WO2009154410A2 - Procédé de transmission d'informations d'id de couche physique - Google Patents

Procédé de transmission d'informations d'id de couche physique Download PDF

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Publication number
WO2009154410A2
WO2009154410A2 PCT/KR2009/003270 KR2009003270W WO2009154410A2 WO 2009154410 A2 WO2009154410 A2 WO 2009154410A2 KR 2009003270 W KR2009003270 W KR 2009003270W WO 2009154410 A2 WO2009154410 A2 WO 2009154410A2
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WIPO (PCT)
Prior art keywords
cell
scrambling
information
csg
phase modulation
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PCT/KR2009/003270
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English (en)
Korean (ko)
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WO2009154410A3 (fr
Inventor
한승희
권영현
드라간 뷔쉬
김동철
문성호
곽진삼
노민석
이현우
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엘지전자 주식회사
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Priority claimed from KR20080080199A external-priority patent/KR101481522B1/ko
Application filed by 엘지전자 주식회사 filed Critical 엘지전자 주식회사
Priority to US12/999,876 priority Critical patent/US8515472B2/en
Publication of WO2009154410A2 publication Critical patent/WO2009154410A2/fr
Publication of WO2009154410A3 publication Critical patent/WO2009154410A3/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/26—Network addressing or numbering for mobility support

Definitions

  • the following description relates to a method of transmitting cell identification information in a wireless communication system, and specifically, to a method of efficiently delivering additional cell identification information with minimal impact on an existing system.
  • the cell identification information refers to an identifier for identifying a cell having a specific location area in a wireless network.
  • the particular location area here coordinates radio related tasks within the coverage area and includes at least one base station (BTS or Node B) that provides a connection over the air interface between the network and the mobile station (or UE).
  • the base station (BTS, Node B or eNode B) described above is an access point for indoor or outdoor coverage.
  • an access point for home coverage is a femtocell, a Node B, an evolved Home NodeB (eHNB), or a Closed Subscriber, which is a small cell base station generally used in a residential or small business environment. Group).
  • a small base station is referred to collectively as a "CSG” or "CSG cell” for convenience of description. It is not necessary to limit the meaning of the term.
  • the CSG is connected to the operator's network by means of broadband connections such as DSL or cable. Such CSG is not allowed to allow cell operators to access or be restricted. To extend indoor service coverage.
  • the most problem in the current standardization step for such a CSG is to define a cell ID for the UE to distinguish whether the cell is a CSG or a CSG cell at an early stage of cell identification. This is because a particular UE may be allowed to connect to that CSG while another UE may not be allowed to connect to that CSG.
  • the UE may receive a signal through the lower layer and may read the upper layer ID information only after completing the initial cell discovery. If the read upper layer ID is a CSG cell to which the UE is not allowed to access, the UE has unnecessary power consumption and time delay.
  • the present invention is to propose a method for the UE to easily perform the discovery and identification of the CSG cell in the initial stage of cell discovery.
  • the present invention provides a more general method of transmitting additional physical layer identification information to the existing cell ID information as well as searching for the CSG cell.
  • the existing sal A method of transmitting additional physical layer cell ID information by increasing the number of IDs is provided.
  • PSS primary synchronization signal
  • SSS secondary synchronization signal
  • the physical layer cell ID related information may indicate the cell ID information of the serving cell and the service attribute of the serving cell.
  • the service attribute is determined by the serving cell.
  • the cell ID information of the serving cell may be all or part of the serving cell ID information.
  • a CSGC Closed Subscriber Group (CSGC) cell ID is displayed when the sub-synchronous signal is transmitted after the main synchronization signal is transmitted, and a cell other than the CSG cell is transmitted when the main synchronization signal is transmitted after the sub-synchronous signal is transmitted. It may be set to indicate an ID.
  • CSGC CSGC Closed Subscriber Group
  • two sub-synchronization channels (Secondary) according to the combination of the first segment and the second segment, respectively, in the method for transmitting physical layer cell ID information
  • Synchronization Channel Performing scrambling according to any one of first type scrambling or second type scrambling to the S-SCH) signal; And transmitting the scrambled two signals as two sub-synchronization codes (SSCs), wherein the first type scrambling and the second type scrambling are performed by the first type scrambling.
  • SSCs sub-synchronization codes
  • the first type scrambling and the second type scrambling are performed by the first type scrambling.
  • a combination of main sync code based scrambling sequences multiplied by each sub-sync code, and a scrambling sequence multiplied by each sub sync code is classified by the scrambling method, and a method of indicating physical layer cell ID related information is provided according to which of the first type scrambling and the second type scrambling is applied in the scrambling step.
  • the physical layer cell ID related information includes whether the serving cell is a closed subscriber group (CSG) cell, a relay station cell, a multimedia broadcast multicast service (MBMS) indicator, a hot spot. Can represent one or more of the indicators.
  • CSG closed subscriber group
  • MBMS multimedia broadcast multicast service
  • the two sub-synchronization codes transmitted indicate a CSG cell ID
  • the transmission The two sub-synchronization codes may be set to indicate cell IDs other than the CSG cell.
  • the first type scrambling is performed by applying scrambling to a second segment using a scrambling sequence based on the first segment, and the second type scrambling uses a scrambling sequence based on the second segment. By performing scrambling on the first segment.
  • the main sync code based scrambling sequence includes a first main sync code based scrambling sequence and a second main sync code based scrambling sequence, wherein the first type scrambling is one of the two sub sync channel signals.
  • Part 1. Sync Channel The first type of scrambling is performed as scrambling using the first main sync code based scrambling sequence to the signal and the second main sync code based scrambling sequence to the second secondary sync channel signal.
  • the second main sync code based scrambling sequence may be set to a signal, and the second sub sync channel signal may be set as scrambling using the first main sync code based scrambling sequence.
  • the second type scrambling may be set differently from the first type scrambling in at least one of a main synchronous code based scrambling sequence used, the first segment based scrambling sequence and the second segment based scrambling sequence. It may be.
