WO2017169589A1 - ユーザ装置及び通信方法 - Google Patents
ユーザ装置及び通信方法 Download PDFInfo
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- WO2017169589A1 WO2017169589A1 PCT/JP2017/009227 JP2017009227W WO2017169589A1 WO 2017169589 A1 WO2017169589 A1 WO 2017169589A1 JP 2017009227 W JP2017009227 W JP 2017009227W WO 2017169589 A1 WO2017169589 A1 WO 2017169589A1
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Definitions
- massive MIMO that performs beam forming with a narrow beam width by installing a large number of antenna elements (eg, 100 elements) in a base station in order to effectively use a high frequency band.
- a technique called "" is being studied.
- NOMA non-orthogonal multiple access
- FIG. 1 is a diagram illustrating an example of a self-contained subframe.
- subframe usage DL (Downlink) or UL (Uplink)
- ACK / NACK feedback for DL data can be provided within one subframe. It becomes possible to do.
- FIG. 1A illustrates a case where the usage of the subframe is switched to the DL data channel
- FIG. 1B illustrates a case where the usage of the subframe is switched to the UL data channel. Is.
- LTE is not only a communication method corresponding to Release 8 or 9 of 3GPP, but also Releases 10, 11, 12, 13, 3GPP. Alternatively, it is used in a broad sense including a fifth generation communication system corresponding to Release 14 or later.
- FIG. 3 is a diagram illustrating a configuration example of a wireless communication system according to the embodiment.
- the radio communication system according to the present embodiment includes a base station eNB and a user apparatus UE.
- the radio communication system according to the present embodiment includes a base station eNB and a user apparatus UE.
- one base station eNB and one user apparatus UE are illustrated, but a plurality of base stations eNB may be included, or a plurality of user apparatuses UE may be included.
- DL CCH downlink control channel
- RRC broadcast information
- FIG. 4 is a diagram for explaining an example of a subframe configuration (DL data) and feedback timing.
- the subframe shown in FIG. 4 includes a downlink control channel, a downlink data channel, and an uplink control channel (UL CCH: Uplink Control Channel) in one subframe.
- UL CCH Uplink Control Channel
- the number of symbols allocated to the downlink data channel is set to be small.
- ACK / NACK for data transmitted on the downlink data channel is transmitted in the same subframe. It is set to feed back using the uplink control channel.
- the number of symbols allocated to the downlink data channel is set to be large.
- ACK / NACK for data transmitted on the downlink data channel is transmitted to the next subframe. It is set to feed back using the uplink control channel.
- the subframe configuration of FIG. 4A since the number of symbols set in the downlink data channel is small, the maximum TB size that can be mapped to the downlink data channel is small, but ACK / NACK is fed back in the same subframe. Therefore, there is an advantage that the delay is shortened.
- the subframe configuration of FIG. 4B has an advantage that the maximum TB size that can be mapped to the downlink data channel is large although the delay is slightly increased because the number of symbols set in the downlink data channel is large.
- FIGS. 5 and 6 are diagrams for explaining an example of a subframe configuration (UL data) and feedback timing.
- the subframes shown in FIGS. 5 and 6 include a downlink control channel, an uplink data channel, and an uplink control channel in one subframe.
- the number of symbols allocated to the uplink data channel is set to be small, and ACK / NACK for data transmitted on the uplink data channel is further reduced.
- the feedback is set using the downlink control channel in the next subframe.
- the number of symbols allocated to the uplink data channel is set to be large, and ACK / NACK for data transmitted on the uplink data channel is further set.
- the UL grant shown in FIGS. 6A and 6B is intended to be transmitted when uplink data is retransmitted with radio resource scheduling (that is, Adaptive retransmission in LTE). (Equivalent to adaptive retransmission).
- the NACK shown in FIGS. 6A and 6B is intended to be transmitted when uplink data is retransmitted without new scheduling (that is, Non-adaptive retransmission in LTE). (Equivalent to non-adaptive retransmission).
- radio frame configuration used when the base station eNB and the user apparatus UE perform communication in the present embodiment has been described above, but the channel configurations in the subframes illustrated in FIGS. 4 to 6 are examples, and the present invention is not limited to this. I can't.
- a radio frame in which another physical channel or predetermined header information or the like is set at the head of a subframe and a downlink control channel is set thereafter is also included in the present embodiment.
- a radio frame in which an uplink control channel is set between a downlink control channel and an uplink (or downlink) data channel is also included in the present embodiment.
- FIG. 7 is a sequence diagram illustrating an example of a processing procedure when setting the subframe configuration, the feedback timing, and the like in the user apparatus.
