1、 AMERICAN NATIONAL STANDARD FOR TELECOMMUNICATIONS ATIS-0700706.1997(R2008) Stage 1 Service Description for Personal Communications Service Enhanced Priority Access and Channel Assignment (PACA-E) Supplementary Service ATIS is the leading technical planning and standards development organization com
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11、aimer the top five levels (1 being the highest) are reserved for NS/EP users. Emergency (911/E911) call requests may be assigned a priority level in accordance with federal/state law. Coordination between PACA-E and emergency service shall be maintained to provide capabilities consistent with use of
12、 the services as mandated by law. 2 Normative reference The following standard contains provisions which, through reference in this text, constitute provisions of this American National Standard. At the time of publication, the edition indicated was valid. All standards are subject to revision, and
13、parties to agreements based on this American National Standard are encouraged to investigate the possibility of applying the most recent edition of the standard indicated below. ANSI T1.705-1995, Telecommunications Stage 1 service description for personal communications service Circuit-mode bearer s
14、ervices: Basic processes ATIS-0700706.1997 2 3 Definition 3.1 National Security and Emergency Preparedness (NS/EP): Executive Order (E.O.) 12472 directs the Office of the Manager, National Communications System (OMNCS) to assist in the planning for and provisioning of NS/EP communications for the Fe
15、deral Government under all circumstances, through the use of commercial, government, and privately owned telecommunication resources. These communities may be classified into national security leadership; national security posture and U.S. population warning; public health, safety, and maintenance o
16、f law and order; public welfare and maintenance of the national economic posture. 4 Service description The PACA-E service comprises two independent feature capabilities: (a) priority access for call origination from a PACA-E subscriber and (b) priority egress for call delivery to a PACA-E subscribe
17、r. Priority access and priority egress are considered independent of each other as this allows for subscription of priority access and priority egress separately or together. PACA-E is intended to support a hierarchy of priority service levels for access to radio channel resources. In this way, the
18、individual levels can be used to differentiate between various subcategories of priority users. PACA-E does not allow preemption of any existing calls or support more than one call in queue for any given PACA-E subscriber. Queued call attempts are normally serviced on the basis of priority levels fi
19、rst and time of arrival second. The case for contention of radio resources between priority incoming/outgoing call attempts is for further study. This standard does not require that radio resources be permanently “reserved” or “set aside” for PACA-E usage, rather, when a radio resource becomes avail
20、able, any PACA-E calls already in queue will be considered before any non-PACA-E calls. It is intended that commercial service will not be totally preempted by priority access calls. In order to maintain commercial service, an available channel may be assigned to a non-priority call rather than a PA
21、CA-E call in queue. 4.1 Priority access This feature enables a PACA-E (access) subscriber placing a call to obtain priority access to radio channel resources during PCS call setup using multilevel priority queuing of call setup attempts when radio resources are congested. Queued outbound calls are s
22、erviced on the basis of the PACA-E (access) subscribers individual priority level first and time of arrival second. The PACA-E subscribers service is marked busy for incoming calls while waiting in queue for a radio channel to be assigned. 4.2 Priority egress This feature enables a PACA-E (egress) s
23、ubscriber receiving a call to obtain priority access to radio channel resources during PCS call delivery through multilevel priority queuing of call delivery attempts when radio resources are congested. Queued inbound calls are serviced on the basis of the PACA-E (egress) subscribers individual prio
24、rity level first and time of arrival second. The PACA-E subscribers service is considered busy by the system for subsequent incoming calls while the PACA-E (egress) feature is invoked. ATIS-0700706.1997 3 5 Procedures The following subclauses describe PACA-E functionality (procedures and states), an
25、d their relationship to the procedures of the PCS Basic Call process. 5.1 Priority access (Outbound) 5.1.1 Provisioning/Withdrawal PACA-E priority access as described in this standard shall be available to those customers who have subscribed accordingly and whose subscription has been provisioned. W
26、ithdrawal is the complementary action taken when the user cancels his subscription to PACA-E priority access. 5.1.2 Activation/Deactivation Activation of PACA-E access enables the user to place a priority call via the invocation of the PACA-E functionality that has been added to a PCS Basic Call pro
27、cess. Deactivation is the complementary action that prevents the priority treatment of this users calls. 5.1.2.1 Demand activation When provisioned as a demand-activated service, PACA-E priority access is normally deactivated. It is activated when the user sends a PACA-E priority access service requ
28、est (e.g., via a feature code entered on the Radio Terminal Equipment) prior to placing or receiving a call. Deactivation occurs upon completion of a PACA-E call. 5.1.2.2 Permanent activation When provisioned as a permanently activated service, all outbound calls from the user will be treated as pri
29、ority calls. The user cannot deactivate it except by withdrawal or reprovisioning the service as demand activated. 5.1.3 Invocation/Operation Once PACA-E priority access is activated, it will be invoked by a Call Modification procedure in a PCS Basic Call process, either during call origination or c
