US20180279257A1 - System message transmission method and device - Google Patents

System message transmission method and device Download PDF

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Publication number
US20180279257A1
US20180279257A1 US15/757,152 US201615757152A US2018279257A1 US 20180279257 A1 US20180279257 A1 US 20180279257A1 US 201615757152 A US201615757152 A US 201615757152A US 2018279257 A1 US2018279257 A1 US 2018279257A1
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Prior art keywords
subframe
ofdm symbols
pbch
slot
system message
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US15/757,152
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English (en)
Inventor
Bo Dai
Shuqiang Xia
Guanghui Yu
Liujun Hu
Yifei Yuan
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ZTE Corp
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ZTE Corp
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Priority claimed from PCT/CN2016/097379 external-priority patent/WO2017036385A1/zh
Assigned to ZTE CORPORATION reassignment ZTE CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HU, LIUJUN, YU, GUANGHUI, XIA, SHUQIANG, YUAN, YIFEI, DAI, BO
Publication of US20180279257A1 publication Critical patent/US20180279257A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0023—Interference mitigation or co-ordination
    • H04J11/005—Interference mitigation or co-ordination of intercell interference
    • H04J11/0056—Inter-base station aspects
    • H04W72/005—
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/30—Resource management for broadcast services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/08—Load balancing or load distribution
    • 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
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT
    • 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
    • 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
    • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/10—Access restriction or access information delivery, e.g. discovery data delivery using broadcasted information
    • H04W72/082—
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/52—Allocation or scheduling criteria for wireless resources based on load
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J2211/00—Orthogonal indexing scheme relating to orthogonal multiplex systems
    • H04J2211/003—Orthogonal indexing scheme relating to orthogonal multiplex systems within particular systems or standards
    • H04J2211/005—Long term evolution [LTE]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14—Spectrum sharing arrangements between different networks

Definitions

  • the disclosure relates to, but is not limited to, the field of wireless communications, and more particularly to a system message transmission method and device.
  • MTC Machine Type Communication
  • M2M Machine to Machine
  • 3GPP 3rd Generation Partnership Project
  • TR45.820V200 3rd Generation Partnership Project
  • NB-LTE Narrowband Long Term Evolution
  • the system bandwidth of an NB-LTE system is 200 kHz, identical to the channel bandwidth of a Global System for Mobile Communication (GSM), which brings great convenience for reusing a GSM spectrum by an NB-LTE system and reducing mutual interference between a neighbor channel and a GSM channel.
  • GSM Global System for Mobile Communication
  • the transmission bandwidth of the NB-LTE and a downlink subcarrier interval are 180 kHz and 15 kHz respectively, identical to the bandwidth and subcarrier interval of one Physical Resource Block (PRB) of an LTE system respectively. This not only facilitates reuse of relevant designs of the relevant LTE system in the NB-LTE system, but also reduces mutual interference between the two systems when a GSP spectrum reused by the NB-LTE system is adjacent to a spectrum of the LTE system.
  • PRB Physical Resource Block
  • a subcarrier interval of the relevant LTE system is 15 kHz.
  • the LTE system supports the following six system bandwidths, i.e., 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz and 20 MHz, and these six bandwidths respectively have 72, 150, 300, 600, 900 and 1200 available subcarriers.
  • the transmission bandwidth and downlink subcarrier interval of the NB-LTE system are the same as the bandwidth and subcarrier interval of one PRB of the LTE system respectively, the NB-LTE system and the LTE system may coexist in the same spectrum.
  • a bandwidth of 180 kHz may be allocated for sending an NB-LTE system signal.
  • an effective solution for ensuring that NB-LTE system and LTE system signals are not transmitted over the same resource so as to reduce mutual interference between the two systems is not provided yet at present.
  • Some embodiments of the disclosure provide a system message transmission method and device, which may reduce the interference between signals during spectrum sharing between different systems, and reduce the occurrence of simultaneous transmission of different signals over the same resource by different systems.
  • a system message transmission method may include the steps as follows.
  • a system message may be transmitted at a preset resource location.
  • a physical downlink channel may be transmitted according to the system message.
  • the system message may include at least one of: frequency domain location information of a system, configuration information of a physical shared channel carrying a system message, configuration information of terminal access, available resource information of the physical downlink channel, and radio frame information.
  • the available resource information of the physical downlink channel may include: information of a start Orthogonal Frequency Division Multiplexing (OFDM) symbol of the physical downlink channel in a subframe, and/or information of one or more unavailable resource elements of the physical downlink channel in a subframe, and/or information of one or more available subframes of the physical downlink channel.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the method may further include a step of indicating the information of the one or more unavailable resource elements via a Cell-specific Reference Signal (CRS) port location and/or a Channel State Information Reference Signal (CSI-RS) port location.
  • CRS Cell-specific Reference Signal
  • CSI-RS Channel State Information Reference Signal
  • the indication via the CRS port location and/or the CSI-RS port location may be determined by a number of ports and/or a virtual cell identity.
  • system message may be transmitted at the preset resource location in a following manner.
  • the system message may be transmitted at a preset resource location via a Physical Broadcast Channel (PBCH).
  • PBCH Physical Broadcast Channel
  • the preset resource location may be embodied as one of the followings.
  • the PBCH may be located on last Y OFDM symbols of a first slot of a subframe and first X OFDM symbols of a second slot of the subframe.
  • the PBCH may be located on any R OFDM symbols in first predefined OFDM symbols in a subframe, wherein R may be equal to 4, 5, 6 or 8, and the first predefined OFDM symbols may include at least one of: a second OFDM symbol of each slot, a third OFDM symbol of each slot, a fourth last OFDM symbol of each slot, and last two OFDM symbols of each slot.
  • X may be equal to 4, 5, 6 or 7, and Y may be equal to 0, 1, 2, 3, 4 or 5.
  • the first predefined OFDM symbols may include one of the following:
  • the first predefined OFDM symbols may include last two OFDM symbols of each slot;
  • the first predefined OFDM symbols may include last two OFDM symbols of each slot and a fourth last OFDM symbol of a second slot, or, the first predefined OFDM symbols may include last two OFDM symbols of each slot and a third OFDM symbol of a second slot;
  • the first predefined OFDM symbols may include last two OFDM symbols of each slot, and a fourth last OFDM symbol and a second OFDM symbol of a second slot, or, the first predefined OFDM symbols may include last two OFDM symbols of each slot and a fourth last OFDM symbol of each slot, or, the first predefined OFDM symbols may include last two OFDM symbols of each slot, and a second OFDM symbol and a third OFDM symbol of a second slot; and
  • the first predefined OFDM symbols may include a second OFDM symbol, a third OFDM symbol and last two OFDM symbols of each slot.
  • the PBCH and a synchronization channel may be located on adjacent subframes.
  • the PBCH and the synchronization channel may be located on adjacent subframes which may be embodied as one of the following:
  • the synchronization channel may be located on a subframe # 9
  • the PBCH may be located on a subframe # 0 ;
  • the synchronization channel may be located on a subframe # 0
  • the PBCH may be located on a subframe # 9 ;
  • the synchronization channel may be located on a subframe # 8
  • the PBCH may be located on a subframe # 9 ;
  • the synchronization channel may be located on a subframe # 6
  • the PBCH may be located on a subframe # 5 ;
  • the synchronization channel may be located on a subframe # 4
  • the PBCH may be located on a subframe # 5 ;
  • the synchronization channel may be located on a subframe # 5
  • the PBCH may be located on a subframe # 4 ;
  • the synchronization channel may be located on a subframe # 3
  • the PBCH may be located on a subframe # 4 ;
  • the synchronization channel may be located on a subframe # 1
  • the PBCH may be located on a subframe # 0 .
