KR20180018987A - Methods for allocating data channel resources in a wireless communication system and apparatuses - Google Patents

Abstract

According to embodiments of the present invention, provided are uplink and downlink data channels (i.e. PDSCH and PUSCH) resource allocating method for a machine type communication (MTC) terminal in a 3GPP LTE/LTE-advanced system and a downlink control information (DCI) configuring method therefor. Especially, provided are an uplink and downlink data channel resource allocating method for a further enhanced MTC terminal which supports uplink and downlink data channel (i.e. PDSCH and PUSCH) bandwidths enhanced compared to an MTC terminal (BL/CE UE) defined in LTE rel-13.

Description

TECHNICAL FIELD [0001] The present invention relates to a method and apparatus for allocating data channel resources in a wireless communication system,

The present invention relates to a method and apparatus for allocating uplink / downlink data channel resources in a wireless communication system.

As LTE / LTE-Advanced networks spread, mobile operators want to minimize the number of Radio Access Terminals (RATs) to reduce network maintenance costs. However, since the conventional MTC (Machine Type Communication) products based on the GSM / GPRS network are increasing, mobile communication companies use an LTE / LTE-Advanced network for general data transmission and a GSM / GPRS network for MTC There is a problem that two RATs must be operated respectively.

Therefore, in order to reduce the terminal cost of a conventional LTE / LTE-Advanced terminal, the transmission / reception bandwidth of the terminal is limited to 6 PRBs (Physical Resource Blocks), and the number of transmit and receive antennas is limited to one. CE) mode is defined as a CE (Coverage Enhancement) mode considering MTC application scenarios such as Smart Metering installed in a 'deep indoor' environment such as a mobile phone, Standard technology is defined in 3GPP Release-13.

Further, a discussion on additional enhancement to the BL / CE UE defined in 3GPP Release-13 will be made in 3GPP Release-14.

In the case of a UE requesting improved data rates compared to the existing 3GPP Release-13 BL / CE UE, the PDSCH is extended over the narrowband defined by the size of 6 PRBs based on the maximum transmission / reception bandwidth of the existing 3GPP Release- And the PUSCH transmission / reception bandwidth, there is a problem that it is impossible to reuse the resource allocation method and the DCI format for the corresponding 3GPP Release-13 BL / CE UE.

It is an object of the present embodiments to provide a data channel resource allocation method and a DCI format for a BL / CE UE when supporting an extended data transmission / reception bandwidth to a BL / CE UE defined in 3GPP Release-13.

In one aspect, the present embodiments provide a method of allocating data channel resources in a wireless communication system, the method comprising: constructing a narrowband defined by six consecutive physical resource blocks constituting system bandwidth; Allocating at least one narrow band in a band for transmission and reception of a data channel and transmitting information indicating allocation of one or more narrow bands through downlink control information.

In another aspect, the present embodiments provide a method of monitoring allocation of data channel resources in a wireless communication system, the method comprising: receiving downlink control information from a base station; allocating for transmission and reception of data channels through downlink control information; Identifying one or more narrow bands that have been allocated, and performing transmission and reception of the data channel over the assigned one or more narrow bands.

In another aspect, the present embodiments provide a base station allocating data channel resources in a wireless communication system, the base station comprising: a base station configured to configure a narrowband defined by six consecutive physical resource blocks constituting system bandwidth, A controller for allocating at least one narrow band for transmission / reception of a data channel and generating downlink control information including information indicating allocation of at least one narrow band, and a transmitter for transmitting downlink control information to the terminal / RTI >

According to another aspect of the present invention, there is provided a terminal for monitoring allocation of data channel resources in a wireless communication system, the terminal including: a receiver for receiving downlink control information from a base station; And a control unit for controlling transmission and reception of the data channel through at least one assigned narrow band.

According to the present embodiments, when a BL / CE UE defined in 3GPP Release-13 supports extended data transmission / reception bandwidth, a concrete method of allocating data channel resources and a method of constructing DCI corresponding to resource allocation are provided .

의 예시를 나타낸 도면이다.
도 2는 본 실시예들에 따른 무선 통신 시스템에서 CEModeB로 설정된 BL/CE UE를 위한 자원 블록 할당의 예시를 나타낸 도면이다.
도 3 내지 도 6은 본 실시예들에 따른 무선 통신 시스템에서 BL/CE UE에 의해 모니터되는 MPDCCH 후보의 예시를 나타낸 도면이다.
도 7은 본 실시예들에 따른 무선 통신 시스템에서 반복 레벨의 결정의 예시를 나타낸 도면이다.
도 8은 본 실시예들에 따른 무선 통신 시스템에서 Type1-MPDCCH 공용 검색 공간을 위한 반복 레벨의 예시를 나타낸 도면이다.
도 9는 본 실시예들에 따른 무선 통신 시스템에서 DCI 서브프레임 반복 넘버를 위한 매핑의 예시를 나타낸 도면이다.
도 10은 본 실시예들에 따른 무선 통신 시스템에서 데이터 채널 자원을 할당하는 방법의 과정을 나타낸 도면이다.
도 11은 본 실시예들에 따른 무선 통신 시스템에서 데이터 채널 자원의 할당을 모니터링하는 방법의 과정을 나타낸 도면이다.
도 12는 본 실시예들에 따른 기지국의 구성을 보여주는 도면이다.
도 13은 본 실시예들에 따른 사용자 단말의 구성을 보여주는 도면이다.FIG. 1 is a diagram illustrating a structure of a wireless communication system according to an embodiment of the present invention.

Fig.
2 is a diagram illustrating an example of resource block allocation for a BL / CE UE set to CEModeB in a wireless communication system according to the present embodiments.
3 to 6 are diagrams illustrating examples of MPDCCH candidates monitored by the BL / CE UE in the wireless communication system according to the present embodiments.
7 is a diagram showing an example of determination of the repetition level in the wireless communication system according to the present embodiments.
8 is a diagram illustrating an example of repetition levels for a Type 1-MPDCCH common search space in a wireless communication system according to the present embodiments.
9 is a diagram illustrating an example of a mapping for a DCI subframe repetition number in a wireless communication system according to the present embodiments.
10 is a flowchart illustrating a method of allocating data channel resources in a wireless communication system according to an embodiment of the present invention.
11 is a flowchart illustrating a method of monitoring allocation of data channel resources in a wireless communication system according to the present invention.
FIG. 12 is a diagram illustrating a configuration of a base station according to the present embodiments.
13 is a diagram illustrating a configuration of a user terminal according to the present embodiments.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference numerals whenever possible, even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

Herein, the MTC terminal may mean a terminal supporting low cost (or low complexity) or a terminal supporting coverage enhancement. In this specification, the MTC terminal may mean a terminal supporting low cost (or low complexity) and coverage enhancement. Alternatively, the MTC terminal may refer to a terminal defined in a specific category for supporting low cost (or low complexity) and / or coverage enhancement.

In other words, the MTC terminal in this specification may mean a newly defined 3GPP Release-13 low cost (or low complexity) UE category / type for performing LTE-based MTC-related operations. Alternatively, the MTC terminal may support enhanced coverage over the existing LTE coverage or a UE category / type defined in the existing 3GPP Release-12 or lower that supports low power consumption, or a newly defined Release-13 low cost low complexity UE category / type.

The wireless communication system in the present invention is widely deployed to provide various communication services such as voice, packet data and the like. A wireless communication system includes a user equipment (UE) and a base station (BS, or eNB). The user terminal in this specification is a comprehensive concept of a terminal in wireless communication. It is a comprehensive concept which means a mobile station (MS), a user terminal (UT), an SS (User Equipment) (Subscriber Station), a wireless device, and the like.

A base station or a cell generally refers to a station that communicates with a user terminal and includes a Node-B, an evolved Node-B (eNB), a sector, a Site, a BTS A base transceiver system, an access point, a relay node, a remote radio head (RRH), a radio unit (RU), and a small cell.

That is, in the present specification, a base station or a cell has a comprehensive meaning indicating a part or function covered by BSC (Base Station Controller) in CDMA, Node-B in WCDMA, eNB in LTE or sector (site) And covers various coverage areas such as megacell, macrocell, microcell, picocell, femtocell and relay node, RRH, RU, and small cell communication range.

