JP6793782B2 - Communication equipment, communication methods, and integrated circuits - Google Patents

Description

The present disclosure relates to communication devices and integrated circuits in the field of wireless communication.

While the rapid growth of mobile data forces operators to use finite frequency spectra with increasing efficiency, WiFi, Bluetooth® alone, etc. make the use of many unlicensed frequency spectra less efficient. .. LTE-U (LTE-unlicensed) can extend the LTE spectrum to unlicensed bands that will directly and dramatically increase network capacity. LTE-U together with LAA (Licensed Assisted Access), especially for large-scale users, for example, highly reliable CCH (Control Channel), LA (Link Adaptation), HARQ, ICIC (Inter Cell Interference Coordination), interference removal, etc. It has higher spectral efficiency than WiFi. LTE-U can appropriately coexist with an existing RAT by a mechanism such as LBT (Listen Before Talk), DFS (Dynamic Flexi Selection), TPC (Transmit Power Control). The network architecture will be simpler and more unified.

In the first embodiment of the present disclosure, a resource scheduling method for wireless communication performed by eNodeB (eNB) is provided, in which wireless communication involves at least a first carrier and a second carrier, which method. The eNB includes sending downlink control information (DCI) to the user equipment (UE) on the first carrier to schedule downlink resources for the physical downlink shared channel (PDSCH) of the second carrier. Can start transmitting bursts on the second carrier at a flexible time independent of the subframe boundaries of the second carrier after the second carrier is occupied by the eNB, which is normal for the second carrier. The DCI for a flexible PDSCH with a burst different from the PDSCH contains information about the time period scheduled for the flexible PDSCH.

In a second embodiment of the present disclosure, a resource determination method for wireless communication performed by a user device (UE) is provided, the wireless communication involves at least a first carrier and a second carrier, which method. , The step of receiving the downlink control information (DCI) transmitted by the eNodeB (eNB) on the first carrier and determining the downlink resource for the physical downlink shared channel (PDSCH) of the second carrier. Including, the UE can receive a burst on the second carrier initiated by the eNB at a flexible time independent of the subframe boundaries of the second carrier after the second carrier has been occupied by the eNB. The DCI for a flexible PDSCH with a burst different from the normal PDSCH of the second carrier contains information about the time period scheduled for the flexible PDSCH.

In a third embodiment of the present disclosure, an eNodeB (eNB) for resource scheduling of wireless communication is provided, wireless communication involves at least a first carrier and a second carrier, where the eNB is a user device. Includes a transmit unit configured to send downlink control information (DCI) on the first carrier to the UE) to schedule downlink resources for the second carrier's physical downlink shared channel (PDSCH). , The eNB can begin transmitting bursts on the second carrier at a flexible time independent of the subframe boundaries of the second carrier after the second carrier has been occupied by the eNB. The DCI for a flexible PDSCH with a burst different from the normal PDSCH contains information about the time period scheduled for the flexible PDSCH.

In a fourth embodiment of the present disclosure, a user device (UE) for resource determination of wireless communication is provided, wireless communication involves at least a first carrier and a second carrier, and the method is eNodeB ( The UE comprises a receiving unit that receives the downlink control information (DCI) transmitted by the eNB) on the first carrier and determines the downlink resource for the physical downlink shared channel (PDSCH) of the second carrier. Can receive a burst on the second carrier initiated by the eNB at a flexible time independent of the subframe boundaries of the second carrier after the second carrier has been occupied by the eNB. The DCI for a flexible PDSCH with a burst different from the normal PDSCH of the carrier contains information about the time period scheduled for the flexible PDSCH.

In the present disclosure, the flexible PDSCH and its corresponding reference signal (RS) can reuse the DwPTS subframe structure to minimize its impact on the specification.

The aforementioned features and other features of the present disclosure will become more fully apparent from the following description and the appended claims made in connection with the accompanying drawings. Understanding that these drawings represent only some embodiments of the present disclosure and therefore should not be considered as limiting the scope of the present disclosure, the present disclosure is made through the use of accompanying drawings. It will be explained more specifically and in detail.

A flowchart of a resource scheduling method for wireless communication according to the embodiment of the present disclosure is illustrated. It is a schematic diagram schematically illustrating the shift of a shortened PDSCH using the DwPTS subframe structure. An example is a block diagram of an eNB according to an embodiment of the present disclosure. A flowchart of a resource determination method for wireless communication according to the embodiment of the present disclosure is illustrated. An example is a block diagram of a UE according to an embodiment of the present disclosure. An exemplary time series diagram for licensed and unlicensed carriers according to the first embodiment of the present disclosure is schematically illustrated. An exemplary time series diagram for licensed and unlicensed carriers according to a second embodiment of the present disclosure is schematically illustrated. An exemplary time series diagram for licensed and unlicensed carriers according to a third embodiment of the present disclosure is schematically illustrated. An exemplary time series diagram for licensed and unlicensed carriers according to a fourth embodiment of the present disclosure is schematically illustrated. An exemplary time series diagram for licensed and unlicensed carriers according to a fifth embodiment of the present disclosure is schematically illustrated. An exemplary time series diagram for licensed and unlicensed carriers according to a sixth embodiment of the present disclosure is schematically illustrated. An exemplary time series diagram for licensed and unlicensed carriers according to a seventh embodiment of the present disclosure is schematically illustrated. An exemplary time series diagram for explaining the cyclic shift of PDSCH according to the seventh embodiment of the present disclosure is schematically illustrated. An exemplary time series diagram for licensed and unlicensed carriers according to another embodiment of the seventh embodiment of the present disclosure is schematically illustrated.

With reference to the accompanying drawings in the detailed description below, the drawings form part of the description. In drawings, similar symbols usually identify similar components, unless the context dictates otherwise. It is readily understood that embodiments of the present disclosure may be arranged, substituted, combined and designed in a wide variety of different configurations, all of which are expressly intended and are part of the present disclosure. Will be.

The method of scheduling resources for unlicensed carriers by eNB is an important issue that needs to be resolved by LAA. The LTE Carrier Aggregation Architecture (Licensed PCell and Unlicensed SCell) is a basic premise. Cross-carrier scheduling with licensed bandwidth is a common mechanism in carrier aggregation for granting resources in unlicensed carriers by transmitting reliable control signals in licensed carriers. Subframes aligned between licensed and unlicensed carriers can reuse the current scheduling mechanism in LTE carrier aggregation. With existing cross-carrier scheduling mechanisms, control and data are sent at the same subframe time, but with different carriers. The eNB can only access the unlicensed channel at a fixed point in time (eg PDSCH boundaries or subframe boundaries), while other nodes such as Wi-Fi are just after a successful CCA (Clear Channel Assessment). You can access the channel. In this sense, the access priority of LAA is not prioritized as compared with Wi-Fi.

