Automatic mapping and handling pim and other uplink interferences in digital distributed antenna systems
AssigneeAxell Wireless Ltd.
InventorsAbraham HASARCHI, Amir MEIR
Life of this patent
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Abstract
Disclosed herein is an algorithm that leverages the unique features and capabilities of a DCC-DAS in order to perform automatic measurements of uplink noise, PIM, and any uplink interference. Once an interference in the uplink is detected, this algorithm may automatically measure its parameters such as frequency, intensity, bandwidth, etc., and identify the source of the problem. It may automatically isolate and identify which element or cable of the DCC-DAS is the root cause of the problem or also which external source is generating the problem.
Claims23
A method for automatic mapping and handling noise and interference in a distributed antenna system (DAS), the method comprising:
- (a) measuring any excessive noise and interference in uplink channels of the DAS when one or more downlink channels of the DAS are muted,
- comparing any measured excessive noise and interference from step (a) to a desired noise level,
- wherein the desired noise level is determined by an initial DAS layout design of uplink channels of the DAS;
- (b) measuring any excessive noise and interference in uplink channels of the DAS when one or more of the downlink channels of the DAS are active in a zero traffic mode,
- comparing any measured excessive noise and interference from step (b) to the desired noise level;
- and
- (c) measuring any excessive noise and interference in uplink channels of the DAS when one or more of the downlink channels of the DAS are fully operational,
- comparing any measured excessive noise and interference from step (c) to the desired noise level and the excessive noise and interference measured in step (a);
- and to the zero traffic mode measurement (b)
A digital distributed antenna system (DAS) for coupling to output ports of a plurality of base transceiver stations (BTS's)
- a plurality of remote radio units (RRUs) in communication with mobile devices;
- a central digital hub for routing and processing digitized RF signals, wherein the central digital hub is coupled to the RRUs and to the BTS's;
- at least one uplink digital filter bank comprising a plurality of uplink digital filters, such digital filter bank in the plurality of the RRUs;
- and
- and each of the plurality of uplink digital filters being matched to a unique cell resource, each cell resource including at least one or more signals being received from one or more mobile devices in an uplink direction,
- wherein one or more the downlink channels are shut off or muted and in the uplink direction the DAS is able to:
- measure and map in one or more RRUs any excessive noise in one or more of uplink cell resources compared to the design levels,
- or measure and map one or more interferences that may be received or generated in one or more of the uplink cell resources due to one or more external or internal sources compared to the design levels
A digital distributed antenna system (DAS) for coupling to output ports of a plurality of base transceiver station (BTS's) comprising:
- a plurality of remote radio units (RRUs) in communication with mobile devices;
- a central digital hub for routing and processing digital RF signals, wherein the central digital hub is coupled to the RRUs and to the BTS's;
- at least one uplink digital filter bank comprising a plurality of uplink digital filters, such digital filter bank in the plurality of the RRUs;
- and
- and each of the plurality of uplink digital filters being matched to a unique cell resource, each cell resource including at least one or more signals being received from one or more mobile devices in an uplink direction, there being at least two separate and distinct cell resources;
- wherein one or more of the BTSs coupled to the DAS may be activated in zero traffic mode and the DAS measures and maps in one or more RRUs any excessive noise in one or more of uplink cell resources generated due to one or more downlink transmissions such as PIM signals or any other interference generated in the uplink path by downlink transmission.
A digital distributed antenna system (DAS) for coupling to output ports of a plurality of base transceiver station (BTS's) comprising:
- a plurality of remote radio units (RRUs) in communication with mobile devices;
- a central digital hub for routing and processing digital RF signals, wherein the central digital hub is coupled to the RRUs and to the BTS's;
- at least one uplink digital filter bank comprising a plurality of uplink digital filters, such digital filter bank in the plurality of the RRUs;
- and
- and each of the plurality of uplink digital filters being matched to a unique cell resource, each cell resource including at least one or more signals being received from one or more mobile devices in an uplink direction, there being at least two separate and distinct cell resources;
- wherein one or more of the synthesizers in the DAS are activated by the DAS to simulate downlink transmission and the DAS measures and maps in one or more RRUs any excessive noise in one or more of uplink cell resources generated due to one or more downlink transmissions such as PIM signals or any other interference generated in the uplink path by downlink transmission.
Dependencies are inferred from the claim text.