KR100810590B1 - Mobile communication system and control device - Google Patents

Abstract

The present invention solves the problems of the conventional multicast communication system, and improves the reception quality and effective use of radio resources in the mobile station. The present invention relates to a mobile communication system for transmitting the same information to a plurality of cells through one or a plurality of base stations, and for maximum ratio synthesis or selective synthesis of the same information received by the mobile station. The mobile communication system according to the present invention includes a control unit for setting a period for performing transmission timing synchronization processing or the precision of the transmission timing synchronization processing for each control device that performs transmission timing synchronization processing of the same information between a plurality of cells. Equipped.

Description

Mobile communication system and control device {MOBILE COMMUNICATION SYSTEM AND CONTROL DEVICE}

The present invention transmits the same information to a plurality of cells through one or a plurality of base stations, and the mobile communication system (maximum ratio combining or selection combining) the same information received by the mobile station (multicast) Communication system) and a control device.

In a conventional mobile communication system, a "UL / DL Node Synchronization" function is known as a technique for measuring transmission delay (uplink and downlink) between a radio controller and a base station.

Referring to Fig. 1, this "UL / DL Node Synchronization" function will be described.

As shown in Fig. 1, the radio control apparatus firstly transmits the node synchronization signal for the downlink to the base station at the transmission time T1 when the base station managing each cell is activated or resumed. Send. Here, the information on the transmission time T1 is included in the node synchronization signal for the downlink.

Secondly, the base station receives the node synchronization signal for the downlink at the reception time T2. In other words, the node synchronization signal for the downlink reaches the base station from the radio controller after the transmission delay (T2-Tl) time.

Thirdly, at the transmission time T3, the base station transmits a node synchronization signal for the uplink including information about the reception time T2 and the transmission time T3 to the radio controller.

Fourthly, the radio controller measures transmission delays (uplink and downlink) between the radio controller and the base station based on the times Tl, T2, T3, and T4.

In the " UL / DL Node Synchronization " function in the conventional mobile communication system, the radio controller and the base station are configured to repeat the above-described processing at regular intervals.

In general, in a multicast communication system, there may be cases where the mobile station can or cannot perform maximum ratio synthesis or selective synthesis, depending on the transmission timing difference of the same information between a plurality of cells.

However, in the conventional mobile communication system, since the radio controller is configured to control the transmission timing by measuring the transmission delay between the radio controller and the base station, when performing multicast communication as described above, a plurality of cells are used. There is a problem that the difference in the transmission timing of the same information between them becomes large, and the case where the maximum ratio synthesis or the selective synthesis cannot be performed by the mobile station is likely to occur.

(Reference 1) 3GPP TS25.402 V5.1.0 Synchronization in UTRAN Stage2 2006

Accordingly, the present invention has been made in view of the above cases, and solves the above-mentioned problems when performing multicast communication by a conventional mobile communication system, thereby improving reception quality at a mobile station and effectively using radio resources. It is an object of the present invention to provide a mobile communication system capable of achieving an effect.

A first feature of the present invention is a mobile communication system (multicast communication system) for transmitting the same information to a plurality of cells through one or a plurality of base stations, and for maximum ratio synthesis or selective synthesis of the same information received by the mobile station, It is a main point to provide a transmission timing synchronization control part which sets the period which performs transmission timing synchronization processing or the precision of transmission timing synchronization processing for every control apparatus which performs transmission timing synchronization processing of the same information between a some cell.

According to the present invention, for each control device (core network device, radio control device, base station) that performs transmission timing synchronization processing, the period of performing the transmission timing synchronization processing or the precision of the transmission timing synchronization processing is set, so that the plurality of cells can be controlled. The transmission timing difference can be adjusted, and the mobile station can have an effect of improving reception quality of the mobile station and effective use of radio resources.

According to a first aspect of the present invention, there is provided a base station for managing a plurality of cells, a radio control device, and a management unit for managing a core network device. The transmission timing synchronization control unit performs a transmission timing synchronization process of the same information between a plurality of cells with a first period and a first precision, and when all of the plurality of cells are managed by the radio controller, the radio controller The transmission timing synchronization control unit provided in the terminal may be configured to perform transmission timing synchronization processing of the same information between the plurality of cells at a second period and at a second precision.

