KR20200027048A - Method, apparatus, terminal, base station and method for transmitting the information - Google Patents

Abstract

The present invention discloses a method for receiving scheduling information, the method comprising receiving downlink control information (DCI); And determining scheduling information corresponding to the PUSCH in the DCI according to a mapping relationship between the set transmission resource used for the physical uplink shared channel (PUSCH) and the scheduling information in the DCI. Compared with the prior art, in the present invention, the scheduling information in DCI is determined by the mapping relationship between the set transmission resource used for transmitting the PUSCH by the UE and the scheduling information in DCI, so that the base station can determine only one DCI fragment. By transmitting, it is possible to schedule all UEs having a mapping relationship between the PUSCH configuration transmission resource and the scheduling information of the DCI. Scheduling overhead is reduced, resource waste is reduced, and the efficiency of the scheduling terminal by the communication system is significantly improved.

Description

Method, apparatus, terminal, base station and method for transmitting the information

TECHNICAL FIELD The present invention relates to the field of wireless communications technologies, and in particular, to a method and apparatus for receiving scheduling information and a terminal, base station and method for transmitting information.

Efforts have been made to develop improved 5G (5th generation) or pre-5G communication systems to meet the demand for increased wireless data traffic after deployment of 4G (4th generation) communication systems. Therefore, 5G or pre-5G communication system is also referred to as 'beyond 4G network' or 'post LTE system'.

5G communication systems are considered to be implemented in the higher frequency (mmWave) band, i.e. the 60 GHz band, to achieve higher data rates. In order to reduce radio wave propagation loss and increase transmission coverage, beamforming, multiple-input multiple-output (MIMO), full dimensional MIMO (FD-MIMO), array antenna, analog beamforming, large-scale antenna technology, etc. Discussed in 5G communication systems.

In addition, in 5G communication systems, advanced small cells, cloud radio access networks (RANs), ultra-dense networks, device-to-device (D2D) communications, wireless backhaul, mobile networks, cooperative communications, CoMP ( Coordinated Multi-Point) Development is underway to improve the system network based on transmission and reception, interference mitigation and cancellation.

In 5G systems, hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC) as advanced coding modulation (ACM), and filter bank multi carrier (FBMC) as a advanced access technology, non-orthogonal multiple access (NOMA) And spread code multiple access (SCMA) have been developed.

In current machine type communication (MTC) technology, the system supports scheduling of Early Termination Signals (ETS) for user equipment (UE) by downlink control information (DCI), that is, The base station transmits the ETS to the user equipment (UE) by DCI on the Physical Downlink Control Channel (PDCCH) to schedule time-frequency resources for the Physical Uplink Shared Channel (PUSCH) used by the UE. When the ETS is transmitted by Hybrid Automatic Retransmission Request Acknowledgement (HARQ-ACK) feedback, one DCI piece may represent ACK information of only one UE / HARQ process, i.e., MTC technology may use one DCI. Only the scheduling of ETS for one UE in the fragment is supported. The length of the scheduling signaling is the same as in DCI format 6-0A / B. In this way, the extra information overhead is so large that large resource waste will be incurred when there are multiple UEs to be fed back.

Long Term Evolution (LTE) technology supports transmission power control and scheduling for multiple UEs in one DCI fragment by DCI transmission scheduling information in DCI format 3 / 3A. However, in legacy DCI in DCI format 3 / 3A, the mapping relationship between the UE and the Transmit Power Control (TPC) command field is established by higher layer signaling, which is less flexible and allows the UE to transmit or downlink each uplink. It is not applicable to application scenarios where it is necessary to flexibly perform ACK (Acknowledgement) feedback for link control channel monitoring. Therefore, this cannot be used in the MTC system.

In view of this, there is a need to provide a method and apparatus for receiving scheduling information that can solve the above technical problem.

In addition, Enhanced Machine Type Communication (eMTC), a technology type of Internet of Things (IoT) applications, was first announced in Release 13 of the 3GPP protocol, primarily for IoT applications deployed in LTE systems.

Compared with the business of traditional wireless communications, IoT applications for eMTC technology feature less data volume, rare service requests, lower latency sensitivity and deeper coverage. Examples include intelligent meter reading, automatic alarms, monitoring and logistics tracking, and other types of applications.

Compared to LTE terminals, eMTC terminals are likely to be in deep coverage scenarios such as basement or underground tube wells, and eMTC has introduced several mechanisms and technologies to improve coverage. One of the most basic coverage enhancement techniques is not only to introduce repetitive transmission mechanisms, but also to reduce the transmission bandwidth to improve power spectral density.

In terms of improving power spectral density, eMTC reduces transmission bandwidth only to 1080kHz, and eMTC narrowband consists of six adjacent Physical Resource Blocks (PRBs) in an LTE system. Full physical channel scheduling of eMTC uses the eMTC narrowband as one unit. The number of narrowbands and the location of the in-band eMTCs may both differ. For example, when the LTE system bandwidth is 3 MHz, the number of in-band eMTC narrowbands is two; When the LTE system bandwidth is 20 MHz, the number of in-band eMTC narrowband is 16.

In coverage enhancement, in eMTC technology, the terminal selects the coverage enhancement mode (coverage enhancement (CE) mode) of the random access channel according to the DL measurement. The base station acquires a coverage enhancement mode (CE mode) of the terminal based on the coverage level (CE level) of the random access channel selected by the terminal, and according to the CE mode of the terminal, uplink (UL) and downlink (DL) traffic Perform channel transmission. The CE mode of the terminal is classified into mode A (CE mode A) and mode B (CE mode B). Here, CE mode A is used to support only normal coverage scenarios, that is, small repetition number transmission and non-repetitive transmission supporting the UL and DL control channel and the service channel; CE mode B is used to support the UL and DL control channels to support deep coverage scenarios, ie to transmit with a large repetition number.

In different CE modes, the format of the UL and DL scheduling grant information read by the terminal is slightly different. In Release 14, the UL scheduling grant information of CE mode B is DCI format 6-0B, and the content is shown in Table 1 below.

TABLE 1

Here, DCI format 6-0B represents a narrowband index used for physical uplink share channel (PUSCH) transmission and a narrowband PRB index in a resource block allocation message. For user equipment in CE mode B, the base station schedules the UL shared channel to use a single PRB or 2 PRB transmission in narrowband to reduce UL power spectral density and improve coverage capability.

Next-generation mechanical communication systems place high demands on improved coverage. Although new CE modes have emerged according to the times, the method of transmitting data between the terminal and the base station in the new CE mode is an important problem.

Next-generation mechanical communication systems place high demands on improved coverage. Although new CE modes have emerged according to the times, the method of transmitting data between the terminal and the base station in the new CE mode is an important problem.

It is an object of the present invention to provide a method and apparatus for receiving scheduling information in which multiple UEs can be scheduled by one DCI fragment to overcome the deficiencies of the prior art.

An embodiment of the present invention provides a base station. Compared with the prior art, in the embodiment of the present invention, the terminal determines whether the base station supports the first scheduling mode according to the setting information of the first scheduling mode transmitted by the base station, and when the base station supports the first scheduling mode The terminal sends a request message and / or a capability message to the base station to request that the base station establish a first scheduling mode for the terminal or report a scheduling mode supported by the terminal. When the base station receives a request message and / or a capability message sent by the terminal and determines that the terminal scheduling mode is the first scheduling mode, the base station transmits scheduling information to the terminal under the first scheduling mode, and the terminal receives the first scheduling. In the mode, data is transmitted and received according to the scheduling information. That is, in the embodiment of the present invention, a new scheduling mode, that is, the first scheduling mode, is shown in the embodiment of the present invention. When both the terminal and the base station support the first scheduling mode, the base station transmits scheduling information to the terminal under the first scheduling mode, so that the terminal and the base station can transmit and receive data in the new scheduling mode.

The terminal and the base station provided in the embodiment of the present invention may implement the above-described method embodiment. For specific functional implementations, reference is made to the description in the method embodiments, and details are not described herein again.

BRIEF DESCRIPTION OF DRAWINGS To describe the technical solutions in the embodiments of the present invention more clearly, the accompanying drawings to be used in the description of the embodiments will be briefly described below. Apparently, the accompanying drawings described below are some embodiments of the present invention, and a person of ordinary skill in the art may obtain other drawings according to these drawings without any creative effort.
1 is a flowchart of a method for receiving scheduling information in accordance with the present invention.
2 is a schematic diagram of time-frequency resources in a process of receiving scheduling information according to Embodiment 3 of the present invention.
3 is a schematic diagram of a first correspondence between DCI and scheduled time-frequency resources in accordance with embodiment 4 of the present invention.
4 is a schematic diagram of a second correspondence between DCI and scheduled time-frequency resources in accordance with embodiment 4 of the present invention.
5 is a schematic diagram of a first correspondence between a minimum scheduling unit in a time-frequency resource region and a UE / HARQ process according to Embodiment 5 of the present invention.
6 is a schematic diagram of a second correspondence between a minimum scheduling unit in a time-frequency resource region and a UE / HARQ process according to Embodiment 5 of the present invention.
7 is a schematic diagram of a third correspondence relationship between a minimum scheduling unit in a time-frequency resource region and a UE / HARQ process according to Embodiment 5 of the present invention.
8 is a schematic diagram of a fourth correspondence between a minimum scheduling unit in a time-frequency resource region and a UE / HARQ process according to Embodiment 5 of the present invention.
9 is a schematic diagram of using HARQ-ACK to schedule an ETS by DCI according to Embodiment 6 of the present invention.
10 is a schematic diagram of a first example of setting of a newly defined search space according to Embodiment 7 of the present invention.
11 is a schematic diagram of a second example of setting of a newly defined search space according to Embodiment 7 of the present invention.
12 is a schematic diagram of a third example of setting of a newly defined search space according to Embodiment 7 of the present invention.
13 is a schematic diagram of a fourth example of setting of a newly defined search space according to Embodiment 7 of the present invention.
14 is a schematic diagram of a fifth example of setting of a newly defined search space according to Embodiment 7 of the present invention.
15 is a schematic diagram of a sixth example of setting of a newly defined search space according to Embodiment 7 of the present invention.
16 is a schematic diagram of applying a scheduling information receiving method to a grant-free communication scenario according to Embodiment 7 of the present invention.
17 is a schematic diagram of applying a method of receiving scheduling information to a semi-persistently scheduling scenario (SPS) according to Embodiment 8 of the present invention.
18 is a block diagram of a module of a user equipment used in a method of receiving scheduling information in accordance with the present invention.
19 is a schematic flowchart of a data transmission method by a terminal according to an embodiment of the present invention.
20 is a schematic flowchart of a data transmission method by a base station according to an embodiment of the present invention.
21 is a schematic diagram of an interactive flow of data transmission performed by a base station and a terminal according to an embodiment of the present invention.
22 is a schematic diagram of an exemplary terminal flow in which a terminal implicitly and explicitly reports a CE mode C request (or capability) in accordance with an embodiment of the present invention.
23 is a schematic diagram of physical resource mapping of a PUSCH according to an embodiment of the present invention.
24 is a schematic diagram of a terminal flow in which a terminal implicitly reports a CE mode C request (or capability) according to an embodiment of the present invention.
25 is a schematic diagram of a terminal flow of a terminal for reporting a CE mode C request (or capability) in an explicit signaling manner according to an embodiment of the present invention.
26 is a structural diagram of an apparatus of a terminal according to an embodiment of the present invention.
27 is a schematic structural diagram of an apparatus of a base station according to an embodiment of the present invention.

It is an object of the invention to provide a method and apparatus for receiving scheduling information in which a plurality of UEs can be scheduled by one DCI fragment to overcome the deficiencies of the prior art.

To this end, the present invention provides a method for receiving scheduling information.

Receiving downlink control information (DCI); And

Determining scheduling information corresponding to the PUSCH in the DCI according to a mapping relationship between the set transmission resource used for the physical uplink shared channel (PUSCH) and the scheduling information in the DCI.

Advantageously, receiving the DCI comprises receiving a DCI including scheduling information for one or multiple UEs.

Preferably, receiving the DCI comprises receiving the DCI by a radio network temporary identifier (RNTI) assigned by a base station.

Preferably, receiving the DCI comprises performing a Cyclic Redundancy Check (CRC) descrambling on a Physical Downlink Control Channel (PDCCH) candidate by a Radio Network Temporary Identifier (RNTI) assigned by a base station, and obtaining a DCI. Successfully decoding the PDCCH to perform the decoding.

Preferably, receiving the DCI includes receiving the DCIs having higher priority in order of priority. The priority order is used to determine the priorities of two types of DCIs, which are DCIs in which one DCI message carries scheduling information for one UE and one DCI message to multiple UEs. It includes a DCI carrying scheduling information for.

Preferably, the set transmission resource includes at least one of a time-frequency resource, a codeword and a demodulation reference signal (DMRS).

Preferably, the step of determining the scheduling information corresponding to the PUSCH in the DCI according to the mapping relationship between the set transmission resources used for the Physical Uplink Shared Channel (PUSCH) and the scheduling information in the DCI,

 Determining scheduling information corresponding to the PUSCH in the DCI according to the relative position of the time-frequency resource position used for the PUSCH in the first time-frequency resource region.

Preferably, the first time-frequency resource region is determined by agreement of the time-frequency resource location for the received DCI, or the content of the received DCI, or the configuration and / or specification of the base station.

Preferably, according to the relative position of the time-frequency resource location used for the PUSCH in the first time-frequency resource region, determining the scheduling information corresponding to the PUSCH in the DCI,

Dividing the time-frequency resource region into several minimum scheduling units;

Determining a mapping relationship between the minimum scheduling unit corresponding to the time-frequency resource location used to transmit the PUSCH and the scheduling information in the DCI; And

Determining scheduling information corresponding to the PUSCH in the DCI according to the mapping relationship.

Preferably, determining the mapping relationship between the minimum scheduling unit corresponding to the time-frequency resource location used to transmit the PUSCH and information scheduling in the DCI comprises numbering the minimum scheduling units in order, And determining a mapping relationship between the minimum number of scheduling units corresponding to the time-frequency resource location used to transmit the PUSCH and information scheduling in the DCI.

Preferably, according to the mapping relationship, determining the scheduling information corresponding to the PUSCH in the DCI includes determining a scheduling field in the DCI according to the mapping relationship and obtaining scheduling information in the scheduling field.

Preferably, the scheduling information includes acknowledgment (ACK) information indicating the decoded state of the PUSCH, NACK information indicating the decoded state of the PDSCH and indication information indicating the end of monitoring of the physical downlink control channel (PDCCH). indication information).

Preferably, after determining the scheduling information corresponding to the PUSCH in the DCI according to the mapping relationship between the established transmission resource used for the physical uplink shared channel (PUSCH) and the scheduling information in the DCI, the method may include: If the scheduling information is an acknowledgment (ACK),

Terminating the ongoing PUSCH transmission corresponding to the acknowledgment (ACK) information;

Clearing a UL grant corresponding to the PUSCH;

Releasing the remaining portion of the transmission resource for the PUSCH;

Clearing a buffer of a Hybrid Automatic Retransmission Request (HARQ) process corresponding to the PUSCH; And

Executing at least one of the steps of terminating monitoring of the physical downlink control channel (PDCCH).

Preferably, after determining the scheduling information corresponding to the PUSCH in the DCI according to the mapping relationship between the established transmission resource used for the physical uplink shared channel (PUSCH) and the scheduling information in the DCI, the method may include: If the scheduling information is an acknowledgment (ACK), within a predefined time window or at a predefined time point,

Terminating the ongoing PUSCH transmission corresponding to the acknowledgment (ACK) information;

Clearing a UL grant corresponding to the PUSCH;

Releasing the remaining portion of the transmission resource for the PUSCH;

Clearing a buffer of a Hybrid Automatic Retransmission Request (HARQ) process corresponding to the PUSCH; And

Executing at least one of the steps of terminating monitoring of the physical downlink control channel (PDCCH).

To this end, the present invention further provides a user device, the user device,

A downlink control information obtaining module, configured to obtain downlink control information (DCI); And

And a scheduling information determination module configured to determine scheduling information corresponding to the PUSCH in the DCI according to a mapping relationship between the configured transmission resource used for the physical uplink shared channel (PUSCH) and the scheduling information in the DCI.

To this end, the present invention further provides a method for transmitting scheduling information.

Attempting to receive and decode a physical uplink shared channel (PUSCH) of a plurality of UEs in a first uplink time-frequency resource region;

Scheduling information corresponding to the PUSCHs of the plurality of UEs according to the decoded state of the PUSCHs of the plurality of UEs;

Mapping relationship, wherein the mapping relationship is used to map the set transmission resources used for the PUSCHs of the plurality of UEs to corresponding scheduling fields in the DCI, respectively, and accordingly, downlink control including scheduling information for the PUSCHs of the plurality of UEs. Generating information (DCI); And transmitting the DCI.

Compared with the prior art, the present invention is not limited to the following technical effects: The scheduling information in the DCI is determined by the mapping relationship between the set transmission resource used for transmitting the PUSCH by the UE and the scheduling information in the DCI. By doing so, the base station can schedule all UEs that have a mapping relationship between PUSCH-configured transmission resources and scheduling information in DCI by transmitting only one DCI fragment, thereby reducing scheduling overhead and reducing resource waste. The efficiency of the scheduling terminal by the system is significantly improved.

In order to overcome the above technical problem or at least partially solve the above technical problem, the following technical solution is proposed:

According to one aspect, an embodiment of the present invention provides a data transmission method applied to a terminal, the method comprising:

Determining, according to the setting information of the first scheduling mode transmitted by the base station, whether the base station supports the first scheduling mode;

The frequency scheduling granularity used by the first scheduling mode is subcarrier level scheduling.

If the base station supports the first scheduling mode, the terminal sends a request message and / or capability message to the base station, the request message is used to request the base station to set the first scheduling mode for the terminal, the capability message is the terminal Used to report the scheduling mode supported by.

