CN101494843A - Method for shortening emergency group call built-up time using beforehand notification - Google Patents
Method for shortening emergency group call built-up time using beforehand notification Download PDFInfo
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- CN101494843A CN101494843A CNA2009100794700A CN200910079470A CN101494843A CN 101494843 A CN101494843 A CN 101494843A CN A2009100794700 A CNA2009100794700 A CN A2009100794700A CN 200910079470 A CN200910079470 A CN 200910079470A CN 101494843 A CN101494843 A CN 101494843A
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Abstract
The invention is a method for shortening emergency group calling establishing time by notifying in advance, suitable for GSM-R system. The urgency of emergency group calling determines the rapidity of establishment. The technical scheme adopted in the invention is notifying in advance: adding a wireless parameter 'notifypriorthreshold' on the base station controller, which is defined as a threshold priority of adopting notification in advance; when the group calling priority is higher than the priority default value, calling the SCCP connection to be established; when the base station controller receives a group calling assignation request message, sending a notification message to mobile station, and starting the advance notification process. By using advance notification, the invention shortens the time that hearer enters into the group calling, can enables user to enter into group calling almost at the same time that resource control SCCP connection establishes, and can save about 300ms group calling establishing time comparing with normal notification process.
Description
Technical field
The present invention relates to mobile communication technology, relate in particular to the group calling technology of a kind of GSM-R of being used for system.
Background technology
GSM-R (GSM-Railway, railway combined digital mobile communication system) system is based on GSM public mobile communication technology, replaces the railway combined digital mobile communication system of existing multiple railway communication and control system with GSM common development, available single platform.
The GSM-R system is the comprehensive special digital mobile communication system that designs for railway communication specially.It is at the advanced speech call function of the specification protocol of GSM Phase2+, seize on the basis with forced release service as group calling, broadcast ﹠ call, multipriority, add functions such as location dependent addressing and functional addressing, be applicable to the particularly needs of railway specific schedule communication of railway communication.Train dispatch radio communication mainly is provided, function of voice communication such as the communication that makes up of trains, section maintenance operation communication, emergency communication, tunnel communication, can be the automatic control of train and provide data transmission channel, and train automatic addressing and passenger's service can be provided with detection information.Frequency range in Chinese Railway is up 885-889MHz, and down direction is 930-934MHz.
The GSM-R system generally includes network subsystem (NSS), base station sub-system (BSS), operation and four parts such as business support subsystem (OSS/BSS) and terminal equipment.Wherein, network subsystem comprises mobile switching subsystem (SSS), mobile intelligent net (IN) subsystem and GPRS (GPRS) subsystem.
The GSM-R transmission system refers to the digital transmission system that passage is provided for the connection between each subsystem of GSM-R system, comprise that the GSM-R system is for providing basic service necessary transmission matching unit, as transmit light, cable and transmission equipment, but do not comprise the interface channel between repeater remote termination and the near-end machine, do not comprise connections such as antenna feeder yet.
Voice group call service (Voice Group Call Service, VGCS) be a kind of advanced speech call business that GSM-R provides, it has defined a kind of by participating in (travelling carriage or fixed line) in many ways, wherein the voice communication mode of the some people point-to-multipoint that can talk, listen in many ways.Voice group call service has been broken through the limitation of point-to-point communication, can set up group call in simple and efficient mode, realizes specific functions such as dispatch control, emergency notice, is particularly useful for the train traffic control traffic department of railway.
What voice group call service used is the common downlink broadcast capability, this function allows a lot of users in same sub-district to listen to group calling on a Traffic Channel, can save air interface between network element and the available resources on the signaling link in this way, so the availability of frequency spectrum is higher.A specific VGCS communication is unique definite by group function code (abbreviation group ID) and group calling territory.Group ID and group call region are collectively referred to as group call reference, and promptly group call reference is unique determines that a VGCS communicates by letter.Group ID identifies the function of this group, and promptly the member by which identity participates in; Group call region is meant the geographic range that VGCS signal post covers, and is base unit with the radio honeycomb sub-district, and a group calling district can have 25 radio honeycomb sub-districts (hereafter is " sub-district ") at most.In the same moment, only allow user's speech, allow maximum 5 dispatchers to talk simultaneously.The dispatcher can hear proprietary speech except own, listens to the user and can hear proprietary talk.If the dispatcher is arranged simultaneously in speech, spoken user should obtain certain indication.The dispatcher allows to talk at any time to need not to send and wants the signal of talking, and the service-user of wanting to speak must send and wants the signal of talking, network according to first earlier the principle right of distributing spoken user, need not queuing.After a service-user becomes spoken user, also should send at last and want to become the indication of listening to the user, discharge corresponding group call uplink link.During VGCS set up, the two-way channel of standard being provided for calling subscriber and dispatcher distributed single downlink channel for all called service users.