  • the physical layer cell ID information transmission method performing phase modulation according to any one of different types of phase modulation preset to two sub-synchronization codes (SSCs). ; And transmitting the phase modulated two sub-synchronization codes, wherein the preset different types of phase modulation are divided according to different lengths of two code values multiplied by the two sub-synchronization codes.
  • the phase modulation step there is provided a method of transmitting cell ID information indicating physical layer cell ID-related information according to whether different preset types of phase modulation schemes are applied.
  • the preset different types of phase modulation include a first type phase modulation and a second type phase modulation, and the first type phase modulation and the second type phase modulation constitute the two sub-sync codes.
  • the first code and the second code have different combinations of phase modulation of any one of BPSK, QPSR or M-PSK.
  • the CSG cell may be configured to represent a CSG cell when the first type phase modulation is applied and to indicate a cell other than the CSG cell when the second type phase modulation is applied.
  • the preset different types of phase modulation may include first type phase modulation, second type phase modulation, and third type phase information
  • the first type phase modulation to the third type phase modulation may include the two types of phase modulation.
  • the first code and the second code constituting the auxiliary sync code are performed by applying different combinations in any one of the phase modulation of the BPSK method, the QPSK method, or the M-PSK method, and the first type phase modulation is applied.
  • the CSG cell may be represented, and when the second type phase modulation is applied, the repeater cell may be represented.
  • the CSG cell may be set to indicate a cell other than the CSG cell or the repeater cell.
  • the method may further include: selecting a sequence having a root index of any one of the first to fourth tote index increments; And transmitting the selected sequence as a main sync code (PSC), wherein any one of the first to fourth root indices is set to indicate specific cell ID related information in addition to the general cell ID.
  • PSC main sync code
  • the fourth root index is divided into two pairs, the first pair and the second pair, and the sum of the root indices belonging to the first pair and the second pair is a cell corresponding to the generation length of the sequence transmitted as the main sync code.
  • the specific cell ID related information may indicate the cell ID information of the serving cell and the service attribute of the serving cell.
  • the service attribute is whether the serving cell is a CSG Closed Subscriber Group cell, a relay station cell, MBMS (Multimedia Broadcast Multicast Service) indicator, may indicate one or more of the hot spot indicator.
  • the cell ID information of the serving cell may be all or part of the serving cell ID information.
  • another aspect of the present invention provides a method of using a portion of the existing cell ID increase is reserved for additional physical layer cell ID information transmission.
  • PSC main synchronization code
  • the sum of the root indices except for the root index indicating the specific cell ID related information other than the general cell ID among the third root index is based on the generation length of the sequence transmitted as the main sync code, and in addition to the general cell ID.
  • the root index indicating the specific cell ID related information provides a cell ID information transmission method in which a sum with any one of other root indexes does not correspond to a generation length of a sequence transmitted as the main sync code.
  • the specific cell ID related information may indicate the cell ID information of the serving cell and the service attribute of the serving cell.
  • the service attribute may indicate whether the serving cell is a closed subscriber group (CSG) cell, a relay station cell, a multimedi broadcast multicast service (MBMS) indicator, or a hot spot indicator. Can be.
  • the cell ID information of the serving cell may be all or part of the serving cell ID information.
  • Yet another embodiment provides a method of selecting a first index ni 0 and a second index y as a combination for distinguishing a cell group ID; And transmitting two sequences of length M according to the selected first index and second index combination (m 0 , m) as two sub-sync codes, wherein the selected (m 0 , mi ) is selected.
  • the two sub-synchronization codes indicate specific cell ID related information in addition to the general cell ID.
  • the two floating channel codes are General cell ID information
  • the first group includes two M-length sequence combinations, and indexes overlapping each index included in the combination of (m 0 , mi) and (rm, m 0 ) among all possible combinations.
  • Cell ID information including a minimum, and a combination of a number of combinations satisfying a condition where the difference between m 0 and t is minimum, and a combination of a number of combinations necessary to represent specific cell ID related information other than the general cell ID; Provide a transmission method.
  • the first group when the first group is additionally set to an existing combination of (mo, mi), it may be regarded as adding cell ID information according to an aspect of the present invention.
  • a combination reserved for additional information transmission in the set (nio, n) combination it may be viewed as a form in which part of the existing cell ID information is reserved according to another aspect of the present invention.
  • the present invention it is possible to efficiently transmit additional physical layer cell ID information while minimizing the influence on the existing system.
  • the cell ID information various information as well as CSG cell ID information and repeater cell ID information may be transmitted.
  • [Brief Description of Drawings] 1 shows an example of a radio frame structure using a general CP normal cyclic prefix.
  • 2 shows another example of a radio frame using an extended CKextended CP).
  • 3 shows an example of mapping a sequence to a subcarrier region in a P-SCH.
  • FIG. 4 is a diagram conceptually illustrating two short code combinations used in a 3GPP LTE system among all the short combinations of two short codes available for S-SCH.
  • FIG. 5 is a diagram illustrating a concept of main synchronization signal based scrambling and segment 1 based scrambling performed to solve an ambiguity problem of floating signal transmission in a 3GPP LTE system.
  • FIG. 6 is a diagram for describing a neighbor search scenario.
  • FIG. 7 is a diagram illustrating a structure of a multi-absorption relay system to which a cell ID extension / reservation method according to each embodiment of the present invention can be applied.
  • FIG. 8 is a diagram illustrating a time relationship between an SSS and a PSS in a frame.
  • FIG. 9 is a diagram illustrating a method of transmitting additional information by changing a time position between an SSS and a PSS according to an embodiment of the present invention.
  • FIG. 10 is a diagram for describing a problem that may occur when only the synchronization signal swapping method is used.
  • FIG. 11 is a diagram for describing a delamination problem that may occur when the same PSS based scrambling code is used for an auxiliary sync signal.
  • downlink means communication from a base station (BS) to a user equipment (IE), and uplink means communication from a terminal to a base station.
  • BS base station
  • IE user equipment
  • uplink means communication from a terminal to a base station.
  • a base station generally refers to a fixed station communicating with a terminal, and may be referred to in other terms such as a node-B, a BTSCbase transceiver system, and an access point.