The terminal receives the scheduling information under the first scheduling mode transmitted by the base station, and transmits and receives data according to the scheduling information under the first scheduling mode.

According to another aspect, an embodiment of the present invention further provides another method for transmitting data applied to a base station, wherein the method includes:

When the base station supports the first scheduling mode, broadcasting a configuration message of the first scheduling mode;

Request message and / or capability message sent by the terminal, the request message being used to request the base station to set up the terminal for the first scheduling mode, and the capability message being used to report the scheduling mode supported by the terminal. It includes a step.

When the terminal scheduling mode is the first scheduling mode, the base station transmits scheduling information to the terminal under the first scheduling mode, so that the terminal may transmit and receive data according to the scheduling information under the first scheduling mode.

According to another aspect, an embodiment of the present invention provides a terminal, wherein the terminal,

A determining module, for determining whether the base station supports the first scheduling mode according to the setting information of the first scheduling mode transmitted by the base station;

Request message and / or capability message when the base station supports the first scheduling mode-The request message is used to request the base station to set the first scheduling mode for the terminal, and the capability message reports the scheduling mode supported by the terminal. Used a first transmission module for transmitting to the base station;

A first receiving module for receiving scheduling information of a first scheduling mode sent by a base station; And

And a data transmission module for transmitting and receiving data according to scheduling information under a first scheduling mode received by the first receiving module.

According to another aspect, an embodiment of the present invention provides a base station, wherein the base station includes:

A broadcasting module for broadcasting a configuration message in a first scheduling mode when the base station supports the first scheduling mode;

Request message and / or capability message sent by the terminal, the request message being used to request the base station to set a first scheduling mode for the terminal, and the capability message being used to report the scheduling mode supported by the terminal. A second receiving module; And

And a second transmitting module configured to transmit scheduling information of the first scheduling mode to the terminal when the terminal scheduling mode is the first scheduling mode such that the terminal transmits and receives data according to the scheduling information under the first scheduling mode.

The present invention provides a terminal, a base station and a data transmission method. Compared with the prior art, the terminal of the present invention determines whether the base station supports the first scheduling mode according to the setting information of the first scheduling mode transmitted by the base station, and if the base station supports the first scheduling mode, the terminal requests Send a message and / or capability message to the base station to request that the base station establish a first scheduling mode for the terminal or report the scheduling mode supported by the terminal. When the base station receives a request message and / or a capability message sent by the terminal, and determines that the scheduling mode of the terminal is the first scheduling mode, the base station transmits scheduling information to the terminal under the first scheduling mode, and the terminal receives the first message. In the scheduling mode, data is transmitted and received according to scheduling information. That is, in the present invention, compared with the prior art, the new scheduling mode is the first scheduling mode. When both the terminal and the base station support the first scheduling mode, the base station may transmit the scheduling information to the terminal under the first scheduling mode. Accordingly, the terminal and the base station can transmit and receive data in the new scheduling mode.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Hereinafter, embodiments of the present invention will be described in detail. Examples of such embodiments are shown in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements having the same or similar functions throughout the drawings. The embodiments described with reference to the accompanying drawings are exemplary and used only for describing the present invention, and should not be regarded as limiting the present invention.

Those skilled in the art should be construed that the singular forms “a”, “an”, “the” and “said” may be intended to include the plural forms as well, unless stated otherwise. Also, as used herein, the term "comprise / comprising" specifies the presence of the stated feature, integer, step, operation, element, and / or component, but one or more other It is to be understood that it does not exclude the presence or addition of features, integers, steps, actions, elements, components, and / or combinations thereof A component is "connected" or "coupled" to another component. May be directly connected to or coupled to another element, or an intervening element may be provided. In addition, as used herein, “connected” or “coupled” means a wireless connection or As used herein, the term “and / or” includes all or any one or more of the listed one or more associated items and combinations thereof.

Those skilled in the art, unless defined otherwise, mean that all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Should be understood. Terms such as those defined in the dictionary generally used should be interpreted to have a meaning consistent with the meaning in the context of the prior art, and shall have an ideal or excessively formal meaning unless specifically defined herein. Will not be interpreted.

Those skilled in the art can perform bidirectional communication over bidirectional communication links, as well as devices having wireless signal receivers where the terms "terminal" and "terminal device" as used herein do not have transmission capabilities. It should be understood that the device includes a device having transmit and receive hardware. Such devices include cellular or other communication devices having a single line display or a multi-line display or no multi-line display; Personal Communications Service (PCS) that combines the functions of voice, data processing, facsimile and / or data communication; Personal Digital Assistants (PDAs) that may include RF receivers, pagers, Internet network / intranet access, web browsers, notepads, calendars, and / or global positioning system (GPS) receivers; And / or other devices having and / or including conventional laptop and / or palmtop computers or RF receivers. “Terminal” or “terminal device” as used herein is portable, transportable, installable in transport (air, sea and / or land), adapted and / or configured to be implemented locally. And / or distributed in other places of the earth and / or space for execution. "Terminal" or "terminal device" as used herein may be a communication terminal, an internet terminal, a music / video player terminal. For example, it can be a mobile phone with a PDA, a Mobile Internet Device (MID) and / or music / video playback, or a device such as a smart TV, set-top box.

An embodiment of the present invention provides a method for transmitting scheduling information, whereby a plurality of UEs can be scheduled by one DCI fragment, and such a scheduling mechanism can be used at any given point of time with less overhead and greater flexibility. It may correspond to a real time transmission condition. In addition, in a typical scenario such as grant-free uplink transmission in which the base station sets up the same resource pool for multiple UEs and the UE selects transmission resources in a competitive manner, this mechanism is efficient and reliable scheduling for this scenario. Can provide a way.

Referring to FIG. 1, a method for receiving scheduling information according to an embodiment of the present invention is as follows.

Step 101: receiving downlink control information (DCI); And

Step 102: determining scheduling information corresponding to the PUSCH in the DCI according to a mapping relationship between the set transmission resource used for the Physical Uplink Shared Channel (PUSCH) and the scheduling information in the DCI.

According to an embodiment of the present invention, a method of transmitting scheduling information may include:

Step 201: attempting to receive and decode a physical uplink shared channel (PUSCH) of a plurality of UEs in a first uplink time-frequency resource region;

Step 202: generating, according to the decoded state of the PUSCHs of the plurality of UEs, scheduling information corresponding to the PUSCHs of the plurality of UEs;

Step 203: The mapping relationship, wherein the mapping relationship is used to map the established transmission resources used for the PUSCHs of the plurality of UEs to the corresponding scheduling fields in the DCI, respectively, includes scheduling information for the PUSCHs of the plurality of UEs. Generating downlink control information (DCI); And

Step 204: include transmitting a DCI.

A method of receiving scheduling information according to an embodiment of the present invention will be described in detail below.

I. The UE performs uplink data transmission on the PUSCH, the base station receives the PUSCH transmission for the UE, and schedules the UE by DCI. Specifically, the base station performs HARQ-ACK feedback for the UL PUSCH transmission for the UE by the DCI according to the received state (reception success / reception failure) of the PUSCH transmission for the UE.

The UE, upon receiving the DCI from the base station, determines the subsequent operation according to the content of the DCI. For example, the UE receives a DCI from a base station, obtains an ACK feedback message, and then performs the following actions: terminating the ongoing PUSCH transmission corresponding to the ACK information; Clearing the established corresponding uplink grant; Releasing the remaining portion of the scheduled PUSCH transmission resources from the base station; Clearing the buffer of the HARQ process; And a physical downlink control channel (PDCCH) (PDCCH may be MPDCCH, EPDCCH, and NPDCCH).

II. When a base station schedules a UE by DCI, one DCI fragment carries scheduling information for one UE (shortly referred to in the specification as a single DCI for ease of explanation), and one DCI fragment is assigned to multiple UEs. It carries scheduling information about the network (shortly referred to as group DCI in the specification for ease of explanation), and both a single DCI and a group DCI can be used.

(I) When both a single DCI and a group DCI are used, there is a specific priority relationship between the two types of DCI. If the UE receives the type of DCI at the same time and both types of DCI indicate different uplink scheduling information, the UE always gives priority to the result of a particular type of DCI, or the UE has a DCI (Single DCI / Group DCI) Or determine the priority of the DCI according to the scheduled object based on the DCI format or the returned content (eg, used to transmit A / N feedback (ACK / NACK feedback) or UL grant for scheduling). The priority relationship may be preset or set by higher layers.

1. In addition, two possible priority relationships are considered: data transmission scheduling message> other single DCI> other group DCI; Or data transmission scheduling message> single DCI carry NACK> group DCI carry ACK> single DCI carry ACK> group DCI carry NACK. Specifically, if the UE receives ACK information in the group DCI while retransmission is scheduled in a single DCI (eg, the retransmission is represented by a new data indicator (NDI)), the UE is in a single DCI. Resend according to the scheduling information. When the base station needs resources occupied by the current uplink transmission for the UE, and the UE requests to release the uplink resources, the base station may indicate ACK information by the group DCI, so that the UE is currently uplink transmission But the UE will not clear the HARQ buffer. In this case, the base station may not be able to successfully decode the uplink transmission. When there is an uplink resource that may be scheduled for the UE to continue to uplink transmission later, the base station may again trigger the HARQ buffer to perform retransmission by a single DCI.

(II) When a given UE fails to acquire any type of DCI after satisfying a preset condition (e.g., a timer is started after UL transmission is completed, and no ACK / NACK message is received after the timer expires). If not), the UE uses the preset processing result (eg, it is regarded as ACK or NACK). For example, it is assumed as ACK (UE sends ACK message to upper layer and clears HARQ buffer) or NACK and retransmission are performed according to predefined rules, e.g. after 4 milliseconds It is assumed that it can be performed at the same frequency domain resource location.

III. For a single DCI in item II, specifically, when the base station transmits HARQ-ACK as an ETS for the UE by a single DCI, the legacy DCI format uses format 6-0A / B in eMTC, for example. Operations of the type to be terminated by carrying the ETS include terminating PUSCH transmissions, terminating PDCCH monitoring, or both.

(I) is shown to return the ETS in at least one of the following manners.

1. using a value that is not currently used in a particular field of a legacy DCI format;

2. A way to change the definition of some of the fields in the legacy DCI format; And

3. The manner in which all other fields of the legacy DCI format are set as predetermined values, eg, all "1" or all "0".

(II) When a base station needs to terminate a PUSCH transmission for a UE by a single DCI, this may be implemented by one or more of the following solutions:

1. terminating one particular HARQ process by the value of one particular field;

2. terminating all HARQ processes by the value of one specific field; And

3. Terminating one or more of the plurality of HARQ processes by bitmap, eg, this can be implemented by changing some of the fields in the DCI format.

(III) In a single DCI, PUSCH transmission for a UE is terminated by using a value of one specific field, and / or PDCCH monitoring for the UE is terminated by using a value of one specific field, and / or PUSCH transmission and PDCCH monitoring are terminated by using the value of one specific field.

IV. For group DCI of item II, the base station generates a group DCI according to a specific UL time-frequency resource region, and the group DCI is used to schedule all or part of the UE performing transmission in the time-frequency resource region.

(I) The base station sets up one or more group RNTIs for the UE by higher layer signaling, and the UE decodes the group DCI given by its group RNTI. If a given group DCI is successfully decoded, it is assumed that there is scheduling content for the UE in DCI.

(II) There may be a relationship between the group RNTI and the established transmission resource corresponding to the group DCI. For example, several set transmission resources are preset, and a mapping relationship between several group RNTIs and several set transmission resources is preset. The UE obtains the established transmission resource corresponding to the group DCI according to the group RNTI used to successfully decode the group DCI.

V. The particular UL time-frequency resource region in item IV may be determined in one or more of the following ways.

(I) The specific UL time-frequency resource region is determined based on the transmission of time-frequency resources for the group DCI according to the mapping relationship predefined or set by the higher layer. For example, the UE receives and successfully decodes the group DCI in subframe n (the subframe may be a timeslot, resource unit or minimum scheduling time unit), which is a specific UL time-frequency resource corresponding to the group DCI. The area is determined according to the mapping relationship set by the higher layer located in subframe n-4.

(II) Certain UL time-frequency resource regions are carried directly or indirectly in group DCI. For example, the number of Physical Resource Blocks (PRBs) at the start frequency domain location of a particular UL time-frequency resource region corresponding to the group DCI is represented by a message field in the group DCI.

(III) The specific UL time-frequency resource region is set by the base station and / or predefined in advance by the protocol. For example, several established transmission resources are preset and numbered in sequence. In addition, the number of corresponding specific UL time-frequency resource regions is carried in the group DCI, or the UE selects the number of corresponding specific UL time-frequency resource regions according to the configured RNTI.

VI. In item IV, to distinguish all or part of the UE scheduled by the group DCI, a mapping relationship is established between the UE and the scheduling content in the group DCI.

(I) The transmission resource set for the UE is defined by any one or any combination thereof, i.e., the set transmission resource includes any one or combination of time-frequency resources, codewords or pilot signals. can do.

1. Based on the time-frequency resource, the particular UL time-frequency resource region of item IV is divided into several minimum scheduling units numbered in the order of the resource location, thereby providing a time-frequency resource location for PUSCH transmission by the UE. The corresponding minimum scheduling unit is set to the transmission resource

(1) There may be multiple UEs that perform transmissions on the minimum scheduling unit (these UEs are again distinguished in combination with other methods). One UE may perform transmission on multiple minimum scheduling units, and the number of first minimum scheduling units at the starting position is determined as the set transmission resource.

(2) As the method of dividing into the minimum scheduling units, a predefined dividing method is used, or the method of dividing into the minimum scheduling units is calculated according to some of the parameters predefined / set by the upper layer and carried in the DCI. For example, the time-frequency resource size of the minimum scheduling unit is predefined as one subframe in the time domain and one PRB in the frequency domain. For example, within the contiguous frequency domain range, the size of the minimum scheduling unit in the frequency domain is set by the upper layer to three subcarriers, and the size of the minimum scheduling unit in the time domain is predefined to be one subframe. do.

2. Based on the codewords, if different UEs perform transmission on the same time-frequency resource by different codewords and the number of supported codewords is limited, the codewords are numbered in order and the code used by the UE The number of words is a transmission setup resource. Specifically, different codewords may be different spreading codes, different scrambling codes, different interleaved codes, different resource element mapping patterns, and the like.

3. Based on the pilot signal, the established transmission resource is determined according to a predefined order of demodulation reference signal (DMRS) (eg, different sequence and / or different DMRS location). The pilot signal used by the UE is used as a resource in the established transmission.

4. In addition, when the system supports setting up multiple group RNTIs, setting different group RNTIs for different UEs can be used as an approach for distinguishing UEs.

(II) The parameter content related to the transmission resource set for the UE is carried directly or indirectly in the group DCI, or the mapping relationship between the DCI field and the parameter related to the transmission resource set for the UE is predefined.

1.Map based on bitmap

Some scheduling fields corresponding to transmission resource settings are set in the group DCI according to all transmission resource settings in the first time-frequency resource region. Specifically, any one of the following manners or a combination thereof is included.

(1) Some scheduling fields having a mapping relationship with all the minimum scheduling units divided in item (I) are set in the group DCI, and the scheduling content for the UE performing the transmission on the corresponding minimum scheduling unit is the respective scheduling field. Is returned from

(2) When different UEs perform PUSCH transmissions by different codewords, each codeword corresponds to a scheduling field in one group DCI and carries scheduling content for the UE mapped to the corresponding codeword .

(3) If different UEs perform PUSCH transmission with different pilot signals (eg, different sequences of DMRSs, DMRSs at different time-frequency resource locations), then each pilot signal is a scheduling field in one group DCI. Corresponding to the UE, the UE carries scheduling content mapped to the corresponding pilot signal.

(4) Specifically, when the scheduling content is UL A / N feedback, all set transmission resources in item I (e.g., each pilot signal used by each codeword of each minimum scheduling unit) The A / N feedback result is conveyed by the bitmap.

2. RNTI based mapping

(1) When the system supports setting up multiple group RNTIs, the UE used to scramble the DCI and the group RNTI set for the group RNTI may be used to determine whether there is a relationship between the scheduling field in the DCI and the identifier of the UE. have.

(2) The system sets the group RNTI for the UE and also the number of UEs in the group. There is a mapping relationship between the number of UEs and one or more scheduling fields in the group DCI, and the UE selects a scheduling field used to obtain scheduling information from the group DCI according to the set number.

3. Mapping between scheduling fields and transmission resources set for the UE

(1) A plurality of scheduling fields having a mapping relationship with the part of the UE to be scheduled are set in the group DCI, and the scheduling content for the corresponding UE and the transmission resource setting of the UE are carried in each scheduling field.

(2) There is a mapping relationship between the scheduling field in the group DCI and some of the transmission resources set for the UE, and the scheduling content and the remaining set transmission resources without mapping relationship are carried in each scheduling field. For example, several scheduling fields are set in the group DCI for each minimum scheduling unit, and the scheduling content and codewords and pilot signals used by the portion of the UE to be scheduled are carried in each scheduling field.

VII. The base station may transmit only one of the ACK and the NACK state. For example, when the base station performs ACK / NACK feedback, the base station performs scheduling only for the ACK, and the UE does not receive the ACK message transmitted by the base station within the search space set by the base station during PUSCH transmission. The ongoing PUSCH transmission is considered to be in the NACK state. Conversely, if the base station performs scheduling only for the NACK and the UE does not receive the NACK message sent by the base station within the search space set by the base station during the PUSCH transmission, the ongoing PUSCH transmission is considered to be in the ACK state.

(I) The scheduling content is omitted in the group DCI, and only some fields used for determining the transmission resource set for the UE are carried. When the purpose of using the group DCI by the base station is to perform A / N feedback, when the base station performs scheduling only for the ACK, the UE receives the ACK after acquiring a field corresponding to the set transmission resource in the DCI. To be considered; If the base station performs scheduling only for the NACK, the UE is considered to receive the NACK after acquiring a field corresponding to the configured transmission resource in the DCI.

