CN100488175C - Serial tandem connection bus up flow control method and node equipment - Google Patents
Serial tandem connection bus up flow control method and node equipment Download PDFInfo
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Abstract
The invention relates to a serial cascade ascending flow control method and relative node device, which can self-adaptive adjust the bandwidth of node when the serial cascade ascending node number changes. Wherein, each node based on the total bandwidth of serial cascade bus and the total node number of cascade connection fixes the basic bandwidth of local node, and based on the node position calculates the sum of basic bandwidths of next node and local node, to obtain the upper sending limit of local node; then the node of each cascade buffers the data of next node, to send the bandwidth not higher than upper sending limit, to send buffered data and the sent data of said node to the superior node; and each node based on the basic bandwidth fixes the data amount applied in said node, to control the data amount uploaded by each node.
Description
Technical field
The present invention relates to the communications field, particularly the fluidics of serially concatenated bus.
Background technology
In various communication systems, cascade network is a kind of very general networking mode.In cascade network, can comprise a host node (Master Node, be called for short " MN ") and it is a plurality of from node (Slave Node is called for short " SN "), the interface by the connection link between these nodes connects to form the network of different topology types such as star, chain, ring-like or tree type.
In cascade network, each node all can comprise at least one transmit port and at least one receiving port, adjacent node connects by the link between the port, and the General Definition host node to being down direction, is a up direction from node to the host node direction to slave node side.
Host node is also referred to as root node, last that is in down direction is also referred to as leaf node from node, be in the superior node (father node) that an adjacent node on the node up direction is called this node, be in the downstream site (child node) that an adjacent node on the node down direction is called this node.In communication network especially packet network, adopt the mode of hop to hop (hop-to-hop) to transmit usually, wherein, each jumping (hop) has identified the direct-connected one way link set between two nodes.
In Modern Communication System, especially in the cascade network scheme of distributed base station equipment, be that the high speed serialization link interface by cable or bearing optical fiber connects usually between each node, so the serially concatenated bus obtain more prevalent application.
Fig. 1 illustrates the application of serially concatenated bus, the Serdes among the figure, and promptly SERializer (serializer)/DESerializer (deserializer) is the mainstream technology of high-speed interface at present.It is a kind of time division multiplexing (Time Division Multiplexing, abbreviation " TDM ") point-to-point communication technology, be converted into high-speed serial signals in transmitting terminal multi-path low speed parallel data, transmission through medium optical fiber, coaxial cable is resumed at the receiving terminal high-speed serial data at last and converts the low-speed parallel data to.The Serdes function is formed by sending and receiving: the sendaisle circuit mainly by coding circuit, clock generation circuit, and string is changed and serial transmitter is formed; The receive path circuit mainly is made up of receiver, clock recovery, string and conversion and decoding circuit.
By above-mentioned Serdes function, form serially concatenated bus structures between main equipment among Fig. 1 and the slave unit.In the serially concatenated bus run, mainly constitute i.e.: user data channel, control data passage, and synchronizing information passage by three logical channels.
Above-mentioned three logical channels are shared by main equipment among the figure and slave unit.Specifically, main equipment transmits the forward direction user face data by user data channel, and slave unit transmits reverse user face data by this passage to main equipment, as the IQ data; Main equipment is controlled slave unit by setting the relevant address information of control data, and slave unit utilizes this passage to the main equipment data feedback control.Control data generally is divided into physical layer control information and high-rise control information, and what the present invention related generally to is high-rise control information.
It is to be noted, 3G (Third Generation) Moblie (The Third Generation, abbreviation " 3G ") base station open interface platform development alliance is in order to solve the unmatched problem of interface between the distinct device manufacturer, developed common public radio interface (Common Public Radio Interface, be called for short " CPRI ") standard, the defined radio equipment controller of this standard (Radio Equipment Controller, be called for short " REC ") and wireless device (Radio Equipment, abbreviation " RE ") interface between, be a kind of interface of cascade network, be called the CPRI interface.
Wherein, REC is the host node in the cascade network, and for example in the WCDMA distributed base station, main equipment is corresponding REC.
RE be in the cascade network from node, for example in the WCDMA distributed base station, slave unit is corresponding RE.
Fig. 2 illustrates the logical model of CPRI interface.Wherein, according to the difference of CPRI port function, in the CPRI standard, the CPRI port is divided into master port (Master Port, be called for short " M ") and from port (Slave Port is called for short " S ").The M port is used to send data, and the S port is used to receive data.
