KR100834639B1 - Method of Time Synchronization of Downlink User Plane - Google Patents

Abstract

The present invention allows the downlink user plane synchronization decision on the IMT-2000 system Iub frame protocol to be made as soon as possible, so that the downlink frame on the Iub is discarded because the downlink plane synchronization is not achieved at the base station. The present invention relates to a method for determining downlink user plane synchronization for minimizing the number of signals to prevent signaling delay and call disconnection.

According to the present invention, there is provided a method comprising receiving a downlink data frame, determining whether the received downlink data frame has been received before a LTOA (Last Time of Arrival), and when the data frame is received before an LTOA. It characterized in that it comprises a step comprising determining that the synchronization has been established. According to the above configuration, it is possible to minimize the number of downlink frames on the Iub that are discarded because downlink plane synchronization is not achieved at the base station by making downlink user plane synchronization determination as soon as possible. There is an advantage to that.

Description

Method of determining downlink user plane synchronization {Method of Time Synchronization of Downlink User Plane}

1 is a schematic block diagram of a general IMT-2000 system;

2 is a flowchart for downlink user plane synchronization determination according to an embodiment of the present invention.

3 is a flowchart for downlink user plane synchronization determination according to another embodiment of the present invention.

     Explanation of symbols on the main parts of the drawings

100; Wireless operating device 110; Base station controller

120; Base station

The present invention relates to a mobile communication IMT-2000 system, and more particularly, to downlink user plane synchronization on the IMT-2000 system Iub frame protocol as soon as possible, thereby making the downlink platform at the base station The present invention relates to a method for determining downlink user plane synchronization for minimizing the number of downlink frames on an Iub that are not achieved due to in-synchronization to prevent signaling delay and call truncation.

In general, a mobile communication system is a communication system that targets mobile devices such as people, cars, ships, trains, and airplanes, which includes key phone systems, mobile phones (mobile phones, vehicle phones), port phones, aircraft phones, and mobile phones. Trains, cruise ships, express buses), radio calling, radiotelephony, satellite mobile communication, amateur radio, and fishing service ships.

Such mobile communication systems include an AMPS (Advanced Mobile Phone Service) system using an analog method, a Code Division Multiple Access (CDMA) system using a digital method, and a Time Division Multiple Access (TDMA) system. , FDMA (Frequency Division Multiple Access) system, WLL (Wireless Local Loop), CDMA2000-1x, IMT2000 system.

The IMT-2000 system is divided into a synchronization method centering on Europe and Japan and an asynchronous method centering on the United States, where the asynchronous system does not require synchronization between base stations using a Global Positioning System (GPS). It is distinguished from synchronous in that respect. Asynchronous is continuously being standardized through the 3rd Generation Partnership Project (3GPP).

The asynchronous IMT-2000 system uses the DS_MAP (Direct Sequence Mobile Application Protocol), which has the advantage of high frequency efficiency and global roaming.                         

Next, a device configuration of a general IMT-2000 system will be described.

The asynchronous IMT-2000 system is composed of a wireless operation apparatus 100, a base station controller 110, a plurality of base stations 120 and a mobile radio station (not shown). The wireless operation apparatus 100 is connected to the base station controller 110 through the Iu interface. The wireless operation apparatus 100 includes a circuit switched network (not shown), which is an area for processing voice call-based bearer connection and signal, and a packet switched network (not shown), which is an area for processing packet call-based bearer connection and signal.

The base station controller 110 supports soft handover and radio resource management algorithms, and uses the same interface for the circuit switched and packet switched domain connection of the radio operating apparatus 100 and the circuit switched and packet switched to the air interface protocol stack. Perform data processing functions. The base station controller 110 is connected to a plurality of base stations 120 via an Iub interface.

The base station 120 is connected to a mobile radio station (not shown) via a Uu interface. The mobile station (not shown) has subscriber identification, authentication algorithm implementation, authentication and password storage, and subscriber information.

The following describes the IMT-2000 Iub frame protocol downlink user plane synchronization determination method according to the prior art.

The prior art Iub frame protocol downlink user plane synchronization determination determines that the transport bearer is synchronized only when the downlink data frame is received before the LTOA (Last Time of Arrival) for a particular transport bearer. do.

Then, it is determined that the downlink user plane is synchronized only when all transport bearers set up with the synchronized transport bearer are synchronized.

