CN101542988B - A method for transmitting the flow control information in the fixed-length packet exchange - Google Patents
A method for transmitting the flow control information in the fixed-length packet exchange Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
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- H—ELECTRICITY
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- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/35—Flow control; Congestion control by embedding flow control information in regular packets, e.g. piggybacking
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Abstract
The invention discloses a method for transmitting the flow control information in the fixed-length packet exchange, which is applied to the exchange part PSP and the physical layer PHY packet exchange device connected by the high speed SerDes HSS interface, the method includes: in the HSS link, adding the extending header to the service packet and the Idle packet transmitted between the PSP and the PHY device, and writing the flow control information of the Egress direction to the extending header of the service packet and the Idle packet transmitted from the PHY device to the PSP, writing the flow information of the Ingress direction to the extending header of the service packet and the Idle packet transmitted from the PSP to the PHY device. The invention needn't specially insert the Idle packet or other particular packet to transmit the flow control information between the PHY device and the PSP, it does not occupy the service packet exchange capacity of the PSP, and the transmission efficiency of the flow control information is much higher.
Description
Technical field
The present invention relates to the packet switching network field, the method that particularly a kind of fixed length packet switching Flow Control information transmits.
Background technology
Be accompanied by the fast development of Internet network, Packet Service has become the main body of communication network bearer service, and correspondingly, it is professional that the increasing network equipment directly adopts block exchange mode to transmit, simplify the processing procedure of professional transmission, reduced the construction cost of network.
Common PSD (Packet Switching Device, PSE), Packet Service is by PHY (Physical layer, physical layer) equipment inserts, MII (Media Independent Interface by different transfer rates, be independent of the interface of media) or SPI (System Packet Interface, system packet interface) is sent to PSP (Packet Switching Part, replacement part), traffic packets transmits by clock and data-signal, and flow-control information is by dedicated control signal or adopt in-band method to transmit.
When using MII or SPI to connect PHY equipment and PSP, hard connection signal each other is more, and require to adopt the connected mode of point-to-point, be not suitable for single PSP or connect PHY equipment as much as possible, limited the packet switching capacity of PSD to a certain extent by the packet switching veneer that PSP builds.
The interface of document and port are all at HSS.Interface is described the hardware annexation between PHY and the PSP; Port is described the packet switching of PSP inside.In this document, the grouping in the interface comprises overhead part and payload part; Grouping does not comprise overhead part in the port, only comprises payload part.
Usually, PSP is divided into a plurality of priority with the Packet Service that port receives, and divides into groups according to the priority scheduling of business, and high-priority service at first obtains service, embodies the otherness of different business.Under some situation, may require PSP to ensure the bandwidth of specific transactions.
Based on storage pass-through mode and output work queue is the main method that realizes the Packet Service exchange.The variable length characteristic of grouping and be that uncertain forwarding time delay has been introduced in packet switching to the statistic multiplexing of bandwidth resources.For the business of some delay sensitive, as real-time speech, time delay of introducing when adopting the variable length packet switching or delay variation may exceed the requirement of business self, cause professional service quality to descend even professional misfeed.
When PSP adopts the packet switching service of regular length, can if block length is less, can reduce the forwarding time delay of traffic packets according to fixedly time slot buffering and dispatching services, even, do not have when congested, can guarantee that each traffic packets forwarding time delay is identical.In the Ingress direction of PHY equipment to PSP, use logical block with the business separation of PHY equipment output or be filled to the grouping of regular length, in the Egress direction of PSP to PHY equipment, use logical block that the fixed length packets of PSP output is reverted to original form according to rightabout, the PSP that supports the fixed length packets exchange can be applied among the network switching equipment of transmitting the multiple business type, as be used to support IP (Internet Protocol, Internet protocol) packet switching, ATM (Asynchronous Transfer Mode, asynchronous transfer mode) cell switching, TDM (Time Division Multiplex, time division multiplexing) time gas exchange etc.
Ingress and Egress have embodied the flow direction of client's business at network or switching node, comprise two kinds of scenes:
End to end network: client's business inserts from the A point, is sent to the B point and is forwarded to professional destination node or uplink network continuation transmission afterwards, and the A point is referred to as the Ingress direction to B point direction; Otherwise, the B point is sent to the direction that A orders is referred to as the Egress direction.
Node is changed in single cross: the direction that business is input to replacement part is referred to as the Ingress direction, is referred to as the Egress direction from the direction of replacement part outgoing traffic.
Therefore, change node for single cross, PHY is to the corresponding Ingress direction of PSP, and PSP is to the corresponding Egress direction of PHY.
