WO2014069105A1 - 通信制御装置、通信制御方法、端末装置、プログラム及び通信制御システム - Google Patents
通信制御装置、通信制御方法、端末装置、プログラム及び通信制御システム Download PDFInfo
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- WO2014069105A1 WO2014069105A1 PCT/JP2013/074371 JP2013074371W WO2014069105A1 WO 2014069105 A1 WO2014069105 A1 WO 2014069105A1 JP 2013074371 W JP2013074371 W JP 2013074371W WO 2014069105 A1 WO2014069105 A1 WO 2014069105A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1829—Arrangements specially adapted for the receiver end
- H04L1/1854—Scheduling and prioritising arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1829—Arrangements specially adapted for the receiver end
- H04L1/1861—Physical mapping arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
- H04L5/1469—Two-way operation using the same type of signal, i.e. duplex using time-sharing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
- H04L5/0055—Physical resource allocation for ACK/NACK
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
- H04L5/1438—Negotiation of transmission parameters prior to communication
Definitions
- the present disclosure relates to a communication control device, a communication control method, a terminal device, a program, and a communication control system.
- the LTE scheme is classified into an FD-LTE scheme and a TD-LTE scheme based on the difference in duplex scheme.
- the FD-LTE system adopts frequency division duplex (FDD) as a duplex system, and uplink and downlink are operated on different frequency bands.
- the TD-LTE scheme adopts Time Division Duplex (TDD) as a duplex scheme, and uplink and downlink are operated on the same frequency band.
- FDD frequency division duplex
- TDD Time Division Duplex
- Both the FD-LTE method and the TD-LTE method use a frame format in which one radio frame (having a time length of 10 msec) is configured from 10 subframes each having a time length of 1 msec. While the link direction does not change temporally in the same frequency band in the FD-LTE scheme, the link direction may change in units of subframes in the TD-LTE scheme.
- Non-Patent Document 1 a set of link directions on a subframe basis (that is, a combination of link directions of ten subframes) for each radio frame is referred to as a link direction configuration (or UL-DL configuration).
- the radio base station eNB in the LTE system
- the terminal apparatus UE in the LTE system
- SIB 1 System Information Block Type 1
- the cycle of link direction configuration update performed using SIB1 is 640 msec.
- Non-Patent Document 2 proposes reducing this period to 320 msec.
- Non-Patent Document 3 proposes a method of dynamically changing the timing of ACK / NACK or uplink grant when it is determined that a collision in the link direction occurs.
- a communication control apparatus for controlling wireless communication performed by a terminal device in accordance with a time division duplex (TDD) scheme in a wireless communication network, wherein the wireless communication is performed for each frame including a plurality of subframes.
- a setting unit configured to set a link direction configuration representing a link direction in units of subframes for communication, wherein the setting unit is configured to set the first in wireless communication without depending on the set link direction configuration;
- a communication control apparatus is provided for setting timing of control signaling in a second link direction opposite to the first link direction, which is associated with data transmission in the second link direction.
- a communication control method for controlling wireless communication performed by a terminal device in accordance with a time division duplex (TDD) scheme in a wireless communication network, wherein each frame including a plurality of subframes is Setting a link direction configuration representing a link direction in units of subframes for the wireless communication; and transmitting data in a first link direction in the wireless communication without depending on the set link direction configuration.
- TDD time division duplex
- the communication control method comprising:
- a computer of a communication control apparatus that controls wireless communication performed by a terminal device in accordance with a time division duplex (TDD) scheme in a wireless communication network, for each of a frame including a plurality of subframes,
- a program that functions as a setting unit configured to set a link direction configuration representing a link direction in units of subframes for the wireless communication, wherein the setting unit does not depend on the set link direction configuration.
- a program is provided for setting timing of control signaling in a second link direction opposite to the first link direction, which is associated with data transmission in a first link direction in the wireless communication.