- step S11 the base station eNB selects the downlink data channel or / and uplink data channel resource position (symbol mapping) in the subframe, downlink HARQ feedback timing or / and uplink HARQ feedback timing (uplink uplink). Including the timing at which retransmission scheduling information is transmitted) is set in the user apparatus UE.
- information indicating the resource position (symbol mapping) of the downlink data channel and / or uplink data channel in the subframe is referred to as “radio frame setting information” for convenience.
- information indicating downlink HARQ feedback timing or / and uplink HARQ feedback timing is referred to as “feedback timing setting information” for convenience.
- the base station eNB may set the radio frame setting information and the feedback timing setting information in the user apparatus UE in the cell by broadcast information (SIB), or may be set individually in the user apparatus UE by an RRC message. .
- the base station eNB transmits downlink control information (DCI: Downlink Control Information) including radio frame setting information and feedback timing setting information in a common search space of the downlink control channel, whereby radio frame setting information and feedback timing setting are transmitted.
- DCI Downlink Control Information
- the information may be commonly set for the user apparatus UE in the cell, or may be individually set for the user apparatus UE by transmitting in the dedicated search space of the downlink control channel.
- step S12 the user apparatus UE performs reception of downlink data and / or transmission of uplink data according to the resource position of the downlink data channel or / and uplink data channel in the set subframe.
- step S13 the user apparatus UE transmits ACK or NACK for downlink data to the base station eNB according to the set HARQ feedback timing. Also, the user apparatus UE receives ACK or NACK (NACK or retransmission scheduling information) for uplink data according to the set HARQ feedback timing (including timing at which retransmission scheduling is performed).
- the radio frame setting information and the feedback timing setting information are individually set in the user apparatus UE by the RRC message, and the RRC message corresponds to Message4 (or Message4) in the random access procedure.
- the default radio frame setting information and the feedback timing setting information may be fixedly defined (stored in the user apparatus UE in advance) according to standard specifications or the like, or may be stored in the user apparatus UE.
- Pre-configuration (Pre-Configure) may be performed in advance, or notification information may be notified. Thereby, it is possible to avoid the problem that the user apparatus UE cannot recognize the subframe configuration and the HARQ feedback timing until Message 4 is received.
- the resource position of the downlink data channel or / and uplink data channel may be specified by the start symbol position and the end symbol position of the downlink data channel or / and uplink data channel. Further, for example, as shown in FIG. 8, it may be expressed in a bitmap format. Further, the start symbol position of the downlink data channel or / and the uplink data channel may be fixed in advance, and only the end symbol position may be included in the radio frame setting information. In addition, a plurality of patterns indicating the start symbol position and / or the end symbol position of the downlink data channel or / and the uplink data channel are defined in advance by standard specifications, and the wireless frame setting information includes a plurality of patterns defined in advance.
- the index value is not explicitly specified, and the RNTI (for example, RNTI used for the common search space) or the DCI format (for example, the common search space).
- the index value may be implicitly specified by the DCI format used in
- the feedback timing setting information may further include a timing (or timing candidate) at which downlink scheduling information (DL assignment) when downlink data is retransmitted can be transmitted.
- a timing or timing candidate
- the user apparatus UE determines that the retransmission has timed out and the buffer (buffer of the HARQ process corresponding to downlink data) ) Can be deleted.
- the user apparatus UE can use the deleted buffer for other purposes (for example, reception of a D2D signal).
- the timing is referred to as a HARQ RTT (Round Trip Time) timer, and the timer is defined as 8 ms or more for downlink retransmission data.
- the maximum TB size that can be mapped to the downlink data channel or the uplink data channel differs depending on the number of symbols of the downlink data channel or the uplink data channel. Even with the same number of symbols, it is assumed that the time required for demodulation and decoding of downlink data varies depending on the processing capability of the user apparatus UE.
- the base station eNB sets the downlink HARQ feedback timing or / and uplink HARQ feedback timing (timing at which uplink retransmission scheduling information is transmitted) out of the feedback timing setting information.
- a plurality of patterns according to the processing capability of the user apparatus UE may be included. Further, the user apparatus UE may select a pattern according to its own processing capability from among the plurality of patterns, and perform ACK / NACK feedback for downlink data according to the selected pattern. In addition, the user apparatus UE selects a pattern according to its own processing capability from the plurality of patterns, and receives ACK / NACK (or scheduling information related to retransmission) for uplink data according to the selected pattern. Also good.
- the user apparatus UE notifies the base station eNB of capability information (UE Capability) indicating its own processing capability in advance, and the base station eNB transmits each of the plurality of user apparatuses UE existing in the cell.
