KR20030030369A - A bus apparatus for a base station modem chipsets - Google Patents

Abstract

PURPOSE: A bus device for a base station modem chip set of a mobile system is provided to effectively implement a base station system by using a structure of a modulation chip set, a demodulation chip set and a preamble searching unit chip set which are separated by functions and a modem structure with an MCB and MFB device for communication between chip sets on the basis of a service of an overall base station. CONSTITUTION: A modulator chip set(100) consists of a modulator(120) for encoding a data to be transmitted, band-spreading it and outputting it to a transfer filter, an MCB controller(160) for MCB-controlling, and an MFB controller(140) for MFB-controlling. A demodulator chip set(200) consists of a demodulator(220) for receiving the spread band signal, compensating its phase and decoding it, an MCB controller(260) for MCB-controlling and an MFB controller(240) for MFB-controlling. A preamble searching unit chip set(300) consists of a preamble searching unit(320) for receiving a spread band signal and detecting a timing from a preamble signal and an MCB controller(340) for MCB-controlling. An MCB(600) is used to transfer data required between the chip sets(100,200,300). An MFB(500) is a dedicated bus used to control power between the demodulator(220) and the modulator(120). The MFB(500) transfers downlink power control information, an uplink power control command and control information for site selection diversity transmission.

Description

BUS APPARATUS FOR A BASE STATION MODEM CHIPSETS

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base station modem apparatus of a mobile system, and more particularly, to a bus apparatus for communication between chipsets and a chipset structure of a base station modem for a 3rd generation partnership project (3GPP) IMT-2000.

The initial modem structure used in the base station system of the code division multiplex (CDMA) communication was a chipset structure with separate functions in the form of a modulator, a demodulator, and a channel codec, which was a voice service-oriented modem for a single user. The modem of the standard (e.g., IS-95A) has little communication amount of the modulator and demodulator. These chipsets have been implemented on a single chip with the advancement of semiconductor integrated technology, and nowadays, a single chip has evolved to support multiple multi-users.

However, in the base station system supporting the 3GPP IMT-2000 standard, the difference between the maximum 2Mbps data service and the random access method limits the number of multi-users that can be supported when the transmitter (modulator) and the receiver (demodulator) are integrated in a single modem. . Therefore, the base station system is enlarged due to the increase in the channel card capable of mounting a limited modem chip, there is a problem that the installation and maintenance costs increase. In addition, when configuring as a single chip, all necessary functions (for example, a 2Mbps data transceiver and a preamble finder used for 2M data service) must be implemented in a single modem, so unnecessary functions are redundant in terms of service of the entire base station. Due to this, there is a problem that the size of the modem increases and power consumption increases.

The technical problem to be achieved by the present invention is to solve the problems of the prior art, by presenting a modem structure having a separate chipset structure for each function and a bus device for communication between chipsets based on the service of the base station as a whole It is an object of the present invention to provide a method for implementing a base station system.

1 is a diagram showing a base station modem apparatus according to an embodiment of the present invention.

2 illustrates a modem common bus (MCB) structure according to an embodiment of the present invention.

3 illustrates a modem feedback bus (MFB) structure according to an embodiment of the present invention.

4 is a diagram illustrating an MCB controller according to an embodiment of the present invention.

5 is a diagram illustrating an MFB controller according to an embodiment of the present invention.

Base station modem apparatus of a mobile communication system according to an aspect of the present invention for achieving the above object

A modulator chipset having a modulator for encoding and spreading data to be transmitted and outputting the spread spectrum to a transmission filter; A preamble searcher chipset having a preamble searcher for receiving a spread band signal and detecting timing from the preamble signal; A demodulator chipset having a demodulator for receiving a spread band signal from a terminal to compensate for a phase and decoding the phase; A first bus which is a dedicated bus for transferring data required between the modulator chipset, the preamble finder chipset and the demodulator chipset; And a second bus which is a dedicated bus used to perform power control between the demodulator and the modulator.

