WO2012065390A1

WO2012065390A1 - Method, base station and system for detecting r6 interface link in worldwide interoperability for microwave access system

Info

Publication number: WO2012065390A1
Application number: PCT/CN2011/071646
Authority: WO
Inventors: 郑新新
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-11-15
Filing date: 2011-03-09
Publication date: 2012-05-24
Also published as: CN101984695A

Abstract

A method, base station and system for detecting R6 interface link in worldwide interoperability for microwave access (WIMAX) system are provided, and the method includes that at base station side, when a timer for detecting R6 interface link expires, the base station encodes a Spare_Capacity_Rpt message in a radio resource management (RRM) message, writes the address of the local base station both in the source address and the target address in the field of the Spare_Capacity_Rpt message and detects R6 interface link through the Spare_Capacity_Rpt. With the present invention, by performing the link detection using the RRM message in R6 interface, the flow for detecting R6 interface link is simplified, and the detection efficiency is improved. Besides, the access service network gateway (AGW) only plays a part in forwarding and does not produce unnecessary flow, therefore the system resources are saved enormously. Moreover, with the method, the firewall between the base station and the AGW can be penetrated, the R6 interface link detection can be realized for WIMAX network demanding a higher security, and the applicability of the detection method is increased.

Description

R6 port link detection method, base station and system in WIMAX system

The present invention relates to the field of communications technologies, and in particular, to a R6 port link detection method, base station and system in a WIMAX (Worldwide Interoperability for Microwave Access) system. Background technique

Currently, the WIMAX system includes an access network, a core network, and a gateway that connects the access network to the core network, that is, an ASN GW or an AGW (Access Service Network Gate Way). The BS (Base Station) in the access network needs to monitor the link with the AGW in real time with a certain granularity. The link is the R6 interface link. If the link on the R6 interface is faulty, you need to ensure the user experience. Turn off the PA (amplifier) to trigger user terminal switching or off-network. In addition, in order to solve the performance bottleneck of the access network and enhance the robustness of the system, a BS may have a logical connection relationship with multiple AGWs, and may need to perform handover between multiple AGWs. Therefore, the base station needs a real-time monitoring mechanism to monitor. Reliability of the R6 port link.

Currently, there are two main techniques for implementing R6 link detection. One method is to ensure the reliability of the R6 link through a timing Layer 2 ping packet. The other method is to detect the R6 link through a message.

For the first method, the BS periodically sends a ping packet to the AGW. If the ping reply packet is not received multiple times within the time granularity detection interval, it is determined that there is a problem with the link of the R6 port, or the AGW is abnormal. Although this method can solve the link detection of the R6 port, the method cannot be implemented in a network with high security, such as a firewall between the BS and the AGW.

For the second method, a terminal pre-establishment connection request (MS_PreAttachment_Req) message is sent by using a virtual MS (Mobile Station, mobile terminal), and then through Req and The ACK message is acknowledged and the R6 port link detection is completed. However, the method has the following disadvantages: 1. The method has a problem that the message delivery process is too redundant, and three messages are required to complete the R6 port link detection, which is too redundant and cumbersome. If the AGW manages too many BSs, the AGW will be busy processing. This useless information wastes system resources. At this time, it is necessary to set the detection granularity reasonably, otherwise it will seriously affect the system performance. 2. The method of sending the MS-PreAttachment-Req message through the virtual MS to confirm the method will cause the AGW to establish a resource link and other processes. Occurs, which has a large impact on the normal process on the BS side. Summary of the invention

The main purpose of the present invention is to provide a R6 port link detection method, base station and system in a WIMAX system, which aims to simplify the R6 port link detection process, improve the detection efficiency and the application of the detection method, and reduce the impact on the system performance. .

In order to achieve the above object, the present invention provides a R6 port link detection method in a WIMAX system, including:

When the base station R6 link detection timer expires, the base station encodes the Spare Capacity Rpt message in the RRM message, and writes the source address and the destination address in the Spare_Capacity_Rpt message field as the local base station address;

The R6 port link is detected by the Spare_Capacity_Rpt message.

Preferably, the step of detecting the R6 port link by using a Spare-Capacity-Rpt message includes:

And sending the Spare-Capacity-Rpt message packet to the AGW through the R6 port, and starting a retransmission timer;

Determine whether the retransmission timer expires;

If the retransmission timing does not expire, the R6 port receives the data packet sent by the AGW.

