KR100663441B1 - Method and apparatus for reporting the use of transmission diversity in narrowband time division duplexing code division multiple access communication system - Google Patents

Abstract

The present invention relates to a primary common control physical channel ("P-CCPCH") in a narrow band time division duplexing ("NB-TDD") code division multiple access communication system. The present invention relates to a phase modulation method of a SYNC code transmitted in downlink pilot time slot (DwPTS) when transmitting using transmit diversity. The present invention provides a method for transmitting or receiving P-CCPCH using transmit diversity by providing a diversity indicator for changing a phase change of the SYNC code included in the DwPTS.

P-CCPCH, DwPTS, SYNC, transmit diversity, phase modulation

Description

Method and device for reporting whether transmission diversity is used in narrowband time division duplexing code division multiple access communication system {PHASING MODULATION SCHEME OF DwPTS FOR TRANSMIT DIVERSITY IN NARROW BAND TIME DIVISION DUPLEXING}

1 is a diagram illustrating a structure of a frame used in a conventional narrowband time division duplexing (NB-TDD) code division multiple access communication system.

FIG. 2 is a control flowchart illustrating a typical cell search process performed by a terminal of a narrowband time division duplexing (NB-TDD) code division multiple access communication system to acquire base station information.

3 is a diagram illustrating a configuration of an apparatus for determining whether to use transmit diversity of a first common control physical channel using transmit diversity according to an embodiment of the present invention.

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

5 is a diagram illustrating a configuration of a terminal receiver for receiving a first common control physical channel signal based on whether transmit diversity is used according to an embodiment of the present invention.

The present invention relates to transmit diversity in a narrowband time division duplexing (NB-TDD) code division multiple access communication system, and in particular, a signal transmitted on a first common control physical channel (P-CCPCH), which is one of downlink common channels. An apparatus and method for selecting whether or not to use transmit diversity of an apparatus are provided.

In general, transmit diversity is one of methods implemented for accurate transmission of information, and is mainly applied to a channel for transmitting important data to which incorrect transmission should not be made.

FIG. 1 shows the structure of a frame used in an NB-TDD code division multiple access communication system. In this case, information transmission is performed by the P-CCPCH only through the first and second frames among the various frames constituting the multiframe. The information transmitted by the P-CCPCH includes broadcast channel (BROADCAST CHANNEL: hereinafter referred to as "BCH") information. That is, BCH information is transmitted through a P-CCPCH in a section in which a data symbol of 0 timeslot downlink of each subframe is transmitted. 102 of FIG. 1 shows the structure of the first frame among the frames constituting the multi-frame shown in 101. One frame shown in 102 is 10ms long and consists of two subframes.

103 shows the structure of one subframe among the two subframes included in 102. One subframe has a length of 5 ms and there are seven timeslots therein. Each timeslot is used for uplink or downlink transmission. The timeslot is only capable of one-way transmission up or down in one slot. In addition, the system operator may arbitrarily set how many timeslots of seven timeslots in one subframe are used for uplink or downlink transmission. Between the first time slot and the second time slot, the DwPTS of 96-chips section, the guard period ("GP") of 96-chips section, and the uplink pilot time slot (UpPTS) of 160-chips section (UpPTS) This is included. The DwPTS is used for initial cell search, synchronization, or channel estimation in a terminal, and the UpPTS is used for channel estimation in a base station.

104 shows the detailed structure of the timeslot and DwPTS shown in 103 above. The total length of each time slot is 864 chips as shown in 104 of FIG. 1, and is composed of two 352 chip data symbol sections, 144 chips midamble between them, and 16 chips GP at the end. The midamble is used when the terminal estimates which channels are transmitted from the base station and the channel environment with the base station in the case of timeslots transmitted downward from the base station. The midamble is analyzed to estimate which terminal is transmitting the channel and the channel environment of the terminal and the base station. In addition, the midamble may be used for the purpose of estimating which channel or which subscriber transmits if it corresponds to each uplink and downlink transmission channel. The GP has a length of 16 chips and serves to distinguish each time slot.

