CN1989734A - A communication system - Google Patents

Abstract

A communication system including a first and second user equipment in communication over a shared floor and a server means for managing the shared floor. According to the system, the server means is arranged to detect an anonymity request from the first user equipment and, responsive to the anonymity request, to prevent the second user equipment from identifying the first user equipment from user plane messages transmitted from the first user equipment to the second user equipment. The shared floor may relate to a push-to-talk over cellular (PoC) service.

Description

Communication system

Technical field

The present invention relates to a kind of communication system, and especially but do not relate to the communication system of using in the cellular network PTT uniquely.

Background technology

Communication system can be counted as one and can realize two or morely communicating the instrument of session such as the subscriber equipment that is associated with this communication system and/or the inter-entity other node.This communication can comprise, for example, and voice communication, data communication, multimedia communication or the like.Session can be, for example, and the call type session between the user, Multi-Party Conference session, the perhaps communication session between subscriber equipment and the application server such as service provider server (AS).

Communication system usually allows to do given standard or the standard how what operation and this operation to finish and moves according to illustrating those different entities that are associated with this communication system.For example, whether whether this standard or standard can define gives this user, perhaps more accurately, circuit-switched service and/or packet switching service are provided for this subscriber equipment.Also can define the communication protocol and/or the parameter that will be used for this connection.In other words, definition one this communication of cover can based on ad hoc rules communicate by letter with realization.

For subscriber equipment provides the communication system of radio communication is known.An example of wireless system is public land mobile network (PLMN).PLMN is usually based on cellular technology.In cellular system, base station transceiver (BTS) or similarly to insert the wave point of entity by these inter-entity be that mobile subscriber equipment (UE) provides service.Communication about the wave point between the element of this subscriber equipment and this communication network can be based on suitable communication protocol.Base station equipment is communicated by letter the operation of the miscellaneous equipment that needs with this can be by one or several controlled entity control.Different controlled entities can be connected to each other.

One or more gateway nodes can be provided, so that this honeycomb access network is connected to other network, for example be connected to PSTN (PSTN) and/or other communication network such as IP (Internet protocol) and/or other packet switched data network.In this configuration, mobile communications network provides access network, makes the user with wireless user equipment can insert the service that external network, main frame or special services provider provide.

The example that can offer the user business type such as the subscriber of a communication system is so-called multimedia service.Can provide some communication system of multimedia service to be called the internet protocol multi-media network.The IP multimedia function can provide by means of IP multimedia core network subsystem (IMS).This IMS comprises different network entities, so that multimedia service to be provided.In other business, the IMS business is used to provide IP-based packet data communication session between mobile subscriber equipment.

In packet data network, can set up packet data bearer to carry the service traffics on this network.An example of this packet data bearer is packet data protocol (PDP) context.

Provide dissimilar business by means of the different application server (AS) on the IMS.In these business some may be time-criticals.An example of the business of the time-critical that can provide by IMS is so-called directly voice communication service.An example of this class business is ' Push to talk over Cellular ' (PoC) business, is also referred to as PTT (PTT business).Directly voice communication service is the performance that is used for utilizing IMS, realizes that subscriber equipment is connected with IP such as this other side that communicates by letter of other subscriber equipment that is associated with this network or entity.This business allows user and one or more user to carry out instant messaging.

The principle of supporting Push to talk over Cellular (PoC) communication system is the realization of performance in standard cellular telephone of wireless walkie-talkie system.The user selects people or the crowd that will converse with it simply from their phone, and presses PTT key on their mobile phone to begin conversation.Can activate by specific button, contact-key (tangent) or other suitable keyboard.Similarly principle is applied to have the equipment of the user interface of tactile sensing or voice activation.When this user spoke, other one or more users can listen.Because all of this communication session can be similarly to transmit speech data with this PoC application server, so two-way communication can be provided.Can ask the round of talking by activating ptt button etc.The response time that connects almost is moment.

PTT is called out normally half-duplex operation, that is, other user listens when a user speaks.The round of speech by press the PTT button with the First Come First Served be according to or authorize based on priority.PTT is called out does not need the recipient to reply and can connect usually, and passes through the boombox reception of phone usually.

Because this system integration is in cellular telecommunication system inside, this provides greater than the overlay area of using traditional double-direction radio system.The PTT business can utilize the PTT service device in IP Multimedia System (IMS) system to realize.The PTT business is based on multipoint-unicast.Each sends hand-held set and sends packet data traffic to special-purpose PTT service device (participation server).Control Server receives the shared right to speak of this traffic carrying capacity and management group calling.This Control Server duplicates will be by this traffic carrying capacity of all recipients' receptions.In the GPRS access network or on Radio Access Network, do not carry out multicast.

Drafted such as ' the regulation of OMA Push to talk over Cellular (PoC)-Architecture ' and so on such as the Push to talk over Cellular telecommunication system of in Push to talk over Cellular, describing.

