Two approaches to messaging services using PACS

Personal communications services (PCS) technologies proposed for the 1.9 GHz band provide messaging service capabilities. We discuss two approaches to messaging services using personal access communications systems (PACS). The first approach is based on IS-41 short message service. The second approach is a variant that uses Internet transport. Combined with a messaging protocol over the air interface that is simple to implement, PACS offers the flexibility to support both long and short messaging services. In addition, PACS supports different message forms that can be used to identify from alphanumeric to arbitrary binary messages.