CN102647333B - Communication means under distributed base station system between baseband processing equipment and device - Google Patents
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Abstract
The invention provides the communication means under distributed base station system between baseband processing equipment and device.Wherein, the method comprises: when each intermediate equipment be between source BBU and object BBU receives the data flow that source BBU sends, the mark of the object BBU carried according to described data flow determines sending the down hop of described data flow, if the quantity N of the down hop determined is greater than 1, the characteristic parameter of described data flow is then utilized from the N number of down hop determined, to select one for sending the down hop of described data flow, described data flow is sent by the down hop of this selection, if N equals 1, then the direct down hop determined by this sends described data flow.Adopt the present invention, the communication between baseband processing equipment under distributed base station system can be realized.
Description
Technical field
The present invention relates to the network communications technology, the communication means particularly under distributed base station system between baseband processing equipment (BBU:BaseBandUnit) and device.
Background technology
The key concept of distributed base station system is exactly that baseband processing equipment is separated with apparatus for radio frequency processing (RRU:RemoteRadioUnit), by both Fiber connection, and distributed base station system structure chart that specifically can be shown in Figure 1.In the distributed base station system shown in Fig. 1, BBU and core net, wireless network control apparatus concentrate in machine room, be connected, complete the network coverage by optical fiber with RRU.
Wherein, the Fiber connection between BBU and RRU observes standard interface protocol, and this standard interface protocol supports star-like connection, chain connects and annular such as to be connected at the network topology structure, to make BBU+RRU more can networking neatly.
Compared with the networking mode of conventional macro base station, distributed base station system can provide easy mounting means and the more effective network coverage flexibly.But in distributed base station system, BBU completes base band signal process in inside, in other words, without any coordination, mutual between BBU, this just causes the problem that traffic is unbalanced, the BBU utilization of resources is insufficient.The unbalanced schematic diagram of traffic is shown see Fig. 2, Fig. 2.In fig. 2, there are two BBU, i.e. BBU-A and BBU-B, wherein, BBU-A connects RRU-A, and this RRU-A is mainly distributed in resident residential area, and BBU-B connects RRU-B, and this RRU-B is mainly distributed in shopping centre.At 9 in the morning being distributed in sowntown RRU-B and BBU-B operationally section such as Mon-Fri can be busier to 6 pm, then more idle in the inoperative period; RRU-A and BBU-A being distributed in residential area is then just in time contrary, and operationally section can be more idle, can be busier in the inoperative period.Like this, may there is the phenomenon that load is excessive in BBU-B operationally section, and in inoperative period process resource again less than supplementary utilization; Similarly, may there is in the inoperative period phenomenon that load is excessive in BBU-A, and operationally section process resource can not get supplementing utilization.
In summary it can be seen, in order to realize equalizing traffic volume, make full use of BBU resource, the communication means under distributed base station system between BBU is current technical problem urgently to be resolved hurrily.But, still there is no the communication that a kind of method realizes under distributed base station system between BBU in prior art.
Summary of the invention
The invention provides the communication means under distributed base station system between baseband processing equipment and device, to realize the communication under distributed base station system between baseband processing equipment.
Technical scheme provided by the invention comprises:
Communication means under a kind of distributed base station system between baseband processing equipment, the method is applied to and comprises in the topological structure of Multilayer Switching, in described topological structure, connected by multiple intermediate equipment between source BBU and object BBU, further, the route of existence at least one for communicating between described source BBU and object BBU; The method comprises:
When each intermediate equipment be between source BBU and object BBU receives the data flow that source BBU sends, the mark of the object BBU carried according to described data flow determines sending the down hop of described data flow, if the quantity N of the down hop determined is greater than 1, the characteristic parameter of described data flow is then utilized from the N number of down hop determined, to select one for sending the down hop of described data flow, described data flow is sent by the down hop of this selection, if N equals 1, then the direct down hop determined by this sends described data flow.
A kind ofly be applied to the device communicated between baseband processing equipment under distributed base station system, this application of installation is in the topological structure comprising Multilayer Switching, in described topological structure, connected by multiple described device between source BBU and object BBU, and, the route of existence at least one for communicating between described source BBU and object BBU, described device comprises:
Receiving element, for receiving the data flow that source BBU sends,
Down hop determining unit, the mark for the object BBU carried according to described data flow determines the down hop sending described data flow;
Transmitting element, for when the quantity N of the down hop determined is greater than 1, the characteristic parameter of described data flow is utilized from the N number of down hop determined, to select one for sending the down hop of described data flow, described data flow is sent by the down hop of this selection, when N equals 1, the down hop directly determined by this sends described data flow.
