KR20110070683A - Method for partitioning cell identitis according to cell type in wireless communication system and apparatus therefor - Google Patents

Abstract

PURPOSE: A method for partitioning cell identifiers according to a cell type in a wireless communication system and an apparatus therefor are provided to detect a cell identifier more effectively in the IEEE 802.16m wireless communication system. CONSTITUTION: SA-preamble sequences are sectioned to a SA-preamble sequence for a public ABS(Advanced Base Station) and a private ABS(800). Provided is information about whether all AMS(Advanced Mobile Stations) can access a target ABS according to the partitioning. According to the kind of the public ABS, SA-preamble sequence partitioning for the public ABS is partitioned more minutely(850). According to the kind of the private ABS, SA-preamble sequence partitioning for the private ABS is partitioned more minutely.

Description

Method for partitioning cell identifiers according to cell types in wireless communication system and apparatus therefor {METHOD FOR PARTITIONING CELL IDENTITIS ACCORDING TO CELL TYPE IN WIRELESS COMMUNICATION SYSTEM AND APPARATUS THEREFOR}

The present invention relates to a wireless communication system. In particular, the present invention relates to a method and apparatus for partitioning cell identifiers according to cell types in a wireless communication system.

1 illustrates a wireless communication system. Referring to FIG. 1, the wireless communication system 100 includes a plurality of base stations 110 and a plurality of terminals 120. The wireless communication system 100 may include a homogeneous network or a heterogeneous network. Here, the heterogeneous network refers to a network in which different network entities coexist such as a macro cell, a femto cell, a pico cell, a repeater, and the like. A base station is generally a fixed station that communicates with a terminal, and each base station 110a, 110b, and 110c provides services to specific geographic regions 102a, 102b, and 102c. In order to improve system performance, the particular area may be divided into a plurality of smaller areas 104a, 104b and 104c. Each smaller area may be referred to as a cell, sector or segment. In the case of the Institute of Electrical and Electronics Engineers (IEEE) 802.16 system, a cell identifier is assigned based on the entire system. On the other hand, the sector or segment identifier is given based on a specific area where each base station provides a service and has a value of 0 to 2. The terminal 120 is generally distributed in a wireless communication system and can be fixed or mobile. Each terminal may communicate with one or more base stations via uplink and downlink at any moment. The base station and the terminal are frequency division multiple access (FDMA), time division multiple access (TDMA), code division multiple access (CDMA), single carrier-FDMA (SC-FDMA), multi carrier-FDMA (MC-FDMA), and OFDMA ( Communication may be performed using Orthogonal Frequency Division Multiple Access) or a combination thereof. In the present specification, uplink refers to a communication link from a terminal to a base station, and downlink refers to a communication link from a base station to a terminal.

The present invention provides a method and apparatus for partitioning cell identifiers according to cell types in a wireless communication system.

Technical problems to be achieved in the present invention are not limited to the above-mentioned technical problems, and other technical problems not mentioned above will be clearly understood by those skilled in the art from the following description. Could be.

In a wireless communication system according to an aspect of the present invention, a method for transmitting a cell type information by a base station may include boundary point information between a cell identifier of a public ABS and a cell identifier of a private ABS. (Z) broadcasting through S-SFH Second-Super Frame Header SubPacket (S3), wherein the boundary point information (Z) is partitioned into 10 or 20 sequence granularities per segment. The range information of the total 16 cell identifier partitions is obtained, and the range information of the cell identifier partition includes information that all cell identifiers are cell identifiers for a dedicated ABS or that all cell identifiers except macro ABS are cell identifiers for a common ABS. Characterized in that it comprises a. Preferably, the dedicated ABS is characterized in that the Closed Subscriber Group (CSG) femto ABS.

The boundary point information Z includes 86 cell identifiers for macro ABS per segment, and 256 * segment IDs to 85 + 256 * segment IDs are cell identifiers for macro ABS in common ABS, and 86 + 256 * segment IDs. To Z + 256 * segment ID indicates a cell identifier for common ABS excluding macro ABS, and from (Z + 1) + 256 * segment ID to 255 + 256 * segment ID indicates a cell identifier for CSG femto ABS. In this case, the segment ID is preferably an integer of 0 to 2.

The boundary point information (Z) has a size of 4 bits and is broadcast through the SA-Preamble sequence soft partitioning information field of the S-SFH SP3.

In addition, the common ABS includes a macro ABS, a macro hot-zone ABS, a relay ABS and an Open Subscriber Group (OSG) femto ABS, and the dedicated ABS includes a CSG-close ABS and a CSG-open ABS.

According to another aspect of the present invention, a base station apparatus includes a processor configured to set boundary information Z of a cell identifier of a public ABS and a cell identifier of a private ABS; And a transmission module for broadcasting the boundary point information (Z) through S-SFH Secondary-Super Frame Header SubPacket (S-SFH SP3), wherein the boundary point information (Z) is 10 or 20 sequence granularities per segment. Range information of a total of 16 cell identifier partitions partitioned by), wherein the range information of the cell identifier partition includes information that all cell identifiers are cell identifiers for a dedicated ABS or that all cell identifiers except macro ABSs share a common ABS. Characterized as a cell identifier for characterized in that it comprises. Preferably, the dedicated ABS is characterized in that the Closed Subscriber Group (CSG) femto ABS.