Technical merit according to present stage, single CML (Current Mode Logic, the current system logic) or LVDS (Low Voltage Differential Signaling, low-voltage differential signal transmission) differential lines to transmitting data message above 2.5Gbit/s.At single CML or LVDS differential lines the signal driver end is provided with Ser (Serializer, serializer), the signal receiver end is provided with Des (Deserializer, deserializer), can constitute a unidirectional HSS (High Speed SerDes) interface.If the traffic packets of regular length is carried out 8b-10b or other similar coding, adjacent a plurality of logical zeroes or " 1 " before and after occurring when avoiding serial transfer information, when not having service needed to transmit, insert the Idle (Idle identical with traffic packets length, empty) grouping, and Idle grouping assigned address arrange 8b-10b or other similarly in the coding not the control sequence of usefulness be used for the demarcation of fixed length grouping, like this, the operation exchange port that the HSS interface can be used for PSP improves the packet switching capacity of single PSP.Current, the PHY equipment of integrated this HSS interface and fixed length packet switching device have obtained commercialization.
When PSP uses the HSS interface in return during port, owing to no longer there is the hard signal that is connected that transmits flow-control information between PHY equipment and the PSP, relevant information must be by in the HSS link band or special-purpose physical channel is set transmits.Transmit the flow-control information mode in the existing HSS link band and need between traffic packets, force to insert the Idle grouping of carrying flow-control information, reduced the effective bandwidth of HSS link.When adopting special-purpose physical channel to transmit flow-control information, increased the complexity of switching equipment design.
Summary of the invention
The technical problem to be solved in the present invention provides the method that a kind of fixed length packet switching Flow Control information transmits, do not take the traffic packets exchange capacity, need not to adopt special physical channel, the efficient flow-control information that transmits between the PSP of assurance employing HSS interface and the PHY equipment.
In order to address the above problem, the invention provides the method that a kind of fixed length packet switching Flow Control information transmits, be applied to comprise that this method comprises the steps: by the replacement part PSP of high speed deserializer HSS interface connection and the PSE of physical layer PHY
On the HSS link, increase extended head in traffic packets that between PSP and PHY equipment, sends mutually and the idle Idle grouping, the flow-control information of Egress direction is write from PHY equipment send to the extended head of the traffic packets of PSP and Idle grouping; The flow-control information of Ingress direction write from PSP send to the extended head of the traffic packets of PHY equipment and Idle grouping.
Further, said method also can have following characteristics: the flow-control information of described Ingress direction, be written into the current traffic packets of output or the extended head of Idle grouping of being about to of all Egress HSS interfaces by PSP, be broadcast to all PHY equipment again; The flow-control information of described Egress direction is written into the current traffic packets of output or the extended head of Idle grouping of being about to of Ingress HSS interface by the Ingress direction of PHY equipment, is sent to the Ingress HSS interface of corresponding PSP again.
Further, said method also can have following characteristics: described flow-control information with the Egress direction writes from PHY equipment and sends to the extended head of the traffic packets of PSP and Idle grouping, comprising:
The formation that the sign of the HSS port clean culture priority service formation UPSQ of expression PHY equipment Egress direction and PSP or multicast priority service formation MPSQ is write the control information CInf of extended head is selected among the QSel of territory;
Egress direction export permit is write among the Egress direction export permit territory EOG of control information CInf of extended head.
Further, said method also can have following characteristics: send to the traffic packets of PSP from PHY equipment, also write professional classified information in the control information CInf of extended head byte, comprising:
The priority of current business packet forward is write among the Pri of priority territory;
Class of service is write among the TDM of time gas exchange territory, and described TDM is used to represent that current business packet bearer Packet Service still carries the TDM business;
The multicast type is write among the multicast domain MC, and described MC is used to represent that the current business grouping is multicast grouping or unicast packet.
Further, said method also can have following characteristics: send to the extended head of traffic packets of PSP from PHY equipment, also comprise byte from Wayfinding Signage SRT, the HSS port mapping of the corresponding PSP of each binary digit of described SRT byte, when certain two-symbol value in the SRT byte was the value of this HSS mapped port upstate of expression, the grouping of expression current business was exported by corresponding HSS port; When the value of a plurality of binary digits in the SRT byte was the value of this HSS mapped port upstate of expression, the grouping of expression current business was multicasted to corresponding a plurality of HSS port.