As can be seen from the above technical solutions, in the present invention, source BBU transmits data flow by multiple intermediate equipment to object BBU, achieves the communication between source BBU and object BBU;
Further, in the present invention, when each intermediate equipment is greater than 1 at the quantity N of the down hop that the mark of the object BBU carried according to described data flow is determined for sending described data flow, the characteristic parameter of described data flow is utilized from the N number of down hop determined, to select one for sending the down hop of described data flow, described data flow is sent by the down hop of this selection, this achieve the communication between source BBU and object BBU, the different data streams this achieving source BBU transmission can arrive object BBU by different routes, reach routing overhead equilibrium.
Accompanying drawing explanation
Fig. 1 is distributed base station system structure chart;
Fig. 2 is the unbalanced schematic diagram of live traffic;
The concrete schematic diagram of topological structure that Fig. 3 applies for the flow process that the embodiment of the present invention provides;
The basic flow sheet that Fig. 4 provides for the embodiment of the present invention;
The interaction diagrams of the resource reservation request message that Fig. 5 provides for the embodiment of the present invention and response message;
The specific embodiment schematic diagram that Fig. 6 provides for the embodiment of the present invention;
The structure drawing of device that Fig. 7 provides for the embodiment of the present invention.
Embodiment
In order to make the object, technical solutions and advantages of the present invention clearly, describe the present invention below in conjunction with the drawings and specific embodiments.
Embodiments provide the communication means between BBU under distributed base station system, it should be noted that, BBU in the embodiment of the present invention can be called a computing unit, it can the process of complete independently baseband signal, according to different situation, it can think a BBU entity or a LTE Baseband Processing Unit entity, and the embodiment of the present invention does not specifically limit.
The method that the embodiment of the present invention provides is applied to the topological structure comprising Multilayer Switching, in described topological structure, is connected between source BBU and object BBU by multiple intermediate equipment, and wherein, this intermediate equipment is specially switching equipment.Further, the quantity of the route required for communicating between any two BBU of topological structure requirement in the embodiment of the present invention is more than or equal to 1.
Preferably, can be the topological structure of fat tree (FatTree) during described topological structure specific implementation.Fig. 3 shows the topological structure schematic diagram of fat tree.Topological structure shown in Fig. 3 for providing lasting bandwidth between switching layer, and constitutes a clog-free and extendible switching system.This topological structure specifically can be divided into following three layers shown in Fig. 3: boundary layer, convergence-level and core layer.In figure 3, boundary layer contains multiple BBU, and convergence-level and core layer contain intermediate equipment between BBU (this intermediate equipment is specially the switching equipment shown in Fig. 3, below be all switching equipment with intermediate equipment for example is described).As can be seen from Figure 3, multiple switching equipment is there is between any two BBU in convergence-level, by introducing multiple stage switching equipment, large-scale BBU can be provided interconnected, and, the present invention does not require that switching equipment has higher backboard exchange capacity, i.e. less demanding to switching equipment of the present invention yet, and it is interconnected that this can realize the extensive BBU of low cost.In actual applications, the switching equipment of fat tree topology structural requirement different layers has identical characteristic, and such as port number is equal, so, supposes that the port number of the switching equipment shown in Fig. 3 is total up to k, so needs 5K under this fat tree topology structure
2/ 4 switching equipment support k
3/ 4 BBU.
It should be noted that, before performing and communicating between the BBU under the distributed base station system that provides of the embodiment of the present invention, need first to perform the route learning flow process that the embodiment of the present invention provides.This route learning flow process is mainly carried out according to ospf protocol, is specially: each switching equipment under fat tree topology structure learns route according to ospf protocol, and by study to route record in routing table.Learn route by ospf protocol, can meet the Routing Protocol requirement of shortest path, also, the communication carried out between any two BBU all can select the path of the shortest jumping figure.Based on the feature of the fat tree topology structure shown in Fig. 3, can make communicates between any two BBU all can exist the path of multiple same jumping figure, and the quantity of the optimum route required for also namely communicating between any two BBU is more than or equal to 1.
