KR20020034651A - METHOD TO DISTINGUISH MULTI FRAME STRUCTURE AND INDICATE TRANSMIT DIVERSITY BY PHASE MODULATION OF DwPTS IN NARROW BAND TIME DIVISION DUPLEXING AND APPARATUS - Google Patents

Abstract

PURPOSE: A method and apparatus for confirming a multiple frame structure and indicating a transmission diversity through a phase modulation of a forward pilot time slot in an NB-TDD(Narrow Band-Time Division Duplexing Code Division Multiple Access) CDMA communication system is provided to quickly perform cell search by discriminating a multiple frame using 4 phase modulation angle. CONSTITUTION: A phase control unit(305) receives main information block transmission position information, and determines the certain number of phase modulation angle by main information block transmission position information. I and Q channel phase modulating units(303,304) successively receive the certain number of the determined phase modulation angle from the phase control unit(305), and modulate synchronous codes of transmitting sub-frames and sub-frames which succeed to the transmitting sub-frames by corresponding phase modulation angles among the phase modulation angles.

Description

METHOD TO DISTINGUISH MULTI FRAME STRUCTURE AND INDICATE TRANSMIT DIVERSITY BY PHASE MODULATION OF DwPTS IN NARROW BAND TIME DIVISION DUPLEXING AND APPARATUS}

The present invention relates to a method for identifying a multiple frame structure in a narrowband time division duplexing (NB-TDD) code division multiple access communication system, and more particularly, to a method for identifying a structure of multiple frames to be used in an initial cell search procedure.

Typically, an initial cell search in a narrow band time division duplexing (NB-TDD) code division multiple access communication system may be divided and described in four steps. The first step of the initial cell search step 4 is to receive base station information to which it belongs, and the second step is to identify the scrambling and basic midamble codes that are used. The third step is to synchronize the multiple frames, and the final fourth step is to access the information transmitted through the broadcast channel.

1 is a diagram illustrating a typical initial cell search step in an NB-TDD code division multiple access communication system.

Referring to FIG. 1, in step 101 of FIG. 1, the terminal apparatus includes a sync code included in a downlink pilot time slot (hereinafter referred to as “DwPTS”) in order to acquire forward synchronization with a base station. SYNC code). In step 101, the terminal device uses one or more matched filters. In step 101, the terminal device must identify which of the 32 SYNC codes is its own SYNC code.

In step 102 of FIG. 1, the terminal device identifies a midamble of a primary common control physical channel (hereinafter, referred to as "P-CCPCH"). Typically, in NB-TDD, the total number of midambles is 128, and each SYNC code is associated with four basic midambles. That is, when the terminal device identifies the SYNC code in step 101, it can know four basic midambles, and it can be checked in step 102 which of the basic midambles has been used. In step 102, the terminal device can obtain information on the scrambling code at the same time, considering that each basic midamble has a one-to-one correspondence with the scrambling code.

In step 103 of FIG. 1, the terminal device identifies a start in a multi-frame structure. The beginning of the multi-frame structure can be identified by quadrature phase shift keying (QPSK) phase modulation of DwPTS for P-CCPCH. The structure of the multiple frames in use in the NB-TDD and the QPSK phase modulation method of the DwPTS will be described in detail later.

In step 104 of FIG. 1, the terminal device acquires base station information. In step 103, the terminal device identifying the position of the current frame in the multi-frame structure can know the relative position of a broadcasting channel (hereinafter referred to as "BCH") which is a channel through which base station information is transmitted.

Hereinafter, a method of identifying the multi-frame structure by the terminal device described in step 103 will be described in detail. First, the subframe structure of the conventional NB-TDD shown in FIG. 2 will be described first for convenience of the method of identifying the multi-frame structure.

Typically, in NB-TDD, a subframe consists of seven general time slots, a DwPTS, and an uplink time slot (hereinafter, referred to as "upPTS"), and has a length of 5 msec. On the other hand, the frame used in NB-TDD is a term for two consecutive sub-frames collectively has a length of 10msec. The multi-frame structure refers to a mapping relationship between a specific time slot and a physical channel of several consecutive frames. The relationship is repeated periodically. More specifically, in the multi-frame structure, time slot 0 (corresponding to TS0 of FIG. 2) of each subframe in the multi-frame structure is a BCH, a forward access channel (hereinafter referred to as "FACH"), or a call channel. (paging channel: referred to as " PCH " hereinafter). The mapping relationship between the time slot 0 and the physical channel may be determined in advance, and through step 103 of FIG. 1, the terminal device identifies which point the subframe currently connected to is located in the multi-frame structure. . The conventionally used multi-frame means the repeated structure of all common channels such as BCH, FACH, PCH, PICH, etc. In the present invention, since only BCH is meaningful, only the form in which BCH is repeated is referred to as multi-frame. 3 shows two examples of the multi-frame structure. 3 (a) shows an example of a case where a multi-frame structure is repeated in a cycle of 16 frames, and FIG. 3 (b) shows an example of a case where the multi-frame structure is repeated in a cycle of 32 frames.

Table 1 below shows a phase modulation sequence of the SYNC code received in DwPTS for identification of a multi-frame structure. In Table 1 below, a system frame number (SFN) is a unique number assigned to a frame by a base station.

Phase quadruple (SFN / 2) mod 8 45, 225, 225, 225 0 (frame where BCH exists) 45, 135, 135, 225 One 45, 135, 225, 135 2 45, 315, 225, 315 3 45, 225, 135, 315 4 45, 225, 315, 315 5 45, 225, 225, 135 6 45, 225, 225, 315 7 other Error

As shown in Table 1, the SYNC code received in the DwPTS of an arbitrary subframe has a phase shift of 45 °, 135 °, 225 ° or 315 ° based on the phase of the midamble of the P-CCPCH. To be modulated. That is, in step 103 of FIG. 1, the terminal device can check the phase-modulated form of the SYNC code received in the DwPTS during several consecutive subframes and then know where the subframe is in the multi-frame structure. .

In more detail, the base station transmits a phase-modulated signal by applying the phase modulation pattern shown in Table 1 to the SYNC CODE transmitting the DwPTS of each subframe. Accordingly, the terminal apparatus receiving the phase-modulated SYNC CODE signal learns the pattern of the base station phase-modulated through the phase demodulation of the received SYNC CODE in the DwPTS of each subframe from the received signal. The terminal device compares the found phase demodulation pattern with the phase modulation pattern shown in Table 1 to determine the position of the frame of the signal received by the terminal device. Accordingly, the terminal device determines the start and end of the multiple frames. When the base station transmits the phase modulation by the phase modulation pattern shown in Table 1, the terminal device determines the phase demodulation pattern of the SYNC CODE received in the DwPTS of at least four subframes. Accordingly, it is necessary to compare the phase demodulation pattern as shown in Table 1 to determine which position of the multiple frames the position of the received subframe belongs to. Therefore, in many cases, the terminal apparatus may determine the phase demodulation pattern of the received SYNC CODE in DwPTS of four or five consecutive subframes to synchronize the multiple frames.

