KR20100069541A - Method for efficiently transmitting information on sync channel - Google Patents

Abstract

PURPOSE: A method for efficiently transmitting information on a sync channel is provided to properly receive system information by generating an index for system information and transmitting the index to a terminal. CONSTITUTION: System information to be transmitted is obtained(S110), and an index for the system information is generated(S120). Through a sync channel, the index and the system information are transmitted to a terminal(S130), and the system information includes at least one of a base station type, sector information and the grouping information of a cell ID. The sync channel corresponds to a P-SCH(Primary-Sync Channel) or a PA(Primary Advance) preamble.

Description

Effective information transmission on synchronous channels {METHOD FOR EFFICIENTLY TRANSMITTING INFORMATION ON SYNC CHANNEL}

The present invention relates to an information transmission method in mobile communication, and more particularly, to an information transmission method effective on a synchronization channel.

Second generation mobile communication refers to digital transmission and reception of voice, such as CDMA and GSM. In addition to the GSM, GPRS has been proposed. The GPRS is a technology for providing a packet switched data service based on the GSM system.

Third generation mobile communication refers to the ability to transmit and receive images and data as well as voice, and the Third Generation Partnership Project (3GPP) developed the mobile communication system (IMT-2000) technology, and radio access technology (Radio Access). Technology, referred to as RAT). In this way, both IMT-2000 technology and radio access technology (RAT), for example, WCDMA, are collectively called UMTS (Universal Mobile Telecommunication System) in Europe. UTRAN stands for UMTS Terrestrial Radio Access Network.

Meanwhile, the third generation mobile communication is evolving to the fourth generation mobile communication.

In the fourth generation mobile communication technology, orthogonal frequency division multiplexing (OFDM) has been introduced.

The 4G mobile communication technology has been proposed as a Long-Term Evolution Network (LTE) technology under standardization in 3GPP and an IEEE 802.16 technology under standardization in IEEE.

The LTE proposes a type 1 radio frame structure applicable to frequency division duplex (FDD) and a type 2 radio frame structure applicable to time division duplex (TDD). have.

The IEEE 802.16 evolved wireless technology, or IEEE 802.11, the radio section is called the Advanced Air Interface. In the Advanced Air Interface (AAIF), both TDD and FDD may be supported.

1 shows the structure of a symbol in the time domain in OFDMA.

As can be seen with reference to FIG. 1, one symbol is maintained for symbol time Ts, which symbol time includes valid symbol times Tb and Tg. The Tg is a copy of the last part of the valid symbol period, called Cyclic Prefix (CP), and is used to collect information about multiple paths while orthogonal tones are maintained.

Meanwhile, the symbols of the OFDMA are described in the frequency domain as follows.

The symbol of the OFDMA is composed of a plurality of subcarriers. In this case, the number of subcarriers determines the FFT size. There are various types of such subcarriers. For example, there are data subcarriers for data transmission, pilot subcarriers for various measurements, and null subcarriers without transmission for guard band and DC subcarriers.

This OFDMA symbol is defined by the following basic parameters.

BW: Channel Bandwidth

N _used : Number of subcarriers (including DC subcarriers).

n: sampling factor, this parameter determines the subcarrier spacing and valid symbol time, together with BW and N _used . This value is set to n = 8/7 for the channel band for 1.75MHz and n = 28/25 for the channel band for 1.25Mhz.

G: This is the ratio of CP time to “useful” time. 1/8 and 1/16 may be supported.

On the other hand, the following parameters are used.

N _FFT : Smallest power out of two greater than N _used

Sampling frequency: F _s = floor (nBW / 8000) x 80000

Subcarrier spacing: Δf = F _s / N _FFT

Valid symbol time: T _b = 1 / Δf

CP time: T _g = G and T _b

OFDMA symbol time: T _s = T _b + T _g

Sampling time: T _b / N _FFT

Table 1 below shows OFDMA parameters.