- a plurality of subframes are configured according to a wireless communication unit that communicates with a base station in a time division duplex (TDD) mode, and a link direction configuration indicated by the first signaling from the base station.
- a controller configured to set a link direction in units of subframes for each of the included frames, the controller configured to transmit data transmission timing in the first link direction and the first link associated with the data transmission.
- a terminal apparatus is provided which sets an offset between control signaling timing of a second link direction opposite to the direction based on second signaling from the base station.
- a wireless communication method executed by a terminal apparatus provided with a wireless communication unit that communicates with a base station in a time division duplex (TDD) mode, and by a first signaling from the base station.
- TDD time division duplex
- a terminal apparatus provided with a wireless communication unit that communicates with a base station in a time division duplex (TDD) mode, and by a first signaling from the base station.
- TDD time division duplex
- a computer of a terminal device provided with a wireless communication unit that communicates with a base station in a time division duplex (TDD) mode according to a link direction configuration indicated by the first signaling from the base station
- a control unit configured to function as a control unit that sets a link direction in units of subframes for each frame including a plurality of subframes, wherein the control unit is configured to transmit data in a first link direction
- the program provides for setting an offset between the timing of control signaling in a second link direction opposite to the first link direction associated with data transmission based on a second signaling from the base station Be done.
- a communication control system including a terminal device that communicates with a base station in a time division duplex (TDD) mode, and a communication control device that controls wireless communication performed by the terminal device.
- the communication control apparatus includes: a setting unit configured to set a link direction configuration representing a link direction in units of subframes for the wireless communication, for each of the frames including a plurality of subframes; Timing of control signaling in a second link direction opposite to the first link direction, associated with data transmission in the first link direction in the wireless communication, without depending on the set link direction configuration
- a communication control system is provided to set
- FIG. 1 is an explanatory diagram for describing an example of link direction configuration in TD-LTE.
- a frame format of a radio frame adopted in the LTE scheme is shown.
- One radio frame (radio frame) includes ten subframes (# 0 to # 9).
- the time length of each subframe is 1 msec, and the time length of one radio frame is 10 msec.
- the link direction is set in units of subframes.
- the link direction of the sub-frame labeled "D" is a downlink
- the sub-frame is referred to as a downlink sub-frame.
- the link direction of the sub-frame labeled "U” is the uplink, and the sub-frame is called an uplink sub-frame.
- the subframes labeled "S" are special subframes specific to TD-LTE.
- the downlink signal transmitted from the base station (eNB) arrives at the terminal equipment (UE) with a delay dT.
- the terminal transmits the uplink signal prior to the timing of the uplink subframe of the base station, taking into account the delay dT of the uplink signal arriving at the base station.
- the special subframe is inserted at the timing of switching from the downlink subframe to the uplink subframe, as a buffering period so that the timing of reception of the downlink signal and transmission of the uplink signal at the terminal do not overlap.
- the special subframe includes a downlink pilot time slot in which the downlink signal is received by the UE, a guard period (Guard Period), and an uplink pilot time slot in which the uplink signal is transmitted by the UE.
- downlink data may be transmitted from the base station to the terminal device also in the special subframe. In that sense, the special subframe can also be regarded as a kind of downlink subframe.
- FIG. 2 shows a list of seven types of link direction configurations that can be configured in TD-LTE, as defined in Non-Patent Document 1.
- the 0th subframe (# 0) and the 5th subframe (# 5) are set as downlink subframes in any configuration.
- the first subframe (# 1) is set as a special subframe in any configuration.
- the second subframe (# 2) is set as an uplink subframe in any configuration.
- the settings for the remaining subframes are different for each configuration.
- the composition ratio (UL-DL composition ratio) of the number of uplink subframes to the number of downlink subframes is shown.
- the number of uplink subframes is 6, the number of downlink subframes is 2, and the UL-DL configuration ratio is 6: 2.
- the number of uplink subframes is four, the number of downlink subframes is four, and the UL-DL configuration ratio is 4: 4.
