CN106301723B

CN106301723B - Downlink data sending method, receiving method, sending device and receiving device

Info

Publication number: CN106301723B
Application number: CN201510263343.1A
Authority: CN
Inventors: 石靖; 夏树强; 戴谦; 戴博; 张雯
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2015-05-21
Filing date: 2015-05-21
Publication date: 2020-03-03
Anticipated expiration: 2035-05-21
Also published as: WO2016184275A1; CN106301723A

Abstract

The invention provides a sending method, a receiving method, a sending device and a receiving device of downlink data, wherein the sending method of the downlink data comprises the following steps: when the base station needs to send the downlink service, the base station directly sends the fast message carrying the downlink data information. The invention solves the problems of complex downlink scheduling mode flow and large time delay in the related technology, and further achieves the effects of reducing the complexity of the downlink scheduling mode flow and reducing the time delay.

Description

Downlink data sending method, receiving method, sending device and receiving device

Technical Field

The present invention relates to the field of communications, and in particular, to a transmission method, a reception method, a transmission device, and a reception device for downlink data.

Background

With the increasing improvement of the commercial fourth Generation mobile communication technology (the 4th Generation mobile communication technology, abbreviated as 4G) Long-Term Evolution (Long-Term Evolution, abbreviated as LTE)/Long-Term Evolution advanced (Long-Term Evolution/LTE-a) system, the requirement of the technical index of the next Generation mobile communication technology, namely the fifth Generation mobile communication technology (the 5th Generation mobile communication technology, abbreviated as 5G), is also increasing. It is widely accepted in the industry that next generation mobile communication systems should have the characteristics of ultra-high speed, ultra-high capacity, ultra-high reliability, and ultra-low delay transmission characteristics. For the index of ultra-low delay in 5G systems, it is currently accepted that the delay of the air interface is in the order of about 1 ms.

Generally, LTE downlink data transmission first needs to establish a Radio Resource Control (RRC) connection from an IDLE (IDLE) state. In the connected state, a downlink channel measurement is performed first before a Base Station (BTS, or ENB, E-UTRAN NodeB) sends downlink data to a terminal (UE) through control scheduling. An ENB sends a cell-specific reference Channel (CRS) to a UE, and the UE estimates a Channel-Quality Indicator (CQI) and reports the Channel-Quality Indicator to the ENB. The CQI not only tells the quality of the ENB channel but also contains the recommended coded modulation scheme. And then, the ENB allocates downlink resources, wherein the ENB adaptively allocates the downlink resources according to the quality of the downlink channel. In downlink, the ENB dynamically allocates resources and a code modulation scheme to the UE per subframe. Then, the ENB transmits data on a Physical Downlink Shared Channel (PDSCH), fills the data on the PDSCH according to a resource allocation result, and transmits corresponding scheduling control information on a Physical Downlink Control Channel (PDCCH) so that the UE can receive and demodulate the PDSCH. After receiving the PDSCH, the UE needs to feed back whether the feedback is correct, and feeds back an acknowledgement or a negative acknowledgement (ACK/NACK) through a Physical Uplink Control Channel (PUCCH). If there is a data transmission error later, i.e. the feedback is NACK, the UE needs to retransmit the data. And the feedback is implemented after uplink synchronization. It can be seen that the downlink data transmission process in the related art is complicated in steps, and the requirement of ultra-low delay transmission characteristics in a future 5G system is difficult to guarantee.

Aiming at the problems of complex downlink scheduling mode flow and large time delay in the related technology, no effective solution is provided at present.

Disclosure of Invention

The invention provides a sending method, a receiving method, a sending device and a receiving device of downlink data, and at least solves the problems of complex flow and large time delay of a downlink scheduling mode in the related technology.

According to an aspect of the present invention, a method for transmitting downlink data is provided, including: when the base station needs to send the downlink service, the base station directly sends the fast message carrying the downlink data information.

Optionally, the downlink data information includes at least one of: unicast service, multicast service, broadcast service; the quick message includes at least one of: a specific quick message, a paging message, a broadcast message scrambled by a private radio network temporary identity RNTI; when the downlink data information includes the unicast service, the fast message also carries at least feedback indication information used by the terminal to feed back the downlink data information in the fast message.

Optionally, when the downlink data information includes the unicast service, the sending, by the base station, the fast message carrying the downlink data information includes: sending a fast message carrying downlink data information of one or more users; when the downlink data includes a multicast service and/or a broadcast service, the sending, by the base station, a fast message carrying downlink data information includes: and sending the fast message carrying one or more multicast services and/or broadcast services.

Optionally, when the downlink data information includes the unicast service, and the fast message includes the specific fast message scrambled by the private radio network temporary identifier RNTI or the broadcast message, the fast message further carries terminal identifier information corresponding to the downlink data information.

Optionally, the feedback indication information includes: and aiming at the unicast service carried in the quick message, indicating information for indicating the sequence of feeding back the Acknowledgement (ACK) information or the Negative Acknowledgement (NACK) information, and/or configuring information for configuring the sequence of feeding back the ACK information or the NACK information.

Optionally, after sending the fast message carrying the downlink data information, the method further includes: the base station receives the ACK information or NACK information fed back by the terminal; and the base station receives an uplink fast transmission message transmitted by the terminal, wherein the uplink fast transmission message is transmitted by the terminal after a sequence carrying the ACK information or the NACK information in a time domain.

Optionally, the ACK information or NACK information corresponds to a preamble configured by the base station, and the indication information and/or configuration information includes random access channel configuration information.

Optionally, when the base station determines that the unicast service carried in the fast message received and demodulated by the terminal is correct, the ACK information is fed back, or the NACK information is fed back when the unicast service carried in the fast message received and demodulated by the terminal is incorrect, the feedback indication information includes configuration information of a preamble corresponding to the indicated ACK information and configuration information of a preamble corresponding to the indicated NACK information; when the base station determines that the unicast service carried in the fast message is received and demodulated correctly by the terminal, the ACK information is fed back, and when the unicast service carried in the fast message is received and demodulated incorrectly by the terminal, the feedback indication information does not comprise the indicated configuration information of the lead code corresponding to the ACK information; when the base station determines that the unicast service carried in the fast message received and demodulated by the terminal is correct, the base station does not feed back information, and when the unicast service carried in the fast message received and demodulated by the terminal is wrong, the NACK information is fed back, and the feedback indication information includes the indicated configuration information of the preamble corresponding to the NACK information.

Optionally, the base station respectively configures a preamble for feeding back the ACK information and the NACK information for the same terminal, and root sequences of the preamble configured for feeding back the ACK information for the same terminal and the preamble configured for feeding back the NACK information for the same terminal are the same and/or cyclic shift step lengths are the same.

Optionally, the preamble corresponding to the ACK information or the NACK information is a preamble determined by the base station according to a root sequence of a limited set and/or a cyclic shift category of the limited set.

Optionally, the time domain length of the preamble configured by the base station is less than or equal to one subframe length; when the time domain length of the preamble configured by the base station is smaller than one subframe length, the feedback indication information further includes indication information for indicating a used Orthogonal Frequency Division Multiplexing (OFDM) symbol position in a subframe, where the used OFDM symbol position is an OFDM symbol position where the preamble configured by the base station is located.

Optionally, the preamble configured by the base station may or may not be used for uplink random access by the terminal, where the preamble that can be used for uplink random access by the terminal is different from the preamble that cannot be used for uplink random access by the terminal.

Optionally, after the base station directly sends the fast message carrying the downlink data information, the method further includes: the base station receives a lead code fed back by the terminal; when a lead code fed back by a terminal has the capability of feeding back ACK (acknowledgement character) information or NACK (negative acknowledgement) information and the lead code fed back by the terminal simultaneously has the capability of performing uplink random access, the base station sends a Random Access Response (RAR) message to the terminal; and when the lead code fed back by the terminal only has the capability of feeding back ACK (acknowledgement character) information or NACK (negative acknowledgement character) information, the base station does not send a Random Access Response (RAR) message.

Optionally, when the downlink data information includes the unicast service, after the base station directly sends a fast message carrying the downlink data information, the method further includes: the base station stops sending the fast message when at least one of the following conditions is met: the base station receives Acknowledgement (ACK) information fed back by the terminal; the waiting time after the base station sends the fast message exceeds a predetermined threshold.

According to another aspect of the present invention, there is provided a method for receiving downlink data, including: and the terminal receives the quick message which is directly sent by the base station and carries the downlink data information.

Optionally, the feedback indication information includes: the indication information is used for indicating the terminal to feed back the sequence of the acknowledgement ACK information or the negative acknowledgement NACK information to the unicast service carried in the quick message, and/or the configuration information is used for configuring the sequence of the acknowledgement ACK information or the negative acknowledgement NACK information fed back by the terminal to the unicast service carried in the quick message.

Optionally, after receiving the fast message carrying the downlink data information sent by the base station, the terminal further includes: the terminal feeds back the ACK information or NACK information to the base station; and the terminal transmits the uplink quick transmission message next to the sequence carrying the ACK information or the NACK information in the time domain.