Since the various cells listed above exist in the base station controlling each cell, the base station can be interpreted into two meanings. i) the device itself providing a megacell, macrocell, microcell, picocell, femtocell, small cell in relation to the wireless region, or ii) indicating the wireless region itself. i indicate to the base station all devices that are controlled by the same entity or that interact to configure the wireless region as a collaboration. An eNB, an RRH, an antenna, an RU, an LPN, a point, a transmission / reception point, a transmission point, a reception point, and the like are exemplary embodiments of a base station according to a configuration method of a radio area. ii) may indicate to the base station the wireless region itself that is to receive or transmit signals from the perspective of the user terminal or from a neighboring base station.

Therefore, a base station is collectively referred to as a base station, collectively referred to as a megacell, macrocell, microcell, picocell, femtocell, small cell, RRH, antenna, RU, low power node do.

Herein, the user terminal and the base station are used in a broad sense as the two transmitting and receiving subjects used to implement the technical or technical idea described in this specification, and are not limited by a specific term or word. The user terminal and the base station are used in a broad sense as two (uplink or downlink) transmitting and receiving subjects used to implement the technology or technical idea described in the present invention, and are not limited by a specific term or word. Here, an uplink (UL, or uplink) means a method of transmitting / receiving data to / from a base station by a user terminal, and a downlink (DL or downlink) .

There are no restrictions on multiple access schemes applied to wireless communication systems. Various multiple access schemes such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), OFDM-FDMA, OFDM- Can be used. An embodiment of the present invention can be applied to asynchronous wireless communication that evolves into LTE and LTE-Advanced via GSM, WCDMA, and HSPA, and synchronous wireless communication that evolves into CDMA, CDMA-2000, and UMB. The present invention should not be construed as limited to or limited to a specific wireless communication field and should be construed as including all technical fields to which the idea of the present invention can be applied.

A TDD (Time Division Duplex) scheme in which uplink and downlink transmissions are transmitted using different time periods, or an FDD (Frequency Division Duplex) scheme in which they are transmitted using different frequencies can be used.

In systems such as LTE and LTE-advanced, a standard is constructed by configuring uplink and downlink based on a single carrier or carrier pair. The uplink and the downlink are divided into a Physical Downlink Control Channel (PDCCH), a Physical Control Format Indicator CHannel (PCFICH), a Physical Hybrid ARQ Indicator CHannel, a Physical Uplink Control CHannel (PUCCH), an Enhanced Physical Downlink Control Channel (EPDCCH) Transmits control information through the same control channel, and is configured with data channels such as PDSCH (Physical Downlink Shared CHannel) and PUSCH (Physical Uplink Shared CHannel), and transmits data.

On the other hand, control information can also be transmitted using EPDCCH (enhanced PDCCH or extended PDCCH).

In this specification, a cell refers to a component carrier having a coverage of a signal transmitted from a transmission point or a transmission point or transmission / reception point of a signal transmitted from a transmission / reception point, and a transmission / reception point itself .

The wireless communication system to which the embodiments are applied may be a coordinated multi-point transmission / reception system (CoMP system) or a coordinated multi-point transmission / reception system in which two or more transmission / reception points cooperatively transmit signals. antenna transmission system, or a cooperative multi-cell communication system. A CoMP system may include at least two multipoint transmit and receive points and terminals.

The multi-point transmission / reception point includes a base station or a macro cell (hereinafter referred to as 'eNB'), and at least one mobile station having a high transmission power or a low transmission power in a macro cell area, Lt; / RTI >

Hereinafter, a downlink refers to a communication or communication path from a multipoint transmission / reception point to a terminal, and an uplink refers to a communication or communication path from a terminal to a multiple transmission / reception point. In the downlink, a transmitter may be a part of a multipoint transmission / reception point, and a receiver may be a part of a terminal. In the uplink, the transmitter may be a part of the terminal, and the receiver may be a part of multiple transmission / reception points.

Hereinafter, a situation in which a signal is transmitted / received through a channel such as PUCCH, PUSCH, PDCCH, EPDCCH, and PDSCH is expressed as 'PUCCH, PUSCH, PDCCH, EPDCCH and PDSCH are transmitted and received'.

In the following description, an indication that a PDCCH is transmitted or received or a signal is transmitted or received via a PDCCH may be used to mean transmitting or receiving an EPDCCH or transmitting or receiving a signal through an EPDCCH.

That is, the physical downlink control channel described below may mean a PDCCH, an EPDCCH, or a PDCCH and an EPDCCH.

Also, for convenience of description, the PDCCH, which is an embodiment of the present invention, may be applied to the PDCCH, and the PDCCH may be applied to the portion described with the EPDCCH.

Meanwhile, the High Layer Signaling described below includes RRC signaling for transmitting RRC information including RRC parameters.

The eNB performs downlink transmission to the UEs. The eNB includes a physical downlink shared channel (PDSCH) as a main physical channel for unicast transmission, downlink control information such as scheduling required for reception of PDSCH, and uplink data channel A physical downlink control channel (PDCCH) for transmitting scheduling grant information for transmission in a Physical Uplink Shared Channel (PUSCH). Hereinafter, the transmission / reception of a signal through each channel will be described in a form in which the corresponding channel is transmitted / received.

[ Rel -13 BL / CE UEs  for MTC  operation]

As the LTE network spreads, mobile operators want to minimize the number of Radio Access Terminals (RATs) to reduce network maintenance costs. However, conventional MTC products based on a GSM / GPRS network are increasing, and MTC using a low data rate can be provided at low cost. Therefore, there is a problem in that two RATs must be operated respectively, since LTE network is used for general data transmission and GSM / GPRS network is used for MTC. Therefore, Of the total revenue. Accordingly, in order to lower the terminal unit price compared to the conventional normal LTE terminal, the transmission / reception bandwidth of the terminal is limited to 6 PRBs (Physical Resource Blocks), and the number of transmission / reception antennas is limited to one, CE UE is defined as a coverage enhancement (CE) mode considering MTC application scenario such as smart metering installed in a 'deep indoor' environment, and a standard technology for supporting the corresponding BL / CE UE is defined in the LTE rel-13 system Defined.

[CE mode definition]

In the LTE Release-13 system, two modes are defined as coverage enhancement modes for BL / CE terminals, CEModeA and CEModeB. CEModeA is a terminal operation mode in which repetition of a wireless channel such as MPDCCH, PDSCH, PUSCH, PUCCH is not applied or a small number of repetition is applied for coverage enhancement of a BL / CE terminal, and CEModeB is a terminal operation mode The CE mode is defined as a terminal operation mode for applying a large number of repetitions to wireless channels and is defined to be signaled for each terminal.

[ Narrowband  definition]

개의 하향 링크 narrowbands 및

개의 상향 링크 narrowbands가 구성되었다. 단, 임의의 시스템 대역폭에서 상기의 narrowband 구성 시, 해당 시스템 대역폭을 구성하는 전체 PRB의 수를 6으로 나눈 나머지에 해당하는 remaining RB(s)에 대해, 해당 remaining RB(s)를 시스템 대역의 양 쪽 band edge에 even하게 두거나(시스템 대역폭이 짝수의 PRBs로 구성된 경우), 혹은 시스템 대역의 센터(시스템 대역이 25 PRBs로 구성된 경우), 혹은 양 edge와 시스템 대역의 센터(시스템 대역이 15 PRBs, 75 PRBs인 경우)에 각각 위치시키고, 이를 제외한 PRBs를 이용해 increasing PRB number로 6개 연속적인 PRBs를 묶어서 상기의 narrowband를 구성하도록 할 수 있다.As described above, in the Rel-13 BL / CE terminal, transmission / reception is possible only at 1.4 MHz (i.e., 6 PRBs) through arbitrary subframes regardless of the system bandwidth. As a result, a transmission band of an arbitrary BL / CE terminal is defined in an arbitrary uplink / downlink subframe, and a narrowband composed of 6 consecutive PRBs is defined as a unit for allocating the bandwidth, and according to each system bandwidth

Lt; RTI ID = 0.0 > narrowbands &

Uplink narrowbands were constructed. However, in the narrowband configuration in the arbitrary system bandwidth, for the remaining RB (s) corresponding to the remaining number obtained by dividing the total number of PRBs constituting the corresponding system bandwidth by six, the remaining RB (s) (System bandwidth is equal to 25 PRBs), or both edge and system bandwidth centers (system bandwidth is 15 PRBs). 75 PRBs), and by using the PRBs other than the PRBs, it is possible to configure the narrowband by grouping six consecutive PRBs with increasing PRB numbers.