- the number of uplink subframes is 2, the number of downlink subframes is 6, and the UL-DL configuration ratio is 2: 6.
- the number of uplink subframes is 3, the number of downlink subframes is 6, and the UL-DL configuration ratio is 3: 6.
- the number of uplink subframes is 2, the number of downlink subframes is 7, and the UL-DL configuration ratio is 2: 7.
- the number of uplink subframes is one, the number of downlink subframes is eight, and the UL-DL configuration ratio is 1: 8.
- the number of uplink subframes is 5, the number of downlink subframes is 3, and the UL-DL configuration ratio is 5: 3.
- a wireless communication system operating according to the TD-LTE scheme may determine which of seven link direction configurations to use based on the UL-DL traffic ratio.
- the uplink signal is buffered by the terminal's uplink buffer before transmission is allowed.
- downlink signals are buffered by the P-GW (PDN Gateway) in the core network before transmission is scheduled.
- P-GW PDN Gateway
- the terminal device periodically transmits a buffer status report indicating the amount of uplink traffic waiting for a buffer to the base station.
- the P-GW provides buffer signaling that indicates the amount of downlink traffic waiting for buffer.
- a scheduler in the base station or other control node can calculate the UL-DL traffic ratio for each cell.
- uplink traffic waiting for buffer is larger than downlink traffic waiting for buffer.
- uplink traffic waiting for a buffer can be reduced by setting a link direction configuration with a high uplink rate.
- downlink traffic waiting for buffer is larger than uplink traffic waiting for buffer. In this case, it is possible to reduce downlink traffic waiting for a buffer by setting a link direction configuration with a high downlink rate.
- the link direction configuration set by the base station or other control node is signaled by broadcast from the base station to the terminal using SIB1.
- the update period of SIB1 in the current standard specification is 640 msec.
- the cycle of the link direction configuration update using SIB1 can be shortened to 320 msec.
- the SIB 1 is one of various types of SIB (System Information Block) mapped to the DL-SCH (Downlink Shared Channel).
- the message carrying the SIB is called an SI (System Information) message.
- the shortest transmission cycle of the SI message is 80 msec. Therefore, as long as the link direction configuration is signaled in the SI message, the update period of the link direction configuration is a minimum of 80 msec.
- a new message different from the SI message is introduced to signal the link direction configuration to the terminal device in a shorter cycle than the existing method.
- the new message introduced is referred to herein as a Dynamic Configuration (DC) message.
- a terminal that receives only an SI message for setting a link direction configuration is referred to as a legacy terminal (legacy UE).
- a terminal apparatus that receives a DC message is called a dynamic TDD terminal (dynamic TDD UE).
- FIG. 4 is an explanatory diagram for describing signaling of link direction configuration using a DC message.
- the upper part of FIG. 4 shows that the legacy terminal periodically receives an SI message carrying SIB1 at period C1.
- the SIB 1 includes an identifier (one of the configuration numbers 0 to 6 illustrated in FIG. 2) of the link direction configuration currently set for the legacy terminal.
- the legacy terminal sets the link direction of its wireless communication circuit in subframe units.
- the signaling period C1 of the SI message is, for example, 320 msec.
- the UL-DL traffic ratio greatly fluctuates 20 msec after the reception of the SI message, the link direction configuration and UL-- which have been set over the 300 msec period until the next SI message is received The mismatch between the DL traffic ratio continues.
- the lower part of FIG. 4 shows that the dynamic TDD terminal periodically receives a DC message in a cycle C2 ( ⁇ C1).
- the DC message includes an identifier (any of configuration numbers 0 to 6 illustrated in FIG. 2) of the link direction configuration currently configured for the dynamic TDD terminal.
- the dynamic TDD terminal sets the link direction of its wireless communication circuit in subframe units.
- the base station signals the first link direction configuration to legacy terminals using SI messages and signals the second link direction configuration to dynamic TDD terminals using DC messages.
- the first link direction configuration that can be updated with the cycle C1 is referred to as a legacy configuration.
