CN1870821A - Mobile session control equipment and mobile communication network and speech path establishing method - Google Patents
Mobile session control equipment and mobile communication network and speech path establishing method Download PDFInfo
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Abstract
The invention discloses mobile session control equipments including: a call control unit, a resource controlling unit, a wireless network interface unit and MRS access unit. The invention also discloses mobile communication networks including a conversation control equipment, in which, the main network entities include base station equipments, mobile stations, a HLR, an access location register and media subsystems (MRS) etc. in which, said conversation control equipment and MRS communicate to each other by the application of the new interface information exchange agreement to assist to complete media resources operating functions. The invention also discloses a method for setting up traffic loading to apply media resources to MRS by the mobile session control device and puts the media resource into the loading traffic.
Description
Technical field
The present invention relates to moving communicating field, relate in particular to mobile session control equipment, mobile communications network and speech path establishing method under a kind of Access Network and the core net interface IPization situation.
Background technology
The mobile communications network development is carried continuous evolution by the traditional circuit carrying to whole IP so far, and the framework that carrying separates with control has been introduced in circuit (CS) territory.With CDMA2000 is example, mobile switching centre originally (Mobile Switch Center, MSC) be divided into mobile soft switch (Mobile Switch CenterEmulation, MSCe) and media gateway (Media GateWay, MGW) two equipment are respectively applied for signaling control and carrying and handle.Wherein, the functional module of MSCe comprises: with the base station carry out information interaction Base station Interface Unit, realize to call out control Call Control Unit, realize resource allocation and scheduled resources control unit and with the mutual media gateway interface unit of media gateway.
After Access Network and the core net interface IPization, the base station (Base Station, BS) and the A1p interface signaling between the MSCe and the A2p media bearer interface data between BS and the MGW all be carried on the IP network.The network site of related functional entities and interface annexation as shown in Figure 1, wherein, A2p not only provides the bearer path between BS and the MGW, the IP bearer path between BS and the BS is also provided by A2p; As shown in the figure, identified BS1 to the bearer path of BS2 by way of MGW1, MGW2.
The function of MGW can be divided into two classes substantially:
(1) be subordinated to MSCe, cooperate MSCe to finish the relevant carrying of resource and handle, as playback, DTMF detects and reports, and inserts conferencing resource, and (Interworking Function, IWF) resource are inserted codec etc. to insert interlink server.
(2) be subordinated to MSCe, finish the termination and the conversion of dissimilar Media Streams, as provide between the CDMA of IPization circuit-domain network and the traditional PSTN IP and TDM the carrying between conversion.
Be that example is described existing technical scheme with a typical mobile soft switch station to station call flow process below, as shown in Figure 2.For the purpose of convenient, suppose that the A2p bearing parameter of Calling Side BS passes to Calling Side MSCe in CM service request (CM Service Request) message, the A2p bearing parameter of callee side BS is passed to callee side MSCe in page response (Paging Response) message, ring-back tone is provided by callee side, and idiographic flow is:
1, MSCe1 receives the CM Service Request message that BS1 sends, and wherein carries A2p bearing parameter [2], mainly comprises the coded format tabulation of BS1 side expectation, the IP address of the last bearer connection endpoint of BS1, port numbers;
2, MSCe1 issues ADD message to MGW1, and request distributes two RTP type end points, respectively the bearer connection endpoint of corresponding BS1 side and callee side;
3, MSCe1 receives the REPLY message that MGW1 returns, and wherein carries the SDP information of two good RTP end points of application, mainly comprises the coded format that MGW1 supports respectively, the IP address of end points separately, port numbers;
4, MSCe1 sends INVITE to MSCe2, carries the SDP[4 of the RTP end points of the corresponding callee side of MGW1];
5, MSCe1 sends Assignment Request message to BS1 request distribution interface-free resources, carries the A2p bearing parameter [3] of the RTP end points of the corresponding BS1 side of MGW1;
6, after interface-free resources was set up and finished, MSCe1 received the Assignment Complete message that BS1 sends;
7, find called position after, MSCe2 sends Paging Request message to BS2, can carry the coded format tabulation that obtains from Calling Side;
8, MSCe2 receives the Paging Response message that BS2 returns, and wherein carries the A2p parameter [7] of BS2 side, comprises the coded format that the BS2 side joint is subjected to, the IP address of the last bearer connection endpoint of BS2, port numbers;
9, MSCe2 issues ADD message to MGW2, and request distributes two RTP type end points, respectively the bearer connection endpoint of corresponding BS2 side and Calling Side;
10, MSCe2 receives the REPLY message that MGW2 returns, and wherein carries the SDP information of two good RTP end points of application, mainly comprises the coded format that MGW2 supports respectively, the IP address of end points separately, port numbers;
11, MSCe2 sends Assignment Request message to BS2 request distribution interface-free resources, carries the A2p bearing parameter [6] of the RTP end points of the corresponding BS2 side of MGW2;
12, after interface-free resources was set up and finished, MSCe2 received the Assignment Complete message that BS2 sends;
13, MSCe1 receives 180 message that MSCe2 returns, and wherein carries the SDP[5 that MGW2 goes up corresponding Calling Side end points];
14, MSCe2 issues MODIFY message to MGW2, and request is put ring-back tone to the RTP end points of corresponding Calling Side;
15, MSCe2 receives the REPLY message that MGW2 returns;
16, the PRACK message of MSCe1 transmission 180 is to MSCe2;
17, MSCe1 receives the 200OK response of PRACK message;