According to the above-described initial cell search method, the terminal apparatus needs at least four consecutive four or five consecutive subframe phase modulation forms in order to grasp the multi-frame structure. This is due to the fact that there are cases where three or four phase modulation forms overlap in the phase modulation sequence of DwPTS shown in Table 1.

4 shows an example in which phase modulation forms of four consecutive subframes overlap when the DwPTS phase modulation sequence of Table 1 is applied. In FIG. 4, it can be seen that the phase modulation forms of four consecutive subframes from the subframes connected by the connection line are the same. For example, the phase modulation form of three consecutive subframes including the 14th subframe is 225 °, 315 ° and 45 ° 225 °, and the phase modulation type of four subframes including the subframe connected by the connecting line is also 225 °. , 315 °, 45 ° and 225 °. That is, in FIG. 4, the terminal apparatus which starts checking the multi-frame structure in the subframe connected by the connection line may identify the multi-frame structure only by looking at the phase modulation forms of at least five consecutive subframes. In detail, the base station modulates and transmits the phase of the SYNC code to the DwPTS of each subframe in the pattern of phase modulation angle shown in Table 1 above. Referring to the pattern of the phase modulation angle shown in Table 1, the terminal apparatus compares the phase modulation pattern of the SYNC code received in the DwPTS of at least four consecutive subframes received from the base station to the position of the frame actually received by the terminal device. Can recognize and synchronize multiple frames.

As described above, in the conventional cell search method performed in NB-TDD, four phase modulation types may be generated in succession when viewed from different starting points, so that phase modulation types for many subframes may be identified to identify a multi-frame structure. There was a problem to look at them.

The phase modulation method of the SYNC code included in the subframe may be given a method of carrying other information. First, a master information block (hereinafter referred to as "MIB") is a block having the most main information of a base station with which a terminal communicates, and is included in a BCH with a predetermined period and transmitted.

In general, the system information is transmitted to the terminal through transmission of a system information block (hereinafter, referred to as "SIB"). There are several such SIBs according to the purpose, and each SIB may be characterized according to a repetition period and a period that the UE needs to update. It is the MIB described above that includes information on the distribution or scheduling of these SIBs. Xx is a figure which describes the relationship between MIB and SIB. That is, the system information is in the form of a pyramid of MIB and SIB as shown in FIG. Among them, the MIB is at the top of the pyramid structure and contains information about how many SIBs exist in the current cell and how to schedule the SIBs. On the other hand, the SIB includes actual system information, that is, information obtained from the core network, or information on characteristics of the current cell, and also includes reference information of other SIBs. Therefore, the most important and priority process in the cell search process may be referred to as a process of reading the MIB. See 3GPP TS 25.331 for details. In the present invention, information to be informed through phase modulation of the DwPTS is the position of the MIB described above.

The transmission period of the MIB is available in 8 frames, 16 frames, and 32 frames, and is included in the BCH where the frames of SFN mod 8, SFN mod 16, and SFN mod 32 are located for each period. First, a master information block (hereinafter referred to as "MIB") is a block having the most main information of a base station with which a terminal communicates, and is included in a BCH with a predetermined period and transmitted. The period can be 8 frames, 16 frames, 32 frames, and each period is included in the BCH where the frames of SFN mod 8, SFN mod 16, and SFN mod 32 are transmitted. If the location of the BCH including the MIB described above is known in advance, many performances can be improved in cell searching by reading only the BCH located at the location instead of reading all the BCHs. That is, since the position of the MIB can be determined according to the phase modulation value according to the phase demodulation, the MIB information can be read without reading all the frames. Therefore, at the cell search time, that is, if the MIB position is known only by receiving the physical channel, information of the base station can be read more quickly and simply. If the above-described phase modulation can be modified to give the location information of the MIB, it can exhibit faster and better performance in time in cell searching. When determining the location of the MIB, it is possible to provide information to the decoder to decode from the start position of the MIB.

Referring to the example of the multi-frame structure of FIG. 3 described above, in the case of (a) of FIG. 3, since the period of the multi-frame is 16 frames, the MIB is transmitted with a period of 16 frames or 32 sub-frames. In the case of (b) of FIG. 3, since the period of the multiple frames is 32 frames, the MIB is transmitted with the period of 32 frames or 64 subframes.

If the MIB has a period of 16 frames, the MIB is transmitted to the BCH of SFNs 0, 16, 32, ... frames in FIG. In the case of (b) of FIG. 3, since the period of the multiple frames is 32 frames, the MIB has a period of 32 frames, and the MIB is transmitted to the BCH of SFNs of 0, 32, 64, ... frames.

If the transmission diversity method of the P-CCPCH is used in a narrowband code division multiple access system, a method for notifying the UE whether the P-CCPCH should use the transmission diversity method without any information should be presented. . That is, if it is possible to indicate whether P-CCPCH transmit diversity is performed through the phase modulation of the above-described SYNC code, improved performance can be obtained in P-CCPCH reception.

Using the current SYNC code phase modulation method described above, a method of notifying the terminal of the position information of the above-described MIB and whether transmission diversity of the P-CCPCH is used is not presented.

Accordingly, an object of the present invention for solving the above problems is to provide a method for identifying a multi-frame structure faster.

Another object of the present invention is to provide a method of generating a phase modulation sequence that enables a faster identification of a multi-frame structure.

It is still another object of the present invention to provide a method for identifying a multi-frame structure regardless of a point in time at which the multi-frame structure is started.

Another object of the present invention is to provide a method for finding the starting point of a multi-frame regardless of the size and shape of the multi-frame structure.

It is still another object of the present invention to provide a method of generating a phase modulation sequence that enables a multi-frame structure to be identified regardless of a starting point of the multi-frame structure.

It is still another object of the present invention to provide a method for identifying a multi-frame structure by checking only phase modulation forms of four consecutive subframes.

Another object of the present invention is to provide a method of generating a phase modulation sequence of DwPTS that can be applied to a multi-frame structure of an existing NB-TDD code division multiple access communication system.

It is still another object of the present invention to provide a method of generating a phase modulation sequence that satisfies a particular regularity as a modified example of the method of generating a phase modulation sequence.

It is still another object of the present invention to provide a transmitter for transmitting a signal modulated with a phase modulated pattern.

It is still another object of the present invention to provide a receiver capable of synchronizing multiple frame synchronization of a received signal by determining only a phase modulation pattern of four consecutive subframes.

It is still another object of the present invention to provide a method for determining the location of a frame including a MIB by using a received signal.

It is still another object of the present invention to provide a method for determining whether P-CCPCH uses transmit diversity using a received signal.

1 shows a typical initial cell search step in a narrowband time division duplexing (NB-TDD) code division multiple access communication system.

2 shows a typical subframe structure of a narrowband time division duplexing (NB-TDD) code division multiple access communication system.

3 illustrates an example of a typical multi-frame structure of a narrowband time division duplexing (NB-TDD) code division multiple access communication system.

4 is a sequence in a phase modulation sequence of a downlink pilot time slot (hereinafter referred to as "DwPTS") for identifying a multiple frame structure of a narrowband time division duplexing (NB-TDD) code division multiple access communication system. A diagram showing an example of overlapping four subframes.

