CN1293737C

CN1293737C - Method for implementing multiple protocol processing in communication central processor

Info

Publication number: CN1293737C
Application number: CNB021236828A
Authority: CN
Inventors: 李琥; 梅武钢
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2002-07-08
Filing date: 2002-07-08
Publication date: 2007-01-03
Anticipated expiration: 2022-07-08
Also published as: CN1467970A

Abstract

The present invention discloses a method for realizing multiple protocols on a communication CPU. The method at least comprises the steps that A, idle resources in an HDLC link channel extra parameter table to a channel parameter table of an HDLC link, and more than one communication protocols are configured in the HDLC link channel parameter table; B, an extra enquiry cycle is arranged in advance; C, the data receiving of all the communication protocols in the 10 ms enquiry cycle and the data transmitting containing a small number of data packets and requesting no accomplishment of congestion processing are processed, and the data receiving of all the communication protocols in the 10 ms enquiry cycle and the data transmitting containing a large number of data packets and requesting the accomplishment of congestion processing in an extra enquiry cycle are processed. The method at most supports 130 HDLC links and can simultaneously realize multiple protocols and flexibly configuring different properties of the HDLC links on the communication CPU.

Description

On the communication central processing unit, realize the method that various protocols is handled

Technical field

The present invention relates to the communications protocol treatment technology, particularly a kind of method that realizes that various protocols is handled that goes up at communication central processing unit (CPU).

Background technology

Communications protocol is meant that communication two party must observe the set of rule of agreement in advance in communication process, for example the PPP(Point-to-Point Protocol) of the B channel of the Q921 agreement of the Q703 agreement of Signaling System Number 7 (SS7), primary rate interface (PRI) and Integrated Service Digital Network etc.Various communications protocol can be handled in the communication processing section of communication CPU, because various communications protocol have different requirements for processing speed, capacity and delay, therefore difference is also arranged on designing technique, present designing technique is divided into two classes, one class is to realize signaling merely, for example realize a SS7 or several PRI, another kind of is simple 60 road ISDN B channels or two PRI of realizing.

The main difference of existing two class technology is on the processing method of transceive data, and the method for handling transceive data mainly contains two kinds, and a kind of is interrupt mode, and a kind of is inquiry mode.These two kinds of processing methods respectively have characteristics, when different protocol processes, need the utilization diverse ways.

Realize the utilization of signaling merely for the first kind, because signaling process is a large amount of parcels, and when signaling link is many, interrupt too frequently, can consume more CPU disposal ability, so, in signaling process, use inquiry mode usually.Inquiry mode generally adopts the 10ms cycle, and speed all has certain shortcoming sooner or more slowly.If polling cycle, can cause that call proceeding speed is slack-off greater than 10ms, be a big shortcoming of performance for entire product; If inquiry velocity less than 10ms, then can consume more CPU disposal ability.According to routine, each bar signaling message generally all can postpone to arrive behind several ms, timer processing repeatedly, only be idle running, so when adopting the 10ms inquiry mode, several packets can be received simultaneously, submit to the upper strata then and handle, so both can reduce part inquiry expense, also not influence the performance that continues of signaling.If the employing interrupt mode is having under the situation of multilink, have more Interrupt Process expense, this moment, a large amount of parcel was very time-consuming for operating system in the signaling link.

In general, after the processing delay of having calculated signaling and disposal ability, just design, for example, if require signaling link to handle the speech channel of specified quantity,, calculate the total amount of signaling process message then according to load Ireland number of each speech channel, then, calculate 10ms again and can handle how much message.The delay that it is pointed out that each message in addition is to have certain requirements, and oversize delay can cause call proceeding slow.

Application for the second class ISDN access aspect, because the general transmission of ISDN online is bigger packet, general transmission is the big bag of transmission control protocol (TCP) in the practice, do not wait from tens to hundreds of is individual, and when adopting the 10ms inquiry general transmission be the packet of 80Byte, so using the mode of 10ms inquiry is not a kind of suitable method, moreover under the few situation of passage, the additive decrementation that the mode of 10ms inquiry may cause system is more than actual needs, in addition, the 10ms inquiry inevitably can add the delay about 10ms, nor can support other service quality (QOS) formation to use well, therefore for this utilization, use interrupt mode more suitable, and the expense that causes interruption will lack compared with the expense of 10ms timer relatively, and processing delay is also few.

