KR20030037822A - Method for Communication between Master and Slave in Basestation - Google Patents

Abstract

PURPOSE: An inter-board communication method in a base station of next generation mobile communication system is provided to make a smooth multi-communication between a master and a slave by allowing the master to manage interrupts coming in from each slave. CONSTITUTION: An interrupt table(I2TT) and a table(T2RT) are initialized and every value is cleared(201). It is checked whether an interrupt signal has been received from a slave(202). If no interrupt signal has been received, it is checked whether a data has been received from the slave(203). If no data has been received from the slave, it is checked whether every slave flag of the T2RT has been cleared(204). If every slave flag of the T2RT has been cleared, a slave with the longest time is searched from the I2TT(205). A token is transmitted to the slave with the longest time and a flag set time of the slave is increased in the T2RT(206). If not every slave flag of the T2RT has been cleared, a slave with the longest time is searched from the T2RT(210) and it is checked whether a re-transmission counter of the slave is less than 3(211). If the re-transmission counter is less than 3, it is checked whether 3 seconds has passed(212). If 3 seconds has passed, a token is re-transmitted to the slave(213).

Description

Board-to-board communication method in next-generation mobile communication system base station {Method for Communication between Master and Slave in Basestation}

The present invention is a master of a synchronous HDLC (Synchronous) high level data link control (HDLC) protocol used as a board-to-board communication means of a base station in a next generation mobile communication system (hereinafter, referred to as an "IMT-2000 system"). The present invention relates to a board-to-board communication method in a next-generation mobile communication system base station for enabling communication between a multi-slave and a multi-slave, and a computer-readable recording medium recording a program for realizing the method.

In the IMT-2000 system base station control board, there are signal lines for communicating with a plurality of lower boards. Instead of the plurality of signal lines, a method in which lower boards share signal lines by using one signal line is called a multi drop.

Since the multi-drop communication method is a method of transmitting and receiving data by sharing a single data line with a plurality of users, the number of physical cables is reduced. However, there are the following problems in implementing a multi-drop communication method.

That is, when a plurality of slaves are authorized to transmit and receive data to and from the master, the master generally uses a token ring method in which the master throws tokens sequentially to lower slaves to admit the data. However, there is a problem of time delay in the token ring method in which tokens are thrown at every slave.

The present invention has been proposed to solve the above problems, and is a master of synchronous High Level Data Link Control (HDLC) protocol used as a board-to-board communication means in a base station of a next-generation mobile communication system. Next-generation communication between Master and Multi Slave enables Master to perform smooth multi-communication between Master and Slave by managing interrupts from each slave with token allocation table. It is an object of the present invention to provide a method for inter-board communication in a mobile communication system base station and a computer-readable recording medium recording a program for realizing the method.

1 is an exemplary configuration diagram of a board in a base station in a next generation mobile communication system to which the present invention is applied.

2 is a flowchart illustrating an embodiment of a board-to-board communication method in a next-generation mobile communication system base station according to the present invention.

* Explanation of symbols for the main parts of the drawings

101: Master 102: OR-Gate

103: transmission line (Tx +, Tx-) 104: reception line (Rx +, Rx-)

111 ~ 114: Slave

The method of the present invention for achieving the above object, in the next-generation mobile communication system in the board-to-board communication method, the response from the slave to which the interrupt table (I2TT) and token allocation for token allocation in the master (Master) A first step of initializing a table (T2RT) for retransmission and clearing all values in the master when there is no information; A second step of leaving a record of interrupt signal reception in the I2TT upon receipt of an interrupt signal from a slave in which a data transmission / reception intention has occurred; A third step of resetting a token to the slave upon receipt of data from the slave; And a fourth step of allocating a token to the slave with reference to the I2TT and the T2RT when data is not received from the slave.