The boundary point information Z includes 86 cell identifiers for macro ABS per segment, and 256 * segment IDs to 85 + 256 * segment IDs are cell identifiers for macro ABS in common ABS, and 86 + 256 * segment IDs. To Z + 256 * segment ID indicates a cell identifier for common ABS excluding macro ABS, and from (Z + 1) + 256 * segment ID to 255 + 256 * segment ID indicates a cell identifier for CSG femto ABS. In this case, the segment ID is preferably an integer of 0 to 2.

The boundary point information (Z) has a size of 4 bits and is broadcast through the SA-Preamble sequence soft partitioning information field of the S-SFH SP3.

In another aspect of the present invention, a method of receiving, by a terminal, cell type information in a wireless communication system includes: receiving a secondary-super frame header subpacket (S-SFH SP3) from a base station; And obtaining boundary point information (Z) of a cell identifier of a public ABS and a cell identifier of a private ABS from the S-SFH SP3, wherein the boundary point information ( Z) is range information of a total of 16 cell identifier partitions partitioned into 10 or 20 sequence granularities per segment, wherein the range information of the cell identifier partitions is for all ABSs dedicated to dedicated ABS. The information on the cell identifier or all cell identifiers except the macro ABS include the information on the cell identifier for the common ABS. Preferably, the dedicated ABS is characterized in that the Closed Subscriber Group (CSG) femto ABS.

The boundary point information Z includes 86 cell identifiers for macro ABS per segment, and 256 * segment IDs to 85 + 256 * segment IDs are cell identifiers for macro ABS in common ABS, and 86 + 256 * segment IDs. To Z + 256 * segment ID indicates a cell identifier for common ABS excluding macro ABS, and from (Z + 1) + 256 * segment ID to 255 + 256 * segment ID indicates a cell identifier for CSG femto ABS. In this case, the segment ID is preferably an integer of 0 to 2.

The boundary point information (Z) has a size of 4 bits and is received through the SA-Preamble sequence soft partitioning information field of the S-SFH SP3.

In addition, the common ABS includes a macro ABS, a macro hot-zone ABS, a relay ABS and an Open Subscriber Group (OSG) femto ABS, and the dedicated ABS includes a CSG-close ABS and a CSG-open ABS.

In another aspect of the present invention, a terminal apparatus in a wireless communication system includes: a receiving module for receiving a secondary-super frame header subpacket (S-SFH SP3); And a processor for obtaining boundary point information (Z) of a cell identifier of a public ABS and a cell identifier of a private ABS from the S-SFH SP3. (Z) is range information of a total of 16 cell identifier partitions partitioned into 10 or 20 sequence granularities per segment, and the range information of the cell identifier partitions indicates that all cell identifiers have a dedicated ABS. It is characterized in that all the cell identifiers except for the cell identifier for information or macro ABS include information for the cell identifier for the common ABS. Preferably, the dedicated ABS is characterized in that the Closed Subscriber Group (CSG) femto ABS.

The boundary point information Z includes 86 cell identifiers for macro ABS per segment, and 256 * segment IDs to 85 + 256 * segment IDs are cell identifiers for macro ABS in common ABS, and 86 + 256 * segment IDs. To Z + 256 * segment ID indicates a cell identifier for common ABS excluding macro ABS, and from (Z + 1) + 256 * segment ID to 255 + 256 * segment ID indicates a cell identifier for CSG femto ABS. In this case, the segment ID is preferably an integer of 0 to 2.

The boundary point information (Z) has a size of 4 bits and is received through the SA-Preamble sequence soft partitioning information field of the S-SFH SP3.

In addition, the common ABS includes a macro ABS, a macro hot-zone ABS, a relay ABS and an Open Subscriber Group (OSG) femto ABS, and the dedicated ABS includes a CSG-close ABS and a CSG-open ABS.

According to embodiments of the present invention, it is possible to detect the cell identifier more effectively in the IEEE 802.16m wireless communication system. In addition, the cell identifiers may be efficiently partitioned according to the cell type, and the overhead of the terminal may be reduced.

The effects obtainable in the present invention are not limited to the above-mentioned effects, and other effects not mentioned above may be clearly understood by those skilled in the art from the following description. will be.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included as part of the detailed description in order to provide a thorough understanding of the present invention, provide an embodiment of the present invention and together with the description, illustrate the technical idea of the present invention.
1 illustrates a wireless communication system.
2 illustrates a block diagram of a transmitter and a receiver for OFDMA and SC-FDMA.
3 illustrates a radio frame structure of an IEEE 802.16m system.
4 shows an example of transmitting a synchronization channel in an IEEE 802.16m system.
5 shows a subcarrier to which a PA-preamble is mapped in the IEEE 802.16m system.
6 shows an example of mapping a SA-preamble to a frequency domain in an IEEE 802.16m system.
7 illustrates an SA-preamble structure in the frequency domain for 512-FFT in the IEEE 802.16m system.
8 illustrates an SA-preamble sequence partitioning technique according to an embodiment of the present invention.
9 illustrates a block diagram of a transmitter and a receiver according to an embodiment of the present invention.

The construction, operation and other features of the present invention will be readily understood by the preferred embodiments of the present invention described with reference to the accompanying drawings. The embodiments described below are examples in which the technical features of the present invention are applied to a system using a plurality of orthogonal subcarriers. For convenience, the present invention is described using an IEEE 802.16 system, but this is exemplified, and the present invention can be applied to various wireless communication systems including a 3rd Generation Partnership Project (3GPP) system.