For satisfying the high performance requirements of railway for the communication of some type, GSM-R has defined and has been called senior traffic function (ASCI, Advanced Speech Call Item) and enhanced multilayer time seize and pre cleaning (eMLPP, enhanced Multi-Level Precedence and Pre-emption service) function guarantees that the fast and reliable of high-grade calling or urgent call is set up.Chinese Railway is defined as follows about call priority: 0 grade: railway emergency call; 1 grade: row control transfer of data is called out; 2 grades: dispatching communication high-priority call (group calling, individual exhaling), public emergency call; 3 grades: dispatching communication is called out; 4 grades: other calling.
The urgency of emergency group call has determined the rapidity of its foundation.3GPP (3rd Generation PartnershipProject, the 3G (Third Generation) Moblie affiliate) agreement has shortened the time that emergency group call is set up to a certain extent to the standard of emergency group call, find by doing test, on this basis, can also further shorten the settling time of emergency group call.
Call set-up time is defined as the user and presses " transmission " button receives information at least one called subscriber time.For the group calling hearer, call set-up time is exactly to initiate user's channel request message receives notification message at least 1 group calling user time.
Generally speaking, when taking the method for normal notice, behind the result who obtains the group-calling channel assignment, promptly receive group calling domination results messages after, initiate notification process.For emergency group call,, can on the resource allocation time, cause redundancy if still adopt said method.
Summary of the invention
The invention discloses a kind of emergency group call method of settling time that shortens, if the priority of emergency group call exceeds general voice group call service, by using the prior notice mode, change notification message and message group calling assignment result's order, make emergency group call on the basis of 3GPP protocol specification, further shorten the time that emergency group call is set up.
The technical solution adopted for the present invention to solve the technical problems is as follows:
The base station controller place increases wireless parameter a: notifypriorthreshold newly, is defined as the thresholding priority of taking prior notice.When group calling priority is higher than notifypriorthreshold, sets up SCCP (Signal Connection Control Part, SCCP) and connect.Base station controller receives after the group calling assignment request message, promptly to the travelling carriage message of giving notice, promptly starts the prior notice process.
According to an aspect of the present invention, provide a kind of prior notice of using to shorten the emergency group call method of settling time, this method is applicable to the GSM-R system, and this method comprises the following steps:
At base station controller (Base Station Controller, BSC) locate newly-increased wireless parameter: notifypriorthreshold, this parameter-definition is to take the thresholding priority of prior notice, promptly when the priority of emergency group call was higher than set thresholding priority, network just started the prior notice process;
When emergency group call priority is higher than notifypriorthreshold, sets up one between mobile services switching centre and the base station controller and be exclusively used in and transmit therewith that the SCCP of the relevant signaling of group calling connects.Base station controller receives after the group calling assignment request message, to the travelling carriage message of giving notice, indicates and sets up the network terminal emergency group call.According to the indication of travelling carriage, connect emergency group call, base station controller returns group calling assignment result to mobile services switching centre simultaneously, and then sets up emergency group call.
According to another aspect of the present invention, thresholding priority default setting is 2 grades of minimum values, and span is 2 to 5 grades.Wherein 5 grades is limit priority; 2 grades is normal priority.The limit priority that driver and operation conductor can be contracted is 3 grades, and dispatcher's priority is 4 grades.Limit priority 5 is left some superusers for and is used.Network manager can dispose voluntarily according to the particular surroundings of different regions.
Advantage of the present invention is: by using the prior notice mode, accelerated the hearer and entered the time of group calling, hearer user adds group calling and almost is connected foundation with resource control SCCP and finishes simultaneously, than normal notification procedure, has saved the duration of about 300ms.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is to use the emergency group call of prior notice to set up the agreement flow process;
Fig. 2 is that emergency group call is set up the agreement flow chart in the 3GPP protocol specification in the prior art (TS 03.68).
Embodiment
The technical solution used in the present invention is to use the prior notice mode, by changing the order of notification message and group calling assignment results messages, makes emergency group call further shorten the time that emergency group call is set up on the basis of 3GPP protocol specification.
Under abnormal conditions, also exist group calling successfully not set up but the still negative effect of notified message of user when using prior notice.Take all factors into consideration the scheme of devices from different manufacturers, prior notice and group calling priority factor are combined make the group calling performance reach optimum.When speaker user initiates the high priority group calling on the one hand, the time that hearer user enters group calling is shortened, on the other hand because the above group calling of priority 2 level just has the ability of resource race to control, this can alleviate the Bulk Call area to a certain extent in some the Radio Resource deficiency danger that causes group calling successfully to set up in particular cases.