The nominal channel bandwidth, BW (MHz) 5 7 8.75 10 20 Sampling factor, n 28/25 8/7 8/7 28/25 28/25 Sampling frequency, F _s (MHz) 5.6 8 10 11.2 22.4 FFT size, N _FFT 512 1024 1024 1024 2048 Subcarrier spacing, Δf (kHz) 10.94 7.81 9.77 10.94 10.94 Useful symbol time, T _b (us) 91.4 128 102.4 91.4 91.4 CP ratio, G = 1/8
OFDMA symbol time, T _s (us) 102.8257 144 115.2 102.8257 102.8257 FDD Number of OFDMA symbols
per 5ms frame 48 34 43 48 48 Idle time (us) 62.857 104 46.40 62.857 62.857 TDD Number of OFDMA symbols
per 5ms frame 47 33 42 47 47 TTG + RTG (us) 165.714 248 161.6 165.714 165.714 CP ratio, G = 1/16 OFDMA symbol time, T _s (us) 97.143 136 108.8 97.143 97.143 FDD Number of OFDMA symbols
per 5ms frame 51 36 45 51 51 Idle time (us) 45.71 104 104 45.71 45.71 TDD Number of OFDMA symbols
per 5ms frame 50 35 44 50 50 TTG + RTG (us) 142.853 240 212.8 142.853 142.853 CP ratio, G = 1/4 OFDMA symbol time, T _s (us) 114.286 160 128 114.286 114.286 FDD Number of OFDMA symbols
per 5ms frame 43 31 39 43 43 Idle time (us) 85.694 40 8 85.694 85.694 TDD Number of OFDMA symbols
per 5ms frame 42 30 38 42 42 TTG + RTG (us) 199.98 200 136 199.98 199.98 Number of Guard Sub-Carriers Left 40 80 80 80 160 Right 39 79 79 79 159 Number of Used Sub-Carriers 433 865 865 865 1729 Number of Physical Resource Unit (18x6) in a type-1 subframe 24 48 48 48 96

On the other hand, the following equation 1 represents the voltage of the signal transmitted to the antenna during the OFDMA symbol as a function of time.

Here, t represents the time elapsed since the start of the OFDMA symbol, and 0 <t <T _s .

C _k is a complex number and represents data transmitted on a subcarrier having a frequency offset of k during an OFDMA symbol. This represents a point in the QAM constellation.

는 부반송파 주파수 간격이다. T _g is the Guard Time. T _s is the OFDMA symbol duration.

Is the subcarrier frequency interval.

2 shows a basic frame structure for 5, 10 and 10 MHz channel bands.

As shown, the superframe consists of 20ms in length, and the superframe consists of four radio frames of 5ms in length. The radio frame includes eight subframes. The subframe may be allocated for down and upload transmission. Four types of subframes may be allocated according to the size of CP and bandwidth. First, the type-1 subframe consists of six OFDMA symbols, the type-2 subframe consists of seven OFDMA symbols, the type-3 subframe consists of five OFDMA symbols, and the type-4 subframe. Is composed of 9 OFDMA symbols. In the two subframe types, some of the symbols are idle symbols.

This basic frame structure can be applied to both FDD and TDD and H-FDD. In the TDD system, the number of switching points in each radio frame is 2, and the switching point is defined as a change in directionality, that is, a change from down to upload or upload to download. The number of switching points can be considered up to four.

The superframe includes a superframe header (SFH) as shown. The SFH is located in the first downlink subframe of the superframe and serves as a broadcast channel. SFH occupies the remaining five OFDMA symbol regions except the first OFDMA symbol in the type-1 subframe on the time axis, and occupies a 5 MHz band on the frequency axis. A-Preamble is transmitted in the first OFDMA symbol region that is empty.

Meanwhile, FIG. 3 shows a frame structure having type-1 subframes in FDD duplex mode.

As can be seen with reference to Figure 3, the frame structure is shown when CP = 1/8 T _b .