The present disclosure provides a mechanism for flexibly scheduling burst start times in unlicensed carriers (also referred to as unlicensed bands). In other words, the eNB may start transmitting bursts on the unlicensed carrier at a flexible time independent of the subframe boundary after the unlicensed carrier is occupied by the eNB (eg, after a successful CCA). it can. In particular, the PDSCH start time in a burst can be flexibly scheduled. By flexibly scheduling the start time of a burst or PDSCH, the eNB may occupy an unlicensed carrier at any moment independent of the subframe boundary immediately after a successful CCA.

Embodiments of the present disclosure may be described in the context of licensed and unlicensed bands, but the disclosure is not limited thereto, with the first carrier (eg, licensed carrier) and second carrier (eg, Ann) in the present disclosure. It is noted that it can be applied to any wireless communication involving two different carriers called (licensed carriers).

The present disclosure provides a resource scheduling method for wireless communication performed by eNB. Wireless communication involves at least a first carrier (eg, a licensed carrier) and a second carrier (eg, an unlicensed carrier). A flowchart of the resource scheduling method is illustrated in FIG. 1 as method 100. Method 100 includes step 101 of transmitting a DCI to the UE on the first carrier to schedule a downlink resource for the PDSCH of the second carrier, the eNB after the second carrier has been occupied by the eNB. The DCI for a flexible PDSCH with a burst different from the normal PDSCH of the second carrier is flexible, allowing the second carrier to start transmitting bursts at a flexible time independent of the subframe boundaries of the second carrier. Contains information about the time period scheduled for a PDSCH. Preferably, the subframe of the second carrier is aligned with the subframe of the first carrier, which can reuse the current scheduling mechanism in LTE carrier aggregation. It should be noted that the normal PDSCH in this case means a PDSCH with a fixed boundary and length. If the subframe of the second carrier does not have a PDCCH, the normal PDSCH boundaries are the same as the subframe boundaries. When the subframe has a PDCCH, the start boundary of the normal PDSCH is the end of the PDCCH, and the end boundary of the normal PDSCH is the end boundary of the subframe in which the normal PDSCH exists. The flexible PDSCH in this case means a PDSCH different from the normal PDSCH. For example, the start and / or end times of a flexible PDSCH are shifted from their respective boundaries of a normal PDSCH. The length of the flexible PDSCH can be shorter or longer than the normal PDSCH.

According to Method 100, the eNB can initiate a burst with a second carrier at a flexible time after a successful CCA, without being limited by subframe boundaries. As used herein, the term "flexible" means that the start time is not limited to subframe boundaries or normal PDSCH boundaries and can be changed as needed. For example, the eNB can start transmitting a signal immediately after a successful CCA. The signal can be a reserved signal, such as an RTS / CTS (Request To Send / Clear To Send) or other signal, followed by a PDSCH, or only a PDSCH. When transmitting a PDSCH, its particle size can be one OFDM symbol. In other words, the flexible start time of the leading PDSCH in the burst can be the first available OFDM symbol after the end time of a successful CCA. Thus, the eNB may occupy a second carrier at any moment independent of the subframe boundary immediately after a successful CCA.

In addition, since the burst start time is flexibly scheduled, the first and / or last PDSCH in the burst may not be aligned with the normal PDSCH, therefore, according to Method 100, for the flexible PDSCH in the burst. The DCI contains information about the time period scheduled for the flexible PDSCH. Perhaps the DCI for the first or last PDSCH in the burst is a flexible PDSCH. For normal PDSCH, the DCI defined in this disclosure can be used as well, in other words, normal PDSCH and flexible PDSCH can use the same DCI format, details of the DCI format will be given later. explain. It should be noted that the information about the period does not necessarily include the start and end times of the PDSCH, but can be any information from which the period can be derived. For example, the information can be the end time or start time and length of the PDSCH. Alternatively, if the start time or end time is known to the UE, only the length will need to be included.

According to the present disclosure, the DCI can be sent on the PDCCH or EPDCCH ((E) PDCCH) of the first carrier after the second channel is occupied by the eNB, or the DCI is the second channel. It can also be sent on the (E) PDCCH of the first carrier before being occupied by the eNB. In addition, the DCI can be sent in the same or different subframes as the subframe sending the PDSCH, and the same subframe can be sent before or after sending the PDSCH (in this case, the terms "before" or "after". Means that the transmission starts "before" or "after"). For example, if EPDCCH is used in the first carrier to send DCI, the PDSCH in the second carrier can start sending before the start of EDPCCH in the same subframe. Alternatively, in particular, the DCI can be sent in the next subframe of the subframe that initiates PDSCH transmission.

According to method 100, some PDSCHs in the burst, especially the first and last PDSCHs, may differ in length from the normal PDSCHs. For example, the first PDSCH starts at the first available OFDM symbol after the end time of a successful CCA and ends at the end boundary of the subframe where the first PDSCH begins, or at the end boundary of the next subframe after the subframe where the first PDSCH begins. Can end with. The leading PDSCH in the former case can be a shortened PDSCH shorter than the normal PDSCH (if the start time of the leading PDSCH happens to be the boundary of the normal PDSCH, it can be the normal PDSCH as well). , The leading PDSCH in the latter case is an extended PDSCH, which is one shortened or normal PDSCH plus one normal PDSCH. The shortened PDSCH and the extended PDSCH belong to the flexible PDSCH. According to the present disclosure, both shortened PDSCH and extended PDSCH can be adopted based on a designed strategy. Preferably, the flexible PDSCH and its corresponding reference signal (RS) reuse the DwPTS (Downlink Pilot Time Slot) subframe structure. For example, for a shortened PDSCH, if the shortened PDSCH start time is not the normal PDSCH start time (eg, the leading PDSCH in flexible scheduling is usually the case), then the shortened PDSCH using the DwPTS subframe structure is by eNB. It can be totally shifted to start with a scheduled OFDM symbol. FIG. 2 schematically illustrates such a shift. It is noted that the existing DwPTS contains one or two OFDM symbols as PDCCH from the starting point. Therefore, when there is no PDCCH in the unlicensed band, there are two possibilities for shortened PDSCH, that is, the shortened PDSCH starts with the first OFDM symbol of DwPTS or the second or third OFDM of DwPTS. It can start with a symbol. In addition, the corresponding PDSCH mapping, RS pattern, and transport block size (TBS) tables can be modified if necessary.

The present disclosure also provides an eNB for resource scheduling of wireless communications. Wireless communication involves at least a first carrier and a second carrier. FIG. 3 schematically illustrates such a block diagram of the eNB 300. The eNB 300 includes a transmission unit 301 configured to transmit DCI to the UE on the first carrier to schedule downlink resources for the PDSCH of the second carrier, and the eNB includes an eNB in which the second carrier is the eNB. After being occupied by the second carrier, the second carrier can start transmitting bursts at a flexible time independent of the subframe boundary of the second carrier, and the burst flexible PDSCH different from the normal PDSCH of the second carrier. DCI for contains information about the time period scheduled for flexible PDSCH.

