KR100650252B1 - Method of transceiving an rssi in the mobile communication system - Google Patents

Abstract

An RSSI(Receive Signal Strength Indicator) transmitting and receiving method in a mobile communication system is provided to shorten a developing period because it is unnecessary to additionally correct hardware and to stabilize the performance of a system by allowing a channel processing modem to receive an RSSI value measured in an RF(Radio Frequency) module in the mobile communication system without additional hardware signals and to use the received RSSI value in the recovery of receiving data. When wireless data are received in a mobile communication system, an RSSI value for corresponding receiving data is measured(S32). A current time slot is confirmed according to a predetermined receiving data format(S33,S34). When the current time slot is a time slot in which null data or test data are loaded, the RSSI value is loaded in the corresponding time slot, and the receiving data are transmitted(S36). The receiving data are received according to the predetermined receiving data format, and a receiving data value and the RSSI value are successively recovered(S37). The receiving data are demodulated by using the corresponding RSSI value(S38).

Description

Method of transmitting and receiving RSSI in mobile communication system {Method of Transceiving an RSSI in the Mobile Communication System}

1 is a block diagram showing the structure of a general mobile communication system.

2 is a block diagram showing a configuration for transmitting and receiving RSSI (Receive Signal Strength Indicator) in a mobile communication system according to an embodiment of the present invention.

3 is a flowchart illustrating a RSSI transmission / reception method in a mobile communication system according to an exemplary embodiment of the present invention.

FIG. 4 is an exemplary diagram illustrating a received data format in FIG. 3. FIG.

Explanation of symbols on the main parts of the drawings

40: Channel Card

41: Baseband Modem

42: Receive Data and RSSI Recovery Block

43: controller

50: Control Board

60: Radio Frequency (RF) Board

61: Receive Data and RSSI Formatting Block

62: A / D (Analog to Digital) Converter

63: analog circuit section

64: control unit

The present invention relates to a method for transmitting / receiving RSSI in a mobile communication system, and more particularly, to a method for transmitting / receiving RSSI in a mobile communication system to receive a RSSI value measured in an RF board without hardware modification in the mobile communication system.

A structure of a general mobile communication system is illustrated in FIG. 1, and its configuration includes a baseband data processing block 10, a plurality of RF boards 20, and an antenna 30. ), And the baseband data processing block 10 includes a plurality of channel cards 11 and a control board 12.

The channel card 11 encodes data to be transmitted / received according to a predetermined standard and transmits the data through a transmission link, and demodulates and decodes the data received through the reception link. Plays a role. In this case, the transmission link indicates a transmission path of CDMA 1xEV-DO transmission data, and the reception link indicates that the channel card 11 is used to demodulate and decode the CDMA 1xEV-DO data received by the antenna 30. Receive path transmitted to).

The control board 12 receives data processed according to the 1xEV-DO standard from the channel card 11 and transmits the data to the RF board 20. Alternatively, a device that performs a role similar to that of the control board 12 may be used instead of the control board 12.

The RF board 20 D / A converts data received from the baseband data processing block 10 and transmits the data through the antenna 30 or transmits the data received through the antenna 30. A / D conversion is performed to the baseband data processing block 10.

In the general mobile communication system having the above-described configuration, CDMA transmission and reception data are serialized due to a large amount of information when transmitting on the backplane, and the antenna 30 and the RF board 20 are transmitted. The received down data converted by RF is processed by the control board 12 in a predetermined interface (Interface Format) with the channel card 11 to be received by the channel card 11.

In the general mobile communication system having the above-described configuration, a signal interface between heterogeneous boards in the same shelf is formed through a backplane (or a back board). Given that the life of the communication system is usually more than 10 years, the system architecture design that initially defines a single interface between heterogeneous boards should be designed with due regard for upgrades and evolution.

If the upgrade and functional development are not fully considered, the backplane and its boards need to be replaced, in which case service users have to devote a lot of time and manpower to catastrophic consumer complaints and system stabilization. Will occur.

For example, as a base station modem that processes baseband data processing mounted on a CDMA2000 1xEV-DO channel card, Qualcomm's 'CSM5500' or 'CSM6800' is used. To make a channel card. In this case, 'CSM5500' can be implemented using six chips, and 'CSM6800' can be implemented using one chip. Currently, products using 'CSM5500' are commercialized and While in service, the CSM6800 is under development.

In this case, when developing a 1xEV-DO channel card equipped with Qualcomm's 'CSM6800' supporting enhanced functions, the RSSI value measured by the RF board is required. Here, the RSSI value changes very quickly according to the channel environment. For the improved function, the RSSI value is received from the RF board within a short time of less than about 10 (ms) and used to restore the received data. Will occur.