As shown in 104 of FIG. 1, the DwPTS has a total of 96 chips, and is composed of a 32 chip GP and a 64 chip synchronization code (hereinafter referred to as "SYNC"). The SYNC is used not only to synchronize but also to inform information about the first timeslot in one subframe.

In the NB-TDD code division multiple access communication system, the P-CCPCH transmits a BCH in a transport channel. The BCH information is required for base station synchronization and base station information acquisition.

2 illustrates a flow of a cell search process, which is a process of acquiring base station synchronization and base station information, and may be divided into four steps. The first step is to receive the base station information that currently belongs, and the second step is to identify the scrambling and basic midamble code being used. The third step is to achieve synchronization for the multiframe, and the final fourth step is to access the information transmitted through the broadcast channel.

The first step shown in FIG. 2 of FIG. 2 is a DwPTS search process, in which the UE finds a SYNC code among the signals received in the DwPTS using a matched filter. There are 32 kinds of synchronization codes (SYNC codes) and are used for synchronization between a terminal and a base station. In addition, since each base station uses only one synchronization code (SYNC code) of 32, the terminal checks the SYNC code used by the base station to which it belongs.

Operation 202 of FIG. 2 is a step of identifying the scrambling code and the basic midamble code. One SYNC corresponds to four basic midambles, and since the UE continues to receive the midambles from the synchronized base stations, it identifies one of the four basic midambles that matches the base station. Since each of the basic midambles has a one-to-one correspondence with a scrambling code, the terminal identifies the scrambling code used by the base station together with the basic midamble.

Operation 203 of FIG. 2 is a control step of multi-frame synchronization. As shown in 101 of FIG. 1, a plurality of frames are gathered to form a multi-frame structure. In this step, a process of synchronizing the multi-frames is performed. That is, to find the beginning and end of the multiframe. In the above step, through the QPSK phase demodulation of the received signal to the DwPTS, the P-CCPCH signal is included according to the combined value of each phase demodulation value, so that the transmitted frame is known and thus, the first frame of the multiframe is indicated. do. The signals received in the DwPTS are QPSK phase-modulated so that each frame in one multi-frame is in order so that the UE can find the beginning and end of the multi-frame.

The final fourth step is to read the BCH information as shown at 204 of FIG. Through the previous three steps, the synchronization between the terminal and the base station is correct, the terminal knows the scrambling code used by the base station, and the synchronization of the multi-frame is the terminal is included in the first time slot of the first two frames of the multi-frame P- The cell search process is completed by receiving the CCPCH signal to obtain information of the base station.

Currently, it is not yet considered to use transmission diversity for signals transmitted through P-CCPCH in an NB-TDD code division multiple access communication system. This is because a downlink dedicated physical channel (DL-DPCH) is generally transmitted to each UE through beamforming, so that intra-cell interference is not relatively large. . It is therefore based on the fact that the common channel does not need to use transmit diversity. However, when the intensity of interference increases, such as in an urban area or when inter-cell interference cannot be avoided, it may be necessary to increase the transmission gain of a common channel such as P-CCPCH. . Therefore, as described above, when transmission diversity is not used in the first common control physical channel, there is a problem in that a good transmission gain cannot be obtained. In such a case, a method for easily obtaining a transmission gain can be found by using transmission diversity. However, such a method is not currently defined.

Accordingly, an object of the present invention is to provide an apparatus and method for transmitting P-CCPCH using transmit diversity in an NB-TDD code division multiple access communication system.

Another object of the present invention is to provide an apparatus and method for obtaining a transmission gain by using transmission diversity in a P-CCPCH.

