Transmit co-channel spectrum sharing

Abstract

An intelligent backhaul system is disclosed for deployment in the presence of existing radio systems. A backhaul system for co-channel deployment with existing licensed and unlicensed wireless networks, including conventional cellular backhaul radios, Common Carrier Fixed Point-to-Point Microwave Service, Private Operational Fixed Point-to-Point Microwave Service and other FCC 47 C.F.R. §101 licensed microwave networks is disclosed. Processing and network elements to manage and control the deployment and management of backhaul of radios that connect remote edge access networks to core networks in a geographic zone which co-exist with such existing systems or other sources of interference within a radio environment are also disclosed.

Description

BACKGROUND[0001]1. Field[0002]The present disclosure relates generally to data networking and in particular to a backhaul system for co-channel deployment with existing licensed and unlicensed wireless networks, and to processing and network elements to manage and control the deployment and management of backhaul radios that connect remote edge access networks to core networks in a geographic zone which co-exist with the existing wireless networks.[0003]2. Related Art[0004]Data networking traffic has grown at approximately 100% per year for over 20 years and continues to grow at this pace. Only transport over optical fiber has shown the ability to keep pace with this ever-increasing data networking demand for core data networks. While deployment of optical fiber to an edge of the core data network would be advantageous from a network performance perspective, it is often impractical to connect all high bandwidth data networking points with optical fiber at all times. Instead, connect...

AI Technical Summary

Benefits of technology

[0023]These IBRs overcome the limitation of obstructed LOS operation and enable many desirable capabilities such as, for example only, monitoring of spectrum activity in the vicinity of the deployment and actively avoiding or mitigating co-channel interference. To fully utilize these and other capabilities of the IBRs, it is advantageous to manage and control multiple IBRs within a geographic zone collectively as an “Intelligent Backhaul System” (or IBS).

[0033]In some embodiments, the RE-IBRs and AE-IBRs may operate on channels for which no interference is detected, but are within a predetermined distance of a CBR. The distance may be determined based on the geographic location of each IBR and the CBR (e.g., the location of the CBR determined by accessing the FCC ULS database). In such situations, an interference margin value, or other operational constraint value, may be utilized by the IBMS based upon propagation models to further reduce the likelihood of interfering with the CBR.

Problems solved by technology

While deployment of optical fiber to an edge of the core data network would be advantageous from a network performance perspective, it is often impractical to connect all high bandwidth data networking points with optical fiber at all times. Instead, connections to remote edge access networks from core networks are often achieved with wireless radio, wireless infrared, and / or copper wireline technologies.

However, cellular base stations or WLAN access points inevitably become very high data bandwidth demand points that require continuous connectivity to an optical fiber core network.

These backhaul requirements cannot be practically satisfied at ranges of 300 m or more by existing copper wireline technologies.

Even if LAN technologies such as Ethernet over multiple dedicated twisted pair wiring or hybrid fiber / coax technologies such as cable modems are considered, it is impractical to backhaul at such data rates at these ranges (or at least without adding intermediate repeater equipment).

Such alignment is almost impossible to maintain over extended periods of time unless the two radios have a clear unobstructed line of sight (LOS) between them over the entire range of separation.

Furthermore, such precise alignment makes it impractical for any one such microwave backhaul radio to communicate effectively with multiple other radios simultaneously (i.e., a “point to multipoint” (PMP) configuration).

Although impressive performance results have been achieved for edge access, such results are generally inadequate for emerging backhaul requirements of data rates of 100 Mb / s or higher, ranges of 300 m or longer in obstructed LOS conditions, and latencies of 5 ms or less.

In particular, “street level” deployment of cellular base stations, WLAN access points or LAN gateways (e.g., deployment at street lamps, traffic lights, sides or rooftops of single or low-multiple story buildings) suffers from problems because there are significant obstructions for LOS in urban environments (e.g., tall buildings, or any environments where tall trees or uneven topography are present).

Because of their very narrow antenna radiation patterns and manual alignment requirements, these conventional microwave backhaul radios are completely unsuitable for applications with remote data network backhaul in obstructed LOS conditions, such as deployment on street lamps, traffic lights, low building sides or rooftops, or any fixture where trees, buildings, hills, etc., which substantially impede radio propagation from one point to another.

Additionally, such conventional microwave backhaul radios typically have little or no mechanism for avoiding unwanted interference from other radio devices at the same channel frequency (other than the narrowness of their radiation patterns).

Thus, users of such equipment are often skeptical of deployment of such conventional backhaul radios for critical applications in unlicensed spectrum bands.

This is slow, inefficient, and error prone as well as wasteful of spectrum resources due to underutilization, even with the undesirable restriction of unobstructed LOS conditions.

Furthermore, once deployed in the field, conventional microwave backhaul radios are typically islands of connectivity with little or no capability to monitor the spectrum usage broadly at the deployment location or coordinate with other radios in the vicinity to optimally use spectrum resources.

However, such a conventional EMS 216 does not dynamically modify operational policies or configurations at each CBR 132 in response to mutual interactions, changing network loads, or changes in the radio spectrum environment in the vicinity of the deployed CBRs 132.

As a result of the foregoing deficiencies with conventional backhaul radios and conventional approaches to obstructed line of sight systems, there exists no practical approach to the deployment, monitoring and operation of obstructed non-line of sight systems in the presence of unlicensed or licensed conventional backhaul radios or other licensed services according to 47 Code of Federal Regulations (C.F.R.) §101 within the same operational bands.

Further, such deficiencies prevent the rapid deployment of new backhaul radios configured for co-channel operation with these systems, including conventional backhaul radio networks and other 47 C.F.R. §101 systems.

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