A second aspect of the present invention is a control apparatus used in a mobile communication system for transmitting the same information to a plurality of cells through one or a plurality of base stations and for synthesizing or selectively synthesizing the same information received by the mobile station. The transmission apparatus is provided with the transmission timing synchronization control part which sets the period which performs the transmission timing synchronization process of the same information, or the precision of the said transmission timing synchronization process between a some cell, depending on which base station or radio control apparatus is installed in it. It is the point to do it.

In a second aspect of the present invention, a base station for managing a plurality of cells, a radio control device, and a cell information management unit for managing a core network device are provided. When all of the plurality of cells are managed by a base station, The transmission timing synchronization control unit of the installed control device performs the transmission timing synchronization process of the same information between the plurality of cells with the first period and the first accuracy, and all of the plurality of cells are managed by the radio controller. In this case, the transmission timing synchronization control unit of the control device provided in the radio controller may be configured to perform transmission timing synchronization processing of the same information between the plurality of cells at a second period and at a second precision.

1 is a view for explaining a "UL / DL Node Synchronization" function according to the prior art.

2 is an overall configuration diagram of a mobile communication system according to an embodiment of the present invention.

3 is a functional block diagram of a control device (core network device, radio control device, base station) according to an embodiment of the present invention.

4 is a diagram showing an example of contents of management by a cell information management unit of a control device according to an embodiment of the present invention.

5 is a flowchart illustrating an operation of a mobile communication system according to an embodiment of the present invention.

6A is a diagram for explaining transmission timing synchronization control processing in a mobile communication system according to one embodiment of the present invention.

Fig. 6B is a diagram for explaining transmission timing synchronization control processing in the mobile communication system according to one embodiment of the present invention.

Fig. 6C is a diagram for explaining transmission timing synchronization control processing in the mobile communication system according to one embodiment of the present invention.

FIG. 7 is a diagram for explaining transmission timing synchronization control processing in a mobile communication system according to one embodiment of the present invention; FIG.

(Configuration of Mobile Communication System According to One Embodiment of the Present Invention)

Hereinafter, a configuration of a mobile communication system according to an embodiment of the present invention will be described with reference to FIGS. 2 to 4. 2 is a diagram showing the overall configuration of a mobile communication system according to the present embodiment.

The mobile communication system according to the present embodiment is a multicast communication system that transmits the same information to a plurality of cells through one or a plurality of base stations, and synthesizes or selectively synthesizes the same information received by the mobile station.

As shown in FIG. 2, the mobile communication system according to the present embodiment includes a core network device 1, a plurality of radio control devices 10, 20, and a plurality of base stations 11, 12, 21, 22. have. Here, cells A to H are managed by upper control devices (core network device, radio control device, base station), respectively. For example, as a core network device, an exchange Serving GPRS Support Node (SGSN) corresponds to this.

For example, the cells A and B are managed by the core network device 1, the radio control device 10, and the base station 11. In addition, the cells C and D are managed by the core network device 1, the radio controller 10 and the base station l2. That is, in the case of cell A, B, and cell C, D, although the core network apparatus 1 and radio control apparatus 10 which manage each of these are common, the base station which manages each is different.

Similarly, cells E and F are managed by the core network device 1, the radio control device 20 and the base station 21. Therefore, although the core network apparatus 1 which manages each of these is common in cell E, F, and cells A-D, the radio control apparatus and base station which manage each are different.

Here, the transmission timing synchronization process of the same information among a plurality of cells is performed by a control device which manages each cell in common.

For example, transmission timing synchronization processing of the same information between the cell A and the cell B is performed by the base station 11, the radio controller 10, or the core network device 1. In addition, the transmission timing synchronization process of the same information between the cell B and the cell C is performed by the radio | wireless control apparatus 10 or the core network apparatus 1. In addition, the transmission timing synchronization process of the same information between the cell D and the cell F is performed by the core network apparatus 1.

Therefore, the transmission timing synchronization process of the same information between the cell A and the cell B managed by the same base station 11 differs from the transmission timing synchronization process of the same information between the cell B and the cell C managed by the different base station. In comparison, transmission timing synchronization deviations are less likely to occur, and the accuracy of transmission timing synchronization processing is also high.

3 is a functional block diagram of a control device (core network device, radio control device, base station) 100 according to the present embodiment. As shown in FIG. 3, the control apparatus 100 which concerns on a present Example is provided with the cell information management part 100a and the transmission timing synchronization control part 100b.