5 is a diagram illustrating a configuration of an apparatus for performing phase modulation of a DwPTS by a base station according to an exemplary embodiment of the present invention.

6 is a diagram illustrating a configuration of a base station transmitter for transmitting a first common control physical channel signal according to an embodiment of the present invention.

7 is a diagram illustrating a configuration of a terminal receiver for receiving a phase-modulated DwPTS and identifying multiple frames according to an embodiment of the present invention.

FIG. 8 is a diagram illustrating a method of generating a DwPTS phase modulation sequence proposed by the present invention, and illustrates a process of synthesizing a 32-bit DwPTS phase modulation sequence into 29 four-bit quaternary sequences. FIG.

FIG. 9 is a diagram illustrating a characteristic that a 4-bit quadruple sequence selected last (that is, 29th) must be satisfied when using the method of generating a DwPTS phase modulation sequence proposed in the present invention.

10 is an example of a 32-bit quaternary sequence generated using the DwPTS phase modulation sequence generation method proposed in the present invention.

FIG. 11 is a diagram illustrating a method for informing the structure of multiple frames and whether transmit diversity is used using a DwPTS phase modulation sequence proposed in the present invention. FIG.

12 is a diagram showing structured features of MIB and SIB, which are system information blocks;

FIG. 13 is a flowchart showing what sequence can be found to obtain position information when the modulated phases of four consecutive DwPTSs are found; FIG.

Hereinafter, with reference to the accompanying drawings according to an embodiment of the present invention will be described an embodiment of the present invention.

In the present invention, first, a phase modulation / demodulation pattern capable of synchronizing multiple frames through phase demodulation of a received SYNC code in DwPTS of four consecutive subframes in a narrowband time division duplexing code division multiple access communication system To present. Second, phase modulation / demodulation that can indicate whether to use transmit diversity of P-CCPCH through phase demodulation of SYNC CODE received in DwPTS of 4 consecutive subframes in narrowband time division duplexing code division multiple access communication system. Present the pattern. Third, in a narrowband time division duplexing code division multiple access communication system, a transmitter capable of phase modulating and transmitting a SYNC code of a subframe according to the phase modulation pattern presented above is provided. Fourth, in a narrowband time division duplexing code division multiple access communication system, a receiver capable of synchronizing multiple frames by phase demodulating a SYNC code of a subframe of a signal transmitted by the transmitter at most four times is provided. Fifth, in the narrowband time division duplexing code division multiple access communication system, in the proposed narrow band time division duplexing code division multiple access communication system, P-CCPCH transmission is performed by phase-modulating the SYNC code of a subframe of a signal transmitted by the transmitter. Provides a receiver for finding diversity. Sixth, the present invention provides a method and apparatus for determining the position of a frame including a MIB by transmitting a phase-modulated SYNC code of a subframe according to the above-described phase modulation pattern in a narrowband time division duplexing code division multiple access communication system.

5 is a diagram illustrating a configuration for phase modulating a DwPTS according to an embodiment of the present invention.

Referring to FIG. 5, 301 is an input SYNC code, and the SYNC code 301 is composed of 64 chips and is divided into an I channel and a Q channel. Each of the two channels is multiplied by the values g1 and g2 corresponding to the phase modulation angles determined by a predetermined method. The predetermined method of determining the phase modulation angle will be described later as a method proposed by the present invention. The I-channel is multiplied by g1 in the I-channel phase modulator 303, and the Q-channel is multiplied by g2 in the Q-channel phase modulator 304. Examples of g1 and g2 values used in the apparatus are defined in Table 2 below.

Phase modulation angle g ₁ g ₂ 45 One One 135 -One One 225 -One -One 315 One -One

The phase controller 305 controls the g1 and g2 values according to the values defined in Table 2. The phase controller 305 should store the phase modulation pattern of the SYNC code transmitted to the DwPTS of the subframe, that is, the phase modulation pattern as shown in Table 2 in the internal memory. That is, the phase controller 305 refers to the phase modulation angle stored in the internal memory by referring to the phase of the midamble of the transmission signal of the P-CCPCH, and the phase modulation value to the I channel phase modulator 303 and the Q channel phase modulator 304. Phase modulation is performed for each subframe. The controller 305 also controls whether to use transmit diversity of 401 of FIG. 6. The method will be described later as a method to be proposed in the present invention. On the other hand, the phase modulation pattern is used as information to define whether to use the transmission diversity and to determine the MIB position.

The Q channel signal output from the Q channel phase modulator 304 is multiplied by j and added to the I channel signal output from the I channel phase modulator 303. The added signal I + jQ is time-multiplexed by the 32-chip GP signal and the multiplexer 306 to form a signal transmitted through DwPTS. The signal from the multiplexer 306 is provided to the input of the time multiplexer 406 of FIG. That is, the information of the MIB may have 8, 16, or 32 frame periods. Accordingly, the phase controller 305 should store different phase modulation tables according to the period of the MIB.

6 is a diagram illustrating a configuration for transmitting multiple frames in an NB-TDD system according to an embodiment of the present invention.

Referring to FIG. 6, a space time transmit diversity (STSTD) encoder 401 receives a P-CCPCH 400 and multiplies the P-CCPCH 400 under the control of the phase controller 305. Or outputs to multiplier 421 and multiplier 422. The P-CCPCH signal is transmitted with BCH information included. The BCH includes information of MIB and SIB and is transmitted. The transmission period of the MIB may have a period of 8, 16 or 32 frames. The location where the MIB is transmitted is determined according to the MIB transmission period. The position at which the MIB is transmitted is related to the phase modulation of the SYNC code of the DwPCH. That is, the phase modulation pattern of the SYNC code may be changed according to the position where the MIB is transmitted and whether transmission diversity is used. P-CCPCH signal control information is provided to the phase controller 305 to modulate the phase of the SYNC code signal of FIG. 5 with reference to a phase modulation table stored in the phase controller 305 according to the signal control information of the P-CCPCH. . In more detail, the signal control information of the P-CCPCH may be referred to as the number of subframes from the MIB information. The phase controller 305 controls phase modulation according to information on the transmit diversity of the P-CCPCH 400 and the information on the number of subframes from the MIB information. If there is no use of the transmit diversity, only the multiplier 421 is inputted to the P-CCPCH. The signal 400 is spread with an OVSF code and output. The spread P-CCPCH signal is scrambled with a scrambling code in a multiplier 423. The output signal of the multiplier 423 is multiplexed with the midamble 1 402 at the multiplexer 404. The signal multiplexed at the multiplexer 404 is multiplexed with signals of other channels at the time multiplexer 406. A second common control physical channel (hereinafter referred to as "S-CCPCH") 411 including a signal transmitted through the DwPTS output of the multiplexer 306 of FIG. 5 and a DPCH 413 The signal transmitted through is time multiplexed at the time multiplexer 406. The multiplexed signals are signals that have been encoded, channelized, and scrambled. The output of the time multiplexer 406 is transmitted via an antenna 408.