18, MSCe1 issues MODIFY message to MGW1, the Remote SDP of callee side end points [4] is updated to the SDP[5 of the last corresponding Calling Side end points of MGW2 that band is come in 180 message];
19, MSCe1 receives the REPLY message that MGW1 returns;
20, MGW2 sets up to calling subscriber's unidirectional ring-back tone data flow;
21, MSCe2 receives the Connect message indication called subscriber answer of BS2;
22, MSCe2 issues MODIFY (modification) message to MGW2, and request stops playing RBT to the RTP end points near Calling Side;
23, MSCe2 receives the REPLY message that MGW2 returns;
24, MSCe1 receives the 200 OK response of the INVITE that MSCe2 returns;
25, MSCe1 issues MODIFY message to MGW1, is two-way with the Media Stream attribute modification of callee side end points;
26, MSCe1 receives the REPLY message that MGW1 returns;
27, MSCe1 returns ACK message to MSCe2;
28, bi-directional bearers foundation is finished between the calling and called user;
29, behind the end of conversation, called subscriber's on-hook, MSCe2 receives the Clear Request message that BS2 sends;
30, MSCe2 sends Clear Command message to BS2;
31, MSCe1 receives the BYE message that MSCe2 sends;
32, MSCe1 sends Clear Command message to BS1;
33, MSCe1 receives the Clear Complete message that BS1 returns;
34, MSCe1 sends the 200 OK response messages of BYE to MSCe2;
35, MSCe1 issues SUBSTRACT message to MGW1, discharges the RTP end points that this calling takies;
36, MSCe1 receives the REPLY message that MGW1 returns;
37, MSCe2 receives the Clear Complete message that BS2 returns;
38, MSCe2 issues SUBSTRACT message to MGW2, discharges the RTP end points that this calling takies;
39, MSCe2 receives the REPLY message that MGW2 returns.
From above-mentioned call flow as can be seen, in calling procedure, MGW is present in the bearer path all the time, when MSCe judges operation such as the media resource that need carry out playback, issue H.248 message and the endpoint resources of having distributed is carried out corresponding operating to the MGW that is controlled.
Because BS can provide IP bearing interface A2p at present, along with increasing operator tends to net interior Unified coding form and encode/decode-free operation (the Transcoder Free Operation of using, TrFO) realization of function provides the demand of codec (TC) fewer and feweri by MGW in net.But in above-mentioned prior art flow process, even identical coded format is used at the calling two ends of IPization mobile communication circuit-domain network inside, bearer path still must be by MGW in the communication process, and unnecessary jumping figure has increased the time-delay of packet on the bearer path, is unfavorable for the raising of voice quality.
In addition, in the existing techniques in realizing, playback, dual-tone multifrequency (Dual Tone Multi-Frequency, DTMF) detecting operations such as reporting, insert conferencing resource, insertion coded conversion device (TC) resource is finished by MSCe control MGW, between MSCe and the MGW because have a master slave relation, media resource on the MGW is difficult in distributed share in the network, to the expansion of these resources with refresh very difficulty, maintenance cost height.
Summary of the invention
The invention provides a kind of mobile session control equipment, mobile communications network and speech path establishing method, in order to solve in the prior art because the resource updates that the master slave relation of mobile soft switch (MSCe) and media gateway (MGW) causes expansion difficult problem; For calling out between the mobile subscriber in the net, speech path is set up without MGW, in order to solve in the prior art owing to packet must produce time-delay, the problem of voice quality difference through MGW.
Mobile session control equipment provided by the invention, comprise: Call Control Unit, resource control unit and radio network interface unit, also comprise media resource subsystem interface unit, adopt peer protocol and media resource subsystem mutual, carry out application, operation and the release of media resource.
Described peer protocol is session initiation protocol, H.323 agreement or call-independent control protocol bearing.
Described mobile session control equipment is applied in CDMA 2000 networks, realizes the mobile Softswitch corresponding function in the network.
The invention provides a kind of mobile communications network, comprising: base station equipment, travelling carriage, attaching position register, VLR Visitor Location Register; Also comprise media resource subsystem and mobile session control equipment with media resource operating function;
Described mobile session control equipment comprises Call Control Unit, resource control unit, radio network interface unit and media resource subsystem interface unit;
Described travelling carriage is linked in the described base station equipment, interconnects between described mobile session control equipment, VLR Visitor Location Register and the attaching position register;
Described mobile session control equipment adopts the peer protocol interactive information by described media resource subsystem interface unit and described media resource subsystem, carries out application, operation and the release of media resource;
Described mobile session control equipment and described media resource subsystem are connected to the IP bearer network by interface respectively, realize the information interaction with other network entity.
The media resource operating function that described media resource subsystem has comprises at least: playback, dual-tone multifrequency detect and report, insert conferencing resource, insert codec and insert interlink server resource one of them or its combination in any function.
According to above-mentioned network of the present invention, also comprise gateway MSC mobile switching centre and media gateway, described mobile switching centre receives the output signal of Home Network and the input signal of outer net by the IP bearer network, realize the interconnection between the heterogeneous networks, and the conversion of bearer types when controlling described media gateway and carrying out the heterogeneous networks interconnection.
Connect for multi-to-multi between described mobile session control equipment and the described media resource subsystem.
Bearing interface on the described base station adopts IP agreement carrying data or signaling message.
Described base station has IP carrying quality testing and reporting module, carries out IP carrying quality testing and reports described mobile session control equipment.
