KR100307404B1 - Serial data combiner of channel card in radio port of the mobile communication system - Google Patents

Abstract

The present invention reduces the logic by directly combining the dual serial data stream without converting in parallel to the double demux serial data stream output from the channel card in the base station of the mobile communication system employing the CDMA scheme such as DCS or PCS. The present invention relates to a serial data combiner device of a channel card in a base station of a mobile communication system, wherein the serial data of an even bit string and the serial data of an odd bit string output from a channel card called A and a channel card called B, and a carry carried back. And outputs to the 2-bit full adder according to the value of the count signal, and then adds the serial data of even bit strings to each other in the 2-bit full adder, and adds the serial data of the odd bit strings to each other. Clock output of serial data result and odd bit string serial data result and carry Outputs to D flip-flop according to the arc, and latches serial data result of even bit string, serial data result of odd bit string and carry in this D flip flop, and then serial data result of even bit string through S / P converter. And converting the serial data result values of the and odd bit strings in parallel and feeding the carry back to the data controller.

Description

Serial data combiner of channel card in base station of mobile communication system {Serial data combiner of channel card in radio port of the mobile communication system}

The present invention is a mobile communication system employing a code division multiple access (CDMA) scheme such as a digital cellular system (hereinafter referred to as 'DCS') or a personal communication system (hereinafter referred to as 'PCS'). In a base station of a communication system, directly combining a dual serial data string without converting the parallel demuxed serial data string output from a channel card into parallel. The present invention relates to a serial data combiner device of a channel card in a base station of a mobile communication system to reduce logic.

In general, in a base station of a mobile communication system employing a CDMA scheme such as DCS and PCS, a channel card using a cell site modem (hereinafter, referred to as a 'CSM') through an adder circuit, that is, a combiner The forward data output from is added.

That is, conventionally, when adding forward data output from the CSM in the channel card, first convert the double demuxed serial data string output from the CSM into parallel data, and then add the converted parallel data.

However, the method of combining the forward data using the parallel combiner device as described above uses a lot of logic, which requires more cost and complicated circuit.

The present invention has been made to solve the above problems, the object of which is to convert in parallel to the double demux serial data string output from the channel card in the base station of the mobile communication system applying the CDMA method such as DCS, PCS, etc. In order to provide a serial data combiner device of a channel card in a base station of a mobile communication system, by directly combining the dual serial data streams, the configuration is simpler than the conventional parallel combiner device, and the number of logics can be reduced. have.

1 is a block diagram of a serial data combiner device of a channel card in a base station of a mobile communication system according to the present invention;

2 is a timing diagram applied to a serial data combiner device of a channel card in a base station of a mobile communication system according to the present invention;

3 is a block diagram of a case where a serial data combiner device of a channel card in a base station of a mobile communication system according to the present invention is applied to N channel cards.

<Description of the symbols for the main parts of the drawings>

1: timing controller 2: data controller

3: 2 bit full adder 4: D flip-flop

5: S / P conversion section 6-1 to 6-5: First to fifth adding section

The serial data combiner device of the channel card in the base station of the mobile communication system according to the present invention for achieving the above object, the serial data of the even bit string and the serial data of the odd bit string output from the channel card of A and the channel card of B; Inputs the carry back and outputs it to the 2-bit full adder according to the value of the count signal, and then adds the even-numbered serial data to each other in the 2-bit full-adder, and generates the carry data and the serial data of the odd-bit strings. Add and output serial data result of even bit string and serial data result and carry of odd bit string to D flip-flop according to the clock signal.In this D flip-flop, serial data result of even bit string and serial data result of odd bit string After latching the value and the carry, the S / P converter converts the serial data And converting the serial data result values of the odd bit strings in parallel and feeding the carry back to the data controller.

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration and operation of the serial data combiner device of the channel card in the base station of the mobile communication system according to the present invention.