When the phase controller 305 instructs the use of transmit diversity of the P-CCPCH, the P-CCPCH signal 400 is separated into two orthogonalized signals through the STTD encoder 401 and output. In the above case, that is, when the P-CCPCH uses transmit diversity, the second common control physical channel (hereinafter referred to as "S-CCPCH") also uses block STTD transmit diversity and DPCH also has transmit diversity. Will be used. The first signal of the output signal of the STTD encoder 401 is spread by the multiplier 421 to the OVSF code, and the spread P-CCPCH signal is scrambled by the scrambling code by the multiplier 423. The output signal of the multiplier 423 is multiplexed with the midamble 1 402 at the multiplexer 404. The signal multiplexed at the multiplexer 404 is multiplexed with signals of other channels at the time multiplexer 406. The signal 411 to be transmitted through the first antenna 408 of the S-CCPCH using transmit diversity, including the signal transmitted through the DwPTS output of the multiplexer 306 of FIG. 5, and also the first antenna The signal transmitted via DPCH 413 or the like, which should be transmitted via 408, is time multiplexed in the time multiplexer 406. The multiplexed signals are signals that have been encoded, channelized, and scrambled. The output of the time multiplexer 406 is transmitted via an antenna 408.

The second output signal of the STTD encoder 401 is spread out as an OVSF code at the multiplier 422, and the spread P-CCPCH signal is scrambled with a scrambling code at the multiplier 424. The output signal of the multiplier 424 is multiplexed with the midamble 2 403 at the multiplexer 405. The signal multiplexed at the multiplexer 405 is multiplexed with signals of other channels at the time multiplexer 407. The S-CCPCH 412 signal to be transmitted through the second antenna 409 and the transmission diversity are also used, and the signal transmitted through the DPCH 414 or the like to be transmitted through the second antenna 409 and the like. Time multiplexed at multiplexer 407. The multiplexed signals are signals that have been encoded, channelized, and scrambled. The output of the time multiplexer 407 is transmitted via antenna 409.

The UE can find the phase angle modulated by the base station through QPSK demodulation of the signal received through DwPTS in the multi-frame synchronization process, which is the third step of the cell search process described with reference to FIG. The combination of phase modulation angles found above makes it possible to identify multiple frame structures.

7 is a diagram illustrating a process of processing a signal received from a base station by a terminal receiver according to an exemplary embodiment of the present invention.

Referring to FIG. 7, the signal received by the antenna 501 is received by the DwPTS 503 at the demultiplexer 502, a signal received through the P-CCPCH 504, a signal received through the S-DDPCH 505, and a DPCH 506. Divided by the signal. The signal received by the DwPTS 503 is further divided into a GP signal 508 and a SYNC code 509 by the demultiplexer 507. Since the SYNC code 509 is QPSK phase modulated, the phase demodulator 520 finds the phase of the SYNC code. The phase value found by the phase demodulator 520 finds the phase modulation angles used in the multi-frame synchronization and the multi-frame currently being transmitted by the transmit diversity detector 521. One of the outputs of the demultiplexer 502, P-CCPCH 504 is despread with the channelization code in the multiplier 510, descrambled with the scrambling code in the multiplier 511, and input to the demultiplexer 522. If no use of diversity is indicated at 521, the output signal of the demultiplexer 522 is 523, and the same signal as that of the input signal of the demultiplexer 522 is output. Since the signals from are mixed, the STTD decoder 525 decodes and outputs the two signals 531 and 532 using the prediction value 526 of each channel.

The phase value found by the phase demodulator 520 locates the subframe currently received by the multi-frame synchronization and transmit diversity detector 521. That is, 521, like the phase controller 305 of FIG. 5, must store a table of a pattern modulated by the base station and a table as shown in Table 2 in a memory. That is, the multi-frame synchronization and transmit diversity detector 521 searches a table for a phase demodulation pattern which stores the demodulated phase demodulation value from the phase demodulator 520 in its memory. The retrieval process in the multi-frame synchronization and transmit diversity detector 521 is described below using the flowchart shown in FIG. The search result at 521 may include a current location or a location of the MIB. If the MIB location is known and the BCH does not need to be read before the MIB, time information up to the location of the next MIB is stored in the memory so that the BCH including the MIB does not need to receive the P-CCPCH, which is a physical channel including the BCH. . When the BCH corresponding to the time information to the MIB stored in the memory arrives, the PCH receives the P-CCPCH and reads the BCH. In the case of using the method described above, the terminal receives the signal more efficiently. Performance such as extending the life can be obtained. Alternatively, when the location of the MIB is determined, the decoder may provide the location information of the MIB so that the decoder can decode the starting location of the MIB. As described above, by providing the position information to the spreader according to the determination of the position of the MIB, power consumption may be reduced by not despreading the frame until the MIB is issued. Alternatively, the MIB position determination by phase modulation may be performed one or more times to increase reliability. The searching process has conventionally searched up to five times the phase demodulation of the SYNC code of the DwPTS of the received subframe. However, if the proposed phase demodulation pattern is used, four of the SYNC codes received through the DwPTS in the maximum received subframe are received. By comparing and searching the phase demodulated pattern, it is possible to synchronize multiple frames, and together with the positioning of the MIB, it is possible to determine whether or not transmit diversity is used when P-CCPCH transmit diversity is used. Will be. The search makes comparison with the phase demodulation value of the received SYNC code signal to determine whether the received frame is a frame of multiple frames. Therefore, the receiver can achieve much faster multi-frame synchronization in comparison with the DwPTS SYNC coded phase demodulation pattern comparison process in four or more subframes in succession. The present invention provides a method and apparatus for determining whether to use transmit diversity.

FIG. 13 is a flowchart illustrating a process of the multi-frame synchronization and transmit diversity detector of 521 described above. FIG. 13 will be described under the assumption that four 32-bit quaternary sequences (named sequences a, b, c, and d) shown in FIG. 8 generated through the sequence generation process are used. A sequence of four demodulated phases demodulated at 520 is received at 601 and sent to a phase comparator of 602. The phase comparator of 602 indicates that the current sequence is sequence a when two consecutive sequences of four consecutive phase sequences have a value of 11, that is, 45 ° and 45 °. The location finder 609 may sequence find the current location, or the location of the MIB. The four phase sequences that did not pass in the phase comparator at 602 go back to the phase comparator at 604 and find that if two consecutive sequences have a value of 12, i.e. 45 °, 135 °, it is one of the sequence b. We can search sequence b at and come to 609 to find the current and MIB locations. The four phase sequences that did not pass 604 go back to the phase comparator of 606 and if two consecutive sequences have a value of 13, i.e. 45 °, 225 °, the value contained in sequence c is the sequence c in 607. If not, the result is the value contained in the sequence d. Therefore, the sequence d is searched at 608 so that they can search the current position or the location of the MIB at 609. When searching by characterizing each sequence as described above, only a corresponding sequence can be found without having to find all of the sequences, thereby reducing the time or complexity of the location search process.