- UE Capability capability information
- a plurality of patterns to be included in the feedback timing setting information may be determined within the range of processing capability.
- the user apparatus UE notifies the base station eNB of its own processing capability in advance, and the base station eNB determines the processing capability of each of the plurality of user apparatuses UE existing in the cell.
- the base station eNB determines the processing capability of each of the plurality of user apparatuses UE existing in the cell.
- only a pattern that can be handled by the user apparatus UE with the lowest processing capability may be included in the feedback timing setting information and set in common to each user apparatus UE in the cell.
- the feedback timing of ACK / NACK is unified between user apparatuses UE, it becomes possible to improve the utilization efficiency of a radio
- the number of symbols of the downlink data channel is made variable.
- the downlink data channel or the uplink data channel is further divided into a plurality of segments in the time direction.
- different TBs may be mapped to each segment.
- the maximum size of TB that can be transmitted is reduced, so the user equipment UE and the base station eNB reduce the time required for demodulation and decoding per TB can do.
- the user apparatus UE and the base station eNB can start demodulation and decoding at the time when the reception of the segment is completed even in the middle of the subframe. Thus, communication with lower delay can be realized.
- FIG. 10A shows an example in which resources for different user apparatuses UE (UE # 1, UE # 2) are allocated for each segment.
- UE user apparatuses UE
- FIG. 10A it is necessary to transmit downlink scheduling information for each user apparatus UE (UE # 1, UE # 2).
- the user apparatus UE (UE # 1) that requests low-delay communication is used.
- processing such as assigning downlink data to the first segment becomes possible.
- FIG. 10B shows an example in the case where the same resource for the user apparatus UE is allocated to a plurality of segments.
- resources of a plurality of segments can be allocated with one downlink scheduling information.
- the user apparatus UE can perform demodulation and decoding of the first received TB # 1 in parallel while receiving the next TB # 2, thereby realizing communication with lower delay.
- FIG. 10C illustrates an example in which resource allocation is performed for the user apparatus UE # 1 in the same manner as in FIG. 10B, and resource allocation is performed across segments for the user apparatus UE # 2. Is shown.
- the segment (Seg # 1) and the segment (Seg # 2) are set as the downlink data channel and the uplink data channel, respectively, and the resource for the user apparatus UE # 1 is assigned to the segment (Seg # 1).
- the example in the case of allocating the resource for user apparatus UE # 2 to allocation and a segment (Seg # 2) is shown.
- FIG.11 (b) sets a segment (Seg # 1) and a segment (Seg # 2) to an uplink data channel, allocates the resource for user apparatus UE # 1 to a segment (Seg # 1), and segments (Seg # 1).
- # 2) shows an example in which a resource for user apparatus UE # 2 is allocated.
- the case where the number of segments is 2 is illustrated.
- the present invention is not limited to these, and the segment can be divided into three or more segments.
- the above-described radio frame setting information may include information indicating the range of each segment.
- FIG. 12 is an example of radio frame setting information including a segment range.
- the radio frame setting information may include a bit map indicating symbol mapping of the downlink data channel or uplink data channel and a symbol index indicating the end symbol position of each segment.
- a plurality of patterns indicating the start symbol position and end symbol position of the downlink data channel or uplink data channel and the division positions of the segments of the downlink data channel or uplink data channel are defined in advance in a standard specification, etc.
- the frame setting information only an index value indicating a pattern to be applied among a plurality of predetermined patterns may be set.
- the index value is not explicitly specified, and the RNTI (for example, RNTI used for the common search space) or the DCI format (for example, The index value may be implicitly specified by the DCI format used for the common search space.
- the symbol index indicating the end symbol position of each segment has the same value, it means that the segment is not divided.
- the end symbol index of the segment (Seg1) and the segment (Seg2) is set to “9”, it may mean that the segment is not divided.
- the user apparatus UE When demodulating downlink data, the user apparatus UE performs channel estimation using at least a reference signal (Reference Signal) present in a resource to which downlink data is mapped, and performs demodulation processing using a channel estimation result Is desirable.
- a reference signal Reference Signal
- the number of symbols and the number of segments used for the downlink data channel can be set variously. However, depending on the setting contents and scheduling, downlink data is mapped to only some symbols. (In other words, for some symbols, downlink data is not mapped) is also assumed.
- the base station eNB transmits a reference signal for symbols to which downlink data is not mapped, and the user apparatus UE uses symbols in the downlink data resources allocated to itself. You may make it perform a demodulation process by performing channel estimation using both the reference signal transmitted and the reference signal transmitted with the symbol in the resource which is not allocated to self.