VIII. The UE decodes the group DCI by its group RNTI. If the DCI can be successfully decoded, the scheduling field position associated with the UE is determined according to the mapping relationship between the identifier field of the UE predefined and set by the upper layer and the scheduling field in the DCI, so as to decode the scheduling content for the UE. do.

IX. If the UE decodes the group DCI and obtains an ACK feedback result corresponding to the HARQ process from the group DCI, the subsequent operation of the UE is:

(I) when the ACK feedback result is used as the ETS, performing at least one of the following operations:

1. terminating the ongoing PUSCH transmission corresponding to the ACK information;

2. clearing the UL grant set by the base station;

3. releasing the remaining portion of the scheduled PUSCH transmission resources from the base station;

4. clearing the buffer of the HARQ process; And

5. Terminating monitoring of the physical downlink control channel (PDCCH).

Preferably, the UE may perform subsequent actions (eg, one or more of actions 1 to 5) in accordance with a priority order or action selection setting predefined / set by a higher layer within a predefined time window or at a predefined time point. Do this.

X. If the UE decodes a single DCI or group DCI and obtains a NACK feedback result from the single DCI or group DCI, the UE continues to perform an incomplete transmission; Once the primary PUSCH transmission / current retransmission is complete, the UE triggers a new PUSCH retransmission.

XI. In addition, the UE is set to end PDCCH monitoring in the group DCI. The UE may automatically terminate PDCCH monitoring after obtaining the ACK feedback result in all ongoing HARQ processes, or the group DCI may carry a field used to set whether to end PDCCH monitoring in each scheduling field.

XII. Before and / or after the base station transmits a single DCI or group DCI to the UE to carry the A / N feedback results, the monitoring of the UE is performed to determine whether the UE correctly receives the A / N feedback results. Stay within the time window. If the UE correctly receives the A / N feedback result, the base station can continue with subsequent scheduling or else:

(1) If the base station transmits an ACK and the UE does not receive the feedback result correctly, the base station is triggered to send the ACK back to the UE by a single / group DCI, or the base station next performs a group DCI to perform UL feedback. Return the real-time A / N feedback result again when generating a;

(II) If the base station transmits a NACK and the UE does not receive the feedback result correctly, the base station resends the NACK by a single DCI or directly schedules the UE for corresponding retransmission.

XIII. The contents of the group DCI include the following optional fields:

(1) a subframe index and a PRB index configured to determine the number of start and / or end subframes / (sub) PRBs in the first time-frequency resource region;

(II) the subframe length and PRB length set to determine the length of the first time-frequency resource region in both the time domain and the frequency domain;

(III) a time-domain granularity and frequency domain granularity set to determine the number of (sub) physical resource blocks of each minimum scheduling unit in the time domain / frequency domain when the first time-frequency resource region is divided into minimum scheduling units ; For example, when the time domain granularity is 1 and the frequency domain granularity is 1, if the frequency domain setting is the PRB level, the minimum scheduling unit is one PRB in the LTE system; If the frequency domain setting is at the sub-PRB level, the minimum scheduling unit is one sub-PRB in the LTE system; For example, when the values of time-domain granularity and frequency domain granularity are greater than 1, the minimum scheduling unit is several PRBs or sub-PRBs contiguous in the time domain and / or frequency domain in the LTE system;

(IV) the time-domain number and the frequency domain number set to determine the number of regions corresponding to the group DCI when the first time-frequency resource region is divided into several regions;

(V) Resource granularity (time domain or frequency domain) set to determine the type of pattern specifically used by the group DCI when multiple time domain and / or frequency domain splitting patterns are predefined for a particular uplink time-frequency resource. Split pattern;

(VI) a sub-PRB identifier configured to determine whether frequency domain indication information for the group DCI is specific to the PRB level or the sub-PRB level; And

(VII) Scheduling contents, e.g., scheduling contents 1, scheduling contents 2, wherein the scheduling functions of the scheduling fields are the same or different, and the type of the scheduling function or the length of the fields is added to each field when the scheduling functions are different. It needs to be represented as an enemy.

XIV. Group DCI is transmitted as downlink control signaling in the search space of the downlink control channel, where possible search spaces are currently defined Common Search Space (CSS) and UE-specific Search Space (USS) Or otherwise a new group CSS is defined and a group DCI is sent here.

(I) When a group DCI is transmitted in the USS, it is transmitted in the USS of all UEs related to scheduling information in the group DCI, and the same DCI fragment may be transmitted in different USS several times.

(II) When the currently defined CSS is used, some resource locations used to transmit the group DCI or used to transmit only the group DCI are preset in the CSS, and transmission of the group DCI is not supported at other locations.

(III) When additionally defined group CSS is used, a newly defined group DCI search space is introduced into the system. The search space is set for the set of UEs by the base station, and the UEs in the set are activated to listen to the group DCI search spaces according to preset conditions.

(IV) The UE continues to monitor all USS and CSS set up for it by the base station and distinguishes the group DCI from other DCIs by the type of search space / location of search space / RNTI used by the DCI. When there is a conflict between search spaces, it is supported to use the priority of search spaces predefined / set by higher layers.

In this step, PUSCH transmission or PDCCH monitoring is terminated early by feeding back the DCI by HARQ-ACK. Another method is to introduce a signal sequence that is specifically used for early termination in the system. The sequence of premature termination signals may use a Go-To-Sleep (GTS) signal in an MTC system that includes premature termination of PUSCH reception, and PDCCH monitoring for the UE additionally includes go sent by the GTS signal in a legacy system. In addition to the functionality of the -to-sleep indication, that is, the UE performs an early termination when receiving a GTS signal in a legacy system; The sequence is used as an early termination signal in the system, and the design of the sequence is the same as the design of the sequence of the GTS signal, i.e., the UE has an early termination signal or a go-to-sleep signal depending on the location of the resource where the sequence receives the sequence. Determined to include. Or an additionally defined set of sequences is used as the sequence of early termination signals.

The sequence of early termination signals is transmitted by a mechanism similar to DCI, and by the base station in the USS and / or CSS for the UE. USS and / or CSS is a new search space specifically used for this type of sequence, or USS or CSS set up for the UE as defined in the legacy system.

Example 1

UE1, UE2 and UE3 initiate uplink transmissions to the base station and listen to the PDCCH search space respectively set up for it by the base station.

The base station transmits two DCI fragments to UE1, one is a single DCI used to transmit an ACK feedback message for UE1, and the other is a NACK feedback regarding the time-frequency resource location used by UE1 for UL transmission. Group DCI used to send the message.

UE1 receives two DCI fragments during monitoring and considers the UL transmission to be successful according to the priority of a single DCI higher than the priority of the group DCI among the priorities set by the higher layers.

The base station transmits two DCI fragments to UE2, one is a single DCI used to transmit an UL grant scheduling message for UE2, and the other is a NACK regarding the time-frequency resource location used by UE2 for UL transmission. Group DCI used to send a feedback message.

UE2 receives two DCI fragments during monitoring and executes scheduling instructions carried in the UL grant according to the priority of UL grant scheduling higher than the priority of A / N feedback among predefined priorities.

The base station successfully receives uplink data from UE3 and does not send DCI for UE3 for feedback.

The timer starts after UE3 completes the UL transmission. After the timer expires, UE3 will consider the UL transmission to be successful and will not start retransmission unless it receives a single DCI or group DCI sent to UE3 by the base station.

Example 2

In the MTC ETS scenario, the base station 1 sends a single DCI of DCI format 6-0A / B to UE1 to carry an A / N feedback message.

When UE1 is in Coverage Enhancement (CE) mode A, the resource allocation field of legacy DCI format 6-0A has at least 11 and at most 176 unused values according to the configured maximum PUSCH bandwidth and system bandwidth. If the resource allocation field has M unused values in legacy DCI format 6-0A for UE1, UE1 may define any eight values as early termination of transmission of eight UL HARQ processes for UE1; Defining any of the values as early termination of transmission of all UL HARQ processes for UE1; Defining any of the values as early termination of PDCCH monitoring for UE1; Defining any eight values as early termination of eight UL HARQ processes and PDCCH monitoring for UE1; And defining any one of a value as an early termination of transmission of PDCCH monitoring for UE1 and transmission of all HARQ processes. In addition, any number of values may be defined as early termination of transmission of any number of HARQ processes.

Specifically, the maximum PUSCH transmission bandwidth for UE1 is 1.4 MHz, the system bandwidth is 1.4 MHz, the resource allocation field of DCI format 6-0A has 11 unused values, and the N-th value corresponds to HARQ corresponding to UE1 in order. Defined as early termination of process #N and PDCCH monitoring, where N is an integer from 1 to 8; A ninth value is defined as early termination of all HARQ processes corresponding to UE1; The tenth value is defined as an early termination of PDCCH monitoring corresponding to UE1; The eleventh value is defined as early termination of all HARQ processes and PDCCH monitoring corresponding to UE1.

When UE1 is in coverage enhancement (CE) mode B, 11 Modulation and Coding Scheme (MCS) indices are supported, and there are five unused values in the MCS field as shown in Table 2. The value is defined as an early termination of transmission of two UL HARQ processes for UE1, defining any two values; Defining any of the values as early termination of transmission of all UL HARQ processes for UE1; Defining any of the values as early termination of PDCCH monitoring for UE1; A method of defining any two values as early termination of two UL HARQ processes and PDCCH monitoring for UE1; And an early definition of transmission of PDCCH monitoring for UE1 and early termination of transmission of all HARQ processes. In addition, any number of values may be defined as early termination of transmission of any number of HARQ processes.

 [Table 2] PUSCH MCS mapping table of CE mode B

Specifically, as shown in Table 3, the MCS indexes 11 and 12 are defined as early termination of HARQ processes # 0 and # 1 corresponding to UE1 in sequence, and the MCS index 13 corresponds to all corresponding UE1. Defined as early termination of HARQ process, MCS index 14 is defined as early termination of PDCCH monitoring corresponding to UE1, and MCS index 15 is defined as early termination of all HARQ processes and PDCCH monitoring corresponding to UE1. .

[Table 3] PUSCH MCS mapping table of CE mode B used to represent MTC ETS

In the MTC ETS scenario, the base station 2 transmits a single DCI of DCI format 6-0A / B to UE2 to carry an A / N feedback message. As described above, the resource allocation field or the MCS field of DCI in CE mode A or mode B has at least five unused values. The value is a manner of defining any of the values as early termination of transmission of all UL HARQ processes for UE2; Defining any of the values as early termination of PDCCH monitoring for UE2; Defining any one of the values as an early termination of PDCCH monitoring for UE2 and transmission of all UL HARQ processes; Defining any of the values as an early termination of transmission of a specific UL HARQ process for UE2 and using a field of HARQ process number to indicate the number of specific HARQ processes; And defining a value as an early termination of transmission of a specific UL HARQ process and PDCCH monitoring for UE2 and using a field of the number of HARQ processes to indicate the number of specific HARQ processes.

In the MTC ETS scenario, the base station 3 transmits a single DCI of DCI format 6-0A / B to UE3 to carry an A / N feedback message, each having a random X− to correspond to an X HARQ process by bitmap. Change the meaning of the bit field. The A / N feedback result is represented by 0 and 1, X is 8 in CE mode A, 2 in CE mode B, and the specific position of the X-bit field is predefined by the UE. A single DCI can be distinguished from legacy DCI format 6-0A / B by different RNTIs.

Example 3

The UE supporting to carry the feedback message as the ETS by the group DCI must acquire the configuration information of the group DCI from the base station in advance. Configuration information of the group DCI may be obtained by an upper layer message. The configuration information may include at least one or more group RNTIs, and may additionally include the number of UEs corresponding to each group RNTI.

Referring to FIG. 2, the UE performs continuous or intermittent data transmission on PUSCH time-frequency resources set by the base station, maintains monitoring of the PDCCH set to the search space, and blind detection on possible listened DCI signals. And attempts to perform CRC decoding based on the set group RNTI. When more than one group RNTI is set, group RNTIs are tried one by one. In case of a Full Duplex-Frequency Division Duplex (FD-FDD) UE, if resource positions configured for PUSCH transmission and PDCCH monitoring overlap in the time domain, the UE simultaneously performs PUSCH transmission and PDCCH monitoring within the configured UL and DL resource regions. To; In the case of a half-duplex-frequency division duplex (HD-FDD) UE, when resource positions configured for PUSCH transmission and PDCCH monitoring overlap in the time domain, PUSCH transmission and PDCCH monitoring are simultaneously performed in the configured UL and DL resource regions. Is not supported in the overlapped region, so the UE selects one having a higher priority from the UL transmission and the DL monitoring according to the preset priority, for example always preferentially performing the PUSCH transmission; In the case of a Time Division Duplex (TDD) UE, since the DL resources and UL resources in various TDD settings do not overlap in the time domain, the UL PUSCH transmission resources and DL PDCCH monitoring resources set for the TDD UE by the base station overlap in the time domain. It doesn't work.

If the UE successfully decodes the DCI heard by the established group RNTI, the UE reads the A / N feedback information sent by the base station to the UE from the DCI. The UE may be any of the following: the contents of the message field carried in the DCI, the time-frequency resource location used to transmit the DCI, the group RNTI used to decode the DCI, any of the parameters and mapping relationships preset or set by the higher layer. The combination of may determine how to read the A / N information in the DCI.

For example, UE1 receives group DCI # 0 and successfully decodes it. UE1 indicates the PUSCH time indicated by group DCI # 0 by the parameters k1 = 10 and k2 = 7 preset according to the time domain resource position for group DCI # 0 having subframes [t1 = 10, t2 = 11]. Determine that the domain resource region is a subframe [t1-k1, t1-k2], that is, a subframe [0, 3]; UE1 indicates that the PUSCH frequency domain resource region indicated by group DCI # 0 is set to PRB [# b1 = by a mapping relationship preset according to the frequency domain resource position for group DCI # 0 which is PRB [# a1, # a2]. 0, # b2 = 1]; UE1 supports the frequency domain resource granularity supported on the PRB [# 0, # 1] according to the mapping relationship between the preset time domain PUSCH resource granularity and the preset frequency domain PUSCH resource location and the supported frequency domain PUSCH resource granularity. Determining one PRB, the PUSCH resource granularity (called one minimum scheduling unit) of the time-frequency resource region represented by group DCI # 0 is one subframe in the time domain and one RB in the frequency domain , Where there are a total of eight minimum scheduling units in the time-frequency resource region. UE1 is used for UE1 according to the location of PUSCH transmission resources used for UE1 in the time-frequency resource region of subframes [1, 2] and PRB # 1, and a predefined mapping order in which the time domain precedes the frequency domain. Determined that the PUSCH transmission resources are located in the sixth through seventh consecutive minimum scheduling units in the time-frequency resource region. Upon obtaining the A / N feedback message from group DCI # 0, UE1 reads the contents of the sixth through seventh bits in the bitmap with the 8-bit A / N field carried in group DCI # 0. UE1 performs transmission of UL HARQ process # 0 in subframe 1 and PRB # 1, performs transmission of UL HARQ process # 1 in subframe 2 and PRB # 1, and A / N carried in group DCI # 0. It is assumed that the sixth bit of the bitmap having the field is an A / N feedback result for HARQ process # 0, and the seventh bit is an A / N feedback result for HARQ process # 1.

For example, UE2 receives and successfully decodes group DCI # 1. Depending on the time domain resource location for group DCI # 1 with subframe t3 = 12 and the number of minimum scheduling unit partition types carried in group DCI # 1, UE2 has corresponding parameters in the predefined minimum scheduling unit partition type table. find k3 = 12 and k4 = 9, determine that the PUSCH time domain resource region represented by group DCI # 1 is a subframe [t3-k3, t3-k4], i.e., subframe [0, 3], and The PUSCH frequency domain resource region is a PRB [# b3 = 8, # b4 = 11], the PUSCH resource granularity (called one minimum scheduling unit) is one subframe in the time domain, two PRBs in the frequency domain, Here, a total of eight minimum scheduling units exist in the time-frequency resource region. UE2 has a location of the PUSCH transmission resource used for UE2 in the time-frequency resource region in subframes [1, 2] and PRB [# 8, # 9], and the predefined mapping order in which the time domain precedes the frequency domain. Accordingly, it is determined that the PUSCH transmission resources used for UE2 are located in the second to third consecutive minimum scheduling units in the time-frequency resource region. When obtaining an A / N feedback message from group DCI # 1, UE2 reads the contents of the second to third bits in the bitmap with the A / N field carried in group DCI # 1. UE2 performs transmission of UL HARQ process # 0 in subframes [1, 2] and PRB [# 8, # 9], and has a second bitmap with an 8-bit A / N field carried in group DCI # 0. And the third bit is an A / N feedback result for HARQ process # 0, and it is assumed that the decoded A / N feedback value should be the same. Otherwise, it is considered an error. For example, the UE regards DCI decoding as false detection, the processing scheme is equivalent to when no A / N feedback is received, and the default A / N state is used when no feedback is received.

For example, UE3 receives group DCI # 2 and successfully decodes it. UE3 determines that the PUSCH time domain resource region indicated by group DCI # 2 is a subframe [t5-k5 according to the parameter k5 = 7 preset according to the time domain resource position for group DCI # 2 where subframe t5 = 13. ], I.e., subframe [6]; UE3 determines that the PUSCH frequency domain resource region indicated by group DCI # 2 is PRB [# b1 = 0, # b2 = 1] by a mapping relationship preset according to the group RNTI used to decode group DCI # 2. Determines that; UE3 determines that, according to the sub-PRB identifier carried in group DCI # 2, the frequency domain parameter in group DCI # 2 is at a lower PRB level; UE3 has a PUSCH resource granularity PUSCH resource granularity (one minimum scheduling) in the time-frequency resource region represented by group DCI # 2 according to the frequency domain minimum scheduling unit split granularity carried in three subcarriers, group DCI # 2. Unit is one subframe in the time domain and three subcarriers in the frequency domain, where there are a total of eight minimum scheduling units in the time-frequency resource region. UE3 is a predefined mapping in which the location of the PUSCH transmission resources used for UE3 in the time-frequency resource region, which is the subcarrier [# 3, # 5] of subframe [6] and PRB # 0, and whose time domain precedes the frequency domain. In order, it is determined that the PUSCH transmission resources used for UE3 are located in the second minimum scheduling unit in the time-frequency resource region. Upon obtaining the A / N feedback message from group DCI # 2, UE3 reads the contents of the second bit from the bitmap with the 8-bit A / N field carried in group DCI # 2.

