WO2003063531A1

WO2003063531A1 - A method for detecting a land circuit in a bss system

Info

Publication number: WO2003063531A1
Application number: PCT/CN2003/000064
Authority: WO
Inventors: Zhili Xia
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2002-01-24
Filing date: 2003-01-23
Publication date: 2003-07-31

Abstract

The present invention is objected to a method for detecting a land circuit in a BSS system. In a cellular mobile communication system such as GSM, a physical connection between a base station and base station controller is very complex. Recently, there is short of detection method for efficiency of a land transmission. Maintainers are needed when the land transmission is faulted. The method according to the invention detects the connection status by transmitting a TRAU frame to a land circuit between a carrier frequency baseband process unit and a transcoder/rate adaptation unit in a base station transceiver. The connection for an uplink land circuit can be located more efficiently and automatically, and the maintainability of the BSS system can be improved.

Description

Method for detecting ground circuit of mobile communication base station subsystem

The invention relates to the technical field of GSM mobile communication systems, in particular to a method for automatically detecting a ground circuit of a base station subsystem (BSS) in a GSM mobile communication system. Background of the invention

The cellular mobile system is a huge network system with the following characteristics:

(1) There are many sites and a wide distribution. Only one of the base station subsystems (BSS) covers a large area. Often, there are many base transceiver stations (BTS), which are distributed in different locations. Therefore, the GSM system The physical connection from the base station (BTS) to the base station controller (BSC) is very complicated, and it often passes through the relay of transmission equipment, coupled with the diversity of transmission equipment, the uneven quality of network installation and construction personnel, and other factors. It is difficult to ensure that all base station BTSs are properly connected to the base station controller BSC.

(2) In the GSM system, the position of the code conversion rate adaptation processor (TRAU) is flexible and can be placed on the BTS side, BSC side, and mobile switching center (MSC) side. In order to save the transmission cost of the Abis interface and the A interface, ■ TRAU—Generally placed on the MSC side or the BSC side, so in this case, multiplexing and demultiplexing equipment should be used between the TRAU and the base station controller.

(3) In order to expand the capacity of the BSS system, the ground connection often adopts a multi-level switching structure, which makes the links of transmission, relay and transfer more complicated.

(4) Because the GSM system needs to be frequently expanded, intermediate physical transmissions are often changed, and the network configuration often needs to be modified. As a result, the circuit connection between the carrier frequency slot baseband processing unit and the TRAU unit is difficult to ensure security.

Since the GSM system is a circuit-switched system, in the ground transmission, the signaling link and the service link are performed by different circuits, and serious transmission occurs in the signaling link or the control and maintenance circuit. When the problem occurs, the system can still identify it; and when there is a software or hardware problem in the circuit transmission, relay, and transfer of the GSM. Service layer, the system is difficult to identify, causing a serious transmission problem in the ground service circuit, such as : One-way, two-way, noise, some data services cannot communicate normally, etc. The system is still unknown. On the other hand, because the transmission, relay, and transfer links of the BSS ground circuit are extremely complicated, it is very inconvenient to find out if there is a problem, especially manual maintenance inspection.

So far, there is no necessary detection method for the effectiveness of the ground transmission, and the maintenance of the ground circuit of the base station subsystem is still manual operation. Whether it is initial installation, expansion, or fault maintenance during operation, it is quite difficult. Only the network maintenance personnel can manually check whether the related transmission, relay, and transfer are normal according to the phenomenon and the scope of the problem. Or, by performing various physical operations on the network and conducting a large number of call tests, to locate the relevant A interface circuit or Abis interface circuit and the links that cause problems. These detection methods not only have very low efficiency, but also perform artificial operations on the network; they not only affect online users, but also easily lead to artificial network accidents. Summary of the Invention

The purpose of the present invention is to provide a base station subsystem BSS ground circuit detection method. During the network implementation and network operation and maintenance of the BSS system, the ground circuit connection between the carrier frequency baseband time slot processing unit and TRAU is effectively and automatically Detect, quickly detect and locate transmission, relay, and transfer problems on ground circuits.

