CN101494829A - Method for optimizing voice group call establishment process - Google Patents

Abstract

The invention is a method for optimizing voice group calling establishing process, suitable for GSM-R system. a group calling property request signaling and a group calling property result signaling between the mobile service switching center and the group calling register are related in a group calling establishing process. Aiming at the problem of interconnection and intercommunication because the 3GPP voice group calling establishing establish protocol prescription is not clear, the invention provides the complete interaction flow and content of the two signalings, realizes efficient information interaction, increases voice group establishing success probability, while has no change to the existing signaling quantity and signaling data structure; and enable the voice group calling service to be better applied in the railway which is a special environment.

Description

A kind of method of optimizing voice group call establishment process

Technical field

The present invention relates to mobile communication technology, relate in particular to the voice group call service 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.

Interconnecting of GSM-R system is that the equipment interface of different manufacturers carries out interconnected according to the uniform protocol standard, guarantee its standardization and compatibility, railway applications business and function can be realized in the network that devices from different manufacturers constitutes, form the network of a structural integrity, complete function.Realization is interconnected and is helped equipment supply market and form good competition situation, reduces investment outlay, and reduces operating cost, is beneficial to the network long-run development.

Because 3GPP (3rd Generation Partnership Project, the 3G (Third Generation) Moblie affiliate) the voice group call service agreement is to (the Mobile Switch Center of mobile services switching centre in the group call establishment process, MSC) with Group Call Register (Group Call Register, GCR) do not have detailed regulation alternately, cause the mobile services switching centre of different manufacturers can not obtain the group calling attribute of standard from Group Call Register, cause voice group call service successfully to set up, produce the problem that interconnects.

Summary of the invention

The present invention is directed to above voice group call establishment process problem, interactive signaling between 2 mobile services switching centres and the Group Call Register has been proposed complete flow process, the blank spot of voice group call service agreement is replenished.These two signalings are: " group calling attribute request " and " group calling attribute result ".The concrete technical scheme of the present invention is as follows:

In signaling " group calling attribute request ", mobile services switching centre will be organized ID and initiate sub-district ID and together send into Group Call Register, check whether this group calling can be initiated in the sub-district at calling business user place.Return at Group Call Register before " group calling attribute result " signaling, Group Call Register at first obtains group call region ID according to group ID and initiation sub-district ID, obtains group call reference thus, if do not have corresponding group call region ID, then call release.After obtaining group call reference, Group Call Register will check also whether the calling of identical group call reference is underway.If Group Call Register will return to mobile services switching centre and call out ongoing state and group call reference.

Advantage of the present invention is, by the signaling between mobile services switching centre and the Group Call Register has been proposed complete interaction flow, under the situation that does not change existing protocol quantity, realized that high-efficiency information is mutual, improved the probability that voice group is successfully set up.

Description of drawings

The present invention is further described below in conjunction with drawings and Examples.

Fig. 1 is " group calling attribute request " and " group calling attribute result " message flow.

Embodiment

Establishment stage at voice group call service, mobile services switching centre and Group Call Register carry out interactive signaling 2, that is: " group calling attribute request " and " group calling attribute result ", mainly be checking with this group calling ID and initiate whether the corresponding group call reference in sub-district exists and this group calling well afoot whether, finally mobile services switching centre will obtain the property parameters of this group calling.For the equipment that makes different manufacturers better meets the requirement of interconnecting of voice group call service, the present invention proposes the detailed process of " group calling attribute request " and " group calling attribute result " these 2 signalings.

Group calling attribute request signaling is the attribute of mobile services switching centre to Group Call Register request group calling, and the group calling attribute comprises group ID and group call region.

Group calling attribute signaling as a result is that Group Call Register returns the group calling attribute of being asked to mobile services switching centre.

The data structure of these two signalings provides regulation by the 3GPP related specifications, but the 3GPP standard does not provide concrete specified in more detail to the signaling content, and the most important innovation part of the present invention is exactly interaction content and a process of clearly having stipulated these two signalings.

Shown in Figure 1 according to flow process, concrete implementation step of the present invention is as follows:

Step 1: in " group calling attribute request signaling ", mobile services switching centre will be organized ID and initiate sub-district ID and together send into Group Call Register, store relevant MSC area territory of group ID and the sub-district that can set up voice group call service by the user in the Group Call Register, check with this whether this group calling can be initiated in the sub-district at calling business user place.

Step 2: return " the group calling attribute is signaling as a result " at Group Call Register before, Group Call Register at first should and be initiated sub-district ID according to group ID and be obtained group call region ID, obtains group call reference thus; If the user can not set up voice group call service in certain sub-district, just there is not corresponding group call region ID, then call release.

Step 3: after obtaining group call reference, Group Call Register checks whether the calling of identical group call reference is underway;

If then Group Call Register returns to mobile services switching centre and calls out ongoing state and group call reference;

Otherwise Group Call Register is labeled as this group calling " on-going call ", represents the group calling of well afoot, and the group calling attribute is returned to mobile services switching centre.

Step 4: it is service-user or dispatcher that mobile services switching centre is judged;

If service-user, the mobile services switching centre refusal is initiated request, and returns refuse information to the user of application adding group calling, will add group calling by the notification message of seeking respective sets ID on notification channel after the terminal of this service-user;

If judge it is the dispatcher, mobile services switching centre then joins this dispatcher and carries out in the group calling.

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.

Claims (1)

1, a kind of method of optimizing voice group call establishment process is applicable to the GSM-R system, it is characterized in that, this method comprises the following steps:

Step 1: in group calling attribute request signaling, mobile services switching centre will be organized ID and initiate sub-district ID and together send into Group Call Register, check whether this group calling can be initiated in the sub-district at calling business user place;

Step 2: return the group calling attribute as a result before the signaling at Group Call Register, Group Call Register is according to group ID and initiate sub-district ID and obtain group call region ID, obtains group call reference, if do not have corresponding group call region ID, then call release;

Step 3: after obtaining group call reference, Group Call Register checks whether the calling of identical group call reference is underway;

If Group Call Register will return to mobile services switching centre and call out ongoing state and group call reference;

If not, Group Call Register is labeled as this group calling " on-going call ", and the group calling attribute is returned to mobile services switching centre;

Step 4: it is service-user or dispatcher that mobile services switching centre is judged,

If service-user, the mobile services switching centre refusal is initiated request, and returns refuse information to the user of application adding group calling, will add group calling by the notification message of seeking respective sets ID on notification channel after the terminal of this service-user;

If judge it is the dispatcher, mobile services switching centre then joins this dispatcher and carries out in the group calling.

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