This present two classes technology can not realize the processing of various protocols simultaneously, can not the different attribute of high speed data link control procedure (HDLC) link be disposed arbitrarily, and when using in the system of 124 HDLC links that contain Signaling System Number 7 (SS7) agreement, the internal storage resource of CPU can become very nervous.

Summary of the invention

In view of this, main purpose of the present invention is to provide a kind of method that realizes that various protocols is handled that goes up at communication central processing unit (CPU), make its various protocols such as B channel that can handle Signaling System Number 7 (SS7), primary rate interface (PRI) and Integrated Service Digital Network simultaneously, and different attribute that can flexible configuration HDLC link.

For achieving the above object, technical scheme of the present invention specifically is achieved in that

A kind of method that realizes the various protocols processing on communication CPU, this method comprises the steps: at least

A, the idling-resource in the HDLC link channel additional parameter table is distributed to the channel parameters table of HDLC link, and in HDLC link channel parameter list more than one communications protocol of configuration;

B, set in advance an additional queries cycle;

C, handle the Data Receiving of all communications protocol in polling cycle and contain the low volume data bag and do not require that the data of the communications protocol that realizes congested processing send, handles the data transmission that contains the mass data bag and require to realize the communications protocol of congested processing in the cycle in 10ms polling cycle and additional queries at 10ms.

Wherein, the passage additional parameter table of the described HDLC link of steps A and channel parameters table are deposited in the memory of CPU inside; The described communications protocol of steps A is SS7 channel agreement or PRI channel agreement or ISDN B channel agreement, or its combination, the channel parameters table of SS7 channel is fixedly set in the assigned address in the HDLC channel parameters table section, this assigned address is arranged in the place, 0X2000 address of CPU 16K DPRAM, and the channel parameters table of PRI and ISDN B channel is arranged at the optional position in the HDLC channel parameters table section; Containing the low volume data bag and not requiring that the communications protocol that realizes congested processing is SS7 channel agreement or PRI channel agreement or its combination described in the step C, the described communications protocol that contains mass data bag and the congested processing of requirement realization is an ISDN B channel agreement.

When the data of handling ISDN B channel agreement sent, the additional queries cycle was set to 30ms.

Described technical solution of the present invention, further comprise: when the data that step C contains the mass data bag and require to realize the communications protocol of congested processing in processing send, handle transmission data in the physical layer buffering area in polling cycle at 10ms, handle transmission data in the congested formation in the cycle in additional queries.

The transmission data of wherein handling in the physical layer buffering area further comprise:

C11, release physical layer send buffering area;

C12, judge whether to meet physical layer and send condition, as meet, then call physical layer and send function and carry out data and send, otherwise carry out congested processing.

Congested processing described in the step C12 comprises following several steps:

C121, when congested formation when being empty, rejudge and whether meet physical layer and send condition, if do not meet, return congestion information again after then earlier message being put into congested formation, otherwise, call physical layer and send and return success state value after function sends message;

C122, when congested formation when not being empty, judge whether congested formation full, if full, return the information of abandoning after then discharging message, otherwise return congestion information after message put into congested formation.

Described technical solution of the present invention further comprises: the transmission data of handling in the congested formation further comprise:

C21, release physical layer send buffering area;

C22, carry out congested processing.

In step C22, judge that at first whether congested formation is empty, when congested formation is sky, returns success state value; When congested formation is not sky, in congested formation, get first bag, judge whether to meet physical layer thereafter and send condition, if meet, then call the quality of service transport function and send message, otherwise, data are reentered into congested queue heads.

Because technical solution of the present invention is by the channel resource of reasonable distribution HDLC link, adopt the 10ms inquiry, directly call physical layer and send function and 10ms inquiry and add that the mode of additional queries handles the data transmit-receive of communications protocol, make communication CPU can realize the processing of the various protocols such as ppp protocol of the Q921 agreement of Q703 agreement, PRI of SS7 and ISDN B channel simultaneously, improve the utilization ratio of cpu chip, increased the agreement saturation of CPU.Because the present invention has carried out reasonably distributing again to the memory headroom of CPU, utilize the clear area of passage additional parameter table, deposit the channel parameters table of HDLC link, realized making full use of of resource, and can carry out flexible configuration the different attribute of HDLC link.