1 is a block diagram of a serial data combiner device of a channel card in a base station of a mobile communication system according to the present invention, and is based on a system clock (SYS_CLK) and an even second clock (/ PP2S) input to an external CSM. Timing for supplying a clock signal to each component of the binner device, and supplying a count signal to each component of the combiner device to realize an octal counter so that the boundary of the word of serial data can be known. (Timing) The control unit 1, serial data A_E, B_E of even bit strings and serial data A_O, B_O of odd bit strings, output from two (A and B) channel cards, And a data controller 2 for inputting a carry output from the D flip-flop to output the serial data and the carry according to the value of the count signal output from the timing controller 1, and the data controller 2; Even bits output from Add serial data (A_E, B_E) of each other, and add the carry and serial data (A_O, B_O) of odd bit strings to each other to obtain serial data result values of even bit strings and serial data result values and carry of odd bit strings. The two-bit full adder 3 outputs according to the clock signal output from the timing controller 1, the serial data result value of the even bit string output from the two-bit full adder 3, and the odd bit string. Latches and outputs a serial data result value and a carry, and outputs the carry to the data controller 2, and an even bit string output from the D flip-flop 4. The S / P converter 5 converts the serial data result value and the serial data result value of the odd bit string in parallel and outputs the result.

The operation of the serial data combiner device of the channel card in the base station of the mobile communication system according to the present invention configured as described above will be described with reference to the timing diagram of FIG.

Here, (a) and (b) of FIG. 2 are system clocks and even second clocks synchronized with externally supplied CSMs, and CSMs are synchronized with the two clocks, such as (c) and (d) of FIG. Generates demuxed serial data.

The CSM outputs 16 bits of data, i.e., b0 to b15, in parallel without outputting in parallel. Demuxed into b8, b10, b12, b14 and odd bit strings b1, b3, b5, b7, b9, b11, b13, b15 and output.

In this case, b15 is an odd parity bit, b14 is a sign bit, and this data is a 2'S complement format.

2 (a) and (d), A_E is an even bit string output from a channel card called A, and 0, 2, 4, 6, 8, 10, 12, and S are b0, b2, b4, b6, b8, b10, b12, sign bits, A_O is an odd bit string output from the channel card A, 1, 3, 5, 7, 9, 11, 13, P is b1, b3, b5, b7, respectively , b9, b11, b13, and parity bits.

In addition, B_E and B_O mean an even bit string and an odd bit string of the channel card B, respectively.

Referring to the timing diagram of FIG. 2, when the even second clock of FIG. 2B is low and the system clock of FIG. 2A is falling, the start point of one word is shown.

That is, when the value of the count signal of FIG.

First, the timing controller 1 receives an external second clock and an even clock which are synchronized with the CSM. The system clock is the 2-bit full adder 3, the D flip-flop 4, and the S / P converter. It is supplied to (5) and used as a clock signal of each component.

The even second clock, together with the system clock, allows the word boundary of the serial data to be known, and drives an octal counter to count down from '0' as shown in FIG.

As shown in (e) of FIG. 2, when the value of the count signal is '0', it indicates the start of one word of 16 bits.

Subsequently, the data control unit 1 performs serial data A_E and B_E of even bit strings, serial data A_O and B_O of odd bit strings, and the D flip-flop 4 output from a channel card A and a channel card B. Receives a carry output from the and performs two functions according to the value of the count signal output from the timing controller (1).

That is, in the first case, when the carry is received from the D flip-flop 4, if the count signal output from the timing controller 1 is '0', the start of one word, that is, the least significant bit, is equal to 2 If the value of the count signal is not '0', it is output to the two-bit full adder 3 as it is a carry generated at the lower end.

The second function is to add the double channel card output by extending the parity bit among the data input from the channel card to the 16 bit data without the parity bit by making the parity bit the same as the sine bit.

The 2-bit full adder 3 adds the serial data A_E of the even bit string of the A channel and the serial data B_E of the even bit string of the B channel among the serial data of the channel card output from the data control unit 2, The carry generated at this time, the serial data A_O of the odd bit string of the A channel, and the serial data B_O of the odd bit string of the B channel, are added among the serial data of the channel card output from the data control unit 2.

Thereafter, the serial data result value of the even bit string, the serial data result value of the odd bit string, and the final carry generated in accordance with the addition process are output to the D flip-flop 4 in synchronization with the clock signal output from the timing controller 1. do.

