CN101137227B - Hard handoff method in digital cluster system - Google Patents
Hard handoff method in digital cluster system Download PDFInfo
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- CN101137227B CN101137227B CN2007101094237A CN200710109423A CN101137227B CN 101137227 B CN101137227 B CN 101137227B CN 2007101094237 A CN2007101094237 A CN 2007101094237A CN 200710109423 A CN200710109423 A CN 200710109423A CN 101137227 B CN101137227 B CN 101137227B
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Abstract
The invention discloses a hard handoff method in digital trunking systems, the method comprises following steps: step 102, a terminal finds neighbor cell information stored therein, if the terminal does not find a shared channel source allocated by a target cell for the call, sends a handoff request information to an original base station subsystem to request handoff; step 104, if the original base station subsystem finds that the target cell which is required handoff does not belong to the subsystem, sends acquired neighbor cell information request information to a scheduling server, the cheduling server notifies the target base station subsystem and the target cell to establish resource; step 106, the scheduling server transmits the request response information to the original base station subsystem, the original base station subsystem updates neighbor cell channel assignment messages, the terminal receives neighbor cell channel assignment messages and stores neighbor cell information thereof; and step 108, neighbor cell information captures a target cell as a shared channel which is established for the call, the terminal switches to the target cell.
Description
Technical field
The present invention relates to the hard-switching technology field of mobile communication, be specifically related to the control method that a kind of colony terminal is striden the base station sub-system direct-cut operation.
Background technology
Mobile communication technology has developed into the third generation, and trunking communication is as an important branch of mobile communication, and is also growing.Historically, early stage trunking communication is served the professional user because technical sophistication, with high costs is mainly used in the private network operation, must need the special sector and the unit of command scheduling such as army, railway, navigation etc.Along with the reduction and the expanding economy of development of technology, cost, the public mobile communication of social individual consumer's radio communication needs just occurred being fit to afterwards, even so, current cluster communication still belongs to personal communication system basically.
Trunking communication has been experienced simple intercom system (intercommunication form one to one) to single base station mini system (joining common-frequency simplex network construction form, alien frequencies list (two) worker network construction form, the single channel form of getting ready to go into action in hundreds, band selective call form, the multichannel form that dials automatically), arrive the development course of big capacity multizone system (the multichannel user shares form) again, after experienced again from the simulation cluster to the leap of Digital Clustering, this leap makes trunking communication at signalling coding, the multi-access mode that adopts, speech coding, modulation-demodulation technique, simultaneous techniques, aspect such as error-detection error-correction and diversity technique all can adopt more reliable digital processing mode.Two kinds of digital cluster systems of extensive use at present are based on the iDEN (integratedDigital Enhanced Network) and the TETRA (Terrestrial Trunked Radio) of TDMA multiple access technology.In order to promote the sizable application of digital cluster system, further to boost the efficiency of frequency resources utilization simultaneously, trunked communication system a new application trend occurred on using, and that is exactly to go up at existing public network (GSM, CDMA) to realize Clustering.
The Digital Clustering of realizing based on CDMA 2000 technology mainly contains two kinds by channel resource allocation mode branch at present: a kind of enhanced that is called is called out, when carrying out trunked call, for each cluster user terminal is distributed air traffic channel separately, user terminal is by the paging mode incoming call by existing CDMA 20001X normal voice calls, and to insert when calling out what be that the terminal distribution channel also adopts in terminal be the channel allocation mode of normal voice calls.Another kind is called traditional type and calls out, be to adopt the Channel Sharing mode on the mode of channel resource allocation, simultaneously base station controller is set up successfully afterwards on paging channel the periodicity broadcast transmission with the beep-page message of group id addressing at wireless channel, the terminal that belongs to this group is the upright forward traffic channel of this establishment according to the information capture in the beep-page message, automatically in the access group.Use comparatively common and save more resource for the second way, the control method of the direct-cut operation in the trunked call that also is based on the second way that the present invention discussed.
In the prior art, trunked call based on shared channel, the switching great majority of terminal all are autonomous switchings, belong to the soft handover category, promptly the terminal in being in calling by the cell-of-origin when Target cell moves, Target cell has established the shared channel resources of this trunked call, and terminal inserts Target cell and finishes switching for the shared channel of terminal distribution in its sub-district.And the switching of striding base station sub-system is when taking place, target side may not have the shared channel resources of this calling, the way of prior art is to set up a dedicated channel for the user earlier, after the user switches to dedicated channel, again the user is linked in the shared channel of setting up thereafter and discharges this dedicated channel.The hard-switching technology of striding base station sub-system just that the present invention inquires into when target side does not have shared channel resources, does not need to set up earlier dedicated channel, but directly set up shared channel, Comparatively speaking, the present invention saves resource more, flow process is simple, has remedied the deficiencies in the prior art.And in the prior art, handoff request and Signalling exchange only carry out between source base station and target BS, do not consider sharing the influence of cluster data link (STDL) between base station side and the network side.Description of the invention relates to the foundation of network equipment and STDL, and is more complete to the description of system.