Can create the group who utilizes PoC system communication subscriber equipment by different way.The Internet engineer's task groups (IETF) utilizes Session Initiation Protocol or conferencing policy control protocol (CPCP) to define such system.In case set up the group, voice-and-data control traffic carrying capacity is promptly carried by real-time protocol (rtp) stream carrier.This PoC system uses based on the host-host protocol described in the IETF RFC 3550.Real-time Transport Protocol has been described the framework of packet and be stored in the grammer of the data in the voice-and-data packets of information of transmitting from user to user.

On the PoC network, also do not solve confidentiality and anonymous problem.The user of PoC network may wish to send message but their identity do not offered the final destination, and still identity can be passed to one or more go-betweens simultaneously.

Although there is some Session Initiation Protocol, for example setting up the lTEF RFC 3323 and the ITEF RFC 3325 that can make the user that its identity is not provided when IMS connects, the anonymity how data in the PoC network keep the user also is not discussed.

In addition, when the user's request that does not have method to make to have added a group was talked in the group, also request was hidden its identity and is not allowed other member among the group know.This need carry out in to the participation of Push to talk over Cellular (PoC) system and Control Server still sending its identity.In order to stop illegal act to take place when hiding user identity, the transmission of identity allows this group side of being authorized to supervision.

The purpose of embodiments of the present invention is solutions or alleviates the problems referred to above at least.

Summary of the invention

According to the invention provides a kind of communication system, comprising: sharing first and second subscriber equipmenies of communicating by letter on the right to speak; With the server unit that is used to manage this shared right to speak; Wherein this server unit is configured to detect the anonymous request from this first subscriber equipment, and prevents that in response to above-mentioned anonymous request second subscriber equipment from discerning the identity of first subscriber equipment the user-plane message that sends to second subscriber equipment from first subscriber equipment.

First subscriber equipment can be configured to utilize first agreement, and by above-mentioned server unit, initiation is connected with second subscriber equipment.

First agreement can be a Session Initiation Protocol.

First subscriber equipment preferably is configured to utilize second agreement, by above-mentioned server unit, communicates with above-mentioned second subscriber equipment in existing connection.

Second agreement can be real time control protocol (RTCP).

User-plane message preferably utilizes above-mentioned second agreement to send.

Communication system can comprise push-to-talk over cellular communication system.

User-plane message is the right to speak control messages preferably.

User-plane message preferably right to speak obtains message.

User-plane message is media information preferably.

Server unit can be configured to the identity of deletion first user from above-mentioned user-plane message.

Server unit can also be configured to insert unique anonymous mark in above-mentioned user-plane message.

This unique anonymous mark is stored in the above-mentioned user-plane message preferably as at least a portion of information source description entry.

Server unit preferably is configured to therefrom delete first user's identity before above-mentioned user-plane message is sent to second subscriber equipment.

The identification information that can comprise in the display Name of the URI that comprises this subscriber equipment and this subscriber equipment at least one from the user-plane message of first subscriber equipment.

Anonymous request be preferably included in one of following at least in: subtype message; Payload type message; The SDES field of adding in the message; Additional custom fields.

User-plane message is right to speak request or talk request message preferably.

Server unit can comprise Control Server and participate in server that wherein Control Server is configured to receive the anonymous request from first user, is configured to send user-plane message and participate in server.

Control Server preferably is configured to send second user-plane message to above-mentioned participation server, above-mentioned second user-plane message comprises the identity and the confidentiality indication of first subscriber equipment, wherein above-mentioned participation server is configured to receive above-mentioned second user-plane message, and, prevent that second subscriber equipment from discerning the identity of first subscriber equipment in response to the indication of above-mentioned confidentiality.

Second user-plane message confidentiality indication is preferably provided by one of following at least: subtype message; Payload type message; The SDES field of adding in the message; Additional custom fields.

According to a second aspect of the invention, a kind of server unit that is configured to move in communication system is provided, above-mentioned communication system also is included in shares first and second subscriber equipmenies of communicating by letter on the right to speak, wherein above-mentioned server unit is configured to management should share right to speak, and be configured to detect anonymous request, and prevent that in response to above-mentioned anonymous request second subscriber equipment from discerning the identity of first subscriber equipment the user-plane message that sends to second subscriber equipment from first subscriber equipment from first subscriber equipment.

According to a third aspect of the invention we, the subscriber equipment that moves in a kind of communication system that is configured on sharing right to speak is provided, above-mentioned communication system also comprises the server unit that is configured to manage this shared right to speak, and wherein at least one of subscriber equipment is configured to receive from above-mentioned server unit and prevents that this at least one subscriber equipment from discerning the user-plane message of the identity of at least one other subscriber equipment.

According to a forth aspect of the invention, a kind of communication means in the communication system that is included in the server unit of sharing first and second subscriber equipmenies of communicating by letter on the right to speak and be configured to manage this shared right to speak is provided, said method comprises the following steps: to receive at above-mentioned server unit place the anonymous request from first subscriber equipment, prevents that second subscriber equipment from discerning the identity of first subscriber equipment the user-plane message that sends to second subscriber equipment from first subscriber equipment.