Hereinafter, embodiments of generating phase modulation angles in the phase controller 305 of the above-described transmission apparatus will be described in detail with reference to the accompanying drawings. That is, a method of generating a phase modulation sequence of DwPTS proposed by the present invention and a specific example to which the proposed method is applied are presented. In the meantime, for convenience of description according to an embodiment of the present invention, four angles used for phase modulation of QPSK are denoted as 1, 2, 3, and 4, respectively. The mapping relationship between the four angles used for the actual QPSK modulation and 1, 2, 3, and 4 used for convenience of explanation can be arbitrarily determined to avoid duplication (as long as the one-to-one mapping relationship is maintained). That is, the mapping relationship between the phase shift demodulation values 45 degrees, 135 degrees, 225 degrees, 315 degrees, and 1,2,3, and 4 defined for convenience of description can be arbitrarily determined to avoid duplication.

Since the multi-frame structure of the NB-TDD code division multiple access communication system is typically composed of 32 subframes, 32 DwPTS phase modulation sequences are required for the configuration of the multi-frame structure as shown in Table 1 above. Of course, the length of the multi-frame structure can be changed by satisfying the square frame length of two. In this case, the number of DwPTS phase modulation sequences required for each multiple frame structure length is required. In addition, considering that each bit of the DwPTS phase modulation sequence has a value of 1, 2, 3, or 4, it can be seen that such a phase modulation sequence becomes a quaternary sequence. A method of generating a DwPTS phase modulation sequence proposed in the present invention is to list 30 4-bit quaternary sequences by a specific rule. Herein, the 4-bit quadruple sequence means a sequence consisting of four bits, each bit having a value of 1, 2, 3, or 4, and there are 256 types of 4-bit quadruple sequences.

FIG. 8 illustrates a method of generating a 32-bit DwPTS phase modulation sequence using 29 4-bit 4-element sequences according to an embodiment of the present invention.

First, one of 64 four-bit quaternary sequences is arbitrarily selected and determined as the upper four-bit value of the 32-bit DwPTS phase modulation sequence. Subsequently, one 4-bit quaternary sequence is selected and placed after the previously determined 4-bit quaternary sequence. In this case, two four-bit four-way sequences, that is, eight-bit four-way sequences, are created, and three four-bit four-way sequences exist in the overlapped portion. In other words, a total of five 4-bit sequences are used. Therefore, the middle three 4-bit quaternary sequences are no longer available, and in consideration of this, the unused 4-bit quaternary sequences are found and placed in the following positions. The method described above is repeated until a 32-bit sequence is determined. Note that the last three bits (s30, s31, s32 of FIG. 9) of the last determined (i.e. 29th selected) four-bit ternary sequence and the upper three bits of the predetermined DwPTS (s1 of FIG. 9, Another three 4-bit quaternary sequence (s30, s31.s32.s1 or s31.s32.s1, s2, or s32.s1.s2, s3 in Figure 9) generated from s2, s3 as shown in Figure 9 is It should not be included in the 29 4-bit quaternary sequences used to generate the DwPTS phase modulation sequence. If the 29-bit selected 4-bit quaternary sequence does not satisfy the condition of FIG. 10, another sequence is used to check whether the condition of FIG. 9 is satisfied. If all 29th sequences are examined but the conditions of FIG. 9 are not satisfied, the same process is repeated after changing the 28th selected 4-bit ternary sequence (ie, s28, s29, s30, s31).

The 32-bit quaternary sequence that can be generated above does not overlap any 4-bit quaternary sequence at the same time so that a total of eight sequences can be generated.

10 corresponds to a specific embodiment to which the above-described method of generating a DwPTS phase modulation sequence is applied. The above example is a sequence generated while giving characteristics to make it easy to distinguish each sequence. That is, in FIG. 10A, a two-bit quaternary sequence 1,1 is included in a 4-bit period. 10 (b) shows a two-bit four-way sequence 1,2 at four-bit periods, FIG. 10 (c) shows a two-bit four-way sequence 1,3 at four-bit periods, and FIG. It has a structure in which a 2-bit quaternary sequence 1,4 is included in a 4-bit period. All four 32-bit four-way sequences do not contain the four-bit bit 1 except the periodic two-bit four-way sequence described above. Thus, when four consecutive phases are found, only one of the two bit quadruple sequences 11, 12, 13, or 14 is included. In this case, it is possible to know where the current sequence belongs to among the four 32-bit quaternary sequences. Therefore, the comparison range is greatly reduced in finding a position, so that the computation time is reduced, and the complexity is greatly reduced when implemented in hardware.

The following describes a method of finding the structure of multiple frames and the location of the MIB using the sequences obtained in the generation method. The structure of multiple frames used in a narrowband code division multiple access communication system has a format as shown in FIG. The present invention proposes a method that can inform the start position of multiple frames and the position of the next MIB within four subframe times using the DwPTS phase modulation sequence. The mapping of the QPSK phase modulation angle in a sequence is QPSK with each element of a four-way sequence such as "1-> 45 °", "2-> 225 °", "3-> 135 °", "4-> 315 °". Apply the mapping between phases used for phase modulation.

The sequence used for phase modulation is allowed to repeat according to the period of the MIB. For example, if the period of the MIB is 16 frames, phase modulation of 32 DwPTSs should be performed during the MIB period. Therefore, the DwPTS of each subframe can be QPSK phase modulated using a 32-bit quaternary sequence as shown in FIG. As described above, when the phase modulation angles of four consecutive DwPTSs are found as described above, their positions are uniquely determined, so the current position can be known and the position of the MIB can be known. If a contiguous 4-bit quaternary sequence is determined uniquely, it does not matter in which case the sequence is mapped to multiple frames in any way to find the current location or the location of the MIB. In the following embodiments, some examples of the phase modulation sequence of the DwPTS and the method of finding the position of the MIB or the position of the MIB according to the length of the multiple frames and the period of the MIB are described.

The first embodiment describes the case where the period of the MIB is eight frames. Since the MIB should always be included in the first BCH in the multi-frame structure and transmitted, when the MIB period is 8 frames, the period of the multi-frame should be 8 frames or less. As shown in Table 3 below, when phase modulation is used according to the period of the MIB, the current position, the position of the MIB, and the starting position of the multiple frames can be known through the demodulation of four subframes. do. Table 3 below maps only 16 bits after the 32-bit quadruple sequence shown in FIG. 10A to QPSK phase modulation.

Phase quadruple (SFN / 2) mod 4 Remarks 45 °, 45 °, 225 °, 225 ° 0 Current MIB present, next MIB present after 16-13 subframes 45 °, 45 °, 225 °, 315 ° One Next MIB present after 12-9 subframes 45 °, 45 °, 315 °, 135 ° 2 Next MIB present after 8-5 subframes 45 °, 45 °, 315 °, 315 ° 3 Next MIB present after 4-1 subframe

FIG. 11 illustrates a process of informing the current position, the position of the MIB, and the start position of the multi-frame in multiple frames through phase demodulation of DwPTS in four consecutive subframes when the MIB is repeated in a period of 8 frames. In the following description, reference is made to the phase corresponding to Phase # 1 in FIG. 11. In the case of phase demodulation of DwPTS through cell searching, if the first demodulated phase is located in the second subframe as shown in 1101, four consecutive phases are 45 °, 225 through demodulation of four consecutive subframes. We can see that it is °, 225 °, 45 ° (mapping 4-bit quaternary sequence 1,3,3,1 to QPSK phase). Since the position having the four consecutive phase values is only the fifth subframe in the second subframe, the current position can be known, and the information that the MIB comes after 12 subframes is also known. In the above case, assuming that the size of the multi-frame is determined to be 8 frames, the starting position of the multi-frame is also 12 subframes. If the size of the multi-frame is 4 frames, the starting position of the multi-frame is 4 sub-frames. Can be.

