3G --> 2G Cell Re / selectionCell Re / selection Criteria S di define sbb :

Squal = Qqualmeas – Qqualmin

Srxlev = Qrxlevmeas - Qrxlevmin - Pcompensation

Dimana :

Squal : Cell Selection quality (dB)Qqualmeas : Measured cell quality valueQqualmin : Minimum required quality level in the cell (dB)

Srxlev : Cell Selection RX level value (dB)Qrxlevmeas : Measured cell RX level valueQrxlevmin : Minimum required RX level in the cell (dBm)

Pcompensation : max(UE_TXPWR_MAX_RACH – P_MAX, 0) in dB"UE_TXPWR_MAX_RACH" : Maximum TX power level an UE may use when accessing the cell on RACH (dBm)P_MAX : Maximum RF output power of the UE (dBm)

Cell Re / selection Criteria S akan terpenuhi jika :Squal > 0Srxlev > 0

Asumsi tidak menggunakan HCS maka :

If Squal > Sintrasearch, UE need not perform intra-frequency measurementsIf Squal <= Sintrasearch, perform intra-frequency measurements

If Squal > Sintersearch, UE need not perform inter-frequency measurementIf Squal <= Sintersearch, perform inter-frequency measurements

If Squal > SsearchRAT m, UE need not perform measurements on cells of RAT "m"If Squal <= SsearchRAT m, perform measurements on cells of RAT "m"

ex :Sintrasearch = 4 dB: Equate to –16dB Ec/NoSintersearch = 2 dB: Equate to –18dB Ec/NoSsearchRAT m, = 0dB: Equate to –20dB Ec/No

Parameter untuk Cell Re/Selection 3G --> 2G adalah :

HCS_PRIO : Defines the HCS priority level for a cell (def:0) (A_WCEL)

NCr : Defines the maximum number of cell reselections (def:8) (A_WCEL)

QHCS : Quality threshold level for applying prioritised hierarchical cell re-selection for a cell (def:WCDMA : -24) (A_WCEL)

Qhyst1 : Qhyst1 is used for TDD and GSM cells, and for FDD cells when cell selection and re-selection quality measure is set to CPICH RSCP (def:4) (A_WCEL)

Qhyst2 : Qhyst2 is used for FDD cells when cell selection and re-selection quality measure is set to CPICH Ec/No (def:4) (A_WCEL)

QqualMin : The minimum required quality level in the cell (Ec/No) (def:-20) (A_WCEL)

QrxlevMin : The minimum required RX level in the cell (def: WCDMA -115, GSM -105) (A_WCEL)

SHCS_RAT : The RAT specific threshold for inter-RAT measurement rules (def:1) (A_WCEL)

Sintersearch : The threshold for inter-frequency measurements, and for the HCS measurement rules (def:2) (A_WCEL)

Sintrasearch : The threshold for intra-frequency measurements, and for the HCS measurement rules (def:4) (A_WCEL)

Slimit_SearchRAT : Threshold for skipping inter-RAT measurement rules in HCS (def:2) (A_WCEL)

Ssearch_RAT : The RAT-specific threshold for inter-RAT measurement rules (def:0) (A_WCEL)

SsearchHCS : Threshold for intra- and interfrequency measurement rules in HCS (def:1) (A_WCEL)

TCrmax : The duration for evaluating the allowed amount of cell reselections (def:60sec) (A_WCEL)

TCrmaxHyst : Cell reselection hysteresis for reverting from UE high-mobility measurements (def:0sec) (A_WCEL)

Treselection : The UE triggers the reselection of a new cell if the cell reselection criteria are fulfilled during the time interval Treselection (def:0) (A_WCEL)

UseOfHCS : Indicates whether the serving cell belongs to a Hierarchical Cell Structure (HCS), or not (def:0) (A_WCEL)

2G -> 3G Cell Re / SelectionQsearchI (A_BTS)

With this parameter you define the threshold for dual mode mobiles in idle state to search for and to measure UTRAN neighbour cells introduced in 3G Cell Reselection list when a running average of the received downlink signal level (RLA_C) of the serving cell is below (0-7) or above (8-15) the threshold. This parameter is broadcast only on BCCH.