However, the above-described downlink user plane synchronization determination method according to the prior art raises the following problems.

That is, downlink user plane synchronization determination is possible only when the base station controller 110 transmits downlink data frames for all transport bearers set up together according to the related art.

That is, the synchronization determination time is determined by the last transport bearer in which the downlink data frame transmitted from the base station controller 110 to the base station 120 occurs, and the other transport bearer previously received by the base station 120. There is a problem that the downlink data frame is discarded in the base station 120.

For a general call, for example, a signaling transport bearer for transmitting and receiving a message for signaling control and a PS packet signaling transport bearer for transmitting and receiving a message for packet data are set up with two transport bearers. For a call, if the PS traffic transport bearer occurred 10 seconds after the call setup, then 10 seconds later or downlink user plane synchronization determination is possible, thus discarding the downlink data frame of the signaling transport bearer.                         

Discarding the downlink data frame of the signaling transport bearer as described above causes serious delays in signaling of the base station controller or problems of call disconnection.

In addition, in the case of handover, the downlink data frame received by the base station controller 110 is discarded until downlink user plane synchronization of the added target is not performed, thereby obtaining a handover diversity gain. Also occurs.

The present invention was created to solve the above problems of the prior art, and an object of the method for determining downlink user plane synchronization according to the present invention is a downlink user plane on an IMT-2000 system Iub frame protocol (Frame Portocol). User Plane) IMT-2000 system Iub frames that can prevent signaling delays and call truncation by minimizing the number of downlink frames on the Iub that are discarded because downlink plane synchronization is not achieved at the base station by making synchronization decisions as soon as possible. A method for determining downlink user plane synchronization on a protocol is provided.

Another object of the method for determining downlink user plane synchronization on the IMT-2000 system Iub frame protocol according to the present invention is to determine downlink user plane synchronization on the IMT-2000 system Iub frame protocol as much as possible. In order to speed up, the present invention provides a method for determining downlink user plane synchronization on an IMT-2000 system Iub frame protocol that can smoothly obtain handover diversity gain.

A method for determining downlink user plane synchronization on an IMT-2000 system Iub frame protocol according to the present invention for achieving the above object includes: receiving a downlink data frame by a base station; Determining, by the base station, whether the received downlink data frame has arrived between a Time of Arrival Window Startpoint (TOAWS) and a Last Time of Arrival (LTOA); If the downlink data frame is not received before the LTOA after TOAWS, the received frame is discarded. When the downlink data frame is received before the LTOA after TOAWS, synchronization of the downlink user plane of the terminal is achieved. Determining whether it has been done; If the synchronization of the downlink user plane of the terminal is achieved, the received downlink data frame is transmitted to the terminal; if the synchronization of the downlink user plane of the terminal is not achieved, the downlink data frame is received. Determining whether synchronization of the transport bearer has been achieved; If synchronization of the transport bearer in which the downlink data frame is received is achieved, discarding the received frame, and in case the synchronization of the transport bearer in which the downlink data frame is received is not achieved, synchronization of all transport bearers is achieved. Determining whether or not; If the synchronization of all the transport bearers is not achieved, the received frame is discarded, and if the synchronization of all the transport bearers is achieved, the downlink user plane synchronization of the terminal is regarded as achieved and the received downlink data is achieved. And transmitting the frame to the terminal.

The downlink user plane synchronization determination method according to the present invention is characterized in that the downlink data frame includes a downlink synchronization message.

A method for determining downlink user plane synchronization according to the present invention includes: receiving, by a base station, a downlink synchronization message; Determining, by the base station, whether the received downlink synchronization message has arrived between a Time of Arrival Window Startpoint (TOAWS) and a Last Time of Arrival (LTOA); If the downlink synchronization message is not received before LTOA after TOAWS, the received message is discarded, and if the downlink synchronization message is received before LTOA after TOAWS, synchronization of the downlink user plane of the terminal is achieved. Determining whether it has been done; When the synchronization of the downlink user plane of the terminal is achieved, the received downlink synchronization message is transmitted to the terminal; when the synchronization of the downlink user plane of the terminal is not achieved, the downlink data frame is received. Determining whether synchronization of the transport bearer has been achieved; If synchronization of the transport bearer in which the downlink synchronization message was received is achieved, discard the received message; and in case the synchronization of the transport bearer in which the downlink synchronization message was received is not achieved, synchronization of all transport bearers is achieved. Determining whether or not; If the synchronization of all the transport bearers is not achieved, the received message is discarded, and if the synchronization of all the transport bearers is achieved, the downlink user plane synchronization of the terminal is regarded as achieved and the received downlink synchronization is achieved. And transmitting a message to the terminal.
According to the above configuration, by making the downlink user plane synchronization decision on the IMT-2000 system Iub frame protocol as soon as possible, the Iub discarded because the downlink plane synchronization is not achieved at the base station. There is an advantage in that the number of downlink frames on the frame can be minimized to prevent signaling delay and call truncation.