For example, UE4 performs PUSCH transmission in subframe 1 and PRB # 1, and the PUSCH transmission resources for UE4 overlap with some of the PUSCH transmission resources for UE1 and are distinguished by different DMRSs. Different groups RNTI are set in UE1 and UE4. UE4 receives group DCI # 0/1/2 that cannot be successfully decoded even by all group RNTIs set for UE4. Thus, UE4 assumes not to receive the A / N feedback message sent by the base station.

The UE determines the subsequent operation according to the A / N state after obtaining the A / N feedback information sent by the base station to the UE from the group DCI. When the UE obtains ACK feedback from the group DCI, the UE decodes the group DCI and ends transmission of the UL HARQ process corresponding to the ACK feedback in the next subframe, and releases the corresponding remaining PUSCH resources. In addition, the UE terminates PDCCH monitoring after all ongoing UL HARQ processes have been transmitted or ACK feedback has been obtained. If the UE obtains NACK feedback from the group DCI, the UE continues with an incomplete PUSCH transmission or the UE triggers a PUSCH retransmission by NACK.

According to an embodiment of the present invention, that is, the UE first determines a specific time-frequency resource region, and then, according to the relative position of the time-frequency resource position used for the PUSCH in the specific time-frequency resource region, scheduling information corresponding to DCI is obtained. It can be understood by those skilled in the art that the method of determining can be applied to a single DCI. The difference is that DCI carries only scheduling information for one UE. See the previous description for other details.

Example 4

Here's how:

{Frequency domain start PRB index, length / frequency domain end PRB index of PRB, frequency domain minimum scheduling unit partition granularity / number / pattern};

Or determining the frequency domain resource by any combination of parameters of frequency domain index, possibly the following set: {length of PRB, frequency domain minimum scheduling unit granularity, number of frequency domain minimum scheduling units, minimum scheduling unit partition pattern}. Supported.

In addition, using frequency domain resources at the PRB level and at the lower PRB level is supported. Frequency domain resources may be distinguished by lower PRB identifiers; Can be distinguished by RNTI, that is, a portion of a particular RNTI is only bound to the PRB level / sub-PRB level; Can be distinguished by frequency domain location, that is, a portion of a particular subband of the transmission bandwidth is bound only to the lower PRB level. Moreover, when lower PRB levels are used, only a limited number of lower PRB granularities may be supported, and frequency domain resources may also be distinguished by RNTI or frequency domain location. When the lower PRB level is used, it is supported to use all frequency domain parameters at the lower PRB level, and also to set some frequency domain parameters preset / configured by higher layer signaling in the lower PRB level and other frequency domain parameters at the PRB level. Use is supported.

Here's how:

{Time domain start subframe index (difference with DCI transmission subframe (transmission interval) may be used), length / time domain end subframe index of subframe, time domain minimum scheduling unit split granularity / number / pattern};

Or determine a time domain resource by any combination of parameters of a time domain index, possibly the following set: {length of subframe, time domain minimum scheduling unit granularity, time domain minimum scheduling unit granularity, minimum scheduling unit partition pattern} Is supported.

In the following manner: predefined / preconfigured and configured by upper layer signaling, explicitly or implicitly carried in the DCI, mapped according to the RNTI used by the group DCI, according to the time-frequency position of the DCI It is supported to set the time-frequency parameter that is mapped.

Any given RNTI used by the group DCI may correspond to a predefined frequency domain and / or time domain resource location, or any one of the given group RNTIs is specific to each bit of the A / N feedback field of the group DCI. May correspond to a mapping relationship between frequency domain locations.

Any given RNTI used by the group DCI may correspond to one UE or a set of multiple UEs, ie a given RNTI will be set for one or more specific UEs.

One or more group RNTIs are defined and may be preset or configured by higher layer signaling such that any one of the given group RNTIs maps to several consecutive or discontinuous frequency domain subchannels, each subchannel in sequence in the DCI Corresponds to each bit of the A / N feedback field of.

The parameter may be predefined or set by a higher layer.

Referring to FIG. 3, for example, the base station transmits a group DCI in subframes [t1, t2] for UL A / N feedback. According to the predefined mapping relationship, the time-frequency resource position corresponding to the group DCI is from subframe t1-k1 to subframe t1-k2 in the time domain and n * M PRB in the transmission bandwidth in the frequency domain. K1, k2, n and M are predefined values, where M is frequency domain minimum scheduling unit split granularity, time domain minimum scheduling unit split granularity is k or predefined as 1, frequency domain starting position is assigned to group DCI Is calculated according to the index of the group RNTI used. Or the values of k1, k2, n and M are carried directly in the DCI. Or k1 and k2 are predefined values, the time domain minimum scheduling unit split granularity is predefined as 1, the frequency domain start / end position and the frequency domain minimum scheduling unit split granularity are carried directly in the DCI, and the carrier scheme is It is to provide a number in a predefined minimum scheduling unit partition pattern table. t1 = t2 and k1 = k2 are supported.

Referring to FIG. 4, the base station transmits a group DCI for UL A / N feedback, where the group DCI includes a lower PRB identifier field, and a value of the field is 1, that is, it carries information at a lower PRB level. The frequency domain starting PRB index carried in the group DCI is 0, and the minimum scheduling unit partitioning pattern is K. According to the preset contents, the N PRB of the lowest frequency domain position in the transmission bandwidth only supports lower PRB resources having granularities of three subcarriers and six subcarriers, which means that the group RNTI has a particle size of 1/2/3 subcarriers. It is determined according to the group RNTI of the group DCI supporting lower PRB resources. Therefore, the K-th partitioning scheme in the minimum scheduling unit partition pattern table having lower PRB resources having granularity of three subcarriers is finally used.

Example 5

The base station transmits the group DCI in subframe n for UL A / N feedback. According to the predefined mapping relationship, the time-frequency resource position corresponding to the group DCI is from subframe n-k-3 to subframe n-k in the time domain and is the highest 4M PRB of the transmission bandwidth in the frequency domain. The time-frequency resource is divided into 16 minimum scheduling units according to a predefined time-domain and frequency domain minimum scheduling unit granularity. The resource size of each minimum scheduling unit is one subframe in the time domain and M consecutive PRBs in the frequency domain, as shown in FIG. As shown in FIG. 5, it is noted that the label with # in FIG. 5 is not the number of minimum scheduling units, but is used only to describe each minimum scheduling unit.

Scenario 1:

Referring to FIG. 6, the minimum scheduling units are numbered according to the order in which the frequency domain precedes the time domain, that is, number # 00 is minimum scheduling unit 0, number # 10 is minimum scheduling unit 1, and number # 23 is minimum Scheduling unit 15, and number # 33 is the minimum scheduling unit 16. When the base station transmits the A / N feedback of the HARQ process to the UE by the group DCI, the 16-bit bitmap of the group DCI corresponds to the A / N feedback of 16 minimum scheduling units.

For example, UE1 transmits HARQ process # 1 in minimum scheduling unit 1 (# 10), HARQ process # 0 in minimum scheduling unit 15 (# 23), and UE2 transmits minimum scheduling unit 4 (# 01). When transmitting HARQ process # 1, the value of the second bit of the bitmap is an A / N feedback result for HARQ process # 1 for UE1, and the value of the fifth bit of the bitmap is HARQ process # for UE2. A / N feedback result for 1, and the value of the 15th bit of the bitmap is an A / N feedback result for HARQ process # 0 for UE1. Specifically, NACK may be represented by "0" and ACK may be represented by "1" in the bitmap.

Scenario 2:

Referring to FIG. 7, in this scenario, the minimum scheduling units are again grouped, and the minimum scheduling units are divided into groups 0/1/2/3 in the manner described in the figure. UE1 / 2/3/4 perform PUSCH transmission in group 0/1/2/3, respectively. When the base station transmits the A / N feedback of the HARQ process to the UE by the group DCI, the 4-bit bitmap of the group DCI corresponds to the A / N feedback of four minimum scheduling units.

Or, in this scenario, no minimum scheduling unit group is used. When the base station transmits the A / N feedback of the HARQ process to the UE by the group DCI, the 16 bit bitmap of the group DCI corresponds to the A / N feedback of four UEs, and the feedback is a transmission start position for each UE. In the DCI field corresponding to the minimum scheduling unit. For example, feedback results for UE1, 2, 3, and 4 are carried in the first, fifth, ninth, and thirteenth bits in the bitmap, respectively.

Scenario 3:

Referring to FIG. 8, the minimum scheduling units are numbered according to the order in which the frequency domain precedes the time domain, that is, number # 00 is minimum scheduling unit 0, number # 10 is minimum scheduling unit 1, and number # 23 is minimum Scheduling unit 15, and number # 33 is the minimum scheduling unit 16. When the base station transmits the A / N feedback of the HARQ process to the UE by the group DCI, the 16-bit bitmap of the group DCI corresponds to the A / N feedback of 16 minimum scheduling units.

For example, when UE1 transmits HARQ process # 1 at # 01/02/03, UE2 transmits HARQ process # 1 at # 30/31/32, and transmits HARQ process # 0 at # 33, The values of the fifth, ninth, and thirteenth bits of the bitmap are the A / N feedback results for HARQ process # 1 for UE1, and the values of the fourth, eighth, and twelfth bits in the bitmap are for UE2. A / N feedback result for HARQ process # 1, and the value of the 16th bit in the bitmap is an A / N feedback result for HARQ process # 0 for UE2. The base station assigns the same value to multiple bits of the bitmap corresponding to the same HARQ process for the same UE. If the UE gets a different value, this is considered false detection.

Scenario 4:

The minimum scheduling units are numbered according to the order in which the frequency domain precedes the time domain, that is, number # 00 is minimum scheduling unit 0, number # 10 is minimum scheduling unit 1, number # 23 is minimum scheduling unit 15, and # 33 is the minimum scheduling unit 16. One minimum scheduling unit is assumed to support at most two codewords distinguished by DMRS. When the base station transmits the A / N feedback of the HARQ process to the UE by the group DCI, the 32-bit bitmap of the group DCI corresponds to the A / N feedback of 16 minimum scheduling units as shown in Table 4.

[Table 4] One minimum scheduling unit supports two types of codewords

For example, if both UE1 and UE2 perform transmission in minimum scheduling unit 1 (# 10), and the DMRSs for UE1 and UE2 correspond to codeword 1 and codeword 2, respectively, the third bit in the bitmap Is the A / N feedback result for UE1, and the value of the fourth bit in the bitmap is the A / N feedback result for UE2.

Scenario 5:

The minimum scheduling units are numbered according to the order in which the frequency domain precedes the time domain, that is, number # 00 is minimum scheduling unit 0, number # 10 is minimum scheduling unit 1, number # 23 is minimum scheduling unit 15, and # 33 is the minimum scheduling unit 16. One minimum scheduling unit is assumed to support at most eight codewords distinguished by DMRS. When the base station transmits the A / N feedback of the HARQ process to the UE by the group DCI, the 16 scheduling fields of the group DCI correspond to the A / N feedback of 16 minimum scheduling units, each scheduling field being 1 bit A / N and 3-bit codeword number. The information bits of each scheduling field may be continuous or discontinuous, for example, the A / N for the 16 scheduling fields uses a 16 bit bitmap, and the codeword number for the 16 scheduling fields is continuous. Use 48 bits.

For example, when UE1 performs transmission at minimum scheduling up to 1 (# 10) and DMRS corresponds to codeword 011, the A / N value of the second scheduling field is an A / N feedback result for UE1, The codeword number field is 011. In this way, when there are multiple UEs performing transmissions in the same minimum scheduling unit, feedback for only one UE may be provided each time.

Scenario 6:

The minimum scheduling units are numbered according to the order in which the frequency domain precedes the time domain, that is, number # 00 is minimum scheduling unit 0, number # 10 is minimum scheduling unit 1, number # 23 is minimum scheduling unit 15, and # 33 is the minimum scheduling unit 16. One minimum scheduling unit is assumed to support at most eight codewords distinguished by DMRS.

When the base station transmits the A / N feedback of the HARQ process to the UE by the group DCI, the N scheduling fields of the group DCI correspond at most to the A / N information of the HARQ process for the N UEs, and each scheduling field is 4-bit minimum scheduling unit number and 3-bit codeword number.

When the UE fails to perform the transmission successfully, the base station will not provide A / N feedback to the UE; When the transmission of the UE is successfully received by the base station, the base station carries ACK feedback information for the UE in the transmitted group DCI. If the UE does not receive the A / N feedback message sent by the base station during the UL transmission, the UL transmission is considered unsuccessful.

For example, when UE1 performs transmission in minimum scheduling up to 1 (# 10), and DMRS corresponds to codeword 011, if the transmission of UE1 is successfully received when the base station transmits the group DCI, the minimum scheduling unit The number field 0001 and the codeword number field 011 are carried in any one of N scheduling fields. In this way, when there are multiple UEs performing transmissions in the same minimum scheduling unit, feedback for multiple UEs may be provided each time.

Scenario 7:

The minimum scheduling units are numbered according to the order in which the frequency domain precedes the time domain, that is, number # 00 is minimum scheduling unit 0, number # 10 is minimum scheduling unit 1, number # 23 is minimum scheduling unit 15, and # 33 is the minimum scheduling unit 16. It is assumed that multiple UEs are supported to perform transmissions at the minimum scheduling unit simultaneously, and that multiple UEs have different RNTIs.

When the base station transmits the A / N feedback of the HARQ process to the UE by the group DCI, the UE decodes the DCI by its RNTI, and the corresponding DCI field is transmitted to the RNTI only when the DCI can be decoded. / N is considered to carry feedback.

For example, when UE1 and UE2 both perform transmission in minimum scheduling unit 0 (# 00), if UE1 successfully decodes DCI by RNTI, the value of the first bit of the 16-bit bitmap in DCI is UE1. Is considered an A / N feedback result for; If UE2 does not successfully decode DCI by the RNTI, it is considered that there is no A / N feedback result for UE2 in DCI. In this way, when there are multiple UEs performing transmissions in the same minimum scheduling unit, feedback for only one UE may be provided each time.

Scenario 8:

The base station sets one number when setting up the group RNTI for the UE, and the UE obtains scheduling content for the UE itself from the Nth scheduling field of the DCI which can be decoded by the group RNTI according to the number N.

Example 6

In the MTC scenario, the group DCI carries A / N feedback as ETS as shown in FIG. 9.

The base station generates a fragment of the group DCI in subframe n-k2 + 1 and transmits the group DCI in subframe [n, n + m1]. The ACK message sent to UE1 and UE2 is carried in group DCI.

UE1 receives the group DCI sent by the base station and decodes the ACK message sent to UE1 itself. PUSCH transmission is terminated in subframe n + m1 + 1, the remaining portion of the PUSCH resource scheduled for UE1 is released, and PDCCH monitoring is terminated.

UE2 receives the group DCI sent by the base station and incorrectly decodes the NACK message sent to UE2 itself. PDCCH monitoring continues, PUSCH transmission continues, or PUSCH retransmission is triggered by NACK.

The base station maintains monitoring of all UEs scheduled by the group DCI within the time window subframe [n-k2 + 1, n + m2] (m2> m1 + 1). After subframe n + m1 + 1, the PUSCH transmission by UE1 will not be received in the time-frequency resources scheduled for UE1, so that UE1 correctly receives the group DCI and the remaining resources scheduled for UE1 are UL transmissions. Is considered to be rescheduled for another UE. After subframe n + m1 + 1, the PUSCH transmission by UE2 is still received in the time-frequency resources scheduled for UE2, so UE2 is considered to receive the group DCI incorrectly. The base station sends a fragment of a single DCI carrying the ACK message to UE2; The base station carries an ACK message sent back to the UE2 in the group DCI since the UE2 still performs the PUSCH transmission in the time-frequency resource corresponding to the DCI the next time it generates the group DCI; Since UE2 does not perform PUSCH transmission on time-frequency resources corresponding to DCI or PUSCH transmission by UE-2 does not complete on time-frequency resources, the base station transmits to UE2 the next time it generates a group DCI. It will not return an ACK message sent or a NACK message sent to UE2.

UE3 starts a timer with a duration of t after completing the UL transmission and maintains monitoring of the PDCCH. If no feedback message sent by the base station is received after the timer expires, UE3 uses the default feedback state. If the default feedback state is ACK, UE3 completes the UL transmission. If the default feedback state is NACK, UE3 performs a limited number of UL retransmission attempts or a limited number of transmission UL retransmission requests.

Example 7

The group DCI is transmitted in the CSS currently defined in the MTC and is distinguished from other DCIs in the same search space by the RNTI.

Or, a special group CSS for group DCI is newly defined in MTC. If other DCIs used to schedule multiple UEs are subsequently supported in the group CSS, DCIs with different purposes are distinguished by RNTI.

Or, the group DCI is transmitted in the USS defined in the current MTC. Specifically, for a given piece of group DCI, the group DCI is transmitted in USS of all or part of the UE associated with the DCI; In addition, when the group DCI transmitted in the subframe [n1, n2] indicates A / N feedback for the UE transmitting the PUSCH in the subframe [n1-k1, n1-k2], the USS setting range for the specific UE is does not include [n1, n2] or any subframe n, and when n1 <= n <= n2, the A / N feedback for the UE should be fed back to another DCI fragment according to the transmission timing; If the DCI does not have the proper n and k to match the transmission timing, feedback may be performed by a manner that represents a single UE / HARQ process in one DCI fragment, or A / N feedback for the UE is canceled.

