2section (Continued) 6 Layer 3 Processing

2.6.9.1.1 Definition

User Zones are associated with a set of features and services, plus a geographic area in which the User Zone features/services are made available to the customers that have subscribed to that User Zone. The boundary of the User Zone Geographic area may be established based on the coverage area of a public or private base station or it may be established independent of RF topology.

User Zones may be supported by the public system on the same frequency as the serving base station, or they may be supported on a private system operating on a different frequency.

2.6.9.1.2 Types of User Zones

• Broadcast User Zones: Broadcast User Zones are identified to the mobile station using the Paging Channel or the Primary Broadcast Control Channel. In this case, the base station broadcasts on the Paging Channel or the Primary Broadcast Control Channel messages identifying the User Zones that fall within the coverage area of the particular cell/sector. Mobile stations, as part of their monitoring of the Paging Channel or the Primary Broadcast Control Channel, will identify the presence of a particular User Zone.

• Mobile Specific User Zones: Mobile Specific User Zones are not broadcast by the base station. The mobile station may use other overhead message parameters and compare them with internally stored User Zone parameters to identify the presence of a particular User Zone. These parameters may include: SID, NID, BASE_ID, BASE_LAT, and BASE_LONG.

Broadcast User Zones allow for permanent as well as temporary subscription. Temporary subscription provides User Zone features and capabilities to users who are not subscribed to the User Zone. In this case, a mobile station, upon entering a new coverage area, may detect the presence of a User Zone that it presently does not subscribe to, but one that supports temporary subscription. The mobile station then queries the network to obtain the User Zone parameters. Once these parameters are received, the mobile station offers to the user via the mobile station user interface, the option of subscribing to the particular User Zone.

Some User Zones may require active registration (Active User Zones) upon the mobile station’s entry to immediately trigger a change in a feature(s). For others, the implicit registration at call setup is sufficient (Passive User Zones). Active User Zones are used where inbound features change as a result of being in the User Zone. During the Mobile Station Idle State, a mobile stations needs to register to update the User Zone ID whenever the User Zone that the mobile station is entering and/or leaving is of the Active type.

A mobile station that supports User Zone services may store a list of User Zones, where each User Zone is identified by a User Zone ID (UZID). Associated with each stored User Zone, the mobile station may also store a number of determinant parameters used for identifying User Zones.

2.6.9.2 Requirements

If the mobile station selects a User Zone supported by the base station, the mobile station shall set UZID_s to the User Zone Identifier associated with the User Zone; otherwise, the mobile station shall set UZID_s to ‘0000000000000000’. The precise process for determining how to select a User Zone that is supported by the base station is left to the mobile station manufacturer.

If the mobile station does not support User Zone services, the mobile station shall set UZID_s to ‘0000000000000000’.

The mobile station may search pilots of private neighbor base stations on other frequencies and band classes as identified in the Private Neighbor List Message. Search performance criteria are defined [11].

2.6.9.2.1 User Zone Operation in the Mobile Station Idle State:

When a mobile station performs an idle handoff, it selects User Zones based on internally stored parameters and information broadcast on the Paging Channel or on the Primary Broadcast Control Channel as described in 2.6.9.1.

After the mobile station performs idle handoff, if the mobile station determines that a change from one Broadcast User Zone to another Broadcast User Zone is required, the mobile station shall not update UZID_s, UZ_EXIT_IN_USE_s and shall not perform User Zone registration until the pilot strength of the currently serving base station exceeds that of the base station corresponding to the old User Zone by the value of UZ_EXIT_IN_USE_s.

If the mobile station determines that it needs to change User Zone, and if the difference between the pilot strengths exceeds UZ_EXIT_IN_USE_s, then the mobile station shall perform the following:

• Perform User Zone registration.

• Update UZID_s.

• Set UZ_EXIT_IN_USE_s to UZ_EXIT_RCVD_s.

The mobile station may also implement other means to avoid the premature exiting of a User Zone due to rapid changes in signal strength. The exact implementation of such techniques is left to mobile station implementation.

If the mobile station is in the Mobile Station Idle State and it receives a User Zone Reject Message the mobile station shall perform the following:

• Set REJECT_ACTION_INDI_s to REJECT_ACTION_INDI_r.

• If UZID_ASSIGN_INCL_r = ‘0’, the mobile station shall set UZID_s to ‘0000000000000000’, otherwise; the mobile station shall set UZID_s to ASSIGN_UZID_r.

If the mobile station is in the Mobile Station Idle State and it selects an active User Zone, then the mobile station shall perform User Zone registration (see 2.6.5.1.10) by entering the System Access State with a registration indication.

The mobile station should provide the user with a User Zone indication corresponding to the User Zone in service each time UZID_s is updated.

2.6.9.2.2 User Zone Operation in the Mobile Station Control on the Traffic Channel State

If the mobile station is in the Traffic Channel Substate of the Mobile Station Control on the Traffic Channel State and if it determines that the User Zone has changed, it shall update UZID_s and send a User Zone Update Request Message to the base station.

If the mobile station is in the Traffic Channel Substate or Release Substate of the Mobile Station Control on the Traffic Channel State and it receives a User Zone Update Message, then the mobile station shall update UZID_s and set it equal to UZID_r.

If the mobile station is in the Traffic Channel Substate or Release Substate of the Mobile Station Control on the Traffic Channel State and it receives a User Zone Reject Message, then the mobile station shall perform the following:

• Set REJECT_ACTION_INDI_s to REJECT_ACTION_INDI_r.

• If UZID_ASSIGN_INCL_r = 0, the mobile station shall set UZID_s to ‘0’, otherwise; the mobile station shall set UZID_s to ASSIGN_UZID_r.

The mobile station should provide the user with a User Zone indication corresponding to the User Zone in service each time UZID_s is updated.

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