Based on describing above, below the communication means under distributed base station system between BBU is described:
See the flow chart that Fig. 4, Fig. 4 provide for the embodiment of the present invention.As shown in Figure 4, this flow process can comprise the following steps:
Step 401, when each switching equipment be between source BBU and object BBU receives the data flow that source BBU sends, performs step 402.
Step 402, the mark of the object BBU carried according to described data flow determines sending the down hop of described data flow, if the quantity N of the down hop determined is greater than 1, the characteristic parameter of described data flow is then utilized from the N number of down hop determined, to select one for sending the down hop of described data flow, described data flow is sent by the down hop of this selection, if N equals 1, then the direct down hop determined by this sends described data flow.
Determination in this step 402 is specially: the mark of the object BBU carried according to described data flow (mark of this object BBU can for the purpose of the address of BBU) searches the down hop for sending described data flow in the routing table.
In this step 402, utilizing the characteristic parameter of data flow from the N number of down hop determined, to select one for sending the down hop of described data flow, specifically can be:
Step 1, is divided into N number of region by valued space corresponding to the hash function of down hop that be used for selecting set, N number of region correspondence is distributed to N number of down hop, and also, a region and a down hop are one_to_one corresponding.
Step 2, adopts described hash function to carry out Hash operation to the characteristic parameter that described data flow is carried, obtains the first cryptographic Hash;
Step 3, determines the region residing for described first cryptographic Hash from N number of region, and down hop corresponding for the region residing for described first cryptographic Hash is defined as the down hop for sending described data flow.
In the above description, data flow carry characteristic parameter specific implementation time can be: the mark of data flow, the mark of source BBU and the mark of object BBU.
Wherein, the mark of data flow can be the numbering of data flow (id), and this numbering has uniqueness, and the mark of source BBU can be the address (src) of source BBU, the mark of object BBU can for the purpose of the address (dst) of BBU.For id, src and dst, the operation of above-mentioned steps 1 to step 3 is specifically described below:
If determine 3 down hops and down hop 1 to down hop 3 all for sending described data flow, then, valued space corresponding for the hash function of setting is divided into 3 regions, such as, the valued space size that the hash function of setting is corresponding is n bit, then this valued space is: 0 to 2
n, so, by this valued space 0 to 2
nbe divided into 3 regions, be respectively 1 to region, region 3; And three down hops are distributed in these three regions respectively, such as, region 1 is dispensed to down hop 1, and region 2 is dispensed to down hop 2, and region 3 is dispensed to down hop 3.
Afterwards, Hash operation is performed to src, dst, id, namely obtains the first cryptographic Hash k=hash (src, dst, id); By judging which region k drops on and select concrete next hop address.Such as, k drops on region 2, then select down hop 2 to send described data flow.
So far, the characteristic parameter that can realize utilizing data flow to carry selects one for sending the operation of the down hop of described data flow from the N number of down hop determined.
It should be noted that, above-mentionedly valued space corresponding for the hash function set is divided into N number of region can comprises: according to equally distributed principle, valued space corresponding for the hash function set evenly is divided into N number of region; Or for each down hop in N number of down hop configures a weighted value, valued space corresponding for the hash function set is divided into N number of region by the weighted value according to configuration;
Wherein, when valued space corresponding for the hash function set being divided into N number of region according to the weighted value of configuration, describedly N number of region correspondence is distributed to N number of down hop comprise: N number of region correspondence is distributed to N number of down hop by the weighted value according to down hop, also namely, by region allocation to the down hop of weighted value being configured this region institute foundation.
So far, the flow process shown in Fig. 4 is completed.Can be found out by the flow process shown in Fig. 4, source BBU fails to be convened for lack of a quorum by different routes arrival object BBU to the different pieces of information that object BBU sends, and this achieves routing overhead equilibrium.
Usually, in order to meet the real-time demand of base band signal process, do not provide data validation mechanism between BBU, so, once the resource requirement that on path, the resource of certain switching equipment such as bandwidth does not meet data flow causes loss of data, the reliability of end-to-end transmission can be reduced.Based on this, the embodiment of the present invention proposes reserved resource allocation method, namely requires each intermediate equipment between source BBU and object BBU in advance for data flow reserves the resource required for this data flow, to realize end to end transmitting in real time.Wherein, can be bandwidth during this resource specific implementation, or other are for the resource of transmitting data stream, specifically do not limit here.