- the user apparatus UE when downlink data for itself is mapped to a second half symbol of the downlink data channel, the user apparatus UE transmits a reference signal transmitted using the second half symbol of the downlink data channel. And the demodulation process may be performed using both of the reference signals transmitted in the first half symbols. Also, as shown in FIG. 14 (b), when downlink data intended for itself is mapped to the first half symbols of the downlink data channel, the user apparatus UE transmits a reference signal transmitted using the first half symbols of the downlink data channel. Further, demodulation processing may be performed using both of the reference signal transmitted in the second half symbol. In the case of FIG.
- the user apparatus UE temporarily performs demodulation and decoding processing using the reference signal transmitted in the first half symbol, and feeds back the decoding result to the base station eNB (ACK / NACK). (Send).
- the user apparatus UE cannot correctly decode (that is, when NACK is transmitted)
- the user apparatus UE performs demodulation and decoding processing again using the reference signal transmitted in the latter half symbol, and the base station eNB
- the data that has been demodulated and decoded again and the retransmitted data may be combined. This makes it possible to improve BLER (Block Error Rate).
- the base station eNB uses the RRC message or the downlink control information to enable the coexistence with the user apparatus UE that does not correspond to the present embodiment, or a specific symbol or / And it may be possible to instruct the user apparatus UE (user apparatus UE not corresponding to the present embodiment) not to transmit (puncture) a signal in the frequency resource.
- the user apparatus UE that has received the instruction operates not to transmit (puncture) a signal in the specified specific symbol or / and frequency resource.
- FIG. 15 is a diagram illustrating an example of a functional configuration of the user apparatus according to the embodiment.
- the user apparatus UE includes a signal transmission unit 101, a signal reception unit 102, an acquisition unit 103, and a capability notification unit 104.
- FIG. 15 shows only functional units that are particularly related to the embodiment of the present invention in the user apparatus UE, and has at least a function (not shown) for performing an operation based on LTE.
- the functional configuration shown in FIG. 15 is only an example. As long as the operation according to the present embodiment can be performed, the function classification and the name of the function unit may be anything. However, a part of the processing of the user apparatus UE described so far (eg, specific one or a plurality of modified examples, specific examples, etc.) may be executable.
- the signal transmission unit 101 includes a function of generating and wirelessly transmitting various physical layer signals from higher layer signals to be transmitted from the user apparatus UE.
- the signal reception unit 102 includes a function of wirelessly receiving various signals from another user apparatus UE or the base station eNB and acquiring a higher layer signal from the received physical layer signal.
- the signal transmission unit 101 has a function of transmitting a HARQ response for downlink data received through the downlink data channel at a timing at which a HARQ response for downlink data should be transmitted.
- the signal receiving unit 102 has a function of receiving a HARQ response for data transmitted on the uplink data channel or scheduling information (UL grant) for retransmission data at a timing of receiving a HARQ response for uplink data.
- the signal receiving unit 102 when the signal receiving unit 102 does not receive the retransmission data for the downlink data from the base station eNB by the timing of receiving the retransmission data for the downlink data, the signal receiving unit 102 is configured to use a buffer of the HARQ process corresponding to the downlink data (for example, the bit of the Soft channel). ) May be deleted. Further, the signal reception unit 102 may change the number of bits of the Soft channel held by the user apparatus UE itself. As a result, the reduced buffer (bit) can be used for other purposes such as D2D.
- a buffer of the HARQ process corresponding to the downlink data for example, the bit of the Soft channel.
- the signal receiving unit 102 may receive downlink data mapped to one or more segments specified by the downlink control signal. Further, the signal transmission unit 101 may transmit uplink data using resources of one or more segments specified by the uplink grant.
- the capability notification unit 104 can support the user apparatus UE itself, a resource position to which a downlink data channel is mapped in a radio frame (for example, a subframe) and / or a resource position to which an uplink data channel is mapped, and the user apparatus UE
- the base station eNB indicates capability information indicating a combination of timing capable of performing a HARQ response to downlink data from the base station eNB and / or timing capable of receiving HARQ response to uplink data or scheduling information of retransmission data from the base station eNB. It has a function to notify.
- the setting unit 204 based on the capability information notified from the user apparatus UE, the resource position to which the downlink data channel is mapped in the radio frame (for example, subframe) or the resource position to which the uplink data channel is mapped, and the user You may make it determine the timing which should transmit the HARQ response with respect to downlink data from the apparatus UE, or the timing which should receive the HARQ response with respect to uplink data from the base station eNB.
- the setting unit may set the range of each segment in the user apparatus UE.
- the BB processing module 302 performs processing for mutually converting an IP packet and a digital baseband signal.
- a DSP (Digital Signal Processor) 312 is a processor that performs signal processing in the BB processing module 302.
