CN101807950A - Method for realizing loop self-healing function of repeater system - Google Patents

Abstract

The invention provides a method for realizing the loop self-healing function of a repeater system, which comprises the following steps of: designing an FPGA internal software module, and transmitting an identification code with a reserved control word at a data transmission protocol processing module, wherein a main port transmits one identification code and a subsidiary port transmits the other identification code; continuously searching the identification code in received data stream through a link locking module in the data transmission protocol processing module after a light path is normally connected and data is received, wherein the link connection is built only when the received content is accordant, otherwise, the connection is not built; and if the link has not been locked and built when a watchdog timer overflows, exchanging main-subsidiary interfaces of the data protocol processing module with two interfaces between a series-parallel convention module and a parallel-series convention module through a main-subsidiary link switching module. The method can realize the loop self-healing function by the means that no hardware is increased, can not influence the performance of a system, and reduces the networking cost to some extent.

Description

A kind of direct discharging station is realized the method for loop self-healing function

[technical field]

The invention belongs to the field, repeater, specifically be meant a kind of method of direct discharging station realization loop self-healing function.

[background technology]

At railway, the direct discharging station that often can use daisy architecture in the cellular communications system of highway comes assistant base station that the signal covering is carried out in the blind area, can save many base station construction costs like this.Usually additionally add a reserve link for the system reliability of the repeater of improving chain structure, certain node in primary link breaks down, and causes subordinate's link down, can recover normal by reserve link rapidly.As Fig. 1, be that the direct discharging station of daisy architecture under the normal condition is formed, wherein REC is the near-end machine, is used for being connected with the base station, and RE is a remote termination, and the signal that is used for signal blind zone covers.The RE and being connected of REC of its final stage are extension wires, dot.When the RE line failure of a certain level in centre, as shown in Figure 2, this extension wire will be activated, and makes that other normal RE machines of failure level RE back can be by extension wire and REC realization exchanges data.

In implementation method in the past, all be to use the light path switch to realize basically.But the optical switch that is used for high speed data transfer is expensive, and each node all needs to use 1 cover, makes the networking cost of whole network improve many.

[summary of the invention]

Technical problem to be solved by this invention is to provide a kind of direct discharging station to realize the method for loop self-healing function, any hardware mode realization loop self-healing function can not increased, and do not influence systematic function, owing to do not increase extra hardware module, also reduced the networking cost to a certain extent in addition.

The present invention solves the problems of the technologies described above by the following technical solutions:

Step 1:, comprise principal and subordinate's link switchover module and Data Transport Protocol processing module in remote termination design FPGA in house software module; In the Data Transport Protocol processing module, use a reservation control word to send an identification code, a main mouthful of identification code that sends is A, the identification code that sends from mouth is B;

Step 2: system initialization, principal and subordinate's link switchover module has an initial state, and a line lockout Watch Dog Timer picks up counting simultaneously; Before the Watch Dog Timer count value was not overflowed, principal and subordinate's link switchover module kept current state;

Step 3: the line lockout module in the Data Transport Protocol processing module is after light path connects normal and begins to receive data, constantly in the data flow that receives, search the identification code sign, for main mouthful, when the content that only receives is B, just allow the link of link establishment data transmission channel, otherwise will not set up link; Same, for from mouth, when the content that only receives is A, just allows link establishment to connect, otherwise will not set up link;

Step 4: when Watch Dog Timer overflows, link is not also finished locking and is set up, and then realizes that by principal and subordinate's link switchover module the principal and subordinate interface of data protocol processing module exchanges with the interface between string and the parallel serial conversion module; Watch Dog Timer zero clearing reclocking simultaneously;

Step 5: after setting up the data transmission channel link, timer stops counting, and zero clearing, enters standby mode; When the data transmission link of former foundation breaks down and interrupts, then change step 2 over to.

The invention has the advantages that: 1, whole loop self-healing function does not need the ppu intervention, accomplishes automation fully.2, the link adjustment time is short.Through actual test, in 1 minute, finish 1 generally speaking and drag 6 link to readjust and set up new communication channel, by adjusting the duration of Watch Dog Timer, can also further shorten the adjustment time in addition.3, need not set up an other control signal transmission channel between equipment and transmit adjustment information, the raising system reliability reduces cost.

[description of drawings]

The invention will be further described in conjunction with the embodiments with reference to the accompanying drawings.

Fig. 1 is that the direct discharging station of daisy architecture under the normal condition is formed structural representation.