- the second link direction configuration is referred to as a dynamic TDD configuration.
- the base station may transmit a DC message without waiting for the elapse of the signaling cycle when a predetermined event such as a new connection of the dynamic TDD terminal or return to the active mode occurs.
- signaling to legacy terminals using SI messages may be omitted.
- the technology according to the present disclosure is also applicable to a system in which there is no legacy terminal whose compatibility is to be guaranteed, and in which only the configuration for dynamic TDD that can be updated in a short cycle is signaled.
- the collision in the link direction results in the loss of data transmission or control signaling at the timing of collision occurrence, which reduces the throughput of communication.
- Non-Patent Document 3 two cases described in Non-Patent Document 3 will be described.
- ACK / NACK for downlink transmission Acknowledgment (ACK) and non-acknowledgement (NACK) are basic control signaling based on HARQ (Hybrid Automatic Repeat Request), which is a mechanism for securing the reliability of data transmission.
- HARQ Hybrid Automatic Repeat Request
- the offset between downlink transmission timing and ACK / NACK timing is defined for each link direction configuration in Table 10.1.3.1-1 of 3GPP TS 36.213 (see Table 1).
- Table 1 shows the offset of the timing between downlink transmission and ACK / NACK associated with the downlink transmission in units of subframe number.
- the transmission timing of ACK / NACK will be described also with reference to FIG.
- two continuous radio frames F11 and F12 in which Configuration 3 is set are shown.
- downlink transmission may occur in the 0th, 1st, 5th, 6th, 7th, 8th and 9th subframes.
- an ACK / NACK for downlink transmission in the 0th subframe may be transmitted in the 4th subframe indicating Offset 4.
- the ACK / NACK for downlink transmission in the first subframe may be sent in the second subframe (of the next radio frame) indicating offset 11.
- the ACK / NACK for downlink transmission in the fifth subframe may be sent in the second subframe (of the next radio frame) indicating offset 7.
- the ACK / NACK for downlink transmission in the sixth subframe may be sent in the second subframe (of the next radio frame) indicating offset 6.
- the ACK / NACK for the downlink transmission in the seventh subframe may be sent in the third subframe (of the next radio frame) indicating offset 6.
- the ACK / NACK for downlink transmission in the eighth subframe may be sent in the third subframe (of the next radio frame) indicating offset 5.
- the ACK / NACK for downlink transmission in the ninth subframe may be sent in the fourth subframe (of the next radio frame), which indicates offset 5.
- Such a correspondence relationship of timing is shown by dotted arrows in FIG.
- An apparatus involved in wireless communication may pre-store a specified table as shown in Table 1 and may determine the transmission timing of ACK / NACK for downlink transmission by referring to the table.
- the terminal device is specified by the above table with ACK / NACKs for downlink transmission in the seventh, eighth and ninth subframes of the radio frame F21 and the 0th subframe of the radio frame F22. Can not be transmitted in the third and fourth subframes of the radio frame F22. If the ACK / NACK is lost, the base station can not recognize the corresponding downlink transmission even if it has been performed properly, and may retransmit the transmitted data. This wastes radio resources and can reduce system throughput.
- (2) UL grant prior to uplink transmission UL grant (Uplink Grant) is control signaling for notifying a terminal apparatus that uplink transmission has been scheduled.
- the timing offset between uplink transmission and UL grant is defined for each link direction configuration in Table 8-2 of 3GPP TS 36.213 (see Table 2).
- Table 2 shows the timing offset between uplink transmission and UL grant associated with the uplink transmission in units of subframe number. While Table 1 shows the backward (past) offset based on the ACK / NACK transmission timing, Table 2 shows the forward (future) reference based on the UL grant transmission timing. The offset is shown.
- the UL grant transmission timing will be described with reference to FIG. Two consecutive radio frames F31 and F32 for which Configuration 4 is set are shown in the upper part of FIG. In radio frames F31 and F32, uplink transmission may occur in the second and third subframes. Referring to the Configuration 4 line of Table 2, the UL grant for uplink transmission in the second subframe may be sent in the eighth subframe (of the previous radio frame), which indicates offset 4.