- the memory 322 is used as a work area for the DSP 312.
- the RF module 301 includes, for example, a part of the signal transmission unit 101, a part of the signal reception unit 102, and a part of the acquisition unit 103 in FIG.
- the RF module 401 generates a radio signal to be transmitted from the antenna by performing D / A conversion, modulation, frequency conversion, power amplification, and the like on the digital baseband signal received from the BB processing module 402.
- a digital baseband signal is generated by performing frequency conversion, A / D conversion, demodulation, and the like on the received radio signal, and passed to the BB processing module 402.
- the RF module 401 includes, for example, part of the signal transmission unit 201 and the signal reception unit 202 illustrated in FIG.
- the device control module 403 performs IP layer protocol processing, OAM (Operation and Maintenance) processing, and the like.
- the processor 413 is a processor that performs processing performed by the device control module 403.
- the memory 423 is used as a work area for the processor 413.
- the auxiliary storage device 433 is, for example, an HDD or the like, and stores various setting information for operating the base station eNB itself.
- the device control module 403 includes, for example, a part of the setting unit 204 illustrated in FIG.
- the acquisition unit acquires information indicating a timing for receiving retransmission data for the downlink data
- the communication unit receives the retransmission data for the downlink data before the timing for receiving retransmission data for the downlink data.
- the HARQ process buffer corresponding to the downlink data may be deleted. Thereby, the user apparatus UE can use the deleted buffer for other purposes.
- the acquisition unit may acquire information indicating the ranges of the plurality of segments via an RRC message or a downlink control signal.
- the base station eNB can change the segment range at various timings.
- Each of the downlink data mapped to the plurality of segments is obtained by dividing the data of one transport block into the same number of code blocks as the number of the plurality of segments, and coding processing for each code block Alternatively, the data may be data after the scramble process is performed. As a result, one TB can be mapped to a plurality of segments, and the user apparatus UE can perform a decoding process in units of segments, thereby realizing lower-latency communication.
- the communication unit when the communication unit performs demodulation processing of downlink data mapped to one or more segments specified by the downlink control signal, a reference signal transmitted in the segment to which downlink data for the user apparatus is mapped Further, demodulation processing may be performed using a reference signal transmitted in a segment to which downlink data for the user apparatus is not mapped. Thereby, the user apparatus UE can improve the channel estimation accuracy and can realize higher-quality communication.
- a communication method executed by a user apparatus in a radio communication system having a base station and a user apparatus, wherein a resource position or an uplink data channel to which a downlink data channel is mapped in a radio frame is mapped Obtaining information indicating a resource position to be transmitted and a timing for transmitting a HARQ response for downlink data from the user apparatus or a timing for receiving a HARQ response for uplink data from the base station, and received on the downlink data channel
- a step of transmitting a HARQ response for downlink data at a timing of transmitting a HARQ response for downlink data, and a scheduling information of HARQ response or retransmission data for data transmitted on the uplink data channel, Communication method having the steps of receiving at the timing of receiving the HARQ response to data is provided. This provides a technology capable of appropriately realizing low-delay communication when using a radio frame configuration capable of flexibly switching between DL and UL.
- Each aspect / embodiment described in this specification includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G, 5G, FRA (Future Radio Access), W-CDMA.
- LTE Long Term Evolution
- LTE-A Long Term Evolution-Advanced
- SUPER 3G IMT-Advanced
- 4G 5G
- FRA Full Radio Access
- W-CDMA Wideband
- GSM registered trademark
- CDMA2000 Code Division Multiple Access 2000
- UMB User Mobile Broadband
- IEEE 802.11 Wi-Fi
- IEEE 802.16 WiMAX
- IEEE 802.20 UWB (Ultra-WideBand
- the present invention may be applied to a Bluetooth (registered trademark), a system using another appropriate system, and / or a next generation system extended based on the system.
- the determination or determination may be performed by a value represented by 1 bit (0 or 1), may be performed by a true value (Boolean: true or false), or may be performed by comparing numerical values (for example, (Comparison with a predetermined value).
- the channel and / or symbol may be a signal.
- the signal may be a message.
- UE is a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal by those skilled in the art , Remote terminal, handset, user agent, mobile client, client, or some other appropriate terminology.
- notification of predetermined information is not limited to explicitly performed, but is performed implicitly (for example, notification of the predetermined information is not performed). Also good.
- determining may encompass a wide variety of actions.
- “Judgment”, “decision” can be, for example, calculating, computing, processing, deriving, investigating, looking up (eg, table, database or another (Searching in the data structure), and confirming (ascertaining) what has been confirmed may be considered as “determining” or “determining”.