Analyzing source address information in a data packet sent by the AGW;

If the source address in the data packet sent by the AGW is the local base station address, the link detection is positive. Normally, the retransmission timer is turned off, and the base station failure counter is cleared; otherwise, it is processed according to the normal RRM message.

Preferably, after the step of determining whether the retransmission timer expires, the method further includes:

If the retransmission timer expires, the base station failure counter is incremented by one;

If the failure counter reaches the upper limit, if yes, the detection process is terminated, and the link detection fails; otherwise, the process of sending the Spare_Capacity-Rpt message into the AGW through the R6 port and starting the retransmission timer is returned.

The invention also provides a R6 port link detecting base station in a WIMAX system, comprising:

The RRM message encoding module is configured to: when the R6 link detection timer of the base station arrives, encode a Spare Capacity Rpt message, and write the source address and the destination address in the Spare_Capacity_Rpt message field as the local base station address;

The link detection module is configured to detect the R6 port link by using the Spare-Capacity-Rpt message.

Preferably, the link detection module includes:

a data packet sending unit, configured to pass the Spare-Capacity-Rpt message into a data packet

The R6 port is sent to the AGW, and the retransmission timer is started.

a determining unit, configured to determine whether the retransmission timer expires;

a data packet receiving unit, configured to receive, by the R6 port, a data packet sent by the AGW when the retransmission timing is not timed out;

An analyzing unit, configured to analyze source address information in a data packet sent by the AGW;

The operation unit is configured to: when the source address in the data packet sent by the AGW is the local base station address, prompt the link detection to be normal, close the retransmission timer, and clear the base station failure counter; otherwise, process according to the normal RRM message.

Preferably, the operating unit is further configured to: when the retransmission timer expires, increase the base station failure counter by one; and determine whether the failure counter reaches an upper limit; if yes, terminate the detection process, prompting The link detection fails. Otherwise, the data packet sending unit sends the Spare-Capacity-Rpt message packet to the AGW through the R6 port, and starts the retransmission timer.

The invention also provides an R6 port link detection system in a WIMAX system, comprising: a base station and an AGW, wherein:

The base station is configured to encode a Spare-Capacity-Rpt message when the R6 port link detection timer expires, and write the source address and the destination address in the Spare-Capacity-Rpt message field as the local base station address; The Spare_Capacity_Rpt message is used to detect the R6 interface link. The AGW is configured to cooperate with the base station to detect the R6 interface link by using the Spare Capacity Rpt message.

Preferably, the AGW is further configured to: when the retransmission timer does not time out, receive a data packet sent by the base station through the R6 interface; analyze the destination address information in the data packet; and send the data packet to the R6 port by using the R6 interface. Destination address;

The base station is further configured to: when the retransmission timer does not time out, receive the data packet sent by the AGW through the R6 interface; analyze the source address information in the data packet sent by the AGW; if the source address in the data packet sent by the AGW is local The base station address indicates that the link detection is normal, the retransmission timer is turned off, and the base station failure counter is cleared; otherwise, the normal RRM message is processed.

Preferably, the base station is a base station as described above.

The R6 port link detection method, the base station and the system in the WIMAX system of the present invention use the R6 port RRM message for link detection, which greatly simplifies the R6 port link detection process and improves the detection efficiency. On the one hand, the Spare-Capacity-Rpt message source address and destination address are written to the base station address to implement the link detection of the R6 port. Only one message can complete the link detection, which is simple and easy, on the other hand, the AGW only starts. The function of forwarding does not generate redundant processes, which greatly saves system resources. In addition, the R6 port link detection method of the present invention can penetrate the firewall between the BS and the AGW, thereby realizing a WIMAX network with high security requirements. R6 port link detection improves the applicability of the detection method. DRAWINGS

1 is a schematic flow chart of an embodiment of a method for detecting an R6 port link in a WIMAX system according to the present invention;

2 is a schematic flowchart of detecting a link of an R6 port by using a Spare Capacity Rpt message in an embodiment of the R6 port link detection method in the WIMAX system of the present invention;

3 is a schematic structural diagram of an embodiment of a R6 port link detecting base station in the WIMAX system of the present invention;

4 is a schematic structural diagram of a link detecting module in an embodiment of a R6 port link detecting base station in the WIMAX system of the present invention;

Figure 5 is a block diagram showing an embodiment of an R6 port link detecting system in the WIMAX system of the present invention. detailed description

The solution of the embodiment of the present invention is to perform link detection by using R6 (Radio Resource Management) message of the R6 port, and specifically write the source address and the destination address of the available resource reporting (Spare Capacity Rpt) to the base station address. Link detection on the R6 interface is implemented to simplify the R6 link detection process and improve detection efficiency.

