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WO2011006418A1 - Procede et appareil de mappage de signal de synchronisation sur une liaison de relais - Google Patents

Procede et appareil de mappage de signal de synchronisation sur une liaison de relais Download PDF

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Publication number
WO2011006418A1
WO2011006418A1 PCT/CN2010/074428 CN2010074428W WO2011006418A1 WO 2011006418 A1 WO2011006418 A1 WO 2011006418A1 CN 2010074428 W CN2010074428 W CN 2010074428W WO 2011006418 A1 WO2011006418 A1 WO 2011006418A1
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WIPO (PCT)
Prior art keywords
synchronization signal
sequence
mapping
synchronization
frequency
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PCT/CN2010/074428
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English (en)
Chinese (zh)
Inventor
毕峰
杨瑾
梁枫
袁明
吴栓栓
袁弋非
Original Assignee
中兴通讯股份有限公司
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Publication of WO2011006418A1 publication Critical patent/WO2011006418A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/0055—Synchronisation arrangements determining timing error of reception due to propagation delay
    • H04W56/0065—Synchronisation arrangements determining timing error of reception due to propagation delay using measurement of signal travel time
    • H04W56/007—Open loop measurement
    • H04W56/0075—Open loop measurement based on arrival time vs. expected arrival time
    • H04W56/0085—Open loop measurement based on arrival time vs. expected arrival time detecting a given structure in the signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0069—Cell search, i.e. determining cell identity [cell-ID]
    • H04J11/0073—Acquisition of primary synchronisation channel, e.g. detection of cell-ID within cell-ID group
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0069—Cell search, i.e. determining cell identity [cell-ID]
    • H04J11/0076—Acquisition of secondary synchronisation channel, e.g. detection of cell-ID group
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2603—Arrangements for wireless physical layer control
    • H04B7/2606—Arrangements for base station coverage control, e.g. by using relays in tunnels

Definitions

  • the present invention relates to a synchronization signal mapping technique, and more particularly to a synchronization signal mapping method and apparatus for a relay link. Background technique
  • LTE Long Term Evolution
  • LTE-A Advanced Long Term Evolution Advanced
  • IMT-Advanced International Mobile Telecommunication Advanced
  • Figure 1 is a schematic diagram of the relationship between resource blocks and subcarriers. As shown in Figure 1, all the small squares represent one resource block, and the shaded small squares represent subcarriers.
  • a resource block is defined as an OFDM symbol within one slot in the time domain, and 12 or 24 subcarriers in the frequency domain, so 1
  • the RBs are composed of ⁇ ⁇ ⁇ ⁇ resource elements (RE, Resource Element ), where ⁇ represents the number of OFDM symbols in one slot, and ⁇ represents the number of consecutive subcarriers in the frequency domain of the resource block.
  • RE Resource Element
  • PCID Physical-layer Cell Identity
  • the synchronization signal contains the primary synchronization signal (PSS, Primary Synchronization Signal) And secondary synchronization Signal (SSS, Secondary Synchronization Signal), the period of the synchronization signal is 5ms, PSS and SSS are transmitted on the same antenna; PSS is composed of frequency domain Zadoff-Chu sequence and carries ⁇ ), and SSS is composed of binary sequences.
  • Table 1 is the mapping relationship of PSS.
  • n is the numerical index in the sequence
  • k is the subcarrier index
  • 1 is the OFDM symbol index
  • «) is the synchronization sequence, indicating the synchronization sequence mapping.
  • Frequency position N represents the number of downlink resource blocks
  • N s represents the number of subcarriers in the frequency direction of one resource block.
  • Table 2 shows the mapping relationship of SSS.
  • n is the numerical index in the sequence
  • k is the subcarrier index
  • 1 is the OFDM symbol index
  • «) indicates the synchronization sequence, indicating the time-frequency position of the synchronization sequence mapping
  • N indicates the downlink resource.
  • the number of blocks, N s represents the number of subcarriers in the frequency direction of a resource block.