It is still another object of the present invention to identify whether transmission diversity is caused by a terminal using different phase modulation of a signal transmitted through DwPTS during multi-frame synchronization according to whether transmit diversity is used when transmitting P-CCPCH. It is to provide an apparatus and method that can be.
In a first aspect to achieve the above, the present invention provides a method for informing a receiver that a transmitter of a mobile communication system transmits a first common control physical channel using transmit diversity, wherein a plurality of phase modulations are provided. Extract combinations to be applied when using transmit diversity among combinations by angles, select one of the combinations when the first common control physical channel is transmitted using transmit diversity, and forward A synchronization code to be transmitted through a pilot time slot is divided by the number of phase modulation angles constituting the combination, and each of the divided synchronization codes is phase modulated by a corresponding phase modulation angle among the phase modulation angles constituting the selected combination and transmitted. The combinations to be applied in the case of using the transmit diversity do not use the transmit diversity. In this case, the transmission diversity usage reporting method is implemented so that it does not overlap with the combinations to be applied.
In a second aspect to achieve the above, the present invention relates to a method of receiving and reporting whether a transmitter transmits a first common control physical channel using transmission diversity in a receiver of a mobile communication system. Receiving synchronization codes transmitted over the network, detecting phase modulation angles used to phase modulate each of the received synchronization codes, and wherein the combination of the detected phase modulation angles uses transmit diversity Determine whether it belongs to the applied combinations, and if it belongs to the combinations applied in the case of using the transmission diversity, it is determined that transmission diversity is used to transmit the first common control physical channel, and the transmission diversity Combinations that apply when using city do not use the transmit diversity. In this case, a transmission diversity reporting method is implemented so as not to overlap with the combinations applied in the case.
In a third aspect to achieve the above, the present invention provides a device for informing a receiver that a transmitter of a mobile communication system transmits a first common control physical channel using transmit diversity, wherein a plurality of phase modulations are provided. Extract combinations to be applied when using transmit diversity among the combinations by angles, and select one of the combinations when the first common control physical channel is transmitted using transmit diversity, and A transmit diversity controller for sequentially outputting phase modulation angles constituting the selected combination; And a synchronization code to be transmitted through a forward pilot time slot is sequentially divided by the number of phase modulation angles constituting the combination, and the input division synchronization code is phased by the phase modulation angle provided from the transmission diversity controller. Implement a phase diversity unit for modulating and outputting a phase modulation unit, and the combinations to be applied when the transmission diversity is used does not overlap with the combinations to be applied when the transmission diversity is not used. It was.

In a fourth aspect for achieving the foregoing, the present invention relates to a device for receiving a report of whether a transmitter transmits a first common control physical channel using transmission diversity in a receiver of a mobile communication system, the plurality of forward pilot time slots. A phase demodulator for receiving the synchronization codes transmitted through the apparatus and detecting phase modulation angles used to phase modulate each of the received synchronization codes; And checking whether the combination consisting of the detected phase modulation angles belongs to combinations applied when using transmit diversity, and if belonging to combinations applied when using transmit diversity, the first Composed of a transmission diversity detector for determining that the transmission diversity is used to transmit a common control physical channel, the combinations applied when using the transmission diversity is a combination applied when not using the transmission diversity A transmission diversity report is implemented to prevent duplication.

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

According to the present invention, a method of transmitting BCH information through P-CCPCH using transmission diversity is based on a combination of phases in phase modulation of a signal transmitted to DwPTS in each subframe when transmission diversity is not used. In this case, the signal transmitted to the DwPTS in another combination is subjected to QPSK phase modulation.

Currently, the NB-TDD code division multiple access communication system uses a 64 chip SYNC code in a signal received at DwPTS shown in 104 of FIG. 1 for multi-frame synchronization. The multi-frame structure has a rule of phase modulation in which the SYNC code is constant in 16 frame periods. Table 1 below shows a phase modulation rule of a signal transmitted to a DwPTS including each SYNC code. First of all, the 64 chip SYNC codes are QPSK phase-modulated at four angles corresponding to the four values shown in column 1 of Table 1 below. That is, since each frame knows its own system frame number ("SFN"), it divides SYNC code 64 chip into 16 chip code by 4 according to (SFN / 2) mod 8 value. QPSK phase modulation is achieved through the four phase modulation angles shown in. As described above, the multi-frame structure has a period of 16 frames and uses different phase modulation angles for each of the two frames. The terminal demodulates the SYNC code received by the DwPTS to find the phase modulation angle. It's easy to see where you are in.

