Method and system for migrating registered base station based on digital trunking terminal

Abstract

The invention discloses a method and system for migrating a registered base station based on a digital trunking terminal, and the method comprises the steps: constructing a public broadcast signaling carrying a time slot count CSC through a PDT base station, enabling the time slot count CSC to correspond to a to-be-migrated target PDT terminal address, and enabling the to-be-migrated target PDT terminal address to be migrated when the time slot count CSC corresponding to the to-be-migrated target PDT terminal address is reached based on periodic time slot count. The public broadcast signaling and the migration signaling are issued at the same time, the downlink protocol signaling space is not occupied, and the situation that the PDT terminal cannot receive the signaling due to operation of other services can be avoided through periodic issuing; receiving the public broadcast signaling and the migration signaling through the PDT terminal, comparing the local address with the time slot count CSC in the public broadcast signaling, and migrating the PDT terminal out of the registered PDT base station when the local address is matched with the time slot count CSC in the public broadcast signaling; therefore, the migration signaling is periodically issued based on time slot counting, and meanwhile, a large number of terminals can issue the migration signaling and efficiently migrate out of the base station by using the terminal air interface addresses.

Description

Technical Field

[0001] The invention belongs to the technical field of digital communications, and in particular relates to a method and system for migrating and registering a base station based on a digital cluster terminal. Background Art

[0002] PDT (Police Digital Trunking) is a time-division communication protocol. When a PDT-based system is used to ensure communication during large-scale events, some base stations may have too many registered terminals, resulting in insufficient channel resources and affecting the scheduling of key tasks. In order to reduce the load of this base station, some terminals need to be notified to migrate out of this base station. In the existing technology, the target terminal can be notified to migrate out of this base station by continuously sending standard C_MOVE (PDT standard change control channel signaling). However, according to the definition of signaling, only one terminal address can be carried at a time. When a large number of terminals need to be migrated, the base station needs to send multiple migration signalings continuously, which will cause congestion in the base station downlink channel. In addition, the migration signaling is sent once. When the terminal is performing other services, it may not be able to receive the signaling of the main control channel, resulting in the loss of signaling and failure to migrate. Summary of the invention

[0003] In order to solve the shortcomings of the prior art, realize the stable and reliable migration of digital trunking terminals to their registered base stations, and reduce the service load of base stations, the present invention adopts the following technical solutions: A method for registering a base station based on digital cluster terminal migration is applied to the base station side, a public broadcast signaling carrying a time slot count CSC is constructed, and the time slot count CSC is made to correspond to the address of a target PDT terminal to be migrated. Based on periodic time slot counting, when the time slot count CSC corresponding to the address of the target PDT terminal to be migrated is reached, the public broadcast signaling and the migration signaling are sent simultaneously. The public broadcast channel signaling is sent in each time slot, does not occupy the downlink protocol signaling space, and is sent periodically, which can avoid the situation that the PDT terminal cannot receive the signaling due to running other services, so that the receiving target PDT terminal compares its address with the time slot count CSC, and migrates the terminal out of the base station when a match is found.

[0004] Furthermore, the time slot count CSC carried corresponds to the lower 9-bit short individual call address code SSI of the air interface number of the target PDT terminal to be migrated. When the migration signaling is sent down, for the same lower 9-bit short individual call address code SSI of the addresses of multiple target PDT terminals to be migrated corresponding to the time slot count CSC, the migration signaling only carries the upper 6-bit short individual call address code SSI of the air interface number of the target PDT terminal to be migrated, so that the migration signaling can carry more target PDT terminal address information at one time. At the same time, since the upper 6 bits are different and the number of bits is less than the lower 9-bit short individual call address code SSI, the number of bits carried during the transmission of the migration signaling is reduced, or it is used to increase the address information of the target PDT terminal to be migrated, so that the receiving target PDT terminal compares its short individual call address code SSI with the time slot count CSC and the upper 6-bit short individual call address code SSI in the migration signaling, and migrates the terminal out of the base station when a match is found.

[0005] Furthermore, the air interface number also includes a network-wide area identification code NAI. The network-wide area identification code NAI of the target PDT terminal in the unit area is the same and is known internally in the terminal. It does not need to be carried in the migration signaling. By sending the migration signaling, the receiving target PDT terminal restores the received terminal address based on the network-wide area identification code NAI and the short individual call address code SSI carried in the migration signaling. If the restored terminal address is the same as the received target PDT terminal address, the receiving target PDT terminal is moved out of the current base station.

