KR20010064443A - Communication signal transit apparatus of the mobile station center - Google Patents

Abstract

PURPOSE: A communication signal relay device in an MSC(Mobile Station Center) is provided to simply construct the MSC, and to simultaneously control a transmission speed adaptor and an LAPF(Link Access Procedure to Frame mode bearer services) protocol processor. CONSTITUTION: A transmission speed adaptor(2) adapts communication signals having each different transmission speed. An LAPF(Link Access Procedure to Frame mode bearer services) protocol processor(4) receives the communication signals, and processes the communication signals to be in accord with protocols. A controller simultaneously controls a transmission speed processor and the LAPF protocol processor(4). A sub highway line(8) divides the communication signals, and supplies the divided communication signals to subscribers. The first high level link controller(10) controls to transmit the communication signals transmitted from the sub highway line(8) to the controller(6) at a high speed. The second high level link controller(18) controls to transmit the communication signals transmitted from the transmission speed processor to the controller(6) at a high speed.

Description

Communications signal transit apparatus of the mobile station center

The present invention relates to a communication signal relay device at the switching center, and more particularly, to a communication signal relay device at the switching station that can speed up the transmission of the communication signal at the switching station and increase the processing capacity for the number of subscribers. .

A mobile station center (MSC) relays a communication signal of a mobile terminal between a control station (BSC) and a home location register (HLR), which is a fixed telephone network.

The mobile terminal is a mobile terminal using a code division multi-access (CDMA) technique, which is mainly digital.

The configuration of the conventional switching station is as shown in FIG. A rate adaptation unit 42 for adapting communication signals having different transmission rates to each other, and a link for receiving a communication signal transmitted from the transmission rate adaptation unit 42 and processing the communication signal to conform to a protocol It consisted of the connection protocol process part 44. FIG.

A first control means 48 is provided in the transmission rate adaptation section 42 to control the operation of the transmission rate adaptation section 42.

A second control means 50 is provided in the link connection protocol processor 44 to control the operation of the link connection protocol processor 44.

In the link connection protocol processing section 44, a second local memory 52 is provided to store data for communication signal processing in the link connection protocol processing section 44.

Conventionally, as shown in FIG. 1, two boards have the effect of adding two boards, where two blocks (transmission rate adaptation unit 42 and link connection protocol processing unit 44) are capable of bidirectional connection in order to communicate. (46) In both directions, data is communicated to an accessible memory.

Four sub-highway lines will accommodate a total of 120 subscribers, 30 subscribers for each sub-highway interface circuit. In this case, data is transmitted between the transmission rate adaptation unit 42 and the link connection protocol processing unit 44, which are two blocks. In this case, when the data switched in the time switch TS passes through the bi-directionally accessible RAM 46 and other buffers, a data relay occurs and a transmission rate is lowered.

As shown in FIG. 4, four sub-highway lines are matched to one E1 trunk line to handle 10 channels, that is, 40 subscribers, among the 30 E1 channels. However, if 40 or more subscribers simultaneously process the rate adaptation process and the link access protocol (LaPF) protocol (Layer2), a delay occurs through the bidirectional accessible RAM (DPRAM) and the buffer. . As a result, the data transfer rate is lowered. In addition, due to the limitation of the chip capacity, a buffer full phenomenon occurs in which all of the buffer storage capacity is used.

For example, for 8K wireless data services, the average data transfer rate for a single subscriber would be between 8000 and 8800 bps, but the data transfer rate for multiple subscribers would be further through the bi-directionally accessible RAM 46. This will inevitably have a lower speed.

Accordingly, the present invention has been made to solve the above problems, and an object of the present invention is to provide a communication signal relay apparatus at an exchange station that can speed up the transmission of communication signals at an exchange station and increase processing capacity for the number of subscribers. It is.

In order to achieve the above object, a communication signal relay apparatus in a switching center according to the present invention includes a transmission rate adaptation unit adapted to adapt communication signals having different transmission rates to each other, and a communication signal transmitted from the adaptation speed adaptation unit to receive a protocol. A link connection (LAPF) protocol processing unit for processing a communication signal to match, and a control means for controlling the transmission rate processing unit and the link connection protocol processing unit together, and the transmission rate adapting unit divides the communication signal to multiple subscribers and transmits it. And a first high level link controller for controlling a high speed transmission of the communication signal transmitted from the sub highway line to the control means, wherein the link connection protocol processing unit transmits the communication transmitted from the transmission speed processing unit. Signal to the control means The controlling to transmit to is characterized in that a high level consisting of two link controllers.

