KR100624195B1 - Mobile Communication System and data processing method in the vocoder of BSC for serving Packet Data Transmission mobile to mobile - Google Patents

Abstract

The present invention provides a mobile communication system for providing a packet service between mobile terminals for supporting a packet call connection service between a mobile station operating in a packet mode without using a packet data serving node (PDSN) and data of a vocoder in the base station controller. A method of processing comprising: an HDLC processor for controlling a signal processing path by determining whether an input signal is a voice call or packet data by a vocoder in a base station controller, and performing an ISLP protocol processing and time division multiplexing on the input packet data. And one or more digital signal processing processors (DSPs) for decoding the input compressed voice data into pulse code modulation (PCM) data and transmitting the received pulse code modulation (PCM) data to the base station. And output from the digital signal processing processor (DSP). Including the time division multiplexed audio signal processing and a switch for the switching and outputting a time-division multiplexing the packet data processing signals from the HDLC processing unit which is characterized in that configuration.

According to the present invention, the existing base station controller (BSC) -mobile switching center (MSC) infrastructure is slightly improved to enable the service of mobile to mobile packet calls as well as to provide simultaneous services of voice and packet calls.

Description

A mobile communication system for providing packet service between mobile terminals and a data processing method of a vocoder in a base station controller {mobile communication system and data processing method in the vocoder of BSC for serving packet data transmission mobile to mobile}             

1 is a block diagram of a typical IS-95A / B system.

2 is a block diagram of a conventional IS-95C system.

3 is a block diagram of an IS-95C system according to the present invention;

4 is a block diagram of a vocoder provided in the base station controller shown in FIG.

5 is a flowchart of data processing in a vocoder according to the present invention.

* Explanation of symbols for main parts of the drawings

110: portable wireless telephone 120, 130: wireless communication terminal

140: video communication telephone 210-240: base station

300a, 300b: base station controller 400: mobile switching center

410: voice mail server 420: home location register / authentication device

510: billing system 520: interlocking device (IWF)

530: DCN 531: AAA                 

532: home agent (HA) 533: O & M

540: Internet 550: terminal for video communication

560: PSTN / PLMN 570: IS-95A / B Network

The present invention relates to a vocoder and a mobile communication system for providing a packet service between mobile terminals, and in particular, to improve the structure of an IS-95A / B system, a packet between mobile terminals capable of supporting communication between mobile terminals for voice communication and video communication. A mobile communication system for providing a service, and a data processing method of a vocoder in a base station controller.

1 is a block diagram of a general IS-95A / B system. Referring to Fig. 1, packet data originating signals from communication terminals 10 and 20 are transmitted to mobile switching center 40 through base stations 31 and 32 and base station controller 33 so that a user can access the Internet 70. And can be connected to the Internet 70 because an internet matching function (hardware and protocol) is provided between the mobile switching center 40 and the network interlocking device (IWF) 50.

Network components for this access service, i.e., voicemail server 42, home location register / authentication device (HLR, VLR) for subscriber mobility management, etc., are all matched to the mobile switch 40.                         

On the other hand, in order to provide a faster data service than the existing IS-95A / B service, the standardization (3GPP2) for the IS-95C system as shown in Figure 2 is in progress. 2, the IS-95A shown in FIG. 1 in addition to a method of constructing a completely new system separately from the existing system consisting of the base stations 21-24, the base station controllers 26 and 27, the mobile switching center 40, and the like. Several operators are also working on system configurations that can be used for all but the base station modem channel blocks that require modification in the / B system.

A network element called a packet data serving node (PDSN) 30, which is directly matched by the base stations 21-24 and the base station controllers 26 and 27, which accommodates the 3G modem channel shown in FIG. 2, has been added. In FIG. 2, the packet service origination for the Internet 70 connection is performed after the signaling processing (except authentication and other services) at the mobile switching center 40 is performed as in the existing IS-95A / B system. Rather than through the switching center 40-network interlocker 50, the base station controllers 26 and 27 are matched to an integrated packet data serving node (PDSN) 30.

Although the network interlocking device 50 having a function similar to that of the packet data serving node (PDSN) 30 is provided in the IS-95A / B system in FIG. 1, the packet data serving node in the IS-95C system shown in FIG. The reason why the (PDSN) 30 is used is that it is difficult for the mobile switching center 40 to process packet data at high speed under the IS-95A / B system environment shown in FIG.

