C2 - CELL RE-SELECTION 28 April 2003 - Jeddah IDLE MODE OPERATION Cell Selection in Idle Mode • Radio Criteria C1 = (A - Max(B,0)) • A = Received Level Average - p1 • B = p2 - Maximum RF Output Power of the Mobile Station • p1 = rxLevelAccessMin Min. received level at the MS required for access to the system • p2 = msTxPowerMaxCCH Max. Tx power level an MS may use when accessing the system Parameter Value rxLevelAccessMin -110 ... -47 msTxPowerMaxCCH 5 … 43 Cell Reselection in IDLE Mode with C2 – Background C2 idle mode cell reselection parameters are used to ensure than MS is camped on the cell which has the highest probability for successful communication slow or fast moving MS Cell Reselection in IDLE Mode with C2 - Application cell attractiveness microcell macrocell time fast moving mobile BCCH slow moving mobile BCCH Cell Reselection in IDLE Mode with C2 - BTS Parameter Parameter Value (1) cellReselectParamInd Y (1) C2 reselection parameters are broadcast N (0) C2 reselection parameters are not broadcast C2 = C1 + cellReselectOffset - temporaryOffset*H(penaltyTime-T) ; penaltyTime < 640 C1 - cellReselectOffset ; penaltyTime = 640 H(x) = 1 when T < = penaltyTime 0 ... 126 (dB) (2) cellReselectOffset> penaltyTime 0 when T 2 dB step (5 = 10 dB) penaltyTime (3) 20 ... 640 (s) 20 s step (4) temporaryOffset 0 ... 70 (dB) 10 dB step (2 = 20 dB) Cell Reselection in IDLE Mode with C2 - Diagram dB C2 cellReselectOffset C1 temporaryOffset cellReselectOffset C2 time penaltyTime Cell Reselection in IDLE Mode with C2 - Example fast moving mobile slow moving mobile C1 C2 PET = 20 s; TEO = 30 dB; REO = 20 dB; Assume C1 for both = 32 1. During T = 0 – 19 s (within the set of PET) C2 = C1 + REO – TEO x H(PET – T) C2 = 32 + 20 – 30 x 1 = 22 ( C2 < C1; MS will be kept in Macro, Micro is NOT attractive ) 2. During T = 20 …… s (PET is over) C2 = C1 + REO – TEO x H(PET – T) C2 = 32 + 20 – 30 x 0 = 52 ( C2 > C1; Micro is attractive, MS will camp on Micro ) Cell Reselection in IDLE Mode with C2 - Nokia Saudi C2 RESELECTION DEFAULT PARAMETERS (ENABLE): CELL RESELECTION PARAMETER INDEX (PI) : Y CELL RESELECT OFFSET (REO) : 20 dB TEMPORARY OFFSET (TEO) : 10 dB PENALTY TIME (PET) : 10 s (?) Cell Reselection in IDLE Mode with C2 - Application Indoor Scenario in Idle Mode C2 C1
"C2 in GSM"