Optionally, when the terminal receives and demodulates that the unicast service carried in the fast message is correct, the ACK information is fed back, or when the terminal receives and demodulates that the unicast service carried in the fast message is incorrect, the NACK information is fed back, where the feedback indication information includes configuration information of a preamble corresponding to the indicated ACK information and configuration information of a preamble corresponding to the indicated NACK information; when the terminal receives and demodulates that the unicast service carried in the quick message is correct, the ACK information is fed back, and when the terminal receives and demodulates that the unicast service carried in the quick message is incorrect, the ACK information is not fed back, and the feedback indication information comprises the configuration information of the lead code corresponding to the indicated ACK information; when the terminal receives and demodulates that the unicast service carried in the quick message is correct, the terminal does not feed back information, and receives and demodulates that the unicast service carried in the quick message is wrong, and feeds back the NACK information, the feedback indication information includes the configuration information of the lead code corresponding to the NACK information.

Optionally, the preamble corresponding to the ACK information and the preamble corresponding to the NACK information are preambles configured by the base station respectively, and root sequences of the preambles corresponding to the ACK information and the preambles corresponding to the NACK information are the same and/or cyclic shift step lengths are the same.

Optionally, a time domain length of a preamble corresponding to the ACK information or the NACK information is less than or equal to a subframe length; when the time domain length of the preamble corresponding to the ACK information or the NACK information is smaller than one subframe length, the feedback indication information further includes indication information for indicating an orthogonal frequency division multiplexing OFDM symbol position used in a subframe, where the used OFDM symbol position is an OFDM symbol position where the preamble configured by the base station is located.

Optionally, a preamble corresponding to the ACK information or the NACK information may or may not be used for uplink random access by the terminal, where the preamble that can be used for uplink random access by the terminal is different from the preamble that cannot be used for uplink random access by the terminal.

Optionally, after receiving the fast message carrying the downlink data information sent by the base station, the terminal further includes: the terminal sends a lead code to the base station; and when the lead code sent by the terminal has the capability of feeding back ACK (acknowledgement character) information or NACK (negative acknowledgement character) information and the lead code fed back by the terminal simultaneously has the capability of performing uplink random access, the terminal receives a Random Access Response (RAR) message sent by the base station.

According to another aspect of the present invention, there is provided a downlink data transmission apparatus, the apparatus being located at a base station side, including: and the sending module is used for directly sending the quick message carrying the downlink data information when the downlink service needs to be sent.

Optionally, the apparatus further comprises: a first receiving module, configured to receive the ACK information or NACK information fed back by the terminal; and a second receiving module, configured to receive an uplink fast transmission message transmitted by the terminal, where the uplink fast transmission message is transmitted by the terminal after a sequence carrying the ACK information or the NACK information in a time domain.

Optionally, the apparatus further comprises: a third receiving module, configured to receive a preamble fed back by the terminal; a second sending module, configured to send a random access response RAR message to a terminal when a preamble fed back by the terminal has a capability of feeding back ACK information or NACK information and the preamble fed back by the terminal has a capability of performing uplink random access at the same time; and when the preamble fed back by the terminal only has the capability of feeding back ACK (acknowledgement) information or NACK (negative acknowledgement) information, not sending a Random Access Response (RAR) message.

Optionally, when the downlink data information includes the unicast service, the method further includes: a stopping module, configured to stop sending the fast message by the base station when at least one of the following conditions is met: the base station receives Acknowledgement (ACK) information fed back by the terminal; the waiting time after the base station sends the fast message exceeds a predetermined threshold.

According to another aspect of the present invention, there is provided an apparatus for receiving downlink data, the apparatus being located at a terminal side, including: and the fourth receiving module is used for receiving the fast message which is directly sent by the base station and carries the downlink data information.

Optionally, the apparatus further comprises: a feedback module, configured to feed back the ACK information or NACK information to the base station; and the transmission module is used for transmitting the uplink fast transmission message next to the sequence carrying the ACK information or the NACK information in the time domain.

Optionally, the apparatus further comprises: a third sending module, configured to send a preamble to the base station; a fifth receiving module, configured to receive a random access response RAR message sent by the base station when the sent preamble has a capability of feeding back ACK information or NACK information and the preamble fed back by the terminal has a capability of performing uplink random access at the same time.

According to the invention, when the base station needs to send the downlink service, the base station is adopted to directly send the quick message carrying the downlink data information, and does not need to send the downlink data after a series of interaction with the terminal, so that the time delay of data transmission is reduced, the problems of complex flow and large time delay of a downlink scheduling mode in the related technology are solved, and the effects of reducing the complexity of the flow of the downlink scheduling mode and reducing the time delay are achieved.

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 flowchart of a method of transmitting downlink data according to an embodiment of the present invention;

fig. 2 is a structural diagram illustrating a specific fast message corresponding to scrambling using a proprietary RNTI according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a broadcast message when a user unicast service is transmitted downstream in a fast manner according to an embodiment of the present invention;

fig. 4 is a diagram illustrating a structure of a paging message in an LTE/LTE-a system in the related art;

fig. 5 is a schematic structural diagram of a paging message when a user unicast service is transmitted rapidly in downlink according to an embodiment of the present invention;

FIG. 6 is a diagram illustrating a structure of a paging message in downlink fast broadcast information transmission according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a paging message when a user unicast service and broadcast information are transmitted simultaneously in a downlink fast manner according to an embodiment of the present invention;

fig. 8 is a flowchart of a method of receiving downlink data according to an embodiment of the present invention;

fig. 9 is a block diagram of a structure of a downlink data transmission apparatus according to an embodiment of the present invention;

fig. 10 is a block diagram of a preferred structure of a downlink data transmission apparatus according to an embodiment of the present invention;

fig. 11 is a block diagram of a preferred configuration of a downlink data transmission apparatus according to an embodiment of the present invention;

fig. 12 is a block diagram of a preferred configuration of a downlink data transmission apparatus according to an embodiment of the present invention;

fig. 13 is a block diagram of a structure of a downlink data receiving apparatus according to an embodiment of the present invention;

fig. 14 is a block diagram of a preferred structure of a device for receiving downlink data according to an embodiment of the present invention;

fig. 15 is a block diagram of a preferred configuration of a downlink data receiving apparatus according to an 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.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. Also, "ACK information" described in the present specification may be simply referred to as "ACK" and "NACK information" may be simply referred to as "NACK".

In this embodiment, a method for transmitting downlink data is provided, and fig. 1 is a flowchart of a method for transmitting downlink data according to an embodiment of the present invention, as shown in fig. 1, the flowchart includes the following steps:

step S102, when needing to send downlink service, the base station directly sends a fast message carrying downlink data information.

Through the steps, when the base station needs to send the downlink service, the base station does not need to schedule interaction, directly sends the fast message carrying the downlink data information, does not need to send the downlink data after a series of interaction with the terminal, and reduces the time delay of data transmission. The problems of complex downlink scheduling mode flow and large time delay in the related technology are solved, and the effects of reducing the complexity of the downlink scheduling mode flow and reducing the time delay are achieved.

In an optional embodiment, the downlink data information may include at least one of: unicast service, multicast service, broadcast service; the quick message may include at least one of: a specific fast message, a paging message, a broadcast message scrambled by a Radio Network Temporary Identifier (RNTI); when the downlink data information includes a unicast service, the fast message also carries at least feedback indication information used by the terminal to feed back the downlink data information in the fast message. The specific fast message scrambled by the special RNTI may be a specific fast message of a certain user which is scrambled by using a Cell Radio Network Temporary Identifier (C-RNTI), or may be a specific fast message which is scrambled by using the special RNTI and which is capable of carrying downlink data information of one or more users.

Fig. 2 is a structural diagram illustrating a specific fast message corresponding to scrambling using a proprietary RNTI according to an embodiment of the present invention. As shown in fig. 2, a specific fast message corresponding to a preferred proprietary RNTI scrambling is composed of a bearer User information list (i.e., a downlink data information list) and optional other information, where the User information list is further composed of message blocks of each User, and may include one or more users, where each User message block is composed of a User Equipment (UE) Identifier (Identifier, abbreviated as ID), User data, and feedback indication information.

In an optional embodiment, when the downlink data information includes a unicast service, the sending, by the base station, the fast message carrying the downlink data information includes: sending a fast message carrying downlink data information of one or more users; when the downlink data includes a multicast service and/or a broadcast service, the sending, by the base station, the fast message carrying downlink data information includes: and sending the fast message carrying one or more multicast services and/or broadcast services.

