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1. (WO2019048027) NETWORK NODE, A FIRST CLIENT DEVICE, A SECOND CLIENT DEVICE AND METHODS THEREOF
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CLAIMS

1. A network node (100) for a wireless communication system (500), the network node (100) being configured to

obtain a first message (M1 ) addressed for a first client device (300a);

obtain a second message (M2) addressed for a second client device (300b);

split the second message (M2) into a first sub-message (SM1 ) and a second sub-message (SM2), wherein the first sub-message (SM1 ) is addressed for the second client device (300b) via the first client device (300a);

generate a first communication signal (CS1 ) comprising the first message (M1 ) and the first sub-message (SM1 );

generate a second communication signal (CS2) comprising the second sub-message (SM2);

combine the first communication signal (CS1 ) and second communication signal (CS2) into a superposed communication signal (SCS);

transmit the superposed communication signal (SCS) concurrently to the first client device (300a) and the second client device (300b).

2. The network node (100) according to claim 1 , configured to split the second message (M2) into the first sub-message (SM1 ) and the second sub-message (SM2) based on

a first channel quality measure (CQM1 ) associated with a first radio channel (502) from the network node (100) to the first client device (300a); and

a second channel quality measure (CQM2) associated with a second radio channel (504) from the network node (100) to the second client device (300b).

3. The network node (100) according to claim 2, configured to split the second message (M2) into the first sub-message (SM1 ) and the second sub-message (SM2) further based on

a third channel quality measure (CQM3) associated with a third radio channel (506) from the first client device (300a) to the second client device (300b).

4. The network node (100) according any of the preceding claims, configured to

concatenate the first message (M1 ) and the first sub-message (SM1 ) to obtain a joint concatenated message;

encode and modulate the joint concatenated message so as to obtain the first communication signal (CS1 ).

5. The network node (100) according to any of the preceding claims, configured to

encode and modulate the first message (M1 ) to obtain a modulated first message (M1 ); encode and modulate the first sub-message (SM1 ) to obtain a modulated first sub-message (SM1 );

concatenate the modulated first message (M1 ) and the modulated first sub-message (SM1 ) so as to obtain the first communication signal (CS1 ).

6. The network node (100) according to any of the preceding claims, configured to

generate a first control signal (C1 ) comprising a first control information associated with the transmission of the superposed communication signal (SCS) to the first client device (300a);

generate a second control signal (C2) comprising a second control information associated with the transmission of the superposed communication signal (SCS) to the second client device (300b);

transmit the first control signal (C1 ) to the first client device (300a) and the second control signal (C2) to the second client device (300b) previous to the transmission of the superposed communication signal (SCS).

7. The network node (100) according to claim 6, wherein the first control information indicates at least one of: downlink scheduling information for the first client device (300a), a presence of the first sub-message (SM1 ) in the first communication signal (CS1 ), a size of the first sub-message (SM1 ) in the first communication signal (CS1 ), and a power ratio for the first communication signal (CS1 ) in the superposed communication signal (SCS).

8. The network node (100) according to claim 6 or 7, wherein the second control information indicates at least one of: downlink scheduling information for the second client device (300b), a presence of the first sub-message (SM1 ) in the first communication signal (CS1 ), and a size of the first sub-message (SM1 ) in the first communication signal (CS1 ).

9. The network node (100) according to any of claims 6 to 8, configured to

generate a third control signal (C3) comprising a third control information associated with a transmission of the first sub-message (SM1 ) to the second client device (300b);

generate a fourth control signal (C4) comprising a fourth control information associated with a reception of the first sub-message (SM1 ) from the first client device (300a);

transmit the third control signal (C3) to the first client device (300a);

transmit the fourth control signal (C4) to the second client device (300b).

10. A first client device (300a) for a wireless communication system (500), the first client device (300a) being configured to

receive a first superposed communication signal (SCSI ) from a network node (100), the first superposed communication signal (SCSI ) comprising a first communication signal (CS1 ) and a second communication signal (CS2), wherein the first communication signal (CS1 ) comprises a first message (M1 ) and a first sub-message (SM1 ) and the second communication signal (CS2) comprises a second sub-message (SM2), wherein the first sub-message (SM1 ) is addressed for the second client device (300b) via the first client device (300a);

interference cancel the second communication signal (CS2) in the first superposed communication signal (SCSI );

derive the first sub-message (SM1 ) from the interference cancelled first superposed communication signal (SCSI );

generate a third communication signal (CS3) comprising the first sub-message (SM1 ); transmit the third communication signal (CS3) to the second client device (300b).

