KR100720570B1 - Method of frame synchronization and supporting compressed mode in mobile communicatin system - Google Patents

Abstract

The present invention relates to a next generation mobile communication system. In particular, a compression mode for frame synchronization by recovering a dedicated pilot pattern of a wideband code division multiple access method (hereinafter, referred to as W-CDMA) mobile communication system in units of frames in a compression mode. The present invention relates to a frame synchronization method using a pilot pattern.

On the other hand, in the present invention, even when the W-CDMA mobile communication system is operating in the compression mode, that is, even when all 15 slots are not transmitted in one frame, the complete frame sync word in units of frames is obtained by using the characteristic of the dedicated pilot pattern. The present invention provides a frame synchronization method using a pilot pattern in a compression mode in which frame synchronization is performed by using the correlation characteristics of the recovered frame synchronization word.

Frame Sync, Pilot Pattern, Compression Mode

Description

Method of frame synchronization and supporting compressed mode in mobile communicatin system}

일 경우에 3GPP 무선 접속 네트워크(RAN) 규격의 파일럿 패턴을 이용한 자기상관함수 특성을 나타낸 그래프.1A

In one case, a graph showing autocorrelation function characteristics using a pilot pattern of a 3GPP radio access network (RAN) standard.

일 경우에 3GPP 무선 접속 네트워크(RAN) 규격의 파일럿 패턴을 이용한 상호상관함수 특성을 나타낸 그래프.1B

In one case, a graph showing a cross-correlation function using a pilot pattern of a 3GPP radio access network (RAN) standard.

일 경우에 3GPP 무선 접속 네트워크(RAN) 규격의 파일럿 패턴을 이용한 자기상관함수 특성을 나타낸 그래프.2a

In one case, a graph showing autocorrelation function characteristics using a pilot pattern of a 3GPP radio access network (RAN) standard.

일 경우에 3GPP 무선 접속 네트워크(RAN) 규격의 파일럿 패턴을 이용한 상호상관함수 특성을 나타낸 그래프.2b is

In one case, a graph showing a cross-correlation function using a pilot pattern of a 3GPP radio access network (RAN) standard.

3 is a diagram illustrating a structure of an uplink dedicated physical channel (DPCH) according to a 3GPP radio access network (RAN) standard.

4 is a diagram illustrating a structure of a downlink dedicated physical channel (DPCH) according to a 3GPP radio access network (RAN) standard.

FIG. 5 is a diagram illustrating a STTD encoding principle in a downlink dedicated physical channel (DPCH) according to 3GPP radio access network (RAN) standard. FIG.

Fig. 6 is a diagram showing an apparatus configuration for recovering a pilot pattern used for frame synchronization of the present invention in the compression mode.

7 illustrates a configuration of a self-correlator for frame synchronization according to the present invention.

8 illustrates a configuration of a cross-correlator for frame synchronization according to the present invention.

The present invention relates to a next-generation mobile communication system, and more particularly, frame synchronization using a pilot pattern in a compression mode in which a dedicated pilot pattern of a W-CDMA mobile communication system recovers frame by frame in a mobile communication terminal operating in a compressed mode to achieve frame synchronization. It is about a method.

Recently, the Third Generation Partnership Project (hereinafter abbreviated as 3GPP) describes the definition and description of transport and physical channels for more advanced mobile communication. have.

Dedicated Physical Channels (DPCHs) are used for physical channels in uplink and downlink, which are typically superframes, radio frames, and timeslots. ) Consists of three hierarchical structures.

There are two types of Dedicated Physical Channels (DPCHs), Dedicated Physical Data Channels (DPDCH) and Dedicated Physical Control Channels (DPCCH). The dedicated physical data channel (DPDCH) is for delivering dedicated data, and the remaining dedicated physical control channel (DPCCH) is for delivering control information. The dedicated physical control channel (DPCCH) for transmitting control information is a pilot field (Pilot). ), A transport format combination indicator field (TFCI), a feedback information field (FBI), and a transmission power control field (TPC).