In each frame shown, subframes can be used for download and upload transmissions, where the download and upload transmissions are distinguished in the frequency domain.

A mobile station supporting FDD can receive a data burst in any download subframe while accessing the upload subframe.

In addition, it is assumed that a base station (BS) supporting the FDD mode can support a mobile station (MS) operating in a half-duplex mode and a full duplex mode on the same RF carrier. In addition, the mobile station supporting the FDD mode uses H-FDD or FDD.

4 shows a frame structure having a type-1 subframe in TDD duplex mode.

In the ratio of download and upload in the TDD frame, the first consecutive subframe is allocated for download and the remaining subframes are allocated for upload. In the 5, 10 and 20 MHz channel bands, the sum of the download and upload subframes is eight. In each frame, TTG and RTG are inserted at the end of each frame and between uploads and downloads.

For example, FIG. 4 shows a TDD frame applicable to 5, 10 and 20 MHz bands having G = 1/8, where a ratio of download and upload is 5: 3.

5 shows a TDD and FDD frame structure with 1/16 T _b .

In the frame structure shown in FIG. 5, the ratio of download and upload is 5: 3.

The frame structure for a CP length of 1/16 T _b configures type-1 and type-2 subframes.

For the 5, 10, and 20 MHz channel bands, an FDD frame may have five type-1 subframes and three type-2 subframes. The TDD frame may have six type-1 subframes and two type-2 subframes.

In a TDD frame, the first and last subframes within each frame may be type-2 subframes. In the Type-2 subframe, the last OFDMA symbol is an idle symbol and is used for the interval required for switching between download and upload.

In the FDD frame, the en-th, fifth and last subframes may be type-2 subframes.

In FIG. 5, if the duration of the OFDMA symbol is 97.143 μs and the CP length is 1/16 T _b , the type-1 and type-2 subframes have a length of 0.583 ms and a length of 0.680 ms, respectively.

Meanwhile, in the fourth generation mobile communication technology, a synchronization channel is called differently for each technology. For example, in LTE technology, it is called a synchronization signal (SS), and in IEEE802.16e, it is called a preamble. In AAIF it is called Advanced-Preamble or A-Preamble.

As described above, in the fourth generation mobile communication technology, a synchronization channel is used as a generic term for all channels / signals, etc. in which a terminal performs time / frequency synchronization with a base station.

6 shows frequency reuse.

When the UE receives the synchronization channel (SCH), the UE may receive interference from an adjacent cell, and due to such interference, performance may be degraded when obtaining a cell ID. In addition, components due to interference may be combined with values to be measured for FFR or PC, such as Received Signal Strength Indication (RSSI), which may reduce the accuracy of the measured values.

Accordingly, as a solution to fundamentally solve this problem, the synchronization channel (SCH) may be transmitted by being given a frequency reuse.

Assume that the reuse factor is F. There are no limitations on how the F cells are arranged using a predetermined portion of the frequency axis so as not to overlap each other.

For example, there may be a localized Allocation method in which frequency resources for a specific cell are stored in a specific portion as shown, and conversely, frequency resources for a specific cell are spread and arranged in a constant frequency band. There may be a distributed allocation scheme.

On the other hand, the structure of the synchronization channel can be classified into two types according to the initial timing / frequency synchronization method.

The first method uses the cross-correlation feature to achieve initial timing / frequency synchronization. In this case, the transmission of the synchronization channel should be carried on all subcarriers on the frequency axis. If the transmission is carried only on an even subcarrier or only on an odd subcarrier, or in general, when a synchronization channel signal is transmitted only on every n (n> = 2) th subcarriers, an ambiguous peak may occur during cross correlation. This can cause problems with initial timing / frequency synchronization.

The second method uses the auto correlation feature to achieve initial timing / frequency synchronization. To use this method, the synchronization channel should be transmitted so that the repetition pattern of the signal appears on the time axis. The simplest way to create a repeating pattern on the time axis is to send the sync channel's signal only to every n (n> = 2) th subcarriers on the frequency axis.