Description of drawings

Fig. 1 is the memory allocation principle schematic of DPRAM among the CPU of the present invention.

Fig. 2 for the Data Receiving part of SS7, PRI among the present invention and ISDN B channel at the process chart of 10ms in polling cycle.

Fig. 3 sends part at the process chart of 10ms in polling cycle for the data of ISDN B channel among the present invention.

Fig. 4 sends the process chart of part in the 30ms additional queries cycle for the data of ISDN B channel among the present invention.

Embodiment

Technical solution of the present invention can be supported up to 130 HDLC links, can satisfy 124 HDLC links of system requirements, comprising 16 SS7,8 PRI and a plurality of ISDN B channel.

The CPU that uses in the present embodiment has the double-port RAM (DPRAM) of capacity as 16K, can place various parameter lists among this DPRAM, comprising the channel parameters table (Channel-Specific HDLC Parameters) of HDLC link, the passage additional parameter table (Channel ExtraParameters) of HDLC link and the various parameter lists of ATM etc.State when the channel parameters table of HDLC link is used for disposing the various characteristics of HDLC link and shows CPU processing HDLC link, the passage additional parameter table of HDLC link is used for disposing the buffer zone address of HDLC link in internal memory and the pointer address of initial buffering area.The attribute that the HDLC link can dispose comprises: byte order, adopt which kind of direct memory visit (DMA) mode, send which kind of frame etc. when whether using bit reversal, maximum frame size, Cyclic Redundancy Check type, line idle.

The position of the channel parameters table of HDLC link is fixed, and the channel parameters table of each HDLC link occupies 64 bytes, if 256 the tunnel will take: 256 * 64 bytes=16K byte, this will all take the resource of all 16K DPRAM of CPU.But in actual applications, the microcode that the DPRAM resource of CPU is supported the SS7 function has taken a part, and about 4K byte-sized is driven the about 1K byte of resource occupation by ATM again.In addition, because support the channel parameters table of every HDLC link of SS7 function will take 128 bytes of memory resources, so, if be supported the microcode of SS7 function and the ATM DPRAM of a part of storage resources that driven resource occupation, storage comprises the channel parameters table and the passage additional parameter table of the HDLC link of SS7 again, so Sheng Xia DPRAM resource part can not satisfy the system requirements of supporting 124 HDLC links in a conventional manner, therefore must the reasonable distribution resource to satisfy the requirement of 124 HDLC links of system's realization.

Since the channel parameters table of corresponding first HDLC link of first 64 byte of DPRAM, the channel parameters table of second 64 corresponding second the HDLC link of byte, and by that analogy.Therefore, driven resource occupation after the resource of a part of DPRAM at the microcode of supporting the SS7 function and ATM, the front tens tunnel of HDLC link just is not used, in the relevant position of the passage additional parameter table of HDLC link the clear area will appear like this, it is utilized again, as the channel parameters table of HDLC link, just can increase the attribute of several links of storage.Present embodiment is exactly the channel parameters table that these untapped resources is used to store the HDLC link, can support to comprise 130 HDLC links of 16 SS7 links, satisfies the system requirements of 124 HDLC links fully.What need indicate is: as common HDLC link, the channel parameters table of each HDLC link takies 64 bytes, support the channel parameters table of the HDLC link of SS7 function then to take 128 bytes, so in order to realize the dynamic-configuration of HDLC channel attributes, and do not influence other passages, will support the channel parameters table fixed placement of HDLC link of SS7 function in place since the 128th channel parameters table position.