2 illustrates a block diagram of a transmitter and a receiver for OFDMA and SC-FDMA. In uplink, a transmitter may be part of a terminal and a receiver may be part of a base station. In downlink, a transmitter may be part of a base station and a receiver may be part of a terminal.

Referring to FIG. 2, an OFDMA transmitter includes a serial to parallel converter 202, a sub-carrier mapping module 206, and an M-point Inverse Discrete Fourier Transform (IDFT) module. 208, a cyclic prefix (CP) addition module 210, a parallel to serial converter (212), and a Radio Frequency (RF) / Digital to Analog Converter (DAC) module 214. .

Signal processing in the OFDMA transmitter is as follows. First, a bit stream is modulated into a data symbol sequence. The bit stream may be obtained by performing various signal processing such as channel encoding, interleaving, scrambling, etc. on the data block received from the medium access control (MAC) layer. The bit stream is sometimes referred to as a codeword and is equivalent to a block of data received from the MAC layer. The data block received from the MAC layer is also called a transport block. The modulation scheme may include, but is not limited to, Binary Phase Shift Keying (BPSK), Quadrature Phase Shift Keying (QPSK), and Quadrature Amplitude Modulation (n-QAM). Thereafter, the serial data symbol sequences are converted N by N in parallel (202). The N data symbols are mapped to the allocated N subcarriers among the total M subcarriers, and the remaining M-N carriers are padded with zeros (206). Data symbols mapped to the frequency domain are converted to time domain sequences through M-point IDFT processing (208). Thereafter, in order to reduce intersymbol interference and intercarrier interference, an OFDMA symbol is generated by adding a cyclic prefix to the time-domain sequence. The generated OFDMA symbols are converted 212 in parallel to serial. Thereafter, the OFDMA symbol is transmitted to the receiver through the process of digital-to-analog conversion, frequency upconversion, etc. (214). The other user is allocated available subcarriers among the remaining M-N subcarriers. On the other hand, the OFDMA receiver includes an RF / ADC (Analog to Digital Converter) module 216, a serial / parallel converter 218, a remove CP module 220, and an M-point Discrete Fourier Transform (DFT) module ( 224, subcarrier demapping / equalization module 226, parallel / serial converter 228, and detection module 230. The signal processing of the OFDMA receiver consists of the inverse of the OFDMA transmitter.

Meanwhile, the SC-FDMA transmitter further includes an N-point DFT module 204 before the subcarrier mapping module 206 as compared to the OFDMA transmitter. SC-FDMA transmitter can significantly reduce the peak-to-average power ratio (PAPR) of the transmission signal compared to the OFDMA scheme by spreading a plurality of data in the frequency domain through the DFT prior to IDFT processing. The SC-FDMA receiver further includes an N-point IDFT module 228 after the subcarrier demapping module 226 as compared to the OFDMA receiver. The signal processing of the SC-FDMA receiver consists of the inverse of the SC-FDMA transmitter.

The module illustrated in FIG. 2 is for illustrative purposes, and the transmitter and / or receiver may further include necessary modules, some modules / functions may be omitted, or may be separated into different modules, and two or more modules may be one module. It can be integrated into.

3 illustrates a radio frame structure of the IEEE 802.16m system.

Referring to FIG. 3, the radio frame structure includes a 20 ms superframe SU0-SU3 supporting a 5 MHz, 8.75 MHz, 10 MHz or 20 MHz bandwidth. The superframe includes four 5ms frames (F0-F3) having the same size and starts with a Superframe Header (SFH). The superframe header carries essential system parameters and system configuration information.

The frame includes eight subframes SF0-SF7. Subframes are allocated for downlink or uplink transmission. The subframe includes a plurality of OFDM symbols in the time domain and includes a plurality of subcarriers in the frequency domain. The OFDM symbol may be called an OFDMA symbol, an SC-FDMA symbol, or the like according to a multiple access scheme. The number of OFDM symbols included in the subframe may be variously changed according to the channel bandwidth and the length of the cyclic prefix.

The OFDM symbol includes a plurality of subcarriers, and the number of subcarriers is determined according to the fast fourier transform (FFT) size. The types of subcarriers may be divided into data subcarriers for data transmission, pilot subcarriers for channel measurement, null subcarriers for guard bands, and DC components. Parameters that characterize an OFDM symbol are BW, N _used , n, G, and the like. BW is the nominal channel bandwidth. N _used is the number of subcarriers _used for signal transmission. n is a sampling factor and, together with BW and N _used , determines subcarrier spacing and useful symbol time. G is the ratio of CP time to useful time.

Table 1 shows an example of OFDMA parameters.

4 shows an example of transmitting a synchronization channel in an IEEE 802.16m system. This embodiment assumes an IEEE 802.16m only mode.

Referring to FIG. 4, four synchronization channels (SCH) are transmitted in one superframe SU1 to SU4 in the IEEE 802.16m system. In the IEEE 802.16m system, the downlink synchronization channel includes a main synchronization channel and a floating channel, each of which consists of a primary advanced preamble (PA-preamble) and a secondary advanced preamble (SA-preamble). In the FDD mode and the TDD mode, the downlink synchronization channel may be transmitted through the first OFDMA symbol of the frame.