More than to the CPRI interface between the master-slave equipment in cascade network technology, serially concatenated bus structures and the cascade network roughly situation be illustrated, next provide relevant diagram further the control data in agreement framework, frame definition form and the CPRI superframe of CPRI interface to be disclosed, so that the present invention can be better understood.
CPRI interface protocol framework as shown in Figure 3.Wherein Ethernet (Ethernet) and High-Level Data Link Control (High-Level Data Link Control is called for short " HDLC ") mainly is the high-rise control data of carrying, finishes the communication carrier function between main equipment and the slave unit.
CPRI frame definition form as shown in Figure 4.Wherein, base-station node frame number (Node B FrameNumber is called for short " BFN ") is basic frame of 10ms among the WCDMA.Wherein darker regions is the control data territory.
The control data definition as shown in Figure 5 in the CPRI superframe.The data that Fig. 6 illustrates after the serialization distribute.
In order to discern cascade RE, proposed on the basis of CPRI agreement, to expand at present, adopt the algorithm that distributes automatically based on Hop, referring to Fig. 7, wherein, each RE knows progression Hoptotal total on the current cascade bus and the progression Hop of self.
The CPRI standard has defined multi-frame structure on high-speed serial bus, multiplexing different passage comprises the Operation and maintenance link passage, data carried by data passage (as baseband I Q data) etc.Wherein, multi-frame structure is a kind of comparatively combination of complicated frame data, in multi-frame, can comprise control word and data simultaneously, be similar to the CPRI standard, in the mode of a lot of cascade networks, can adopt the structure Data transmission of multi-frame between the node, especially in the Modern Communication System, on the more and more data link, data send with the form of multi-frame.Table 1 illustrates the composition of multi-frame in the CPRI standard, Hop field wherein, the descending Hop+1 that fills out, the up Hoptotal that fills in.
| Sub-Channel Number | The subchannel purpose | X s＝0 | X s＝1 | X s＝2 | X s＝3 |
| 0 | Synchronization timing | Sync byte K28.5 | HFN | The BFN-low byte | The BFN- |
|
| 1 | Control maintenance channel at a slow speed | Control maintenance channel at a slow speed | Control maintenance channel at a slow speed | Control maintenance channel at a slow speed | Control maintenance channel at a |
|
| 2 | Agreement in layer one band | Version number | Initialization command | Layer one is safeguarded | Pointer p | |
| 3 | Reserve bytes | Reserve bytes | Reserve bytes | Reserve bytes | Reserve bytes | |
| …… | …… | …… | …… | …… | …… | |
| 15 | Reserve bytes | Reserve bytes | Reserve bytes | Reserve | Reserve bytes | |
| 16 | Manufacturer's self defined area | Portld/Locat ionld | LoESCAM | | hop | |
| 17 | Manufacturer's self defined area | Manufacturer's self defined area | Manufacturer's self defined area | Manufacturer's self defined area | Manufacturer's self |
|
| 18 | Manufacturer's self defined area | Manufacturer's self defined area | Manufacturer's self defined area | Manufacturer's self defined area | Manufacturer's self defined area | |
| 19 | Manufacturer's self defined area | Manufacturer's self defined area | Manufacturer's self defined area | Manufacturer's self defined area | Manufacturer's self defined area | |
| …… | …… | …… | …… | …… | …… | |
| p-1 | Manufacturer's self defined area | Reserved of VS | Reserved of VS | Reserved of VS | Reserved of VS | |
| Pointer p | The quick control maintenance channel | The quick control maintenance channel | The quick control maintenance channel | The quick control maintenance channel | The quick control maintenance channel | |
| …… | …… | …… | …… | …… | …… | |
| 63 | The quick control maintenance channel | The quick control maintenance channel | The quick control maintenance channel | The quick control maintenance channel | The quick control maintenance channel |
Table 1
Below further disclosed the correlation circumstance of the control data in agreement framework, frame definition form and the CPRI superframe of CPRI interface, about specifying of CPRI standard, can further organize disclosed normative document " CPRI Specification V2.0 " referring to CPRI, Chinese can be translated into " common public radio interface standard 2.O version ".
In the system of serially concatenated mode networking, in order to realize concurrent communication mechanism between REC and the RE, the serially concatenated bus at first will solve the problem of communication contention aware and Flow Control between every grade of RE, and the transmission means that adopts usually has following two kinds at present:
First kind of mode is that timeslice is isolated.Specifically, different slave units is distributed different timeslices, different equipment only can send data in one's own timeslice, so just can solve the problem of concurrent communication, but in this scheme, fixedly take the timeslice of appointment by different slave units, even current slave unit does not have data to send out, other equipment can not take, thereby greatly reduces bandwidth availability ratio.