The present invention provides a kind of speech path establishing method in addition, be applied to the foundation of the speech path between the mobile subscriber in the mobile communications network provided by the invention, this method comprises: when needing to use media resource in the calling procedure, control described media resource subsystem by described mobile session control equipment and carry out the media resource operation, media resource is inserted in the call bearer path;
When not needing to use media resource, directly setting up the call bearer path under the calling and called between the base station.
According to said method of the present invention, describedly carry out the media resource operation by mobile session control equipment control media resource subsystem, media resource is inserted in the call bearer path, specifically comprise:
Initiate to obtain the media resource request to described media resource subsystem according to call logic by described mobile session control equipment, apply for required resource end points;
Described media resource subsystem returns the beared information of resource end points and gives described mobile session control equipment;
Described mobile session control equipment passes to the carrying end that need be attached thereto respectively with the beared information of the resource end points that obtains, and the media resource that described media resource subsystem is provided is inserted in the bearer path.
When media resource is finished using, initiate resource by described mobile session control equipment to described media resource subsystem and discharge main request, discharge described media resource.
In call establishment,, control described media resource subsystem the playback resource is inserted in the bearer path by the information interaction between initiation of the mobile session control equipment under calling local terminal or the opposite end and the described media resource subsystem.
According to said method of the present invention, if, realize comprising the steps: to the local terminal playback by mobile session control equipment initiation under the calling opposite end and the information interaction between the described media resource subsystem
Mobile session control equipment under A1, the calling opposite end sends a request message to described media resource subsystem and applies for the playback end points, carries the bearing parameter information of calling out bearer connection endpoint on the local terminal base station;
B1, the mobile session control equipment of described media resource subsystem under the calling opposite end return response message, carry the SDP information of playback end points on the media resource subsystem, and the mobile session control equipment under the described calling opposite end is replied acknowledge message;
The mobile session control equipment of mobile session control equipment under the calling local terminal under C1, the calling opposite end sends updating message, the bearing parameter information of carrying playback end points on the media resource subsystem that obtains in the B1 step; Call out the mobile session control equipment of the affiliated mobile session control equipment of local terminal under the calling opposite end and return response message;
Mobile session control equipment under D1, the calling local terminal sends the bearer update request message to calling out the local terminal base station, carries the bearing parameter of playback end points on the media resource subsystem, requires this base station to upgrade its bearing parameter; After parameter update was carried out in described base station, the mobile session control equipment under the calling local terminal returned the bearer update response message;
E1, described media resource subsystem are set up to the playback unidirectional traffic of calling out this end subscriber.
According to said method of the present invention, if, realize comprising the steps: to the local terminal playback by mobile session control equipment initiation under the calling local terminal and the information interaction between the described media resource subsystem
Mobile session control equipment under A2, the calling local terminal sends a request message to described media resource subsystem and applies for the playback end points, carries the bearing parameter information of calling out bearer connection endpoint on the local terminal base station;
B2, the mobile session control equipment of described media resource subsystem under the calling local terminal return response message, carry the SDP information of playback end points on the media resource subsystem, call out the affiliated mobile session control equipment of local terminal and reply acknowledge message;
Mobile session control equipment under C2, the calling local terminal sends the bearer update request message to calling out the local terminal base station, and the bearing parameter information of carrying playback end points on the media resource subsystem that obtains in the B2 step requires the base station to upgrade its bearing parameter; After parameter update was carried out in described base station, the mobile session control equipment under the calling local terminal returned the bearer update response message;
D2, described media resource subsystem are set up to the playback unidirectional traffic of this end subscriber.
When caller access side adopts identical data encoding format with called access side, set up the call bearer path between the calling and called, specifically comprise:
A3, caller beginning exhale, and finish the Calling Side assignment procedure;
B3, set up called route, paging is called, finishes the callee side assignment procedure, and the callee side mobile session control equipment obtains the bearing parameter of bearer connection endpoint on the Calling Side base station;
C3, callee side or Calling Side mobile session control equipment and described media resource subsystem are initiated the playback request alternately, described media resource subsystem obtains the bearing parameter of bearer connection endpoint on the Calling Side base station, the Calling Side base station obtains the playback end points bearing parameter on the described media resource subsystem and is updated to this locality, the media resource subsystem is set up to calling subscriber's playback data flow, to calling audio playback;
Behind D3, the called party answer, the mobile session control equipment and the described media resource subsystem of initiating the playback request discharge the playback resource alternately;
E3, Calling Side base station obtain the bearing parameter information of bearer connection endpoint on the base station, called place and are updated to this locality, set up the speech path between the affiliated base station of calling and called.
If it is different with the coded format that called access side adopts that caller inserts side, when setting up the call bearer path between the calling and called, undertaken alternately by callee side or Calling Side mobile session control equipment and described media resource subsystem, codec resource in the application media resource subsystem, and by renewal to calling two ends bearing parameter, described codec resource is inserted in the call path, carries out the conversion of the different code/decode formats in both sides.
According to said method of the present invention, the affiliated base station of calling and called is also carried quality testing and is reported, and concrete grammar comprises:
The carrying quality of bearer path is detected in a1, base station, sends carrying quality situation reporting message to described mobile session control equipment;
After b1, mobile session control equipment are received the carrying quality situation reporting message of base station transmission, return carrying quality situation and report response message.
Among the described step a1, when the base station sends carrying quality situation reporting message, start a timer;
Among the described step b1, after the base station receives that carrying quality situation reports response message, stop described timer; If timer expiry is then retransmitted carrying quality situation reporting message and is restarted described timer.