  • B3G/4G The research goal of B3G/4G is to integrate access systems such as cellular, fixed wireless access, nomadic, wireless regional networks, and all-IP networks to provide users with peaks in high-speed and low-speed mobile environments. Value-rates up to 100Mbps and IGbps wireless transmission capabilities, and the seamless integration of cellular systems, regional wireless networks, broadcast, and television satellite communications, enabling humans to implement any way, anytime, anywhere with anyone else. Communication.
  • the relay technology can be used as an effective measure, so that the relay node (RN, Relay Node) can increase the coverage of the cell and increase the cell capacity.
  • FIG. 2 is a schematic structural diagram of a relay node introduced in the system. As shown in FIG. 2, a new link is added after the RN is introduced in the system, and the link between the evolved base station eNode-B and the RN is called a backhaul link.
  • the link between the eNode-B and the UE is called the access link.
  • the link between the eNode-B and the UE is called the link.
  • the link between the eNode-B and the UE is called the link.
  • Direct link is a new link is added after the RN is introduced in the system, and the link between the evolved base station eNode-B and the RN is called a backhaul link.
  • the link between the eNode-B and the UE is called the access link.
  • the link between the eNode-B and the UE is called the link.
  • the link between the eNode-B and the UE is called the link. Direct link.
  • the backhaul link between the eNB and the RN and the access link between the RN and the UE operate on the same frequency resource. Because the in-band relay transmitter can interfere with its own receiver (called self-interference), it is impossible for the eNB to RN link and the RN to UE link to be on the same frequency resource at the same time unless there is enough signal separation. And antenna isolation. Similarly, it is also impossible for the RN to transmit data to the eNB while receiving data transmitted by the UE.
  • FIG. 3 is a schematic diagram of the composition of a radio frame in an LTE system.
  • a small square represented by a snowflake dot shadow is a radio frame (frame)
  • a small square represented by a left oblique line shadow is a sub-frame.
  • a 10ms frame is composed of 10 1ms subframes (represented by #0 to #9), and may include unicast (Unicast) and multicast broadcast (Multicast Broadcast) behalf
  • FDD Frequency Division Duplex
  • #0, #5 subframes are used as transmission synchronization signals
  • #4, #9 subframes are used as paging
  • TDD Time Division Duplex
  • #0, #5 subframes are used as the transmission synchronization signal
  • #1, #6 subframes are used as paging.
  • MBSFN Multicast Broadcast Single Frequency Network
  • a possible implementation method is that when the RN receives the data from the eNB, the UE does not perform the transmission operation, that is, after the RN reaches the UE link, a gap is required, and the MBSFN is configured.
  • the subframe is used for the RN subframe, so that the UE does not perform any receiving/transmitting operation in the ga time range, and the RN completes the transmission-to-receive switching in the gap time range, and receives the data from the eNB in the subsequent OFDM symbol after the handover is completed.
  • the MBSFN subframe is used for the RN subframe.
  • the MCE MBMS Control Entity
  • the MCE first configures the eNB with the available MBSFN subframe, and the eNB is in the available MBSFN subframe. Configure the available RN subframes. Therefore, in downlink, the RN first transmits control information to the UEs of its subordinates in the first 1 or 2 OFDM symbols, including feedback information (ACK/NACK, Acknowlegment/Negative Acknowlegment) and uplink grant (UL grant) information of the uplink transmission data. .
  • feedback information ACK/NACK, Acknowlegment/Negative Acknowlegment
  • UL grant uplink grant
  • FDD ⁇ #0, #4, #5, #9 ⁇ subframes, TDD ⁇ #0, #1, #5, #6 ⁇ subframes have the above special purposes, so they cannot be used.
  • Multicast broadcasts the allocation of MBSFN subframes for single frequency networks, while PSS/SSS is transmitted at #0, #1, #5, #6 subframe as described above, and #0, #1, #5, #6 subframe cannot be used as The backhaul subframe, which inevitably causes the RN that is in the working state cannot receive the PSS and SSS delivered by the eNode-B.
  • the cell search is based on PSS, SSS, and reference signal (RS, Reference Signal), and the PCID is obtained through the process for subsequent work, because the synchronization signal is the first check when the UE performs cell search.
  • the measured signal, for the UE, the synchronization signal can synchronize the time and frequency, and the role of the PCID.