1 is a block diagram of a communication signal relay apparatus at a switching center according to the prior art;

2 is a block diagram of a communication signal relay apparatus at an exchange station according to an embodiment of the present invention;

3 is a configuration diagram of a communication signal input to a DPROM in a communication signal relay device at an exchange station according to an embodiment of the present invention;

4 is a configuration diagram of a SHW (sub highway) and an E1 TRUNK (trunk) as a communication interface circuit applied to a communication signal relay device in an exchange station according to an embodiment of the present invention;

FIG. 5 is a flowchart of an operation sequence executed through a UI-frame between the second layer, the third layer, and the IWF of FIG. 2 in the communication signal relay device at the switching center according to the date of the present invention.

Explanation of symbols on the main parts of the drawings

2, 42: transmission rate adaptation unit

4, 44: link connection protocol processing unit

6: control means 10: first high level link controller

18: second high level link controller

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in Fig. 2, the transmission rate adaptation section 2 is connected to a link connection protocol processing section described later to adapt communication signals having different transmission rates to each other in a mobile station center (MSC). That is, the transmission rate adaptation unit 2 matches or matches the two types of communication signals with each other when a difference between the speed of the communication signal transmitted from the switching station to the control station and the communication signal transmitted from the control station to the switching station occurs. It is installed in the switching center to serve to adapt.

A link access procedure to frame mode bearer services (LAPF) protocol processor 4 receives the communication signal transmitted from the adaptation rate adaptation unit 2 and adapts the transmission rate to process the communication signal to match the corresponding protocol. It is connected to the part 2.

The control means 6 is a central processing unit (CPU) connected to the transmission rate adaptation unit 2 and the link connection protocol processing unit 4 to control the transmission rate adaptation unit 2 and the link connection protocol processing unit 4. )to be.

The transmission rate adaptation unit 2 consists of a sub highway interface circuit 8, a first high level link controller 10, a shared memory 12 and a local memory 14.

Four sub-highway lines (SHW, sub-highway) are connected to the first high level link controller 10 to divide and transmit communication signals to a plurality of subscribers.

As shown in FIG. 4, each sub highway line is composed of 31 channels to simultaneously process communication signals transmitted from multiple subscribers.

A first high level data link control controller (HDLC Controller) 10 allows the sub highway interface circuit 8 to transmit a communication signal transmitted from the sub highway line to the control means 6 at high speed. Is connected to.

The shared memory 12 is connected to the control means 6 to store data for communication signal processing in the switching center.

The local memory 12 is connected to the control means 6 to store data for communication signal processing in the transmission rate adaptation unit 2.

The sub highway line is also connected to the time switch block TS to time-division the voice signal.

The link connection protocol processor 4 includes a second high level link controller 18, a trunk interface circuit (Trunk I / F) 20, a second shared memory 22, and a bidirectional access capable RAM (DPRAM, dual). port RAM, 24).

The second high level link controller 18 is connected to the trunk interface circuit 20 to transmit the communication signal transmitted from the trunk interface circuit 20 to the control means 6 at high speed.

The trunk line passes through the trunk interface circuit 20 to transmit a communication signal transmitted from a control station (BSC, base station center, not shown) to the control means 6 and the second high level link controller 18. The control means 6 and the second high level link controller 18 are connected.

The second shared memory 22 is connected to the control means 6 via a bus 26 to store data for communication signal processing in the switching center and data for communication signal processing in the link connection protocol processor 4. have.

The bidirectionally connectable RAM 24 is connected to the control means 6 via the bus 26 so as to temporarily store a communication signal transmitted and received between the control station and the home position register HLR.

The third layer interface circuit (Layer 3 I / F) 24 transmits and receives a communication signal between the third layer (Layer 3), which is a separate unit for processing a communication signal, and the bidirectionally connectable RAM 24. It is connected to the bidirectionally connectable RAM 24 via 26.

One (1 E1) said trunk line is also connected to said trunk interface circuit 20 to output a communication signal to a control station and a home position register.

As shown in FIG. 4, each sub highway line is composed of 31 channels to simultaneously process communication signals transmitted from multiple subscribers.

On the other hand, the configuration of the communication signal transmitted and received via the sub highway line is shown in FIG.

Assuming that the communication signal consists of 160 bytes, the first part of the communication signal is a 1 byte flag that identifies the data to other data, followed by a preamble of 3 bytes of data. .

Next is the message header of the 4-byte data. The next is 32 bytes of the encoding packet.

Next is an cyclic redunduncy check code (CRC) for retrieving the error portion of the data, consisting of two bytes.

The next one consists of one byte as a flag for identifying data.

Next is the idle flag, an empty space with no data, consisting of 117 bytes.