  • the terminal may be fixed or mobile, and may be called by other terms such as MSCniobile station, UTdiser terminal, SS (subscriber station), and wireless device.
  • the present invention proposes a method for allowing a UE to easily perform discovery and identification of a CSG cell in an initial stage of cell discovery.
  • the initial cell discovery process in the 3GPP or 3GPP 3rd Generation Partnership Project Long Term Evolution (LTE) system will be described. It will be discussed whether it is possible to enable the discovery and identification of additional cells while minimizing, specifically, as described above and whether to enable the discovery and identification of CSG cells.
  • LTE Long Term Evolution
  • the 3rd Generation Partnership Project (3GPP) Wideband Code Division Multiple Access (WCDMA) system uses a total of 512 long pseudo noise scrambling codes to distinguish base stations. That is, the base stations use different long PN scrambling codes as the scrambling codes of the downlink channels.
  • the terminal When power is applied to the terminal, the terminal performs a process of system synchronization of the initial cell and obtaining a long PN scrambling code identifier of the initial cell. This is called a cell search process.
  • the initial cell is determined according to the position of the terminal when the power is applied, and generally means a cell of the base station corresponding to the largest signal component among the signal components of each base station included in the downlink received signal of the terminal. .
  • 512 long PN scrambling codes are divided into 64 code groups to facilitate cell discovery, and a primary or primary synchronization channel (P-SCH) and a secondary or secondary synchronization channel are used.
  • a downlink channel including a Secondary Synchronization Channel (S-SCH) is used.
  • the primary synchronization channel is used to allow the terminal to acquire slot synchronization
  • the secondary synchronization channel is used to allow the terminal to acquire frame synchronization and scrambling code groups.
  • the cell search includes an initial cell search performed initially after the UE is powered on, and a non-initial cell search that performs handover or neighbor cell measurement. Separated by.
  • the initial cell search method is largely performed in three steps.
  • a terminal acquires slot synchronization using a primary synchronization signal (PSS) transmitted through a P-SCH.
  • PSS primary synchronization signal
  • each frame includes 15 slots, and each base station transmits the PSS by including it in the frame.
  • the same PSS is used for all 15 slots, and all base stations also use the same PSS.
  • the terminal acquires slot synchronization using a matched filter for the PSS.
  • a long PN scrambling code group and frame synchronization are obtained by using a slot synchronization and a secondary synchronization signal (SSS) transmitted through the S-SCH.
  • SSS secondary synchronization signal
  • a long PN scrambling code identifier corresponding to a long PN scrambling code used by an initial cell is detected using a common pilot channel code correlator based on frame synchronization and a long PN scrambling code group. . That is, since eight long PN scrambling codes are mapped to one long PN scrambling code group, the UE calculates a correlation value of each of the eight long PN scrambling codes belonging to its own code group, and based on the calculated result, the initial cell. Detect a long PN scrambling code identifier.
  • the wireless communication system may be a 0rthogonal frequency division multiplexing (0FDM) / 0rthogonal frequency division multiple access (0FDMA) based system.
  • OFDM uses multiple orthogonal subcarriers.
  • OFDM uses orthogonality between inverse fast Fourier Transform (IFFT) and fast Fourier Transform (FFT).
  • IFFT inverse fast Fourier Transform
  • FFT fast Fourier Transform
  • At the transmitter data is sent by performing an IFFT.
  • the receiver performs FFT on the received signal to recover the original data.
  • Transmitter to combine multiple subcarriers To use IFF! * And to separate multiple subcarriers, the receiver uses a vocal FFT.
  • 1 shows an example of a radio frame structure using a normal CP (normal cyclic prefix).
  • a radio frame includes 10 subframes, and one slot may include two slots.
  • One slot may include a plurality of OFDM symbols in the time domain.
  • the number of 0FOM symbols included in one slot may be variously determined according to the CP structure.
  • one slot may include 7 OFDM symbols.
  • the primary synchronization channel (P-SCH) is located in the last 0FDM symbol of the 0 th slot and the 10 th slot.
  • the same primary synchronization signal (PSS) is transmitted through two P-SCHs.
  • P_SCH is used to obtain time domain synchronization and / or frequency domain synchronization, such as 0FDM symbol synchronization and slot synchronization.
  • ZS (Zadoff-Chu) sequence can be used as the PSS, there is at least one PSS in the wireless communication system.
  • CAZAC sequence d (k) has three characteristics.
  • Equation 4 In Equation 2, the CAZAC sequence always means that the size is 1, and Equation 3 means that the auto correlation of the CAZAC sequence is represented by a Dirac-delta function. Here autocorrelation is based on circular correlat ions. Equation 4 means that the cross correlat ion is always constant.
  • the P-SCH of the 3GPP LTE system is defined as a 62-length Zadoff-Chu sequence (hereinafter referred to as "ZC sequence”) according to the following equation.
  • S-SCH Secondary Synchronization Channel
  • the S-SCH and the P-SCH may be located in contiguous OFDM symbols.
  • Different SSSCSecondary Synchronization Signals may be transmitted through two S—SCHs.
  • the S-SCH is used to obtain frame synchronization and / or CP configuration of a cell, that is, usage information of a general CP or an extended CP.
  • One S-SCH uses two SSSs. M-segments can be used with SSS. In other words, one m-SCH includes two m-times.
  • one S-SCH includes 63 subcarriers
  • two m-sequences of length 31 are mapped to one S-SCH.
  • the m-sequence is one of the PN sequences, and the PN sequence is similar to the random sequence ( ⁇ 1 001 sequence) while being reproducible.
  • the PN sequence has the following characteristics: (1) The repetition period is much longer. If the iteration period is infinitely long, it is a random sequence.
  • Run length 1 is 1/2, 2 is 1/4, 3 is 1/8, and so on. The run length is the same number of consecutive numbers.
  • Playback can be performed by an appropriate playback algorithm.
  • PN-Siemens includes the m-sequence, the Gold sequence, and the Kasami sequence. In addition to the above-mentioned properties, m-Siemens has an additional property of side-lobe of periodic auto-correlation —1.
