Terminal device, base station device, communication method, and integrated circuit
阅读说明:本技术 终端装置、基站装置、通信方法以及集成电路 (Terminal device, base station device, communication method, and integrated circuit ) 是由 铃木翔一 大内涉 吉村友树 刘丽清 于 2018-03-29 设计创作,主要内容包括:一种终端装置,在设定有间歇接收的情况下,在激活时间期间尝试PDCCH的解码,在PDCCH指示针对HARQ进程的上行链路发送的情况下,基于是否被指示上行链路发送的结束来确定是否启动用于HARQ进程的UL HARQ RTT定时器。(A terminal device attempts decoding of a PDCCH during an activation time when intermittent reception is set, and determines whether to start an UL HARQ RTT timer for an HARQ process based on whether an end of uplink transmission is instructed or not when the PDCCH instructs uplink transmission for the HARQ process.)
1. A terminal device is provided with:
a reception unit which attempts decoding of a PDCCH during an activation time when intermittent reception is set; and
a medium access control layer processing unit that determines whether to start an UL HARQ RTT timer for an HARQ process based on whether an end of the uplink transmission is instructed, when the PDCCH instructs uplink transmission for the HARQ process.
2. The terminal device according to claim 1,
starting the UL HARQ RTT timer in a subframe containing a last repetition of the uplink transmission.
3. A terminal device is provided with:
at least one processor; and
a memory coupled to the at least one processor,
the at least one processor is designed to: (i) attempting decoding of a PDCCH during an activation time if intermittent reception is set, (ii) performing uplink transmission in a plurality of subframes including a first subframe including a last repetition of the uplink transmission if the PDCCH indicates the uplink transmission for a HARQ process and is not indicated for end of the uplink transmission, (ii) ending the uplink transmission in a second subframe preceding the first subframe and starting an UL HARQ RTT timer for the HARQ process in the first subframe if the PDCCH indicates the uplink transmission for the HARQ process and is indicated for end of the uplink transmission.
4. A communication method for a terminal device, wherein,
in case of setting intermittent reception, decoding of the PDCCH is attempted during the activation time,
determining whether to start an UL HARQ RTT timer for a HARQ process based on whether an end of the uplink transmission is indicated, where the PDCCH indicates an uplink transmission for the HARQ process.
5. A communication method for a terminal device, wherein,
in case of setting intermittent reception, decoding of the PDCCH is attempted during the activation time,
performing uplink transmission in a plurality of subframes including a first subframe of a last repetition of the uplink transmission in a case where the PDCCH indicates uplink transmission for a HARQ process and an end of the uplink transmission is not indicated,
in a case where the PDCCH indicates the uplink transmission for the HARQ process and an end of the uplink transmission is indicated, the uplink transmission is ended in a second subframe preceding the first subframe, and a UL HARQ RTT timer for the HARQ process is started in the first subframe.
Technical Field
The invention relates to a terminal device, a base station device, a communication method and an integrated circuit.
The present application claims priority to japanese patent application No. 2017-086038 filed in japan on 25/4/2017, and the contents of which are incorporated herein by reference.
Background
In the third Generation Partnership Project (3rd Generation Partnership Project: 3GPP), a Radio Access scheme and a wireless Network (hereinafter referred to as "Long Term Evolution (LTE)", "Evolved Universal Radio Access: EUTRA" or "Evolved Universal Radio Access Network: EUTRAN") for cellular mobile communication have been studied. In LTE, a base station device is also referred to as eNodeB (evolved NodeB) and a terminal device is referred to as UE (User Equipment). LTE is a cellular communication system in which areas covered by a plurality of base station apparatuses are arranged in a cell shape. A single base station apparatus may also manage a plurality of cells.
LTE corresponds to Time Division Duplex (TDD). LTE in TDD mode is also referred to as TD-LTE or LTE TDD. In TDD, an uplink signal and a downlink signal are time division multiplexed. Further, LTE corresponds to Frequency Division duplexing (Frequency Division Duplex: FDD).
In LTE, Downlink Control Information (DCI) is transmitted using a PDCCH (Physical Downlink Control CHannel) and an EPDCCH (Enhanced Physical Downlink Control CHannel). The DCI is used for scheduling of a PDSCH (Physical Downlink Shared channel) in a certain cell.
In order to improve the coverage of a cell in the Downlink, a technology for transmitting an MPDCCH (Machine type communication Physical Downlink Control CHannel) spanning a plurality of subframes is studied in 3GPP (non-patent document 1). In order to improve the coverage of a cell in the Uplink, a technique for transmitting a PUCCH (Physical Uplink Control CHannel) over a plurality of subframes is studied in 3GPP (non-patent document 2).
