WIRELESS COMMUNICATIONS SYSTEMS SUPPORTING CARRIER AGGREGATION AND SELECTIVE DISTRIBUTED ROUTING OF SECONDARY CELL COMPONENT CARRIERS BASED ON CAPACITY DEMAND

1 . A wireless communications system, comprising:

a signal router circuit, comprising:

a plurality of signal source inputs each configured to receive a component carrier among a plurality of component carriers, the plurality of component carriers comprising a primary cell component carrier and a secondary cell component carrier;

a plurality of signal outputs each configured to couple to a remote unit among a plurality of remote units; and

a routing control input configured to receive a routing control signal indicating a routing configuration for routing the primary cell component carrier and the secondary cell component carrier to the plurality of signal outputs; and

a controller circuit comprising a routing control output coupled to the routing control input, the controller circuit configured to communicate the routing control signal indicating the routing configuration for:

routing the primary cell component carrier to each of the plurality of signal outputs; and

routing the secondary cell component carrier to a subset of the plurality of signal outputs less than all of the plurality of signal outputs.

2 . The wireless communications system of claim 1 , further comprising a capacity monitoring circuit communicatively coupled to the controller circuit and configured to monitor wireless capacity demand associated with the plurality of signal outputs;

wherein the routing configuration is based on the wireless capacity demand associated with the plurality of signal outputs.

3 . The wireless communications system of claim 2 , wherein the controller circuit determines the subset of the plurality of signal outputs for routing the secondary cell component carrier based on the subset of the plurality of signal outputs being associated with a respective wireless capacity demand which is higher than a first signal output not within the subset of the plurality of signal outputs.

4 . The wireless communications system of claim 2 , wherein the controller circuit determines the subset of the plurality of signal outputs for routing the secondary cell component carrier based on the subset of the plurality of signal outputs being associated with a respective wireless capacity demand which exceeds a threshold.

5 . The wireless communications system of claim 1 , further comprising the plurality of remote units each coupled to a corresponding signal output of the plurality of signal outputs.

6 . The wireless communications system of claim 5 , wherein in response to receiving the routing configuration from the controller circuit, the signal router circuit is configured to:

route the primary cell component carrier over each of the plurality of signal outputs to each of the plurality of remote units; and

route the secondary cell component carrier over the subset of the plurality of signal outputs to a corresponding subset of the plurality of remote units.

7 . The wireless communications system of claim 6 , wherein:

the plurality of signal source inputs are each configured to receive the component carrier among the plurality of component carriers in baseband; and

the signal router circuit is further configured to route the primary cell component carrier and the secondary cell component carrier in baseband.

8 . The wireless communications system of claim 7 , wherein:

each of the plurality of remote units is configured to transmit the primary cell component carrier on a first wireless channel; and

the subset of the plurality of remote units is configured to transmit the secondary cell component carrier on a second wireless channel.

9 . The wireless communications system of claim 1 , wherein:

the secondary cell component carrier is a first secondary cell component carrier;

the subset of the plurality of signal outputs is a first subset of the plurality of signal outputs;

the controller circuit is further configured to communicate the routing control signal indicating the routing configuration for routing a second secondary cell component carrier of the plurality of component carriers to a second subset of the plurality of signal outputs less than all of the plurality of signal outputs; and

the first subset of the plurality of signal outputs includes at least one signal output not included in the second subset of the plurality of signal outputs.

10 . The wireless communications system of claim 9 , further comprising a capacity monitoring circuit communicatively coupled to the controller circuit and configured to monitor wireless capacity demand associated with the plurality of signal outputs;

wherein:

the controller circuit determines the first subset of the plurality of signal outputs for routing the first secondary cell component carrier based on the first subset of the plurality of signal outputs associated with a respective wireless capacity demand which exceeds a first threshold; and

the controller circuit determines the second subset of the plurality of signal outputs for routing the second secondary cell component carrier based on the second subset of the plurality of signal outputs associated with a respective wireless capacity demand which exceeds a second threshold higher than the first threshold.