Here, the modulator chipset, the demodulator chipset, and the preamble finder chipset each include a first bus controller for controlling the first bus, and the modulator chipset and the demodulator chipset are second to control the second bus. Each includes a bus controller.

On the other hand, the base station modem apparatus of the mobile communication system according to another aspect of the present invention

A modulator chipset having a modulator for encoding and spreading data to be transmitted and outputting the spread spectrum to a transmission filter; A preamble searcher chipset having a preamble searcher for receiving a spread band signal and detecting timing from the preamble signal; A demodulator chipset having a demodulator for receiving a spread band signal from a terminal to compensate for a phase and decoding the phase; And a dedicated bus for transferring data necessary between the modulator chipset, the preamble finder chipset, and the demodulator chipset.

On the other hand, the base station modem apparatus of the mobile communication system according to another aspect of the present invention

A modulator chipset having a modulator for encoding and spreading data to be transmitted and outputting the spread spectrum to a transmission filter; A preamble searcher chipset having a preamble searcher for receiving a spread band signal and detecting timing from the preamble signal; A demodulator chipset having a demodulator for receiving a spread band signal from a terminal to compensate for a phase and decoding the phase; And a dedicated bus used to perform power control between the demodulator and the modulator.

Hereinafter, with reference to the drawings will be described an embodiment of the present invention;

A base station modem apparatus according to an embodiment of the present invention relates to a modem used in a 3GPP-IMT 2000 base station system. The modem structure of the present embodiment provides communication between a chipset structure and a chipset separated for each function based on the service of the base station as a whole. Has a bus device. In the embodiments described below, a description will be made based on a modem structure mainly used in a 3GPP-IMT 2000 base station system, but it can be applied to other communication methods.

As such, when separating chipsets by functions, communication between chipsets that does not occur in a single chip occurs, so a minimum amount of communication and a reliable communication device should be considered. Accordingly, the modem according to the embodiment of the present invention has a bus device that ensures smooth communication between chipsets and a function-specific chipset structure for avoiding duplication of resources and multi-user support. Specifically, in the embodiment of the present invention, as described below, the 3PP IMT-2000 base station modem is divided into a transmitter (modulation chip set) and a receiver (demodulation chip set), and a preamble searcher (Preamble Searcher) occupies a relatively large implementation area in the receiver. ), It consists of three chipsets separately and uses the structure of Modem Feedback Bus (MFB) bus and Modem Common Bus (MCB) bus device for communication between chipsets.

1 is a diagram showing a modem base station modem apparatus according to an embodiment of the present invention.

As shown in FIG. 1, a modem device according to an embodiment of the present invention includes a DSP for controlling a modulator chipset 100, a demodulator chipset 200, a preamble finder chipset 300, and a chipset 100, 200, and 300, respectively. 410, 420, 430, a modem common bus (hereinafter referred to as "MCB") 600, and a modem feedback bus (hereinafter referred to as "MFB") 500.

The modulator chipset 100 includes a modulator 120 for encoding, spreading, and outputting data to be transmitted to a transmission filter, an MCB controller 160 for MCB control, and an MFB controller 140 for MFB control.

The demodulator chipset 200 is composed of a demodulator 220 for receiving a spread band signal, compensating for phase, and decoding it, an MCB controller 260 for MCB control, and an MFB controller 240 for MFB control.

The preamble searcher chipset 300 includes a preamble searcher 320 for receiving a spread band signal and detecting timing from the preamble signal, and an MCB controller 340 for controlling the MCB.

The MCB 600 is used to transfer data required between chipsets 100, 200, and 300. The MCB structure according to the embodiment of the present invention has a control signal 12 and data as shown in FIG. 2. It consists of 14.