At the problems referred to above, expectation provides a kind of solution that more can satisfy present digital clustering communication system needs.
Summary of the invention
The object of the present invention is to provide a kind of in the CDMA2000 Digital Clustering terminal realize striding the control method of base station sub-system direct-cut operation, this method can improve switching efficiency, guarantees the reliability switched to reduce system loading, reduces the influence of switching voice.
According to an aspect of the present invention, method for hard switching in a kind of digital cluster system is provided, this method may further comprise the steps: step 102, the signal strength signal intensity that detects Target cell when terminal is greater than the signal strength signal intensity of current area and when satisfying switching condition, terminal is searched the neighboring BS information of its storage, if terminal search the fall short sub-district for this call distribution shared channel resources, then terminal sends handoff request message to source base station subsystem and switches with request; Step 104, after source base station subsystem is received handoff request message, do not belong to source base station subsystem if find the Target cell that needs to switch, then obtain the neighboring BS information request message and set up resource with request target base station sub-system and Target cell to the dispatch server transmission, dispatch server notification target base station sub-system and Target cell are set up resource, after subsystem of objective base station and Target cell were successfully set up resource, subsystem of objective base station returned and obtains the neighboring BS information request response; Step 106, the neighboring BS information request response of obtaining that dispatch server will receive is transmitted to source base station subsystem, after source base station subsystem receives and obtains the neighboring BS information request response, upgrade adjacent zone channel assignment message, terminal receives adjacent zone channel assignment message and stores the neighboring BS information that carries in the assignment message of adjacent area; And step 108, terminal is caught Target cell according to neighboring BS information and is called out the shared channel of being built as this, switches to Target cell.
Comprise following processing in the step 102: after terminal received the pilot strength information that belongs to Target cell, the judgement pilot frequency intensity was greater than current activation pilot tone and surpass autonomous direct-cut operation comparison threshold, and terminal is searched the neighboring BS information of its storage; And if terminal search the fall short sub-district for this call distribution shared channel resources, then send handoff request message to source base station subsystem, otherwise terminal is switched independently.
Wherein, neighboring BS information comprises following at least a or its combination: the Long Code Mask and the WASH sign indicating number of adjacent area sign, Traffic Channel.
Obtaining the neighboring BS information request message comprises: the dispatch location area ID of the IP of source, the dispatch location area ID of cell-of-origin and CI (Cell Identifier, cell ID), Target cell and the group id of CI and this calling; And obtain the neighboring BS information request response and comprise: the dispatch location area ID of the IP of source, the Target cell of request and CI, Target cell are the Resources list of this call distribution and the group id of this calling.
After dispatch server is received and obtained the neighboring BS information request message, search subsystem of objective base station according to the dispatch location area ID and the CI of Target cell.
The step that dispatch server notification target base station sub-system and Target cell are set up resource comprises following processing: whether set up the traditional type call resources between dispatch server judgement and the subsystem of objective base station, if do not set up, then set up the traditional type call resources between the paging request requirement of dispatch server transmission traditional group call and subsystem of objective base station; Whether set up special-purpose shared cluster data link between subsystem of objective base station judgement and the dispatch server, if do not set up, then subsystem of objective base station and dispatch server are set up special-purpose shared cluster data link; Subsystem of objective base station is according to the dispatch location area ID of the Target cell that carries in the paging request, and the notification target sub-district is set up and shared forward traffic channel and shared reverse traffic channel.
After foundation was finished, described subsystem of objective base station returned the described neighboring BS information request response of obtaining and comprises following processing: subsystem of objective base station sends to set up to dispatch server finishes message; Dispatch server is transmitted to subsystem of objective base station and is obtained the neighboring BS information request message; Subsystem of objective base station judges whether Target cell has resource, if there is not resource, then subsystem of objective base station is according to the data and the list item reconstructed object sub-district shared channel resources of this time call information, otherwise, directly carry out following step, that is, subsystem of objective base station obtains the neighboring BS information request response according to the target cell information structure, and sends to dispatch server.
