JP7121094B2 - Communication device, communication method, and integrated circuit - Google Patents

Description

TECHNICAL FIELD The present disclosure relates to communication devices, communication methods, and integrated circuits in the field of wireless communications.

The rapid growth of mobile data is forcing operators to make increasingly efficient use of the finite frequency spectrum, while WiFi, Bluetooth, etc. alone make inefficient use of a lot of unlicensed spectrum. . LTE-U (LTE-unlicensed) can extend the LTE spectrum into unlicensed bands, which will directly and dramatically increase network capacity. LTE-U together with LAA (Licensed Assisted Access), especially for large users, for example, highly reliable CCH (Control CHannel), LA (Link Adaptation), HARQ, ICIC (Inter Cell Interference Coordination), interference cancellation, etc. It has higher spectral efficiency than WiFi. LTE-U can successfully coexist with existing RATs through mechanisms such as LBT (Listen Before Talk), DFS (Dynamic Frequency Selection), and TPC (Transmit Power Control). Network architecture will be simpler and more unified.

In a first embodiment of the present disclosure, a resource scheduling method for wireless communications conducted by an eNode B (eNB) is provided, the wireless communications involving at least a first carrier and a second carrier, the method comprising: , transmitting downlink control information (DCI) on a first carrier to a user equipment (UE) to schedule downlink resources for a physical downlink shared channel (PDSCH) on a second carrier; may 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, and normal The DCI for the flexible PDSCH in bursts different from the PDSCH contains information about the duration scheduled for the flexible PDSCH.

In a second embodiment of the present disclosure, a resource determination method for wireless communications conducted by a user equipment (UE) is provided, the wireless communications involving at least a first carrier and a second carrier, the method comprising: , receiving downlink control information (DCI) transmitted on a first carrier by an eNode B (eNB) to determine downlink resources for a physical downlink shared channel (PDSCH) on a second carrier; including, the UE may receive bursts on the second carrier initiated by the eNB at flexible times independent of subframe boundaries of the second carrier after the second carrier is occupied by the eNB. , the DCI for the flexible PDSCH of a different burst than the normal PDSCH of the second carrier contains information about the duration scheduled for the flexible PDSCH.

In a third embodiment of the present disclosure, an eNode B (eNB) is provided for resource scheduling of wireless communications, the wireless communications involving at least a first carrier and a second carrier, the eNB comprising user equipment ( a transmission unit configured to transmit downlink control information (DCI) on a first carrier to schedule downlink resources for a physical downlink shared channel (PDSCH) on a second carrier to the UE). , the eNB may begin transmitting bursts on the second carrier at flexible times independent of subframe boundaries of the second carrier after the second carrier is occupied by the eNB, and The DCI for the flexible PDSCH in bursts different from the normal PDSCH contains information about the scheduled period for the flexible PDSCH.

In a fourth embodiment of the present disclosure, a user equipment (UE) for resource determination of wireless communication is provided, the wireless communication involves at least a first carrier and a second carrier, a method comprising: eNode B ( a receiving unit for receiving downlink control information (DCI) transmitted on a first carrier by an eNB) to determine downlink resources for a physical downlink shared channel (PDSCH) on a second carrier; can receive bursts on the second carrier initiated by the eNB at flexible times independent of subframe boundaries of the second carrier after the second carrier is occupied by the eNB; The DCI for the flexible PDSCH of a different burst than the normal PDSCH of one carrier contains information about the duration scheduled for the flexible PDSCH.

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

The foregoing and other features of the present disclosure will become more fully apparent from the following description and appended claims, taken in conjunction with the accompanying drawings. The disclosure is understood through the use of the accompanying drawings, with the understanding that these drawings depict only some embodiments in accordance with the disclosure and are therefore not to be considered limiting of the scope of the disclosure. More specifically and in detail will be described.

4 illustrates a flow chart of a resource scheduling method for wireless communication according to an embodiment of the present disclosure; Fig. 4 is a diagram schematically illustrating shifting of a shortened PDSCH using the DwPTS subframe structure; 1 illustrates a block diagram of an eNB according to an embodiment of the present disclosure; FIG. 4 illustrates a flow chart of a resource determination method for wireless communication according to an embodiment of the present disclosure; 1 illustrates a block diagram of a UE according to embodiments of the present disclosure; FIG. 1 schematically illustrates an example timeline diagram for a licensed carrier and an unlicensed carrier according to the first embodiment of the present disclosure; 1 schematically illustrates an example timeline diagram for licensed carriers and unlicensed carriers according to the second embodiment of the present disclosure; 3 schematically illustrates an example timeline diagram for licensed carriers and unlicensed carriers according to a third embodiment of the present disclosure; 4 schematically illustrates an example timeline diagram for a licensed carrier and an unlicensed carrier according to the fourth embodiment of the present disclosure; 5 schematically illustrates an example timeline diagram for a licensed carrier and an unlicensed carrier according to the fifth embodiment of the present disclosure; 6 schematically illustrates an example timeline diagram for a licensed carrier and an unlicensed carrier according to the sixth embodiment of the present disclosure; 3 schematically illustrates an example timeline diagram for a licensed carrier and an unlicensed carrier according to the seventh embodiment of the present disclosure; FIG. 3 schematically illustrates an example time sequence diagram for explaining the cyclic shift of PDSCH according to the seventh embodiment of the present disclosure; FIG. FIG. 12 schematically illustrates an example timeline diagram for a licensed carrier and an unlicensed carrier according to another example of the seventh embodiment of the present disclosure; FIG.