Above-mentioned reserved resource allocation method occurs in source BBU and sends before data flow to object BBU, and it is based on end-to-end PSVP (RSVP).Wherein, RSVP is unidirectional protocol, and each protocol interaction flow process is only a data flow service, and different data streams needs to carry out resource reservation separately, in addition, this protocol encapsulation in Routing Protocol, the not route behavior of determination data stream.
Based on this, each switching equipment between source BBU and object BBU is that described data flow reserves resource by following steps:
Step a, described each switching equipment be between source BBU and object BBU receives source node when resource reservation request message (Req) that the forward direction object BBU sending described data flow sends, confirm the current requirement whether meeting the resource required for described data flow that described Req carries, if, the mark of the object BBU carried according to described Req determines the down hop sending Req, if the quantity M of the down hop determined is greater than 1, the characteristic parameter of the described data flow then utilizing described Req to carry, and from N number of down hop, selecting one from M the down hop determined, selecting one for sending the down hop of described Req for the operation sending the down hop of described data flow according to above-described, described Req is sent by the down hop of this selection, if M equals 1, then the direct down hop determined by this sends described Req, until arrive object BBU, if not, then upper hop sends resource reservation failure response message, the down hop sending described data flow to object BBU is upgraded when receiving resource reservation failure response message to make upper hop, and select new down hop to send described Req, until arrive object BBU,
Step b, described in each intermediate equipment be between source BBU and object BBU receive object BBU receive described Req after according to described Req via path receive message to the confirmation resource that source BBU sends time, reserved resource required for described data flow.
Wherein, confirm that resource reception message and resource reservation failure response message are all the response message of Req, only both corresponding different marks.
Preferably, for making above-mentioned steps a and step b clearly, the embodiment of the present invention shows the interaction flow of resource reservation request message and response message in step a and step b by Fig. 5.Wherein, the Resp (1) in Fig. 5 represents resource reservation failure response message, and Resp (0) represents that confirmation resource receives message.
In addition, in order to ensure object BBU according to described resource reservation request message via path to send to source BBU and confirm that resource receives message, the path of this resource reservation request message process on the way can be recorded in resource reservation request message.
It should be noted that, in the embodiment of the present invention, when the resource required for reserved described data flow, can comprise further: start the timer that described data flow is corresponding; If do not receive described data flow within the time that described timer allows, then cancel the resource reservation to described data flow.This can ensure making full use of of resource.
Also it should be noted that, in step a, upgrade the down hop sending described data flow to object BBU when upper hop receives resource reservation failure response message and comprise: the upper hop intermediate equipment arranged for sending described resource reservation failure response message is not the down hop for sending described data flow to object BBU.So, when the described data flow that this upper hop sends at subsequently received source BBU, and when determining the down hop sending this data flow, directly the intermediate equipment sending described resource reservation failure response message is foreclosed.Based on this, in step a, select new down hop to send resource reservation request message to comprise: select from the down hop for sending described resource reservation request message the down hop be not set up, if the quantity of this down hop be not set up is greater than 1, the characteristic parameter of the described data flow then utilizing described resource reservation request message to carry, and select one for sending the down hop of described resource reservation request message according to above-described selecting from N number of down hop in a down hop be never set up for the operation of the down hop sending described data flow, if the quantity of this down hop be not set up equals 1, then the direct down hop be not set up by this sends described resource reservation request message.This can ensure that the path of data flow is consistent with the path of resource reservation request message.
So far, each intermediate equipment completed between source BBU and object BBU is the operation that described data flow reserves resource.
The method provided the embodiment of the present invention has above carried out complete description.A specific embodiment is adopted to describe the present invention below.
See the specific embodiment schematic diagram that Fig. 6, Fig. 6 provide for the embodiment of the present invention.In figure 6, source BBU (src is 192.168.0.1) needs to send data flow 1 and data flow 2 to object BBU (dst is 192.168.2.3), then before this data flow 1 of transmission and data flow 2, source BBU first sends resource reservation request message (req) 1 and req2 to object BBU, wherein, req1 corresponding data stream 1, req2 corresponding data stream 2.