- the UL grant for uplink transmission in the third subframe may be sent in the ninth subframe (of the previous radio frame), which indicates offset 4.
- the correspondence of such timing is shown by the dotted arrow in FIG.
- a device involved in wireless communication may pre-store a specified table such as Table 2 and may determine the transmission timing of UL grant for uplink transmission by referring to the table.
- Non-Patent Document 3 proposes some solutions to the above-mentioned problems in the situation where the link direction configuration is updated in a short cycle.
- the solutions are to postpone or accelerate the timing of control signaling (ACK / NACK or UL grant), etc., both requiring the determination of collisions in the link direction and separate changes in the timing of control signaling.
- the technology according to the present disclosure provides an improved mechanism capable of preventing a decrease in throughput due to a link direction collision in a situation where link direction configuration is updated in a short cycle while avoiding these disadvantages. Do.
- the synchronization operation of the terminal device includes basic synchronization and synchronization tracking.
- Basic synchronization refers to synchronization from a state in which the operation timing of the terminal apparatus is not synchronized at all with the operation timing of the base station.
- Basic synchronization is performed by the terminal device searching for PSS (Primary Synchronization Signal) and SSS (Secondary Synchronization Signal).
- PSS Primary Synchronization Signal
- SSS Secondary Synchronization Signal
- the terminal device acquires the cell ID of the connected cell through basic synchronization, and knows the rough timing of the radio frame.
- Synchronization tracking is performed to improve synchronization accuracy after basic synchronization is completed.
- the synchronization tracking is performed by the terminal device receiving a CRS (Cell-specific Reference Symbol). As illustrated in FIG.
- the CRSs are distributedly inserted in PDCCH (Physical Downlink Control Channel) and PDSCH (Physical Downlink Shared Channel) of each downlink subframe.
- the terminal device receives the CRSs of these downlink subframes in both the idle mode (RRC_Idle) and the active mode (RRC_Connected), regardless of whether there is data destined for itself or not. Keep in sync.
- the downlink subframe is set to a MBMS Single Frequency Network (MBSFN) subframe
- the PDSCH of the downlink subframe is used only for broadcasting or multicasting of Multimedia Broadcast Multicast Services (MBMS) signals.
- MBSFN Multimedia Broadcast Multicast Services
- Configuration 2 is configured as a configuration for legacy
- Configuration 4 is configured as a configuration for dynamic TDD (see FIG. 2). Since the base station operates according to the dynamic TDD configuration, the link direction of the third subframe (# 3) is uplink and the link direction of the seventh subframe (# 7) is downlink. However, according to the legacy configuration, the legacy terminal recognizes that the link direction of the third subframe is downlink and the link direction of the seventh subframe is uplink. The legacy terminal then attempts to receive CRS for synchronization tracking in the third subframe. However, the base station does not transmit CRS in that subframe, which is actually an uplink subframe.
- the base station transmits a CRS, but the legacy terminal does not receive the CRS.
- the impact of the link direction collision of the seventh subframe is small because the accuracy of synchronization tracking of legacy terminals is not degraded.
- the impact of link direction collisions between such two configurations may also be avoided or mitigated.
- FIG. 8 is an explanatory view showing an example of the configuration of the communication control system 1 according to an embodiment of the technology according to the present disclosure.
- communication control system 1 includes base station 100.
- the base station (eNB) 100 provides a radio communication service to the legacy terminal 104 and the dynamic TDD terminal 200 located inside the cell 102 according to the TD-LTE scheme.
- the base station 100 is connected to a core network 106 typically implemented as an EPC (Evolved Packet Core).
- the core network 106 includes various control nodes such as, for example, an MME (Mobility Management Entity), an S-GW (Serving Gateway), and a P-GW.