In addition, in order for the channel card to receive the RSSI value transmitted from the RF board, a new signal path is required between the RF board and the channel card. In this case, a new backplane is newly supported to support the added signal path between heterogeneous boards. As a result, there is a problem of designing an RF board and a control board.

As a result, for systems with backplanes, control boards, and RF boards with new hardware modifications, system testing and stabilization periods are essential to upgrade to more advanced products without system quality and stabilization risks. You will need

In order to solve the above problems or necessity, the present invention provides a method for transmitting and receiving RSSI in a mobile communication system to receive the RSSI value measured in the RF board without hardware modification in the mobile communication system. have.

In addition, the present invention is to receive the RSSI value measured in the RF module (Module) in the mobile communication system by the Channel Processing Modem (Channel Processing Modem) received without using additional hardware signals (Hardware Signals) to restore the received data, There is no separate hardware modification from the system developer's point of view, so that it is possible to shorten the development period, improve system performance and stabilize.

In addition, the present invention is to modify the software in the existing mobile communication system so that the channel processing modem can receive the RSSI value measured in the RF module, it is possible to reduce the development period and product cost required for the function upgrade, in terms of service providers The goal is to improve system performance at low cost without risk of quality degradation.

RSSI transmission and reception method in a mobile communication system according to an embodiment of the present invention for achieving the above object, when wireless data is received to the mobile communication system side, by measuring the RSSI value for the received data and preset reception Identifying a current time slot according to a data format; When the current time slot is a time slot carrying data to be pressed or test data, transmitting the received data by putting the RSSI value in the corresponding time slot; And receiving the received data according to a preset received data format and sequentially restoring the received data value and the RSSI value, and demodulating the received data using the corresponding RSSI value.

The received data includes a parity bit, a sync tag bit, and data, and includes the RSSI value in an extra area.

As the number of mobile communication users increases, various electronic products are exposed to more and more interference and noise environments, so that devices receiving wireless data are required to further improve performance. The present invention relates to an efficient communication system for 1xEV-DO that supports RF measurement RSSI, that is, a system that supports data reconstruction using RSSI values measured in RF modules that have not been felt much. In order to stabilize the rate, the baseband modem recovering the data received through the antenna receives the RSSI value measured by the corresponding RF module and uses it to restore the received data. To improve the quality of

For example, in a system equipped with a 1xEV-DO channel card equipped with Qualcomm's 'CSM6800', RSSI value is added to CDMA received data and transmitted. Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the mobile communication system according to the embodiment of the present invention, the configuration for transmitting and receiving RSSI, as shown in Figure 2, so that a separate additional signal path for transmitting and receiving RSSI value does not exist in the backplane and other boards. Allows for firmware enhancement without hardware modifications. Here, the received data transmitted from the RF board 60 to the channel card 40 is loaded on the control board 50 in accordance with a time slot determined in the corresponding RF board 60, and remaining time slots. While the null data or the test data is transmitted during the present invention, in the present invention, the RF board 60 receives the RSSI in a time slot in which the null data or the test data in the received data of the channel card 40 are loaded. It is configured to send a value.

As shown in FIG. 2, the configuration includes a channel card 40, a control board 50, and an RF board 60, and a baseband modem 41 in the channel card 40. And a receiving unit 42 and a control unit 43, and in the RF board 60, a transmitting unit 61, an A / D converter 62, an analog circuit unit 63, and a control unit. Including 64.

The baseband modem 41 is a modem that modulates or demodulates baseband signals according to a standard of a wireless environment. The baseband modem 41 controls an RSSI value applied from the receiver 42 under the control of the controller 43. And demodulates the received data applied from the receiver 42.

The receiving unit 42 sequentially receives the data transmitted from the RF board 60 at a reference time point according to a rule determined by the control of the control unit 43 (ie, 1xEV-DO standard) from a predetermined time slot. And RSSI values are read and applied to the baseband modem 41.

The controller 43 controls the operation of the baseband modem 41 and the receiver 42.

The transmitter 61 receives the digital data from the A / D converter 62 and the RF board 60 together with the received data in accordance with a preset reception data format under the control of the controller 64. The RSSI value measured at is transmitted to the channel card 40 via the control board 50.

The A / D converter 62 digitizes the data received from the analog circuit 63 under the control of the controller 64 and applies the digitized received data to the transmitter 61.

The analog circuit unit 63 receives and applies wireless data received through an antenna of a mobile communication system to the A / D converter 62 under the control of the controller 64.

