1. 1 Title: Special Access Class Abstract: This contribution presents an approach to support the special access terminal class. Recommendation: Review and Adopt Source:

2. 2 Background  Access Channel Overload Control 1x Access Overload Control ACCOLC(0-9) is used to identify the overload class for regular mobile stations and redirect them in global service redirection message ACCOLC(10) is defined for test mobile stations ACCOLC(11) is defined for emergency mobile stations ACCOLC(12) is proposed as a special access class for National Security/Emergency Preparedness mobile stations(C20-20100913-016) HRPD Access Overload Control Access terminal based access overload control Four APersistences for different classes in the AccessParameters The default value of access terminal class is 0 The access terminal’s class(2) is reserved for a test access terminal. The access terminal’s class configuration is beyond the C.S0024 Profiled based access terminal’s class Per call based access overload control PageResponseAPersistence EmergencyAPersistence

3. 3 Suggestion  Option 1 Use the reserved access class value for the authorized National Security/Emergency Preparedness access terminal The NS/EP access terminal’ class value = 3 The NS/EP access terminal should use APersistence[3] in AccessParameters to perform a persistence test Modify the mapping, table between ACCOLC and Apersistence[i] in C.S0016_D APersistence[2] maps to ACCOLC[13] APersistence[3] maps to ACCOLC[12,14,15]  Option 2 Define a special profile/attribute of access terminal’s class in the access channel configuration attribute for the authorized NS/EP access terminal NS/EPAPersistence(0xf?) 0x00~0x3e: The access terminal shall use 2-n/4 as the persistence probability Ox3f: The access terminal shall use zero as the persistence probability(default) NS/EPAPersistence shall override any other AT based persistences

4. 4 Suggestion  Option 3 Define a new access persistence value for the authorized National Security/Emergency Preparedness access terminal The new-added persistence value has no relationship with APersistence[i] and is independent of the mapping table in C.S0016_D Notes: Telcordia had one concern that Rev.A AT that support NS/EP needs to have the function to skip all Access Parameters message fields that are defined in Rev.B/C

5. 5 Comparison of addressing ways for three options ProCon Option 1Use the reserved access class value(3) for the authorized National Security/Emergency Preparedness access terminal This is the simplest way for HRPD terminal to support NS/EP function As referred by HIT, operators using AccessTerminalClassOverride function may have already assigned specific meanings to Access Terminal Class 1 and 3. Then, if the definition of Access Terminal Class is changed, there may be an backward compatibility issue. This option also has limited expansibility Option 2Define a special profile/attribute of access terminal’s class in the access channel configuration attribute for the authorized NS/EP access terminal Defining new attribute would avoid backward compatibility issue. This solution could meet Telcordia’s requirement through the way that Rev.A AT only supports the new- added configuration attribute. Such parameters are normally constant. Not only initial configuration between all ATs and AN but also re-configuration initiate d by AN after the parameters are changed will bring unnecessary system burden. Option 3Attach new-added access persistence value for NS/EP access terminal to the current AccessParameters Message Defining new-added access persistence value would also avoid backward compatibility issue. Making use of the current AccessParameters message is simple. This solution could not meet Telcordia’s requirement. Define a new overhead message to include new-added access persistence value for NS/EP access terminal This solution could meet Telcordia’s requirement through the way that Rev.A AT only supports the new overhead message. There is little complexity about adding new overhead message. However, we could make the processing of new- added message aligned with that of AccessParameters