CN105610556B

CN105610556B - Downlink information sending method, downlink information receiving method and device

Info

Publication number: CN105610556B
Application number: CN201410626093.9A
Authority: CN
Inventors: 石靖; 夏树强; 戴博; 方惠英; 刘锟; 陈宪明; 张雯
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2014-11-07
Filing date: 2014-11-07
Publication date: 2019-12-31
Anticipated expiration: 2034-11-07
Also published as: CN105610556A; WO2016070675A1

Abstract

The invention discloses a downlink information sending method, a downlink information receiving method and a device, wherein the method comprises the following steps: grouping channels bearing different downlink information; and allocating the grouped channels to the narrow-band resources for transmission. The invention solves the problem that the downlink information can not be received under the condition of limited bandwidth in the prior art, and ensures the correct reception of the downlink information.

Description

Downlink information sending method, downlink information receiving method and device

Technical Field

The present invention relates to the field of communications, and in particular, to a downlink information transmitting method, a downlink information receiving method, and a downlink information transmitting apparatus.

Background

Machine Type Communication (MTC) User terminals (User Equipment, UE for short), also called Machine to Machine (M2M) User Communication devices, are currently the main application form of the internet of things. In recent years, due to the high spectrum efficiency of Long-Term Evolution (Long-Term Evolution, abbreviated LTE)/Long-Term Evolution advanced (Long-Term Evolution Advance, abbreviated LTE-Advance or LTE-a), more and more mobile operators select LTE/LTE-a as the Evolution direction of the broadband wireless communication system. MTC multi-type data services based on LTE/LTE-A will also be more attractive.

In the existing LTE/LTE-a system, a Primary Synchronization Signal/Secondary Synchronization Signal (PSS/SSS) and a Broadcast Channel (PBCH) are received by a terminal in a downlink direction first and are both located in the center of a system bandwidth. The LTE/LTE-a system scheduling scheme is based on dynamic scheduling of each subframe for transmission, i.e., each subframe can transmit different control channels. A Physical Downlink Control Channel (PDCCH) and an Enhanced Physical Downlink Control Channel (EPDCCH) are defined in LTE/LTE-a. Both PDCCH and EPDCCH may schedule and indicate a Physical Downlink Shared Channel (PDSCH) and a Physical Uplink Shared Channel (PUSCH) to transmit downlink and Uplink data information. Fig. 1 is a schematic diagram of each channel resource in an LTE/LTE-a system according to the related art, and as shown in fig. 1, the occupation situation of each channel resource in a downlink subframe of an existing LTE/LTE-a system is as follows: the PDCCH occupies the first several Orthogonal Frequency Division Multiplexing (OFDM) symbols of the full bandwidth, and the EPDCCH and the PDSCH occupy part of the bandwidth in a frequency division Multiplexing manner, that is, part of Physical Resource Block (PRB) resources are located on the OFDM symbols behind the PDCCH. The downlink control channel adopts blind detection, and the terminal tries to demodulate the downlink control channel in different aggregation levels and candidate sets in a certain search space. The existing search space is shown in table 1 and table 2, and the search space is composed of candidate sets corresponding to different aggregation levels, and is divided into a Common search space (CSS for short) and a user-specific search space (USS for short), and respectively corresponds to control information for scheduling cell Common information and control information for scheduling dedicated information. When the terminal demodulates the control channel, it needs to try to demodulate each candidate set until the demodulation is correct, otherwise, it considers that the control channel belonging to the terminal is not received.

The PDCCH search space is shown in table 1.

TABLE 1

The EPDCCH search space (USS) is shown in table 2.

TABLE 2

The PDCCH/EPDCCH is used for carrying Downlink Control Information (DCI), and includes: uplink and downlink scheduling information, and uplink power control information. Generally, an MTC terminal may obtain DCI by demodulating a PDCCH/EPDCCH channel in each subframe in order to obtain information required for demodulation of a PDSCH and scheduling indication information of a PUSCH.

In MTC application terminals, one significant requirement is lower cost. One of the current methods for reducing the cost is to reduce the receiving bandwidth of the MTC terminal, for example, in the LTE system, the normal terminal still uses the system bandwidth as the receiving bandwidth, and the MTC terminal uses 1.4MHz as the receiving bandwidth. When the MTC terminal uses the narrowband reception bandwidth, the total resource that can be used is very limited. When the narrow-band receiving bandwidth used by the MTC terminal is smaller than the system bandwidth, the PDCCH cannot work, and when the EPDCCH is used, since a synchronization signal and a broadcast channel can be received in a central bandwidth when the network is initially accessed, but the narrow-band location terminal that receives the cell common message and the corresponding control channel is not aware of it unless the system bandwidth is exactly equal to the narrow-band bandwidth supported by the MTC terminal. Therefore, when the system bandwidth is large, the narrowband position where the control channel and the corresponding traffic channel are located, which are required in the initial access, need to be determined. So as to ensure that the system bandwidth is fully used by the MTC terminal with reduced bandwidth.

Aiming at the problem that downlink information cannot be received in a bandwidth limited scene in the related technology, an effective solution is not provided at present.

Disclosure of Invention

The invention provides a downlink information sending method, a downlink information receiving method and a downlink information receiving device, which at least solve the problem that downlink information cannot be received in a bandwidth limited scene in the prior art.

According to an aspect of the present invention, a downlink information sending method is provided, including: grouping channels bearing different downlink information; and allocating the grouped channels to the narrow-band resources for transmission.

Further, allocating the grouped channels to the narrowband resource for transmission comprises at least one of: and allocating the channels in the same group to the same narrow-band resource for transmission, and allocating the channels in different groups to different time-domain resources in the same narrow-band resource for transmission.

Further, the time domain resource includes at least one of the following units: subframe, field, radio frame.

Further, the narrowband resource is a resource of N narrowbands partitioned in the system broadband, where N is greater than or equal to 1.

Further, each of the narrowband resources is: 5 physical resource blocks PRB, 6PRB, 15PRB, or 25 PRB.

Further, the downlink information includes at least one of: synchronization information, broadcast information, cell public information, downlink user specific information, control information for scheduling cell public information, control information for scheduling downlink user specific information, control information for scheduling uplink user specific information.

Further, allocating the grouped channels to the narrowband resource for transmission comprises at least one of: the channel carrying the synchronization information and/or the broadcast information is sent on the narrow band of the system bandwidth center; transmitting at least one of the following on the narrowband resource determined by the signaling configuration or the predefined mode: the channel of the control information of the load cell public information, the downlink user special information, the control information of the scheduling cell public information, the control information of the scheduling downlink user special information and the control information of the scheduling uplink user special information.

Further, the signaling configuration includes at least one of: broadcast signaling, system message signaling, physical layer signaling; the predefined mode comprises determining available narrow bands for transmitting one or more of cell public information, downlink user specific information, control information for scheduling cell public information, control information for scheduling downlink user specific information and control information for scheduling uplink user specific information.

Further, the same group includes a channel carrying cell public information, downlink user specific information, control information for scheduling cell public information, control information for scheduling downlink user specific information, and/or control information for scheduling uplink user specific information, and the channel is transmitted on different predefined narrowband resources indicated by narrowband allocation information included in the broadcast information, where the cell public information transmitted on different narrowband resources is different.

Further, the differences of the cell public messages include: the method comprises the following steps of sharing the same type of common messages of the cells with the same content and different contents, or sharing the common messages of the cells with different types, wherein the types comprise: SIB, RAR, or Paging.

Further, independent channels carrying synchronization information and/or broadcast information can be transmitted on different narrowband resources.

Further, the same group includes a channel carrying control information of the cell public information and the scheduling cell public information, or the same group includes a channel carrying control information of the downlink user specific information and the scheduling user specific information, and the channel is transmitted on different predefined narrowband resources or narrowband allocation information indication included in the broadcast information.

Furthermore, the same group comprises a channel for bearing control information of public information of a scheduling cell and control information of private information of a scheduling user, and the control information is transmitted in a central narrow band; or, in the case that the broadcast information includes narrowband allocation information indicating the packet, transmitting on a narrowband resource indicated by the narrowband allocation information or transmitting on a predefined narrowband; channels carrying cell common information and/or downlink user specific information are included in the same group and are transmitted on the narrowband resources indicated by the control channel scheduling.

Further, the same group includes a channel for carrying control information of the cell public message, the scheduling cell public information and the scheduling user private information, or the same group includes a channel for carrying control information of the cell public message, the user private message, the scheduling cell public information and the scheduling user private information, and the channels are transmitted on the central narrow band; or, in the case that the broadcast information includes the packet narrowband allocation information, transmitting on a narrowband resource indicated by the narrowband allocation information or transmitting on a predefined narrowband; and the channel which carries the cell public information and the user special information is included in the same group, or the channel which only carries the cell public information is included in the same group, and the channel is transmitted on the narrow-band resource indicated by the control channel scheduling.

Further, the channels carrying all downlink information are transmitted on the same narrowband resource.

Further, when the information in the packet is transmitted in a narrow band with non-central system bandwidth, the number of used narrow band resources is greater than or equal to 1.

Further, the search space of the channel carrying the control information for scheduling the downlink user specific information is determined by a predefined or fixed or signaling notification mode before the RRC connection is established.

Further, the signaling is carried in a system information block SIB or a random access response RAR, wherein the signaling bit field only indicates content other than predefined parameters.

Further, the search space of the channel carrying the control information of the scheduling downlink user specific information is the same for different users, wherein the same search space includes: the user-specific search space and the public search space are completely overlapped, or the user-specific search space before the RRC connection is established is the same.

Further, after the search space is determined, a user-specific search space of each user equipment UE is implicitly allocated to the user equipment UE by using predetermined parameters.

Further, the determining of the user-specific search space comprises: the method is determined by selecting the narrow-band resources first and then selecting the PRBs in the narrow-band resources, or directly selecting the PRBs in the full bandwidth.

Further, the search space in which the channel carrying the control information of the scheduling downlink user specific information is located is only a user specific search space and is configured and determined in the same manner before and after the RRC connection is established, wherein the same manner is a predefined or fixed manner.

Further, when the control information for scheduling the downlink user specific information or the control information for scheduling the cell public information indicates the frequency domain resource occupied by the downlink user specific information or the cell public information, a first part of one bit field or one bit field is used for indicating the narrowband occupation information, and a second part of the other bit field or one bit field is used for indicating the PRB occupation information in the narrowband.

Further, when the control information for scheduling the uplink user specific information indicates the frequency domain resource of the narrowband where the uplink user specific information is located, the control information at least includes a complete Sounding Reference Signal (SRS).

Further, the control information of the scheduling user specific information determines the RA domain according to the number of PRBs corresponding to the maximum system bandwidth, or the control information determines the RA domain according to the number of PRBs corresponding to the current system bandwidth, or the control information determines the RA domain according to the number of PRBs corresponding to the maximum bandwidth received by the user equipment.