The controller 64 controls the operation of the transmitter 61, the A / D converter 62, and the analog circuit 63.

The method of transmitting and receiving RSSI in the mobile communication system according to an exemplary embodiment of the present invention will be described with reference to the flowchart of FIG. 3.

First, when wireless data is received to the mobile communication system through the antenna, the RF board 60 in the mobile communication system receives the corresponding wireless data through the antenna (step S31), and at this time, the RSSI value for the received data is received. Measurement is continued (step S32). Here, the RSSI value is a value that changes rapidly according to a wireless channel environment, and is used as an important value for accurate restoration of received data.

Accordingly, the analog circuit unit 63 provided in the RF board 60 receives and processes radio data received through the corresponding antenna under the control of the controller 64 provided in the RF board 60. The A / D conversion part 62 provided in the board 60 is applied.

Accordingly, the A / D converter 62 receives the data received from the analog circuit 63 to convert the received analog data into digital data and converts the converted digital data into the RF board 60. It is applied to the transmitting part 61 provided in the inside (step S33).

Then, the transmitter 61 receives the digital data from the A / D converter 62 and the RSSI together with the received digital data in accordance with a preset received data format under the control of the controller 64. The value is transmitted to the control board 50 in the mobile communication system. For example, the digital data and the RSSI value are transmitted at the reference time point in the order shown in FIG. 4. At this time, depending on the system structure, the information made and processed in the RF board 60 is passed through the control board 50, or is directly transmitted to the channel card 40 in the mobile communication system.

4 is a table illustrating an example of a received data format, and is an example of a system using a 'CHIPx32 (ie, 39.3216 (MHz))' clock used for CDMA. In addition, '0' to '31' on the left means the number of time slots. As shown in FIG. 4, data to be sent to the channel card 40 includes a parity bit, a synchronous tag bit, and data. The RSSI is stored in a reserved area. By sending the value, you can easily use the enhanced function.

This operation can be easily implemented by modifying the firmware of the corresponding control module or block of the channel card 40 or the RF board 60. The transmitter 61 transmits the digital data applied from the A / D converter 62 to the channel card 40 at a time slot determined by the RF board 60. In this case, the A / D conversion is performed. It is checked whether the digital data applied from the unit 62 is valid data or pressed data or test data.

That is, the transmitter 61 checks the current time slot according to a preset received data format. When the digital data applied from the A / D converter 62 is transmitted to the channel card 40, the current time is transmitted. It is checked whether the slot is a time slot carrying valid data or a time slot carrying pressed data or test data (step S34).

If, in the 34th step S34, the data to be pressed or the test data slot is loaded, the transmitter 61 loads the RSSI value in the corresponding time slot (step S35) and the channel card 40 (Step S36).

Accordingly, when data in which the reception data format is matched in the RF board 60 is transmitted to the channel card 40, the channel card 40 demodulates and decodes the data received through the reception link. A processor calculates a predetermined algorithm and transfers it to the baseband modem 41 provided in the channel card 40 so as to be used for demodulation.

At this time, the receiving unit 42 provided in the channel card 40 at the reference time point according to a rule (that is, the 1xEV-DO standard) determined by the control of the control unit 43 provided in the channel card 40. The data transmitted from the RF board 60 is sequentially read from the predetermined time slot, and the received data value is restored. At this time, the RSSI value is also restored (step S37). In addition, the recovered RSSI value is transmitted to the baseband modem 41.

Accordingly, the baseband modem 41 demodulates the received data applied from the receiver 42 using the RSSI value applied from the receiver 42 under the control of the controller 43 (step S38), more accurately determine the wireless channel environment and informs the terminal of the wireless channel environment to enable the optimal wireless call.

As described above, a development period required for upgrading a function in terms of system developers by allowing the channel processing modem to receive and use the RSSI value measured by the RF module in the mobile communication system to restore the received data without additional hardware. And product cost can be reduced, and system performance can be improved and stabilized at low cost without any risk of quality degradation from the service provider side.

Claims (2)

When the wireless data is received by the mobile communication system, measuring RSSI of the received data and identifying a current time slot according to a preset received data format; When the current time slot is a time slot carrying data to be pressed or test data, transmitting the received data by putting the RSSI value in the corresponding time slot; And receiving the received data according to a preset received data format, sequentially restoring the received data value and the RSSI value, and demodulating the received data using the corresponding RSSI value. RSSI transmission and reception method in a communication system. The method of claim 1, The received data includes a parity bit, a sync tag bit, and data, and includes the RSSI value in an extra area.

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