The invention is realized by the following technical solutions:

A mobile communication base station subsystem (BSS) ground circuit detection method is characterized in that the method includes at least the following steps:

A) The base station controller (BSC) connects the uplink and downlink ground circuits between the carrier frequency slot baseband processing unit and the code conversion rate processing unit (TRAU) to be detected, and saves the connection letter. ir ·

B) Through the carrier frequency downlink maintenance channel between the carrier frequency slot baseband processing unit and the BSC, the BSC issues a channel activation or maintenance detection command to the carrier frequency slot baseband processing unit;

C) After the carrier frequency slot baseband processing unit is activated or receives a maintenance command, it continuously sends normal TRAU frames to the TRAU unit through the uplink ground circuit to perform in-band control on the TRAU unit and start a timer;

D) The TRAU unit is activated in-band or receives the maintenance detection command issued by the BSC through the TRAU downlink maintenance pass, and then sends the corresponding TRAU frame to the carrier frequency slot baseband processing unit through the downlink ground circuit;

E) judging whether the carrier frequency slot baseband processing unit receives a response TRAU frame before the timer expires, if yes, the uplink and downlink ground circuits between the carrier frequency slot baseband processing unit and the TRAU unit are considered normal; otherwise, it is considered that The uplink and downlink ground circuits are abnormal, and the carrier frequency slot baseband processing unit reports the detection result to the BSC through the carrier frequency uplink maintenance channel.

A mobile communication base station subsystem (BSS) ground circuit detection method is characterized in that the method includes the following steps:

A) The base station controller (BSC) connects the uplink ground circuit between the carrier frequency slot baseband processing unit and the code conversion rate processing unit (TRAU) to be detected, and saves the connection information of the uplink ground circuit;

B) The BSC issues an activation or maintenance detection command to the carrier frequency slot baseband processing unit through the carrier frequency downlink maintenance channel;

C) After the carrier frequency slot baseband processing unit receives the maintenance detection command, it continuously sends a normal TRAU frame to the TRAU through the uplink ground circuit;

D) The TRAU unit is activated in-band or receives a BSC downlink maintenance through TRAU to issue a maintenance detection command and starts a timer;

E) Determine whether the TRAU unit receives a TRAU frame before the timer expires, and if it can When a TRAU frame is received, it indicates that the uplink ground circuit is normal. If a TRAU frame cannot be received, it indicates that the uplink ground circuit is abnormal. TRAU reports the detection result to the BSC through the TRAU uplink maintenance channel.

A) The base station controller (BSC) connects the downlink ground circuit between the carrier frequency slot baseband processing unit and the code conversion rate processing unit (TRAU) to be detected, and saves the connection information;

B) Through the carrier frequency downlink maintenance channel between the carrier frequency slot baseband processing unit and the BSC, the BSC issues a channel activation or maintenance detection command to the carrier frequency slot baseband processing unit.

C) After the carrier frequency slot baseband processing unit is activated or receives a maintenance command,

D) After the TRAU unit receives the maintenance detection command, it continuously sends TRAU frames to the carrier frequency time slot baseband processing unit through the downlink ground circuit;

E) Determine whether the carrier frequency slot baseband processing unit receives a TRAU frame before the timer expires, and if so, consider that the downlink ground circuit between the carrier frequency slot baseband processing unit and the TRAU unit is normal; otherwise, consider the downlink ground The circuit is abnormal, and the carrier frequency slot baseband processing unit reports the detection result to the BSC through the carrier frequency uplink maintenance channel.

The invention can efficiently detect the ground circuit connection problem between the TRAU unit in the BSS system and the baseband processing unit of the base station transceiver carrier frequency time slot, and can accurately locate the uplink ground circuit failure, the downlink ground circuit failure, or the uplink and downlink The ground circuit as a logical overall ground circuit fails, which improves the maintainability of the BSS system, guarantees the service quality of the GSM network, and reduces the risk of human operation. Figure 1 is a schematic diagram of the structure of the BSS system.

Figure 2 is a schematic diagram of the detection of the uplink ground circuit and the downlink ground circuit of the BSS system as a whole.

Figure 3 is a schematic diagram of the uplink ground circuit detection of the BSS system.

Figure 4 is a schematic diagram of the downlink ground circuit detection of the BSS system. Mode of Carrying Out the Invention

The present invention is described in detail below with reference to the drawings.