Disclosure of Invention
Problems to be solved by the invention
An aspect of the present invention provides a terminal apparatus capable of efficiently communicating with a base station apparatus using a plurality of physical channels included in a plurality of subframes, a communication method for the terminal apparatus, and an integrated circuit mounted on the terminal apparatus.
Technical scheme
(1) The embodiment of the present invention adopts the following scheme. That is, a first aspect of the present invention is a terminal device including: a measurement unit for calculating a Channel Quality Indicator (CQI); and a transmitting unit configured to repeatedly transmit Uplink Control information including at least the CQI using a plurality of PUCCHs (physical Uplink Control channels) in a plurality of subframes, respectively, and when the Uplink Control information is transmitted in a PUCCH included in a first (initial) subframe of the plurality of subframes, based on whether or not the Uplink Control information includes HARQ-ACK (Hybrid Automatic Repeat Request Acknowledgement), (i) transmit the Uplink Control information using the PUCCH in a first (first) subframe included in the plurality of subframes and other than the first subframe, or (ii) not transmit the Uplink Control information in the first subframe.
(2) A second aspect of the present invention is a communication method for a terminal device, in which one CQI (channel Quality indicator) is calculated, Uplink control information including at least the one CQI is repeatedly transmitted using a plurality of PUCCHs (physical Uplink control channels) in a plurality of subframes, and when the Uplink control information is transmitted in a PUCCH included in a first (initial) subframe of the plurality of subframes, based on whether or not the Uplink control information includes HARQ-ACK (Hybrid Automatic Repeat-Acknowledgement), (i) the Uplink control information is transmitted using the PUCCH in a first (first) subframe included in the plurality of subframes and other than the first subframe, or (ii) the Uplink control information is not transmitted in the first subframe.
(3) A third aspect of the present invention is an integrated circuit mounted on a terminal device, including: a measurement circuit for calculating a cqi (channel Quality indicator); and a transmission circuit configured to repeatedly transmit Uplink Control information including at least the CQI using a plurality of PUCCHs (physical Uplink Control channels) in a plurality of subframes, respectively, and when the Uplink Control information is transmitted in a PUCCH included in a first (initial) subframe of the plurality of subframes, based on whether the Uplink Control information includes HARQ-ACK (Hybrid automatic repeat Request-Acknowledgement), to (i) transmit the Uplink Control information using the PUCCH in a first (first) subframe included in the plurality of subframes and other than the first subframe, or (ii) not transmit the Uplink Control information in the first subframe.
Advantageous effects
According to an aspect of the present invention, a terminal apparatus and a base station apparatus can efficiently perform communication using a plurality of physical channels included in a plurality of subframes.
Drawings
Fig. 1 is a conceptual diagram of a wireless communication system according to the present embodiment.
Fig. 2 is a diagram showing a schematic configuration of a radio frame according to the present embodiment.
Fig. 3 is a table showing an example of UL-DL setting according to the present embodiment.
Fig. 4 is a diagram showing a configuration of a slot according to the present embodiment.
Fig. 5 is a diagram showing an example of a narrow band according to the present embodiment.
Fig. 6 is a diagram showing an example of the search space according to the present embodiment.
Fig. 7 is a diagram showing an example of a DRX cycle according to the present embodiment.
Fig. 8 is a diagram showing an example of the operation related to the end command according to the present embodiment.
Fig. 9 is a flowchart showing an example of the DRX operation of the present embodiment.
Fig. 10 is a flowchart showing an example of the DRX operation of the present embodiment.
Fig. 11 is a diagram showing an example of the operation of the UL HARQ RTT timer according to the present embodiment.
Fig. 12 is a diagram showing an example of the operation of the UL HARQ RTT timer according to the present embodiment.
Fig. 13 is a diagram showing an example of the operation of the UL HARQ RTT timer according to the present embodiment.
Fig. 14 is a diagram showing an example of the operation of the UL HARQ RTT timer according to the present embodiment.
Fig. 15 is a schematic block diagram showing the configuration of the
Fig. 16 is a schematic block diagram showing the configuration of the
Detailed Description
Hereinafter, embodiments of the present invention will be described.
Fig. 1 is a conceptual diagram of a wireless communication system according to the present embodiment. In fig. 1, the wireless communication system includes terminal apparatuses 1A to 1C and a
The present embodiment can be applied only to the
In the present embodiment, the
In the downlink, a carrier corresponding to a serving cell is referred to as a downlink component carrier. In the uplink, a carrier corresponding to a serving cell is referred to as an uplink component carrier. The downlink component carrier and the uplink component carrier are collectively referred to as a component carrier. In FDD, an uplink component carrier and a downlink component carrier correspond to different carrier frequencies. In TDD, the uplink component carrier and the downlink component carrier correspond to the same carrier frequency.
