KR100864012B1 - Scheduling error detecting and pdu encoding method in a node b of mobile communication system - Google Patents

Abstract

The present invention relates to a scheduling error detection and protocol data unit encoding technique in a mobile communication system base station, and establishes a call between a wireless network controller and a base station, updates system information, and transmits a broadcast channel protocol data unit for all single frequency networks in a base station. Initialize BCH PDU) and control information, detect scheduling information error of system information update according to segment type when combining system information for single frequency network, and encode system information broadcasting channel protocol data unit when no error occurs. Characterized in that. According to the present invention, when the base station detects the BCCH scheduling error due to the scheduling information error of the system information update when combining the system information, and detects this, by canceling the system information update for every single wireless network, the terminal has an error It is possible to prevent the generated BCH PDU from being transmitted and to prevent the service outage state of the terminal.

Broadcast Channel (BCH), ASN.1 Encoding, System Information

Description

Scheduling ERROR DETECTING AND PDU ENCODING METHOD IN A NODE B OF MOBILE COMMUNICATION SYSTEM}

1 is a block diagram showing the structure of a typical 3GPP system;

2 is a flowchart illustrating a BCCH scheduling error detection and BCH PDU encoding procedure according to a preferred embodiment of the present invention;

3 is a block diagram illustrating a structure of a BCH PDU and control information according to an embodiment of the present invention;

4 is a diagram illustrating SIB header information according to various segment types;

5 illustrates a BCH PDU encoding procedure according to a preferred embodiment of the present invention.

The present invention detects a scheduling error in a mobile communication system and BCH PDU (Broadcast Channel Protocol Data Unit) relates to an encoding method, and more particularly to a broadcast control channel from a base station of a ^{(THE 3 rd Generation Partnership Project)} 3GPP System (Broadcast Control A scheduling error detection of a channel (hereinafter referred to as BCCH) and a BCH PDU (Broadcast Channel Protocol Data Unit) encoding method.

In general, UMTS (Universal Mobile Telecommunications System) is a third generation mobile communication system that evolved from the European standard Global System for Mobile Communication (GSM), and based on GSM, WCDMA (Wideband) for a radio access network (RAN) It provides a variety of services by incorporating Code Division Multiple Access technology. The development of this standard specification of UTMS is made by a standardization organization called 3GPP. Therefore, 3GPP proposes a standard that is gradually developed to include more advanced functions, and the development stage of each standard is classified as Release (R).

1 is a block diagram showing the structure of a typical 3GPP system.

Referring to FIG. 1, reference numeral 10 is a core network (CN), 20 is a UMTS Terrestrial Radio Access Network (UTRAN), 30 is a RNS (Radio Network Subsystems), 31 is an RNC (Radio Network Controller), 32 is a base station (Node B), and 40 is a user element (UE).

As such, the UMTS system is mainly composed of the core network 10, the UTRAN 20, and the terminal 40, and the core network 10 includes call control, session management, and mobility control of subscribers. Management, and all network components related to switching within the network. Components of the core network 10 may be divided into nodes belonging to a circuit switched (CS) area, a packet switched (PS) area, and a register area. The circuit switched (CS) area consists of a Mobile Switching Center / Visitor Location Resister (MSC / VLR) and a Gateway Mobile Switching Center (GMSC), which can be physically located in the same equipment. The MSC / VLR manages circuit-switched connections and manages data security as well as mobility management, such as location update, location registration, and paging. The GMSC acts as a path through which the circuit switched area is connected to the external network.

The UTRAN 20 is connected to three core networks 10. Thus, the circuit switched is connected to the CS (Circuit Switched) domain (CS), the packet switched is connected to the PS (Packet Switched) domain, and the broadcast service is connected to the BC (Broadcasting) domain.

In the UTRAN 20, the RNC 31 controls the components in the RNS 30 to dynamically allocate radio resources of the UTRAN 20. In addition, the switching function transfers data transmitted through the UTRAN 20 to an appropriate node. Since the RNC 31 is directly connected to the core network 10, the RNC 31 performs a function of an access point of a service for all services provided through the core network 10.