The second way is that buffer memory is transmitted.RE carries out buffer memory to the control data that control data and CPU from the RE of subordinate come, and carries out unified scheduling, transmits to higher level RE.The method requires remote radio unit (RRU) (the Remote Radio Unit of every grade of RE, abbreviation " RRU ") carries out accurate flow control, yet because might there be abnormality processing in each grade RE in the process of transmission, or phenomenon such as bursts of traffic, can't realize accurately control at each grade RE, thereby in the process of data upload, because the stack of flow, the situation of flow greater than total band width in physical will appear in the RE of upper level, cause packet loss.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of serial tandem connection bus up flow control method and node device, makes when the node number changes on the serially concatenated bus, can adjust the bandwidth of node adaptively.
For achieving the above object, the invention provides a kind of serial tandem connection bus up flow control method, comprise following steps:
Each node is determined the primary bandwidth of this node according to the total bandwidth of serially concatenated bus and the node sum of cascade, and according to each downstream site of position calculation of this node and the primary bandwidth sum of this node, obtains the transmission upper limit of this node;
Data from downstream site are carried out buffer memory, being less than or equaling the bandwidth that this node sends the upper limit, the outgoing data of institute's data in buffer and this node is sent to superior node.
Wherein, each node determines that according to its primary bandwidth this node can send the data volume of outgoing data.
In this external described method, each node deducts the data volume from downstream site of current cache according to the transmission upper limit of this node, determines that this node can send the data volume of outgoing data.
In this external described method, deposit data from downstream site by first buffer memory, second buffer memory is deposited the outgoing data of described node;
Described node determined the scheduling duration of described first buffer memory to send described data from downstream site in this scheduling duration according to its downstream site primary bandwidth sum;
Described node determined the scheduling duration of described second buffer memory according to described primary bandwidth, sends the outgoing data of this node in this scheduling duration.
In this external described method, the primary bandwidth of nodes at different levels is obtained divided by described node sum by the total bandwidth of described serially concatenated bus.
In this external described method, described serially concatenated bus is general common radio-frequency equipment interface.
The present invention also provides a kind of node device of serially concatenated, comprises:
Computing module is used for determining the primary bandwidth of this node according to the total bandwidth of serially concatenated bus and the node sum of cascade, and according to each downstream site of position calculation of this node and the primary bandwidth sum of this node, obtains the transmission upper limit of this node;
Cache module is used for the data from downstream site are carried out buffer memory;
Sending module is used for being less than or equaling the bandwidth of the transmission upper limit that described computing module calculates, and the outgoing data of described cache module institute's data in buffer and this node is sent to superior node.
Wherein, described sending module also be used for according to described computing module calculate primary bandwidth, determine to send the data volume of outgoing data.
In addition, described sending module also be used for according to described computing module calculate the transmission upper limit deduct described cache module data in buffer amount, determine to send the data volume of this node outgoing data.
In addition, described computing module is by obtaining the total bandwidth of described serially concatenated bus the primary bandwidth of described node device divided by described node sum.
By relatively finding, the main distinction of technical scheme of the present invention and prior art is, each node is according to the total bandwidth of serially concatenated bus and the total primary bandwidth of determining this node of node of cascade, and, obtain the transmission upper limit of this node according to each downstream site of position calculation of this node and the primary bandwidth sum of this node.Determine to send the upper limit by this mode, when the node number reduces on the serially concatenated bus, it is big that the primary bandwidth of each node will become, thereby the transmission upper limit of nodes at different levels will rise thereupon, make when the node of cascade tails off, nodes at different levels can be assigned with more transmission bandwidth, improve bandwidth utilization.Equally, according to this mode, when the node of cascade increases, the primary bandwidth of each node and the transmission upper limit also can descend thereupon, guarantee that each node all can be assigned to corresponding bandwidth, normally upload its data, thereby when the node number changes on the serially concatenated bus, can adjust the bandwidth of node adaptively.
The node of each cascade carries out buffer memory to the data from downstream site, to be less than or to equal the bandwidth that this node sends the upper limit, institute's data in buffer and node at the corresponding levels is waited that the data of sending out send to superior node.By the data from downstream site are carried out buffer memory, make that uploading data at downstream site emergency situations occurs, when the data volume of uploading increases suddenly, also can upload data to be less than or to equal the bandwidth that this node sends the upper limit, effectively avoid overflowing, guarantee data transmission quality because of data volume increases the data that cause.