Next, the effect of the communication signal relay device in the switching center according to the embodiment of the present invention configured as described above will be described.

First, a process of receiving a communication signal from one of the control stations at the switching station and relaying the communication signal to the home location register, which is a fixed telephone network, will be described.

Wireless communication signals are input to the trunk line and trunk interface circuit 20 from the control station.

The communication signal from the trunk interface circuit 20 is then input via the bus 26 to the control means 6 and the second high level link controller 18.

A communication signal is then input to the control means 6 at high speed from the second high level link controller 18.

The control means 6 then processes the data to conform to the protocol.

A communication signal is then output from the control means 6 to the first high level link controller 10.

Next, the first high level link controller 10 transmits the communication signal to the time switch TS through the sub highway line at high speed.

The communication signal is then time-divided by the time switch TS.

A time-divided communication signal is then transmitted to the trunk via the sub highway line and the sub highway interface circuit 8, the first high level link controller 10, the bus 26 and the trunk interface circuit 20. .

Then, as shown in FIG. 4, the communication signals carried on the four sub highway lines 8 are transmitted to one trunk.

A wireless communication signal is then sent through the trunk to the home location register.

Next, a process of receiving a communication signal from a home location register at the switching center and relaying the communication signal to one of the control stations will be described.

First, a wireless communication signal is input from the home location register to the trunk line and trunk interface circuit 20.

The communication signal is then input from the trunk interface circuit 20 via the bus 26 to the control means 6 and the second high level link controller 18.

The control means 6 then processes the data to conform to the protocol.

A communication signal is then output from the control means 6 to the first high level link controller 10.

Next, the first high level link controller 10 transmits the communication signal to the time switch TS through the sub highway interface circuit 8 and the sub highway line at high speed.

The communication signal is then time-divided by the time switch TS.

A time-divided communication signal is then transmitted to the trunk via the sub highway line, the sub highway interface circuit 8, the first high level link controller 10, the bus 26 and the trunk interface circuit 20. .

Then, as shown in FIG. 4, communication signals carried on four sub highway lines are transmitted to one trunk.

Subsequently, a wireless communication signal is transmitted through the trunk to one of the control stations.

The control means 6 is connected between the transmission rate adaptation part 2 and the link connection protocol processing part 4 via the bus 26 during the relaying of such communication signals, and the one control means 6 is connected. By this, the operation of the transmission rate adaptation unit 2 and the link connection protocol processing unit 4 are simultaneously controlled, so that the relay of the communication signal is executed quickly.

It also quickly processes communication signals sent from multiple subscribers.

Meanwhile, as shown in FIG. 5, data is transmitted between the second layer (Layer 2), the third layer, and the IWF (inter-working function) not shown in FIG. 2 by the operation sequence through the UI-frame. .

As described above, according to the communication signal relay device at the switching center according to the present invention, the configuration cost can be reduced at the time of configuring the switching station by simply configuring the switching station.

In addition, a plurality of communication signals can be processed simultaneously by controlling the transmission rate adapting section and the link connection protocol processing section simultaneously by one control means. Thus, it is possible to secure a large number of subscribers, thereby increasing the processing capacity of the switching center capable of processing and relaying communication signals transmitted from many subscribers.

In addition, it is possible to increase the transmission speed of the communication signal by simultaneously controlling the transmission speed adapting section and the link connection protocol processing section by one control means.

On the other hand, by simplifying the configuration of the switching center, it is possible to save time and cost for developing and testing the switching center for realizing a high data transfer speed in the future.

Further, according to the communication signal relay apparatus at the switching center according to the present invention, the movement of data in the switching station can be performed quickly by simplifying the buffer structure in the switching port.

Claims (2)

A transmission rate adaptation unit adapted to adapt communication signals having different transmission rates to each other, A link connection (LAPF) protocol processing unit for receiving a communication signal transmitted from the adaptive speed adaptation unit and processing the communication signal to conform to a protocol; Control means for controlling the transmission rate processor and the link connection protocol processor together; The transmission rate adaptation unit and the sub-highway line for transmitting a communication signal divided into a plurality of subscribers; A first high level link controller which controls to transmit the communication signal transmitted from said sub highway line to said control means at high speed, And said link connection protocol processing section comprises a second high level link controller for controlling the communication signal transmitted from said transmission speed processing section to be transmitted at high speed to said control means. The switching center of claim 1, wherein the transmission rate adaptation unit and the link connection protocol processing unit are connected to each other through the control means, the sub highway line and the trunk line without going through a bidirectional connection RAM (DPRAM). Communication signal relay device.