CN103037119B - Method and device of voice service rapid establishment - Google Patents
Method and device of voice service rapid establishment Download PDFInfo
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- CN103037119B CN103037119B CN201210533644.8A CN201210533644A CN103037119B CN 103037119 B CN103037119 B CN 103037119B CN 201210533644 A CN201210533644 A CN 201210533644A CN 103037119 B CN103037119 B CN 103037119B
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Abstract
The invention relates to the technical field of communication, and provides a method and a device of voice service rapid establishment. The method includes steps as follows. Step one, a priority level attribute is established for each time slot, and the priority level attribute records and updates a priority level identification corresponding to each time slot; step two, a voice service establishment request is receieved; step three, a time slot corresponding to a priority level identification with the highest priority level is selected; and step four, a voice service is established according to the time slot selected in step three. According to the method and the device of the voice service rapid establishment, the priority level attribute is arranged, the voice service is established according to the time slot with the highest priority level, and rapid establishment of voice service calling based on a primary rate interface (PRI) link is achieved; and the method and the device of the voice service rapid establishment are provided with certain system fault tolerance performance, improve reliability of PRI voice service calling in a soft exchange signalling network, and achieve running stability of the soft exchange signalling network used for internetwork interconnection PRI voice service calling.
Description
Technical field
The present invention relates to communication technical field, relate in particular to method and the device of the speech business Rapid Establishment based on pri signaling link in a kind of signaling gateway of softswitch.
Background technology
The development of modern communication networks, interconnected more and more frequent between heterogeneous networks operator, the also more sophisticated alternately of diverse network exchange agreement.From the trend of network Development, the NGN(Next Generation Network using IP as backbone network, next generation network) be the emphasis that current each operator builds.But traditional agreement based on the transmission of E1 circuit is as PRI(Primary Rate Interface, primary rate interface) etc. still playing the part of the key player of network service.The extensive distribution of these legacy network devices requires modern communications switch can support the mutual of legacy network and modern network and merge.In traditional switching network with E1 circuit carrying, pri signaling agreement between the network switch and user in occupation of consequence.As described in Figure 1, the user of user's side 11 ends (user 1 and user 2 as shown in FIG.), the PRI agreement of employing based on Q.921, as communication protocol, set up and communicated by letter with network side exchange gateway 12, and access external network 13 by network side exchange gateway 12.
Wherein, European 30 road pulse-code modulation PCM is called for short E1, and speed is 2.048Mbit/s.What China adopted is European E1 standard.A time division multiplexing frame (its length T=125us) of E1 is divided into 32 equal time slots altogether, time slot be numbered CH0 ~ CH31.Wherein time slot CH0 is as frame synchronization (being clock signal), and time slot CH16 is used for transmitting signaling, and remaining CH1 ~ CH15 and CH17 ~ CH31 totally 30 time slots are used as 30 speech channels.Each time slot transmits 8bit, therefore shares 256bit.8000 frames of transmission per second, therefore the data transfer rate of PCM primary group E1 is exactly 2.048Mbit/s.
Pri signaling agreement, as network side and user's side communication protocol, taking E1 as carrying medium, adopts the design philosophy of common channel signalling.In concrete implementation procedure, being distributed in static list of data of time slot configures, and the time slot of both sides' call must unanimously could successfully dock, otherwise will occur the anomalies such as speech channel is obstructed, cross-talk.In this case, once conversing in dispose procedure, if opposite equip. for a certain reason, causes voice channel time slot CIC(Circuit Identification Code, cic circuit identification code) also do not discharge in time, and local terminal discharges.Now local terminal makes a call again, will from static list of data, again choose the CIC of last time application, then this converse unsuccessfully, until opposite end has discharged the CIC conversing last time.
Therefore need a kind of method of speech business Rapid Establishment, solve the failure time and again of existing speech business call setup, affect the quality of voice call, and then affect the technical problem of the performance of the switching equipment such as core net.
Summary of the invention
Technical problem to be solved by this invention is, a kind of method and device of speech business Rapid Establishment are provided, solve the failure time and again of the speech business call setup based on PRI in prior art, affect the quality of voice call, and then affect the technical problem of the performance of the switching equipment such as core net.
In order to address the above problem, the invention provides a kind of speech business method for fast establishing and comprise the steps: that (1) creates a priority attribute for each time slot, described priority attribute records and upgrades the priority tag of corresponding time slot; (2) receive speech business and set up request; (3) select the highest corresponding time slot of priority tag of priority-level; (4) set up speech business by the selected time slot of step (3).