- “determination” and “determination” include receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), and access. (accessing) (e.g., accessing data in a memory) may be considered as “determined” or "determined”.
- determination and “decision” means that “resolving”, “selecting”, “choosing”, “establishing”, and “comparing” are regarded as “determining” and “deciding”. May be included. In other words, “determination” and “determination” may include considering some operation as “determination” and “determination”.
- the phrase “based on” does not mean “based only on”, unless expressly specified otherwise. In other words, the phrase “based on” means both “based only on” and “based at least on.”
- the input / output information or the like may be stored in a specific place (for example, a memory) or may be managed by a management table. Input / output information and the like can be overwritten, updated, or additionally written. The output information or the like may be deleted. The input information or the like may be transmitted to another device.
- the notification of the predetermined information is not limited to explicitly performed, and may be performed implicitly (for example, notification of the predetermined information is not performed). .
- UE user apparatus eNB base station 101 signal transmission unit 102 signal reception unit 103 acquisition unit 104 capability notification unit 201 signal transmission unit 202 signal reception unit 203 resource allocation unit 204 setting unit 301 RF module 302 BB processing module 303 UE control module 304 communication IF 401 RF module 402 BB processing module 403 Device control module
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Abstract
Description
図3は、実施の形態に係る無線通信システムの構成例を示す図である。図3に示すように、本実施の形態に係る無線通信システムは、基地局eNBとユーザ装置UEとを有する。図3の例では、基地局eNB及びユーザ装置UEが1つずつ図示されているが、複数の基地局eNBを有していてもよいし、複数のユーザ装置UEを有していてもよい。
(無線フレーム構成について)
続いて、本実施の形態における基地局eNB及びユーザ装置UEが通信を行う際に用いる無線フレーム構成について説明する。本実施の形態に係る無線フレームは、下り制御チャネル(DL CCH:Downlink Control Channel)又は上位レイヤ(報知情報又はRRC)のメッセージを用いて、1サブフレーム内に設定される下りデータチャネル(DL Data CH:Downlink Data Channel)のリソース位置、又は/及び、上りデータチャネル(UL Data CH:Uplink Data Channel)のリソース位置を設定可能とする。また、下り制御チャネル(DL CCH:Downlink Control Channel)又は上位レイヤ(報知情報又はRRC)のメッセージを用いて、下りリンクのHARQ(Hybrid Automatic Repeat Request)におけるACK/NACKのフィードバックタイミング、又は/及び、上りリンクのHARQフィードバックタイミング(上りリンクの再送スケジューリング情報が送信されるタイミングを含む)を設定可能とする。
図7は、サブフレーム構成及びフィードバックタイミング等をユーザ装置に設定する際の処理手順の一例を示すシーケンス図である。
ここで、下りデータチャネル又は上りデータチャネルのシンボル数により、下りデータチャネル又は上りデータチャネルにマッピング可能な最大TBサイズは異なることになる。また、同一シンボル数であっても、ユーザ装置UEの処理能力によっては、下りデータの復調及び復号に要する時間が異なることが想定される。