When two req arrive the arbitrary intermediate equipment between source BBU and object BBU, the resource requirement that this intermediate equipment judges self whether to meet req1, req2 carries, if satisfy the demands, the down hop for forwarding this request is found from routing table, as can be seen from routing table, there are two down hops and can send req1, req2 to object BBU, based on this, by the characteristic parameter such as (src carried in input req1, req2, dst, id) tlv triple to the hash function of setting carries out hash computing and obtains two different cryptographic Hash.Owing to there are 2 down hops, the valued space that this hash function is corresponding is divided into two parts, here easily find out that data flow id is different, so the down hop that two req are corresponding different, such as, req1 is routed to down hop from port0, and req1 is routed to down hop from port1, and then req1 and req2 progressively will be forwarded to object BBU;
If do not satisfy the demands, then upper hop sends resource reservation failure response message, upgrade the down hop sending described data flow to object BBU when receiving resource reservation failure response message to make upper hop, and select new down hop to send req1, req2, until arrive object BBU.
When object BBU receives req1, req2, it replys resp1 and resp2, when each intermediate equipment receives resp1, resp2, is the reserved resource of data flow 1,2.
When source BBU sends data flow 1, data flow 2 to object BBU, according to the flow process transmitting data stream 1 shown in Fig. 4, data flow 2.Because resource reservation request message and data flow are according to identical mode determination route, therefore, it is possible to ensure that data flow is according to reserved resource transmission, this guarantees data flow can in order without congested arrival object BBU by existing Routing Protocol.
So far, the method flow that completing the embodiment of the present invention provides describes.
Below the device that the embodiment of the present invention provides is described:
See the structure drawing of device that Fig. 7, Fig. 7 provide for the embodiment of the present invention.This application of installation is in the topological structure of topological structure such as fat tree comprising Multilayer Switching, in described topological structure, connected by multiple described device between source BBU and object BBU, and, the route of existence at least one for communicating between described source BBU and object BBU, described device specifically can be the switching equipment between source BBU and object BBU, and as shown in Figure 7, this device comprises:
Receiving element, for receiving the data flow that source BBU sends,
Down hop determining unit, the mark for the object BBU carried according to described data flow determines the down hop sending described data flow;
Transmitting element, for when the quantity N of the down hop determined is greater than 1, the characteristic parameter of described data flow is utilized from the N number of down hop determined, to select one for sending the down hop of described data flow, described data flow is sent by the down hop of this selection, when N equals 1, the down hop directly determined by this sends described data flow.
Preferably, as shown in Figure 7, described device comprises further:
Resource reservation unit, for reserving resource for described data flow; Based on this, described transmitting element by determine or the down hop selected utilize and reserved send described data flow for the resource sending described data flow.Wherein, described resource at least comprises bandwidth.
Wherein, described resource reservation unit is that described data flow reserves resource by following subelement:
First receives subelement, for receiving the resource reservation request message that source node sends at the forward direction object BBU sending described data flow;
Confirm subelement, for confirming the current resource requirement whether meeting the described data flow that described resource reservation request message carries of described device;
Route subelement, for when the confirmation result of described confirmation subelement is for being, the mark of the object BBU carried according to described resource reservation request message determines the down hop sending resource reservation request message, if the quantity M of the down hop determined is greater than 1, the characteristic parameter of the described data flow then utilizing described resource reservation request message to carry, and from M the down hop determined, select one for sending the down hop of described resource reservation request message according to selecting one from N number of down hop for the operation sending the down hop of described data flow, described resource reservation request message is sent by the down hop of this selection, if M equals 1, then the direct down hop determined by this sends described resource reservation request message, until arrive object BBU,
Response subelement, for when the confirmation result of described confirmation subelement is no, upper hop sends resource reservation failure response message, the down hop sending described data flow to object BBU is upgraded when receiving resource reservation failure response message to make upper hop, and select new down hop to send described resource reservation request message, until arrive object BBU;
Reserved subelement, for receive object BBU receive described resource reservation request message after according to described resource reservation request message via path receive message to the confirmation resource that source BBU sends time, reserve the resource required for described data flow;
Second receives subelement, the resource reservation failure response message that the down hop for receiving described data flow sends, and upgrades the down hop sending described data flow to object BBU, and selects new down hop to send described resource reservation request message.
