TelecomStudy18

The LTE RAN consists of these parts: §    RBS §    OSS-RC RAN components §    Interconnecting IP transport network The following figure shows the logical structure of a single RBS in LTE RAN and how it interconnects with other components of LTE RAN: Logically, each RBS is comprised of sectors, a digital unit, and a support system. Each sector is connected to one or a number of antenna unit groups. Connection to other RAN and core network elements is provided by the IP transport infrastructure. In some implementations, common elements of the RBS can be shared with other technologies such as WCDMA or GSM. Refer to RBS Configurations for further details. The following list defines terms used to describe parts of the LTE RBS: Antenna Unit Group An Antenna Unit Group (AUG) is the logical structure that includes all details of an antenna and associated equipment. This includes the antenna, and an...

Single Cell Function test SCFT is for verifying whether individual BTS works well or not, by making a single cell function test of BTS hardware and software. Essential items to be tested are as follows: 1) BTS Transmitter Output Measurement Test 2) Initial parameter establishment (Pilot PN/System ID/Site ID/Frequency, Neighbor List) 3) Call Origination and Termination Test 4) Softer Handoff Test/Antenna installation check (Direction, Tilt, Transmission Line) 5) Single Cell Coverage Test 6) Noise Floor Test 7) Parameter check.

WCDMA RAN WCDMA RAN is a part of the 3rd generation (3G) mobile system, and comprises: OSS-RC RNC RANAG RBS WCDMA RAN has interfaces towards the Core Network (CN), and towards the external Network Management Systems (NMS). WCDMA RAN provides Radio Access Bearers (RAB) between the CN and the subscriber's User Equipment (UE) for speech, data, and multimedia services. The Network Elements (NEs) RNC, RANAG, and RBS provide and manage the data links between WCDMA RAN and the UE. The links between the NEs in WCDMA RAN carry the user data within WCDMA RAN. These physical links are also used to carry O&M data. See figure for an overview of WCDMA RAN. 

TFNDROP :  The total number of dropped full-rate TCH in underlaid subcell. The counter is also available for half-rate and for overlaid subcells, e.g. THNDROPSUB . TFNCEDROP :  The total number of dropped full rate TCH connections in underlaid subcell that occur when a subscriber to subscriber connection has already been established. The establishment of subscriber to subscriber connection is assured if the connection  is dropped between the DTAP messages CONNECT ACKNOWLEDGE and RELEASE or DISCONNECT (whichever of RELEASE or DISCONNECT comes first). TFDISTA :  Total number of dropped full-rate TCH connections at excessive TA. Also available for half-rate, e.g. THDISTA . TFDISSSUL :  Total number of dropped full-rate TCH connection at low signal strength on uplink in underlaid subcell i.e. below LOWSSUL. Different combinations for overlaid subcell, up/down and both-way link and half-rate, e.g. THDISSSBLSUB is the signal strength drop counter  f...

TFNDROP :  The total number of dropped full-rate TCH in underlaid subcell. The counter is also available for half-rate and for overlaid subcells, e.g. THNDROPSUB . TFNCEDROP :  The total number of dropped full rate TCH connections in underlaid subcell that occur when a subscriber to subscriber connection has already been established. The establishment of subscriber to subscriber connection is assured if the connection  is dropped between the DTAP messages CONNECT ACKNOWLEDGE and RELEASE or DISCONNECT (whichever of RELEASE or DISCONNECT comes first). TFDISTA :  Total number of dropped full-rate TCH connections at excessive TA. Also available for half-rate, e.g. THDISTA . TFDISSSUL :  Total number of dropped full-rate TCH connection at low signal strength on uplink in underlaid subcell i.e. below LOWSSUL. Different combinations for overlaid subcell, up/down and both-way link and half-rate, e.g. THDISSSBLSUB is the signal strength drop counter...