As shown in FIG. 1, an embodiment of the present invention provides a R6 port link detection method in a WIMAX system, including:

Step S101: When the base station R6 link detection timer expires, the base station encodes the Spare_Capacity_Rpt message in the RRM message, and writes the source address and the destination address in the Spare Capacity Rpt message field as the local base station address.

In this embodiment, the detection of the R6 port link is implemented by using the RRM message. The RRM message is mainly responsible for the interaction between the neighboring area BS configuration information and resource usage rate. The serving base station (ServingBS) can obtain the DCD (Downlink Channel Descirptor) and UCD (Uplink Channel Descirptor) parameters of the neighboring BS through the RRM message. Source usage, etc., implement load balancing between BSs and selection of candidate BSs during MS handover. Taking the Spare-Capacity-Rpt message in the RRM message as an example, the Spare-Capacity-Rpt message includes the available resources of the neighboring cell, the destination address of the message, and the like, and the serving base station receives the Spare-Capacity-Rpt message sent by the neighboring base station through the R6 port. The information about the available resources of the neighboring base station is saved, and is used for subsequent handover and other processes.

In this embodiment, the Spare-Capacity-Rpt message in the RRM message is used. When the system first powers up or the R6 link detection timer (TR6LinkCheck) of the base station arrives, the base station initiates detection of the AGW state (the system may have multiple AGWs, then The base station encodes the Spare_Capacity_Rpt message in the RRM message, and writes the source address and the destination address in the Spare Capacity Rpt message field as the local base station address, so that the base station passes the Spare_Capacity_Rpt message in the RRM message to the R6 portchain. The road is tested.

Step S102: The R6 port link is detected by using a Spare_Capacity_Rpt message.

The base station sends the encoded Spare-Capacity-Rpt message packet to the AGW through the R6 port, and starts a retransmission timer (TWaitSpareRpt), which is used to set a time threshold from message issuance to message feedback. If the time limit is exceeded, the message is considered to be in error. The AGW receives the data packet sent by the base station, analyzes the destination address information in the data packet, and forwards the data packet to the corresponding destination address according to the destination address information in the data packet and the neighboring office information configured by the AGW itself. During the timing of the TWaitSpareRpt, the base station receives the data packet sent by the AGW and analyzes the source address information in the data packet sent by the AGW. If the source address is the local base station address, the R6 interface link detection is normal, and the base station notifies the relevant The module link detection is normal, and the retransmission timer (TWaitSpareRpt) is turned off to clear the failure counter. If the source address is not the local base station address, the message is a normal Spare-Capacity-Rpt message instead of the R6 port link. The process flow message is detected and processed according to the normal RRM message.

If the retransmission timer (TWaitSpareRpt) times out, the base station does not receive the data packet with the source address being the local base station address returned by the AGW, indicating the last time the base station sent the packet. Spare—Capacity—The Rpt message does not receive a reply, and the base station side increments the failure counter by one. If the failure counter reaches the set upper limit N, the base station has not received and received the Spare-Capacity-Rpt message N times, indicating that the R6 port link If the detection fails, the detection process is terminated, the base station notifies the relevant module that the link detection fails; if the failure counter does not reach the set upper limit, the packet of the encoded Spare-Capacity-Rpt message is restarted and sent to the AGW through the R6 port, and Turn on the retransmission timer (TWaitSpareRpt) for the next round of detection.

As shown in FIG. 2, step S102 includes:

Step S1021: Sending a Spare-Capacity-Rpt message packet to the R6 port to the packet

AGW, and start the retransmission timer;

Step S1022, determining whether the retransmission timer has timed out; if yes, proceeding to step S1028; otherwise, proceeding to step S1023;

Step S1023: Receive, by using the R6 interface, a data packet sent by the AGW.

Step S1024, analyzing source address information in the data packet sent by the AGW;

Step S1025, determining whether the source address in the data packet sent by the AGW is the local base station address, and if yes, proceeding to step S1026; otherwise, proceeding to step S1027;

Step S1026, prompting that the link detection is normal, turning off the retransmission timer, and clearing the base station failure counter;

Step S1027, processing according to a normal RRM message;

Step S1028, adding a base station failure counter by one;

Step S1029, determining whether the failure counter reaches the upper limit, and if yes, proceeding to step S1030; otherwise, returning to step S1021;

Step S1030, the detection process is terminated, and the link detection failure is prompted.