これまでに説明したサブフレーム構成では、下りデータチャネルのシンボル数を可変にするようにしていたが、本実施の形態では、更に、下りデータチャネル又は上りデータチャネルを時間方向に複数のセグメントに分割し、各セグメントにそれぞれ異なるTBをマッピング可能にしてもよい。
続いて、下りデータチャネル又は上りデータチャネルが時間方向に複数のセグメントに分割される場合のリソース割当ての例を、図10及び図11を用いて具体的に示す。なお、図10及び図11において、縦方向は任意の帯域幅である。
下りデータチャネル又は上りデータチャネルが複数のセグメントに分割される場合、前述の無線フレーム設定情報に、各セグメントの範囲を示す情報が含まれるようにしてもよい。
以上、各セグメントにそれぞれTBがマッピングされる前提で説明したが、本実施の形態では、1つのTBを複数のセグメントにマッピング可能にしてもよい。この場合、図13に示すように、基地局eNB又はユーザ装置UEは、1つのTBをセグメント数に対応する複数のコードブロックに分割し、コードブロック毎に符号化(Coding)及びスクランブリング(Scrambling)を行い、スクランブリングされたデータを、各セグメントに割当てられたリソースにマッピングするようにしてもよい。ユーザ装置UE又は基地局eNBは、セグメント毎に、信号の復号を行うことが可能になる。
ユーザ装置UEは、下りデータの復調処理を行う際、少なくとも下りデータがマッピングされるリソース内に存在する参照信号(Reference Signal)を用いてチャネル推定を行い、チャネル推定結果を用いて復調処理を行うのが望ましい。ここで、本実施の形態では、下りデータチャネルに使用されるシンボル数及びセグメント数を様々に設定可能であるが、設定内容及びスケジューリング次第では、一部のシンボルのみに下りデータがマッピングされる場合(つまり、一部のシンボルについては下りデータがマッピングされていない場合)も想定される。
本実施の形態では、基地局eNBは、本実施の形態に対応していないユーザ装置UEとの共存を可能にするため、RRCメッセージ又は下り制御情報を用いて、サブフレーム内の特定のシンボル又は/及び周波数リソースにおいて信号を送信しない(パンクチャする)ようにユーザ装置UE(本実施の形態に対応していないユーザ装置UE)に指示することを可能にしてもよい。当該指示を受けたユーザ装置UEは、指示された特定のシンボル又は/及び周波数リソースにおいて信号を送信しない(パンクチャする)ように動作する。
以上説明した複数の実施の形態の動作を実行するユーザ装置UE及び基地局eNBの機能構成例を説明する。
図15は、実施の形態に係るユーザ装置の機能構成の一例を示す図である。図15に示すように、ユーザ装置UEは、信号送信部101と、信号受信部102と、取得部103と能力通知部104とを有する。なお、図15は、ユーザ装置UEにおいて本発明の実施の形態に特に関連する機能部のみを示すものであり、少なくともLTEに準拠した動作を行うための図示しない機能も有するものである。また、図15に示す機能構成は一例に過ぎない。本実施の形態に係る動作を実行できるのであれば、機能区分や機能部の名称はどのようなものでもよい。ただし、これまでに説明したユーザ装置UEの処理の一部(例:特定の1つ又は複数の変形例、具体例のみ等)を実行可能としてもよい。
図16は、実施の形態に係る基地局の機能構成の一例を示す図である。図16に示すように、基地局eNBは、信号送信部201と、信号受信部202と、リソース割当部203と、設定部204とを有する。なお、図16は、基地局eNBにおいて本発明の実施の形態に特に関連する機能部のみを示すものであり、少なくともLTEに準拠した動作を行うための図示しない機能も有するものである。また、図16に示す機能構成は一例に過ぎない。本実施の形態に係る動作を実行できるのであれば、機能区分や機能部の名称はどのようなものでもよい。ただし、これまでに説明した基地局eNBの処理の一部(例:特定の1つ又は複数の変形例、具体例のみ等)を実行可能としてもよい。
図17は、実施の形態に係るユーザ装置のハードウェア構成の一例を示す図である。図17は、図15よりも実装例に近い構成を示している。図17に示すように、ユーザ装置UEは、無線信号に関する処理を行うRF(Radio Frequency)モジュール301と、ベースバンド信号処理を行うBB(Base Band)処理モジュール302と、上位レイヤ等の処理を行うUE制御モジュール303とを有する。
図18は、実施の形態に係る基地局のハードウェア構成の一例を示す図である。図18は、図16よりも実装例に近い構成を示している。図18に示すように、基地局eNBは、無線信号に関する処理を行うRFモジュール401と、ベースバンド信号処理を行うBB処理モジュール402と、上位レイヤ等の処理を行う装置制御モジュール403と、ネットワークと接続するためのインタフェースである通信IF404とを有する。
以上、実施の形態によれば、基地局とユーザ装置とを有する無線通信システムにおけるユーザ装置であって、無線フレームにおいて下りデータチャネルがマッピングされるリソース位置又は上りデータチャネルがマッピングされるリソース位置と、当該ユーザ装置から下りデータに対するHARQ応答を送信するタイミング又は前記基地局から上りデータに対するHARQ応答を受信するタイミングとを示す情報を取得する取得部と、前記下りデータチャネルで受信した下りデータに対するHARQ応答を、前記下りデータに対するHARQ応答を送信するタイミングで送信し、前記上りデータチャネルで送信したデータに対するHARQ応答若しくは再送データのスケジューリング情報を、前記上りデータに対するHARQ応答を受信するタイミングで受信する通信部と、を有するユーザ装置が提供される。このユーザ装置UEによれば、DL及びULを柔軟に切替えることが可能な無線フレーム構成を用いる場合に、低遅延な通信を適切に実現することが可能な技術が提供される。