On the other hand, the present invention, from the slave to which the token is assigned to the base station apparatus having a processor for the board-to-board communication in the next-generation mobile communication system base station, the interrupt table (I2TT) for token allocation in the master A first function of initializing a table (T2RT) for retransmission and clearing all values in the master when there is no response; A second function of leaving a record of the interrupt signal reception in the I2TT upon receiving an interrupt signal from a slave in which a data transmission / reception intention has occurred; A third function of resetting a token to the slave upon receipt of data from the slave; And a computer-readable recording medium having recorded thereon a program for realizing a fourth function of allocating a token to the slave with reference to the I2TT and the T2RT when data is not received from the slave.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an exemplary configuration diagram of a board in a base station in a next generation mobile communication system to which the present invention is applied.

In the drawing, "101" is a master, "102" is an OR-Gate, "103" is a transmission line (Tx +, Tx-), "104" is a reception line (Rx +, Rx-), And "111-114" represents a slave (Slave), respectively.

In the next generation mobile communication system to which the present invention is applied, the board in the base station includes one master 101 and four slaves 111 to 114. Here, the number of slaves 111 to 114 is illustrated as four to explain the present invention, and the number may vary.

In the system, each board sends and receives High Level Data Link Control (HDLC) protocol messages through receive lines (Rx +, Rx-) 104 and transmit lines (Tx +, Tx-) 103 of "RS-485" standard. The master 101 receives interrupt requests from the slaves 111 to 114 through the logic combiner 102 in the " RS-485 " standard. Here, "Recommend Standarded-485 cable (RS-485)" is a Telecommunications Industries Association (TIA) / Electronic Industries Association (EIA) standard for a multipoint communication line. It supports connectors like "DB-9" or "DB-37".

In the next generation mobile communication system base station control board, there are signal lines for communicating with a plurality of lower boards. Instead of the plurality of signal lines, a method in which lower boards share signal lines by using one signal line is called a multi drop. In the multi drop communication method, a single data line is shared by a plurality of users to transmit and receive data. As a result, the number of physical cables is reduced.

In the board-to-board communication method in the next-generation mobile communication system base station according to the present invention, the following method is proposed.

First, a plurality of slaves 111 to 114 are authorized to transmit and receive data to and from the master 101. In general, the master 101 uses a token ring method in which tokens are sequentially thrown to the lower slaves 111 to 114 to transmit and receive data. The present invention proposes an interrupt scheme, which can solve the time delay problem that may occur in the token ring scheme. In other words, if the slaves 111 to 114 having the intention to transmit / receive data transmit an interrupt signal to the upper master 101 and the master 101 uses a token to implement this, the slaves 111 to 114 for each slave 111 to 114. ) Can have an advantage over the token ring method of throwing tokens in chronological order.

Secondly, when interrupts are sent from the lower slaves 111-114 at about the same time, the master manages the tables in order of high priority so that the lower slaves 111-114 transmit and wait only once for the interrupt. The way is to apply. If the lower slaves 111 to 114 have the same priority, the table is managed in chronological order of interrupts received by the master 101. If the table management is not performed in the master 101, the lower slaves 111 to 114 have a burden of periodically transmitting an interrupt until they are authorized to transmit and receive data. More burdensome.

The third relates to the method of table management in the master 101. The table is divided into two, divided into a first table for managing time in the order of interrupts for token allocation and a second table for retransmission when there is no response from the token-assigned slaves 111 to 114. . The number of retransmissions is basically performed three times. If there is no response from the slave even during three retransmissions, a failure is processed and the next rank in the table is authorized. The number of retransmissions can be changed in accordance with the situation of the system.

That is, in order to solve the above proposal, the master 101 in the IMT-2000 system for communication between the board in the base station in the communication between the master 101 and slaves from each of the slave (111 ~ 114) Receive interrupts and give tokens. At the same time, tokens are properly managed when interrupts come in or interrupts occur from one slave during communication with one slave.

Accordingly, the master 101 allocates tokens and manages interrupts from the slaves 111 to 114 with the table to perform smooth multi-communication between the master 101 and the slaves 111 to 114.