The PA-preamble is typically used to obtain some information such as system frequency bandwidth and carrier configuration information. The SA-preamble is usually used to acquire a cell identifier, and may also be used for a purpose of measuring Received Signal Strength Indication (RSSI). The PA-preamble may be transmitted on the first frame (FO), and the SA-preamble may be transmitted on the second to fourth frames (FO1-FO3).

5 shows a subcarrier to which a PA-preamble is mapped in the IEEE 802.16m system.

Referring to FIG. 5, the length of the PA-preamble is 216 and is independent of the FFT size. The PA preamble is inserted at intervals of two subcarriers and zero is inserted in the remaining intervals. For example, the PA-preamble may be inserted into subcarriers 41, 43, ..., 469, and 471. The PA-preamble may carry system bandwidth information and carrier configuration information. When subcarrier index 256 is reserved for DC, the subcarrier to which the sequence is mapped may be determined using Equation 1.

Here, k represents the integer of 0-215.

For example, a QPSK type sequence of length 216 shown in Table 1 may be used for the PA-preamble.

6 shows an example of mapping a SA-preamble to a frequency domain in an IEEE 802.16m system.

Referring to FIG. 6, the number of subcarriers allocated to the SA-preamble may vary depending on the FFT size. For example, the length of the SA-preamble may be 144, 288, and 576 for 512-FFT, 1024-FFT, and 2048-FFT, respectively. When 256, 512, and 1024 subcarriers are reserved as DC components for 512-FFT, 1024-FFT, and 2048-FFT, respectively, the subcarriers allocated to the SA-preamble may be determined according to Equation 2.

Here, n is a SA-preamble carrier set index and has a value of 0, 1 or 2 and indicates a segment ID. N _SAP represents the number of subcarriers allocated to the SA-preamble, and k represents an integer of 0 to N _SAP -1.

Each cell has a cell identifier (IDCell) represented by an integer from 0 to 767. The cell identifier is defined as a segment index and an index given for each segment. In general, the cell identifier may be determined by Equation 3.

Here, n is a SA-preamble carrier set index and has a value of 0, 1 or 2 and indicates a segment ID. Idx represents an integer of 0 to 255 and is determined by Equation 4 below.

Where q is an SA-preamble sequence index and is an integer from 0 to 255.

For 512-FFT, the 288 bit SA-preamble is divided into eight subblocks (ie, A, B, C, D, E, F, G and H), and each subblock is 36 bits long. Each segment ID has a different sequence subblock.

The 802.16m system defined SA-preamble will be illustrated in detail later. In the case of the 512-FFT, A, B, C, D, E, F, G and H are sequentially modulated and then mapped to the SA-preamble subcarrier set corresponding to the segment ID. When the FFT size becomes large, the basic blocks A, B, C, D, E, F, G, H are repeated in the same order. For example, in the case of a 1024-FFT size, segment ID after E, F, G, H, A, B, C, D, E, F, G, H, A, B, C, and D are sequentially modulated. It is mapped to the SA-preamble subcarrier set corresponding to.

The cyclic shift may be applied to three consecutive subcarriers after subcarrier mapping according to Equation 2. Each subblock has the same offset, and the cyclic shift pattern for each subblock is [2,1,0, ..., 2,1,0, ..., 2,1,0,2,1 , 0, DC, 1,0,2,1,0,2, ..., 1,0,2, ..., 1,0,2]. Here, the shift includes a right cyclic shift.

7 illustrates an SA-preamble structure in the frequency domain for 512-FFT. For the 512-FFT size, the blocks (A, B, C, D, E, F, G, H) each experience the right cyclic shift of (0, 2, 1, 0, 1, 0, 2, 1). Can be.

Tables 2-4 illustrate 128 SA-preamble sequences each. The parent sequence is indicated by index q and indicated in hexadecimal format. The sequences of Tables 2 to 4 may correspond to segments 0 to 2, respectively. In Tables 2 to 4, blk represents a subblock constituting each sequence.

The modulation sequence consists of the hexadecimal sequence X _i ^(q) (X = A, B, C, D, E, F, G, H) with two QPSK symbols v _2i ^(q) and v _{2i + 1} ^(q) It is obtained by converting into. Here, i represents the integer of 0-8, q represents the integer of 0-127. Equation 5 shows an example of converting X _i ^(q) into two QPSK symbols.

이다. 상기 식에 의해, 이진수 00, 01, 10 및 11은 각각 1, j, -1 및 -j로 변환된다. 그러나, 이는 예시로서, X_i ^(q)는 유사한 다른 식을 이용하여 QPSK 심볼로 변환될 수 있다.From here,

to be. By the above formula, binary numbers 00, 01, 10 and 11 are converted to 1, j, -1 and -j, respectively. However, as an example, X _i ^(q) may be converted to a QPSK symbol using other similar equations.

For example, when the sequence index (q) is 0, the sequence of subblock A is 314C8648F, and the sequence is [+1 -j +1 + j + j +1 -j +1 -1 +1 + j -1 + j +1 -1 +1 -j -j].

On the other hand, the 128 sequences illustrated in each table can be doubled using complex conjugate operations. That is, an additional 128 sequences may be generated by the complex conjugate operation, and the generated sequences may be given an index of 128 to 255. That is, the SA-preamble sequence of the sequence index x corresponding to one segment ID is in a complex conjugate relationship with the SA-preamble sequence of the sequence index x + 128 corresponding to the one segment ID. Equation 6 below shows a sequence extended from the parent sequence by a complex conjugate operation.