Here, the method of newly defining a special group CSS for the group DCI in the MTC is specifically,

Introducing a newly defined search space set up to listen to the group DCI by the UE. The newly defined search space is set in the set of UEs by the base station. For all UEs in the set, the configuration information of the newly defined search space for the used group DCI is the same. There can be one or more UEs in the set. When there is one UE in the set, the search space is USS; When there are multiple UEs in a set, the search space is the CSS for the set of UEs.

When the UE obtains configuration information of the search space from the base station, the UE additionally obtains configuration information of the search space newly defined by higher layer signaling or broadcast message. The time domain location for the newly defined search space is the time domain location for other UE-specific Search Space (USS) and / or Common Search Space (CSS) set for the UE by the base station. Or different from; There is a complete or partial overlap between time domain locations.

The method of setting up time domain resources for a newly defined search space uses a legacy mechanism that modifies the method of calculating the starting subframe as follows: The starting subframe is k '= k + αT, where k is the MTC. Starting subframe of the search space calculated according to the legacy mechanism of (in MCC, the legacy mechanism is k = kb, where kb is the first downlink low coverage / coverage enhancement subframe starting continuously in subframe k0, k0 And b is a preset parameter or a parameter set by a higher layer), T is a cycle of search space, and α is a base station setting parameter additionally provided to the system.

In a scenario where the time domain location for the newly defined search space is different from the time domain location for the other search space for the UE, the frequency domain location for the newly defined search space is different from the frequency domain location for the other search space for the UE. Same or different. In such a scenario, when the same starting subframe parameter k is set in the legacy search space for the UE and the newly defined search space, αT is greater than or equal to the time domain length of the other legacy search space for the UE. Referring to Example 1 of FIG. 10 and Example 2 of FIG. 11, in Example 1, the legacy search space for the UE and the newly defined search space use different frequency domain resources, and αT is the value of another legacy search space for the UE. Greater than the time domain length; In Example 2, the legacy search space for the UE and the newly defined search space use the same frequency domain resource, and αT is equal to the time domain length of the other legacy search space for the UE.

In a scenario where there is an overlap between the time domain location for the newly defined search space and the time domain location for the other search space for the UE, the frequency domain location for the newly defined search space is determined for the other search space for the UE. Same as the frequency domain location. In such a scenario, when the same starting subframe parameter k is set for the legacy search space and the newly defined search space for the UE, αT is greater than or equal to zero and is smaller than the time domain length of other legacy search spaces for the UE. Referring to Example 3 of FIG. 12 and Example 4 of FIG. 13, in Example 3, αT is less than the time domain length of another legacy search space for the UE, and the newly defined time domain resource and the legacy domain of the legacy search space for the UE. The search spaces partially overlap, which uses the same frequency domain resources; In Example 4, αT is equal to 0, and the time domain and frequency domain resources in the legacy search space and the newly defined search space for the UE completely overlap.

Or, in a scenario where there is an overlap between the time domain location for the newly defined search space and the time domain location for another search space for the UE, the frequency domain location for the newly defined search space is determined for the UE in the frequency domain. Adjacent to the frequency domain location for other search spaces.

In addition, in a scenario where the time domain location for the newly defined search space is different from the time domain location for the other search space for the UE, another method of calculating the starting subframe of the newly defined search space is used: FIG. 14. Referring to, the starting subframe is k '= k1 + αT, where k1 is the first subframe or the first downlink valid subframe after completion of the legacy search space for the UE, T is a cycle of the search space, and α Is a base station configuration parameter additionally provided to the system, and α is greater than or equal to zero.

When the newly defined search space is set as CSS for a set of UEs including a plurality of UEs, reference is made to the search space resource allocation example provided in FIG. 15, where the newly defined CSS is set in the frequency domain resource #M, The starting subframe is k '= k + αT; The legacy search space for UE1 is set in frequency domain resource #M, the starting subframe is k, the time domain resource for newly defined CSS and the legacy search space for UE1 are different, and their frequency domain resources are the same. ; The legacy search space for UE2 is set to frequency domain resource #N, the starting subframe is k, and the time domain and frequency domain resources for newly defined CSS and the legacy search space for UE2 are different.

In the newly defined search space introduced to the system, the downlink control information (DCI) transmitted by the base station includes the group DCI shared by the set of UEs for which the newly defined search space is set, and the UE in the set of UEs. May include a specific DCI. The length of the group DCI in the search space is equal to the length of the DCI in the legacy USS and / or CSS of the system, or the length of the DCI is less than the length of the DCI in the legacy USS and / or CSS.

The UE maintains monitoring of all USS and CSS set by the base station and determines whether the received DCI is a type of search space and / or a location of the DCI in the search space and / or a group DCI by the RNTI used by the DCI. In addition, a scheduling function specifically carried by the received DCI, for example, A / N feedback may be determined.

Here, in the method of newly defining a group CSS special to the group DCI in the MTC, the step of monitoring the newly defined search space set by the base station by the UE is the step of obtaining the configuration information of the newly defined search space from the base station And starting the monitoring of the search space when the conditions for activating the monitoring are met. The conditions for activating the monitoring include any combination of the following: the UE performs ongoing PUSCH transmission or ongoing PDCCH monitoring; In the scheduling information obtained from the base station, the number of repetitions of ongoing PUSCH transmissions by the UE exceeds the threshold K1; The number of repetitions of ongoing PUSCH transmissions by the transmitted UE exceeds the threshold K2. For example, when K1 = 0 and K2 = 0, the UE always listens to the newly defined search space, ie the monitoring covers the resource location of each cycle of the search space.

When there is a conflict between the established search spaces (CSS, group CSS and USS), the UE determines the type of search space currently listening in the order of predefined / set priority by the upper layer or by all possible RNTIs. Perform blind decoding on the DCI received at the location. Here, the step of the UE determining the type of search space currently listening in the priority order predefined / set by the higher layer may be performed in the search space in which the UE is currently listening according to the predefined / set priority by the higher layer. Determining a resource location for the. When there is a conflict between resource locations set for the search space, the UE cannot listen to the resource locations for all search spaces at the same time.

When there is a collision between the established search space and another channel (eg PDSCH), the UE listens or transmits a higher priority channel or search space according to the priority of the search space and other channels obtained from the base station. In this case, abandonment of monitoring or transmission of low priority channels or search spaces. For example, the priority of the PDSCH set for the UE by the base station is higher than the priority of the newly defined search space. On the other hand, when it is necessary to receive the PDSCH and listen to the newly defined search space at the same time, the UE gives up monitoring of the search space and selects to receive the PDSCH.

이라는 조건을 만족하며, 여기서

는 프레임 수 k0이고,

는 서브프레임 수 k0이고,

및 b는 미리 설정된 파라미터 또는 상위 계층에 설정된 파라미터임), T는 검색 공간의 사이클(상위 계층에 의해 설정된 파라미터 Rmax와 G를 곱함으로써 획득됨)이고, α는 부가적으로 시스템에 제공되는 기지국 설정 파라미터이다.The method in this embodiment can be used in NB-IoT. The method of calculating the starting subframe will be described below. Similarly, the starting subframe is k '= k + αT, where k is the starting subframe of the search space calculated according to the NB-IoT's legacy mechanism (in NB-IoT, the legacy mechanism is k = kb and kb is Bb NB-IoT downlink subframes starting consecutively in subframe k0, where k0 is

Satisfying the condition

Is the number of frames k0,

Is the number of subframes k0,

And b is a preset parameter or a parameter set in a higher layer), T is a cycle of the search space (obtained by multiplying the parameter Rmax set by the higher layer and G), and α is additionally provided to the base station setting provided to the system Parameter.

Example 8

In a typical scenario such as grant-free uplink transmission, the base station sets up contiguous UL time-frequency resources for multiple UEs to perform contention-based UL transmission. In a grant-free scenario, different users may perform transmissions on the same time-frequency resource using different codewords, pilot signals, and multiple access (MA) signatures.

In a particular example, the base stations put multiple UEs into groups. In the group, UE1, UE2 and UE3 specifically select time-frequency resources for transmitting multiple HARQ processes by themselves, as shown in FIG.

Referring to FIG. 16, UE1 / 2/3 starts timer 1 for A / N feedback when completing transmission of HARQ process 1, and continues to transmit HARQ process 2. The base station transmits a group DCI carrying A / N information to a group of UEs before expiration of timer 1, and UE1 / 2/3 each transmits HARQ transmitted by the base station with three corresponding bits in the bitmap for the A / N. 1 Get feedback.

UE1 / 2/3 starts timer 2 for A / N feedback after completing transmission of HARQ process 2 and determines a subsequent operation according to the feedback result for HARQ1. UE1 receives ACK feedback and stops subsequent transmissions; UE2 receives ACK feedback and transmits new data in subsequent resources by HARQ1; UE3 receives the NACK feedback and performs retransmission on subsequent resources by HARQ1. Meanwhile, the base station transmits a group DCI carrying A / N information to a group of UEs before expiration of timer 2, and UE1 / 2/3 are transmitted by the base station with three corresponding bits in the bitmap for A / N, respectively. HARQ 2 feedback is obtained.

In such a scenario, there may be another UE performing transmission on the same resource as UE1 / 2/3. For example, the base station may set different group RNTIs and the same continuous time-frequency resources for UE4 and UE1. When UE4 selects the same resource as UE1 in the continuous time-frequency resource, the feedback for UE-4 may be distinguished from UE1 by the group RNTI. For example, the base station can set up the same group RNTI and the same continuous time-frequency resources for UE5 and UE1. When UE5 selects the same resource as UE1 in consecutive time-frequency resources, UE5 and UE1 use different codewords, or different reference signals, such as different DMRS sequences or different DMRS time-frequency resource locations, or different MA signatures. In this case, the base station can distinguish transmission of UE5 from UE1, and the feedback from the base station for UE5 can be distinguished from the feedback for UE1 by directly or indirectly carrying a corresponding codeword / reference signal / MA signature in DCI. .

Referring to FIG. 17, in a typical scenario such as Semi-Persistent Scheduling (SPS), the base station regularly allocates consecutive resources to one UE for UL transmission. In a particular example, the base station performs SPS on UE1, UE2, and UE3, which is described in detail in the figures below. In the figure, the start position of the SPS cycle for UE1 / 2/3 and / or the transmit start position within each SPS cycle are not aligned. Therefore, there is no fixed feedback point. The base station needs to perform A / N feedback individually or together depending on the real time reception state for UE1 / 2/3.

As shown in FIG. 17, UE1 / 2/3 starts timer UE1 / 3/3 for A / N feedback when completing the SPS transmission within a cycle and resumes SPS transmission within the next cycle. The base station transmits a group DCI carrying A / N information to UE1 / 2/3 at time t1, and UE1 / 2/3 each transmits an SPS transmitted by the base station with three corresponding bits in the bitmap for the A / N. Obtain feedback. SPS feedback is considered as feedback content for transmission in the last SPS cycle.

In such a scenario, there may be other UEs performing transmission on the same resource as UE1 / 2/3, and similarly, the UEs may be distinguished by a code division mode such as DMRS or group RNTI.

Referring to FIG. 18, a user device used to receive scheduling information according to an embodiment of the present invention may include:

A downlink control information obtaining module, configured to obtain downlink control information (DCI); And

And a scheduling information determination module configured to determine scheduling information corresponding to the PUSCH in the DCI according to a mapping relationship between the configured transmission resource used for the physical uplink shared channel (PUSCH) and the scheduling information in the DCI.

The operations of the downlink control information obtaining module and the scheduling information determining module correspond to steps 101 and 102 in the method of receiving scheduling information, respectively, according to an embodiment of the present invention, which will not be described herein.

Compared with the prior art, it can be seen from the detailed description of the embodiments of the present invention that the embodiments of the present invention have at least the following advantageous technical effects.

1. The scheduling information in DCI is determined by the mapping relationship between the configured transmission resource used for transmitting the PUSCH by the UE and the scheduling information in the DCI, so that the base station transmits only one DCI fragment to the PUSCH configured transmission resource and the DCI. It is possible to schedule all UEs that have a mapping relationship between scheduling information in. Scheduling overhead is reduced, resource waste is reduced, and the efficiency of the scheduling terminal by the communication system is significantly improved.

2. The base station schedules the UEs by two types of DCIs: DCI, in which a piece of DCI carries scheduling information for one UE, and DCI, in which a piece of DCI carries scheduling information for multiple UEs. Thus, the technical solution of the embodiment of the present invention is very flexible and compatible.

3. The relationship between the time-frequency resource location used to transmit the PUSCH by the UE and a specific time-frequency resource region is mapped to the DCI to determine scheduling information in the DCI, and the time- used to determine the scheduling information. The frequency resource region is determined directly by the time-frequency resource location for the received DCI. The extra signaling overhead of transmitting the time-frequency resource region is reduced, and the transmission efficiency is improved.

4. The particular time-frequency resource region is divided and mapped to a scheduling field in DCI. One split unit may correspond to multiple UEs, or one UE may correspond to multiple split units. It is very flexible and extensible.

5. After the scheduling information is obtained, the corresponding operation may be executed within a preset time window or at a preset time point according to ACK / NACK. This is very flexible.

6. This is applicable to typical scenarios such as grant-free and SPS. In this scenario, the base station sets up the same resource pool for multiple UEs, and the UE selects transmission resources in a competitive manner. The scheduling scheme according to an embodiment of the present invention is more efficient and reliable in this scenario.

Next generation machine type communication systems provide more requirements for improved coverage. In the next eMTC Release 15 standardization project, the introduction of scheduling of partial PRBs supporting PUSCH is proposed, i.e., PUSCH needs to be transmitted only on several subcarriers in one PRB, thus improving uplink (UL) transmission power spectral density. Further increase improves coverage ability.

Embodiments of the present invention are directed to eMTC technology and aim to further improve the coverage capability of eMTC and support subcarrier level scheduling. The present invention relates to the design of downlink control information (DCI) and the design of a user operational flow.

19 is a schematic flowchart of a data transmission method according to an embodiment of the present invention.

Step 301: The terminal determines whether the base station supports the first scheduling mode according to the setting information of the first scheduling mode sent by the base station.

Here, the first scheduling mode and the second scheduling mode use different frequency domain scheduling granularity, and the frequency domain scheduling granularity used by the first scheduling mode is smaller than the frequency domain scheduling granularity used by the second scheduling mode.

Here, the frequency domain scheduling granularity used by the first scheduling mode is subcarrier level scheduling.

Step 302: If the base station supports the first scheduling mode, the terminal sends a request message and / or a capability message to the base station.

Here, the request message is used to request the base station to set the first scheduling mode, and the capability message is used to report the scheduling mode supported by the terminal.

Step 303: The terminal receives the scheduling information under the first scheduling mode sent by the base station, and transmits and receives data according to the scheduling information under the first scheduling mode.

20 is a schematic flowchart of a data transmission method according to another embodiment of the present invention.

Step 401: When the base station supports the first scheduling mode, the base station broadcasts a configuration message of the first scheduling mode.

Here, the first scheduling mode and the second scheduling mode use different frequency domain scheduling granularity, and the frequency domain scheduling granularity used by the first scheduling mode is smaller than the frequency domain scheduling granularity used by the second scheduling mode.

Here, the frequency domain scheduling granularity used by the first scheduling mode is subcarrier level scheduling.

Step 402: The base station receives a request message and / or a capability message sent by the terminal.

Here, the request message is used to request the base station to set the first scheduling mode for the terminal, and the capability message is used to report the scheduling mode supported by the terminal.

Step 403: If the scheduling mode of the terminal is the first scheduling mode, the base station transmits scheduling information to the terminal under the first scheduling mode, so that the terminal transmits and receives data according to the scheduling information under the first scheduling mode.

21 is an interactive flowchart of data transmission between a terminal and a base station according to an embodiment of the present invention.

Step 501: when the base station supports the first scheduling mode, the base station broadcasts a configuration message of the first scheduling mode; Step 502: the terminal determines whether the base station supports the first scheduling mode according to the setting information of the first scheduling mode sent by the base station; Step 503: If the base station supports the first scheduling mode, the terminal sends a request message and / or a capability message to the base station, where the request message is used to request the base station to set the first scheduling mode for the terminal. The capability message is used to report the scheduling mode supported by the terminal; Step 504: The base station receives a request message and / or a capability message sent by the terminal, where the request message is used to request the base station to set a first scheduling mode for the terminal, and the capability message is sent to the terminal. Used to report scheduling modes supported by; Step 505: when the terminal scheduling mode is the first scheduling mode, the base station transmits scheduling information to the terminal under the first scheduling mode, so that the terminal transmits and receives data according to the scheduling information under the first scheduling mode; In step 506, the terminal receives the scheduling information under the first scheduling mode sent by the base station and transmits and receives data according to the scheduling information under the first scheduling mode.

Here, the frequency domain scheduling granularity used by the first scheduling mode is subcarrier level scheduling.

Moreover, the scheduling mode includes a coverage enhancement mode (CE mode).

Furthermore, the setting information of the first scheduling mode is

An indication message for which the base station supports the first scheduling mode; And / or a physical random access channel (PRACH) coverage enhancement level (CE level) establishment message corresponding to the first scheduling mode;

Here, the PRACH CE level setting message corresponding to the first scheduling mode,

Reference Signal Receiving Power (RSRP) corresponding to PRACH transmit repetition count, preamble index, PRACH frequency modulation offset, Machine Type Communication Physical Downlink Control Channel (MPDCCH) search space offset, and PRACH CE level At least one of the threshold values.

Furthermore, prior to step 505, the method may schedule by using the first scheduling mode after receiving an acknowledgment (ACk) message sent by the terminal used to notify the terminal. ; The terminal receives the scheduling mode setting information sent by the base station and determines the scheduling mode to be subsequently used according to the scheduling mode setting information.