  • the physical layer cell ID may be represented by 168 physical layer cell ID groups and three physical layer IDs belonging thereto. That is, the total physical layer cell ID is 504, and is represented by a physical layer ID having a range of 0 to 167 and a physical layer ID having a range of 0 to 2 included in each physical layer cell ID group.
  • Three ZC sequence root indexes representing physical layer IDs are used for the P-SCH, and 168 m-sequence indexes representing physical layer cell ID groups may be used for the S-SCH.
  • P-BCH Physical-Broadcast Channel
  • P ⁇ BCH occupies four 0FDM symbols starting from the 0th 0FDM symbol (symbol following P-SCH) of the 1st slot of the 0th subframe.
  • the P-BCH is used to obtain basic system configuration information of the base station.
  • P-BCH is It may have a period of 40ms.
  • FIG. 2 shows another example of a radio frame using an extended CP.
  • 6 OFDM symbols are included in one slot of a radio frame using an extended CP as compared to the radio frame shown in FIG. 1 using a general CP.
  • the P-SCH is located in the last OFDM symbol of the 0th slot and the 10th slot
  • the S-SCH is located in the last OFDM symbol immediately before the last 0FOM symbol of the 0th slot and the 10th slot.
  • the P-BCH is located in the 1st slot of the 0th subframe in a radio frame and occupies 4 0FDM symbols starting from the 0th 0FDM symbol (symbol following the P-SCH) of the 1st slot of the 0th subframe. do.
  • the ZC sequence is sequentially mapped from the leftmost subcarrier such that the center element of the ZC sequence, here the 31st element P (31), is mapped to the DC subcarrier.
  • a null value is inserted into a subcarrier (in this case, -32 subcarrier) to which a sequence is not mapped among mapping sections.
  • the sequence P 31 mapped to the DC subcarrier is punctured.
  • the left side and the right side refer to the left side as one side of the DC subcarrier for convenience, and the opposite side of the DC subcarrier as the right side, and is not necessarily limited to the illustrated position.
  • the size of the FFT window of the P-SCH and the length of the ZC sequence can vary. As a result, the mapping scheme of the sequence may be variously changed. ZC sequence may be symmetrically mapped around the DC subcarrier in the time domain.
  • a cell group ID and radio frame synchronization information may be transmitted to a secondary synchronization signal (SSS), and final information is transmitted by a combination of two short codes.
  • SSS secondary synchronization signal
  • the combination (m0, ml) of the two short codes indicating the cell group ID may be defined as follows.
  • a table of 168 cell group IDs using these two short code combinations is as follows.
  • the order of the combination ( m 0, ml) shown in Table 2 above can represent frame timing information. That is, ( ⁇ , ⁇ ) can mean the 0th (0n) s subframe random sync signal, and (ml ⁇ m0) can mean the 5th (5ms) sync signal.
  • Equation 6 Equation 6 and the above table within all possible combination ranges as a combination of (mO, ml)
  • the code may be referred to as SSCXSecondary Synchronization Code and is a circular shift of 31-length m-sequence generated from a polynomial of x 5 + x 2 + l. ) Can generate a total of 31 sequences.
  • Scrambling may be performed on the SSC with a scrambling sequence defined to be one-to-one with a Primary Synchronization Code (PSC).
  • PSC Primary Synchronization Code
  • PSC-based scrambling code is used to generate six different sequences by cyclic shift of a 31-length m sequence generated from a polynomial of x 5 + x 2 + l, and in two units. Three PSC indexes as shown in Table 1 and those defined in a one-to-many correspondence relationship are used.
  • ambiguity may still be a problem.
  • a neighboring cell A has a subsynchronization code combination having a (1,2) combination
  • a cell B transmits a subsynchronization code having a (3,4) combination
  • both cells transmit the same PSC code.
  • the scrambling code applied to the floating channel code is also the same, so the ambiguity problem as described above still remains.
  • segment 1 based scrambling may be performed in addition to the PSC based scrambling as described above in order to strengthen the binding force of (1, 2) and (3, 4).
  • the segment 1 represents the mO portion in the (m0, ml) combination
  • the segment 2 represents the ml portion as described above.
  • Segment 1 based scrambling refers to performing scrambling on the SSC of segment 2 with a scrambling code defined to correspond to the index of segment 1. Based on the case where the cell A uses the combination (1, 2) and the cell B uses the combination (3, 4) as in the above example, since the indexes 1 and 3 of the segment 1 are different codes, The defined scrambling code is also different, so that the above-mentioned ambiguity problem can be solved by strengthening the binding force of (1, 2) and (3, 4).
  • the segment 1 based scrambling code used at this time is 31 length-based m generated from a polynomial of 5 + ( 4 1 ⁇ 2 2 + ⁇ + 1 Eight different sequences are created by circular movement of the sequence, and are defined and used in a one-to-many correspondence with the index used for segment 1. That is, in the 3GPPLTE system, each segment is mapped to a segment 1 based scrambling sequence based on modulo 8. More specifically, the definition of the SSC and the scrambling code mentioned in the above description may be expressed as follows.
  • the 62 length sequence ⁇ (0) ni (61) used for the secondary synchronization signal (SSS) is used as an interleaved connection sequence of two 31 length binary sequences.
  • the interleaved connection sequence may be scrambled with a scrambling sequence given by a primary synchronization signal (PSS).
  • PSS primary synchronization signal
  • N is an integer based on 0-30 here.
  • MO and ml in Equation 7 are defined by Equation 6 by the physical layer cell ID group N ID (1) . For convenience, this is expressed again as Equation 8 below.
  • Equation 10 x (i + 5) ⁇ (xQ + 2) + j /) Jmod 0 ⁇ 25
  • FIG. 5 is a diagram illustrating a concept of main synchronization signal based scrambling and segment 1 based scrambling performed to solve an ambiguity problem of floating signal transmission in a 3GPP LTE system.
  • 501a and 501b of FIG. 5 represent scrambling codes zl based on segment 1 as shown in Equation 13, and 502a and 502b represent scrambling codes based on PSC.