[0006] Furthermore, the target PDT terminal address to be migrated is placed in the same migration terminal list and waits for polling to be sent. If the target terminal address is more than the migration signaling capacity sent by the word, it can wait until the next cyclic polling to be sent. The migration signaling carries the effective migration duration. When the effective migration duration is exceeded, the periodic migration signaling is canceled and the migration terminal list is cleared.

[0007] Furthermore, the time slot count CSC is counted and accumulated every N time slots, and counted periodically. A common broadcast channel CACH signaling carrying the time slot count CSC is sent down in each time slot, which does not occupy the downlink protocol signaling space. N common broadcast channels CACH constitute a complete time slot count CSC information.

[0008] A method for terminal migration based on digital cluster is applied to the terminal side to obtain the public broadcast signaling and migration signaling sent simultaneously, wherein the time slot count CSC carried in the public broadcast signaling corresponds to the address of the target PDT terminal to be migrated, and the received migration signaling is sent when the time slot count CSC reaches the address of the target PDT terminal to be migrated during the periodic time slot counting process, and the local address is compared with the time slot count CSC in the migration signaling, and the target PDT terminal is migrated when they match, and the public broadcast channel signaling is sent in each time slot, does not occupy the downlink protocol signaling space, and is sent periodically, which can avoid the situation that the PDT terminal cannot receive the signaling due to running other services.

[0009] Furthermore, the received timeslot count CSC corresponds to the lower 9-bit short individual call address code SSI of the air interface number of the target PDT terminal to be migrated; the received migration signaling corresponds to the same lower 9-bit short individual call address code SSI of the addresses of multiple target PDT terminals to be migrated for the timeslot count CSC, and only carries the upper 6-bit short individual call address code SSI of the air interface number of the target PDT terminal to be migrated, so that the migration signaling can carry more target PDT terminal address information at one time. At the same time, since the upper 6 bits are different and the number of bits is less than the lower 9-bit short individual call address code SSI, the number of bits carried during the migration signaling transmission is reduced, or it is used to increase the address information of the target PDT terminal to be migrated, and the local short individual call address code SSI is compared with the received timeslot count CSC and the upper 6-bit short individual call address code SSI, and the target PDT terminal is migrated when a match is found.

[0010] Furthermore, the air interface number also includes a network-wide area identification code NAI. The network-wide area identification code NAI of the target PDT terminal in the unit area is the same and is known inside the terminal. It does not need to be carried in the migration signaling. Based on the network-wide area identification code NAI and the short individual call address code SSI carried in the received migration signaling, the target PDT terminal address is restored. If the restored target PDT terminal address is the same as the local address, the target PDT terminal is migrated.

[0011] Furthermore, during the matching, the registered current PDT base station channel number is added to the migration base station blacklist, and the new PDT base station is re-scanned and registered offline. For the PDT base station scanned in the blacklist, no registration is initiated; the received migration signaling carries the effective migration duration. When the effective migration duration is exceeded, the migration base station is removed from the blacklist.

[0012] A system based on digital cluster terminal migration registration base station, comprising a PDT base station and a PDT terminal registered in the PDT base station; The PDT base station constructs a public broadcast signaling carrying a time slot count CSC, and makes the time slot count CSC correspond to the address of the target PDT terminal to be migrated. Based on the periodic time slot count, when the time slot count CSC corresponding to the address of the target PDT terminal to be migrated is reached, the public broadcast signaling and the migration signaling are sent at the same time. The public broadcast channel signaling is sent in each time slot, does not occupy the downlink protocol signaling space, and is sent periodically, which can avoid the situation where the PDT terminal cannot receive the signaling due to running other services; The PDT terminal receives the migration signaling and compares its local address with the time slot count CSC in the migration signaling. When a match is found, the PDT terminal is migrated out of the registered PDT base station.

[0013] The advantages and beneficial effects of the present invention are: The present invention discloses a method and system for migrating and registering a base station based on a digital cluster terminal. Under a PDT cluster base station, based on the composition of a 24-bit terminal air interface number, a CSC counting broadcast issued by a base station is used to implement periodic issuance of migration signaling, so as to stably and reliably complete the terminal migration and registration of the base station. By adding a migration broadcast signaling that carries migration parameters and part of the terminal air interface address, migration signaling is issued to a large number of terminals, so that the target terminal can migrate out of the base station within a certain period of time, thereby achieving the effect of reducing the service load of the base station. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of cluster terminal migration miss caused by using standard C_MOVE signaling in an embodiment of the present invention.

[0015] Figure 2 This is a flow chart of a PDT cluster base station periodically sending migration signaling in a counting time slot in an embodiment of the present invention.

