TelecomStudy18

The 2G/3G inter-RAT handover involves the handover from GSM to UMTS and the handover from UMTS to GSM. The handover is controlled mainly by the network. For MSs in dedicated mode, inter-RAT handovers can be performed, including the emergency handover, better cell handover, inter-RAT load handover, and inter-RAT service handover. Inter-RAT Handover from UMTS to GSM MSs in dedicated mode can be handed over from a UMTS cell to a GSM cell. The handover decision and handover procedure are controlled by the RNC. The BSS considers the incoming handover from UMTS to GSM as a common inter-BSC handover.  The parameter Inter-RAT In BSC Handover Enable determines whether inter-RAT handover from UMTS to GSM is enabled. If Inter-RAT In BSC Handover Enable is set to No , the BSS rejects all the requests for the handover from UMTS to GSM. Inter-RAT Handover from GSM to UMTS The parameter Inter-RAT In BSC Handover Enable determines whether the inter-RAT handover from GSM to UMTS is...

Inter-cell RRM: HO, load balancing between cells Radio Bearer Control: setup, modifications and release of Radio Resources Connection Mgt. Control: UE State Management, MME-UE Connection Radio Admission Control eNode B Meas. collection and evaluation Dynamic Resource Allocation (Scheduler) IP Header Compression/ de-compression Access Layer Security: ciphering and integrity protection on the radio interface MME Selection at Attach of the UE User Data Routing to the SAE GW Transmission of Paging Msg coming from MME Transmission of Broadcast Info (e.g. System info, MBMS)

Congestion = all resources (Time-slot) are used and congestion measure in seconds and unit of congestion is Millisecond.  BLOCKING = Blocked requests, blocking measure in per event 

CELL LOAD SHARING Parameter Description Range Ericsson Default Value Remarks CLSSTATE Cell load sharing active/inactive for an individual cell ACTIVE, INACTIVE INACTIVE For CLSSTATE activation to have effect, CLSSTATE must be activated CLSACC Percentage of available full rate capable traffic channels in a target cell at or below which no handovers due to Cell Load sharing will be accepted 1 to 100 % 40% - CLSLEVEL Percentage of available full rate capable traffic channels at which or below which Cell load sharing evaluations are initiated. 0 to 99 % 20% The value of of CLSLEVEL must be less than the value of CLSACC HOCLSACC Handover due to cell load sharing accepted to this cell ON, OFF OFF - RHYST Hysteresis reduction parameter...

Overlaid Subcell Locating data Parameter Description Range Ericsson Dafault Value Remarks LOL Pathloss threshold. 0 to 200 Pathloss threshold. It defines the OL subcell coverage border in terms of the pathloss from the serving cell. LOLHYST 0 to 63 Hysteresis for the pathloss criterion during evaluations for the OL subcell coverage. DTCB: -63 to 63 -63 Distance to cell border threshold. It defines the OL subcell coverage border in terms of the signal strength difference between the active channel and the strongest neighbouring BCCHs. DTCBHYST 0 to 63 Hysteresis for the DTCB criterion during evaluations for the OL subcell coverage. NDIST 0 to 63 Distance to cell border additional threshold. NNCELLS ...

Intra cell handover Parameter Description Range Ericsson Dafault Value Remarks IHO Intra handover switch: ON - Intra cell handover is allowed; OFF - Intra cell is not allowed ON, OFF OFF - TMAXIHO Timer for handover counter 0 to 60 seconds 6 - TIHO Intra cell handover inhibition timer 0 to 60 seconds 10 - MAXIHO Maximum number of consecutive intra-cell handovers 0 to 15 3 - QOFFSETUL Offset for quality uplink  -50 to +50 dtqu 0 - QOFFSETDL Offset for quality downlink  -50 to +50 dtqu 0 - SSOFFSETUL Offset for signal strength uplink  -30 to +30 db 0 - SSOFFSETDL Offset for signal strength downlink ...

Urgency Conditions for Handover [Locating Algorithm] Parameter Description Range Ericsson Dafault Value Remarks TALIM Timing advance limit for handover - Urgency detection parameter 0 to 63 (normal cell) Bits periods (bp) 62 TALIM determines the maximum timing advance that the MS is recommended to use in the cell PSSBQ Signal strength penalty when handover due to bad quality. This penalty  is valid during PTIMBQ 0 to 63 db 10 dB - PSSTA Signal strength penalty when handover doe to too large timing advance. It is valid during PTIMTA 0 to 63 db 63 - PTIMBQ Penalty time when handover due to bad quality 0 to 600 seconds 10 - PTIMTA Penalty time when handover due to too large timing advance 0 to 600 seconds 10 ...