DETAILED DESCRIPTION The following detailed description refers to the accompanying drawings, which form a part of the description. In the drawings, similar symbols typically identify similar components, unless context dictates otherwise. It will be readily understood that the embodiments of the present disclosure can be arranged, substituted, combined and designed in a wide variety of different configurations, all of which are expressly contemplated and form part of the present disclosure. would be

How to schedule unlicensed carrier resources by eNB is an important issue that needs to be solved in LAA. The LTE carrier aggregation architecture (licensed PCell and unlicensed SCell) is the basic premise. Cross-carrier scheduling with licensed bands is a common mechanism in carrier aggregation to grant resources on unlicensed carriers with reliable control signaling on licensed carriers. Aligned subframes between licensed and unlicensed carriers can reuse current scheduling mechanisms in LTE carrier aggregation. In currently existing cross-carrier scheduling mechanisms, control and data are sent in the same subframe times, but on different carriers. The eNB can only access the unlicensed channel at a fixed point in time (e.g. PDSCH boundary or subframe boundary), while other nodes such as Wi-Fi immediately after a successful Clear Channel Assessment (CCA). can access the channel. In this sense, LAA's access priority will be de-prioritized compared to Wi-Fi.

In this disclosure, a mechanism is provided to flexibly schedule burst start times on unlicensed carriers (also called unlicensed bands). In other words, the eNB may start transmitting bursts on the unlicensed carrier at flexible times independent of subframe boundaries after the unlicensed carrier is occupied by the eNB (e.g., after successful CCA). can. In particular, the start time of PDSCH in bursts can be flexibly scheduled. By scheduling burst or PDSCH start times flexibly, the eNB may occupy unlicensed carriers at any instant independent of subframe boundaries, immediately after successful CCA.

Although embodiments of the present disclosure may be described in the context of licensed and unlicensed bands, the disclosure is not so limited and the present disclosure refers to a first carrier (e.g., licensed carrier) and a second carrier (e.g., unlicensed carrier). It is noted that it may apply to any wireless communication involving two different carriers, called licensed carriers.

According to the present disclosure, resource scheduling methods for wireless communications conducted by an eNB are provided. Wireless communication involves at least a first carrier (eg, licensed carrier) and a second carrier (eg, unlicensed carrier). A flowchart of a resource scheduling method is illustrated in FIG. 1 as method 100 . The method 100 includes a step 101 of sending DCI on a first carrier to a UE to schedule downlink resources for the PDSCH on a second carrier, and the eNB after the second carrier is occupied by the eNB. , can start transmitting bursts on the second carrier at flexible times independent of subframe boundaries on the second carrier, and the DCI for the flexible PDSCH of the bursts different from the normal PDSCH on the second carrier is flexible It contains information about the scheduled period for each PDSCH. Preferably, the subframes of the second carrier are aligned with the subframes of the first carrier, which can reuse the current scheduling mechanism in LTE carrier aggregation. It is noted that normal PDSCH in this case means PDSCH with fixed boundaries 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. If 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 flexible PDSCH start time and/or end time are shifted from the respective boundaries of the normal PDSCH. The flexible PDSCH length can be shorter or longer than the normal PDSCH.

According to method 100, the eNB can initiate bursts on the second carrier at flexible times 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, but can be changed as needed. For example, the eNB may start sending signals immediately after a successful CCA. The signal can be a reserved signal such as RTS/CTS (Request To Send/Clear To Send) or other signals followed by PDSCH, or PDSCH only. When transmitting the PDSCH, the granularity can be one OFDM symbol. In other words, the flexible start time of the leading PDSCH in a burst can be the first available OFDM symbol after the successful CCA end time. Thus, the eNB may occupy the second carrier at any instant independent of the subframe boundary, immediately after successful CCA.

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

According to this disclosure, 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 DCI can be sent on the It can also be sent on the (E)PDCCH of the first carrier before being occupied by the eNB. Additionally, DCI can be sent in the same or different subframes as the subframes in which the PDSCH is sent, and can be sent before or after the PDSCH is sent in the same subframe (where the terms "before" or "after" are used). means the start of transmission is "before" or "after"). For example, if EPDCCH is used on the first carrier to send DCI, the PDSCH on the second carrier can start sending before the start of EDPCCH in the same subframe. Alternatively, specifically, DCI can be sent in the subframe following the subframe that initiates PDSCH transmission.

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

An eNB for resource scheduling of wireless communication is also provided in this disclosure. Wireless communication involves at least a first carrier and a second carrier. FIG. 3 schematically illustrates a block diagram of such an eNB 300. As shown in FIG. The eNB 300 includes a transmitting unit 301 configured to transmit DCI on a first carrier to a UE to schedule downlink resources for the PDSCH on a second carrier, the eNB 300 is configured to transmit DCI on a first carrier to a UE and schedule downlink resources for the PDSCH on a second carrier; bursts can be started on the second carrier at flexible times independent of subframe boundaries of the second carrier after being occupied by the flexible PDSCH with bursts different from the normal PDSCH on the second carrier. The DCI for the flexible PDSCH contains information about the duration scheduled for the flexible PDSCH.

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

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

Accordingly, on the UE side, the present disclosure provides a resource determination method for wireless communications conducted by the UE. Wireless communication involves at least a first carrier and a second carrier. FIG. 4 illustrates a flowchart of resource determination method 400 . Method 400 includes step 401 of receiving DCI transmitted by an eNB on a first carrier to determine downlink resources for the PDSCH on a second carrier, wherein the UE is notified that the second carrier is occupied by the eNB. , a burst on the second carrier initiated by the eNB at a time independent of the subframe boundary of the second carrier can be received, with DCI for at least the first PDSCH of the burst and/or the last PDSCH of the burst. The DCI for each PDSCH contains information about the scheduled period for each PDSCH. It is noted that the above details described on the eNB side are equally applicable on the UE side and they will be repeated here.