The eNB 300 according to the present disclosure is necessary for executing various data to process various data and performing various processing and control by the CPU (Central Processing Unit) 310 and the CPU 310 for controlling the operation of each unit of the eNB 300. ROM (Read Only Memory) 313 for storing various programs, RAM (Random Access Memory) 315 for storing intermediate data temporarily created by the CPU 310 in the processing and control procedure, and / or A storage device 317 for storing various programs, data, and the like may be optionally included. The transmission unit 301, CPU 310, ROM 313, RAM 315 and / or storage device 317 and the like are connected to each other via data and / or command bus 320 to transfer signals to each other.

Each of the above units does not limit the scope of this disclosure. According to one implementation of the present disclosure, the function of the transmission unit 301 can be performed by hardware, and the CPU 310, ROM 313, RAM 315 and / or storage device 317 may not be required. Alternatively, the function of the transmission unit 301 can be similarly performed by functional software in combination with the CPU 310, ROM 313, RAM 315 and / or storage device 317 and the like.

Accordingly, on the UE side, the present disclosure provides a resource determination method for wireless communication performed by the UE. Wireless communication involves at least a first carrier and a second carrier. FIG. 4 illustrates a flowchart of the resource determination method 400. Method 400 includes step 401 of receiving the DCI transmitted by the eNB on the first carrier and determining the downlink resource for the PDSCH of the second carrier, in which the UE is occupied by the second carrier by the eNB. After that, it is possible to receive the burst in the second carrier initiated by the eNB at a time independent of the subframe boundary of the second carrier, and at least the DCI and / or the last PDSCH of the burst to the first PDSCH of the burst. DCI for contains information about the time period scheduled for each PDSCH. It should be noted that the above details described on the eNB side can be applied to the UE side as well, and they will be repeated here.

In addition, the present disclosure also provides a UE for resource determination of wireless communications. Wireless communication involves at least a first carrier and a second carrier. FIG. 5 schematically illustrates a block diagram of such a UE 500. The UE 500 includes a receive unit 501 configured to receive the DCI transmitted by the eNB on the first carrier and determine the downlink resource for the PDSCH of the second carrier, and the UE includes a second carrier. After the carrier is occupied by the eNB, it is possible to receive a burst on the second carrier initiated by the eNB at a flexible time independent of the subframe boundary of the second carrier, which is normal for the second carrier. The DCI for a flexible PDSCH with a burst different from the PDSCH contains information about the time period scheduled for the flexible PDSCH.

The UE 500 according to the present disclosure is required to perform various processing and control by the CPU (Central Processing Unit) 510 and the CPU 510 for executing related programs to process various data and controlling the operation of each unit of the UE 500. ROM (Read Only Memory) 513 for storing various programs, RAM (Random Access Memory) 515 for storing intermediate data temporarily created by the processing and control procedure by CPU 510, and / or A storage device 517 for storing various programs, data, and the like may be optionally included. The receiving unit 501, CPU 510, ROM 513, RAM 515 and / or storage device 517 and the like are connected to each other via data and / or command bus 520 to transfer signals to each other.

Each of the above units does not limit the scope of this disclosure. According to one implementation of the present disclosure, the function of the receiving unit 501 can be performed by hardware, and the CPU 510, ROM 513, RAM 515 and / or storage device 517 may not be required. Alternatively, the function of the receiving unit 501 can be similarly performed by functional software in combination with the CPU 510, ROM 513, RAM 515 and / or storage device 517 and the like.

Hereinafter, the present disclosure will be described in detail by embodiment.

(First Embodiment)
In the first embodiment, the eNB starts at the first available OFDM symbol after the second carrier is occupied by the eNB (eg, after a successful CCA) and at the end boundary of the subframe where the first PDSCH begins. The ending PDSCH at the beginning of the burst can be transmitted. For example, after a successful CCA in an unlicensed band, the eNB sends data in PDSCH starting with the first OFDM symbol available for data transmission and ending at the end boundary of the current subframe. Since reserved signals such as preamble, PSS / SSS (Primary Synchronization Signal / Sequence Synchronization Signal) or RTS / CTS can be sent after the end of CCA and before the first PDSCH, the first available OFDM symbol is the first after the end of CCA. It is noted that it does not have to be an OFDM symbol of. The head PDSCH of the burst in the first embodiment can be a shortened PDSCH or a normal PDSCH.

FIG. 6 schematically illustrates an exemplary time series diagram for licensed and unlicensed carriers according to the first embodiment of the present disclosure. As shown in FIG. 6, in the unlicensed band, the data of the leading PDSCH (shortened PDSCH in FIG. 6) can be sent by starting from the first symbol boundary after the CCA, optionally leading. A reservation signal can be sent before the PDSCH. When sending a reservation signal before the first PDSCH, the first PDSCH can start with a subsequent symbol other than the first symbol, and the symbol before the subsequent symbol is not available for the PDSCH, so the subsequent The symbol of can also be called the first available symbol. The end of the first PDSCH is the end boundary of the current subframe, i.e., the first subframe boundary shown in FIG.

If there is no PDCCH area in the unlicensed band in the normal CP (Cyclic Prefix), the normal PDSCH consists of 14 OFDM symbols. The start symbol of the flexibly initiated PDSCH (eg, the first PDSCH of the burst in this embodiment) can be the 1st to 14th symbols depending on the CCA end time, and thus for the flexibly initiated PDSCH. The number of OFDM symbols is 14 to 1. If the number of OFDM symbols is less than 14, the PDSCH is called a shortened PDSCH. If the length of the head PDSCH is 14 symbols, the head PDSCH is a normal PDSCH.

The shortened PDSCH and the corresponding RS (Reference Signal) will reuse the DwPTS subframe structure to minimize its impact on the specification. The shortened PDSCH using the DwPTS subframe structure is totally shifted to begin with the OFDM symbol scheduled by the eNB, as shown in FIG. Only the length of the 6/9/10/11/12 symbol is specified for PDSCH with normal CP in the current DwPTS, and other lengths of shortened PDSCH (if supported) reuse the same structure. Then, a new TBS (Transport Block Size) mapping can be defined as follows.

• For the length of 6/9/10/11/12 OFDM symbols ◆ Reuse the current TBS determination for PDSCH in DwPTS specified in 3GPP 36.213 ◆ RS specified in 3GPP 36.211 (eg) CRS / DMRS) Reuse mapping

• For the length of the 13/14 OFDM symbol ◆ Reuse the current TBS determination for PDSCH in the normal subframe specified in 3GPP 36.213 ◆ RS specified in 3GPP 36.211 (eg CRS / DMRS) Reuse mapping

・ 1/2/3/4/5/7/8 For the length of OFDM symbol ◆ TBS decision □ Candidate-1: New TBS decision, for example

Define, _N in the above equation _PRB is an index of the column in TBS table in 3GPP 36.213, N _'PRB is the total number of PRB allocated, beta is derived from the number of data RE in the target PDSCH (For example, β can be derived by dividing the number of data REs in the target PDSCH by the average number of data RESs in the existing PDSCH, and in addition, different βs are used for different PDSCH lengths. Alternatively, a common β may be used for multiple PDSCH lengths, for example by averaging individual βs).
□ Candidate-2: 4/5/7/8 TBS determination for DwPTS containing the 6 OFDM symbol specified in 3GPP 36.213 for the length of the OFDM symbol, eg

□ Candidate-3: PDSCH of unspecified length will not be scheduled for, for example, 1/2/3 OFDM symbol length ◆ RS Mapping □ Candidate-1: For example, 4/5/7 Reuse the RS (eg CRS / DMRS) mapping specified in 3GPP 36.211 for the length of the / 8 OFDM symbol.