In particular, the pilot field N _pilot includes pilot bits (or symbols) for supporting channel estimation for coherent detection and pilot bits (or symbols) for frame synchronization.

In particular, it is very important to achieve frame synchronization using the pilot pattern of the pilot field (N _pilot ) at the reception side of the next generation mobile communication system.

Table 1 below shows frame synchronization words used for uplink and downlink dedicated physical channels (DPCH).

Frame Synchronization Words C ₁ = (1 0 0 0 1 1 1 1 0 1 0 1 1 0 0) C ₂ = (1 0 1 0 0 1 1 0 1 1 1 0 0 0 0) C ₃ = (1 1 0 0 0 1 0 0 1 1 0 1 0 1 1) C ₄ = (0 0 1 0 1 0 0 0 0 1 1 1 0 1 1) C ₅ = (1 1 1 0 1 0 1 1 0 0 1 0 0 0 1) C ₆ = (1 1 0 1 1 1 0 0 0 0 1 0 1 0 0) C ₇ = (1 0 0 1 1 0 1 0 1 1 1 1 0 0 0) C ₈ = (0 0 0 0 1 1 1 0 1 1 0 0 1 0 1)

The codes of Table 1 have an auto-correlation function characteristic as shown in Equation 1 below.

는 프레임 동기 워드 C_i의 자기상관함수이다.In Equation 1

Is the autocorrelation function of the frame sync word C _i .

In particular, the code of Table 1 is divided into four classes as shown in Equation 2 below.

When the codes of Table 1 are divided into four pairs as shown in Equation 2, the pilot bit sequence pairs belonging to each pair have a cross-correlation function characteristic as shown in Equations 3 and 4 below.

는 각 쌍들(E,F,G,H)의 파일럿 비트 시퀀스들 간 상호상관함수이다.Where i, j = 1,2, ...., 8

Is the cross-correlation function between pilot bit sequences of each pair (E, F, G, H).

As a result, a correlation result as shown in Equation 5 can be obtained by appropriate combination of frame sync words according to the autocorrelation function of Equation 1 above, and the code of each pair according to the cross-correlation function of Equation 3 and Equation 4 above is obtained. By appropriately combining with each other, the phase and the result as shown in Equation 6 can be obtained.

일 경우에 대한 자기상관결과를 나타낸 것이며, 도 1b는 상기한 식 6에서

일 경우에 동일한 쌍의 파일럿 비트 시퀀스들 간의 상호상관결과를 나타낸 것이다. 1A is represented by Equation 5

Figure 1b shows the autocorrelation result for case 1,

In one case, cross correlation results between pilot bit sequences of the same pair are shown.

일 경우에 대한 자기상관결과를 나타낸 것이며, 도 2b는 상기한 식 6에서

일 경우에 쌍들 E와 F에 해당되는 두 코드 쌍의 코드들 간의 상호상관결과를 나타낸 것이다. Also, Figure 2a is in the above formula 5

Autocorrelation result for the case is shown, Figure 2b is shown in Equation 6

In one case, the cross-correlation result between codes of two code pairs corresponding to pairs E and F is shown.

As an example, as shown in FIG. 2A, the autocorrelation function of the frame sync word shown in Table 1 represents the maximum correlation result at a delay time (τ = 0) of 0, except for this delay time (τ = 0). The minimum correlation is shown in the side delay (Sidelobe). Also, as can be seen from Figure 2b, the cross-correlation function for each pilot bit sequence of the same pair in the frame sync word shown in Table 1 is the result of maximum correlation of negative polarity at the intermediate delay point (τ = 7). It shows the minimum correlation result at the delay time except this intermediate delay point (tau = 7).

As a result, when a combination of the autocorrelation characteristics and the cross-correlation characteristics described above is used, double check is possible in frame synchronization confirmation.