Further, when the control information for scheduling the user-specific information or the control information for scheduling the cell public information indicates the time domain subframe resource occupied by the user-specific information or the cell public information, a bit field is used to indicate the offset number of the subframe corresponding to the control information.

Further, the allocation of the narrow bands is configured for a low-cost MTC terminal and a coverage-enhanced MTC terminal, respectively, where all channels in each group of the low-cost MTC terminal and the coverage-enhanced MTC terminal use different narrow bands, or a part of channels in each group of the low-cost MTC terminal and the coverage-enhanced MTC terminal use different narrow bands.

Further, a pilot used by a channel carrying the broadcast information, the cell public information, the user-specific information, the control information for scheduling the cell public information, and the control information for scheduling the user-specific information is a demodulation reference signal DMRS, and when a cell-specific pilot CRS is used in combination, one of the following ways is adopted: the DMRS pilot frequency does not add precoding, and the information in the channel using the DMRS pilot frequency does not add precoding; the DMRS pilot uses a predefined precoding, and information in a channel using the DMRS pilot uses the predefined precoding; the DMRS pilot uses precoding, and the user specific information in the data channel using the DMRS pilot uses the precoding, wherein the precoding information is indicated by scheduling control information of the user specific information.

Further, a mapping relationship exists between the CRS port and the DMRS port, wherein the mapping relationship is calculated at least according to a port mapping matrix.

Further, when the used pilots are DMRSs, a time division multiplexing mode is adopted when CRS is used jointly, some subframes only use DMRS pilots, and the rest subframes only use CRS pilots or use DMRS and CRS pilots simultaneously.

According to another aspect of the embodiments of the present invention, there is also provided a downlink information receiving method, including: when receiving the downlink information, grouping and receiving channels carrying different downlink information on the narrowband resources.

Further, the grouping reception of the channels carrying different downlink information on the narrowband resource includes at least one of: channels within the same packet are received on the same narrowband resources and channels within different packets are received on different time domain resources in the same narrowband resources.

Further, the narrowband resource is a resource of N narrowbands partitioned in the system bandwidth, where N is greater than or equal to 1.

Further, each of the narrowband resources is 5PRB, 6PRB, 15PRB, or 25 PRB.

Further, the grouping reception of the channels carrying different downlink information on the narrowband resource includes at least one of the following: receiving a downlink channel carrying synchronization information and/or broadcast information at least on a narrow band of a system bandwidth center at a certain period or predefined subframes; the narrowband used by at least one of the channels for carrying the cell public information, the downlink user special information, the control information of the scheduling cell public information, the control information of the scheduling downlink user special information and the control information of the scheduling uplink user special information is determined by a signaling configuration or a predefined mode.

Further, the signaling configuration includes at least one of: broadcast signaling, system message signaling, physical layer signaling; the predefined manner includes determining available narrowbands for reception of one or more of cell public information, downlink user specific information, control information for scheduling cell public information, control information for scheduling downlink user specific information, and control information for scheduling uplink user specific information.

Further, the same group includes a channel carrying cell public information, downlink user specific information, control information of scheduling cell public information, control information of scheduling downlink user specific information, and/or control information of scheduling uplink user specific information, and is received according to narrow band allocation information included in the broadcast information or on predefined different narrow band resources, where the cell public information received on different narrow band resources is different.

Further, the differences of the cell public messages include: the method comprises the following steps of (1) sharing messages with the same type and different contents in cells or sharing messages with different types in cells, wherein the types comprise: SIB, RAR, or Paging.

Further, independent channels carrying synchronization information and/or broadcast information can be received on different narrowband resources.

Further, the same group includes a channel carrying control information of the cell public information and the scheduling cell public information, or the same group includes a channel carrying control information of the downlink user specific information and the scheduling user specific information, and receives the control information on different narrowband resources indicated or predefined by the narrowband allocation information included in the broadcast information.

Further, the same group includes a channel carrying control information of scheduling cell public information and control information of scheduling user private information, which is received in a central narrow band, or when broadcast information includes indication of the group of narrow band allocation information, the broadcast information is received according to the indication of the narrow band allocation information or received in a predefined narrow band; and the channels containing the common information of the bearing cells and/or the special information of the downlink users in the same group are received on the narrow-band resources indicated by the control channel scheduling.

Further, the same group contains channels for carrying control information of the cell public message, the scheduling cell public message and the scheduling user private message, or the same group contains channels for carrying control information of the cell public message, the downlink user private message, the scheduling cell public message and the scheduling user private message, which are received in a central narrow band; or, when the broadcast information contains the group of narrowband allocation information, receiving according to the indication of the narrowband allocation information or receiving in a predefined narrowband; and receiving the channel which contains the public information of the bearing cell and the special information of the downlink user in the same group, or only containing the public information of the bearing cell in the same group on the narrow-band resource indicated by the control channel scheduling.

Further, the channels carrying all downlink information are received within the same narrowband.

Further, the search space where the channel carrying the control information of the scheduling downlink user specific information is located is determined by a predefined or fixed or signaling notification mode before the RRC connection is established.

Further, the signaling is carried in a SIB or RAR, wherein the signaling bit field indicates only content other than predefined parameters.

Further, after the search space is determined, the user-specific search space of each user equipment is implicitly determined through predetermined parameters.

Further, when the control information of the scheduling downlink user specific information or the control information of the scheduling cell public information indicates the frequency domain resource occupied by the downlink user specific information or the cell public information, the narrow band occupation information is indicated by using one bit field or the first part of the bit field, and the specific PRB occupation information in the narrow band is indicated by using the other bit field or the second part of the bit field.

Further, when the control information of the uplink user specific information is scheduled to indicate the frequency domain resource of the narrow band where the uplink user specific information is located, at least one complete SRS is included,

Further, when the control information of the scheduling user specific information or the control information of the scheduling cell public information indicates the time domain subframe resource occupied by the user specific information or the cell public information, a bit field is used to indicate the offset number of the subframe corresponding to the control information.

Further, the pilot used by the channel carrying the broadcast information, the cell public information, the user specific information, the control information of the scheduling cell public information, and the control information of the scheduling user specific information is DMRS, and when the CRS is used jointly, one of the following modes is adopted: the DMRS pilot frequency does not add precoding, and simultaneously, information in a channel using the pilot frequency does not add precoding; the DMRS pilot uses predefined precoding, and information in a channel using the pilot also uses the predefined precoding; the DMRS pilot uses precoding, while the user-specific information in the data channel using the pilot also uses precoding, while the precoding information is indicated by scheduling control information of the user-specific information.

According to another aspect of the present invention, there is also provided a downlink information transmitting apparatus, including: the grouping module is used for grouping channels bearing different downlink information; and the transmission module is used for distributing the grouped channels to the narrow-band resources for transmission.

Further, the transmission module comprises at least one of: the first transmission unit is used for distributing the channels in the same group to the same narrow-band resource for transmission; and the second transmission unit is used for allocating the channels in different groups to different time domain resources in the same narrow-band resource for transmission.

Further, the transmission module includes: a third transmission unit, configured to send a channel carrying synchronization information and/or broadcast information on a narrowband in a system bandwidth center; determining a transmission unit for transmitting at least one of the following on the narrowband resource determined by the signaling configuration or the predefined manner: the channel of the control information of the load cell public information, the downlink user special information, the control information of the scheduling cell public information, the control information of the scheduling downlink user special information and the control information of the scheduling uplink user special information.

According to another aspect of the present invention, there is also provided a downlink information receiving apparatus, including: and the receiving module is used for grouping and receiving channels carrying different downlink information on the narrow-band resources when receiving the downlink information.

According to the invention, the channels carrying different downlink information are grouped, and the grouped channels are distributed to the narrow-band resource for transmission, so that the problem that the downlink information cannot be received in the scene of limited bandwidth in the related technology is solved, and the correct reception of the downlink information is ensured.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

fig. 1 is a diagram of channel resources in an LTE/LTE-a system according to the related art;

fig. 2 is a flowchart of a downlink information transmitting method according to an embodiment of the present invention;

fig. 3 is a block diagram of a downlink information transmitting apparatus according to an embodiment of the present invention;

fig. 4 is a first block diagram of a downlink information transmitting apparatus according to a preferred embodiment of the present invention;

fig. 5 is a block diagram ii of a downlink information transmitting apparatus according to a preferred embodiment of the present invention;

fig. 6 is a first schematic diagram of downlink transmission information packets transmitted in different narrow bands according to the preferred embodiment of the present invention;

fig. 7 is a second schematic diagram of transmitting downlink transmission information packets in different narrow bands according to the preferred embodiment of the present invention;

fig. 8 is a third schematic diagram of grouping downlink transmission information into different narrowband transmissions according to the preferred embodiment of the present invention;

fig. 9 is a fourth schematic diagram of downlink transmission information packets transmitted in different narrow bands according to the preferred embodiment of the present invention;

fig. 10 is a fifth schematic diagram of grouping downlink transmission information into different narrow-band transmissions according to the preferred embodiment of the present invention.

Detailed Description

The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

In this embodiment, a downlink information sending method is provided, and fig. 2 is a flowchart of a downlink information sending method according to an embodiment of the present invention, as shown in fig. 2, the flowchart includes the following steps:

step S202, grouping channels bearing different downlink information;

step S204, allocating the grouped channel to the narrow-band resource for transmission.

Through the steps, after the channels carrying different downlink information are grouped, the grouped channels are distributed to the narrow-band resource for transmission under the scene of bandwidth limitation, so that the problem that the downlink information cannot be received under the scene of bandwidth limitation in the prior art is solved, and the correct reception of the downlink information is ensured.

There are many ways to allocate the grouped channels to the narrowband resources, and in an alternative embodiment, allocating the grouped channels to the narrowband resources for transmission may include at least one of: and allocating the channels in the same group to the same narrow-band resource for transmission, and allocating the channels in different groups to different time-domain resources in the same narrow-band resource for transmission. Wherein the time domain resource comprises at least one of the following units: subframe, field, radio frame. The narrowband resource is a resource of N narrowbands divided in the system broadband, wherein N is more than or equal to 1. Each of the narrowband resources is: 5 physical resource blocks PRB, 6PRB, 15PRB, or 25 PRB. The downlink information includes at least one of: synchronization information, broadcast information, cell public information, downlink user specific information, control information for scheduling cell public information, control information for scheduling downlink user specific information, control information for scheduling uplink user specific information.

In another alternative embodiment, allocating the grouped channel to the narrowband resource for transmission may include at least one of: the channel carrying the synchronization information and/or the broadcast information is sent on the narrow band of the system bandwidth center; transmitting at least one of the following on the narrowband resource determined by the signaling configuration or the predefined mode: the channel of the control information of the load cell public information, the downlink user special information, the control information of the scheduling cell public information, the control information of the scheduling downlink user special information and the control information of the scheduling uplink user special information.