  • the synchronization signal is only used for UE tracking. Considering the accuracy of sending and receiving dual-issue clocks, there will be such deviations between the transmitting and receiving parties, which will cause the two parties to lose synchronization. If the RN works according to the eNode-B clock accuracy, the RN needs to perform synchronization tracking every 300ms; if the RN follows the UE clock Precision works, about every 5ms, the RN needs to track synchronously.
  • the RN does not distinguish from the normal terminal when performing cell search, and the selection of the RN clock precision should use the clock precision similar to that of the base station, so the RN only needs to track in the normal working state. Whether it is in the out-of-synchronization state, and the synchronization tracking can only be performed by the PSS periodically transmitted.
  • the PSS on the backhaul link is called the R-PSS (RN Link-Primary Synchronization Signal) or A synchronization signal called a relay link (R-SS, RN link-Synchronization Signal)
  • the main object of the present invention is to provide a synchronization signal mapping method and apparatus for a relay link, which can implement a specific synchronization signal mapping mode of a backhaul link from a base station to a relay node.
  • a synchronization signal mapping method for a relay link comprising:
  • mapping position of the synchronization signal composed of the generated synchronization sequence in the frequency direction is determined, and the mapping position of the synchronization signal composed of the generated synchronization sequence in the time direction is determined.
  • the generating a synchronization sequence includes: the synchronization signal is composed of a frequency domain Zadoff-Chu sequence,
  • the root sequence index of the Zadoff-Chu sequence corresponds to ⁇ , where ⁇ represents the physical cell identity PCID within the group.
  • the generating a synchronization sequence includes: the synchronization signal is composed of a time domain Zadoff-Chu sequence, The root sequence index of the Zadoff-Chu sequence "corresponds to N m , or the root sequence index of the Zadoff-Chu sequence" has no relationship, and represents the physical cell identifier PCID within the group.
  • the generating the synchronization sequence includes: the synchronization signal is composed of a frequency domain zero correlation window sequence Zero Correlation Zone sequence, and the code of the Zero Correlation Zone sequence is only the Code ID index and the corresponding code ID of the Zero Correlation Zone sequence.
  • the index has no relationship, where ⁇ represents the physical cell identifier PCID in the group.
  • the generating the synchronization sequence includes: the synchronization signal is composed of a time domain Zero Correlation Zone sequence, and the Code ID index of the Zero Correlation Zone sequence corresponds to, or
  • the Code ID index of the Correlation Zone sequence has no relationship, which indicates the physical cell ID PCID in the group.
  • the method further includes:
  • the method further includes:
  • the information is public information specific to the relay node.
  • the Zadoff-Chu sequence O is as follows: d (n) e H ' ⁇ 0 ' 1 '- 0 where n is the numerical index within the sequence
  • the correspondence is 25 and 0, 29 and 1, 34 and 2.
  • the determining a mapping position of the synchronization signal in a frequency direction includes:
  • the synchronization signal is mapped at a frequency position of 540 kHz symmetrically about the center bandwidth, and the leftmost and rightmost 5 carriers among the 72 subcarriers do not carry any data as guard subcarriers.
  • the determining a mapping position of the synchronization signal in a frequency direction includes:
  • the synchronization signal is mapped at a frequency position of (m/2)*180 kHz around the center bandwidth, where (m/2)*180 kHz represents the frequency width of the m/2 resource blocks RB, and a total of m RBs Frequency Rate width, ie m*180kHz, where m is a positive integer.
  • the determining a mapping position of the synchronization signal in a frequency direction includes:
  • the synchronization signal is mapped to a frequency position of a total of m RBs at a frequency position that is not symmetric with the center bandwidth, that is, m*180 kHz, where m is a positive integer, and the frequency position that is not symmetric with the center bandwidth may be fixed, or It can be not fixed.
  • the determining a mapping position of the synchronization signal in a time direction includes:
  • the subframe of the synchronization signal mapping of the base station to the relay node link satisfies:
  • R-PSS-SFe ⁇ R ⁇ I SFN mod ⁇ ⁇ , where R - PSS - SF represents the subframe in which the synchronization signal is located, RF represents the radio frame in which the synchronization signal is located, SFN is the system frame number, and n represents the base station The radio frame period of the synchronization signal mapping to the relay node link and n is a positive integer; mod represents the remainder operation.
