KR20080071855A - Apparatus and method for receiving system information in wireless system - Google Patents

Abstract

An apparatus and a method for receiving system information in a mobile communication system are provided to receive scheduling information about plural system information blocks through a BCH and schedule the receiving point of time of a DL-SCH at which the system information blocks are transmitted from the received scheduling information in the BCH to receive the plural system information blocks. A method for receiving system information in a mobile communication system comprises the following steps of: decoding information received through a BCH(Broadcast Channel) channel in a predetermined bandwidth and a predetermined location of a frame(501); checking whether a CRC(Cyclic Redundancy Check) error occurs in the received information(503); acquiring information about the location of a frame to which each flexibility part system information are transmitted from the scheduling information of the received fixed part system information if it is checked that the CRC error does not occur(504); and receiving flexibility part system information transmitted from a DL-SCH(Downlink-Shared Channel) in a sub frame predefined in the frame(505).

Description

Apparatus and method for receiving system information in mobile communication system {APPARATUS AND METHOD FOR RECEIVING SYSTEM INFORMATION IN WIRELESS SYSTEM}

1 is a view showing an example in which system information is transmitted according to the prior art.

2 is a diagram illustrating an example of a structure of a next generation mobile communication system to which the present invention is applied;

3 is a diagram illustrating the type and transmission relationship of system information in the next generation mobile communication to which the present invention is applied;

4 is a diagram illustrating an example in which system information is transmitted according to a time concept in a next generation mobile communication technology to which the present invention is applied;

5 is a flowchart illustrating an example of receiving system information according to the first embodiment of the present invention.

6 is a flowchart illustrating an example of receiving system information according to a second embodiment of the present invention.

7 is a flowchart illustrating an example of receiving system information according to a third embodiment of the present invention.

8 is a flowchart illustrating an example of receiving system information according to a fourth embodiment of the present invention.

9 is a flowchart illustrating an example of receiving system information according to a fifth embodiment of the present invention.

10 is a diagram illustrating a structure of a user terminal to which the present invention is applied.

The present invention relates to a mobile communication system, and provides a receiving apparatus and method for receiving system information.

1 is a diagram illustrating an example in which system information is transmitted to a user terminal in a conventional UMTS system.

Referring to FIG. 1. In a conventional UMTS system, system information is transmitted by dividing up to 18 system information blocks. At this time, the user terminal performs a scheduling by checking a predetermined transport format (hereinafter, referred to as 'TF') through a broadcast channel (BCH), and transmits the 18 system information blocks according to the scheduling. Receive.

As described above, in the conventional UMTS system, system information blocks are transmitted through the BCH. The BCH is a broadcast channel through which all terminals in one cell perform decoding. Therefore, there is a problem in that techniques such as link adaptation and complex automatic retransmission (H-ARQ) cannot be performed. In addition, since all terminals in the cell have to perform decoding, there is a problem in that unnecessary transmission power is used.

Here, the Universal Mobile Telecommunication Service (UMTS) system is based on the Global System for Mobile Communications (GSM) and General Packet Radio Services (GPRS), which is a European mobile communication system, and has wideband code division multiple access (Code Division Multiple Access). : 3rd generation asynchronous mobile communication system using "CDMA".

On the other hand, the mobile communication system is currently discussing a next-generation mobile communication system based on the UMTS system, the discussion on how to transmit system information to the terminals in the cell in this next-generation system.

That is, a more efficient system information transmission method for the next generation mobile communication system is required.

Accordingly, the present invention devised to solve the problems of the prior art operating as described above is to provide a receiving apparatus and method for receiving system information.

The present invention also provides an apparatus for receiving, in a mobile communication system, scheduling information for system information blocks through a broadcast channel and receiving system information blocks transmitted through a downlink common channel according to the received scheduling information. In providing a method.

The present invention relates to a method for receiving system information in a mobile communication system, the method comprising: receiving scheduling information including position information of a frame of each of a plurality of system information blocks through a broadcast channel; In a subframe determined corresponding to each of the plurality of system information blocks in the same frame as the specific frame receiving the information or in an integer multiple of the specific frame, the terminal transitioning from the sleep state to the wake-up state is common to the downlink. Receiving a corresponding system information block through a channel.

The present invention provides a terminal device for receiving system information, comprising: a first receiving unit receiving scheduling information including transmission position information of each of a plurality of system information blocks through a broadcast channel, and through the first receiving unit; And a second receiver configured to receive a corresponding system information block through a downlink common channel at a transmission position determined according to the obtained scheduling information.

The present invention provides a base station method for transmitting system information blocks, the method comprising: transmitting a broadcast channel including scheduling information indicating a transmission position of a plurality of system information blocks in a cell to a terminal, and according to the scheduling information, And allocating the plurality of system information blocks to a downlink common channel and transmitting the same to the terminal.

Hereinafter, with reference to the accompanying drawings will be described in detail the operating principle of the preferred embodiment of the present invention. In the following description of the present invention, detailed descriptions of well-known functions or configurations will be omitted if it is determined that the detailed description of the present invention may unnecessarily obscure the subject matter of the present invention.

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.

Hereinafter, a 3GPP Long Term Evolution (LTE) system, which is a next generation mobile communication system evolved from a 3rd Generation Partnership Project (3GPP) Universal Mobile Telecommunication Service (UMTS) system, will be described. In addition, the present invention can be applied to other mobile communication systems in which at least one or more terminals in a cell transmit information commonly received in the cell.