Phase Modulation Angle (4 * 16 Chips = 64 Chips) (SFN / 2) mod 8 45,225,225,225 0 (BCH is here) 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

The present invention provides a method for identifying whether P-CCPCH uses transmit diversity by changing a phase modulation rule in multi-frame synchronization according to the phase modulation angle described above. The four possible modulation angles are 45 degrees, 135 degrees, 255 degrees, and 315 degrees. Therefore, 256 combinations of phase modulation angles of the 16-chip * 4 SYNC code are 4 * 4 * 4 * 4. Accordingly, 248 combinations may be made except for the eight combinations of the phase modulation angles shown in Table 1 above. The present invention finds the most suitable combination among the 248 redundant combinations and uses them as an indicator combination in case of using transmit diversity. Alternatively, a total of 256 combinations may be selected and used for 16 combinations, including eight new combinations for which no transmission diversity is used and another eight combinations for using transmission diversity. In other words, in order to indicate through the phase modulation combination of the Sync Code transmitted through DwPTS that the signal transmitted through the P-CCPCH is using Tx Diversity, the combination of the phase modulation value when the current Tx Diversity is not used is overlapped. Eight combinations of unused uses are possible.

3 is a diagram illustrating a change in the apparatus when the base station uses transmit diversity. 301 of FIG. 3 is an input SYNC code, and the 301 SYNC code is an input of a shift register of 302. The shift register cuts the 64 chip SYNC code by 16 chips and sends them to the output. The output of 302 is divided into an I channel and a Q channel, and the two channels are multiplied by a value, g ₁ , g ₂ , corresponding to the phase modulation angles defined in Table 1 above. If transmit diversity is used, a value suitable for the phase modulation angle to be described in the following embodiments should be multiplied. The I channel is multiplied by g ₁ at 303 and the Q channel is multiplied by g ₂ at 304. The g ₁ , g ₂ values used in the device are declared in Table 2 below. According to the declared values of Table 2, the g ₁ , g ₂ values are controlled in 305 of FIG. 3. That is, depending on whether transmit diversity is used or not, g ₁ and g ₂ values are designated as values to be declared in some embodiments below in the transmit diversity enable / disable controller 305. Transmit diversity Enable / Disable the controller 305 according to the respective phase value in the case of using the table, and transmit diversity of the g _1, g ₂ value of the respective phase value in the case that does not use transmit diversity g _1, The table for g ₂ values must be stored in internal memory. That is, the transmit diversity enable / disable controller 305 refers to the phase modulation angle stored in the internal memory according to whether to apply the transmit diversity (Tx Diversity) to the P-CCPCH transmission signal and the I channel phase modulator 303; The Q channel phase modulator 304 provides a phase modulated value.

The Q channel signal output from the 304 Q channel phase modulator is multiplied by j and added to the I channel signal output from the 303 I channel phase modulator. The signal I + jQ is a 32-chip GP signal and a time of 306 multiplexer. The signal is multiplexed to form a signal transmitted through the DwPTS, which enters the input of the 406-time multiplexer of FIG.

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

Currently, since NB-TDD system does not have specific details about transmit diversity, if transmit diversity is used, the transmit diversity technique as shown in FIG. 4 may be used. The method described in FIG. 4 is a block space-time transmission diversity for P-CCPCH used in wideband time division duplexing (WB-TDD) code division multiple access communication system. transmit diversity: " STTD " The STTD encoder 401 of FIG. 4 generates one or two orthogonal signals using the input P-CCPCH signal 400. At this time, when the transmission diversity is used under the control of the transmission diversity controller 305 of FIG. 3, the STTD encoder 401 generates and outputs two orthogonal signals using the P-CCPCH signal as an input. However, in the general case in which transmission diversity is not used, the STTD encoder 401 does not work and outputs the input P-CCPCH signal as the first output as it is, and does not use the second output. The transmit diversity enable / disable controller 305 according to the pattern of the phase modulation value of the transmit diversity according to the pattern of the phase modulation value of the SYNC code signal to be transmitted through DwPTS regardless of which transmit diversity the base station uses. Will provide a value.