HOVERCNT :  Number of Handover Commands sent to the MS. HOVERSUC :  Number of successful handover to the neighbouring cell. HORTTOCH :  Number of handovers that result in a return to the old channel after a failure of a handover attempt to a neighbouring cell. HODUPFT :  Number of successful handovers back to old cell within 10 seconds. HOTOKCL :  Handover attempt made to better K-cell (only for the Ericsson 1 locating algorithm). The corresponding for better L-cell is called HOTOLCL . HOTOHCS :   Handover attempt due to HCS. HODWNQA :  Number of handover attempts due to bad downlink quality. There is one HO counter for bad uplink quality called HOUPLQA and one for excessive timing advance called HOEXCTA . HOASBCL :  Number of assignment attempts to better cell. The corresponding counter for assignment to worse cell is called HOASWCL . HOSUCBCL :  Number of successful assignment attempts to better cell. The c...

HOAATOL Number of handover attempts from underlaid to overlaid subcell. The corresponding counter for handover tounderlaid subcell is called HOAATUL . HOSUCOL Number of successful assignment attempts to overlaid subcell. The corresponding counter for underlaid subcell is called HOSUCUL . HOATTULMAXIHO Number of handover attempts from OL to UL subcell due to maximum number of intracell handovers in OL subcell. HOSUCULMAXIHO Number of successful handover attempts from OL to UL subcell due to maximum number of intracell handovers in OL subcell. HOATTOLMAXIHO Number of handover attempts from UL to OL subcell due to maximum number of intracell handovers in UL subcell. HOSUCOLMAXIHO Number of successful handover attempts from UL to OL subcell due to maximum number of intracell handovers in UL subcell. LOLCOMUL Subcell change attempts from OL to UL when reaching LOL criteria for subcell change. LOLSUCUL Successful subcell changes from OL to UL when the LOL criter...

HOINUQA Number of intra cell handover attempts (decisions) at bad uplink quality. The corresponding counter for the downlink is HOINDQA and for both links is HOINBQA . Only HOINBQA is stepped at bad quality on both links. HOINSUC Number of successful intra cell handovers. HOINBOCH Number of unsuccessful intra cell handover attempts, MS back to old channel. BCDTCBCOM Number of intra-cell handover attempt out of BCCH channel group, BCCHDTCB criteria. BCLOSSCOM Number of intra-cell handover attempt out of BCCH channel group, BCCHLOSS criteria. BCDTCBSUC Number of successful intra-cell handover out of BCCH channel group, BCCHDTCB criteria. BCLOSSSUC Number of successful intra-cell handover out of BCCH channel group, BCCHLOSS criteria. HOATFRHRAMR Number of Intra Cell Handover Attempts due to FR to HR channel rate change made by an AMR capable mobile. HOSUCFRHRAMR Number of successful Intra Cell Handovers due to FR to HR channel rate change made by an AMR c...

TSQIGOOD Accumulated number of SQI samples that represented good speech quality. The corresponding counter for overlaid subcell is TSQIGOODSUB TSQIACCPT Accumulated number of SQI samples that represented acceptable speech quality. The corresponding counter for overlaid subcell is TSQIACCPTSUB TSQIBAD Accumulated number of SQI samples that represented unsatisfactory speech quality. The corresponding counter for overlaid subcell is TSQIBADSUB TSQIGOODAF Accumulated number of SQI samples for AMR full rate that represented good speech quality.  TSQIACCPTAF Accumulated number of SQI samples for AMR fullrate that represented acceptable speech quality. The corresponding counter for overlaid subcell is TSQIACCPTSUBAF TSQIBADAF Accumulated number of SQI samples for AMR full rate that represented unsatisfactory speech quality. The corresponding counter for overlaid subcell is TSQIBADSUBAF TSQIGOODAH Accumulated number of SQI samples for AMRhalf rate that represented...

CCONGS :  Congestion counter for underlaid subcell. Stepped each time an allocation attempt fails due to SDCCH congestion. Also available for overlaid subcells, CCONGSSUB . CTCONGS :  Congestion time counter for underlaid subcell. The counter is stepped each second all available SDCCH channels are busy. Also available for overlaid subcells, CTCONSUB . CSCSTCONG :   Congestion time counter for signalling connection setup for procedures requiring a TCH. Starts incrementing when a signalling connection setup attempt for a procedure requiring a TCH fails and stops incrementing when there is a successful signalling connection setup of any kind on a SDCCH or a TCH CSCSOPTCONG :   Congestion time counter for signalling connection setup for procedures that can be completed on a SDCCH. Starts incrementing when a signalling connection setup attempt for a procedure that can be completed on an SDCCH fails and stops incrementing when there is a successful signalling...