As mentioned above, the 3rd Generation Partnership Project (3GPP), which is currently in charge of UMTS standardization, is discussing the Long Term Evolution (LTE) system as the next generation mobile communication system of the UMTS system.

LTE system is a technology that implements high-speed packet-based communication having a transmission rate of up to 100 Mbps with the aim of commercializing about 2010. To this end, various schemes are discussed. For example, a scheme of reducing the number of nodes located on a communication path by simplifying a network structure, or approaching wireless protocols as close as possible to a wireless channel are under discussion.

In this regard, first, FIG. 2 illustrates an example of a next generation mobile communication system structure to which the present invention is applied.

2, the Evolved UMTS Radio Access Network (hereinafter referred to as 'E-UTRAN') 210 may be referred to as an Evolved Node B (hereinafter referred to as 'ENB') (220, 222). It is simplified to a two node structure of 224, 226, 228 and anchor nodes 230, 232.

The user equipment (hereinafter referred to as "UE" or "terminal") 201 is connected to the Internet Protocol (hereinafter referred to as "IP") network by the E-UTRAN 210. The ENBs 220 to 228 correspond to existing Node Bs of the UMTS system and are connected to the UE 201 by a radio channel. Unlike the existing Node B, the ENBs 220 to 228 play a more complex role.

In the LTE system, all user traffic including a real-time service such as Voice over IP (VoIP) through the Internet protocol is to provide a service through a shared channel.

Therefore, there is a need for an apparatus for scheduling by gathering situation information of a plurality of UEs, which is handled by the ENBs 220 to 228. One ENB typically controls a number of cells. In addition, the ENB performs Adaptive Modulation & Coding (hereinafter, referred to as 'AMC') to determine a modulation scheme and a channel coding rate according to the channel state of the terminal.

In addition, services that support UMTS's High Speed Downlnk Packet Access (HSDPA) and High Speed Uplink Packet Access (HSUPA), or enhanced dedicated As in the system supporting the channel service (Enhanced Dedicated Channel, hereinafter referred to as 'E-DCH'), in the LTE system, a hybrid automatic retransmission scheme (Hybrid ARQ, hereinafter) between the ENBs 220 to 228 and the UE 201 is performed. `` HARQ '' will be performed.

In addition, since the HARQ alone cannot satisfy the requirements of various Quality of Service (QoS), an outer ARQ at the upper layer is between the terminal 201 and the ENBs 220 to 228. Can be performed.

The HARQ is a technique of increasing reception success rate by soft combining with retransmitted data without discarding previously received data. This is used to improve transmission efficiency in high speed packet communication such as HSDPA or EDCH.

In addition, in order to realize a transmission rate of up to 100Mbps, the LTE system is expected to use orthogonal frequency division multiplexing (OFDM) as a radio access technology in a 20 MHz bandwidth.

In this regard, it is intended to provide a method for a user terminal to more efficiently receive system information blocks transmitted for each cell in the OFDM-based LTE system. That is, to provide a system information receiving method applying HARQ to ensure the reliability of the system information blocks. In this case, scheduling information for each system information block is received through a broadcast channel.

The system information according to the present invention includes the transmission of the fixed part system information and the flexible part system information. At this time. The fixed part system information includes simpler system information, and is used as information indicating a scheduled situation of necessary system information in an actual cell.

Meanwhile, necessary system information blocks to be recognized between the network device and the receiving device are transmitted through flexible part system information.

Accordingly, the user terminal receives each of these distinct system information through a broadcast channel and a downlink shared channel. This is to propose a method of scheduling and receiving a reception time according to when each flexible part system information is received while minimizing signaling overhead.

3 is a diagram illustrating the type and transmission relationship of system information transmitted in the next generation mobile communication system according to the present invention.

Referring to FIG. 3, according to the present invention, system information includes a fixed part system information 301 to be transmitted through a broadcast channel (hereinafter referred to as 'BCH') 302 and the broadcast channel. This can be distinguished by the flexibility part system information 304 to be distinguished and transmitted on a downlink common channel (hereinafter referred to as 'DL-SCH' 305).

The transmission through the BCH 302 means information to be transmitted to all terminals in the cell, which means that the channel information uses a relatively high transmission power as compared to transmission of other channels.

On the other hand, the transmission through the DL-SCH 305 can be regarded as the same as the BCH 302 in terms of being transmitted to a plurality of terminals, the DL-SCH 305 is at least one or more in the same cell A shared channel shared by terminals, which is suitable for transmitting system information transmitted corresponding to a specific service. In addition, the transmit power of the DL-SCH 305 may consume less power than the BCH 302.

In particular, the DL-SCH 305 is a channel that can be transmitted by applying a hybrid automatic retransmission scheme (HARQ), and when the reliability of the system information in the cell is actually considered, it is transmitted through the DL-SCH 305. desirable.

In consideration of this point, the present invention provides scheduling information for indicating the time of transmission of the flexible part system information 304 transmitted to the DL-SCH 305 to the fixed part system information 301 transmitted to the BCH 302. 303 is transmitted. That is, each system information block 304 transmitted to the DL-SCH 305 is transmitted according to the scheduling information 303.

The system information block 304 means different types of flexible part system information, and up to eight flexible part system information will be transmitted according to an embodiment of the present invention. For example, each system information block includes cell identifier information of a current cell indicating cell information, frequency information, cell list information of neighboring cells, or the like, and channel information according to channel setting.