Here, k represents an integer of 0 to N _SAP -1, N _SAP represents the length of the SA-preamble, and complex conjugate operation (·) ^* changes the complex signal of a + jb to the complex signal of a-jb Then, the complex signal of a-jb is changed into a complex signal of a + jb.

As described above, the SA-preamble received from the ABS (Advanced Base Station) is used to obtain a cell identifier. That is, the AMS (Advanced Mobile Station) may compare the auto correlation or cross correlation of the SA-preamble sequence received from the ABS with the auto correlation or cross correlation of the SA-preamble sequence of Tables 2 to 4 above. Compare and detect matching sequences. However, since the sequence of the sequence index X and the sequence of the sequence index X + 128 have a complex conjugate relationship, when it is determined whether the sequence having the sequence index 0 matches the SA-preamble sequence received using autocorrelation or cross correlation, The sequence having the sequence index 128 may determine whether to match the received SA-preamble sequence without using autocorrelation or cross correlation. In other words, instead of calculating autocorrelation or cross correlation for SA-preamble sequences corresponding to all cell identifiers, a cell identifier is detected by performing a procedure of calculating auto correlation or cross correlation for only half of the SA-preamble sequence. can do. As a result, the UE acquires the segment ID n and the sequence index q value in the matching SA-preamble sequence, and determines the cell identifier according to Equation 3.

Although not using autocorrelation or cross correlation of sequences in complex conjugated relationship, comparing all SA-preamble sequences of Tables 2-4 with the SA-preamble sequence received from ABS is an overhead for the UE. In addition, in order for the AMS to handover from the serving ABS to the target ABS, the AMS must know whether the target ABS can be connected as a public ABS, and therefore, even when the target ABS is the public ABS, the macro ABS and the macro hot zone (Hot- zone) ABS, relay ABS, Open Subscriber Group (OSG) femto ABS must be known, and even in case of dedicated ABS, CSG-close ABS and CSG-open ABS must be known.

Therefore, all SA-preamble sequences of Tables 2 to 4 need to be partitioned according to the ABS type, and the AMS recognizes the type of the target ABS and the SA-preamble sequences of the specific partition and the received SA-preamble. Only cell sequences can be obtained by comparing sequences.

Specifically, 256 or 768 SA-preamble sequences (or cell identifiers) for each segment are partitioned according to the ABS type. In this case, since the AMS knows in advance which type of ABS it should connect to, it compares the received SA-preamble sequence with the SA-preamble sequences present in the specific partition to detect a matching sequence and uses the cell. Determine the identifier.

8 illustrates an SA-preamble sequence partitioning scheme according to an embodiment of the present invention.

Referring to FIG. 8, the SA-preamble sequences shown in Tables 2 to 4 or corresponding cell identifiers are partitioned into a plurality of non-overlapping subsets, and each subset is used exclusively for a specific ABS type. Such SA-preamble sequence segmentation may be changed flexibly according to the operator's situation, and such segmentation information needs to be transmitted to the AMS with minimal overhead.

First, assuming that the number of SA-preamble sequences or cell identifiers for macro ABS is fixed, SA-preamble sequence partitioning is performed in two steps as follows.

As a first step, the SA-preamble sequence (or cell identifier) for public ABS and private ABS, for example, the SA-preamble sequence (or Closed Subscriber Group) femto ABS, as shown by reference numeral 800 (or Cell identifier). The first stage partitioning can provide information on whether all AMSs have access to the target ABS.

As a second step, the SA-preamble sequence partition for the public ABS can be further refined according to the type of the public ABS as shown by reference number 850, for example, a macro hot-zone ABS, a relay ABS, and an Open Subscriber Group (OSG) femto ABS. To be partitioned. Similarly, the SA-preamble sequence partition for the dedicated ABS is further partitioned according to the type of dedicated ABS, for example, CSG-close ABS and CSG-open ABS.

At this time, since the boundary points of the common ABS and the dedicated ABS, the sequence index (0 to 257) and the last sequence index (767) of the macro ABS among the common ABS are already known, the boundary point information of the hot zone ABS and the relay ABS, the relay ABS and the OSG- The boundary point information between the femto ABS and the boundary point information between the CSG-close ABS and the CSG-open ABS, that is, the total three boundary point information may be provided. The three boundary point information may inform the ABS of the target ABS through broadcast information, for example, an AAI (Advanced Air Interface) _SCD (System Configuration Descriptor) message, which is a Media Access Control (MAC) control message.

In the present invention, the first step partitioning process will be described in more detail.

Assuming that the number of SA-preamble sequences (or cell identifiers) for the macro ABS in the common ABS is fixed for each segment by X, the target ABS is information on the 1 st partitioning, except that q is the X to z except for the macro ABS. It corresponds to the public ABS, and z to 255 may provide the AMS with information that corresponds to the Closed Subscriber Group (CSG) femto ABS.

In the present invention, the target ABS sends the SMS information about the boundary point z of the SA-preamble sequence (or cell identifier) for the common ABS and the SA-preamble sequence (or cell identifier) for the dedicated ABS to the AMS. Broadcast using 4 bit information included in SFH SP3 (Secondary-Super Frame Header Subpacket3). In this case, the 4-bit information means a SA-Preamble sequence soft partitioning information field of S-SFH SP3.