Reach predefined number of times if retransmit carrying quality situation reporting message number of times, then stop to send described carrying quality situation reporting message.
According to said method of the present invention, the affiliated base station of calling and called is also carried quality testing and is reported, and concrete grammar comprises:
A2, mobile session control equipment send carrying quality situation and report request message to the base station, and request reports the carrying situation;
B2, base station send to mobile session control equipment with detected carrying quality situation structure carrying quality situation reporting message;
C2, mobile session control equipment return carrying quality situation and report response message to the base station.
Among the described step a2, when mobile session control equipment transmission carrying quality situation reports request message, start first timer;
Among the described step b2, after mobile session control equipment is received carrying quality situation reporting message, stop described first timer; If described first timer is overtime, then retransmits carrying quality situation and report request message and restart described first timer;
Among the described step b2, when the base station sends carrying quality situation reporting message, start second timer;
Among the described step c2, after the base station receives that carrying quality situation reports response message, stop described second timer; If described second timer is overtime, then retransmits carrying quality situation reporting message and restart described second timer.
According to said method of the present invention, situation reports the request message number of times to reach predefined number of times if mobile session control equipment is retransmitted the carrying quality, then stops to send described carrying quality situation and reports request message;
Reach predefined number of times if retransmit carrying quality situation reporting message number of times, then stop to send described carrying quality situation reporting message.
Beneficial effect of the present invention is as follows:
(1) the present invention is incorporated into MRS in the mobile communication circuit-domain network, MRS replaces MGW that playback is provided in network in the mode of sharing, DTMF detects and reports, insert conferencing resource, insert audio coder ﹠ decoder (codec) (TC), insert interlink server (Interworking Function, IWF) media resource operating function such as resource.This network configuration make various resources expansion and upgrade more flexiblely, operability and maintainable good has been represented the trend of network evolution.
(2) adopt mobile communications network provided by the invention, when between the network internal mobile subscriber during bi-directional call, coded format is identical when two ends, then directly speech path is based upon between the base station at both call sides place by mobile session control equipment provided by the invention; If two ends coded format difference is carried out the coded format conversion by the TC resource that mobile session control equipment control application and insertion MRS provide.Therefore, on-net call does not need to use MGW as carrying, can effectively reduce the quantity of MGW in the network, reduces the jumping figure of call path, and reduction data packet transmission time delay improves speech quality.
Description of drawings
Fig. 1 is each network entity interconnected relationship schematic diagram of CDMA2000 circuit system territory network A interface IPization back in the prior art;
Fig. 2 is the signaling process figure of mobile soft switch station to station call in the prior art;
Fig. 3 is a circuit-domain network topological diagram of the present invention;
Fig. 4 is a mobile session control equipment structural representation of the present invention;
Fig. 5 initiatively reports the flow chart of carrying quality situation to mobile session control equipment of the present invention for the base station;
Fig. 6 reports the flow chart of carrying quality situation to base station requests for mobile session control equipment of the present invention;
Fig. 7 realizes the signaling process figure of station to station call for adopting circuit-domain network of the present invention.
Embodiment
Referring to Fig. 3, be circuit-domain network topological diagram of the present invention, comprise following network entity:
Base station (Base Station, BS), travelling carriage (Mobile Station, MS), attaching position register (Home Location Register, HLR), VLR Visitor Location Register (Visitor LocationRegister, VLR), gateway MSC (Gateway Mobile Switching Center, GMSC), media gateway (Media GateWay, MGW) and media resource subsystem (MediaResource System, and mobile session control equipment provided by the invention MRS).Passing through as shown in the figure between each network entity, various interface realizes information interaction by the IP bearer network.Interface type comprises A1p interface of the prior art, A2p interface, zz interface, C interface or D interface etc., and the xy interface that increases newly of the present invention.
Wherein, the media resource function controlled entity in MRS and the IMS territory has similar functions, realizes media resource storage and operation.
Mobile session control equipment provided by the invention is finished the mobile soft switch corresponding function that is equivalent among the CDMA 2000, and adopts peer protocol to carry out information interaction by a newly-increased interface xy and MRS, realizes the media resource operation.Because the most of function of mobile session control equipment is identical with mobile soft switch of the prior art, still is expressed as MSCe in Fig. 3.
Described peer protocol is corresponding with asymmetrical agreement, because next generation network (NGN) agreement comprises asymmetrical and reciprocity two quasi-protocols.H.248/Megaco asymmetrical agreement mainly refers to MGCP; Peer protocol comprise conversation initialized protocol (Session Initiated Protocol, SIP), H.323, call-independent control protocol bearing (Bearer Independent Call Control protocol, BICC) etc.Because historical reasons, some replenishes the NGN serial protocols mutually, and some is then vied each other.H.248/Megaco be asymmetrical principal and subordinate's agreement, cooperate with other agreement and can finish various NGN business.SIP, H.323 be peer protocol, have competitive relation,, develop into popular protocol gradually because that SIP has is simple, general, be easy to characteristic such as expansion.
Fig. 4 comprises: Call Control Unit, resource control unit, radio network interface unit and media resource subsystem (MRS) interface unit for the functional module structure schematic diagram that mobile session control equipment of the present invention had.Wherein, the basic functional units that Call Control Unit, resource control unit, radio network interface unit are had for existing MSCe, mobile session control equipment of the present invention has increased a MRS interface unit newly, has saved the media gateway interface unit among the existing MSCe.Mobile session control equipment of the present invention uses between this newly-increased MRS interface unit and the MRS and adopts peer protocol to carry out information interaction.