However, even if the new packet data serving node (PDSN) 30 is newly constructed and the packet traffic is directly transmitted from the base station controllers 26 and 27 to the packet data serving node (PDSN) 30, the packet data serving node (PDSN) 30 may be existing in the existing IS-95A / B system. In the case of accessing the mobile terminal for IS-95A / B, since the service thereof must be provided under the same conditions as the existing IS-95A / B network connection, the existing mobile switching center 40-network interlocking device 50 matching method And network interlock systems are difficult to exclude immediately.

Meanwhile, when the communication system shown in FIGS. 1 and 2 supports a video service in a packet mode like the H.323 support terminal 14, multimedia data such as a video is directly transmitted from the H.323 wireless terminal 14. Mode can be connected to the H.323 support video device (notebook in Figure 2 of the present invention) 71 connected to the wired Internet 70 through the packet data serving node (PDSN) 30 to receive the corresponding service. have.

In this case, the packet-to-mobile call is a call originating from the wireless terminal 14 reaches a subscriber connected to the wired Internet 70.

In the case of a mobile to mobile packet call, that is, when the H.323M wireless terminal 14 is called, a service providing method and a connection method are not yet standardized. A proposal is expected.

An object of the present invention is to solve the above-mentioned problems of the prior art and to meet the same industry's expectations, and provides a packet-to-mobile packet operation without a packet data serving node (PDSN). A mobile communication system for providing a packet service between mobile terminals for supporting a call connection service, and a data processing method of a vocoder in a base station controller.

A mobile communication system for providing a packet service between mobile terminals of the present invention for achieving the above object is a vocoder in a base station controller having a digital signal processing processor for processing a voice call, whether the input signal is a voice call or packet data. The HDLC processing unit to control the signal processing path by determining the time-sensitive signal, and to perform time division multiplexing by processing the ISLP protocol on the input packet data with the ISLP protocol, and to decode the compressed speech data into pulse code modulation (PCM) data. One or more digital signal processing processors (DSPs) for transmitting to the base station or encoding input pulse code modulation (PCM) data to a base station, and time division multiplexed speech processing signals output from the digital signal processing processors (DSPs); Time division multiplexed packet data processing from the HDLC processor And a switch for switching and outputting the re-signal.

A data processing method of a vocoder in a base station controller of a mobile communication system for providing a packet service between mobile terminals configured as described above is used to determine whether an input signal is voice call or packet call data when processing a voice call or packet data in a vocoder in a base station controller. A call classification process for selecting a signal processing path and decoding input compressed voice data into pulse code modulation (PCM) data and transmitting the result to a mobile switching center, or encoding input pulse code modulation (PCM) data for a base station. A voice signal processing process delivered to the network, a packet data processing process performing ISLP protocol processing on the input packet data, a voice processing signal output through the voice signal processing process, and a packet service output through the packet data processing process Time Division Multiplexing of Data Processing Signals And a time division multiplexing processing process for outputting open.

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

3 is a block diagram of an IS-95C system according to the present invention. Referring to Figure 3, the IS-95C system of the present invention includes a plurality of base stations (210-240); If the input signal is packet data, and performs the time-splitting multiplexing after executing the ISLP protocol processing between the base station controller and the mobile switching station for data service, and if the input signal is compressed voice data. Base station controllers 300a and 300b for decoding and outputting pulse code modulation (PCM) data or encoding and outputting input pulse code modulation (PCM) data; A mobile switching center (400) for switching and controlling the path of voice calls or packet data originating from the base station controllers (300a, 300b) or for switching and controlling the path of voice calls or packet data for the base station in its area; A voice mail server 410 and a home location register / authentication device 420 that match the mobile switching center 400; A billing system 510 that is matched with the mobile switching center 400 and that calculates and charges a fee for each subscriber; A network interlocking device 520 for interworking the mobile switching center 400 with another network; DCN 530 is connected to the network linkage device 520.