Specifically, the narrowband configuration method defined in TS36.211 document is as follows.

[TS36.211 v13.2.0]

[ Downlink narrowbands ]

6.2.7  Narrowbands

A narrowband is defined as six non-overlapping consecutive physical resource blocks in the frequency domain. The total number of downlink bandwidths in the downlink transmission bandwidth configured in the cell is given by

in order of increasing physical resource-block number where narrowband

is composed of physical resource-block indicesThe narrowbands are numbered

in order of increasing physical resource-block number where narrowband

is composed of physical resource-block indices

where

[ Uplink narrowbands ]

5.2.4 Narrowbands

A narrowband is defined as six non-overlapping consecutive physical resource blocks in the frequency domain. The total number of uplink narrowbands in the uplink transmission bandwidth configured in the cell is given by

in order of increasing physical resource-block number where narrowband

is composed of physical resource-block indicesThe narrowbands are numbered

in order of increasing physical resource-block number where narrowband

is composed of physical resource-block indices

where

[Resource allocation and DCI  format for BL / CE UE ]

According to the PDSCH and PUSCH resource allocation method for the BL / CE terminal defined in Rel-13, when a certain base station constructs a DCI including PDSCH or PUSCH resource allocation information for an arbitrary BL / CE terminal, The PDSCH or PUSCH transmission for the / CE terminal is defined to include narrowband index information and RB allocation information within the corresponding narrowband for PRB (or VRB) allocation. In addition, the RB allocation information within the corresponding narrowband is defined to be based on the resource allocation type 2 for the PDSCH and the resource allocation type 0 for the PUSCH based on the continuous VRB resource allocation scheme. However, in case of PUSCH, resource allocation can be performed based on resource allocation type 2 only in a BL / CE terminal in which CEModeB is set.

The specific resource allocation method and the DCI format for the BL / CE terminal defined in accordance with it, respectively, are extracted from TS36.213 and TS36.212 documents and attached below.

[TS36.213 v13.2.0]

DL resource allocation

7.1.6.3 Resource allocation type 2

and

is used in the rest of this subclause. For BL / CE UEs with resource allocation type 2 resource assignment,

and

is used in the rest of this subclause.

rest of this subclause.

VRBs, where

is defined in [3], if the DCI CRC is scrambled by P-RNTI, RA-RNTI, or SI-RNTI. With PDCCH DCI format 1B, 1D with a CRC scrambled by C-RNTI, or with DCI format 1A with a CRC scrambled with C-RNTI, SPS C-RNTI or Temporary C-RNTI distributed VRB allocations for a UE vary from a single VRB up to

VRBs if

is 6-49 and vary from a single VRB up to 16 if

is 50-110. With EPDCCH DCI format 1B, 1D with a CRC scrambled by C-RNTI, or with DCI format 1A with a CRC scrambled with C-RNTI, SPS C-RNTI distributed VRB allocations for a UE vary from a single VRB up to

VRBs if

is 6-49 and vary from a single VRB up to 16 if

is 50-110. With PDCCH DCI format 1C, distributed VRB allocations for a UE vary from

VRB(s) up to

VRBs with an increment step of

, where

value is determined depending on the downlink system bandwidth as shown in Table 7.1.6.3-1 in FIG. 1.In resource allocations of type 2, the resource block assigns information to a scheduled UE. A set of contiguously allocated localized resource blocks or distributed virtual resource blocks. In the case of DCI format 1, 1B, or 1D, one of the bits is indicative of whether the localized virtual resource blocks or distributed virtual resource blocks are assigned (value 0 indicates Localized and value 1 indicates Distributed VRB assignment) while distributed virtual resource blocks are always assigned in case of resource allocation with PDCCH DCI format 1C. Localized VRB allocations for a UE vary from a single VRB up to a maximum number of VRBs spanning the system bandwidth. For DCI format 1A the distributed VRB allocations for a UE vary from a single VRB up to

VRBs, where

is defined in [3], if DCI CRC is scrambled by P-RNTI, RA-RNTI, or SI-RNTI. With PDCCH DCI format 1B, 1D with a CRC scrambled by C-RNTI, or with DCI format 1A with a CRC scrambled with C-RNTI, SPS C-RNTI or Temporary C-RNTI distributed VRB allocations for a UE vary from a single VRB up to

VRBs if

is 6-49 and vary from a single VRB up to 16 if

Is 50-110. With EPDCCH DCI format 1B, 1D with a CRC scrambled by C-RNTI, or with DCI format 1A with a CRC scrambled with C-RNTI, SPS C-RNTI distributed VRB allocations for a single VRB up to

VRBs if

is 6-49 and vary from a single VRB up to 16 if

Is 50-110. With PDCCH DCI format 1C, distributed VRB allocations for a UE vary from

VRB (s) up to

VRBs with an increment step of

, where

Table 7.1.6.3-1 in Fig. One.

) and a length in terms of virtually contiguously allocated resource blocks

. The resource indication value is defined byFor PDCCH DCI format 1A, 1B or 1D, or for EPDCCH DCI format 1A, 1B, or 1D, or MPDCCH DCI format 6-1A, a type 2 resource allocation field consists of a resource indication value ( RIV ) corresponding to a starting resource block (

) and a length in terms of virtually contiguously allocated resource blocks

. The resource indication value is defined by

thenif

then

else

and shall not exceed

where

and shall not exceed

and a length in terms of virtually contiguously allocated resource blocks

The resource indication value is defined by:For PDCCH DCI format 1C, a type 2 resource block assignment field consists of a resource indication value ( RIV ) corresponding to a starting resource block

and a length in terms of virtually contiguously allocated resource blocks

The resource indication value is defined by:

thenif

then

else

and

where

and

UL resource allocation

8.1.1 Uplink resource allocation type 0

. A resource allocation field in the scheduling grant consists of a resource indication value (RIV) corresponding to a starting resource block (

) and a length in terms of contiguously allocated resource blocks (

). For a BL/CE UE, uplink resource allocation type 0 is only applicable for UE configured with CEModeA and

in this subclause. The resource indication value is defined by The resource allocation information for the uplink resource allocation type is indicated by a set of contiguously allocated virtual resource blocks indices denoted by

. A resource allocation field in the scheduling grant consists of a resource indication value ( RIV ) corresponding to a starting resource block

) and a length in terms of contiguously allocated resource blocks (

). For a BL / CE UE, uplink resource allocation type 0 is only applicable for UE configured with CEModeA and

in this subclause. The resource indication value is defined by

thenif

then

else

8.1.3 Uplink resource allocation type 2

Uplink resource allocation type 2 is only applicable for BL / CE UE configured with CEModeB. The resource allocation information for the uplink resource allocation type is shown in Table 8.1.3-1 in Fig. 2.

[TS36.212 v13.2.0]

DCI formats for BL / CE UEs

5.3.3.1.10 Format 6-0A

DCI format 6-0A is used for the scheduling of PUSCH in one UL cell.

The following information is transmitted by means of the DCI format 6-0A:

- Flag format 6-0A / format 6-1A differentiation - 1 bit, where value 0 indicates format 6-0A and value 1 indicates format 6-1A

- Frequency hopping flag - 1 bit, where value 0 indicates frequency hopping is not enabled and value 1 indicates frequency hopping is enabled as defined in section 5.3.4 of [2]

+5 bits for PUSCH as defined in [3]:- Resource block assignment -

+ 5 bits for PUSCH as defined in [3]:

MSB bits provide the narrowband index as defined in section 5.2.4 of [2] -

MSB bits provide the narrowband index as defined in section 5.2.4 of [2]

- 5 bits provide the resource allocation using UL resource allocation type 0 within the indicated narrowband

- Modulation and coding scheme - 4 bits as defined in section 8.6 of [3]

- Repetition number - 2 bits as defined in section 8.0 of [3]

- HARQ process number - 3 bits

- New data indicator - 1 bit

- Redundancy version - 2 bits

- TPC command for scheduled PUSCH - 2 bits as defined in section 5.1.1.1 of [3]

- UL index - 2 bits as defined in sections 5.1.1.1, 7.2.1, 8 and 8.4 of [3] (this field is present only for TDD operation with uplink-downlink configuration 0)

- Downlink Assignment Index (DAI) - 2 bits as defined in section 7.3 of [3] (This field is present only for cases with TDD primary cell and either TDD operation with uplink-downlink configurations 1-6 or FDD operation. reserved when the configured maximum repetition number is greater than 1 for either PDSCH or MPDCCH.