In the present embodiment, described reserved subelement is when the resource required for reserved described data flow, the timer that the described data flow of further startup is corresponding, if do not receive described data flow within the time that described timer allows, then cancels the resource reservation to described data flow.
In the embodiment of the present invention, the down hop that the second reception subelement renewal sends described data flow to object BBU comprises: the intermediate equipment arranged for sending described resource reservation failure response message is not the down hop for sending described data flow to object BBU;
The new down hop of described selection sends resource reservation request message and comprises: select from the down hop for sending described resource reservation request message the down hop be not set up, if the quantity of this down hop be not set up is greater than 1, the characteristic parameter of the described data flow then utilizing described resource reservation request message to carry, and select one for sending the down hop of described resource reservation request message according to selecting from N number of down hop in a down hop be never set up for the operation of the down hop sending described data flow, if the quantity of this down hop be not set up equals 1, then the direct down hop be not set up by this sends described resource reservation request message.
In the present embodiment, described transmitting element selects one for sending the down hop of described data flow by following subelement from the N number of down hop determined:
Distribute subelement, for valued space corresponding to the hash function of down hop that be used for selecting set is divided into N number of region, N number of region correspondence is distributed to N number of down hop.Preferably, describedly valued space corresponding for the hash function set is divided into N number of region comprises: according to equally distributed principle, valued space corresponding for the hash function set evenly is divided into N number of region; Or for each down hop in N number of down hop configures a weighted value, valued space corresponding for the hash function set is divided into N number of region by the weighted value according to configuration.Wherein, when valued space corresponding for the hash function set being divided into N number of region according to the weighted value of configuration, describedly N number of region correspondence being distributed to N number of down hop comprising: N number of region correspondence is distributed to N number of down hop by the weighted value according to down hop.
Operator unit, for adopting described hash function to carry out Hash operation to the characteristic parameter that described data flow is carried, obtains the first cryptographic Hash.Preferably, the characteristic parameter that described data flow is carried at least comprises: the mark of described data flow, the mark of described source BBU and the mark of described object BBU.
Determining subelement, for determining the region residing for described first cryptographic Hash from N number of region, down hop corresponding for the region residing for described first cryptographic Hash being defined as the down hop for sending described data flow.
Above the device that the embodiment of the present invention provides is described.
As can be seen from the above technical solutions, in the present invention, source BBU transmits data flow by multiple intermediate equipment to object BBU, achieves the communication between source BBU and object BBU;
Further, in the present invention, when each intermediate equipment is greater than 1 at the quantity N of the down hop that the mark of the object BBU carried according to described data flow is determined for sending described data flow, the characteristic parameter of described data flow is utilized from the N number of down hop determined, to select one for sending the down hop of described data flow, described data flow is sent by the down hop of this selection, this achieve the communication between source BBU and object BBU, the different data streams this achieving source BBU transmission can arrive object BBU by different routes, reach routing overhead equilibrium.
Further, the present invention, by the method for reserved resource, can ensure this data flow in order without congested arrival object BBU, and raising source BBU and object BBU carry out the reliability communicated.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (16)
1. the communication means under a distributed base station system between baseband processing equipment (BBU), it is characterized in that, the method is applied to and comprises in the topological structure of Multilayer Switching, in described topological structure, connected by multiple intermediate equipment between source BBU and object BBU, further, the route of existence at least one for communicating between described source BBU and object BBU, described method comprises:
When each intermediate equipment receives the data flow of source BBU transmission, the mark of the object BBU carried according to described data flow determines sending the down hop of described data flow, if the quantity N of the down hop determined is greater than 1, the characteristic parameter of described data flow is then utilized from the N number of down hop determined, to select one for sending the down hop of described data flow, described data flow is sent by the down hop of this selection, if N equals 1, then the direct down hop determined by this sends described data flow.
2. method according to claim 1, is characterized in that, each intermediate equipment described, before receiving data flow, comprises further: for described data flow reserves the resource of these data flow needs, described resource at least comprises bandwidth;
Send described data flow by down hop to comprise: utilize reserved send described data flow for the resource sending described data flow by down hop.