  • the R-PSS-SF is a common backhaul link subframe of all relay nodes, or a non-public backhaul link subframe.
  • the determining a mapping position of the synchronization signal in a time direction includes:
  • the synchronization signal maps the first to the first time slot of the R-PSS-SF Within OFDM;
  • the synchronization signal is mapped within the first OFDM of the first time slot of the R-PSS-SF;
  • the synchronization signal is mapped within the first OFDM of the second time slot of the R-PSS-SF, or is mapped within the third OFDM of the R-PSS-SF.
  • a synchronization signal mapping apparatus for a relay link comprising: a synchronization sequence generation module, a first mapping module, and a second mapping module, where
  • a synchronization sequence generation module configured to generate a synchronization sequence of a backhaul link between a base station and a relay node a column, and outputting the generated synchronization sequence to the first mapping module and the second mapping module;
  • the first mapping module is configured to determine a mapping position of the synchronization signal formed by the generated synchronization sequence in the frequency direction;
  • a second mapping module configured to determine a mapping position of the synchronization signal formed by the generated synchronization sequence in the time direction.
  • the solution of the present invention realizes the backhaul link of the base station to the relay node by generating the synchronization sequence and determining the mapping position of the synchronization signal in the frequency direction and the time direction.
  • Synchronous signal mapping method The method of the present invention is well-suited for the backhaul link between the base station and the relay node, and the synchronization signal mapping mode is simple, which not only ensures backward compatibility (compatible with the LTE system), but also solves the problem that the relay node correctly receives the data from the base station.
  • the problem of PSS and SSS is to use low overhead, and at the same time ensure that the relay node completes the tracking work normally.
  • 1 is a schematic diagram showing the relationship between resource blocks and subcarriers
  • FIG. 2 is a schematic structural diagram of introducing a relay node in the system
  • FIG. 3 is a schematic diagram of a composition of a radio frame in an LTE system
  • FIG. 4 is a flowchart of a synchronization signal mapping method of a relay link according to the present invention.
  • FIG. 5 is a schematic structural diagram of a synchronization signal mapping apparatus of a relay link according to the present invention
  • FIG. 6 is a schematic diagram of an embodiment of an R-PSS with a period of 32 radio frames
  • FIG. 7 is a schematic diagram of an embodiment of a R-PSS with 64 radio frames as a period, and a common backhaul link subframe carrying an R-PSS;
  • FIG. 8 is a schematic diagram of an embodiment of a R-PSS with 64 radio frames as a period, and a non-common backhaul link subframe carrying R-PSS;
  • 9 is a schematic diagram of an embodiment of FDD and TDD systems using different OFDM symbols to carry R-PSS, with a frequency width of 6 RBs at a frequency position symmetric with respect to the center bandwidth;
  • 10 is a schematic diagram of an embodiment in which the FDD and TDD systems use the same OFDM symbol to carry R-PSS, and the frequency width of a total of 6 RBs at a frequency position symmetric with respect to the center bandwidth;
  • Figure 11 is a diagram showing an embodiment in which the FDD and TDD systems use the same OFDM symbol to carry R-PSS, and the frequency width of a total of 3 RBs at a frequency position that is not symmetric with the center bandwidth.
  • FIG. 4 is a flowchart of a method for mapping a synchronization signal of a relay link according to the present invention. As shown in FIG. 4, the method includes the following steps:
  • Step 400 Generate a synchronization sequence of the backhaul link between the base station and the relay node.
  • the synchronization sequence generation method of the base station to the relay node link is the same as or different from the primary synchronization sequence generation method of the base station to the terminal link. Specifically:
  • the synchronization signal is composed of a frequency domain Zadoff-Chu sequence.
  • the root sequence index of the Zadoff-Chu sequence corresponds to ⁇ .
  • ⁇ ⁇ represents the PCID in the group, taking the LTE system as an example, the value ranges from 0 to 2; represents the PCID group, and the LTE system takes values from 0 to 167. .