The following description assumes the case of using transmit diversity. When transmit diversity is used, two orthogonal signals are output from the block STTD encoder 401, and the two signals are spread to the same OVSF code in the multiplier 421 and the multiplier 422 of FIG. 4, and then the same scrambling code in the multiplier 423 and the multiplier 425. Scrambled into. The output signal of multiplier 423 is multiplexed with midamble 1 of 402 at multiplexer 404 and the output signal of multiplier 425 is multiplexed with midamble 2 of 403 at multiplexer 405. Here, midamble 1 and midamble 2 use the same code, but different codes may be used. The signal multiplexed at the multiplexer 404 is multiplexed with signals of other channels at the time multiplexer 406. The second common control physical channel (hereinafter referred to as "S-CCPCH") of the 411 including the signal transmitted through the DwPTS output of the multiplexer 306 of FIG. 3, and the DPCH of the 413 The signal is time multiplexed at this 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 the first antenna of 408. The output of the multiplexer 405 is also time-multiplexed in another signal, ie, signals transmitted via DPCH of 414, S-CCPCH of 412 and the like, and is time-multiplexed by the time multiplexer 407 and transmitted by the second antenna of 409. The signals transmitted through the DPCH of 414 and the S-CCPCH of 412 are also signals that have been encoded, channelized, and scrambling when using transmit diversity, similarly to the signals transmitted through the P-CCPCH.

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. 2. Through the combination of the phase modulation angles found above, it is possible to determine whether the signal received through the P-CCPCH performed at 204 of FIG. 2 uses transmission diversity.

In FIG. 5, a terminal processes a signal received from a base station. The signal received at antenna 501 is received at 502 DwPTS at 502 demultiplexer, signal received at 504 P-CCPCH, signal received at 505 S-CCPCH, and received at 506 DPCH. Divided into signals. The signal received at DwPTS of 503 is further divided into 508 GP signals and 509 SYNC codes in 507 demultiplexer. Since the SYNC code is QPSK phase modulated, the phase demodulator of 520 finds the phase of the SYNC code. The phase value found at 520 determines whether the P-CCPCH is using transmit diversity at the transmit diversity usage detector of 521. As in 305 of FIG. 3, the transmit diversity use detector 521 should store a table for phase values when transmit diversity is not used and a table for phase values when transmit diversity is used in a memory. That is, when the transmit diversity use detector 521 does not use the table and the transmit diversity for the phase value when using the transmit diversity storing the demodulated value demodulated from the phase demodulator 520 in its memory. A search is performed on a table of phase values, and the comparison is made with the phase demodulation value of the received SYNC code signal to determine whether the signal transmitted through the P-CCPCH at the base station is using transmit diversity and which frame is used. Make it possible. The transmission diversity usage detector 521 provides the control signal to the demultiplexer 522 through the above determination. The demultiplexer 522 descrambles the signal 504 received through the P-CCPCH divided from the demultiplexer 502 with a scrambling code of 510 and receives a signal despread with the OVSF code of 511 as an input. The demultiplexer 522 outputs 523 when receiving the control signal indicating that transmit diversity is not used from the transmit diversity use detector 521 and outputs when receiving the control signal that transmit diversity is used from the transmit diversity use detector 521. Is 524. When transmit diversity is used, the output 524 of 522 is STTD decoded in the STTD soft decoder 525 and obtains two outputs of 531 and 532. The STTD soft decoder 525 performs STTD decoding using the channel estimation signal provided from the channel estimator 526. In another embodiment, even if the base station transmits using another transmit diversity method, the transmit diversity usage detector 521 is a phase of the SYNC code signal received through DwPTS regardless of which transmit diversity the base station uses. The transmission diversity is determined according to the pattern of the demodulation value.

Hereinafter, a method for identifying whether transmission diversity is used according to the present invention will be described with reference to the first, second, and third embodiments. In the following embodiment, the Tx Diversity is used to indicate that the signal transmitted through the P-CCPCH is using Tx Diversity through the phase modulation pattern of the Sync Code transmitted through DwPTS. Eight patterns for use that do not overlap with the pattern of the phase modulation value when not used are shown. In addition, there should be no overlap between the eight patterns for the non-overlapping use. Unlike the following example, the present invention does not overlap with the case of not using Tx Diversity, and any pattern can be used unless the pattern overlaps with each other. In the case of the phase modulation value pattern using Tx Diversity, the embodiment in which the phase angle of the first 16 chips is fixed, if the terminal knows that the first phase value is fixed, the phase detection of the terminal It is to be noted that the fast has an advantage, and patterns not shown below may also serve to transmit transmit diversity.

