Configurable antenna port selection for beam forming and MIMO in a telecommunications network
View Patent ↗A switching device and a method and medium for using the switching device are provided. The switching device is associated with a remote radio unit (RRU) and an antenna of a base station and comprises a plurality of switching cables arranged in predetermined configurations including a single-layer beam forming configuration, a dual-layer beam forming configuration, and a MIMO configuration. In response to inputs received from UEs served by the base station, the switching device can implement the configuration best-suited to target the UEs.
1. A switching device associated with a remote radio unit (RRU) and an antenna of a base station, the switching device comprising:
a RRU inlet side having a plurality of radio head port connecting terminals, wherein each radio head port connecting terminal of the plurality of radio head port connecting terminals is connected to a radio head port of the RRU by a data transmission cable;
an antenna inlet side having a plurality of antenna port connecting terminals, wherein each antenna port connecting terminal of the plurality of antenna port connecting terminals is connected to an antenna port of the antenna by a data transmission cable;
a plurality of sets of switching cables, each set of the plurality of sets of switching cables being associated with a radio head port connecting terminal of the plurality of radio head port connecting terminals, wherein each switching cable in the each set of switching cables connects the respective radio head port connecting terminal to one or more of the plurality of antenna port connecting terminals, wherein the plurality of sets of switching cables is configured in a single-layer beam forming configuration, a dual-layer beam forming configuration, and a multiple-in-multiple-out (MIMO) configuration; and
a plurality of switching units associated with the plurality of sets of switching cables for selectively switching between the configurations in response to one or more inputs received by the base station from UEs served by the base station,
wherein the switching device is interposed between the RRU and the antenna associated with the base station.
2. The switching device of claim 1 , wherein the switching device is separate from the RRU.
3. The switching device of claim 1 , wherein the switching device is integrated into the RRU.
4. The switching device of claim 1 , wherein the RRU is an 8 transmit/8 receive (8T/8R) RRU, and wherein the 8T/8R RRU is split into a first 4 transmit/4 receive (4T/4R) side carrying a first set of radio-frequency (RF) channels and a second 4T/4R side carrying a second set of RF channels, and wherein the first 4T/4R side comprises radio head ports 1 , 2 , 3 and 4 , and the second 4T/4R side comprises radio head ports 5 , 6 , 7 and 8 .
5. The switching device of claim 4 , wherein the antenna comprises an 8 element antenna having 8 antenna ports, and wherein the 8 element antenna comprises a first group of antenna elements and a second group of antenna elements, and wherein the first group of antenna elements is orthogonally cross-polarized at 90 degrees to the second group of antenna elements.
6. The switching device of claim 5 , wherein the first group of antenna elements comprises antenna elements 1 , 2 , 3 and 4 , and wherein the antenna elements 1 , 2 , 3 , and 4 are polarized at plus 45 degrees, and further wherein the antenna elements 1 , 2 , 3 and 4 are associated with antenna ports 1 , 2 , 3 and 4 .
7. The switching device of claim 6 , wherein the second group of antenna elements comprises antenna elements 5 , 6 , 7 and 8 , and wherein the antenna elements 5 , 6 , 7 , and 8 are polarized at minus 45 degrees, and further wherein the antenna elements 5 , 6 , 7 and 8 are associated with antenna ports 5 , 6 , 7 and 8 .
8. The switching device of claim 7 , wherein the single-layer beam forming configuration comprises:
radio head ports 1 , 2 , 3 and 4 connected to antenna ports 1 , 2 , 3 and 4 respectively via the plurality of sets of switching cables; and
radio head ports 5 , 6 , 7 , and 8 connected to antenna ports 5 , 6 , 7 and 8 respectively via the plurality of sets of switching cables.
9. The switching device of claim 7 , wherein the dual-layer beam forming configuration comprises:
radio head ports 1 , 2 , 3 and 4 connected to antenna ports 1 , 2 , 7 and 8 respectively via the plurality of sets of switching cables; and
radio head ports 5 , 6 , 7 and 8 connect to antenna ports 5 , 6 , 3 and 4 respectively via the plurality of sets of switching cables.
10. The switching device of claim 7 , wherein the MIMO configuration comprises:
radio head ports 1 , 2 , 3 and 4 connected to antenna ports 1 , 5 , 3 and 7 respectively via the plurality of sets of switching cables; and
radio head ports 5 , 6 , 7 and 8 connected to antenna ports 2 , 6 , 4 and 8 respectively via the plurality of sets of switching cables.