A z value broadcast through S-SFH SP3, i.e., which SA-preamble sequence (or cell identifier) is a sequence for a common ABS, may be indicated. In this case, granularity of a range in which the boundary point may be located may be determined according to the number of SA-preamble sequences corresponding to the pre-occupied macro ABS among the common ABS. When the total number of SA-preamble sequences or all cell identifiers is 768 and the divided SAs are divided into three segment sets (Reuse-3), there are 256 SA-preamble sequences or cell identifiers for each segment.

Meanwhile, the cell identifier and the SA-preamble sequence correspond to one cell identifier and one SA-preamble sequence as shown in Equation 3, and the adjacent cell identifier is another SA-preamble sequence having a complex conjugate relationship with the one SA-preamble sequence. Corresponds to. For example, adjacent cell identifiers 0 and 1 correspond to SA-preamble sequence indexes (q) 0 and 128, respectively. In addition, adjacent cell identifiers 2 and 3 correspond to SA-preamble sequence indexes (q) 1 and 129, respectively, and adjacent cell identifiers 254 and 255 correspond to SA-preamble sequence indexes (q) 127 and 255, respectively.

In such a case, in order to reduce the sequence detection complexity, the AMS preferably compares the SA-preamble mother sequence and the SA-preamble sequence in a complex conjugate relationship with the SA-preamble sequence received. Therefore, the partitioned SA-preamble sequence preferably sets the granularity in the range of 6 (3 * 2) in the total 768 sequences. In other words, granularity must be set in multiples of 2 in 256 sequences for each segment. In addition, since partitioning consecutive numbers is one of ways to reduce complexity, it is preferable to partition based on a cell identifier in the following.

In the present invention, for convenience of description, it is assumed that a total of 258 SA-preamble sequences or cell identifiers for 258/3 = 86 macro ABSs are occupied for macro ABSs among common ABSs. Therefore, the number of SA-preamble sequences or cell identifiers for the remaining ABS except for the macro ABS is 510 (768-258), which can indicate the boundary point position within a specific granularity range.

If SFH SP3 informs the boundary information with 4 bits, there may be a total of 16 boundary points. The 510 SA-preamble sequences (or cell identifiers) may be set to 30 sequences (or cell identifiers) and 10 sequences (or cell identifiers) for each segment. An example of partitioning a cell identifier or SA-preamble sequence based on this is illustrated in Table 5 below.

In Table 5, n represents a segment ID. The range of the cell identifier corresponding to the common ABS corresponding to each of the 4-bit information included in the SFH SP3 and the range of the cell identifier corresponding to the dedicated ABS are shown.

For example, when the information 0000 is received through SFH SP3, the AMS indicates that the cell identifiers corresponding to the common ABS are the cell identifiers 86 through 95 of the segment 0, the cell identifiers 342 through 351 of the segment 1, and the cells of the segment 2 It can be seen that the identifiers 598 through 607.

Similarly, when receiving information 1011 through SFH SP3, the AMS indicates that the cell identifiers corresponding to the common ABS are the cell identifiers 86 to 205 of segment 0, the cell identifiers 342 to 461 of segment 1, and the cell identifier 598 of segment 2. From 717 it can be seen that.

On the other hand, according to Table 5, if all of the cases except the macro cell is a dedicated ABS or all cases are a common ABS, a problem may be a waste of the cell identifier. For example, if all cases except the macro cell are dedicated ABS, even if the information 0000 is received through the SFH SP3, it can be seen that 10 identifiers corresponding to the common ABS except the macro cell are allocated for each segment. .

Table 6 below is an example in which 20 sequences of granularities per segment are applied in some cases to support a case where all cases are common ABS or all cases except macro cell are dedicated ABS.

Referring to Table 6, when the information 0000 is received through the SFH SP3, the AMS may recognize that all cell identifiers except the cell identifier corresponding to the macro cell are the cell identifier corresponding to the dedicated ABS. In addition, when information 1111 is received through SFH SP3, the AMS may recognize that all cell identifiers are cell identifiers corresponding to the common ABS.

Like the first step, the two-step partitioning process may set the granularity by 30 sequences (or cell identifiers) and 10 sequences (or cell identifiers) for each segment to inform the boundary point position. However, the first step is sufficient to inform only one boundary point information, but the second step should inform the AMS of up to three boundary point information as described above.

9 illustrates a block diagram of a transmitter and a receiver according to an embodiment of the present invention. In downlink, transmitter 910 is part of a base station and receiver 950 is part of a terminal. In uplink, transmitter 910 is part of a terminal and receiver 950 is part of a base station.

At transmitter 910, processor 920 encodes, interleaves, and symbol maps data (eg, traffic data and signaling) to generate data symbols. In addition, the processor 920 generates pilot symbols to multiplex the data symbols and the pilot symbols.

The modulator 930 generates a transmission symbol according to a wireless access scheme. Radio access schemes include FDMA, TDMA, CDMA, SC-FDMA, MC-FDMA, OFDMA, or a combination thereof. In addition, the modulator 930 enables data to be distributed and transmitted in the frequency domain using various permutation methods illustrated in the embodiment of the present invention. The radio frequency (RF) module 932 processes (eg, analog converts, amplifies, filters, and frequency upconverts) the transmit symbol to generate an RF signal transmitted through the antenna 934.

At the receiver 950, the antenna 952 receives the signal transmitted from the transmitter 910 and provides it to the RF module 954. The RF module 954 processes (eg, filters, amplifies, frequency downconverts, digitizes) the received signal to provide input samples.