In the UTRAN 20, the Node B 32 serves as a physical layer and is responsible for transmitting and receiving data through an air interface. The Node B 32 sets wireless physical channels necessary for data exchange with the terminal 40 according to the control information transmitted from the RNC 31, and converts the data transmitted from the upper protocol to the wireless environment to the terminal 40. To send). The data received from the terminal 40 is transmitted to the upper layer protocol of the RNC 31.

The terminal 40 includes a USIM (UTMS Subscriber Identity Module) card therein. The USIM card is a part for storing unique information of the user, and can be separated from the terminal 40, so a standard interface Cu is defined between the two. Although the USIM may be somewhat ambiguous, in actual implementations, the USIM may be implemented in the form of a physical IC card, which may include various applications or several USIM functions.

In addition, the 3GPP system includes a system information update procedure between the RNC 31 and the Node B 32 and a BCH PDU generation function based on the BCH scheduling information in the Node B 32. (3GPP TS 255.433 UTRAN Iub interface NBAP signaling, 3GPP TS 25.331 Radio Resource Control (RRC) protocol specification). In addition, the probability that the procedure succeeds without the length error of the BCH PDU depends on whether the scheduling algorithm in the RNC 31 has a length error detection method of the BCH PDU and whether the Node B 32 has an immediate error detection capability.

The System Information Update procedure performs the work required for Node B 32 to correctly schedule system information segments on the BCH. This procedure begins by the CRNC sending a System Information Update Request message to Node B 32. At this time, the Node B 32 should update the MIB / SB / SIB included in the System Information Update Request message on the BCH schedule.

Until the 3GPP system broadcasts to the terminal 40 through the RNC 31 and the Node B 32, the operations of 1) system information update, 2) system information BCH PDU generation, and 3) system information BCH PDU transmission are performed. . This is explained in turn as follows.

1) System Information Update Procedure

(Reference: 3GPP TS25.433 UTRAN Iub interface NBAP signaling)

This procedure is initiated with a System Information Update Request message of the RNC 31. System information includes one master information block (MIB), two scheduling blocks (SBs), and 27 system information blocks (SIBs).

This message includes segment information (Segment Type, Segment Length) of MIB / SB / SIB and scheduling information (IB_SG_REP, IB_SG_POS) indicating the transmission time of each segment.

If the Node B 32 can update a physical channel scheduling cycle with a parameter in the system information update request message, the Node B 32 notifies the RNC 31 of the system information update response message that it is successful and can update it. If not, the RNC 31 indicates a failure with a System Information Update Failure message.

2) Create system information BCH PDU

(Reference: 3GPP TS 25.331 Radio Resource Control (RRC) protocol)

The Node B 32 combines the information of the segmented system information block received by the system information update procedure, SFN, the combination type, and the segment length ( After attaching header information such as Segment Length), a system information BCH PDU of 246 bits to be transmitted to the terminal 40 is generated through ASN.1 (Abstract Syntax Notation One) encoding.

Segments can be defined in four different types:

First segment

Subsequent segment

Last segment

-Complete

The Node B 32 combines one or several segments of various lengths to generate system information BCH PDUs. The system information BCH PDUs can be defined in the following 11 different combination types.

-No segment

First segment

Subsequent segment

Last segment

-Last segment + First segment

-Last segment + one or several Complete

-Last segment + one or several Complete + First segment

-One or several complete

-One or several Complete + First segment

-One Complete of size 215 to 226

-Last segment of size 215 to 222

3) Send system information BCH PDU

(Reference: 3GPP TS 25.331 Radio Resource Control (RRC) protocol)

Node B 32 generates system information RRC PDUs generated by PCCPCH (Primary Common) according to scheduling information (IB_SEG_REP, IB_SEG_POS, SEG_COUNT) that informs the transmission time of each segment received by the System Information Update Procedure. It transmits to the terminal 40 every 20ms through the control physical channel) and the transmission time is as follows.

Send time (SFN) mod IB_SEG_REP = IB_SEG_POS (i) (with i = 0, 1, 2, SEG_COUNT-1)

At this time, each segment is repeatedly scheduled at the SFN position of a specific pattern according to IB_SEG_REP and IB_SEG_POS values, and different segments may be combined in a specific SFN.

