Method for Improving Paging Speed of a Called User in Cdma Trunking System

• US 20080317144A1
• Filed: 12/26/2005
• Published: 12/25/2008
• Est. Priority Date: 12/26/2005
• Status: Active Grant

• Current Assignee: Yarnton Technologies LLC
• Original Assignee: ZTE Corporation
• Inventors: Huang, Chi, Ding, Mengjiao, Liu, Jinlong
• Granted Patent: US 8,050,692 B2
• Time in Patent Office: Days
• US Class Current: 375/260
• CPC Class Codes: H04W 4/10 Push-to-Talk [PTT] or Push-On-Call services
• CPC Class Codes: H04W 68/02 Arrangements for increasing efficiency of notification or paging channel
• CPC Class Codes: H04W 76/45 for Push-to-Talk [PTT] or Push-to-Talk over cellular [PoC] services

Abstract

The present invention discloses a method for improving paging speed of a called user in CDMA trunking system. For a first trunking terminal supporting minus time slot call manner, said method includes: it makes minus time slot paging cycles of the first trunking terminal and a trunking core network keep synchronous; the first trunking terminal selects a minus time slot paging cycle to calculate a paging time slot according to the presence of its own minus time slot paging cycle and the presence of a minus time slot paging cycle contained in an overhead message of a call channel, and monitors the call channel on the calculated paging time slot; the base station system selects a minus time slot paging cycle to calculate a paging time slot of the user according to the presence of its own minus time slot paging cycle and the presence of a minus time slot paging cycle contained in a paging request message, and transmits a paging message on the call channel according to the calculated paging time slot. The method of the present invention effectively shortens the duration of establishment of a trunking call, and simultaneously maintains the compatibility for the existing trunking terminals.

Claims

1. A method for improving paging speed of a called user in a code division multiple access trunking system characterized in that, for a first trunking terminal supporting minus time slot paging manner, comprises the following steps:

a minus time slot paging cycle synchronizing step, in which it makes minus time slot paging cycles saved by the trunking terminal and a trunking core network keep synchronous;

a system paging channel monitoring step, in which the trunking terminal decides a time slot paging cycle to calculate a paging time slot according to the presence of its own minus time slot paging cycle and the presence of a minus time slot paging cycle contained in an overhead message of a call channel, and monitors the paging channel on the calculated paging time slot; and

a user paging step, in which the base station system selects a time slot paging cycle to calculate a paging time slot of the user according to the presence of its own minus time slot paging cycle and the presence of a minus time slot paging cycle contained in a paging message, and transmits a paging message on the paging channel according to the calculated paging time slot.

2. The method according to claim 1, wherein, in the minus time slot paging cycle synchronizing step, a trunking core network apparatus performs the paging in accordance with paging information before the synchronization when a trunking call is performed in the case of a failure of the synchronization.

3. The method according to claim 2, wherein, the minus time slot paging cycle synchronizing step specifically comprises the following steps:

a step denominated Step 11 in which the trunking system core network initiates the synchronization of minus time slot paging cycle with the trunking terminal;

a step denominated Step 12 in which the trunking core network apparatus sends minus time slot information to the trunking terminal via an air interface, the trunking terminal saves related information and simultaneously sets its own minus time slot information to be effective, and sends a recognizing message to the trunking network apparatus;

a step denominated Step 13 in which the trunking core network apparatus judges whether the recognizing message of successful synchronization update is received, the flow is ended in the case of a successful update, and the flow turns to Step 14 for processing in the case of an unsuccessful update; and

a step denominated Step 14 in which the trunking core network apparatus sets an update-failed flag bit, if a trunking call is performed, the trunking core network apparatus performs the paging in accordance with the paging information before the synchronization when paging the first trunking terminal.

4. The method according to claim 3, wherein, in the Step 11, the trunking core network apparatus initiates a synchronization update flow of minus time slot paging cycle information with the trunking terminal when the trunking system core network accepts user registration this time in the case where the trunking system core network adds time slot paging cycle information for the user, the minus time slot cycle information varies, or the previous synchronization with the first trunking terminal is unsuccessful.

5. The method according to claim 1, characterized in that, in the system paging message monitoring step, when both the minus time slot paging cycle saved by the first trunking terminal and the minus time slot paging cycle contained in the overhead message of the paging channel are present, the first trunking terminal calculates the paging time slot with the smaller value there-from;

when only one of the minus time slot paging cycle saved by the first trunking terminal and the minus time slot paging cycle contained in the overhead message of the call channel is present, the trunking terminal calculates the paging time slot with the minus time slot paging cycle which is present;

when neither a minus time slot paging cycle is saved by the trunking terminal nor a minus time slot paging cycle is contained in the overhead message of the call channel, the first trunking terminal calculates the paging time slot in accordance with IS2000 protocol.