The above signaling configuration may be implemented in various ways, and in an alternative embodiment, the signaling configuration may include at least one of the following: broadcast signaling, system message signaling, physical layer signaling; the predefined manner includes determining available narrowbands for transmission of one or more of cell public information, downlink user specific information, control information for scheduling cell public information, control information for scheduling downlink user specific information, and control information for scheduling uplink user specific information.

The following describes how to allocate the grouped channels to the narrowband resource for transmission.

The method comprises the steps of carrying a channel of cell public information, downlink user proprietary information, control information of scheduling cell public information, control information of scheduling downlink user proprietary information and/or control information of scheduling uplink user proprietary information in the same group, and sending the channel on different predefined narrow-band resources indicated by narrow-band allocation information contained in broadcast information, wherein the cell public information sent on the different narrow-band resources is different. Wherein the difference of the cell public messages comprises: the method comprises the following steps of sharing the same type of common messages of the cells with the same content and different contents, or sharing the common messages of the cells with different types, wherein the types comprise: SIB, RAR, or Paging. Separate channels carrying synchronization information and/or broadcast information can be transmitted on different ones of the narrowband resources.

The same group comprises a channel for bearing control information of cell public information and scheduling cell public information, or the same group comprises a channel for bearing control information of downlink user special information and scheduling user special information, and the control information is sent on different predefined narrow-band resources or narrow-band allocation information indication contained in broadcast information.

The same group comprises channels for bearing control information of public information of a scheduling cell and control information of private information of a scheduling user, and the channels are transmitted in a central narrow band; or, in case that the broadcast information includes narrowband allocation information indicating the packet, transmitting on a narrowband resource indicated by the narrowband allocation information or transmitting on a predefined narrowband; channels carrying cell common information and/or downlink user specific information are included in the same group and are transmitted on the narrowband resources indicated by the control channel scheduling.

The same group comprises channels for bearing control information of the community public information, the scheduling community public information and the scheduling user special information, or the same group comprises channels for bearing control information of the community public information, the user special information, the scheduling community public information and the scheduling user special information, and the channels are sent on a central narrow band; or, in case that the broadcast information includes the packet narrowband allocation information, transmitting on a narrowband resource indicated by the narrowband allocation information or transmitting on a predefined narrowband; and the channel which carries the cell public information and the user special information is included in the same group, or the channel which only carries the cell public information is included in the same group, and the channel is transmitted on the narrow-band resource indicated by the control channel scheduling.

When the channel carries all the downlink information, the downlink information is transmitted on the same narrowband resource, that is, the channel carrying all the downlink information is transmitted on the same narrowband resource.

In the above-described aspect, when information in a packet is transmitted in a narrowband whose system bandwidth is not centered, the number of narrowband resources used is 1 or more. The search space of the channel for carrying the control information for scheduling the downlink user proprietary information is determined by a predefined or fixed or signaling notification mode before the RRC connection is established. This signaling is carried in a system information block SIB or a random access response RAR, wherein the signaling bit field only indicates content other than predefined parameters. The search space of the channel carrying the control information of the scheduling downlink user specific information is the same for different users, wherein the same search space comprises: the user-specific search space and the public search space are completely overlapped, or the user-specific search space before the RRC connection is established is the same. After the search space is determined, a user-specific search space of the user equipment is implicitly allocated to each user equipment UE through a predetermined parameter. The determination of the user-specific search space may be performed in a variety of manners, and in an alternative embodiment, the determination of the user-specific search space may include: the method is determined by selecting the narrow-band resources first and then selecting the PRBs in the narrow-band resources, or directly selecting the PRBs in the full bandwidth.

The search space of the channel carrying the control information of the scheduling downlink user-specific information is only the user-specific search space and is configured and determined in the same way before and after the RRC connection is established, wherein the same way is a predefined or fixed way. When the control information for scheduling the downlink user specific information or the control information for scheduling the cell public information indicates the frequency domain resources occupied by the downlink user specific information or the cell public information, a first part of one bit field or one bit field is used for indicating the narrow-band occupation information, and a second part of the other bit field or one bit field is used for indicating the PRB occupation information in the narrow band. When the control information for scheduling the uplink user specific information indicates the frequency domain resource of the narrow band where the uplink user specific information is located, the control information at least comprises a complete SRS, wherein no matter what the system bandwidth is, the control information for scheduling the user specific information determines the RA domain according to the number of PRBs corresponding to the maximum system bandwidth, or the control information determines the RA domain according to the number of PRBs corresponding to the current system bandwidth, or the control information determines the RA domain according to the number of PRBs corresponding to the maximum bandwidth received by the user equipment. And when the control information for scheduling the user-specific information or the control information for scheduling the cell public information indicates the time domain subframe resources occupied by the user-specific information or the cell public information, using a bit field to indicate the offset number of the subframe corresponding to the control information.

The allocation of the narrow bands is configured for a low-cost MTC terminal and a coverage enhancement MTC terminal respectively, wherein all channels in each group of the low-cost MTC terminal use different narrow bands with the coverage enhancement MTC terminal, or part of channels in each group of the low-cost MTC terminal use different narrow bands with the coverage enhancement MTC terminal.

The pilot used by the channel for carrying the broadcast information, the cell public information, the user specific information, the control information for scheduling the cell public information and the control information for scheduling the user specific information is a demodulation reference signal (DMRS), and one of the following modes is adopted when the cell specific pilot is used in combination with a cell specific pilot (CRS): the DMRS pilot frequency does not add precoding, and information in a channel using the DMRS pilot frequency does not add precoding; the DMRS pilot uses a predefined precoding, and information in a channel using the DMRS pilot uses the predefined precoding; the DMRS pilot uses precoding, which is used by the user-specific information in the data channel using the DMRS pilot, wherein the precoding information is indicated by scheduling control information of the user-specific information. And a mapping relation exists between the CRS port and the DMRS port, wherein the mapping relation is calculated at least according to the port mapping matrix. When the used pilot frequency is DMRS, a time division multiplexing mode is adopted when CRS is jointly used, part of subframes only use the DMRS pilot frequency, and the rest subframes only use the CRS pilot frequency or use the DMRS and the CRS pilot frequency simultaneously.

The embodiment of the invention also provides a downlink information receiving method, which comprises the following steps: when receiving the downlink information, grouping and receiving channels carrying different downlink information on the narrowband resources.

There may be many ways to receive channels carrying different downlink information in packets on the narrowband resource, and in an alternative embodiment, the receiving channels carrying different downlink information in packets on the narrowband resource may include at least one of: channels within the same packet are received on the same narrowband resources and channels within different packets are received on different time domain resources in the same narrowband resources. Wherein the time domain resource comprises at least one of the following units: subframe, field, radio frame. The narrowband resource is a resource in N narrowbands partitioned from the system bandwidth, wherein N is greater than or equal to 1. Each of the narrowband resources is 5PRB, 6PRB, 15PRB, or 25 PRB. The downlink information includes at least one of: synchronization information, broadcast information, cell public information, downlink user specific information, control information for scheduling cell public information, control information for scheduling downlink user specific information, control information for scheduling uplink user specific information.

In another optional embodiment, the packet reception of the channels carrying different downlink information on the narrowband resource includes at least one of: receiving a downlink channel carrying synchronization information and/or broadcast information at least on a narrow band of a system bandwidth center at a certain period or predefined subframes; the narrowband used by at least one of the channels for carrying the cell public information, the downlink user special information, the control information of the scheduling cell public information, the control information of the scheduling downlink user special information and the control information of the scheduling uplink user special information is determined by a signaling configuration or a predefined mode.

The above-mentioned signaling configuration may include at least one of: broadcast signaling, system message signaling, physical layer signaling; the predefined manner includes determining available narrowbands for reception of one or more of cell public information, downlink user specific information, control information for scheduling cell public information, control information for scheduling downlink user specific information, and control information for scheduling uplink user specific information.

And the same group comprises channels for bearing cell public messages, downlink user proprietary information, control information of scheduling cell public information, control information of scheduling downlink user proprietary information and/or control information of scheduling uplink user proprietary information, and the channels are received on different predefined narrow-band resources according to narrow-band allocation information contained in the broadcast information, wherein the cell public messages received on the different narrow-band resources are different. The differences of the cell public messages include: the method comprises the following steps of (1) sharing messages with the same type and different contents in cells or sharing messages with different types in cells, wherein the types comprise: SIB, RAR, or Paging. Separate channels carrying synchronization information and/or broadcast information can be received on different ones of the narrowband resources.

And the same group contains channels for bearing control information of the cell public information and the scheduling cell public information, or the same group contains channels for bearing control information of the downlink user special information and the scheduling user special information, and the channels are received on different narrow-band resources indicated by or predefined by the narrow-band allocation information contained in the broadcast information.

The same group of channels including control information for bearing public information of the scheduling cell and control information for special information of the scheduling user are received in a central narrow band, or when the broadcast information contains indication of the group of narrow band distribution information, the broadcast information is received according to the indication of the narrow band distribution information or received in a predefined narrow band; and the channels containing the common information of the bearing cells and/or the special information of the downlink users in the same group are received on the narrow-band resources indicated by the control channel scheduling.

The same group of channels containing the control information of the bearing cell public information, the control information of the scheduling cell public information and the control information of the scheduling user private information, or the same group of channels containing the control information of the bearing cell public information, the downlink user private information, the control information of the scheduling cell public information and the control information of the scheduling user private information is received in a central narrow band; or, when the broadcast information contains the group of narrowband allocation information, receiving according to the indication of the narrowband allocation information or receiving in a predefined narrowband; and receiving the channel which contains the public information of the bearing cell and the special information of the downlink user in the same group, or only containing the public information of the bearing cell in the same group on the narrow-band resource indicated by the control channel scheduling.

When the channel carries all the downlink information, the downlink information is received in the same narrow band, that is, the channel carrying all the downlink information is received in the same narrow band.

In the above several modes, when the information in the packet is transmitted in a narrowband with non-central system bandwidth, the number of the used narrowband resources is greater than or equal to 1. The search space of the channel carrying the control information of the scheduling downlink user proprietary information is determined by a predefined or fixed or signaling notification mode before the RRC connection is established. The signaling is carried in a SIB or RAR, where the signaling bit field only indicates content other than predefined parameters.

The search space of the channel carrying the control information for scheduling the downlink user specific information is the same for different users, wherein the same search space comprises: the user-specific search space and the public search space are completely overlapped, or the user-specific search space before the RRC connection is established is the same. After the search space is determined, the user-specific search space for each user device is implicitly determined by predetermined parameters. Wherein the determining of the user-specific search space comprises: the method is determined by selecting the narrow-band resources first and then selecting the PRBs in the narrow-band resources, or directly selecting the PRBs in the full bandwidth. The search space of the channel carrying the control information of the downlink scheduling user-specific information is only the user-specific search space and is configured and determined in the same manner before and after the establishment of the RRC connection, wherein the same manner is a predefined or fixed manner.