- CSI request - 1 bit as defined in section 7.2.1 of [3]

- SRS request -1 bit. The interpretation of this field is provided in section 8.2 of [3]

- DCI subframe repetition number - 2 bits as defined in section 9.1.5 of [3]

If the number of information bits in format 6-0A mapped onto a given search space is less than the size of the payload size of format 6-1A for scheduling the same serving cell and mapped onto the same search space (including any padding bits appended to format 6 -1A), zeros shall be appended to format 6-0A until the payload size equals that of format 6-1A.

5.3.3.1.11 Format 6-0B

DCI format 6-0B is used for the scheduling of PUSCH in one UL cell.

The following information is transmitted by means of the DCI format 6-0B:

- Flag for format 6-0B / format 6-1B differentiation - 1 bit, where value 0 indicates format 6-0B and value 1 indicates format 6-1B

+3 bits for PUSCH as defined in [3]:- Resource block assignment -

+3 bits for PUSCH as defined in [3]:

MSB bits provide the narrowband index as defined in section 5.2.4 of [2] -

MSB bits provide the narrowband index as defined in section 5.2.4 of [2]

- 3 bits provide the resource allocation within the indicated narrowband as specified in section 8.1.3 of [3]

- Modulation and coding scheme - 4 bits as defined in section 8.6 of [3]

- Repetition number - 3 bits as defined in section 8.0 of [3]

- HARQ process number - 1 bit

- New data indicator - 1 bit

- DCI subframe repetition number - 2 bits as defined in section 9.1.5 of [3]

If the number of information bits in format 6-0B mapped onto a given search space is less than the size of the payload size of format 6-1B for scheduling the same serving cell and mapped onto the same search space (including any padding bits appended to format 6 -1B), zeros shall be appended to format 6-0B until the payload size equals that of format 6-1B.

5.3.3.1.12 Format 6-1A

DCI format 6-1A is used for the compact scheduling of one PDSCH codeword in one cell and random access procedure initiated by a PDCCH order. The DCI corresponding to a PDCCH order can be carried by MPDCCH.

The following information is transmitted by means of the DCI format 6-1A:

- Flag format 6-0A / format 6-1A differentiation - 1 bit, where value 0 indicates format 6-0A and value 1 indicates format 6-1A

Format 6-1A is used for random access procedure initiated by a PDCCH order only if format 6-1A CRC is scrambled with C-RNTI and all remaining fields are set as follows:

+5 bits, where all bits shall be set to 1- Resource block assignment -

+5 bits, where all bits shall be set to 1

- Preamble Index - 6 bits

- PRACH Mask Index - 4 bits, [5]

- Starting CE level - 2 bits provide the PRACH starting CE level as defined in [5]

- All the remaining bits in format 6-1A for compact scheduling assignment of one PDSCH codeword are set to zero

Otherwise,

- Frequency hopping flag - 1 bit, where value 0 indicates frequency hopping is not enabled and value 1 indicates frequency hopping is enabled as defined in section 6.4.1 of [2]

+5 bits for PDSCH as defined in [3]:- Resource block assignment -

+ 5 bits for PDSCH as defined in [3]:

MSB bits provide the narrowband index as defined in section 6.2.7 of [2] -

MSB bits provide the narrowband index as defined in section 6.2.7 of [2]

- 5 bits provide the resource allocation using DL resource allocation type 2 within the indicated narrowband

- Modulation and coding scheme - 4 bits as defined in section 7.1.7 of [3]

- Repetition number - 2 bits as defined in section 7.1.11 of [3]

- HARQ process number - 3 bits (for cases with FDD primary cell), 4 bits (for cases with TDD primary cell)

- New data indicator - 1 bit

- Redundancy version - 2 bits

- TPC command for PUCCH - 2 bits as defined in section 5.1.2.1 of [3]

- If the format 6-1A CRC is scrambled by RA-RNTI:

- The most significant bit of the TPC command is reserved.

of the TBS table defined of [3].- The least significant bit of the TPC command indicates column

of the TBS table defined of [3].

= 2 else

= 3.- If the least significant bit is 0 then

= 2 else

= 3.

Else

- The two bits indicate the most significant bit of the TPC command

- Downlink Assignment Index - number of bits as specified in Table 5.3.3.1.2-2. This field is reserved when the configured maximum repetition number is greater than 1 for either PDSCH or MPDCCH.

- Antenna port (s) and scrambling identity - 2 bits indicating the values 0 to 3, as specified in Table 5.3.3.1.5C-1. This field is present only if PDSCH transmission is configured with TM9.

- SRS request -1 bit. The interpretation of this field is provided in section 8.2 of [3]

- TPMI information for precoding - number of bits as specified in Table 5.3.3.1.3A-1.

- TPMI information indicating which codebook index is used in Table 6.3.4.2.3-1 or Table 6.3.4.2.3-2 of [2] corresponding to the single-layer transmission. This field is present only if PDSCH transmission is configured with TM6.

- PMI confirmation for precoding - 1 bit as specified in Table 5.3.3.1.3A-2. This field is present only if PDSCH transmission is configured with TM6.

- HARQ-ACK resource offset - 2 bits as defined in section 10.1 of [3]

- DCI subframe repetition number - 2 bits as defined in section 9.1.5 of [3]

When the format 6-1A CRC is scrambled with a RA-RNTI, then the fields above are reserved:

- HARQ process number

- New data indicator

- Downlink Assignment Index

- HARQ-ACK resource offset

If the UE is not configured to decode MPDCCH with CRC scrambled by the C-RNTI, and the number of information bits in format 6-1A is less than that of format 6-0A, zeros shall be appended to format 6-1A until the payload size equals that of format 6-0A.

If the UE is configured to decode MPDCCH with CRC scrambled by the C-RNTI and the number of information bits in format 6-1A mapped onto a given search space 6-0A for scheduling the same serving cell and mapped to the same search space, zeros shall be appended to format 6-1A until the payload size equals that of format 6-0A.

5.3.3.1.13 Format 6-1B

DCI format 6-1B is used for the scheduling of one PDSCH codeword in one cell.

The following information is transmitted by means of the DCI format 6-1B:

- Flag for format 6-0B / format 6-1B differentiation - 1 bit, where value 0 indicates format 6-0B and value 1 indicates format 6-1B

Format 6-1B is used for random access procedure initiated by a PDCCH order only if format 6-1B CRC is scrambled with C-RNTI and all remaining fields are set as follows:

+2 bits, where all bits shall be set to 1- Reserved bits -

+2 bits, where all bits shall be set to 1

- Preamble Index - 6 bits

- PRACH Mask Index - 4 bits [5]

- Starting CE level - 2 bits provide the PRACH starting CE level as defined in [5]

- All the remaining bits in format 6-1B for compact scheduling assignment of one PDSCH codeword are set to zero

Otherwise,

- Modulation and coding scheme - 4 bits as defined in section 7.1.7 of [3]

+1 bits for PDSCH as defined in [3]:- Resource block assignment -

+1 bits for PDSCH as defined in [3]:

MSB bits provide the narrowband index as defined in section 6.2.7 of [2] -

MSB bits provide the narrowband index as defined in section 6.2.7 of [2]

RBs with PRB index {0, 1, 2, 3} and value 1 indicates that all 6 PRBs are used.