Additionally, the present disclosure also provides a UE for resource determination for wireless communication. Wireless communication involves at least a first carrier and a second carrier. FIG. 5 schematically illustrates a block diagram of such a UE 500. As shown in FIG. UE 500 includes a receiving unit 501 configured to receive DCI transmitted on a first carrier by an eNB to determine downlink resources for PDSCH on a second carrier, After the carrier is occupied by the eNB, bursts on the second carrier initiated by the eNB can be received at flexible times independent of subframe boundaries of the second carrier, and normal normal The DCI for the flexible PDSCH in bursts different from the PDSCH contains information about the duration scheduled for the flexible PDSCH.

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

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

The present disclosure will be described in detail below by way of embodiments.

(First embodiment)
In a first embodiment, the eNB starts at the first available OFDM symbol after the second carrier is occupied by the eNB (e.g. after a successful CCA) and at the end boundary of the subframe where the leading PDSCH begins. At the end of the burst, the PDSCH at the beginning of the burst can be transmitted. For example, after successful CCA on an unlicensed band, the eNB sends data on PDSCH starting from the first OFDM symbol available for data transmission and ending at the ending boundary of the current subframe. Reserved signals such as preamble, PSS/SSS (Primary Synchronization Signal/Secondary Synchronization Signal) or RTS/CTS can be sent before the leading PDSCH after CCA termination, so that the first available OFDM symbol is the first after CCA termination. Note that it does not have to be the OFDM symbol of . The leading PDSCH of a burst in the first embodiment can be a shortened PDSCH or a normal PDSCH.

FIG. 6 schematically illustrates an example timeline diagram for a licensed carrier and an unlicensed carrier according to the first embodiment of the present disclosure; As shown in FIG. 6, in the unlicensed band, data on the leading PDSCH (which is the shortened PDSCH in FIG. 6) can be sent by starting from the first symbol boundary after the CCA, optionally A reservation signal can be sent before the PDSCH. When sending a reserved signal before the initial PDSCH, the initial PDSCH can start from a subsequent symbol other than the first symbol, and since the symbol before the subsequent symbol is not available for the PDSCH, the subsequent can also be called the first available symbol. The end of the leading PDSCH is the end boundary of the current subframe, ie the first subframe boundary shown in FIG.

If there is no PDCCH region in the unlicensed band in the normal CP (Cyclic Prefix), the normal PDSCH consists of 14 OFDM symbols. The starting symbol for the flexible-started PDSCH (eg, the first PDSCH of the burst in this embodiment) can be the 1st to 14th symbols depending on the CCA end time, thus for the flexible-started PDSCH. The number of OFDM symbols is from 14 to 1. If the number of OFDM symbols is less than 14, the PDSCH is called shortened PDSCH. If the length of the leading PDSCH is 14 symbols, the leading PDSCH is a normal PDSCH.

The shortened PDSCH and corresponding RS (Reference Signal) will reuse the DwPTS subframe structure to minimize the impact on the specification. The shortened PDSCH using the DwPTS subframe structure is globally shifted to start with the OFDM symbol scheduled by the eNB, as shown in FIG. Only lengths of 6/9/10/11/12 symbols are specified for PDSCH with normal CP in the current DwPTS, 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 6/9/10/11/12 OFDM symbol length Reuse current TBS decision for PDSCH in DwPTS specified in 3GPP 36.213 RS specified in 3GPP 36.211 (e.g. CRS/DMRS) mapping reuse

- For 13/14 OFDM symbol length Reuse current TBS decisions for PDSCH in normal subframes specified in 3GPP 36.213 RSs specified in 3GPP 36.211 (e.g. CRS/DMRS) Reuse mapping

For 1/2/3/4/5/7/8 OFDM symbol length TBS decision Candidate-1: new TBS decision, eg,

where N _PRB is the column index of the TBS table in 3GPP 36.213, N′ _PRB is the total number of allocated PRBs, and β is derived from the number of data REs in the target PDSCH. (e.g., β can be derived through dividing the number of data REs in the target PDSCH by the average number of data RESs in the existing PDSCH, in addition using different β for different PDSCH lengths. or a common β may be used for multiple PDSCH lengths, e.g. by averaging the individual βs)
Candidate-2: TBS decision for DwPTS containing 6 OFDM symbols as specified in 3GPP 36.213 for lengths of 4/5/7/8 OFDM symbols, e.g.

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

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

DCI will be sent on the PDCCH/EPDCCH of the licensed band to indicate the duration of the first PDSCH of the burst on the unlicensed carrier. DCI may be sent after an unlicensed channel is occupied by an eNB or before an unlicensed channel is occupied by an eNB. For example, DCI can be sent in the subframe in which the leading PDSCH is sent or in the next subframe. In the example of FIG. 6, DCI is sent in the next subframe. As an example, the DCI for the starting PDSCH includes an end indicator (i.e., ending subframe boundary field) and a starting PDSCH indicating whether the end time of the starting PDSCH is the start or end boundary of the subframe in which the DCI is transmitted. contains a length indicator that indicates the length of the 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. For the case where the leading PDSCH is the normal PDSCH, the normal DCI may be used, or the DCI defined above may be used as well. The DCI format selection can be specified or configured. When the DCI defined above is used for the normal PDSCH (not only for the leading PDSCH, but also for other normal PDSCHs in some cases), the length of the PDSCH is It is set to be 14 if there is no PDCCH region.

Specifically, for the end subframe boundary field in DCI, use 1 bit to indicate the end time (e.g., end subframe boundary) for the subframe for sending DCI on (E)PDCCH, for example. be able to. For example, '0' indicates that the PDSCH ends at the start boundary of the subframe that sends DCI (first subframe boundary in FIG. 6), and '1' indicates the end boundary of the subframe that sends DCI (first subframe boundary in FIG. 6). indicates that the PDSCH ends at the second subframe boundary).