Referring to Fig. 1, it is the memory allocation principle schematic of DPRAM among the CPU of the present invention.The A district distributes to the microcode of supporting the Signaling System Number 7 function for the region of memory of 0x0 to 0xfff; The B district is the region of memory of 0x1000 to 0x163f, distributes to the driving resource of asynchronous transfer mode; The C1 district is the region of memory of 0x1640 to 0x1abf, i.e. the channel parameters table of the HDLC link of channel number from 89 to 106, the attribute of 18 HDLC links of storage are distributed in clear area in the additional parameter table; The C2 district is the region of memory of 0x1ac0 to 0x1fff, distributes to the additional parameter table of the HDLC link of channel number from 88 to 255; The D district is the region of memory of 0x2000 to 0x27ff, distributes to the channel parameters table of the HDLC link of channel number from 128 to 159, the attribute of 16 HDLC links of storage; The E district is the region of memory of 0x2800 to 0x3fff, distributes to the channel parameters table of the HDLC link of channel number from 160 to 255, the attribute of 96 HDLC links of storage.Wherein SS7 can only be configured in channel number is the zone of 128-159, and PRI and B channel can dispose arbitrarily in C1, D, E zone without any restriction, but when in the D zone, being configured, still take zone of a size, i.e. 128 bytes with SS7.

In the C1 district, present 89 passages, 102-103 passage, 104-106 passage keep, and do not use in native system, and the 90-101 passage can be configured to PRI or B channel.

After in the HDLC link, having disposed SS7, PRI and ISDN B channel, carry out the transceive data of SS7, PRI and ISDN B channel and handle.At first, distinguish SS7, PRI and ISDN B channel from agreement.The second layer agreement of SS7 is Q703, and the second layer agreement of PRI is Q921, and what exist on the ISDN B channel is PPP(Point-to-Point Protocol), and characteristics difference, the especially Q703 of these three kinds of agreements and the service traffics difference of PPP are bigger.SS7 is in the transceive data state all the time, and its packet generally is the 20-30 byte, and this can handle the speech channel ability by it and calculate, and system requirements SS7 can handle 2-3 packet in 10ms, and processing mode is used inquiry mode.ISDN B channel generally is internet (Internet) business, its packet that runs above generally is tens to the hundreds of byte, the data that the ppp protocol that it is supported sends are surrounded by two kinds: negotiation of oneself and link maintenance bag, IP bag, send mode is by network layer and application layer decision, so have the characteristics of bursting property, a large amount of property, so processing mode is fit to adopt interrupt mode.And the packet that PRI handles generally also is the parcel of 20-30 byte, it has been determined that by factors such as protocol type, business characteristic and physical link bandwidth the frequency of giving out a contract for a project of the frequency ratio Q703 agreement of giving out a contract for a project of Q921 agreement is a lot of slowly, but the frequency of giving out a contract for a project than ppp protocol is fast, so the datagram of PRI is handled quantity between ISDN B channel and SS7 between the two, its datagram is handled quantity and is wanted much less than SS7, but it is big to handle quantity than the datagram of ISDN B channel.

The different characteristics of comprehensive above-mentioned three kinds of agreements, adopt the Data Receiving of 10ms inquiry mode treatment S S7, PRI and ISDN B channel in the present invention, adopt the transmission function treatment S S7 directly call physical layer and the data of PRI to send, adopt 10ms fixedly polling cycle the mode that adds an additional queries cycle handle the data transmission of ISDN B channel.From link transmission delay performance and efficient, the cycle that present embodiment is provided with additional queries is 30ms, its reason is: because the bandwidth of physical layer is the 8K byte, the parcel required time that sends one 64 byte is 8ms, in 30ms the time, have the packet of about 4 64 bytes to be sent out away, and 30ms add that 8ms is the maximum delay of the packet of each 64 byte, so the 30ms additional queries satisfies system for the demand that postpones.In system, 10ms inquiry and 30ms additional queries realize by startup 10ms and two cycle timers of 30ms in communication CPU.