In order to address the above problem, the present invention also provides a kind of speech business Rapid Establishment device, and described device comprises: creating unit, receiving element, selected cell and processing unit; Described creating unit is used to each time slot to create a priority attribute, and described priority attribute records and upgrade the priority tag of corresponding time slot; Described receiving element is connected with described creating unit, sets up request for receiving speech business; Described selected cell is connected with described receiving element, for selecting the corresponding time slot of priority tag that priority-level is the highest; Described processing unit is connected with described selected cell, for setting up speech business by the selected time slot of described selected cell.
The invention has the advantages that, by priority attributes being set and selecting the high time slot of priority-level to set up speech business, realize the Rapid Establishment that the speech business based on PRI link is called out, and there is certain System Fault Tolerance performance, improve the reliability of PRI audio call in signaling gateway of softswitch, realize the stability of signaling gateway of softswitch for the PRI audio call operation of internetwork-ing, in the concrete audio call based on E1 circuit, all have wide practical use.
Brief description of the drawings
Fig. 1, the Organization Chart of traditional switching network of network service;
Fig. 2, the flow chart of an execution mode of speech business method for fast establishing of the present invention;
Fig. 3, the Organization Chart of an execution mode of speech business Rapid Establishment device of the present invention;
Fig. 4, the flow chart of primary rate interface call flow.
Embodiment
Method below in conjunction with accompanying drawing to speech business Rapid Establishment provided by the invention and the embodiment of device elaborate.
First provide by reference to the accompanying drawings the embodiment of speech business method for fast establishing of the present invention.
Shown in accompanying drawing 2, be the flow chart of speech business method for fast establishing described in this embodiment, next the step shown in accompanying drawing 2 elaborated.
S201: for each time slot creates a priority attribute, described priority attribute records and upgrade the priority tag of corresponding time slot.
Consider in the both sides that set up speech business, after one side discharges, opposite end does not likely also discharge in time, or opposite end fault so that voice channel time slot CIC do not discharge at all, thereby cause the calling failure always of again initiating, discharge until the voice channel time slot CIC of opposite end is normal.In order to solve this technical problem, the present invention proposes a kind of new voice channel time slot CIC dynamic allocation method: for each time slot creates a priority attribute.Wherein, the scope that priority value can be set be 1-30(the 0th time slot generally as clock signal, 16 time slots generally as the signalling time slot, therefore these two time slots do not arrange priority), be worth littlely, priority-level is higher.
In other embodiments, can, in the time of initial condition, arrange described priority tag according to the number order of all time slots.
S202: receive speech business and set up request.
S203: select the highest corresponding time slot of priority tag of priority-level.
S204: set up speech business by the selected time slot of step S203.
Call out according to one end Client-initiated receiving, can be according to priority-level order, selection takies the time slot that priority-level is high and sets up speech business, thereby ensure signaling gateway of softswitch Rapid Establishment PRI audio call, solve and in signaling gateway of softswitch, in PRI audio call a period of time, called out time and again unsuccessful problem, and there is certain System Fault Tolerance performance; And ensure that call setup is the guarantee of data service reliable exchange in signaling switching network fast, therefore the present invention has improved the reliability of PRI audio call in signaling gateway of softswitch.
In other embodiments, after step S204, further perform step S205.
S205: the priority tag that upgrades all time slots.Be specifically as follows: the priority-level of the selected time slot of emptying step S203; Increase the priority-level of other non-selected time slots.; according to priority-level, selective sequential takies the time slot that priority-level is the highest and sets up after speech business; priority-level corresponding to time slot that this priority-level is the highest can be cleared (for example priority value clear 0), to identify this time slot in occupied state; Increase other not priority-level (for example priority value successively-1) of the selected time slot CIC taking simultaneously.By upgrading the priority tag of all time slots, while making again to make a call, can be according to the priority-level of the each time slot after upgrading, again select to take the time slot that priority-level is the highest, thereby further ensure signaling gateway of softswitch Rapid Establishment PRI audio call, improved the reliability of PRI audio call in signaling gateway of softswitch.
In other embodiments, after step S205, further perform step S206.
S206: after the selected time slot of step S203 is released, the priority-level of upgrading described time slot is minimum.While making again to make a call, if there is other time slots CIC free time, can removes to take the time slot CIC of other priority-level the highest (being priority value minimum), and can not take this time slot CIC just having discharged; Like this, call out and can process slowly because of opposite end signaling, or the corresponding opposite end of the time slot just having discharged time slot does not discharge and the call failure problem brought in time; Realization dynamically updates the features such as the performance statistics of CIC, thereby ensures the Rapid Establishment of speech business.
