Signalling arrangement for inter-site carrier aggregation having only single component carrier available in uplink direction

1. An apparatus comprising:

a transceiver, said transceiver being configured to be connectable to a first network node by a first downlink component carrier and to at least one second network node by at least one second downlink component carrier, wherein said transceiver is configured for simultaneous downlink data reception on the first downlink component carrier from the first network node and on the at least one second downlink component carrier from the at least one second network node, and wherein the transceiver is further configured to provide only a single component carrier for an uplink connection;

at least one processor; and

at least one memory including computer program code, wherein the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus at least to:

control the transceiver to share the single component carrier for the uplink connection among a first uplink signaling to the first network node and at least one second uplink signaling to the at least one second network node, wherein sharing among the first uplink signaling and the at least one second uplink signaling is performed in a time-divisional multiplexed manner.

2. The apparatus according to claim 1 , wherein the at least one memory and the computer program code, with the at least one processor, are further configured to apply a pre-defined uplink time division on the uplink connection related to the first downlink component carrier and the at least one second downlink component carrier.

3. The apparatus according to claim 1 , wherein the at least one memory and the computer program code, with the at least one processor are further configured to perform a frame synchronization among the first uplink signaling and the at least one second uplink signaling.

4. The apparatus according to claim 1 , wherein the at least one memory and the computer program code, with the at least one processor; are further configured to schedule timing of control signals to be sent via the first uplink signaling and the at least one second uplink signaling according to a predetermined rule with respect to the sharing among the first uplink signaling and the at least one second uplink signaling.

5. An apparatus comprising:

at least one processor; and

at least one memory including computer program code, wherein the at least one memory and the computer code are configured, with the at least one processor, to cause the apparatus at least to perform the following:

configuring a transceiver to be connectable to a user equipment by a first downlink component carrier and by only a single component carrier for an uplink connection, and

sharing the single component carrier for the uplink connection among a first uplink signaling for the apparatus and at least one second uplink signaling for at least one additional apparatus, wherein sharing among the first uplink signaling and the at least one second uplink signaling is performed in a time: divisional multiplexed manner.

6. The apparatus according to claim 5 , wherein, for the time-divisional multiplexed manner, a pre-defined uplink time division on the uplink connection is used, and wherein the at least one memory and the computer program code, with the at least one processor, are further configured to establish the pre-defined uplink time division, wherein the transceiver is further configured to send the pre-defined uplink time division to the user equipment and to the at least one additional apparatus.

7. The apparatus according to claim 5 , wherein predetermined sub-frames or single carrier frequency division multiple access symbols are scheduled for providing uplink signaling switching time.

8. The apparatus according to claim 5 , wherein the at least one memory and the computer program code, with the at least one processor, are further configured to schedule timing of control signals to be sent via the first uplink signaling and the at least one second uplink signaling according to a predetermined rule with respect to the sharing of among the first uplink signaling and the at least one second uplink signaling.

9. An apparatus comprising:

at least one processor; and

at least one memory including computer program code, wherein the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus at least to:

establish a sharing of only a single component carrier for an uplink connection of a user entity equipment, wherein the user equipment is connectable to a first network node by a first downlink component carrier and to at least one second network node by at least one second downlink component carrier and by the uplink connection, wherein the sharing is used to share the single component carrier for the uplink connection among a first uplink signaling to the first network node and at least one second uplink signaling to the at least one second network node, and wherein the sharing among the first uplink signaling and the at least one second uplink signaling is performed in a time-divisional multiplexed manner, and the at least one processor is configured to establish a pre-defined time division.

10. The apparatus according to claim 9 , wherein the at least one memory and the computer program code, with the at least one processor are further configured to schedule predetermined sub-frames or single carrier frequency division multiple access symbols for providing uplink signaling switching time.

11. The apparatus according to claim 9 wherein the at least one memory and the computer program code, with the at least one processor, are further configured to schedule timing of control signals to be sent via the first uplink signaling and the at least one second uplink signaling according to a predetermined rule with respect to the time division of the first uplink signaling and the at least one second uplink signaling.

12. A method comprising:

controlling a transceiver, said transceiver being configured to be connectable to a first network node by a first downlink component carrier and to at least one second network node by at least one second downlink component carrier, wherein said transceiver is configured for simultaneous downlink data reception on the first downlink component carrier from the first network node and on the at least one second downlink component carrier from the at least one second network node, and wherein the transceiver is further configured to provide only a single component carrier for an uplink connection; and

controlling the transceiver to share the single component carrier for the uplink connection among a first uplink signaling to the first network node and at least one second uplink signaling to the at least one second network node, wherein the sharing among the first uplink signaling and the at least one second uplink signaling is performed in a time-divisional multiplexed manner.

13. The method according to claim 12 , further comprising:

applying a pre-defined uplink time division on the uplink connection related to the first downlink component carrier and the at least one second downlink component carrier.

14. The method according to claim 12 , further comprising:

performing a frame synchronization among the first uplink signaling and the at least one second uplink signaling.

15. The method according to claim 12 , further comprising:

scheduling timing of control signals to be sent via the first uplink signaling and the at least one second uplink signaling according to a predetermined rule with respect to the sharing of among the first uplink signaling and the at least one second uplink signaling.

16. A computer program product comprising non-transitory computer-readable medium comprising code for performing a method according to claim 12 when run on at least one processor.