For example, regarding the length indicator for indicating the length of the leading PDSCH in units of OFDM symbols, for example, PDSCH length from 1 to 14 ("14" indicates normal PDSCH) OFDM symbols using 4 bits can be shown. However, in order to reduce the signaling overhead as well as improve DCI robustness by reducing the coding rate, a reduced number of bits is also used in conjunction with a reduced set of possible starting positions. can be used for For example, a 2-bit indicator can be used for lengths of 3/6/9/14 OFDM symbols, or a 1-bit indicator can be used for lengths of 7/14 OFDM symbols.

The above method can be applied to OFDM symbols with extended CP as well. According to the first embodiment, it may be necessary to buffer PDSCHs of different lengths at the eNB due to the unpredictable time when CCA will succeed, and the UE may be required to A frame may have to be buffered.

(Second embodiment)
In a second embodiment, the eNB uses the subframe (current sub The PDSCH at the beginning of the burst, which ends at the end boundary of the next subframe of the frame), can be transmitted. For example, after successful CCA on an unlicensed band, the eNB sends data on PDSCH starting from the first OFDM symbol available for data transmission and ending at the ending boundary of the subframe next to the current subframe. As described in the first embodiment, reservation signals such as preamble, RTS/CTS or PSS/SSS can be sent before the leading PDSCH after CCA termination, so that the first available OFDM symbol is Note that it need not be the first OFDM symbol of . The leading PDSCH of the burst in the second embodiment is the extended PDSCH.

FIG. 7 schematically illustrates an example timeline diagram for licensed carriers and unlicensed carriers according to the second embodiment of the present disclosure. As shown in FIG. 7, in the unlicensed band, data on the leading PDSCH (enhanced PDSCH) can be sent by starting from the first symbol boundary after the CCA. Optionally, a reservation signal can be sent before the leading PDSCH as well. The end of the first PDSCH is the end boundary of the subframe next to the current subframe, ie the second subframe boundary shown in FIG.

As described in the first embodiment, when there is no PDCCH region in the unlicensed band in the normal CP, the normal PDSCH consists of 14 OFDM symbols. Therefore, the first part of the leading PDSCH (shortened PDSCH part) in the second embodiment, starting from the first available OFDM symbol to the ending boundary of the current subframe, is reduced from 14 to 1 OFDM symbol. can have The first part is the same as the leading PDSCH in the first embodiment. The second portion of the leading PDSCH (normal PDSCH portion) is the normal PDSCH sent in the next subframe of the current subframe. In a second embodiment, the first part of the head PDSCH is scheduled with the second part as one enhanced PDSCH, e.g. be.

The bits of the enhanced PDSCH can be: i.e.

1. The separately coded transport blocks, ie the bits in the first part and the bits in the second PDSCH are coded separately. For the first part as shortened PDSCH, in order to minimize the impact on the specification, the same PDSCH mapping, RS mapping and TBS decision from the same shifted DwPTS as used in the first embodiment are can be used.

2. The jointly coded transport blocks, ie the bits in the first part and the bits in the second part, are jointly coded and mapped as one enhanced PDSCH. In this case, reuse the RS mapping specified in 3GPP 36.211 and new TBS determination, e.g.

where N _PRB is the column index of the TBS table in 3GPP 36.213, N′ _PRB is the total number of allocated PRBs, and β is the data RE on the target PDSCH. (e.g., β can be derived through dividing the number of data REs in the target PDSCH by the average number of data RESs in the existing PDSCH; in addition, for different PDSCH lengths different βs may be used for each PDSCH length, or a common β may be used for multiple PDSCH lengths, eg by averaging the individual βs).

3. TTI bundling, i.e. the bits in the first part and the bits in the second part are the same/different RV (Redundant Version) of the same coded bits of the transport block, while the first part is used It can be truncated 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 a second embodiment, DCI will be sent on the PDCCH/EPDCCH of the licensed band to indicate the duration of the first PDSCH of the burst on the unlicensed carrier. DCI may be sent after an unlicensed channel is occupied by an eNB or before an unlicensed channel is occupied by an eNB. For example, DCI can be sent in subframes that transmit the first portion or the second portion of the leading PDSCH. In the example of FIG. 7, the DCI is sent in the subframes that transmit the second portion. The DCI for the starting PDSCH includes at least a length indicator that indicates the length of the starting PDSCH and can optionally include an end indicator that indicates the ending time of the starting PDSCH. In the second embodiment, the subframe to send DCI can be fixed or configured to be either the subframe transmitting the first part or the subframe transmitting the second part of the leading PDSCH. So the UE can know the end of the leading PDSCH and can therefore omit the end indicator. For example, 4 bits can be used to indicate the PDSCH length from 15 to 28 OFDM symbols with respect to the length indicator for indicating the length of the leading PDSCH in units of OFDM symbols, for example. Alternatively, in order to reduce signaling overhead as well as improve DCI robustness by reducing the coding rate, a reduced number of bits is also used in conjunction with a reduced set of possible starting positions. can be used for For example, a 2-bit indicator can be used for lengths of 15/20/23/26 OFDM symbols, or a 1-bit indicator can be used for lengths of 15/20 OFDM symbols.

The above method can be applied to OFDM symbols with extended CP as well. According to this embodiment, it may be necessary to buffer PDSCHs of different lengths at the eNB due to the unpredictable time of successful CCA, and the UE may use the previous subframe for the leading PDSCH. One may have to buffer.