According to a fifth aspect of the invention, provide a kind of communication system, having comprised: shared first and second subscriber equipmenies of communicating by letter on the right to speak; With the Control Server that is used to manage this shared right to speak; Be used to serve at least one participation server of above-mentioned second subscriber equipment; Wherein this Control Server is configured to detect the anonymous request from first subscriber equipment, and in from the user-plane message of first subscriber equipment, insert the confidentiality indication, and, this participation server prevents when above-mentioned confidentiality is indicated that second subscriber equipment from discerning the identity of first subscriber equipment when responding.

Description of drawings

In order to understand the present invention better and to realize the present invention, now will be only by means of the mode of example with reference to the accompanying drawings, wherein:

Fig. 1 shows the schematic diagram in conjunction with the representative communication network of embodiment of the present invention;

Fig. 2 shows the schematic diagram of the PTT communication network of realizing in the communication network of Fig. 1;

Fig. 3 shows the flow chart of expression in conjunction with the right to speak control program of first embodiment of the invention;

Fig. 4 shows the RTCP ' talk request in conjunction with first embodiment of the invention ' schematic diagram of packet;

RTCP ' the right to speak that Fig. 5 shows in conjunction with first embodiment of the invention obtains ' schematic diagram of packet; And

Fig. 6 shows the schematic diagram in conjunction with ' PRIV ' information source data of description grouping of another execution mode of the present invention.

Embodiment

To by the mode of example some execution mode of the present invention be described with reference to the exemplary architecture of the third generation (3G mobile communication system).Yet, it is to be understood that execution mode can be applied to the communication system of any other appropriate format.

The benchmark framework that will provide to the user of subscriber equipment the third generation (3G) core network of the access of multimedia service has been provided third generation partner program (3GPP).This core network is divided into three main territories.Circuit switching (CS) territory, packet switching (PS) territory and internet protocol multi-media sub-system (IMS) territory are arranged.

Fig. 1 shows the IP multi-media network 45 that is used to IP multi-media network subscriber that IP multimedia service is provided.IP Multimedia System (IMS) function can multiplely be used to provide core network (CN) subsystem of professional entity to provide by comprising.Third generation partner program (3GPP) has defined the use of the GPRS (GPRS) that is used to the IMS business that IP connectivity is provided.The following example that therefore, will be used for the backbone communications network of possible support IMS business based on the system of GPRS.

Mobile communication system such as the 3G cellular system is configured to serve a plurality of mobile subscriber equipments usually, is normally undertaken by the wave point between the base station of subscriber equipment and communication system.Mobile communication system can logically be divided into Radio Access Network (RAN) and core network (CN).Core-network entities generally includes the various control entity, realizes communication and makes single communication system carry out the gateway that interface is connected with one or more communication systems of other cellular system and/or fixed line communication systems and so on by a plurality of Radio Access Networks with being used for.

In Fig. 1, provide packet switched data transmission in the middle packet-switched domain of mobile communications network between support node 33,42 and mobile subscriber equipment 30,44.Different sub-networks then is connected to outer data network, for example is connected to packet switched data network (PSDN) by Gateway GPRS Support Node (GGSN) 34,40.Thereby gprs service allows transmission of packet data between mobile data terminal and/or the outer data network.More particularly, exemplary universal packet wireless business running environment comprises one or more sub-network service areas, and they are interconnected by GPRS backbone network 32 and 41.Sub-network comprises many group data service nodes (SN).In this embodiment, service node will be called as Serving GPRS Support Node (SGSN).SGSN33,42 each be connected at least one mobile communications network, be typically connected to base station system 31,43.Although for the sake of clarity not shown, this connection can provide by radio network controller or other connecting system controller mode such as base station controller, and by this way, Packet Service can offer mobile subscriber equipment by several base stations.

Base station 31 and 43 is configured to the wave point by separately, sends a signal to the mobile subscriber, i.e. subscriber's mobile subscriber equipment 30 and 44, and received signal therefrom.Correspondingly, each mobile subscriber equipment can send a signal to base station and received signal therefrom by wave point.In the expression that Fig. 1 simplifies, base station 31 and 43 belongs to Radio Access Network (RAN) separately.In the configuration that illustrates, subscriber equipment 30 and 44 each can insert IMS networks 45 by two access networks that are associated with base station 31 and 43 respectively.Recognize that although Fig. 1 only shows the base station of two Radio Access Networks, typical mobile communications network generally includes many Radio Access Networks.