By priority attributes being set and selecting the high time slot of priority-level to set up speech business, realize the Rapid Establishment that the speech business based on PRI link is called out, and there is certain System Fault Tolerance performance, improve the reliability of PRI audio call in signaling gateway of softswitch, realized the stability of signaling gateway of softswitch for the PRI audio call operation of internetwork-ing.
Next provide by reference to the accompanying drawings the embodiment of speech business Rapid Establishment device of the present invention.
Shown in accompanying drawing 3, be the Organization Chart of speech business Rapid Establishment device described in this embodiment, described device comprises creating unit 31, receiving element 32, selected cell 33 and processing unit 34.
Described creating unit 31 is used to each time slot to create a priority attribute, and described priority attribute records and upgrade the priority tag of corresponding time slot.Wherein, the scope that priority value can be set be 1-30(the 0th time slot generally as clock signal, 16 time slots generally as the signalling time slot, therefore these two time slots do not arrange priority), be worth littlely, priority-level is higher.
Described device can also comprise the initialization unit 30 being connected with described creating unit 31, and described initialization unit 30, for when the initial condition, is arranged described priority tag according to the number order of all time slots.
Described receiving element 32 is connected with described creating unit 31, sets up request for receiving speech business.
Described selected cell 33 is connected with described receiving element 32, for selecting the corresponding time slot of priority tag that priority-level is the highest.One end Client-initiated that described selected cell 33 receives according to receiving element 32 is called out, and according to priority-level order, selects the highest time slot of priority-level.
Described processing unit 34 is connected with described selected cell 33, for setting up speech business by the selected time slot of described selected cell 33.Described processing unit 34 takies the high time slot of the selected priority-level of described selected cell 33 and sets up speech business, thereby ensure signaling gateway of softswitch Rapid Establishment PRI audio call, solve and in signaling gateway of softswitch, in PRI audio call a period of time, called out time and again unsuccessful problem, and there is certain System Fault Tolerance performance, improved the reliability of PRI audio call in signaling gateway of softswitch.
In other embodiments, described device also comprises the first updating block 35 being connected with described processing unit 34, and described the first updating block 35 is for upgrading the priority tag of all time slots.For example: empty the priority-level of the selected time slot of described selected cell, and increase the priority-level of other non-selected time slots.; described processing unit 34 takies the highest time slot of the selected priority-level of described selected cell 33 and sets up after speech business; priority-level corresponding to time slot that this priority-level is the highest can be cleared (for example priority value clear 0), to identify this time slot in occupied state; Increase other not priority-level (for example priority value successively-1) of the selected time slot CIC taking simultaneously.By upgrading the priority tag of all time slots, while making again to make a call, can be according to the priority-level of the each time slot after upgrading, again select to take the time slot that priority-level is the highest, thereby further ensure signaling gateway of softswitch Rapid Establishment PRI audio call, improved the reliability of PRI audio call in signaling gateway of softswitch.
In other embodiments, described device also comprises the second updating block 36 being connected with described the first updating block 35, described the second updating block 36 is for after being released at the selected time slot of described selected cell 33, and the priority-level of upgrading described time slot is minimum.Like this, again receive while making a call, if there is other time slots CIC free time, can removes to take the time slot CIC of other priority-level the highest (being priority value minimum), and can not take this time slot CIC just having discharged; Like this, call out and can process slowly because of opposite end signaling, or the corresponding opposite end of the time slot just having discharged time slot does not discharge and the call failure problem brought in time.
Next provide the preferred embodiment of technique scheme.
The distribution principle of the common audio call CIC of paper.
Under normal circumstances, being distributed in tables of data of time slot speech channel CIC should be deposited continuously, as shown in table 1 below.
| Time-gap number (CIC) | Whether take |
| 1 | Yes |
| 2 | Yes |
| 3 | No |
| 4 | No |
| 5 | No |
| ... | ... |
| 31 | No |
Table 1 Time Slot Occupancy table.
Calling terminal A, selecting out CIC while setting up speech business, follows the principle of order-assigned, i.e. sequential search Time Slot Occupancy table 1 from small to large, and first unappropriated CIC 3 is target CIC; In the A of end office (EO) inside, CIC 3 is occupied; Under normal circumstances, called end B receiving after the SETUP message of calling terminal A, and the CIC numbering CIC3 carrying according to this message searches respective objects; In the B of end office (EO), CIC 3 is therefore occupied.Like this, once call is successfully established.In normal talking process, the Time Slot Occupancy situation of the A of end office (EO) and B is as table 2, shown in 3.
| Time-gap number (CIC) | Whether take |
| 1 | Yes |
| 2 | Yes |
| 3 | Yes |
| 4 | No |
| 5 | No |
| ... | ... |
| 31 | No |
In table 2 normal talking, calling terminal A Time Slot Occupancy table.
| Time-gap number (CIC) | Whether take |
| 1 | Yes |
| 2 | Yes |
| 3 | Yes |
| 4 | No |
| 5 | No |
| ... | ... |
| 31 | No |
In table 3 normal talking, called end B Time Slot Occupancy table.