That is, the present invention writes the table in the order in which interrupts are generated from the slaves 111 to 114, and if there is no response from the slaves 111 to 114 until a certain time after the priority table for allocating tokens, It has a ReTrans table that retransmits tokens repeatedly up to a number of times, and does not drop tokens while communicating with other slaves 111-114, and interrupts coming from the same slave only once after the ongoing communication ends. To avoid double processing for the same interrupt after communication with one slave.

2 is a flowchart illustrating a board-to-board communication method in a next-generation mobile communication system base station according to the present invention.

First, Interrupt to Token Table (hereinafter referred to as "I2TT") and Token allocating tokens for determining the priority of the interrupt first time for token allocation as shown in [Table 1] When there is no response from the network, a table for retransmission (Token to Rx Table: referred to as "T2RT") is required.

Slave time Flag One 00:33:02 ② 0 → 1① → 0⑥ 2 00:33:04 ④ 0 → 1③ → 0⑧ 3 0 4 0

Slave time Flag Retrans Count One 00:33:06 0 → 1⑤ → 0⑥ 2 00: 33: 08⑦ → 00: 33: 11⑨ 0 → 1⑦ → 0⑧ 0 → 1⑩ 3 0 4 0

Tables 1 and 2 are provided, and a board-to-board communication method in a next-generation mobile communication system base station according to the present invention will be described with reference to FIG. 2 as follows.

First, I2TT and T2RT are initialized and all values are cleared (201).

Then, it is checked whether the interrupt signal is received from the slave (202).

If it is determined that the interrupt signal is not received from the slave, it is determined whether data is received from the slave (203).

As a result of the check, if an interrupt signal is received from the slave, checking whether the flag of the slave is set in the I2TT (207), and if it is set, determining whether data is received from the slave ( In step 203, if not set, the slave flag set time is recorded in the I2TT, the time is increased, and the process proceeds to step 203 in which it is determined whether data has been received.

As a result of the determination (203), if the data is received from the slave, the process clears the I2TT and T2RT values to reset the slave token and confirms whether an interrupt signal is received from the slave (202). Proceed to

As a result of the determination (203), if no data is received from the slave, it is checked whether all slave flags (Flag) of the T2RT are cleared (204).

As a result of the check, if all slave flags of the T2RT are cleared, the slave having the oldest time in the I2TT is searched for (205) and the token is transmitted to the slave, and the slave is transmitted from the T2RT. After increasing the flag set time, the process proceeds to step 202 to determine whether an interrupt signal is received from the slave.

As a result of the check 204, if all slave flags of the T2RT are not cleared, the slave having the oldest time in the T2RT is searched (210) to determine whether the retransmission counter of the slave is less than three. Check (211).

As a result of the check, if it is less than 3, it is checked whether the time exceeds 3 seconds (212). If it is more than 3 seconds, the token is retransmitted to the slave (213) and the process of checking whether an interrupt signal is received from the slave (step 202) If more than 3 seconds is exceeded, the process proceeds to step 202 to check whether an interrupt signal is received from the slave.

As a result of the check, if the value is 3 or more, the process proceeds to step 209 of resetting the token of the slave.

The above process is described with reference to FIG. 1, Table 1, and Table 2 as an example.

If interrupt occurs from channel 1 during the slave, set flag as ① in I2TT table of [Table 1] and increase it while recording time as ②.

If an interrupt is generated from the same channel after that, if the flag of the corresponding channel of I2TT in [Table 1] is still set, do not perform the same process as the procedure ③ and ④ of channel 2 to prevent double processing. .

[Table 2] Check if all channel flags are cleared in T2RT table, and if cleared, refer to the time of I2TT table in [Table 1] to allocate token to the corresponding channel. Find the channel and allocate token, set the flag of T2RT table of [Table 2] as ⑤ and record and increase the time for retransmission.

If at least one flag of each channel is set in the procedure ⑤ of T2RT, it is determined that the retransmission procedure is still being performed, and it is less than 3 times referring to the retransmission count of the corresponding channel of the T2RT table of [Table 2]. If 3 seconds have passed after checking if the time has passed, send the token to the corresponding channel, and increase the retrans count as ⑩.