Demodulator 960 demodulates the input samples to provide a data value and a pilot value. Channel estimator 980 derives a channel estimate based on the received pilot values. Demodulator 960 also performs data detection (or equalization) on the received data values using the channel estimates and provides data symbol estimates for transmitter 910. In addition, the demodulator 960 may perform reverse operation on the various permutation methods illustrated in the embodiment of the present invention to rearrange the data distributed in the frequency domain and the time domain in the original order. Processor 970 symbol demaps, deinterleaves, and decodes the data symbol estimates and provides decoded data.

In general, the processing by demodulator 960 and processor 970 at receiver 950 is complementary to the processing by modulator 930 and processor 920 at transmitter 910, respectively.

Controllers 940 and 990 supervise and control the operation of the various processing modules present in transmitter 910 and receiver 950, respectively. Memory 942 and 992 store program codes and data for transmitter 910 and receiver 950, respectively.

The module illustrated in FIG. 9 is for illustrative purposes, and the transmitter and / or receiver may further include necessary modules, some modules / functions may be omitted, or may be separated into different modules, and two or more modules may be one module. It can be integrated into.

The embodiments described above are the components and features of the present invention are combined in a predetermined form. Each component or feature is to be considered optional unless stated otherwise. Each component or feature may be implemented in a form that is not combined with other components or features. It is also possible to combine some of the components and / or features to form an embodiment of the invention. The order of the operations described in the embodiments of the present invention may be changed. Some configurations or features of certain embodiments may be included in other embodiments, or may be replaced with corresponding configurations or features of other embodiments. It is obvious that the claims may be combined to form an embodiment by combining claims that do not have an explicit citation relationship in the claims or as new claims by post-application correction.

In this document, the embodiments of the present invention have been mainly described with reference to the data transmission / reception relationship between the terminal and the base station. The specific operation described as performed by the base station in this document may be performed by an upper node in some cases. That is, it is apparent that various operations performed for communication with a terminal in a network including a plurality of network nodes including a base station can be performed by a network node other than the base station or the base station. A 'base station' may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), an access point, and the like. In addition, the term "terminal" may be replaced with terms such as a user equipment (UE), a mobile station (MS), a mobile subscriber station (MSS), and the like.

Embodiments according to the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof. In the case of a hardware implementation, an embodiment of the present invention may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), FPGAs ( field programmable gate arrays), processors, controllers, microcontrollers, microprocessors, and the like.

In the case of implementation by firmware or software, an embodiment of the present invention may be implemented in the form of a module, procedure, function, etc. that performs the functions or operations described above. The software code may be stored in a memory unit and driven by a processor. The memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit of the invention. Accordingly, the above detailed description should not be construed as limiting in all aspects and should be considered as illustrative. The scope of the invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the invention are included in the scope of the invention.

The present invention can be applied to a wireless communication system. Specifically, the present invention can be applied to a wireless mobile communication device used for a cellular system.

Claims (36)