Table 2 below shows advantages and disadvantages of these two types of channel structures. Consequently, auto-correlation-based synchronization channel structures are more preferred because they reduce the computational amount of the UE upon reception and may not be affected by the frequency offset.

Pros Cons Cross correlation algorithm Sharp peaks are obtained when timing is acquired in very small frequency offset environments. The coarse timing process means that it can be skipped in the synchronization procedure.
Complexity increases significantly.
In order to achieve the basic purpose of cell search in a synchronization channel, at least one additional channel is needed in the time / frequency / code / spatial domain for transmitting the cell ID. This is because it is not feasible to accommodate multiple correlators for hundreds of hypothetical tests during timing detection from a practical implementation standpoint.
In a large frequency offset environment, the sharp peak benefit may disappear due to partial correlation. Autocorrelation Based Algorithm -Complexity is small
The synchronization channel may consist of only single OFDM symbols. In other words, no additional resources or channels are needed.
-Can operate regardless of frequency offset -Sophisticated timing required after cell ID detection

On the other hand, the IEEE 802.16e preamble also has a synchronization channel structure for supporting an auto-correlation-based synchronization algorithm. For this reason, every third subcarrier in the frequency axis is represented to represent three repetition patterns in the time axis. It has a structure that carries a transmission signal.

7 shows a relationship between an IEEE 802.16e preamble and an IEEE 802.16m SCH on a superframe.

In the case of the IEEE 802.16m synchronization channel, a time axis repeating pattern should be generated, except that in the legacy-support mode as shown in FIG. 6 (16e and 16m SCHs are mixed with TDM and transmitted), P of AAIF is used. The -SCH transmits 3x repetition and a small repetition factor to each other in order to avoid confusion with the IEEE 802.16e preamble signal.

The illustrated S-SCH (Secondary-Sync Channel) is used for Cell ID transmission. In this way, since the S-SCH is intended to transmit only a Cell ID, the S-SCH may be transmitted without repetition.

Meanwhile, the illustrated primary sync channel (P-SCH) is a channel common to a group of sectors or cells, and used to transmit partial cell ID information (eg, including base station type, sector information, or grouping information of a cell ID). do. The P-SCH supports limited signaling (eg, system bandwidth, carrier information, etc.) and has a fixed bandwidth (eg 5Mhz).

Accordingly, the terminal can obtain information such as sector information, base station type, system bandwidth, and carrier information transmitted on the P-SCH.

As described above, in the prior art, for example, grouping information of a base station type, sector information, or cell ID is transmitted through a P-SCH. However, since the base station does not provide a sequence ID for information such as the base station type, sector information, or grouping information of the cell ID transmitted through the P-SCH, the terminal may select appropriate information from among the information transmitted in the P-SCH. Difficult to extract

In addition, even if a base station provides a sequence ID, the terminal has difficulty in finding desired information at an appropriate location on the P-SCH.

Accordingly, an object of the present invention is to solve the above problems.

In order to achieve the above object, the present invention provides a method for effectively transmitting system information on a synchronization channel in a base station. The method for transmitting system information includes obtaining system information to be transmitted; Creating an index for the system information; And transmitting the index and the system information to the terminal through the synchronization channel.

The system information may include one or more of base station type, sector information, and grouping information of a cell ID. The system information may further include a cell ID.

The sync channel may be a P-SCH or a PA (Primary Advanced-Preamble).

The index is ID_P-SCH = N_0 * a_0 + N_1 * a_1 +. + N_ (K-1) * a_ (K-1). Where N_i = [0, 1, 2,... , (n_i? 1)], and i = 0, 1, 2, 3,... , (K-1), K is a group of information, K is a group of information to be transmitted, n_i represents a kind of information, a_0 = 1, and a_ (i + 1) = a_i * n_i.