If the parameter value is 7, dual mode mobiles in idle state measure always neighbour UTRAN cell(s). If the parameter value is 15, dual mode mobiles in idle state do not measure any of the neighbour UTRAN cells.

GPRS-capable mobiles do not use this parameter if NCCR is active in the serving cell

QsearchP (A_BTS)

With this parameter you define the threshold for GPRS capable dual mode mobiles to search for and to measure UTRAN neighbour cells introduced in 3G Cell Reselection list when a running average of the received downlink signal level (RLA_C) of the serving cell is below (0-7) or above (8-15) the threshold.

This parameter is broadcast on BCCH.

In case this parameter is broadcast on BCCH it shall be used only if GPRS cell re-selection parameters for one or more cells are sent to the MS in a Packet Cell Change Order or Packet Measurement Order message

If the parameter value is 7, GPRS-capable multi-RAT MSs measure always neighbour UTRAN cell(s). If the parameter value is 15, GPRS-capable multi-RAT MSs do not measure any of neighbour UTRAN cells.

GPRS-capable mobiles use this parameter only if NCCR is active in the serving cell

fddQOffset (A_BTS)

With this parameter you define a UTRAN cell reselection offset for non-GPRS capable dual mode mobiles which are in the idle state.

The mobiles add the offset to the running average (RLA_C) of the received signal level of the serving GSM cell and non-serving GSM cells. After that the mobiles compare the measured RSCP values of UTRAN cells with signal levels of the GSM cells.

-32 db = minus infinity dB

range: -28..28 dB, step 4 dB

FDD_GPRS_Offset

FDDQmin (A_BTS)

This parameter defines a minimum Ec/Io threshold which must be exceeded before a non-GPRS capable dual mode mobile is allowed to make a reselection from the serving GSM cell to an adjacent WCDMA RAN cell that is using frequency division duplex (FDD) type access technology/mode

FDD_REP_QUANT

defines the reporting quantity for UTRAN cell

3G_Search_PRIO

Is used to inidicate to the MS if 3G cells can be looked for when BSIC decoding is required. (0=no, 1=yes, default: 1)

3G HO Basic reporting eventsIntra frequency events

1A: Primary CPICH enters the reporting range (Ncell addition), If active set of UE is full, UE stops reporting 1A event

1B: P-CPICH leaves the reporting range (Ncell deletion)

1C: Non-active P-CPICH becomes better than an active PCPICH

1D: Change of current best cell with new P-CPICH

1E : The measurement value of a primary pilot channel exceeds the absolute threshold

1F : The measurement value of a primary pilot channel is lower than the absolute threshold

Inter frequency events

2A : The best frequency changes

2B : The quality of the current cell frequency is lower than a certain threshold, but that of the non-used frequency is higher than a certain threshold

2C : The estimated quality of the non-used frequency is higher than a certain threshold

2D : The estimated quality of the used frequency is lower than a certain threshold

2E : The estimated quality of the non-used frequency is lower than a certain threshold

2F : The estimated quality of the used frequency is higher than a certain threshold

Inter system events

3A : The estimated quality value of the used UTRAN frequency is lower than a certain threshold, and that of the other system is higher than a certain threshold

3B : The estimated quality value of the other system is lower than a certain threshold

3C : The estimated quality value of the other system is higher than a certain threshold