When the control information of the downlink user specific information or the control information of the scheduling cell public information indicates the frequency domain resources occupied by the downlink user specific information or the cell public information, the first part of one bit field or one bit field is used for indicating the narrow band occupation information, and the second part of the other bit field or one bit field indicates the specific PRB occupation information in the narrow band. When the control information for scheduling the uplink user specific information indicates the frequency domain resource of the narrow band where the uplink user specific information is located, the control information at least comprises a complete SRS, wherein the control information for scheduling the user specific information determines an RA domain according to the number of PRBs corresponding to the maximum system bandwidth, or the control information determines the RA domain according to the number of PRBs corresponding to the current system bandwidth, or the control information determines the RA domain according to the number of PRBs corresponding to the maximum bandwidth received by user equipment. When the control information of the scheduling user specific information or the control information of the scheduling cell public information indicates the time domain subframe resources occupied by the user specific information or the cell public information, a bit field is used for indicating the offset number of the subframe corresponding to the control information. The allocation of the narrow bands is configured for a low-cost MTC terminal and a coverage enhancement MTC terminal respectively, wherein all channels in each group of the low-cost MTC terminal use different narrow bands with the coverage enhancement MTC terminal, or part of channels in each group of the low-cost MTC terminal use different narrow bands with the coverage enhancement MTC terminal.

The pilot frequency used by the channel for bearing the broadcast information, the community public information, the user special information, the control information of the scheduling community public information and the control information of the scheduling user special information is DMRS, and one of the following modes is adopted when CRS is used in a combined mode: the DMRS pilot frequency does not add precoding, and simultaneously, information in a channel using the pilot frequency does not add precoding; the DMRS pilot uses predefined precoding, and information in a channel using the pilot also uses the predefined precoding; the DMRS pilot uses precoding, while the user-specific information in the data channel using the pilot also uses precoding, while the precoding information is indicated by scheduling control information of the user-specific information. And a mapping relation exists between the CRS port and the DMRS port, wherein the mapping relation is calculated at least according to the port mapping matrix. And when the used pilot frequency is the DMRS, a time division multiplexing mode is adopted when the CRS is jointly used, part of subframes only use the DMRS pilot frequency, and the rest subframes only use the CRS pilot frequency or simultaneously use the DMRS and the CRS pilot frequency.

The embodiment of the present invention further provides a sending processing apparatus, which is used to implement the foregoing embodiments and preferred embodiments, and the descriptions already given are omitted here. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.

Fig. 3 is a block diagram of a downlink information transmitting apparatus according to an embodiment of the present invention, as shown in fig. 3, including: a grouping module 32 and a transmission module 34, each of which is briefly described below.

A grouping module 32, configured to group channels carrying different downlink information;

and a transmission module 34, configured to allocate the grouped channels to the narrowband resource for transmission.

Fig. 4 is a first block diagram of a downlink information sending apparatus according to a preferred embodiment of the present invention, and as shown in fig. 4, the transmission module 34 includes at least one of the following components:

a first transmission unit 42, configured to allocate channels in the same packet to the same narrowband resource for transmission;

and a second transmission unit 44, configured to allocate channels in different packets to different time domain resources in the same narrowband resource for transmission.

Fig. 5 is a block diagram ii of a downlink information transmitting apparatus according to a preferred embodiment of the present invention, and as shown in fig. 5, the transmission module 34 includes:

a third transmission unit 52, configured to send a channel carrying synchronization information and/or broadcast information on a narrowband in the center of the system bandwidth;

a determining transmission unit 54, configured to transmit at least one of the following on the narrowband resource determined by the signaling configuration or the predefined manner: the channel of the control information of the load cell public information, the downlink user special information, the control information of the scheduling cell public information, the control information of the scheduling downlink user special information and the control information of the scheduling uplink user special information.

An embodiment of the present invention further provides a downlink information receiving apparatus, including: and the receiving module is used for grouping and receiving channels carrying different downlink information on the narrow-band resources when receiving the downlink information.

The following examples are presented to further illustrate the invention in connection with alternative embodiments.

In order to solve the problem of effective transmission of downlink signals in a scene with limited bandwidth, the optional embodiment provides a method suitable for a narrowband system to transmit different channel groups, mainly solving the problem of resource usage when different signals in the narrowband system are subjected to downlink transmission, and ensuring the normal communication requirement of terminal equipment working in the narrowband system.

When the base station sends the downlink information, grouping channels bearing different downlink information, and allocating the channels in the same group to the same narrow-band resource for transmission, or allocating the channels in different groups to different time-domain resources in the same narrow-band resource for transmission. Wherein, the downlink information at least comprises one of the following information: synchronization information, broadcast information, cell public information, user specific information, control information for scheduling cell public information, control information for scheduling user specific information. The narrowband resource is a resource in N narrowbands partitioned in the system bandwidth, and the resource in each narrowband is preferably 6PRB, 15PRB, and 25 PRB. Wherein the time domain resource at least comprises the following units: subframe, field, radio frame. Allocating channels in the same group to the same narrowband resource for transmission, or allocating channels in different groups to different time domain resources in the same narrowband resource for transmission further comprises: the terminal receives a downlink channel carrying synchronous and/or broadcast information at least on a narrow band of a system bandwidth center at a certain period or a predefined subframe, and the narrow band used by the channel carrying cell public information, user-specific information, control information of scheduling cell public information and control information of scheduling user-specific information is determined by a signaling configuration or a predefined mode.

The transmission is performed on the narrowband resources in several ways, as further described below.

When the broadcast information contains narrow-band allocation information, the same group contains channels for bearing cell public information, user special information, control information of scheduling cell public information and control information of scheduling user special information, and the channels are sent on different narrow-band resources indicated by the narrow-band allocation information, wherein the cell public information sent on different narrow-band resources is different.

When the broadcast information contains the narrow-band allocation information, the same group contains channels carrying control information of the cell public information and the scheduling cell public information, or the same group contains channels carrying control information of the user special information and the scheduling user special information, and the channels are sent according to different narrow-band resources indicated by the narrow-band allocation information.

And a channel containing control information for bearing public information of the scheduling cell and control information for special information of the scheduling user in the same group is sent according to the indication of the narrow-band distribution information when the central narrow-band is sent or the broadcast information contains the narrow-band distribution information indicating the group. And the same group comprises channels for bearing cell public information and user special information, and the used narrow-band resources are indicated by control channel scheduling.

The channel containing the control information of the bearing district public information, the control information of the dispatching district public information and the control information of the dispatching user special information in the same group, or the channel containing the control information of the bearing district public information, the user special information, the control information of the dispatching district public information and the control information of the dispatching user special information in the same group is sent according to the indication of the narrow-band distribution information when the central narrow-band is sent or the broadcast information contains the narrow-band distribution information in the group. And the same group contains channels for bearing cell public information and user-specific information, or the same group contains channels for bearing user-specific information only, or the same group contains channels for bearing cell public information only, and the used narrow-band resources are indicated by control channel scheduling.

When the channel includes all the downlink information, the channels carrying all the downlink information are all transmitted in the same narrow band.

The search space of the channel carrying the control information of the scheduling user-specific information is determined by a predefined or fixed or signaling notification mode before the RRC connection is established, and the signaling is carried in the SIB or the RAR. The search space of the channel for bearing the control information of the scheduling user-specific information is determined in a predefined or fixed mode to simultaneously contain the UE-specific search space and the public search space, and the areas are completely overlapped. After the search space is determined, the base station implicitly maps each UE with some parameters, such as UE ID, to obtain a search space specific to each UE.

The search space of the channel carrying the control information of the scheduling user-specific information is only the user-specific search space and is determined by a predefined or fixed mode before and after the RRC connection is established.

When the control information of the scheduling user specific information or the control information of the scheduling cell public information indicates the frequency domain resources occupied by the user specific information or the cell public information, the first part of one bit field or one bit field is used for indicating the narrow band occupation information, and the second part of the other bit field or one bit field indicates the specific PRB occupation information in the narrow band.

When the control information of the scheduling user specific information or the control information of the scheduling cell public information indicates the time domain subframe resources occupied by the user specific information or the cell public information, a bit field is used for indicating the offset number of the subframe corresponding to the control information.

The narrowband allocation may be configured separately for low cost MTC terminals and coverage enhanced MTC terminals.

The pilot frequency used by the channel for bearing the cell public information, the user specific information, the control information of the scheduling cell public information and the control information of the scheduling user specific information is DMRS, and when the CRS is used jointly, one of the following modes is adopted: the DMRS pilot frequency does not add precoding, and simultaneously, information in a channel using the pilot frequency does not add precoding; the DMRS pilot uses a predefined open-loop MIMO precoding, while information in the channel using the pilot also uses a predefined open-loop MIMO precoding; the DMRS pilot uses closed-loop MIMO precoding, while user-specific information in the data channel using the pilot also uses closed-loop MIMO precoding, while the precoding information is indicated by control information that schedules the user-specific information.

Through the optional embodiment, the problem of using downlink resources of the MTC terminal working in a part of narrow bands in the system bandwidth can be solved, the base station is ensured to serve as many terminals as possible and normally transmit data, and meanwhile, the problem of fuzzy search space exclusive to an initial user and the problem of improving transmission performance by jointly using different pilot frequencies can be solved.

When the base station sends the downlink information, grouping channels bearing different downlink information, and allocating the channels in the same group to the same narrow-band resource for transmission, or allocating the channels in different groups to different time-domain resources in the same narrow-band resource for transmission. Wherein the downlink information at least comprises one of the following information: synchronization information, broadcast information, cell public information, user specific information, control information for scheduling cell public information, control information for scheduling user specific information. The narrowband resource is a resource in N narrowbands partitioned in the system bandwidth, and the resource in each narrowband is preferably 5PRB, 6PRB, 15PRB and 25 PRB. Specifically, when the narrowband resource is divided in the system bandwidth resource, the PRB resource with the system bandwidth edge less than the number may be merged with the secondary edge narrowband or may be individually changed into a small narrowband less than the number or discarded as a guard band with a fixed narrowband resource division, such as 5PRB, 6PRB, 15PRB, and 25PRB, which are preferable. Wherein the time domain resource comprises at least the following units: subframe, field, radio frame.

Allocating the channels in the same group to the same narrow-band resource for transmission, or allocating the channels in different groups to different time-domain resources in the same narrow-band resource for transmission, further comprises that the terminal receives a downlink channel carrying synchronization and/or broadcast information at least on a system bandwidth center narrow-band at a certain period or predefined subframes, and the narrow-band used by the channel carrying cell public information, user-specific information, control information of scheduling cell public information and control information of scheduling user-specific information is determined by signaling configuration or a predefined mode.