Accordingly, the present invention proposes a method of scheduling and receiving flexible part system information while minimizing signaling overhead according to scheduling of the BCH 302 when transmitting up to eight flexible part system information. .

4 is a diagram illustrating an example of system information transmitted over time in the next generation mobile communication technology to which the present invention is applied.

Referring to FIG. 4, first, one frame size is 10ms, and each frame is composed of 20 subframes having a length of 0.5ms.

Reference numeral '401' is fixed part system information transmitted according to predetermined scheduling information, and system information including scheduling information according to the present invention. The transmission period of the fixed part system information is 80 ms. That is, the fixed part system information has a transmission period of 80 ms and transmits scheduling information for system blocks including different system information.

The reference numerals '402', '403', and '404' indicate flexible part system information transmitted by changing a frame position and a sub frame position according to the scheduling information transmitted through the fixed part system information.

In FIG. 4, it is assumed that the transmission period of the flexible part system information 1 402 is T1 406, and the period of the flexible part system information 2 402 and the flexible part system information 3 403 is longer than T1. Assume that T2 (407). That is, the flexible part system information is transmitted at least once for a time of 640 ms.

That is, the fixed part system information is transmitted in an 80 ms transmission period, and the fixed part system information may be checked to obtain the position of the frame and the sub frame to which the actual flexible part system information is transmitted.

Accordingly, the user terminal decodes the received information transmitted with predetermined scheduling information, i.e., transmitted every 80 ms, checks scheduling information of the fixed part system information according to the decoding result, and then transmits the flexible part system information. The relative time distances 408 and 409, that is, the frame position information and the position information of the subframe are obtained.

<First Embodiment>

In the following first embodiment according to the present invention, the flexible part system information is transmitted in the same frame as the frame in which the fixed part system information is transmitted, and the subframe in which the flexible part system information is transmitted in one same frame. It is assumed that the location is predefined. The fixed part system information includes a type of each flexible part system information and a position of a frame to be transmitted.

5 is a flowchart of a first embodiment of a processing procedure of a terminal according to a method for scheduling system information according to the present invention.

Referring to FIG. 5, in operation 501, the user terminal decodes information received through a BCH channel at a predetermined bandwidth and a predetermined frame position.

In step 503, the user terminal determines whether a CRC error has occurred in the received information as a result of the decoding. In this case, when it is determined that a CRC error occurs, the user terminal determines that the received information is not fixed part system information, and proceeds to step 501. In step 501, the user terminal decodes the information received at the next predetermined frame position after 80ms in the predetermined bandwidth.

On the other hand, if it is determined that the CRC error does not occur as a result of the decoding, the terminal determines in step 503 that the decoded result is fixed part system information including scheduling information for system information blocks, and proceeds to step 504.

In operation 504, the user terminal obtains frame position information from which the flexible part system information (the same as the system information block, used in combination) is transmitted from the scheduling information of the received fixed part system information.

Table 1 below shows scheduling information included in fixed part system information acquired by a user terminal according to the first embodiment of the present invention. Here, the frame position information is a position of a frame corresponding to an 80 ms period of the fixed part system information.

Flexible Part System Information Frame position information # s1 0 # s2 One # s3 One # s4 4 # s5 2 ... ... #sN 5

Here, each of the different flexible part system information is defined as '#sN', and represents the number of types of N = 0, 1, 2, and 3 total system information. According to the first embodiment, each flexible part system information is transmitted at a predefined subframe position.

For example, assuming that the flexible part system information # s1 is transmitted in subframe # 13, # s1 continues to be transmitted in subframe # 13 thereafter. The different types of flexible part system information each have predefined subframe information, which may be the same other subframe or the same subframe.

In the first embodiment, the flexible part system information # s1 is subframe 13, the flexible part system information # s2 is subframe 10, the flexible part system information # s3 is subframe 7, and the flexible part system information # s4 is 15 It is assumed that subframe 1, flexible part system information # s4 is transmitted in subframe 4, and flexible part system information #sN is transmitted in subframe 18.

Accordingly, the user terminal may acquire # s1 from the preset subframe 13 of the same frame as the received fixed part system information (hereinafter, referred to as 'F0 frame'). # s2 may be obtained from subframe 10 of the F0 frame + 80ms of the F1 frame. # s3 may also be obtained from subframe # 7 of the F0 frame + 80ms of the F1 frame. # s4 may be obtained from subframe 15 of the F4 frame of the F0 frame + (80ms * 4). # s5 may be obtained from subframe 4 of the F2 frame of the F0 frame + (80ms * 2). #sN may be obtained from subframe 18 of the F5 frame of the F0 frame + (80ms * 5).

As described above, the frame position information to which the flexible part system information is transmitted is. It is represented by (frame number * 80ms) of flexible part system information transmitted from the frame from which the corresponding flexible part system information is transmitted until the next flexible part system information is transmitted.

In operation 505, the user terminal performs DL-SCH in a predefined subframe in the frame based on the information on the type of flexible part system information obtained above and the frame information on which the flexible part system information is transmitted. Receive flexible part system information sent through

As described above, according to the first embodiment, the user terminal checks scheduling information through the BCH to grasp different transmission frame positions of corresponding flexible part system information transmitted through the DL-SCH. Accordingly, the user terminal in the sleep state transitions from the transmission frame of the flexible part system information to the wake-up state and receives the system information through the DL-SCH.