The following describes the process of performing R6 port detection in this embodiment in combination with a specific application scenario:

Step 1: BS-side DBS (Database Subsystem) NBSED (Neighbor BS Extended Database), on the R6 port link When the detection timer (TR6LinkCheck) expires, the trigger link detection process starts. The NBSED module sends the BS resource usage status and the total resource status to the RRM module of the SPS (Service Process Subsystem), and fills in the BSID (destination address) of the message to be notified to the BSID of the BS.

Step 2: RRM module group Spare-Capacity-Rpt message, set the message fields, including SourcelD (source ID), DestinationID (destination ID), ReportType (message type), ReportCharacter (message feature), ReportFlag (message flag), etc. Where SourcelD and DestinationID both carry the BSID of the BS delivered by the NBSED module.

Step 3: On the BS side, the RRM module sends the message packet to the AGW through the R6 port through the R6SP (R6 Signal Process) module of the SPS.

Step 4: The RRM module starts the retransmission timer (TWaitSpareRpt), which is used to set the time threshold from message issuance to message feedback. If the time threshold is exceeded, the message is considered to be faulty.

Step 5: Determine if the retransmission timer expires. If the timer expires, go to step 6. Otherwise, go to step 9.

Step 6: The retransmission timer expires, indicating that the Spare_Capacity-Rpt message sent last time has not received a reply, and the BS side failure counter is incremented by one.

Step 7: Determine whether the failure counter reaches the upper limit. If the upper limit is reached N, the BS has not sent and received the Spare_Capacity_Rpt message N times, and the R6 port link detection fails. Go to Step 8. Otherwise, restart Step 1 and wait for the R6 port link detection. The timer resends the message when it expires.

Step 8: The RRM module notifies the SCS (System Control Subsystem) that the R6 port link detection fails, and the SCS performs subsequent operations such as shutting down the PA.

Step 9: On the AGW side, the AGW receives the data packet sent by the BS through the R6 port.

Step 10: The AGW analyzes the message field in the data packet, and determines the destination IP to send the message packet according to the DestinationID in the message field and the neighboring office configured by the AGW itself. address.

Step 11: The AGW forwards the data packet to the destination address through the R6 port. The address at this time is the address of the BS.

Step 12: On the BS side, the R6SP module of the SPS receives the message packet of the AGW and forwards the data packet to the RRM module.

Step 13: The RRM module decodes the message and analyzes the source address carried by the message in the form of a BSID. Step 14: If the source address BSID carried by the message data packet is the BSID of the local BS, proceed to step 15 to perform the R6 link detection related process; otherwise, the message is a normal Spare Capacity Rpt message instead of the R6 link detection process. Message, RRM performs normal process processing.

Step 15: The R6 port link detection process receives the Spare_Capacity_Rpt message forwarded by the AGW. Stop the TWaitSpareRpt timer and clear the failure counter.

Step 16: The RRM module notifies the SCS R6 port that the link detection is successful.

Step 17: The message is a normal Spare-Capacity-Rpt message instead of the R6 port link detection process message, and the RRM performs normal process processing.

Compared with the prior art, the R6 port RRM message is used in the link detection method in this embodiment, which greatly simplifies the R6 port link detection process and improves the detection efficiency. On the one hand, the source address and the destination address of the Spare Capacity Rpt are filled in with their own addresses to implement link detection on the R6 interface. Only one message can complete the link detection, which is simple and easy. On the other hand, the AGW only forwards. The role of the process does not generate redundant processes, which greatly saves system resources.

In addition, the R6 port link detection method described in this embodiment can penetrate the firewall between the base station and the AGW, thereby implementing the R6 port link detection of the WIMAX network with high security requirements.