In an optional embodiment, when the downlink data information includes a unicast service, and the fast message includes a specific fast message or a broadcast message scrambled by a private radio network temporary identity RNTI, the fast message further carries terminal identity information corresponding to the downlink data information. When the fast message carrying the downlink data Information is a broadcast message, that is, user list Information is added to a System Information Block (SIB) message in the related art. As shown in fig. 3, fig. 3 is a schematic structural diagram of a broadcast message when a user unicast service is transmitted in a fast downlink transmission mode according to an embodiment of the present invention, where a user information list further includes message blocks of each user, and may include one or more users, where each user message block includes a UE ID, a user message, and feedback indication information. When the Paging Message is used for downlink fast transmission, a Paging Message structure in the related art is shown in fig. 4, and fig. 4 is a schematic structural diagram of a Paging Message in an LTE/LTE-a system in the related art. The Paging message supports one or more UEs, the message which can be specifically subdivided into the UE level can be distinguished is a Paging Record, user equipment identification UE-Identity and core network Domain cn-Domain are provided in the Paging Record in the related technology, and different UEs can identify their own Paging information by checking the UE-Identity. Meanwhile, the Paging message can notify system information change, Earthquake and Tsunami Warning Signal (ETWS for short) Warning and other information. Fig. 5 is a schematic structural diagram of a Paging message during downlink fast transmission of user unicast service according to an embodiment of the present invention, where a base station sends a unicast Data carrying user, as shown in fig. 5, the Paging message may carry downlink Data information of one or more users and simultaneously carries Feedback Indication information corresponding to the downlink Data information, and correspondingly adds downlink Data information user equipment Data ue-Data and Feedback Indication information Feedback Indication in a Paging Record. Fig. 6 is a schematic structural diagram of a Paging message during downlink fast broadcast information transmission according to an embodiment of the present invention, where when a base station sends a broadcast message or a multicast message (hereinafter referred to as a broadcast/multicast message), as shown in fig. 6, the Paging message may carry one or more different broadcast/multicast messages, and correspondingly, a broadcast/multicast message BroadcastInfo is added to a Paging message. Fig. 7 is a schematic structural diagram of a Paging message when a downlink fast transmits a user unicast service and broadcast information at the same time according to an embodiment of the present invention, where, if a base station simultaneously transmits a unicast Data and a broadcast/multicast message carrying a user, as shown in fig. 7, the Paging message may carry one or more different broadcast/multicast messages and downlink Data information of one or more users, and simultaneously carries Feedback Indication information corresponding to the downlink Data information, correspondingly adds broadcast/multicast message broadcast information in a Paging message, and adds downlink Data information ue-Data and Feedback Indication information in a Paging Record.

In an optional embodiment, the feedback indication information includes: for the unicast service carried in the fast message, the indication information is used to indicate the sequence of feeding back the acknowledgement ACK information or the negative acknowledgement NACK information, and/or the configuration information is used to configure the sequence of feeding back the acknowledgement ACK information or the negative acknowledgement NACK information, that is, the feedback indication information may be used to indicate or configure the terminal to feed back the relevant parameter information representing the sequence of the ACK information or the NACK information. Since the terminal does not perform uplink synchronization at this time, it is necessary to indicate ACK or NACK using a sequence that lasts for a certain length of time.

In an optional embodiment, after sending the fast message carrying the downlink data information, the method further includes: the base station receives ACK information or NACK information fed back by the terminal; and the base station receives an uplink fast transmission message transmitted by the terminal, wherein the uplink fast transmission message is transmitted by the terminal after a sequence carrying the ACK information or the NACK information in a time domain. That is to say, when the terminal receives the downlink fast transmission message and then has a requirement for the uplink fast transmission message, or the downlink fast transmission message may be considered as a condition for triggering the uplink fast transmission, the uplink fast transmission message is transmitted next to a sequence carrying ACK or NACK, that is, the former part of the sequence may not only feed back the ACK or NACK for the downlink fast transmission, but also serve as data information for the latter part of the uplink fast transmission after uplink synchronization protection.

In an optional embodiment, the ACK information or NACK information corresponds to a preamble configured by the base station, and the indication information and/or configuration information includes random access channel configuration information. The sequence representing the ACK information or the NACK information is preferably a preamble sequence preamble in a physical random access channel PRACH, and the feedback indication information is PRACH configuration information for determining the preamble used by the terminal for feeding back the ACK or NACK.

In an optional embodiment, when the base station determines that the unicast service carried in the fast message received and demodulated by the terminal is correct, or when the unicast service carried in the fast message received and demodulated by the terminal is incorrect, the ACK information is fed back, where the feedback indication information includes configuration information of a preamble corresponding to the indicated ACK information and configuration information of a preamble corresponding to the indicated NACK information; when the base station determines that the unicast service carried in the fast message received and demodulated by the terminal is correct, the base station feeds back ACK information, and when the unicast service carried in the fast message received and demodulated by the terminal is incorrect, the base station does not feed back information, and the feedback indication information comprises configuration information of a lead code corresponding to the indicated ACK information; when the base station determines that the unicast service carried in the fast message received and demodulated by the terminal is correct, the base station does not feed back information, and when the unicast service carried in the fast message received and demodulated by the terminal is wrong, the base station feeds back NACK information, the feedback indication information includes configuration information of a preamble corresponding to the indicated NACK information. Wherein, (1) when determining that the terminal receives the unicast service carried in the demodulation rapid message is correct, feeding back ACK information, and when receiving the unicast service carried in the demodulation rapid message is incorrect, feeding back NACK information, wherein the feedback indication information includes configuration information indicating preambles corresponding to ACK and NACK, that is, the feedback indication information explicitly configures preambles used by ACK and NACK, the information indicates 1 corresponding ACK in 64 preambles using 6 bits, indicates 1 corresponding NACK in 64 preambles using 6 bits, and indicates a Physical Random Access Channel (PRACH) MASK Index using 4 bits, to indicate a subframe Index sent by the physical random Access Channel; or the method for indicating ACK and NACK to use preamble also comprises using 6 bits to indicate 1 corresponding ACK of 64 preambles, and the next corresponding NACK; or the method for indicating ACK and NACK to use preamble further comprises using 11 bits to indicate that 2 different preambles in 64 preambles respectively correspond to ACK and NACK; (2) when the terminal is determined to receive the unicast service carried in the demodulation fast message correctly, the ACK is fed back, and when the unicast service carried in the demodulation fast message is received incorrectly, the ACK is not fed back, the feedback indication information only comprises configuration information of preamble corresponding to the indication ACK, namely the feedback indication information explicitly configures the preamble used by the ACK, the information indicates 1 corresponding ACK in 64 preambles by using 6 bits, and indicates PRACH MASK Index by using 4 bits, so as to indicate the subframe Index sent by the information; (3) when the terminal is determined to receive the unicast service carried in the demodulation quick message correctly without feedback, and the unicast service carried in the demodulation quick message is received incorrectly with feedback NACK, the feedback indication information only contains the configuration information indicating the preamble corresponding to NACK, that is, the feedback indication information explicitly configures the preamble used by NACK, and the information indicates 1 corresponding NACK in 64 preambles by using 6 bits, and indicates PRACHMASK Index by using 4 bits of information, indicating the subframe index sent by the information.

In an optional embodiment, the base station configures a preamble for feeding back ACK information and NACK information for the same terminal, and a root sequence of the preamble configured for feeding back ACK information for the same terminal is the same as a root sequence of the preamble configured for feeding back NACK information for the same terminal and/or a cyclic shift step length is the same. Wherein, generating 64 preambles in a cell may require multiple root sequences, and even if the largest cyclic shift step is selected, one root sequence may generate two preambles. Therefore, in order to make the preamble representing the feedback information ACK or NACK as small as possible to affect other terminals in the cell to use for the random access request, the root sequence corresponding to the preamble representing the feedback information ACK or NACK is made different from the root sequence corresponding to the preamble for the random access, and the root sequence corresponding to the preamble representing the feedback information ACK or NACK is only a small part of the root sequence corresponding to the preamble for the random access.

In an optional embodiment, the preamble corresponding to the ACK information or the NACK information is a preamble determined by the base station according to a finite set of root sequences and/or a finite set of cyclic shift categories. As above, the root sequence corresponding to the preamble used for indicating the feedback information ACK or NACK is only a small part with respect to the root sequence corresponding to the preamble used for random access, i.e. it is a limited set. Similarly, when determining the cell preamble containing the additional representative feedback information ACK or NACK, the cyclic shift categories that can be used are values of a part of them, i.e. a finite set, relative to the cyclic shift categories used only for generating the random access preamble.

In an optional embodiment, the time domain length of the preamble configured by the base station is less than or equal to one subframe length; when the time domain length of the preamble configured by the base station is smaller than one subframe length, the feedback indication information further includes indication information for indicating an Orthogonal Frequency Division Multiplexing (OFDM) symbol position used in a subframe, where the OFDM symbol position used is an OFDM symbol position where the preamble configured by the base station is located. The fast downlink data transmission method in this embodiment mainly considers a low-delay communication scenario (an alternative scenario is an asynchronous transmission scenario or a small data transmission scenario, etc.), and at this time, the coverage of the cell is not large, and a longer preamble is not needed. Therefore, the preamble time domain length for indicating the feedback information ACK or NACK is preferably less than or equal to 1 subframe length, i.e., preferably format 1. For the preamble with a length less than 1 subframe, preferably format 4, when using this format, the feedback indication information further needs to include an OFDM symbol position used in the subframe, for example, an OFDM group that may be used for the preamble with a length less than 1 subframe in the subframe is numbered, if numbering is performed in a non-overlapping manner, and it is assumed that it occupies 2 OFDM, 14 OFDM symbols in 1 subframe are divided into 7 consecutive groups, and at this time, 3 bits are used to notify which OFDM group the preamble is located in for transmission.