As shown in FIG. 2, the MCB control signal 12 according to the embodiment of the present invention is a signal for synchronizing the internal counters of each chipset (SYNC), a signal for using the MCB on the transmitting side (ASSERT), transmission There is a clock signal TX CLOCK and a signal REJECT informing the transmitting side of the reception impossible.

The MCB data signal 14 includes a header HEADER for transmitting information necessary for data transmission and a portion DATA for transmitting substantial data. The header includes the send address, the receive address, the length of the data transfer and the data processing instructions. In an embodiment of the present invention, data is transmitted in units of one block. For example, in case of transmitting an AICH (acquisition indicator channel) from the preamble finder chipset to the demodulator chipset, the header indicates a preamble finder address (send address) and a demodulator address (receive address). ), The length of data to be transmitted (one block) and information that the data to be transmitted is used for the AICH.

MFB 500 is a dedicated bus used to perform power control between demodulator 220 and modulator 120. Specifically, MFB 500 includes downlink power control information, uplink power control commands and site select diversity. Transfer control information for site selection diversity transmission (SSDT). The MFB 500 according to the embodiment of the present invention is composed of a synchronization signal MFB_FS and a data signal MFB_DATA.

As shown in FIG. 3, the MFB according to the embodiment of the present invention has a length of 2560 chips and consists of 16 frames Frm. 0, Frm. 1,..., Frm. 15. One frame has a length of 160 chips and consists of 32 slots, and one slot transmits 10 fields. The information transmitted by one slot is composed of downlink power control information, uplink power control information, and SSDT information. Specifically, as shown in FIG. 3, D- having valid information of data as shown in FIG. 4 fields of valid, F-valid, U-valid, S-valid, transmit power control (TPC) field for downlink power control (DL_TPC), field for feedback information (FBI_D), TPC field (UL_TPC field) for uplink power control, and two fields (CELL_A, CELL_B) for power control information for CELL-A and CELL-B.

Here, D-valid, F-valid, U-valid, and S-valid are fields indicating whether downlink power information, feedback information, uplink power information, and SSDT information are valid, respectively. The DL_TPC field and the FBI field for the downlink power control are generated at the boundary of the received uplink slot, and the UL_TPC field for the uplink power control is generated after measuring the signal to interference ratio (SIR) of the received uplink signal.

The MFB_FS is used for frame synchronization. The MFB_FS may be generated every frame, and may be generated in a predetermined number of frame units (16 frames in FIG. 3) as shown in FIG.

Next, an MCB controller according to an embodiment of the present invention will be described with reference to FIG. 4.

The MCB controller according to an embodiment of the present invention includes a buffer unit 10 for storing data required for transmission and reception, a comparison unit 20 for determining whether the MCB of the chipset is available, and a priority for determining priority in the use authority. The ranking unit 30, and the counter unit 40 for allocating the MCB usage rights to each chipset. The MCB controller according to the embodiment of the present invention is commonly required for the modulator chipset 100, the demodulator chipset 200, and the preamble finder chipset 300, and each chipset operates in a given order. To this end, the chipset ID, which is an ID for operation, is preset for each chipset.

The transmission process of the MCB controller according to the embodiment of the present invention is as follows.

First, the data to be transmitted by the DSP controlling the transmission chipset is stored in the buffer unit 10. When data storage is completed in the buffer unit 10, the comparison unit 20 of the MCB controller of the transmitting chipset determines whether the value counted by the counter unit 40 and the set chipset ID value match. The comparator 20 determines that the MCB usage right is allocated when the count value of the counter 40 and the chipset ID value match, and prevents another chipset from using the MCB by using the ASSERT signal shown in FIG. 2. do. At this time, the internal counters of the MCB controllers of all chipsets stop operation. The MCB controller of the transmitting chipset transmits the data stored in the buffer unit 10 to the receiving chipset using the MCB. When the transfer is complete, the transmit chipset uses ASSERT to make the MCB available to other chipsets.

The reception process of the MCB controller of the present invention is as follows.