  • Such two types of scrambling can solve the ambiguity problem that can occur in SSC transmission.
  • the final cell ID is a combination of N ID (2) and SSS ID of N (1) in the PSS
  • index is the interference between 1 and 1
  • b is the interference between 2 and 3.
  • the collision of 1 and 1 means collision, which remains intact in subsequent subframes. In other words, the same interference is repeated during the accumulation period so that the effect of interference randomization is lost. This phenomenon is defined as "collision problem" in this document.
  • the above-mentioned dolmen problem can also be solved by PSC based scrambling and segment 1 based scrambling.
  • the neighbor search scenario is as follows.
  • FIG. 6 is a diagram for describing a neighbor search scenario.
  • the UE located at the cell boundary receives the PSCa (Pa) and the SSCa (Sla and Sib) from the cell A, and receives the PSCb (Pb) and the SSCb (S2a and S2b) from the cell B.
  • Eight possible scenarios in this situation can be represented as in Table 3 below.
  • Phase mismatch means a phase mismatch that occurs when the signals from two cells are misaligned (when misaligned). Therefore, it is preferable to design the cell in consideration of the scenario shown in Table 3 above.
  • the cell ID extension / retention method describes a femtocell or a CSG which is discussed in a 3GPP LTE system as a main example.
  • the method according to these embodiments may be used for the extension or reservation of the repeater ID under consideration by a standard body such as LTE-A or IEEE802.16m according to the same principle. That is, in the description of the present invention, the expansion and reservation of the cell ID may be used for identification information for any object, and the femtocell or CSG ID described in each embodiment may be replaced by a relay ID. .
  • the repeater considered in IEEE 802.16j is described, but the same applies to the relay station considered in 3GPP IMT-A (LTE-A).
  • IEEE 2006 IEEE IEEE Institute of Electrical and Electronics Engineers (IEEE) IEEE 802.16, IEEE standard for fixed subscriber stations
  • 802.16-2004 and IEEE 802.16e-2005 a standard standard for providing mobility of subscriber stations
  • 802.16e-2005 a standard standard for providing mobility of subscriber stations
  • the project, which is undertaken by Task Group j within IEEE 802.16, has held its first official meeting in May 2006, and in its second jubilee in July, the Usage Model, terminology and technical requirements.
  • Technical Requirement has begun to discuss in earnest.
  • 802.16 j abbreviated as 802.11 TGj
  • FIG. 7 is a diagram illustrating a structure of a multi-absorption relay system to which a cell ID extension / reservation method according to each embodiment of the present invention can be applied.
  • reference numeral 7 (31 denotes a base station, reference numerals 702a to 702d denote a relay, and reference numerals 703a to 703d denote a terminal), as shown in Fig. 7, an area outside the area of the base station 701.
  • signal transmission through the relay stations 702a and 702b may be possible, and a high level of adaptive modulation and coding through the relay station 702d may be provided to the terminal 703d within the area of the base station 701.
  • the standard that will be created by this project is based on the existing 802.16-2004 and 802.16e-2005 standards. Under the principle that communication with the relay station should be possible, the scope will be limited by addition of some functions for controlling the relay station to the relay station itself and the existing base station. Therefore, specifications for relay stations are expected to be a key issue for future standardization.
  • the relay station can be thought of as a kind of subscriber station that performs the operations of the physical layer and the media access control layer.
  • the relay station is mainly controlled by the base station, but if necessary, it can have some control function.
  • the witness utilization model considers not only fixed relay stations, but also mobile relay stations for temporary services to specific areas, and relay stations that can be mounted in cars or subways.
  • the base station identifies the relay stations in its area and connects them
  • WiFi is by far the most widely used access point for home / business use.
  • WiFi / GSM or WiFi / UMTS Wireless Fidelity
  • UMTS Wireless Fidelity
  • CSG High Node B or femtocell
  • such a UE should be able to identify CSGs that are allowed to access efficiently, and UEs that are not allowed to access CSGs should avoid any measurement with the CSG to prevent unnecessary signaling and power consumption. Do.
  • Embodiments according to the present invention to be described below provide various methods for solving the problems as described above. Hereinafter, the following two aspects will be described based on the provisions of the current 3GPP LTE standard.
  • the first and second aspects of the present invention to be described below are not only the CSG physical cell ID in the 3GPP LTE system, but also the physical cell ID, MBMS indicator, and hot spot indicator (hot spot indicator) used in the IEEE system. -spot indicator) can be applied by the same principle as described above.
  • the cells are classified into CSG cells and macro-cells, and it is assumed that the macro-cells refer to cells that are not CSG cells.
  • a description will be given of a method of setting and retaining a portion of each of them for a CSG cell.
  • one of three currently defined PSCs is reserved as a cell ID for CSG.
  • the complex symmetry characteristics of the PSCs among the indices of 25, 29, and 34 of Table 1 are used. It is proposed to reserve 25 for CSG except 29 and 34 to satisfy the CSG. That is, 29 and 34 satisfy a symmetric relationship with each other based on the generation length 63 of the ZC sequence used for the PSC, and the generated PSCs satisfy a complex symmetric relationship with each other.
  • two PSCs satisfying a complex symmetric relationship are adjusted by only the +/- operation of the intermediate values generated in the correlation value calculation step with one PSC, rather than searching through the correlation with each PSC at the receiving end. Can be detected by one operation.
  • the root index (u) of the ZC sequence constituting the PSC in the current 3GPP LTE system is 25, 29, 34.
  • N zc is ZC sequence generation length
  • Equation 15 N zc . is odd mimber
  • the correlation output for Ul and U2 has a similar amount of calculation as ui one correlation result, and the correlation result for L and U 2 for time synchronization in one operation. Can be calculated.
  • two ZCs satisfying i + u ⁇ Nzc satisfy the complex symmetry relationship or the junction symmetry relationship.
  • ZC which can yield a correlation result between Ul and u 2 in one operation, is called a complex symmetry relationship or a joint symmetry relationship.
  • the junction symmetry of ZC Sieux is not only in the frequency domain but also in the time domain. maintain.