However, in the prior art as described above, even though the RNC 31 transmits incorrect scheduling information to the Node B 32 as a system information update request message, the Node B 32 performs system information until ASN.1 encoding. If error detection of the BCH PDU is not possible, there is a risk that wrong system information is transmitted to the terminal 40. If the error is not immediately detected, the terminal 40 may fall into an out-of-service state. There is a problem that the overall reliability is reduced. Therefore, Node B 32 should be able to determine the system information scheduling information error, and if there is an error, the CRNC should inform the error.

In addition, Node B (32) is a method for representing the BCH PDU status information of each SFN with the smallest amount of information possible to efficiently generate the BCH PDU for all SFNs having a large range from 0 to 4094 and to deliver to the terminal 40 It was required, but there was no solution.

The present invention is to overcome the above limitations of the prior art, despite the incorrect scheduling information is transmitted to the base station (Node B) in the system information update request message, as it is encoded as it is transmitted to the terminal, the terminal is out of service The purpose of the present invention is to provide a scheduling error detection and encoding method of a protocol data unit in a base station of a mobile communication system capable of detecting a BCCH scheduling error at a base station and performing encoding only when there is no error. .

Another object of the present invention is to immediately detect a BCCH scheduling error due to a scheduling information error of a system information update when a base station of a mobile communication system combines the system information, and if it detects this, cancels system information update for every single wireless network. Accordingly, the scheduling error detection and protocol data unit encoding method in the base station of the mobile communication system that can prevent the transmission of the error BCH PDU to the terminal.

In one aspect of the present invention, to achieve the above technical problem, the protocol data unit encoding method according to the present invention (a) establishes a call between the radio network controller and the base station and performs system information update, and in the base station Initializing broadcast channel protocol data unit (BCH PDU) and control information for all single frequency networks (SFN), (b) scheduling information error of system information update according to segment type when combining system information for the single frequency network Detecting an occurrence, (c) encoding a system information broadcast channel protocol data unit when an error does not occur in the step (b).

In another aspect of the present invention, (a) establishing a call between a radio network controller and a base station and performing system information update, and broadcast channel protocol data unit (BCH PDU) for every single frequency network (SFN) at the base station; And initializing control information; (b) monitoring occurrence of scheduling information error of system information update according to segment type when combining system information with respect to the single frequency network; and (c) error in step (b). If is not generated, encoding the system information broadcast channel protocol data unit; and (d) after encoding the broadcast channel protocol data unit, the broadcast channel protocol data unit corresponding to every single frequency network in which one or more segments are combined. Checking the size of the signal and (e) checking the broadcast channel protocol as a result of the check in step (d). If the size of the data unit group or more settings size, and a step of transmitting to the terminal along the system information broadcast channel protocol data unit encoded in the step (c) in the single frequency network.

Hereinafter, the operating principle of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, when it is determined that a detailed description of a known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to intentions or customs of users or operators. Therefore, the definition should be made based on the contents throughout the specification.

The present invention monitors the BCCH scheduling error due to scheduling information error of the system information update when the base station of the mobile communication system is combined, and when monitoring the scheduling error, cancels the system information update for every single wireless network, This is to prevent BCH PDUs with errors from being sent.

First, the system information scheduling information received from the system information update request message by the base station Node B is as follows.

IB Type is an index representing [0 ~ 29] MIB (Master Information Block), two SBs (Scheduling Block), 27 SIBs (System Information Block), IB Occurrence Index: [0 ~ 15] Index.

For each IB Occurrence, IB_SEG_REP represents the repetition period of the segment and IB_SEG_COUNT represents the number of segments.

Further, for each IB segment, IB_SEG_POS indicates the segment position on the SFN, and this segment is scheduled on the SFN that satisfies SFN mod IB_SEG_REP = IB_SEG_POS.

Respectively, IB_SEG_TYPE represents a segment type of [0 to 6], IB_SEG_LENGTH represents a segment length, and IB_SEG_DATA represents segment data.

The Node B encodes the BCH PDU including the system information using the above information and then transmits the BCH PDU to the UE in the corresponding single frequency network (SFN).

In the present invention, BCH PDU storage space and BCH PDU control information storage space corresponding to all SFNs are provided for BCH PDU encoding. The BCH PDU storage space for one SFN consists of 246 bits. In addition, in order to indicate the status information of the BCH PDU encoded in each SFN, three bytes of control information were further configured as follows. Three bytes of control information are firstSegStartPos, lastSegSize, and totalBitSize.