The user terminal has an advantage of increasing the waiting time by controlling the sleep state and the wake up state and maintaining the wake up state in response to necessary system information without always maintaining the wake up state.

<< second embodiment >>

In the following second embodiment according to the present invention, the flexible part system information is transmitted in the same frame as the frame in which the fixed part system information is transmitted. Unlike the first embodiment, the flexible part system information is transmitted in one frame. It is assumed that the position of the subframe is not defined in advance. Accordingly, the fixed part system information includes a type of each flexible part system information and a frame position to be transmitted.

6 is a flowchart illustrating an example of receiving system information according to a second embodiment of the present invention.

Referring to FIG. 6, in step 601, a user terminal decodes information received through a BCH channel at a predetermined bandwidth and a predetermined location.

In operation 603, the user terminal performs the decoding to determine whether a CRC error has occurred in the received information. At this time, if it is determined that the CRC error occurs, it is determined that the fixed part system information of the corresponding user terminal is not, and the process proceeds to step 601 to continue decoding at a predetermined bandwidth and a predetermined position.

On the other hand, if it is determined in step 603 that a CRC error does not occur, it is determined that the decoded result is fixed part system information of the corresponding user terminal, and the flow proceeds to step 604.

In step 604, the user terminal obtains frame position information from which the flexible part system information is transmitted from the received fixed part system information.

Table 2 below shows scheduling information of fixed part system information acquired by the user terminal according to the second embodiment of the present invention.

Flexible Part System Information Frame position information # s1 0 # s2 One # s3 One # s4 4 # s5 2 ... ... #sN 5

Here, each of the different flexible part system information is defined as '#sN', wherein N = 0, 1, 2, 3,. Represents the number of types of total system information.

According to the second embodiment, the subframe position of the flexible part system information is not included. Accordingly, the user terminal decodes all subframes constituting the frame to obtain corresponding flexible part system information.

That is, # s1 is located in the same frame as the received fixed part system information (hereinafter referred to as 'F0 frame'). Accordingly, the user terminal sequentially decodes 20 subframes constituting the F0 frame to obtain # s1. For # s2, the user terminal sequentially decodes 20 subframes constituting the F1 frame of the F0 frame + 80ms to obtain the # s2. In this case, # s3 may also be obtained by sequentially decoding 20 subframes constituting the F1 frame. # s4 may be obtained by sequentially decoding subframes constituting the F4 frame of the F0 frame + (80ms * 4). # s5 may be obtained by sequentially decoding subframes constituting the F2 frame of the F0 frame + (80ms * 2). #sN may be obtained by sequentially decoding subframes of the F5 frame of the F0 frame + (80ms * 5).

As described above, in step 605, the user terminal transmits the information transmitted on the DL-SCH based on the information on the type of the flexible part system information obtained and the frame position information on which the flexible part system information is transmitted. Decoding is sequentially performed on all 20 subframes.

If a CRC error occurs as a result of the decoding in step 607, the process proceeds to step 605 to perform decoding at the next subframe position.

On the other hand, if the CRC error does not occur as a result of the decoding, in step 608 it is determined that the flexible part system information of the user terminal.

Third Embodiment

In the following third embodiment according to the present invention, the flexible part system information is transmitted in the same frame as the frame in which the fixed part system information is transmitted, and the position of the subframe in which the flexible part is transmitted in one frame is pre-set. Assume that it is not defined in. In this case, the fixed part system information includes a type of each flexible part system information, a transmission frame position of each flexible part system information, and position information of a subframe in which specific flexible part system information is located within one frame.

7 is a flowchart illustrating an example of receiving system information according to a third embodiment of the present invention.

Referring to FIG. 7, in step 701, a user terminal receives fixed part system information transmitted through a BCH channel at a predetermined bandwidth and a predetermined position and performs decoding.

In step 703, the user terminal performs the decoding to check whether a CRC error has occurred in the received information. At this time, if the CRC error occurs, it is determined that the fixed part system information of the user terminal is not, and proceeds to step 701 to continue decoding at a predetermined bandwidth and a predetermined position.

On the other hand, if it is determined in step 703 that no CRC error occurs, it is determined that the decoded result is fixed part system information of the user terminal, and the flow proceeds to step 704.

In operation 704, the user terminal obtains a frame position at which each flexible part system information is transmitted and position information of a subframe within the frame from the received fixed part system information.

The information about the frame position in which the flexible part system information is transmitted is represented by the number of fixed part system information transmitted from the frame from which the flexible part system information is transmitted until the next flexible part system information is transmitted. The subframe position where the information is transmitted is represented by the number of subframes from the first starting subframe of the frame.

Table 3 below shows scheduling information of fixed part system information acquired by a user terminal according to a third embodiment of the present invention.

Flexible Part System Information Frame position information Sub frame position information # s1 0 15 # s2 One 13 # s3 One 7 # s4 4 2 # s5 2 3 ... ... ... #sN 5 8

Here, each of the different flexible part system information is defined as '#sN', wherein N = 0, 1, 2, 3,. Represents the number of types of total system information. According to the third embodiment, the fixed part system information includes position information of a subframe in which the flexible part system information is transmitted.