  • the preset resource location may be embodied as follows.
  • the PBCH may be mapped to T radio frames, and may be located on the same one or more subframes of each radio frame, wherein T may be equal to 3, 6, 9, 18 or 36.
  • the one or more subframes may include one or more of: a subframe # 0 of a radio frame, a subframe # 4 of a radio frame, a subframe # 5 of a radio frame, or a subframe # 9 of a radio frame.
  • the PBCH may be transmitted at an interval of Z1 radio frames, and may be repeatedly transmitted for Z2 times by every Z1*Z2 radio frames.
  • Z1 may be equal to 4, 6, 8, 12 or 24, and Z2 may be equal to 4, 6, 8, 12 or 16.
  • the PBCH may be demodulated by using a narrowband reference signal.
  • the narrowband reference signal may be transmitted on one or more subframes for transmitting the PBCH, and the narrowband reference signal may be transmitted on second predefined OFDM symbols.
  • the second predefined OFDM symbols may include last two OFDM symbols of each slot in a subframe, or, each OFDM symbol for transmitting the PBCH.
  • system message may be transmitted at the preset resource location in one of the following manners.
  • the system message may be transmitted at the preset resource location via a physical shared channel, or the system message may be transmitted at the preset resource location via a physical shared channel and a PBCH.
  • system message may be transmitted at the preset resource location via the physical shared channel in a manner as follows.
  • a start OFDM symbol of a physical shared channel carrying the system message in a subframe may be a fixed value, and corresponding available resource elements may be remaining resources after a fixed virtual cell CRS port is removed.
  • the physical shared channel carrying the system message, a synchronization channel and the PBCH may be located on different subframes.
  • one or more subframes of the physical shared channel carrying the system message may include one or more of a subframe # 0 , a subframe # 4 , a subframe # 5 and a subframe # 9 .
  • the configuration information of the physical shared channel carrying the system message may include at least one of:
  • the configuration information of terminal access may include:
  • the device may include a system module 32 and a channel module 34 .
  • the system module 32 may be configured to transmit a system message at a preset resource location.
  • the channel module 34 may be configured to transmit a physical downlink channel according to the system message.
  • the system message may include at least one of: frequency domain location information of a system, configuration information of a physical shared channel carrying a system message, configuration information of terminal access, available resource information of the physical downlink channel, and radio frame information.
  • the available resource information of the physical downlink channel may include: information of a start OFDM symbol of the physical downlink channel in a subframe, and/or information of one or more unavailable resource elements of the physical downlink channel in a subframe, and/or information of one or more available subframes of the physical downlink channel.
  • the device may further include an indication module 36 .
  • the indication module 36 may be configured to indicate the information of the one or more unavailable resource elements via a CRS port location and/or a CSI-RS port location.
  • the indication via the CRS port location and/or the CSI-RS port location may be determined by a number of ports and/or a virtual cell identity.
  • system module 32 may be configured to transmit a system message at a preset resource location in a following manner.
  • the system module 32 may be configured to transmit the system message at the preset resource location via a PBCH.
  • the preset resource location may be embodied as one of the followings.
  • the PBCH may be located on last Y OFDM symbols of a first slot of a subframe and first X OFDM symbols of a second slot of the subframe.
  • the PBCH may be located on any R OFDM symbols in first predefined OFDM symbols in a subframe, wherein R is equal to 4, 5, 6 or 8, and the first predefined OFDM symbols may include at least one of: a second OFDM symbol of each slot, a third OFDM symbol of each slot, a fourth last OFDM symbol of each slot, and last two OFDM symbols of each slot.
  • X may be equal to 4, 5, 6 or 7, and Y may be equal to 0, 1, 2, 3, 4 or 5.
  • the first predefined OFDM symbols may include one of the following:
  • the first predefined OFDM symbols may include last two OFDM symbols of each slot;
  • the first predefined OFDM symbols may include last two OFDM symbols of each slot and a fourth last OFDM symbol of a second slot, or, the first predefined OFDM symbols may include last two OFDM symbols of each slot and a third OFDM symbol of a second slot;
  • the first predefined OFDM symbols may include last two OFDM symbols of each slot, and a fourth last OFDM symbol and a second OFDM symbol of a second slot, or, the first predefined OFDM symbols may include last two OFDM symbols of each slot and a fourth last OFDM symbol of each slot, or, the first predefined OFDM symbols may include last two OFDM symbols of each slot, and a second OFDM symbol and a third OFDM symbol of a second slot; and
  • the first predefined OFDM symbols may include a second OFDM symbol, a third OFDM symbol and last two OFDM symbols of each slot.
  • the PBCH and a synchronization channel may be located on adjacent subframes.
  • the PBCH and the synchronization channel may be located on adjacent subframes which may be embodied as one of the following:
  • the synchronization channel may be located on a subframe # 9
  • the PBCH may be located on a subframe # 0 ;
  • the synchronization channel may be located on a subframe # 0
  • the PBCH may be located on a subframe # 9 ;
  • the synchronization channel may be located on a subframe # 8
  • the PBCH may be located on a subframe # 9 ;
  • the synchronization channel may be located on a subframe # 6
  • the PBCH may be located on a subframe # 5 ;
  • the synchronization channel may be located on a subframe # 4
  • the PBCH may be located on a subframe # 5 ;
  • the synchronization channel may be located on a subframe # 5
  • the PBCH may be located on a subframe # 4 ;
  • the synchronization channel may be located on a subframe # 3
  • the PBCH may be located on a subframe # 4 ;
  • the synchronization channel may be located on a subframe # 1
  • the PBCH may be located on a subframe # 0 .
  • the preset resource location may be embodied as follows.
  • the PBCH may be mapped to T radio frames, and may be located on the same one or more subframes of each radio frame, wherein T may be equal to 3, 6, 9, 18 or 36.
  • the one or more subframes may include one or more of: a subframe # 0 of a radio frame, a subframe # 4 of a radio frame, a subframe # 5 of a radio frame, or a subframe # 9 of a radio frame.
  • the PBCH of the system module 32 may be transmitted at an interval of Z1 radio frames, and may be repeatedly transmitted for Z2 times by every Z1*Z2 radio frames.
  • Z1 may be equal to 4, 6, 8, 12 or 24, and Z2 may be equal to 4, 6, 8, 12 or 16.
  • the PBCH may be demodulated by using a narrowband reference signal.
  • the narrowband reference signal may be transmitted on one or more subframes for transmitting the PBCH, and the narrowband reference signal may be transmitted on second predefined OFDM symbols.
  • the second predefined OFDM symbols may include last two OFDM symbols of each slot in a subframe, or, each OFDM symbol for transmitting the PBCH.
  • system module 32 may be configured to transmit a system message at a preset resource location in one of the following manners.
  • the system module 32 may be configured to transmit the system message at the preset resource location via a physical shared channel, or the system module 32 may be configured to transmit the system message at the preset resource location via a physical shared channel and a PBCH.
  • system module 32 may be configured to transmit the system message at the preset resource location via the physical shared channel in a following manner.
  • a start OFDM symbol of a physical shared channel carrying the system message in a subframe may be a fixed value, and corresponding available resource elements may be remaining resources after a fixed virtual cell CRS port is removed.
  • the physical shared channel carrying the system message, a synchronization channel and the PBCH may be located on different subframes.
  • one or more subframes of the physical shared channel carrying the system message may include one or more of a subframe # 0 , a subframe # 4 , a subframe # 5 and a subframe # 9 .