Further, said method also can have following characteristics:
When EOG was the value of expression upstate, for the PHY equipment that sends current I ngress direction traffic packets, the UPSQ or the MPSQ of the Egress direction signs that indication QSel selects can import grouping; For the HSS port of the PSP that receives current I ngress direction traffic packets, the UPSQ or the MPSQ of indication QSel sign can export grouping;
When EOG was the value of expression down state, for the PHY equipment that sends current I ngress direction traffic packets, the UPSQ of the Egress direction signs that indication QSel selects or MPSQ forbade importing grouping; For the HSS port of the PSP that receives current I ngress direction traffic packets, the UPSQ or the MPSQ of indication QSel sign forbid the output grouping.
Further, said method also can have following characteristics: for any PHY equipment, send to the traffic packets of PSP and the Idle shared QSel counter that divides into groups from PHY equipment, this counter is used for indicating in turn the flow control information of the different priorities formation of corresponding HSS port, each Ingress HSS link packet transmits time slot, the QSel counter adds 1 automatically, when being maximum N, adding 1 and turns back to 0; When PHY equipment I ngress HSS interface sends traffic packets or Idle grouping at every turn, QSel counter currency is mapped to the QSel territory of packet expansion head, the UPSQ of the Egress direction correspondence of being selected by current QSel or the flow-control information of MPSQ are mapped to the EOG territory of packet expansion head, and wherein N represents that the number of this PHY equipment Egress direction formation subtracts 1.
Further, said method also can have following characteristics: the flow-control information of Ingress direction is write from PSP send to the extended head of the traffic packets of PHY equipment and Idle grouping, comprising:
The overall formation that the sign of the overall clean culture priority service formation TUPSQ of expression PSP all HSS ports and all PHY equipment I ngress directions or overall multicast priority service formation TMPSQ is write the control information CInf of extended head is selected among the TQSel of territory;
Ingress direction import admission is write among the Ingress direction import admission territory IIG of control information CInf of extended head;
The HSS output port of PSP is mapped to the value that specific binary digit in Wayfinding Signage SRT is set to upstate or down state and writes in the binary digit of SRT correspondence.
Further, said method also can have following characteristics: send to the traffic packets of PHY equipment from PSP, also write professional classified information in the control information CInf of extended head byte, comprising:
The priority of current business packet forward is write among the Pri of priority territory;
Class of service is write among the TDM of time gas exchange territory, and described TDM is used to represent that current business packet bearer Packet Service still carries the TDM business;
The multicast type is write among the multicast domain MC, and described MC is used to represent that the current business grouping is multicast grouping or unicast packet.
Further, said method also can have following characteristics: when one or more binary digits of SRT value for the expression upstate, and when IIG is the value of expression formation upstate, for the PSP that sends the current business grouping, indication TQSel is that the TUPSQ or the TMPSQ of corresponding HSS port-mark can divide into groups by incoming traffic; For the PHY equipment that receives the current business grouping, the TUPSQ of the Ingress direction signs that indication TQSel selects or TMPSQ can divide into groups by outgoing traffic; When one or more binary digits of SRT value for the expression down state, for the PSP that sends the current business grouping, indication TQSel is that the TUPSQ or the TMPSQ of corresponding HSS port-mark forbids the incoming traffic grouping; For the PHY equipment that receives the current business grouping, the TUPSQ of the Ingress direction signs that indication TQSel selects or TMPSQ forbid the outgoing traffic grouping, and be irrelevant with the IIG currency.
Further, said method also can have following characteristics: for all Egress HSS interfaces of PSP, send to the traffic packets of PHY equipment and the Idle shared TQSel counter that divides into groups from PSP, each Egress HSS link packet transmits time slot, the TQSel counter adds 1 automatically, when being maximum N, adding 1 and turn back to 0; When any Egress HSS of PSP interface sends traffic packets or Idle grouping at every turn, TQSel counter currency is mapped to the TQSel territory of packet expansion head, the TUPSQ of the Ingress direction correspondence of being selected by current TQSel or the flow-control information of TMPSQ are mapped in the binary digit of the IIG territory of packet expansion head and SRT, wherein, wherein N represents that this PSP medium priority formation classification number subtracts 1.
The present invention does not need to insert specially the flow-control information between Idle grouping or other particular packet transmission PHY equipment and the PSP, do not take the traffic packets exchange capacity of PSP, and the flow-control information transmission efficiency is higher.
Summary of drawings
Fig. 1 is the transfer path schematic diagram of embodiment of the invention packet switching Flow Control information;
Fig. 2 is an embodiment of the invention Ingress direction traffic packets information structure diagram;
Fig. 3 is an embodiment of the invention Ingress direction Idle grouping information structure chart;
Fig. 4 is an embodiment of the invention Egress direction traffic packets information structure diagram;
Fig. 5 is an embodiment of the invention Egress direction Idle grouping information structure chart.