The IMS territory is used to guarantee manage fully multimedia service.The general Session Initiation Protocol of supporting by the Internet engineer's task groups (IETF) exploitation in IMS territory.Session Initiation Protocol is an application layer control protocol that is used for establishment, modification and termination and one or more participant's (terminal point) session.SIP is developed as permission usually and recognizes the session semanteme by making these terminal points, initiates the session between two or more terminal points in the Internet.The user who is connected to based on the communication system of SIP can communicate based on a plurality of entities of standardized sip message and this communication system.The user of subscriber equipment or certain application of operation on subscriber equipment registers to the SIP backbone, so that the invitation of particular session can correctly be submitted to these terminal points.SIP provides login mechanism for equipment and user, and its is used such as the mechanism of location server and register machine and invites with route conversation suitably.The example of the correct possible session that can be provided by the SIP signaling comprises internet multimedia meeting, internet telephone cell and multimedia issue.

Subscriber equipment in Radio Access Network can communicate by radio network information channel and the radio network controller that is commonly referred to wireless carrier.Each subscriber equipment at any one time and have the wireless channel of one or more openings between the radio network controller.Any suitable mobile subscriber equipment of Internet protocol (IP) communication that is applicable to may be used to connect network.For example, the user can rely on the subscriber equipment such as personal computer, personal digital assistant (PDA), travelling carriage (MS), portable computer or its combination or the like to visit cellular network.

Subscriber equipment is used for such as carrying out and receiving call, receive data and send data to network and experience for example task of content of multimedia from network.Usually be equipped with processor and memory to finish these tasks to subscriber equipment.Subscriber equipment can comprise antenna, to send signal from the base station radio ground received signal of mobile communications network and to it.Can also be equipped with display to subscriber equipment, think user's display image and other graphical information of mobile subscriber equipment.Can also be equipped with loud speaker.The operation of subscriber equipment can rely on the control of appropriate users interface, such as keypad, voice command, touch-sensitive screen or touch-sensitive dish and combination thereof or the like.

The subscriber equipment 30 and 44 of Fig. 1 is configured to use the one-key type business.The mobilizing function that the PTT business may need can be by the button on the keypad of travelling carriage 30 and 44, perhaps by providing such as specific keys or button with ' walkie-talkie ' equipment homotype.

Recognize that for the sake of clarity, Fig. 1 only shows two subscriber equipmenies.In fact, many subscriber equipmenies can communicate with each base station simultaneously.Subscriber equipment can carry out the session of several whiles, the PDP Context of for example many SIP sessions and activation.For example, the user can carry out call, and is connected at least one other business simultaneously.

Subscriber equipment in inserting entity is provided by PDP Context with whole communication the between the GGSN.Each PDP Context provides the communication path between specific user and the GGSN.In case set up PDP Context, it can carry a plurality of flows usually.Each flow ordinary representation, for example, the medium composition of specific transactions and/or specific transactions.Therefore PDP Context often represents the logical communication path by one or more flows of network.In order to realize the PDP Context between subscriber equipment and the Serving GPRS Support Node, need to set up the radio access bearer that allows customer equipment data to transmit usually.

The development of communication system makes can to rely on by network entity and handles and provided the difference in functionality of the IMS network 45 of service to provide professional for subscriber equipment by server.In the present 3G radio multimedium network architecture, suppose that several different servers are used to handle different functions.This has comprised the function such as CSCF (CSCF) and so on.CSCF can be divided into different kinds, such as Proxy Call Session Control Function (P-CSCF) 35,39, and enquiry call conversation control function (I-CSCF) 37 and service call conversation control function (S-CSCF) 36,38.

Subscriber equipment 30,44 can be connected to the application server that is connected with IMS usually by GPRS network.In Fig. 1, this application server is provided by Push to talk over Cellular (PoC) service server 50.In some embodiments of the present invention, this PoC server can be implemented as the server unit that comprises a series of participation PoC servers that are connected with control PoC server.Participate in the PoC server and send and receive data business volume, also send and receive data business volume from control PoC server from subscriber equipment.Control PoC server is from participating in the PoC server and send and receive data business volume, and depends on from participating in information Control that server receives and share the visit of right to speak to PoC.In yet another embodiment of the present invention, one participates in the effect that the PoC server also plays control PoC server.

Fig. 2 shows the further diagrammatic sketch about the communication system of Fig. 1 of Push to talk over Cellular (PoC) system.Fig. 2 shows by user equipment unit UE1 30, the UE2 44 of Push to talk over Cellular telecommunication system communication, the network of UE3 102, UE4 104.UE1 30 is connected to first and participates in PoC server 101, and it is connected with control PoC server 50.UE2 44 is connected to and controls the second participation PoC server 103 that PoC server 50 is connected.UE3 102 is connected to and controls the 3rd participation PoC server 105 that PoC server 50 is connected.UE4104 is connected to and controls the 4th participation PoC server 107 that PoC server 50 is connected.In such system, mobile subscriber equipment UE1, UE2, UE3 and UE4 can be from four different IMS networks.

PoC participates in server 101,103,105,107 and control PoC server 50 provides Push to talk over Cellular (PoC) business by IMS network 45.The PTT business is the so-called directly example of voice communication service.Wish to use the user of this PoC service may need to be subscribed to suitable substance P oC server.

