Software Overview

For more on the WiMAX technology, see the following:

http://www.cisco.com/web/about/ac123/ac147/archived_issues/ipj_11-2/112_wimax.html

WiMAX Link QoS

QoS is configured on the base station. The IEEE standard 802.16e provides the ability to define Quality of Service (QoS) for different data streams. It contains definitions of available parameters and scheduling types. The responsibility of QoS is split between the base station and the mobile stations. The base station scheduler is in control of managing the overall QoS of the system. However, the mobile station uplink scheduler is responsible for QoS management between service flows allocated to that MS. The base-station scheduler is entirely responsible for the downlink scheduling.

The WIMAX protocol follows the Request for Connection; Grant for Terminal model. In this model, the mobile station issues bandwidth requests that indicate the pending demand for each connection. The base station scheduler, using this information, generates an uplink grant (a grant is the time and frequency allocation for uplink transmission). The mobile station uplink scheduler uses this grant to allocate access to the uplink for its service flows based on its local knowledge of service flow priorities. The mobile station uplink scheduler can be configured for different behavior.

WiMAX connections are defined by service flows. Each service flow is described in terms of QoS parameters and policy of allocations. Service flows contain classification rules which assign packets to specified connection.

QoS Support

In the Mobile WiMAX MAC layer, QoS is provided through service flows. This is a unidirectional flow of packets that is provided with a particular set of QoS parameters. Before providing a certain type of data service, the base station and user-terminal first establish a unidirectional logical link between the peer MACs called connection. The outbound MAC then associates packets traversing the MAC interface into a service flow to be delivered over the connection. The QoS parameters associated with the service flow define the transmission ordering and scheduling on the air interface.

The connection-oriented QoS therefore, can provide accurate control over the air interface. Since the air interface is usually the bottleneck, the connection-oriented QoS can effectively enable the end-to-end QoS control. The service flow parameters can be dynamically managed through MAC messages to accommodate the dynamic service demand. The service flow based QoS mechanism applies to both DL and UL to provide improved QoS in both directions. Mobile WiMAX supports a wide range of data services and applications with varied QoS requirements.

QoS Output

The following is sample QoS configuration on a base station:

 

 

 

Router(config-if)#show interface wimax 4/1 service-flows brief

 

 

 

 

 

 

sfid

cid

bcid

type

state

direction

rules

arq

harq

-----------------------------------------------------------------------------

 

0

3

3

basic

active

Bidirectional

0

NO

NO

0

515

3

primary

active

Bidirectional

0

NO

NO

4294959123

1034

3

data

active

Downlink

0

NO

NO

8007

1045

3

data

active

Downlink

1

NO

YES

8008

1028

3

data

active

Uplink

1

NO

YES

8091

1026

3

data

active

Downlink

1

NO

YES

8092

1040

3

data

active

Uplink

1

NO

YES

 

 

 

Cisco Connected Grid Modules for CGR 1000 Series—WiMAX Installation and Configuration Guide

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

14

 

 

 

 

 

 

 

 

 

OL-26236-03

 

 

 

 

 

 

 

 

 

 

 

 

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Cisco Systems CGR1120K9 manual WiMAX Link QoS, QoS Support, QoS Output, 8091 1026 Data, Downlink
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CGR1120K9 specifications

Cisco Systems CGR1120K9 is a robust networking device designed specifically for the Internet of Things (IoT) and industrial applications. As a part of the Cisco Connected Grid Router series, the CGR1120K9 delivers reliable connectivity and supports various networking functionalities to enhance operational efficiency in challenging environments.

One of the prominent features of the CGR1120K9 is its rugged design, built to withstand harsh conditions typical in industrial settings. With an operating temperature range of -40 to +85 degrees Celsius, it is ideal for use in outdoor and remote locations, making it suitable for utilities, transportation, and critical infrastructure industries. Its compact form factor allows for flexible installation options, which is crucial in space-constrained environments.

The CGR1120K9 comes equipped with a range of interfaces, including Ethernet ports and serial interfaces, providing versatility in integrating with different devices and systems. It supports both wired and wireless connections, enabling seamless communication across the IoT landscape. Additionally, the router features a dedicated management interface for simplified configuration and monitoring, ensuring that network administrators can efficiently manage their deployments.

In terms of performance, the CGR1120K9 features advanced routing and security capabilities, including support for IPv6, virtual private networks (VPNs), and firewall functionalities. This ensures secure data transmission over the network while maintaining high-performance levels essential for real-time applications. The device is powered by Cisco's IOS XE software, which offers enhanced operational capabilities through advanced features such as software-defined networking (SDN) and automation.

Another key characteristic of the CGR1120K9 is its scalability. Organizations can easily expand their networks as their needs evolve, ensuring an investment that grows with them. The router is designed to work cost-effectively in both small and large-scale deployments, making it a flexible choice for various business environments.

The CGR1120K9 also supports a range of protocols and standards, ensuring compatibility with existing infrastructure and devices. This is crucial for organizations seeking to modernize their networks while leveraging existing investments in hardware and software.

In conclusion, the Cisco Systems CGR1120K9 stands out as a high-performance, rugged router tailored for the demands of IoT and industrial applications. With its robust features, advanced technologies, and characteristics, it empowers organizations to enhance connectivity and streamline operations in even the most challenging environments.
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