First embodiment

The first embodiment uses a phase modulation angle as shown in Table 2 below. That is, the phase angles of the first 16 chips are fixed at 45 degrees regardless of whether transmit diversity is used or not, and the phase angles of the next three 16-chip codes are changed. Therefore, a total of 64 patterns of 4 * 4 * 4 are possible. When transmission diversity is used, eight of 64-8 = 56 patterns can be selected and used as phase modulation angles. Table 3 below shows a method in which the first 16-chip code has a phase modulation angle of 45 degrees and the next three 16-chip codes are used for transmit diversity, regardless of whether transmit diversity is used or not. The case where the phase modulation value of is rotated by 180 degrees is used.

Phase modulation angle (SFN / 2) mod 8 Disable transmit diversity Use transmit diversity 45,225,225,225 45,45,45,45 0 45,135,135,225 45,315,315,45 One 45,135,225,135 45,315,45,315 2 45,315,225,315 45,135,45,135 3 45.225.135,315 45,45,315,135 4 45,225,315,315 45,45,135,135 5 45,225,225,135 45,45,45,315 6 45,225,225,315 45,45,45,135 7

Second embodiment

The second embodiment uses an angle obtained by adding 180 degrees to the phase modulation angle when the transmit diversity is not used. As shown in Table 3 below, the phase modulation angle using transmit diversity is symmetrical with respect to the origin compared to the phase modulation angle without using.

Phase modulation angle (SFN / 2) mod 8 Disable transmit diversity Use transmit diversity 45,225,225,225 225,45,45,45 0 45,135,135,225 225,315,315,45 One 45,135,225,135 225,315,45,315 2 45,315,225,315 225,135,45,135 3 45.225.135,315 225,45,315,135 4 45,225,315,315 225,45,135,135 5 45,225,225,135 225,45,45,315 6 45,225,225,315 225,45,45,135 7

Third embodiment

The third embodiment uses a phase modulation angle as shown in Table 5 below. In other words, when the transmit diversity is not used, the phase modulation angle of the first 16 chips is always fixed at 45 degrees. When using the transmit diversity, the phase modulation angles of the first 16 chips are all fixed at 225 degrees. For the three 16 chips described as 5 in x, the corresponding phase modulation angles are matched.

Phase modulation angle (SFN / 2) mod 8 Disable transmit diversity Use transmit diversity 45,225,225,225 225, x, x, x 0 45,135,135,225 225, x, x, x One 45,135,225,135 225, x, x, x 2 45,315,225,315 225, x, x, x 3 45.225.135,315 225, x, x, x 4 45,225,315,315 225, x, x, x 5 45,225,225,135 225, x, x, x 6 45,225,225,315 225, x, x, x 7

Fourth embodiment

In the fourth embodiment, even the phase modulation angle when no transmission diversity is used is corrected. As can be seen from the table, all angles are only 45 and 225 degrees. Since 16 patterns of total phase modulation angles, 2 * 2 * 2 * 2, are available, it is possible to create a pattern indicating whether transmit diversity is used. In this case, unlike the case in which four phase modulation angles are used in the first, second, and third embodiments, only two are used, so that the number of matching filters to be used is provided. Table 6 below illustrates an example of the method of the fourth embodiment.

Phase modulation angle (SFN / 2) mod 8 Disable transmit diversity Use transmit diversity 45,225,225,225 225,225,225,225 0 45,45,45,225 225,45,45,225 One 45,45,225,45 225,45,225,45 2 45,225,45,45 225,225,45,45 3 45,45,225,225 225,45,225,225 4 45,225,45,225 225,225,45,225 5 45,225,225,45 225,225,225,45 6 45,45,45,45 225,45,45,45 7

As described above, when the P-CCPCH, which is one of the common channels, is to be transmitted using transmit diversity, the base station has an effect of adding transmit diversity to a signal and transmitting the same. Therefore, when using transmit diversity, the transmission gain can be seen in a noisy area such as interference, thereby improving common channel reception performance. The present invention also provides a method for the UE to easily determine whether or not to use the diversity has the effect that it is possible to obtain an improvement in the reception performance without any special changes to the current device.