(Third Embodiment)
In a third embodiment, the eNB starts from the first available OFDM symbol after the second carrier is occupied by the eNB, and either the end boundary of the subframe where the first PDSCH begins or the next of the subframe where the first PDSCH begins. The PDSCH at the beginning of the burst, which ends on either of the subframe end boundaries of . Here, an eNB using one DCI format can adopt both the PDSCH scheduling mechanisms in the first and second embodiments, which one is adopted depends on the scheduling strategy at the eNB. will do. In other words, whether the shortened PDSCH as in the first embodiment 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 each case. It is noted that the DCI format in the third embodiment can be used for normal PDSCH as well. In the third embodiment, PDSCH mapping, RS mapping, TBS determination and coding may use the same methods as in the first and second embodiments, respectively.

A scheduling strategy at an eNB may consider one or more of the following features. i.e.

1. UE Capabilities:
If the UE does not support the enhanced PDSCH, the enhanced PDSCH will not be scheduled for this UE If the UE does not support the shortened PDSCH, the shortened PDSCH will not be scheduled for this UE The UE is normal If only a single PDSCH is supported, the shortened/extended PDSCH will not be scheduled for this UE, i.e. the UE will only be scheduled in the middle of the burst.

2. Unlicensed Channel Terms:
If the shortened PDSCH contains too few OFDM symbols or contains no RSs, the extended PDSCH will preferably be scheduled.

3. Licensed control overhead:
If the load on the PDCCH/EPDCCH of the licensed band is high, the enhanced PDSCH will be preferred as it requires less scheduling overhead.

4. eNB's fixed preferences ◆ For example, eNB's given preferences

DCI will be sent on the PDCCH/EPDCCH of the licensed band to indicate the duration of the first PDSCH of the burst on the unlicensed carrier. DCI may be sent after an unlicensed channel is occupied by an eNB or before an unlicensed channel is occupied by an eNB. For example, FIG. 8 schematically illustrates an example timeline diagram for licensed carriers and unlicensed carriers according to the third embodiment of the present disclosure. As shown in FIG. 8, three possible leading PDSCHs in the unlicensed band are illustrated, the top one being the enhanced PDSCH described in the second embodiment and the middle one in the first embodiment. The normal PDSCH as a special case described, and the bottom one is the shortened PDSCH described in the first embodiment. In order to uniformly represent the duration of the three PDSCHs in one DCI format, the DCI for the leading PDSCH is the subframe that transmits the second part of the enhanced PDSCH or the normal PDSCH, as shown in FIG. be transmitted in the subframe next to the subframe in which the PDSCH is transmitted or the subframe in which the shortened PDSCH is transmitted. DCI has a length indicating the end indicator (i.e., the end subframe boundary field) indicating whether the end time of the starting PDSCH is the starting boundary or the ending boundary of the subframe transmitting the DCI and the length of the starting PDSCH. An indicator can be included.

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

For example, 5 bits can be used to indicate the PDSCH length from 1 to 28 OFDM symbols with respect to the length indicator for indicating the length of the leading PDSCH in units of OFDM symbols, for example. Alternatively, use a reduced number of bits in conjunction with a reduced set of possible starting positions to reduce signaling overhead as well as improve DCI robustness by reducing the coding rate. can do. For example, if DCI is sent in subframes as shown in FIG. 8, the length of PDSCH is Can be only 1-13 symbols (shortened PDSCH), PDSCH is 14-28 symbols long if PDSCH ends at the end boundary of the subframe sending DCI (2nd subframe boundary in FIG. 8) only (Normal PDSCH or Enhanced PDSCH). In this case, a 4-bit indicator can be used to indicate a length of 1 to 13 OFDM symbols or a length of 14 to 28 OFDM symbols, and relative to the end indicator, the duration can be determined by the length indicator.

The above method can be applied to OFDM symbols with extended CP as well. According to this embodiment, it may be necessary to buffer PDSCHs of different lengths at the eNB due to the unpredictable time of successful CCA, and the UE may use the previous subframe for the leading PDSCH. One may have to buffer.

(Fourth embodiment)
Due to regulatory constraints on maximum burst length (e.g. maximum burst length < 4ms in Japan) and/or flexible burst start time, it is possible to have flexible burst end time to take advantage of the maximum burst length allowed by local regulations. will be connected. When the last PDSCH of a burst is to end in the middle of a subframe, the shortened PDSCH in DwPTS can be used directly for flexible termination time at OFDM symbol granularity. Alternatively, the shortened PDSCH and one previous normal PDSCH can be jointly scheduled as an enhanced PDSCH by one DCI to one (group of) UEs. The extended PDSCH or shortened PDSCH is considered as flexible last PDSCH of a burst.

The bits of the enhanced PDSCH can be: i.e.
1. The separately coded transport blocks, ie the bits in the shortened PDSCH part of the last subframe and the bits in the normal PDSCH part of the penultimate subframe, are coded separately. For the shortened PDSCH part, use the same PDSCH mapping from shifted DwPTS without shift, RS mapping and TBS decision as used in the first embodiment to minimize the impact on the specification. can be done.

2. The jointly coded transport blocks, i.e. the bits in the shortened PDSCH part of the last subframe and the bits in the normal PDSCH part of the penultimate subframe, are coded and mapped as one enhanced PDSCH. . In this case, reuse the RS mapping specified in 3GPP 36.211 and new TBS determination, e.g.

where N _PRB is the column index of the TBS table in 3GPP 36.213, N′ _PRB is the total number of allocated PRBs, and β is the data RE on the target PDSCH. (e.g., β can be derived through dividing the number of data REs in the target PDSCH by the average number of data RESs in the existing PDSCH; in addition, for different PDSCH lengths different βs may be used for each PDSCH length, or a common β may be used for multiple PDSCH lengths, eg by averaging the individual βs).