  • the PSS can be transmitted not only in the frequency domain but also in the time domain.
  • Equation 16 the value of the intermediate buffer (intermediate buffer) for calculating the final correlation value is defined as in Equation 16 below.
  • r (n) represents the received signal
  • d represents the delay index
  • I and Q represent the I component (in-phase) and Q component (quadrature-phase) of the complex signal.
  • Equation 17 the final correlation result of and u 2 can be expressed by Equation 17 below.
  • the joint symmetry relationship of the PSS may be maintained not only in the frequency domain but also in the time domain. Therefore, in the present embodiment, when there is a combination that satisfies the predefined PSC complex symmetry characteristic using a feature described above and a combination that does not, the PSC that does not satisfy the complex symmetry characteristic is reserved for the cell ID for CSG. It is proposed to represent a CSG cell using this.
  • 50 IDs reserved for CSG cells are described as an example, but need not be limited to the number, but the interference between CSG cells may be more important than the interference in macro cells. .
  • This embodiment proposes a CSG cell ID reservation method for solving the above-described ambiguity / stratum collision between CSG cells.
  • the present embodiment proposes the following reservation priority so that the above ambiguity problem can be solved only by the cell group ID indicated by the SSS regardless of the PSC.
  • the SSC1 portion is segment 1 and the SSC2 portion is segment 2 in the SSC pairs SSC1 and SSC2.
  • segment 1 based scrambling should be effectively applied to solve the ambiguity problem and the delamination problem.
  • the segment 1 based scrambling should be effectively applied considering the swapping relationship.
  • the total correlation value is reduced to 1/2. For example, suppose two cells use a combination of (0, 1) and (0, 2), respectively. Then, since the same index 0 is used in segment 1, the total correlation is 1/2. When accumulating two SSCs, (0, c (0) * l, 1, c (l) * 0), (0, c (0) * 2, 2, c (2) * 0) This results in a full correlation of 1/4 (ie 00,000 stone). In this case, the correlation value is intuitively increased by increasing 1 when the same index is used. It is calculated.
  • the interference is in the form of (a, b, c, d), and the Hamming distance is 4, so there is no delamination problem.
  • the present embodiment proposes a method of suspending segment 1 based scrambling first and then diagonal pairing first.
  • the receiver swaps i.e., (0, c (0) * l, 1, c (l) * 0), (7, c (7) * 8, 8 c (0) * 7)
  • Hypotheses for 0th or 5th subframe should be performed. That is, assume that the received signal is (0, c (0) * l, l, c (l) * 0), and assume for (7, c (7) * 8,8, c (0) * 7). If you do not have ambiguity and dolb problem.
  • segment 1 based scrambling is a combination that can be applied differently, It is desirable for all indexes in the reserved set to be different.
  • the SSS selects to overlap only once from the viewpoint of Modler for all cross combinations due to the swapping characteristics in each subframe.
  • N ID (1) index 0, 1, 2, 3, 4, 5, 6 in Table 2, followed by indexes 30, 31, 32, 33, 34, 35 of N ID (1) .
  • the example according to the present embodiment proposes to select a combination combination with a difference of 4 between mO and ml, i.e., following (4), index 8 of N ID (1) in Table 2 above.
  • the cell IDs are used as needed in such a manner that the cell group IDs are selected and used in the order in which the distance between the two segments is minimized, while not overlapping as much as possible in consideration of the modular operation.
  • N_d distance between m_0 and n
  • N_d l
  • MatSetCSG [MatSetCSG; nb start + ii nb start + ii + N_d];
  • the MatSetCSG (ie, selected combination) generated by the Matlab algorithm 1 is as follows.
  • 35 cell group IDs can be reserved and can be reserved for a total of 105 CSG cells. If one attempts to reserve less than 105 cell IDs (eg, Nx), Nx of the combinations may be selected and used for CSG cells. For example, to reserve 51 cell IDs, a total of 51 cell IDs can be reserved by selecting 17 cell group IDs and retaining them for CSG cells. By selecting and retaining the number of cell group IDs, a total of 48 cell IDs can be reserved.
  • Mat lab algorithm 1 can be modified as follows.
  • N_d l
  • MatSetCSG [MatSetCSG; nb start + ii n start + ii + N_d]; end% end of for, ii
  • N_d N_d + 1;
  • the set selected according to the Mat lab algorithm 2 is as follows.
  • Segment 1 based scrambling selects different indexes to solve the ambiguity problem. At this time, all selected combinations should be composed of different indexes. The reason for doing this is to solve not only the ambiguity problem but also the ambiguity problem when the mO and ml are swapped.
  • N ID (1) of 0, 2, 4, ..., 28 is selected from the SSC table as shown in Table 2 above.
  • (mO, ml) can be expressed as (0,1) (2,3) (4,5) (6,7) (8,9) (10,11) (12,13) (14,15) (16,17) (18,19) (20,21) (22,23) (24,25) (26,27) (28,29)-> 15
  • the SSC combination may be classified into the following four groups.
  • a cell ID for a CSG cell may be reserved and used by a method combining the above-described embodiments.
  • the SSC pair is extended to a certain level smaller than 465, not up to 465, it should be designed considering the following HeNB cell (CSG cell) characteristics.
  • CSG cell HeNB cell
  • the CSG cell has a small cell coverage (typically tens of meters) and the sector concept. Since it cannot be introduced, it is an important issue to solve the ambiguity or stratification problem for all possible sequence combinations.
  • the basic principle applied to the SSC addition method according to the present embodiment is the same as the principle in the above-described method of using the reserved SSS of the first aspect of the present invention for the CSG cell. If only there is a difference, the cell ID defined as shown in Table 2 is left as it is to be defined to solve the ambiguity and stratification problem for the newly defined cell ID for CSG cells.
  • N_d is the distance between m_0 and n
  • M is the number of segl-based scrambling codes
  • Maxldx 30; % 0 ⁇ 30 because of 31- length m-sequence
  • N_d l + M
  • MatSetCSG [MatSetCSG; nb start + ii m_start + ii + N_d];
  • N_d N_d + l
  • N_d 9 is set to assign m_0 and m_l in a combination different from the cell ID already defined by the modular aspect.