In the downlink, there is one independent HARQ entity (entity) per serving cell (downlink component carrier). The HARQ entity manages a plurality of HARQ processes in parallel. The HARQ process indicates to the physical layer to receive data based on the received downlink grant (downlink control information).
In the downlink, at least one transport block is generated per one or more TTIs (Transmission Time Interval) per serving cell. The transport block and HARQ retransmissions of this transport block are mapped to a serving cell. In LTE, a TTI is a subframe. The transport block in the downlink is data of the MAC layer transmitted through DL-sch (downlink Shared channel).
In the uplink of the present embodiment, "transport block", "MAC PDU (Protocol Data Unit)", "Data of MAC layer", "DL-SCH Data", and "downlink Data" are the same.
The physical channel and the physical signal of the present embodiment will be explained.
One physical channel is mapped to one or more subframes. In the present embodiment, "one physical channel included in a plurality of subframes", "one physical channel mapped to a plurality of subframes", "one physical channel composed of resources of a plurality of subframes", and "one physical channel transferred to a plurality of subframes and repeatedly transmitted" are the same. The number of times of repeated transmission is also referred to as a repetition level.
In uplink wireless communication from the
PUCCH (Physical Uplink Control Channel)
PUSCH (Physical Uplink Shared Channel)
PRACH (Physical Random Access Channel: Physical Random Access Channel)
The PUCCH is used to transmit Uplink Control Information (UCI). The uplink control information includes: the Physical Downlink control Channel (PUSCH) resource may include, for example, CSI (Channel State Information) of a Downlink, a Scheduling ReQuest (SR) for requesting a PUSCH (Uplink-Shared Channel: UL-SCH) resource for initial transmission, and/or HARQ-ACK (Hybrid Automatic Repeat reQuest ACKnowledgement) for Downlink Data (Transport block, Medium access control Protocol Data Unit: MAC PDU (media access control Protocol Data Unit), Downlink-Shared Channel: DL-SCH (Downlink Shared Channel), Physical Downlink Shared Channel: PDSCH (Physical Downlink Shared Channel)). HARQ-ACK means ACK (acknowledgement) or NACK (negative-acknowledgement). HARQ-ACK is also referred to as ACK/NACK, HARQ feedback, HARQ acknowledgement (response), HARQ information, or HARQ control information.
The scheduling request includes a positive scheduling request (positive scheduling request) or a negative scheduling request (negative scheduling request). A positive scheduling request indicates a request for UL-SCH resources for initial transmission. A negative scheduling request indicates that no UL-SCH resource is requested for initial transmission.
The PUSCH is used to transmit Uplink-Shared Channel (UL-SCH). In addition, the PUSCH may also be used to transmit HARQ-ACK and/or channel state information with uplink data. In addition, the PUSCH may also be used to transmit only channel state information. In addition, the PUSCH may also be used to transmit only HARQ-ACK and channel state information. The repetition level of the PUSCH transmission may be shown by the downlink control information (uplink grant).
Here, the
In the present embodiment, "RRC signaling", "information of RRC layer", "signal of RRC layer", "parameter of RRC layer", "RRC message", and "RRC information element" are the same.
The PUSCH is used to transmit RRC signaling and MAC CE. Here, the RRC signaling transmitted from the
The PRACH is used to transmit a random access preamble. The PRACH is used to represent an initial connection establishment (initial connection establishment) procedure, a handover procedure, a connection re-establishment (connection re-establishment) procedure, synchronization (timing adjustment) for uplink transmission, and a request for PUSCH (UL-SCH) resources.
In the uplink wireless communication, the following uplink physical signal is used. The uplink physical signal is not used to transmit information output from an upper layer but is used by a physical layer.
Uplink Reference Signal (Uplink Reference Signal: UL RS)
In downlink wireless communication from the
PBCH (Physical Broadcast Channel)
PCFICH (Physical Control Format Indicator Channel)
PHICH (Physical Hybrid automatic repeat request Indicator Channel)
PDCCH (Physical Downlink Control Channel)
EPDCCH (Enhanced Physical Downlink Control Channel)
MPDCCH (Machine type communication Physical Downlink Control Channel)
PDSCH (Physical Downlink Shared Channel)
PMCH (Physical Multicast Channel: Physical Multicast Channel)
The PBCH is used to Broadcast a Master Information Block (MIB, Broadcast Channel) BCH that is commonly used in the
The PCFICH is used to transmit information indicating a region (OFDM symbol) used for transmission of the PDCCH.