- MME Mobility Management Entity
- S-GW Serving Gateway
- P-GW Packet Gateway
- the legacy terminal 104 is a terminal device that operates according to the legacy configuration.
- the dynamic TDD terminal 200 is a terminal device capable of operating according to the configuration for dynamic TDD.
- the dynamic TDD terminal 200 may additionally be able to operate according to the legacy configuration.
- the control function of setting the link direction configuration and performing control signaling for the terminal may be located in the base station 100 or any control node in communication with the terminal via the base station 100. In the following description, as an example, it is assumed that the base station 100 has the control function.
- the base station 100 sets a legacy configuration for the legacy terminal 104. Also, the base station 100 sets up a configuration for dynamic TDD for the dynamic TDD terminal 200. The configuration for dynamic TDD can be updated in a time interval shorter than the signaling period of the configuration for legacy. Furthermore, the base station 100 can control the timing of control signaling in the second link direction (UL or DL) associated with data transmission in the first link direction (DL or UL) without depending on the configuration for dynamic TDD.
- Set Control signaling here may include one or both of an ACK / NACK associated with downlink transmission and a UL grant associated with uplink transmission. Then, the base station 100 performs several types of signaling based on these settings.
- FIG. 9A is an explanatory diagram for describing a first example of new signaling that can be introduced in the present embodiment.
- base station 100 performs signaling SIG0 towards legacy terminal 104 and signaling SIG1 and signaling SIG2 towards dynamic TDD terminal 200.
- the signaling SIG0 is an SI message for notifying the legacy terminal 104 of the configuration for legacy.
- Signaling SIG1 is a dynamic configuration (DC) message that notifies the dynamic TDD terminal 200 of the configuration for dynamic TDD.
- Signaling SIG2 is a new message notifying the dynamic TDD terminal 200 of transmission timing of ACK / NACK associated with downlink transmission.
- the dynamic TDD terminal 200 recognizes an offset between a downlink subframe in which downlink transmission is performed and an uplink subframe to transmit ACK / NACK based on the received signaling SIG2.
- FIG. 9B is an explanatory diagram for describing a second example of new signaling that can be introduced in the present embodiment.
- base station 100 performs signaling SIG0 towards legacy terminal 104 and signaling SIG1 and signaling SIG3 towards dynamic TDD terminal 200.
- signaling SIG3 is a new message notifying the dynamic TDD terminal 200 of transmission timing of uplink transmission associated with UL grant.
- the dynamic TDD terminal 200 recognizes an offset between the downlink subframe in which the UL grant is received and the uplink subframe in which the uplink transmission is granted based on the signaling SIG3.
- FIG. 9C is an explanatory diagram for describing a third example of new signaling that can be introduced in the present embodiment.
- the base station 100 performs signaling SIG0 towards the legacy terminal 104 and signaling SIG1, SIG2 and SIG3 towards the dynamic TDD terminal 200.
- the signaling SIG2 and SIG3 it is sufficient for the signaling SIG2 and SIG3 to be transmitted to the dynamic TDD terminal 200 only once, as long as the timing of control signaling is not changed. Triggering of the signaling SIG2 and SIG3 is, for example, a new connection (including a handover from another system) of the dynamic TDD terminal 200 to the base station 100, or a return of the dynamic TDD terminal 200 from the idle mode to the active mode. You may
- the base station 100 designates one of the set of configuration candidates in each of the signaling SIG0 to SIG3.
- the set of configuration candidates may typically include Configuration 0 to Configuration 6 illustrated in FIG.
- the set of configuration candidates may be specific to the wireless communication network, in which case some link direction configurations may be excluded from the set of configuration candidates.
- a configuration candidate with a higher uplink rate may be designated as a configuration for legacy.
- Configuration0 with the highest uplink rate is designated as the configuration for legacy
- the legacy terminal 104 recognizes the zeroth and fifth subframes as downlink subframes. And, even if the base station 100 operates according to any other configuration, the 0th and 5th subframes are maintained in the downlink subframes. Therefore, since the base station 100 transmits a CRS in a subframe in which the legacy terminal 104 attempts to receive a CRS, it can be ensured that synchronization tracking is properly performed by the legacy terminal 104.