Each node determines that according to its primary bandwidth this node can send the data volume of outgoing data, implements comparatively simple and can stablize the data volume that each node of control is uploaded.
Each node is according to the transmission upper limit of this node and the data volume from downstream site of current cache, determine the data volume of the outgoing data that this node can send, making needs data quantity transmitted more after a little while at downstream site, superior node can utilize its unnecessary bandwidth for transmission data, when not influencing other node transmission data, further improved bandwidth availability ratio.
The primary bandwidth of nodes at different levels is obtained divided by the node sum by the total bandwidth of serially concatenated bus, guarantees that each node of cascade can fair transmission data.
Description of drawings
Fig. 1 is the connection diagram of serially concatenated bus in the prior art;
Fig. 2 is the logical model schematic diagram of CPRI interface in the prior art;
Fig. 3 is a CPRI interface protocol framework schematic diagram in the prior art;
Fig. 4 is the form schematic diagram of CPRI superframe definition in the prior art;
Fig. 5 is a control data definition schematic diagram in the CPRI superframe in the prior art;
Fig. 6 is a control data distribution map after the serialization in the prior art;
Fig. 7 is the algorithm schematic diagram that distributes automatically based on Hop in the prior art;
Fig. 8 is the structural representation according to the node of serially concatenated in the universal serial bus upstream control method of first embodiment of the invention;
Fig. 9 is the universal serial bus upstream control method flow chart according to first embodiment of the invention;
Figure 10 is the universal serial bus upstream control method flow chart according to second embodiment of the invention;
Figure 11 is the system construction drawing according to the serially concatenated node device of third embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
Core of the present invention is, each serial node is according to the total bandwidth of serially concatenated bus and the total primary bandwidth of determining this node of node of cascade, and, obtain the transmission upper limit of this node according to each downstream site of position calculation of this node and the primary bandwidth sum of this node.The primary bandwidth of each node changes with the different of node number of the transmission upper limit according to cascade, when the node number reduces on the serially concatenated bus, the primary bandwidth of nodes at different levels and the transmission upper limit will rise, when the node of cascade increases, the primary bandwidth of each node and the transmission upper limit also can descend thereupon, thereby when the node number changes on the serially concatenated bus, can adjust the bandwidth of node adaptively.Each node carries out buffer memory to the data from downstream site, being less than or equaling the bandwidth that this node sends the upper limit, the outgoing data of institute's data in buffer and this node is sent to superior node.
According to inventive principle the first embodiment of the invention serial tandem connection bus up flow control method is described below.In the present embodiment, the serially concatenated bus is the CPRI interface, and the structural representation of the node of serially concatenated as shown in Figure 8.
Concrete flow control method as shown in Figure 9, in step 901, the node of serially concatenated at first obtains the total bandwidth of serially concatenated bus, the node sum (Hoptotal) of cascade and the progression (Hop) of this node, according to the total bandwidth of serially concatenated bus and the total primary bandwidth of determining this node of node of cascade, and calculate the primary bandwidth sum of each downstream site and this node according to the progression of this node, obtain the transmission upper limit of this node.
Specifically, the primary bandwidth of nodes at different levels is obtained divided by the node sum by the total bandwidth of serially concatenated bus, and the primary bandwidth sum of each downstream site and this node is the transmission upper limit of this node.This transmission upper limit can be divided into two parts: the reception upper limit of this node, i.e. and the primary bandwidth sum of downstream site, and this node can send the data volume upper limit of outgoing data, the i.e. primary bandwidth of this node.According to the CPRI standard, quick control maintenance channel (link configuration that is used for Ethernet) total bandwidth is 84.48Mbps to the maximum, if according to prior art, adopt fixed-bandwidth Flow Control mode, the fixing bandwidth during with 8 grades of cascades of the primary bandwidth of tandem node is a standard, and then average every grade of node primary bandwidth can not surpass 10.56Mbps.Equally, control the maintenance channel total bandwidth at a slow speed and be 1.92Mbps to the maximum, can not surpass 240kpbs according to the primary bandwidth of the average every grade of node of prior art.Because under the actual networking situation, the ratio of 8 grades of tandem node is few especially, when the node of cascade does not reach 8 grades, will waste the communication bandwidth resource to a great extent.Yet in the present embodiment, the primary bandwidth of each node is to be obtained by the total bandwidth of the cascade bus total node number divided by cascade, as seen at the node of cascade less than 8 o'clock, each tandem node will be assigned with more primary bandwidth, the transmission upper limit of each node also promotes thereupon, thereby can utilize bandwidth resources more fully.