3. TTI bundling, i.e. the bits in the shortened PDSCH part of the last subframe and the bits in the normal PDSCH part of the penultimate subframe are in the same/different redundant RVs of the same coded bits of the transport block. , while 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 example timeline diagram for licensed carriers and unlicensed carriers according to the fourth embodiment of the present disclosure. As shown in FIG. 9, in the unlicensed band, the last PDSCH of the burst is the enhanced PDSCH including the normal PDSCH part and the shortened PDSCH part. DCI will be sent on the PDCCH/EPDCCH of the licensed band to indicate the duration of the last PDSCH of the burst on the unlicensed carrier. The DCI for the flexible last PDSCH of the burst (the last PDSCH of the burst as flexible PDSCH) includes a length indicator indicating the length of the last PDSCH, e.g. . DCI may optionally include a start indicator that indicates the start time of the last PDSCH. However, since the start boundary of the last PDSCH can be fixed to the start boundary of the subframe sending DCI, as shown in Figure 9, the UE can know the start of the last PDSCH and thus omit the start indicator. can do. For example, 4 bits can be used to indicate the PDSCH length from 15 to 28 OFDM symbols with respect to the length indicator for indicating the length of the leading PDSCH in units of OFDM symbols, for example. Alternatively, a reduced number of bits (e.g., A 2-bit indicator for 15/20/23/28 OFDM symbol lengths, or a 1-bit indicator for 15/20 OFDM symbol lengths) can be used.

The above method can be applied to OFDM symbols with extended CP as well. In addition, if the last PDSCH of the burst does not employ the extended PDSCH and uses the shortened PDSCH directly, a similar DCI can be used to indicate the duration of the last shortened PDSCH, the only difference being the length for the shortened PDSCH. The indicator is that it indicates the length of 1-13 symbols in case of normal CP. In addition, DCI for shortened DCI can be used similarly for normal PDSCH by indicating a length of 14 for normal CP.

(Fifth embodiment)
In a fifth embodiment, the selection between shortened PDSCH and extended PDSCH for the last PDSCH of a burst may depend on the scheduling strategy at the eNB. Also, the same DCI format can be used for shortened PDSCH and enhanced PDSCH and optionally normal PDSCH.

The scheduling strategy at the eNB will consider one or more of the following features. i.e.

1. UE Capabilities:
If the UE does not support the enhanced PDSCH, the enhanced PDSCH will not be scheduled for this UE If the UE does not support the shortened PDSCH, the shortened PDSCH will not be scheduled for this UE The UE is normal If only a single PDSCH is supported, the shortened/extended PDSCH will not be scheduled for this UE, i.e. the UE will only be scheduled in the middle of the burst.

2. Unlicensed Channel Terms:
If the shortened PDSCH contains too few OFDM symbols or contains no RSs, the extended PDSCH will preferably be scheduled.

3. Licensed control overhead:
If the load on the PDCCH/EPDCCH of the licensed band is high, the enhanced PDSCH will be preferred as it requires less scheduling overhead.

4. eNB's fixed preferences ◆ For example, eNB's given preferences

DCI will be sent on the PDCCH/EPDCCH of the licensed band to indicate the duration of the last PDSCH of the burst on the unlicensed carrier. For example, FIG. 10 schematically illustrates an example timeline diagram for licensed carriers and unlicensed carriers according to the 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 is the extended subframe and the lower one is the shortened subframe. To uniformly indicate the duration of the two types of PDSCH in one DCI format, the DCI for the last PDSCH can be sent in the subframe where the last PDSCH starts to be sent, as shown in FIG. The DCI includes at least a length indicator that indicates the length of the last PDSCH and can optionally include a start indicator that indicates the start time of the last PDSCH. In a fifth embodiment, the start boundary of the last PDSCH can be fixed to the start boundary of the subframe sending DCI, as shown in FIG. 10, so that the UE can know the start of the last PDSCH, Therefore, the start indicator can be omitted. For example, 5 bits can be used to indicate the PDSCH length from 1 to 28 OFDM symbols with respect to the length indicator for indicating the length of the leading PDSCH in units of OFDM symbols, for example. Alternatively, a reduced number of bits (e.g., 2-bit indicator for the length of 9/11/14/(14+6) OFDM symbols) can be used.

It is noted that the above method can be applied to OFDM symbols with extended CP as well.

(Sixth embodiment)
Based on the third embodiment, whether the shortened PDSCH or the extended PDSCH is scheduled for the first PDSCH of the burst is selected according to the scheduling strategy in the eNB, and one DCI A format can be used to indicate both types of PDSCH. In a fifth embodiment, the selection between the shortened PDSCH and the enhanced PDSCH for the last PDSCH of a burst may similarly depend on the scheduling strategy at the eNB, and both types of PDSCH are similarly divided into one DCI. format. In the sixth embodiment, one DCI format can be used to indicate both the beginning and ending PDSCHs for both shortened and extended PDSCHs. Here, the following cases are possible. 2) shortened PDSCH at the beginning of the burst and extended PDSCH at the end of the burst; 3) extended PDSCH at the beginning of the burst and the shortened PDSCH at the end of the burst; A shortened PDSCH at the end and 4) an extended PDSCH at the beginning of a burst and an extended PDSCH at the end of a burst. It is noted that, as a special case, the first and last PDSCH may be normal PDSCH as well, which is also optionally indicated by the DCI defined in the sixth embodiment. Whether the eNB uses the normal DCI or the DCI specified in this disclosure for the normal PDSCH can be specified or configured.