Fig. 2 partly receives the flow chart of data processing in polling cycle at 10ms for the Data Receiving of SS7, PRI among the present invention and ISDN B channel.As shown in Figure 2, at first enter flow process 201 initial channel number is set, then enter flow process 202 and judge that current channel number is whether less than the largest passages of system's regulation number, if greater than, then enter flow process 215 and withdraw from circulation, otherwise enter flow process 203 judgements and work as whether prepass is SS7, PRI or B channel, if not, then enter flow process 204 current channel number is added 1 back Returning process 202, get the value in current receive buffer district and enter flow process 206 again current inquiry times zero clearing otherwise be introduced into flow process 205.Thereafter, enter flow process 207 and judge whether data are arranged in the reception data buffer, if do not have, then enter the pointer position that flow process 214 is preserved current buffering area, current channel number is added 1 back Returning process 202, otherwise enter the maximum inquiry times that flow process 208 judges that whether current inquiry times limits greater than passage, if greater than, then enter the pointer position that flow process 214 is preserved current buffering area, current channel number is added 1 back Returning process 202, current inquiry times is added 1 otherwise enter flow process 209, then enter flow process 210 and judge whether the reception data are wrong, if have, then enter flow process 212 and carry out fault processing, submit link layer process otherwise enter flow process 211.After handling through

flow process

211 or 212, enter the work of treatment of the buffering area that flow process 213 receives, Returning process 207 thereafter.

When offered load was overweight, the transmission data queue of leading to a certain destination in router can be long, even overflow, thereby constitute network congestion and cause packet loss.In order to guarantee service quality (QOS) and to realize the congested processing of bottom, the data that adopt interrupt mode to handle ISDN B channel usually send.Under interrupt mode, down trigger sends data division when only finishing by transmission, just can get buffered data from sending in the QOS formation, but having under the situation of a large amount of small data packets, because physical layer sends buffering area can not be too big, the situation that packet loss will occur, for service application, just show as performance decline.Therefore, the present invention increases new timer for realizing that the congested processing of QOS mode and bottom adopts inquiry mode, and directly calls the transmission function of physical layer by upper strata energisation mode again from the second layer, to obtain the data in the QOS formation.Present embodiment is on 10ms inquiry basis, has increased the 30ms additional queries again, is used to handle the data transmission of ISDN B channel, does not significantly increase for system processing power like this, and has satisfied the business demand of small data packets again.For all ISDN B channels, send data in buffering area by calling quality of service transport function (QosTransmit) at 10ms in polling cycle, in the 30ms additional queries cycle, call quality of service transport function more again and send data in the congested formation.The QosTransmit function is not when having the 30ms inquiry to send, be to call by the upper strata, belong to the upper strata and send excitation, regularly inquire about transmission by 30ms, can improve the transmission frequency, under the situation that has a large amount of parcels, can reduce the congested and packet loss that causes of formation, thereby improve the data transmit-receive performance.

Referring to Fig. 3, its data for ISDN B channel among the present invention send part at the process chart of 10ms in polling cycle, in the present embodiment, send message in the physical layer buffering area by calling quality of service transport function (QosTransmit) exactly.As shown in Figure 3, at first enter flow process 301 release physical layers and send buffering area, then enter flow process 302 and judge whether to meet physical layer transmission condition, if meet, then entering flow process 303 calls physical layer and sends function and send, otherwise enter flow process 304 and judge whether congested formation is empty: when congested formation is sky, enter flow process 306 and judge whether to meet physical layer transmission condition, the transmission condition of judging physical layer herein again is because after having passed through a period of time, the physical layer state may change, and need reaffirm the transmission condition of physical layer.If do not meet the transmission condition, then be introduced into flow process 313 and message is put into entered flow process 314 again after the congested formation and return congestion information, call physical layer and send function and send and enter flow process 312 again behind the message and return success state value otherwise be introduced into flow process 311; When congested formation is not sky, enter flow process 305 and judge whether congested formation is full, if full, then be introduced into flow process 307 and discharge and enter flow process 308 again behind the messages and return the information of abandoning, message is put into entered flow process 310 again after the congested formation and return congestion information otherwise be introduced into flow process 309.

Referring to Fig. 4, its data for ISDN B channel among the present invention send the process chart of part in the 30ms additional queries cycle, in the present embodiment, send message in the congested formation by calling 30ms additional transmissions function exactly.As shown in Figure 4, system at first enters flow process 401 release physical layers and sends buffering area, then enter flow process 402 and judge whether congested formation is empty, as be empty, then enter flow process 403 and return success state value, otherwise enter flow process 404 and in congested formation, get first bag, enter flow process 405 and judge whether to meet physical layer transmission condition thereafter, if meet, then being introduced into flow process 406 calls the quality of service transport function and sends and to enter flow process 407 again behind the message and return success state value, otherwise, be introduced into flow process 408 and data are reentered into enter flow process 409 again after the congested queue heads and return congestion information.