Claims (34)

delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete A method for informing a receiver that a transmitter of a mobile communication system transmits a first common control physical channel using transmit diversity, Extract combinations to apply when using transmit diversity among combinations of the plurality of phase modulation angles; Select one of the combinations when the first common control physical channel is transmitted using transmit diversity; Dividing a synchronization code to be transmitted through a forward pilot time slot by the number of phase modulation angles constituting the combination; Phase-modulate each of the divided synchronization codes by a corresponding phase modulation angle among phase modulation angles constituting the selected combination, and And the combinations to be applied in the case of using the transmit diversity are not overlapped with the combinations to be applied in the case of not using the transmit diversity. The method of claim 21, One of the combinations to be applied in the case of using the transmission diversity is selected using the following transmission diversity (Equation 1). Optional combination = (SNF / 2) mod 8 Where SNF is the unique number of the frame The method of claim 21, And the combination comprises four phase modulation angles. The method of claim 21, The synchronization code reporting method using the transmission diversity, characterized in that divided into units of 14 chips. In the method of receiving a report in the receiver of the mobile communication system whether the sender transmits the first common control physical channel using the transmission diversity, Receive synchronization codes transmitted over the plurality of forward pilot time slots; Detect phase modulation angles used to phase modulate each of the received synchronization codes; Confirming whether the combination consisting of the detected phase modulation angles belongs to combinations applied when using transmit diversity; If belonging to the combinations applied in the case of using the transmit diversity, it is determined that the transmit diversity is used to transmit the first common control physical channel, And the combinations applied in the case of using the transmit diversity are not overlapped with the combinations applied in the case of not using the transmit diversity. 27. The method of claim 25, wherein the synchronization code transmitted through each forward pilot time slot is 14 chips. 27. The method of claim 26, wherein the combination consists of four phase modulation angles. An apparatus for informing a receiver that a transmitter of a mobile communication system transmits a first common control physical channel using transmission diversity, Combinations to be applied in the case of using transmit diversity among combinations of a plurality of phase modulation angles are extracted, and when the first common control physical channel is transmitted using transmit diversity, one of the combinations is extracted. A transmission diversity control unit for selecting and sequentially outputting phase modulation angles constituting the selected combination; And A synchronization code to be transmitted through a forward pilot time slot is sequentially divided by the number of phase modulation angles constituting the combination, and the input division synchronization code is phase modulated by a phase modulation angle provided from the transmission diversity controller. It consists of a phase modulator for outputting And the combinations to be applied in the case of using the transmit diversity are not overlapped with the combinations to be applied in the case of not using the transmit diversity. The method of claim 28, And a combination of one of combinations to be applied in the case of using the transmission diversity is selected by Equation 2 below. Optional combination = (SNF / 2) mod 8 Where SNF is the unique number of the frame The method of claim 28, And the combination comprises four phase modulation angles. The method of claim 28, The synchronization code report whether or not the synchronization code is divided into units of 14 chips. An apparatus for receiving a report from a receiver of a mobile communication system whether a sender transmits a first common control physical channel using transmission diversity, A phase demodulator for receiving synchronization codes transmitted over a plurality of forward pilot time slots and detecting phase modulation angles used to phase modulate each of the received synchronization codes; And Check whether the combination of the detected phase modulation angles belongs to combinations applied when using transmit diversity, and if belonging to combinations applied when using transmit diversity, the first common A transmit diversity detector which determines that transmit diversity is used to transmit the control physical channel, And the combinations applied in the case of using the transmit diversity are not overlapped with the combinations applied in the case of not using the transmit diversity. 33. The apparatus of claim 32, wherein the synchronization code transmitted through each forward pilot time slot is 14 chips. 34. The apparatus of claim 33, wherein the combination consists of four phase modulation angles.

Images