FIG. 11 schematically illustrates an example timeline diagram for licensed carriers and unlicensed carriers according to the sixth embodiment of the present disclosure. As shown in FIG. 11, three possible leading PDSCHs and three possible last PDSCHs in the unlicensed band are illustrated, the first column PDSCH is the shortened PDSCH as the leading PDSCH, and the second column PDSCH. is the extended PDSCH as the leading PDSCH, the PDSCH in the 3rd column is the normal PDSCH as the leading PDSCH, the PDSCH in the 4th column is the shortened PDSCH as the final PDSCH, and the PDSCH in the 5th column is the final PDSCH. , and the PDSCH in the 6th column is a normal PDSCH as the final PDSCH. The DCI for scheduling each of these PDSCHs is the subframe for transmitting the second part of the extended PDSCH, the subframe for transmitting the normal PDSCH, or the subframe for transmitting the shortened PDSCH when the PDSCH is the leading PDSCH. It may be transmitted in the next subframe, and if the PDSCH is the last PDSCH, it may be transmitted in the subframe in which it begins to be transmitted.

In order to uniformly indicate the duration of all these types of PDSCH 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 in which the DCI is transmitted. or that the PDSCH end time is the end boundary of the subframe transmitting DCI, or that the PDSCH start time is the start boundary of the subframe transmitting DCI. can be done. Additionally, since the DCI for the beginning 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 beginning PDSCH or the last PDSCH.

Specifically, for the start-end indicator, eg, 2 bits can be used to indicate the start or end subframe boundary, eg, for subframes that carry DCI (PDCCH/EPDCCH). For example, '00' can be used to indicate the 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. The PDSCH that ends on the ending subframe boundary of the frame (second subframe boundary in FIG. 11) can be indicated, and '10' is used to indicate the starting boundary of the subframe that sends DCI (first subframe boundary in FIG. 11). The PDSCH starting at the frame boundary) can be indicated.

For the length indicator for indicating the length of the PDSCH, for example 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 (e.g., 6/9/10/11/12/14/(14+3)/(14+6) 3-bit indicators for the OFDM symbol length) can be used.

It is noted that the above method can be applied to OFDM symbols with extended CP as well.

(Seventh embodiment)
In a seventh embodiment, the eNB creates a PDSCH at the beginning of the burst, starting from the first available OFDM symbol after the second carrier is occupied by the eNB, and having a fixed length, especially the normal PDSCH length. can be sent. In other words, in the seventh embodiment, the beginning PDSCH of a burst is a normal length PDSCH with a shifted starting symbol. After successful CCA on an unlicensed band, the eNB starts from the first OFDM symbol available for data transmission (if reserved signals such as preamble, RTS/CTS or PSS/SSS are sent after CCA termination), Data is sent on the PDSCH ending with OFDM symbols based on a fixed number of OFDM symbols. If there is no PDCCH region in the unlicensed band in normal CP, 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 sustains 14 OFDM symbols. In the seventh embodiment, the PDSCH at the beginning of a burst begins and ends at flexible times in units of OFDM symbol boundaries based on CCA termination.

FIG. 12 schematically illustrates an example timeline diagram for licensed carriers and unlicensed carriers according to the seventh embodiment of the present disclosure. As shown in Figure 12, the eNB transmits the beginning PDSCH of a burst starting from the first available OFDM symbol after the second carrier is occupied by the eNB, the beginning PDSCH being one normal PDSCH. Has a fixed length. A normal-length PDSCH with a shifted starting symbol (which can also be referred to as a flexible PDSCH) can reuse the structure of the current normal PDSCH, eg, by global shift or cyclic shift. The global shift is from normal PDSCH to flexible PDSCH such that the beginning of normal PDSCH is shifted to the beginning of flexible PDSCH and the end of normal PDSCH is shifted to the end of flexible PDSCH. means to be shifted The cyclic shift is performed with the flexible PDSCH front normal as shown in FIG. It means that the tail of the flexible PDSCH is derived from the front of the normal PDSCH.

DCI will be sent on the PDCCH/EPDCCH of the licensed band to indicate the duration of the flexible leading PDSCH of the burst on the unlicensed carrier. DCI may be sent after an unlicensed channel is occupied by an eNB or before an unlicensed channel is occupied by an eNB. For example, DCI can be sent in the subframe next to the subframe in which transmission of the leading PDSCH begins. In the example of FIG. 12, the DCI is sent in the subframes that transmit the second portion. The DCI for the leading PDSCH includes an offset length indicator that indicates the offset length of the start time of the leading PDSCH with respect to the reference boundary, and a reference boundary indicator that indicates whether the reference boundary is the start time or the end time of the subframe in which the DCI is transmitted. including.

Specifically, for the reference boundary indicator, for example, 1 bit can be used to indicate the reference boundary for subframes that send DCI, for example (on PDCCH/EPDCCH). For example, a '0' can be used to indicate that the reference boundary is the starting boundary of the subframe sending DCI (the first subframe boundary in FIG. 12), while a '1' , the reference boundary is the end boundary of the subframe sending 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 no offset and the leading PDSCH is the normal PDSCH. do). A reduced number of bits (e.g., 0/ A 2-bit indicator for 6/9/12 OFDM symbol lengths) can be used.

Referring back to FIG. 12, for the second PDSCH of a burst, a shortened PDSCH can be employed to align with subsequent subframe boundaries. The shortened 2nd PDSCH can be scheduled jointly or independently with the first PDSCH or the 3rd PDSCH. If the shortened PDSCH is scheduled independently, the method of PDSCH & RS mapping and TBS determination in the first embodiment can be used. If the shortened PDSCH is scheduled together with the first PDSCH or the third PDSCH as one extended PDSCH, the method of PDSCH & RS mapping and TBS determination in the second embodiment can be used. It is noted that the second PDSCH of a burst and possibly subsequent PDSCHs may similarly employ a fixed length shifted PDSCH. In this case, the scheduling method for the second PDSCH is the same as for the fixed length shifted leading PDSCH.