  • the synchronization signal is composed of a time domain Zadoff-Chu sequence, and the root sequence index of the Zadoff-Chu sequence is not related to or corresponding to;
  • the synchronization signal is composed of a frequency domain Zero Correlation Zone sequence (also referred to as a zero correlation window sequence, or a zero correlation region sequence), and the Code ID index of the Zero Correlation Zone sequence has no relationship with or corresponding to ⁇ ⁇ ;
  • the synchronization signal consists of a sequence of time i or Zero Correlation Zone, and the Code ID index of the Zero Correlation Zone sequence has no relationship with the corresponding or the relationship.
  • different synchronization signals may be carried by the base station to the relay node link, and the information may be public information specific to the relay node, such as backhaul link subframe configuration information, or Backhaul link subframe configuration change information, etc.
  • the cell-related information such as the PCID has been acquired; and for the synchronization tracking of the base station to the relay node link, the synchronization signal and the base station to the end are selected at this time.
  • the synchronization signal at the 10th end can be different. It can also be understood as:
  • the synchronization signal has no relationship with ⁇ ⁇ at this time. That is to say, the current synchronization sequence can also carry the common information unique to the relay node, and of course can also carry the cell information. Can not carry any information.
  • the Zadoff-Chu sequence d u (n) is as shown in the formula (1):
  • ⁇ is an intra-sequence numerical index.
  • Zadoff-Chu root sequence index of the sequence [mu] is obtained from Table 3 and Table 3 is a root sequence index (Root index) "and ⁇ 3 ⁇ 4) correspondence.
  • the R-PSS consists of a frequency domain or a time domain Zero Correlation Zone sequence, taking the LTE LTE-A system as an example, the Zero Correlation Zone sequence F n is as shown in equation ( 4 ). winter
  • the sequence F 1 is generated from the base sequence by an iterative method, as shown in equation (3):
  • Table 4 shows the correspondence between the Code ID index and .
  • Step 401 Determine a mapping position of the synchronization signal composed of the generated synchronization sequence in the frequency direction.
  • the mapping position of the synchronization signal of the base station to the relay node in the frequency direction is the same as or different from the mapping position of the primary synchronization signal of the base station to the terminal link in the frequency direction.
  • mapping position of the synchronization signal of the base station to the relay node in the frequency direction is the same as the mapping position of the primary synchronization signal of the base station to the terminal link in the frequency direction
  • the specific implementation is as follows: mapping is symmetrical at a frequency of 540 kHz around the center bandwidth In position (i.e., a total frequency of 1.08 MHz, a total of 72 subcarriers), and the leftmost and rightmost 5 carriers among the 72 subcarriers do not carry any data as guard subcarriers.
  • mapping position of the synchronization signal of the base station to the relay node link in the frequency direction is different from the mapping position of the primary synchronization signal of the base station to the terminal link in the frequency direction
  • specific implementation is:
  • the mapping is at a frequency position of (m/2)*180 kHz around the center bandwidth, where (111/2)*1801 ⁇ 3 ⁇ 4 represents the frequency width of 1 ⁇ 2 RBs, and the frequency width of a total of m RBs, that is, m * 180kHz, where m is a positive integer;
  • mapping the frequency width of a total of m RBs at a frequency position that is not symmetric with the center bandwidth That is, m*180 kHz, where m is a positive integer, and the frequency position that is not symmetric with the center bandwidth may be fixed, or may not be fixed.
  • Step 402 Determine a mapping position of the synchronization signal formed by the generated synchronization sequence in the time direction.
  • the synchronization signal of the base station to the relay node link is mapped in the time direction specifically including the mapping on the radio frame, the subframe, and the OFDM symbol.
  • the subframe of the synchronization signal mapping of the base station to the relay node link is different from the subframe of the primary synchronization signal mapped by the base station to the terminal link, and the subframe of the synchronization signal mapping of the base station to the relay node link is satisfied.
  • R-PSS-SF indicates a subframe in which the R-PSS is located
  • RF indicates a radio frame in which the R-PSS is located
  • SFN indicates a system frame number
  • n indicates a synchronization signal mapping of the base station to the relay node link.
  • Radio frame period, and n is a positive integer; mod represents a remainder operation.