As shown in the simplified BSS structure diagram in Figure 1, the BSS system includes a code conversion rate adaptation processing unit (TRAU) 2, a base station controller (BSC) 3, and a base transceiver station (BTS) 4, and a code conversion rate adaptation process. The unit (TRAU) 2 is the interface of the BSS system facing the mobile switching center (MSG) 1, and the base transceiver station (BTS) 4 is the wireless-oriented interface of the BSS system. The code conversion rate adaptation processing unit (TRAU) 2 and the switching unit of the base station controller (BSC) 4 are connected through a TRAU maintenance channel 5. The control unit 31 of the base station controller (BSC) 3 and the base transceiver station (BTS) 4 are connected through a carrier frequency maintenance channel 6. There is an uplink ground circuit 71 between the carrier frequency slot baseband processing unit 41 of the base transceiver station (BTS) 4 and the corresponding code conversion rate adaptation processing unit (TRAU) 2. The uplink ground circuit 71 covers the ground of most BSS systems Circuit. For simplified description in FIG. 1, a base transceiver station (BTS) 4 and a code conversion rate adaptation processing unit (TRAU) 2 are each drawn. In the actual GSM network structure, the number of base transceiver stations (BTS) 4 is large and widely distributed, and the base transceiver station (BTS) 4 and the base station controller (BSC) 3 often need to pass through optical transmission relay equipment. Code conversion rate adaptation processing unit (TRAU) 2 is numerous, although the code conversion rate adaptation processing unit (TRAU) 2 is maintained and managed by the base station controller (BSC) 3, in order to save transmission resources, the code conversion rate Adaptation processing unit (TRAU) 2 as close as possible On the mobile switching center (MSC) 1 side, the code conversion rate adaptation processing unit (TRAU) 2 and the base station controller (BSC) 3 need to be multiplexed and demultiplexed.

Example 1

Referring to FIG. 2, FIG. 2 is a schematic diagram of the principle of detecting the uplink ground circuit and the downlink ground circuit of the BSS system as a logical whole. The information between the control unit 31 in the base station controller (BSC) 3 and the carrier frequency slot baseband processing unit 41 in the base transceiver station 4 (BTS) is transmitted through the carrier frequency maintenance channel 6. The carrier frequency maintenance channel is Signalling link or operation and maintenance link; TRAU frames are transmitted between the carrier frequency slot baseband processing unit 41 and the TRAU unit 2 through a ground circuit 7, which is a voice service or a circuit data service channel, covering the BSS System ground circuit; The control unit 31 and TRAU unit 2 in the BSC perform detection using a single ground circuit as a logical unit, and take the uplink ground circuit and the downlink ground circuit as a whole. The results of the test do not include the uplink ground circuit and the downlink ground circuit. Anomalies are distinguished.

The detection method of the BSS ground detection circuit is explained as follows:

(1) First, the base station controller connects the uplink ground circuit 71 and the downlink ground circuit 72 between the carrier frequency slot baseband processing unit 41 and the corresponding TRAU unit 2 to be detected, and usually completes the carrier frequency slot baseband processing unit. One-level or multi-level circuit exchange with the corresponding TRAU unit, and save the connection information of related links, where the connection information contains detailed resource occupation information in the carrier frequency slot base station;

(2) The control unit 41 of the base station controller issues a channel activation or ground circuit maintenance detection command to the carrier frequency time slot baseband processing unit through the carrier frequency downlink maintenance channel 62;

(3) After the carrier frequency slot baseband processing unit 41 is activated or accepts the maintenance detection command of the ground circuit, it sends the normal TRAU to the TRAU unit 2 through the uplink ground circuit 71 continuously. A frame, the TRAU frame includes a voice service frame, or a data service frame, or an operation and maintenance frame, or a large number of idle bits (BITs) of the operation and maintenance frame carrying a random sequence and a frame sequence number sequence, or the above-mentioned various frames and / or sequences In combination, the in-band control is performed on the TRAU unit 2 and a ground circuit detection timer is started. The ground circuit detection timer may be set in the carrier frequency slot baseband processing unit 41;

(4) After the TRAU unit 2 is activated in-band or receives the maintenance detection command of the ground circuit, it sends a corresponding TRAU frame to the carrier frequency slot baseband processing unit 41 through the downlink ground circuit 72;

(5) If the carrier frequency slot baseband processing unit 41 receives a certain number of corresponding TRAU frames before the ground circuit detection timer expires, the carrier frequency uplink maintenance channel 61 reports the carrier frequency to the control unit 31 in the BSC. The normal information of the ground circuit between the timeslot baseband processing unit 41 and the TRAU unit 2. On the contrary, if a certain number of corresponding TRAU frames are not received before the ground circuit detection timer expires, the carrier frequency uplink maintenance channel 61 is used. The control unit 31 in the BSC reports information about the abnormality of the ground circuit between the carrier frequency slot baseband processing unit and the TRAU unit; the control unit 31 in the BSC reports the detection result of the measured ground circuit together with the saved connection information of the related links. Notify maintenance personnel after handling.

