Transparent relay using dual-layer beam forming association procedures
View Patent ↗A system and method for use in a communication system that includes at least one base station and at least one relay node (RN) for communicating with a user agent (UA), the system comprising a base station that includes a processor and an antenna assembly capable of simultaneously transmitting at least first and second layer base station beams to the UA and a relay node (RN) that includes a processor and an antenna assembly capable of simultaneously transmitting at least first and second layer RN beams to the UA, wherein the first base station beam and first RN beam superpose on each other during transmission and the second base station beam and second RN beam superpose on each other during transmission so that the RN is transparent to the UA.
1. A system for use in a communication system that includes at least one base station and at least one relay node (RN) for communicating with a user agent (UA), the system comprising:
a base station that includes a processor and an antenna assembly capable of simultaneously transmitting at least first and second layer base station beams to the UA; and
a relay node (RN) that includes a processor and an antenna assembly capable of simultaneously transmitting at least first and second layer RN beams to the UA;
wherein the first base station beam and first RN beam superpose on each other during transmission and the second base station beam and second RN beam superpose on each other during transmission.
2. The system of claim 1 wherein the base station transmits data via resource blocks in at least the first and second layer base station beams and the RN transmits data via resource blocks in at least the first and second layer RN beams where each resource block includes resource elements and wherein at least a subset of the resource elements in each resource block transmitted by the base station include reference signals.
3. The system of claim 2 wherein reference signals in the resource blocks transmitted in the first layer base station beam are orthogonal to the reference signals in the resource blocks transmitted in at least the second layer base station beam.
4. The system of claim 3 wherein at least a subset of the resource elements in the resource blocks transmitted by the base station are common reference signals (CRS).
5. The system of claim 4 wherein at least a subset of the resource elements in the resource blocks transmitted by the base station are UA dedicated reference signals (DRS).
6. The system of claim 5 wherein at least a subset of the resource elements in the resource blocks transmitted by the RN are DRS.
7. The system of claim 6 wherein the DRS in resource blocks transmitted in the first layer base station beam and the first layer RN beam superpose in the air and wherein the DRS in resource blocks transmitted in the second layer base station beam and the second layer RN beam superpose in the air.
8. The system of claim 5 wherein the DRS in the resource blocks transmitted in the first layer RN beam are orthogonal to the DRS in the resource blocks transmitted in at least the second layer RN beam.
9. The system of claim 2 wherein only UA dedicated reference signals (DRS) are included in the resource blocks transmitted by the RN.
10. The system of claim 2 wherein both UA dedicated reference signals (DRS) and common reference signals (CRS) are included in the resource blocks transmitted by the RN.
11. The system of claim 1 wherein the RN transmits the first and second layer RN beams during re-transmission by the base station.
12. The system of claim 11 wherein the RN also transmits the first and second layer RN beams during initial transmissions by the base station.
13. The system of claim 1 wherein at least one of the RN and the base station receive signals from the UA and determine that the UA is proximate the RN.
14. The system of claim 1 wherein the base station and RN may transmit any combination of the first and second base station beams and the first and second layer RN beams simultaneously, depending on channel conditions.
15. A method for use in a communication system that includes at least one base station and at least one relay node (RN) for communicating with a user agent (UA), the method comprising the steps of:
simultaneously transmitting at least first and second layer base station beams from the base station to the UA; and
simultaneously transmitting at least first and second layer RN beams from the RN to the UA;
wherein the first base station beam and first RN beam superpose on each other during transmission and the second base station beam and second RN beam superpose on each other during transmission.
16. The method of claim 15 wherein the base station transmits data via resource blocks in at least the first and second layer base station beams and the RN transmits data via resource blocks in at least the first and second layer RN beams where each resource block includes resource elements and wherein at least a subset of the resource elements in each resource block transmitted by the base station include reference signals.
17. The method of claim 16 wherein reference signals in the resource blocks transmitted in the first layer base station beam are orthogonal to the reference signals in the resource blocks transmitted in at least the second layer base station beam.
18. The method of claim 17 wherein at least a subset of the resource elements in the resource blocks transmitted by the base station are common reference signals (CRS).
19. The method of claim 18 wherein at least a subset of the resource elements in the resource blocks transmitted by the base station are UA dedicated reference signals (DRS).
20. The method of claim 19 wherein at least a subset of the resource elements in the resource blocks transmitted by the RN are DRS.
21. The method of claim 20 wherein the DRS in resource blocks transmitted in the first layer base station beam and the first layer RN beam superpose in the air and wherein the DRS in resource blocks transmitted in the second layer base station beam and the second layer RN beam superpose in the air.
22. The method of claim 19 wherein the DRS in the resource blocks transmitted in the first layer RN beam are orthogonal to the DRS in the resource blocks transmitted in at least the second layer RN beam.
23. The method of claim 16 wherein only UA dedicated reference signals (DRS) are included in the resource blocks transmitted by the RN.
24. The method of claim 16 wherein both UA dedicated reference signals (DRS) and common reference signals (CRS) are included in the resource blocks transmitted by the RN.
25. The method of claim 15 wherein the step of simultaneously transmitting at least first and second layer RN beams includes transmitting the first and second layer RN beams during re-transmission by the base station.
26. The method of claim 25 wherein the step of simultaneously transmitting at least first and second layer RN beams includes the RN also transmitting the first and second layer RN beams during initial transmissions by the base station.
27. The method of claim 15 further including the steps of at least one of the RN and the base station receiving signals from the UA and determining that the UA is proximate the RN.
28. The method of claim 15 wherein the base station and RN may transmit any combination of the first and second base station beams and the first and second layer RN beams simultaneously, depending on channel conditions.