Here, firstSegStartPos indicates the presence and position of the first segment on the BCH PDU, lastSegSize indicates the presence and size of the last segment, and totalBitSize indicates the total size of the currently encoded BCH PDU. . In the case of the first segment, when combined with another segment, it must always be located after the other segment. Therefore, the position of the first segment can be known as the start position of the first segment. Also, for the last segment, when encoded in combination with another segment, it must always be located ahead of the other segment (starting at the 15-bit position). Therefore, since the starting position of the last segment is fixed, lastSegSize can accurately represent the position information of the last segment.

Therefore, scheduling information error and BCH PDU encoding can be efficiently performed simply by using the following information.

The three-byte control information, firstSegStartPos, lastSegSize, and totalBitSize, will be described in detail as follows.

firstSegStartPos: [8bits] If the first segment is present in the BCH PDU of the SFN, this indicates a start bit position of the first segment. Otherwise, it is set to 0.

lastSegSize: [8bits] If the last segment exists in the BCH PDU of the SFN, this indicates the bit size of the last segment. Otherwise, it is set to 0.

totalBitSize: [8bits] The bit size of the BCH PDU currently configured in the BCH PDU of the SFN.

2 is a flowchart illustrating a BCCH scheduling error detection and BCH PDU encoding procedure according to a preferred embodiment of the present invention.

Referring to FIG. 2, in step 202, the Node B receiving the system information update request message from the RNC generates new system information on every single frequency network (SFN). That is, BCH PDU and control information is initialized for all single frequency networks (SFN).

FIG. 3 is a diagram illustrating the structure of a BCH PDU and control information. Referring to FIG. 3, the SFN prime of the BCH PDU is an SFN / 2 value, and the combination type is 11 types (No segment (300). ), First segment (302), Subsequent segment (304), Last segment (306), Last segment + First segment (308), Last segment + one or several Complete (310), Last segment + one or several Complete + First segment (312), One or several Complete (314), One or several Complete + First segment (316), One Complete of size 215 to 226 (318), Last segment of size 215 to 222 (320)) Is encoded.

In this case, in step 204, the segment is initialized to the state (NoSegment) 300 of the 11 combination types (300 to 320) as described above. Initialize to lastSegSize = 0, firstSegStartPos = 0 (no segment initially) and totalBitSize = 15 (11 bits for SFN prime, 4 bits for combination type) of BCH PDU control information. If the segment is not scheduled in the BCH PDU corresponding to the SFN, this BCH PDU will be transmitted to the terminal in the form of initialized Nosegment.

The current segment information is loaded in step 206 for all IB occurrence index segments of the IB type, and in step 208, SFN = IB_SEG_POS. Thereafter, in step 210, the BCH PDU corresponding to the set SFN is checked for scheduling information error of the system information update according to each segment type as follows.

To this end, as shown in FIG. 4, which shows SIB header information according to various segment types, the SIB header size according to each segment type is defined. The BCH PDU size is calculated as follows.

BCH PDU Size = totalBitSize + sibHdrSize + IB_SEG_LENGTH

Here, sibHdrSize is a size of a predefined SIB header according to each segment as shown in FIG. 4.

As shown below, the scheduling information error is checked according to each segment type.

(1) When the segment type is SEG_TYPE_FIRST (400), SEG_TYPE_SUBSEQUENT (404), SEG_TYPE_LAST (406), and SEG_TYPE_COMPLETE_SIB (410), it is checked whether the BCH PDU control information is the same as the initialization information as follows.

firstSegStartPos = 0

lastSegSize = 0

totalBitSize = 15

Then check for length errors as follows:

BCH PDU Length Calculated Above = 246 bits

The segment type has a fixed data size and must be transmitted by occupying all of the BCH PDUs. Therefore, if a segment is already allocated or the size of the BCH PDU is not 246 bits, it is determined that there is an error in the scheduling information.