Now, normally discharge if take the user's communication of time slot CIC 2, the A of end office (EO), the Time Slot Occupancy situation of B is as table 4, shown in 5.
| Time-gap number (CIC) | Whether take |
| 1 | Yes |
| 2 | No |
| 3 | Yes |
| 4 | No |
| 5 | No |
| ... | ... |
| 31 | No |
Table 4CIC 2 normally discharges, calling terminal A Time Slot Occupancy table.
| Time-gap number (CIC) | Whether take |
| 1 | Yes |
| 2 | No |
| 3 | Yes |
| 4 | No |
| 5 | No |
| ... | ... |
| 31 | No |
Table 5CIC 2 normally discharges, called end B Time Slot Occupancy table.
Now, if calling subscriber makes a call again, according to the minimum unappropriated distribution principle of CIC, calling subscriber will select time slot CIC 2 to call out voice channel time slot as this again, thereby again initiates call.
With reference to accompanying drawing 4, the flow chart of primary rate interface call flow, PRI call flow is: S401: the A(PRI A of end office (EO)) to the B(PRI B of end office (EO)) initiate SETUP(and set up request message); S402: the B of end office (EO) returns to CALLPROCEEDING(call proceeding message to the A of end office (EO)); S403: the B of end office (EO) returns to ALERTING(call alert message to the A of end office (EO)); S404: the B of end office (EO) sends CONNECT(call setup message to the A of end office (EO)); S405: the A of end office (EO) returns to CONNECT ACK(to the B of end office (EO) and sets up response message); S406: the A of end office (EO) and the B of end office (EO) communicate; S407: end of conversation, the A of end office (EO) initiates DISCONNECT(releasing request message to the B of end office (EO)); S408: the B of end office (EO) returns to RELEASE(call release message to the A of end office (EO)); S409: the A of end office (EO) returns to the normal release message of RELEASE COMPLETE(to the B of end office (EO)), end of conversation, the shared time slot of conversing is normally discharged.
As table 2, shown in 3, in the A of end office (EO) and the B of end office (EO) communication process, take CIC 1,2,3 voice channel time slot.The party A-subscriber of end office (EO) who takies CIC 2 initiatively initiates release message DISCONNECT, for a certain reason (as, information drop-out, end office's B upper-layer service is abnormal, DSP does not respond etc.) cause the CIC 2 of the B of end office (EO) normally not discharge, and the CIC 2 of the A of end office (EO) has discharged, in this case, the Time Slot Occupancy table of the A of end office (EO) and B is as table 6, shown in 7.
| Time-gap number (CIC) | Whether take |
| 1 | Yes |
| 2 | No |
| 3 | Yes |
| 4 | No |
| 5 | No |
| ... | ... |
| 31 | No |
Table 6CIC 2 normally discharges, calling terminal A Time Slot Occupancy table.
| Time-gap number (CIC) | Whether take |
| 1 | Yes |
| 2 | Yes |
| 3 | Yes |
| 4 | No |
| 5 | No |
| ... | ... |
| 31 | No |
Table 7CIC 2 discharges extremely, called end B Time Slot Occupancy table.
From the A of end office (EO), call out normally and discharge, now the A of end office (EO) makes a call again, and according to CIC static allocation principle, the A of end office (EO) can distribute CIC 2 again; In the time that SETUP message arrives the B of end office (EO), because the CIC 2 of the B of end office (EO) discharges not yet, directly loopback failure.Thereby the calling failure always that causes the A of end office (EO) to initiate, until normal release of CIC 2 of the B of end office (EO).
By above-mentioned analysis, PRI speech business can not Rapid Establishment reason be using static routing table as according to distributing CIC, do not consider this discharge after opposite end may also not discharge in time, or opposite end fault so that CIC do not discharge at all.