In an optional embodiment, the preamble configured by the base station may be used or may not be used for uplink random access by the terminal, where the preamble that can be used for uplink random access by the terminal is different from the preamble that cannot be used for uplink random access by the terminal. That is, the feedback indication information may be used not only for the terminal to feed back the preamble corresponding to the ACK information or the NACK information, but also for indicating the preamble used by the terminal for the uplink random access. That is, the terminal may further continue to complete the uplink synchronization process while performing the fast downlink data transmission. In other words, the preamble representing that the terminal feeds back ACK or NACK has two functions, one is used for feeding back ACK or NACK to perform correct or incorrect feedback on the fast downlink transmission so that the base station can obtain the acknowledgement information, and the other is used for uplink synchronization, and the preamble is used for simultaneously sending a preamble to the base station for the first step of the terminal in the random access process. The preamble used for terminal feedback ACK or NACK and uplink random access at the same time is different from the preamble used for terminal feedback ACK or NACK only, that is, both the two preambles are part of 64 preambles in a cell, and the two preambles are different.

In an optional embodiment, after the base station directly sends the fast message carrying the downlink data information, the method further includes: the base station receives a lead code fed back by the terminal; when the lead code fed back by the terminal has the capability of feeding back the ACK information or the NACK information and the lead code fed back by the terminal simultaneously has the capability of performing uplink Random Access, the base station sends a Random Access Response (RAR) message to the terminal; when the preamble fed back by the terminal only has the capability of feeding back the ACK information or the NACK information, the base station does not send a Random Access Response (RAR) message. After receiving the user data in the correct paging message, the terminal feeds back the user data by using a preamble representing ACK (acknowledgement character), and meanwhile, the preamble also has a random access function. After receiving the user data in the wrong paging message, the terminal feeds back by using a preamble representing NACK, and the preamble also has a random access function. After receiving the preamble only having the function of feeding back the ACK information or the NACK information, the base station does not send the corresponding RAR message.

In an optional embodiment, when the downlink data information includes a unicast service, after the base station directly sends a fast message carrying the downlink data information, the method further includes: the base station stops sending the fast message when at least one of the following conditions is met: the base station receives the ACK information fed back by the terminal; the latency after the base station sends the fast message exceeds a predetermined threshold. This example is illustrated below: after sending the paging message containing the user data, the base station waits for the feedback information of the user, and if the preamble corresponding to the ACK fed back by the terminal is received, the paging message is sent periodically, so that the base station stops sending the paging message containing the unicast service of the terminal. If the base station only indicates the terminal to receive the data error feedback NACK, after the NACK is not received and the waiting time is greater than a threshold value X (the same as the preset threshold value), the receiving is considered to be correct, and the paging message containing the unicast service of the terminal is stopped. Wherein the value of X may be 1 or more paging message periods.

Fig. 8 is a flowchart of a method for receiving downlink data according to an embodiment of the present invention, and as shown in fig. 8, the flowchart includes the following steps:

step S802, the terminal receives a fast message carrying downlink data information directly sent by the base station.

Through the steps, the terminal can receive the rapid message which is directly sent by the base station and carries the downlink data information under the condition of not needing scheduling interaction with the base station, so that when the base station needs to send the downlink service to the terminal, the downlink data does not need to be sent after a series of interaction with the terminal, and the time delay of data transmission is reduced. The problems of complex downlink scheduling mode flow and large time delay in the related technology are solved, and the effects of reducing the complexity of the downlink scheduling mode flow and reducing the time delay are achieved.

In an optional embodiment, the downlink data information includes at least one of: unicast service, multicast service, broadcast service; the quick message includes at least one of: a specific quick message, a paging message, a broadcast message scrambled by a private radio network temporary identity RNTI; when the downlink data information includes a unicast service, the fast message also carries at least feedback indication information used for the terminal to feed back the downlink data information in the fast message. The specific fast message scrambled by the special RNTI may be a specific fast message of a certain user which is scrambled by using a Cell Radio network temporary Identifier (C-RNTI), or may be a specific fast message which is scrambled by using the special RNTI and which is capable of carrying downlink data information of one or more users. As shown in fig. 2, a specific fast message corresponding to a preferred proprietary RNTI scrambling is composed of a bearer User information list and optional other information, where the User information list is further composed of message blocks of each User, and may contain one or more users, where each User message block is composed of a User Equipment (UE) Identifier (ID for short), a User message, and feedback indication information.

In an optional embodiment, the feedback indication information includes: the feedback indication information may be used to indicate or configure the terminal to feed back relevant parameter information representing a sequence of ACK information or NACK information, where the sequence is used to indicate the terminal to feed back a sequence of ACK information or NACK information for the unicast service carried in the quick message, and/or is used to configure the terminal to feed back a sequence of ACK information or NACK information for the unicast service carried in the quick message. Since the terminal does not perform uplink synchronization at this time, it is necessary to indicate ACK or NACK using a sequence that lasts for a certain length of time.

In an optional embodiment, after the terminal receives the fast message carrying the downlink data information sent by the base station, the method further includes: the terminal feeds back ACK information or NACK information to the base station; the terminal transmits the uplink fast transmission message next to the sequence carrying the ACK information or the NACK information in the time domain. That is to say, when the terminal receives the downlink fast transmission message and then has a requirement for the uplink fast transmission message, or the downlink fast transmission message may be considered as a condition for triggering the uplink fast transmission, the uplink fast transmission message is transmitted next to a sequence carrying ACK information or NACK information, that is, the former part of the sequence may not only feed back the ACK information or NACK information of the downlink fast transmission, but also serve as data information of the latter part of uplink fast transmission for uplink synchronization protection.

In an optional embodiment, the ACK information or NACK information corresponds to a preamble configured by the base station, and the indication information and/or configuration information includes random access channel configuration information. The sequence representing the ACK information or the NACK information is preferably a preamble sequence preamble in a physical random access channel PRACH, and the feedback indication information is PRACH configuration information for determining the preamble used by the terminal for feeding back the ACK information or the NACK information.

In an optional embodiment, when the terminal receives and demodulates that the unicast service carried in the fast message is correct, the ACK information is fed back, or receives and demodulates that the unicast service carried in the fast message is incorrect, the NACK information is fed back, where the feedback indication information includes configuration information of a preamble corresponding to the indicated ACK information and configuration information of a preamble corresponding to the indicated NACK information; when the terminal receives and demodulates the unicast service carried in the quick message correctly, the ACK information is fed back, and when the terminal receives and demodulates the unicast service carried in the quick message incorrectly, the ACK information is not fed back, and the feedback indication information comprises the configuration information of the lead code corresponding to the indicated ACK information; when the terminal receives and demodulates the unicast service carried in the fast message correctly without feeding back the information and receives and demodulates the unicast service carried in the fast message incorrectly with feeding back the NACK information, the feedback indication information comprises the configuration information of the lead code corresponding to the indicated NACK information. The terminal receives a unicast service correct feedback ACK carried in a demodulation quick message, receives a unicast service error feedback NACK carried in the demodulation quick message, wherein the feedback indication information comprises configuration information of preamble corresponding to the indication ACK and the NACK, namely the feedback indication information explicitly configures the preamble used by the ACK and the NACK, the information uses 6 bits to indicate 1 corresponding ACK in 64 lead codes, uses 6 bits to indicate 1 corresponding NACK in the 64 lead codes, and uses 4 bits to indicate a PRACH MASK Index MASK Index to indicate a subframe Index sent by the PRACH MASK Index; or the method for indicating ACK and NACK to use preamble also comprises using 6 bits to indicate 1 corresponding ACK of 64 preambles, and the next corresponding NACK; or the method for indicating ACK and NACK to use preamble further comprises using 11 bits to indicate that 2 different preambles in 64 preambles respectively correspond to ACK and NACK; (2) the terminal receives a unicast service correct feedback ACK carried in the demodulation quick message, receives a unicast service error carried in the demodulation quick message and does not feed back, the feedback indication information only comprises configuration information indicating a preamble corresponding to the ACK, namely the feedback indication information explicitly configures the preamble used by the ACK, the information indicates 1 corresponding ACK in 64 preambles by using 6 bits, and indicates PRACHMASK Index by using 4 bits of information to indicate a subframe index sent by the information; (3) the terminal receives the unicast service carried in the demodulation quick message, the unicast service carried in the demodulation quick message is correct and not fed back, the unicast service carried in the demodulation quick message is incorrect and fed back NACK, the feedback indication information only comprises configuration information indicating a preamble corresponding to the NACK, namely the feedback indication information explicitly configures the preamble used by the NACK, the information indicates 1 corresponding NACK in 64 preambles by using 6 bits, and indicates PRACH MASK Index by using 4 bits, so as to indicate a subframe Index sent by the information.