  • the cell group ID combination of ( ⁇ , ml) generated by the Matlab algorithm 3 is as follows.
  • a desired number can be selected within the number of 79 cell group IDs and defined as the ID for the CSG cell. At this time, it is preferable to select the desired number in the order in which they are generated, but in the present embodiment, no constraint is placed thereon.
  • the Mat lab algorithm 3 can be changed as follows.
  • N— d is the distance between m care0 and m_l (distance between m_0 and m_l)
  • N_d l + M
  • MatSetCSG [MatSetCSG; nb start + i i m— start + i i + N_d];
  • a total of 64 cell groups I that is, a total of 192 cell IDs are reserved for CSG cells.
  • one tote index as a PSC index for the CSG cell, and to use the index as the CSG cell indicator.
  • PSC-based scrambling may be applied in consideration of interference between the macro cell and the CSG cell. For example, assuming that a PSC indicating a CSG cell (femtocell) is, the PSC-based scrambling code applied at this time may be defined by changing to Equation 18 or Equation 19 below.
  • the present embodiment proposes a method in which the division between the macro cell and the femtocell (HeNB cell, CSG) is indicated by the time relationship between the SSS and the PSS.
  • HeNB cell, CSG the division between the macro cell and the femtocell
  • the method according to the present embodiment will be described in terms of securing a CSG cell indicator. In general, it may be extended and interpreted as a method of increasing the number of cell IDs.
  • the time relationship between the SSS and the PSS for the FDD (frame structure 1 of the 3GPP LTE system) is as described above with reference to FIGS. 1 and 2, and will be described in more detail in terms of the time relationship therebetween.
  • FIG. 8 is a diagram illustrating a time relationship between an SSS and a PSS in a frame
  • FIG. 9 is a diagram illustrating a method of transmitting additional information by changing a time position between an SSS and a PSS according to an embodiment of the present invention.
  • the last OFDM symbol of the first slot in subframe 0 (symbol 6 in normal CP mode and extended CP mode) PSS at symbol 5) and SSS at the symbol immediately before it. Therefore, in the present embodiment, it is proposed to set the macro cell to indicate that the PSS is transmitted in the slot immediately after the SSS, similarly to the time relationship between the existing PSS and the SSS shown in FIG.
  • the PSS indicates the CSG cell unlike the macro cell when the PSS is ahead of the SSS.
  • the SSS-PSS order may be set to indicate a macro cell
  • the PSS-SSS order may indicate a CSG cell.
  • the UE may distinguish each cell by performing a hypotheses test with respect to the time position where the SSS comes based on the PSS.
  • SSS is transmitted to symbol 5 of subframe 0 and slot 0 and PSS is transmitted to symbol 6 to indicate macro cell ID, and subframe 0 and slot 0 are shown.
  • subframe 0, SSS in symbol 5 and SSC in symbol 5, and PSC in symbol 6 may be transmitted to indicate a macro cell ID, PSC in symbol 6 of subframe 0 and slot 0, and a symbol.
  • the SSS may be transmitted to indicate the CSG cell.
  • the conventional 504 cell IDs may increase to 1008 in total.
  • FIG. 8 depicts a cell other than the CSG cell
  • FIG. 9 illustrates the CSG cell.
  • FIG. 8 may be set such that the CSG cell and FIG. 9 represent other cells than the CSG cell.
  • the PSS and the SSS need not be temporally adjacent OFDM symbols.
  • additional cell IDs can be defined by the relative timing interval or order of PSS and SSS, which can be used as HeNB (CSG, femto) cell ID indicators.
  • the present embodiment proposes to use the cell ID previously defined as it is, but to distinguish the CSG cells by performing the segment 2 based scrambling for the synchronization signal transmitted in the CSG cell.
  • the CSG cell can be indicated by the scrambling method.
  • a method of performing segment 2 based scrambling It is as follows.
  • a PSC-based scrambling code may be defined as follows to indicate a CSG cell.
  • Equations 20 to 22 relate to a method of utilizing a previously defined scrambling code as it is. However, if you are prepared for the additional memory burden, It is also possible to define additional sequences and apply them in the same way.
  • segment 2 based scrambling for CSG may be represented as follows.
  • segment 2 based scrambling sequence It can be defined as follows.
  • ⁇ is defined to be distinct from the previously defined scrambling code, and may be, for example — 8 .
  • a case of separately generating a PSC-based scrambling code for CSG may be represented as follows.
  • the newly defined PSC-based scrambling code may be represented as follows.
  • a method of increasing the number of cell IDs by SS swapping of the main synchronization signal and a method of using a PSS-based scrambling code may be used in combination.
  • a cell ID for a cell other than a CSG is maintained as it is, and a method of additionally defining a cell ID of a CSG cell, that is, an indication of a CSG cell will be described as an example.
  • the form in which the main synchronization signal PSS is transmitted after the sub-synchronization signal SSS is transmitted indicates a general cell, not a CGS cell, After the PSS) is transmitted, it is assumed that the form of the sub-synchronization signal (SSS) (hereinafter referred to as SS + SSS type) indicates a CSG cell.
  • SSS sub-synchronization signal
  • the above-described PSS-based scrambling code for indicating a general cell is defined as 6 up to cyclic shift indexes 0 to 5, and may be transmitted in the form of SSS + PSS.
  • a method of defining six indexes from 6 to 11 as a cyclic shift index for indicating a CSG cell and transmitting them in the form of PSS + SSS can be used.
  • the above-described cyclic shift index is exemplary only and is not necessarily limited to the above-described index.
  • the advantage of using a combination of the synchronization signal swapping method and the PSS-based scrambling code is as follows. Assume a two-cell scenario. As described above, the SSS + PSS type uses the same non-CSG cell, not the CSG cell, and the same assumption that the PSS + SSS type represents the CSG cell.
  • FIG. 10 illustrates a problem that may occur when only the synchronization signal swapping method is used.
  • cell A uses PSS0 and SSS0 and transmits in the form of SSS0 + PSS0.