The time setting of the above ground circuit detection timer should be greater than twice the one-way transmission time of the TRAU frame between the carrier frequency baseband processing unit and the TRAU unit; for the sake of insurance, the time of the ground circuit detection timer can be set to the TRAU frame on-load The one-way transmission time between the frequency slot baseband processing unit and the TRAU unit is more than four times. For the setting of specific time values, the thresholds for receiving downlink voice service frames, data service frames, or operation and maintenance frames need to be considered. The one-way transmission time of the TRAU frame between the carrier frequency baseband processing unit and the TRAU unit is approximately 40 to 60 milliseconds, which does not simply mean that the physical transmission time of the TRAU frame between the carrier frequency baseband processing unit and the TRAU unit is 20 milliseconds.

This test can be performed in the maintenance state as a function of the ground circuit test of the special BSS system. Style. In this way, the BSC traverses all the base station transceiver carrier frequency time slot baseband processing units and all TRAU units under its jurisdiction in a certain way, and can detect most of the ground circuits of the BSS system; During capacity expansion and upgrade, data configuration modification, and network ground circuit equipment changes, some base station transceiver carrier frequency time slot baseband processing units and some TRAU units can be traversed to perform maintenance testing on some BSS ground circuits; or on other networks In the case of action or when a ground circuit problem has been found, it is used to specifically detect and locate all or part of the ground circuit of the BSS system.

In this way, when the control unit of the base station controller sends the maintenance detection command of the ground circuit to the carrier frequency slot baseband processing unit, it can carry the identification information of the corresponding TRAU unit in the form of command parameters, and the TRAU unit uses the maintenance detection mode. When activated, it can carry the identification information of the TRAU unit in the idle BIT in its downlink operation and maintenance frame. When the carrier frequency slot baseband processing unit receives the TRAU, the identification information is used to determine whether it is sent by the TRAU unit corresponding to the detection circuit. The operation and maintenance frame is used to detect whether the connection function of the switching mechanism between the carrier frequency slot baseband processing unit and the TRAU unit is correct. The identification information of the TRAU unit can be issued to the TRAU unit through the base station controller during network data configuration, or the TRAU unit can be automatically identified by the physical configuration location of the device.

The detection method of the BSS ground circuit can also be performed during the normal operation of the network. That is, when the carrier frequency slot baseband processing unit is implemented during normal services, such as when the assignment or switching is activated, the above-mentioned ground circuit detection timer is started. If a certain number of response TRAU frames are received by the TRAU unit before the timer expires, It is considered that the corresponding ground circuit is normal. In order not to increase the processing load of the BSC control processing unit, during the network operation, all ground circuits are transmitted normally by default, and no information is reported at this time; otherwise, the corresponding ground circuit is considered to be faulty. The corresponding ground circuit problem is reported to the BSC host, so that if the BSS ground circuit problem occurs during the operation of the network, the BSS system can immediately know which ground circuits are faulty. This function can also be set as a switch in the baseband processing unit of the carrier frequency slot and turned on when necessary. Or off. The detection of the ground circuit in this operating state not only maintains regular monitoring of the ground circuit, but also does not increase the system processing and transmission load. If this scheme is adopted, the time setting of the ground circuit detection timer should be greater than the sum of the round-trip time for transmitting TRAU frames between the baseband processing unit and the TRAU unit of the carrier frequency slot and the lag time between the two. The lag time is Compared to the carrier frequency slot baseband processing unit activation time.

Regardless of whether the BSS provides a ground circuit detection function in the running state or the BSS provides a special ground circuit detection in the maintenance state, the BSS system should provide detailed information of the detected ground circuit as much as possible, such as: Information about the resources occupied in each link; it can also be information about the resources of the transmission, relay, and switching equipment, such as the time slots occupied in each physical link of the Abis interface. The above information is related to the accuracy of the ground circuit positioning detection.

Example 2

This embodiment provides a special detection for the uplink ground circuit of the BSS system when the network is abnormal or when it is considered necessary to perform an inspection. As shown in FIG. 3, the principle diagram of the uplink ground circuit detection of the BSS system is shown.

First, the base station controller (BSC) 3 connects the uplink ground circuit 71, which usually completes one or more levels of circuit switching in the uplink ground circuit 71, and saves connection information of related links. The connection information includes the uplink ground circuit. Resource occupation information in transmission, relay and transfer equipment.

After the circuit switching of the upstream ground circuit is completed, the base station controller (BSC) 3 issues an activation or maintenance detection command to the carrier frequency slot baseband processing unit 41 through the carrier frequency downlink maintenance channel 62.

(TRAU) 2 Issue a maintenance inspection command. TRAU maintenance channel 5 includes TRAU uplink maintenance channel 51 and TRAU downlink maintenance channel 52.