As another example, if the phase demodulation of four consecutive DwPTSs is confirmed with 45 °, 45 °, 315 °, 315 ° (mapping 4-bit quaternary sequences 1,1,4,4 to QPSK phase) Only 1106 and 16th subframes of FIG. 11 are unique in the 13th subframe of FIG. Therefore, it can be seen that after demodulation of four phases, the MIB is the 13th subframe at the current position and the MIB is after 4 subframes.

The second embodiment describes the case where the period of the MIB is 16 frames. Since the MIB should always be included in the first BCH in the multi-frame structure and transmitted, when the MIB period is 16 frames, the period of the multi-frame should be 16 frames or less. As shown in Table 3 below, when phase modulation is used according to the period of the MIB, the current position, the position of the MIB, and the starting position of the multiple frames can be known through the demodulation of four subframes. do. Table 3 below maps the 32-bit quaternary sequence shown in FIG. 10A to QPSK phase modulation.

Phase quadruple (SFN / 2) mod 8 Remarks 45 °, 45 °, 135 °, 135 ° 0 MIB present, next MIB present after 32-29 subframes 45 °, 45 °, 135 °, 225 ° One Next MIB exists after 28-25 subframes 45 °, 45 °, 135 °, 315 ° 2 Next MIB present after 24 to 21 subframes 45 °, 45 °, 225 °, 135 ° 3 Next MIB present after 20-17 subframes 45 °, 45 °, 225 °, 225 ° 4 Next MIB present after 16-13 subframes 45 °, 45 °, 225 °, 315 ° 5 Next MIB present after 12-9 subframes 45 °, 45 °, 315 °, 135 ° 6 Next MIB present after 8-5 subframes 45 °, 45 °, 315 °, 315 ° 7 Next MIB present after 4-1 subframe

Phase demodulation of DwPTS through the cell search process When the first demodulated phase is located in the second subframe, four consecutive phases are demodulated by four consecutive subframes 45 °, 135 °, 135 ° The position of the subframe at 45 ° (which maps the 4-bit quaternary sequence 1,2,2,1 to QPSK phase) is only possible because the 29th subframe is possible from the 26th subframe. The information that the MIB comes after 4 subframes is also known. In the above case, assuming that the size of the multiframe is set to 16 frames, the starting position of the multiframe is also 4 subframes later. Even if the size of the multiframe is 8 or 4 frames, the starting position of the multiframe is 4 subframes later. It can be seen that.

As another example, if the phase demodulation of four consecutive DwPTSs is confirmed to be 135 °, 45 °, 45 °, 135 ° (mapping 4-bit quaternary sequence 2,1,1,2 to QPSK phase) Only the seventh subframe in the fourth subframe is unique in position with the 4-bit quadrature sequence. Thus, it can be seen that after demodulation of four phases, the MIB is the seventh subframe at the current position and the MIB is 26 subframes later.

The third embodiment describes the case where the period of the MIB is 32 frames. If the period of the MIB is 32 frames, the period of the multiple frames should be 32 frames or less. As shown in Table 5, when phase modulation is used according to the period of the MIB, the current position, the position of the MIB, and the starting position of the multiple frames can be known through the demodulation of four subframes. do. Table 5 shows a 64-bit quadrature sequence by using the 32-bit quadrature sequence shown in FIG. 10 (b) and the 32-bit quadrature sequence shown in FIG. .

Phase quadruple (SFN / 2) mod 16 Remarks 45 °, 135 °, 135 °, 135 ° 0 MIB present, next MIB present after 64 to 61 subframe 45 °, 135 °, 135 °, 225 ° One Next MIB present after 60-57 subframes 45 °, 135 °, 135 °, 315 ° 2 Next MIB present after 56-53 subframes 45 °, 135 °, 225 °, 135 ° 3 Next MIB present after 52-49 subframes 45 °, 135 °, 315 °, 135 ° 4 Next MIB present after 48-45 subframes 45 °, 135 °, 225 °, 225 ° 5 Next MIB present after 44-41 subframes 45 °, 135 °, 225 °, 315 ° 6 Next MIB present after 40-37 subframes 45 °, 135 °, 315 °, 315 ° 7 Next MIB present after 36-33 subframes 45 °, 45 °, 135 °, 135 ° 8 Next MIB present after 32-29 subframes 45 °, 45 °, 135 °, 225 ° 9 Next MIB exists after 28-25 subframes 45 °, 45 °, 135 °, 315 ° 10 Next MIB present after 24 to 21 subframes 45 °, 45 °, 225 °, 135 ° 11 Next MIB present after 20-17 subframes 45 °, 45 °, 225 °, 225 ° 12 Next MIB present after 16-13 subframes 45 °, 45 °, 225 °, 315 ° 13 Next MIB present after 12-9 subframes 45 °, 45 °, 315 °, 135 ° 14 Next MIB present after 8-5 subframes 45 °, 45 °, 315 °, 315 ° 15 Next MIB present after 4-1 subframe

In the case of phase demodulation of DwPTS through cell search, the first four demodulated contiguous phases are 45 °, 135 °, 135 °, and 45 ° (four-bit quaternary sequence 1,2,2,1 to QPSK phase). In the case of mapping), the position of the subframe that satisfies this is possible because only the 61th subframe is possible in the 59th subframe, so that the current position can be known, and the information that the MIB comes after the 4th subframe can also be known. In the above case, assuming that the size of the multiframe is 32 frames, the start position of the multiframe is also 4 subframes later. Even if the size of the multiframe is 8 or 16 frames, the start position of the multiframe is 4 subframes later. It can be seen that.

As another example, if the continuous phase demodulation of four consecutive DwPTSs is confirmed with 45 °, 135 °, 135 °, and 315 ° (the four-bit quaternary sequence 2,1,1,2 is mapped to QPSK phase) Only the 12th subframe in the ninth subframe has a unique 4-bit quadruple sequence. Therefore, it can be seen that after demodulation of four phases, the MIB is the 12th subframe at the current position and the MIB is 53 subframes later. In the above case, assuming that the size of the multi-frame is determined to be 32 frames, the start position of the multi-frame is also 53 subframes. If the size of the multi-frame is 16 frames, the start position of the multi-frame is 21 subframes. If the size of the multiple frames is 8 frames, the starting position of the multiple frames is 5 subframes later.

The following embodiments describe an example of a method of notifying a user equipment through a physical channel of transmission diversity of a P-CCPCH using another separate sequence. When four consecutive modulated phases are found, the included sequence is unique to one of the two sequences, and thus the UE can determine whether to use transmit diversity. Examples of the 16-bit, 32-bit and 64-bit sequences used in Embodiments 1 to 3 as well as other 16-bit, 32-bit and 64-bit 4-members that do not include the 4-bit 4-member sequences contiguous with the sequences. The sequence is used for the case where the transmit diversity of P-CCPCH is used.