In this manner, conventionally, frame synchronization is achieved by using the correlation characteristics of the frame sync words shown in Table 1, and frame synchronization is confirmed. However, this can work well if 15 slots are transmitted in one frame as in normal mode, and at least for one frame as in compressed mode, one of the features of W-CDMA. If 8 slots and 14 slots are transmitted, there is a problem in that the performance cannot be maximized.

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and an object of the present invention is to provide a frame sync word even when the W-CDMA mobile communication system operates in a compressed mode, i.e., when not all 15 slots are transmitted in one frame. The present invention provides a frame synchronization method in a mobile communication system capable of acquiring frame synchronization using a correlation characteristic of.

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인 상호 관계를 이용하여 상기 압축된 파일럿 비트 시퀀스들에서 상기 프레임 동기 워드들을 복구하고, 여기서 C_i,j는 파일럿 비트 시퀀스 C_i의 j번째 슬롯 비트이고, i=1, 3, 5, 7 그리고 j=0 ~ 14 이다.
또한 바람직하게, 상기 시퀀스들의 복구 단계는, 상기 쌍들의

인 상호 관계를 이용하여 상기 압축된 파일럿 비트 시퀀스들에서 상기 프레임 동기 워드들을 복구하고, 여기서 C_i+1,j는 파일럿 비트 시퀀스 C_i+1의 j번째 슬롯 비트이고, i=1, 3, 5, 7 그리고 j=0 ~ 14 이다.
본 발명의 다른 목적, 특징 및 이점들은 첨부한 도면을 참조한 실시 예들의 상세한 설명을 통해 명백해질 것이다.
이하, 첨부된 도면을 참조하여 본 발명에 따른 실시 예의 구성과 그 작용을 설명하며, 도면에 도시되고 또 이것에 의해서 설명되는 본 발명의 구성과 작용은 적어도 하나의 실시 예로서 설명되는 것이며, 이것에 의해서 상기한 본 발명의 기술적 사상과 그 핵심 구성 및 작용이 제한되지는 않는다.
이하, 본 발명에 따른 압축 모드로 동작하는 이동 통신 단말에서 파일럿 패턴을 이용한 프레임 동기 방법에 대한 바람직한 일 실시 예를 첨부된 도면을 참조하여 설명한다.Frame synchronization method in a mobile communication system according to the present invention for achieving the above object, receives a radio frame consisting of a plurality of pilot bit sequences are composed of frame synchronization words and are classified into a pair to have a mutual relationship is compressed Making a step; Recovering the compressed pilot bit sequences into frame sync words for frame sync using the correlation; And acquiring frame synchronization using the correlation characteristics of the recovered frame synchronization words.
More preferably, the recovering of the frame sync words comprises:

Is used to recover the frame sync words in the compressed pilot bit sequences, where C _{i, j} are the j th slot bits of the pilot bit sequence C _i , i = 1, 3, 5, 7 and j = 0 to 14.
Also preferably, the recovering of the sequences may include:

Is used to recover the frame sync words in the compressed pilot bit sequences, where C _{i + 1, j} is the j th slot bit of the pilot bit sequence C _{i + 1} , i = 1, 3, 5, 7 and j = 0 to 14.
Other objects, features and advantages of the present invention will become apparent from the detailed description of the embodiments with reference to the accompanying drawings.
Hereinafter, with reference to the accompanying drawings illustrating the configuration and operation of the embodiment according to the present invention, the configuration and operation of the present invention shown in the drawings and described by it will be described by at least one embodiment, this By the technical spirit of the present invention described above and its core configuration and operation is not limited.
Hereinafter, a preferred embodiment of a frame synchronization method using a pilot pattern in a mobile communication terminal operating in a compression mode according to the present invention will be described with reference to the accompanying drawings.

In the present invention, a pilot pattern used for an uplink dedicated physical channel (Uplink DPCH) and a downlink dedicated physical channel (Downlink DPCH) will be described. However, the technical idea of the present invention can be applied to all channels using a pilot pattern in uplink and downlink.