(2) When the segment type is SEG_TYPE_FIRST_SHORT 402, when the value of firstSegStartPos is not "0", it means that the first segment is already scheduled, and it is determined that there is an error in the scheduling information. Then check for length errors as follows:

Calculated BCH PDU Size <= 246bits

0 <IB_SEG_LENGTH <215

(3) If the segment type is SEG_TYPE_LAST_SHORT 408, if lastSegSize is not "0", it means that the last segment is already scheduled, and it is determined that there is an error in the scheduling information. Then check for length errors as follows:

Calculated BCH PDU Size <= 246bits

0 <IB_SEG_LENGTH <215

(4) When the segment type is SEG_TYPE_COMP_SIB_SHORT 412, since it can be combined with a segment of any segment type, only the length error is checked as follows.

Calculated BCH PDU Size <= 246bits

0 <IB_SEG_LENGTH <215

If the scheduling information error check of the system information update is not passed in step 212 through the error checking in step 210, the scheduling error exists. In operation 216, the BCCH scheduling error is transmitted to the RNC. At this time, the Node B does not transmit the faulty BCH PDU to the terminal to prevent the risk of transmitting wrong system information to the terminal in advance.

However, if the scheduling information error check of the system information update is passed in step 212, the controller proceeds to step 218 to perform error-free BCH scheduling on the current SFN using the scheduling information.

In the present invention, in order to efficiently perform BCH PDU encoding, the following two parameters are introduced in addition to the BCH PDU control information. The BCH PDU control information is stored for the case where other segments are combined in the corresponding SFN and affects future BCH PDU encoding, but the following two parameters are not stored and only affect the current BCH PDU encoding.

newSegAddPos is a bit position to add a current segment to a BCH PDU of a corresponding SFN, and preSegShiftOffset corresponds to a bit value indicating how much to shift a segment already existing in a BCH PDU of a corresponding SFN to the right. .

In the present invention, BCH PDU encoding is performed in the following order.

1) If Segment Type = SEG_TYPE_FIRST, SEG_TYPE_SUBSEQUENT, SEG_TYPE_LAST or SEG_TYPE_COMPLETE_SIB (when it has a fixed data length, only one segment is encoded in one BCH PDU)

(1) Set the combination type. FirstSegment, SubsequentSegment, LastSegment, or CompleteSIB is set in turn according to each segment type.

(2) The control information totalBitSize is set to 246.

(3) Since only one segment is encoded in one BCH PDU, these segments set encoding information as follows.

newSegAddPos is set to 15 (the default).

preSegShiftOffset is set to 0.

2) If Segment Type = SEG_TYPE_FIRST_SHORT,

(1) Set a new combination type according to the existing combination type as follows.

In case of existing NoSegment, set combination type = FirstSegment

If existing LastSegmentShort, set combination type = LastAndFirst

If existing CompleteSIBList, set combination type = CompleteAndFirst

For existing LastAndComplete, set combination type = LastAndCompleteAndFirst

(2) Update control information as follows.

If the first segment is to be combined with another segment and encoded, it must always be located after the other segment, so set the firstSegStartPos value to totalBitSize.

Increase totalBitSize by (SibHdrSize + IB_SEG_LENGTH).

(3) Set encoding information as follows.

Set the newSegAddPos to "firstSegStartPos" because the first segment should always be located after other segments.

preSegShiftOffset is set to "0".

3) If Segment Type = SEG_TYPE_LAST_SHORT,

(1) Set a new combination type according to the existing combination type as follows.

In case of existing NoSegment, set combination type = LastSegment

If existing FirstSegment, set combination type = LastAndFirst

If existing CompleteSIBList, set combination type = LastAndComplete

If existing CompleteAndFirst, set combination type = LastAndCompleteAndFirst

(2) Update control information as follows.

lastSegSizes is set to "SibHdrSize + IB_SEG_LENGTH".

totalBitSize is increased by "lastSegSize".

(3) Set encoding information as follows.

Set the newSegAddPos to "15 (initial value)" because the last segment must always be joined at a fixed position.

If another segment already exists in the BCH PDU, preSegShiftOffset is set to "lastSegSize" to allow the existing segments to shift to the right.

4) If Segment Type = SEG_TYPE_COMPLETE_SIB_SHORT,

(1) Set a new combination type according to the existing combination type as follows.

In case of existing NoSegment, set combination type = CompleteSIBList

If existing FirstSegment, set combination type = CompleteAndFirst

For existing LastSegment, set combination type = LastAndComplete

For existing LastAndFirst, set combination type = LastAndCompleteAndFirst

(2) Set encoding information as follows.