Directly voice communication service is to be used for utilizing GPRS backbone's the performance and the controlled function of IP multimedia subsystem, IMS, is connected with the IP of user equipment (UE) 1 30, UE2 44, UE3 102, UE4 104 with realization.The PoC server can be operated by the operator or the third party service provider of IMS system.

The user can open communication linkage, for example, and by pressing the specific activator button on the user equipment (UE) 1 30.When the user of UE1 30 talked, the user of UE2 44, UE3 102 and UE4104 listened.Then, the user of user equipment (UE) 2 44 can answer in a similar fashion.Signaling between subscriber equipment and the suitable CSCF is by the GPRS network route.User plane session is that subscriber equipment is set up signaling, and by participation PoC server 101,103,105,107 routes, and by 50 controls of control PoC server.In other words, the PoC server controls PoC user's control plane (for signaling) and user plane (for user data).The control plane traffic carrying capacity that participates between PoC server and the subscriber equipment can be passed through the IMS route, and the user-plane traffic amount between subscriber equipment and the PoC server is routed to PoC server (as shown in fig. 1) from gprs system on interface 54 and 56 simultaneously.

As mentioned above, the PTT business is based on multipoint-unicast.Each sends user equipment (UE) 1 30, UE2 44, UE3 102, UE4 104 transmission packet data traffic to the PTT private server, and under the situation of groupcall, server duplicates this traffic carrying capacity for all recipients subsequently.In order to control communication system, ' user plane ' message can be delivered to the remainder of system from a user, and vice versa.One of data communication packets type is to notify which user sending or which user has received the permission of using right to speak in the user plane.This information can be ' right to speak obtains ' message.This ' right to speak obtains ' information is to be received by the subscriber equipment that will receive from the user's who has controlled right to speak RTP traffic carrying capacity.These control groupings are based on the subclass of previously described real time control protocol (RTCP) grouping, real-time protocol (rtp).

In order to help to understand the present invention, user UE1 30, UE2 44, UE3 102, UE4 104 are relevant with a group communication with describing, and use the user of user equipment (UE) 4 104 to wish speech, and ask its other party is hidden the situation of its identity simultaneously.

About Fig. 3, show the flow chart of describing one embodiment of the present invention operation.For the sake of clarity, the PoC customer end A refers to user equipment (UE) 4 104 in this example, participate in the PoC server A and refer to participate in PoC server 107, control PoC server X accuses system PoC server 50, the PoC server B refers to that first participates in PoC server 101, and the PoC customer end B refers to corresponding user equipment UE1 30.Although described One-to-one communication in this example, recognize that same method can be applied to control the one-to-many communication of PoC server for each recipient's copy message.

In first step 201, PoC customer end A 104 sends ' talk request ' message and gives participation PoC server A 107.This ' talk request ' message comprises the speaker or the user identity of customer end A, and anonymous request.

Second step 203 takes place after participation PoC server A 107 has received this talk request.In this step, participation PoC server A 107 will comprise that ' talk request ' of speaker identity and anonymous request is transmitted to control PoC server X50.

Control PoC server X50 can carry out the authentication of client, to determine that this client is participated in this PoC communication group by approval.If allow 104 speeches of PoC customer end A, promptly there is not other user to occupy right to speak, then control PoC server X50 and initiate the first step 205 and second step 207.

The first step 205 that control PoC server is initiated is that control PoC server X50 gives ' right to speak an obtains ' forwards and participates in PoC server B 101.This ' right to speak obtains ' message comprises speaker identity and the anonymous request from customer end A 104.

Second step 207 that control PoC server is initiated is that control PoC server X50 sends to ' speech is authorized ' message and participates in PoC server A 107.In other execution mode of the present invention, control PoC server X50 sends one by system's ' right to speak mandate ' message to handle with mode like ' speech is authorized ' classes of messages.In the step 209 below, participate in the PoC server A and send ' speech is authorized ' message that previous steps receives to PoC customer end A 104.This ' speech authorize ' message allows customer end A to send speech burst in this group, promptly broadcasts it to this group and wants any message of sending.

Participating in PoC server B 101 receives from ' right to speak obtains ' message that comprises speaker identity and anonymous request information of controlling PoC server X50.Participate in the identity that PoC server B 101 is discerned these anonymous request and delete speaker from this ' right to speak obtains ' message.Participate in PoC server B 101 and in step 251, generate new ' right to speak an obtains ' message.Then, this does not comprise new ' right to speak obtains ' message of User Recognition feature to 30 transmissions of PoC customer end B in step 211 to participate in PoC server B 101.

About Figure 4 and 5, show the example of ' talk request ' and ' right to speak obtains ' message that comprises speaker identity and anonymous request.

About Fig. 4, show based on real time control protocol (RTCP) in conjunction with first embodiment of the invention, such as the grouping that is used for transmitting ' talk request ' packet.