3 is a diagram illustrating a structure of an uplink dedicated physical channel (DPCH) according to a 3GPP radio access network (RAN) standard.

The following Table 2 shows each field information of the uplink dedicated physical data channel (DPDCH), and the following Table 3 shows each field information of the uplink dedicated physical control channel (DPCCH).

Slot Format #i Channel bit rate (kbps) Channel symbol rate (ksps) Diffusion factor (SF) Bits per frame Bits per slot N _data 0 15 15 256 150 10 10 One 30 30 128 300 20 20 2 60 60 64 600 40 40 3 120 120 32 1200 80 80 4 240 240 16 2400 160 160 5 480 480 8 4800 320 320 6 960 960 4 9600 640 640

Slot Format #i Channel bit rate (kbps) Channel symbol rate (ksps) diffusion factor (SF) Per frame Number of bits Per slot Number of bits N _pilot N _TPC N _TFCI N _FBI Transmission slots per frame 0 15 15 256 150 10 6 2 2 0 15 0A 15 15 256 150 10 5 2 3 0 10-14 0B 15 15 256 150 10 4 2 4 0 8-9 One 15 15 256 150 10 8 2 0 0 8-15 2 15 15 256 150 10 5 2 2 One 15 2A 15 15 256 150 10 4 2 3 One 10-14 2B 15 15 256 150 10 3 2 4 One 8-9 3 15 15 256 150 10 7 2 0 One 8-15 4 15 15 256 150 10 6 2 0 2 8-15 5 15 15 256 150 10 5 One 2 2 15 5A 15 15 256 150 10 4 One 3 2 10-14 5B 15 15 256 150 10 3 One 4 2 8-9

As shown in Table 3 above, in the compression mode, the slot format of the dedicated physical control channel (DPCCH) having the transport format combining indicator field (TFCI) is changed. That is, in the compression mode, as shown in Table 3, there are two more modes in which separate indices A and B are added. For example, slot format # 2 is field information corresponding to a normal mode, and slot format # 2A and slot format # 2B are field information corresponding to a compression mode.

As can be seen from Table 3, in the normal mode, the number of slots transmitted per frame is 15 slots. In the compressed mode, the number of slots transmitted per frame is at least 8 slots. In other words, at least 8 slots of information are transmitted even in the compressed mode.

Table 4 below shows pilot bit patterns of an uplink dedicated physical control channel (DPCCH) applied to the present invention, wherein pilot bits (N _pilot ) constituting one slot are 3, 4, 5, and 6 bits. Indicated. In addition, Table 5 shows the pilot bit pattern of the uplink dedicated physical control channel (DPCCH) when the pilot bits (N _pilot ) constituting one slot are 7 bits and 8 bits.

In the pilot patterns of Tables 4 and 5, the shaded portion of all pilot bits is used for frame synchronization, and the pilot bits of other portions except this have a value of "1". A column sequence with all "1" bit values is used for channel estimation for coherent detection.

A column sequence of length 15 shaded in Tables 4 and 5 above is each frame sync word of Table 1 previously described, and these column sequences are used for frame synchronization.

In addition, the mapping relationship between the column sequence for frame synchronization of Table 4 and Table 5 and the frame synchronization word of Table 1 is shown in Table 6 below.

N _pilot Pilot bit position 15-bit length sequence of pilot patterns 3 0 C1 One C2 4 One C1 2 C2 5 0 C1 One C2 3 C3 4 C4 6 One C1 2 C2 4 C3 5 C4 7 One C1 2 C2 4 C3 5 C4 8 One C1 3 C2 5 C3 7 C4

Looking at the interrelationships of the above codes C ₁ , C ₂ , C ₃ , C ₄ , these pilot bit sequences form a pilot bit sequence pair as pairs E and F as already described above.

In particular, when N _pilot = 3 of the uplink dedicated physical channel (DPCH), the relationship between C ₁ and C ₂ according to bit # can be known as shown in Table 7 below.

