B.2 GAN Iu mode UARFCN/PSC for handover-to-GAN

3GPP43.318Generic Access Network (GAN)Release 17Stage 2TS

Selection of the UTRA Absolute RF Channel Number (UARFCN) and Primary Scrambling Code (PSC) may use the following guidelines:

1. The GAN UARFCN may be allocated from the operator’s existing UARFCN pool.

2. The GAN UARFCN should be the same as the macro network UARFCN value of the current serving UTRAN cell for the MS, to avoid the need to require the MS to do inter-frequency measurements for UTRAN-to-GAN handover purposes (e.g., requiring that the MS operate in compressed mode). The GANC may use the downlink UARFCN of the UTRAN cells in the current active set, received from the MS in the GA-RC REGISTER REQUEST message, when deciding which UARFCN to return to the MS in the GA-RC REGISTER ACCEPT message. Note that all UTRAN cells in the current active set use the same downlink UARFCN.

3. The GAN PSC may be desired to be the same unique number across the whole operator network to minimize the RNS configuration effort.

B.2.1 Cell Measurement Quantities and Values

As described in clause 9.14.2 (CS case) and clause 9.23.2 (PS case), handover from UTRAN to GAN Iu mode requires that the MS include information corresponding to the registered GAN Iu mode cell in the Measurement Report message sent to the RNC. The MS reports the "highest signal quality" for the GAN Iu mode cell. This is not the actual measured signal level on the GAN, rather an artificial value allowing the MS to indicate preference for the GAN.

The RNC may request that the MS report either the downlink Ec/No (received energy per chip divided by the noise power spectral density in the band) or downlink RSCP (Received Signal Code Power) quantities. The MS shall report maximum values for the Ec/No or RSCP quantities. The maximum value of Ec/No is 63. The maximum value of RSCP is 91.

Annex C (informative):
Identifiers in GAN