MRS among the present invention also support and BS between the A2p bearing interface, and in network, adopt the distribution sharing mode that media resource is provided.The media resource function that MRS provides includes but not limited to that playback, DTMF detect and reports, inserts conferencing resource, inserts codec, but inserts the various resources of IWF and follow-up flexible expansion, as Customized Ring Back Tone etc.
Above-mentioned BS also can provide carrying quality testing reporting functions.Wherein, (Real time Transport Control Protocol RTCP) realizes the RTCP Real-time Transport Control Protocol that the carrying quality testing can have been supported by BS, can detect the quality situations such as packet loss, shake, time delay of carrying; Concrete carrying quality uploading flow process is divided into two kinds, and wherein a kind of report flow is initiatively initiated by BS, as shown in Figure 5; Another kind of report flow is initiated by mobile session control equipment, as shown in Figure 6.
Referring to Fig. 5, for BS reports the flow chart that carries the quality situation by newly-increased A1p interface message to mobile session control equipment of the present invention, concrete steps comprise:
A1, BS detect carrying quality situation, and judgement need be reported to mobile session control equipment (as: carrying degradation, situations such as carrying quality recovery), then sends carrying quality situation reporting message to mobile session control equipment, and starts timer Tr;
After b1, mobile session control equipment are received the carrying quality situation reporting message of BS, return carrying quality situation to BS and report response message, BS stops timer Tr after receiving response message.
Abnormal conditions: if Tr is overtime, do not receive that also the carrying quality situation that mobile session control equipment returns reports response message, then retransmit carrying quality situation reporting message and restart timer Tr; Wherein, retransmitting the number of times that carries quality situation reporting message can set in advance.
Fig. 6 comprises the steps: for mobile session control equipment of the present invention initiatively reports the flow chart that carries the quality situation to the BS request
A2, mobile session control equipment send carrying quality situation and report request message to BS, and request reports the carrying situation, and starts timer Tc;
B2, BS send to detected carrying quality situation structure carrying quality situation reporting message mobile session control equipment, and start timer Tr, and mobile session control equipment stops timer Tc after receiving the carrying quality situation reporting message of BS;
C2, mobile session control equipment return carrying quality situation and report response message to BS, and BS stops timer Tr after receiving response message.
Abnormal conditions: if Tc is overtime, also do not receive carrying quality situation reporting message, then retransmit carrying quality situation and report request and restart timer Tc;
If Tr is overtime, do not receive that also carrying quality situation reports response message, then retransmits carrying quality situation reporting message and restarts timer Tr;
Above-mentioned repeating transmission carrying quality situation reports request and retransmits the number of times that carries quality situation reporting message and can set in advance.
The bi-directional call of above-mentioned network internal, if calling terminal adopts identical data encoding format to send signal with called end, then the user data carrying directly is based upon between caller BS and the called BS by the Ap2 interface.
Set forth mobile subscriber's station to station call foundation and release flow process under the network architecture of the present invention with an instantiation below.
Embodiment one: calling terminal adopts identical data encoding format to send signal with called end.
Referring to Fig. 7, be the signaling process figure of cordless communication network station to station call of the present invention.Identical with the call flow of description of the Prior Art shown in Figure 2, suppose that the A2p bearing parameter of Calling Side BS passes to the mobile session control equipment (representing with MSCe1) of Calling Side in CM SerViceRequest message in Fig. 7, the A2p bearing parameter of callee side BS is passed to the mobile session control equipment (representing with MSCe2) of callee side in Fig. 7 in response message (Paging Response), ring-back tone is provided by callee side, and idiographic flow comprises:
1, Calling Side MSCe1 receives the CM Service Request message that BS1 sends, and wherein carries A2p bearing parameter [2], mainly comprises the coded format tabulation of BS1 side expectation, the IP address of the last bearer connection endpoint of BS1, port numbers;
2, MSCe1 sends INVITE to callee side MSCe2, carries the SDP[2 that BS1 goes up bearer connection endpoint];
3, MSCe1 sends Assignment Request message to BS1 request distribution interface-free resources;
4, after interface-free resources was set up and finished, MSCe1 received the Assignment Complete message that BS1 sends;
5, ICQ is to after called, and MSCe2 sends Paging Request message to BS2, can carry the coded format tabulation that obtains from Calling Side; Precedence relationship on this step 5 has no time with step 3 and step 4;
6, MSCe2 receives the Paging Response message that BS2 returns, and wherein carries the A2p parameter [5] of BS2 side, comprises the coded format that the BS2 side joint is subjected to, the IP address of the last bearer connection endpoint of BS2, port numbers;
7, MSCe2 sends Assignment Request message to BS2 request distribution interface-free resources, carries the A2p bearing parameter [2] that BS1 goes up bearer connection endpoint;
8, after interface-free resources was set up and finished, MSCe2 received the Assignment Complete message that BS2 sends;
9, MSCe2 sends INVITE to MRS, carries the SDP[2 that BS1 goes up bearer connection endpoint], apply for that BS1 is gone up bearer connection endpoint puts the bell sound;