The cell information management unit 100a manages a base station, a radio control device, and a core network device, each of which manages a plurality of cells.

Specifically, as shown in FIG. 4, the cell information management unit 100a manages "Cell", "Base Station", "Wireless Control Device", "Core Network Device", and "Identifier" in association.

Here, "identifier" indicates a path of the same information. For example, "identifier = 00000000" shows the path of the same information transmitted to the cell A as a destination via the core network apparatus 1, the radio control apparatus 10, and the base station 11. FIG. Here, the first and second bits 00 represent the core network device 1, the third and fourth bits 00 represent the radio control device 10, and the fifth and sixth bits 00 Base station 11 is represented, and the seventh and eighth bits 00 represent cell A. FIG.

The transmission timing synchronization control unit 100b performs a period for performing the transmission timing synchronization processing for each control device (core network device, radio control device, base station) 100 that performs transmission timing synchronization processing of the same information between a plurality of cells, or It is configured to set the precision of the transmission timing synchronization process. For example, the transmission timing synchronization control unit 100b performs different transmission timing synchronization processing for each control device (core network device, radio control device, base station) 100 that performs transmission timing synchronization processing of the same information between a plurality of cells. The precision of the period to be performed or the different transmission timing synchronization processing can be set.

(Operation of Mobile Communication System According to This Embodiment)

Referring to Fig. 5, the operation of performing transmission timing synchronization processing of the same information between a plurality of cells in the mobile communication system according to the present embodiment will be described.

As shown in Fig. 5, in step S100l, the mobile communication system according to the present embodiment refers to the cell information management unit 100a, which is also included in each control device 100, between cell # 1 and cell # 2. The control device which performs the transmission timing synchronization process of the same information is determined.

For example, when cell # 1 is "cell A" and cell # 2 is "cell B", in step S1002, as shown in Fig. 6A, the transmission timing provided in the base station 11 is shown. The synchronization control unit 100b performs transmission timing synchronization processing of the same information between the cells A and B with the first period and the first precision.

Specifically, the transmission timing synchronization control unit 100b provided in the base station 11 performs the transmission timing synchronization processing described above in a relatively long period (for example, once every 10 minutes with an error of less than 50 ms). That is, the transmission timing synchronization control unit 100b provided in the base station 11 uses the "UL / DL Node Synchronization" function shown in FIG. 1 to transmit delay in the downlink between the base station 11 and the cell A. FIG. The time and the transmission delay time in the downlink between the base station 11 and the cell B are measured, and based on the measurement result, the transmission timing for the cell A and the transmission timing for the cell B are determined.

In addition, the transmission timing synchronization control section 100b provided in the base station 11 is capable of performing maximum ratio synthesis on the same information in the mobile station (for example, accuracy in which the deviation of the received information in the mobile station is within 100 chips). The transmission timing synchronization process described above is performed. For example, the transmission timing synchronization control unit 100b provided in the base station 11 is configured to determine the above-described transmission timing in units of chips (see FIG. 7).

On the other hand, when cell # 1 is "cell B" and cell # 2 is "cell C", in step S1003, as shown in Fig. 6B, the radio controller 10 is provided. The transmission timing synchronization control unit 100b performs transmission timing synchronization processing of the same information between the cell B and the cell C at the second period and the second precision.

Specifically, the transmission timing synchronization control unit 100b provided in the radio controller 10 is described above at a period shorter than the first period (for example, once per minute at an error within 10 ms). Transmission timing synchronization processing is performed. That is, the transmission timing synchronization control unit 100b provided in the radio controller 10 uses the " UL / DL Node Synchronization " function shown in FIG. 1 to establish a connection between the radio controller 10 and the base station 11. The transmission delay time in the downlink and the transmission delay time in the downlink between the radio control apparatus 10 and the base station 12 are measured, and based on the measurement result, the transmission timing for the base station 11 and the base station The transmission timing for (12) is determined.

Moreover, the transmission timing synchronization control part 100b provided in the radio | wireless control apparatus 10 has the precision which can perform selective synthesis | combination with respect to the same information in a mobile station (for example, the deviation of the received information in a mobile station 80ms (34800 x 8). Accuracy within chip)] and the transmission timing synchronization control unit 100b described above are configured to determine the transmission timing described above in units of time slots (see FIG. 7).