The present invention is exactly for this phenomenon, proposes a kind of method of new CIC dynamic assignment, ensures PRI voice call service Rapid Establishment, and has certain System Error-tolerance Property, thereby promote the performance of switching network.Be specially: each CIC increases a priority attribute, priority-level numeric representation, number range is 1-30, is worth littlely, priority is higher.When initial, priority is arranged according to time-gap number order.Initial CIC takies table (0 time slot is generally as clock signal, and 16 time slots are generally as the signalling time slot) as shown in table 8.
| Time-gap number (CIC) | Whether take | Priority |
| 1 | No | 1 |
| 2 | No | 2 |
| 3 | No | 3 |
| 4 | No | 4 |
| 5 | No | 5 |
| ... | ... | ... |
| 31 | |
30 |
Table 8 CIC with priority of the present invention takies table.
Taking time slot can take according to the rank size order of priority, once and occupied, the priority value of this time slot can be by clear 0, the priority value successively-1 of other unappropriated CIC.If 3 continuous callings are all in call, now, according to priority-level, time slot CIC 1,2,3 can sequentially be taken, and meanwhile, their priority value all becomes 0.And other unappropriated time slot priority values equal-3.As shown in table 9.
| Time-gap number (CIC) | Whether take | Priority |
| 1 | Yes | 0 |
| 2 | Yes | 0 |
| 3 | Yes | 0 |
| 4 | No | 1 |
| 5 | No | 2 |
| ... | ... | ... |
| 31 | No | 27 |
Table 9CIC 1,2,3 is occupied.
Discharge a certain CIC, the priority-level of this CIC can be reduced to minimum.When this has ensured again to make a call, if there is other CIC free time, can removes to take the CIC of other priority value minimums (except 0), and can not take this CIC just having discharged.Like this, call out not and can process slowly or this time slot does not discharge and the call failure problem brought in time because of opposite end signaling.Time Slot Occupancy table after CIC 2 is released is as shown in table 10.
| Time-gap number (CIC) | Whether take | Priority |
| 1 | Yes | 0 |
| 2 | No | 28 |
| 3 | Yes | 0 |
| 4 | No | 1 |
| 5 | No | 2 |
| ... | ... | ... |
| 31 | No | 27 |
Table 10CIC 2 discharges.
When local terminal makes a call again, the now selection of CIC numbering can be CIC 4 but not CIC 2, thereby avoid to greatest extent calling out and discharged the call failure problem extremely causing because of opposite end CIC, improve the Rapid Establishment that speech business is called out, also the performance that has promoted system, makes system have certain fault-tolerant ability simultaneously.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (4)
1. a method for speech business Rapid Establishment, is characterized in that, comprises the steps:
(1) for each time slot creates a priority attribute, described priority attribute records and upgrades the priority tag of corresponding time slot;
(2) receive speech business and set up request;
(3) select the highest corresponding time slot of priority tag of priority-level;
(4) set up speech business by the selected time slot of step (3);
(5) upgrade the priority tag of all time slots, wherein step (5) further comprises: the priority-level of the selected time slot of (51) emptying step (3); (52) increase the priority-level of other non-selected time slots;
(6) after the selected time slot of step (3) is released, the priority-level of upgrading d/d time slot is minimum.
2. the method for speech business Rapid Establishment according to claim 1, is characterized in that, further comprises before in step (1): when (10) initial condition, arrange described priority tag according to the number order of all time slots.
3. a device for speech business Rapid Establishment, is characterized in that, described device comprises: creating unit, receiving element, selected cell and processing unit;
Described creating unit is used to each time slot to create a priority attribute, and described priority attribute records and upgrade the priority tag of corresponding time slot;
Described receiving element is connected with described creating unit, sets up request for receiving speech business;
Described selected cell is connected with described receiving element, for selecting the corresponding time slot of priority tag that priority-level is the highest;
Described processing unit is connected with described selected cell, for setting up speech business by the selected time slot of described selected cell;
Described device also comprises the first updating block being connected with described processing unit, described the first updating block for upgrade all time slots priority tag, empty the priority-level of the selected time slot of described selected cell, and increase the priority-level of other non-selected time slots;
Described device also comprises the second updating block being connected with described the first updating block, and described the second updating block is for after the selected time slot of described selected cell is released, and the priority-level of upgrading d/d time slot is minimum.
4. the device of speech business Rapid Establishment according to claim 3, it is characterized in that, described device also comprises the initialization unit being connected with described creating unit, and described initialization unit, in the time of initial condition, is arranged described priority tag according to the number order of all time slots.
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| WO2006069470A1 (en) * | 2004-12-28 | 2006-07-06 | Zte Corporation | A METHOD OF DYNAMICALLY ASSIGNING TRANSMISSION TIME SLOT IN Abis INTERFACE OF MOBILE COMMUNICATION SYSTEM |
| US7809399B2 (en) * | 2006-02-10 | 2010-10-05 | Syntek International Holding Ltd. | Method and device for providing multiple communication protocols with a single transceiver |
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