3. method according to claim 2, is characterized in that, each intermediate equipment described is that described data flow reserves resource by following steps:
Each intermediate equipment described receives source node when the resource reservation request message that the forward direction object BBU sending described data flow sends, be confirmed whether to meet the resource requirement required for described data flow that described resource reservation request message carries, if, the mark of the object BBU carried according to described resource reservation request message determines the down hop sending resource reservation request message, if the quantity M of the down hop determined is greater than 1, the characteristic parameter of the described data flow then utilizing described resource reservation request message to carry, and from M the down hop determined, select one for sending the down hop of described resource reservation request message according to selecting one from N number of down hop for the operation sending the down hop of described data flow, described resource reservation request message is sent by the down hop of this selection, if M equals 1, then the direct down hop determined by this sends described resource reservation request message, until arrive object BBU, if not, then upper hop sends resource reservation failure response message, upgrade the down hop sending described data flow to object BBU when receiving resource reservation failure response message to make upper hop, and select new down hop to send described resource reservation request message, until arrive object BBU,
Each intermediate equipment described receive object BBU receive described resource reservation request message after according to described resource reservation request message via the confirmation resource that sends to source BBU of path receive message time, reserved resource required for described data flow.
4. method according to claim 3, it is characterized in that, upgrade the down hop sending described data flow to object BBU when upper hop receives resource reservation failure response message and comprise: the upper hop intermediate equipment arranged for sending described resource reservation failure response message is not the down hop for sending described data flow to object BBU;
The new down hop of described selection sends resource reservation request message and comprises: select from the down hop for sending described resource reservation request message the down hop be not set up, if the quantity of this down hop be not set up is greater than 1, the characteristic parameter of the described data flow then utilizing described resource reservation request message to carry, and select one for sending the down hop of described resource reservation request message according to selecting from N number of down hop in a down hop be never set up for the operation of the down hop sending described data flow, if the quantity of this down hop be not set up equals 1, then the direct down hop be not set up by this sends described resource reservation request message.
5. method according to claim 3, is characterized in that, when the resource required for reserved described data flow, the method comprises further:
Start the timer that described data flow is corresponding;
If do not receive described data flow within the time that described timer allows, then cancel the resource reservation to described data flow.
6., according to the arbitrary described method of claim 1 to 5, it is characterized in that, the described characteristic parameter utilizing data flow to carry is selected one and is comprised for the down hop sending described data flow from the N number of down hop determined:
Valued space corresponding to the hash function of down hop that be used for selecting set is divided into N number of region, N number of region correspondence is distributed to N number of down hop;
Adopt described hash function to carry out Hash operation to the characteristic parameter that described data flow is carried, obtain the first cryptographic Hash;
From N number of region, determining the region residing for described first cryptographic Hash, down hop corresponding for the region residing for described first cryptographic Hash being defined as the down hop for sending described data flow.
7. method according to claim 6, is characterized in that, the characteristic parameter that described data flow is carried at least comprises: the mark of described data flow, the mark of described source BBU and the mark of described object BBU.
8. method according to claim 6, is characterized in that, valued space corresponding for the hash function set is divided into N number of region and comprises: according to equally distributed principle, valued space corresponding for the hash function set evenly is divided into N number of region; Or for each down hop in N number of down hop configures a weighted value, valued space corresponding for the hash function set is divided into N number of region by the weighted value according to configuration;
Wherein, when valued space corresponding for the hash function set being divided into N number of region according to the weighted value of configuration, describedly N number of region correspondence being distributed to N number of down hop comprising: N number of region correspondence is distributed to N number of down hop by the weighted value according to down hop.
9. method according to claim 1, is characterized in that, the topological structure of described Multilayer Switching is the topological structure of fat tree.
10. method according to claim 1, is characterized in that, the route that described source BBU and described object BBU carry out communicating utilizes ospf protocol to learn by each intermediate equipment.
11. 1 kinds of devices being applied to communication between baseband processing equipment (BBU) under distributed base station system, it is characterized in that, this application of installation is in the topological structure comprising Multilayer Switching, in described topological structure, connected by multiple described device between source BBU and object BBU, further, the route of existence at least one for communicating between described source BBU and object BBU, described device comprises:
Receiving element, for receiving the data flow that source BBU sends,
Down hop determining unit, the mark for the object BBU carried according to described data flow determines the down hop sending described data flow;
Transmitting element, for when the quantity N of the down hop determined is greater than 1, the characteristic parameter of described data flow is utilized from the N number of down hop determined, to select one for sending the down hop of described data flow, described data flow is sent by the down hop of this selection, when N equals 1, the down hop directly determined by this sends described data flow.