11 . The wireless communications system of claim 1 , further comprising a signal source circuit coupled to the plurality of signal source inputs of the signal router circuit;

wherein the signal source circuit is configured to:

transmit the primary cell component carrier in baseband to a first signal source input of the plurality of signal source inputs; and

transmit the secondary cell component carrier in baseband to a second signal source input of the plurality of signal source inputs.

12 . The wireless communications system of claim 11 , wherein the signal source circuit comprises an Evolved Node B (eNB) base station of a telecommunications network.

13 . The wireless communications system of claim 11 , further comprising the plurality of remote units each coupled to a corresponding signal output of the plurality of signal outputs;

wherein each remote unit of the plurality of remote units is configured to transmit the primary cell component carrier on a wireless channel.

14 . The wireless communications system of claim 1 , further comprising the plurality of remote units each coupled to a corresponding signal output of the plurality of signal outputs by an optical fiber communications link;

wherein:

each of the plurality of signal outputs comprises an electrical-to-optical (E-O) converter configured to transmit a respective optical communications signal by the optical fiber communications link according to the routing configuration for the plurality of component carriers; and

each remote unit of the plurality of remote units comprises an optical-to-electrical (O-E) converter configured to convert the respective optical communications signal into a respective electrical communications signal to interface with a radio frequency (RF) transmitter/receiver.

15 . The wireless communications system of claim 1 , wherein the primary cell component carrier comprises:

an uplink configured to transmit data from a mobile device to a telecommunications network; and

a downlink configured to transmit data from the telecommunications network to the mobile device.

16 . The wireless communications system of claim 15 , wherein the secondary cell component carrier comprises a downlink configured to transmit data from the telecommunications network to the mobile device.

17 . The wireless communications system of claim 1 , wherein:

the plurality of signal outputs is a first plurality of signal outputs;

the primary cell component carrier is a first primary cell component carrier;

the signal router circuit further comprises a second plurality of signal outputs; and

the controller circuit is further configured to communicate the routing control signal indicating the routing configuration for routing a second primary cell component carrier to each of the second plurality of signal outputs.

18 . A method for selectively routing a primary cell component carrier and a secondary cell component carrier from one or more signal source circuits to a plurality of remote units in a wireless communications system, comprising:

receiving the primary cell component carrier;

receiving the secondary cell component carrier;

routing the primary cell component carrier to each of the plurality of remote units; and

routing the secondary cell component carrier to a first remote unit and not to a second remote unit of the plurality of remote units.

19 . The method of claim 18 , further comprising monitoring wireless capacity demand associated with each of the plurality of remote units;

wherein the routing the secondary cell component carrier is based on the wireless capacity demand associated with each of the plurality of signal outputs.

20 . The method of claim 19 , wherein routing the secondary cell component carrier is further based on a first wireless capacity demand associated with the first remote unit exceeding a second wireless capacity demand at the second remote unit.

21 . The method of claim 19 , wherein routing the secondary cell component carrier is further based on a wireless capacity demand associated with the first remote unit exceeding a threshold.

22 . The method of claim 18 , wherein:

the primary cell component carrier is received and routed in baseband; and

the secondary cell component carrier is received and routed in baseband.

23 . The method of claim 22 , further comprising:

transmitting a first downlink for the primary cell component carrier on a first wireless channel via each of the plurality of remote units; and

receiving an uplink for the primary cell component carrier on the first wireless channel via at least one of the plurality of remote units.

24 . The method of claim 23 , further comprising transmitting a second downlink for the secondary cell component carrier on a second wireless channel via the first remote unit.

25 . The method of claim 18 , wherein receiving the primary cell component carrier comprises:

establishing a downlink with a telecommunications network, the downlink receiving data to be transmitted to a mobile device; and

establishing an uplink with the telecommunications network, the uplink transmitting data to the telecommunications network.

26 . The method of claim 25 , wherein receiving the secondary cell component carrier comprises establishing a second downlink with the telecommunications network without establishing a second uplink with the telecommunications network.

27 . The wireless communications system of claim 1 , wherein the plurality of signal outputs each configured to couple to a remote unit are configured to couple to a remote unit capable of wirelessly communicating with a mobile device.