The base station may be a base station based on 3GPP Long-Term Evolution (LTE) or a base station based on IEEE 802.16m.

On the other hand, in order to achieve the above object, the present invention provides a method for receiving system information from the base station in the terminal. The receiving method comprises the steps of monitoring a synchronization channel; Receiving an index for system information in the sync channel; Determining a location of each information included in the system information on the synchronization channel using the index; And extracting the system information at the determined location.

According to the present invention, the base station 100 generates an index for system information such as base station type, sector information, or group ID information of a cell ID transmitted on a synchronization channel, and transmits the index to the terminal, whereby the terminal receives the system information. Make sure that you receive correctly.

The present invention applies to fourth generation mobile communications, such as 3GPP LTE or IEEE 802.16m. However, the present invention is not limited thereto and may be applied to all communication systems and methods to which the technical spirit of the present invention may be applied.

It is to be noted that the technical terms used herein are merely used to describe particular embodiments, and are not intended to limit the present invention. It is also to be understood that the technical terms used herein are to be interpreted in a sense generally understood by a person skilled in the art to which the present invention belongs, Should not be construed to mean, or be interpreted in an excessively reduced sense. In addition, when the technical terms used herein are incorrect technical terms that do not accurately express the spirit of the present invention, they should be replaced with technical terms that can be understood correctly by those skilled in the art. In addition, the general terms used in the present invention should be interpreted as defined in the dictionary or according to the context before and after, and should not be interpreted in an excessively reduced sense.

Also, the singular forms "as used herein include plural referents unless the context clearly dictates otherwise. In the present application, terms such as “consisting of” or “comprising” should not be construed as necessarily including all of the various components, or various steps described in the specification, wherein some of the components or some of the steps It should be construed that it may not be included or may further include additional components or steps.

In addition, terms including ordinal numbers, such as first and second, as used herein may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.

When an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, but other elements may be present in between. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, and the same or similar components will be given the same reference numerals regardless of the reference numerals, and redundant description thereof will be omitted. In addition, in describing the present invention, when it is determined that the detailed description of the related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted. In addition, it should be noted that the accompanying drawings are only for easily understanding the spirit of the present invention and should not be construed as limiting the spirit of the present invention by the accompanying drawings. The spirit of the present invention should be construed to extend to all changes, equivalents, and substitutes in addition to the accompanying drawings.

Hereinafter, the term terminal is used, but the terminal may be referred to as a user equipment (UE), a mobile equipment (ME), or a mobile station (MS). In addition, the terminal may be a portable device having a communication function such as a mobile phone, a PDA, a smart phone, a laptop, or the like, or may be a non-portable device such as a PC or a vehicle-mounted device.

8 is an exemplary view showing a terminal and a base station according to the present invention.

As shown in FIG. 8, before the base station 100 transmits, for example, grouping information of a base station type, sector information, or cell ID through a P-SCH or a PA (Primary Advanced-Preamble), an index for the information is provided. Generates and transmits the index to the terminal 200 together with the information.

The terminal 200 monitors the P-SCH or PA preamble and receives information and the index through the P-SCH or PA preamble. The terminal 200 extracts the information at a position according to the index in the P-SCH or PA preamble.

9 shows a flow of operation of the base station shown in FIG.

As can be seen with reference to Figure 9, the base station 100 obtains information to be transmitted (S110). That is, the MAC layer of the base station 100 receives information from an upper layer.

Subsequently, the base station 100 generates an index for the information to be transmitted (S120).

This will be described in detail below.

Assume that an index of information transmitted through the P-SCH or PA preamble is called ID_P-SCH, and there are K groups of transmitted information. Let N_i (i = 0, 1, 2, 3, ..., K-1) be the value of each information group, and let n_i be the kind of information that can be held. Then, the information that the N_i group can have is as follows.

N_i = [0, 1, 2,... , (n_i -1)], where i = 0, 1, 2, 3,... , (K-1)

That is, N_i is the number of information.