As seen, technical solution of the present invention is with the channel parameters table of resource idle in the passage additional parameter table of HDLC link as the HDLC link, in the channel parameters table of HDLC link, dispose more than one communications protocol, and adopt 10ms inquiry mode treatment S S7, the Data Receiving of PRI and ISDN B channel, the transmission function treatment S S7 of bottom is directly called in employing and the data of PRI send, adopt 10ms to inquire about the data transmission that the mode that adds a 30ms additional queries is handled ISDN B channel, in CPU, realized processing simultaneously to various protocols, improved the utilization ratio of cpu chip, increased the protocol capacity of CPU, realize making full use of of resource, and method of the present invention can also be carried out flexible configuration to the different attribute of HDLC link.

In a word, the above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.

Claims

1, a kind of method that realizes the various protocols processing on the communication central processing unit is characterized in that this method comprises the steps: at least

A, the idling-resource in the high speed data link control procedure link channel additional parameter table is distributed to the channel parameters table of high speed data link control procedure link, and in high speed data link control procedure link channel parameter list more than one communications protocol of configuration;

B, set in advance an additional queries cycle;

C, handle the Data Receiving of all communications protocol in polling cycle and contain small data packets and do not require that the data of the communications protocol that realizes congested processing send, handles the data transmission that contains big packet and require to realize the communications protocol of congested processing in the cycle in 10ms polling cycle and additional queries at 10ms;

Wherein, described packet size is determined according to bandwidth and transmission rate.

2, method according to claim 1 is characterized in that: the passage additional parameter table and the channel parameters table of the described high speed data link control procedure of steps A link are deposited in the memory of central processing unit inside.

3, method according to claim 1, it is characterized in that: the described communications protocol of steps A is the Signaling System Number 7 channel agreement, or primary rate interface channel agreement, or integrated services digital network channel agreement, or both or whole combinations arbitrarily in Signaling System Number 7 channel agreement, primary rate interface channel agreement and the integrated services digital network channel agreement.

4, according to claim 1 or 3 described methods, it is characterized in that: the channel parameters table of Signaling System Number 7 channel is fixedly set in the assigned address in the high speed data link control procedure channel parameters table section, and the channel parameters table of primary rate interface and integrated services digital network channel is arranged at the optional position in the high speed data link control procedure channel parameters table section.

5, method according to claim 4 is characterized in that: the original position of Signaling System Number 7 channel channel parameters table is arranged at the place, 0X2000 address of 16K double-port RAM in the central processing unit.

6, method according to claim 1 is characterized in that: containing small data packets and not requiring that the communications protocol that realizes congested processing is: the combination of Signaling System Number 7 channel agreement or primary rate interface channel agreement or Signaling System Number 7 channel agreement and primary rate interface channel agreement described in the step C; The described communications protocol that contains big packet and the congested processing of requirement realization is the integrated services digital network channel agreement.

7, according to claim 1 or 6 described methods, it is characterized in that: when handling the data transmission of integrated services digital network channel agreement, the additional queries cycle is set to 30ms.

8, method according to claim 1, it is characterized in that: when the data that step C contains big packet and require to realize the communications protocol of congested processing in processing send, handle transmission data in the physical layer buffering area in polling cycle at 10ms, handle transmission data in the congested formation in the cycle in additional queries.

9, method according to claim 8, the transmission data that it is characterized in that handling in the physical layer buffering area further comprise:

C11, release physical layer send buffering area;

10, method according to claim 9 is characterized in that: the congested processing described in the step C12 comprises following several steps:

11, method according to claim 8, the transmission data that it is characterized in that handling in the congested formation further comprise:

C21, release physical layer send buffering area;

C22, carry out congested processing.

12, method according to claim 11 is characterized in that: in step C22, judge that at first whether congested formation is empty, when congested formation is sky, returns success state value; When congested formation is not sky, in congested formation, get first bag, judge whether to meet physical layer thereafter and send condition, if meet, then call the quality of service transport function and send message, otherwise, data are reentered into congested queue heads.