  • the configuration information of the physical shared channel carrying the system message may include at least one of:
  • the configuration information of terminal access may include:
  • a system message may be transmitted at a preset resource location, and then a physical downlink channel may be transmitted according to the system message.
  • FIG. 1 is a structure diagram of an LTE system frame
  • FIG. 2 is a flowchart of a system message transmission method according to an embodiment of the disclosure
  • FIG. 3 is a structure diagram of a system message transmission device according to an embodiment of the disclosure.
  • FIGS. 4 to 7 are schematic diagrams of locations of narrowband reference signals according to an embodiment of the disclosure.
  • a radio frame in an LTE system may follow frame structures in a Frequency Division Duplex (FDD) mode and a Time Division Duplex (TDD) mode.
  • the frame structure in the FDD mode is as shown in FIG. 1 .
  • a radio frame of 10 ms may include twenty slots of 0.5 ms, numbered as 0 to 19, and slots 2i and 2i+1 may form a subframe i of 1 ms.
  • CP Cyclic Prefix
  • each slot may contain 7 symbols of 66.7 us, wherein the CP length of the first symbol is 5.21 us, and the CP lengths of the other six symbols are 4.69 us.
  • each slot may contain 6 symbols, and the CP length of all the symbols are 16.67 us.
  • the number of CRS ports in the LTE system may be 1, 2 or 4, the number of CSI-RS ports may be 1, 2, 4 or 8. Different numbers of ports may correspond to different numbers of resource elements and different locations.
  • a downlink control channel in the LTE system may be located on first n OFDM symbols of a subframe, n being 1, 2, 3 or 4.
  • the NB-LTE system may adopt single-port transmission.
  • the bandwidth of the NB-LTE system is only 200 k, time domain resources occupied by a PBCH and a synchronization signal of the NB-LTE system are increased relative to the LTE system. Therefore, a method for mapping a PBCH and a synchronization signal of an LTE system is no longer applicable, and therefore a new method is desired.
  • the NB-LTE system sends a system message to an NB-LTE UE to inform of available resources, in order that the NB-LTE system can perform data transmission according to whether a spectrum is shared. Meanwhile, consistency between the NB-LTE system and the NB-LTE UE is also ensured.
  • an embodiment of the disclosure provides a system message transmission method, including the steps as follows.
  • a system message may be transmitted at a preset resource location.
  • a physical downlink channel may be transmitted according to the system message.
  • the system message may include at least one of: frequency domain location information of a system, configuration information of a physical shared channel carrying a system message, configuration information of terminal access, available resource information of the physical downlink channel, and radio frame information.
  • the physical downlink channel may include a physical downlink shared channel and/or a physical downlink control channel.
  • the method in the embodiments of the disclosure may be applied to the following systems: NB-LTE, or other OFDM systems, or other narrowband systems.
  • the transmission may include: sending and/or receiving.
  • the available resource information of the physical downlink channel may include: information of a start OFDM symbol of the physical downlink channel in a subframe, and/or information of one or more unavailable resource elements of the physical downlink channel in a subframe, and/or information of one or more available subframes of the physical downlink channel.
  • the information of one or more available subframes of the physical downlink channel may be indicated in one of the following alternative manners.
  • the available subframes may be periodically indicated by using a bitmap.
  • unavailable subframes may be periodically indicated by using a bitmap.
  • J bits may be used to indicate the availability of each subframe in J subframes.
  • each bit correspondingly indicates the availability of one subframe in J subframes, for example, 1 represents Available, and 0 represents Unavailable; or, 0 represents Available, and 1 represents Unavailable.
  • J may be equal to 40, 80, 120, 160 or 240.
  • the method may further include a step of indicating the information of the one or more unavailable resource elements via a CRS port location and/or a CSI-RS port location.
  • the indication via the CRS port location and/or the CSI-RS port location may be determined by a number of ports and/or a virtual cell identity.
  • the system message may be transmitted at the preset resource location in the following manner.
  • the system message may be transmitted at the preset resource location via a PBCH.
  • the PBCH may be located on last Y OFDM symbols of a first slot of a subframe and first X OFDM symbols of a second slot of the subframe.
  • X may be equal to 4, 5, 6 or 7, and Y may be equal to 0, 1, 2, 3, 4 or 5.
  • the PBCH may be located on any R OFDM symbols in first predefined OFDM symbols in a subframe, wherein R may be equal to 4, 5, 6 or 8.
  • the first predefined OFDM symbols may include at least one of: a second OFDM symbol of each slot, a third OFDM symbol of each slot, a fourth last OFDM symbol of each slot, and last two OFDM symbols of each slot.
  • the first predefined OFDM symbols may include last two OFDM symbols of each slot.
  • the first predefined OFDM symbols may include last two OFDM symbols of each slot and a fourth last OFDM symbol of a second slot, or, the first predefined OFDM symbols may include last two OFDM symbols of each slot and a third OFDM symbol of a second slot.
  • the first predefined OFDM symbols may include last two OFDM symbols of each slot, and a fourth last OFDM symbol and a second OFDM symbol of a second slot, or, the first predefined OFDM symbols may include last two OFDM symbols of each slot and a fourth last OFDM symbol of each slot, or, the first predefined OFDM symbols may include last two OFDM symbols of each slot, and a second OFDM symbol and a third OFDM symbol of a second slot.
  • the first predefined OFDM symbols may include a second OFDM symbol, a third OFDM symbol and last two OFDM symbols of each slot.
  • a narrowband reference signal may be transmitted on second predefined OFDM symbols.
  • the second predefined OFDM symbols may include: last two OFDM symbols of each slot in a subframe, or, each OFDM symbol for transmitting the PBCH.
  • the narrowband reference signal may be used to demodulate the PBCH, and the narrowband reference signal may be transmitted on one or more subframes for transmitting the PBCH.
  • the number of antenna ports of the narrowband reference signal may be equal to 1 or 2.
  • a frequency domain interval of reference signals of the same port may be 6 subcarriers, and a frequency domain location offset of reference signals of the same port on adjacent OFDM symbols may be 3 subcarriers.
  • Initial locations of the antenna ports of the narrowband reference signal may be determined according to a cell identity.
  • 1 is an OFDM symbol index.
  • 1 is an OFDM symbol index.
  • R 0 indicates a first port
  • R 1 indicates a second port
  • the first predefined symbols are OFDM symbols on which no CRS of the LTE system is sent.
  • the transmission of a PBCH on the first predefined symbols may reduce influence of a CRS on the PBCH, and may particularly reduce mutual influence between a new system (narrowband system) and an LTE system on the same spectrum when cell identities corresponding to the two systems are different.
  • the adoption of the specific first predefined symbols mentioned above mainly considers influence of the narrowband reference signal on demodulation performance.
  • an OFDM symbol carrying the PBCH is ensured to the greatest extent to be located on an OFDM symbol on which the narrowband reference signal is located.
  • the first predefined OFDM symbols are selected to be in an intermediate region on an OFDM symbol on which the narrowband reference signal is located, so that good transmission performance can be obtained.
  • the PBCH and a synchronization channel may be located on adjacent subframes. Specifically, the locations of the PBCH and the synchronization channel may be embodied as one of the followings.
  • the synchronization channel may be located on a subframe # 9
  • the PBCH may be located on a subframe # 0 .
  • the synchronization channel may be located on a subframe # 0
  • the PBCH may be located on a subframe # 9 .
  • the synchronization channel may be located on a subframe # 8
  • the PBCH may be located on a subframe # 9 .
  • the synchronization channel may be located on a subframe # 6
  • the PBCH may be located on a subframe # 5 .
  • the synchronization channel may be located on a subframe # 4
  • the PBCH may be located on a subframe # 5 .