- Repetition number - 3 bits as defined in section 7.1.11 of [3]

- HARQ process number - 1 bit

- New data indicator - 1 bit

- HARQ-ACK resource offset - 2 bits as defined in section 10.1 of [3]

- DCI subframe repetition number - 2 bits as defined in section 9.1.5 of [3]

When the format 6-1B CRC is scrambled with a RA-RNTI then the following fields are the fields above are reserved:

- HARQ process number

- New data indicator

- HARQ-ACK resource offset

If the UE is not configured to decode MPDCCH with CRC scrambled by the C-RNTI, and the number of information bits in format 6-1B is less than that of format 6-0B, zeros shall be appended to format 6-1B until the payload size equals that of format 6-0B.

If the UE is configured to decode MPDCCH with CRC scrambled by the C-RNTI and the number of information bits in format 6-1B mapped onto a given search space is less than that of format 6-0B for scheduling the same serving cell and mapped to the same search space, zeros shall be appended to format 6-1B until the payload size equals that of format 6-0B.

5.3.3.1.14 Format 6-2

DCI format 6-2 is used for paging and direct indication.

The following information is transmitted by means of the DCI format 6-2:

- Flag for paging / direct indication differentiation - 1 bit, with value 0 for direct indication and value 1 for paging

- If Flag = 0:

- Direct Indication information - 8 bits provide direct indication of system information update and other fields, as defined in [6]

- Reserved information bits are added until the size is equal to that format 6-2 with Flag = 1

- If Flag = 1:

bits for the narrowband index as defined in section 7.1.6 of [3]- Resource block assignment -

bits for the narrowband index as defined in section 7.1.6 of [3]

- Modulation and coding scheme - 3 bits as defined in section 7.1.7 of [3]

- Repetition number - 3 bits as defined in section 7.1.11 of [3]

- DCI subframe repetition number - 2 bits as defined in section 9.1.5 of [3]

[ MPDCCH  Search Space Configuration]

Four search spaces have been defined as MPDCCH search spaces for Rel-13 BL / CE terminals. Type-2 common search space defined for performing monitoring only when set to CEModeA, type-1 common search space for paging, type-2 common search space for random access procedure, and UE- specific search for UE- space is defined.

Attach the following TS36.213 document to extract specific MPDCCH search space configuration.

[TS36.213]

9.1.5 MPDCCH assignment procedure

A BL / CE UE shall have a set of MPDCCH candidates on one or more Narrowbands (described in subclause 5.2.4 of [3]). The set is DCI formats. The Narrowband in a subframe used for MPDCCH monitoring is as described in [3].

A UE that is not a BL / CE UE is not required to monitor MPDCCH.

where

is the number of ECCEs in MPDCCH-PRB-set

of subframe

. Higher layer signaling can configure a BL / CE UE with one or two MPDCCH-PRB-sets for MPDCCH monitoring. The PRB-pairs correspond to an MPDCCH-PRB-set are indicated by higher layers. Each MPDCCH-PRB-set consists of ECCEs numbered from 0 to

where

is the number of ECCEs in MPDCCH-PRB-set

of subframe

.

The MPDCCH-PRB-set (s) can be configured for higher layers for either localized MPDCCH transmission or distributed MPDCCH transmission.

The set of MPDCCH candidates are defined in terms of MPDCCH search spaces.

The BL / CE UE shall monitor one or more of the following search spaces

- a Type 0-MPDCCH common search space if configured with CEmodeA,

- a Type1-MPDCCH common search space,

- a Type2-MPDCCH common search space, and

- a MPDCCH UE-specific search space.

A BL / CE UE configured with CEModeB is not required to monitor Type0-MPDCCH common search space.

The BL / CE UE is not required for simultaneous monitoring MPDCCH UE-specific search space and Type1-MPDCCH common search space.

The BL / CE UE is not required for simultaneous monitoring MPDCCH UE-specific search space and Type2-MPDCCH common search space.

ECCEs, the number of ECCEs refers to the MPDCCH mapping to the REs of the 2+4 PRB set as defined in [3]. An MPDCCH search space

at aggregation level

and repetition level

is defined by a set of MPDCCH candidates where each candidate is repeated in a set of

consecutive BL/CE downlink subframes starting with subframe

. For an MPDCCH-PRB-set

, the ECCEs corresponding to MPDCCH candidate m of the search space

are given by A BL / CE UE is not expected to monitor an MPDCCH candidate, if an ECCE corresponding to that MPDCCH candidate is mapped to a PRB pair that overlaps with a transmission of PDSCH scheduled in the same subframe. For aggregation level

ECCEs, the number of ECCEs refers to the MPDCCH mapping to the REs of the 2 + 4 PRB set as defined in [3]. An MPDCCH search space

at aggregation level

and repetition level

is defined by a set of MPDCCH candidates where each candidate is repeated in a set of

consecutive BL / CE downlink subframes starting with subframe

. For an MPDCCH-PRB-set

, The ECCEs corresponding to MPDCCH candidate m of the search space

are given by

where

is the number of MPDCCH candidates to monitor at aggregation level

in MPDCCH-PRB-set

in each subframe in the set of

consecutive subframes.

is the number of MPDCCH candidates to monitor at aggregation level

in MPDCCH-PRB-set

in each subframe in the set of

consecutive subframes.

for MPDCCH UE-specific search space is determined as described in subclause 9.1.4, and

for Type0-MPDCCH common search space, Type1-MPDCCH common search space and Type2-MPDCCH common search space.

for MPDCCH UE-specific search space is determined as described in subclause 9.1.4, and

for Type 0-MPDCCH common search space, Type 1-MPDCCH common search space and Type 2-MPDCCH common search space.

A BL / CE UE is not expected to monitor MPDCCH in subframes that are not BL / CE DL subframes.

Until BL / CE UE receives a higher layer configuration of MPDCCH UE-specific search space, the BL / CE UE monitors MPDCCH according to the same configuration of MPDCCH search space and Narrowband as MPDCCH scheduling Msg4.

The aggregation and repetition levels define the MPDCCH search spaces and the number of monitored MPDCCH candidates are given as follows:

For MPDCCH UE-specific search space

PRB-pairs, and mPDCCH -NumRepetition=1, and - if the BL / CE UE is configured with

PRB-pairs, and mPDCCH -NumRepetition = 1, and

is substituted with

is substituted with

.- if the MPDCCH-PRB-set is configured for distributed transmission, the aggregation levels define the search spaces and the number of monitored MPDCCH candidates are listed in Table 9.1.4-1a and Table 9.1.4-1b, where

is substituted with

is substituted with

.

is substituted with

and

is substituted with

.MPDCCH candidates are listed in Table 9.1.4-2a and Table 9.1.4-2b, where: MPDCCH-PRB-set is the MPDCCH-PRB-set,

is substituted with

and

is substituted with

.

- otherwise

, the aggregation and repetition levels defining the search spaces and the number of monitored MPDCCH candidates are listed in Table 9.1.5-1a in FIG. 3- if the UE is configured with CEModeA, and

, the aggregation and repetition levels, and the number of MPDCCH candidates are listed in Table 9.1.5-1a in Fig. 3

, the aggregation and repetition levels defining the search spaces and the number of monitored MPDCCH candidates are listed in Table 9.1.5-1b in FIG. 4- if the UE is configured with CEModeA, and

, the aggregation and repetition levels, and the number of MPDCCH candidates are listed in Table 9.1.5-1b in Fig. 4

, the aggregation and repetition levels defining the search spaces and the number of monitored MPDCCH candidates are listed in Table 9.1.5-2a in FIG. 5- if the UE is configured with CEModeB, and

, the aggregation and repetition levels, and the number of MPDCCH candidates are listed in Table 9.1.5-2a in Fig. 5

, the aggregation and repetition levels defining the search spaces and the number of monitored MPDCCH candidates are listed in Table 9.1.5-2b in FIG. 6- if the UE is configured with CEModeB, and

, the aggregation and repetition levels, and the number of MPDCCH candidates are listed in Table 9.1.5-2b in Fig. 6

is the number of PRB-pairs configured for MPDCCH UE-specific search space. When

it is given by the higher layer parameter numberPRB-Pairs-r13, and when

it is given by the higher layer parameter numberPRB -Pairs-r11.

is the number of PRB-pairs configured for MPDCCH UE-specific search space. When

it is given by the higher layer parameter number PRB-Pairs-r13, and when

it is given by the higher layer parameter numberPRB -Pairs-r11 .

are determined from Table 9.1.5-3 in FIG. 7 by substituting the value of

with the value of higher layer parameter mPDCCH-NumRepetition.

are determined from Table 9.1.5-3 in Fig. 7 by substituting the value of

with the value of the higher layer parameter mPDCCH-NumRepetition .