That is, # s1 is located in the same frame as the received fixed part system information (hereinafter, referred to as a 'F0 frame'), and is particularly located in the fifteenth subframe of 20 subframes. # s2 is located in the 13th subframe of the F0 frame + 80ms of the F1 frame. # s3 is located in the seventh subframe among the 20 subframes constituting the F1 frame. # s4 is located in the second subframe of the F4 frame of the F0 frame + (80ms * 4). # s5 is located in the third subframe of the F2 frame of the F0 frame + (80ms * 2). #sN is located in the eighth subframe of the F5 frame of the F0 frame + (80ms * 5).

At this time, in order to show the <Table 3>, a scheduling bit corresponding to the same number as in <Equation 1> is required.

Number of bits of scheduling information = {(number of bits for expressing position information of frame * N) + (number of bits for expressing position information of subframe * N)}

Herein, N represents the total number of flexible part system information. In the present invention, the case where N is eight is described as an example. When N is 8, the number of bits required for position information of the frame for representing each flexible part system information is 3 in total. In addition, the position information of the subframe of the flexible part system information is represented by a total of 5 bits as the one frame is composed of 20 subframes. In this case, the size of the scheduling information may be configured to further include the type information of the 3-bit flexible part system information. N may vary as the total number of flexible part system information increases.

In consideration of such a situation, the bits for the scheduling information included in the fixed part system information are represented by a total of {(3 * 8) + (5 * 8)} = 64 bits. In addition, an additional 24 bits may be needed to distinguish the type of the entire flexible part system information.

In operation 705, the user terminal may transmit the flexible part system information transmitted through the DL-SCH based on the information on the type of the flexible part system information acquired in operation 704, the frame information on which the flexible part system information is transmitted, and the subframe information. Receive

As described above, the scheduling information included in the fixed part system information requires a total of 64 bits to represent the frame position information and the sub frame position information of each flexible part system information.

Although it accurately recognizes the corresponding subframe position of each flexible part system information represented by the 64-bit, there is an advantage of maximizing power consumption of acquiring corresponding system information according to the sleep state and wake-up state of the user terminal. . However, there is some signaling overhead for transmitting the 64 bit scheduling information.

<< fourth embodiment >>

In the following fourth embodiment according to the present invention, the flexible part system information is transmitted in the same frame as the frame in which the fixed part system information is transmitted, and the position of the subframe in which the flexible part is transmitted in one frame is defined in advance. Assume that it is not.

The fixed part system information transmitted in the frame is the fixed part system information transmitted in the frame in which the flexible part system information is transmitted. The type of the flexible part system information, the frame position transmitted and the flexible part system information in the same frame It includes location information of the located subframe.

In other words, the remaining flexible part system information includes the type of system information and the frame position to be transmitted, but does not include the position information of the subframe.

8 is a flowchart illustrating an example of receiving system information according to a fourth embodiment of the present invention.

Referring to FIG. 8, in step 801, a user terminal receives fixed part system information transmitted through a BCH channel at a predetermined bandwidth and a predetermined position and performs decoding.

In step 803, the user terminal determines whether a CRC error has occurred in the received information by performing the decoding. At this time, if it is determined that a CRC error occurs, it is determined that the fixed part system information of the corresponding user terminal is not, and decoding is performed at a predetermined bandwidth and a predetermined position.

If the CRC error does not occur in step 804, it is determined that the fixed part system information of the user terminal, and from the received fixed part system information to obtain the frame position information to which each flexible part system information is transmitted.

In this case, the information about the frame position to which the flexible part system information is transmitted is represented by the number of fixed part system information transmitted from the frame from which the flexible part system information is transmitted until the next flexible part system information is transmitted.

Table 4 below shows scheduling information of fixed part system information acquired by a user terminal according to a fourth embodiment of the present invention.

Flexible Part System Information Frame position information Sub frame position information # s1 0 15 # s2 One x # s3 One x # s4 4 x # s5 2 x ... ... ... #sN 5 x

According to the fourth embodiment, the fixed part system information is transmitted including frame position information and subframe position information of the flexible part system information existing within the current 80 ms transmission period. That is, the frame position information and the subframe position information of the entire flexible part system information existing within 80 ms are transmitted.

That is, # s1 is located in the same frame as the received fixed part system information (hereinafter referred to as 'F0 frame'), and is particularly located in the fifteenth subframe of 20 subframes.

On the other hand, # s2 will be transmitted in the F1 frame which is the F0 frame + 80ms. Accordingly, the user terminal checks the fixed part system information transmitted in the F1 frame to obtain subframe position information, and then checks # s2 at the corresponding subframe position. # s3 will be transmitted in the F1 frame, which is the F0 frame + 80ms. Accordingly, the user terminal acquires subframe position information by checking fixed part system information transmitted in the F1 frame and then confirms # s3 at the corresponding subframe position.

And, # s4 will be transmitted in the F4 frame of the F0 frame + (80ms * 4). Accordingly, the user terminal checks the fixed part system information transmitted in the F4 frame to obtain subframe position information, and then checks the # s4 at the corresponding subframe position.

# s5 checks the fixed part system information transmitted in the F2 frame of the F0 frame + (80ms * 2) to obtain subframe position information, and acquires the # s5 at the corresponding subframe position. #sN acquires fixed part system information in the F5 frame of the F0 frame + (80ms * 5) and confirms subframe position information through the obtained fixed part system information. Thereafter, #sN is obtained in the corresponding subframe.