□ Candidate-2: Introduce a new RS, eg, a new DMRS located at the first OFDM symbol of a PDSCH with a length of 1/2/3 OFDM symbol.

The DCI will be sent in the licensed band PDCCH / EPDCCH to indicate the duration of the first PDSCH of the burst in the unlicensed carrier. The DCI can be sent after the unlicensed channel is occupied by the eNB or before the unlicensed channel is occupied by the eNB. For example, the DCI can be sent in the subframe in which the first PDSCH is transmitted or in the next subframe. In the embodiment of FIG. 6, the DCI is sent in the next subframe. As an example, the DCI for the first PDSCH is an end indicator (ie, end subframe boundary field) and a first PDSCH that indicate whether the end time of the first PDSCH is the start boundary or the end boundary of the subframe transmitting the DCI. Includes a length indicator to indicate the length of. In the first embodiment, if the leading PDSCH is a shortened PDSCH (a kind of flexible PDSCH), the DCI defined above will be used. That is, the DCI defined above is for the leading PDSCH as a flexible PDSCH. If the first PDSCH is a normal PDSCH, the normal DCI may be used, or the DCI specified above may be used as well. The choice of DCI format can be specified or set. When the DCI specified above is used for a normal PDSCH (not only for the first PDSCH, but also for other normal PDSCHs in some cases), the length of the PDSCH is in the normal CP. It is set to 14 when there is no PDCCH area.

Specifically, regarding the end subframe boundary field in DCI, one bit is used to indicate the end time (for example, end subframe boundary) for a subframe for sending DCI in (E) PDCCH, for example. be able to. For example, "0" indicates that the PDSCH ends at the start boundary of the subframe sending the DCI (the first subframe boundary in FIG. 6), and "1" indicates the end boundary of the subframe sending the DCI (FIG. 6). Indicates that the PDSCH ends at the second subframe boundary).

For example, with respect to the length indicator for indicating the length of the first PDSCH in units of OFDM symbols, for example, the PDSCH length from 1 to 14 (“14” indicates a normal PDSCH) OFDM symbol using 4 bits is used. Can be shown. However, in order to reduce the signal transduction overhead as well as improve the robustness of the DCI by reducing the code rate, the reduced number of bits is similarly associated with the reduced set of possible start positions. Can be used for. For example, a 2-bit indicator can be used for the length of a 3/6/9/14 OFDM symbol, or a 1-bit indicator can be used for the length of a 7/14 OFDM symbol.

The above method may be applied similarly to OFDM symbols with extended CP. According to the first embodiment, the time for the CCA to succeed is unpredictable, so it may be necessary to buffer PDSCHs of different lengths in the eNB, and the UE will be the previous sub for the leading PDSCH. You may need to buffer one frame.

(Second Embodiment)
In a second embodiment, the eNB begins with the first available OFDM symbol after the second carrier has been occupied by the eNB (eg, after a successful CCA) and begins with the first PDSCH subframe (current subframe). The first PDSCH of the burst ending at the end boundary of the next subframe of the frame) can be transmitted. For example, after a successful CCA in an unlicensed band, the eNB sends data in a PDSCH that begins with the first OFDM symbol available for data transmission and ends at the end boundary of the next subframe of the current subframe. As described in the first embodiment, reserved signals such as preamble, RTS / CTS or PSS / SSS can be sent after the end of the CCA and before the leading PDSCH, so that the first available OFDM symbol is after the end of the CCA. It is noted that it does not have to be the first OFDM symbol of. The head PDSCH of the burst in the second embodiment is an extended PDSCH.

FIG. 7 schematically illustrates an exemplary time series diagram for licensed and unlicensed carriers according to a second embodiment of the present disclosure. As shown in FIG. 7, in the unlicensed band, the leading PDSCH (extended PDSCH) data can be sent by starting from the first symbol boundary after the CCA. Arbitrarily, a reservation signal can be similarly sent before the first PDSCH. The end of the first PDSCH is the end boundary of the next subframe of the current subframe, that is, the second subframe boundary shown in FIG.

As described in the first embodiment, if there is no PDCCH region in the unlicensed band in the normal CP, the normal PDSCH consists of 14 OFDM symbols. Thus, the first portion (shortened PDSCH portion) of the first PDSCH in the second embodiment, starting from the first available OFDM symbol to the end boundary of the current subframe, is 14 to 1 OFDM symbols. Can have. The first part is the same as the head PDSCH in the first embodiment. The second part (normal PDSCH part) of the first PDSCH is a normal PDSCH sent in the next subframe of the current subframe. In a second embodiment, the first part of the leading PDSCH is scheduled with the second part as one extended PDSCH by one DCI in a subframe that sends the second part to, for example, one (group) UE. To.

The bits of the extended PDSCH can be as follows. That is,

1. 1. The separately encoded transport blocks, i.e., the bits in the first part and the bits in the second PDSCH, are encoded separately. For the first part as a shortened PDSCH, PDSCH mapping, RS mapping, and TBS determination from the same shifted DwPTS as used in the first embodiment were similarly performed to minimize the impact on the specifications. Can be used.

2. 2. The jointly encoded transport blocks, i.e., the bits in the first part and the bits in the second part, are jointly encoded and mapped as one extended PDSCH. In this case, the RS mapping specified in 3GPP36.211 is reused and a new TBS determination, for example,

It is possible to define a, _{N PRB} in the above formula is an index of the column in TBS table in 3GPP 36.213, N _'PRB is the total number of PRB allocated, beta data in the target PDSCH RE A coefficient derived from the number of (eg, β can be derived by dividing the number of data REs in the target PDSCH by the average number of data RESs in the existing PDSCH, plus for different PDSCH lengths. Different βs may be used, or common βs may be used for multiple PDSCH lengths, for example by averaging individual βs).

3. 3. The TTI bundling, i.e., the bits in the first part and the bits in the second part, are the same / different RVs (Redundant Versions) of the same coded bits in the transport block, while the first part was used. It can be assumed that the tip is cut off based on the OFDM symbol. In this case, it is possible to reuse the RS mapping specified in 3GPP 36.211 and the TBS specified in 3GPP 36.213.