The PRB-pairs within a Narrowband corresponding to an MPDCCH-PRB-set are indicated by higher layers and are used in the description given in subclause 9.1.4.4.

is 6,

and the number of PRB-pairs in an MPDCCH-PRB-set

= 2+4.If higher layer configuration numberPRB -Pairs-r13 for MPDCCH-PRB-set

is 6,

and the number of PRB-pairs in an MPDCCH-PRB-set

= 2 + 4.

If Type2-MPDCCH common search space,

.- PRB-pairs of the 2 PRB sets in the 2 + 4 PRB set correspond to PRB-pairs with the largest two PRB indices in MPDCCH-PRB-set

.

_. - PRB-pairs of the 4 PRB sets in the 2 + 4 PRB set correspond to PRB-pairs with the smallest 4 PRB indices in MPDCCH-PRB-set

_.

- PRB-pairs of the 2 + 4 PRB set in the 2 + 4 PRB set correspond to all PRB-pairs in the MPDCCH-PRB-set

are the same as for MPDCCH UE-specific search space, andFor Type 0-MPDCCH common search space, the narrowband location and the MPDCCH-PRB-set

are the same as for MPDCCH UE-specific search space, and

- if

and repetition levels

given in Table 9.1.5.-3 in FIG. 7. For all other cases,

-

and repetition levels

given in Table 9.1.5.-3 in Fig. 7. For all other cases,

- if

and repetition levels

given in Table 9.1.5.-3 in FIG. 7. For all other cases,

-

and repetition levels

given in Table 9.1.5.-3 in Fig. 7. For all other cases,

- if

and repetition levels

given in Table 9.1.5.-3 in FIG. 7. For all other cases,

-

and repetition levels

given in Table 9.1.5.-3 in Fig. 7. For all other cases,

is 2+4 PRB-pairs, andFor Type 1-MPDCCH common search space, the number of PRB-pairs in MPDCCH-PRB-set

is 2 + 4 PRB-pairs, and

and repetition levels

where the repetition levels are determined from Table 9.1.5-4 in FIG. 8 by substituting the value of

with higher layer parameter mPDCCH - NumRepetition -Paging. -

and repetition levels

where the repetition levels are determined from Table 9.1.5-4 in Fig. 8 by substituting the value of

with higher layer parameter mPDCCH - NumRepetition -Paging .

- For all other cases,

is 2+4 PRB-pairs, andFor Type 2-MPDCCH common search space, the number of PRB-pairs in MPDCCH-PRB-set

is 2 + 4 PRB-pairs, and

- If the most recent coverage enhancement level is used for PRACH is coverage enhancement level 0 and 1, the aggregation and repetition levels define the search spaces and the number of monitored MPDCCH candidates are determined from Table 9.1.5-1b in Fig. 4, by assuming that the number of candidates for <8 as zero.

If the most recent coverage enhancement level is used for PRACH is coverage enhancement levels 2 and 3, the aggregation and repetition levels define the search spaces and the number of monitored MPDCCH candidates are determined from Table 9.1.5-2b in Fig. 6.

are determined from Table 9.1.5-3 in FIG. 7 by substituting the value of

with the value of higher layer parameter mPDCCH -NumRepetition-RA. where

are determined from Table 9.1.5-3 in Fig. 7 by substituting the value of

with the value of the higher layer parameter mPDCCH -NumRepetition-RA .

is applied for

is applied for

substituting the values of

.In tables 9.1.5-1a in FIG. 3, 9.1.5-1b in Fig. 4, 9.1.5-2a in FIG. 5, 9.1.5-2b in FIG. 6, and for Type 0, Type 1, Type 2 MPDCCH common search space,

is applied for

is applied for

substituting the values of

.

For Type 1-MPDCCH common search space and Type 2-MPDCCH common search space, distributed MPDCCH transmission is used.

are given by

consecutive BL/CE DL subframe from subframe

whereFor MPDCCH UE-specific search space, Type 0-common search space, and Type 2-common search space locations of starting subframe

are given by

consecutive BL / CE DL subframe from subframe

where

is a subframe satisfying the condition

where

- subframe

is a subframe satisfying the condition

where

is given by the higher layer parameter mPDCCH - startSF - UESS, - For MPDCCH UE-specific search space, Type 0-common search space

is given by the higher layer parameter mPDCCH - startSF - UESS ,

is given by the higher layer parameter mPDCCH - startSF -CSS-RA-r13 - For Type 2-common search space,

is given by the higher layer parameter mPDCCH - startSF -CSS-RA-r13

is given by higher layer parameter mPDCCH - NumRepetition, and -

is given by higher layer parameter mPDCCH - NumRepetition , and

are given in Table 9.1.5-3 in FIG. 7. -

are given in Table 9.1.5-3 in Fig. 7.

and

that result in non-integer values of

.A BL / CE UE is not expected to be configured with values of

and

that result in non-integer values of

.

and is determined from locations of paging opportunity subframes, For Type 1-common search space,

and is determined from locations of paging opportunity subframes,

, a BL/CE UE shall assume MPDCCH in the same narrowband in the subframe

is dropped.If SystemInformationBlockType1 -BR or SI message is transmitted in one narrowband in subframe

, a BL / CE UE shall assume MPDCCH in the same narrowband in the subframe

is dropped.

and also occur within frame

.The BL / CE UE is not required to monitor an MPDCCH search space if any ECCEs corresponding to any of its MPDCCH candidates occur within a frame before

and also occur within frame

.

For MPDCCH UE-specific search space or for Type 0-common search space if higher layer parameter mPDCCH - NumRepetition is set to 1; or for Type 2-common search space if the higher layer parameter mPDCCH - NumRepetition -RA is set to 1;

- The BL / CE UE is not required to monitor MPDCCH

- For TDD and normal downlink CP, in special subframes for the special subframe configurations 0 and 5 shown in Table 4.2-1 of [3]

- For TDD and extended downlink CP, in special subframes for the special subframe configurations 0, 4 and 7 shown in Table 4.2-1 of [3];

otherwise

- The BL / CE UE is not required to monitor MPDCCH

- For TDD, in special subframes, if the BL / CE UE is configured with CEModeB

- For TDD and normal downlink CP, in special subframes for the special subframe configurations 0, 1, 2, 5, 6, 7 and 9 shown in Table 4.2-1 of [3], if the BL / CE UE is configured with CEModeA

- For TDD and extended downlink CP, in special subframes for the special subframe configurations 0, 4, 7, 8 and 9 shown in Table 4.2-1 of [3], if the BL / CE UE is configured with CEModeA.

The number of MPDCCH repetitions is indicated in the DCI subframe repetition number field according to DCI according to Table 9.1.5-5 in FIG. 9.

[Further enhanced MTC ]

As discussed above, a discussion on additional enhanced features for the BL / CE terminal defined in 3GPP rel-13 will be made in the 3GPP rel-14 system, and the specific scope should be attached as an excerpt from the following WID document RP-161321 do.

[RP-161321]

3 Justification

The Provision of IoT via cellular networks is proving to be a significant opportunity for mobile operators. In Release 13, two classes of low-cost IoT devices with enhanced coverage and long battery life are specified: eMTC devices and NB-IoT devices with UE bandwidths of 6 PRBs and 1 PRB, respectively (1 PRB = a 180-kHz physical resource block).

UE positioning and tracking are important in many IoT applications, such as asset tracking. But GNSS-based positioning method is not suitable for many IoT applications. Additionally, the narrow UE bandwidth poses challenges for the positioning accuracy when using the 3GPP positioning functionalities defined for normal UEs. In Rel-13, only limited positioning functionalities are provided for these UEs. Hence, 3GPP-based IoT eco-system is required to improve the positioning requirements of Rel-13 and considering improvements.

In many cases, the same cell is used for the same information simultaneously, for example in the case of rollout of firmware or software upgrades. Low complexity multicast functionality can be achieved either in the form of a regular MBSFN transmission or as a small extension of the recently introduced single-cell point-to-multipoint transmission (SC-PtM) functionality.