As described above, the frame position information of each of the decoded flexible part system information is represented by a multiple of 80 ms from the current transmission period in which the fixed part system information is obtained.

In other words, in the fourth embodiment, the scheduling information of the fixed part system information includes frame position information and subframe position information of the flexible part system information transmitted in the current transmission period. On the other hand, for each of the flexible part system information transmitted in a different transmission period is transmitted including only the frame position information.

At this time, assuming that there are a maximum of eight types of flexible part system information and a maximum transmission period of 640 ms, the number of fixed part system information transmitted during the 640 ms period is eight. This is because the transmission period of the fixed part system information is 80 ms. In addition, the number of subframes transmitted in one frame is 20. Accordingly, according to the fourth embodiment, the number of bits required for the scheduling information is represented by 3 bits of frame position information and 5 bits of subframe position information, which is expressed as a total ((3 * 8) +5) = 29 bits. . This means that the amount of transmission of scheduling information is reduced compared to the third embodiment.

In operation 805, the user terminal decodes the fixed part system information to obtain frame position information and subframe position information of the flexible part system information transmitted in a current transmission period. In operation 806, the user terminal receives corresponding flexible part system information transmitted through the DL-SCH in the obtained subframe.

In the case of the fourth embodiment, the number of flexible part system system information transmitted in the corresponding frame is variable. Therefore, the size of the fixed part system information system information including the scheduling information for this should also be variable. Assuming that there are a maximum of eight types of flexible part system system information and a maximum transmission period of 640 ms, the number of fixed part system information system information transmitted during the same period is eight, and the number of subframes transmitted in one frame is 20. Therefore, the size of the scheduling information included in the fixed part system information system information with respect to one flexible part system system information can be represented by 3 bits of frame information and 5 bits of subframe information. That is, scheduling information of 8 bits is required for one flexible part system system information, and the scheduling information in the fixed part system information system information is increased by 8 bits according to the number of flexible part system system information transmitted in the corresponding frame. .

For example, when one flexible part system system information is transmitted in a corresponding frame, scheduling information for the flexible part system system information included in the fixed part system information system information requires 8 bits, and two flexible part systems 16 bits are required when system information is transmitted, and 8 x N bits are required when N flexible part system system information is transmitted. Therefore, the UE must perform blind detection for all possible cases.

<< fifth embodiment >>

In the following fifth embodiment of the present invention, it is assumed that the flexible part system information can be transmitted in any frame without the restriction that the fixed part system information is transmitted in the same frame as the transmitted frame. In addition, it is assumed that the position of the subframe in which the flexible part system information is transmitted in one frame is not defined in advance.

The fixed part system information includes a type of flexible part system information, a frame position to be transmitted, and position information of a subframe. That is, according to the fifth embodiment of the present invention, the fixed part system information and the flexible part system information are not present within the 80 ms period.

9 is a flowchart illustrating an example of receiving system information according to a fifth embodiment of the present invention.

Referring to FIG. 9, in step 901, a user terminal receives fixed part system information transmitted through a BCH channel at a predetermined bandwidth and a predetermined position and performs decoding.

In step 903, the user terminal performs the decoding to check whether a CRC error has occurred in the received information. In this case, if it is determined that a CRC error occurs, it is confirmed that the received information is not fixed part system information of the user terminal. The process proceeds to step 901 to continue decoding the received information at a predetermined bandwidth and a predetermined position.

On the other hand, if it is determined in step 904 that the CRC error does not occur, it is determined that the fixed part system information of the user terminal, information of the frame of the flexible part system information transmitted in the same transmission period from the fixed part system information And obtain position information of the sub-frame.

Tables 5 and 6 below show scheduling information of fixed part system information acquired by a user terminal according to a fifth embodiment of the present invention. Here, <Table 5> is scheduling information of fixed part system information transmitted within 80m which is the first transmission period at the start of a frame, and <Table 6> is scheduling information of fixed part system information transmitted within 160m which is the second transmission period. to be.

Flexible Part System Information Frame position information Sub frame position information # s1 0 61 # s2 One x # s3 One x # s4 4 x # s5 2 x ... ... ... #sN 5 x

Flexible Part System Information Frame position information Sub frame position information # s1 0 x # s2 One 102 # s3 One 37 # s4 4 x # s5 2 x ... ... ... #sN 5 x

According to the fifth embodiment, the fixed part system information includes frame position information and subframe position information of the flexible part system information existing within a current 80 ms transmission period, wherein the position information of the subframe is Unlike the above-described embodiments, it has subframe position information in different frames.

In the first to fourth embodiments, the flexible part system information is transmitted in a subframe within one frame in which the fixed part system information is transmitted. In the fifth embodiment, the flexible part system information is transmitted in the fixed part system information. Is transmitted in a frame different from the one being. That is, in the first to fourth embodiments, the fixed part system information transmitted in any 10 ms frame (for example, f1) within 80 ms is received, and from the fixed part system information, 20 of the f1 is received. Receiving flexible part system information transmitted from any subframe sf1 among the subframes will be described as an example.

Meanwhile, in the fifth embodiment, the user terminal receives fixed part system information transmitted in any 10 ms frame within 80 ms, for example, f1, and from the fixed part system information, a 10 ms frame different from f1, that is, f2. The flexible part system information is received in the corresponding subframe of f to f8.

Accordingly, with reference to Table 5, the user terminal receives the fixed part system information in the f1 frame of the F0 frame, and the flexible heart that is # s1 at a position that is 61 subframes away from f1 receiving the fixed part system information. Receive system information.