In the second embodiment, the DCI will be sent in the licensed band PDCCH / EPDCCH to indicate the duration of the first PDSCH of the burst in the unlicensed carrier. The DCI can be sent after the unlicensed channel is occupied by the eNB or before the unlicensed channel is occupied by the eNB. For example, the DCI can be sent in a subframe that sends the first or second part of the leading PDSCH. In the embodiment of FIG. 7, the DCI is sent in a subframe that transmits the second portion. The DCI for the head PDSCH may include at least a length indicator indicating the length of the head PDSCH and optionally include an end indicator indicating the end time of the head PDSCH. In a second embodiment, the subframe that sends the DCI can be fixed or set to be either a subframe that sends the first part of the leading PDSCH or a subframe that sends the second part. Therefore, the UE can know the end of the head PDSCH, and therefore the end indicator can be omitted. For example, with respect to a length indicator for indicating the length of the leading PDSCH in units of OFDM symbols, for example, 4 bits can be used to indicate the PDSCH length from 15 to 28 OFDM symbols. Alternatively, to reduce the signal transduction overhead as well as to improve the robustness of the DCI by reducing the code rate, as well as the reduced number of bits in relation to the reduced set of possible start positions. Can be used for. For example, a 2-bit indicator can be used for the length of a 15/20/23/26 OFDM symbol, or a 1-bit indicator can be used for the length of a 15/20 OFDM symbol.

The above method may be applied similarly to OFDM symbols with extended CP. According to this embodiment, since the time for CCA to succeed is unpredictable, it may be necessary to buffer PDSCHs of different lengths in the eNB, and the UE will set the previous subframe for the first PDSCH. You may need to buffer one.

(Third Embodiment)
In a third embodiment, the eNB begins with the first available OFDM symbol after the second carrier is occupied by the eNB, and follows the end boundary of the subframe where the first PDSCH begins or the subframe where the first PDSCH begins. Sends the first PDSCH of the burst that ends at any of the end boundaries of the subframe. Here, an eNB using one DCI format can adopt both the PDSCH scheduling mechanism in the first embodiment and the second embodiment, and which one is adopted depends on the scheduling strategy in the eNB. Will be done. In other words, whether the shortened PDSCH as in the first embodiment is scheduled or the extended PDSCH as in the second embodiment is scheduled depends on the scheduling strategy in the eNB. One DCI format is used for the case. It is noted that the DCI format in the third embodiment can be used similarly for normal PDSCH. In the third embodiment, PDSCH mapping, RS mapping, TBS determination, and coding can use the same methods as in the first and second embodiments, respectively.

Scheduling strategies in the eNB may consider one or more of the following features: That is,

1. 1. UE capability:
◆ If the UE does not support extended PDSCH, the extended PDSCH will not be scheduled for this UE ◆ If the UE does not support shortened PDSCH, the shortened PDSCH will not be scheduled for this UE ◆ UE is normal If only free PDSCH is supported, the shortened / extended PDSCH will not be scheduled for this UE, that is, the UE will be scheduled only in the middle of the burst.

2. 2. Unlicensed channel conditions:
◆ If the shortened PDSCH contains too few OFDM symbols or does not contain RS, the extended PDSCH will preferably be scheduled.

3. 3. Licensed control overhead:
◆ When the load on the licensed band PDCCH / EPDCCH is high, the extended PDSCH, which requires less scheduling overhead, is preferable.

4. Certain preferences for eNB ◆ For example, predetermined preferences for eNB

The DCI will be sent in the licensed band PDCCH / EPDCCH to indicate the duration of the first PDSCH of the burst in the unlicensed carrier. The DCI can be sent after the unlicensed channel is occupied by the eNB or before the unlicensed channel is occupied by the eNB. For example, FIG. 8 schematically illustrates an exemplary time series diagram for licensed and unlicensed carriers according to a third embodiment of the present disclosure. As shown in FIG. 8, three possible leading PDSCHs in the unlicensed band are illustrated, the one above is the extended PDSCH described in the second embodiment and the central one is the first embodiment. It is a normal PDSCH as a special case described, and the bottom one is a shortened PDSCH described in the first embodiment. To uniformly indicate the duration of the three PDSCHs in one DCI format, the DCI for the first PDSCH sends a subframe or normal PDSCH that transmits the second part of the extended PDSCH, as shown in FIG. The subframe to be transmitted or the shortened PDSCH can be transmitted in the next subframe of the subframe to be transmitted. The DCI is an end indicator (ie, end subframe boundary field) indicating whether the end time of the first PDSCH is the start boundary or the end boundary of the subframe transmitting the DCI, and a length indicating the length of the first PDSCH. Indicators can be included.

In particular, with respect to the end subframe boundary field in DCI, one bit can be used to indicate the end time (eg end subframe boundary) for, for example, a subframe for sending DCI on the PDCCH. .. For example, "0" indicates that the PDSCH ends at the start boundary of the subframe sending the DCI (the first subframe boundary in FIG. 8), and "1" indicates the end boundary of the subframe sending the DCI (FIG. 8). Indicates that the PDSCH ends at the second subframe boundary).

For example, with respect to the length indicator for indicating the length of the head PDSCH in units of OFDM symbols, for example, 5 bits can be used to indicate the PDSCH length from 1 to 28 OFDM symbols. Alternatively, use a reduced number of bits in relation to a reduced set of possible starting positions to reduce the signal transduction overhead as well as improve the robustness of the DCI by reducing the code rate. can do. For example, if the DCI is transmitted in subframes as shown in FIG. 8, the length of the PDSCH is if the PDSCH ends at the start boundary of the subframe sending the DCI (the first subframe boundary in FIG. 8). It can be only 1 to 13 symbols (shortened PDSCH), and if the PDSCH ends at the end boundary of the subframe sending the DCI (the second subframe boundary in FIG. 8), the PDSCH length is 14 to 28 symbols. Can only be (normal PDSCH or extended PDSCH). In this case, a 4-bit indicator can be used to indicate the length of 1 to 13 OFDM symbols or 14 to 28 OFDM symbols, and the duration can be determined by the length indicator in relation to the end indicator.

The above method may be applied similarly to OFDM symbols with extended CP. According to this embodiment, since the time for CCA to succeed is unpredictable, it may be necessary to buffer PDSCHs of different lengths in the eNB, and the UE will set the previous subframe for the first PDSCH. You may need to buffer one.

(Fourth Embodiment)
Due to regulatory constraints on maximum burst length (eg maximum burst length <4ms in Japan) and / or flexible burst start time, it is a flexible burst end time to take advantage of the maximum burst length allowed by local regulations. Will be connected. When the final PDSCH of a burst ends in the middle of a subframe, the shortened PDSCH in DwPTS can be used directly for flexible end times at the granularity of OFDM symbols. Alternatively, the shortened PDSCH and the previous normal PDSCH can be scheduled together as an extended PDSCH by one DCI to one (group) UE. The enhanced PDSCH or shortened PDSCH is considered the flexible final PDSCH of the burst.

The bits of the extended PDSCH can be as follows. That is,
1. 1. The separately encoded transport blocks, that is, the bits in the shortened PDSCH portion of the last subframe and the bits in the normal PDSCH portion of the penultimate subframe, are encoded separately. For the shortened PDSCH portion, use the same PDSCH mapping, RS mapping, and TBS determination from the unshifted shifted DwPTS as used in the first embodiment to minimize the impact on the specifications. Can be done.