The traditional type that the present invention proposes is called out the method for striding the base station sub-system direct-cut operation, solution effectively the demand of switching in the CDMA cluster network system, guarantee the reliability of link, the continuity of voice can be used in the common network trunking communication field based on CDMA technology.
Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in the specification of being write, claims and accompanying drawing.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart that illustrates according to method for hard switching in the digital cluster system of the present invention;
Fig. 2 is the flow chart that method for hard switching in the digital cluster system according to an embodiment of the invention is shown;
Fig. 3 illustrates according to sub-district of the present invention, adjacent area schematic diagram;
Fig. 4 illustrates according to digital cluster system network structure of the present invention;
Fig. 5 is the terminal receiving target district pilots strength information process chart that illustrates according to the embodiment of the invention;
Fig. 6 be illustrate according to the embodiment of the invention receive terminal handoff request message after, source base station subsystem and dispatch server process chart;
Fig. 7 illustrates to receive after source base station subsystem obtains the neighboring BS information request message dispatch server and subsystem of objective base station process chart according to the embodiment of the invention; And
Fig. 8 illustrates according to the autonomous hand-off process flow chart of the terminal of the embodiment of the invention.
Embodiment
Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the present invention in detail.
Fig. 1 is the flow chart that illustrates according to method for hard switching in the digital cluster system of the present invention.With reference to Fig. 1, may further comprise the steps according to method for hard switching in the digital cluster system of the present invention: step 102, to detect the signal of Target cell strong and when satisfying switching condition when terminal, terminal is searched the neighboring BS information of its storage, if terminal search the fall short sub-district for this call distribution shared channel resources, then terminal sends handoff request message to source base station subsystem and switches with request; Step 104, after source base station subsystem is received handoff request message, do not belong to source base station subsystem if find the Target cell that needs to switch, then obtain the neighboring BS information request message and set up resource with request target base station sub-system and Target cell to the dispatch server transmission, dispatch server notification target base station sub-system and Target cell are set up resource, after subsystem of objective base station and Target cell were successfully set up resource, subsystem of objective base station returned and obtains the adjacent area request response; Step 106, the adjacent area request response of obtaining that dispatch server will receive is transmitted to source base station subsystem, after source base station subsystem receives and obtains the adjacent area request response, upgrade adjacent zone channel assignment message, terminal receives adjacent zone channel assignment message and stores the neighboring BS information that carries in the assignment message of adjacent area; And step 108, terminal is caught Target cell according to neighboring BS information and is called out the shared channel of being built as this, switches to Target cell.
Comprise following processing in the step 102: after terminal received the pilot strength information that belongs to Target cell, the judgement pilot frequency intensity was greater than current activation pilot tone and surpass autonomous direct-cut operation comparison threshold, and terminal is searched the neighboring BS information of its storage; And if terminal search the fall short sub-district for this call distribution shared channel resources, then send handoff request message to source base station subsystem, otherwise terminal is switched independently.
Wherein, neighboring BS information comprises following at least a or its combination: the Long Code Mask and the WASH sign indicating number of adjacent area sign, Traffic Channel; Obtaining the neighboring BS information request message comprises: the dispatch location area ID of the IP of source, the dispatch location area ID of cell-of-origin and CI, Target cell and the group id of CI and this calling; And obtain the neighboring BS information request response and comprise: the dispatch location area ID of the IP of source, the Target cell of request and CI, Target cell are the Resources list of this call distribution and the group id of this calling.
After dispatch server is received and obtained the neighboring BS information request message, search subsystem of objective base station according to the dispatch location area ID and the CI of Target cell.
The step that dispatch server notification target base station sub-system and Target cell are set up resource comprises following processing: after source base station subsystem is received handoff request message, do not belong to base station sub-system if find the Target cell that needs to switch, then send and obtain the neighboring BS information request message to dispatch server; Whether set up the traditional type call resources between dispatch server judgement and the subsystem of objective base station,, then set up the traditional type call resources between the paging request requirement of dispatch server transmission traditional group call and subsystem of objective base station if do not set up; Whether set up special-purpose shared cluster data link between subsystem of objective base station judgement and the dispatch server, if do not set up, then subsystem of objective base station and dispatch server are set up special-purpose shared cluster data link; Subsystem of objective base station is according to the dispatch location area ID of the Target cell that carries in the paging request, and the notification target sub-district is set up and shared forward traffic channel and shared reverse traffic channel; After foundation was finished, subsystem of objective base station sends to set up to dispatch server finished message; Dispatch server is transmitted to subsystem of objective base station and is obtained the neighboring BS information request message; Subsystem of objective base station judges whether Target cell has resource, if there is not resource, then subsystem of objective base station is according to the data and the list item reconstructed object sub-district shared channel resources of this time call information, otherwise, directly carry out following step, that is, subsystem of objective base station obtains the adjacent area request response according to the target cell information structure, and send to dispatch server, and dispatch server is transmitted the adjacent area request response to source base station subsystem.