As shown in FIG. 3, an embodiment of the present invention provides a R6 link detection base station in a WIMAX system, including: an RRM message coding module 301 and a link detection module 302, where: The RRM message encoding module 301 is configured to: when the base station R6 interface link detection timer expires, encode the Spare_Capacity_Rpt message in the RRM message, and write the source address and the destination address in the Spare Capacity Rpt message field as the local base station address;

In this embodiment, the detection of the R6 port link is implemented by using the RRM message. The RRM message is mainly responsible for the interaction between the neighboring area BS configuration information and resource usage rate. The serving base station (ServingBS) can obtain the DCD, UCD parameters and resource usage of the neighbor BS by using the RRM message, and implement load balancing between the BSs and selection of candidate BSs in the MS handover process. Taking the Spare_Capacity_Rpt message in the RRM message as an example, the Spare_Capacity_Rpt message includes the available resources of the neighboring cell, the destination address of the message, and the like. After receiving the Spare-Capacity-Rpt message sent by the neighboring base station through the R6 interface, the serving base station saves the available resource information of the neighboring base station. , used for subsequent switching and other processes.

In this embodiment, the Spare-Capacity-Rpt message in the RRM message is used. When the system first powers up or the R6 link detection timer (TR6LinkCheck) of the base station arrives, the base station initiates detection of the AGW state (the system may have multiple AGWs, then The base station encodes the Spare_Capacity_Rpt message in the RRM message, and writes the source address and the destination address in the Spare Capacity Rpt message field as the local base station address, so that the base station detects the R6 link through the Spare Capacity Rpt message. .

The link detection module 302 is configured to detect the R6 port link according to the Spare Capacity Rpt message.

The base station sends the encoded Spare-Capacity-Rpt message packet to the R6 port to the

AGW, and the retransmission timer (TWaitSpareRpt) is enabled. The retransmission timer is used to set a time threshold from message issuance to message feedback. If the time threshold is exceeded, the message is considered to be in error. The AGW receives the data packet sent by the base station, analyzes the destination address information in the data packet, and forwards the data packet to the corresponding destination address according to the destination address information in the data packet and the neighboring office information configured by the AGW itself. The base station receives the AGW during the timer (TWaitSpareRpt) timing The data packet sent is analyzed, and the source address information in the data packet sent by the AGW is analyzed. If the source address is the local base station address, the link detection of the R6 port is normal, the base station notifies the relevant module that the link detection is normal, and the retransmission timer is turned off. TWaitSpareRpt), clears the failure counter; if the source address is not the local base station address, it indicates that the message is a normal Spare-Capacity-Rpt message instead of the R6 port link detection flow message, and is processed according to the normal RRM message.

If the retransmission timer (TWaitSpareRpt) times out, the base station does not receive the data packet with the source address being the local base station address returned by the AGW, indicating that the Spare-Capacity-Rpt message sent by the last base station did not receive a reply, and the base station side will The failure counter is incremented by one. If the failure counter reaches the set upper limit N, the base station has not received and received the Spare-Capacity-Rpt message N times, indicating that the R6 port link detection fails, the detection process is terminated, and the base station notifies the relevant module that the link detection fails. If the failure counter does not reach the set upper limit, the packet of the encoded Spare-Capacity-Rpt message is restarted and sent to the AGW through the R6 port, and the retransmission timer (TWaitSpareRpt) is started to perform the next round of detection. Process.

As shown in FIG. 4, the link detecting module 302 includes: a data packet sending unit 3021, a determining unit 3022, a data packet receiving unit 3023, an analyzing unit 3024, and an operating unit 3025, where: a data packet sending unit 3021 is configured to Capacity—The Rpt message consists of a data packet sent to the AGW through the R6 port, and the retransmission timer is started; so that the AGW returns the data packet to the base station according to the destination address in the data packet;

The determining unit 3022 is configured to determine whether the retransmission timer expires;

The data packet receiving unit 3023 is configured to receive, by using the R6 port, the data packet sent by the AGW when the retransmission timing is not timed out;

The analyzing unit 3024 is configured to analyze source address information in the data packet sent by the AGW, and the operating unit 3025 is configured to: when the source address in the data packet sent by the AGW is the local base station address, prompting that the link detection is normal, and closing the retransmission timing , and clear the base station failure counter; otherwise, follow the normal RRM message processing. Further, the operation unit 3025 is further configured to: when the retransmission timer expires, increase the base station failure counter by one; and determine whether the failure counter reaches an upper limit; if yes, terminate the detection process, prompting that the link detection fails; otherwise, sending by the data packet The unit 3021 sends the Spare-Capacity-Rpt message packet to the AGW through the R6 port, and starts the retransmission timer.

As shown in FIG. 5, an embodiment of the present invention provides a R6 port link detection system in a WIMAX system, including: a base station 501 and an AGW 502, where:

The base station 501 is configured to encode a Spare-Capacity-Rpt message when the R6 port link detection timer expires, and write the source address and the destination address in the Spare-Capacity-Rpt message field as the local base station address; according to Spare Capacity Rpt The message detects the R6 port link.