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Next, a preferred embodiment of the present invention downlink user plane synchronization determination method will be described in detail with reference to the accompanying drawings.

2 is a flowchart for downlink user plane synchronization determination according to an embodiment of the present invention, and FIG. 3 is a flowchart for downlink user plane synchronization determination according to another embodiment of the present invention.

First, a downlink data frame is received in a frame reception waiting state (operation 210). The base station 120 measures downlink data frame reception time of the received Iub user plane (step 212).

After the downlink data frame reception time measurement, the Iub at the time of Arrival Window Startpoint (hereinafter referred to as TOAWS) of the window in which the received downlink data frame should receive the Iub user plane downlink data frame. It is determined whether the user plane arrives between downlink data frame reception times (step 214).

As a result of the determination in step 214, when data is received before LTOA after TOAWS, it is determined whether downlink user plane synchronization of the corresponding terminal is achieved (216), and synchronization of the downlink user plane of the corresponding terminal is not achieved. If not, it is determined whether synchronization of the transport bearer in which the frame was received (step 218).

As a result of the determination in step 218, it is determined whether the synchronization of all the transports has been achieved only when the synchronization of the received transport bearers has not been achieved (step 220). The downlink user plane synchronization is considered to have been achieved (step 222).

If downlink user plane synchronization is achieved, it is transmitted to the terminal (step 224).

The following describes a method of synchronizing by receiving a downlink synchronization message.

First, in operation 310, a downlink synchronization message is received in a frame reception waiting state.

After receiving the data in step 310, the ToA is measured (step 312), and it is determined whether the received data is received before the LTOA after the ToA (step 314).

As a result of the determination in step 314, if it is received after the ToA but before the LTOA, the synchronization determination is performed on the corresponding transport bearer (step 316).

The above embodiments of the present invention are merely one embodiment of the technical idea of the present invention, and of course, other modifications are possible within the technical idea of the present invention.

In the IMT-2000 system having the configuration and operation described above, the method for determining downlink user plane synchronization on the Iub frame protocol has the following effects.

First, by making the downlink user plane synchronization decision on the IMT-2000 system Iub frame protocol as soon as possible, the downlink plane synchronization on the Iub is discarded because the downlink plane synchronization is not achieved at the base station. Minimizing the number has the effect of preventing signaling delay and call disconnection.

Second, by making the downlink user plane synchronization decision on the IMT-2000 system Iub frame protocol as soon as possible, the handover diversity gain can be smoothly obtained.

Claims (2)

In the downlink user plane synchronization determination method on the IMT-2000 system Iub frame protocol, The base station receiving a downlink data frame; Measuring, by the base station, a reception time of the received downlink data frame; Determining whether the downlink data frame arrives between a Time of Arrival Window Startpoint (TOAWS) and a Last Time of Arrival (LTOA); If the downlink data frame is not received before the LTOA after TOAWS, the received frame is discarded. When the downlink data frame is received before the LTOA after TOAWS, synchronization of the downlink user plane of the terminal is achieved. Determining whether it has been done; If the synchronization of the downlink user plane of the terminal is achieved, the received downlink data frame is transmitted to the terminal; if the synchronization of the downlink user plane of the terminal is not achieved, the downlink data frame is received. Determining whether synchronization of the transport bearer has been achieved; If synchronization of the transport bearer in which the downlink data frame is received is achieved, discarding the received frame, and in case the synchronization of the transport bearer in which the downlink data frame is received is not achieved, synchronization of all transport bearers is achieved. Determining whether or not; And Discarding the received frame if synchronization of all the transport bearers has not been achieved, and transmitting a downlink data frame of the terminal to the terminal if synchronization of all the transport bearers has been achieved. How to determine plane synchronization. The method of claim 1, And said downlink data frame comprises a downlink synchronization message.

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