10, MRS returns 200 OK response to MSCe2, wherein carries the bearing parameter SDP[3 that MRS goes up the playback end points];
11, MSCe2 sends ACK to MRS;
12, MSCe1 receives 180 message that MSCe2 sends, and wherein has the bearing parameter SDP[3 that MRS goes up the playback end points];
13, the PRACK message of MSCe1 transmission 180 is to MSCe2;
14, MSCe1 receives the 200 OK response of the PRACK message that MSCe2 returns;
15, MSCe1 sends Bearer Update Request message and requires the renewal bearing parameter to BS1, wherein carries MRS and goes up the pairing bearing parameter of playback end points [3];
16, after BS1 carries out corresponding business negotiation and parameter update, return Bearer UpdateResponse message to MSCe1;
17, MRS sets up to calling subscriber's bell sound unidirectional traffic;
18, MSCe2 receives the Connect message indication called subscriber answer of BS2;
19, MSCe2 sends BYE message to MRS, the bearer connection endpoint [3] above discharging;
20, MSCe2 receives the 200 OK response that MRS returns;
21, MSCe1 receives the UPDATE message that MSCe2 sends, and wherein carries the SDP[5 that BS2 goes up bearer connection endpoint];
22, MSCe1 sends the mutually required MSCe2 of 200 OK of UPDATE, carries the SDP[2 that BS1 goes up bearer connection endpoint];
23, MSCe1 sends Bearer Update Request message and requires the renewal bearing parameter to BS1, wherein carries the SDP[5 that BS2 goes up bearer connection endpoint] pairing bearing parameter;
24, after BS1 carries out corresponding business negotiation and parameter update, return Bearer UpdateResponse message to MSCe1;
25, MSCe1 receives the 200 OK response of the INVITE that MSCe2 returns;
26, MSCe1 returns ACK message to MSCe2;
27, bi-directional bearers foundation is finished between the calling and called user;
28, Called Onhook, MSCe2 are received the Clear Request message that BS2 sends;
29, MSCe2 sends BYE message to MSCe1;
30, MSCe1 sends Clear Command message to BS1;
31, MSCe1 receives the Clear Complete message that BS1 returns;
32,200 OK of MSCe1 transmission BYE message respond MSCe2;
33, MSCe2 sends Clear Command message to BS2;
34, MSCe2 receives the Clear Complete message that BS2 returns.
Embodiment two: calling terminal adopts different data encoding formaies to send signal with called end.
Its process step and flow process shown in Figure 7 are similar, and difference is, after the step 8 of Fig. 7, are carried out alternately the TC resource among the application MRS by callee side MSCe2 and MRS;
After Fig. 7 step 18, by to calling out the renewal of two ends bearing parameter, TC is incorporated in the call path, finish the translation function of different code/decode formats, concrete signalling interactive process is a prior art, is omitted at this.
In the flow process shown in Figure 7, step 9-17 is by the information interaction between MSCe2 initiation and the MRS under called, is realized to calling audio playback by MRS.Also can realize specifically comprising by MRS by the information interaction between MSCe1 initiation and the MRS under the caller to calling audio playback:
MSCe1 sends a request message to MRS and applies for the playback end points under the caller, carries the bearing parameter information that Calling Side BS goes up bearer connection endpoint;
Described MRS MSCe1 under caller returns response message, carries the SDP information that MRS goes up the playback end points, and MSCe1 replys acknowledge message under the caller;
The affiliated MSCe1 of caller sends the bearer update request message to the affiliated BS of caller, carries the bearing parameter information that MRS goes up the playback end points, requires the affiliated BS of caller to upgrade its bearing parameter; After BS carried out parameter update under the caller, MSCe1 returned the bearer update response message under caller;
Described MRS sets up to calling subscriber's ring-back tone unidirectional traffic, realizes to calling subscriber's playback.
All the other process steps are identical with Fig. 7.
Describe as can be known by above network configuration, MRS is incorporated into circuit-domain network, be connected with mobile session control equipment provided by the invention with BS in the mode of sharing, replace MGW that playback is provided, DTMF detects and reports, and inserts conferencing resource, insert TC, insert resource operations such as IWF resource, original MGW only disposes and is subordinated to GMSC in the network, is used in network edge conversion between the heterogeneous network medium is provided.This network configuration make various resources expansion and upgrade more flexible, operability and maintainable good.
Describe as can be known by above flow process, when calling and called in the network adopted the same-code form, two-way call directly was based upon between the base station of both call sides by the A2p interface; When calling and called adopt different data encoding formaies, realize encoding and decoding conversion by the TC resource among the MRS.When needing to carry out the media resource operation in the business procedure,, finish alternately by mobile session control equipment provided by the invention and MRS as playback.Therefore, the present invention can effectively reduce the number that uses MGW, reduces the jumping figure of call path, and reduction data packet transmission time delay improves speech quality.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (22)
1, a kind of mobile session control equipment, comprise: Call Control Unit, resource control unit and radio network interface unit, it is characterized in that also comprising media resource subsystem interface unit, adopt peer protocol and media resource subsystem mutual, carry out application, operation and the release of media resource.
2, mobile session control equipment as claimed in claim 1 is characterized in that, described peer protocol is session initiation protocol, H.323 agreement or call-independent control protocol bearing.
3, mobile session control equipment as claimed in claim 1 is characterized in that, described mobile session control equipment is applied in the CDMA2000 network, realizes the mobile Softswitch corresponding function in the network.