Better embodiment of the present invention
The present invention is the flow-control information between the traffic packets of utilizing regular length on the HSS link and Idle grouping delivery PSP and PHY equipment, wherein, PHY is sent to all PHY equipment to the Ingress direction flow-control information of the PSP Egress HSS interface by PSP, and PSP is sent to the corresponding Ingress HSS of PSP interface to the Egress direction flow-control information of PHY equipment by PHY equipment.
The present invention is described in further detail below in conjunction with drawings and Examples.
Fig. 1 is the transfer path schematic diagram of embodiment of the invention packet switching Flow Control information, and dotted line has been described the transit area of flow-control information.
PSP based on the output port queuing, adopts the HSS interface to connect PHY equipment according to the fixed length packet switching service.Traffic packets transmits continuously by 8b-10b or other back serial on the HSS link of similarly encoding.The HSS link is according to the grouping of time division multiplexing mode transport service, and when not having traffic packets to transmit, the HSS interface inserts the Idle grouping automatically.Delimit the grouping that the HSS link transmits by 8b-10b or other control sequence of similarly encoding of arranging in Idle grouping fixed position not to be used.
Ingress FC (Ingress Flow Control, Ingress direction Flow Control) information stems from the queue resource operating position of PSP inside, PSP must be with the current resource upstate of each each formation of HSS port, be broadcast to the Egress HSS interface of all PHY equipment by the Egress direction, be sent to the Ingress direction of this PHY equipment again by FCSig (Flow Control Signals, flow control signal) by each PHY equipment Egress direction.Egress FC (Egress Flow Control, Egress direction Flow Control) information stems from the queue resource operating position of corresponding PHY equipment Egress direction, PHY equipment must be with Egress direction queue resource upstate, be sent to the Ingress direction of this PHY equipment by FCSig, be sent to the Ingress HSS interface of PSP correspondence again by the Ingress direction.
The formation of PSP inside is the connection tie of Ingress direction to the Egress direction, and a formation of PSP inside can cushion the information that comes from a plurality of Ingress direction HSS ports; A formation of PSP inside can only output to an Egress direction HSS port, promptly adopts output work queue's mode.
Usually, each HSS port of PSP and each PHY equipment are divided into a plurality of priority with unicast service, and are independently formation of each priority service distribution; And then each HSS port of PSP and each PHY equipment also are divided into a plurality of priority with multicast service, and are the formation of every multicast priority service distributing independent.For this reason, in the Ingress direction, be necessary for each clean culture priority service formation of each PHY equipment and each multicast priority service formation of each PHY equipment and transmit Egress FC information, EgressFC information tells whether PSP can send traffic packets to PHY, reflected that PHY output buffering takies situation, in the inner generation of PHY.Therefore, Egress FC information will be sent to PSP through the Ingress direction by PHY; In the Egress direction, be necessary for each the clean culture priority service formation of each HSS port of PSP, each multicast priority service formation transmits Ingress FC information with each HSS port of PSP, Ingress FC information tells whether PHY can send traffic packets to PSP, the formation occupancy that has reflected PSP inside, in the inner generation of PSP, therefore, be sent to PHY through the broadcasting of Egress direction by PSP.
In the present embodiment, the grouping that the HSS link transmits is made up of CInf (Control Information, control information) byte, two SRT (Self-Route Tags is from Wayfinding Signage) byte, some PL (Payload, payload) byte.Wherein, Cinf, SRT (0), SRT (1) form the extended head of grouping, are used to transmit the classified information of flow-control information and traffic packets.The PL regions carry business datum of traffic packets.Untapped 8b-10b or other control sequence of similarly encoding are inserted in the PL zone of Idle grouping, are used for the HSS interface and delimit grouping.HSS link packet length can not be less than 5 bytes.