When firstSegStartPos is "0", newSegAddPos is set to "totalBitSize" and preSegShiftOffset value is set to "0" because it is possible to combine segments after existing BCH PDU information.

If firstSegStartPos is not "0", first segment exists in the existing BCH PDU, so the segment must be combined before the firstSegment, so newSegAddPos is set to "firstBitStartPos" and preSegShiftOffset is set to "SibHdrSize + IB_SEG_LENGTH".

(3) Update control information as follows.

If firstSegStartPos is not "0", increment it by "preSegShiftOffset".

totalBitSize is increased by "preSegShiftOffset".

After calculating all the parameters as above, first shift the segment of the newSegAddPos position in the existing BCH PDU to the right by preSegShiftOffset, and insert the current segment into the newSegAddPos position.

5 is a diagram illustrating a process of encoding a combination type by changing the combination type from FirstSegment to LastAndFirst by applying the encoding method.

Referring to FIG. 5, when the segment type is SEG_TYPE_FIRST_SHORT in step 500 to perform BCH PDU encoding, the combination type is set to FirstSegment and the control information totalBitSize is set to 246. In step 502, the segment type to be added is SEG_TYPE_LAST_SHORT, so the new combination type is set to LastAndFirst in the existing combination type FirstSegment.

In step 504, encoding information newSegAddPos is set to 15 and preSegShiftOffset is set to 0. Thereafter, in step 506, the segment between the previously encoded newSegAddPos and preSegShiftOffset is shifted to the right by preSegShiftOffset, and the segment to be added in step 508 to step 502 is inserted into the newSegAddPos position to complete the encoding.

If the encoding of the BCH PDU is completed in step 218, the SFN is increased by IB_SEG_REP in step 220. If the SFN value is smaller than 4096 in step 222, the process repeats from step 210.

If the BCH PDU encoding is performed for all SFNs and the SFN value is 4096, the flow proceeds to step 224 to check whether the totalBitSize of the control information is 246 bits for the BCH PDU having one or more segments combined for all SFNs do. If the BCH PDUs are combined, the totalBitSize can be confirmed only after performing BCH encoding on all IB occurrence index segments. This is because there is an opportunity for other segments to be combined in a BCH PDU that has not yet been filled with 246 bits. If there is a case, Node B proceeds to step 214 to cancel the system information update for all SFN, and transmits the BCCH scheduling error to the RNC in step 216.

However, if the BCH PDUs are generated for all SFNs without error in step 224, the Node B transmits the BCH PDUs to the UE every 20ms through the PCCPCH (Primary Common Control Physical Channel) in step 226.

As described above, the present invention monitors the BCCH scheduling error due to scheduling information error of the system information update when the base station of the mobile communication system combines the system information, and if the scheduling error is detected, the system information for every single wireless network. By canceling the update, it is possible to prevent the BCH PDU having an error from being transmitted to the UE.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by those equivalent to the scope of the claims.

In the present invention operating as described in detail above, the effects obtained by the representative ones of the disclosed inventions will be briefly described as follows.

According to the present invention, when a base station detects a BCCH scheduling error due to a scheduling information error of a system information update when the base station combines the system information, and detects it, the system information update for every single wireless network is canceled, thereby causing an error in the terminal. It is possible to prevent the BCH PDU from being transmitted and to prevent a service unavailable state of the terminal.

Claims (13)