2. 2. The jointly encoded transport block, that is, the bits in the shortened PDSCH portion of the last subframe and the bits in the normal PDSCH portion of the penultimate subframe, are encoded and mapped as one extended PDSCH. .. In this case, the RS mapping specified in 3GPP36.211 is reused and a new TBS determination, for example,

It is possible to define a, _{N PRB} in the above formula is an index of the column in TBS table in 3GPP 36.213, N _'PRB is the total number of PRB allocated, beta data in the target PDSCH RE A coefficient derived from the number of (eg, β can be derived by dividing the number of data REs in the target PDSCH by the average number of data RESs in the existing PDSCH, plus for different PDSCH lengths. Different βs may be used, or common βs may be used for multiple PDSCH lengths, for example by averaging individual βs).

3. 3. TTI bundling, i.e., the bits in the shortened PDSCH portion of the last subframe and the bits in the normal PDSCH portion of the penultimate subframe are in the same / different RV (redont version) of the same encoded bit in the transport block. Yes, and at the same time, the shortened PDSCH portion is truncated based on the OFDM symbol used. In this case, it is possible to reuse the RS mapping specified in 3GPP 36.211 and the TBS specified in 3GPP 36.213.

FIG. 9 schematically illustrates an exemplary time series diagram for licensed and unlicensed carriers according to a fourth embodiment of the present disclosure. As shown in FIG. 9, in the unlicensed band, the final PDSCH of the burst is an extended PDSCH that includes a normal PDSCH portion and a shortened PDSCH portion. The DCI will be sent in the licensed band PDCCH / EPDCCH to indicate the duration of the final PDSCH of the burst in the unlicensed carrier. The DCI for the burst's flexible final PDSCH (the burst's final PDSCH as a flexible PDSCH) includes a length indicator indicating the length of the final PDSCH, where the length begins, for example, at the start boundary of the subframe transmitting the DCI. .. The DCI can optionally include a start indicator indicating the start time of the final PDSCH. However, since the start boundary of the final PDSCH can be fixed to the start boundary of the subframe sending the DCI, as shown in FIG. 9, the UE can know the start of the final PDSCH and therefore omit the start indicator. can do. For example, with respect to a length indicator for indicating the length of the leading PDSCH in units of OFDM symbols, for example, 4 bits can be used to indicate the PDSCH length from 15 to 28 OFDM symbols. Alternatively, a reduced number of bits (eg, a reduced number of bits (eg,) in relation to a reduced set of possible starting positions to reduce the signal transduction overhead as well as improve the robustness of the DCI by reducing the coding rate. A 2-bit indicator for the length of the 15/20/23/28 OFDM symbol, or a 1-bit indicator for the length of the 15/20 OFDM symbol) can be used.

The above method may be applied similarly to OFDM symbols with extended CP. In addition, if the final PDSCH of the burst uses the shortened PDSCH directly without adopting the extended PDSCH, a similar DCI can be used to indicate the duration of the final shortened PDSCH, the only difference being the length relative to the shortened PDSCH. The indicator indicates the length of 1 to 13 symbols in the case of normal CP. In addition, DCI for shortened DCI can be used similarly for normal PDSCH by showing a length of 14 in the case of normal CP.

(Fifth Embodiment)
In a fifth embodiment, the choice between the shortened PDSCH and the extended PDSCH for the final PDSCH of the burst may depend on the scheduling strategy in the eNB. Also, the same DCI format can be used for shortened and extended PDSCHs as well as optionally normal PDSCHs.

Scheduling strategies in eNB will consider one or more of the following features: That is,

1. 1. UE capability:
◆ If the UE does not support extended PDSCH, the extended PDSCH will not be scheduled for this UE ◆ If the UE does not support shortened PDSCH, the shortened PDSCH will not be scheduled for this UE ◆ UE is normal If only free PDSCH is supported, the shortened / extended PDSCH will not be scheduled for this UE, that is, the UE will be scheduled only in the middle of the burst.

2. 2. Unlicensed channel conditions:
◆ If the shortened PDSCH contains too few OFDM symbols or does not contain RS, the extended PDSCH will preferably be scheduled.

3. 3. Licensed control overhead:
◆ When the load on the licensed band PDCCH / EPDCCH is high, the extended PDSCH, which requires less scheduling overhead, is preferable.

4. Certain preferences for eNB ◆ For example, predetermined preferences for eNB

The DCI will be sent in the licensed band PDCCH / EPDCCH to indicate the duration of the final PDSCH of the burst in the unlicensed carrier. For example, FIG. 10 schematically illustrates an exemplary time series diagram for licensed and unlicensed carriers according to a fifth embodiment of the present disclosure. As shown in FIG. 10, two possible flexible final PDSCHs in the unlicensed band are illustrated, the upper one being the extended subframe and the lower one being the shortened subframe. To uniformly indicate the duration of the two types of PDSCH in one DCI format, the DCI for the final PDSCH can be transmitted in subframes where the final PDSCH begins to be transmitted, as shown in FIG. The DCI may include at least a length indicator indicating the length of the final PDSCH and optionally include a start indicator indicating the start time of the final PDSCH. In a fifth embodiment, the start boundary of the final PDSCH can be fixed to the start boundary of the subframe sending the DCI, as shown in FIG. 10, so that the UE can know the start of the final PDSCH. Therefore, the start indicator can be omitted. For example, with respect to the length indicator for indicating the length of the head PDSCH in units of OFDM symbols, for example, 5 bits can be used to indicate the PDSCH length from 1 to 28 OFDM symbols. Alternatively, a reduced number of bits (eg, a reduced number of bits (eg,) in relation to a reduced set of possible starting positions to reduce the signaling overhead as well as to improve the robustness of the DCI by reducing the coding rate. 9/11/14 / (14 + 6) 2-bit indicator for length of OFDM symbol) can be used.

It should be noted that the above method may be applied similarly to OFDM symbols with extended CP.

(Sixth Embodiment)
Based on the third embodiment, whether the shortened PDSCH or the extended PDSCH is scheduled for the head PDSCH of the burst is selected according to the scheduling strategy in the eNB, and one DCI. Both types of PDSCH can be indicated using a format. In a fifth embodiment, the choice between the shortened PDSCH and the extended PDSCH for the final PDSCH of the burst can similarly depend on the scheduling strategy in the eNB, and both types of PDSCH are similarly one DCI. Can be indicated in format. In a sixth embodiment, one DCI format can be used to indicate both the leading and final PDSCH for both the shortened PDSCH and the extended PDSCH. Here, the following cases are possible. That is, 1) shortened PDSCH at the beginning of the burst and shortened PDSCH at the end of the burst, 2) shortened PDSCH at the beginning of the burst and extended PDSCH at the end of the burst, and 3) extended PDSCH and burst at the beginning of the burst. The shortened PDSCH at the end, and 4) the extended PDSCH at the beginning of the burst and the extended PDSCH at the end of the burst. It should be noted that, as a special case, the first and last PDSCHs can be similarly normal PDSCHs, which are also optionally indicated by the DCI defined in the sixth embodiment. Whether the eNB uses the normal DCI for the normal PDSCH or the DCI specified in the present disclosure can be specified or set.