Accordingly, the D flip-flop 4 latches the serial data result value of the even bit string and the serial data result value of the odd bit string and the final carry output from the 2-bit full adder 3, and then serializes the even bit string. The data result value and the serial data result value of the odd bit string are output to the S / P converter 5, and the final carry is output to the data controller 2, respectively.

Then, the S / P converter 5 parallelly outputs the serial data result value of the even bit string and the serial data result value of the odd bit string, that is, the double demux serial data string output from the D flip-flop 4 in parallel. Convert and output to the next stage.

The carry output from the D flip-flop 4 is sent to the data control unit 2 to be added to the next bit string.

3 is a block diagram of a case where a serial data combiner device of a channel card in a base station of a mobile communication system according to the present invention is applied to N channel cards, and an example in which the present invention can be applied to three or more channel cards. It is a block diagram showing.

The first to fifth adders 6-1 to 6-5 include a data control unit 2, a 2-bit full adder 3, and a D flip-flop 4. N means N channels, and ST: 1 to ST: K mean each stage to add.

As shown in Fig. 3, the outputs of channel 1 and channel 2 are added to each other in the first adder 6-1 of ST: 1, and the outputs of channel N-1 and channel N are second additions of ST: 1. It is added in the part 6-2.

Subsequently, each of the third and fourth adding units 6-3 and 6-4 of ST: 2 includes the first adding unit 6-1 and the second adding unit 6-2 of ST: 1. By repeating the addition operation such as adding the data outputted from S, the fifth adder 6-5 of the final ST: K adds the output data from ST: K-1 to add the final addition result data to S /. Output to the P converter 5.

The S / P converter 5 then converts the input serial data into parallel data.

Then, the timing controller 1 performs the same function as in FIG. 1, where the data controller in the first adder 6-1 performs the same function as in FIG. Since different carry processing methods are not applied uniformly depending on the value of the count signal, parity processing is performed only at ST: 1.

As described above, the present invention provides a conventional parallel combiner by directly converting the dual demuxed serial data output from the CSM in the channel card into parallel data without directly converting the serial demux data stream into parallel data. This simplifies configuration and significantly reduces the number of logics than devices, making the system economical.

It is also very effective in adding the output of a large amount of channel cards.

Claims (2)

A combiner device for adding output data of a channel card using a CSM of a base station on a forward path of a mobile communication system employing a CDMA method, The clock signal is supplied to each component of the combiner device according to the system clock (SYS_CLK) and even second clock (/ PP2S) input from the external CSM, and the octal counter is implemented to determine the boundary of the word of the serial data. A timing controller for supplying a count signal to each component of the combiner device, an even bit string serial data (A_E, B_E) and an odd bit string serial data (A_O) output from two (A and B) channel cards. , B_O), and a data controller for inputting a carry output from the D flip-flop and outputting the serial data and the carry according to the value of the count signal output from the timing controller, and serial data of an even bit string output from the data controller. (A_E, B_E) are added to each other, and the resultant carry data and the serial data (A_O, B_O) of odd bit strings are added to each other, resulting in serial data of even bit strings. A 2-bit full adder for outputting serial data result values and a carry of odd bit strings according to a clock signal output from the timing controller, a serial data result value for even bit strings output from the 2-bit full adder, and a serial data result for odd bit strings Latches and outputs a value and a carry, and converts the D flip-flop outputting the carry to the data control unit and the serial data result of the even bit string and the serial data result of the odd bit string outputted in the D flip-flop in parallel. A serial data combiner device of a channel card in a base station of a mobile communication system, characterized by comprising a S / P conversion unit for outputting. 2. The apparatus of claim 1, further comprising a data control unit, a 2-bit full adder, and a D flip-flop to add a serial data string output from the two channel cards by pairing them from channel 1 to channel N. A first and second adders of ST: 1, the data control unit, a 2-bit full adder, and a D flip-flop, and add two pairs from the first adder to the second adder A third adder of ST: 2 which adds the data outputted from the sub-unit again, the data control unit, a 2-bit full adder and a D flip-flop, and two adders of ST: K-1. And serially outputting serial data output from three or more channel cards by further comprising a fifth adder of ST: K, which finally adds the data output from the serial communication channel. Data com Inner unit.