参照信号は、パイロット信号と呼ばれてもよい。
eNB 基地局
101 信号送信部
102 信号受信部
103 取得部
104 能力通知部
201 信号送信部
202 信号受信部
203 リソース割当部
204 設定部
301 RFモジュール
302 BB処理モジュール
303 UE制御モジュール
304 通信IF
401 RFモジュール
402 BB処理モジュール
403 装置制御モジュール
Claims (8)
- 基地局とユーザ装置とを有する無線通信システムにおけるユーザ装置であって、
無線フレームにおいて下りデータチャネルがマッピングされるリソース位置又は上りデータチャネルがマッピングされるリソース位置と、当該ユーザ装置から下りデータに対するHARQ応答を送信するタイミング又は前記基地局から上りデータに対するHARQ応答を受信するタイミングとを示す情報を取得する取得部と、
前記下りデータチャネルで受信した下りデータに対するHARQ応答を、前記下りデータに対するHARQ応答を送信するタイミングで送信し、前記上りデータチャネルで送信したデータに対するHARQ応答若しくは再送データのスケジューリング情報を、前記上りデータに対するHARQ応答を受信するタイミングで受信する通信部と、
を有するユーザ装置。 - 当該ユーザ装置がサポート可能な、無線フレームにおいて下りのデータチャネルがマッピングされるリソース位置又は上りデータチャネルがマッピングされるリソース位置と、当該ユーザ装置から前記下りデータに対するHARQ応答を行うことが可能なタイミング又は前記基地局から前記上りデータに対するHARQ応答若しくは再送データのスケジューリング情報を受信することが可能なタイミングとの組み合わせを示す能力情報を、前記基地局に通知する能力通知部、を有する、請求項1に記載のユーザ装置。
- 前記取得部は、前記下りデータに対する再送データを受信するタイミングを示す情報を取得し、
前記通信部は、前記下りデータに対する再送データを、前記下りデータに対する再送データを受信するタイミングまでに前記基地局から受信しない場合に、前記下りデータに対応するHARQプロセスのバッファを削除する、
請求項1又は2に記載のユーザ装置。 - 前記下りデータチャネルがマッピングされるリソース位置、又は前記上りデータチャネルがマッピングされるリソース位置は複数のセグメントに区切られており、
前記通信部は、下り制御信号で指定される1以上のセグメントにマッピングされた下りデータを受信し、又は、上りグラントで指定される1以上のセグメントのリソースを用いて上りデータを送信する、
請求項1乃至3のいずれか一項に記載のユーザ装置。 - 前記取得部は、前記複数のセグメントの範囲を示す情報を、RRCメッセージ、又は、下り制御信号を介して取得する、請求項4に記載のユーザ装置。
- 前記複数のセグメントにマッピングされた下りデータの各々は、1つのトランスポートブロックのデータを前記複数のセグメントの数と同一の数のコードブロックに分割し、各々のコードブロックに対してコーディング処理及びスクランブル処理が行われた後のデータである、請求項4又は5に記載のユーザ装置。
- 前記通信部は、下り制御信号で指定される1以上のセグメントにマッピングされた下りデータの復調処理を行う場合、当該ユーザ装置向けの下りデータがマッピングされているセグメントで送信される参照信号と、当該ユーザ装置向けの下りデータがマッピングされていないセグメントで送信される参照信号とを用いて復調処理を行う、請求項4乃至6のいずれか一項に記載のユーザ装置。
- 基地局とユーザ装置とを有する無線通信システムにおけるユーザ装置が実行する通信方法であって、
無線フレームにおいて下りデータチャネルがマッピングされるリソース位置又は上りデータチャネルがマッピングされるリソース位置と、当該ユーザ装置から下りデータに対するHARQ応答を送信するタイミング又は前記基地局から上りデータに対するHARQ応答を受信するタイミングとを示す情報を取得するステップと、
前記下りデータチャネルで受信した下りデータに対するHARQ応答を、前記下りデータに対するHARQ応答を送信するタイミングで送信するステップと、
前記上りデータチャネルで送信したデータに対するHARQ応答若しくは再送データのスケジューリング情報を、前記上りデータに対するHARQ応答を受信するタイミングで受信するステップと、
を有する通信方法。
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WO2020206613A1 (zh) * | 2019-04-09 | 2020-10-15 | 北京小米移动软件有限公司 | 数据反馈、传输方法及装置、基站和用户设备 |
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Publication number | Publication date |
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JP7227001B2 (ja) | 2023-02-21 |
KR20180125981A (ko) | 2018-11-26 |
EP3439356A1 (en) | 2019-02-06 |
EP3439356A4 (en) | 2019-11-20 |
US20200305177A1 (en) | 2020-09-24 |
JPWO2017169589A1 (ja) | 2019-02-07 |
CN108886709B (zh) | 2022-10-21 |
KR102414087B1 (ko) | 2022-06-29 |
CN108886709A (zh) | 2018-11-23 |
US11582637B2 (en) | 2023-02-14 |
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