PHICH is used to transmit HARQ indicators (HARQ feedback, acknowledgement information) indicating ack (acknowledgement) or nack (negative acknowledgement) for Uplink Shared Channel (UL-SCH) received by
The PDCCH, the EPDCCH, and the MPDCCH are used to transmit Downlink Control Information (DCI). In the present embodiment, for convenience, the "PDCCH" includes "EPDCCH" and "MPDCCH". The downlink control information is also referred to as a DCI format. The downlink control information transmitted through one PDCCH includes a downlink grant (downlink grant) and HARQ information or an uplink grant (uplink grant) and HARQ information. The downlink grant is also referred to as a downlink assignment or downlink allocation. The downlink assignment and the uplink grant are not transmitted together through one PDCCH.
The downlink assignment is for scheduling of a single PDSCH within a single cell. The downlink assignment is for scheduling of PDSCH within the same subframe as the subframe in which the downlink grant was sent. The downlink assignment may also be used for scheduling of PDSCH included in one or more subframes later than the subframe in which the downlink grant has been transmitted.
The uplink grant is used for scheduling of a single PUSCH within a single cell. The uplink grant may also be used for scheduling of a PUSCH included in 1 or more subframes later than the subframe in which the uplink grant has been transmitted.
CRC (Cyclic Redundancy Check) parity bits attached to downlink control information transmitted through one PDCCH are scrambled by C-RNTI (Cell-Radio Network Temporary Identifier: Cell Radio Network Temporary Identifier), SPS (Semi Persistent Scheduling) C-RNTI, or Temporary C-RNTI. The C-RNTI and the SPS C-RNTI are identifiers for identifying the terminal device within the cell. The template C-RNTI is an identifier for identifying the
The C-RNTI and the Temporary C-RNTI are used for controlling PDSCH transmission or PUSCH transmission of a single subframe. The SPS C-RNTI is used to periodically allocate resources of the PDSCH or PUSCH.
The PDSCH is used to transmit Downlink Shared Channel (DL-SCH).
The PMCH is used to send Multicast data (Multicast Channel: MCH).
In downlink wireless communication, the following downlink physical signals are used. The downlink physical signal is not used to transmit information output from an upper layer but is used by a physical layer.
Synchronizing signal (Synchronization signal: SS)
Downlink Reference Signal (DL RS)
The synchronization signal is used for the
The downlink reference signal is used for the
In the present embodiment, the following five types of downlink reference signals are used.
CRS (Cell-specific Reference Signal: Cell-specific Reference Signal)
URS (UE-specific Reference Signal: user equipment-specific Reference Signal) associated with PDSCH
DMRS (Demodulation Reference Signal) associated with EPDCCH
NZP CSI-RS (Non-Zero Power channel State Information-Reference Signal: Non-Zero Power channel State Information Reference Signal)
ZP CSI-RS (Zero Power channel State Information-Reference Signal: Zero Power channel State Information Reference Signal)
MBSFN RS (Multimedia Broadcast and Multicast Service over Single Frequency Network Reference signal: Multimedia Broadcast/Multicast Service Reference signal on Single Frequency Network)
PRS (Positioning Reference Signal)
The downlink physical channel and the downlink physical signal are collectively referred to as a downlink signal. The uplink physical channel and the uplink physical signal are collectively referred to as an uplink signal. The downlink physical channel and the uplink physical channel are collectively referred to as a physical channel. The downlink physical signal and the uplink physical signal are collectively referred to as a physical signal.
BCH, MCH, UL-SCH, and DL-SCH are transport channels. A channel used in the mac (medium Access control) layer is referred to as a transport channel. The Unit of transport channel used in the MAC layer is also referred to as Transport Block (TB) or MAC PDU (Protocol Data Unit). Harq (hybrid Automatic Repeat request) control is performed for each transport block in the MAC layer. A transport block is a unit of data that the MAC layer forwards (sender) to the physical layer. In the physical layer, a transport block is mapped to a codeword, and encoding processing is performed for each codeword.
A structure (structure) of a radio frame (radio frame) according to the present embodiment will be described.
In LTE, a 2 radio frame structure is supported. The two radio frame structures are
Fig. 2 is a diagram showing a schematic configuration of a radio frame according to the present embodiment. In fig. 2, the horizontal axis is a time axis. Each of the radio frame lengths of
The following three types of subframes are defined for
Downlink subframe
Uplink subframe
Special sub-frames
The downlink subframe is a subframe reserved for downlink transmission. An uplink subframe is a subframe reserved for uplink transmission. The special subframe is composed of 3 fields. The 3 fields are DwPTS (Downlink Pilot time Slot), GP (Guard Period) and UpPTS (Uplink Pilot time Slot). The total length of DwPTS, GP and UpPTS is 1 ms. The DwPTS is a field reserved for downlink transmission. UpPTS is a field reserved for uplink transmission. The GP is a field in which downlink transmission and uplink transmission are not performed. The special subframe may be composed of only DwPTS and GP, or may be composed of only GP and UpPTS.