If the repeat count is repeated more than 3 times, clear the time and flag of the corresponding channel in the I2TT table of [Table 1] and the T2RT table of [Table 2] as shown in ⑥, and again until the interrupt request is made. Do not assign

After the above process is completed, the interrupt processing of channel 2 in the I2TT table of [Table 1] is repeated until the above procedures ③ to ⑧.

Similarly, tokens will continue to be allocated for the remaining channels in the same way as above.

As described above, the method of the present invention may be implemented as a program and stored in a recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto-optical disk, etc.) in a computer-readable form.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the art without departing from the technical spirit of the present invention. It will be apparent to those of ordinary knowledge.

As described above, the present invention is a method for inter-board communication in a base station in a next-generation mobile communication system, in which a master manages an interrupt coming from each slave with a token allocation table during communication between a master and a slave. There is an effect that enables seamless multi-communication between the and the slave.

Claims (5)

In the board-to-board communication method in the next-generation mobile communication system base station, A first table for initializing the interrupt table (I2TT) for token allocation in the master and the table (T2RT) for retransmission when there is no response from the slave to which the token is assigned, and clearing all values in the master. step; A second step of leaving a record of interrupt signal reception in the I2TT upon receipt of an interrupt signal from a slave in which a data transmission / reception intention has occurred; A third step of resetting a token to the slave upon receipt of data from the slave; And A fourth step of allocating a token to the slave with reference to the I2TT and the T2RT when no data is received from the slave; Board-to-board communication method comprising a. The method of claim 1, The process of checking whether the interrupt signal has been received from the slave in which the intention to transmit / receive data in the second step is A fifth step of checking whether a flag of the slave is set in the I2TT; A sixth step of proceeding to determining whether data has been received from the slave of the second step if it is set as a result of the checking of the fifth step; And As a result of the check in the fifth step, if not set, the slave flag set time is recorded in the I2TT, and after increasing the time, data from the slave in the second step is increased. Step 7 proceeds to the process of determining whether Board-to-board communication method comprising a. The method according to claim 1 or 2, The fourth step, An eighth step of checking whether all slave flags of the T2RT are cleared; As a result of the checking of the eighth step, if all the slave flags of the T2RT are cleared, the slave having the oldest time is searched for in the I2TT, and the token is transmitted to the slave. A ninth step of increasing a flag set time of the slave and then checking whether an interrupt signal is received from the slave of the second step; And As a result of the checking of the eighth step, if all slave flags of the T2RT are not cleared, the slave having the oldest time in the T2RT is searched to check the retransmission counter and time of the slave. Tenth step of retransmitting the slave token Board-to-board communication method comprising a. The method of claim 3, wherein The tenth step is An eleventh step of checking whether the retransmission counter is less than a predetermined number; As a result of the checking of the eleventh step, if the retransmission counter is less than a predetermined number, it is checked whether the predetermined time has been exceeded. A 12th step of proceeding to a process of checking whether the interrupt signal is received from the slave of the second step if not more than the predetermined time; And As a result of the checking of the eleventh step, if the retransmission counter is a predetermined number or more, the thirteenth step of proceeding to a process of resetting the token of the slave of the third step. Board-to-board communication method comprising a. In a base station apparatus equipped with a processor for board-to-board communication in a next-generation mobile communication system base station, A first table for initializing the interrupt table (I2TT) for token allocation in the master and the table (T2RT) for retransmission when there is no response from the slave to which the token is assigned, and clearing all values in the master. function; A second function of leaving a record of the interrupt signal reception in the I2TT upon receiving an interrupt signal from a slave in which a data transmission / reception intention has occurred; A third function of resetting a token to the slave upon receipt of data from the slave; And A fourth function of allocating a token to the slave with reference to the I2TT and the T2RT when data is not received from the slave A computer-readable recording medium having recorded thereon a program for realizing this.