Changes between Version 12 and Version 13 of Internal/WiMAX


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Timestamp:
May 3, 2010, 2:56:05 PM (14 years ago)
Author:
shweta
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  • Internal/WiMAX

    v12 v13  
    1313
    1414The NEC WiMAX base-station hardware (see photo below) is a 5U rack based system which consists of multiple Channel Cards (CHC) and a Network Interface Card. The shelf can be populated with up to three channel cards, each supporting one sector for a maximum of three sectors. The BS operates in the 2.5 Ghz or the 3.5 Ghz bands and can be tuned to use either 5, 7 or 10 Mhz channels. At the MAC frame level, 5 msec frames are supported as per the 802.16e standard. The TDD standard for multiplexing is supported where the sub-channels for the Downlink (DL) and Uplink (UL) can be partitioned in multiple time-frequency configurations. The base-station supports standard adaptive modulation schemes based on QPSK, 16QAM and 64QAM. The interface card provides one Ethernet Interface (10/100/1000) which will be used to connect to the high performance PC used to control the device. The base station has been tested for radio coverage and performance in realistic urban environments and is being used in early WiMAX deployments – typical coverage radius is ~3-5Km, and peak service bit-rates achievable range from 15-30 Mbps depending on operating mode and terrain.
    15 == Software ==
    16 
    17 [[Image(SysArch.jpg, 500)]]
    18 
    19 The virtualized WiMAX Basestation Transceiver (BTS) system consists of [wiki:Internal/WiMAX/WiMAXAPI different sets of APIs] shared by components of the system. A brief overview of the interaction between different system components is as shown in the Figure 1. The [wiki:Internal/WiMAX/AggMgr/ogs_wimaxvm slice manager (SM)] service allows the user to perform basic setup functions such as slice creation, instantiation, and destruction. The Radio management (RM) grid service allows the user to invoke all the WiMAX radio functionalities when operating as part of a slice. The SM and RM services in turn talk to other system components such as the datapath controller and NEC BS controller to execute API invoked by the Slice owners.  The Datapath controller module is responsible for laying out the L2 datapath from the slice virtual machines to the physical WiMAX BTS. The [wiki:Internal/WiMAX/NecBSContr NEC BTS controller] allows for the getting and setting of various WiMAX radio features.