The radio frame of
The following describes the structure of the slot according to the present embodiment.
Fig. 4 is a diagram showing a configuration of a slot according to the present embodiment. In the present embodiment, a normal cp (normal Cyclic prefix) is applied to the OFDM symbol. Note that an extended Cyclic prefix (extended cp) may be applied to the OFDM symbol. The physical signal or physical channel transmitted in each slot is represented by a resource grid. In fig. 4, the horizontal axis is a time axis, and the vertical axis is a frequency axis. In the downlink, a resource grid is defined by a plurality of subcarriers and a plurality of OFDM symbols. In the uplink, a resource grid is defined by a plurality of subcarriers and a plurality of SC-FDMA symbols. The number of subcarriers constituting one slot depends on the bandwidth of the cell. The number of OFDM symbols or SC-FDMA symbols constituting one slot is 7. Each element within the resource grid is referred to as a resource element. The resource elements are identified using the numbers of the subcarriers and the numbers of the OFDM symbols or the SC-FDMA symbols.
The resource block is used to represent mapping of a certain physical channel (PDSCH, PUSCH, or the like) to resource elements. The resource blocks are defined with virtual resource blocks and physical resource blocks. First, a certain physical channel is mapped to a virtual resource block. Thereafter, the virtual resource blocks are mapped to physical resource blocks. One physical resource block is defined by 12 subcarriers consecutive in the frequency domain from 7 OFDM symbols or SC-FDMA symbols consecutive in the time domain. Therefore, one physical resource block is composed of (7 × 12) resource elements. Further, one physical resource block corresponds to one slot in the time domain and 180kHz in the frequency domain. The physical resource blocks are numbered starting from 0 in the frequency domain.
The narrow band (narrow band) of the present invention will be described below.
Fig. 5 is a diagram showing an example of a narrow band according to the present embodiment. In fig. 5, the horizontal axis is a time axis, and the vertical axis is a frequency axis. In a certain slot, a narrowband consists of 6 consecutive physical resource blocks in the frequency domain. The
In order to switch the narrow band in which the
The search space of the present invention will be explained below. The search space is a set of PDCCH candidates (candidates). The PDCCH candidates are composed of resources of one or more subframes.
The
In the present embodiment, "PDCCH candidates" and "MPDCCH candidates" are the same. In the present embodiment, "set of PDCCH candidates for monitoring", "set of MPDCCH candidates for monitoring", "search space", "PDCCH search space", "MPDCCH search space", "UE-specific (specific) search space", "PDCCH UE-specific (specific) search space", and "MPDCCH UE-specific (specific) search space" are the same.
Fig. 6 is a diagram showing an example of the search space according to the present embodiment.
In fig. 6, 1 search space includes
In a certain slot, the number of resource blocks included in a PDCCH candidate is referred to as the Aggregation Level (AL) of the PDCCH candidate. The aggregation level of the
The number of subframes including one PDCCH candidate is referred to as a Repetition Level (RL) of the PDCCH candidate. The repetition level of
A plurality of PDCCH candidates included in the same search space may be repeated. For example, in fig. 6,
The position (subframe and resource block) of the search space in the time domain and/or the frequency domain may be set by an upper layer. The
The physical channel may not be included in a subframe satisfying a prescribed condition. In the present embodiment, "a plurality of subframes including a physical channel" and "the number of subframes including a physical channel" may be defined in consideration of subframes satisfying the predetermined condition, or may be defined in consideration of subframes satisfying the predetermined condition.
The PDCCH candidate may not be included in the subframe satisfying the prescribed condition. The repetition level of the PDCCH candidate may be defined without considering subframes satisfying the predetermined condition. For example, in a case where a certain PDCCH candidate is included in
The repetition level of the PDCCH candidates may be defined in consideration of subframes satisfying the predetermined condition. For example, when a certain PDCCH candidate is included in
For example, the predetermined condition may include a part or all of the following conditions (a) to (d).
Condition (a): subframes reserved as MBSFN subframes
Condition (b): in TDD, the subframe is an uplink subframe
Condition (c): the subframe is an interval for frequency hopping (guard subframe) applied to a PDCCH candidate
Condition (d): the sub-frame is a part of the set measurement interval
The conditions included in the above-described predetermined conditions are not limited to the conditions (a) to (d), and conditions different from the conditions (a) to (d) may be used, or some of the conditions (a) to (d) may be used.
In the present embodiment, "from the xth subframe" includes the xth subframe. In the present embodiment, "up to the Y-th subframe" includes the Y-th subframe.
Hereinafter, DRX (Discontinuous Reception) according to the present invention will be described.