In Table 7, C _{i and j} represent the j th slot bits of the pilot bit pattern C _i .

In addition, when N _pilot = 6 of the uplink dedicated physical channel (DPCH), as shown in Table 8, the relationship between C ₁ and C ₂ , C ₃ and C ₄ according to bit # can be known.

In this case, in Table 8, C _{i and j} represent the j th slot bits of the pilot bit pattern (or sequence) C _i .

In the present invention, the slot information that is not transmitted in the compression mode can be known by using each relationship of the pilot bit pattern, and in particular, the pilot bit pattern for each frame can be recovered.

Four pilot bit sequences used in the uplink pilot bit pattern are first divided into pairs E and F as follows.

E = {C ₁ , C ₂ }, F = {C ₃ , C ₄ }

As shown in Tables 7 and 8, the two pilot bit sequences belonging to each pair have a relationship as shown in Equations 7 and 8.

In said Formula 7 and Formula 8, i = 1,3 and it is an integer of j = 0-14.

Accordingly, when the uplink dedicated physical control channel (DPCCH) is transmitted over eight slots in the compressed mode, the number of untransmitted information bits shown in the following Equation 9 in the pilot bit pattern C ₁ is represented by the equation of Equation 7 above. Use to recover.

In a similar manner, untransmitted information bits in the pilot bit pattern C ₂ are recovered using the relational expression of Equation 8 described above.

개의 정보 비트가 전송되지 않은 파일럿 비트 패턴 C₃의 전송되지 않은 정보 비트는 식 7에 의해 복구되며, 파일럿 비트 패턴 C₄의 전송되지 않은 정보 비트는 식 8에 의해 복구된다. As a result, not only the untransmitted information bits of the pilot bit patterns of the pair E are recovered, but also the information bits not transmitted in the compressed mode among all the pilot bit patterns of the pair F also use the relations of Equations 7 and 8 described above. Is recovered. for example,

Untransmitted information bits of pilot bit pattern C ₃ for which no information bits have been transmitted are recovered by equation 7, and untransmitted information bits of pilot bit pattern C ₄ are recovered by equation 8.

This is possible because there is a complementary relationship between two pilot bit sequences of the same pair.

4 is a diagram illustrating a structure of a downlink dedicated physical channel (DPCH) according to a 3GPP radio access network (RAN) standard. In FIG. 4, the parameter k represents the total number of bits of one slot in the downlink dedicated physical channel (DPCH). This parameter k is related to the spreading factor (SF), and the spreading factor (SF) is 512 / ^2k , and the spreading factor is determined to be 4 to 512.

Table 9 below shows some field information of a downlink dedicated physical control channel (DPCCH).

Basically, the downlink dedicated physical channel (DPCH) is divided into two cases, one having a transport format combining indicator field (TFCI) and one having no transport format combining indicator field (TFCI).

In particular, as shown in Table 9, the compression mode uses a slot format different from the normal mode. That is, in the compression mode, there are two more modes in which separate indices A and B are added as shown in Table 9. Here, the type A slot format is used as a transmission time reduction method, and the type B slot format is used as a spreading factor reduction method.

For example, slot format # 3 is field information corresponding to a normal mode, and slot format # 3A and slot format # 3B are field information corresponding to a compression mode.

As can be seen from Table 9, the number of slots transmitted per frame is 15 slots in the normal mode, and the number of slots transmitted per frame is at least 8 slots in the compressed mode. In other words, at least 8 slots of information are transmitted even in the compressed mode.

When the B-type slot format is used as a spreading factor reduction method in downlink compression mode, the number of bits of the TPC and the number of pilot fields are transmitted twice. do. In this case, symbol repetition is used. For example, if the bits of these two fields are denoted as x ₁ , x ₂ , x ₃ , ..., x _x in normal mode, then the bits of these two fields are _x in compressed mode. _It is repeatedly transmitted in the order of ₁ , x ₂ , x ₁ , x ₂ , x ₃ , x ₄ , x ₃ , x ₄ , ..., x _x , x _x .

