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US 11,159,982 B2Granted
System and method for reduction in fronthaul interface bandwidth for cloud RAN
AssigneeMavenir Networks, Inc.
InventorSridhar Rajagopal
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Abstract
There are provided systems, methods, and interfaces for optimization of the fronthaul interface bandwidth for Radio Access Networks and Cloud Radio Access Networks.
Claims3
A cloud radio access network (CRAN) system, comprising:
- a baseband unit (BBU) having a centralized unit (CU) and a distributed unit (DU);
- a radio unit (RU) remote from the BBU, the RU comprising a radio frequency interface (RF) implemented in the RU and a plurality of antenna ports;
- and
- a fronthaul interface between the RU and the BBU;
- wherein a functional split of CRAN functions respectively assigned to CU and DU for the fronthaul interface between the BBU and the RU is dependent on a number of layers for all transmission modes (TM), and
- wherein the layer-dependent fronthaul interface between BBU and RU is configured with a common reference signal based transmission mode using a Common Public Radio Interface (eCPRI) section type separation message to distinguish the common reference signal based transmission mode from a user equipment (UE) specific reference signal based transmission mode, and wherein the RU interprets a beamforming index differently for the common reference signal based transmission mode than for the UE specific reference signal based transmission mode, the RU interpreting the beamforming index as a precoder index for the common reference signal based transmission mode.
3 more elements
A cloud radio access network (CRAN) system, comprising:
- a baseband unit (BBU) having a centralized unit (CU) and a distributed unit (DU);
- a radio unit (RU) remote from the BBU, the RU comprising a radio frequency interface (RF) implemented in the RU and a plurality of antenna ports;
- and
- a fronthaul interface between the RU and the BBU;
- wherein:
- a functional split of CRAN functions respectively assigned to CU and DU for the fronthaul interface between the BBU and the RU is dependent on a number of layers for all transmission modes (TM);
- the layer-dependent fronthaul interface between BBU and RU is configured with a common reference signal based transmission mode using a Common Public Radio Interface (eCPRI) section type separation message to distinguish the common reference signal based transmission mode from a user equipment (UE) specific reference signal based transmission mode;
- and
- the eCPRI message is configured to support layers for a plurality of UEs in a TM3 operation using separate section IDs in a separate section type for TM3 operation.
6 more elements
Dependencies are inferred from the claim text.