In an optional embodiment, the preamble corresponding to the ACK information and the preamble corresponding to the NACK information are preambles configured by the base station respectively, and root sequences of the preambles corresponding to the ACK information and the preambles corresponding to the NACK information are the same and/or cyclic shift steps are the same. Wherein, generating 64 preambles in a cell may require multiple root sequences, and even if the largest cyclic shift step is selected, one root sequence may generate two preambles. Therefore, in order to make the preamble representing the feedback information ACK or NACK as small as possible to affect other terminals in the cell to use for the random access request, the root sequence corresponding to the preamble representing the feedback information ACK or NACK is made different from the root sequence corresponding to the preamble for the random access, and the root sequence corresponding to the preamble representing the feedback information ACK or NACK is only a small part of the root sequence corresponding to the preamble for the random access.

In an optional embodiment, a time domain length of a preamble corresponding to the ACK information or the NACK information is less than or equal to a subframe length; when the time domain length of the preamble corresponding to the ACK information or the NACK information is smaller than one subframe length, the feedback indication information further includes indication information for indicating an Orthogonal Frequency Division Multiplexing (OFDM) symbol position used in the subframe, where the used OFDM symbol position is an OFDM symbol position where the preamble configured by the base station is located. The fast downlink data transmission method in this embodiment mainly considers a low-delay communication scenario (an alternative scenario is an asynchronous transmission scenario or a small data transmission scenario, etc.), and at this time, the coverage of the cell is not large, and a longer preamble is not needed. Therefore, the preamble time domain length for indicating the feedback information ACK or NACK is preferably less than or equal to 1 subframe length, i.e., preferably format 1. For the preamble with a length less than 1 subframe, preferably format 4, when using this format, the feedback indication information further needs to include an OFDM symbol position used in the subframe, for example, an OFDM group that may be used for the preamble with a length less than 1 subframe in the subframe is numbered, if numbering is performed in a non-overlapping manner, and it is assumed that it occupies 2 OFDM, 14 OFDM symbols in 1 subframe are divided into 7 consecutive groups, and at this time, 3 bits are used to notify which OFDM group the preamble is located in for transmission.

In an optional embodiment, the preamble corresponding to the ACK information or the NACK information may or may not be used for uplink random access by the terminal, where the preamble that can be used for uplink random access by the terminal is different from the preamble that cannot be used for uplink random access by the terminal. That is, the feedback indication information is not only used for the terminal to feed back the preamble corresponding to the ACK or NACK information, but also used for indicating the preamble used by the terminal for uplink random access. That is, the terminal may further continue to complete the uplink synchronization process while performing the fast downlink data transmission. In other words, the preamble representing that the terminal feeds back ACK or NACK has two functions, one is used for feeding back ACK or NACK to perform correct or incorrect feedback on the fast downlink transmission so that the base station can obtain the acknowledgement information, and the other is used for uplink synchronization, and the preamble is used for simultaneously sending a preamble to the base station for the first step of the terminal in the random access process. The preamble used for terminal feedback ACK or NACK and uplink random access at the same time is different from the preamble used for terminal feedback ACK or NACK only, that is, both the two preambles are part of 64 preambles in a cell, and the two preambles are different.

In an optional embodiment, after receiving the fast message carrying the downlink data information sent by the base station, the terminal further includes: the terminal sends a lead code to a base station; and when the lead code sent by the terminal has the capability of feeding back the ACK information or the NACK information and the lead code fed back by the terminal simultaneously has the capability of performing uplink random access, the terminal receives a random access response RAR message sent by the base station. This example is illustrated below: and after receiving the preamble, the base station stops sending the paging message containing the user data of the terminal and simultaneously sends an RAR message to continue the random access process. After receiving the user data in the wrong paging message, the terminal feeds back by using a preamble representing NACK, and the preamble also has a random access function. After receiving the preamble only with the function of feeding back the ACK or NACK, the base station does not send the corresponding RAR message.

Through the above description of the embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but the former is a better implementation mode in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (such as a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.

In this embodiment, a device for sending downlink data is further provided, where the device is used to implement the foregoing embodiments and preferred embodiments, and details of the foregoing description are omitted. 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. 9 is a block diagram of a downlink data transmission apparatus according to an embodiment of the present invention, which may be located on the base station side, and as shown in fig. 9, the apparatus includes a transmission module 92, which is described below.

The sending module 92 is configured to directly send a fast message carrying downlink data information when a downlink service needs to be sent.

In an optional embodiment, the downlink data information may include at least one of: unicast service, multicast service, broadcast service; the quick message may include at least one of: a specific quick message, a paging message, a broadcast message scrambled by a private radio network temporary identity RNTI; when the downlink data information includes a unicast service, the fast message also carries at least feedback indication information used by the terminal to feed back the downlink data information in the fast message. The specific fast message scrambled by the special RNTI may be a specific fast message of a certain user which is scrambled by using a Cell radio network Temporary Identifier (C-RNTI), or may be a specific fast message which is scrambled by using the special RNTI and which is capable of carrying downlink data information of one or more users. As shown in fig. 2, a specific fast message corresponding to a preferred proprietary RNTI scrambling is composed of a bearer User information list and optional other information, where the User information list is further composed of message blocks of each User, and may contain one or more users, where each User message block is composed of a User Equipment (UE) Identifier (ID for short), a User message, and feedback indication information.

In an optional embodiment, when the downlink data information includes a unicast service, and the fast message includes a specific fast message or a broadcast message scrambled by a private radio network temporary identity RNTI, the fast message further carries terminal identity information corresponding to the downlink data information. When the fast message carrying the downlink data Information is a broadcast message, that is, user list Information is added to a System Information Block (SIB) message in the related art. As shown in fig. 3, the user information list further comprises message blocks of each user, and may comprise one or more users, wherein each user message block comprises UE ID, user message, and feedback indication information. When the Paging Message is used for downlink fast transmission, a Paging Message structure in the related art is shown in fig. 4, the Paging Message supports one or more UEs, and is specifically subdivided into a Message capable of distinguishing UE levels as a Paging Record Paging, a user equipment identifier UE-Identity and a cn Domain cn-Domain are included in the Paging Record in the related art, and different UEs can identify their own Paging information by checking the UE-Identity. Meanwhile, the Paging message can inform system information change, ETWS alarm and other information. When the base station sends the unicast Data carrying the users, as shown in fig. 5, the paging message may carry downlink Data information of one or more users, and simultaneously carry Feedback Indication information corresponding to the downlink Data information, and correspondingly add downlink Data information user equipment Data ue-Data and Feedback Indication information Feedback Indication in the pagengrecord. When the base station sends a broadcast message or a multicast message (hereinafter referred to as a broadcast/multicast message), as shown in fig. 6, the Paging message may carry one or more different broadcast/multicast messages, and correspondingly adds a broadcast/multicast message BroadcastInfo to the Paging message. If the base station simultaneously sends the unicast Data carrying the user and the broadcast/multicast message, as shown in fig. 7, the Paging message may carry one or more different broadcast/multicast messages and downlink Data information of one or more users, and simultaneously carries Feedback Indication information corresponding to the downlink Data information, correspondingly adds broadcast/multicast message BroadcastInfo to the Paging message, and adds downlink Data information ue-Data and Feedback Indication information Feedback Indication to the Paging Record.

Fig. 10 is a block diagram of a preferred structure of a device for sending downlink data according to an embodiment of the present invention, and as shown in fig. 10, the device includes a first receiving module 102 and a second receiving module 104 in addition to all the modules shown in fig. 9, and the device is explained below.

A first receiving module 102, connected to the sending module 92, for receiving ACK information or NACK information fed back by the terminal; a second receiving module 104, connected to the first receiving module 102, configured to receive an uplink fast transmission message transmitted by the terminal, where the uplink fast transmission message is transmitted by the terminal immediately after the sequence carrying the ACK information or the NACK information in the time domain.

In an optional embodiment, the ACK information or NACK information corresponds to a preamble configured by the base station, and the indication information and/or configuration information includes random access channel configuration information. The sequence representing the ACK information or the NACK information is preferably a preamble sequence preamble in a physical random access channel PRACH, and the feedback indication information is PRACH configuration information for determining the preamble used by the terminal for feeding back the ACK information or the NACK.

