Section: 8.132 Secondary RAT Usage Data Report
Content: Secondary RAT Usage Data Report IE is coded as depicted in Figure 8.132-1. Figure 8.132-1: Secondary RAT Usage Data Report The following bits within Octet 5 shall indicate: - Bit 8 to 4 – Spare, for future use and set to zero. - Bit 3 – SRUDN (Secondary RAT Usage Data Report From NG-RAN): This bit indicates the presence of Length of Secondary RAT Data Usage Report Transfer and Secondary RAT Data Usage Report Transfer fields. If it is set to "1", the Length of Secondary RAT Data Usage Report Transfer and Secondary RAT Data Usage Report Transfer field shall be present, and the IRPGW bit shall be set to "1", octet 8 to 31 shall be set to "0"; otherwise, if it is set to "0", the Length of Secondary RAT Data Usage Report Transfer and Secondary RAT Data Usage Report Transfer field shall not be present. - Bit 2 – IRSGW (Intended Receiver SGW): This bit defines if the Usage Data Report shall be used by the SGW or not. If set to 1 the SGW shall store it. If set to zero the SGW shall not store it. - Bit 1 – IRPGW (Intended Receiver PGW): This bit defines if the Usage Data Report shall be sent to the PGW or not. If set to 1 the SGW shall forward it to PGW and PGW shall store it. If set to zero SGW shall not forward it to PGW. Octet 6 represents Secondary RAT Type Secondary RAT Type is coded as depicted in Table 8.132-1. Table 8.132-1: Secondary RAT Type values The EBI field in octet 7 shall contain the value indicating the EPS Bearer ID. The EBI field shall be encoded as the EBI field in the EPS Bearer ID (EBI) IE type (see clause 8.8). Octets 8 to 11 and 12 to 15 shall be encoded in the same format as the first four octets of the 64-bit timestamp format as defined in clause 6 of IETF RFC 5905 [53]. It indicates the UTC time when the recording of the Secondary RAT Usage Data was started and ended. NOTE: The encoding is defined as the time in seconds relative to 00:00:00 on 1 January 1900. Octets 16 to 23 and 24 to 31: The Usage Data UL/DL fields are encoded as octets in binary value. The range of Usage Data UL and Usage Data DL are specified in 3GPP TS 36.413[ Evolved Universal Terrestrial Radio Access Network (E-UTRAN); S1 Application Protocol (S1AP) ]  [10]. Editors Note: The format and range is subject to be aligned with RAN specification. The timestamp and Usage Data UL and DL are received from relevant S1 messages. The Secondary RAT Data Usage Report Transfer field shall be encoded with the transparent copy of NGAP IE Secondary RAT Data Usage Report Transfer as specified in 3GPP TS 38.413[ NG-RAN; NG Application Protocol (NGAP) ]  [84]. (See also Annex B.3)