4, a kind of mobile communications network comprises: base station equipment, travelling carriage, attaching position register, VLR Visitor Location Register; It is characterized in that, also comprise media resource subsystem and mobile session control equipment with media resource operating function;
Described mobile session control equipment comprises Call Control Unit, resource control unit, radio network interface unit and media resource subsystem interface unit;
Described travelling carriage is linked in the described base station equipment, interconnects between described mobile session control equipment, VLR Visitor Location Register and the attaching position register;
Described mobile session control equipment adopts the peer protocol interactive information by described media resource subsystem interface unit and described media resource subsystem, carries out application, operation and the release of media resource;
Described mobile session control equipment and described media resource subsystem are connected to the IP bearer network by interface respectively, realize the information interaction with other network entity.
5, mobile communications network as claimed in claim 4, it is characterized in that, the media resource operating function that described media resource subsystem has comprises at least: playback, dual-tone multifrequency detect and report, insert conferencing resource, insert codec and insert interlink server resource one of them or its combination in any function.
6, mobile communications network as claimed in claim 4, it is characterized in that, also comprise gateway MSC mobile switching centre and media gateway, described mobile switching centre receives the output signal of Home Network and the input signal of outer net by the IP bearer network, realize the interconnection between the heterogeneous networks, and the conversion of bearer types when controlling described media gateway and carrying out the heterogeneous networks interconnection.
7, mobile communications network as claimed in claim 6 is characterized in that, connects for multi-to-multi between described mobile session control equipment and the described media resource subsystem.
8, mobile communications network as claimed in claim 7 is characterized in that, the bearing interface on the described base station adopts IP agreement carrying data or signaling message.
9, mobile communications network as claimed in claim 8 is characterized in that, described base station has IP carrying quality testing and reporting module, carries out IP carrying quality testing and reports described mobile session control equipment.
10, a kind of speech path establishing method, be applied in the foundation of the speech path between the mobile subscriber in the mobile communications network as claimed in claim 4, it is characterized in that this method comprises: when needing to use media resource in the calling procedure, control described media resource subsystem by described mobile session control equipment and carry out the media resource operation, media resource is inserted in the call bearer path;
When not needing to use media resource, directly setting up the call bearer path under the calling and called between the base station.
11, method as claimed in claim 10 is characterized in that, describedly carries out the media resource operation by mobile session control equipment control media resource subsystem, and media resource is inserted in the call bearer path, specifically comprises:
Initiate to obtain the media resource request to described media resource subsystem according to call logic by described mobile session control equipment, apply for required resource end points;
Described media resource subsystem returns the beared information of resource end points and gives described mobile session control equipment;
Described mobile session control equipment passes to the carrying end that need be attached thereto respectively with the beared information of the resource end points that obtains, and the media resource that described media resource subsystem is provided is inserted in the bearer path.
12, method as claimed in claim 11 is characterized in that, when media resource is finished using, initiates resource by described mobile session control equipment to described media resource subsystem and discharges main request, discharges described media resource.
13, method as claimed in claim 10, it is characterized in that, in call establishment, by the information interaction between initiation of the mobile session control equipment under calling local terminal or the opposite end and the described media resource subsystem, control described media resource subsystem the playback resource is inserted in the bearer path.
14, method as claimed in claim 13 is characterized in that, if by mobile session control equipment initiation under the calling opposite end and the information interaction between the described media resource subsystem, realize comprising the steps: to the local terminal playback
Mobile session control equipment under A1, the calling opposite end sends a request message to described media resource subsystem and applies for the playback end points, carries the bearing parameter information of calling out bearer connection endpoint on the local terminal base station;
B1, the mobile session control equipment of described media resource subsystem under the calling opposite end return response message, carry the SDP information of playback end points on the media resource subsystem, and the mobile session control equipment under the described calling opposite end is replied acknowledge message;
The mobile session control equipment of mobile session control equipment under the calling local terminal under C1, the calling opposite end sends updating message, the bearing parameter information of carrying playback end points on the media resource subsystem that obtains in the B1 step; Call out the mobile session control equipment of the affiliated mobile session control equipment of local terminal under the calling opposite end and return response message;
Mobile session control equipment under D1, the calling local terminal sends the bearer update request message to calling out the local terminal base station, carries the bearing parameter of playback end points on the media resource subsystem, requires this base station to upgrade its bearing parameter; After parameter update was carried out in described base station, the mobile session control equipment under the calling local terminal returned the bearer update response message;
E1, described media resource subsystem are set up to the playback unidirectional traffic of calling out this end subscriber.
15, method as claimed in claim 13 is characterized in that, if by mobile session control equipment initiation under the calling local terminal and the information interaction between the described media resource subsystem, realize comprising the steps: to the local terminal playback
Mobile session control equipment under A2, the calling local terminal sends a request message to described media resource subsystem and applies for the playback end points, carries the bearing parameter information of calling out bearer connection endpoint on the local terminal base station;
B2, the mobile session control equipment of described media resource subsystem under the calling local terminal return response message, carry the SDP information of playback end points on the media resource subsystem, call out the affiliated mobile session control equipment of local terminal and reply acknowledge message;
Mobile session control equipment under C2, the calling local terminal sends the bearer update request message to calling out the local terminal base station, and the bearing parameter information of carrying playback end points on the media resource subsystem that obtains in the B2 step requires the base station to upgrade its bearing parameter; After parameter update was carried out in described base station, the mobile session control equipment under the calling local terminal returned the bearer update response message;
D2, described media resource subsystem are set up to the playback unidirectional traffic of this end subscriber.