The carrier frequency slot baseband processing unit 41 receives the maintenance issued by the base station controller (BSC) 3 After detecting the command, the TRAU frame is continuously sent to the code conversion rate adaptation processing unit (TRAU) 2 through the uplink ground circuit 71, and a large number of idle BITs can be used to carry a random sequence and a frame sequence number sequence for transmission. The above-mentioned TRAU frame can identify the operation maintenance frame and the normal service frame according to the control BIT therein.

After receiving the maintenance detection command from the base station controller (BSC) 3, the code conversion rate adaptation processing unit (TRAU) 2 starts the detection timer of the uplink ground circuit 71. Before the timer expires, if it can receive a slave The TRAU frame sent by the frequency slot baseband unit 41 indicates that the uplink ground circuit 71 is normal, and the detection timer is cleared, and the test is ended. The operation and maintenance frames conform to the random sequence and frame sequence number sequence rules of the sender.

Before the detection timer expires, if the TRAU frame sent from the carrier frequency slot baseband unit 41 cannot be received, it indicates that the uplink ground circuit is faulty, and the code conversion rate adaptation processing unit (TRAU) 2 sends a request to the TRAU uplink maintenance channel 51. The BSC 3 reports the detection result of the uplink ground circuit 71. The connection information of the relevant links of the road is reported to the BSC 3 maintenance station, and the maintenance station will process it. The channel of the maintenance platform and the control processing unit 31 of the BSC 3 is used for displaying the ground circuit detection information, and is not the main body for implementing the ground circuit detection mechanism. The above detection timer is set in the TRAU unit.

The base station controller (BSC) 3 traverses the carrier frequency service time slot baseband processing unit 41 and the code conversion rate adaptation processing unit (TRAU) under test under its jurisdiction in a certain manner, and can analyze most of the The uplink ground circuit of the BSS system performs detection. For example, in the case of system expansion and upgrade, data configuration modification, and network ground circuit equipment changes, the new partial carrier frequency time slot unit 41 and the new partial code conversion rate adaptation processing unit (TRAU) are traversed twice to perform Part of the uplink ground circuit of the BSS system for maintenance inspection; or in the case of other network actions or problems found on the ground circuit, used for all or part of the BSS system Perform special inspections on the uplink ground circuit, and locate relevant links where problems occur.

When the control unit of the base station controller sends the maintenance detection command of the uplink ground circuit to the TRAU unit, the identification information of the corresponding carrier frequency slot baseband processing unit may be carried in the form of command parameters, and the operation of the carrier frequency slot baseband processing unit is sent upward. The idle BIT in the maintenance frame can carry the identification information of the carrier frequency slot baseband processing unit. When the TRAU unit performs maintenance and reception on the TRAU sent by the carrier frequency slot baseband processing unit, the identification information is used to determine whether it is the circuit being detected. The operation and maintenance frame sent by the corresponding carrier frequency slot baseband processing unit is used to detect whether the connection function of the switching mechanism between the carrier frequency slot baseband processing unit and the TRAU unit is correct. The identification information of the carrier frequency time slot baseband processing unit can be delivered to the carrier frequency time slot baseband processing unit through the base station controller during network data configuration, or the carrier frequency time slot baseband processing unit can be automatically identified by the physical configuration location of the device. The BSC control mechanism is not required to issue the identification information to the carrier frequency slot baseband processing unit. Through the operation and maintenance of a large number of idle BITs between the baseband processing unit and the code conversion rate adaptation processing unit (TRAU) 2 of the carrier frequency slot, the generation and detection mechanism of a random BIT sequence and a TRAU frame sequence can be added to detect the uplink ground circuit. Transmission quality problems, including high bit error problems and sliding frame problems.

The TRAU frame between the carrier frequency slot baseband processing unit and the code conversion rate adaptation processing unit (TRAU) 2 is unidirectionally transmitted between the carrier frequency baseband slot processing unit 41 and the code conversion rate adaptation processing unit (TRAU) 2 The time is about 40 to 60 milliseconds, which does not simply refer to the physical transmission time of the TRAU frame between the code conversion rate adaptation processing unit (TRAU) 2 and the carrier frequency slot baseband processing unit 41. The time period is 20 milliseconds.

For safety, the time of the uplink ground circuit timer is generally set to be more than twice the unidirectional transmission time of the TRAU frame in the uplink ground circuit 71. In this embodiment, the time of the uplink ground circuit timer is set to 80 milliseconds to 120 milliseconds.