Should ' talk request ' RTCP grouping send to participation PoC server 107, and, be transmitted to control PoC server X50 by participating in PoC server A 107 in order to allow to send other user that talks from the Control Server request from PoC customer end A 104.

This ' talk request ' RTCP grouping comprises the datagram of 32 bit widths.First row of this datagram comprises a series of values of information, version indicator (V) 303 (2 bit), filling bit (P) (1 bit) 305, information source counting 307A (5 bit), PT Payload Type (PT) (8 bit) 309, and length indicator (LENGTH) 311.

As defined in IETF RFC 3,550 6.5 joints, the version of the RTP that version indicator 303 indicates to use is version 2 in this example.Whether filling bit 305 these groupings of expression comprise one or more filling eight hytes.It is any subtype of multiple RTCP grouping that the information source counting is used for identifying the present grouping of definition.In the example shown in Figure 4, this is amended ' talk request ' RTCP grouping for value 10000 expressions, and this modification is that the user of this talk request of request wishes other user of this group is kept anonymous.PT Payload Type (PT) 107 has defined the form of RTCP payload, and in shown example, PT Payload Type equals APP or 204.Length indicator (LENGTH) 311 with the WD of 32 bits length that should grouping, do not count first word.In this example, length equals two 32 other bit words.

Second row of this datagram comprises synchronous source identifier (SSRC) 313, it be this grouping originator synchronous information source.In shown example, this grouping is ' talk request ' grouping, and SSRC 313 is identifiers of PoC customer end A 104.

The third line and last column of this RTCP grouping are included as the shown address of this subscriber equipment ' title ' 315.Should ' title ' field also can be used for expression application released version.

When step 201 finishes, in case being participated in server A, this grouping receives, then in step 203, this packet forward given control PoC server X50.

About Fig. 5, show based on real time control protocol (RTCP) in conjunction with first embodiment of the invention, such as the grouping that is used for transmitting ' right to speak obtains ' message data packet.

According to previously described method, used ' right to speak obtains ' message of two types.' right to speak obtains ' RTCP grouping of first type sends to from control PoC server 50 by network and participates in the PoC server, for example first participates in PoC server 103.Second type sends to subscriber equipment from participating in the PoC server, UE130 for example, and allow subscriber equipment prepare to receive RTP grouping from the subscriber equipment that obtains the right to speak mandate.First kind and second type can both be described about Fig. 5.

' right to speak obtains ' RTCP grouping comprises that width is the datagram of 32 bits.

First row of this datagram comprises a series of values of information, version indicator (V) 303 (2 bit), filling bit (P) (1 bit) 305, information source counting (5 bit) 307b, PT Payload Type (PT) (8 bit) 309, and length indicator (length) 311b.

As defined in IETF RFC 3,550 6.5 joints, the version of the RTP that version indicator 303 indicates to use is version 2 in this example.Whether filling bit 305 these groupings of expression comprise one or more filling eight hytes.It is any subtype of multiple RTCP grouping that information source counting 307b is used for identifying the present grouping of definition.In the example shown in Figure 5, this is amended ' right to speak obtains ' RTCP grouping for value 10010 expressions, and wherein the user asks anonymity (comparing with the subtype 00010 of ' right to speak obtains ' RTCP grouping of representing rule).PT Payload Type (PT) 309 has defined the form of RTCP payload, and in shown example, PT Payload Type equals APP or 204.Length indicator (length) 109 with the WD of 32 bits length that should grouping, do not count first word.

Second row of this datagram comprises a synchronous source identifier (SSRC) 313b, and it discerns synchronous information source for the originators of this grouping.In shown example, this grouping is one amended ' right to speak obtains ' grouping, and SSRC 313b is the identifier of control PoC server 50.

The third line of this RTCP grouping is included as address (title) 315b that Push to talk over Cellular (PoC) server shows.Should ' title ' field also can be used for expression application released version.

The fourth line of this grouping and other row comprise a block of information 317.

For ' right to speak obtains ' message of first type, this block of information comprises two information sources descriptions (SDES) item.

The first information source description entry 321 comprises the title (CNAME) of standard.The title of this standard comprises the title of user 323 standard.The title of user 323 standard is defined as the unique identifier of distributing to this user/subscriber equipment combination.The example of such unique identifier is a SIP unified resource designator (URI), than as shown in Figure 5

‘dave.bowman@poc.operator.com’。

The second information source description entry 325 comprises display Name (name).This display Name comprises user 327 display Name.User 327 display Name is shown, is represented the identifier of this user/subscriber equipment combination by this subscriber equipment.The example of such identifier is an alphanumeric character string, than ' DaveB ' as shown in Figure 5.

Received right to speak and obtain anonymous grouping in case participate in PoC server B 103, participating in then that the PoC server B handles should ' right to speak obtains ' message, with the title (CNAME) and the display Name (NAME) of the standard of deleting this user.In some execution mode of the present invention, CNAME and NAME value can provide unique anonymous title.In this case, may keep its anonymity, but the authorized party still can be with this message linkage to the specific user who provides particular kind of relationship between unique anonymous title and the user's name to the user.