According to a specific embodiment of the present invention, the concrete technical scheme that is adopted is as follows:
Step 1: at base station controller (Base Station Controller, BSC) locate newly-increased wireless parameter: notifypriorthreshold, this parameter-definition is to take the thresholding priority of prior notice, promptly when the priority of emergency group call was higher than set thresholding priority, network just started the prior notice process.
Thresholding priority default setting is 2 grades of minimum values, and span is 2 to 5 grades.Wherein 5 grades is limit priority; 2 grades is normal priority.The limit priority that driver and operation conductor can be contracted is 3 grades, and dispatcher's priority is 4 grades.Limit priority 5 is left some superusers for and is used.Network manager can dispose voluntarily according to the particular surroundings of different regions.
Step 2: when emergency group call priority is higher than notifypriorthreshold, sets up one between mobile services switching centre and the base station controller and be exclusively used in and transmit therewith that the SCCP of the relevant signaling of group calling connects.Base station controller receives after the group calling assignment request message, to the travelling carriage message of giving notice, indicates and sets up the network terminal emergency group call.According to the indication of travelling carriage, connect emergency group call, base station controller returns group calling assignment result to mobile services switching centre simultaneously, and then sets up emergency group call.
The concrete signaling process of step 2 is referring to Fig. 1.
The detailed process of this flow process is as follows:
Step 2-1: travelling carriage sends the Random Access Channel request message to base station controller, and indicating professional type in the Random Access Channel request message is emergency group call.
Step 2-2: after base station controller is received channel request message, notify travelling carriage with the control channel that is distributed by immediate assignment message.
Step 2-3: travelling carriage is initiated service request and link setup Indication message to base station controller, and indication will be set up voice group call service.
Step 2-4: base station controller provides the preliminary information of voice group call service to mobile services switching centre by complete layer three message on this Traffic Channel.
Step 2-5: mobile services switching centre sends the access procedure request message to Visited Location Registor, and indication Visited Location Registor contrast log-on data is verified the voice group call service of being asked.
Step 2-6: Visited Location Registor returns the access procedure acknowledge message to mobile services switching centre, confirms requested business.
Step 2-7: base station controller sends layer two link setup acknowledge message to travelling carriage, confirms that second layer link has connected and provide the solution of service request.
Step 2-8: mobile services switching centre sends message to Visited Location Registor, and the group ID that is requested group calling is sent to Visited Location Registor.
Step 2-9: Visited Location Registor returns to mobile services switching centre and finishes message related to calls, finishes the affirmation to group ID.
Step 2-10: mobile services switching centre sends group calling attribute request message to Group Call Register, request group calling attribute.
Step 2-11: Group Call Register sends group calling attribute acknowledge message to mobile services switching centre, returns the group calling attribute that mobile services switching centre is asked.
Step 2-12: mobile services switching centre is set up message to base station controller transmission group calling, and beginning is directly set up calling control SCCP connection and is connected with resource control SCCP.
Step 2-13: call out that control SCCP connects and resource control SCCP be connected set up after, base station controller returns group calling to mobile services switching centre and sets up acknowledge message.
Step 2-14: mobile services switching centre sends assignment request message to base station controller, asks to initiating Traffic Channel of travelling carriage assignment of group calling.
Step 2-15: base station controller returns the assignment results messages to mobile services switching centre, responds the Traffic Channel Assignment request.
Step 2-16: mobile services switching centre sends the group calling assignment request message to all relevant base station controllers, wherein comprises information such as group call reference, channel type cryptographic algorithm.
Step 2-17: base station controller receives after the group calling assignment request message, and to the travelling carriage message of giving notice, indication network end emergency group call is set up, and starts the prior notice process immediately.
Step 2-18: according to the indication of travelling carriage, connect emergency group call, base station controller returns group calling assignment result to mobile services switching centre simultaneously.
Step 2-19: mobile services switching centre sends connection message to travelling carriage, confirms that group calling successfully connects.
Wherein, above-mentioned steps 2-1 specifically comprises:
The encoded radio of channel request message rationally is set.According to 3GPP protocol specification TS 0408, the 8bit encoding scheme of this message has 4 kinds to be left use in the future, and is as shown in table 1.Set 01111111 this be encoded to the initiation emergency group call.
| Value | Meaning |
| 01100xx0 | Keep in the future and use, when network is received this value, will distribute a SDCCH channel for travelling carriage |
| 01100x01 | Keep in the future and use, when network is received this value, will distribute a SDCCH channel for travelling carriage |
| 01100011 | Keep in the future and use, when network is received this value, will distribute a SDCCH channel for travelling carriage |
| 01111111 | Keep in the future and use, when network is received this value, will ignore this message. |
Table 1 channel request message coding retention
According to a specific embodiment of the present invention, by using the prior notice mode, accelerate the hearer and entered the time of group calling, hearer user adds group calling and almost is connected foundation with resource control SCCP and finishes simultaneously, than normal notification procedure, saved the duration of about 300ms.