The terminal receives a downlink channel carrying synchronization and/or broadcast information at least on a narrowband in the center of a system bandwidth at a certain period or a predefined subframe, for example, the synchronization and broadcast channels on the narrowband in the centers of subframes 0 and 5 in a wireless frame are received at a periodic interval of 400ms, and other information can be received at the same narrowband position in the next 400ms period; or the synchronization and broadcast channels in the narrow bands in the centers of sub-frames 0 and 5 in the odd radio frames are predefined to be received, and other information can be received at the same narrow band position in the even radio frames. The narrow band used by the channel for bearing the control information of the community public information, the user specific information, the control information of the scheduling community public information and the control information of the scheduling user specific information is determined by a signaling configuration or a predefined mode, wherein the signaling configuration comprises a broadcast signaling, a system message signaling and a physical layer signaling; the predefined manner includes determining certain available narrow bands for transmission of one or more of the information therein.

Fig. 6 is a first schematic diagram of grouping downlink transmission information in different narrow-band transmissions according to a preferred embodiment of the present invention, as shown in fig. 6, when broadcast information includes narrow-band allocation information, a channel in the same group includes control information carrying cell common information, user-specific information, scheduling cell common information, and scheduling user-specific information, and is transmitted according to different narrow-band resources indicated by the narrow-band allocation information, where the cell common information transmitted on different narrow-band resources is different.

The broadcast information is MTC special broadcast information, wherein the indicated information at least comprises SFN (single frequency network) and narrow-band allocation information, and a narrow-band allocation information bit field indicates that MTC terminals of different service types use different narrow bands or predefined narrow bands 1, 2, 3, 4, 5 and 6 are respectively used for MTC terminals of different service types (intelligent meter reading, monitoring, medical treatment, intelligent transportation, emergency communication and intelligent home) to use different narrow bands, such as different system messages; or different types of cell public messages of the MTC terminals indicating the same service type use different narrow bands, such as system messages and RAR messages. The SS/MIB and narrowband allocation information need to be received first, and when there is a narrowband location change requirement, the UE obtains new narrowband allocation information by demodulating the narrowband in the center of subframe 0. The narrowband allocation information may indicate some available narrowbands, and the terminals of different service types convert the available narrowbands to receive the SIB and the dedicated message on the narrowband.

Fig. 7 is a diagram illustrating a second example of grouping downlink transmission information in different narrowband transmissions according to the preferred embodiment of the present invention, and as shown in fig. 7, when broadcast information includes narrowband allocation information, a same group includes channels carrying control information of cell common information and scheduling cell common information, or a same group includes channels carrying control information of user-specific information and scheduling user-specific information, and transmits the channels on different narrowband resources indicated by the narrowband allocation information.

The user-specific information and the corresponding control are located in other narrow bands, at this time, the control information of the scheduling cell public information and the corresponding public information (the sub-frame scheduling or the cross-sub-frame scheduling) are received in a central narrow band (preferred) or a predefined narrow band 2, and of course, if the resources are not enough (the central narrow band cannot simultaneously carry the control and the data), the control information of the scheduling cell public information can also be scheduled to be located in other narrow bands (the cross-sub-frame scheduling) or the narrow band position of the cell public information is predefined in a non-control transmission mode. The SS/MIB and/or narrowband allocation information is first received, and the narrowband allocation information may be indicated by information added to the MIB or by a subsequent SIB. When there is a narrowband location change requirement, the UE obtains new narrowband allocation information by demodulating system messages in the narrowband in the center of subframe 0 or in the narrowband in the center of other subframes. For the receiving of the cell public message in the mode, the receiving can be flexibly adjusted to other narrow bands through the narrow band allocation information, the condition that the central narrow band is unavailable or the resource is insufficient is avoided, and the number of the narrow bands is equal to 1 or more than 1.

Fig. 8 is a third schematic diagram of grouping downlink transmission information in different narrow-band transmissions according to a preferred embodiment of the present invention, as shown in fig. 8, a channel in the same group containing control information carrying scheduling cell public information and control information carrying scheduling user private information is transmitted according to an indication of the narrow-band allocation information when a central narrow-band is transmitted or the broadcast information contains an indication of the group of narrow-band allocation information. And the same group comprises channels for bearing cell public information and user special information, and the used narrow-band resources are indicated by control channel scheduling.

The control information for receiving the scheduling cell public information and/or the control information for scheduling the user-specific information is completely in a central narrow band (if the control information for scheduling the cell public information is not available, the cell public information is transmitted at the position of a predefined narrow band by adopting a non-control transmission operation) or other narrow bands indicated by broadcast information or predefined, the scheduled data is located in other narrow bands, at the moment, the cross-subframe scheduling is combined, the interval of time domain sub-frames of the cross-subframe scheduling can be 1 or 2 or other optional values, and at the moment, the narrow band allocation information does not need to be received firstly. For this method, more flexible narrow band usage is considered, for example, when the central bandwidth is not available or resources are not enough, narrow bands available for control information indicating flexible adjustment of scheduling cell public information and/or control information of scheduling user specific information or narrow bands available for predefined allocation control/service may be added to the MIB, and the number of narrow bands is equal to 1 or greater than 1.

Fig. 9 is a fourth schematic diagram of grouping downlink transmission information for transmission in different narrow bands according to a preferred embodiment of the present invention, as shown in fig. 9, a channel in the same group containing control information carrying cell common message, scheduling cell common information, and scheduling user dedicated information, or a channel in the same group containing control information carrying cell common message, user dedicated message, scheduling cell common information, and scheduling user dedicated information is sent according to an indication of the narrow band allocation information when the central narrow band is sent or the broadcast information contains the group of narrow band allocation information. And the same group contains channels for bearing cell public information and user-specific information, or the same group contains channels for bearing user-specific information only, or the same group contains channels for bearing cell public information only, and the used narrow-band resources are indicated by control channel scheduling.

And when the control information of the received scheduling cell public information and/or the control information of the scheduling user special information are all in the central narrow band (if the control information of the scheduling cell public information is not available, the cell public information is transmitted at a predefined narrow band position by adopting a non-control transmission operation), and resources are still remained, part of the cell public information and/or the user special information are simultaneously carried. And the scheduled data is located in other narrow bands, and at this time, the cross-subframe scheduling needs to be combined, the time domain subframe interval of the cross-subframe scheduling can be 1 or 2 or other optional values, and at this time, the narrow band allocation information does not need to be received firstly. For this method, more flexible narrow band usage is considered, for example, when the central bandwidth is not available or resources are not enough, narrow bands available for control information indicating flexible adjustment of scheduling cell public information and/or control information of scheduling user specific information or narrow bands available for predefined allocation control/service may be added to the MIB, and the number of narrow bands is equal to 1 or greater than 1.

Fig. 10 is a fifth schematic diagram of grouping downlink transmission information into different narrow bands for transmission according to the preferred embodiment of the present invention, and as shown in fig. 10, channels carrying all downlink information are transmitted in the same narrow band.

In the case where the system bandwidth is equal to the narrowband bandwidth, narrowband allocation information is not required. In which case the control information is multiplexed with the data information within the narrow band. The search space where the channel carrying the control information of the scheduling user-specific information is located is determined by a predefined or fixed or signaling notification mode before the RRC connection is established, and the signaling is carried in the SIB or the RAR. Before the RRC connection is established, because no high-layer signaling is sent, at this time, it is determined that parameters required by the USS cannot be obtained, and the parameters need to be determined by a predefined or fixed or signaling notification manner, where the signaling is carried in an SIB or RAR, and specifically includes one or more of a time-frequency domain resource location, an aggregation level, a candidate set, and a transmission manner of the USS. The signaling bit field only indicates the content except the predefined parameter, for example, the predefined transmission mode is centralized transmission, the aggregation level and the candidate set are fixedly selected to be L ═ 2 and there are 6 corresponding candidate sets, and at this time, the signaling only indicates the time-frequency domain resource location of the USS. The search space of the channel carrying control information scheduling user-specific information is the same for different users. The same search space includes that the user-specific search space and the public search space are completely overlapped or the user-specific search space before RRC connection establishment is the same. Specifically, when there is a CSS, that is, a cell common message uses corresponding control information to perform scheduling indication, at this time, the CSS and the USS may be considered as the same search space, where the aggregation level and the number of candidate sets selected by the CSS are less than the aggregation level and the number of candidate sets selected by the USS, and starting positions of candidate sets corresponding to the same aggregation levels of the CSS and the number of candidate sets are the same; when there is no CSS, i.e., the cell public message uses a control-less transmission method, the USS before RRC connection establishment is the same for each UE, which is equivalent to CSS configuration but there is no CSS. After the search space is determined, the base station implicitly allocates each UE with some parameters, such as UE ID, to obtain a search space specific to each UE. Specifically, the terminal determines which part of the USS is its own USS before RRC connection establishment according to some parameters, such as UE ID, for example, the starting positions of candidate sets corresponding to respective aggregation levels in the USS may be calculated by the UE ID. The search space of the channel for carrying the control information of the scheduling user-specific information is only the user-specific search space and is configured and determined in the same way before and after the RRC connection is established, and the same way is a predefined or fixed way. Specifically, for MTC UE, simplified processing is considered, USS related parameters do not use signaling notification, a predefined location and a transmission mode are adopted, initial USS configuration is the same as USS configuration after RRC connection establishment, and EPDCCH is received in the predefined location in a predefined mode. For example: each narrow band uses 1 or 2 PRBs as control channel region, and the rest PRBs are user data channel regions; or only arranging a control channel in the narrowband center, putting all the traffic channels in other narrowband transmission, and combining cross-subframe scheduling.

When the control information of the scheduling user specific information or the control information of the scheduling cell public information indicates the frequency domain resources occupied by the user specific information or the cell public information, the narrow band occupation information is indicated by using one bit field or the first part of the bit field, and the specific PRB occupation information in the narrow band is indicated by using the other bit field or the second part of the bit field. When cross-subframe scheduling is adopted and control information scheduling indicates corresponding data information, narrowband occupation information is indicated through a bit field or a first part of the bit field, if a center narrowband is used as a reference to shift to a high-frequency narrowband or a low-frequency narrowband, a first bit indicates to shift to the high frequency or shift to the low frequency, next x bits indicate the number of shifts, and x is less than or equal to 3; the other bit field or the second part of one bit field indicates specific PRB occupancy information in the narrowband. Further, when the control information of the scheduling user specific information or the control information of the scheduling cell public information indicates the time domain subframe resource occupied by the user specific information or the cell public information, a bit field is used to indicate the offset number of the subframe corresponding to the control information. Specifically, when cross-subframe scheduling is adopted and control information scheduling indicates corresponding data information, one bit field is used to indicate the offset number of a subframe where the control information is located, and the preferred offset values are 1, 2, 3 and 4.