FIG. 11 schematically illustrates an exemplary time series for licensed and unlicensed carriers according to a sixth embodiment of the present disclosure. As shown in FIG. 11, three possible leading PDSCHs and three possible final PDSCHs in the unlicensed band are illustrated, the first row PDSCH is a shortened PDSCH as the leading PDSCH, and the second row PDSCH. Is an extended PDSCH as the first PDSCH, the third row PDSCH is the normal PDSCH as the first PDSCH, the fourth row PDSCH is the shortened PDSCH as the final PDSCH, and the fifth row PDSCH is the final PDSCH. The PDSCH in the sixth column is a normal PDSCH as the final PDSCH. The DCI for scheduling each of these PDSCHs is a subframe that transmits the second part of the extended PDSCH, a subframe that transmits the normal PDSCH, or a subframe that transmits the shortened PDSCH, when the PDSCH is the first PDSCH. It can be transmitted in the next subframe, and if the PDSCH is the final PDSCH, it can be transmitted in the subframe where the PDSCH starts to be transmitted.

In order to uniformly indicate the duration of all these types of PDSCHs in one DCI format, the DCI has a length indicator indicating the length of the PDSCH and the end time of the PDSCH at the start boundary of the subframe transmitting the DCI. Includes a start-end indicator indicating that the end time of the PDSCH is the end boundary of the subframe transmitting the DCI, or that the start time of the PDSCH is the start boundary of the subframe transmitting the DCI. Can be done. In addition, since the DCI for the first PDSCH indicates the end time and the DCI for the last PDSCH indicates the start time, the start-end indicator can similarly imply whether the PDSCH is the first PDSCH or the last PDSCH.

Specifically, with respect to the start-end indicator, for example, two bits can be used to indicate a start or end subframe boundary for, for example, a subframe sending DCI (PDCCH / EPDCCH). For example, "00" can be used to indicate a PDSCH ending at the start boundary of the subframe sending DCI (the first subframe boundary in FIG. 11), and "01" can be used to indicate the subframe sending DCI. A PDSCH that ends at the end subframe boundary of the frame (the second subframe boundary in FIG. 11) can be shown, and "10" can be used to indicate the start boundary of the subframe that sends the DCI (the first sub in FIG. 11). A PDSCH starting with (frame boundary) can be shown.

For example, with respect to the length indicator for indicating the length of the PDSCH in units of OFDM symbols, for example, 5 bits can be used to indicate the PDSCH length from 1 to 28 OFDM symbols. Alternatively, a reduced number of bits (eg, a reduced number of bits) in relation to a reduced set of possible starting positions to reduce the signal transduction overhead as well as improve the robustness of the DCI by reducing the coding rate. 6/9/10/11/12/14 / (14 + 3) / (14 + 6) 3-bit indicator for the length of the OFDM symbol) can be used.

It should be noted that the above method may be applied similarly to OFDM symbols with extended CP.

(7th Embodiment)
In a seventh embodiment, the eNB starts with the first available OFDM symbol after the second carrier is occupied by the eNB and has a fixed length, especially the length of the normal PDSCH, at the beginning of the burst PDSCH. Can be sent. In other words, in the seventh embodiment, the head PDSCH of the burst is a normal length PDSCH with a shifted start symbol. After a successful CCA in the unlicensed band, the eNB begins with the first OFDM symbol available for data transmission (if a reserved signal such as a preamble, RTS / CTS or PSS / SSS is sent after the CCA ends). Send data in PDSCH ending with an OFDM symbol based on a fixed number of OFDM symbols. If there is no PDCCH area in the unlicensed band in the normal CP, the normal PDSCH consists of 14 OFDM symbols. The start symbol of the first PDSCH is from the 1st to the 14th depending on the CCA end time, while the end time of the PDSH is from the 14th to the 1st if the PDSCH length maintains the 14 OFDM symbol. In a seventh embodiment, the beginning PDSCH of the burst begins and ends at a flexible time in units of OFDM symbol boundaries based on the end of the CCA.

FIG. 12 schematically illustrates an exemplary time series diagram for licensed and unlicensed carriers according to a seventh embodiment of the present disclosure. As shown in FIG. 12, the eNB transmits the first PDSCH of the burst starting from the first available OFDM symbol after the second carrier is occupied by the eNB, and the first PDSCH is of one normal PDSCH. Has a fixed length. A normal length PDSCH with a shifted start symbol (also called a flexible PDSCH) can reuse the structure of the current normal PDSCH, for example by a global shift or a circular shift. The overall shift shifts the normal PDSCH to the flexible PDSCH so that the start of the normal PDSCH is shifted to the start of the flexible PDSCH and the end of the normal PDSCH is shifted to the end of the flexible PDSCH. Means to be shifted. The cyclic shift is such that the front of the flexible PDSCH is normal, as shown in FIG. 13, which schematically illustrates an exemplary time series diagram for explaining the cyclic shift of the PDSCH according to the seventh embodiment of the present disclosure. It is derived from the rear part of the PDSCH, which means that the rear part of the flexible PDSCH is derived from the front part of the normal PDSCH.

The DCI will be sent in the licensed band PDCCH / EPDCCH to indicate the duration of the flexible first PDSCH of the burst in the unlicensed carrier. The DCI can be sent after the unlicensed channel is occupied by the eNB or before the unlicensed channel is occupied by the eNB. For example, the DCI can be sent in the next subframe of the subframe that starts transmitting the first PDSCH. In the embodiment of FIG. 12, the DCI is sent in a subframe that sends the second part. The DCI for the head PDSCH includes an offset length indicator indicating the offset length of the start time of the head PDSCH with respect to the reference boundary, and a reference boundary indicator indicating whether the reference boundary is the start time or the end time of the subframe transmitting the DCI. including.

Specifically, with respect to the reference boundary indicator, for example, one bit can be used to indicate the reference boundary for a subframe sending DCI, for example (in PDCCH / EPDCCH). For example, "0" can be used to indicate that the reference boundary is the starting boundary of the subframe sending the DCI (the first subframe boundary in FIG. 12), while "1" is used. It can be shown that the reference boundary is the end boundary of the subframe sending the DCI (the second subframe boundary in FIG. 12).

For the offset length indicator, 4 bits can be used to indicate the PDSCH offset from 0 to 13 OFDM symbols before the reference boundary (“0” means that there is no offset and the leading PDSCH is a normal PDSCH. To do). A reduced number of bits (eg 0 /) in relation to a reduced set of possible start positions to reduce the signal transduction overhead as well as improve the robustness of the DCI by reducing the coding rate. A 2-bit indicator) can be used for the length of the 6/9/12 OFDM symbol.