In Rel-13 the requirements of complexity reduction, extended battery life, and coverage enhancements are aimed at devices such as sensors, meters, smart readers, and similar. Other types of devices / use cases, such as voice capable wearable devices and health monitoring devices share some of these requirements. However, a subset of these devices are not fully covered by the Rel-13 because they require higher data rates above 1 Mbps. Rel e-13 eMTC solution is used for the existing Rel-13 eMTC solution. The e-commerce solution is based on the e-commerce solution.

4 Objective

4.1 Objective of SI or Core part WI or Testing part WI

The objective is to specify the following improvements for machine-type communications for BL / CE (eMTC) UEs.

Positioning [ RAN4 , RAN1 ]

* E-CID: RSRP / RSRQ measurement

* E-CID: UE Rx-Tx time difference measurement

* OTDOA: core requirements

* From RAN # 73: Considering the outcome of the NB-IoT accuracy, UE complexity and power consumption for OTDOA can be studied

Multicast  [ RAN2  lead, RAN1 ]

* Extend Rel-13 SC-PTM to support multicast downlink transmission (e.g., firmware or software updates, group message delivery)

* Introduction of necessary enhancements to support narrowband operation, e.g. support of MPDCCH, and coverage enhancement, e.g. repetitions

Mobility enhancements [ RAN4  only]

* Full standard support for inter-frequency measurements for eMTC [RAN4]

Higher data rates [ RAN1 , RAN2 , RAN4 ]

* Specify HARQ-ACK bundling in CE mode A in HD-FDD

* Larger maximum TBS

* Larger max. PDSCH / PUSCH channel bandwidth in connected mode at least in CE mode voice and audio streaming or other applications and scenarios

* Up to 10 DL HARQ processes in CE mode A in FD-FDD

In the present invention, a new rel-14 MTC terminal supporting an extended PDSCH / PUSCH channel bandwidth compared to a rel-13 BL / CE terminal (referred to as a HeMTC terminal for convenience of explanation in the present invention, The PDSCH / PUSCH resource allocation method for the PDSCH / PUSCH resource allocation method and the DCI configuration method therefor will be proposed.

As described above, in the case of the HeMTC terminal requiring improved data rates compared to the existing rel-13 BL / CE terminal, the narrow band defined as the size of 6 PRBs based on the maximum transmission / reception bandwidth of the existing rel-13 BL / CE terminal It is impossible to reuse the resource allocation method and the DCI format for the rel-13 BL / CE terminal because it supports the extended PDSCH and PUSCH transmission / reception bandwidth.

Accordingly, the present invention proposes a PDSCH / PUSCH resource allocation method for a HeMTC terminal.

Point 1. Resource allocation and corresponding DCI  format for HeMTC

Method 1. Multiple narrowbands  Assignment method

A method for allocating a PDSCH / PUSCH resource for an arbitrary HeMTC terminal includes configuring a DCI format for transmitting PDSCH or PUSCH resource allocation information for a HeMTC terminal to include an information area indicating a plurality of narrowband allocation information .

Specifically, the plurality of narrowband allocation information may be composed of starting narrowband index indication information and information indicating the number of consecutively allocated narrowbands from the starting narrowband index, a value of K, and the like. In this case, the starting narrowband index indication information, the number of assigned narrow bands, and the indication information of the K value are defined as separate information areas and independently set or transmitted, or a corresponding narrowband indication value is set through one information area The number of narrow bands continuously allocated to the corresponding starting narrowband index, and the K value can be defined to be derived by the function formula.

Alternatively, the K value may be a fixed value as a function of the capability or system bandwidth of the HeMTC terminal, semi-static through UE-specific / cell-specific RRC signaling, and corresponding PDSCH / It can be defined to include only the indication information of the starting narrowband index through the DCI which transmits the allocation information.

Another method of allocating multiple narrowbands is to define a narrowband group by grouping N consecutive non-overlapping narrowbands for narrowbands configured for an arbitrary system bandwidth, and to transmit DCI format information for PDSCH and PUSCH In the configuration, information indicating the narrowband group may be included. Such a narrowband group is also referred to as a wideband, and the corresponding narrowband group indication information may be wideband indication information.

)까지

개의 narrowbands에 대해(혹은 UL의 #0 ~ #(

)까지

개의 narrowbands에 대해) increasing narrowband number의 순서로 N개의 연속적인 narrowbands로 이루어진 narrowband group #0 ~ #(

)까지(혹은 UL의 경우, narrowband group #0 ~ #(

)까지) narrowband group을 구성한 뒤, 해당 PDSCH 혹은 PUSCH 자원 할당 정보를 전송하는 DCI format을 통해 할당된 narrowband group index 지시 정보를 포함하도록 정의할 수 있다.Specifically, the narrowband # 0 to # (

)Till

For narrowbands (or UL's # 0 to # (

)Till

Narrowband group # 0 to # (consisting of N consecutive narrowbands in increasing order of number of narrowband numbers)

) (Or, in the case of UL, narrowband group # 0 to #

), The narrowband group index may be defined to include the narrowband group index indication information allocated through the DCI format for transmitting the corresponding PDSCH or PUSCH resource allocation information.

In this case, the number N of the narrowbands constituting the one narrowband group is determined by a function such as the capability and system bandwidth of the HeMTC terminal or semi-static through cell-specific / UE-specific RRC signaling Or may be set dynamically via a DCI format that transmits the corresponding PDSCH / PUSCH resource allocation information.

In addition, the DCI format for transmitting the PDSCH or PUSCH resource allocation information of the HeMTC terminal may additionally include PRB (or VRB) allocation information in the plurality of narrowbands in addition to the plurality of narrowband allocation indication information described above.

2. New narrowband  Based resource allocation method

We define a type-2 narrowband (or enhanced narrowband) of a new size (eg M PRBs, where M> 6 is an arbitrary natural number) based on the transmission / reception bandwidth of the PDSCH / PUSCH of the HeMTC, The resource allocation for the PDSCH / PUSCH of the HeMTC terminal can be defined.

That is, in constructing the DCI format for transmitting the PDSCH / PUSCH resource allocation information of an arbitrary HeMTC terminal, it may be defined to include the type-2 narrowband (or enhanced narrowband) allocation information. In this case, the number of consecutive PRBs constituting one type-2 narrowband is determined based on the PDSCH / PUSCH transmission / reception bandwidth of the HeMTC and the system bandwidth, or is set through cell-specific / UE-specific RRC signaling .

In addition, the DCI format for transmitting the PDSCH or PUSCH resource allocation information of the HeMTC terminal includes the type-2 narrowband (or enhanced narrowband) allocation indication information as well as the PRB (or VRB ) Allocation information.

3. Normal LTE DCI format-based resource allocation

DCI format (e.g., DCI format 1A for PDSCH and DCI format 0 for PUSCH) defined for normal LTE terminal as a DCI format for transmitting resource allocation information for the PDSCH / PUSCH of the HeMTC terminal. In this case, when the monitoring of the DCI is performed through the MPDCCH-based search space, the HeMTC terminal extracts the existing DCI format defined for the corresponding MPDCCH (i.e., the DCI formats 6-0A, 6-0B and 6-1A, 6 -1B) based blind decoding based on DCI format for a legacy LTE terminal.

Point 2. DCI monitoring method of HeMTC terminal

In the case of the HeMTC terminal as described in point 1 above, the resource allocation method defined for the rel-13 BL / CE UE for the PDSCH / PUSCH resource allocation and the DCI format 6 sequence and the resource allocation method And thus a new DCI format needs to be defined. However, in the case of the HeMTC terminal, a narrowband-based resource allocation method defined for the rel-13 BL / CE UE according to the set CE mode and the type of message expected to be received (eg, unicast traffic, RAR, It is necessary to perform monitoring on the corresponding DCI format 6-1A, 6-1B or 6-0A, 6-0B or 6-2.

In the case of type-0, type-1, and type-2 common search spaces, the DCM format defined for the rel-13 BL / CE UE and the corresponding PDSCH / PUSCH resources And the USS can be defined to follow the newly defined DCI format for the HeMTC terminal and the corresponding resource allocation method.