Moreover, step 506 allows the terminal to monitor downlink control information (DCI) under a first scheduling mode transmitted by a base station, where the DCI includes a DCI in a first format and a DCI in a second format; Where the DCI in the first format is used to carry UL grant information and the DCI in the second format is used to carry DL grant information; The terminal performs UL transmission according to the DCI in the first format and / or the terminal performs DL reception according to the DCI in the second format.

Furthermore, in step 503, the terminal sending a setup request message and / or capability message to the base station includes: the terminal determining a PRACH CE level; If the scheduling mode corresponding to the PRACH CE level is the first scheduling mode, the terminal returns a setup request message and / or a capability message in a random access request message sent to the base station; If the scheduling mode corresponding to the PRACH CE level includes at least two scheduling modes, the connection establishment request message sent to the base station carries a setup request message and / or a capability message.

Here, the at least two scheduling modes include a first scheduling mode.

Specifically, the terminal determines the PRACH CE level. If the scheduling mode corresponding to the PRACH CE level is the first scheduling mode, returning the setup request message and / or capability message to the random access request message sent to the base station includes the following: Determine the PRACH CE levels of the first scheduling mode and the second scheduling mode in at least two scheduling modes, and receive and read the contents of the random access response (RAR) message according to the second CE mode, wherein the second CE At least one PRACH CE level of the mode is the same as the PRACH CE level of the first CE mode; The terminal sends a connection establishment request message to the base station and returns a setup request message and / or a capability message to the random access request message sent to the base station.

Specifically, the terminal determines the PRACH CE level. If the scheduling mode corresponding to the PRACH CE level includes at least two scheduling modes, carrying the setup request message and / or capability message in the random access request message sent to the base station includes:

The terminal determines the PRACH CE level of the first scheduling mode according to the DL measurement result, transmits a random access request message to the base station according to the configuration information of the PRACH CE level, and the setup request message and / or capability message in the random access request message. To return.

Moreover, in step 503, the step of the terminal sending a setup request message and / or capability message to the base station specifically includes: the terminal sends a connection setup request message to the base station and sends a random access request message to the base station. Return a setup request message and / or a capability message; When the terminal establishes a connection with the base station, the terminal sends a setup request message and / or capability message to the base station.

Moreover, the step of the terminal performing UL transmission according to the DCI of the first format includes obtaining a resource allocation from the DCI of the first format, and performing the UL transmission according to the resource allocation.

Where resource allocation,

Narrowband index indication; PRB index indications; Subcarrier index indications; At least one of the resource unit number indication.

Furthermore, if the resource allocation obtained from the DCI of the first format includes a subcarrier index indication and does not include a PRB index indication, the terminal selects a subcarrier and a PRB corresponding to a UL transmission scheduled according to the subcarrier index indication. Determine and / or; If the resource allocation obtained from the DCI of the first format includes a subcarrier index indication and does not include the resource unit number indication, the terminal indicates that the subcarrier index and resource unit corresponding to the UL transmission scheduled according to the subcarrier index indication. Determine the number

Furthermore, the terminal determines at least one of a narrowband index, a PRB index, a subcarrier index, and the number of resource units for UL transmission according to a predetermined value and / or radio resource control (RRC) signaling.

Moreover, the step of the terminal performing the UL transmission according to the resource allocation includes the following:

The terminal determines a transport block size (TBS) according to the number of resource units obtained from the subcarrier index and the resource allocation; Perform UL transmission based on TBS.

Furthermore, the terminal acquires Hybrid Automatic Repeat Request-Acknowledgment (HARQ-ACK) resource information from the DCI in the second format and performs ACK UL transmission according to the HARQ-ACK resource information; The terminal obtains HARQ ACK resource information from the DCI in the second format and performs Non-Acknowledgment (NACK) UL transmission according to the HARQ-ACK resource information.

Here, the HARQ-ACK resource information includes HARQ-ACK resource offset information; HARQ-ACK transmission repetition number indication information; HARQ-ACK scheduling delay indication information; At least one of the HARQ-ACK transmission subcarrier index indication.

An embodiment of the present invention provides a data transmission method. Compared with the prior art, in the embodiment of the present invention, the terminal determines whether the base station supports the first scheduling mode according to the setting information of the first scheduling mode transmitted by the base station, and when the base station supports the first scheduling mode The terminal sends a request message and / or a capability message to the base station to request the base station to set a first scheduling mode for the terminal or to report one or more scheduling modes supported by the terminal. When the base station receives a request message and / or a capability message sent by the terminal and determines that the terminal scheduling mode is the first scheduling mode, the base station transmits scheduling information to the terminal under the first scheduling mode, and the terminal schedules the first scheduling. In the mode, data is transmitted and received according to the scheduling information. That is, in the present invention, compared with the prior art, the new scheduling mode is the first scheduling mode. When both the terminal and the base station support the first scheduling mode, the base station may transmit the scheduling information to the terminal under the first scheduling mode. Accordingly, the terminal and the base station can transmit and receive data in the new scheduling mode.

Specifically, the scheduling mode may include a CE mode, the second scheduling mode may be a scheduling mode supported by the prior art corresponding to the present application, for example, CE mode B and / or CE mode A, The new scheduling mode, that is, the first scheduling mode, shown in the embodiment of the present invention may be a user CE mode, for example, CE mode C, scheduled to support subcarrier level scheduling.

In order to achieve the object of the present application, the present application proposes a method for implementing an eMTC system supporting subcarrier level scheduling. This method includes the following steps 601 to 603 (not shown).

Step 601: The terminal reads the configuration information of the CE mode that supports subcarrier level scheduling of the system.

Step 602: After acquiring the configuration information of the CE mode supporting the subcarrier level scheduling of the system, the terminal reports the configuration request or capability.

Step 603: The terminal acquires a CE mode which is a CE mode supporting subcarrier level scheduling, monitors the DCI format of the CE mode, and performs UL and DL transmission.

Here, the manner in which the terminal acquires the CE mode includes receiving an ACK for the terminal to report a setup request or capability; The terminal receives the CE mode scheduling information of the base station.

Example 9

In order to achieve the object of the present application, the following describes a design scheme of DCI of an eMTC system supporting UL subcarrier level scheduling.

The user CE mode, which is different from the existing CE mode A and CE mode B scheduling granularities, is CE mode C. For users of CE mode A and / or CE mode B, setting CE mode C means that smaller scheduling granularity, for example subcarrier level scheduling, can be supported. Thus, CE mode C can be considered as an extended CE mode based on existing CE mode A and / or CE mode B. Note that the format of DCI of CE mode C is 6-0C. When a user of CE mode A and CE mode B can set up CE mode C, CE mode C can support two different DCI formats of UL grants, each of which allows for smaller scheduling granularity transmission of the user in CE mode A. It is used to support and to support the user's smaller scheduling granularity transmission in CE mode B.

In order to support subcarrier level scheduling of the PUSCH, the terminal needs to acquire the following scheduling information as shown in Table 5:

TABLE 5

In the embodiment of the present invention, since the bit width of the DCI is limited, all of the above information cannot be represented in the resource allocation information, a part of the information can be represented in the DCI, and the remaining messages that cannot be represented in the DCI are RRC signaling indications require semi-static indications or are implicitly indicated under certain system rules. Specific contents of the configuration information and signaling transmission modes are provided in Table 5 below, respectively. The scheduling parameter setting mode may be used for subcarrier level scheduling of a setting in which CE mode C supports CE mode A and / or CE mode B, and also in a CE mode that supports subcarrier level scheduling in which CE mode C is set independently. Can be used. On the other hand, a method for representing scheduling information described below to support subcarrier level scheduling of the connection establishment request message (which may be message 3) in the random access process may also be used for RAR.

1) narrowband index indication

The content and the number of bits can reuse the scheme indicated in the existing DCI format 6-0B. In addition to indicating in DCI, narrowband index indications may also be indicated via RRC signaling, or the system may use narrowband (implicit indication without bits) where the user's UL transmission in CE mode C is fixed To be placed.

2) PRB index indication

The content and the number of bits can be reused in the manner indicated in the existing DCI format 6-0B, or can be jointly represented in combination with subcarriers. For a particular mode, the following subcarrier index indication portion may be shown. Here, in addition to that indicated in DCI, the PRB index indication may also be indicated via RRC signaling, or the system may use a PRB (implicit indication that does not indicate a bit) in which the user's UL transmission in CE mode C is fixed To be placed.

3) subcarrier index indication

The content of the subcarrier index indication may include only the subcarrier index used by the PUSCH channel transmission, and the index of the PRB in which the subcarrier is located is set by the PRB index indication or predetermined in the indicated narrow band. More specifically, when the number of PRBs set through the PRB index indication may be one or more, the terminal determines whether to further read the subcarrier index indication field according to a specific rule. For example, only when the number of allocated PRBs is 1, the terminal reads the subcarrier index indication field and determines the position of the subcarrier assigned to the PUSCH for transmission on the allocated PRB according to the subcarrier index indication. Table 6 provides some examples of the contents of subcarrier index indications in this case.

Table 6 (a)

Table 6 (b)

Table 6 (c)

Table 6 (d)

Table 6 (e)

Tables 6 (a) and 6 (b) use 5 bits and 4 bits to indicate some states of single subcarrier scheduling, three subcarrier scheduling, and six subcarrier scheduling, respectively; Table 6 (c) uses three bits to indicate the status of three subcarrier scheduling, six subcarrier scheduling, and twelve subcarrier scheduling; Table 6 (d) uses 5 bits to indicate the various states of three subcarrier scheduling, six subcarrier scheduling and 12 subcarrier scheduling (single PRB) and two PRB scheduling; Table 6 (e) uses three bits to indicate the various states of three subcarrier scheduling, six subcarrier scheduling and 12 subcarrier scheduling, and two PRB scheduling. Compared with 3 (a), 3 (b) does not include a single subcarrier allocation case where the subcarriers are located at the edge of the PRB and performance is degraded.

In the case of the embodiment of the present invention, the subcarrier index and the PRB index assigned to the PUSCH transmission may also be jointly represented without additionally indicating the PRB index. For example, Table 7 shows an example of indication content in this case. This example uses six bits to jointly represent the different states of a single subcarrier scheduling, three subcarrier scheduling, six subcarrier scheduling, 12 subcarrier scheduling, and two PRB scheduling, where the location of the scheduled subcarriers is dependent on the indication. It can be located on any PRB in the narrowband. Here, Table 7 may also reserve only subcarrier index indication fields 0 to 35, and may serve to jointly indicate only a few states of single subcarrier scheduling, three subcarrier scheduling, six subcarrier scheduling, and 12 subcarrier scheduling. .

TABLE 7

In Table 6 and Table 7, the specific state included in each scheduling case of each example may be increased or decreased depending on the number of bits.

In the case of an embodiment of the present invention, in addition to that indicated in DCI, subcarrier index indications may also be indicated via RRC signaling.

4) Resource unit number indication and MCS indication

The terminal needs to obtain the resource unit number, the MCS and the bit number of the transport block, where the terminal can obtain the resource unit number and / or the bit number of the transport block obtained through the TBS index; The resource unit number may be obtained through DCI setting or TBS index.

Specifically, the manner of implementing the acquisition of the TBS and the number of resource units, preferably, the user acquires the TBS index by using a lookup table according to the MCS index indicated by the DCI, and applies to the number of bits of the TBS and the TBS index. It may be to obtain the number of resource units according. One example is shown in Table 8, where the 16 types of MCS are represented by 4 bits in DCI corresponding to 16 types of TBS, and the set number of resource units is between the MCS index and / or the transport block index and the number of resource units. Can be obtained according to the corresponding relationship.

TABLE 8

Preferably, the implementation method of obtaining a TBS, the user obtains the MCS index and the resource unit number index, respectively, by the lookup table to obtain the TBS index according to the MCS index, and the transport block according to the TBS index and the set number of resource units Where the MCS index can be explicitly indicated, for example, by reusing the current indication scheme of DCI format 6-0B; The manner of representing the resource number index may be explicitly expressed in the DCI, and the terminal may acquire the number of resource units set according to the number of resource units in a lookup table manner. For example, using 3 bits to represent the six types of configurable resource units {1, 2, 3, 4, 5, 6}, all CE mode A (when the user's bandwidth capacity is 1.4 MHz TBS supported by NW) is supported with the same coding efficiency by setting the number of resource units using 3 bits; By using two bits to represent the four types of configurable resource units {1,2,4,6}, the TBS supported by all CE mode A (when your bandwidth capacity is 1.4 MHz) is two bits. Maintain the granularity of the subcarrier level scheduling transmission duration which is supported with the same coding efficiency by setting the number of resource units using and equal to CE mode A; After using 1 bit to indicate that the number of resource units is 2, for example, using bit 0 to indicate that the number of resource units is 1, and using bit 1 to indicate that the number of resource units is 2, the TBS supported by all CE mode A is Can be supported with the same coding efficiency by setting the number of resource units using 1 bit; The terminal obtains the resource unit number setting according to the correspondence between the scheduled subcarrier number and the resource unit number. For example, a single subcarrier scheduling / 3 subcarrier scheduling / 6 subcarrier scheduling uses a resource unit number of 2 and The signal PRB scheduling / 2 PRB scheduling scenarios use a resource unit number that is both one.

In the embodiment of the present invention, the terminal acquires the TBS according to the subcarrier index indication and the resource unit number index indication. If DCI format 6-0C includes scheduling of two PRBs and / or a single PRB, the indication indicating that the number of resource units is greater than 1 is agreed as a valid indication (the number of resource units in two PRB scheduling is 1 ms. TBS may be obtained according to an indication scheme of DCI format 6-0B.

In an embodiment of the present invention, in addition to that indicated in DCI, the resource unit number index indication may be indicated through RRC signaling.

5) Repetition number indication / transmission subframe number indication

The terminal needs to obtain the PUSCH transmission repetition number setting; After obtaining the transmission subframe number setting, the terminal may obtain the repetition number according to the set transmission subframe number.

The manner of representing the repetition number may be that the terminal acquires the repetition number set according to the repetition number index and other configuration parameters, and the other configuration parameter includes at least one of the following information: maximum PUSCH repetition number, subcarrier number and resource unit number do. The maximum number of PUSCH repetitions may be set by a higher layer. For example, in the prior art, the upper layer configuration parameter in CE mode B is "pusch-maxNumRepetitionCEmodeB" and the upper layer configuration parameter in CE mode A is "pusch-maxNumRepetitionCEmodeA". CE mode C can use the configuration parameters of CE mode A and / or CE mode B or define its own high level parameters.

로서 설정될 수 있는 설정된 최대 PUSCH 반복 수에 따라 반복 수 세트를 획득할 수 있고, 부반송파 수 및/또는 자원 유닛 수에 따라 반복 수의 보정 계수(correction factor)

를 결정하고; 단말기에 의해 획득된 반복 수 인덱스는

로서 설정된 후, 단말기는 설정된 반복 수

를 획득하고, 바람직하게는 보정 계수

는 부반송파 수와 자원 유닛 수에 의해 공동으로 결정될 수 있으며,

를 계산하는 공식은

이며, 여기서,

는 자원 유닛 수이고,

는 예를 들어 3개의 부반송파에 대해 자원 유닛의 길이(단위로서 밀리 초(ms)를 사용함)이고, 자원 유닛의 길이는 4ms이고, 할당된 자원 유닛 수가 2일 때, 신호 전송 블록은 시간 도메인에서

를 차지하며, 이는 PRB 레벨 주파수 도메인 스케줄링 입도 송신이 시간 도메인에서 8배로 확장되는 것과 동일하며, 따라서,

이다. 표 9(a)는 부반송파 수와 자원 유닛 수의 조합에 의한 보정 계수의 몇 가지 전형적인 값을 보여준다. 바람직하게는, 보정 계수

의 값은 또한 부반송파 수에 의해 결정될 수 있으며, 여기서

를 계산하기 위한 공식은

일 수 있으며, 여기서

는 자원 유닛의 길이이다(단위로서 ms를 사용함). 표 9(b)는 부반송파 수에 따른 보정 계수의 여러 전형적인 값을 보여준다. 또는 구체적으로, 단말기가 반복 수 인덱스, 최대 PUSCH 반복 수, 부반송파 수 및 자원 유닛 수에 따라 반복 수를 획득하는 방식은 다음과 같을 수 있다: 최대 PUSCH 반복 수의 설정 파라미터를 획득한 후, 단말기는 부반송파 수 및/또는 자원 유닛 수에 따라 보정 계수

를 획득하고, 획득된 최대 반복 수를 보정하고, 보정 방법 및 보정 계수를 획득하는 방법은 표 9(a) 및 표 9(b)에 도시된 바와 같이 이전의 예와 동일하다. 보정된 최대 PUSCH 반복 수에 따라 반복 수 세트를 획득한 후, 단말기는 반복 수 인덱스에 따라 현재 PUSCH 송신 반복 수에 사용된 반복 수 세트의 요소를 획득한다.Preferably, the method of acquiring the repetition number by the terminal may be that the terminal acquires the repetition number according to the repetition number index, the maximum PUSCH repetition number, the subcarrier number, and / or the number of resource units. Specifically, the terminal

A repetition number set can be obtained according to the set maximum PUSCH repetition number, which can be set, and a correction factor of the repetition number according to the number of subcarriers and / or resource units

Determine; The repeat count index obtained by the terminal is

After being set as

Is obtained, and preferably a correction factor

May be jointly determined by the number of subcarriers and the number of resource units,

The formula to calculate

, Where

Is the number of resource units,

For example, when three subcarriers are the length of a resource unit (using milliseconds (ms) as a unit), the length of the resource unit is 4 ms, and the number of allocated resource units is 2, the signal transmission block is in the time domain.