The narrowband allocation may be configured separately for low cost MTC terminals and coverage enhanced MTC terminals. All channels in each group of the low-cost MTC terminals use different narrow bands with the coverage enhancement MTC terminals, or part of channels in each group of the low-cost MTC terminals use different narrow bands with the coverage enhancement MTC terminals. Specifically, since the coverage-enhanced MTC terminal usually needs to repeatedly transmit each channel when using a narrow band, separately configuring the coverage-enhanced MTC terminal and the low-cost MTC terminal in different narrow bands is more beneficial to the terminals that are required by each terminal to have less mutual interference, and ensures the resource usage of the normal communication of the low-cost MTC terminal. Specifically, the first mode is that all channels in each group of the low-cost MTC terminals use different narrow bands from the coverage enhancement MTC terminal, that is, the channels included in each group mode all ensure that the coverage enhancement MTC terminal uses a single narrow band, and preferably ensure the narrow band requirement of the low-cost MTC terminal; the second method is that part of channels in each group of the low-cost MTC terminals and the coverage-enhanced MTC terminals use different narrow bands, for example, the low-cost MTC terminals and the coverage-enhanced MTC terminals use the same narrow band to transmit cell public information, and the low-cost MTC terminals and the coverage-enhanced MTC terminals use different zahs to transmit user private information.

The pilot frequency used by the channel for bearing the cell public information, the user specific information, the control information of the scheduling cell public information and the control information of the scheduling user specific information is DMRS, and when the CRS is used jointly, one of the following modes is adopted: the DMRS pilot frequency does not add precoding, and simultaneously, information in a channel using the pilot frequency does not add precoding; specifically, at this time, the pilot estimation when the terminal jointly uses the CRS may be directly combined with the pilot estimation result of the DMRS, and no additional precoding information needs to be added. The DMRS pilot uses predefined precoding, and information in a channel using the pilot also uses the predefined precoding; specifically, when the terminal uses CRS jointly, it first needs to add predefined open-loop MIMO precoding to the received CRS pilot value, and at this time, the precoding is known, and then is combined with the channel estimation result of DMRS. The DMRS pilot uses precoding, while the user-specific information in the data channel using the pilot also uses precoding, while the precoding information is indicated by scheduling control information of the user-specific information. Specifically, at this time, when the terminal uses the CRS jointly, a predefined closed-loop MIMO precoding needs to be added to the received CRS pilot value, and at this time, the precoding is known through the control information and then combined with the channel estimation result of the DMRS.

Furthermore, a mapping relationship exists between the CRS port and the DMRS port, wherein the mapping relationship is calculated at least according to the port mapping matrix.

Specifically, the total set of DMRS pilot ports used is D ═ {7, 8, 9, 10, 11, 12, 13, 14}, the total set of CRS pilot ports used is C ═ 0, 1, 2, 3}, and the port mapping matrix W is a predefined matrix. For example: C.W is equal to D,then DMRS tip is usedWhen the port 7 is used, the CRS port 0 is correspondingly used in a combined mode; orThen when DMRS port 7 or 8 or 7, 8 is used, CRS ports 0, 1 are used jointly.

The following further describes downlink information transmission with specific embodiments.

Example 1

When the base station sends downlink information, the base station sends synchronization information and broadcast information at the central narrow band position of the system bandwidth of the sub-frame 0 of the wireless frame N, wherein the central narrow band is 6PRB, the broadcast information comprises system frame number information and narrow band distribution information, and the base station sends the synchronization information at the central narrow band position of the system bandwidth of the sub-frame 5 of the wireless frame N. The narrow-band allocation information indicates that 7 narrow bands are available in the system bandwidth, and the narrow bands are respectively located at the center and numbered as narrow bands 1-7 from low frequency to high frequency, wherein the narrow bands are positively offset by 1-3 narrow bands and negatively offset by 1-3 narrow bands.

The base station sends control information of scheduling cell public information and cell public information in each available narrow band in a radio frame N subframe 1, wherein a cell public search space in which a control channel bearing the cell public information is located in 2 PRBs in a narrow band center, the control channel resources are occupied by an aggregation level L of 2, and a centralized transmission mode is adopted. The cell public information is system information, and the system information in each narrow band is different.

The base station sends control information of the special information of the scheduling user and the special information of the user in a narrow band 2 in a radio frame N + M subframe x, RRC connection is not established yet, the special information of the user is a message four in a random access process, a special search space of the user where a control channel bearing the control information of the special information of the scheduling user is located is not determined yet, a public search space of a cell is still used, and the aggregation level L1 is used to occupy the resource of the control channel. And after the RRC connection is established, using the user-specific search space.

By the optional embodiment, different narrow bands in the system bandwidth send different system information, and the narrow band allocation information added in the broadcast information enables terminals of different service types to receive respective system information in different narrow bands, which is beneficial to reducing interference of the terminals of different service types in the same narrow band, and enables each narrow band to operate independently.

Example 2

When the base station sends downlink information, the base station sends synchronization information and broadcast information at the position of a central narrow band of a system bandwidth of a subframe 0 of a radio frame N, wherein the central narrow band is 72 subcarriers, and the base station sends the synchronization information at the position of the central narrow band of the system bandwidth of the subframe 5 of the radio frame N. 5 narrow bands are available in the predefined system bandwidth, which are respectively located at the center narrow band with a positive offset of 1-2 narrow bands and a negative offset of 1-2 narrow bands, and are numbered as narrow bands 1-5 from low frequency to high frequency.

The base station sends control information and cell public information of scheduling cell public information in a narrow band 3 and a narrow band 2 in a center of a subframe 1 of a radio frame N, wherein a cell public search space in which a control channel bearing the cell public information is located in 2 PRBs in the center of the narrow band, the control channel resource is occupied by an aggregation level L2, and a centralized transmission mode is adopted. The cell public information is system information, RAR message, Paging message, and the cell public information in the two narrow bands may be different. At the moment, the coverage enhancement MTC terminal and the low-cost MTC terminal both use the same narrow band to transmit cell public information.

The base station sends control information and user-specific information of scheduling user-specific information in a narrow band 1 in a radio frame N + M subframe x, sends control information and user-specific information of scheduling coverage enhancement user-specific information in a narrow band 5, at the moment, RRC connection is not established, wherein the user-specific information is a message four in a random access process, a user-specific search space where a control channel bearing the control information of the scheduling user-specific information is located is not determined at the moment, a cell public search space is still used, and at the moment, the aggregation level L is 1 to occupy control channel resources. And after the RRC connection is established, using the user-specific search space.

Through the embodiment, different narrow bands send different cell public messages in the system bandwidth, the cell public messages with larger bearing contents are favorably carried, meanwhile, different terminals use different narrow bands to receive the cell public messages, the problem that the different cell public messages cannot be borne by the same narrow band is avoided, different narrow band transmission is used for proprietary messages for a coverage enhancement terminal and a low-cost terminal, and the interference of the coverage enhancement terminal on the low-cost terminal is reduced.

Example 3

When the base station sends downlink information, the base station sends synchronization information and broadcast information at the central narrow band position of the system bandwidth of the sub-frame 0 of the wireless frame N, wherein the central narrow band is 72 sub-carriers, the broadcast information comprises system frame number information and narrow band distribution information, and the base station sends the synchronization information at the central narrow band position of the system bandwidth of the sub-frame 5 of the wireless frame N. The narrow-band allocation information indicates that 5 narrow bands are available in the system bandwidth, and the narrow bands are respectively located at the center and numbered as narrow bands 1-5 from low frequency to high frequency, wherein the narrow bands are positively offset by 1-2 narrow bands and negatively offset by 1-2 narrow bands.

The base station narrowly transmits control information of scheduling cell public information and cell public information in a radio frame N subframe 1 center, wherein a cell public search space where a control channel bearing the cell public information is located in 2 PRBs on both sides of a narrow band edge, control channel resources are occupied by aggregation level L4, and a distributed transmission mode is adopted. The cell public information is system information.

The base station sends control information and user-specific information of scheduling user-specific information in a narrow band 5 in a radio frame N + M subframe x, and the narrow band position is determined by narrow band allocation information in broadcast information or by adding corresponding high-level signaling indication in received system information. At this time, the RRC connection is not yet established, where the user-specific information is signaling information issued by a higher layer before the RRC connection is established, a user-specific search space in which a control channel carrying control information for scheduling the user-specific information is located is not yet determined, a predefined user-specific search space is used, the user-specific search space occupies 2 PRBs in the center of the narrowband, the control channel resources are occupied by an aggregation level L ═ 1, and distributed transmission is adopted. And after the RRC connection is established, using the user special search space configured by the high-level signaling.

And when the control channel carrying the control information of the scheduling user specific information is transmitted, open-loop MIMO precoding predefined based on the DMRS pilot frequency is used. At this time, CRS pilots are transmitted simultaneously in the narrow band. In this case, DMR is usedS pilot frequency port 7, according to port mapping relation C.W ═ D and mapping matrix CRS ports 0, 1 are used jointly. The terminal jointly uses the CRS pilot frequency when demodulating the control information, adds predefined open-loop MIMO precoding to the CRS pilot frequency value, and then combines the CRS pilot frequency value with the channel estimation result of the DMRS.

By the optional embodiment, the cell public information is sent in the same narrow band in the system bandwidth, and different terminals receive respective user private information in different narrow bands through narrow band allocation information added in the broadcast information or high-level signaling indication of the system, so that the problem that the narrow band cannot bear when the public information and the private information are received simultaneously can be avoided, and the use efficiency of the system bandwidth is improved. And two pilot frequencies are used simultaneously, so that the transmission performance is improved.

Example 4

When the base station sends downlink information, the base station sends synchronization information and broadcast information at the position of a central narrow band of a system bandwidth of a subframe 0 of a radio frame N, wherein the central narrow band is 72 subcarriers, and the base station sends the synchronization information at the position of the central narrow band of the system bandwidth of the subframe 5 of the radio frame N. The broadcasting channel carrying the broadcasting information uses a transmission mode based on DMRS pilot frequency without precoding, meanwhile, CRS pilot frequency is still sent in the system, and the terminal directly combines the channel estimation results of the two pilot frequencies when receiving.

The base station transmits control information of the public information of the scheduling cell in a narrow band at the center of a subframe 1 of a radio frame N, wherein a predefined cell public search space in which a control channel bearing the public information of the cell is located in all 6 PRBs in the narrow band, the control channel resource is occupied by an aggregation level L which is 8, and a distributed transmission mode is adopted. The control information of the scheduling cell public information indicates that the corresponding cell public information is located in all PRB resources in 3 narrow bands offset on the frequency of the next subframe, and the cell public information is system information.

The base station transmits control information of the special information of the scheduling user in a narrow band at the center of a radio frame N + M subframe x, at the moment, RRC connection is not established completely, the special information of the user is signaling information issued by a high layer before the RRC connection is established, a special search space of the user where a control channel bearing the control information of the special information of the scheduling user is located is not determined at the moment, a predefined search space which is the same as the public search space is used, at the moment, the special search space of the user occupies all 6 PRBs in the narrow band, the control channel resource is occupied by an aggregation level L which is 2, and distributed transmission is adopted. The predefined user-specific search space is still used after the RRC connection is established. The control information for scheduling the user-specific information indicates that the corresponding user-specific information is located in 4 PRB resources offset by 2 in the next subframe narrowband.