- a configuration candidate selected according to the ratio between uplink traffic and downlink traffic in the network (UL-DL traffic ratio) is designated as a configuration for dynamic TDD.
- the set of configuration candidates includes only Configuration 0 to Configuration 2
- Configuration 0 may be designated when the ratio of uplink traffic is higher.
- Configuration 2 may be specified when the downlink traffic rate is higher.
- Configuration 1 may be specified.
- the monitoring of the UL-DL traffic ratio may be performed, for example, at time intervals of one to several radio frames (ie, 10 to several tens of msec).
- the configuration for dynamic TDD may be selected based on the prediction of future UL-DL traffic ratio.
- the signaling SIG2 notifies the dynamic TDD terminal 200 of the transmission timing of ACK / NACK associated with the downlink transmission.
- the base station 100 may designate a candidate with a higher downlink ratio among the set of configuration candidates.
- the signaling SIG2 specify a configuration candidate in which all subframes at positions that can be downlink subframes in other configuration candidates are defined as downlink subframes. For example, when the set of configuration candidates includes Configuration 0 to Configuration 6, the signaling SIG2 may specify Configuration 5.
- FIG. 10A is an explanatory diagram for describing a first example of new transmission timings of ACK / NACK based on the signaling SIG2.
- Configuration 5 is designated in the signaling SIG2.
- a wireless frame F51 and a subsequent wireless frame F52 are shown in the lower part of FIG. 10A.
- the configuration for dynamic TDD set in the radio frame F51 is Configuration3.
- the configuration for dynamic TDD set in the radio frame F52 is Configuration2. In this case, a collision in the link direction occurs in the third, fourth and seventh subframes.
- ACKs / NACKs for downlink transmission in any downlink subframe are transmitted in the second subframe.
- the ACK / NACK is transmitted in the second uplink subframe of radio frame F52.
- the ACK / NACK for the downlink transmission in the 9th downlink subframe of radio frame F51 is sent in the 2 nd uplink subframe of the next radio frame of radio frame F52.
- the ACK / NACK for the downlink transmission in the 0th downlink subframe of radio frame F52 is transmitted in the 2 nd uplink subframe of the next radio frame of radio frame F52. And, since no collision in the link direction occurs in the uplink subframe in which these ACK / NACKs are transmitted, loss of ACK / NACK caused by the collision in the link direction is avoided.
- FIG. 10B is an explanatory diagram for describing a second example of new transmission timing of ACK / NACK based on the signaling SIG2.
- Configuration 4 is designated in the signaling SIG2.
- a wireless frame F61 and a subsequent wireless frame F62 are shown in the lower part of FIG. 10B.
- the configuration for dynamic TDD set in the radio frame F61 is Configuration3.
- the configuration for dynamic TDD set in the radio frame F62 is Configuration1. In this case, a collision in the link direction occurs in the fourth, seventh and eighth subframes.
- ACKs / NACKs for downlink transmission in any downlink subframe are transmitted in the second or third subframe.
- ACK / NACK for downlink transmission in the first and fifth downlink subframes of the radio frame F61 is the same as that of the radio frame F62. It is sent in the second uplink subframe.
- the ACKs / NACKs for downlink transmission in the sixth, seventh, eighth and ninth downlink subframes of the radio frame F61 are transmitted in the third uplink subframe of the radio frame F62.
- the ACK / NACK for the downlink transmission in the 0th downlink subframe of radio frame F62 is transmitted in the 2 nd uplink subframe of the next radio frame of radio frame F62. And, since no collision in the link direction occurs in the uplink subframe in which these ACK / NACKs are transmitted, loss of ACK / NACK caused by the collision in the link direction is avoided.
- the example of FIG. 10B is effective when Configuration 5 and the like are excluded from the set of configuration candidates.