A method for transmitting cell type information by a base station in a wireless communication system,
Broadcasting the boundary point information (Z) of the cell identifier of the public ABS (Advanced Base Station) and the cell identifier (Cell Identity) of the private ABS through the S-SFH Secondary-Super Frame Header SubPacket3 (SP3). Including;
The boundary point information Z is
Range information of a total of 16 cell identifier partitions partitioned into 10 or 20 sequence granularities per segment,
The range information of the cell identifier section is
Wherein all cell identifiers contain information that is a cell identifier for a dedicated ABS or that all cell identifiers except for macro ABS are cell identifiers for a common ABS,
Method of transmitting cell type information. The method of claim 1,
The dedicated ABS,
Which is a Closed Subscriber Group (CSG) femto ABS,
Method of transmitting cell type information. The method of claim 1,
The boundary point information Z is
Containing 86 cell identifiers for macro ABS per segment,
Method of transmitting cell type information. The method of claim 3, wherein
The boundary point information Z is
256 * segment ID to 85 + 256 * segment ID are cell identifiers for macro ABS among public ABS, and 86 + 256 * segment ID to Z + 256 * segment ID are cell identifiers for public ABS except macro ABS, Z + 1) + 256 * segment ID to 255 + 256 * segment ID, indicating that the cell identifier for the CSG femto ABS,
Method of transmitting cell type information. The method of claim 4, wherein
The segment ID is
Which is an integer of 0 to 2,
Method of transmitting cell type information. The method of claim 1,
The size of the boundary point information Z,
4 bit,
Method of transmitting cell type information. The method of claim 1,
The boundary point information Z is
Broadcast through the SA-Preamble sequence soft partitioning information field of the S-SFH SP3,
Method of transmitting cell type information. The method of claim 1,
The common ABS,
Including macro ABS, macro hot-zone ABS, relay ABS and Open Subscriber Group (OSG) femto ABS,
Method of transmitting cell type information. The method of claim 1,
The dedicated ABS,
Including CSG-close ABS and CSG-open ABS,
Method of transmitting cell type information. A processor for setting boundary point information (Z) of a cell identifier of a public ABS and a cell identifier of a private ABS; And
A transmission module for broadcasting the boundary point information (Z) through S-SFH SP3 (Secondary-Super Frame Header SubPacket3),
The boundary point information Z is
Range information of a total of 16 cell identifier partitions partitioned into 10 or 20 sequence granularities per segment,
The range information of the cell identifier section is
Wherein all cell identifiers contain information that is a cell identifier for a dedicated ABS or that all cell identifiers except for macro ABS are cell identifiers for a common ABS,
Base station device. The method of claim 10,
The dedicated ABS,
Which is a Closed Subscriber Group (CSG) femto ABS,
Base station device. The method of claim 10,
The boundary point information Z is
Containing 86 cell identifiers for macro ABS per segment,
Base station device. The method of claim 12,
The boundary point information Z is
256 * segment ID to 85 + 256 * segment ID are cell identifiers for macro ABS among public ABS, and 86 + 256 * segment ID to Z + 256 * segment ID are cell identifiers for public ABS except macro ABS, Z + 1) + 256 * segment ID to 255 + 256 * segment ID, indicating that the cell identifier for the CSG femto ABS,
Base station device. The method of claim 13,
The segment ID is
Which is an integer of 0 to 2,
Base station device. The method of claim 10,
The size of the boundary point information Z,
4 bit,
Base station device. The method of claim 10,
The boundary point information Z is
Broadcast through the SA-Preamble sequence soft partitioning information field of the S-SFH SP3,
Base station device. The method of claim 10,
The common ABS,
Including macro ABS, macro hot-zone ABS, relay ABS and Open Subscriber Group (OSG) femto ABS,
Base station device. The method of claim 10,
The dedicated ABS,
Including CSG-close ABS and CSG-open ABS,
Base station device. In the method of receiving cell type information in a wireless communication system,
Receiving a S-SFH Secondary-Super Frame Header SubPacket (S3) from a base station;
Obtaining boundary point information (Z) of a cell identifier of a public ABS and a cell identifier of a private ABS from the S-SFH SP3;
The boundary point information Z is
Range information of a total of 16 cell identifier partitions partitioned into 10 or 20 sequence granularities per segment,
The range information of the cell identifier section is
Wherein all cell identifiers contain information that is a cell identifier for a dedicated ABS or that all cell identifiers except for macro ABS are cell identifiers for a common ABS,
Method of receiving cell type information. The method of claim 19,
The dedicated ABS,
Which is a Closed Subscriber Group (CSG) femto ABS,
Method of receiving cell type information. The method of claim 19,
The boundary point information Z is
Containing 86 cell identifiers for macro ABS per segment,
Method of receiving cell type information. The method of claim 21,
The boundary point information Z is
256 * segment ID to 85 + 256 * segment ID are cell identifiers for macro ABS among public ABS, and 86 + 256 * segment ID to Z + 256 * segment ID are cell identifiers for public ABS except macro ABS, Z + 1) + 256 * segment ID to 255 + 256 * segment ID, indicating that the cell identifier for the CSG femto ABS,
Method of receiving cell type information. The method of claim 21,
The segment ID is
Which is an integer of 0 to 2,
Method of receiving cell type information. The method of claim 19,
The size of the boundary point information Z,
4 bit,
Method of receiving cell type information. The method of claim 19,
The boundary point information Z is
Received through the SA-Preamble sequence soft partitioning information field of the S-SFH SP3,
Method of receiving cell type information. The method of claim 19,
The common ABS,
Including macro ABS, macro hot-zone ABS, relay ABS and Open Subscriber Group (OSG) femto ABS,
Method of receiving cell type information. The method of claim 19,
The dedicated ABS,
Including CSG-close ABS and CSG-open ABS,
Method of receiving cell type information. A receiving module for receiving S-SFH SP3 (Secondary-Super Frame Header SubPacket3); And
And a processor for obtaining boundary point information (Z) of a cell identifier of a public ABS and a cell identifier of a private ABS from the S-SFH SP3.
The boundary point information Z is
Range information of a total of 16 cell identifier partitions partitioned into 10 or 20 sequence granularities per segment,
The range information of the cell identifier section is
Wherein all cell identifiers contain information that is a cell identifier for a dedicated ABS or that all cell identifiers except for macro ABS are cell identifiers for a common ABS,
Terminal device. 29. The method of claim 28,
The dedicated ABS,
Which is a Closed Subscriber Group (CSG) femto ABS,
Terminal device. 29. The method of claim 28,
The boundary point information Z is
Containing 86 cell identifiers for macro ABS per segment,
Terminal device. 31. The method of claim 30,
The boundary point information Z is
256 * segment ID to 85 + 256 * segment ID are cell identifiers for macro ABS among public ABS, and 86 + 256 * segment ID to Z + 256 * segment ID are cell identifiers for public ABS except macro ABS, Z + 1) + 256 * segment ID to 255 + 256 * segment ID, indicating that the cell identifier for the CSG femto ABS,
Terminal device. The method of claim 31, wherein
The segment ID is
Which is an integer of 0 to 2,
Terminal device. 29. The method of claim 28,
The size of the boundary point information Z,
4 bit,
Terminal device. 29. The method of claim 28,
The boundary point information Z is
Received through the SA-Preamble sequence soft partitioning information field of the S-SFH SP3,
Terminal device. 29. The method of claim 28,
The common ABS,
Including macro ABS, macro hot-zone ABS, relay ABS and Open Subscriber Group (OSG) femto ABS,
Terminal device. 29. The method of claim 28,
The dedicated ABS,
Including CSG-close ABS and CSG-open ABS,
Terminal device.

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