When the network is operating normally, this method can be used to regularly detect the uplink ground circuit of the BSS system during normal operation. The specific method is as follows: Code conversion rate adaptation processing unit (TRAU) 2 When activated during the detection process, the uplink ground circuit detection timer is started at the same time. If a certain number of TRAU frames are received before the timer expires, the corresponding uplink ground circuit is considered normal. In order not to add a base station controller The processing load of the control processing unit 31 of the (BSC) 3 may not report information at this time (but there is no such limitation). Then, during the network operation, all ground circuits are transmitted normally by default. Conversely, the BSS system considers that the corresponding uplink ground circuit is faulty, and reports the corresponding uplink ground circuit problem to the host of the base station controller (BSC) 3. In this way, the BSS system can keep regular monitoring of the uplink ground circuit 71 during network operation. The time of the detection timer is generally set to be more than twice the one-way transmission time of the TRAU frame in the uplink ground circuit 71. In this embodiment, the time of the uplink ground circuit timer is set to 80 milliseconds to 120 milliseconds. In the above-mentioned method for performing regular detection, a switch can also be set in the code conversion rate adaptation processing unit (TRAU) 2. The control unit of the base station controller (BSC) 3 controls the opening and closing of the detection timer through the TRAU downlink maintenance channel. shut down.

Example 3

This embodiment provides a method for detecting a downlink ground circuit. Refer to FIG. 4, which is a schematic diagram of a detection method of a downlink ground circuit. The specific detection methods are as follows:

First, the base station controller (BSC) 3 connects the downlink terrestrial circuit 72 between the baseband processing unit and the code conversion rate processing unit (TRAU) 2 of the carrier frequency slot to be detected, which usually completes a stage in the downlink terrestrial circuit 72. Or multi-level circuit switching, and save connection information of related links, and the connection information includes resource occupancy information of the downlink ground circuit in transmission, relay, and switching equipment.

Secondly, through the carrier frequency downlink maintenance channel 62 between the carrier frequency slot baseband processing unit 41 and the control unit 31 in the BSC 3, the control unit 31 in the BSC 3 issues a channel activation or A maintenance detection command, and issues a maintenance detection command to the TRAU through the TRAU downlink maintenance channel 52;

Secondly, after the carrier frequency slot baseband processing unit 41 is activated or receives a maintenance command, it starts. A downlink ground circuit detection timer;

Next, after the TRAU unit 2 receives the maintenance detection command, it continuously sends TRAU frames to the carrier frequency slot baseband processing unit through the downlink ground circuit 72;

The carrier frequency slot baseband processing unit 41 determines whether a TRAU frame is received before the downlink terrestrial circuit 72 detects that the timer expires. If so, the downlink terrestrial circuit between the carrier frequency slot baseband processing unit 41 and the TRAU unit 2 is considered normal. Otherwise, it is considered that the downlink ground circuit 72 is abnormal, and the carrier frequency slot baseband processing unit 41 reports the detection result to the control unit 31 in the BSC 3 through the carrier frequency uplink maintenance channel 61.

Finally, the downlink ground circuit detection timer is cleared, and the BSC 3 reports the detection result of the measured uplink ground circuit together with the connection information of the processed ground circuit related links to the maintenance station of the BSC 3 for processing by the maintenance station. The channel of the maintenance station and its control processing unit 31 of BSC 3 is used for displaying the ground circuit detection information, and is not the main body of the ground circuit detection mechanism.

The time setting of the above ground circuit detection timer should be greater than twice the unidirectional transmission time of the TRAU frame between the carrier frequency baseband processing unit and the TRAU unit.

In a certain way, BSC 3 traverses the baseband processing unit 41 of the carrier frequency service slot under test and the TRAU 2 under test under its jurisdiction to detect the ground circuits of most BSS systems. For example, in the case of system expansion and upgrade, data configuration modification, and network ground circuit equipment changes, the traversal of the newly added carrier frequency time slot unit 41 and the newly added TRAU 2 can perform maintenance inspection on some downlink ground circuits of the BSS system. ; Or when other network actions occur or a ground circuit problem has been found, it is used to specifically detect all or part of the downlink ground circuit of the BSS system and locate the relevant links where the problem occurs.

