CN102761910A

CN102761910A - Service range flow control method

Info

Publication number: CN102761910A
Application number: CN201110108515XA
Authority: CN
Inventors: 毛加轩
Original assignee: Potevio Institute of Technology Co Ltd
Current assignee: Potevio Institute of Technology Co Ltd
Priority date: 2011-04-28
Filing date: 2011-04-28
Publication date: 2012-10-31

Abstract

The invention provides a service range flow control method. The method includes: monitoring the size of a receiving buffer on a base station side; when occupancy of the receiving buffer achieves an alarm threshold, transmitting a GTP-U (general packet radio service tunneling protocol user plane) status report to an SAE-GW (system architecture evolution gateway) so as to inform the SAE-GW of stopping data transmission; and when the receiving buffer is idle, transmitting a GTP-U status report to the SAE-GW to inform the SAE-GW that data can be transmitted. By the service range flow control method, flow control of an S1-U interface can be effectively achieved, and the data loss of a user is avoided.

Description

A kind of flow control methods of service surface

Technical field

The present invention relates to the flow control technique in the GSM, particularly relate to the flow control methods of service surface between evolved base station in the LTE system (eNodeB) and the System Architecture Evolution gateway (SAE-GW).

Background technology

In existing LTE and LTE-A system, the transfer process of user data S1-U interface between eNodeB and SAE-GW (following behavior example) is as shown in Figure 1.As can be seen from the figure; For hold in the end transfer of data for; At down direction, the data of user's application end will send to data receiver through eating dishes without rice or wine with data by eNodeB at last successively through public data network gateway (PDN-GW), SAE-GW and eNodeB.

The service surface protocol stack of S1-U interface is as shown in Figure 2.Can know that from Fig. 2 S1-U interface is based on GPRS user-plane tunnel agreement (GTP-U), udp protocol and IP agreement.At present, the GTP-U agreement itself does not have flow control mechanism, its based on UDP and IP equally do not have the correlative flow controlling mechanism yet.User's application data also is based on UDP, and like this, whole link will have no flow control mechanism.And in practical application, because eNodeB will serve a plurality of users, interface-free resources is limited, so downlink space interface flow (being the rate of discharge that rolls off the production line of eNodeB) maybe be less than the inlet flow rate of the S1-U interface of correspondence.If do not have flow control mechanism at S1-U interface this moment, will cause this user's data to lose, be embodied in eNodeB side buffer memory and overflow.

This shows that the service surface protocol stack of existing S1-U interface can't guarantee the safety of S1-U interface user data between eNodeB and the SAE-GW possibly cause abandoning of user data.

Summary of the invention

In view of this, main purpose of the present invention is to provide a kind of flow control methods of service surface, and this method can effectively realize the flow control of S1-U interface, avoids user data loss.

In order to achieve the above object, the technical scheme of the present invention's proposition is:

A kind of flow control methods of service surface, this method may further comprise the steps:

In the downlink data transmission process of base station, the base station is detected the usage ratio that it receives buffer memory in each dispatching cycle in real time at SAE-GW;

The usage ratio that detects said reception buffer memory when said base station is during greater than the preset alarm threshold value; Be used to indicate the GTP-U buffer status report that stops to send data to said SAE-GW transmission; Said SAE-GW stops to send data to said base station according to this GTP-U buffer status report, and said alarm threshold is less than or equal to 1;

When said base station sending said be used to indicate stop to send the GTP-U buffer status report of data after; When the usage ratio that detects said reception buffer memory first is less than or equal to preset startup threshold value; Be used to indicate the GTP-U buffer status report that can send data to said SAE-GW transmission; Said SAE-GW activates the process of sending data to said base station according to this GTP-U buffer status report, and said startup threshold value is less than or equal to said alarm threshold.

In sum, the flow control methods of the service surface that the present invention proposes is monitored the size that receives buffer memory in base station side; When taking of reception buffer memory reaches alarming threshold; Send the GTP-U status report to SAE-GW, notice SAE-GW stops to send data, when receiving buffer memory during the free time; Send the GTP-U status report to SAE-GW, notice SAE-GW can send data.Like this, can effectively realize the flow control of S1-U interface, the user data loss problem that the reception buffer memory of avoiding base station side has occurred when having expired.

Description of drawings

Fig. 1 is in existing LTE and the LTE-A system, and user data is at the transfer process sketch map of S1-U interface;

Fig. 2 is for having in LTE and the LTE-A system service surface protocol stack sketch map of S1-U interface now;

Fig. 3 is the schematic flow sheet of the embodiment of the invention one.