First, the comparison unit 20 analyzes the header of the received data and checks whether the receiving address matches its chipset ID. If the receiving address matches the receiving chipset ID, it is checked whether there is data received in the buffer unit 10. If there is data in the buffer unit 10, the REJECT signal is used to inform the transmitting chipset to stop data transmission. If there is no data received in the buffer unit 10, the receiving chipset receives the transmitted data. When the reception is complete, the receiving chipset informs the DSP that data reception is complete.

The transmission and reception processes of the MCB controller described above are common to all chipsets.

In general, the amount of data transmission used by the preamble search chipset is larger than the data transmission rates of the modulation chipset and the demodulation chipset, and in the embodiment of the present invention, the number of times of use of the MCB of the preamble searcher with a relatively high transmission amount is increased in order to use the MCB more efficiently. To be designed. To this end, the preamble finder chipset sets the chipset ID for using the MCB more than that of the modulator chipset and demodulator chipset.

Next, an MFB controller according to an embodiment of the present invention will be described with reference to FIG. 5.

As shown in Fig. 5, the MFB controller according to the embodiment of the present invention has a first counter 50 for allowing each demodulator and modulator to use the MFB bus without collision, and 10 of the MFB when the usage right is assigned. An output for outputting an MFB field and a comparator 70 for determining whether there is a right to use the MFB bus using information of the second counter 60 and the first counter 50 used to transmit the two fields It is composed of a portion (80).

The transmission process of the MFB controller according to the embodiment of the present invention is as follows.

First, the comparator 70 determines whether the value assigned to each chipset and the first counter value match. As a result of the above judgment, if the chipset currently has the authority to use the MFB (i.e., the value assigned to the chipset and the first counter value match), the demodulator or modulator sends the data to be transmitted to the output unit 80. send. The output unit transmits the data received through the comparison unit in units of ten fields by using the second counter 60.

According to an embodiment of the present invention, the modulator and the demodulator are connected one-to-one, so that, for example, when data related to power control is transmitted through a MFB in a specific demodulator, the data is received by a modulator corresponding to the demodulator.

As mentioned above, although embodiment of this invention was described, this invention is not limited only to the above-mentioned embodiment, A various other change and a deformation | transformation are possible.

For example, the embodiment described above is described based on the modem structure used in the 3GPP-IMT 2000 base station system, but may be applied to other communication methods. .

In addition, in the above-described embodiment, a method of simultaneously using the MCB and the MFB has been described. However, only the MCB or the MFB may be used.

As described above, since the present invention uses a modem structure having a modulator chipset, a demodulator chipset, a preamble finder chipset structure, and an MCB and MFB device for communication between chipsets, which are separated for each function based on the service of the entire base station. Compared to the case of using a chip, an efficient base station system can be implemented.

Claims (20)