When the control unit of the base station controller sends the maintenance detection command of the downlink ground circuit to the carrier frequency slot baseband processing unit, it can carry the identification information of the corresponding TRAU unit in the form of command parameters. When the TRAU unit is activated in the maintenance detection mode, it can Operation and maintenance in its downstream The idle BIT in the frame carries the identification information of the TRAU unit. When the carrier frequency slot baseband processing unit receives the TRAU, the identification information is used to determine whether it is an operation and maintenance frame sent by the TRAU unit corresponding to the detection circuit. It is used to detect the carrier frequency. Whether the connection function of the switching mechanism between the time slot baseband processing unit and the TRAU unit is correct. The identification information of the TRAU unit can be transmitted to the TRAU unit through the base station controller during network data configuration, or the TRAU unit can be automatically identified by the physical configuration location of the device. At this time, the BSC control mechanism is not required to issue the identification information to the TRAU unit. Through the operation and maintenance of a large number of idle BITs between the carrier frequency slot baseband processing unit and the code conversion rate adaptation processing unit (TRAU) 2, the generation and detection mechanism of a random BIT sequence and a TRAU frame sequence can be added to detect the uplink ground circuit. Transmission quality problems, including high bit error problems and sliding frame problems.

Since the TRAU unit needs to receive a maintenance detection command or a TRAU frame from a carrier frequency baseband time slot processing unit, it can send a TRAU frame to the carrier frequency baseband time slot processing unit. Therefore, when performing downlink ground circuit detection, generally Testing is not performed during normal operation, but is usually performed during maintenance.

Claims

Claim

1. A method for detecting a ground circuit of a mobile communication base station subsystem (BSS), which is characterized in that the method includes at least the following steps:

A) The base station controller (BSC) connects the uplink and downlink ground circuits between the carrier frequency slot baseband processing unit and the code conversion rate processing unit (TRAU) to be detected, and saves the connection information.

D) The TRAU unit is activated in-band or receives the maintenance detection command issued by the BSC through the TRAU downlink maintenance pass, and then sends a response TRAU frame to the carrier frequency slot baseband processing unit through the downlink ground circuit;

E) Determine whether the carrier frequency slot baseband processing unit receives a response TRAU frame before the timer expires. If it is, then it is considered that the uplink and downlink ground circuits between the carrier frequency slot baseband processing unit and the TRAU unit are normal; otherwise, it is considered that The uplink and downlink ground circuits are abnormal, and the carrier frequency slot baseband processing unit uploads the detection result to the BSC through the carrier frequency uplink maintenance channel.

2. The detection method according to claim 1, further comprising: clearing the timer, and the BSC sends the detection result together with the resource occupation information of the processed ground circuit to the maintenance station for maintenance. Platform for processing.

3. The detection method according to claim 1, wherein:

The step B further includes: the BSC issues a maintenance control command to the carrier frequency slot baseband processing unit, and the command parameter carries identification information of the corresponding TRAU unit to form a BSS The system is performing ground circuit detection in the maintenance state;

The TRAU frame described in step D may be identification information that carries a TRAU unit in an idle bit in a downlink operation and maintenance frame;

The step E further includes that the carrier frequency slot baseband processing unit judges whether the response TRAU frame is a TRAU frame sent by a TRAU unit corresponding to the detection circuit by using the identification information, and reports the carrier frequency to the BSC through the carrier frequency uplink maintenance channel. Ground circuit normal information between the gap baseband processing unit and the TRAU unit.

4. The detection method according to claim 3, characterized in that: the identification information of the TRAU unit can be delivered to the TRAU unit through the base station controller during network data configuration, or the TRAU unit can be automatically identified through the physical configuration location of the device .

5. The detection method according to claim 1, characterized in that: the timing time of the timer is at least twice as long as the unidirectional transmission time of the TRAU frame between the carrier frequency slot baseband processing unit and the TRAU unit.

6. The detection method according to claim 1, wherein:

Step B further includes: the control unit of the BSC sends a channel activation command to a carrier frequency slot baseband processing unit to form a BSS system to perform ground circuit detection in a running state,

The start timer described in step C is started when the carrier frequency slot baseband processing unit is assigned or switched to be activated.

7. The detection method according to claim 6, characterized in that: the timing time of the timer is at least longer than the round-trip time for transmitting TRAU frames between the baseband processing unit and the TRAU unit of the carrier frequency slot and the lag time for completing the connection between the two. In sum, the lag time is the time that the carrier frequency slot baseband processing unit and the TRAU unit indirectly continue to complete and lag behind the activation of the carrier frequency slot baseband processing unit.

8. The detection method according to claim 1, wherein: said connection The information includes at least detailed information on the resource occupation of the ground circuit between the carrier frequency slot baseband processing unit and the corresponding TRAU unit in the transmission, relay, and switching equipment.

9. The detection method according to claim 1, wherein the TRAU frame is a voice service frame, or a data service frame, or an operation and maintenance frame, or a large number of idle bits in the operation and maintenance frame carry a random sequence. And a frame ordinal sequence, or a combination of the aforementioned various frames and / or sequences.