, Which is equivalent to extending the PRB level frequency domain scheduling granularity transmission eight times in the time domain,

to be. Table 9 (a) shows some typical values of the correction coefficients by the combination of the number of subcarriers and the number of resource units. Preferably, the correction factor

The value of can also be determined by the number of subcarriers, where

The formula for calculating

, Where

Is the length of the resource unit (using ms as the unit). Table 9 (b) shows several typical values of the correction coefficients according to the number of subcarriers. Or specifically, the method of acquiring the repetition number according to the repetition number index, the maximum PUSCH repetition number, the subcarrier number, and the resource unit number may be as follows: After acquiring a configuration parameter of the maximum PUSCH repetition number, Correction factor depending on the number of subcarriers and / or resource units

Is obtained, the maximum number of repetitions obtained is corrected, and the correction method and the method of obtaining the correction coefficient are the same as in the previous example, as shown in Table 9 (a) and Table 9 (b). After acquiring the repetition number set according to the corrected maximum PUSCH repetition number, the terminal acquires an element of the repetition number set used for the current PUSCH transmission repetition number according to the repetition number index.

Table 9 (a)

Table 9 (b)

로서 설정될 수 있는 부반송파 수 및/또는 자원 유닛 수에 따라 반복 수 세트를 획득할 수 있고, 단말기에 의해 획득된 반복 수 인덱스는

로서 설정된 후, 단말기에 의해 획득되는 설정된 반복 수는

이다. 여기서, 바람직하게는, 반복 수 세트는 반복 수 세트와 부반송파 수 및 자원 유닛 수의 조합 사이의 상응 관계에 따라 획득될 수 있으며, 예를 들어, 부반송파 수가 3이고, 자원 유닛 수가 2일 때, 반복 수 세트는 {1, 4, 8, 16, 32, 64, 128, 256}이고; 부반송파 수가 3이고, 자원 유닛 수가 4일 때, 반복 수 세트는 {1, 2, 4, 8, 32, 64, 96, 128}이다. 또는, 바람직하게는, 반복 수 세트를 결정하는 방법은 부반송파 수와 반복 수 세트의 상응 관계에 따라 반복 수 세트가 획득될 수 있는 것일 수 있으며, 예를 들어, 부반송파 수가 3일 때, 반복 수 세트는 {1, 2, 4, 8, 32, 64, 96, 128}이고; 부반송파 수가 6일 때, 반복 수 세트는 {1, 4, 8, 16, 32, 64, 128, 256}이다.Preferably, the method for acquiring the repetition number by the terminal may be to acquire the repetition number according to the repetition number index, the subcarrier number, and / or the number of resource units. Specifically, the terminal

A repetition number set can be obtained according to the number of subcarriers and / or resource units that can be set as

After set as, the set number of iterations obtained by the terminal

to be. Here, preferably, the repetition number set can be obtained according to the correspondence between the repetition number set and the combination of the subcarrier number and the resource unit number, for example, when the subcarrier number is 3 and the resource unit number is 2, The number set is {1, 4, 8, 16, 32, 64, 128, 256}; When the number of subcarriers is 3 and the number of resource units is 4, the repetition number set is {1, 2, 4, 8, 32, 64, 96, 128}. Or, preferably, the method of determining the repetition number set may be one in which a repetition number set may be obtained according to a corresponding relationship between the subcarrier number and the repetition number set, for example, when the subcarrier number is 3, the repetition number set Is {1, 2, 4, 8, 32, 64, 96, 128}; When the number of subcarriers is 6, the repetition number set is {1, 4, 8, 16, 32, 64, 128, 256}.

The two indication methods described above may be combined with each other. For example, the terminal determines a method of obtaining a repetition number according to the value of the number of subcarriers and / or resource units. As shown in Table 10, when the number of subcarriers is 3, when the number of resource units is 1 or when the number of subcarriers is 6 and the number of resource units is {1, 2}, the terminal repeats the index of repetition, the maximum number of PUSCH repetitions, the number of subcarriers, and Obtain a repetition number according to the number of resource units; In other cases, the repetition number is obtained according to the repetition number index, the subcarrier number and the resource unit number, and the specific method is as described above.

TABLE 10

Another setting method for achieving the same purpose is as follows: the terminal obtains a PUSCH transmission subframe number indication, wherein the set transmission subframe number is not an integer or an integer of the number of subframes used for one PUSCH transmission. It may be a multiple.

The terminal may acquire the PUSCH transmission subframe number indication as follows: The terminal obtains the PUSCH transmission subframe number set according to the transmission subframe number index setting and the maximum PUSCH repetition number setting, wherein the transmission subframe is set here. The number of frames may be an integer or a non-integer multiple of the number of subframes used for one PUSCH transmission. The transmit subframe number index may share the same indication field of DCI with the repeat number index, that is, when the terminal's CE mode is CE mode C and / or the number of subcarriers allocated by the PUSCH resource acquired by the terminal is one Is less than the number of subcarriers of the PRB, and the indication obtained by the terminal through this indication field is a transmission subframe number indication; The indication obtained by the terminal through this indication field is a repetition number index. For the same reason, the maximum transmission subframe number indication may share the same RRC indication field as the maximum repeat number indication, or the maximum transmission subframe number indication refers to an independent RRC information unit for subcarrier level transmission. The maximum number of transmission subframe indications share the RRC indication field with the maximum number of repetitions indication, the terminal's CE mode is CE mode C, and / or the number of subcarriers allocated by the PUSCH resource acquired by the terminal is one PRB. When the number of subcarriers is smaller than, the indication obtained by the terminal through this RRC indication field is the maximum transmission subframe number indication; The indication obtained by the terminal through this indication field is the maximum number of repetitions.

로서 나타내는 하나 이상의 자원 유닛에 매핑될 수 있으며, 각각의 자원 유닛은 적어도

번 반복적으로 송신된다.The number of PUSCH transmission subframes obtained by the terminal may be an integer or a non-integer multiple of the number of subframes used for one PUSCH transmission. The process of the terminal performing physical resource mapping according to the transmission subframe number setting is illustrated below. PUSCH is

Can be mapped to one or more resource units represented as, each resource unit being at least

Is sent repeatedly.

는 단말기가 획득한 PUSCH 송신 서브프레임 수이고,

는 자원 유닛에 포함된 슬롯 수이며, [*]는 반올림 함수(rounding down function)를 나타낸다. PUSCH가

번 반복적으로 송신되는 물리적 자원 매핑 방식은 NB-IoT 단말기와 동일하거나, 현재 프로토콜에서 BL/CE UE의 매핑 방법과 동일하다. 그 후,

번 반복적으로 송신한 후, PUSCH의 제1 서브프레임은

한 번 반복적으로 송신되며, 여기서,here,

Is the number of PUSCH transmission subframes acquired by the terminal,

Is the number of slots included in the resource unit, and [*] represents a rounding down function. PUSCH

The physical resource mapping scheme that is repeatedly transmitted once is the same as the NB-IoT terminal or the same as the mapping method of the BL / CE UE in the current protocol. After that,

After transmitting repeatedly, the first subframe of the PUSCH

Is sent repeatedly once, where

번 반복적으로 송신한 후, 신호 시간 동안 PUSCH에 의해 송신되는 제1

서브프레임은 도 23의 PUSCH 자원 매핑 방법 1에 도시된 바와 같이 한 번 반복적으로 송신된다. PUSCH의

번의 반복된 송신은 사이클 반복을 사용하며, 즉, 신호 시간 동안 PUSCH에 의해 송신되는 각각의 서브프레임이 여러 번 연속하여 반복적으로 송신된 후, 다음 반복이 수행되고(NB-IoT NPUSCH 물리적 자원 매핑 방법), 상술한 두 PUSCH 자원 매핑 방법은 상이한 효과를 갖는다. 도 23은 두 자원 매핑 방법의 개략도를 도시한다.As shown in PUSCH resource mapping method 2 of FIG. 23; or,

The first transmission transmitted by the PUSCH during signal time after repeated transmissions

The subframe is repeatedly transmitted once as shown in the PUSCH resource mapping method 1 of FIG. 23. PUSCH

One repeated transmission uses cycle repetition, that is, after each successive repetitive transmission of each subframe transmitted by the PUSCH during signal time, the next iteration is performed (NB-IoT NPUSCH physical resource mapping method). ), The above two PUSCH resource mapping methods have different effects. 23 shows a schematic diagram of two resource mapping methods.

In the case of the embodiment of the present invention, if the bit width of DCI format 6-1C (for DL grant) is extended, the additional bits are HARQ-ACK other than HARQ-ACK resource offset including one or more pieces of configuration information in Table 11; Can be used to indicate resource configuration.

TABLE 11

Here, the specific indication content of the three pieces of configuration information may reuse the existing eMTC signaling content or the configuration information of the NB-IoT DCI format N1.

The following provides examples of some complete configuration message sets in DCI format 6-0C.

An example is provided in Table 12, where the control information format of format 6-0C is the maximum number of bits of UL grant information in CE mode B (system bandwidth is 20 MHz) for use in supporting user subcarrier level scheduling in CE mode B. , The fixed total number of bits). DCI represents the PRB index and the subcarrier index in a joint indication scheme, and the indication of the narrowband index needs to be informed quasi-statically through RRC signaling. In this example, the UL scheduling of the terminal in CE mode C may cover subcarrier level scheduling and simultaneously cover a single PRB scheduling and two PRB scheduling in CE mode B. In this case, CE mode C can be used as extended CE mode B under the new protocol version. When the base station and the terminal support CE mode C, the terminal does not need to be set to be in CE mode B. Meanwhile, since UL grant information of CE mode C, that is, DCI format 6-0C no longer indicates a narrowband index, the total number of bits no longer changes according to the LTE system bandwidth. DL grant information of CE mode C, that is, signaling content of DCI format 6-1C may reuse CE mode B, but the total number of bits needs to be supplemented according to the LTE system bandwidth as shown in Table 13.

TABLE 12

TABLE 13

Here, in the resource allocation setting of Table 12, a smaller number of bits may also be used to indicate the subcarrier index, for example, Table 6 (e). In this case, both the PRB index indication and the narrowband index indication may be semi-statically set through RRC signaling. In this case, if DCI format 6-1C can still use the exact same setup parameters as format 6-1B, the total number of bits in DCI format 6-0C is equal to the minimum number of bits in format 6-1C (the system bandwidth is At 3 MHz), when the system bandwidth is greater than 3 MHz, DCI format 6-0C needs to be bit-compensated such that the total number of bits of UL and DL grant information is the same.

For an embodiment of the present invention, another example of a DCI format 6-0C configuration message is provided below to support subcarrier level scheduling of a user in CE mode B. Except for resource allocation, the rest of the DCI can reuse Table 12. For an embodiment of the present invention, resource allocation setting information of this example is provided in Table 14 below. In this example, each subcarrier index and / or resource unit number in the UL grant information (DCI format 6-0C) is represented, and in CE mode C to indicate the HARQ-ACK resource in the DL grant information (DCI format 6-1C), respectively. An additional 3 or 4 bits are introduced for the indication, where the indication content can reuse the setting content in DCI format N1 of the NB-IoT and / or to indicate the number of repetitions of HARQ-ACK transmissions. .

Table 14 (a)

Table 14 (b)

For an embodiment of the present invention, another example of a DCI format 6-0C configuration message is provided below to support subcarrier level scheduling of a user in CE mode A. The CE mode C indication identifier (ID) is introduced to indicate that the current CE mode is CE mode A or CE mode C. The ID is used to parse other indication fields of DCI format 6-0C. Bit numbers and details of each indication field are shown in Table 15 below.

TABLE 15

In order to achieve the object of the present application, UL subcarrier level scheduling of a user in CE mode C is supported. The following describes a flow design scheme that supports users in CE mode C for DL reception and UL transmission in accordance with CE mode C. Multiple CE modes that support subcarrier level scheduling, for example, CE mode C (which may be extended CE mode B to support subcarrier level scheduling) and CE mode D (extended to support subcarrier level scheduling). When CE mode A) may be present in the system at the same time, the following description may be replaced with CE mode D to form the corresponding flow. Users working in different CE modes read different DL control channel formats.

Step 1: The terminal reads the setting information of CE mode C.

In the case of an embodiment of the present invention, the configuration message includes at least one of the following contents: 1) The system is for example in a Master Information Block (MIB) or a System Information Block (SIB). An indication message supporting CE mode C, which may be returned as a system message, wherein the indication message may be a 1-bit enable message, or the indication message may be a CE mode C by the cell indicating the protocol version. Implicitly indicates support for; 2) The NPRACH Coverage Enhancement Level corresponding to CE mode C includes, but is not limited to, the RSRP thresholds corresponding to the PRACH transmission repetition number, preamble index, PRACH frequency hopping offset, MPDCCH search space offset, and PRACH CE level. It is not limited.

Here, the correspondence between the PRACH CE level and CE mode C is a one-to-one correspondence, i.e. when a particular PRACH CE level corresponds to CE mode C, it no longer corresponds to another CE mode; The correspondence between PRACH CE level and CE mode C may be a one-to-many correspondence, ie when a particular PRACH CE level corresponds to CE mode C, it is still CE mode A or CE mode B. May correspond to other CE modes, such as

Step 2: After acquiring the configuration information of the CE mode C, the terminal reports a request for setting the CE mode C or the capability to support the CE mode C.

In an embodiment of the present invention, the reporting process may include at least one of the following schemes: 1) the terminal performs explicit reporting through RRC signaling, for example, 1 bit may indicate a connection establishment request message ( Returned via MSG3), which indicates that the terminal supports CE mode C or is used to request a CE mode C setting; When the terminal reports the capability, it returns a message indicating that the terminal supports CE mode C or to set up a CE mode C request; 2) The terminal reports a request to set the CE mode C according to the system rule to the base station or the capability to support the CE mode C in an implicit operation manner, for example, the system rule may be as follows. The base station sets the PRACH CE level for CE mode C, and the terminal transmits the PRACH according to the parameter set by the PRACH CE level, that is, the terminal reports a request to set the PRACH CE level or reports CE mode C. Indicates reporting the ability to support.

Step 3: the terminal performs data transmission and reception according to the parameters of the CE mode C set by the system; After receiving the CE mode C configuration signaling, the terminal performs UL transmission and DL reception according to the CE mode C parameter set by the system. The UL transmission performed according to the parameters of CE mode C may include transmitting a PRACH according to a PRACH CE level corresponding to at least CE mode C, transmitting a PUCCH according to a set PUCCH or transmitting a PUSCH scheduled by CE mode C. Establishing according to CE mode C, obtaining scheduling information by reading a corresponding DCI format or RAR message, and transmitting a PUSCH.

For an embodiment of the present invention, the CE mode C configuration signaling may be user specific signaling or contention resolution message (MSG4); The CE mode C parameters set by the system include configuration parameters for at least Bandwidth Limited / Coverage Enhanced (BL / CE) UEs in the Release 14 version specification of CE mode B, and the associated configuration parameters are probably narrowband index indications and / or Or PRB index indications and / or resource unit number indications. The data transmission performed by the terminal according to CE mode C includes at least one of transmission of a PUSCH channel, transmission of HARQ-ACK, and reception of MPDCCH.

Here, the transmission content of the PUSCH channel includes service data and / or RAR; Receiving the MPDCCH includes receiving at least a corresponding format of DCI, namely DCI format 6-0C / 6-1C.

Some flow examples in which a user supporting CE mode C performs DL reception and UL transmission according to CE mode C are given below.

22 shows an example of the operational flow of the terminal. In this embodiment, CE mode B may be replaced with CE mode A to form a new example.

In this example, the terminal reports the CE mode C request (or capability) in a combination of implicit and explicit indications. First, the terminal knows whether the cell supports setting CE mode C by reading a system message. If the cell supports the CE mode C configuration, the terminal selects the PRACH CE level corresponding to CE mode B / CE mode C according to the DL measurement, transmits the PRACH according to this CE level configuration parameter, and sends the CE mode B Receive a RAR message accordingly. Here, the PRACH CE levels of the corresponding CE mode B / CE mode C are fixed by the system and define one or more PRACH CE levels of CE mode B in the Release 14 version specification to support CE mode C simultaneously. For example, it is used to define PRACH CE level 2 and level 3 corresponding to CE mode B, where level 3 is used to simultaneously support CE mode B and CE mode C; Subsequently, the terminal reports to the base station whether the terminal supports or uses CE mode C in the connection establishment request message. When reporting information supporting or using CE mode C, after success (ie, after the terminal receives the ACK feedback of the connection establishment request message), the terminal can perform UL transmission and DL reception according to CE mode C. Or; The terminal performs UL transmission and DL reception according to CE mode B.

For an embodiment of the present invention, in this example, the UL resource scheduling result of CE mode C may cover all UL resource scheduling results of CE mode B in the prior art, and the DCI design in Table 12 may be used. In this case, the terminal needs to select the CE mode B or the CE mode C according to the DL measurement result, and when the cell and the terminal both support the CE mode C, the terminal sets the CE mode C; When a party does not support setting up CE mode C, the terminal will set up CE mode B.

Another example of the operational flow of the terminal is provided in FIG. 24.

In the case of an embodiment of the invention, in this example, the terminal reports the capability (or request) for CE mode C in an implicit manner according to a particular rule, and the system provides a dedicated PRACH CE level to support CE mode C. You need to define it.

First, the terminal reads a system message to know the PRACH CE level setting parameter corresponding to CE mode C. Then, when the DL measurement result of the terminal satisfies the RSRP threshold requirement of PRACH CE level corresponding to CE mode C, the terminal transmits PRACH according to the PRACH CE level setting corresponding to CE mode C; The base station may determine the CE mode of the terminal according to the PRACH CE level selected by the terminal; In this case, the terminal may perform the following DL reception and UL transmission process according to CE mode C. If the system is defined as receiving a RAR message in CE mode C (including format, scheduled time-frequency resources, etc.), then the terminal may perform UL and DL physical processes according to CE mode C below.

25 shows a third example of the operational flow of the terminal.

In the case of an embodiment of the invention, in this example, the terminal reports the CE mode C request (or capability) in an explicit manner according to certain rules.

First, the terminal finds out by reading the system message whether the cell supports setting CE mode C; Thereafter, the terminal may report a CE mode C request (or capability) in the connection establishment request message MSG3; The connected terminal may report a CE mode C request (or capability) through the terminal capability reporting process; At this time, the terminal may perform DL reception and UL transmission according to CE mode C; The terminal may perform UL and DL physical processes according to CE mode C after receiving user specific signaling for indicating CE mode C of the base station.