6. The method according to claim 5, wherein, the system paging message monitoring step specifically comprises the following steps:

a step denominated Step 21, in which the trunking terminal monitors the paging channel and receives the overhead message from paging channel after being on startup and having acquired pilot channel and synchronization channel;

a step denominated Step 22, in which the trunking terminal judges whether information containing minus time slot is acquirable on the paging channel, and it turns to Step 23 for processing in the case of acquirable, else, turns to Step 24 for processing;

a step denominated Step 23, in which the trunking terminal judges whether itself has saved the minus time slot information synchronized from the trunking core network apparatus, and it turns to Step 25 for processing in the case of having saved, else, turns to Step 26 for processing;

a step denominated Step 24, in which the trunking terminal judges whether itself has saved the minus time slot information synchronized from the trunking core network apparatus, and it turns to Step 27 for processing in the case of having saved, else, calculates the paging time slot in accordance with IS2000 protocol, and it turns to Step 28 for processing;

a step denominated Step 25, in which the trunking terminal calculates a paging time slot with the smaller value of the minus time slot paging cycle saved by itself and the time slot paging cycle contained in the overhead message, and it turns to Step 28 for processing;

a step denominated Step 26, in which the trunking terminal calculates the paging time slot with the minus time slot paging cycle contained in the overhead message, and it turns to Step 28 for processing;

a step denominated Step 27, in which the trunking terminal calculates a paging time slot with the minus time slot paging cycle saved by itself, and it turns to Step 28 for processing; and

a step denominated Step 28, in which the trunking terminal waits for being woke up by a message on the paging channel based on the calculated paging time slot.

7. The method according to claim 1 wherein, in the user paging step, the base station system calculates the paging time slot of the user with the smaller value of the minus time slot paging cycle allocated by itself and the minus time slot cycle contained in the paging request message when the paging message contains the minus time slot cycle information;

the base station system calculates the paging time slot of the user with the minus time slot paging cycle allocated by itself when the paging message does not contain the minus time slot cycle information.

8. The method according to claim 7, wherein, the user paging step specifically comprises the following steps:

a step denominated Step 31, in which the base station system receives the paging message sent from the trunking core network apparatus and starts a paging processing flow;

a step denominated Step 32, in which the base station system judges whether the paging message contains information informing that the trunking terminal supports minus time slot, and it turns to Step 33 for processing in the case of containing, else, turns to Step 34 for processing;

a step denominated Step 33, in which the base station system calculates the paging time slot with the smaller value of the minus time slot paging cycle contained in the paging request message and the time slot paging cycle of the base station itself, and it turns to Step 35;

a step denominated Step 34, in which the base station system calculates the paging time slot with its own minus time slot paging cycle, and it turns to Step 35; and

a step denominated Step 35, in which the base station system sends the paging message on the paging channel in accordance with the calculated paging time slot.

9. The method according to claims 1, wherein, in the minus time slot paging cycle synchronizing step, the flow of the minus time slot paging cycle synchronizing step is directly ended in the case where it is judged that the trunking terminal does not support the minus time slot paging manner;

and in the system paging message monitoring step and the user paging step, the monitoring of the message on the paging channel and the paging for a second trunking terminal are respectively performed in the manner as stipulated under IS2000 protocol.

10. The method according to claim 9, characterized in that, it is judged based on protocol version number of trunking terminal, whether the trunking terminal supports the minus time slot paging manner.

11. The method according to claim 3 wherein, in the user paging step, the base station system calculates the paging time slot of the user with the smaller value of the minus time slot paging cycle allocated by itself and the minus time slot cycle contained in the paging request message when the paging message contains the minus time slot cycle information;

the base station system calculates the paging time slot of the user with the minus time slot paging cycle allocated by itself when the paging message does not contain the minus time slot cycle information.

12. The method according to claim 5 wherein, in the user paging step, the base station system calculates the paging time slot of the user with the smaller value of the minus time slot paging cycle allocated by itself and the minus time slot cycle contained in the paging request message when the paging message contains the minus time slot cycle information;

the base station system calculates the paging time slot of the user with the minus time slot paging cycle allocated by itself when the paging message does not contain the minus time slot cycle information.

13. The method according to claim 6 wherein, in the user paging step, the base station system calculates the paging time slot of the user with the smaller value of the minus time slot paging cycle allocated by itself and the minus time slot cycle contained in the paging request message when the paging message contains the minus time slot cycle information;

the base station system calculates the paging time slot of the user with the minus time slot paging cycle allocated by itself when the paging message does not contain the minus time slot cycle information.

14. The method according to claim 11, wherein, the user paging step specifically comprises the following steps:

a step denominated Step 31, in which the base station system receives the paging message sent from the trunking core network apparatus and starts a paging processing flow;

a step denominated Step 32, in which the base station system judges whether the paging message contains information informing that the trunking terminal supports minus time slot, and it turns to Step 33 for processing in the case of containing, else, turns to Step 34 for processing;

a step denominated Step 33, in which the base station system calculates the paging time slot with the smaller value of the minus time slot paging cycle contained in the paging request message and the time slot paging cycle of the base station itself, and it turns to Step 35;

a step denominated Step 34, in which the base station system calculates the paging time slot with its own minus time slot paging cycle, and it turns to Step 35;

a step denominated Step 35, in which the base station system sends the paging message on the paging channel in accordance with the calculated paging time slot.

15. A method for improving paging speed of a called user in a code division multiple access trunking system for a first trunking terminal supporting minus time slot paging manner, comprising the following steps:

a minus time slot paging cycle synchronizing step, in which minus time slot paging cycles made are saved by the first trunking terminal and a trunking core network keeps said cycles synchronous;

a system paging channel monitoring step, in which the first trunking terminal decides a time slot paging cycle to calculate a paging time slot according to the presence of a minus time slot paging cycle of the first trunking terminal and to the presence of a minus time slot paging cycle contained in an overhead message of a call channel, and monitors the paging channel on the calculated paging time slot; and

a user paging step, in which a base station system selects a time slot paging cycle to calculate a paging time slot of a user according to the presence of a minus time slot paging cycle of the base station system and to the presence of a minus time slot paging cycle contained in a paging message, and transmits a paging message on the paging channel according to the calculated paging time slot.