Fig. 2 is that the direct discharging station of daisy architecture when breaking down is formed structural representation.

Fig. 3 is principal and subordinate's mouth docking mode structural representation in the daisy chain type direct discharging station.

Fig. 4 is that FPGA in house software module is formed schematic diagram among the present invention.

[embodiment]

See also shown in Figure 3ly, exist one main mouthful (Master port) and one in the daisy chain type direct discharging station among each RE from mouth (Slave port) (annotate: REC has only main mouth not from mouth).When node failure is arranged, just need allow the RE of back, fault point carry out principal and subordinate's mouth and exchange.This exchanges the process prior art is to realize that by light diverter switch conversion light path the present invention transfers to FPGA inside with this process, switches at the data source end.FPGA in house software module is formed as Fig. 4.The specific implementation step is as follows:

Step 1:, comprise principal and subordinate's link switchover module and Data Transport Protocol processing module in remote termination design FPGA in house software module; In the Data Transport Protocol processing module, use a reservation control word to send an identification code, a main mouthful of identification code that sends is A, the identification code that sends from mouth is B;

Step 2: system initialization, principal and subordinate's link switchover module has an initial state, and a line lockout Watch Dog Timer picks up counting simultaneously; Before the Watch Dog Timer count value was not overflowed, principal and subordinate's link switchover module kept current state.

Step 3: the line lockout module in the Data Transport Protocol processing module is after light path connects normal and begins to receive data, constantly in the data flow that receives, search identification code, here just need to insert the judgment condition that another data transmission link is set up: could realize foundation when having only the content that when receiving terminal decode, detects this identification code and this interface correspondence, when identification code that promptly receive and that oneself send was inconsistent, expression allowed to set up the data transmission channel link.For main mouthful, when the content that only receives is B, just allows link establishment to connect, otherwise will not set up link.Same, for from mouth, when the content that only receives is A, just allows link establishment to connect, otherwise will not set up link.

Step 4: when Watch Dog Timer overflows, link is not also finished locking and is set up, and then realizes that by principal and subordinate's link switchover module principal and subordinate's module of data protocol processing module is gone here and there together and two channel attached interfaces of parallel serial conversion module (being Serdes module among Fig. 4) are exchanged; Watch Dog Timer zero clearing reclocking simultaneously;

Step 5: after setting up the data transmission channel link, timer stops counting, and zero clearing, enters standby mode; When the data transmission link of former foundation breaks down and interrupts, then change step 2 over to.

Beneficial effect of the present invention is: 1, whole loop self-healing function does not need the ppu intervention, accomplishes automation fully. 2, the link adjustment time is short. Through actual test, in 1 minute, finish generally speaking 1 and drag 6 link to readjust and set up new communication channel, by adjusting the duration of Watch Dog Timer, can also further shorten the adjustment time in addition. 3, do not need to set up between several RE an other control signal transmission channel and transmit adjustment information, the raising system reliability reduces cost.

Claims (1)

1. the method for a direct discharging station realization loop self-healing function is characterized in that: comprise the steps:

Step 1:, comprise principal and subordinate's link switchover module and Data Transport Protocol processing module in remote termination design FPGA in house software module; In the Data Transport Protocol processing module, use a reservation control word to send an identification code, a main mouthful of identification code that sends is A, the identification code that sends from mouth is B;

Step 2: system initialization, principal and subordinate's link switchover module has an initial state, and a line lockout Watch Dog Timer picks up counting simultaneously; Before the Watch Dog Timer count value was not overflowed, principal and subordinate's link switchover module kept current state;

Step 3: the line lockout module in the Data Transport Protocol processing module is after light path connects normal and begins to receive data, constantly in the data flow that receives, search the identification code sign, for main mouthful, when the content that only receives is B, just allow the link of link establishment data transmission channel, otherwise will not set up link; Same, for from mouth, when the content that only receives is A, just allows link establishment to connect, otherwise will not set up link;

Step 4: when Watch Dog Timer overflows, link is not also finished locking and is set up, and then realizes that by principal and subordinate's link switchover module the principal and subordinate interface of data protocol processing module exchanges with the interface between string and the parallel serial conversion module; Watch Dog Timer zero clearing reclocking simultaneously;

Step 5: after setting up the data transmission channel link, timer stops counting, and zero clearing, enters standby mode; When the data transmission link of former foundation breaks down and interrupts, then change step 2 over to.

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