The following Table 10 shows pilot symbol patterns of a downlink dedicated physical control channel (DPCCH) applied to the present invention, wherein pilot symbols (N _pilot ) constituting one slot are 2, 4, 8, and 16 bits. Indicated.

In the pilot pattern of Table 10, a shaded portion of all pilot symbols is used for frame synchronization, and pilot symbols of other portions except this have a value of "1". A column sequence all having a symbol value of "1" is used for channel estimation for coherent detection.

In addition, the mapping relationship between the column sequence for frame synchronization of Table 10 and the frame synchronization word of Table 1 is shown in Table 11 below.

Symbol rate symbol # channel 15-bit length sequence of pilot patterns N _pilot = 2 0 I-CH C1 Q-CH C2 N _pilot = 4 One I-CH C1 Q-CH C2 N _pilot = 8 One I-CH C1 Q-CH C2 3 I-CH C3 Q-CH C4 N _pilot = 16 One I-CH C1 Q-CH C2 3 I-CH C3 Q-CH C4 5 I-CH C5 Q-CH C6 7 I-CH C7 Q-CH C8

In particular, when N _pilot = 8 of the downlink dedicated physical channel (DPCH), as shown in Table 12, the relationship between C ₁ and C ₂ according to symbol #, and the relationship between C ₃ and C ₄ can be seen. .

In Table 12, C _{i, j} represents the j-th slot symbol of the pilot symbol pattern C _i .

In the present invention, slot information that is not transmitted in the compression mode can be known by using each code relationship of the downlink pilot symbol pattern, and in particular, a pilot symbol pattern (or bit sequence) in units of frames for frame synchronization can be recovered. .

The eight codes used in the downlink pilot symbol pattern are first divided into pair E, pair F, pair G, and pair H as follows.

E = {C ₁ , C ₂ }, F = {C ₃ , C ₄ }, G = {C ₅ , C ₆ }, H = {C ₇ , C ₈ }

As shown in Table 12, the two pilot bit sequences belonging to each pair have the same relationship as Equations 7 and 8 described above.

However, in the case of downlink, i = 1,3,5,7 in Equation 7 and Equation 8 and j = 0-14.

Accordingly, when the downlink dedicated physical control channel (DPCCH) is transmitted over eight slots in the compressed mode, the number of untransmitted information bits shown in Equation 9 in the pilot symbol pattern C ₁ is expressed by the equation in Equation 7. To recover. In addition, information bits that are not transmitted in the pilot bit pattern (or sequence) C ₂ are recovered using the relational expression of Equation 8.

개의 정보 비트가 전송되지 않은 파일럿 비트 패턴 C₁,C₃,C₅,C₇의 전송되지 않은 정보 비트는 식 7에 의해 복구되며, 파일럿 비트 패턴 C₂,C₄,C₆,C₈의 전송되지 않은 정보 비트는 식 8에 의해 복구된다. As a result, not only the untransmitted information bits of the pilot bit patterns of the pair E are recovered, but also the information bits not transmitted in the compressed mode among all the pilot bit patterns of each pair F, pair G, and pair H are also described above. And the relationship of equation (8). for example,

Untransmitted information bits of the pilot bit patterns C ₁ , C ₃ , C ₅ , and C ₇ that have not been transmitted are recovered by Equation 7, and the pilot bit patterns C ₂ , C ₄ , C ₆ , and C ₈ Untransmitted information bits are recovered by equation (8).

This is possible because there is a complementary relationship between two pilot bit sequences of the same pair.

Table 13 shows pilot symbol patterns considering construction time diversity (hereinafter, abbreviated as STTD) for the pilot symbol patterns shown in Table 10.

The pilot symbol pattern of Table 13 is a pilot pattern generated by STTD encoding, and FIG. 5 shows the STTD encoding principle.