Fig. 2 is the flow chart that method for hard switching in the digital cluster system according to an embodiment of the invention is shown.With reference to Fig. 2, method for hard switching may further comprise the steps in the digital cluster system according to an embodiment of the invention:
Step S202, it is more intense and satisfy switching condition that terminal detects the signal of Target cell, terminal is searched the neighboring BS information of its storage, if terminal search the fall short sub-district for this call distribution shared channel resources, terminal sends handoff request message and switches to the source base station subsystem request;
Step S204, after source base station subsystem was received handoff request message, the Target cell that find to need switches did not belong to this base station sub-system, then sent to dispatch server and obtained neighboring BS information request message requests subsystem of objective base station and Target cell is set up resource.Dispatch server notification target base station sub-system and Target cell are set up resource, set up successfully after, subsystem of objective base station returns and obtains the adjacent area request response;
Step S206, dispatch server receives that subsystem of objective base station returns obtains the adjacent area request response, transmit this message to source base station subsystem, source base station subsystem is upgraded adjacent zone channel assignment message, and terminal receives described adjacent zone channel assignment message and stores the neighboring BS information that carries in this message; And
Step S208, terminal is caught Target cell according to the described neighboring BS information of storage and is called out the shared channel of being built for this, finishes autonomous switching.
Among the step S202, the method for described transmission handoff request may further comprise the steps:
Step S202-2, after terminal receives the pilot strength information that belongs to Target cell, terminal judges Target cell pilot frequency intensity is greater than current activation pilot tone, and surpass autonomous direct-cut operation comparison threshold, terminal is searched the neighboring BS information of its storage, if search the fall short sub-district for this call distribution shared channel resources, send handoff request message to source base station subsystem.
The neighboring BS information of described terminal storage is: after the traditional type trunked call is set up, the base station can send the message of notice neighboring BS information by forward direction shared service channel terminal in the scope under it, neighboring BS information (the sign that comprises the adjacent area of its traditional type trunked call that is participating in of terminal storage, the Long Code Mask of Traffic Channel, Wash sign indicating numbers etc.), can use these information capture adjacent areas to call out the shared channel of being built for this when terminal switches independently switches.
Among the step S204, described subsystem of objective base station and Target cell are set up the method for resource, may further comprise the steps:
Step S204-2 after source base station subsystem is received handoff request message, finds that the Target cell that needs to switch does not belong to this base station sub-system, then sends to dispatch server and obtains the neighboring BS information request message.
Obtaining the neighboring BS information request message is: obtaining the neighboring BS information request message is a piece of news that defines in the CDMA Digital Clustering.If there is the adjacent area sub-district, its wireless parameter all may be different, and neighboring BS information changes, and in the calling procedure, neighboring BS information need be brought in constant renewal in and obtain in the base station.Among the present invention, base station sub-system in this traditional group call scope is if obtain the neighboring BS information that belongs to other base station sub-system, need to send this message to dispatch server, distribute with acquisition to other base station sub-systems by dispatch server then and reply, comprise the IP that the source is surveyed in the message, the dispatch location area ID of cell-of-origin and CI, the dispatch location area ID of Target cell and CI (can be tabulation), the group id of this calling etc.
After step S204-4, dispatch server receive and obtain the neighboring BS information request message, search subsystem of objective base station according to the dispatch location area ID and the CI of Target cell.Do not set up the traditional type call resources between dispatch server judgement and subsystem of objective base station, enter step S204-6;
Step S204-6, dispatch server elder generation buffer memory obtains the neighboring BS information request message, sets up the traditional type call resources between request and subsystem of objective base station, and shared channel resources is set up in the request target sub-district;
Step S204-8, dispatch server transmit to subsystem of objective base station and obtain the neighboring BS information request message;
Step S204-10, subsystem of objective base station respond and obtain the adjacent area request response.