In addition, as another example of the seventh embodiment, the leading PDSCH is not necessarily a fixed-length PDSCH, and similarly, a PDSCH that ends at the end boundary of the subframe that starts the leading PDSCH (for example, a shortened PDSCH) or a leading PDSCH. can be a PDSCH end indicator to an indicator that has a fixed length, or a PDSCH ending at the end boundary of the subframe next to the subframe starting the first PDSCH (extended PDSCH). FIG. 14 schematically illustrates an example timeline for licensed carriers and unlicensed carriers according to this example of the seventh embodiment of the present disclosure. In FIG. 14 three possible leading PDSCHs in the unlicensed band are illustrated. The top PDSCH is a PDSCH with a fixed length of one normal PDSCH, the middle 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 starting PDSCH has a fixed length, that the starting PDSCH is the shortened PDSCH, or that the starting PDSCH is the extended PDSCH. For example, using a 2-bit indicator to indicate such, e.g., '00' for fixed length PDSCH, '01' for shortened PDSCH, '10' for extended PDSCH, etc. can be done. When the leading PDSCH is the 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 the 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. show. The DCI defined for this embodiment can be used similarly for the normal PDSCH, for example by setting the offset length to 0 for a PDSCH with a fixed length of one normal PDSCH length. is noted.

Similarly, the above method can be applied to OFDM symbols with extended CP as well.

The present invention can be implemented in software, hardware, or software in conjunction with hardware. Each functional block used in the description of each embodiment above 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, system LSI, super LSI, or ultra LSI, depending on the degree of integration. However, the technology for implementing integrated circuits is not limited to LSIs and can be implemented using dedicated circuits or general-purpose processors. In addition, a Field Programmable Gate Array (FPGA) that can be programmed after the LSI is manufactured, or a reconfigurable processor that can reconfigure the connections and settings of the circuit cells arranged inside the LSI may be used. . Furthermore, the calculation of each functional block can be performed by using a calculation means including, for example, a DSP or CPU, and the processing steps of each function are recorded in a recording medium as a program for execution. good too. Moreover, when advances in semiconductor technology or other derivative technologies emerge to replace LSI with technologies for implementing integrated circuits, it is clear that functional blocks can be integrated by using such technologies.

Without departing from the spirit and scope of the invention, the present invention is intended to undergo various changes and modifications by those skilled in the art based on the description presented herein and known techniques, and such changes and applications include: It is noted that it is included in the claims to be protected. Moreover, the constituent elements of the above-described embodiments can be arbitrarily combined without departing from the scope of the present invention.

Claims (16)

a controller that identifies OFDM symbol groups in one or two consecutive subframes for transmitting downlink data on an unlicensed carrier;
Transmit scheduling information on a licensed carrier in the first half subframe in the one or two consecutive subframes, and downlink data mapped to the OFDM symbol group in the one or two consecutive subframes a transmitter for transmitting;
and
wherein the number of symbols of the OFDM symbol group is selected from a subset having a number of elements less than the number of symbols that the OFDM symbol group can have in the one or two consecutive subframes;
Communication device. The end position of the OFDM symbol group is set to a variable position different from the subframe boundary,
A communication device according to claim 1 . The end position of the OFDM symbol group is shifted in OFDM symbol units from the subframe boundary,
A communication device according to claim 1 . wherein the subset contains 6, 9, 10, 11, 12, 14 symbol numbers;
4. A communication device according to any one of claims 1-3. The scheduling information is arranged in a 4-bit field in a DCI format, and the value of the 4-bit field indicates the number of OFDM symbols included in the OFDM symbol group in the one or two consecutive subframes. ,
5. A communication device according to any one of claims 1-4. The end position of the OFDM symbol group coincides with the end position of a downlink pilot time slot (DwPTS) in one subframe of the one or two consecutive subframes.
6. A communication device according to any one of claims 1-5. The start position of the OFDM symbol group in the first half subframe for downlink data transmission is set to a variable position different from the subframe boundary,
4. A communication device according to any one of claims 1-3. identifying OFDM symbols in one or two consecutive subframes that transmit downlink data for an unlicensed carrier;
Transmitting scheduling information on a licensed carrier in the first half of the one or two consecutive subframes,
transmitting downlink data mapped to the OFDM symbols in the one or two consecutive subframes;
wherein the number of symbols of the OFDM symbol group is selected from a subset having a number of elements less than the number of symbols that the OFDM symbol group can have in the one or two consecutive subframes;
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 in OFDM symbol units from the subframe boundary,
The communication method according to claim 8. wherein the subset contains 6, 9, 10, 11, 12, 14 symbol numbers;
A communication method according to any one of claims 8 to 10. The scheduling information is arranged in a 4-bit field in a DCI format, and the value of the 4-bit field indicates the number of OFDM symbols included in the OFDM symbol group in the one or two consecutive subframes. ,
A 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 a downlink pilot time slot (DwPTS) in one subframe of the one or two consecutive subframes.
A communication method according to any one of claims 8 to 12. The start position of the OFDM symbol group in the first half subframe for downlink data transmission is set to a variable position different from the subframe boundary,
A communication method according to any one of claims 8 to 11. identifying OFDM symbols in one or two consecutive subframes for transmitting downlink data on an unlicensed carrier;
Scheduling information is received on a licensed carrier in the first half subframe in the one or two consecutive subframes, and the downlink data mapped to the OFDM symbol group in the one or two consecutive subframes to control the receiving process and
wherein the number of symbols of the OFDM symbol group is selected from a subset having a number of elements less than the number of symbols that the OFDM symbol group can have in the one or two consecutive subframes;
integrated circuit. wherein the subset contains 6, 9, 10, 11, 12, 14 symbol numbers;
16. The integrated circuit of Claim 15.

Images