For example, if the serially concatenated bus adopts Ethernet, its total bandwidth is 84.48Mbps, the node of cascade adds up to 4 on the serially concatenated bus, the progression of present node is 3, then the primary bandwidth of each node is 21.12Mbps, is limited to the primary bandwidth sum of two nodes of subordinate and this node in the transmission of this node, i.e. 63.36Mbps.Compared to existing technology, the primary bandwidth of this node and the transmission upper limit improve greatly.
Enter step 902, when the node of serially concatenated is received data from downstream site, with the deposit data received in first buffer memory.The outgoing data of this node self leaves in second buffer memory.By the data from downstream site are carried out buffer memory, make and emergency situations when downstream site is uploaded data, occurs, when the data volume of uploading increases suddenly, can not cause this node data spillover (be data that this node is uploaded exceed send the upper limit cause send the bandwidth deficiency), this node can be temporarily stored in the data that have more in the buffer memory, waits for transmission next time.
Then enter step 903, this node to be being less than or equaling the bandwidth that this node sends the upper limit, with in first buffer memory in the data of downstream site and second buffer memory outgoing data of this node send to superior node.Wherein, the data from downstream site that sent are less than or equal downstream site primary bandwidth sum, and this node outgoing data that is sent is less than or equals the primary bandwidth of this node.When specific implementation, this node can be controlled the data traffic that first buffer memory sends downstream site by this scheduling duration with the scheduling duration of determining first buffer memory according to its downstream site primary bandwidth sum; And determine the scheduling duration of second buffer memory according to this node primary bandwidth, control the flow that second buffer memory sends the outgoing data of this node by this scheduling duration.At above-mentioned case, this node is according to the primary bandwidth sum of its following two downstream sites, and the scheduling duration of determining first buffer memory is 2 clock cycle, continues to send the downstream site data of institute's buffer memory in 2 clock cycle; Equally, this node determines that according to its primary bandwidth the scheduling duration of second buffer memory is 1 clock cycle, continues to send the outgoing data of this node in 1 clock cycle, realizes the control of upstream data transmitted traffic by determining the scheduling duration.
First buffer memory and second buffer memory alleged among the present invention are logical concept, and first buffer memory and second buffer memory can be in same physical cache, also can be in different physical cache.Each buffer memory itself also may be realized by the combination of a plurality of physics storaging chips.
Below the second embodiment of the invention serial tandem connection bus up flow control method is described.
As shown in figure 10, in step 1001, the node of serially concatenated at first obtains the total bandwidth of serially concatenated bus, the node sum (hoptotal) of cascade and the progression (hop) of this node, and according to the total bandwidth of serially concatenated bus and the total primary bandwidth of determining this node of node of cascade, and calculate the primary bandwidth sum of each downstream site and this node according to the progression of this node, obtain the transmission upper limit of this node.Wherein, the primary bandwidth of nodes at different levels is obtained divided by the node sum by the total bandwidth of serially concatenated bus, and the primary bandwidth sum of each downstream site and this node is the transmission upper limit of this node.
Then enter step 1002, when the node of serially concatenated is received data from downstream site, with the deposit data received in first buffer memory.The outgoing data of this node self leaves in second buffer memory.By the data from downstream site are carried out buffer memory, make and emergency situations when downstream site is uploaded data, occurs, when the data volume of uploading increases suddenly, can not cause this node data spillover (be data that this node is uploaded exceed send the upper limit cause send the bandwidth deficiency), this node can be temporarily stored in the data that have more in the buffer memory, waits for transmission next time.
Then enter step 1003, this node determines that according to the transmission upper limit of this node and the data volume from downstream site of current cache this node can send the data volume upper limit of outgoing data.Specifically, the transmission upper limit of this node data volume that deducts downstream site is the data volume upper limit that this node can send outgoing data.By this method, need data quantity transmitted more after a little while at downstream site, superior node can utilize its unnecessary bandwidth for transmission data, when not influencing other node transmission data, has further improved bandwidth availability ratio.
Then enter step 1004, this node sends the data of downstream site according to downstream site primary bandwidth sum, and sends the outgoing data of this node according to the data volume upper limit of being calculated.
Node device to the third embodiment of the invention serially concatenated describes below.