Fig. 2 is an Ingress direction traffic packets information structure diagram, two Pri (Priority, priority) binary digit of Cinf byte is used to identify the forwarding priority of current business grouping, and is as shown in table 1, comprise 4 priority levels, distinguish called after Pri0, Pri1, Pri2, Pri3 from high to low.QSel (Queue Select, formation is selected) be used for identifying UPSQ (the Unicast Priotity Service Queue of the corresponding HSS port of PHY equipment Egress direction (this port is that SRT is 1 port) with PSP, the formation of clean culture priority service) and MPSQ (Multicast Priority Service Queue, the formation of multicast priority service), as shown in table 2.Wherein, UPSQ comprises 4 priority, 4 clean culture priority services of corresponding Egress direction formation respectively; MPSQ also comprises 4 priority, 4 multicast priority services of corresponding Egress direction formation respectively.TDM indicating services classification is the PL carrying Packet Service of 0 o'clock indication current group, is the PL carrying TDM business of 1 o'clock indication current group.MC (Multicast, multicast) is 1 o'clock, and the indication current group is the multicast grouping, and MC is 0 o'clock, and the indication current group is a unicast packet.For the traffic packets that is sent to PSP inside (Ingress direction) from PHY, MC is 0 o'clock, and traffic packets deposits UPSQ in; MC is that 1 o'clock traffic packets deposits MPSQ in.EOG (Egress Output Grant, Egress direction export permit) must be used in combination with QSel, when EOG was 1, for the PHY equipment that sends current I ngress direction traffic packets, the UPSQ or the MPSQ of the Egress direction signs that indication QSel selects can import grouping; For the HSS port of the PSP that receives current I ngress direction traffic packets, the UPSQ or the MPSQ of indication QSel sign can export grouping.When EOG was 0, for the PHY equipment that sends current I ngress direction traffic packets, the UPSQ or the MPSQ of the Egress direction signs of indication QSels sign forbade the input grouping; For the HSS port of the PSP that receives current I ngress direction traffic packets, the UPSQ of the Egress direction signs that indication QSel selects or MPSQ forbid the output grouping.
Table 1
Table 2
The HSS port mapping of the corresponding PSP of each binary digit of SRT byte, certain binary location 1, the grouping of indication current business is by corresponding HSS port output.When a plurality of binary location 1, the indication current group is multicasted to corresponding a plurality of HSS port.For example, when P (0) was 1, the grouping of indication current business was by the output of HSS (0) port; When P (0) was 0, the grouping of indication current business was not by the output of HSS (0) port.
Fig. 3 is the information structure diagram of Ingress direction Idle grouping.Because any business datum is not carried in the Idle grouping, PSP does not need it is cushioned and transmits.Idle packet expansion head Cinf byte is only used QSel and two territories of EOG, and implication and Ingress direction traffic packets are identical, and the territory that other classified information is relevant (comprising the forwarding priority, class of service, multicast indication of grouping etc.) value is left 0.The HSS port mapping information that SRT comprises does not have practical use, all is left 0.
The payload area of Ingress direction Idle grouping inserts 8b-10b or other untapped control sequence of similarly encoding, and is used for PSP Ingress HSS interface and delimits grouping.For example, when PSP Ingress HSS interface detects K28.5 as 8b-10b coding, D16.2 sequence, just can determine the border that the HSS link next one divides into groups immediately.
For any PHY equipment, the traffic packets of Ingress direction and the Idle shared QSel counter that divides into groups, this counter are used for indicating in turn the flow control information of the different priorities formation of corresponding HSS port.Each Ingress HSS link packet transmits time slot, and the QSel counter adds 1 automatically, when being maximum 7, adding 1 and turns back to 0.When PHY equipment I ngress HSS interface sends traffic packets or Idle grouping at every turn, QSel counter currency is mapped to the QSel territory of packet expansion head, and the UPSQ of the Egress direction signs of being selected by current QSel or the flow-control information of MPSQ are mapped to the EOG territory of packet expansion head.As can be seen, per 8 the Ingress HSS link packet transmission of the flow-control information of any priority query of Egress direction time slot is refreshed once.
Because each the priority service formation of each HSS port of PSP can be from any PSP IngressHSS port incoming traffic grouping, therefore, in the Egress direction, must adopt broadcast mode the Ingress FC information of each each priority service formation of HSS port of PSP to be sent to the HSS interface of all PHY equipment I ngress directions.
Fig. 4 is an Egress direction traffic packets information structure diagram.
The definition of the Pri of Cinf byte, TDM, MC thresholding is identical with the traffic packets of Ingress direction.
TQSel (Total Queue Select, overall formation is selected) be used to identify TUPSQ (the Total Unicast Priotity Service Queue of all HSS ports of PSP and all PHY equipment I ngress directions, overall clean culture priority service formation) and TMPSQ (Total Multicast Priority Service Queue, overall multicast priority service formation), as shown in table 3.Wherein, TUPSQ comprises 4 priority, respectively 4 clean culture priority services formation of all HSS ports of corresponding PSP and all PHY equipment I ngress directions; MPSQ also comprises 4 priority, respectively 4 multicast priority services formation of all HSS ports of corresponding PSP and all PHY equipment I ngress directions.
IIG (Ingress Input Grant, Ingress direction import admission) must be used in combination with TQSel and SRT.Owing to always be sent to known PHY equipment from the Egress direction traffic packets and the Idle grouping of PSP output, it is any from pathfinding information no longer to need grouping to carry, the SRT byte of Egress direction traffic packets will be used to transmit Ingress FC information, promptly belong to flow-control information.