3D : The best cell in the other system changes 

ADMISSION CONTROL

Admission control decides whether or not an incoming call can be accepted. A new radio connection is admitted by the CRNC which accounts for the available resources at the corresponding Node B. The allocation of resources includes the allocation of the corresponding downlink spreading and channelization code pair. The objective of admission control is to maintain call quality in each cell by limiting admission of radio bearers. If radio bearers were granted without limit, the interference level in the cell would increase, leading to degradation of the call quality. In addition to the admission control function in the RNC, the Node B performs admission control to protect the Node B against too high transmission power requirements. The Node B estimates the transmission power requirement of a new radio link and verifies whether the total transmission power is below the maximum allowable transmission power

Admission control memutuskan boleh atau tidak panggilan masuk dapat diterima.Koneksi radio baru diakui oleh CRNC yang menyumbang sumber daya yang tersedia padaNode B. sesuai Alokasi sumber daya termasuk alokasi downlink yang sesuai menyebardan pasangan channelization kode. Tujuan dari admission control adalah menjaga kualitas panggilan dalam sel masing-masing dengan membatasi pengakuan pembawa radio. Jikapembawa radio diberikan tanpa batas, tingkat gangguan pada sel akan meningkat,menyebabkan degradasi kualitas panggilan. Selain fungsi kontrol masuk di RNC, Node Bmelakukan admission control untuk melindungi terhadap Node B juga kebutuhan dayatransmisi yang tinggi. Node B memperkirakan kebutuhan transmisi daya dari radio linkbaru dan memverifikasi apakah daya transmisi total di bawah daya transmisi maksimum yang diijinkan

Lapisan RRC di UE meninggalkan modus idle dan memulai sebuah pembentukan koneksi RRC dengan mengirimkan pesan RRC Permintaan Koneksi menggunakan modus RLC transparan pada saluran CCCH logis. Ini logical channel akan dipetakan ke Rach transportasi saluran dengan MAC. Peta saluran Fisik Rach ini ke PRACH dan mengirimkan pesan ini ke jaringan. Ingat bahwa UE tidak dapat mengirim seperti pesan permintaan secara spontan melalui PRACH, karena PRACH ini akan digunakan oleh semua UES dalam sel. Jadi UE akan mendengarkan AICH saluran untuk mengetahui slot waktu yang ditetapkan untuk ini UE untuk menggunakan PRACH. (Untuk mengetahui lebih lanjut tentang ini klik di sini).

BTS adalah benar-benar transparan untuk pesan ini, karena tidak memiliki lapisan RRC.

Pada sisi jaringan, berdasarkan penerimaan Permintaan Koneksi RRC, lapisan RRC melakukan admission control, memberikan sebuah s-RNTI untuk sambungan RRC dan memilih parameter sumber daya radio (seperti jenis saluran transportasi, format transportasi set dll). Jika dch adalah untuk dibentuk, CPHY-RL-Setup dan primitif permintaan CPHY-TrCH-Config (ditransmisikan sebagai salah satu RADIO LINK SETUP PDU) yang dikirim ke semua Node B yang akan terlibat dalam pembentukan saluran. Operasi lapisan fisik dimulai dan primitif konfirmasi kembali dari masing-masing Node B. mengkonfigurasi parameter RRC pada lapisan 2 untuk membangun saluran logis DCCH lokal. Parameter yang dipilih termasuk RNTI,

ditransmisikan ke UE dalam pesan Connection Setup RRC menggunakan modus diakui pada saluran logis CCCH.

Setelah penerimaan pesan Pengaturan Koneksi RRC, lapisan RRC di UE mengkonfigurasi L1 dan L2 menggunakan parameter untuk lokal membangun saluran logis DCCH. Dalam kasus dch, lapisan 1 menunjukkan ke RRC ketika telah mencapai sinkronisasi.

Link sinyal RLC adalah lokal didirikan di kedua sisi. Pembentukan dapat dipetakan di kedua Rach / FACH atau dch oleh MAC. Ketika UE telah membentuk link sinyal RLC, itu mengirimkan pesan RRC Koneksi Pengaturan Lengkap untuk jaringan menggunakan modus mengakui pada DCCH tersebut.