And when the control channel carrying the control information of the scheduling user specific information is transmitted, open-loop MIMO precoding predefined based on the DMRS pilot frequency is used. At this time, CRS pilots are transmitted simultaneously in the narrow band. The terminal jointly uses the CRS pilot frequency when demodulating the control information, adds predefined open-loop MIMO precoding to the CRS pilot frequency value, and then combines the CRS pilot frequency value with the channel estimation result of the DMRS.

And when the downlink physical service channel carrying the user specific information is transmitted, closed-loop MIMO precoding based on DMRS pilot frequency is used. At this time, CRS pilots are transmitted simultaneously in the narrow band. The terminal jointly uses the CRS pilot frequency when demodulating the control information, firstly adds predefined closed-loop MIMO precoding to the CRS pilot frequency value, the precoding serial number is notified by the control information of the scheduling user-specific information, and then the precoding serial number is combined with the channel estimation result of the DMRS.

By the optional embodiment, the control information of the public information of the scheduling cell and the control information of the special information of the scheduling user are transmitted in the narrow band of the system bandwidth center, and the cross-subframe scheduling is combined, so that the data information occupies the narrow band resource flexibly and does not need to use the narrow band distribution information. By jointly using the two pilot frequencies, different channels can use different transmission modes, and the performance of each channel is improved.

Example 5

When the base station sends downlink information, the base station sends synchronization information and broadcast information at the position of a central narrow band of a system bandwidth of a radio frame N subframe 0, wherein the central narrow band is 72 subcarriers, the base station sends the synchronization information at the position of the central narrow band of the system bandwidth of a radio frame N subframe 5, and the broadcast information comprises system frame number information and narrow band allocation information. The narrow-band allocation information indicates that 6 narrow bands are available in the system bandwidth, and the narrow bands are respectively located at the center and numbered as narrow bands 1-6 from low frequency to high frequency, wherein the narrow bands are positively offset by 1-2 narrow bands and negatively offset by 1-3 narrow bands. The broadcasting channel carrying the broadcasting information uses a transmission mode based on DMRS pilot frequency without precoding, meanwhile, CRS pilot frequency is still sent in the system, and the terminal directly combines the channel estimation results of the two pilot frequencies when receiving.

The base station sends control information of scheduling cell public information in a radio frame N subframe 1 narrow band 3, wherein a cell public search space in which a control channel bearing the cell public information is located in 2 PRBs on both sides of the narrow band edge, the control channel resource is occupied by an aggregation level L4, and a distributed transmission mode is adopted. The control information of the scheduling cell public information indicates that the corresponding cell public information is located in 1 PRB resource next to the public search space in the same narrow band of the subframe, and the cell public information is system information.

The base station sends control information for scheduling user-specific information in a radio frame N + M subframe x narrow band 3, at the moment, RRC connection is not established completely, the user-specific information is signaling information issued by a high layer before RRC connection establishment, a user-specific search space where a control channel for bearing the control information for scheduling the user-specific information is located is not determined at the moment, a predefined user-specific search space is used, at the moment, the user-specific search space occupies 2 PRBs in the center of the narrow band, the control channel resources are occupied by an aggregation level L ═ 1, and distributed transmission is adopted. And after the RRC connection is established, using the user special search space configured by the high-level signaling. The control information for scheduling the user-specific information indicates that the corresponding user-specific information is located in 4 PRB resources in the next subframe narrowband 2.

By the optional embodiment, the control information of the public information of the scheduling cell, the control information of the public information of the cell and the control information of the special information of the scheduling user are sent in the narrow band with the same system bandwidth, the narrow band where the control information is located is determined by the narrow band distribution information, the narrow band resources occupied by the data information are very flexible by the sub-frame/cross-sub-frame scheduling, and the system efficiency is improved. By jointly using the two pilot frequencies, different channels can use different transmission modes, and the performance of each channel is improved.

Example 6

When the base station sends the downlink information, the synchronous information and the broadcast information are sent at the central narrow band position of the system bandwidth of the sub-frame 0 of the wireless frame N, and the system bandwidth is the same as the narrow band bandwidth. And sending the synchronous information at the narrowband position of the system bandwidth center of the subframe 5 of the wireless frame N.

The base station transmits control information of the public information of the scheduling cell in a narrow band at the center of a subframe 1 of a radio frame N, wherein a predefined cell public search space in which a control channel bearing the public information of the cell is located in 2 PRBs (resource blocks) on the inner edge of the narrow band, the control channel resource is occupied by an aggregation level L2, and a distributed transmission mode is adopted. And the control information of the scheduling cell public information indicates that the corresponding cell public information is positioned in 2 PRB resources in the center of the subframe, and the cell public information is system information.

The base station transmits control information of the special information of the scheduling user in a narrow band at the center of a radio frame N + M subframe x, at the moment, RRC connection is not established yet, the special information of the user is signaling information issued by a high layer before the RRC connection is established, a special search space of the user where a control channel bearing the control information of the special information of the scheduling user is located is not determined at the moment, a predefined search space which is the same as the public search space is used, at the moment, the special search space of the user occupies 2 PRBs on the inner edge of the narrow band, the control channel resource is occupied by an aggregation level L1, and distributed transmission is adopted. The predefined user-specific search space is still used after the RRC connection is established. The control information for scheduling the user specific information indicates that the corresponding user specific information is located in 2 PRB resources in the center of the next subframe.

By the embodiment, when the system bandwidth is equal to the narrowband bandwidth, all messages are transmitted through the central narrowband, and the data information occupies the narrowband resources very flexibly by combining the subframe scheduling and the cross-subframe scheduling. By jointly using the two pilots, the channel performance is improved.

It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for sending downlink information is characterized by comprising the following steps:

grouping channels bearing different downlink information;

allocating the grouped channels to narrow-band resources for transmission;

allocating the grouped channels to the narrowband resource for transmission comprises at least one of:

allocating channels in the same group to the same narrow-band resource for transmission, and allocating channels in different groups to different time-domain resources in the same narrow-band resource for transmission;

the channel carrying the synchronization information and/or the broadcast information is sent on the narrow band of the system bandwidth center;

transmitting at least one of the following on the narrowband resource determined by the signaling configuration or the predefined mode: and carrying cell public information and downlink user specific information.

2. The method of claim 1, wherein the time domain resource comprises at least one of the following units: subframe, field, radio frame.

3. The method of claim 1, wherein the narrowband resource is a resource in N narrowbands partitioned in a system wideband, where N is greater than or equal to 1.

4. The method of claim 3, wherein each of the narrowband resources is: 5 physical resource blocks PRB, 6PRB, 15PRB, or 25 PRB.

5. The method of claim 1, wherein the downlink information comprises at least one of: synchronization information, broadcast information, cell public information, downlink user specific information, control information for scheduling cell public information, control information for scheduling downlink user specific information, control information for scheduling uplink user specific information.

6. The method according to any one of claims 1 to 5,

at least one of the following is also sent on the narrow-band resource determined by the signaling configuration or the predefined mode: control information of scheduling cell public information, a channel of control information of scheduling downlink user private information, and a channel of control information of scheduling uplink user private information.

7. The method of claim 6,

the signaling configuration includes at least one of: broadcast signaling, system message signaling, physical layer signaling;

the predefined mode comprises determining available narrow bands for transmitting one or more of cell public information, downlink user specific information, control information for scheduling cell public information, control information for scheduling downlink user specific information and control information for scheduling uplink user specific information.

8. The method of claim 6,

and the same group comprises channels for bearing cell public messages, downlink user proprietary information, control information for scheduling cell public information, control information for scheduling downlink user proprietary information and/or control information for scheduling uplink user proprietary information, and the channels are sent on different predefined narrow-band resources indicated by narrow-band allocation information contained in the broadcast information or according to different predefined narrow-band resources, wherein the cell public messages sent on different narrow-band resources are different.

9. The method of claim 8, wherein the difference in the cell common messages comprises: the method comprises the following steps of (1) sharing messages with the same type and different contents in cells or sharing messages with different types in cells, wherein the types comprise: SIB, RAR, or Paging.

10. The method of claim 8, wherein separate channels carrying synchronization information and/or broadcast information can be transmitted on different narrowband resources.

11. The method of claim 6,

the same group comprises a channel for bearing control information of cell public information and scheduling cell public information, or the same group comprises a channel for bearing control information of downlink user special information and scheduling user special information, and the same group is sent on different predefined narrow-band resources or narrow-band allocation information indication contained in broadcast information.

12. The method of claim 6,

the same group comprises a channel for bearing control information of public information of a scheduling cell and control information of private information of a scheduling user, and the control information is transmitted in a central narrow band; or, in the case that the broadcast information includes narrowband allocation information indicating the packet, transmitting on a narrowband resource indicated by the narrowband allocation information or transmitting on a predefined narrowband;

channels carrying cell common information and/or downlink user specific information are included in the same group and are transmitted on the narrowband resources indicated by the control channel scheduling.

13. The method of claim 6,

the same group comprises channels for bearing control information of the community public information, the scheduling community public information and the scheduling user special information, or the same group comprises channels for bearing control information of the community public information, the downlink user special information, the scheduling community public information and the scheduling user special information, and the channels are sent on a central narrow band; or, in the case that the broadcast information includes the packet narrowband allocation information, transmitting on a narrowband resource indicated by the narrowband allocation information or transmitting on a predefined narrowband;

and the channel which carries the cell public information and the user special information is included in the same group, or the channel which only carries the cell public information is included in the same group, and the channel is transmitted on the narrow-band resource indicated by the control channel scheduling.

14. The method of claim 6, wherein the channels carrying all downlink information are transmitted on the same narrowband resource.

15. The method according to any one of claims 7 to 14, wherein the number of narrowband resources used for narrowband transmission of information in the packet is 1 or more when the system bandwidth is not centered.

16. The method according to any one of claims 7 to 14,

and determining the search space of the channel for carrying the control information of the downlink user special information by a predefined or fixed or signaling notification mode before the RRC connection is established.

17. The method according to claim 16, characterized in that the signaling is carried in a system information block, SIB, or a random access response, RAR, wherein the signaling bit field only indicates content other than predefined parameters.

18. The method of claim 16,

the search space of the channel carrying the control information of the scheduling downlink user specific information is the same for different users, wherein the same search space comprises: the user-specific search space and the public search space are completely overlapped, or the user-specific search space before the RRC connection is established is the same.

19. The method of claim 16,

and after the search space is determined, implicitly allocating the user-specific search space of the user equipment to each user equipment UE through predetermined parameters.

20. The method of claim 19, wherein the determining of the user-specific search space comprises: the method is determined by selecting the narrow-band resources first and then selecting the PRBs in the narrow-band resources, or directly selecting the PRBs in the full bandwidth.

21. The method according to any one of claims 7 to 14,

the search space of the channel for carrying the control information of the scheduling downlink user-specific information is only the user-specific search space and is configured and determined in the same manner before and after the RRC connection is established, wherein the same manner is a predefined or fixed manner.