  • the synchronization channel may be located on a subframe # 5
  • the PBCH may be located on a subframe # 4 .
  • the synchronization channel may be located on a subframe # 3
  • the PBCH may be located on a subframe # 4 .
  • the synchronization channel may be located on a subframe # 1
  • the PBCH may be located on a subframe # 0 .
  • the PBCH may be mapped to T radio frames, and may be located on the same one or more subframes of each radio frame. T may be equal to 3, 6, 9, 18 or 36.
  • the mapping mentioned herein refers to single transmission of the PBCH, and resource definition of a repeated transmission scenario of the PBCH is not involved.
  • the one or more subframes may include one or more of a subframe # 0 of a radio frame, a subframe # 4 of a radio frame, a subframe # 5 of a radio frame, or a subframe # 9 of a radio frame.
  • the PBCH may be transmitted at an interval of Z1 radio frames, and may be repeatedly transmitted for Z2 times by every Z1*Z2 radio frames.
  • Z1 may be equal to 4, 6, 8, 12 or 24, and Z2 may be equal to 4, 6, 8, 12 or 16.
  • the system message may be transmitted at the preset resource location in one of the manners as follows.
  • the system message may be transmitted at the preset resource location via a physical shared channel.
  • the system message may be transmitted at the preset resource location via a physical shared channel and a PBCH.
  • a start OFDM symbol of a physical shared channel carrying the system message in a subframe may be a fixed value, and corresponding available resource elements may be remaining resources after a fixed virtual cell CRS port is removed.
  • the location of the virtual cell CRS port may be the same as a resource location corresponding to a CRS port (single port, two ports, and four ports) in a relevant LTE system.
  • the resource elements corresponding to a four-port CRS in the relevant LTE system may be selected to serve as resource elements corresponding to the virtual cell CRS port.
  • the physical shared channel carrying the system message, the synchronization channel and the PBCH may be located on different subframes.
  • One or more subframes of the physical shared channel carrying the system message may include one or more of a subframe # 0 , a subframe # 4 , a subframe # 5 and a subframe # 9 .
  • the synchronization channel and the PBCH may be located on the subframe # 4 and the subframe # 5 (the two subframes may be exchanged) of a radio frame respectively, and the physical shared channel carrying the system message may be located on the subframe # 9 and/or the subframe # 0 .
  • the synchronization channel and the PBCH may be located on the subframe # 9 and the subframe # 0 (the two subframes may be exchanged) of a radio frame respectively, and the physical shared channel carrying the system message may be located on the subframe # 4 and/or the subframe # 5 .
  • the physical shared channel carrying the system message may be located on W successive radio frames, W being equal to 3, 6, 9 or 12.
  • a system message transmission device may include a system module 32 and a channel module 34 .
  • the system module 32 may be configured to transmit a system message at a preset resource location.
  • the channel module 34 may be configured to transmit a physical downlink channel according to the system message.
  • the system message may include at least one of: frequency domain location information of a system, configuration information of a physical shared channel carrying a system message, configuration information of terminal access, available resource information of the physical downlink channel, and radio frame information.
  • the available resource information of the physical downlink channel may include: information of a start OFDM symbol of the physical downlink channel in a subframe, and/or information of one or more unavailable resource elements of the physical downlink channel in a subframe, and/or information of one or more available subframes of the physical downlink channel.
  • the device may further include an indication module 36 .
  • the indication module 36 may be configured to indicate the information of the one or more unavailable resource elements via a CRS port location and/or a CSI-RS port location.
  • the indication via the CRS port location and/or the CSI-RS port location may be determined by a number of ports and/or a virtual cell identity.
  • the virtual cell identity is mainly used to indicate a cell identity of an LTE system during coexistence of a new system (narrowband system) and the LTE system, so that the reference signal location can be determined.
  • the virtual cell identity may include an LTE cell identity or a predefined offset value, the predefined offset value being equal to 0, 1, 2, 3, 4 or 5.
  • the information of one or more available subframes of the physical downlink channel may be indicated in one of the following alternative manners.
  • the available subframes may be periodically indicated by using a bitmap.
  • unavailable subframes may be periodically indicated by using a bitmap.
  • J bits may be used to indicate the availability of each subframe in J subframes.
  • each bit correspondingly indicates the availability of one subframe in J subframes, for example, 1 represents Available, and 0 represents Unavailable; or, 0 represents Available, and 1 represents Unavailable.
  • J may be equal to 40, 80, 120, 160 or 240.
  • the system module 32 may be configured to transmit a system message at a preset resource location in the following manner.
  • the system module 32 may be configured to transmit the system message at the preset resource location via a PBCH.
  • the preset resource location may be embodied as follows.
  • the PBCH may be located on last Y OFDM symbols of a first slot of a subframe and first X OFDM symbols of a second slot of the subframe.
  • X may be equal to 4, 5, 6 or 7, and Y may be equal to 0, 1, 2, 3, 4 or 5.
  • the PBCH may be located on any R OFDM symbols in first predefined OFDM symbols in a subframe, wherein R may be equal to 4, 5, 6 or 8.
  • the first predefined OFDM symbols may include at least one of: a second OFDM symbol of each slot, a fourth last OFDM symbol of each slot, last two OFDM symbols of each slot, and a third OFDM symbol of each slot.
  • the first predefined OFDM symbols may include last two OFDM symbols of each slot.
  • the first predefined OFDM symbols may include last two OFDM symbols of each slot and a fourth last OFDM symbol of a second slot, or, the first predefined OFDM symbols may include last two OFDM symbols of each slot and a third OFDM symbol of a second slot.
  • the first predefined OFDM symbols may include last two OFDM symbols of each slot, and a fourth last OFDM symbol and a second OFDM symbol of a second slot, or, the first predefined OFDM symbols may include last two OFDM symbols of each slot and a fourth last OFDM symbol of each slot, or, the first predefined OFDM symbols may include last two OFDM symbols of each slot, and a second OFDM symbol and a third OFDM symbol of a second slot.
  • the first predefined OFDM symbols may include a second OFDM symbol, a third OFDM symbol and last two OFDM symbols of each slot.
  • a narrowband reference signal may be transmitted on second predefined OFDM symbols.
  • the second predefined OFDM symbols may include: last two OFDM symbols of each slot in a subframe, or, each OFDM symbol for transmitting the PBCH.
  • the narrowband reference signal may be used to demodulate the PBCH, and the narrowband reference signal may be transmitted on one or more subframes for transmitting the PBCH.
  • the number of antenna ports of the narrowband reference signal may be equal to 1 or 2.
  • a frequency domain interval of reference signals of the same port may be 6 subcarriers, and a frequency domain location offset of reference signals of the same port on adjacent OFDM symbols may be 3 subcarriers.
  • Initial locations of the antenna ports of the narrowband reference signal may be determined according to a cell identity.
  • the PBCH and a synchronization channel may be located on adjacent subframes.
  • the PBCH and a synchronization channel may be located on adjacent subframes. Specifically, the locations of the PBCH and the synchronization channel may be embodied as one of the followings.
  • the synchronization channel may be located on a subframe # 9
  • the PBCH may be located on a subframe # 0 .
  • the synchronization channel may be located on a subframe # 0
  • the PBCH may be located on a subframe # 9 .
  • the synchronization channel may be located on a subframe # 8
  • the PBCH may be located on a subframe # 9 .
  • the synchronization channel may be located on a subframe # 6
  • the PBCH may be located on a subframe # 5 .
  • the synchronization channel may be located on a subframe # 4
  • the PBCH may be located on a subframe # 5 .