A base station modem apparatus of a code division multiple access mobile communication system, A modulator chipset having a modulator for encoding and spreading data to be transmitted and outputting the spread spectrum to a transmission filter; A preamble searcher chipset having a preamble searcher for receiving a spread band signal and detecting timing from the preamble signal; A demodulator chipset having a demodulator for receiving a spread band signal from a terminal to compensate for a phase and decoding the phase; A first bus which is a dedicated bus for transferring data required between the modulator chipset, the preamble finder chipset and the demodulator chipset; And And a second bus which is a dedicated bus used to perform power control between the demodulator and the modulator. The method of claim 1, And the first bus includes a control signal for control and a data signal for data transmission. The method of claim 2, The control signal is A synchronization signal SYNC for synchronizing an internal counter, a signal ASASS for using the first bus at the transmitting side, a transmission clock signal, and a signal informing the transmitting side of the reception impossibility at the receiving side; Base station modem apparatus of a mobile communication system. The method of claim 2, The data signal is A base station modem apparatus of a mobile communication system, comprising a header portion including a transmission address, a reception address, a length of a data transmission, and a data processing instruction, and a data portion to which substantial data is transmitted. The method according to any one of claims 1 to 4, Wherein said modulator chipset, said demodulator chipset, and said preamble finder chipset each include a first bus controller for controlling said first bus. The method of claim 5, The first bus controller Counter unit; A buffer unit for storing data necessary for transmission and reception; And a comparator for determining whether a chipset can use the first bus by determining whether a value counted by the counter and a set chipset ID value coincide with each other. The method of claim 6, And the first bus controller further comprises a priority determiner which determines a priority in the usage rights of the first bus. The method of claim 6, The first bus controller And controlling the number of times of use of the preamble searcher for the first bus more than the number of times of use of the modulator and the demodulator for the first bus. The method of claim 1, And the second bus transmits downlink power control information, uplink power control information, and control information for site selection diversity transmission. The method of claim 9, The second bus A data signal for transmitting data and a synchronization signal for frame synchronization, The data signal includes a plurality of frames, and the frame comprises a set of slots for transmitting the downlink power control information, uplink power control information, and control information for site selection diversity transmission. Base station modem device in the system. The method of claim 10, The slot is A field having valid information of data, a field for downlink power control (DL_TPC), a field for feedback information (FBI_D), a field for uplink power control (UL_TPC field), and a field for power control information for a cell A base station modem apparatus of a mobile communication system, characterized in that. The method of claim 11, Wherein said modulator chipset and said demodulator chipset each include a second bus controller for controlling said second bus. The method of claim 12, The second bus controller A first counter; A comparator for determining whether a chipset is authorized to use the second bus by determining whether a value assigned to each chipset and a value counted by the first counter match; And a second counter for counting the number of fields included in the slot and transmitting the counted number of fields included in the slot to the second bus. A base station modem apparatus of a code division multiple access mobile communication system, A modulator chipset having a modulator for encoding and spreading data to be transmitted and outputting the spread spectrum to a transmission filter; A preamble searcher chipset having a preamble searcher for receiving a spread band signal and detecting timing from the preamble signal; A demodulator chipset having a demodulator for receiving a spread band signal from a terminal to compensate for a phase and decoding the phase; And And a dedicated bus for transferring necessary data between the modulator chipset, the preamble finder chipset, and the demodulator chipset. The method of claim 14, And the modulator chipset, the demodulator chipset, and the preamble finder chipset each include a bus controller for controlling the dedicated bus. The method of claim 15, The bus controller Counter unit; A buffer unit for storing data necessary for transmission and reception; And a comparator configured to determine whether a chipset can use the dedicated bus by determining whether the counter value and the set chipset ID value match. A base station modem apparatus of a code division multiple access mobile communication system, A modulator chipset having a modulator for encoding and spreading data to be transmitted and outputting the spread spectrum to a transmission filter; A preamble searcher chipset having a preamble searcher for receiving a spread band signal and detecting timing from the preamble signal; A demodulator chipset having a demodulator for receiving a spread band signal from a terminal to compensate for a phase and decoding the phase; And A base station modem apparatus of a mobile communication system including a dedicated bus used to perform power control between the demodulator and the modulator. The method of claim 17, Wherein said modulator chipset and said demodulator chipset each comprise a bus controller for controlling said dedicated bus. The method of claim 18, The dedicated bus A data signal for transmitting data and a synchronization signal for frame synchronization, The data signal is composed of a plurality of frames, and the frame comprises a set of slots for transmitting the downlink power control information, uplink power control information, and control information for site selection diversity transmission. Base station modem device in the system. The method of claim 19, The bus controller A first counter; A comparison unit determining whether a chipset is authorized to use the dedicated bus by determining whether a value assigned to each chipset and the value counted by the first counter match; And a second counter for counting and transmitting the number of fields included in the slot to the dedicated bus when it is determined that the comparator has permission to use the comparator.