Each GSM cell broadcasts information about:
• Neighboring cells (WCDMA and LTE)
• Thresholds for IRAT
• Priority between GSM, WCDMA and LTE cells
The information is broadcasted in the GSM network via the system
information message SI2quater.
The main purpose with priority based cell reselection is to allow
reselection to LTE, but at the same time it also introduces cell reselection
based on priority towards WCDMA. This is an alternative to the existing non
priority based cell reselection to WCDMA. When cell reselection to LTE is used,
cell reselection to WCDMA will be priority based as well. In MSs not supporting
priority based cell reselection, the non-priority based cell reselection to
WCDMA is used if the feature "GSM-UMTS Cell Reselection and Handover"
is activated.
Commands and Printouts
• RLSRI: Radio Control Cell, System Information RAT Priority, Initiate
- This new command is used to inform that priority based cell reselection shall
be used.
• RLSRC: Radio
Control Cell, System Information RAT Priority Data, Change - This new command
have three formats, one each for GSM, WCDMA and LTE. The purpose with the commands
are to configure different priorities between GSM, WCDMA and LTE in the cells.
• RLSRE: Radio Control Cell, System Information RAT Priority, End - This
new command is used to inform that priority based cell reselection shall be
deactivated.
• RLSRP: Radio Control Cell, System Information RAT Priority Data,
Print This new command prints the state of the priority based cell reselection.
• RLSEI: Radio Control Cell, System Information E-UTRAN Restriction,
Initiate - This new command is used to black list individual E-UTRAN (LTE)
cells for cell reselection per LTE frequency in each GSM cell.
• RLSEC: Radio Control Cell, System Information E-UTRAN Restriction,
Change - This new command is used to black list specific LTE cell groups for
cell reselection per LTE frequency in each GSM cell.
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