At this time, the fixed part system information includes frame position information of multiples of 80 ms for receiving fixed part system information for # s2 to #sN.

That is, the user terminal is the case of # s3 of # s2. At f1 frame + 80ms of the F0 frame receiving the fixed part system information, the fixed parsing system information for # s3 of # s2 is checked, and the subframe information is obtained from the obtained fixed part system information of # s3 of # s2. Acquire.

In the case of # s5, the fixed parsing system information for the # s5 is checked at f1 frame + (80ms * 2) of the F0 frame that receives the fixed part system information, and the obtained fixed part system of # s5 is obtained. Obtain subframe information from the information.

In the case of # s4, the fixed parsing system information for the # s4 is checked at f1 frame + (80ms * 4) of the F0 frame that has received the fixed part system information, and the obtained fixed part system of # s4 is obtained. Obtain subframe information from the information.

In the case of #sN, the fixed parsing system information for the #sN is checked at f1 frame + (80ms * 5) of the F0 frame that receives the fixed part system information, and the obtained fixed part system of #sN is obtained. Obtain subframe information from the information.

Accordingly, in the F1 frame (F0 frame + 80ms), which is the second transmission period, the user terminal receives fixed part system information for # s2 and # s3 and receives the fixed part system information with reference to Table 6 above. Receive flexible heart system information of # s2 at position 102 subframes different from f1, and receive flexible heart system information of # s3 at position 37 subframes different from f1. That is, in terms of time, # s3 is first received and 102 is received.

In the fifth embodiment, the fixed part system information and the flexible part system information are not received within the same 10 ms transmission frame, but 10 ms having a time interval greater than the 10 ms transmission frame from the transmission frame that receives the fixed part system information. Receiving the flexible part system information with multiple transmission frames.

Assuming that there are a maximum of eight types of flexible part system information and a maximum transmission period of 640 ms, the number of fixed part system information transmitted during the 640 ms period is eight. This is because the transmission period of the fixed part system information is 80 ms. In addition, the number of subframes transmitted in one frame is 20.

Therefore, according to the fifth embodiment, the number of bits required for the scheduling information is represented by three bits of frame position information and eight bits of subframe position information, and is represented by a total of ((3 * 8) +8) = 32 bits. . This fifth embodiment has the advantage of providing flexibility in the time difference between fixed part system information and flexible part system information.

In step 905, the user terminal acquires the fixed part system information transmitted in the current transmission period.

In operation 906, the user terminal decodes the fixed part system information to obtain position information of a subframe having a relative time distance from the frame position information from which the fixed part system information is transmitted.

In operation 907, the user terminal receives corresponding flexible part system information transmitted through the DL-SCH at the obtained subframe location.

In the fifth embodiment, the number of flexible part system information transmitted in the corresponding frame is variable, and the size of the fixed part system information system information including the scheduling information thereof must also be variable. Therefore, as in the method described in the fourth embodiment, the UE must perform blind detection.

10 is a diagram illustrating a structure of a user terminal to which the present invention is applied.

The BCH receiver 1005 is a part that receives fixed part system information through the BCH.

The CRC checker 1020 performs a CRC check on the channel received from the BCH receiver 1005 and the DL-SCH receiver 1010. That is, the CRC checker 1020 demodulates the added CRC bit to detect whether or not the data error in the MAC layer of the transmitting device detects an error of the system information included in the received channel.

After confirming that there is no abnormality in the CRC inspection result of the fixed part system information received through the BCH receiving unit 1005, the frame position information obtaining unit 1025 is scheduling information of the flexible part system information included in the fixed part system information. Acquire.

Based on the scheduling information, the frame position information obtaining unit 1025 and the sub frame position information obtaining unit 1030 correspond to the corresponding frame position information and the sub frame of each flexible part system information to be received through the DL-SCH receiving unit 1010. This part acquires location information. The receiving apparatus according to the present invention distinguishes and illustrates the surf frame position information acquisition unit 1030 and the frame position information acquisition unit 1025. However, the sub frame position information acquisition unit 1030 may be included in the frame position information acquisition unit 1025 and implemented.

The frame position information and the sub frame position information are obtained through scheduling information set as in the first to fifth embodiments of the present invention. The obtained frame position information is transmitted to the controller 1040 together with the sub frame position information.

The subframe position information acquisition unit 1030 has a different performing function according to the first to fifth embodiments described above.

For example, in the first embodiment, since the subframe location information is transmitted at a predefined location between the transmitting device and the receiving device, there is no subframe information to be obtained from the fixed part system information. Therefore, the receiving device transmits the predefined subframe information, which is hardcoded and stored, to the controller 1040. In the second embodiment, the position information of the subframe is not defined in advance and is not included in the fixed part system information. Therefore, the subframe position information acquisition unit 1030 does not need to be driven. That is, the DL-SCH receiving unit 1010 of the receiving apparatus sequentially decodes subframes within the frame obtained from the frame position information obtaining unit 1025. In the case of the third to fifth embodiments, the subframe information is obtained through the fixed part system information acquired through the frame position information obtaining unit 1025. Defined in Examples 3 to 5. The obtained subframe position information is transmitted to the controller 1040 together with the frame position information.