16, as claim 14 or 15 described methods, when caller access side adopts identical data encoding format with called access side, set up the call bearer path between the calling and called, specifically comprise:
A3, caller beginning exhale, and finish the Calling Side assignment procedure;
B3, set up called route, paging is called, finishes the callee side assignment procedure, and the callee side mobile session control equipment obtains the bearing parameter of bearer connection endpoint on the Calling Side base station;
C3, callee side or Calling Side mobile session control equipment and described media resource subsystem are initiated the playback request alternately, described media resource subsystem obtains the bearing parameter of bearer connection endpoint on the Calling Side base station, the Calling Side base station obtains the playback end points bearing parameter on the described media resource subsystem and is updated to this locality, the media resource subsystem is set up to calling subscriber's playback data flow, to calling audio playback;
Behind D3, the called party answer, the mobile session control equipment and the described media resource subsystem of initiating the playback request discharge the playback resource alternately;
E3, Calling Side base station obtain the bearing parameter information of bearer connection endpoint on the base station, called place and are updated to this locality, set up the speech path between the affiliated base station of calling and called.
17, as claim 14 or 15 described methods, it is characterized in that, if it is different with the coded format that called access side adopts that caller inserts side, when setting up the call bearer path between the calling and called, undertaken alternately by callee side or Calling Side mobile session control equipment and described media resource subsystem, codec resource in the application media resource subsystem, and by renewal to calling two ends bearing parameter, described codec resource is inserted in the call path, carries out the conversion of the different code/decode formats in both sides.
18, described method as claimed in claim 10 is characterized in that, the affiliated base station of calling and called is also carried quality testing and reported, and concrete grammar comprises:
The carrying quality of bearer path is detected in a1, base station, sends carrying quality situation reporting message to described mobile session control equipment;
After b1, mobile session control equipment are received the carrying quality situation reporting message of base station transmission, return carrying quality situation and report response message.
19, method as claimed in claim 18 is characterized in that, among the described step a1, when the base station sends carrying quality situation reporting message, starts a timer;
Among the described step b1, after the base station receives that carrying quality situation reports response message, stop described timer; If timer expiry is then retransmitted carrying quality situation reporting message and is restarted described timer.
Reach predefined number of times if retransmit carrying quality situation reporting message number of times, then stop to send described carrying quality situation reporting message.
20, method as claimed in claim 10 is characterized in that, the affiliated base station of calling and called is also carried quality testing and reported, and concrete grammar comprises:
A2, mobile session control equipment send carrying quality situation and report request message to the base station, and request reports the carrying situation;
B2, base station send to mobile session control equipment with detected carrying quality situation structure carrying quality situation reporting message;
C2, mobile session control equipment return carrying quality situation and report response message to the base station.
21, method as claimed in claim 20 is characterized in that, among the described step a2, when mobile session control equipment transmission carrying quality situation reports request message, starts first timer;
Among the described step b2, after mobile session control equipment is received carrying quality situation reporting message, stop described first timer; If described first timer is overtime, then retransmits carrying quality situation and report request message and restart described first timer;
Among the described step b2, when the base station sends carrying quality situation reporting message, start second timer;
Among the described step c2, after the base station receives that carrying quality situation reports response message, stop described second timer; If described second timer is overtime, then retransmits carrying quality situation reporting message and restart described second timer.
22, method as claimed in claim 21 is characterized in that, situation reports the request message number of times to reach predefined number of times if mobile session control equipment is retransmitted the carrying quality, then stops to send described carrying quality situation and reports request message;
Reach predefined number of times if retransmit carrying quality situation reporting message number of times, then stop to send described carrying quality situation reporting message.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101399815B (en) * | 2007-09-30 | 2014-12-24 | 华为技术有限公司 | Service negotiating method, gateway and related device |
| CN106302633A (en) * | 2016-07-25 | 2017-01-04 | 安徽新华学院 | A kind of intelligent communication method based on Internet of Things |
| WO2019196822A1 (en) * | 2018-04-09 | 2019-10-17 | Mediatek Inc. | Method and apparatus for session release in wireless communication |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020188744A1 (en) * | 2001-05-31 | 2002-12-12 | Mani Babu V. | Direct connect service in a multimedia-capable network |
| ATE334551T1 (en) * | 2002-06-03 | 2006-08-15 | Cit Alcatel | TELECOMMUNICATIONS SYSTEM WITH TRANSFER OF A PACKET SWITCHED MULTIMEDIA SESSION TO A CIRCUIT SWITCHED CONNECTION |
| CN100372346C (en) * | 2005-01-12 | 2008-02-27 | 北京邮电大学 | A media server based on soft switch |
| CN1645861A (en) * | 2005-01-20 | 2005-07-27 | 武汉市中光通信公司 | Flexible exchanging network method for passing fire wall |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101399815B (en) * | 2007-09-30 | 2014-12-24 | 华为技术有限公司 | Service negotiating method, gateway and related device |
| CN106302633A (en) * | 2016-07-25 | 2017-01-04 | 安徽新华学院 | A kind of intelligent communication method based on Internet of Things |
| CN106302633B (en) * | 2016-07-25 | 2019-05-14 | 安徽新华学院 | A kind of intelligent communication method based on Internet of Things |
| WO2019196822A1 (en) * | 2018-04-09 | 2019-10-17 | Mediatek Inc. | Method and apparatus for session release in wireless communication |
| TWI718517B (en) * | 2018-04-09 | 2021-02-11 | 聯發科技股份有限公司 | Method, electric apparatus and memory for session release in wireless communication |
| US10945177B2 (en) | 2018-04-09 | 2021-03-09 | Mediatek Inc. | Method and apparatus for session release in wireless communication |
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