The HSS port mapping of the corresponding PSP of each binary digit of SRT byte.When one or more binary digits of SRT are 1, and IIG is 1, and for the PSP that sends the current business grouping, indication TQSel is that the TUPSQ of corresponding HSS port-mark or TMPSQ can the incoming traffic groupings; For the PHY equipment that receives the current business grouping, the TUPSQ of the Ingress direction of indication TQSel sign or TMPSQ can the outgoing traffic groupings.When one or more binary digits of SRT were 0, for the PSP that sends the current business grouping, indication TQSel was that the TUPSQ or the TMPSQ of corresponding HSS port-mark forbids the incoming traffic grouping; For the PHY equipment that receives the current business grouping, the TUPSQ or the TMPSQ of the Ingress direction of indication TQSel sign forbid the outgoing traffic grouping, and be irrelevant with the IIG currency.For example, when P (2), P (5), the P (8) of SRT byte are 1, other binary digit of SRT byte is 0, TQSel (2:0) equals 3, IIG is 1 o'clock, HSS (2), the HSS (5) of these information indication PSP, the clean culture Pri3 formation of HSS (8) port are current can the incoming traffic grouping, and the clean culture Pri3 formation of other HSS port of PSP is current forbids the input grouping; Be connected to current can the grouping by outgoing traffic of clean culture Pri3 formation of each PHY equipment I ngress direction of PSP HSS (2), HSS (5), HSS (8) port, the current outgoing traffic of forbidding of clean culture Pri3 formation that is connected to each PHY equipment I ngress direction of other HSS port of PSP divides into groups.
Table 3
For the concrete indicating means of above-mentioned flow-control information, also can there be one to become example, be set to 8 bit as the EOG territory, each bit is corresponding to the upstate of a formation.The state indication can have more real-time like this, does not also need counter, also is feasible.
Fig. 5 is an Egress direction Idle grouping information structure chart.Because any business information is not carried in the Idle grouping, PHY equipment does not need its buffering and transmission.The Cinf byte of Idle packet expansion head is only used TQSel and two territories of IIG, and implication and Egress traffic packets are identical.The information that SRT comprises is also identical with the Egress traffic packets with usage.
The payload area of Ingress direction Idle grouping inserts 8b-10b or other untapped control sequence of similarly encoding, and is used for PHY Egress HSS interface and delimits grouping.For example, when PHY Egress HSS interface detects K28.5 as 8b-10b coding, D16.2 sequence, just can determine the border that the HSS link next one divides into groups immediately.
For all Egress HSS interfaces of PSP, Egress direction traffic packets and the Idle shared TQSel counter that divides into groups.Every Egress HSS link packet transmits time slot, and the TQSel counter adds 1 automatically, when being maximum 7, adding 1 and turns back to 0.When any Egress HSS of PSP interface sends traffic packets or Idle grouping at every turn, TQSel counter currency is mapped to the TQSel territory of packet expansion head, as long as there is such HSS port in PSP, promptly select the TUPSQ or the TMPSQ of the Ingress direction of (promptly identifying) to divide into groups by incoming traffic by TQSel, then IIG is put 1, and, the binary location 1 of corresponding these HSS ports of SRT, other binary location 0.For all HSS ports of PSP, if the TUPSQ or the TMPSQ of the Ingress direction signs of being selected by current TQSel forbid the incoming traffic grouping, each binary bit of SRT correspondence puts 0, and IIG can be 0 or 1.Be not difficult to find out that per 8 the Egress HSS link packet of the flow-control information of all each priority queries of Ingress direction transmit time slot and are refreshed once.
For the Ingress direction, there is a kind of special situation, when each binary digit of the SRT of traffic packets extended head byte was 0, PSP can not determine the Egress HSS port of this traffic packets.PSP and PHY equipment may be with this Ingress direction traffic packets as special purposes.For this special traffic packets, require the QSel of its extended head Cinf byte and EOG identical with the definition and the usage of other traffic packets of Ingress direction.For example, to have processor or director port can be complete 0 indication with SRT in PSP inside.From transmitting the angle of flow-control information, this special traffic packets is equivalent to other traffic packets of Ingress direction.
The TDM business can not prioritization.The characteristics of transmitting according to fixing time slot according to the TDM business, TDM, the QSel of extended head Cinf byte or TQSel, IIG or EOG can be used in combination with the SRT byte, specific practice is, clean culture Pri0 and multicast Pri0 business that the corresponding HSS port forwarding of PSP is set are the TDM business, and the TDM of corresponding service packet expansion head puts 1.Transmit for this professional Ingress FC information, always to force IIG be 1 and force the corresponding binary digit of SRT (referring to transmit the binary digit of the HSS port of TDM business in the SRT correspondence) to put 1; Transmit for this professional Egress FC information, always forcing EOG is 1, guarantees the professional real-time of transmitting of TDM.