  • the synchronization channel may be located on a subframe # 5
  • the PBCH may be located on a subframe # 4 .
  • the synchronization channel may be located on a subframe # 3
  • the PBCH may be located on a subframe # 4 .
  • the synchronization channel may be located on a subframe # 1
  • the PBCH may be located on a subframe # 0 .
  • the PBCH may be mapped to T radio frames, and may be located on the same one or more subframes of each radio frame.
  • the one or more subframes may include one or more of a subframe # 0 of a radio frame, a subframe # 4 of a radio frame, a subframe # 5 of a radio frame, or a subframe # 9 of a radio frame.
  • the PBCH of the system module 32 may be transmitted at an interval of Z1 radio frames, and may be repeatedly transmitted for Z2 times by every Z1*Z2 radio frames.
  • Z1 may be equal to 4, 6, 8, 12 or 24, and Z2 may be equal to 4, 6, 8, 12 or 16.
  • the system module 32 may be configured to transmit a system message at a preset resource location in one of the following manners.
  • the system module 32 may be configured to transmit the system message at the preset resource location via a physical shared channel. Alternatively, the system module 32 may be configured to transmit the system message at the preset resource location via a physical shared channel and a PBCH.
  • the system message may be transmitted at the preset resource location via the physical shared channel in a following manner.
  • a start OFDM symbol of a physical shared channel carrying the system message in a subframe may be a fixed value, and corresponding available resource elements may be remaining resources after a fixed virtual cell CRS port is removed.
  • the physical shared channel carrying the system message, the synchronization channel and the PBCH may be located on different subframes.
  • One or more subframes of the physical shared channel carrying the system message may include one or more of a subframe # 0 , a subframe # 4 , a subframe # 5 and a subframe # 9 .
  • the information of the start OFDM symbol may include two or four states.
  • a 1 bit signaling may be included to represent available resource information of the physical downlink channel.
  • Two resource mapping modes may be predefined and indicated by 1 bit signaling.
  • the available resource information of the physical downlink channel can be indicated by the signaling.
  • the first mapping mode may include: a physical downlink channel is mapped starting from a first OFDM symbol of a subframe, and/or corresponding available resource elements may be remaining resources after a fixed single-port virtual cell CRS is removed; and the second mapping mode may include: a physical downlink channel is mapped starting from a fourth OFDM symbol of a subframe, and/or corresponding available resource elements may be remaining resources after a fixed four-port virtual cell CRS is removed.
  • the first mapping mode may include: a physical downlink channel is mapped starting from a first OFDM symbol of a subframe, and/or corresponding available resource elements may be remaining resources after a fixed single-port virtual cell CRS is removed; and the second mapping mode may include: a physical downlink channel is mapped starting from a fifth OFDM symbol of a subframe, and/or corresponding available resource elements may be remaining resources after a fixed four-port virtual cell CRS is removed.
  • An alternative manner is: defining signaling respectively for the information of the start OFDM symbol of the physical downlink channel in a subframe and the information of one or more available resource elements of the physical downlink channel in a subframe.
  • the information of the start OFDM symbol of the physical downlink channel in a subframe may occupy 1 bit, indicating a first OFDM symbol, or a k th OFDM symbol, where k is equal to 3, 4 or 5 optionally.
  • the information of the start OFDM symbol of the physical downlink channel in a subframe may occupy 2 bits, indicating first, second, third or fourth OFDM symbol.
  • the information of one or more available resource elements of the physical downlink channel in a subframe may be indicated via a CRS port location and/or a CSI-RS port location.
  • the CRS port location may be 1, 2 or 4, or, the CRS port location may be 1 or 4.
  • the CSI-RS port location may be Null, or may be one or more selected CSI-RS resource configuration indexes in a relevant LTE system.
  • the CSI-RS port location being Null represents that no CSI-RS is sent.
  • the PBCH may be located on non-MBSFN subframes ( 0 , 4 , 5 , 9 ).
  • Locating of a synchronization signal on an MBSFN subframe may avoid influence of a CRS of an LTE system on the synchronization signal. However, this may limit multicast service transmission. Therefore, a PBCH mapping solution is provided for two scenarios, i.e., a scenario in which the synchronization signal is located on MBSFN subframes ( 1 , 2 , 3 , 6 , 7 , 8 ) and a scenario in which the synchronization signal is not located on MBSFN subframes ( 0 , 4 , 5 , 9 ).
  • the mapping solution may include transmitting the system message at the preset resource location via a PBCH.
  • the preset resource location may be embodied as follows.
  • the PBCH may be located on last Y OFDM symbols of a first slot of a subframe and first X OFDM symbols of a second slot of the subframe.
  • X may be equal to 4, 5, 6 or 7, and Y may be equal to 0, 1, 2, 3, 4 or 5.
  • the PBCH may be located on any R OFDM symbols in first predefined OFDM symbols in a subframe, wherein R may be equal to 4, 5, 6 or 8, and the first predefined OFDM symbols may include at least one of: a second OFDM symbol of each slot, a fourth last OFDM symbol of each slot, last two OFDM symbols of each slot, and a third OFDM symbol of each slot.
  • a PBCH may be located on an adjacent subframe different from the subframe of a synchronization channel. However, it is not limited that a PBCH is present on an adjacent subframe of a synchronization channel for sure.
  • the number of subframes occupied by the synchronization channel may be greater than or equal to the number of subframes occupied by the PBCH.
  • primary synchronization signals may be located on subframes #k of odd-indexed radio frames, and secondary synchronization signals may be located on subframes #k of even-indexed radio frames, wherein k may be equal to 1, 2, 3, 6, 7 or 8.
  • primary synchronization signals may be located on subframes #k of even-indexed radio frames, and secondary synchronization signals may be located on subframes #k of odd-indexed radio frames, wherein k may be equal to 1, 2, 3, 6, 7 or 8.
  • the subframes may be numbered starting from 0.
  • the primary synchronization signals may be located on subframes #k of odd-indexed radio frames, and the secondary synchronization signals may be located on subframes #k of even-indexed radio frames, wherein k may be equal to 0, 4, 5 or 9.
  • the primary synchronization signals may be located on subframes #k of even-indexed radio frames, and the secondary synchronization signals may be located on subframes #k of odd-indexed radio frames, wherein k may be equal to 0, 4, 5 or 9.
  • the subframes may be numbered starting from 0.
  • the PBCH may be mapped to a subframe #k of each radio frame by taking 6 successive radio frames as a period, wherein k may be equal to 0, 4, 5 or 9.
  • the PBCH may be mapped to subframes #k of first three radio frames within each period by taking 6 successive radio frames as a period, wherein k may be equal to 0, 4, 5 or 9.
  • the PBCH may be mapped to a subframe #k of each radio frame by taking 8 successive radio frames as a period, wherein k may be equal to 0, 4, 5 or 9.
  • the transmission may include: sending and/or receiving.
  • the sending process may include steps as follows.
  • An NB-LTE base station sends a system message to an NB-LTE terminal, and the NB-LTE base station sends a physical downlink channel to the NB-LTE terminal according to the system message.
  • the NB-LTE base station may send a system message to the NB-LTE terminal at a preset resource location.
  • the NB-LTE base station may send a physical downlink channel to the NB-LTE terminal according to the system message.
  • the system message may include at least one of: frequency domain location information of a system, configuration information of a physical shared channel carrying a system message, configuration information of terminal access, available resource information of the physical downlink channel, and radio frame information.
  • the NB-LTE frequency domain location information is mainly used to generate a CRS sequence.
  • the CRS sequence may be generated based on an LTE system CRS sequence generation method. Therefore, a frequency domain location corresponding to NB-LTE to generate the CRS sequence may be determined.