10. A mobile communication base station subsystem (BSS) ground circuit detection method, characterized in that the method includes the following steps:

C) After the carrier frequency slot baseband processing unit receives the maintenance detection command, it continuously sends a normal or specific format operation and maintenance frame TRAU frame to the TRAU through the uplink ground circuit;

D) The TRAU unit is activated in-band or after receiving the uplink ground circuit maintenance detection command issued by the BSC via TRAU, it starts a timer;

E) Determine whether the TRAU unit receives a TRAU frame before the timer expires. If a TRAU frame can be received, it indicates that the uplink ground circuit is normal. If a TRAU frame cannot be received, it indicates that the uplink ground circuit is abnormal. TRAU uses the TRAU uplink maintenance channel. Report the test results to the BSC.

11. The detection method according to claim 10, wherein the method further comprises: clearing the timer, and the BSC reports the detection result to the maintenance station together with the resource occupation information of the processed ground circuit, and the maintenance station Platform for processing.

12. The detection method according to claim 10, wherein: the step B further comprises: the BSC sends a maintenance control command to a TRAU unit, wherein the command parameter carries identification information of a corresponding carrier frequency slot baseband processing unit, In order to form the BSS system, the upstream ground circuit is detected in the maintenance state;

The TRAU frame described in step D may be identification information of a baseband processing unit carrying a carrier frequency slot in an idle bit in an uplink operation and maintenance frame;

The step E further includes: the TRAU unit judges whether the TRAU frame is sent by the carrier frequency slot baseband processing unit corresponding to the detection circuit according to the identification information, and reports the carrier frequency slot baseband processing unit to the BSC through the TRAU uplink maintenance channel. Uplink ground circuit normal information between the TRAU unit and the unit.

13. The detection method according to claim 12, characterized in that: the identification information of the carrier frequency slot baseband processing unit can be delivered to the carrier frequency slot baseband processing unit by the base station controller during network data configuration, or The carrier frequency slot baseband processing unit is automatically identified by the physical configuration location of the device.

14. The detection method according to claim 10, wherein:

15. The detection method according to claim 10, further characterized in that the time of the timer is set to be more than twice the one-way transmission time of the operation maintenance frame or the normal maintenance frame in the uplink ground circuit.

16. The detection method according to claim 10, wherein: the connection information includes at least a ground between a carrier frequency slot baseband processing unit and a corresponding TRAU unit. Details of the circuit's resource occupation in transmission, relay, and transit equipment.

17. The detection method according to claim 10, wherein the TRAU frame is a voice service frame, or a data service frame, or an operation and maintenance frame, or a large number of idle bits in the operation and maintenance frame carry a random sequence. And a frame ordinal sequence, or a combination of the aforementioned various frames and / or sequences.

18. A mobile communication base station subsystem (BSS) ground circuit detection method, characterized in that the method includes at least the following steps:

B) Through the carrier frequency downlink maintenance channel between the carrier frequency slot baseband processing unit and the BSC, the BSC issues a channel activation or maintenance detection command to the carrier frequency slot baseband processing unit, and issues a maintenance detection command to the TRAU through the TRAU downlink maintenance channel ;

C) After the carrier frequency slot baseband processing unit is activated or receives a maintenance command, a certain timer is started;

19. The detection method according to claim 18, wherein the method further comprises: clearing the timer, and the BSC reports the detection result to the maintenance station together with the resource occupation information of the processed ground circuit, and the maintenance station For processing.

20. The detection method according to claim 18, wherein: The maintenance control command parameter issued by the BSC to the carrier frequency slot baseband processing unit in step B carries the identification information of the corresponding TRAU unit;

Said step E further comprises a baseband processing unit by the carrier frequency time slots to the identification information whether the frame is judged to be the subject ¹

21. The detection method according to claim 20, wherein the identification information of the TRAU unit can be delivered to the TRAU unit through a base station controller during network data configuration, or the TRAU unit can be automatically identified through the physical configuration location of the device .

22. The detection method according to claim 18, wherein: the timing time of the timer is at least twice as long as the unidirectional transmission time of the TRAU frame between the carrier frequency slot baseband processing unit and the TRAU unit.

23. The detection method according to claim 18, wherein: the connection information includes at least a ground circuit between a carrier frequency slot baseband processing unit and a corresponding TRAU unit in transmission, relay, and switching equipment. Resource usage details.

24. The detection method according to claim 18, wherein the TRAU frame is a voice service frame, or a data service frame, or an operation and maintenance frame, or a large number of idle bits in the operation and maintenance frame carry a random sequence. And a frame ordinal sequence, or a combination of the aforementioned various frames and / or sequences.