Obtaining the adjacent area request response is: obtaining the adjacent area request response is a piece of news that defines in the CDMA Digital Clustering, be to obtaining replying of neighboring BS information request message, send to dispatch server by subsystem of objective base station, be transmitted to source base station subsystem by dispatch server again, comprise the IP that the source is surveyed in the message, the dispatch location area ID of the Target cell of request and CI (can be tabulation), Target cell is the Resources list (Long Code Mask of Traffic Channel, Wash sign indicating number etc.) of this call distribution, the group id of this calling etc.
Among the step S204-6, dispatch server and subsystem of objective base station are set up the traditional type call resources, further may further comprise the steps:
Step S204-6-2 sets up the traditional type call resources between the paging request message requirement of dispatch server transmission traditional group call and subsystem of objective base station; Carry the group id of calling, the dispatch location area ID of Target cell etc. in the message;
Step S204-6-4, subsystem of objective base station is received the paging request message of traditional group call, if and set up special use between the dispatch server and share cluster data link (STDL), the special-purpose cluster data link (STDL) of sharing of subsystem of objective base station and dispatch server foundation; If set up STDL, enter step S204-6-6;
Step S204-6-6, subsystem of objective base station is according to the dispatch location area ID of the Target cell that carries in the paging, notify its following respective transceivers to set up and share forward traffic channel and shared reverse traffic channel at Target cell, after foundation was finished, subsystem of objective base station sends to set up to dispatch server finished message.
In the step 206, source base station subsystem renewal adjacent zone channel assignment message and terminal are upgraded the method for the neighboring BS information of its storage, may further comprise the steps:
Step 206-2, dispatch server obtain the adjacent area request response to what source base station subsystem was transmitted subsystem of objective base station;
Step 206-4, source base station subsystem receives that dispatch server returns obtain the adjacent area request response after, upgrade its adjacent zone channel assignment message, and broadcast this message by Traffic Channel,
Wherein, adjacent zone channel assignment message is: adjacent zone channel assignment message is a piece of news that defines in the CDMA Digital Clustering.Traditional group call one is set up, this message is constructed according to the neighboring BS information that gets access in the base station, the Traffic Channel of sharing by forward direction is to the terminal (MS that belongs to its signal cover, Mobile Station, travelling carriage) send, the major function of this message is to be used for notifying terminal with neighboring BS information, the sign that comprises the adjacent area, the Long Code Mask of Traffic Channel, Wash sign indicating numbers etc. are if terminal is known the shared channel that switches and can use these information capture adjacent areas to be built for this calling after these information;
Step 206-6, terminal is upgraded the neighboring BS information of being stored after receiving adjacent zone channel assignment message.
Among the step S208, the autonomous method of switching of terminal may further comprise the steps:
Step S208-2, terminal is caught the shared service channel that this group has been set up in this zone according to the target area information in the neighboring BS information of having stored, independently switches to Target cell;
Step S208-4, the base station, terminal receiving target district of handover success is by the adjacent zone channel assignment message of Traffic Channel broadcasting; And
Step S208-6, terminal is upgraded the neighboring BS information of being stored after receiving adjacent zone channel assignment message.
With reference to Fig. 3 to Fig. 8 an alternative embodiment of the invention is described below.
For convenience of description, earlier the basic concepts in the present embodiment is made an explanation.As shown in Figure 1, the cellular cell that sub-district 302,304,306 among the present invention all refers in the wireless communication field, it is the unit area that signal covers in the radio communication, wherein, cell-of-origin 304 refers to the cellular cell at the present place of terminal, also is the cellular cell that will shift out in the terminal moving process, and Target cell 306 refers to the cellular cell that terminal is about to enter, the adjacent area then is a relative concept, refers in particular to adjacent in the present invention but does not belong to the cellular cell of same base station sub-system.
The digital cluster system network structure that the present invention relates to comprises as shown in Figure 2:
Base station sub-system (BSS, Base Station Subsystem) 402, be used to finish the access of cluster communication service, data communication service and normal speech business, comprise the transceiver (BTS that supports trunked call, Base Transceiver Station) 4022, base station controller (BSC, Base Station Controller) 4024 and with the mutual dispatching client (PDC, PTT Dispatch Client) 4026 of network side;
Dispatch server (PDS, PTT Dispatch Server) 404 is realized the calling control and the right of speech management of trunked call;
Dispatching home location register (PHR, PTT Home Register) (not shown), be used to preserve the log-on message and the positional information of cluster user and group, realize authentication, mandate and billing function, and the position is upgraded and group management function cluster user;
Share cluster data link (STDL), it is CDMA Digital Clustering voice packet, by the carrying of network side to the base station side forwarding, set up in the process by corresponding dispatching client and dispatch server foundation at trunked call, be used to transmit all forward directions or the reverse traffic data (voice flow) of calling, when calling out release, discharge.One between dispatching client and the dispatch server is activated the corresponding STDL link of group, and this STDL link is shared by this activation group user under this dispatching client coverage.