The DRX function (functionality) is set by an upper layer (RRC) and is handled by the MAC. The DRX function controls PDCCH monitoring activation (activity) of the
That is, the DRX function controls monitoring activation of the
If DRX is set, the
The upper layer (RRC) controls DRX operation by setting the following multiple timers and values of drxStartOffset. Whether or not drxShortCycleTimer and shortDRX-Cycle are set is arbitrary (optional) for the upper layer (RRC).
onDurationTimer: duration timer
Drx-inactivytytimer: non-continuous receiving deactivation timer
Drx-retransmission timer: discontinuous reception retransmission timer (one for each downlink HARQ process except for the downlink HARQ process for the broadcast process)
Drx-ulretransfissiontimer: discontinuous reception uplink retransmission timer (one for each uplink HARQ process)
longDRX-Cycle: long discontinuous reception period
HARQ RTT (Round Trip Time) timer (one for each downlink HARQ process)
UL HARQ RTT (Round Trip Time) timer (one for each uplink HARQ process)
drxShortCycleTimer (optional)
shortDRX-Cycle (optional)
In the present embodiment, the downlink HARQ process and the uplink HARQ process are asynchronous HARQ processes. That is, in the present embodiment, the HARQ operations of the downlink and the uplink are not synchronized.
The
The
The longDRX-Cycle and shortDRX-Cycle are also collectively referred to as DRX cycles.
The onDurationTimer indicates the number of PDCCH subframes that continue from the beginning of the DRX cycle.
drx-inactivity timer indicates the number of consecutive PDCCH subframes after the subframe to which the PDCCH indicating the initial transmission of the uplink data or the downlink data to the
drx-retransmission timer indicates the maximum number of consecutive PDCCH subframes for downlink retransmission waiting by
drx-ulretransmission timer denotes the maximum number of consecutive PDCCH subframes until an uplink grant for uplink retransmission is received. The same value of drx-ulretransmission timer is applied to all serving cells.
The DRX cycle denotes a repetition period of Duration (On Duration). After the period of the duration, a period of inactivity (inactivity) for PDCCH monitoring of the
Fig. 7 is a diagram showing an example of a DRX cycle according to the present embodiment. In fig. 7, the horizontal axis is a time axis. In fig. 7, in a period P2200 of the duration, the
drxShortCycleTimer indicates the number of consecutive subframes of the
drxStartOffset represents the subframe in which the DRX cycle is started.
The HARQ RTT timer corresponding to the downlink HARQ process is managed for each downlink HARQ process in association with the start of the drx-retransmission timer. The HARQ RTT timer corresponding to the downlink HARQ process indicates the shortest interval from transmission of downlink data to retransmission of the downlink data. That is, the HARQ RTT timer corresponding to the downlink HARQ process represents the minimum amount of subframes before waiting for downlink HARQ retransmission by
In the present embodiment, one downlink HARQ process controls HARQ of one downlink data (transport block). It should be noted that one downlink HARQ process may also control two downlink data.
The UL HARQ RTT timer corresponding to the uplink HARQ process is managed for each uplink HARQ process in association with the start of the drx-UL retransmission timer. The UL HARQ rtt timer corresponding to the uplink HARQ process indicates the shortest interval from the transmission of uplink data until the retransmission of the uplink data. That is, the UL HARQ RTT timer corresponding to the uplink HARQ process indicates the number of subframes (amount) before the
For example, in the case where the DRX cycle is set, the Active Time (Active Time) may include a period in which at least one of the following conditions (e) to (l) is satisfied.
Condition (e): the onDurationTimer, drx-InactivityTimer, drx-RecransmissionTimer, or mac-ContentionResolutionTimer are running
Condition (f): sending scheduling request over PUCCH and pending
Condition (g): an uplink grant for a pending HARQ retransmission may be sent for synchronous HARQ and data may be present in the corresponding HARQ buffer
Condition (h): after successful reception of the random access response to the preamble that has not been selected by the
Condition (i):
Condition (j): in a period for which PUSCH transmission is set when
Condition (k): the
Condition (l): the transmission interval is set to a value at which the
The conditions for determining whether or not a certain period is included in the activation time are not limited to the conditions (e) to (l), and conditions different from the conditions (e) to (l) may be used, or a part of the conditions (e) to (l) may be used.
When a timer is started once, it runs until the timer is stopped or expires. Otherwise, the timer is not running. If the timer is not running, the timer may be started. If the timer runs, the timer may be restarted. The timer is always started or restarted from its initial value.
The preamble is a
The random access response is
The
The mac-ContentionResolutionTimer indicates the number of consecutive subframes in which the
The
The end command is used to indicate the end of PUSCH transmission (repeated transmission of PUSCH). The
The end command may include at least a part or all of the following.