As shown in figure 11, the node device of serially concatenated comprises computing module, cache module and sending module.Computing module is used for determining according to the node sum of the total bandwidth of serially concatenated bus and cascade the primary bandwidth of this node, the total bandwidth that is about to the serially concatenated bus obtains the primary bandwidth of this node device divided by the node sum, and, obtain the transmission upper limit of this node according to each downstream site of position calculation of this node and the primary bandwidth sum of this node.Determine to send the upper limit by computing module, when the node number reduces on the serially concatenated bus, it is big that the primary bandwidth of each node will become, thereby the transmission upper limit of nodes at different levels will rise thereupon, make when the node of cascade tails off, nodes at different levels can be assigned with more transmission bandwidth, improve bandwidth utilization.Equally, when the node of cascade increased, the primary bandwidth of each node and the transmission upper limit also can descend thereupon, guarantee that each node all can be assigned to corresponding bandwidth, normally upload its data, thereby when the node number changes on the serially concatenated bus, can adjust the bandwidth of node adaptively.Cache module is used for the data from downstream site are carried out buffer memory, makes that uploading data at downstream site emergency situations occurs, when the data volume of uploading increases suddenly, can not overflow because of data volume increases the data that cause, and guarantees data transmission quality.Sending module is used for being less than or equaling the bandwidth of the transmission upper limit that computing module calculates, and the outgoing data of cache module institute data in buffer and this node is sent to superior node.Wherein, the data volume of this node outgoing data that sending module can send can by computing module calculate primary bandwidth determine, or by computing module calculate the transmission upper limit and the difference of the data volume of cache module buffer memory downstream site determine.
Though pass through with reference to some of the preferred embodiment of the invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (10)
1. a serial tandem connection bus up flow control method is characterized in that, comprises following steps:
Each node is determined the primary bandwidth of this node according to the total bandwidth of serially concatenated bus and the node sum of cascade, and according to each downstream site of position calculation of this node and the primary bandwidth sum of this node, obtains the transmission upper limit of this node;
Data from downstream site are carried out buffer memory, being less than or equaling the bandwidth that this node sends the upper limit, the outgoing data of institute's data in buffer and this node is sent to superior node.
2. serial tandem connection bus up flow control method according to claim 1 is characterized in that, each node determines that according to its primary bandwidth this node can send the data volume of outgoing data.
3. serial tandem connection bus up flow control method according to claim 1 is characterized in that, each node deducts the data volume from downstream site of current cache according to the transmission upper limit of this node, determines that this node can send the data volume of outgoing data.
4. serial tandem connection bus up flow control method according to claim 2 is characterized in that, deposits data from downstream site by first buffer memory, and second buffer memory is deposited the outgoing data of described node;
Described node determined the scheduling duration of described first buffer memory to send described data from downstream site in this scheduling duration according to its downstream site primary bandwidth sum;
Described node determined the scheduling duration of described second buffer memory according to described primary bandwidth, sends the outgoing data of this node in this scheduling duration.
5. according to each described serial tandem connection bus up flow control method in the claim 1 to 4, it is characterized in that the primary bandwidth of nodes at different levels is obtained divided by described node sum by the total bandwidth of described serially concatenated bus.
6. according to each described serial tandem connection bus up flow control method in the claim 1 to 4, it is characterized in that described serially concatenated bus is general common radio-frequency equipment interface.
7. the node device of a serially concatenated is characterized in that, comprises:
Computing module is used for determining the primary bandwidth of this node according to the total bandwidth of serially concatenated bus and the node sum of cascade, and according to each downstream site of position calculation of this node and the primary bandwidth sum of this node, obtains the transmission upper limit of this node;
Cache module is used for the data from downstream site are carried out buffer memory;
Sending module is used for being less than or equaling the bandwidth of the transmission upper limit that described computing module calculates, and the outgoing data of described cache module institute's data in buffer and this node is sent to superior node.
8. the node device of serially concatenated according to claim 7 is characterized in that, described sending module also be used for according to described computing module calculate primary bandwidth, determine to send the data volume of outgoing data.
9. the node device of serially concatenated according to claim 8, it is characterized in that, described sending module also be used for according to described computing module calculate the transmission upper limit deduct described cache module data in buffer amount, determine to send the data volume of this node outgoing data.
10. according to the node device of each described serially concatenated in the claim 7 to 9, it is characterized in that described computing module is by obtaining the total bandwidth of described serially concatenated bus the primary bandwidth of described node device divided by described node sum.
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