In addition, in case of USS, it is required to follow the newly defined DCI format and the resource allocation method for the HeMTC terminal only when it is set to CEModeA. If it is set to CEModeB, the DCI format 6-1B and DCI format 6-0B Monitoring and resource allocation methods accordingly.

Or an information area indicating whether the existing narrowband-based resource allocation instruction defined in rel-13 or a new resource allocation method based on the extended bandwidth is indicated in the newly defined DCI format, Method and whether to apply the new resource allocation method based on the extended bandwidth can be defined to the UE.

FIG. 10 illustrates a process of allocating data channel resources in a wireless communication system according to the present embodiments.

Referring to FIG. 10, a narrowband defined by six consecutive PRBs constituting an overall system bandwidth in the wireless communication system according to the present embodiments is configured (S1000).

In addition, we construct a wideband which is defined as N narrowband which is not overlapped in the narrowband which constitutes the system bandwidth.

Here, the number N of narrowbands constituting one wideband can be determined based on the number of narrwobs constituting the overall system bandwidth.

For example, if the number of narrowbands constituting the total system bandwidth is 4 or more, four narrowbands that are not overlapped constitute one wideband. That is, if the number of narrowbands constituting the total system bandwidth is four or more, N is set to four.

In another example, if the number of narrowbands that make up the total system bandwidth is less than four, then all the narrowbands that make up the system bandwidth can be configured as one wideband. That is, the number of widebands constituting the entire system is set to one.

The narrowband that constitutes one wideband can be configured in the order of increasing number of narrowband.

In the narrowband constituting the system bandwidth, at least one narrowband is allocated as a resource for transmission / reception of the data channel (S1010).

Then, information indicating assignment of the narrowband is transmitted through the downlink control information (DCI) (S1020).

Here, the downlink control information (DCI) may include information indicating an index of a narrowband starting from a narrowband allocated for transmission / reception of a data channel.

In addition, when N non-overlapping narrowbands constitute one wideband, the downlink control information DCI may include information indicating an index of a wideband.

A resource allocated for transmission and reception of a data channel is checked through information on allocation of a narrowband included in the downlink control information (DCI) and information indicating an index of a starting narrowband or an index of a wideband, Thereby enabling transmission and reception of data channels.

FIG. 11 shows a process of a method of monitoring allocation of a data channel in a wireless communication system according to the present embodiments.

Referring to FIG. 11, in a wireless communication system, a terminal receives downlink control information (DCI) indicating a data channel resource allocation from a base station (S1100).

The downlink control information (DCI) may include information indicating an index of a narrowband starting from one or more narrowbands allocated for transmission / reception of a data channel.

Alternatively, if N non-overlapping narrowbands constitute one wideband, they may include information indicating an index of the wideband.

Here, the number N of narrowbands constituting one wideband can be determined based on the number of narrowbands constituting the total system bandwidth, and one wideband is configured in the order of increasing index of the narrowband constituting the system bandwidth.

The terminal checks information on at least one narrowband allocation for transmission and reception of a data channel through the downlink control information (DCI), and indexes of a starting narrowband or a wideband (S1110).

The terminal performs transmission and reception of the data channel based on the narrowband allocation information confirmed through the downlink control information (DCI) (S1120).

Thus, the BL / CE UE defined in 3GPP Release-13 can transmit and receive the data channel using the extended data channel resources.

12 is a diagram illustrating a configuration of a base station 1200 according to the present embodiments.

Referring to FIG. 12, the base station 1200 according to the present embodiment includes a controller 1210, a transmitter 1220, and a receiver 1230.

The controller 1210 controls the overall operation of the base station 1200 according to the resource allocation and corresponding DCI format for the HeMTC and the DCI monitoring method of the HeMTC terminal, which are necessary for carrying out the present invention.

The transmitting unit 1220 and the receiving unit 1230 are used to transmit and receive signals, messages, and data necessary for carrying out the present invention to and from the terminal.

13 is a diagram illustrating a configuration of a user terminal 1300 according to the present embodiments.

13, the user terminal 1300 according to the present embodiment includes a receiving unit 1310, a control unit 1320, and a transmitting unit 1330.

The receiver 1310 receives downlink control information, data, and messages from the base station through the corresponding channel.

In addition, the controller 1320 controls the overall operation of the user terminal 1300 according to the DCI monitoring method of the HeMTC terminal and the resource allocation and corresponding DCI format for the HeMTC, which are necessary for carrying out the present invention described above.

The transmitter 1330 transmits uplink control information, data, and a message to the base station through the corresponding channel.

The standard content or standard documents referred to in the above-mentioned embodiments constitute a part of this specification, for the sake of simplicity of description of the specification. Therefore, it is to be understood that the content of the above standard content and some of the standard documents is added to or contained in the scope of the present invention, as falling within the scope of the present invention.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (20)

A method for allocating data channel resources in a wireless communication system,
Constructing a narrow band defined by six consecutive physical resource blocks constituting the system bandwidth;
Allocating at least one narrow band in the configured narrow band for transmission and reception of a data channel; And
And transmitting information indicating downlink allocation of the at least one narrow band through the downlink control information.
The method according to claim 1,
Wherein the downlink control information comprises information indicating an index of a narrowband starting at the assigned one or more narrow bands.
The method according to claim 1,
Wherein the downlink control information includes information indicating a wideband index composed of N narrow bands that are not overlapped in the narrow band constituting the system bandwidth.
The method of claim 3,
Wherein if the number of the narrow bands constituting the system bandwidth is four or more, the wide bands are composed of four narrow bands that do not overlap.
The method of claim 3,
Wherein the wide band constituting the system bandwidth is configured in the order of increasing the number of the narrow band.
A method for monitoring allocation of data channel resources in a wireless communication system,
Receiving downlink control information from a base station;
Identifying one or more narrow bands allocated for transmission and reception of a data channel through the downlink control information; And
And performing transmission and reception of the data channel through the allocated at least one narrow band.
The method according to claim 6,
Wherein the downlink control information comprises information indicating an index of a narrowband starting at the assigned one or more narrow bands.
The method according to claim 6,
Wherein the downlink control information includes information indicating a wideband index composed of N narrow bands that are not overlapped in the narrow band constituting the system bandwidth.
9. The method of claim 8,
Wherein if the number of the narrow bands constituting the system bandwidth is four or more, the wide bands are composed of four narrow bands that do not overlap.
9. The method of claim 8,
Wherein the wide band constituting the system bandwidth is configured in the order of increasing the number of the narrow band.
A base station allocating data channel resources in a wireless communication system,
Wherein a narrow band is defined as six consecutive physical resource blocks constituting a system bandwidth and one or more narrow bands are allocated for transmission and reception of a data channel in the configured narrow band, A control unit for generating downlink control information including information indicating assignment; And
And a transmitter for transmitting the downlink control information to a mobile station.
12. The method of claim 11,
Wherein the downlink control information includes information indicating an index of a narrow band starting from the assigned at least one narrow band.
12. The method of claim 11,
Wherein the downlink control information includes information indicating a wideband index composed of N narrow bands that are not overlapped in the narrow band constituting the system bandwidth.
14. The method of claim 13,
Wherein the wide band is composed of four narrow bands that do not overlap when the number of narrow bands constituting the system bandwidth is four or more.
14. The method of claim 13,
Wherein the wide band constituting the system bandwidth is configured in the order of increasing the number of the narrow band.
A terminal for monitoring allocation of data channel resources in a wireless communication system,
A receiving unit for receiving downlink control information from a base station; And
And a controller for checking one or more narrow bands allocated for transmission and reception of a data channel through the downlink control information and controlling transmission and reception of the data channel through the allocated one or more narrow bands.
17. The method of claim 16,
Wherein the downlink control information includes information indicating an index of a narrowband starting from the allocated one or more narrow bands.
17. The method of claim 16,
Wherein the downlink control information includes information indicating a wideband index composed of N narrow bands that are not overlapped in the narrow band constituting the system bandwidth.
19. The method of claim 18,
Wherein if the number of the narrow bands constituting the system bandwidth is four or more, the wide band is composed of four narrow bands that do not overlap.
19. The method of claim 18,
Wherein the wide band constituting the system bandwidth is configured in the order of increasing the number of the narrow band.

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