In conjunction with Fig. 3 and shown in Figure 4, if move to the sub-district 306 of the shared channel resources that belongs to another base station sub-system and do not have this calling when terminal is subordinated to a base station sub-system in communication process sub-district 304, will stride the direct-cut operation of base station sub-system, this switching directly influences the Signalling exchange success rate of voice quality and system.
Signal coverage areas shown in Figure 4 is combined into by cellular cell, each signal coverage areas belongs to a base station transceiver 4022, and base station transceiver 4022 belongs to corresponding base station controller 4024, if in the CDMA digital cluster system, then base station controller 4024 also will be subjected to dispatching client 4026 controls of group system, and all sub-districts that belong to this base station controller 4024 so also just belong to corresponding dispatching client 4026.
Further describe the enforcement of technical scheme in real system in detail below in conjunction with accompanying drawing.
Fig. 5 is the terminal receiving target district pilots strength information process chart that illustrates according to the embodiment of the invention, specifically may further comprise the steps:
Step S502, terminal receives the pilot strength information that belongs to Target cell;
Step S504, whether terminal judges Target cell pilot frequency intensity is greater than current activation pilot tone and above autonomous direct-cut operation comparison threshold, if enter step S506; , do not return step S502;
Step S506, terminal is searched the neighboring BS information of its storage, judges whether to find target cell information, if not, then enters step S508; If then enter step S510;
Step S508, Target cell are not this call distribution shared channel resources, and terminal sends handoff request message to source base station subsystem, and process ends;
Step S510, Target cell have been this call distribution shared channel resources, and terminal is independently switched, and process ends.Autonomous hand-off process flow process is in detail referring to Fig. 8 explanation.
Fig. 6 be illustrate according to the embodiment of the invention receive terminal handoff request message after, source base station subsystem and dispatch server process chart specifically may further comprise the steps:
Step S602, source base station subsystem is received the handoff request message of terminal;
Step S604, source base station subsystem judges whether Target cell belongs to this base station sub-system, if enter step S606; If not, enter step S608;
Step S606, source base station subsystem is according to data, the list item reconstructed object sub-district shared channel resources of this time call information; After this step is finished, directly enter step S614;
Step S608, source base station subsystem sends to dispatch server and obtains the neighboring BS information request message;
After step S610, dispatch server receive and obtain the neighboring BS information request message, judge whether to carry out following steps according to situation:
And set up the traditional type resource between subsystem of objective base station;
And set up the special-purpose cluster data link (STDL) of sharing between subsystem of objective base station;
Shared channel resources is set up in the notification target sub-district;
Dispatch server is transmitted to subsystem of objective base station and is obtained the neighboring BS information request message;
Subsystem of objective base station returns and obtains the adjacent area request response; And
Handling process between dispatch server and subsystem of objective base station (in detail referring to Fig. 5 explanation);
Step S612, dispatch server transmit to source base station subsystem and obtain the adjacent area request response;
Step S614, the adjacent zone channel assignment message that the Traffic Channel that source base station subsystem is shared by forward direction is upgraded to the terminal broadcasting that belongs to its signal cover, terminal receives and stores the neighboring BS information of target area; And
Step S616, terminal is independently switched, and process ends.Autonomous hand-off process flow process is in detail referring to Fig. 8 explanation.
