell.

19 . The apparatus according to claim 18 , wherein the reference signal and the physical broadcast channel (PBCH) payload of the second cell occupy total two symbols,

and the reference signal of the second cell includes a primary synchronization signal (PSS) and a secondary synchronization signal (SSS), the primary synchronization signal (PSS) and the secondary synchronization signal (SSS) occupying one symbol respectively, and the physical broadcast channel (PBCH) payload being frequency-division multiplexed with the primary synchronization signal (PSS) and the secondary synchronization signal (SSS).

20 . The apparatus according to claim 18 , wherein the reference signal and the physical broadcast channel (PBCH) payload of the second cell occupy total three symbols;

and the reference signal of the second cell includes a primary synchronization signal (PSS) and a secondary synchronization signal (SSS), the primary synchronization signal (PSS) and the secondary synchronization signal (SSS) occupying one symbol respectively, and the physical broadcast channel (PBCH) payload being further frequency-division multiplexed or time-division multiplexed with the primary synchronization signal (PSS) or the secondary synchronization signal (SSS).