  • the R-PSS-SF may select a common backhaul subframe (backhaul subframe) at all relay nodes or select a non-common backhaul link subframe, that is, select the first one in the relay node. One or the last one or any one of the backhaul link subframes.
  • backhaul subframe backhaul subframe
  • the mapping of the synchronization signal of the base station to the relay node link on the OFDM symbol comprises: when the FDD and TDD systems use the same OFDM symbol position, preferably, the synchronization signal of the base station to the relay node link is mapped in the R-PSS- The first count of the first slot in the SF is within the first OFDM.
  • the synchronization signal of the base station to the relay node link is mapped within the first OFDM of the first slot of the R-PSS-SF;
  • the synchronization signal of the base-to-relay node link is mapped in the first OFDM of the second slot in the R-PSS-, or the synchronization signal of the TDD system-to-relay node link is mapped in the R - PSS - in the third OFDM.
  • the method of the present invention is well applicable to a backhaul link between a base station and a relay node, and the synchronization signal mapping mode is simple, which not only ensures backward compatibility (compatible with the LTE system), but also The problem that the relay node correctly receives the PSS and SSS sent by the base station is solved, and the low overhead is used, and the relay node is normally completed to complete the tracking work.
  • the method includes a synchronization sequence generation module, a first mapping module, and a second mapping module, where the synchronization sequence generation module is configured to Generating a synchronization sequence of the backhaul link between the base station and the relay node, and outputting the generated synchronization sequence to the first mapping module and the second mapping module.
  • the first mapping module is configured to determine a mapping position of the synchronization signal formed by the generated synchronization sequence in the frequency direction.
  • FIG. 6 is a schematic diagram of an embodiment of an R-PSS with a period of 32 radio frames.
  • an R-PSS is transmitted by using 32 radio frames as an example.
  • the base station transmits R-PSS in the radio frame of ⁇ RF
  • W mod 32 0 ⁇ , such as #0, #32, #64, #96 (not shown in Figure 6), as shown in Figure 6
  • the small shaded cells represent the radio frames carrying the R-PSS.
  • RF indicates the radio frame where the R-PSS is located, and SFN indicates the system frame number.
  • FIG. 7 is a schematic diagram of an R-PSS with a 64-radio frame period, and a common backhaul link subframe carrying an R-PSS.
  • 64 radio frames are used for transmission.
  • ⁇ wm. d 64 0 ⁇
  • the R-PSS is also transmitted in the radio frame, as shown in Figure 7 in the dark shaded small square table.
  • a radio frame carrying R-PSS is shown. Where RF represents the radio frame where the R-PSS is located, and SFN represents the system frame number.
  • the dark squared diagonally shaded small squares in Fig. 7 represent the subframes carrying the R-PSS.
  • FIG. 8 is a schematic diagram of an R-PSS with a 64-radio frame period, and a non-common back-link link subframe carrying an R-PSS.
  • 64 radio frames are used as a cycle.
  • the R-PSS is transmitted, and the R-PSS is carried by a non-common backhaul link subframe.
  • the base station is in a ⁇ RF
  • ⁇ V mod 64 0 ⁇ radio frame, such as #0, #64, #128, #192 (not shown in Fig. 8)
  • the radio frame also transmits R-PSS, and the dark shaded small square in Fig. 8 indicates the radio frame carrying the R-PSS.
  • RF indicates the radio frame where the R-PSS is located and SFN indicates the system frame number.
  • the subframe that specifically carries the R-PSS is selected in a non-common backhaul link subframe, for example, the base station transmits in the #2 or #8 subframe of the ⁇ R
  • ⁇ 7v mod 64 0 ⁇ radio frame.
  • R-PSS as shown in Figure 8, the dark left slash shaded small squares represent the sub-frames carrying the R-PSS. These R-PSSs are used for RN for simultaneous tracking and can further carry information.
  • FIG. 9 is a schematic diagram of an embodiment in which the FDD and the TDD system use different OFDM symbols to carry R-PSS, and the frequency width of a total of 6 RBs at a frequency position symmetric with respect to the center bandwidth.
  • this embodiment uses FDD.
  • the TDD system uses a different OFDM symbol to carry the R-PSS as an example.
  • the shaded portion in FIG. 9 indicates that the R-PSS is carried, the abscissa direction represents the time domain, and the ordinate direction represents the frequency domain.