Here, the base station controller (300a, 300b) is provided with one or more vocoder, each vocoder 310 controls the signal processing path by determining whether the input signal is voice call or packet data, as shown in Figure 4, ISLP A protocol-equipped processor (ICP) 311 that performs HDLP control by ISLP protocol processing on input packet data, and decodes the compressed speech data into pulse code modulation (PCM) data to a mobile switching center. One or more digital signal processing processors (DSPs) 312a and 312n for transmitting or encoding input pulse code modulation (PCM) data to the base station and output from the digital signal processing processors (DSPs) 312a and 312n. And a switch 313 for time division multiplexing the voice processing signal and the packet data processing signal output from the central processing unit 311.

In one embodiment, as shown in the figure, whether the input signal is a voice call or packet data is determined to control a signal processing path, and when the input signal is packet data with the ISLP protocol, the ISLP between the base station controller and the mobile switching center for data service. A core 311a of a central processing unit (CPU) for executing protocol processing and an HDLC controller 311b for time division multiplexing the ISLP protocol processed packet data as one HDLC central processing unit (CPU) 311 ).

However, the CPU may play only the role of the core 311a shown and the HDLC controller 311b may be implemented separately from the CPU.

The difference between FIG. 3 and the conventional FIG. 2 according to the present invention is that in the existing IS-95A / B system shown in FIG. 1 without additionally adding a packet data serving node (PDSN) in the base station controller (BSC) 300a and 300b. Home Agent function and external agent to support IP address allocation for mobile terminal for mobile to land calling in the network interworking device function used (for simple IP or mobile IP support) (Foreign Agent) function is provided. Therefore, the overall system construction cost can be reduced, which can be easily applied as a similar functional element.

Therefore, when configuring the system as shown in FIG. 3, the transmission of data between the base station controller (BSC) 300a, 300b-the mobile switching center (MSC) 400 is only through the time division multiplexing function for transmitting the original voice information. In the embodiment of the present invention, as shown in FIG. 4, the vocoder 310 in the base station controller (BSC) 300a and 300b may be improved to transmit packet data through a time division multiplexing path.

Accordingly, when the communication system is configured as shown in FIG. 3 and the vocoder is configured as shown in FIG. 4, mobile to land or mobile to mobile packet data can be transferred through the mobile switching center 400. Therefore, in case of accessing the IP network, the packet mode data exits the packet data serving node (PDSN) from each base station controller (BSC) 300a, 300b, and then the terminal for wired packet data service is routed by routing of the Internet 540. Rather than visiting, the mobile station first passes the message directly to the mobile switching center where the terminal exists, particularly through the path of the mobile switching center 400-other mobile switching center or mobile switching center 400-packet data serving node (PDSN). In the case of data (incoming call), the service can be easily supported. In other words, it supports call exchange using the switching function inherent in the mobile exchange.

On the other hand, in such a configuration, the transfer of mobile to mobile packet data is not directly via the Internet 540, but the elements such as the vocoder 310 and the mobile switching center 400 provided in the system for the existing voice call are packet data. In this case, the capacity and the necessity of various network devices for internet matching can be reduced, and the initial investment can be greatly reduced.

In addition to the progress of existing standardization schemes, the existing communication system can be improved to reduce the delay of data transmission (reduced occurrence of echo, delivered directly through a much more stable switching network than IP). It can provide the service of incoming / outgoing call between Mobile to mobile H.323 video terminals that can satisfy enough).

The vocoder 310 shown in FIG. 4 is an apparatus for connecting data transmitted from a mobile terminal to a wired terminal through the mobile switching center 400, and also provides an echo canceling function. The vocoder according to the present invention is provided with ISLP (as defined in IS-728), which is a BSC-MSC concatenation protocol for existing IS-95B data services when the input signal is packet data rather than voice calls.

On the other hand, the transmitted data uses H / W (HDLC controller 311b) that can support the target speed of IS-95C (up to 384 Kbps level). Also, it is used as a central processing unit (CPU) in the current trend. Since the processor chip tends to be one-chip, it can easily support H / W without adding external devices and glue logic.

As shown in FIG. 4, when a voice call is transmitted through a vocoder, the CPU 311 may generate a PCM (generated through a digital signal processing processor (DSP) 312a-312n, similarly to a conventional voice call processing. Pulse Code Modulation) data is transmitted to the mobile switching center 400 through the switch 313, or performs the reverse operation, and in the case of packet mode service data, to the digital signal processing processor (DSP) 312a-312n. After the ISLP protocol processing is performed instead of forwarding, time division multiplexing is performed through the HDLC controller 311b provided therein, and then forwarded to the switch 313.