In other execution mode of the present invention, the subtype of ' right to speak obtains ' message is returned to the normal-sub type of ' right to speak obtains ' message.In such execution mode, might prevent that therefore the subscriber equipment that receives from detecting the transmission subscriber equipment and having asked anonymity.

In these cases, it is anonymous that the user can keep in face of other client and subscriber equipment after request, but still can be in the side's of the being authorized to supervision of controller place.

Although, recognize that designator can be positioned at the other parts of right to speak control messages in other execution mode of the present invention in the sub-type field of RTCP right to speak control grouping by the example of anonymous request above having described is provided.

In another embodiment, anonymous request is represented by using amended PT Payload Type.Control PoC server and participation PoC server can be discerned this amended PT Payload Type so that required anonymity to be provided.

In another embodiment, anonymous request can by provide with from the anonymous of this user or optionally the additional SEDS field that combines of identity represent.

In the other execution mode of the present invention, the anonymous request in the right to speak control messages can be represented by increasing extra custom fields to this grouping.

Comprise in the example of additional SDES field of anonymous identity in increase, send to the SDES field that ' right to speak obtains ' message bearing of first type participating in PoC server B 103 anonymous information and comprised user's anonymous ID from control PoC server 50.Only comprise anonymous information from participating in PoC server 103 to second type of ' right to speak obtains ' message that receives PoC client 30, promptly this user's ID is deleted before being forwarded to PoC customer end B 30.

In the other execution mode of the present invention, anonymous or optional identity is not provided as additional SDES field, but combines with original SDES field information in order to form composite S DES field.For example, display Name in ' right to speak obtains ' message of first type can comprise data, " title +++anonymous ID ", wherein ' title ' is this user's display Name, character string ' +++' be separator, and ' anonymous ID ' sends to other user's title in second type of ' right to speak obtains ' message.

In the other execution mode of the present invention, anonymous information or grouping or element strengthen on the basis of known ' right to speak obtains ' grouping to some extent.In this embodiment, comprise that first ' right to speak obtains ' RTCP grouping of the information source descriptor of the user's name that comprises standard and explicit user title combines with second grouping that comprises anonymous information, divide into groups to form compound RTCP.

In another embodiment of the present invention, ' right to speak obtains ' as known in the art RTCP grouping back directly and then comprises the 2nd RTCP grouping of anonymous information.This second grouping is that the real time control protocol of being scheduled to (RTCP) is used (APP) grouping.

In another embodiment, anonymous identifier information source description entry PRIV produces the specific proprietary extensions of PoC of this anonymous information of transmission.

With reference to figure 6, it shows the example of the PRIV message grouping that comprises anonymous information.This PRIV grouping 501 comprises and comprises this anonymous information, i.e. the value character string 503 of designator and/or any anonymous ID.

In the other execution mode of the present invention, the title of user's standard can be this user's Tel URL/URI.This Tel URL/URI is the SIP that is equivalent to the subscriber equipment telephone number that uses in the PSTN (PSTN).

In the other execution mode of the present invention, control PoC server remembers that this user has asked anonymous situation during the user initiates.This request can utilize the Session Initiation Protocol of describing in IETF RFC3325 and/or the IETF RFC3323 to realize.In this embodiment, control PoC server is checked any speech or right to speak request message, and request that should the user uses confidentiality, receives ' talk request ' message that comprises anonymous request if promptly control the PoC server, then sends ' right to speak obtains ' message.

Embodiments of the present invention can use other type the right to speak control messages or even can use the message of other type, described information is provided.The example of other kind of message comprises media information.

Embodiments of the present invention can also be used other agreement that is different from RTCP, to send user and control plane message.

In the other execution mode of the present invention, wherein Control Server sends to the subscriber equipment of being served by the participation server in the trusted network not, control PoC server is finished the task of removing any recognition feature from forwarding message forwarding the message to before trusted network participates on the server.

In other execution mode of the present invention, subscriber equipment can send the anonymity value as user's display Name.In these execution modes, system is configured to remove anonymous value, but transmits this value simply.Thereby in such system, the user still keeps its confidentiality.

Claims (26)

1. communication system comprises:

Sharing first and second subscriber equipmenies of communicating by letter on the right to speak; And

Be used to manage the server unit of this shared right to speak;

Wherein, this server unit is configured to detect the anonymous request from this first subscriber equipment, and

Wherein, in response to described anonymous request, this server unit is configured to prevent that this second subscriber equipment from sending to the identity of this first subscriber equipment of identification at least one user-plane message of this second subscriber equipment from this first subscriber equipment.

2. system according to claim 1, wherein this first user device configuration is to utilize first agreement to initiate and being connected of this second subscriber equipment by described server unit.

3. communication system according to claim 2, wherein said first agreement comprises Session Initiation Protocol.