In addition, when cell # 1 is "cell D" and cell # 2 is "cell E", in step S1004, as shown in Fig. 6C, the transmission timing provided in the core network device 1 is shown. The synchronization control unit 100b performs transmission timing synchronization processing of the same information between the cells D and E with the third period and the third precision.

Specifically, the transmission timing synchronization control unit 100b provided in the core network device 1 may be configured to perform the transmission timing synchronization processing described above at a period shorter than the second period. That is, the transmission timing synchronization control unit 100b provided in the core network device 1 uses the "UL / DL Node Synchronization" function shown in FIG. 1 to operate the core network device 1 and the radio controller 10. The transmission delay time in the downlink between and the transmission delay time in the downlink between the core network apparatus 1 and the radio control apparatus 20 are measured, and based on this measurement result, the radio control apparatus 10 The transmission timing for the radio control apparatus 20 and the transmission timing for the radio controller 20 are determined.

For example, the transmission timing synchronization control unit 100b provided in the base station 11 is configured to determine the transmission timing described above in units of frames (see FIG. 7).

In the case of passing through the radio control apparatus, it is difficult to perform the above-described transmission timing synchronization processing with the accuracy that the mobile station can perform the maximum ratio combining and selective combining for the same information. Therefore, in the core network apparatus 1, the above-described transmission timing It is possible to set not to perform synchronous processing.

For example, when the same information is transmitted to the cell A, the cell B, the cell D, and the cell E, the core network device 1 performs the transmission timing synchronization process between the cells A, B, D, and the cell E. FIG. And the radio controller 10 performs transmission timing synchronization processing between the cells A, B and D, and the base station 10 performs transmission timing synchronization processing between the cells A and B. have.

(Operation and Effects of the Mobile Communication System According to the Present Embodiment)

The mobile communication system according to the present embodiment solves the problems of the conventional multimedia communication system, and provides a mobile communication system capable of improving reception quality and effective use of radio resources in the mobile station.

As mentioned above, although an Example demonstrated this invention in detail, it is clear for those skilled in the art that this invention is not limited to the Example demonstrated in this specification. The apparatus of the present invention can be implemented as modifications and variations without departing from the spirit and scope of the present invention as defined by the description of the claims. Accordingly, the description herein is for the purpose of illustration and does not have any limiting meaning to the invention.

As described above, according to the present invention, it is possible to solve the problem of performing the multicast communication by the conventional mobile communication system, and to improve the reception quality at the mobile station and to effectively use radio resources. It is possible to provide a system and a control device.

Claims (4)

A mobile communication system for transmitting the same information to a plurality of cells through one or a plurality of base stations, and for maximum ratio synthesis or selective synthesis of the same information received by the mobile station, And a transmission timing synchronization control section for setting a period for performing the transmission timing synchronization processing and the precision of the transmission timing synchronization processing for each control device that performs the transmission timing synchronization processing of the same information between the plurality of cells. Mobile communication system. The method of claim 1, A base station managing each of the plurality of cells, a cell information management unit managing a radio control device and a core network device; When all of the plurality of cells are managed by the base station, the transmission timing synchronization control unit provided in the base station transmits the same information between the plurality of cells with a first period and a first precision. Perform synchronous processing, When all of the plurality of cells are managed by the radio control apparatus, the transmission timing synchronization controller provided in the radio control apparatus is configured to perform the same operation between the plurality of cells with a second period and a second precision. A mobile communication system characterized by performing transmission timing synchronization processing of information. A control apparatus used in a mobile communication system for transmitting the same information to a plurality of cells through one or a plurality of base stations and for maximum ratio synthesis or selective synthesis of the same information received by the mobile station, The transmission which sets the period which performs the transmission timing synchronization process of the said same information between the said some information, and the precision of the said transmission timing synchronization process, according to whether the said control apparatus is provided in the base station or the radio control apparatus. And a timing synchronization control unit. The method of claim 3, A base station managing each of the plurality of cells, a cell information management unit managing a radio control device and a core network device; When all of the plurality of cells are managed by a base station, the same timing information between the plurality of cells is controlled by the transmission timing synchronization control unit of the control apparatus provided in the base station at a first period and a first precision. Transmit timing synchronization processing When all of the plurality of cells are managed by the radio control apparatus, the transmission timing synchronization control unit of the control apparatus provided in the radio control apparatus is arranged between the plurality of cells with a second period and a second precision. And a transmission timing synchronization process of the same information.

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