In an optional embodiment, when the base station determines that the unicast service carried in the fast message received and demodulated by the terminal is correct, or when the unicast service carried in the fast message received and demodulated by the terminal is incorrect, the ACK information is fed back, where the feedback indication information includes configuration information of a preamble corresponding to the indicated ACK information and configuration information of a preamble corresponding to the indicated NACK information; when the base station determines that the unicast service carried in the terminal receiving and demodulating quick message is correct, the base station feeds back ACK information, and when the terminal receiving and demodulating the unicast service carried in the quick message is incorrect, the terminal does not feed back information, and the feedback indication information comprises configuration information of a lead code corresponding to the indicated ACK information; when the base station determines that the unicast service carried in the fast message received and demodulated by the terminal is correct, the base station does not feed back information, and when the unicast service carried in the fast message received and demodulated by the terminal is wrong, the base station feeds back NACK information, the feedback indication information comprises configuration information of a lead code corresponding to the indicated NACK information. When determining that a terminal receives a correct feedback ACK of a unicast service carried in a demodulation quick message, receiving an incorrect feedback NACK of the unicast service carried in the demodulation quick message, wherein the feedback indication information comprises configuration information indicating preambles corresponding to the ACK and the NACK, namely the feedback indication information explicitly configures the preambles used by the ACK and the NACK, the information indicates 1 corresponding ACK in 64 preambles by using 6 bits, indicates 1 corresponding NACK in the 64 preambles by using 6 bits, and indicates a PRACH MASK Index MASK Index by using 4 bits to indicate a subframe Index sent by the PRACH MASK Index; or the method for indicating ACK and NACK to use preamble also comprises using 6 bits to indicate 1 corresponding ACK of 64 preambles, and the next corresponding NACK; or the method for indicating ACK and NACK to use preamble further comprises using 11 bits to indicate that 2 different preambles in 64 preambles respectively correspond to ACK and NACK; (2) when determining that the terminal receives the correct feedback ACK of the unicast service carried in the demodulation quick message and receives the incorrect feedback of the unicast service carried in the demodulation quick message, the feedback indication information only comprises configuration information indicating a preamble corresponding to the ACK, namely the feedback indication information explicitly configures the preamble used by the ACK, the information indicates 1 corresponding ACK in 64 preambles by using 6 bits and indicates PRACHMASK Index by using 4 bits of information to indicate a subframe index sent by the information; (3) when it is determined that the terminal receives the unicast service carried in the demodulation quick message correctly and not feeds back, the terminal receives the unicast service carried in the demodulation quick message incorrectly and feeds back NACK, the feedback indication information only includes configuration information indicating a preamble corresponding to NACK, that is, the feedback indication information explicitly configures the preamble used by NACK, the information indicates 1 corresponding NACK in 64 preambles by using 6 bits, and indicates PRACH MASK Index by using 4 bits information, so as to indicate the subframe Index sent by the information.

Fig. 11 is a block diagram of a preferred structure of a downlink data transmitting apparatus according to an embodiment of the present invention, and as shown in fig. 11, the apparatus includes a third receiving module 112 and a second transmitting module 114 in addition to all modules shown in fig. 9, and the apparatus is explained below.

A third receiving module 112, connected to the sending module 92, for receiving the preamble fed back by the terminal; a second sending module 114, connected to the third receiving module 112, configured to send a random access response RAR message to the terminal when a preamble fed back by the terminal has a capability of feeding back ACK information or NACK information and the preamble fed back by the terminal has a capability of performing uplink random access at the same time; and when the preamble fed back by the terminal only has the capability of feeding back ACK (acknowledgement) information or NACK (negative acknowledgement) information, not sending a Random Access Response (RAR) message.

Fig. 12 is a block diagram of a preferred structure of a device for transmitting downlink data according to an embodiment of the present invention, and as shown in fig. 12, the device includes a stop module 122 in addition to all modules shown in fig. 9, and the device is described below.

A stopping module 122, connected to the sending module 92, configured to stop sending the fast message when the downlink data information includes a unicast service and at least one of the following conditions is satisfied: the base station receives the ACK information fed back by the terminal; the latency after the base station sends the fast message exceeds a predetermined threshold.

Fig. 13 is a block diagram of a downlink data receiving apparatus according to an embodiment of the present invention, which may be applied to a terminal, and as shown in fig. 13, the apparatus includes a fourth receiving module 132, which is described below.

The fourth receiving module 132 is configured to receive a fast message carrying downlink data information directly sent by the base station.

Fig. 14 is a block diagram of a preferred structure of a device for receiving downlink data according to an embodiment of the present invention, and as shown in fig. 14, the device includes a feedback module 142 and a transmission module 144 in addition to all modules shown in fig. 14, and the device is explained below.

A feedback module 142, connected to the fourth receiving module 132, for feeding back ACK information or NACK information to the base station; a transmission module 144, connected to the feedback module 142, configured to transmit the uplink fast transmission message immediately after the sequence carrying the ACK information or the NACK information in the time domain.

In an optional embodiment, when the terminal receives and demodulates that the unicast service carried in the fast message is correct, the ACK information is fed back, or receives and demodulates that the unicast service carried in the fast message is incorrect, the NACK information is fed back, where the feedback indication information includes configuration information of a preamble corresponding to the indicated ACK information and configuration information of a preamble corresponding to the indicated NACK information; when the terminal receives and demodulates the unicast service carried in the quick message correctly, the ACK information is fed back, and when the terminal receives and demodulates the unicast service carried in the quick message incorrectly, the ACK information is not fed back, and the feedback indication information comprises the configuration information of the lead code corresponding to the indicated ACK information; when the terminal receives and demodulates the unicast service carried in the fast message correctly without feeding back the information, and receives and demodulates the unicast service carried in the fast message incorrectly with feeding back the NACK information, the feedback indication information contains the configuration information of the lead code corresponding to the indicated NACK information. The terminal receives a unicast service correct feedback ACK carried in a demodulation quick message, receives a unicast service error feedback NACK carried in the demodulation quick message, wherein the feedback indication information comprises configuration information of preamble corresponding to the indication ACK and the NACK, namely the feedback indication information explicitly configures the preamble used by the ACK and the NACK, the information uses 6 bits to indicate 1 corresponding ACK in 64 lead codes, uses 6 bits to indicate 1 corresponding NACK in the 64 lead codes, and uses 4 bits to indicate a PRACH MASK Index MASK Index to indicate a subframe Index sent by the PRACH MASK Index; or the method for indicating ACK and NACK to use preamble also comprises using 6 bits to indicate 1 corresponding ACK of 64 preambles, and the next corresponding NACK; or the method for indicating ACK and NACK to use preamble further comprises using 11 bits to indicate that 2 different preambles in 64 preambles respectively correspond to ACK and NACK; (2) the terminal receives a unicast service correct feedback ACK carried in the demodulation quick message, receives a unicast service error carried in the demodulation quick message and does not feed back, the feedback indication information only comprises configuration information indicating a preamble corresponding to the ACK, namely the feedback indication information explicitly configures the preamble used by the ACK, the information indicates 1 corresponding ACK in 64 preambles by using 6 bits, and indicates PRACHMASK Index by using 4 bits of information to indicate a subframe index sent by the information; (3) the terminal receives the unicast service carried in the demodulation quick message, the unicast service carried in the demodulation quick message is correct and not fed back, the unicast service carried in the demodulation quick message is incorrect and fed back NACK, the feedback indication information only comprises configuration information indicating a preamble corresponding to the NACK, namely the feedback indication information explicitly configures the preamble used by the NACK, the information indicates 1 corresponding NACK in 64 preambles by using 6 bits, and indicates PRACH MASK Index by using 4 bits, so as to indicate a subframe Index sent by the information.

In an optional embodiment, the preamble corresponding to the ACK information or the NACK information may or may not be used for uplink random access by the terminal, where the preamble that can be used for uplink random access by the terminal is different from the preamble that cannot be used for uplink random access by the terminal. That is, the feedback indication information is not only used for the terminal to feed back the preamble corresponding to the ACK information or the NACK information, but also used for indicating the preamble used by the terminal for uplink random access. That is, the terminal may further continue to complete the uplink synchronization process while performing the fast downlink data transmission. In other words, the preamble representing that the terminal feeds back ACK or NACK has two functions, one is used for feeding back ACK or NACK to perform correct or incorrect feedback on the fast downlink transmission so that the base station can obtain the acknowledgement information, and the other is used for uplink synchronization, and the preamble is used for simultaneously sending a preamble to the base station for the first step of the terminal in the random access process. The preamble used for terminal feedback ACK or NACK and uplink random access at the same time is different from the preamble used for terminal feedback ACK or NACK only, that is, both the two preambles are part of 64 preambles in a cell, and the two preambles are different.

Fig. 15 is a block diagram of a preferred structure of a downlink data receiving apparatus according to an embodiment of the present invention, and as shown in fig. 15, the apparatus includes a third sending module 152 and a fifth receiving module 154 in addition to all the modules shown in fig. 13, and the apparatus is described below.

A third sending module 152, connected to the fourth receiving module 132, for sending a preamble to the base station; a fifth receiving module 154, connected to the third sending module 152, configured to receive a random access response RAR message sent by the base station when the sent preamble has a capability of feeding back ACK information or NACK information and the preamble fed back by the terminal has a capability of performing uplink random access at the same time.