The fourth embodiment describes a case where the period of the MIB is eight frames. Since the MIB should always be included in the first BCH in the multi-frame structure and transmitted, when the MIB period is 8 frames, the period of the multi-frame should be 8 frames or less. As shown in Table 3 below, when phase modulation is used according to the period of the MIB, the current position, the position of the MIB, and the starting position of the multiple frames can be known through the demodulation of four subframes. do. Table 3 below maps only 16 bits after the 32-bit quadruple sequence shown in FIG. 10A to QPSK phase modulation.

Phase quadruple (SFN / 2) mod 4 Remarks No transmit diveristy Transmit diveristy 45 °, 45 °, 225 °, 225 ° 45 °, 225 °, 315 °, 225 ° 0 Current MIB present, next MIB present after 16-13 subframes 45 °, 45 °, 225 °, 315 ° 45 °, 225 °, 135 °, 135 ° One Next MIB present after 12-9 subframes 45 °, 45 °, 315 °, 135 ° 45 °, 225 °, 135 °, 315 ° 2 Next MIB present after 8-5 subframes 45 °, 45 °, 315 °, 315 ° 45 °, 225 °, 315 °, 315 ° 3 Next MIB present after 4-1 subframe

FIG. 11 shows the current position and position of the MIB, and the starting position of the multiple frames in the multiple frames through phase demodulation of the DwPTS in four consecutive subframes when the MIB is repeated in a period of 8 frames, and also the transmission for the P-CCPCH. The process of notifying diversity is shown. In the case of phase demodulation of DwPTS through cell searching, the first demodulated phase is located in the second subframe as shown in 1101. When transmission diversity is not used in P-CCPCH, four consecutive subframe demodulations are performed. It can be seen that the four consecutive phases through 45 °, 135 °, 135 °, 45 ° (mapping 4-bit quaternary sequences 1,2,2,1 to QPSK phase). Since the position having the four consecutive phase values is only the fifth subframe in the second subframe, the current position can be known, and the information that the MIB comes after 12 subframes is also known. In the above case, assuming that the size of the multi-frame is determined to be 8 frames, the starting position of the multi-frame is also 12 subframes. If the size of the multi-frame is 4 frames, the starting position of the multi-frame is 4 sub-frames. Can be. When transmission diversity is used when four consecutive phases from 1101 to 1102 are found, the phase sequence is 225 °, 135 °, 315 °, and 45 ° (4-bit quaternary sequence 3, 2, 4, 1 is mapped to the QPSK phase). When the UE finds the four consecutive sequence sequences, it is possible to confirm the use of transmit diversity of the P-CCPCH.

When the phase demodulation of four consecutive DwPTSs found from a certain moment by the UE indicates 135 °, 135 °, 45 °, and 225 ° (the four-bit quadruple sequence 2,2,1,3 is mapped to the QPSK phase). In Table 6, it is only possible that the current position is in the 10th subframe from the 7th subframe while using transmit diversity. Therefore, in the case of having the 4-bit quaternary sequence value, it can be seen that transmission diversity is currently used in the P-CCPCH together with the fact that the current position is the 10th subframe and the next MIB is 7 subframes later. .

The fifth embodiment describes the case where the period of the MIB is 16 frames. Since the MIB should always be included in the first BCH in the multi-frame structure and transmitted, when the MIB period is 16 frames, the period of the multi-frame should be 16 frames or less. As shown in Table 3 below, when phase modulation is used according to the period of the MIB, the current position, the position of the MIB, and the starting position of the multiple frames can be known through the demodulation of four subframes. do. Table 3 below maps the 32-bit quaternary sequence shown in FIG. 10A to QPSK phase modulation.

Phase quadruple (SFN / 2) mod 8 Remarks No transmit diversity Transmit diversity 45 °, 45 °, 135 °, 135 ° 45 °, 225 °, 225 °, 225 ° 0 MIB present, next MIB present after 32-29 subframes 45 °, 45 °, 135 °, 225 ° 45 °, 225 °, 225 °, 135 ° One Next MIB exists after 28-25 subframes 45 °, 45 °, 135 °, 315 ° 45 °, 225 °, 225 °, 315 ° 2 Next MIB present after 24 to 21 subframes 45 °, 45 °, 225 °, 135 ° 45 °, 225 °, 135 °, 225 ° 3 Next MIB present after 20-17 subframes 45 °, 45 °, 225 °, 225 ° 45 °, 225 °, 315 °, 225 ° 4 Next MIB present after 16-13 subframes 45 °, 45 °, 225 °, 315 ° 45 °, 225 °, 135 °, 135 ° 5 Next MIB present after 12-9 subframes 45 °, 45 °, 315 °, 135 ° 45 °, 225 °, 135 °, 315 ° 6 Next MIB present after 8-5 subframes 45 °, 45 °, 315 °, 315 ° 45 °, 225 °, 315 °, 315 ° 7 Next MIB present after 4-1 subframe

When demodulating DwPTS through cell search, the first demodulated phase is located in the second subframe and when transmit diversity is not used in P-CCPCH, four consecutive subframes are demodulated in Table 7. It can be seen that four consecutive phases are 45 °, 135 °, 135 °, and 45 ° (mapping 4-bit quaternary sequences 1,2,2,1 to QPSK phase). Since the position having four consecutive phase values is only the fifth subframe in the second subframe, the current position can be known, and the information that the MIB comes after 28 subframes is also known. In the above case, assuming that the size of the multiframe is set to 16 frames, the starting position of the multiframe is also after 28 subframes. If the size of the multiframe is 8 frames, the starting position of the multiframe is 12 subframes. Can be. If transmit diversity is used when the four consecutive phases are found, the phase sequence is 225 °, 135 °, 315 °, and 45 ° in Table 7 (4-bit quaternary sequence 3, 2, 4, 1). Is mapped to the QPSK phase). When the UE finds the four consecutive sequence sequences, it is possible to confirm the use of transmit diversity of the P-CCPCH.

When the phase demodulation of the four consecutive DwPTSs found from a certain moment by the UE indicates 315 °, 45 °, 225 °, and 135 ° (the four-bit quadruple sequence 4,1,3,2 is mapped to the QPSK phase). In Table 7, it can be seen that the case where the current position is in the 15th subframe from the 12th subframe while using transmit diversity is unique. Therefore, in the case of having the 4-bit quaternary sequence value, it can be seen that transmission diversity is currently used in the P-CCPCH with the fact that the current position is the 15th subframe and the next MIB is 18 subframes. .

The sixth embodiment describes a case in which the period of the MIB is 32 frames. If the period of the MIB is 32 frames, the period of the multiple frames should be 32 frames or less. As shown in Table 5, when phase modulation is used according to the period of the MIB, the current position, the position of the MIB, and the starting position of the multiple frames can be known through the demodulation of four subframes. do. Table 3 below is a 64-bit 4-way sequence using the 32-bit 4-way sequence shown in FIG. 10 (b) and the 32-bit 4-way sequence shown in FIG. .

