Hi Jack,
No meaning, it is a randm value.
3GPP 44.018
10.5.2.15 Handover Reference
The purpose of the Handover Reference information element is to provide a handover reference value used for access identification.
The Handover Reference information element is coded as shown in figure 10.5.2.15.1 and table 10.5.2.15.1.
The Handover Reference is a type 3 information element with 2 octets length.
Regards
pix