·ACK
Downlink control information (uplink grant and/or downlink assignment)
Downlink control information (uplink grant and/or downlink assignment) comprising a field of multiple information set to a specific value
The plurality of fields set to the specific value may include at least a part or all of a field of information (TPC command for scheduled PUSCH) related to a TPC command for a scheduled PUSCH, a field of information (Cyclic shift DMRS) related to a Cyclic shift for a DMRS, and a field of information (Modulation and coding scheme and redundancy version) related to an MCS and a redundancy version.
The field of the information (TPC command for scheduled PUSCH) on the TPC command for the PUSCH set to a specific value may be a field of the information (TPCcommand for scheduled PUSCH) on the TPC command for the PUSCH set to '11'. The field of information on the Cyclic shift DMRS for the DMRS set to a specific value (Cyclic shift DMRS) may be a field of information on the Cyclic shift DMRS for the DMRS set to "111".
For a
The end command may be included in the PDCCH. The end command may be appended with CRC parity bits scrambled by the C-RNTI or SPS C-RNTI.
Fig. 8 is a diagram showing an example of the operation related to the end command according to the present embodiment. In fig. 8, PDCCH220 includes an uplink grant for scheduling PUSCH 230. The PUSCH transmission 230 is discontinuous in the time domain. The PUSCH transmission 230 includes PUSCH transmission 230A and PUSCH transmission 230B.
In fig. 8,
Fig. 9 and 10 are flowcharts showing an example of the DRX operation according to the present embodiment. When DRX is set, the
When the HARQ RTT timer corresponding to the downlink HARQ process in the subframe expires and the data of the HARQ process corresponding to the HARQ RTT timer is not successfully decoded (S804), the
If the UL HARQ RTT timer corresponding to the uplink HARQ process in the subframe expires (S802),
If the DRX command MAC CE is received (S804), the
If DRX-inactivity timer expires or a DRX command MAC CE is received in the subframe (S808), the
If the short DRX Cycle (shortDRX-Cycle) is not set (S810), the
If drxShortCycleTimer expires in this subframe (S816), the
(1) If the short DRX Cycle is used and [ (SFN x 10) + subframe number ] module (shortDRX-Cycle) (drxStartOffset) module (shortDRX-Cycle) is used, or (2) the long DRX Cycle is used and [ (SFN x 10) + subframe number ] module (longDRX-Cycle) ═ drxStartOffset (S900), the
When all of the following conditions (m) to (q) are satisfied (S904), the
Condition (m): the sub-frame is included in the period of the activation time
Condition (n): the subframe is a PDCCH subframe
Condition (o): this subframe does not require uplink transmission of
Condition (p): the subframe is not a half-duplex protected subframe
Condition (q): the subframe is not a part of the set measurement interval (measurement gap)
For one FDD serving cell, all subframes are PDCCH subframes. The
Half-duplex FDD operation includes type a half-duplex FDD operation and type B half-duplex FDD operation. The
For type a half duplex FDD operation, the
For the type B half-duplex FDD operation, a subframe immediately before a subframe in which the
For type B half duplex FDD operation, the
The measurement interval is a time interval for the
If at least one of the conditions (m) to (q) is not satisfied (S904), the
The conditions used in S904 are not limited to the conditions (m) to (q), and conditions different from the conditions (m) to (q) may be used in S904, or some of the conditions (m) to (q) may be used.
If the downlink assignment received via the PDCCH indicates downlink transmission or a downlink assignment is set for the subframe (S908), the
The state in which the downlink assignment is set means a state in which semi-persistent scheduling is activated by downlink assignment accompanied by SPS C-RNTI.
When the uplink grant received via the PDCCH indicates uplink transmission or an uplink grant is set in the subframe (S912), the
The state in which the uplink grant is set refers to a state in which semi-persistent scheduling is activated by the uplink grant accompanied by SPS C-RNTI.
If the end command is not received (S916), the
The "no reception of the end command" may be "instructed to end the uplink transmission" or "the PDCCH instructs the end of the PUSCH transmission". Upon receiving the end command, the physical layer of the
If the downlink assignment or the uplink grant received via the PDCCH indicates initial transmission of the downlink or uplink (S920), the
Fig. 11 to 14 are diagrams showing an example of the operation of the UL HARQ RTT timer according to the present embodiment. In fig. 11 to 14, P100 denotes a period in which the onDurationTimer operates, P110 denotes a period in which the drx-inactivity timer operates, P115 denotes a supervision subframe, P120 denotes a period in which the UL HARQ RTT timer operates, and P130 denotes a period in which the drx-ulretransmission timer operates.