The central processing unit (CPU) 311 is a voice call and a packet data call in one terminal except for a case where a voice call and a packet data call are mutually exclusive (i.e., a voice call does not carry a packet call or vice versa). If you need to connect all of them, you can also provide a concurrent service (one of the IS-95C's service options).

The data processing method in the vocoder installed in the base station controller according to the present invention described above will be described below with reference to FIG.

First, a core classification process for selecting a signal processing path is performed by determining whether the input signal is voice call or packet call data in the core 311a of the central processing unit with respect to the input signal (S1).

Then, when the input signal is a voice signal, the compressed voice data is decoded into pulse code modulation (PCM) data by the digital signal processing processors 312a and 312n and transmitted to the mobile switching center, or an input pulse code modulation ( A voice signal processing process is performed to encode the PCM data and deliver the data to the base station (S2).

On the other hand, if the input signal is packet data, the HDLC controller 311b performs a packet data processing process for performing ISLP protocol processing and time division multiplexing on the input packet data (S3).

In this manner, the time division multiplexing process of switching and outputting the time division multiplexed speech processing signal output through the voice signal processing process and the time division multiplexed packet service data processing signal output through the packet data processing process is performed by switching (313). S4). In Fig. 4, reference numerals 314 and 315 denote processing flows of voice signals and processing flows of packet data, respectively.

As described above, according to the present invention, the existing base station controller (BSC) -mobile switching center (MSC) infrastructure of the service network of the existing IS-95A / B is slightly improved to improve the service of the IS-95C-wide service, in particular, H.323M (14). Not only can mobile to mobile packet call service be provided between video terminals, but also voice and packet call can be provided simultaneously.

In addition, since the elements such as the vocoder and the mobile switching center provided in the system for the existing voice call can be utilized in the case of the packet data call, the capacity and initial investment cost of various network devices for internet matching can be greatly reduced.

Claims (4)

A HDLC processor which controls a signal processing path by determining whether an input signal is voice call or packet data, and is equipped with an ISLP protocol and performs time division multiplexing by processing ISLP protocol on input packet data; At least one digital signal processing processor (DSP) that decodes the inputted speech data into pulse code modulation (PCM) data and transmits it to a mobile switching center, or encodes and inputs input pulse code modulation (PCM) data to a base station; And a switch for switching the time division multiplexed speech processing signal output from the digital signal processing processor (DSP) and the time division multiplexed packet data processing signal from the HDLC processor. A mobile communication system for providing a packet service between mobile terminals, comprising a vocoder in a base station controller. The method of claim 1, wherein the HDLC processing unit, Determining whether the input signal is a voice call or packet data to control the signal processing path; and when the input signal is packet data with the ISLP protocol, the central processing unit that executes ISLP protocol processing between the base station controller and the mobile switching center for data service. (CPU), And a HDLC controller configured to time-division multiplex the ISLP protocol processed packet data in the central processing unit. The mobile switching center of claim 1, Switching control of the traffic data of the voice call originating from the digital signal processing processor of the vocoder provided in the base station controller or the packet call originating from the HDLC processing unit, or the voice call or packet data having the base station in its area as the called party. The mobile communication system for providing a packet service between the mobile terminal, characterized in that configured to control the switching of the path. A call classification process for determining a signal processing path by determining whether the input signal is voice call or packet call data by the HDLC processor; In the digital signal processing processor (DSP), the decoded compressed voice data is decoded into pulse code modulation (PCM) data and transmitted to the mobile switching center, or the inputted voice code modulation (PCM) data is encoded and transmitted to the base station. Treatment process, A packet data processing process for performing ISLP protocol processing in the CPU and time-division multiplexing in the HDLC controller with respect to the input packet data; And a time division switching process for switching and outputting the time division multiplexed speech processing signal output through the voice signal processing process and the time division multiplexed packet service data processing signal output through the packet data processing process. A data processing method of a vocoder in a base station controller of a mobile communication system for providing a periodic packet service.

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