[0016] Figure 3 It is a schematic diagram of the structure of a common broadcast channel CACH of a PDT cluster base station in an embodiment of the present invention.

[0017] Figure 4 It is a schematic diagram of the complete time slot count CSC information structure composed of 4 CACHs in an embodiment of the present invention.

[0018] Figure 5 It is a processing flow chart of a PDT terminal receiving a migration signaling in an embodiment of the present invention.

[0019] Figure 6 The flowchart is a diagram of a PDT cluster base station stopping sending migration signaling after the migration validity period expires in an embodiment of the present invention.

[0020] Figure 7 This is a processing flow chart of a PDT terminal after the migration time limit expires in an embodiment of the present invention. DETAILED DESCRIPTION

[0021] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0022] like Figure 1 As shown, when the PDT cluster uses the standard C_MOVE signaling to send migration signaling, some PDT terminals (digital walkie-talkies based on the PDT protocol) that are performing other services will miss the signal. In addition, according to the standard C_MOVE signaling definition table (Table 1), since only one terminal address can be carried at a time, when multiple terminals need to be migrated, it is easy to cause congestion in the downlink control channel of the PDT base station (digital cluster base station based on the PDT protocol).

[0023] Table 1 C_MOVE signaling definition table

[0024] To this end, the present invention proposes a method for migrating and registering a base station based on a digital cluster terminal, which is specifically as follows: First, the PDT base station sends a migration signaling requesting the destination terminal to migrate out of the base station, such as Figure 2 As shown in the figure, the common broadcast channel signaling sent by the PDT base station carries the time slot count CSC. The CSC count increases by 1 every 4 time slots. The count range starts from 0 to 511 and is periodic. The common broadcast channel signaling is sent in each time slot and does not occupy the downlink protocol signaling space. The common broadcast channel CACH (Common Announcement Channel) is as shown in the figure. Figure 3 As shown, the PDT base station sends channel information every 30ms, and 4 CACHs form a complete time slot count CSC information, such as Figure 4 shown.

[0025] Then, the PDT terminal air interface number is reset. In the embodiment of the present invention, the PDT terminal air interface number is 24 bits, consisting of two parts: the network area identification code NAI and the short individual call address code SSI, as shown in Table 2: Table 2 PDT terminal 24-bit air interface address composition structure table Classification NAI SSI Number of bits 9 15 NAI is the first 9 bits of the network-wide regional identification code. The NAI numbers of terminals in an area are the same and are known internally in the terminals. They do not need to be carried in migration signaling. The last 15 bits are SSI, which is different for each terminal. The SSI is divided into high 6 bits and low 9 bits. Since the PDT base station will send down the time slot count CSC, the base station and terminal counts are synchronized. The CSC count is also 9 bits, and the SSI low 9 bits are matched one-to-one with the CSC value.

[0026] The PDT cluster base station sends the corresponding target terminal migration signaling in the corresponding CSC time slot. If there are multiple terminal addresses with the same lower 9 bits, the base station side saves them in the same list and waits for polling transmission.

[0027] That is, the PDT base station sends the migration signaling in the time slot where the CSC count and the lower 9 bits of the terminal address that needs to be migrated are the same. In this way, only the high 6 bits of SSI need to be carried. The base station puts the terminal addresses that need to be notified of migration into a list and sends the migration signaling in the control channel time slot where the lower 9 bits of the target terminal SSI data and the CSC count are the same. The CSC count is 0~511 cyclically, so the base station can send the migration signaling cyclically.

[0028] In the custom migration signaling (Table 3), a target terminal only needs to carry the SSI high 6 bits of data content. An 80-bit migration signaling can carry 64 bits of effective information. Excluding the 4-bit migration parameter, the remaining can carry 10 terminal addresses with the same SSI high 6 bits. If there are more than 10 terminal addresses with the same low 9 bits in the list, they cannot be sent down at one time. In this case, they can be sent down in a cyclic polling manner based on periodic technology.

[0029] Table 3 Customized migration signaling structure

[0030] In order to ensure that the target terminal reliably receives the migration signaling, the base station periodically sends the migration signaling to each target terminal according to the sending cycle of the CSC until the system cancels the terminal migration command.

[0031] like Figure 5 As shown, the terminal receives the migration signaling, takes out the 6-bit SSI data, and restores the 24-bit terminal address based on the local NAI plus the high 6-bit address data carried by the migration signaling, plus the current CSC count, that is, NAI+SSI (high 6 bits)+CSC; if the 24-bit terminal address is the same as the local terminal address, the terminal adds the current base station channel number to the blacklist, and the terminal goes offline and rescans to register a new base station. The terminal will not initiate registration when scanning a base station in the blacklist.