In addition, the mapping relationship between the column sequence for frame synchronization of Table 13 and the frame synchronization word of Table 1 is shown in Table 14 below.

Symbol rate symbol # channel 15-bit length sequence of pilot patterns N _pilot = 2 0 I-CH -C1 Q-CH C2 N _pilot = 4 0 I-CH -C1 Q-CH C2 N _pilot = 8 One I-CH -C3 Q-CH C4 3 I-CH C1 Q-CH -C2 N _pilot = 16 One I-CH -C3 Q-CH C4 3 I-CH C1 Q-CH -C2 5 I-CH -C7 Q-CH C8 7 I-CH C5 Q-CH -C6

After the STTD encoded information is STTD decoded, slot information that is not transmitted by the pilot symbol pattern recovery procedure described above is recovered.

The recovery procedure described so far may be represented by a device configuration as shown in FIG.

6 is a diagram illustrating an apparatus configuration for recovering a pilot pattern used for frame synchronization of the present invention in a compression mode.

In compressed mode, at least eight slots are transmitted, so up to seven slots are punctured in one frame. The functions for the frame sync word before puncturing and the functions for the punctured frame sync word are expressed as in Equation 10 below.

C ₁ (t), C ₂ (t), C ₃ (t), ..., C ₈ (t)

C ₁ (t) P (t), C ₂ (t) P (t), C ₃ (t) P (t), ..., C ₈ (t) P (t)

The frame punctured and transmitted in the compression mode is expressed as shown in Equation 11 after the noise component is added.

Thereafter, the received frame sync word shown in Equation 12 is recovered by the pilot symbol pattern recovery procedure according to the above-described relation, and the recovered frame sync word is applied to the correlator of FIGS. 7 and 8 to apply the frame sync procedure. Perform

7 is a diagram illustrating a configuration of a self-correlator for frame synchronization according to the present invention, and FIG. 8 is a diagram illustrating a configuration of a cross-correlator for frame synchronization according to the present invention. In these correlators of Figs. 7 and 8, T _frame represents one frame time, which is 10 msec in the current 3GPP standard.

When the frame sync word is recovered by the above recovery procedure, the recovered frame sync word is input to the self-correlator of FIG. 7 or the cross-correlator of FIG.

As a result, the present invention achieves frame synchronization with respect to uplink and downlink dedicated physical channels (DPCH) using the same method and apparatus as in the normal mode, and also confirms frame synchronization. In addition, out-of synchronization detection is also realized.

After comparing the correlator output over the frame time determined by the network through the upper layer with a specific threshold, the receiving side reports to the upper layer whether the frame synchronization check succeeded or failed.

As described above, in the present invention, even when the W-CDMA mobile communication system operates in the compression mode and not all 15 slots are transmitted in one frame, the full frame sync word of each frame is recovered by using the characteristic of the dedicated pilot pattern. can do. Since the correlation characteristics of the recovered frame sync words can be used even in the compressed mode, frame synchronization can be achieved using the same procedures and devices as in the normal mode. In addition, frame synchronization confirmation and synchronization failure detection are facilitated even in the compression mode.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims.

Claims (20)

Receiving a radio frame including a plurality of pilot bit sequences compressed in a pair of frame sync words and classified into pairs to have a mutual relationship; Recovering the compressed pilot bit sequences into frame sync words for frame sync using the correlation; And obtaining frame synchronization using the correlation characteristics of the recovered frame synchronization words. The method of claim 1, wherein the recovering of the frame sync words comprises:

Is used to recover the frame sync words in the compressed pilot bit sequences, where C _{i, j} are the j th slot bits of the pilot bit sequence C _i , i = 1, 3, 5, 7 and Frame j synchronization method in a mobile communication system, characterized in that j = 0 ~ 14. The method of claim 1, wherein the recovering of the sequences comprises:

Is used to recover the frame sync words in the compressed pilot bit sequences, where C _{i + 1, j} is the j th slot bit of the pilot bit sequence C _{i + 1} , i = 1, 3, 5, 7 and j = 0 to 14, the frame synchronization method in a mobile communication system. The method of claim 1, wherein the frame sync words are: A frame synchronization method in a mobile communication system, characterized in that punctured for the desired number of slots in transmission at the base station. 5. The method of claim 4, wherein the frame sync words are punctured up to 7 bits. The method of claim 1, wherein the acquiring the frame synchronization comprises: Classifying the recovered frame sync words into a plurality of pairs; And Obtaining the frame synchronization using at least one cross-correlation function of each pair of recovered frame synchronization words.  7. The method of claim 6, wherein if the frame sync words are eight and four pairs are classified as E = C1, C2, F = C3, C4, G = C5, C6 and H = C7, C8, then each pair is correlated Functions

Frame synchronization method in a mobile communication system, characterized in that. The method of claim 1, wherein the acquiring the frame synchronization comprises: Classifying the recovered frame sync words into a plurality of pairs; And Obtaining the frame synchronization using at least one autocorrelation function of each pair of recovered frame synchronization words.  9. The method of claim 8, wherein if the frame sync words are eight and four pairs are classified as E = C1, C2, F = C3, C4, G = C5, C6, H = C7, C8, then each pair is autocorrelated function

Frame synchronization method in a mobile communication system, characterized in that. The method of claim 1, wherein the acquiring the frame synchronization comprises: And at least one of an autocorrelation function and a cross-correlation function according to the mutual relationship of the recovered frame synchronization words. Generating compressed pilot bit sequences by excluding some of the frame sync words corresponding to a plurality of pilot bit sequences classified into pairs to have a mutual relationship; And And transmitting the compressed pilot bit sequences to a receiving side. 12. The method of claim 11, wherein the pair of pilot bit sequences

, Where C _{i, j} is the j th slot bit of the pilot bit sequence C _i , i = 1, 3, 5, 7 and j = 0-14 How to support the mode. 12. The method of claim 11, wherein the pair of pilot bit sequences

And recover the frame sync words in the compressed pilot bit sequences, where C _{i + 1, j} is the j th slot bit of the pilot bit sequence C _{i + 1} , i = 1, 3, 5, 7 and j = 0 to 14, characterized in that the compression mode support method in a mobile communication system. 12. The method of claim 11, wherein the compressed pilot sequences are generated by puncturing for a desired number of slots. 15. The method of claim 14, wherein the compressed pilot sequences are punctured up to 7 bits. 12. The method of claim 11, wherein each of the pairs of corresponding frame sync words is recovered using the correlation of the compressed pilot bit sequences and the frame synchronization is performed using at least one cross correlation function of the recovered frame sync words. Further comprising: obtaining a compression mode support method in a mobile communication system. 17. The method of claim 16, wherein if the frame sync words are eight and are classified as four pairs E = C1, C2, F = C3, C4, G = C5, C6 and H = C7, C8, each pair is correlated Functions

Compression mode support method in a mobile communication system, characterized in that can be represented as. 12. The apparatus of claim 11, wherein each of the pairs of corresponding frame sync words is recovered using the interrelationships of the compressed pilot bit sequences and the frame sync is performed using at least one autocorrelation function of the recovered frame sync words. Further comprising: obtaining a compression mode support method in a mobile communication system.  19. The apparatus of claim 18, wherein if the frame sync words are eight and are classified as four pairs E = C1, C2, F = C3, C4, G = C5, C6, H = C7, C8, each pair is autocorrelated function

Compression mode support method in a mobile communication system, characterized in that can be represented as. 12. The method of claim 11, wherein each of the pairs of frame synchronization words is recovered using the correlation of the compressed pilot bit sequences, and among the autocorrelation function and cross correlation function according to the correlation of the recovered frame synchronization words. The method of claim 1, further comprising: frame synchronization using at least one or more.

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