The embodiment of the invention only is used for understanding better the present invention, and the content of described extended head is not limited to concrete arrangement mode, shared pro forma variations such as figure place.For those of ordinary skills, can make various possible changes or replacement according to the explanation and the embodiment of technical scheme of the present invention, all these changes or replacement all belong to the protection range of claim of the present invention.
Industrial applicibility
The present invention can be used for comprising by the PSP of HSS interface connection and the PSE of PHY, utilize the traffic packets of regular length and the flow-control information between Idle grouping delivery PSP and the PHY equipment at the HSS link, do not need to insert specially the flow-control information between Idle grouping or other particular packet transmission PHY equipment and the PSP, do not take the traffic packets exchange capacity of PSP, and the flow-control information transmission efficiency is higher.
Claims (11)
1. the method that fixed length packet switching Flow Control information transmits is applied to comprise that this method comprises the steps: by the replacement part PSP of high speed deserializer HSS interface connection and the PSE of physical layer PHY
On the HSS link, increase extended head in traffic packets that between PSP and PHY equipment, sends mutually and the idle Idle grouping, the flow-control information of Egress direction is write from PHY equipment send to the extended head of the traffic packets of PSP and Idle grouping; The flow-control information of Ingress direction write from PSP send to the extended head of the traffic packets of PHY equipment and Idle grouping.
2. method according to claim 1, it is characterized in that, the flow-control information of described Ingress direction is written into the current traffic packets of output or the extended head of Idle grouping of being about to of all Egress HSS interfaces by PSP, is broadcast to all PHY equipment again; The flow-control information of described Egress direction is written into the current traffic packets of output or the extended head of Idle grouping of being about to of Ingress HSS interface by the Ingress direction of PHY equipment, is sent to the Ingress HSS interface of corresponding PSP again.
3. method according to claim 1 is characterized in that, described flow-control information with the Egress direction writes from PHY equipment and sends to the extended head of the traffic packets of PSP and Idle grouping, comprising:
The formation that the sign of the HSS port clean culture priority service formation UPSQ of expression PHY equipment Egress direction and PSP or multicast priority service formation MPSQ is write the control information CInf of extended head is selected among the QSel of territory;
Egress direction export permit is write among the Egress direction export permit territory EOG of control information CInf of extended head.
4. method according to claim 1 is characterized in that, sends to the traffic packets of PSP from PHY equipment, also writes professional classified information in the control information CInf of extended head byte, comprising:
The priority of current business packet forward is write among the Pri of priority territory;
Class of service is write among the TDM of time gas exchange territory, and described TDM is used to represent that current business packet bearer Packet Service still carries the TDM business;
The multicast type is write among the multicast domain MC, and described MC is used to represent that the current business grouping is multicast grouping or unicast packet.
5. method according to claim 1, it is characterized in that, send to the extended head of traffic packets of PSP from PHY equipment, also comprise byte from Wayfinding Signage SRT, the HSS port mapping of the corresponding PSP of each binary digit of described SRT byte, when certain two-symbol value in the SRT byte was the value of this HSS mapped port upstate of expression, the grouping of expression current business was exported by corresponding HSS port; When the value of a plurality of binary digits in the SRT byte was the value of this HSS mapped port upstate of expression, the grouping of expression current business was multicasted to corresponding a plurality of HSS port.
6. method according to claim 3 is characterized in that,
When EOG was the value of expression upstate, for the PHY equipment that sends current I ngress direction traffic packets, the UPSQ or the MPSQ of the Egress direction signs that indication QSel selects can import grouping; For the HSS port of the PSP that receives current I ngress direction traffic packets, the UPSQ or the MPSQ of indication QSel sign can export grouping;
When EOG was the value of expression down state, for the PHY equipment that sends current I ngress direction traffic packets, the UPSQ of the Egress direction signs that indication QSel selects or MPSQ forbade importing grouping; For the HSS port of the PSP that receives current I ngress direction traffic packets, the UPSQ or the MPSQ of indication QSel sign forbid the output grouping.