[0032] The migration signaling carries a valid duration. When the migration duration expires, Figure 6 As shown, the PDT cluster base station cancels the periodic sending of migration signaling, such as Figure 7 As shown, the terminal removes the migration base station from the blacklist.

[0033] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some or all of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for migrating and registering a base station based on a digital cluster terminal, applied to a base station side, characterized in that: Construct a public broadcast signaling that carries a time slot count, and make the time slot count correspond to the address of the target terminal to be migrated. Based on the periodic time slot count, when the time slot count corresponding to the address of the target terminal to be migrated is reached, send the public broadcast signaling and the migration signaling at the same time, so that the receiving target terminal compares its address with the time slot count, and migrates the terminal out of the base station when a match is found.

2. A method for migrating and registering a base station based on a digital cluster terminal according to claim 1, characterized in that: The time slot count carried corresponds to the low-bit short individual call address code of the air interface number of the target terminal to be migrated. When the migration signaling is sent down, the time slot count corresponds to the same low-bit short individual call address code of multiple target terminal addresses to be migrated. The migration signaling only carries the high-bit short individual call address code of the air interface number of the target terminal to be migrated, so that the receiving target terminal compares its short individual call address code with the time slot count and the high-bit short individual call address code in the migration signaling, and migrates the terminal out of the base station when a match is found.

3. A method for migrating and registering a base station based on a digital cluster terminal according to claim 2, characterized in that: The air interface number also includes a network-wide regional identification code. The target terminals in the unit area have the same network-wide regional identification code. By sending migration signaling, the receiving target terminal restores the received terminal address based on the network-wide regional identification code and the short call address code carried in the migration signaling. If the restored terminal address is the same as the received target terminal address, the receiving target terminal is moved out of the current base station.

4. A method for migrating and registering a base station based on a digital cluster terminal according to claim 1, characterized in that: The target terminal address to be migrated is put into the migration terminal list, and is sent in round-robin fashion. The migration signaling carries the effective migration duration. When the effective migration duration is exceeded, the periodic sending of the migration signaling is cancelled.

5. The method for migrating and registering a base station based on a digital cluster terminal according to claim 1, characterized in that: The time slot count is counted and accumulated every N time slots, and is counted periodically. A common broadcast channel signaling carrying the time slot count is sent down in each time slot, and N common broadcast channels constitute complete time slot count information.

6. A method for terminal migration based on digital cluster, applied to the terminal side, characterized in that: Obtain the public broadcast signaling and migration signaling sent simultaneously. The time slot count carried in the public broadcast signaling corresponds to the target terminal address to be migrated. The received migration signaling is sent when the time slot count reaches the target terminal address to be migrated during the periodic time slot counting process. Compare the local address with the time slot count in the migration signaling, and migrate the target terminal when a match is found.

7. A method for migrating digital trunking terminals according to claim 6, characterized in that: The received time slot count corresponds to the low-bit short individual call address code of the air interface number of the target terminal to be migrated; the received migration signaling, for the same low-bit short individual call address code of multiple target terminal addresses to be migrated corresponding to the time slot count, only carries the high-bit short individual call address code of the air interface number of the target terminal to be migrated, compares the local short individual call address code with the received time slot count and the high-bit short individual call address code, and migrates the target terminal when a match is found.

8. The method for migrating digital trunking terminals according to claim 7, characterized in that: The air interface number also includes a network-wide regional identification code. The target terminal in the unit area has the same network-wide regional identification code. Based on the network-wide regional identification code and the short call address code carried in the received migration signaling, the target terminal address is restored. If the restored target terminal address is the same as the local address, the target terminal is migrated.

9. The method for migrating digital trunking terminals according to claim 6, characterized in that: When the match is made, the currently registered base station is added to the migration base station blacklist, and a new base station is scanned and registered again after disconnection from the network. For base stations in the blacklist scanned, registration is not initiated; The received migration signaling carries the effective migration duration. When the effective migration duration is exceeded, the migration base station is removed from the blacklist.

10. A system for migrating and registering a base station based on a digital trunking terminal, comprising a base station and a terminal registered with the base station, characterized in that: The base station constructs a public broadcast signaling carrying a time slot count, and makes the time slot count correspond to the address of the target terminal to be migrated, and based on the periodic time slot count, when the time slot count corresponding to the address of the target terminal to be migrated is reached, simultaneously sends the public broadcast signaling and the migration signaling; The terminal receives the migration signaling and compares its local address with the time slot count in the migration signaling, and when a match is found, migrates the terminal out of the base station where it is registered.

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