It should be noted that, the above modules may be implemented by software or hardware, and for the latter, the following may be implemented, but not limited to: the modules are all positioned in the same processor; alternatively, the modules are respectively located in a plurality of processors.

The embodiment of the invention also provides a storage medium. Alternatively, in the present embodiment, the storage medium may be configured to store program codes for performing the following steps:

and S1, when the base station needs to send the downlink service, the base station directly sends the fast message carrying the downlink data information.

Optionally, the storage medium is further arranged to store program code for performing the steps of:

and S1, the terminal receives the fast message carrying the downlink data information directly sent by the base station.

Optionally, in this embodiment, the storage medium may include, but is not limited to: various media capable of storing program codes, such as a usb disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic disk, or an optical disk.

Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments and optional implementation manners, and this embodiment is not described herein again.

The invention is illustrated below with reference to specific examples:

example 1

The present embodiment describes the method for transmitting downlink unicast data information according to the present invention in detail.

The base station has a requirement for sending downlink unicast service to a certain terminal, and sends fast message data carrying downlink unicast data information (where the fast message data may be a specific fast message, a paging message, or a broadcast message corresponding to a private RNTI scrambling, and the paging message is described later by way of example). When sending the paging message containing the downlink unicast service, the paging message carries the downlink data information of the user and simultaneously carries the feedback indication information corresponding to the downlink data information. Specifically, the downstream Data information ue-Data and the Feedback Indication information Feedback Indication are added in the Paging Record.

The terminal feedback acknowledgement or negative acknowledgement (ACK or NACK, hereinafter abbreviated as ACK/NACK) information configured by the feedback indication information is that the terminal receives the demodulation correct feedback ACK and receives the demodulation incorrect feedback NACK, and the feedback indication information includes configuration information indicating a preamble corresponding to the ACK and NACK. The information uses 6 bits to indicate 1 corresponding ACK in 64 lead codes, the next corresponding NACK, and 4 bits to indicate PRACH MASK Index, indicating the subframe Index sent by the information;

the terminal receives the paging message at the paging moment capable of receiving the paging message, acquires downlink user data sent by the base station by demodulating the paging record message block thereof according to the UE ID information, and simultaneously acquires preamble indication information for feeding back ACK/NACK. And the terminal receives correct downlink user data and feeds back a preamble representing ACK on a subframe indicated by the base station.

And after receiving the preamble corresponding to the ACK fed back by the terminal, the base station stops sending the paging message containing the unicast service of the terminal.

By using the downlink data transmission method provided by the embodiment, the problem that the time delay for transmitting the downlink data after the terminal wakes up/accesses the network from the idle state is large can be solved, so that the communication requirement of the terminal with low time delay requirement in the system is ensured.

Example 2

The present embodiment describes the method for transmitting downlink broadcast data information according to the present invention in detail.

The base station has a requirement that downlink broadcast service is sent to all terminals or a group of terminals in a cell, and sends fast message data carrying downlink broadcast data information (where the fast message data may be a specific fast message, a paging message, or a broadcast message corresponding to a scrambling of a private RNTI, and the paging message is described later by way of example). Wherein the broadcast/multicast message BroadcastInfo is added in the corresponding pagengmessage.

The terminal receives the paging message at the paging time capable of receiving the paging message, obtains the paging time according to the UE ID information, and obtains the broadcast/multicast message BroadcastInfo sent by the base station in the paging message.

The base station sends the paging message containing broadcast/multicast message BroadcastInfo, and periodically sends the message, and the terminal periodically receives the message. If the reception is correct, the idle mode can be continuously entered so as to save the power consumption, and if the reception is wrong, the reception can be continuously carried out at the paging moment until the reception is correct.

By using the downlink data transmission method provided by the embodiment, the problem that the time delay for transmitting the downlink data after the terminal wakes up/accesses the network from the idle state is large can be solved, so that the communication requirement that all terminals or a group of terminals with low time delay requirements in the system receive the same data information is ensured.

Example 3

The base station has a requirement for sending downlink unicast service to a certain terminal, wherein the data respectively comprises unicast data with low delay requirement and unicast data without low delay requirement. The base station sends fast message data carrying downlink unicast data information with low delay requirement (where the fast message data may be a specific fast message, a paging message, and a broadcast message corresponding to a scrambling of a private RNTI, and the paging message is described later by way of example). When sending the paging message containing the downlink unicast service, the paging message carries the downlink data information of the user and simultaneously carries the feedback indication information corresponding to the downlink data information. Wherein, the downstream Data information ue-Data and the Feedback Indication information Feedback Indication are added in the Paging Record.

The terminal feedback acknowledgement/negative acknowledgement (ACK/NACK) information configured by the feedback indication information is that the terminal receives a correct demodulation feedback ACK and receives a wrong demodulation feedback NACK, the feedback indication information comprises configuration information of a preamble corresponding to the indication ACK and the NACK, and the preamble is also used for uplink random access of the terminal. In other words, the preamble representing the terminal to feed back ACK/NACK has two functions, one is used for feeding back ACK/NACK to perform correct or incorrect feedback on the fast downlink transmission so that the base station can obtain the acknowledgement information, and the other is used for uplink synchronization, and the preamble is used for simultaneously sending a preamble to the base station for the first step of the terminal in the random access process. The information uses 6 bits to indicate one of 64 lead codes corresponding to ACK, the next corresponding NACK, and 4 bits to indicate PRACH MASK Index, which indicates the subframe Index sent by the information;

the terminal receives the paging message at the paging moment capable of receiving the paging message, acquires downlink user data sent by the base station by demodulating a paging record message block of the terminal according to the UE ID information, and simultaneously acquires feedback ACK/NACK and preamble indication information of random access. And the terminal receives correct downlink user data and feeds back a preamble representing ACK and random access on a subframe indicated by the base station.

And after receiving the preamble corresponding to the ACK fed back by the terminal, the base station stops sending the paging message containing the unicast service of the terminal. And simultaneously, the base station sends an RAR message to the terminal and completes uplink synchronization. And then the base station sends the remaining unicast data without the low delay requirement in a scheduling mode.

The downlink data transmission method provided by the invention can solve the problem that the time delay of transmitting the downlink data is larger after the terminal wakes up/accesses the network from the idle state, thereby ensuring the communication requirement of the terminal with low time delay requirement in the system.

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 transmitting downlink data, comprising:

when a base station needs to send downlink service, the base station directly sends a quick message carrying downlink data information without scheduling interaction;

wherein the downlink data information comprises a unicast service;

when the downlink data information includes the unicast service, the sending, by the base station, a fast message carrying the downlink data information includes: sending a fast message carrying downlink data information of one or more users;

when the downlink data information comprises the unicast service, the fast message at least carries feedback indication information used for a terminal to feed back the downlink data information in the fast message;

the feedback indication information includes: aiming at the unicast service carried in the quick message, indicating information for indicating a sequence for feeding back Acknowledgement (ACK) information or Negative Acknowledgement (NACK) information and/or configuration information for configuring the sequence for feeding back the ACK information or the NACK information;

the ACK information or NACK information corresponds to a preamble configured by the base station.

2. The method of claim 1,

the downlink data information further includes at least one of: multicast service, broadcast service;

the quick message includes at least one of: a special quick message scrambled by a private radio network temporary identity RNTI, a paging message, a broadcast message.

3. The method of claim 2,

when the downlink data information includes a multicast service and/or a broadcast service, the sending, by the base station, a fast message carrying the downlink data information includes: and sending the fast message carrying one or more multicast services and/or broadcast services.

4. The method according to claim 2, wherein when the downlink data information includes the unicast service and the fast message includes the specific fast message scrambled by the private radio network temporary identity RNTI or a broadcast message, the fast message further carries terminal identity information corresponding to the downlink data information.

5. The method of claim 1, after sending the fast message carrying the downlink data information, further comprising:

the base station receives the ACK information or NACK information fed back by the terminal;

and the base station receives an uplink fast transmission message transmitted by the terminal, wherein the uplink fast transmission message is transmitted by the terminal after a sequence carrying the ACK information or the NACK information in a time domain.

6. The method according to claim 1, wherein the indication information and/or configuration information comprises random access channel configuration information.

7. The method of claim 6,

when the base station determines that the unicast service carried in the fast message received and demodulated by the terminal is correct, the ACK information is fed back, or the NACK information is fed back when the unicast service carried in the fast message received and demodulated by the terminal is incorrect, the feedback indication information includes configuration information of a lead code corresponding to the indicated ACK information and configuration information of a lead code corresponding to the indicated NACK information;

when the base station determines that the unicast service carried in the fast message is received and demodulated correctly by the terminal, the ACK information is fed back, and when the unicast service carried in the fast message is received and demodulated incorrectly by the terminal, the feedback indication information does not comprise the indicated configuration information of the lead code corresponding to the ACK information;

when the base station determines that the unicast service carried in the fast message received and demodulated by the terminal is correct, the base station does not feed back information, and when the unicast service carried in the fast message received and demodulated by the terminal is wrong, the NACK information is fed back, and the feedback indication information includes the indicated configuration information of the preamble corresponding to the NACK information.