  • the configuration information of a physical shared channel carrying a system message may include at least one of: a number of bits for carrying the system message in the physical shared channel, a number of subframes occupied by the physical shared channel, and information of one or more radio frames occupied by the physical shared channel.
  • the configuration information of terminal access may include: whether terminal access is allowed, and/or system state information, and/or configuration information of terminal uplink access resources.
  • the system state information may be used for a terminal to determine whether and/or how to access the system.
  • the available resource information of the physical downlink channel may include: information of a start OFDM symbol of the physical downlink channel in a subframe, and/or information of one or more unavailable resource elements of the physical downlink channel in a subframe, and/or information of one or more available subframes of the physical downlink channel.
  • the information of one or more available subframes of the physical downlink channel may be indicated in one of the following manners.
  • the available subframes may be indicated periodically by using a bitmap.
  • unavailable subframes may be indicated periodically by using a bitmap.
  • J bits may be used to indicate the availability of each subframe in J subframes.
  • each bit correspondingly indicates the availability of one subframe in J subframes, for example, 1 represents Available, and 0 represents Unavailable; or, 0 represents Available, and 1 represents Unavailable.
  • J may be 40, 80, 120, 160 or 240.
  • the information of the one or more unavailable resource elements may be indicated via a CRS port location and/or a CSI-RS port location.
  • the indication via the CRS port location and/or the CSI-RS port location may be determined by a number of ports and/or a virtual cell identity.
  • the system message may be transmitted at a preset resource location in the following manner.
  • the system message may be transmitted at a preset resource location via a PBCH.
  • the preset resource location may be embodied as follows.
  • the PBCH may be located on last Y OFDM symbols of a first slot of a subframe and first X OFDM symbols of a second slot of the subframe.
  • X may be equal to 4, 5, 6 or 7, and Y may be equal to 0, 1, 2, 3, 4 or 5.
  • the PBCH may be located on any R OFDM symbols in first predefined OFDM symbols in a subframe, wherein R may be equal to 4, 5, 6 or 8.
  • the first predefined OFDM symbols may include at least one of: a second OFDM symbol of each slot, a fourth last OFDM symbol of each slot, last two OFDM symbols of each slot, and a third OFDM symbol of each slot.
  • the first predefined OFDM symbols may include last two OFDM symbols of each slot.
  • the first predefined OFDM symbols may include last two OFDM symbols of each slot and a fourth last OFDM symbol of a second slot, or, the first predefined OFDM symbols may include last two OFDM symbols of each slot and a third OFDM symbol of a second slot.
  • the first predefined OFDM symbols may include last two OFDM symbols of each slot, and a fourth last OFDM symbol and a second OFDM symbol of a second slot, or, the first predefined OFDM symbols may include last two OFDM symbols of each slot and a fourth last OFDM symbol of each slot, or, the first predefined OFDM symbols may include last two OFDM symbols of each slot, and a second OFDM symbol and a third OFDM symbol of a second slot.
  • the first predefined OFDM symbols may include a second OFDM symbol, a third OFDM symbol and last two OFDM symbols of each slot.
  • the PBCH and a synchronization channel may be located on adjacent subframes.
  • the PBCH and a synchronization channel may be located on adjacent subframes which may be embodied as one of the following:
  • the synchronization channel may be located on a subframe # 9
  • the PBCH may be located on a subframe # 0 ;
  • the synchronization channel may be located on a subframe # 0
  • the PBCH may be located on a subframe # 9 ;
  • the synchronization channel may be located on a subframe # 8
  • the PBCH may be located on a subframe # 9 ;
  • the synchronization channel may be located on a subframe # 6
  • the PBCH may be located on a subframe # 5 ;
  • the synchronization channel may be located on a subframe # 4
  • the PBCH may be located on a subframe # 5 ;
  • the synchronization channel may be located on a subframe # 5
  • the PBCH may be located on a subframe # 4 ;
  • the synchronization channel may be located on a subframe # 3
  • the PBCH may be located on a subframe # 4 ;
  • the synchronization channel may be located on a subframe # 1
  • the PBCH may be located on a subframe # 0 .
  • the preset resource location may be embodied as follows.
  • the PBCH may be mapped to T radio frames, and may be located on the same one or more subframes of each radio frame.
  • the one or more subframes may include one or more of a subframe # 0 of a radio frame, a subframe # 4 of a radio frame, a subframe # 5 of a radio frame, or a subframe # 9 of a radio frame.
  • the PBCH may be transmitted at an interval of Z1 radio frames, and may be repeatedly transmitted for Z2 times by every Z1*Z2 radio frames.
  • Z1 may be equal to 4, 6, 8, 12 or 24, and Z2 may be equal to 4, 6, 8, 12 or 16.
  • the system message may be transmitted at a preset resource location in one of the following manners.
  • the system message may be transmitted at a preset resource location via a physical shared channel.
  • the system message may be transmitted at a preset resource location via a physical shared channel and a PBCH.
  • the system message may be transmitted at a preset resource location via a physical shared channel in the following manner.
  • a start OFDM symbol of a physical shared channel carrying the system message in a subframe may be a fixed value, and corresponding available resource elements may be remaining resources after a fixed virtual cell CRS port is removed.
  • the physical shared channel carrying the system message, the synchronization channel and the PBCH may be located on different subframes.
  • One or more subframes of the physical shared channel carrying the system message may include one or more of a subframe # 0 , a subframe # 4 , a subframe # 5 and a subframe # 9 .
  • the receiving process may include the following steps.
  • the NB-LTE terminal receives a system message sent by the NB-LTE base station, and the NB-LTE terminal receives a physical downlink channel according to the system message.
  • the system message may include at least one of: frequency domain location information of a system, configuration information of a physical shared channel carrying a system message, configuration information of terminal access, available resource information of the physical downlink channel, and radio frame information.
  • the available resource information of the physical downlink channel may include: information of a start OFDM symbol of the physical downlink channel in a subframe, and/or information of one or more unavailable resource elements of the physical downlink channel in a subframe, and/or information of one or more available subframes of the physical downlink channel.
  • the information of one or more available subframes of the physical downlink channel may be indicated in one of the following alternative manners.
  • the available subframes may be indicated periodically by using a bitmap.
  • the unavailable subframes may be indicated periodically by using a bitmap.
  • J bits may be used to indicate the availability of each subframe in J subframes.
  • each bit correspondingly indicates the availability of one subframe in J subframes, for example, 1 represents Available, and 0 represents Unavailable; or, 0 represents Available, and 1 represents Unavailable.
  • J may be 40, 80, 120, 160 or 240.
  • the information of the one or more unavailable resource elements may be indicated via a CRS port location and/or a CSI-RS port location.
  • the indication via the CRS port location and/or the CSI-RS port location may be determined by a number of ports and/or a virtual cell identity.
  • the system message may be transmitted at a preset resource location in the following manner.
  • the system message may be transmitted at a preset resource location via a PBCH.
  • the preset resource location may be embodied as follows.
  • the PBCH may be located on last Y OFDM symbols of a first slot of a subframe and first X OFDM symbols of a second slot of the subframe.
  • X may be equal to 4, 5, 6 or 7, and Y may be equal to 0, 1, 2, 3, 4 or 5.
  • the PBCH may be located on any R OFDM symbols in first predefined OFDM symbols in a subframe, wherein R may be equal to 4, 5, 6 or 8.
  • the first predefined OFDM symbols may include at least one of: a second OFDM symbol of each slot, a fourth last OFDM symbol of each slot, last two OFDM symbols of each slot, and a third OFDM symbol of each slot.