Phase quadruple (SFN / 2) mod 16 Remarks No Transmit diversity Transmit diversity 45 °, 135 °, 135 °, 135 ° 45 °, 315 °, 315 °, 315 ° 0 MIB present, next MIB present after 64 to 61 subframe 45 °, 135 °, 135 °, 225 ° 45 °, 315 °, 315 °, 225 ° One Next MIB present after 60-57 subframes 45 °, 135 °, 135 °, 315 ° 45 °, 315 °, 315 °, 135 ° 2 Next MIB present after 56-53 subframes 45 °, 135 °, 225 °, 135 ° 45 °, 315 °, 225 °, 315 ° 3 Next MIB present after 52-49 subframes 45 °, 135 °, 315 °, 135 ° 45 °, 315 °, 135 °, 315 ° 4 Next MIB present after 48-45 subframes 45 °, 135 °, 225 °, 225 ° 45 °, 315 °, 225 °, 225 ° 5 Next MIB present after 44-41 subframes 45 °, 135 °, 225 °, 315 ° 45 °, 315 °, 225 °, 135 ° 6 Next MIB present after 40-37 subframes 45 °, 135 °, 315 °, 315 ° 45 °, 315 °, 225 °, 225 ° 7 Next MIB present after 36-33 subframes 45 °, 45 °, 135 °, 135 ° 45 °, 225 °, 225 °, 225 ° 8 Next MIB present after 32-29 subframes 45 °, 45 °, 135 °, 225 ° 45 °, 225 °, 225 °, 135 ° 9 Next MIB exists after 28-25 subframes 45 °, 45 °, 135 °, 315 ° 45 °, 225 °, 225 °, 315 ° 10 Next MIB present after 24 to 21 subframes 45 °, 45 °, 225 °, 135 ° 45 °, 225 °, 135 °, 225 ° 11 Next MIB present after 20-17 subframes 45 °, 45 °, 225 °, 225 ° 45 °, 225 °, 315 °, 225 ° 12 Next MIB present after 16-13 subframes 45 °, 45 °, 225 °, 315 ° 45 °, 225 °, 135 °, 135 ° 13 Next MIB present after 12-9 subframes 45 °, 45 °, 315 °, 135 ° 45 °, 225 °, 135 °, 315 ° 14 Next MIB present after 8-5 subframes 45 °, 45 °, 315 °, 315 ° 45 °, 225 °, 315 °, 315 ° 15 Next MIB present after 4-1 subframe

When demodulating DwPTS through cell search, the first demodulated phase is located in the second subframe and when transmit diversity is not used in P-CCPCH, four consecutive subframes are demodulated in Table 7. It can be seen that four consecutive phases are 135 °, 135 °, 135 °, and 45 ° (mapping 4-bit quaternary sequence 2,2,2,1 to QPSK phase). Since the position having four consecutive phase values is only the fifth subframe in the second subframe, the current position can be known, and the information that the MIB comes after 60 subframes is also known. In the above case, assuming that the size of the multi-frame is determined to be 32 frames, the starting position of the multi-frame is also 60 subframes. If the size of the multi-frame is 16 frames, the starting position of the multi-frame is 28 sub-frames. Can be. If the size of the multiple frames is 8 frames, it can be seen that the starting position of the multiple frames is 12 subframes later. If transmit diversity is used when the four consecutive phases are found, the phase sequence is shown in Table 7 as 315 °, 315 °, 315 °, and 45 ° (4-bit quaternary sequence 4, 4, 4, 1). Is mapped to the QPSK phase). When the UE finds the four consecutive sequence sequences, it is possible to confirm the use of transmit diversity of the P-CCPCH.

When the phase demodulation of four consecutive DwPTSs found from a certain moment by the UE indicates 225 °, 135 °, 45 °, and 225 ° (mapping 4-bit quaternary sequence 3,2,1,3 to QPSK phase) In Table 7, it can be seen that the case where the current position is in the 42nd subframe from the 39th subframe while using transmit diversity is unique. Therefore, in the case of having the 4-bit quaternary sequence value, it can be seen that transmission diversity is currently used in the P-CCPCH with the fact that the current position is the 42nd subframe and the next MIB is 23 subframes. .

As described above, according to the present invention, multi-frame identification is possible using only four phase modulation angles, and thus, cell searching can be performed more quickly. On the other hand, there is an advantage that can simplify the control for the identification of the multi-frame in the transmitter of the base station for transmitting the multi-frame and the receiver of the terminal for receiving the multi-frame. In addition, the use of the transmit diversity indicator function for the P-CCPCH can be confirmed more quickly and accurately whether or not to use the transmit diversity, it can be seen that the performance in the reception of the P-CCPCH.

Claims (6)

In a phase modulation method in a base station of a mobile communication system for transmitting a phase-modulated synchronization code by a plurality of phase modulation angles in order for the terminal to detect the position of the main information block from the received signal, Inputting main information block transmission position information, and determining a predetermined number of phase modulation angles based on the main information block transmission position information; And performing phase modulation on the synchronization codes of the subframe to be transmitted and the subframes to be transmitted consecutively to the subframe to be transmitted by the determined number of phase modulation angles. The method of claim 1, Wherein the predetermined number of phase modulation angles comprise four phase modulation angles, wherein a first phase modulation angle of the four phase modulation angles is 45 degrees. A method for determining a position of a subframe including a main information block to be received next by a base station receiving a signal in which a synchronization code of a subframe unit is phase-modulated by a plurality of phase modulation angles in a terminal of a mobile communication system , Demodulating a phase modulation angle used in the phase modulated synchronization code of the at least one subframe received; The demodulated phase modulation angle is compared with the stored phase modulation angles, and based on the result of the comparison, it is determined whether the received subframe is a plurality of frames among the plurality of frames, and has a main information block to be received next. Determining the position of the frame. In a phase modulation method in a base station of a mobile communication system for transmitting a phase-modulated synchronization code by a plurality of phase modulation angles in order for the terminal to detect the position of the main information block from the received signal, A control unit for inputting main information block transmission position information and determining a predetermined number of phase modulation angles based on the main information block transmission position information; The phase-modulated angles of the predetermined number of phase modulation angles from the controller are continuously input, and the phase-modulation codes of the subframes to be transmitted and the subframes to be transmitted successively to the subframe are to be transmitted in the sync code unit. And a phase modulator for phase modulating by a corresponding phase modulation angle of the angles. The method of claim 4, wherein Wherein said phase modulation angles comprise four phase modulation angles, wherein a first phase modulation angle of said four phase modulation angles is 45 degrees. An apparatus for determining a location of a subframe including a main information block to be received next by a base station receiving a signal in which a synchronization code of a subframe is phase-modulated by a plurality of phase modulation angles in a terminal of a mobile communication system. , A phase demodulator for demodulating a phase modulation angle used in the phase modulated synchronization code of the at least one subframe received; The demodulated phase modulation angle is compared with the stored phase modulation angles, and based on the result of the comparison, it is determined whether the received subframe is a plurality of frames among the plurality of frames. And a detector for determining the position of the frame.