Then, the index may be generated by the following equation.

ID_P-SCH = N_0 * a_0 + N_1 * a_1 +... + N_ (K-1) * a_ (K-1)

Here, a_i is a polynomial factor value multiplied by the information of each group to form the index (ID_P-SCH), where a_0 = 1, a_ (i + 1) = a_i * n_i, where i = 0, 1 , 2, … , K-1.

The above equation will be described in detail with reference to the following examples.

The first example includes N_0 including three values composed of sector information, N_1 including five information composed of system bandwidth, and two values consisting of multi-carrier information. Assume that an N_2 value is transmitted through the P-SCH or PA preamble.

Then, Equation 1 may be as follows.

ID_P-SCH = N_0 + 3 * N_1 + 15 * N_2

In this case, even when the order of the types of information mapped to the respective N_0, N_1, N_2 is changed, the above equation may be applied as it is.

For example, N_1 including three values composed of sector information, N_2 including five information composed of system bandwidth, and N_0 including two values composed of multi-carrier information. Assume that this is transmitted through the P-SCH or PA preamble.

Then, Equation 1 may be as follows.

ID_P-SCH = N_0 + 2 * N_1 + 6 * N_2

Third example, N_0 including four values composed of sector information and femto cell information, N_1 including four information composed of system bandwidth, and two values composed of multi-carrier information. Assume that N_2 is transmitted on the P-SCH or PA preamble.

Equation 1 may be as follows.

ID_P-SCH = N_0 + 4 * N_1 + 16 * N_2

For example, N_0 including four values consisting of sector information and filter cell information, N_1 including four pieces of information consisting of system bandwidth, and N_2 values including two values consisting of multi-carrier information. Suppose that N_3 including x bit information in a binary index of a cell ID is transmitted through the P-SCH or PA preamble.

Then, Equation 1 may be as follows.

ID_P-SCH = N_0 + 4 * N_1 + 16 * N_2 + 32 * N_3

However, N_3 has a range of decimal values that can be composed of x bits.

In the fourth example, not only the sector, carrier, and bandwidth information is transmitted through the P-SCH or PA preamble, but also some information of a cell ID transmitted in the S-SCH is also transmitted through the P-SCH or PA preamble. It has been described as being able to be delivered. As described above, when the cell ID is transmitted through the P-SCH or the PA preamble, the complexity of detecting the cell ID from the S-SCH can be reduced.

Meanwhile, Equation 1 may be modified as follows.

If N = 0, then ID_P-SCH = N_0 * a_0 + N_1 * a_1 +. + N_ (K-1) * a_ (K-1)

else if N_K = 1, then ID_P-SCH = predetermined number

Expressions of this form have different information corresponding to N_K, N_0,…. It is not necessary to include all cases that N_ (K-1) may have, and may be used when the information is independent.

As in the above examples, when the index is generated, the base station 100 transmits the index and the information through the P-SCH or PA preamble (S130). In this case, the index may be transmitted through a channel other than the P-SCH or PA preamble.

FIG. 10 illustrates a flow of operations of the terminal illustrated in FIG. 9.

As can be seen with reference to Figure 10, the terminal 200 monitors the synchronization channel, that is, P-SCH or PA preamble (S110).

Subsequently, the terminal 200 receives the index ID_P-SCH through the synchronization channel, that is, the P-SCH or the PA preamble (S220).

The terminal 200 extracts each piece of information located at the position according to the index within the synchronization channel, that is, the P-SCH or the PA preamble (S230).

Specifically, first, the terminal 200 sets the index ID_P-SCH as ID_P-SCH (K-1). Subsequently, the terminal 200 divides the ID_P-SCH (K-1) by a_ (K-1) and divides the floor (ID_P-SCH (K-1) / a_ (K-1)) into N_ (K-1). ), And the remaining (ID_P-SCH (K-1) mod a_ (K-1)) is set as ID_P-SCH (K-2).