Fig. 7 illustrates according to the receiving after source base station subsystem obtains the neighboring BS information request message of the embodiment of the invention, and dispatch server and subsystem of objective base station process chart specifically may further comprise the steps:
Step S702, dispatch server receive source base station subsystem and obtain the neighboring BS information request message, find subsystem of objective base station according to the dispatch location area ID and the CI of the Target cell that carries in the message;
Whether step S704 sets up the traditional type call resources between dispatch server judgement and subsystem of objective base station, if not, enters step S706; If enter step S714;
Step S706, the dispatch server buffer memory obtains the neighboring BS information request message, sets up the traditional type call resources between the paging request message requirement of transmission traditional group call and subsystem of objective base station;
Step S708 judges and whether sets up the special-purpose cluster data link (STDL) of sharing between subsystem of objective base station and the dispatch server, if not, then enter step S710, if then enter step S712;
Step S710, subsystem of objective base station and dispatch server set up the special-purpose cluster data link (STDL) of sharing;
Step S71 2, subsystem of objective base station is according to the dispatch location area ID of the Target cell that carries in the paging, notify its following respective transceivers to set up and share forward traffic channel and shared reverse traffic channel at Target cell, after foundation was finished, subsystem of objective base station sends to set up to dispatch server finished message;
Step S714, dispatch server transmit to subsystem of objective base station and obtain the neighboring BS information request message;
Step S716, subsystem of objective base station judges whether Target cell has resource, if not, enter step S718, if, enter step S720, only in step S704, judge and set up between dispatch server and subsystem of objective base station under the traditional type call resources situation, just may judge Target cell in this step does not have shared channel resources, needs to rebuild upright;
Step S718, subsystem of objective base station is according to data, the list item reconstructed object sub-district shared channel resources of this time call information;
Step S720, subsystem of objective base station obtains the adjacent area request response according to the target cell information structure and sends to dispatch server; And
Step S722, dispatch server is transmitted the adjacent area request response and is given source base station subsystem, and process ends.
Fig. 8 illustrates according to the autonomous hand-off process flow chart of the terminal of the embodiment of the invention, specifically may further comprise the steps:
Step S802, terminal is caught the shared service channel that this group has been set up in this zone according to the target area information in the neighboring BS information of having stored, independently switches to Target cell;
Step S804, the base station, terminal receiving target district of handover success is by the adjacent zone channel assignment message of Traffic Channel broadcasting; And
Step S806, terminal is upgraded the neighboring BS information of being stored after receiving adjacent zone channel assignment message, and process ends.
The traditional type that the present invention proposes is called out the method for striding the base station sub-system direct-cut operation, solution effectively the demand of switching in the CDMA cluster network system, guarantee the reliability of link, the continuity of voice can be used in the common network trunking communication field based on CDMA technology.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (7)
1. method for hard switching in the digital cluster system is characterized in that, may further comprise the steps:
Step 1, the signal strength signal intensity that detects Target cell when terminal is greater than the signal strength signal intensity of current area and when satisfying switching condition, described terminal is searched the neighboring BS information of its storage, if described terminal search less than described Target cell for this call distribution shared channel resources, then described terminal sends handoff request message to source base station subsystem and switches with request;
Step 2, after described source base station subsystem is received described handoff request message, do not belong to described source base station subsystem if find the Target cell that needs to switch, then obtain the neighboring BS information request message and set up resource with request target base station sub-system and described Target cell to the dispatch server transmission, described dispatch server notifies described subsystem of objective base station and described Target cell to set up resource, after described subsystem of objective base station and described Target cell were successfully set up resource, described subsystem of objective base station returned and obtains the neighboring BS information request response;
Step 3, the described neighboring BS information request response of obtaining that described dispatch server will receive is transmitted to described source base station subsystem, described source base station subsystem receive described obtain the neighboring BS information request response after, upgrade adjacent zone channel assignment message, described terminal receives described adjacent zone channel assignment message and stores the neighboring BS information that carries in the assignment message of described adjacent area; And
Step 4, described terminal is caught Target cell according to described neighboring BS information and is called out the shared channel of being built as this, switches to described Target cell.
2. method for hard switching in the digital cluster system according to claim 1 is characterized in that, comprises following processing in the described step 1:
After described terminal receives the pilot strength information that belongs to described Target cell, judge described pilot frequency intensity greater than current activation pilot tone and surpass autonomous direct-cut operation comparison threshold, described terminal is searched the neighboring BS information of its storage; And
If described terminal search less than described Target cell for this call distribution shared channel resources, then send handoff request message to described source base station subsystem, otherwise described terminal is switched independently.
3. method for hard switching in the digital cluster system according to claim 1 and 2 is characterized in that, described neighboring BS information comprises following at least a or its combination: the Long Code Mask and the WASH sign indicating number of adjacent area sign, Traffic Channel.
4. method for hard switching in the digital cluster system according to claim 1 is characterized in that,
The described neighboring BS information request message that obtains comprises: the dispatch location area ID of the IP of source, the dispatch location area ID of cell-of-origin and cell ID, Target cell and the group id of cell ID and this calling; And
The described neighboring BS information request response of obtaining comprises: the dispatch location area ID of the IP of source, the Target cell of request and cell ID, Target cell are the Resources list of this call distribution and the group id of this calling.
