Section: 8.21.3 RAI field
Content: The coding of RAI (Routing Area Identity) is depicted in Figure 8.21.3-1. Only zero or one RAI field shall be present in ULI IE. Figure 8.21.3-1: RAI field The Location Area Code (LAC) consists of 2 octets. Bit 8 of Octet c+3 is the most significant bit and bit 1 of Octet c+4 the least significant bit. The coding of the location area code is the responsibility of each administration. Coding using full hexadecimal representation (binary, not ASCII encoding) shall be used (see 3GPP TS 23.003[ Numbering, addressing and identification ]  [2]). The Routing Area Code (RAC) consists of 2 octets. Only Octet c+5 contains the RAC. Octet c+6 is coded as all 1's (11111111). The RAC is defined by the operator. Coding using full hexadecimal representation (binary, not ASCII encoding) shall be used (see 3GPP TS 23.003[ Numbering, addressing and identification ]  [2]).