Subsequently, the terminal 200 sets K-1 to K-2 and repeats the above process until the ID_P-SCH (0) is set.

The value N_0 is ID_P-SCH (0).

N_i calculated through the above process is represented by Equation 3 below.

N_ (K-1) = floor (ID_P-SCH / a_ (K-1))

N_ (K-2) = floor ((ID_P-SCH mod a_ (K-1)) / a_ (K-2))

= floor ((ID_P-SCH? N (K-1) * a_ (K-1)) / a_ (K-2))

…

N_i = floor ((ID_P-SCH? N_ (K-1) * a_ (K-1)-N_ (K-2) * a_ (K-2)-...-N_ (i + 1) * a_ (i + 1)) / a_i), where i = 0, 1, 2,... , K-1

As described above, the terminal 200 may extract desired information through the index, that is, ID_P-SCH.

The method according to the present invention described above is equally applicable to an S-SCH for transmitting a cell ID or a channel for transmitting a random sequence.

The method according to the invention described thus far can be implemented in software, hardware, or a combination thereof. For example, the method according to the present invention may be stored in a storage medium (eg, mobile terminal internal memory, flash memory, hard disk, etc.) and may be stored in a processor (eg, mobile terminal internal microprocessor). It may be implemented as codes or instructions in a software program that can be executed by.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, May be modified, modified, or improved.

1 shows the structure of a symbol in the time domain in OFDMA.

2 shows a basic frame structure for 5, 10 and 10 MHz channel bands.

3 shows a frame structure with type-1 subframes in FDD duplex mode.

4 shows a frame structure having a type-1 subframe in TDD duplex mode.

5 shows a TDD and FDD frame structure with 1/16 Tb.

6 shows frequency reuse.

7 shows a relationship between an IEEE 802.16e preamble and an IEEE 802.16m SCH on a superframe.

8 is an exemplary view showing a terminal and a base station according to the present invention.

9 shows a flow of operation of the base station shown in FIG.

FIG. 10 illustrates a flow of operations of the terminal illustrated in FIG. 9.

Claims (11)

A method for effectively transmitting system information on a synchronization channel in a base station, Obtaining system information to transmit; Creating an index for the system information; And transmitting the index and the system information to the terminal through the synchronization channel. The method of claim 1, wherein the system information is And at least one of a base station type, sector information, and grouping information of a cell ID. The system of claim 2, wherein the system information is The system information transmission method further comprises a cell ID. The method of claim 1, wherein the sync channel is System information transmission method, characterized in that the P-SCH or PA (Primary Advanced-Preamble). The method of claim 1, wherein the index is ID_P-SCH = N_0 * a_0 + N_1 * a_1 +... + Generated by N_ (K-1) * a_ (K-1), Where N_i = [0, 1, 2,... , (n_i? 1)], and i = 0, 1, 2, 3,... , (K-1), K is a group of information, K is a group of information to be transmitted, n_i represents a kind of information, a_0 = 1, and a_ (i + 1) = a_i * n_i System information transmission method. The method of claim 1, wherein the base station System information transmission method, characterized in that the base station according to 3GPP LTE (Long-Term Evolution) or a base station according to IEEE 802.16. A method for receiving system information from a base station at a terminal, Monitoring a synchronization channel; Receiving an index for system information in the sync channel; Determining a location of each information included in the system information on the synchronization channel using the index; And extracting the system information at the determined position. 8. The system of claim 7, wherein the system information is And at least one of a base station type, sector information, and grouping information of a cell ID. The method of claim 8, wherein the system information is System information receiving method further comprises a cell ID. The method of claim 7, wherein the sync channel is System information receiving method characterized in that the P-SCH or PA Preamble (Primary Advanced-Preamble). The method of claim 7, wherein the base station is System information receiving method, characterized in that the base station according to 3GPP LTE (Long-Term Evolution) or a base station according to IEEE 802.16.

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