5. method for hard switching in the digital cluster system according to claim 4 is characterized in that,
Described dispatch server receive described obtain the neighboring BS information request message after, search described subsystem of objective base station according to the dispatch location area ID and the cell ID of described Target cell.
6. method for hard switching in the digital cluster system according to claim 1 is characterized in that,
The step that described dispatch server notifies described subsystem of objective base station and described Target cell to set up resource comprises following processing: whether set up the traditional type call resources between described dispatch server judgement and the described subsystem of objective base station, if do not set up, set up the traditional type call resources between the paging request requirement of then described dispatch server transmission traditional group call and described subsystem of objective base station; Whether set up special-purpose shared cluster data link between described subsystem of objective base station judgement and the described dispatch server, if do not set up, then described subsystem of objective base station and described dispatch server are set up special-purpose shared cluster data link; Described subsystem of objective base station is notified described Target cell to set up and is shared forward traffic channel and shared reverse traffic channel according to the dispatch location area ID of the described Target cell that carries in the described paging request;
After foundation was finished, described subsystem of objective base station returned the described neighboring BS information request response of obtaining and comprises following processing: described subsystem of objective base station sends to set up to described dispatch server finishes message; Described dispatch server is transmitted the described neighboring BS information request message that obtains to described subsystem of objective base station; Described subsystem of objective base station judges whether described Target cell has resource, if there is not described resource, then described subsystem of objective base station is according to the data and the list item reconstructed object sub-district shared channel resources of this time call information, otherwise, directly carry out following step; And described subsystem of objective base station obtains the neighboring BS information request response according to target cell information structure, and sends to described dispatch server.
7. method for hard switching in the digital cluster system according to claim 1 is characterized in that, described step 4 comprises following processing:
Described terminal is caught the shared service channel that this group has been set up in this zone according to the target area information in the neighboring BS information of having stored, independently switches to described Target cell;
The base station, described terminal receiving target district of handover success is by the described adjacent zone channel assignment message of Traffic Channel broadcasting; And
Described terminal is upgraded described neighboring BS information after receiving described adjacent zone channel assignment message.
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| CN101431730B (en) * | 2008-12-11 | 2011-08-24 | 中兴通讯股份有限公司 | System and method for adjacent zone channel assignment message transmission in open cluster |
| CN101577953B (en) * | 2009-06-09 | 2013-01-16 | 中兴通讯股份有限公司 | Soft handover method and system in trunking communication |
| CN101925140A (en) * | 2009-06-12 | 2010-12-22 | 中兴通讯股份有限公司 | Switching method and device among base stations |
| CN101640847B (en) * | 2009-08-31 | 2014-11-05 | 中兴通讯股份有限公司 | Calling switch method and system |
| WO2011057450A1 (en) * | 2009-11-13 | 2011-05-19 | 中兴通讯股份有限公司 | Method and system for informing mobile station of frame mapping mode by base station subsystem |
| CN103167566A (en) * | 2011-12-14 | 2013-06-19 | 中兴通讯股份有限公司 | Method and device for realizing terminal switching |
| CN103067974B (en) * | 2013-01-11 | 2016-03-02 | 中兴通讯股份有限公司 | The requesting method of a kind of adjacent area resource information, system and eNB |
| CN103945339B (en) * | 2013-01-21 | 2019-05-10 | 中兴通讯股份有限公司 | The release of broadband cluster communication system resource, method for building up, terminal and base station |
| CN105611504B (en) * | 2015-12-25 | 2019-03-19 | 北京中兴高达通信技术有限公司 | The alien frequencies switching method of group calling in a kind of solution broadband cluster system |
| CN107548035B (en) * | 2016-06-28 | 2021-01-26 | 成都鼎桥通信技术有限公司 | Unicast establishment method and terminal |
| CN108882316B (en) * | 2017-05-10 | 2021-11-19 | 华为技术有限公司 | Cell switching method, terminal, base station equipment and communication system |
| CN111542000B (en) * | 2020-04-28 | 2022-01-18 | 哈尔滨海能达科技有限公司 | Channel resource sharing method and device, cluster system controller and storage medium |
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| CN1585554A (en) * | 2004-06-12 | 2005-02-23 | 中兴通讯股份有限公司 | Method for realizing hard changing-over in CDMA cluster system |
| CN1601948A (en) * | 2003-09-22 | 2005-03-30 | 华为技术有限公司 | Method for clustered user's terminal switching between small zones |
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| CN1601948A (en) * | 2003-09-22 | 2005-03-30 | 华为技术有限公司 | Method for clustered user's terminal switching between small zones |
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