In order to be compared, the difference that the emergency group call of clearer demonstration the present invention and 3GPP protocol specification is set up, the spy has listed among the 3GPP standard TS 03.68 emergency group call and has set up the agreement flow chart, referring to Fig. 2.
The difference of Fig. 1 and Fig. 2 is following 2 points:
1. the order of " notice " among step 2-17 and the step 2-18 and " group calling assignment result " these two signalings is different with the signaling sequence of corresponding step among the existing 3GPP protocol specification TS 03.68;
2. the newly-increased thresholding priority parameters at the base station controller place when group calling priority is higher than the thresholding of setting, starts the prior notice process immediately.
The order of remaining signaling and signaling all is 3GPP protocol specification TS 03.68 an existing technology among the data structure of " notice " and " group calling assignment result " these two signalings, Fig. 1.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (4)
1. one kind is used prior notice to shorten the emergency group call method of settling time, and this method is applicable to the GSM-R system, it is characterized in that, this method comprises the following steps:
Step 1: newly-increased wireless parameter: notifypriorthreshold at the base station controller place is to take the thresholding priority of prior notice with this parameter-definition;
Step 2: when emergency group call priority is higher than notifypriorthreshold, sets up one between mobile services switching centre and the base station controller and be exclusively used in and transmit therewith that the SCCP of the relevant signaling of group calling connects; Then, base station controller receives after the group calling assignment request message, to the travelling carriage message of giving notice, indicates and sets up the network terminal emergency group call; At last, according to the indication of travelling carriage, connect emergency group call, base station controller returns group calling assignment result to mobile services switching centre simultaneously, and then sets up emergency group call.
2. according to the method for claim 1, it is characterized in that described step 2 specifically comprises:
Step 2-1: travelling carriage sends the Random Access Channel request message to base station controller, and indicating professional type in the Random Access Channel request message is emergency group call;
Step 2-2: after base station controller is received channel request message, notify travelling carriage with the control channel that is distributed by immediate assignment message;
Step 2-3: travelling carriage is initiated service request and link setup Indication message to base station controller, and indication will be set up voice group call service;
Step 2-4: base station controller provides the preliminary information of voice group call service to mobile services switching centre by complete layer three message on this Traffic Channel;
Step 2-5: mobile services switching centre sends the access procedure request message to Visited Location Registor, and indication Visited Location Registor contrast log-on data is verified the voice group call service of being asked;
Step 2-6: Visited Location Registor returns the access procedure acknowledge message to mobile services switching centre, confirms requested business;
Step 2-7: base station controller sends layer two link setup acknowledge message to travelling carriage, confirms that second layer link has connected and provide the solution of service request;
Step 2-8: mobile services switching centre sends message to Visited Location Registor, and the group ID that is requested group calling is sent to Visited Location Registor;
Step 2-9: Visited Location Registor returns to mobile services switching centre and finishes message related to calls, finishes the affirmation to group ID;
Step 2-10: mobile services switching centre sends group calling attribute request message to Group Call Register, request group calling attribute;
Step 2-11: Group Call Register sends group calling attribute acknowledge message to mobile services switching centre, returns the group calling attribute that mobile services switching centre is asked;
Step 2-12: mobile services switching centre is set up message to base station controller transmission group calling, and beginning is directly set up calling control SCCP connection and is connected with resource control SCCP;
Step 2-13: call out that control SCCP connects and resource control SCCP be connected set up after, base station controller returns group calling to mobile services switching centre and sets up acknowledge message;
Step 2-14: mobile services switching centre sends assignment request message to base station controller, asks to initiating Traffic Channel of travelling carriage assignment of group calling;
Step 2-15: base station controller returns the assignment results messages to mobile services switching centre, responds the Traffic Channel Assignment request;
Step 2-16: mobile services switching centre sends the group calling assignment request message to all relevant base station controllers, wherein comprises information such as group call reference, channel type cryptographic algorithm;
Step 2-17: base station controller receives after the group calling assignment request message, and to the travelling carriage message of giving notice, indication network end emergency group call is set up, and starts the prior notice process immediately;
Step 2-18: according to the indication of travelling carriage, connect emergency group call, base station controller returns group calling assignment result to mobile services switching centre simultaneously;
Step 2-19: mobile services switching centre sends connection message to travelling carriage, confirms that group calling successfully connects.
3. according to the method for claim 1 or 2, it is characterized in that described step 2-1 specifically comprises: the encoded radio that channel request message rationally is set; Set 01111111 this be encoded to the initiation emergency group call.
4. according to the method for claim 1 or 2, it is characterized in that: thresholding priority default setting is that minimum value is 2 grades, and span is 2 to 5 grades; Wherein, 5 grades is limit priority, and 2 grades is normal priority.
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Open date: 20090729 |