(a) establishing a call between the radio network controller and the base station, performing system information update, and initializing a broadcast channel protocol data unit (BCH PDU) and control information for every single frequency network (SFN) at the base station; , (b) monitoring occurrence of scheduling information error of system information update according to segment type when combining system information with respect to the single frequency network; (c) encoding a system information broadcast channel protocol data unit when no error occurs in step (b). Scheduling error detection and encoding method of the protocol data unit in the base station of the mobile communication system comprising a. The method of claim 1, The method, (d) if an error occurs in step (b), canceling system information updates for all single frequency networks, and transmitting a BCCH scheduling error to the radio network controller. A scheduling error detection and encoding method of a protocol data unit in a base station of a mobile communication system. The method according to claim 1 or 2, The method, (e) if no error occurs in step (b), checking the size of a broadcast channel protocol data unit corresponding to every single frequency network in which one or more segments are combined; (f) if the size of the broadcast channel protocol data unit is a preset size as a result of checking in the step (e), the system information broadcast channel protocol data unit encoded in the step (c) according to the single frequency network And transmitting to the terminal, the scheduling error detection and encoding method of the protocol data unit in the base station of the mobile communication system. The method of claim 3, wherein The size of the preset broadcast channel protocol data unit is A scheduling error detection and encoding method of a protocol data unit in a base station of a mobile communication system, characterized in that 246 bits. The method of claim 1, The single frequency network, Control information for indicating status information of the encoded broadcast channel protocol data unit, comprising: first control information (firstSegStartPos) indicating whether a first segment of the broadcast channel protocol data unit exists or not; Second control information (lastSegSize) indicating whether a last segment of the broadcast channel protocol data unit exists and is located; And And scheduling information corresponding to third control information (totalBitSize) indicating the total encoded size of the broadcast channel protocol data unit. The method of claim 5, wherein Initializing the broadcast channel protocol data unit and control information, For all the single frequency networks, the single frequency network prime of the broadcast channel protocol data unit is set to a SFN / 2 value, and the combination type is initialized to a no segment (NoSegment), The 3-byte control information initializes the first control information and the second control information to 0 and initializes the third control information to 15. The scheduling error detection and encoding of the protocol data unit in the base station of the mobile communication system Way. The method of claim 1, In step (c), When the segment type of the broadcast channel protocol data unit is a first type (SEG_TYPE_FIRST, SEG_TYPE_SUBSEQUENT, SEG_TYPE_LAST, SEG_TYPE_COMPLETE_SIB), If you are of type 2 (SEG_TYPE_FIRST_SHORT), For the third type (SEG_TYPE_LAST_SHORT) and The encoding error detection and encoding method of the protocol data unit in the base station of the mobile communication system, characterized in that the encoding is performed differently according to the case of the fourth type (SEG_TYPE_COMPLETE_SIB_SHORT). The method of claim 1, Step (c) is A first parameter (newSegAddPos) field indicating a position to add a current segment to the broadcast channel protocol data unit of the single frequency network; And And a second parameter (preSegShiftOffset) field indicating how many bits to shift the segment already existing in the broadcast channel protocol data unit as a control parameter for the encoding. Error detection and encoding of protocol data units. (a) establishing a call between the radio network controller and the base station, performing system information update, and initializing a broadcast channel protocol data unit (BCH PDU) and control information for every single frequency network (SFN) at the base station; , (b) monitoring occurrence of scheduling information error of system information update according to segment type when combining system information with respect to the single frequency network; (c) encoding a system information broadcast channel protocol data unit when no error occurs in step (b); (d) After encoding of the broadcast channel protocol data unit, if the value increased by the number of repetitions of error checking for each segment in the single frequency network is equal to a preset value, it corresponds to all single frequency networks in which one or more segments are combined. Checking the size of a broadcast channel protocol data unit; (e) If the size of the broadcast channel protocol data unit is greater than or equal to a preset size as a result of the checking in step (d), the system information broadcast channel protocol data unit encoded in step (c) is performed according to the single frequency network. Sending to Scheduling error detection and encoding method of the protocol data unit in the base station of the mobile communication system comprising a. The method of claim 9, The size of the preset broadcast channel protocol data unit is A scheduling error detection and encoding method of a protocol data unit in a base station of a mobile communication system, characterized in that 246 bits. The method of claim 9, The method, (f) if an error occurs in step (b), canceling system information updates for all the single frequency networks, and transmitting a broadcast control channel scheduling error to the radio network controller. A method for detecting scheduling error and encoding protocol data unit in a base station of a mobile communication system. The method of claim 9, In step (d), When encoding the broadcast channel protocol data unit, if the value increased by the number of repetitions of error checking for each segment in the single frequency network is smaller than a preset value, the scheduling information error is checked again. A scheduling error detection and encoding method of a protocol data unit in a base station of a mobile communication system. The method of claim 12, The preset value is 4096, the scheduling error detection and encoding method of the protocol data unit in the base station of the mobile communication system.

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