The AGW 502 is configured to cooperate with the base station 501 to detect the R6 port link according to the Spare Capacity Rpt message.

In this embodiment, the AGW 502 is further configured to: when the retransmission timer does not time out, receive the data packet sent by the base station 501 through the R6 interface; analyze the destination address information in the data packet; and use the R6 port to send the data packet. Send to the destination address;

The base station 501 is further configured to: when the retransmission timer does not time out, receive the data packet sent by the AGW 502 through the R6 port; analyze the source address information in the data packet sent by the AGW 502; if the data packet sent by the AGW 502 If the source address is the local base station 501 address, the link detection is normal, the retransmission timer is turned off, and the base station 501 failure counter is cleared; otherwise, the normal RRM message is processed.

The base station 501 in this embodiment may be the base station described in the foregoing embodiment.

In the WIMAX system, the R6 port link detection method, the base station, and the system use the R6 port RRM message to perform link detection, which greatly simplifies the R6 port link detection process and improves the detection efficiency. On the one hand, the Spare-Capacity-Rpt message source address and destination address are written to the base station address to implement link detection on the R6 port. Only one message can complete the link detection, which is simple and easy. On the other hand, the AGW only starts. The role of forwarding does not create redundant processes. In addition, the R6 port link detection method of the present invention can penetrate the firewall between the BS and the AGW, thereby realizing the R6 port link detection of the WIMAX network with high security requirements, and improving the detection method. Application.

The above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and equivalent structural or process changes made by the present specification and drawings may be directly or indirectly applied to other related technical fields. The same is included in the scope of patent protection of the present invention.

Claims

Claim

1. A R6 port link detection method in a Worldwide Interoperability for Microwave Access (WIMAX) system, including:

When the base station R6 link detection timer expires, the base station encodes a Spare Capacity Rpt message on the available resources in the Radio Resource Management (RRM) message, and writes the source address and the destination address in the Spare_Capacity_Rpt message field as the local base station. Address

The R6 port link is detected by the Spare_Capacity_Rpt message.

2. The method according to claim 1, wherein the step of detecting the R6 port link by using the Spare_Capacity_Rpt message comprises:

And sending the Spare_Capacity_Rpt message packet to the Access Service Gateway (AGW) through the R6 port, and starting a retransmission timer;

Determine whether the retransmission timer expires;

Analyzing source address information in a data packet sent by the AGW;

If the source address in the data packet sent by the AGW is the local base station address, the link detection is normal, the retransmission timer is turned off, and the base station failure counter is cleared; otherwise, the normal RRM message is processed.

The method according to claim 2, wherein the step of determining whether the retransmission timer has timed out further comprises:

4. A R6 port link detection base station in a WIMAX system, wherein:

An RRM message encoding module, configured to code when the base station R6 link detection timer expires a Spare Capacity Rpt message, where the source address and the destination address in the Spare_Capacity_Rpt message field are both written as a local base station address;

The base station according to claim 4, wherein the link detection module comprises: a data packet sending unit, configured to: pass the Spare-Capacity-Rpt message into a data packet

The R6 port is sent to the AGW, and the retransmission timer is started.

The base station according to claim 5, wherein the operating unit is further configured to: when the retransmission timer expires, increment the base station failure counter by one; and determine whether the failure counter reaches an upper limit; if yes, terminate the detection process, The link detection fails. Otherwise, the data packet sending unit sends the Spare-Capacity-Rpt message packet to the AGW through the R6 port, and starts the retransmission timer.

7. A R6 port link detection system in a WIMAX system, comprising: a base station and an AGW, wherein:

The base station is configured to encode a Spare-Capacity-Rpt message when the R6 port link detection timer expires, and write the source address and the destination address in the Spare-Capacity-Rpt message field as the local base station address; The Spare_Capacity_Rpt message is used to detect the R6 port link; the AGW is used to cooperate with the base station to pass the Spare Capacity Rpt message to the R6 port. The link is detected.

8. The system according to claim 7, wherein

The AGW is further configured to: when the retransmission timer has not expired, receive a data packet sent by the base station through the R6 interface; analyze the destination address information in the data packet; and send the data packet to the destination address through the R6 interface;

The system according to claim 8, wherein the base station is the base station according to any one of claims 4-6.