  • the first predefined OFDM symbols may include last two OFDM symbols of each slot.
  • the first predefined OFDM symbols may include last two OFDM symbols of each slot and a fourth last OFDM symbol of a second slot, or, the first predefined OFDM symbols may include last two OFDM symbols of each slot and a third OFDM symbol of a second slot.
  • the first predefined OFDM symbols may include last two OFDM symbols of each slot, and a fourth last OFDM symbol and a second OFDM symbol of a second slot, or, the first predefined OFDM symbols may include last two OFDM symbols of each slot and a fourth last OFDM symbol of each slot, or, the first predefined OFDM symbols may include last two OFDM symbols of each slot, and a second OFDM symbol and a third OFDM symbol of a second slot.
  • the first predefined OFDM symbols may include a second OFDM symbol, a third OFDM symbol and last two OFDM symbols of each slot.
  • the PBCH and a synchronization channel may be located on adjacent subframes.
  • the PBCH and a synchronization channel may be located on adjacent subframes which may be embodied as one of the following:
  • the synchronization channel may be located on a subframe # 9
  • the PBCH may be located on a subframe # 0 ;
  • the synchronization channel may be located on a subframe # 0
  • the PBCH may be located on a subframe # 9 ;
  • the synchronization channel may be located on a subframe # 8
  • the PBCH may be located on a subframe # 9 ;
  • the synchronization channel may be located on a subframe # 6
  • the PBCH may be located on a subframe # 5 ;
  • the synchronization channel may be located on a subframe # 4
  • the PBCH may be located on a subframe # 5 ;
  • the synchronization channel may be located on a subframe # 5
  • the PBCH may be located on a subframe # 4 ;
  • the synchronization channel may be located on a subframe # 3
  • the PBCH may be located on a subframe # 4 ;
  • the synchronization channel may be located on a subframe # 1
  • the PBCH may be located on a subframe # 0 .
  • the preset resource location may be embodied as follows.
  • the PBCH may be mapped to T radio frames, and may be located on the same one or more subframes of each radio frame.
  • the one or more subframes may include one or more of a subframe # 0 of a radio frame, a subframe # 4 of a radio frame, a subframe # 5 of a radio frame, or a subframe # 9 of a radio frame.
  • the PBCH may be transmitted at an interval of Z1 radio frames, and may be repeatedly transmitted for Z2 times by every Z1*Z2 radio frames.
  • Z1 may be equal to 4, 6, 8, 12 or 24, and Z2 may be equal to 4, 6, 8, 12 or 16.
  • the system message may be transmitted at a preset resource location in one of the following manners.
  • the system message may be transmitted at a preset resource location via a physical shared channel.
  • the system message may be transmitted at a preset resource location via a physical shared channel and a PBCH.
  • the system message may be transmitted at a preset resource location via a physical shared channel in the following manner.
  • a start OFDM symbol of a physical shared channel carrying the system message in a subframe may be a fixed value, and corresponding available resource elements may be remaining resources after a fixed virtual cell CRS port is removed.
  • the physical shared channel carrying the system message, the synchronization channel and the PBCH may be located on different subframes.
  • One or more subframes of the physical shared channel carrying the system message may include one or more of a subframe # 0 , a subframe # 4 , a subframe # 5 and a subframe # 9 .
  • the system message may include available resource information and radio frame information of the physical downlink channel and may be carried by a PBCH.
  • Two resource mapping modes are predefined, and indicated by 1 bit signaling.
  • the available resource information of the physical downlink channel may be indicated by the signaling.
  • the available resource information of the physical downlink channel may include information of a start OFDM symbol of the physical shared channel in a subframe and information of one or more available resource elements of the physical shared channel in a subframe.
  • a first mapping mode may include: a physical downlink channel is mapped starting from a first OFDM symbol of a subframe, and corresponding available resource elements may be remaining resources after a fixed single-port virtual cell CRS is removed.
  • a second mapping mode may include: a physical downlink channel is mapped starting from a fourth OFDM symbol of a subframe, and corresponding available resource elements may be remaining resources after a fixed four-port virtual cell CRS is removed.
  • the synchronization channel may be located on a subframe # 9 of a radio frame, and the PBCH may be located on a subframe # 0 of the radio frame.
  • the PBCH may be located on a subframe # 9 of a radio frame, and the synchronization channel may be located on a subframe # 0 of the radio frame.
  • the synchronization channel may be located on a subframe # 4 of a radio frame, and the PBCH may be located on a subframe # 5 of the radio frame.
  • the synchronization channel may be located on a subframe # 5 of a radio frame, and the PBCH may be located on a subframe # 4 of the radio frame.
  • the PBCH may be located on last Y OFDM symbols of a first slot of a subframe and first X OFDM symbols of a second slot of the subframe, wherein X may be equal to 4, 5, 6 or 7, and Y may be equal to 0, 1, 2, 3, 4 or 5.
  • the PBCH may be transmitted at an interval of Z1 radio frames, and may be repeatedly transmitted for Z2 times by every Z1*Z2 radio frames.
  • Z1 may be equal to 6, 8, 12 or 24, and Z2 may be equal to 4, 6, 8, 12 or 16.
  • the symbol may include first four or five OFDM symbols of a second slot of a subframe, or, the last OFDM symbol of a first slot of a subframe and first four OFDM symbols of a second slot of the subframe, or, last two OFDM symbols of a first slot of a subframe and first four OFDM symbols of a second slot of the subframe, or, last two OFDM symbols of a first slot of a subframe and first six OFDM symbols of a second slot of the subframe, or, last three OFDM symbols of a first slot of a subframe and first five OFDM symbols of a second slot of the subframe, or, last five OFDM symbols of a first slot of a subframe and first seven OFDM symbols of a second slot of the subframe, or, last three OFDM symbols of a first slot of a subframe and all OFDM symbols of a second slot of the subframe.
  • the mapping method may reduce the number of subframes for mapping a PBCH and reduce the transmission delay, and different CP types may adopt a unified design solution to the greatest extent.
  • the PBCH may be mapped to six successive radio frames, and may be located on a fixed subframe #Y1 of each radio frame. Y1 may be equal to one or more of 0, 4, 5 and 9.
  • the PBCH may be transmitted for four times within each period by taking 24 radio frames as a period.
  • the PBCH may be mapped to first three successive radio frames of every six radio frames, and may be located on a fixed subframe #Y1 of each radio frame.
  • Y1 may be equal to one or more of 0, 4, 5 and 9.
  • the PBCH may be transmitted for four times within each period by taking 24 radio frames as a period.
  • the PBCH may be mapped to eight successive radio frames, and may be located on a fixed subframe #Y1 of each radio frame.
  • Y1 may be equal to one or more of 0, 4, 5 and 9.
  • the PBCH may be transmitted for eight times within each period by taking 64 radio frames as a period.
  • the PBCH may be mapped to eight successive radio frames, and may be located on a fixed subframe #Y1 of each radio frame.
  • Y1 may be equal to one or more of 0, 4, 5 and 9.
  • the PBCH may be transmitted for six times within each period by taking 48 radio frames as a period.
  • the PBCH may be mapped to eight successive radio frames, and may be located on a fixed subframe #Y1 of each radio frame.
  • Y1 may be equal to one or more of 0, 4, 5 and 9.
  • the PBCH may be transmitted for 12 times within each period by taking 96 radio frames as a period.
  • the system message may include frequency domain location information of a system, configuration information of a physical shared channel carrying a system message, configuration information of terminal access, and radio frame information.
  • the system message may be carried by a PBCH.