12. devices according to claim 11, is characterized in that, described device comprises further:
Resource reservation unit, for reserving resource for described data flow;
Described transmitting element by determine or the down hop selected utilize and reserved send described data flow for the resource sending described data flow.
13. devices according to claim 12, is characterized in that, described resource reservation unit is that described data flow reserves resource by following subelement:
First receives subelement, for receiving the resource reservation request message that source node sends at the forward direction object BBU sending described data flow;
Confirm subelement, for confirming the no resource requirement meeting the described data flow that described resource reservation request message carries of described device;
Route subelement, for when the confirmation result of described confirmation subelement is for being, the mark of the object BBU carried according to described resource reservation request message determines the down hop sending resource reservation request message, if the quantity M of the down hop determined is greater than 1, the characteristic parameter of the described data flow then utilizing described resource reservation request message to carry, and from M the down hop determined, select one for sending the down hop of described resource reservation request message according to selecting one from N number of down hop for the operation sending the down hop of described data flow, described resource reservation request message is sent by the down hop of this selection, if M equals 1, then the direct down hop determined by this sends described resource reservation request message, until arrive object BBU,
Response subelement, for when the confirmation result of described confirmation subelement is no, upper hop sends resource reservation failure response message, the down hop sending described data flow to object BBU is upgraded when receiving resource reservation failure response message to make upper hop, and select new down hop to send described resource reservation request message, until arrive object BBU;
Reserved subelement, for receive object BBU receive described resource reservation request message after according to described resource reservation request message via path receive message to the confirmation resource that source BBU sends time, reserve the resource required for described data flow;
Second receives subelement, the resource reservation failure response message that the down hop for receiving described data flow sends, and upgrades the down hop sending described data flow to object BBU, and selects new down hop to send described resource reservation request message.
14. devices according to claim 13, it is characterized in that, described reserved subelement is when the resource required for reserved described data flow, the timer that the described data flow of further startup is corresponding, if do not receive described data flow within the time that described timer allows, then cancel the resource reservation to described data flow.
15. devices according to claim 13, it is characterized in that, the down hop that the second reception subelement renewal sends described data flow to object BBU comprises: the intermediate equipment arranged for sending described resource reservation failure response message is not the down hop for sending described data flow to object BBU;
The new down hop of described selection sends resource reservation request message and comprises: select from the down hop for sending described resource reservation request message the down hop be not set up, if the quantity of this down hop be not set up is greater than 1, the characteristic parameter of the described data flow then utilizing described resource reservation request message to carry, and select one for sending the down hop of described resource reservation request message according to selecting from N number of down hop in a down hop be never set up for the operation of the down hop sending described data flow, if the quantity of this down hop be not set up equals 1, then the direct down hop be not set up by this sends described resource reservation request message.
16. according to claim 11 to 15 arbitrary described devices, and it is characterized in that, described transmitting element comprises:
Distribute subelement, for valued space corresponding to the hash function of down hop that be used for selecting set is divided into N number of region, N number of region correspondence is distributed to N number of down hop;
Operator unit, for adopting described hash function to carry out Hash operation to the characteristic parameter that described data flow is carried, obtains the first cryptographic Hash;
Determining subelement, for determining the region residing for described first cryptographic Hash from N number of region, down hop corresponding for the region residing for described first cryptographic Hash being defined as the down hop for sending described data flow.
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| CN1633106A (en) * | 2004-12-16 | 2005-06-29 | 中国科学院计算技术研究所 | A transmitter-oriented resource reservation implementing method having backtracking ability |
| CN101272347A (en) * | 2008-04-29 | 2008-09-24 | 华为技术有限公司 | Load sharing method and device |
| CN101505500A (en) * | 2009-03-11 | 2009-08-12 | 中国移动通信集团公司 | Load balance equipment, distributed base station system and communication method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1633106A (en) * | 2004-12-16 | 2005-06-29 | 中国科学院计算技术研究所 | A transmitter-oriented resource reservation implementing method having backtracking ability |
| CN101272347A (en) * | 2008-04-29 | 2008-09-24 | 华为技术有限公司 | Load sharing method and device |
| CN101505500A (en) * | 2009-03-11 | 2009-08-12 | 中国移动通信集团公司 | Load balance equipment, distributed base station system and communication method thereof |
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