1 1. The first client device (300a) according to claim 10, configured to

receive a first control signal (C1 ) previous to the reception of the first superposed communication signal (SCSI ), wherein the first control signal (C1 ) comprises a first control information associated with the transmission of the first superposed communication signal (SCSI ) from the network node (100);

derive the first sub-message (SM1 ) from the interference cancelled first superposed communication signal (SCSI ) based on the first control information.

12 The first client device (300a) according to claim 1 1 , wherein the first control information indicates at least one of: downlink scheduling information for the first client device (300a), a presence of the first sub-message (SM1 ) in the first communication signal (CS1 ), a size of the first sub-message (SM1 ) in the first communication signal (CS1 ), and a power ratio for the first communication signal (CS1 ) in the first superposed communication signal (SCSI ).

13. The first client device (300a) according to claim 1 1 or 12, configured to

receive a third control signal (C3) from the network node (100), the third control signal (C3) comprising a third control information associated with the transmission of the first sub-message (SM1 ) to the second client device (300b);

transmit the third communication signal (CS3) to the second client device (300b) based on the third control information.

14. The first client device (300a) according to any of claims 10 to 13, configured to

receive a second superposed communication signal (SCS2) from the network node (100), the second superposed communication signal (SCS2) comprising a first communication signal (CS1 ') and a second communication signal (CS2'), wherein the first communication signal (CS1 ') comprises a first message (M1 ') and a first sub-message (SM1 ') and the second communication signal (CS2') comprises a second sub-message (SM2'), wherein the first sub-message (SM1 ') is addressed for the first client device (300a) via the second client device (300b);

derive the second sub-message (SM2') from the second superposed communication signal (SCS2);

receive a third communication signal (CS3') from the second client device (300b), wherein the third communication signal (CS3') comprises the first sub-message (SM1 '); derive the first sub-message (SM1 ') from the third communication signal (CS3');

concatenate the first sub-message (SM1 ') and the second sub-message (SM2') so as to obtain a second message (Μ2').

15. A method (200) for a network node, the method comprising

obtaining (202) a first message (M1 ) addressed for a first client device (300a);

obtaining (204) a second message (M2) addressed for a second client device (300b); splitting (206) the second message (M2) into a first sub-message (SM1 ) and a second sub-message (SM2), wherein the first sub-message (SM1 ) is addressed for the second client device (300b) via the first client device (300a);

generating (208) a first communication signal (CS1 ) comprising the first message (M1 ) and the first sub-message (SM1 );

generating (210) a second communication signal (CS2) comprising the second sub-message (SM2);

combining (212) the first communication signal (CS1 ) and second communication signal (CS2) into a superposed communication signal (SCS);

transmitting (214) the superposed communication signal (SCS) concurrently to the first client device (300a) and the second client device (300b).

16. A method (400) for a client device, the method comprising

receiving (402) a first superposed communication signal (SCSI ) from a network node (100), the first superposed communication signal (SCSI ) comprising a first communication signal (CS1 ) and a second communication signal (CS2), wherein the first communication signal (CS1 ) comprises a first message (M1 ) and a first sub-message (SM1 ) and the second communication signal (CS2) comprises a second sub-message (SM2), wherein the first sub-

message (SM1 ) is addressed for the second client device (300b) via the first client device (300a);

interference cancelling (404) the second communication signal (CS2) in the first superposed communication signal (SCSI );

deriving (406) the first sub-message (SM1 ) from the interference cancelled first superposed communication signal (SCSI );

generating (408) a third communication signal (CS3) comprising the first sub-message (SM1 );

transmitting (410) the third communication signal (CS3) to the second client device (300b).

17. A computer program with a program code for performing a method according to claim 15 or 16 when the computer program runs on a computer.