In order to realize the object of the present application, a method of designing a channel interleaver for UL subcarrier level scheduling is described below. The function of the channel interleaver is to input the encoded sequence of bits into the channel interleaver to achieve the mapping first in the time domain, and then to achieve the mapping in the frequency domain of the transmit waveform, but the scrambling, modulation, layer mapping, transform precoding and precoding etc. Interleaved bit sequences passing through the same flow are finally mapped onto resource particles. For UL subcarrier level scheduling, the time domain length of a single transport block UL transmission over multiple subframes is provided. When a conventional channel interleaver is designed for the transmission of UL subcarrier level scheduling, the data bits transmitted in the same subframe are not consecutive bits in the coded bit sequence, so that the base station does not help to reduce the reception delay. It is necessary to decode only after receiving all subframes occupied by the transmission block of C, which will affect the existing eMTC base station receiver implementation.

로서 나타내어지고,

의 값은

이며, 여기서

는 하나의 서브프레임에서 PUSCH 송신을 위한 단일 반송파 FDMA 심볼의 수이거나 상위 계층 시그널링에 의해 설정된 UL 파일럿에서의 PUSCH 송신을 위한 단일 반송파 FDMA 심볼의 수이다. 채널 인터리빙 매트릭스를 생성하도록 설계된 기존의 프로토콜(TS36.212, Release 14)에 따르면, 행과 열의 수는

및

로서 기록되었으며, 채널 인터리빙 매트릭스는 다음과 같이 표시된다:The channel interleaver used for UL subcarrier level scheduling transmission includes interleaving matrix partitioning. Preferably, when the interleaved coded bit sequence is output after the interleaving matrix division, the interleaved coded bit sequence is output sequentially according to the index order of the divided interleaving matrix. In a particular embodiment, the number of channel interleaving matrix columns is

Represented as

The value of

, Where

Is the number of single carrier FDMA symbols for PUSCH transmission in one subframe or the number of single carrier FDMA symbols for PUSCH transmission in UL pilot set by higher layer signaling. According to the existing protocol (TS36.212, Release 14) designed to generate a channel interleaving matrix, the number of rows and columns is

And

And the channel interleaving matrix is expressed as:

는 채널 시퀀스 인코딩을 통과하는 비트 시퀀스이고, 데이터 전송 블록 비트, CSI 비트, 랭크 정보 비트 및 HARQ 응답 메시지 비트 중 하나를 적어도 포함한다. 더욱이, 상술한 치수

을 갖는 채널 인터리빙 매트릭스는 치수

을 갖는 몇몇 채널 인터리빙 매트릭스로 분할되며, 여기서,

및

는 DCI에 나타내어진 UL 송신 부반송파의 수이고, 여기서 송신 부반송파 수는 DCI에 할당된 부반송파 수와 동일하거나 상이할 수 있으며, DCI에 부반송파를 할당하는 방법은 표 6/표 7에 도시된 바와 같다. 치수

차원을 갖는 상술한 채널 인터리빙 매트릭스의 각각의

행은 치수

를 갖는 채널 인터리빙 매트릭스를 형성하며, 1번째 치수가

인 채널 인터리빙 매트릭스는 다음과 같다:Where sequence

Is a bit sequence that passes through channel sequence encoding and includes at least one of a data transport block bit, a CSI bit, a rank information bit, and an HARQ response message bit. Moreover, the above dimensions

Channel interleaving matrix with dimensions

Partitioned into several channel interleaving matrices, where

And

Is the number of UL transmission subcarriers shown in the DCI, where the transmission subcarriers may be the same as or different from the number of subcarriers allocated to the DCI, and the method of allocating the subcarriers to the DCI is shown in Table 6 / Table 7. size

Each of the above-described channel interleaving matrices having dimensions

Row dimensions

Form a channel interleaving matrix with

The in channel interleaving matrix is as follows:

이고,

이다. 채널 인터리버의 출력은 치수

를 갖는 채널 인터리빙 매트릭스의 인덱스 순서에 따라, 치수

를 갖는 채널 인터리빙 매트릭스의 각각의 인터리빙 시퀀스는 오름차순에 따라 출력되고; 치수

를 갖는 각각의 채널 인터리빙 매트릭스가 인터리빙 시퀀스를 출력하는 방식은 행에 따라 인터리빙 매트릭스의 요소를 판독하는 것이다. 치수

를 갖는

개의 채널 인터리빙 매트릭스에 의해 출력된 캐스케이딩 인터리빙 시퀀스(cascading interleaving sequence)는 채널 인터리버에 의해 출력된 완전한 인터리빙 비트 시퀀스를 형성한다. 채널 인터리버 설계에 의해 출력된 비트 시퀀스에 따르면, 자원 입자의 매핑이 완료된 후, 동일한 서브프레임에서 반송되는 데이터 정보는 채널 인코딩 비트 시퀀스에서 연속적인 세그먼트가 되도록 보장될 수 있음으로써, 기지국이 전송 블록의 서브프레임의 일부를 수신할 때 디코딩을 시작할 수 있다.here,

ego,

to be. The output of the channel interleaver is dimensioned

According to the index order of the channel interleaving matrix with

Each interleaving sequence of the channel interleaving matrix having? Is output in ascending order; size

The manner in which each channel interleaving matrix with s outputs the interleaving sequence is to read the elements of the interleaving matrix according to the row. size

Having

The cascading interleaving sequence output by the two channel interleaving matrices forms a complete interleaving bit sequence output by the channel interleaver. According to the bit sequence output by the channel interleaver design, after mapping of the resource particles is completed, data information carried in the same subframe can be guaranteed to be a continuous segment in the channel encoding bit sequence, so that the base station Decoding may begin upon receipt of a portion of the subframe.

An embodiment of the present invention provides a terminal. As shown in FIG. 26, the terminal includes a determining module 71, a first transmitting module 72, a first receiving module 73, and a data transmitting module 74.

A determining module (71) for determining whether the base station supports the first scheduling mode according to the setting information of the first scheduling mode sent by the base station;

A first sending module 72 for sending a request message and / or a capability message to a base station when the base station supports the first scheduling mode, the request message being used to request the base station to set a first scheduling mode for the terminal, The capability message is used to report a scheduling mode supported by the terminal;

A first receiving module (73) for receiving scheduling information of the first scheduling mode sent by the base station; And

And a data transmission module 74 for transmitting and receiving data according to scheduling information under a first scheduling mode received by the first receiving module.

An embodiment of the present invention provides a terminal in comparison with the prior art, and the terminal in the embodiment of the present invention determines whether the base station supports the first scheduling mode according to the setting information of the first scheduling mode transmitted by the base station. . If the base station supports the first scheduling mode, the terminal sends a request message and / or capability message to the base station, requesting the base station to set the first scheduling mode for the terminal or report the scheduling mode supported by the terminal. . When the base station receives a request message and / or a capability message sent by the terminal and determines that the terminal scheduling mode is the first scheduling mode, the base station transmits scheduling information to the terminal under the first scheduling mode, and the terminal receives the first scheduling. In the mode, data is transmitted and received according to the scheduling information. That is, in the embodiment of the present invention, a new scheduling mode, that is, the first scheduling mode, is shown in the embodiment of the present invention. When both the terminal and the base station support the first scheduling mode, the base station may transmit the first scheduling mode to the terminal so that the terminal and the base station can transmit and receive data in the new scheduling mode.

An embodiment of the present invention provides a base station. As shown in FIG. 27, the base station includes a broadcasting module 81, a second receiving module 82, and a second transmitting module 83,

A broadcasting module 81 for broadcasting a configuration message in a first scheduling mode when the base station supports the first scheduling mode;

A second receiving module 82 for receiving a request message and / or a capability message sent by a terminal, wherein the request message is used to request a base station to set a first scheduling mode for the terminal, and the capability message is sent by the terminal. A second receiving module 82, used to report a supported scheduling mode;

And a second transmitting module 83 for transmitting scheduling information of the first scheduling mode to the terminal when the terminal scheduling mode is the first scheduling mode such that the terminal transmits and receives data according to the scheduling information under the first scheduling mode.

An embodiment of the present invention provides a base station. Compared with the prior art, in the embodiment of the present invention, the terminal determines whether the base station supports the first scheduling mode according to the setting information of the first scheduling mode transmitted by the base station, and when the base station supports the first scheduling mode The terminal sends a request message and / or a capability message to the base station to request the base station to set a first scheduling mode for the terminal or to report the scheduling mode supported by the terminal. When the base station receives a request message and / or a capability message sent by the terminal and determines that the terminal scheduling mode is the first scheduling mode, the base station transmits scheduling information to the terminal under the first scheduling mode, and the terminal receives the first scheduling. In the mode, data is transmitted and received according to the scheduling information. That is, in the embodiment of the present invention, a new scheduling mode, that is, the first scheduling mode, is shown in the embodiment of the present invention. When both the terminal and the base station support the first scheduling mode, the base station may transmit the scheduling information to the terminal under the first scheduling mode so that the terminal and the base station can transmit and receive data in the new scheduling mode.

The terminal and the base station provided in the embodiment of the present invention may implement the above-described method embodiment. For specific functional implementations, reference is made to the description in the method embodiments, and details are not described herein again.

Those skilled in the art should understand that embodiments of the present invention include devices that perform one or more of the operations as described in embodiments of the present invention. Such devices may be specially designed and manufactured as intended, or may include devices well known as general purpose computers. Such a device has a computer program stored on the device, which is selectively activated or reconfigured. Such a computer program may be stored on a device (eg, computer) readable medium or any type of medium suitable for storing electronic instructions and each coupled to a bus, wherein the computer readable medium may be any type of disk (floppy). Disks, hard disks, including optical disks, CD-ROMs, and magneto-optical disks), read-only memory (ROM), random access memory (RAM), erasable programmable read-only memory (EPROM), electrical erasable programmable Read-Only Memory), flash memory, magnetic card or optical line card. In other words, the readable medium includes any medium that stores or transmits information in a device (eg, computer) readable form.

Those skilled in the art will appreciate that computer program instructions may be used to realize each block in schematic and / or block diagrams and / or flow diagrams, as well as to implement a combination of blocks in structure and / or block diagrams and / or flowcharts. You have to understand. Those skilled in the art can provide these computer program instructions to a general purpose computer, special purpose computer, or other processor of the programmable data processing means to be implemented, thereby providing a solution specified as a block in a schematic and / or block diagram and / or flowchart. It should be understood that it is executed by a computer or other processor of programmable data processing means.

Those skilled in the art should understand that the steps, measurements and solutions in the operations, methods and flows already discussed in the embodiments of the present invention may be replaced, changed, combined or deleted. Moreover, other steps, measurements, and solutions in the operations, methods, and flows already discussed in the embodiments of the present invention may also be replaced, changed, rearranged, disassembled, combined, or deleted. Moreover, the prior art steps, measurements, and solutions in the operations, methods, and flows disclosed in the embodiments of the present invention may also be replaced, modified, rearranged, disassembled, combined, or deleted.

The foregoing descriptions are merely some implementations of embodiments of the present invention. For those skilled in the art, various improvements and modifications may be made without departing from the principles of the embodiments of the present invention, which should be considered to be within the protection scope of the embodiments of the present invention.

Claims (15)

In the method for receiving scheduling information,
Receiving downlink control information (DCI); And
Determining scheduling information corresponding to the PUSCH in the DCI according to a mapping relationship between a set transmission resource used for a physical uplink shared channel (PUSCH) and scheduling information in the DCI. Way. The method of claim 1,
Determining scheduling information corresponding to the PUSCH in the DCI according to a mapping relationship between the set transmission resource used for the physical uplink shared channel (PUSCH) and the scheduling information in the DCI,
Determining scheduling information corresponding to the PUSCH in the DCI according to a relative position of a time-frequency resource location used for the PUSCH in a first time-frequency resource region. The method of claim 2,
Determining scheduling information corresponding to the PUSCH in the DCI according to the relative position of the time-frequency resource position used for the PUSCH in the first time-frequency resource region,
Dividing the time-frequency resource region into several minimum scheduling units;
Determining a mapping relationship between a minimum scheduling unit corresponding to the time-frequency resource location used to transmit the PUSCH and scheduling information in the DCI; And
Determining scheduling information corresponding to the PUSCH in the DCI according to the mapping relationship. The method of claim 1,
After determining the scheduling information corresponding to the PUSCH in the DCI according to the mapping relationship between the set transmission resource used for the physical uplink shared channel (PUSCH) and the scheduling information in the DCI, the determined scheduling information is confirmed. If ACK:
Terminating the ongoing PUSCH transmission corresponding to the acknowledgment (ACK) information;
Deleting an UL grant corresponding to the PUSCH;
Releasing the remaining portion of the transmission resource for the PUSCH;
Clearing a buffer of a hybrid automatic retransmission request (HARQ) process corresponding to the PUSCH; And
Executing at least one of terminating monitoring of a physical downlink control channel (PDCCH). In the user device,
A downlink control information obtaining module, configured to obtain downlink control information (DCI); And
A scheduling information determining module, configured to determine scheduling information corresponding to the PUSCH in the DCI according to a mapping relationship between the configured transmission resource used for a physical uplink shared channel (PUSCH) and scheduling information in the DCI. User device. In the information transmission method applied to a terminal,
Determining whether the base station supports the first scheduling mode according to the setting information of the first scheduling mode transmitted by the base station; And
If the base station supports the first scheduling mode, the terminal sending a request message and / or a capability message to the base station, wherein the request message causes the base station to set the first scheduling mode for the terminal. Transmitting, wherein the capability message is used for requesting, the capability message is used for reporting a scheduling mode supported by the terminal; And
Receiving scheduling information under the first scheduling mode transmitted by the base station, and transmitting and receiving data according to the scheduling information under the first scheduling mode. The method of claim 6,
Prior to receiving the scheduling information under the first scheduling mode sent by the base station,
Receiving an acknowledgment (ACK) message sent by the base station, the ACK message being used to notify the terminal that the first scheduling mode will subsequently be used for scheduling;
Receiving scheduling mode setting information sent by the base station; And
And determining one of a scheduling mode subsequently used by the base station according to the scheduling mode setting information. The method according to claim 6 or 7,
Receiving scheduling information under the first scheduling mode transmitted by the base station, and transmitting and receiving data according to the scheduling information under the first scheduling mode,
Monitoring downlink control information (DCI) under the first scheduling mode transmitted by the base station, wherein the DCI comprises a DCI of a first format and a DCI of a second format, the DCI of the first format The monitoring step being used to carry UL grant information and the DCI of the second format is used to carry DL grant information; And
Performing UL transmission according to the DCI of the first format and / or performing DL reception according to the DCI of the second format. The method according to any one of claims 6 to 8,
The setting information of the first scheduling mode is
An indication message indicating that the base station supports a first scheduling mode; And / or a Physical Random Access Channel (PRACH) CE Level Setup message corresponding to the first scheduling mode;
The PRACH CE level setting message corresponding to the first scheduling mode corresponds to a PRACH transmission repetition number, a preamble index, a PRACH frequency modulation offset, a machine type communication physical downlink control channel (MPDCCH) search space offset, and a PRACH CE level. And at least one of a reference signal reception power (RSRP) threshold. The method of claim 9,
The step of transmitting the configuration request message and / or capability message to the base station,
Determining the PRACH CE level;
If the scheduling mode corresponding to the PRACH CE level is the first scheduling mode, carrying the setup request message and / or capability message in a random access request message sent to the base station; And
If the scheduling mode corresponding to the PRACH CE level includes at least two scheduling modes, returning the setup request message and / or capability message to a connection setup request message sent to the base station, wherein the at least 2 Scheduling modes include the carrying step comprising the first scheduling mode. The method of claim 9,
The step of transmitting the configuration request message and / or the capability message to the base station,
Transmitting a connection establishment request message to the base station, wherein the connection establishment request message carries the establishment request message and / or the capability message;
Transmitting the setup request message and / or the capability message to the base station if the terminal has already established a connection with the base station. The method according to any one of claims 8 to 11,
Performing uplink (UL) transmission according to the DCI of the first format,
Obtaining a resource allocation from the DCI of the first format, and
Performing the UL transmission in accordance with the resource allocation;
The resource allocation may include narrowband index indications; Physical resource block (PRB) index indications; Subcarrier index indications; And at least one of resource unit number indications. In the information transmission method applied to the base station,
When the base station supports a first scheduling mode, broadcasting a configuration message of the first scheduling mode;
Request message and / or capability message sent by a terminal-the request message is used to request that the base station establishes the terminal for the first scheduling mode, and the capability message indicates a scheduling mode supported by the terminal. Used to report; And
When the terminal scheduling mode is the first scheduling mode, transmitting the scheduling information under the first scheduling mode such that the terminal transmits and receives data according to the scheduling information under the first scheduling mode. Information transmission method applied. In the terminal,
A determination module for determining whether the base station supports the first scheduling mode according to the setting information of the first scheduling mode transmitted by the base station;
Request message and / or capability message when the base station supports the first scheduling mode-the request message is used to request the base station to set the first scheduling mode for the terminal, and the capability message is sent to the terminal Used to report a scheduling mode supported by the first transmission module;
A first receiving module for receiving scheduling information of a first scheduling mode sent by the base station; And
And a data transmitting module configured to transmit and receive data according to the scheduling information under the first scheduling mode received by the first receiving module. In the base station,
A broadcasting module for broadcasting a configuration message in the first scheduling mode when the base station supports the first scheduling mode;
Request message and / or capability message sent by a terminal-the request message is used to request the base station to set the first scheduling mode for the terminal, and the capability message indicates a scheduling mode supported by the terminal. Used to report a second receiving module; And
And a second transmitting module configured to transmit scheduling information of a first scheduling mode to the terminal when the terminal scheduling mode is the first scheduling mode such that the terminal transmits and receives data according to the scheduling information under the first scheduling mode. , Base station.

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