7. method according to claim 3, it is characterized in that, for any PHY equipment, send to the traffic packets of PSP and the Idle shared QSel counter that divides into groups from PHY equipment, this counter is used for indicating in turn the flow control information of the different priorities formation of corresponding HSS port, and each IngressHSS link packet transmits time slot, and the QSel counter adds 1 automatically, when being maximum N, adding 1 and turn back to 0; When PHY equipment I ngress HSS interface sends traffic packets or Idle grouping at every turn, QSel counter currency is mapped to the QSel territory of packet expansion head, the UPSQ of the Egress direction correspondence of being selected by current QSel or the flow-control information of MPSQ are mapped to the EOG territory of packet expansion head, and wherein N represents that the number of this PHY equipment Egress direction formation subtracts 1.
8. method according to claim 1 is characterized in that, the flow-control information of Ingress direction is write from PSP send to the extended head of the traffic packets of PHY equipment and Idle grouping, comprising:
The overall formation that the sign of the overall clean culture priority service formation TUPSQ of expression PSP all HSS ports and all PHY equipment I ngress directions or overall multicast priority service formation TMPSQ is write the control information CInf of extended head is selected among the TQSel of territory;
Ingress direction import admission is write among the Ingress direction import admission territory IIG of control information CInf of extended head;
The HSS output port of PSP is mapped to the value that specific binary digit in Wayfinding Signage SRT is set to upstate or down state and writes in the binary digit of SRT correspondence.
9. method according to claim 1 is characterized in that, sends to the traffic packets of PHY equipment from PSP, also writes professional classified information in the control information CInf of extended head byte, comprising:
The priority of current business packet forward is write among the Pri of priority territory;
Class of service is write among the TDM of time gas exchange territory, and described TDM is used to represent that current business packet bearer Packet Service still carries the TDM business;
The multicast type is write among the multicast domain MC, and described MC is used to represent that the current business grouping is multicast grouping or unicast packet.
10. method according to claim 8, it is characterized in that, when one or more binary digits of SRT value for the expression upstate, and when IIG is the value of expression formation upstate, for the PSP that sends the current business grouping, indication TQSel is that the TUPSQ or the TMPSQ of corresponding HSS port-mark can divide into groups by incoming traffic; For the PHY equipment that receives the current business grouping, the TUPSQ of the Ingress direction signs that indication TQSel selects or TMPSQ can divide into groups by outgoing traffic; When one or more binary digits of SRT value for the expression down state, for the PSP that sends the current business grouping, indication TQSel is that the TUPSQ or the TMPSQ of corresponding HSS port-mark forbids the incoming traffic grouping; For the PHY equipment that receives the current business grouping, the TUPSQ of the Ingress direction signs that indication TQSel selects or TMPSQ forbid the outgoing traffic grouping, and be irrelevant with the IIG currency.
11. method according to claim 8, it is characterized in that, all EgressHSS interfaces for PSP, send to the traffic packets of PHY equipment and the Idle shared TQSel counter that divides into groups from PSP, each Egress HSS link packet transmits time slot, the TQSel counter adds 1 automatically, when being maximum N, adding 1 and turns back to 0; When any Egress HSS of PSP interface sends traffic packets or Idle grouping at every turn, TQSel counter currency is mapped to the TQSel territory of packet expansion head, the TUPSQ of the Ingress direction correspondence of being selected by current TQSel or the flow-control information of TMPSQ are mapped in the binary digit of the IIG territory of packet expansion head and SRT, and wherein N represents that this PSP medium priority formation classification number subtracts 1.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2007/000569 WO2008098422A1 (en) | 2007-02-15 | 2007-02-15 | A method for transmitting the flow control information in the fixed-length packet exchange |
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| CN101542988A CN101542988A (en) | 2009-09-23 |
| CN101542988B true CN101542988B (en) | 2011-07-13 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1419767A (en) * | 2000-04-13 | 2003-05-21 | 国际商业机器公司 | Method and system for scheduling information using disconnection/reconnection of network server |
| CN1708030A (en) * | 2004-06-11 | 2005-12-14 | 华为技术有限公司 | System for controlling packet service network flow and method thereof |
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| JP2003018204A (en) * | 2001-07-02 | 2003-01-17 | Hitachi Ltd | Packet transfer device provided with flow detection function and flow management method |
| US20040264452A1 (en) * | 2003-06-25 | 2004-12-30 | Gaurav Mittal | Apparatus, and associated method, for embedding control information into packet formatted data |
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- 2007-02-15 WO PCT/CN2007/000569 patent/WO2008098422A1/en active Application Filing
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1419767A (en) * | 2000-04-13 | 2003-05-21 | 国际商业机器公司 | Method and system for scheduling information using disconnection/reconnection of network server |
| CN1708030A (en) * | 2004-06-11 | 2005-12-14 | 华为技术有限公司 | System for controlling packet service network flow and method thereof |
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| WO2008098422A1 (en) | 2008-08-21 |
| CN101542988A (en) | 2009-09-23 |
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