  • the synchronization signal of the base station to the relay node link is mapped in the first OFDM of the first slot in the R-PSS-SF; for the TDD system, the base station to the relay node link
  • the synchronization signal is mapped in the first OFDM of the second Slot in R - PSS - or in the R - PSS - Within 3 OFDM; the frequency direction maps over a frequency width of 6 RBs at a frequency position symmetrical at the center bandwidth.
  • FIG. 10 is a schematic diagram of an embodiment in which the FDD and the TDD system use the same OFDM symbol to carry the R-PSS, and the frequency width of a total of 6 RBs at a frequency position symmetric with the center bandwidth.
  • the present embodiment uses FDD.
  • the same OFDM symbol bearer R-PSS is used as the TDD system.
  • the shaded portion in Figure 10 represents the bearer R-PSS, the abscissa direction represents the time domain, and the ordinate direction represents the frequency domain.
  • the synchronization signal of the base station to the relay node link is mapped in the first OFDM of the first slot of the R-PSS -; the frequency direction mapping is 6 RBs at a frequency position symmetric with the center bandwidth.
  • the frequency width is 6 RBs at a frequency position symmetric with the center bandwidth.
  • FIG. 11 is a schematic diagram of an embodiment in which the FDD and the TDD system use the same OFDM symbol to carry the R-PSS, and the frequency width of a total of 3 RBs at a frequency position that is not symmetric with the center bandwidth.
  • this embodiment uses The FDD and TDD systems use the same OFDM symbol to carry the R-PSS as an example.
  • the shaded portion in Figure 11 represents the bearer R-PSS, the abscissa direction represents the time domain, and the ordinate direction represents the frequency domain.
  • the synchronization signal of the base station to the relay node link is mapped in the first OFDM of the first slot of the R-PSS -; the frequency direction maps a total of three RBs at a frequency position that is not symmetric with the center bandwidth. (3 small squares shown in the shaded area in the figure) on the frequency width.

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  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé et un appareil permettant de mapper un signal de synchronisation sur une liaison de relais. En générant une séquence de synchronisation, et en déterminant les positions de mappage, dans la direction de fréquence et la direction temporelle, du signal de synchronisation, on met en oeuvre le mode de mappage du signal de synchronisation sur une liaison terrestre entre une station de base (BS) et un noeud de relais (RN). Le procédé selon l'invention peut parfaitement être adapté à une liaison terrestre entre une BS et un RN et le mode de mappage du signal de synchronisation est simple, ce qui non seulement garantit une rétrocompatibilité (soit compatible avec un système à évolution à long terme (LTE)),mais également permet de résoudre le problème, à savoir comment le RN peut correctement recevoir un signal de synchronisation primaire (PSS) et un signal de synchronisation secondaire (SSS) émis par la BS, dont le coût est bas, mais qui garantit que le RN peut normalement achever le suivi du travail.
PCT/CN2010/074428 2009-07-13 2010-06-24 Procede et appareil de mappage de signal de synchronisation sur une liaison de relais WO2011006418A1 (fr)

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CN103491041B (zh) * 2012-06-13 2017-04-12 华为技术有限公司 同步方法及基站、终端
CN105409300A (zh) * 2013-03-19 2016-03-16 爱立信(中国)通信有限公司 在虚拟专用网中提供分组同步
EP2941066B1 (fr) * 2013-04-07 2019-06-12 Huawei Technologies Co., Ltd. Procédé et appareil d'émission d'un signal commun
WO2015139249A1 (fr) * 2014-03-19 2015-09-24 华为技术有限公司 Procédé et appareil destinés à envoyer un signal utilisé pour une synchronisation
CN106465310B (zh) * 2014-04-14 2020-12-25 创新技术实验室株式会社 用于在无线通信系统中传输用于设备到设备通信的同步信号的方法和装置
US10285144B2 (en) * 2015-11-05 2019-05-07 Qualcomm Incorporated Clean-slate synchronization signal design and cell search algorithms
CN110149642B (zh) 2018-02-12 2021-12-10 华为技术有限公司 一种中继节点同步信号的发送方法及装置

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