8. The method according to claim 6, wherein the base station configures a preamble for feeding back the ACK information and the NACK information for the same terminal, and a root sequence of the preamble configured for feeding back the ACK information for the same terminal is the same and/or a cyclic shift step length of the preamble configured for feeding back the NACK information for the same terminal is the same.

9. The method of claim 6, wherein the preamble corresponding to the ACK information or the NACK information is a preamble determined by the base station according to a limited set of root sequences and/or a limited set of cyclic shift categories.

10. The method of claim 6,

the time domain length of the preamble configured by the base station is less than or equal to one subframe length;

when the time domain length of the preamble configured by the base station is smaller than one subframe length, the feedback indication information further includes indication information for indicating a used Orthogonal Frequency Division Multiplexing (OFDM) symbol position in a subframe, where the used OFDM symbol position is an OFDM symbol position where the preamble configured by the base station is located.

11. The method of claim 6, wherein the preamble configured by the base station is usable or unusable for uplink random access by the terminal, and wherein the preamble usable for uplink random access by the terminal is different from the preamble unusable for uplink random access by the terminal.

12. The method of claim 11, wherein after directly sending the fast message carrying the downlink data information, the base station further comprises:

the base station receives a lead code fed back by the terminal;

when a lead code fed back by a terminal has the capability of feeding back ACK (acknowledgement character) information or NACK (negative acknowledgement) information and the lead code fed back by the terminal simultaneously has the capability of performing uplink random access, the base station sends a Random Access Response (RAR) message to the terminal;

and when the lead code fed back by the terminal only has the capability of feeding back ACK (acknowledgement character) information or NACK (negative acknowledgement character) information, the base station does not send a Random Access Response (RAR) message.

13. The method of claim 1, wherein when the downlink data information includes the unicast service, the base station further includes, after directly sending a fast message carrying the downlink data information:

the base station stops sending the fast message when at least one of the following conditions is met:

the base station receives Acknowledgement (ACK) information fed back by the terminal;

the waiting time after the base station sends the fast message exceeds a predetermined threshold.

14. A method for receiving downlink data, comprising:

a terminal receives a quick message which is directly sent by a base station without scheduling interaction and carries downlink data information;

the downlink data information comprises unicast service;

when the downlink data information comprises the unicast service, the fast message at least carries feedback indication information used for the terminal to feed back the downlink data information in the fast message;

the feedback indication information includes: the indication information is used for indicating the terminal to feed back a sequence of Acknowledgement (ACK) information or Negative Acknowledgement (NACK) information to the unicast service carried in the quick message, and/or the configuration information is used for configuring the sequence of the Acknowledgement (ACK) information or the Negative Acknowledgement (NACK) information to the unicast service fed back by the terminal to the quick message;

15. The method of claim 14,

16. The method of claim 14, wherein after receiving the fast message carrying downlink data information sent by the base station, the terminal further includes:

the terminal feeds back the ACK information or NACK information to the base station;

and the terminal transmits the uplink quick transmission message next to the sequence carrying the ACK information or the NACK information in the time domain.

17. The method according to claim 14, wherein the indication information and/or configuration information comprises random access channel configuration information.

18. The method of claim 17,

when the terminal receives and demodulates that the unicast service carried in the quick message is correct, the ACK information is fed back, or when the NACK information is fed back when the unicast service carried in the quick message is wrong, the feedback indication information comprises the configuration information of the lead code corresponding to the ACK information and the configuration information of the lead code corresponding to the NACK information;

when the terminal receives and demodulates that the unicast service carried in the quick message is correct, the ACK information is fed back, and when the terminal receives and demodulates that the unicast service carried in the quick message is incorrect, the ACK information is not fed back, and the feedback indication information comprises the configuration information of the lead code corresponding to the ACK information;

when the terminal receives and demodulates that the unicast service carried in the quick message is correct, the terminal does not feed back information, and receives and demodulates that the unicast service carried in the quick message is wrong, and feeds back the NACK information, the feedback indication information includes the configuration information of the lead code corresponding to the NACK information.

19. The method according to claim 17, wherein the preamble corresponding to the ACK information and the preamble corresponding to the NACK information are preambles configured by the base station respectively, and a root sequence of the preamble corresponding to the ACK information and a root sequence of the preamble corresponding to the NACK information are the same and/or a cyclic shift step size is the same.

20. The method of claim 17, wherein the preamble corresponding to the ACK information or the NACK information is a preamble determined by the base station according to a limited set of root sequences and/or a limited set of cyclic shift categories.

21. The method of claim 17,

the time domain length of the lead code corresponding to the ACK information or the NACK information is less than or equal to one sub-frame length;

when the time domain length of a preamble corresponding to ACK information or NACK information is smaller than one subframe length, the feedback indication information further includes indication information for indicating a position of an orthogonal frequency division multiplexing OFDM symbol used in a subframe, where the used position of the OFDM symbol is an OFDM symbol position where the preamble configured by the base station is located.

22. The method of claim 17, wherein a preamble corresponding to the ACK information or the NACK information is usable or unusable for uplink random access by the terminal, and wherein the preamble usable for uplink random access by the terminal is different from the preamble unusable for uplink random access by the terminal.

23. The method of claim 22, wherein after receiving the fast message carrying downlink data information sent by the base station, the terminal further comprises:

the terminal sends a lead code to the base station;

and when the lead code sent by the terminal has the capability of feeding back ACK (acknowledgement character) information or NACK (negative acknowledgement character) information and the lead code fed back by the terminal simultaneously has the capability of performing uplink random access, the terminal receives a Random Access Response (RAR) message sent by the base station.

24. A downlink data transmission apparatus, located at a base station, includes:

the sending module is used for directly sending the quick message carrying the downlink data information without scheduling interaction when the downlink service needs to be sent;

the downlink data information comprises unicast service;

when the downlink data information comprises the unicast service, the base station sends a quick message carrying the downlink data information in the following mode: sending a fast message carrying downlink data information of one or more users;

the ACK information or NACK information corresponds to a preamble configured by a base station;

and the first receiving module is used for receiving the ACK information or NACK information fed back by the terminal.

25. The apparatus of claim 24,

26. The apparatus of claim 24, further comprising:

and a second receiving module, configured to receive an uplink fast transmission message transmitted by the terminal, where the uplink fast transmission message is transmitted by the terminal after a sequence carrying the ACK information or the NACK information in a time domain.

27. The apparatus of claim 24, wherein the indication information and/or configuration information comprises random access channel configuration information.

28. The apparatus of claim 27, wherein the preamble configured by the base station is usable or unusable for uplink random access by the terminal, and wherein the preamble usable for uplink random access by the terminal is different from the preamble unusable for uplink random access by the terminal.

29. The apparatus of claim 28, further comprising:

a third receiving module, configured to receive a preamble fed back by the terminal;

a second sending module, configured to send a random access response RAR message to a terminal when a preamble fed back by the terminal has a capability of feeding back ACK information or NACK information and the preamble fed back by the terminal has a capability of performing uplink random access at the same time; and when the preamble fed back by the terminal only has the capability of feeding back ACK (acknowledgement) information or NACK (negative acknowledgement) information, not sending a Random Access Response (RAR) message.

30. The apparatus of claim 24, wherein when the downlink data information includes the unicast traffic, further comprising: a stopping module, configured to stop sending the fast message by the base station when at least one of the following conditions is met:

31. A downlink data receiving apparatus, located at a terminal side, comprising:

the fourth receiving module is used for receiving the fast message which is directly sent by the base station without scheduling interaction and carries the downlink data information;

the downstream data information includes a unicast service,

the ACK information or NACK information corresponds to a preamble configured by the base station;

and the feedback module is used for feeding back the ACK information or the NACK information to the base station.

32. The apparatus of claim 31,

the downlink data information includes at least one of: multicast service, broadcast service;

33. The apparatus of claim 31, further comprising:

and the transmission module is used for transmitting the uplink fast transmission message next to the sequence carrying the ACK information or the NACK information in the time domain.

34. The apparatus of claim 31, wherein the indication information and/or configuration information comprises random access channel configuration information.

35. The apparatus of claim 34, wherein a preamble corresponding to the ACK information or the NACK information is usable or unusable for uplink random access by the terminal, and wherein the preamble usable for uplink random access by the terminal is different from the preamble unusable for uplink random access by the terminal.

36. The apparatus of claim 35, further comprising:

a third sending module, configured to send a preamble to the base station;

a fifth receiving module, configured to receive a random access response RAR message sent by the base station when the sent preamble has a capability of feeding back ACK information or NACK information and the preamble fed back by the terminal has a capability of performing uplink random access at the same time.