Embodiment

For making the object of the invention, technical scheme and advantage clearer, will combine accompanying drawing and specific embodiment that the present invention is done to describe in detail further below.

Core concept of the present invention is: the reception buffer memory to base station side is monitored; When finding that receiving taking of buffer memory reaches alarming threshold; Stop to send data through GTP-U buffer status report reporting system architecture evolution gateway; When find receiving buffer memory idle, can send data through GTP-U buffer status report reporting system architecture evolution gateway, to realize flow control to S1-U interface.

The embodiment of the invention one mainly may further comprise the steps:

Step 301, at SAE-GW in the downlink data transmission process of base station, the base station is detected the usage ratio that it receives buffer memory in each dispatching cycle in real time.

Step 302, the usage ratio during that detects said reception buffer memory when said base station greater than the preset alarm threshold value; Be used to indicate the GTP-U buffer status report that stops to send data to said SAE-GW transmission, said SAE-GW stops to send data to said base station according to this GTP-U buffer status report;

When said base station sending said be used to indicate stop to send the GTP-U buffer status report of data after; When the usage ratio that detects said reception buffer memory first is less than or equal to preset startup threshold value; Be used to indicate the GTP-U buffer status report that can send data to said SAE-GW transmission, said SAE-GW activates the process of sending data to said base station according to this GTP-U buffer status report.

Said alarm threshold is less than or equal to 1.In practical application, this said alarm threshold can be provided with according to the size that base station side receives buffer memory.Particularly, said alarm threshold can be directly proportional with the size of said reception buffer memory.If should be worth be provided with too small, and then can cause under the more situation of idling-resource, stopping the transmission of data; Thereby reduce the transmission rate of data; And cause the waste of resource, if should value be provided with excessive, then can cause because the reception buffer memory of failing due to the alarm in time overflows.

Said startup threshold value is less than or equal to said alarm threshold.Preferably, said startup threshold value is identical with said alarm threshold.

Preferably, said GTP-U buffer status report can carry through the length field of GTP-U protocol package encapsulation header.Further, when the length field of said GTP-U protocol package encapsulation header is zero, can indicate said SAE-GW to stop to send data; When the length field non-zero of said GTP-U protocol package encapsulation header, can indicate said SAE-GW can send data.

Consider; In the existing protocol, the field value 4 of the message type field of GTP-U protocol package encapsulation header is not used, therefore; Here message type field that can GTP-U protocol package encapsulation header is set to 4, has carried the GTP-U buffer status report to indicate said GTP-U protocol package.Like this, when the message type field that detects the encapsulation header of the GTP-U protocol package that receives as SAE-GW was 4, promptly this GTP-U protocol package of decidable had been carried the GTP-U buffer status report.

In the above-mentioned steps, detect in real time, can effectively guarantee when the reception buffer memory reaches alarm threshold through reception buffer memory to base station side; Notice SAE-GW stops the transmission of data, and receives buffer memory when idle stopping to detect after data are sent, and the usage ratio that promptly receives buffer memory is when starting threshold value; Again trigger SAE-GW and send data; So, can effectively realize the flow control of S1-U interface, avoid user data loss.

In sum, more than being merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims

1. the flow control methods of a service surface is characterized in that, this method may further comprise the steps:

In the downlink data transmission process of base station, the base station is detected the usage ratio that it receives buffer memory in each dispatching cycle in real time at System Architecture Evolution gateway SAE-GW;

The usage ratio that detects said reception buffer memory when said base station is during greater than the preset alarm threshold value; Be used to indicate the GPRS user-plane tunnel agreement GTP-U buffer status report that stops to send data to said SAE-GW transmission, said SAE-GW stops to send data to said base station according to this GTP-U buffer status report;

2. method according to claim 1 is characterized in that, said GTP-U buffer status report carries through the length field of GTP-U protocol package encapsulation header.

3. method according to claim 2 is characterized in that, when the length field of said GTP-U protocol package encapsulation header is zero, indicates said SAE-GW to stop to send data; When the length field non-zero of said GTP-U protocol package encapsulation header, indicate said SAE-GW can send data.

4. method according to claim 2 is characterized in that, when the message type field of said GTP-U protocol package encapsulation header is 4, indicates said GTP-U protocol package to carry the GTP-U buffer status report.

5. method according to claim 1 is characterized in that said alarm threshold is less than or equal to 1.

6. method according to claim 1 is characterized in that, said alarm threshold is according to the size setting of said reception buffer memory.

7. method according to claim 1 is characterized in that, said alarm threshold is directly proportional with the size of said reception buffer memory.