30、all delivery (see figure A.1.1, figure A.1.2, and figure A.2 in annex A). At the time of call origination (access), the PACA-E priority access user shall receive an indication of the PACA-E queuing request status. The PACA-E priority access user may also receive periodic alerting while the call atte
31、mpt is in queue. PACA-E service is in operation as long as the call attempt remains in the queue. Upon a radio resource becoming available and assigned, the user will be alerted that the call attempt is in progress (e.g., via a distinctive tone) and the user is expected to stay on the line in order
32、to continue the PACA-E process. When a PACA-E priority access call attempt is invoked in a PCS system, it is processed by a modified PCS Basic Call process that will (a) process the call as usual if resources are available, (b) mark the call attempt as a priority call if PACA-E priority access was a
33、ctivated and resources are not available, (c) include a PACA-E queuing procedure, and (d) modify the radio resource assignment procedure to include the ability to determine if a resource should be assigned to a priority outgoing call attempt (see figure A.1.1, figure A.1.2, and figure A.2 in annex A
34、). If resources are not available and the call attempt is not a PACA-E call, processing continues as per the original PCS Basic Call process. If resources are not available and a call is marked as a priority call, a PACA-E queuing procedure is invoked before processing continues and the following sc
35、enarios apply: a) If the priority call attempts queue is not full, the call attempt is placed into the queue on the basis of its PACA-E priority level and time of arrival, and the PACA-E priority access subscriber receives an indication that the call attempt has been queued. While the call attempt i
36、s queued, the PACA-E priority access subscriber can abandon the call, the call can be bumped from the queue (e.g., by a higher ATIS-0700706.1997 4 priority call, upon queue time-out1)or loss of location), or the call can be served with a radio resource. Abandoning the call attempt causes the call to
37、 be dropped from the queue. Any other disposition of the queued call, other than call completion, causes an indication of call failure to be sent to the PACA-E priority access subscriber; b) If the queue is full but there is a call attempt in queue with lower priority, the PACA-E queuing procedure d
38、rops the lowest priority call attempt from the bottom of the queue and proceeds as if the queue was not full. If no lower priority call attempt is in the queue, time of arrival of the queued call attempts of the same priority is used to resolve the contention. If the priority call attempt has lower
39、priority and later time of arrival than the queued call attempts, it is treated as a normal PCS call according to the original PCS Basic Call process. In cases where there is a contention of available RF resources on the basis of call attempts having the same priority level, the time of arrival will
40、 normally be used. The details of the Queuing Resolution Process, including contention for radio resources between radio priority incoming/outgoing call attempts, are for further study. The PCS network shall track the location of the calling party since it may change after the call has been queued.
41、Without periodically updating the location of the calling party, the PCS system would not be able to determine if the user is in a location where a radio resource is available to complete the call. As shown in figure C.1 of annex C, a timer is used to control periodic location updating procedures. T
42、he calling party is located and the timer is started. Upon expiration of the timer, if the calling party cannot be located, then the call attempt is removed from the queue and the PACA-E access request is discarded; if the calling party can be located but no resource is available, then the location
43、is recorded, the paging timer is reset and restarted, and the call left in the queue. 5.2 Priority egress (Inbound) 5.2.1 Provisioning/Withdrawal PACA-E priority egress, as described in this standard, shall be available to those customers who have subscribed accordingly and whose subscription has be
44、en provisioned. Withdrawal is the complementary action taken when the user cancels his subscription to PACA-E priority egress. PACA-E, on egress, is normally provisioned as a demand-activated service, as described in 5.2.2.1. Optionally, it can be provisioned as a permanently activated service, as d
45、escribed in 5.2.2.2. 5.2.2 Activation/Deactivation Activation of PACA-E egress enables the user to receive a priority call via the invocation of the PACA-E functionality that has been added to a PCS Basic Call process. Deactivation is the complementary action that prevents the priority treatment of
46、this users calls. 5.2.2.1 Demand activation When provisioned as a demand-activated service, PACA-E priority egress is normally deactivated. It is activated when the user sends a PACA-E priority egress service request (e.g., via a feature code entered on the Radio Terminal Equipment) prior to placing
47、 or receiving a call. Deactivation occurs when the user sends a PACA-E priority egress deactivation request. 5.2.2.2 Permanent activation When provisioned as a permanently activated service, all inbound calls to the user will be treated as priority calls. The user cannot deactivate it except by with
48、drawal or reprovisioning the service as demand activated 1)It is desirable that an administrable timer be provisioned for the queue time-out. The minimum and maximum range of timer values, including timer/timers will be addressed in stage 2. ATIS-0700706.1997 5 5.2.3 Invocation/Operation Once PACA-E
49、 priority egress is activated, it will be invoked by a Call Modification procedure in a PCS Basic Call process, either during call origination or call delivery (see figure A.1.1, figure A.1.2, and figure A.2 in annex A). When a PACA-E priority egress call attempt is invoked in a PCS system, it is processed by a modified PCS Basic Call process that will (a) process the call as usual if resources are available, (b) mark the call attempt as a priority call if PACA-E priority egress was activated and resources are not available, (c) include a PACA-E queuing procedure, and (d) mo