4. system according to claim 1, wherein this first user device configuration communicates with described second subscriber equipment in existing connection by described server unit for utilizing first agreement.

5. system according to claim 4, wherein said second agreement comprises real time control protocol (RTCP).

6. system according to claim 4, wherein said at least one user-plane message utilize described second agreement to send.

7. system according to claim 1, wherein said communication system comprises push-to-talk over cellular communication system.

8. system according to claim 7, wherein said at least one user-plane message comprises the right to speak control messages.

9. system according to claim 8, wherein said at least one user-plane message comprises that right to speak obtains message.

10. system according to claim 7, wherein said at least one user-plane message comprises media information.

11. system according to claim 8, wherein said server unit is configured to the sign of this first user of deletion from described at least one user-plane message.

12. system according to claim 11, wherein said server unit also is configured to insert unique anonymous mark in described at least one user-plane message.

13. system according to claim 12, wherein said unique anonymous mark is stored in described at least one user-plane message as at least a portion of information source description entry.

14. system according to claim 1, wherein said server unit is configured to therefrom delete this first user's sign before described at least one user-plane message is sent to this second subscriber equipment.

15. system according to claim 1, wherein said at least one user-plane message from this first subscriber equipment comprise in the display Name of the unified resource identifier (URI) that comprises this first subscriber equipment and this first subscriber equipment the identification information of at least one.

16. system according to claim 1, wherein this anonymous request is included in following at least one:

The subtype of this at least one user-plane message;

The PT Payload Type of this at least one user-plane message;

Additional information source in this at least one user-plane message is described (SDES) field; And

Additional custom fields.

17. system according to claim 1, wherein said at least one user-plane message comprises right to speak request or talk request message.

18. system according to claim 1, wherein this server unit comprises:

Control Server; With

Participate in server, wherein this Control Server is configured to receive this anonymous request from this first subscriber equipment, and wherein this participation server is configured to send this at least one user-plane message.

19. system according to claim 18, wherein this Control Server is configured to send second user-plane message to described participation server, described second user-plane message comprises the identity and the confidentiality indication of this first subscriber equipment, wherein said participation server is configured to receive described second user-plane message, and, prevent that this second subscriber equipment from discerning the identity of this first subscriber equipment in response to the indication of described confidentiality.

20. system according to claim 18, the indication of the wherein said second user-plane message confidentiality is provided by one of following at least:

The subtype of this second user-plane message;

The PT Payload Type of this second user-plane message;

The SDES field of adding in this second user-plane message;

Additional custom fields.

21. also being included in, a server unit that is configured to move, described communication system share first subscriber equipment and second subscriber equipment of communicating by letter on the right to speak in communication system, wherein:

Described server unit is configured to manage shared right to speak, to detect anonymous request from this first subscriber equipment, and, prevent that this second subscriber equipment from sending to the identity of this first subscriber equipment of identification at least one user-plane message of this second subscriber equipment from this first subscriber equipment in response to described anonymous request.

22. the subscriber equipment that moves in the communication system that a kind is configured on sharing right to speak, described communication system comprises:

This subscriber equipment; With

Be configured to manage the server unit of this shared right to speak, wherein at least one of this subscriber equipment is configured to receive from described server unit and prevents that this at least one subscriber equipment from discerning the user-plane message of the identity of at least one other subscriber equipment.

Share first and second subscriber equipmenies of communicating by letter on the right to speak and the server unit that is configured to manage this shared right to speak 23. a method for communicating in communication system, this communication system are included in, described method comprises the following steps:

In the anonymous request of described server unit place reception from this first subscriber equipment; And

Prevent that this second subscriber equipment from sending to the identity of this first subscriber equipment of identification at least one user-plane message of this second subscriber equipment from this first subscriber equipment.

24. a communication system comprises:

Sharing first and second subscriber equipmenies of communicating by letter on the right to speak;

Be used to manage the Control Server of this shared right to speak; And

At least one is used to described second subscriber equipment that the participation server of service is provided,

Wherein this Control Server is configured to detect the anonymous request from this first subscriber equipment, in from the user-plane message of this first subscriber equipment, insert the confidentiality indication, and, when at least one participates in server and responds described confidentiality indication when this, prevent that this second subscriber equipment from discerning the identity of this first subscriber equipment.

25. also being included in, a server that is configured to move, described communication system share first and second subscriber equipmenies of communicating by letter on the right to speak in communication system,

Wherein said server is configured to manage shared right to speak, to detect anonymous request from this first subscriber equipment, and, prevent that this second subscriber equipment from sending to the identity of this first subscriber equipment of identification at least one user-plane message of this second subscriber equipment from this first subscriber equipment in response to described anonymous request.

26. the subscriber equipment that moves in the communication system that a kind is configured on sharing right to speak, described communication system comprises:

Be configured to manage the server of this shared right to speak, wherein at least one of this subscriber equipment is configured to receive from described server and prevents that this at least one subscriber equipment from discerning the user-plane message of the identity of at least one other subscriber equipment.

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