The controller 1040 performs the DL-SCH receiver 1010 according to the frame position information and the subframe position information of the flexible part system information acquired through the frame position information acquirer 1025 and the subframe position information acquirer 1030. To control.

The DL-SCH receiver 1010 is a part that receives flexible part system information through the DL-SCH.

The HARQ entity 1015 performs a HARQ process on received information through the DL-SCH. If necessary, a request for retransmission of a DL-SCH that transmits flexible part system information having an error is requested.

The system information analysis unit 1035 analyzes the system information received through the flexible part system information. The system information may include cell identifier information of a cell in which a current reception device is located, frequency information, cell list information of neighbor cells, or channel information according to channel setting. Accordingly, the receiving device updates the information in the cell and performs the corresponding operation using the system information. Meanwhile, although the detailed description of the present invention has been described with reference to specific embodiments, various modifications may be made without departing from the scope of the present invention. Of course, variations are possible. 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 above in detail, the effects obtained by the representative of the disclosed invention will be briefly described as follows.

The present invention has the advantage of receiving scheduling information of a plurality of system information blocks through a BCH, and scheduling and receiving a reception time of a DL-SCH transmitting corresponding system information blocks through the received scheduling information of the BCH.

Claims (19)

In the method for receiving system information in a mobile communication system, Receiving scheduling information including position information of a frame of each of the plurality of system information blocks through a broadcast channel; The terminal transitioning from the sleep state to the wake-up state in a subframe determined corresponding to each of the plurality of system information blocks in the same frame as the specific frame receiving the scheduling information or in an integer multiple of the specific frame And receiving the corresponding system information block through the downlink common channel. The method of claim 1, wherein the terminal, Receiving a corresponding system information block through the downlink common channel in a specific subframe determined in the same frame as the specific frame of the 80 ms period receiving the scheduling information or in an integer multiple of the specific frame. System information receiving method comprising the. The method of claim 1, wherein the terminal, Sequentially decoding 20 subframes within a frame equal to a specific frame of the 80 ms period from which the scheduling information is received or within an integer multiple of the specific frame and receiving a corresponding system information block through the downlink common channel System information receiving method comprising a. The method of claim 1, wherein the terminal, Receiving a corresponding system information block through the downlink common channel in a specific subframe determined by a base station in the same frame as the specific frame that has received the scheduling information or in an integer multiple of the specific frame. System information receiving method. The method of claim 4, wherein the terminal, Corresponding system information through the downlink common channel in a specific subframe identified by the number of bits corresponding to the number of system information blocks in the same frame as the specific frame receiving the scheduling information or in an integer multiple of the specific frame. System information receiving method comprising the step of receiving a block. The method of claim 4, wherein the terminal, And receiving a corresponding system information block through the downlink common channel in a specific subframe set in units of subframes from the specific frame in which the scheduling information is received. A terminal device for receiving system information, A first receiver configured to receive scheduling information including transmission location information of each of the plurality of system information blocks through a broadcast channel; And a second receiver configured to receive a corresponding system information block through a downlink common channel at a transmission position determined according to the scheduling information obtained through the first receiver. The method of claim 7, wherein And the first receiver is a broadcast channel receiver configured to receive the scheduling information broadcasted from a cell. The method of claim 7, wherein the terminal device, And a detection unit for detecting a reception error of the broadcast channel received through the first reception unit and detecting whether the scheduling information has been received. The method of claim 7, wherein the terminal device, And a frame position obtaining unit obtaining the position information of each transmitted frame of the plurality of system information blocks from the scheduling information. The method of claim 7, wherein the terminal device, A subframe determined from the scheduling information corresponding to each of the plurality of system information blocks, the position information of each transmitted frame of the plurality of system information blocks and the frame in the same frame or in an integer multiple of the specific frame. And a subframe obtaining unit for obtaining. The method of claim 7, wherein the second receiver, A subframe determined from the scheduling information corresponding to each of the plurality of system information blocks, the position information of each transmitted frame of the plurality of system information blocks and the frame in the same frame or in an integer multiple of the specific frame. And a downlink common channel receiver for receiving the corresponding system information block through the downlink common channel in the obtained subframe. A base station method for transmitting system information blocks, the method comprising: Transmitting a broadcast channel including scheduling information indicating a transmission location of a plurality of system information blocks in a cell to a terminal; And assigning the plurality of system information blocks to a downlink common channel and transmitting the plurality of system information blocks to the terminal according to the scheduling information. The method of claim 13, wherein the base station, Configuring the scheduling information including frame position information for each of the plurality of system information blocks within the same frame or an integer multiple of the specific frame that has received the scheduling information by the terminal. System information block transmission method characterized in that. The method of claim 14, wherein the base station, And configuring the scheduling information further comprising location information of a subframe for each of the plurality of system information blocks. The method of claim 15, wherein the base station, And configuring the scheduling information further comprising location information of the subframe for each of the plurality of system information blocks, which is distinguished by the number of bits corresponding to the number of system information blocks. Information block transmission method. The method of claim 16, wherein the base station, And calculating the location information of each subframe for each of the plurality of system information blocks in units of subframes from the specific frame in which the scheduling information is received by the terminal to configure the scheduling information. System information block transmission method. The method of claim 13, wherein the base station, And transmitting the scheduling information to the terminal through the broadcast channel every 80 ms. The method of claim 13, wherein the base station, And transmitting a specific system information block among the plurality of system information blocks to the terminal through the downlink common channel at least once in a 640 ms period.

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