  • the synchronization channel may be located on a subframe # 8 of a radio frame, and the PBCH may be located on a subframe # 9 of the radio frame.
  • the synchronization channel may be located on a subframe # 6 of a radio frame, and the PBCH may be located on a subframe # 5 of the radio frame.
  • the synchronization channel may be located on a subframe # 3 of a radio frame, and the PBCH may be located on a subframe # 4 of the radio frame.
  • the synchronization channel may be located on a subframe # 1 of a radio frame, and the PBCH may be located on a subframe # 0 of the radio frame.
  • the PBCH may be located on last Y OFDM symbols of a first slot of a subframe and first X OFDM symbols of a second slot of the subframe, wherein X may be equal to 4, 5, 6 or 7, and Y may be equal to 0, 1, 2, 3, 4 or 5.
  • the PBCH may be transmitted at an interval of Z1 radio frames, and may be repeatedly transmitted for Z2 times by every Z1*Z2 radio frames.
  • Z1 may be equal to 6, 8, 12 or 24, and Z2 may be equal to 4, 6, 8, 12 or 16.
  • the symbol may include first four or five OFDM symbols of a second slot of a subframe, or, the last OFDM symbol of a first slot of a subframe and first four OFDM symbols of a second slot of the subframe, or, last two OFDM symbols of a first slot of a subframe and first four OFDM symbols of a second slot of the subframe, or, last two OFDM symbols of a first slot of a subframe and first six OFDM symbols of a second slot of the subframe, or, last three OFDM symbols of a first slot of a subframe and first five OFDM symbols of a second slot of the subframe, or, last five OFDM symbols of a first slot of a subframe and first seven OFDM symbols of a second slot of the subframe, or, last three OFDM symbols of a first slot of a subframe and all OFDM symbols of a second slot of the subframe.
  • the mapping method may reduce the number of subframes for mapping a PBCH and reduce the transmission delay.
  • Different CP types may adopt a unified design solution to the greatest extent.
  • the PBCH may be mapped to six successive radio frames, and may be located on a fixed subframe #Y1 of each radio frame. Y1 may be equal to one or more of 0, 4, 5 and 9.
  • the PBCH may be transmitted for four times within each period by taking 24 radio frames as a period.
  • the PBCH may be mapped to first three successive radio frames of every six radio frames, and may be located on a fixed subframe #Y1 of each radio frame.
  • Y1 may be equal to one or more of 0, 4, 5 and 9.
  • the PBCH may be transmitted for four times within each period by taking 24 radio frames as a period.
  • the system message may include available resource information of the physical downlink channel, radio frame information, frequency domain location information of a system, configuration information of a physical shared channel carrying a system message, and configuration information of terminal access.
  • the radio frame information, the NB-LTE frequency domain location information and the configuration information of the physical shared channel carrying the system message may be carried by a PBCH.
  • the synchronization channel may be located on a subframe # 8 of a radio frame, and the PBCH may be located on a subframe # 9 of the radio frame.
  • the synchronization channel may be located on a subframe # 6 of a radio frame, and the PBCH may be located on a subframe # 5 of the radio frame.
  • the synchronization channel may be located on a subframe # 3 of a radio frame, and the PBCH may be located on a subframe # 4 of the radio frame.
  • the synchronization channel may be located on a subframe # 1 of a radio frame, and the PBCH may be located on a subframe # 0 of the radio frame.
  • the PBCH may be located on last Y OFDM symbols of a first slot of a subframe and first X OFDM symbols of a second slot of the subframe, wherein X may be equal to 4, 5, 6 or 7, and Y may be equal to 0, 1, 2, 3, 4 or 5.
  • the PBCH may be transmitted at an interval of Z1 radio frames, and may be repeatedly transmitted for Z2 times by every Z1*Z2 radio frames.
  • Z1 may be equal to 6, 8, 12 or 24, and Z2 may be equal to 4, 6, 8, 12 or 16.
  • the symbol may include first four or five OFDM symbols of a second slot of a subframe, or, the last OFDM symbol of a first slot of a subframe and first four OFDM symbols of a second slot of the subframe, or, last two OFDM symbols of a first slot of a subframe and first four OFDM symbols of a second slot of the subframe, or, last two OFDM symbols of a first slot of a subframe and first six OFDM symbols of a second slot of the subframe, or, last three OFDM symbols of a first slot of a subframe and first five OFDM symbols of a second slot of the subframe, or, last five OFDM symbols of a first slot of a subframe and first seven OFDM symbols of a second slot of the subframe, or, last three OFDM symbols of a first slot of a subframe and all OFDM symbols of a second slot of the subframe.
  • the mapping method may reduce the number of subframes for mapping a PBCH and reduce the transmission delay.
  • Different CP types may adopt a unified design solution to the greatest extent.
  • the PBCH may be mapped to six successive radio frames, and may be located on a fixed subframe #Y1 of each radio frame. Y1 may be equal to one or more of 0, 4, 5 and 9.
  • the PBCH may be transmitted for four times within each period by taking 24 radio frames as a period.
  • the PBCH may be mapped to first three successive radio frames of every six radio frames, and may be located on a fixed subframe #Y1 of each radio frame.
  • Y1 may be equal to one or more of 0, 4, 5 and 9.
  • the PBCH may be transmitted for four times within each period by taking 24 radio frames as a period.
  • the available resource information of the physical downlink channel and the configuration information of terminal access may be carried by a PBCH.
  • a start OFDM symbol of a physical shared channel carrying the system message in a subframe may be a first OFDM symbol, and corresponding available resource elements may be remaining resources after removing a 4-port virtual cell CRS port.
  • the physical downlink shared channel may be transmitted in a single-port manner.
  • Signaling is defined respectively for the information of the start OFDM symbol of the physical downlink channel in a subframe and information of one or more available resource elements of the physical downlink channel in a subframe.
  • the information of the start OFDM symbol of the physical downlink channel in a subframe may occupy 1 bit, indicating a first OFDM symbol, or a k th OFDM symbol, where k may be equal to 3, 4 or 5.
  • the information of the start OFDM symbol of the physical downlink channel in a subframe may occupy 2 bits, indicating the first, second, third or fourth OFDM symbol.
  • the information of one or more available resource elements of the physical downlink channel in a subframe may be indicated via a CRS port location and/or a CSI-RS port location.
  • the CRS port location may be 1, 2 or 4, or, the CRS port location may be 1 or 4.
  • the CSI-RS port location may include Null, or may be one or more selected CSI-RS resource configuration indexes in a relevant LTE system.
  • the physical shared channel carrying the system message, the synchronization channel and the PBCH may be located on different subframes.
  • the one or more subframes of the physical shared channel carrying the system message may include one or more of a subframe # 0 , a subframe # 4 , a subframe # 5 and a subframe # 9 .
  • the physical downlink channel may include a physical downlink shared channel and/or a physical downlink control channel.
  • Another embodiment of the disclosure provides a computer storage medium in which a computer-executable instruction is stored.
  • the computer-executable instruction is used to execute the method in the above-mentioned embodiments.
  • each module/unit in the above-mentioned embodiments may be implemented in a form of hardware, and for example, corresponding functions thereof are implemented by means of an integrated circuit.
  • Each module/unit may also be implemented in a form of software function module, and for example, corresponding functions thereof are implemented by executing programs/instructions stored in a memory by the processor.
  • the disclosure is not limited to the combination of hardware and software in any specific form.
  • the above-mentioned technical solutions can reduce the interference between signals during spectrum sharing between different systems and reduce the occurrence of simultaneous transmission of different signals over the same resource by different systems, thereby ensuring consistency between a system and a terminal, and improving the data transmission performance.

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