22. The method according to any one of claims 7 to 14,

and when the control information of the user-specific information or the control information of the cell public information is scheduled to indicate the frequency domain resources occupied by the user-specific information or the cell public information, the narrow-band occupation information is indicated by using a first part of one bit field or one bit field, and the PRB occupation information in the narrow band is indicated by using a second part of the other bit field or one bit field.

23. The method according to any of claims 7 to 14, wherein the control information for scheduling the uplink user specific information comprises at least one complete sounding reference signal, SRS, when indicating the frequency domain resource of the narrowband where the uplink user specific information is located.

24. The method according to any of claims 7 to 14, wherein the control information determines the RA domain according to the number of PRBs corresponding to the maximum system bandwidth, or wherein the control information determines the RA domain according to the number of PRBs corresponding to the current system bandwidth, or wherein the control information determines the RA domain according to the number of PRBs corresponding to the maximum bandwidth received by the user equipment.

25. The method according to any one of claims 7 to 14,

and when the control information of the user specific information or the control information of the cell public information is scheduled to indicate the time domain subframe resources occupied by the downlink user specific information or the cell public information, using a bit field to indicate the offset number relative to the subframe where the control information is located.

26. The method according to any one of claims 7 to 14,

27. The method according to any one of claims 7 to 14,

the pilot used by the channel for carrying the broadcast information, the cell public information, the user-specific information, the control information for scheduling the cell public information and the control information for scheduling the user-specific information is a demodulation reference signal (DMRS), and one of the following modes is adopted when the cell-specific pilot is jointly used by the CRS:

the DMRS pilot frequency does not add precoding, and the information in the channel using the DMRS pilot frequency does not add precoding;

the DMRS pilot uses a predefined precoding, and information in a channel using the DMRS pilot uses the predefined precoding;

the DMRS pilot uses precoding, and the user specific information in the data channel using the DMRS pilot uses the precoding, wherein the precoding information is indicated by scheduling control information of the user specific information.

28. The method of claim 27, wherein a mapping relationship exists between the CRS ports and DMRS ports, and wherein the mapping relationship is calculated at least according to a port mapping matrix.

29. The method of claim 27, wherein the pilots used are DMRS, wherein a time division multiplexing is used when CRS is jointly used, wherein only DMRS pilots are used in some subframes, and only CRS pilots are used in other subframes, or wherein DMRS and CRS pilots are used simultaneously in other subframes.

30. A downlink information receiving method, comprising:

when receiving downlink information, grouping and receiving channels carrying different downlink information on narrowband resources;

grouping reception of the channels carrying different downlink information on the narrowband resource comprises at least one of:

receiving channels in the same group on the same narrow-band resource, and receiving channels in different groups on different time domain resources in the same narrow-band resource;

the grouping reception of the channels carrying different downlink information on the narrowband resource comprises at least one of the following:

receiving a downlink channel carrying synchronization information and/or broadcast information at least on a narrow band of a system bandwidth center at a certain period or predefined subframes;

the narrowband used for carrying at least one of the cell public information and the downlink user special information is determined by a signaling configuration or a predefined mode.

31. The method of claim 30, wherein the time domain resources comprise at least one of the following units: subframe, field, radio frame.

32. The method of claim 30, wherein the narrowband resource is a resource in N narrowbands partitioned in a system bandwidth, where N is greater than or equal to 1.

33. The method of claim 30, wherein each of the narrowband resources is 5 Physical Resource Blocks (PRBs), 6 PRBs, 15 PRBs, or 25 PRBs.

34. The method of claim 30, wherein the downlink information comprises at least one of: synchronization information, broadcast information, cell public information, downlink user specific information, control information for scheduling cell public information, control information for scheduling downlink user specific information, control information for scheduling uplink user specific information.

35. The method according to any of claims 30 to 34, wherein packet receiving channels carrying different downlink information on narrowband resources comprises at least one of:

the narrow band used by at least one of the channels for carrying the control information of the public information of the scheduling cell, the control information of the special information of the scheduling downlink user and the control information of the special information of the scheduling uplink user is determined by signaling configuration or a predefined mode.

36. The method of claim 35,

the predefined manner includes determining available narrowbands for reception of one or more of cell public information, downlink user specific information, control information for scheduling cell public information, control information for scheduling downlink user specific information, and control information for scheduling uplink user specific information.

37. The method of claim 35,

and the same group comprises channels for bearing cell public messages, downlink user proprietary information, control information of scheduling cell public information, control information of scheduling downlink user proprietary information and/or control information of scheduling uplink user proprietary information, and the channels are received on different predefined narrowband resources according to narrowband allocation information contained in the broadcast information, wherein the cell public messages received on the different narrowband resources are different.

38. The method of claim 37, wherein the difference in the cell common messages comprises: the method comprises the following steps of (1) sharing messages with the same type and different contents in cells or sharing messages with different types in cells, wherein the types comprise: SIB, RAR, or Paging.

39. The method of claim 35, wherein separate channels carrying synchronization information and/or broadcast information can be received on different narrowband resources.

40. The method of claim 35,

and the same group comprises channels for bearing control information of cell public information and scheduling cell public information, or the same group comprises channels for bearing control information of downlink user special information and scheduling user special information, and the channels are received on different narrow-band resources indicated by or predefined by narrow-band allocation information contained in the broadcast information.

41. The method of claim 35,

the same group comprises a channel for bearing control information of public information of a scheduling cell and control information of private information of a scheduling user, and the channel is received in a central narrow band, or when broadcast information contains indication of the group of narrow band distribution information, the channel is received according to the indication of the narrow band distribution information or is received in a predefined narrow band;

and the channels containing the common information of the bearing cells and/or the special information of the downlink users in the same group are received on the narrow-band resources indicated by the control channel scheduling.

42. The method of claim 35,

the same group comprises channels for bearing the control information of the community public information, the control information of the scheduling community public information and the control information of the scheduling user special information, or the same group comprises channels for bearing the control information of the community public information, the downlink user special information, the control information of the scheduling community public information and the control information of the scheduling user special information, and the channels are received in a central narrow band; or, when the broadcast information contains the group of narrowband allocation information, receiving according to the indication of the narrowband allocation information or receiving in a predefined narrowband;

and receiving the channel which contains the public information of the bearing cell and the special information of the downlink user in the same group, or only containing the public information of the bearing cell in the same group on the narrow-band resource indicated by the control channel scheduling.

43. The method of claim 35, wherein the channels carrying all downlink information are received within the same narrowband.

44. The method according to any one of claims 36 to 43, wherein the number of narrowband resources used for narrowband transmission of information in the packet is 1 or more when the system bandwidth is non-centric.

45. The method of any one of claims 36 to 43,

the search space of the channel carrying the control information of the scheduling downlink user proprietary information is determined by a predefined or fixed or signaling notification mode before the RRC connection is established.

46. The method of claim 45, wherein the signaling is carried in a SIB or RAR, and wherein a signaling bit field only indicates content other than predefined parameters.

47. The method of claim 45,

48. The method of claim 45,

and after the search space is determined, implicitly determining the user-specific search space of each user equipment through a preset parameter.

49. The method of claim 48, wherein the determining of the user-specific search space comprises: the method is determined by selecting the narrow-band resources first and then selecting the PRBs in the narrow-band resources, or directly selecting the PRBs in the full bandwidth.

50. The method of any one of claims 36 to 43,

51. The method of any one of claims 36 to 43,

when the control information of the downlink user specific information or the control information of the scheduling cell public information indicates the frequency domain resources occupied by the downlink user specific information or the cell public information, the first part of one bit field or one bit field is used for indicating the narrow band occupation information, and the second part of the other bit field or one bit field is used for indicating the specific PRB occupation information in the narrow band.

52. The method according to any of claims 36 to 43, wherein the control information for scheduling the uplink user specific information comprises at least one complete SRS when indicating the frequency domain resources of the narrowband where the uplink user specific information is located.

53. The method according to any of claims 36 to 43, wherein the control information of the scheduling user specific information determines the RA field according to the number of PRBs corresponding to the maximum system bandwidth, or the control information determines the RA field according to the number of PRBs corresponding to the current system bandwidth, or the control information determines the RA field according to the number of PRBs corresponding to the maximum bandwidth received by the user equipment.

54. The method of any one of claims 36 to 43,

and when the control information of the scheduling user special information or the control information of the scheduling cell public information indicates the time domain subframe resources occupied by the user special information or the cell public information, a bit field is used for indicating the offset number of the subframe corresponding to the control information.

55. The method of any one of claims 36 to 43,

56. The method of any one of claims 36 to 43,

the pilot frequency used by the channel for bearing the broadcast information, the cell public information, the user specific information, the control information of the scheduling cell public information and the control information of the scheduling user specific information is DMRS, and one of the following modes is adopted when CRS is used jointly:

the DMRS pilot frequency does not add precoding, and simultaneously, information in a channel using the pilot frequency does not add precoding;

the DMRS pilot uses predefined precoding, and information in a channel using the pilot also uses the predefined precoding;

the DMRS pilot uses precoding, while the user-specific information in the data channel using the pilot also uses precoding, while the precoding information is indicated by scheduling control information of the user-specific information.

57. The method of claim 56, wherein a mapping relationship exists between CRS ports and DMRS ports, and wherein the mapping relationship is computed based at least on a port mapping matrix.

58. The method of claim 56, wherein the pilots used are DMRS, wherein joint use of CRS is performed in a time division multiplexing manner, wherein only DMRS pilots are used in some subframes, and wherein only CRS pilots are used in other subframes, or wherein both DMRS and CRS pilots are used in other subframes.

59. A downlink information transmitting apparatus, comprising:

the grouping module is used for grouping channels bearing different downlink information;

the transmission module is used for distributing the grouped channels to the narrow-band resources for transmission;

the transmission module comprises at least one of:

the first transmission unit is used for distributing the channels in the same group to the same narrow-band resource for transmission;

a second transmission unit, configured to allocate channels in different packets to different time domain resources in the same narrowband resource for transmission;

60. The apparatus of claim 59, wherein the transmission module comprises:

a third transmission unit, configured to send a channel carrying synchronization information and/or broadcast information on a narrowband in a system bandwidth center;

determining a transmission unit for transmitting at least one of the following on the narrowband resource determined by the signaling configuration or the predefined manner: the channel of the control information of the load cell public information, the downlink user special information, the control information of the scheduling cell public information, the control information of the scheduling downlink user special information and the control information of the scheduling uplink user special information.

61. A downlink information receiving apparatus, comprising:

a receiving module, configured to receive, in a packet manner, channels carrying different downlink information on a narrowband resource when receiving the downlink information;

wherein, the grouping reception of the channels carrying different downlink information on the narrowband resource comprises at least one of the following: receiving channels in the same group on the same narrow-band resource, and receiving channels in different groups on different time domain resources in the same narrow-band resource;