With reference back to FIG. 12, for the second PDSCH of the burst, a shortened PDSCH can be adopted to align with the subsequent subframe boundaries. The shortened second PDSCH can be scheduled together with or independently of the first PDSCH or third PDSCH. If the shortened PDSCH is scheduled independently, the PDSCH & RS mapping and TBS determination methods of the first embodiment can be used. If the shortened PDSCH is scheduled as one extended PDSCH together with the first PDSCH or the third PDSCH, the PDSCH & RS mapping and TBS determination methods of the second embodiment can be used. It is noted that the second PDSCH of the burst and, in some cases, subsequent PDSCHs may employ fixed length shifted PDSCHs as well. In this case, the scheduling method of the second PDSCH is the same as that of the fixed-length shifted leading PDSCH.

In addition, as another embodiment of the seventh embodiment, the head PDSCH is not necessarily a fixed length PDSCH, but also a PDSCH ending at the end boundary of the subframe starting the head PDSCH (eg, shortened PDSCH) or head PDSCH. Can be a PDSCH end indicator to an indicator that has a fixed length, or a PDSCH (extended PDSCH) that ends at the end boundary of the next subframe of the subframe that starts the first PDSCH. FIG. 14 schematically illustrates an exemplary time series of licensed and unlicensed carriers according to this embodiment of a seventh embodiment of the present disclosure. FIG. 14 illustrates three possible leading PDSCHs in an unlicensed band. The upper PDSCH is a PDSCH with a fixed length of one normal PDSCH, the central PDSCH is an extended PDSCH, and the bottom PDSCH is a shortened PDSCH. To uniformly indicate the duration of these leading PDSCHs, the DCI includes a PDSCH end indicator in addition to the offset length indicator and reference boundary indicator described above. The PDSCH end indicator indicates that the leading PDSCH has a fixed length, that the leading PDSCH is a shortened PDSCH, or that the leading PDSCH is an extended PDSCH. For example, using a 2-bit indicator to give such an instruction, for example, "00" for a fixed length PDSCH, "01" for a shortened PDSCH, "10" for an extended PDSCH, and so on. Can be done. When the leading PDSCH is a shortened PDSCH, the offset length indicator indicates the length of the shortened PDSCH and the reference boundary indicator indicates the end time of the shortened PDSCH. When the first PDSCH is an extended PDSCH, the offset length indicator indicates the length of the extended PDSCH minus one normal PDSCH length, and the reference boundary indicator indicates the end time of the first part (shortened PDSCH part) of the extended PDSCH. Shown. The DCI defined for this embodiment can also be used for a normal PDSCH, for example by setting the offset length to 0 for a PDSCH with a fixed length of one normal PDSCH length. However, it is noted.

Similarly, the above method may be similarly applied to OFDM symbols with extended CP.

The present invention may be realized by software, hardware, or software linked with hardware. Each functional block used in the description of each of the above embodiments can be realized by an LSI as an integrated circuit. They may be formed individually as chips, or one chip may be formed to include some or all of the functional blocks. The LSI in this case can be called an IC, a system LSI, a super LSI, or an ultra LSI depending on the difference in the degree of integration. However, the technique for implementing an integrated circuit is not limited to LSI, and can be realized by using a dedicated circuit or a general-purpose processor. In addition, an FPGA (Field Programmable Gate Array) that can be programmed after the LSI is manufactured, or a reconfigurable processor that can reconfigure the connections and settings of circuit cells located inside the LSI may be used. .. Further, the calculation of each functional block can be performed by using a computing means, including, for example, a DSP or CPU, and the processing steps of each function are recorded on a recording medium as a program for execution. May be good. Moreover, when advances in semiconductor technology or other derivative technologies have led to the emergence of technologies for implementing integrated circuits to replace LSIs, it is clear that functional blocks can be integrated by using such technologies.

The present invention is intended to be variously modified or modified by one of ordinary skill in the art based on the description and well-known techniques presented herein without departing from the spirit and scope of the invention, such modifications and applications. It should be noted that it is included in the claims to be protected. Moreover, the components of the above-described embodiments can be arbitrarily combined without departing from the spirit of the present invention.

Claims (16)

A receiver that receives scheduling information in the first half of subframes in one or two consecutive subframes and receives downlink data mapped to OFDM symbols in the one or two consecutive subframes.
A control unit that identifies the OFDM symbol group based on the scheduling information is provided.
The number of symbols of the OFDM symbol group is one of the one or two consecutive subset of the number by the number of symbols can take OFDM symbol group remote fewer elements in a sub-frame is selected,
Communication device. The end position of the OFDM symbol group is set to a variable position different from the subframe boundary.
The communication device according to claim 1. The end position of the OFDM symbol group is shifted from the subframe boundary in units of OFDM symbols.
The communication device according to claim 1. The subset contains 6,9,10,11,12,14 symbol numbers.
The communication device according to any one of claims 1 to 3. The scheduling information is arranged in a 4-bit field in DCI format, and the value of the 4-bit field indicates the number of OFDM symbols contained in the OFDM symbol group in the one or two consecutive subframes. ,
The communication device according to any one of claims 1 to 4. The end position of the OFDM symbol group coincides with the end position of the downlink pilot time slot (DwPTS) in one subframe of the one or two consecutive subframes.
The communication device according to any one of claims 1 to 5. The starting position of the OFDM symbols in the first half of the subframe for transmitting downlink data is set to a variable position different from the subframe boundary.
The communication device according to any one of claims 1 to 3. Scheduling information is received in the first half of the subframe in one or two consecutive subframes,
Receiving the mapped downlink data before Symbol one or two consecutive OFDM symbol group in the sub-frame,
Identifying the OFDM symbol group on the basis of the scheduling information,
The number of symbols of the OFDM symbol group is one of the one or two consecutive subset of the number by the number of symbols can take OFDM symbol group remote fewer elements in a sub-frame is selected,
Communication method . The end position of the OFDM symbol group is set to a variable position different from the subframe boundary.
The communication method according to claim 8. The end position of the OFDM symbol group is shifted from the subframe boundary in units of OFDM symbols.
The communication method according to claim 8. The subset contains 6,9,10,11,12,14 symbol numbers.
The communication method according to any one of claims 8 to 10. The scheduling information is arranged in a 4-bit field in DCI format, and the value of the 4-bit field indicates the number of OFDM symbols contained in the OFDM symbol group in the one or two consecutive subframes. ,
The communication method according to any one of claims 8 to 11. The end position of the OFDM symbol group coincides with the end position of the downlink pilot time slot (DwPTS) in one subframe of the one or two consecutive subframes.
The communication method according to any one of claims 8 to 12. The starting position of the OFDM symbols in the first half of the subframe for transmitting downlink data is set to a variable position different from the subframe boundary.
The communication method according to any one of claims 8 to 11. The process of receiving scheduling information in the first half of the one or two consecutive subframes and receiving the downlink data mapped to the OFDM symbol group in the one or two consecutive subframes.
Controlling the process of identifying the OFDM symbol group based on the scheduling information,
The number of symbols of the OFDM symbol group is one of the one or two consecutive subset of the number by the number of symbols can take OFDM symbol group remote fewer elements in a sub-frame is selected,
Integrated circuit. The subset contains 6,9,10,11,12,14 symbol numbers.
The integrated circuit according to claim 15.

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