8.5.13 Mapping of Access Classes to Access Service Classes

25.3313GPPProtocol specificationRadio Resource Control (RRC)Release 17TS

Tools: ARFCN - Frequency Conversion for 5G NR/LTE/UMTS/GSM

Access Classes shall only be applied at initial access, i.e. when sending an RRC CONNECTION REQUEST message. A mapping between Access Class (AC) and Access Service Class (ASC) shall be indicated by the information element "AC-to-ASC mapping" in System Information Block type 5 or System Information Block type 5bis. The correspondence between AC and ASC shall be indicated as follows.

AC	0 – 9	10	11	12	13	14	15
ASC	1^st IE	2^nd IE	3^rd IE	4^th IE	5^th IE	6^th IE	7^th IE

In the table, "n^th IE" designates an ASC number i in the range 0 – 7 to AC. If the ASC indicated by the "n^th IE" is undefined, the UE behaviour is unspecified.

For the random access and the Enhanced Uplink in CELL_FACH state and Idle mode, the parameters implied by the respective ASC shall be employed. In case the UE is member of several ACs it shall select the ASC for the highest AC number. In connected mode, AC shall not be applied.