  • cell B uses PSS1 and SSS1, and transmits the synchronization signal in the form of swapped sync signal, that is, in the form of PSS1 + SSS1 in contrast to cell A.
  • the UE-side receiving end may be received as shown in FIG. 10 due to a timing difference from each cell. That is, when received as shown in FIG. 10, a false alarm combination may be better for PSS1 + SSS0 and SSS1 + PSS0.
  • this problem can be solved by defining and applying additional PSS-based scrambling for CSG cells according to the synchronization signal swapping (hereinafter, this method is referred to as "first option" of the present invention). It can also be seen that the signal swapping method is used in combination with the PSC-based scrambling method shown in Equation (25).
  • Another embodiment of the present invention proposes to apply the PSS scrambling code for the CSG cell in the form of Equation 21 without defining six more PSC-based scrambling codes as in the above-described embodiment. (Hereinafter, such a method is referred to as "second auction 1 " of the present invention).
  • FIG. 11 is a diagram for describing a problem of stratification that may occur when the same PSS-based scrambling code is used for an auxiliary sync signal.
  • cell A transmits in the form of SSS0 + PSS0
  • cell B transmits in the form of PSS0 + SSS0.
  • SSS0 stratification problem may occur as shown in FIG. .
  • 8 segment 1 based scrambling defined in the prior art is applied to a general cell other than a CSG cell that transmits a synchronization signal in SSS + PSS form.
  • the CSG cell that transmits the synchronization signal in the form it is additionally different from the normal cell that is not the CSG cell.
  • We propose a method to further define and use the defined eight segment 1 based scrambling (hereinafter, this method will be referred to as "third junction" of the present invention).
  • the eight segment 1 based scrambling codes additionally defined may be defined in a form in which different circular movements are applied using a polynomial for generating a scrambling code that is conventionally defined and used.
  • the present invention proposes a method used by applying the combined form of Equation 23 and Equation 24, i.e., defining and using segment 2 based scrambling.
  • the fourth option may be used to solve the problems described with reference to FIGS. 10 and / or 11.
  • the first to fourth units described above may be independently used or in various ways.
  • the first junction may be used in combination with the third junction, that is, by additionally defining a segment 1 based scrambling in addition to a swapping scheme of a synchronization signal and PSC based scrambling.
  • the first instruction may be used in combination with the fourth instruction, that is, a swapping method of a synchronization signal, and a PSC.
  • segment 2 based scrambling may be additionally defined and used.
  • the second and third suction units may be used in combination. That is, swapping of the synchronization signal, PSC-based scrambling and segment 1 based scrambling of the modified form as shown in Equation 21 may be additionally defined and used. Also said The second option may be used in combination with the fourth option. That is, a method of distinguishing using segment 2 based scrambling together with synchronization signal swapping and modified PSC commercial scrambling is also applicable.
  • a method of indicating an indicator indicating an ID of a CSG cell or the like through phase rotation of a synchronization signal is proposed.
  • a macro-cell referred to as a macro-cell in the description of the present invention for convenience and may be referred to as a non-CSG cell
  • the code combination is represented by (SSC1, SSC2)
  • the indicators can be distinguished from the 0th subframe and the 5th subframe as follows.
  • the scrambling application is omitted for convenience of description.
  • each cell can be distinguished through phase modulation performed by using (1, 1) for the macro cell and (-1, -1) for the CSG.
  • each cell can be distinguished through phase modulation performed by using (1, 1) for the macro cell and (1, -1) for the CSG.
  • the present embodiment appreciates that additional information can be transmitted using phase modulation of the SSC, and proposes to represent a CSG cell using the phase modulation, and according to the amount of additional information, the BPSK and QPSK schemes are used. Phase modulation can be performed. In addition, even in the BPSK scheme, four pieces of information may be additionally transmitted according to a combination of phase modulation applied to SSC1 and SSC2.
  • the method according to the disclosed embodiments may further allocate a physical layer ID to distinguish a CSG cell in a 3GPP LTE system, or reserve a part of an existing physical layer cell ID to utilize a CSG cell. Applicable to the scheme.
  • the allocation of the physical cell ID for the additional target may be applied to various systems as well as the 3GPP LTE system, and the additional target may be a MBMS ID, a hot-spot indicator, as well as a target such as a relay of the IEEE system. And so on.

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Abstract

L'invention concerne un procédé de transmission d'ID de cellule d'un type spécifique comme des informations d'ID de couche physique en plus d'informations d'ID de cellule existantes. A cet effet, un procédé peut être utilisé pour augmenter le nombre d'ID de cellule utilisés dans la transmission d'informations d'ID de cellule existantes dans un canal de synchronisation, et une partie d'ID de cellule existantes peut être définie pour être utilisée pour la transmission d'informations d'ID de cellule d'un type spécifique supplémentaire. Plus spécifiquement, en cas d'augmentation du nombre d'ID de cellule, un procédé d'augmentation du nombre de groupes d'ID de cellule associés à un canal de synchronisation secondaire sans problèmes d'ambiguïté ni problèmes de collision, un procédé d'addition du nombre d'ID de cellule associé à un canal de synchronisation principal de manière à satisfaire des caractéristiques de symétrie complexe, un procédé de transmission d'informations à l'aide d'une relation de synchronisation de transmission d'un code de synchronisation principal et d'un code de synchronisation secondaire, et un procédé de transformation d'un système d'embrouillage peuvent être utilisés. En outre, en cas de réservation d'une partie d'ID de cellule existants, des caractéristiques de symétrie complexe sont considérées en relation avec un canal de synchronisation principal, et des problèmes d'ambiguïté et de collision sont considérés en relation avec un canal de synchronisation secondaire.
PCT/KR2009/003270 2008-04-03 2009-06-18 Procédé de transmission d'informations d'id de couche physique WO2009154410A2 (fr)

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CN102792762A (zh) * 2010-03-16 2012-11-21 索尼公司 中继站和通信控制方法

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CN102209377A (zh) * 2010-03-31 2011-10-05 中兴通讯股份有限公司 辅同步信号的生成方法和装置
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