In fig. 11, the
In fig. 12 to 14, the
In fig. 12,
In fig. 13,
In fig. 14,
The UL HARQ RTT timer is not started in the next subframe to the last subframe of the PUSCH transmission 230A that is actually transmitted.
The following describes the structure of the apparatus according to the present embodiment.
Fig. 15 is a schematic block diagram showing the configuration of the
The upper
The mac
The mac
The radio resource control
The
The RF unit 12 converts (down converts) the signal received via the
The
The
The RF unit 12 removes an unnecessary frequency component from the analog signal input from the
Fig. 16 is a schematic block diagram showing the configuration of the
The upper layer processing unit 34 performs processing of a Medium Access Control (MAC) layer, a Packet Data Convergence Protocol (PDCP) layer, a Radio Link Control (RLC) layer, and a Radio Resource Control (RRC) layer.
The mac layer processing unit 35 included in the upper layer processing unit 34 performs mac layer processing. The mac
The radio resource control layer processing unit 36 included in the upper layer processing unit 34 performs processing of the radio resource control layer. The radio resource Control layer processing unit 36 generates or acquires downlink data (transport block) mapped to the physical downlink shared channel, system information, RRC message, MAC CE (Control Element), and the like from an upper node, and outputs the downlink data, the system information, the RRC message, the MAC CE (Control Element), and the like to the radio transmitting/receiving unit 30. The radio resource control layer processing unit 36 manages various configuration information and parameters of each
Since the function of the wireless transmission/reception unit 30 is the same as that of the wireless transmission/
Each portion in fig. 14 and 15 may be configured as a circuit. For example, the mac layer processing unit may be configured as a mac layer processing unit loop. Each unit in fig. 14 and 15 may be configured as at least one processor and a memory connected to the at least one processor.
Hereinafter, various aspects of the terminal apparatus and the base station apparatus according to the present embodiment will be described.
(1) In a first aspect of the present embodiment, a
(2) In a first aspect of this embodiment, the UL HARQ RTT timer is started in a subframe containing the last repetition of the uplink transmission.
(3) In a second aspect of the present embodiment, a
at least one processor; and a memory coupled to the at least one processor, the at least one processor configured to: (i) attempting decoding of a PDCCH during an activation time if intermittent reception is set, (ii) performing uplink transmission in a plurality of subframes including a first subframe including a last repetition of the uplink transmission if the PDCCH indicates the uplink transmission for a HARQ process and is not indicated for end of the uplink transmission, (ii) ending the uplink transmission in a second subframe preceding the first subframe and starting an UL HARQ RTT timer for the HARQ process in the first subframe if the PDCCH indicates the uplink transmission for the HARQ process and is indicated for end of the uplink transmission.
This enables the
The program that operates in the
Note that part of the
Note that the "computer system" referred to herein is a computer system built in the
Also, the "computer-readable recording medium" may also include: a recording medium that dynamically stores a program in a short time such as a communication line when the program is transmitted via a network such as the internet or a communication line such as a telephone line; and a recording medium for storing a program for a fixed time, such as a volatile memory in a computer system serving as a server or a client in this case. The program may be a program for realizing a part of the above-described functions, or may be a program that can realize the above-described functions by being combined with a program recorded in a computer system.
The
In addition, the
In addition, a part or all of the
In the above-described embodiments, the terminal device is described as an example of the communication device, but the invention of the present application is not limited to this, and can be applied to fixed or non-movable electronic devices installed indoors and outdoors, for example, terminal devices or communication devices such as AV equipment, kitchen equipment, cleaning/washing equipment, air conditioning equipment, office equipment, vending machines, and other living equipment.
While the embodiments of the present invention have been described in detail with reference to the drawings, the specific configurations are not limited to the embodiments, and design changes and the like are included without departing from the scope of the present invention. Further, one aspect of the present invention can be variously modified within the scope shown in the claims, and embodiments obtained by appropriately combining the claims disclosed in the respective different embodiments are also included in the technical scope of the present invention. The present invention also includes a configuration in which elements having similar effects to those described in the above embodiments are replaced with each other.
Industrial applicability of the invention
One aspect of the present invention can be used for, for example, a communication system, a communication device (for example, a portable telephone device, a base station device, a wireless LAN device, or a sensor device), an integrated circuit (for example, a communication chip), a program, or the like.
Description of the symbols
1(1A, 1B, 1C) terminal device
3 base station device
10 wireless transmitting/receiving part
11 antenna part
12 RF part
13 base band part
14 upper layer processing part
15 media access control layer processing part
16 radio resource control layer processing unit
30 wireless transmitting/receiving part
31 antenna part
32 RF part
33 base band part
34 upper layer processing part
35 media access control layer processing part
36 radio resource control layer processing unit
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