- the legacy terminal 104 does not receive the signaling SIG2 and operates according to the legacy configuration (for example, Configuration 0) specified in the signaling SIG0.
- the legacy configuration for example, Configuration 0
- ACKs / NACKs for downlink transmission in the sixth subframe are transmitted in the second subframe, which is the uplink subframe.
- the base station 100 can appropriately receive the ACK / NACK for the downlink transmission by limiting the scheduling to schedule the downlink transmission to the legacy terminal 104 in the sixth subframe.
- the signaling SIG3 notifies the dynamic TDD terminal 200 of the transmission timing of the uplink transmission associated with the UL grant.
- the base station 100 may designate a candidate with a higher uplink ratio among the set of configuration candidates.
- the signaling SIG3 specify a configuration candidate in which all subframes at positions that can be uplink subframes in other configuration candidates are defined as uplink subframes. For example, if the set of configuration candidates includes Configuration 0 to Configuration 6, the signaling SIG3 may specify Configuration 0.
- FIG. 11A is an explanatory diagram for describing a first example of new transmission timings of UL permission based on the signaling SIG3.
- Configuration 0 is designated in the signaling SIG3.
- a wireless frame F71 and a subsequent wireless frame F72 are shown in the lower part of FIG. 11A.
- the configuration for dynamic TDD set in the radio frame F71 is Configuration0.
- the configuration for dynamic TDD set in the radio frame F72 is Configuration 4. In this case, a collision in the link direction occurs in the fourth, seventh, eighth and ninth subframes.
- UL grants for uplink transmission in any uplink subframe are sent in the 0th, 1st, 5th or 6th subframes.
- the link direction of these four subframes is always downlink regardless of the configuration.
- the UL grant for uplink transmission in the second and third uplink subframes of radio frame F72 is the same as that of radio frame F71. It is transmitted in the sixth downlink subframe. There is no link direction collision in the downlink subframes where this UL grant is sent.
- FIG. 11B is an explanatory diagram for describing a second example of a new transmission timing of UL permission based on the signaling SIG3.
- Configuration 6 is specified in the signaling SIG3 as shown in the upper part.
- a wireless frame F81 and a subsequent wireless frame F82 are shown in the lower part of FIG. 11B.
- the configuration for dynamic TDD set in the radio frame F81 is Configuration1.
- the configuration for dynamic TDD set in the radio frame F82 is Configuration3.
- a collision in the link direction occurs in the fourth, seventh and eighth subframes.
- the UL grant for uplink transmission in the second uplink subframe of radio frame F 82 is: It is transmitted in the fifth downlink subframe of the radio frame F81.
- the UL grant for uplink transmission in the third uplink subframe of radio frame F82 is sent in the sixth downlink subframe of radio frame F81.
- the UL grant for uplink transmission in the fourth uplink subframe of radio frame F82 is sent in the ninth downlink subframe of radio frame F81.
- no link direction collisions occur.
- FIG. 11B is effective when Configuration 0 etc. are excluded from the set of configuration candidates.
- the legacy terminal 104 does not receive the signaling SIG3 and operates according to the legacy configuration (for example, Configuration 0) specified in the signaling SIG0.
- the legacy configuration for example, Configuration 0
- UL grants for uplink transmission in any uplink subframe are always transmitted in the 0, 1, 5, or 6 subframes, which are downlink subframes. Ru.
- the base station 100 can properly transmit the UL grant to the legacy terminal 104 without imposing special restrictions on the scheduling of uplink transmissions from the legacy terminal 104.
- the base station 100 has a role as a communication control apparatus that controls wireless communication performed by a terminal apparatus according to a time division duplex (TDD) scheme.
- FIG. 12 is a block diagram showing an example of the configuration of base station 100. Referring to FIG. Referring to FIG. 12, the base station 100 includes a wireless communication unit 110, a signal processing unit 120, an interface unit 130, a setting unit 140, a storage unit 142, and a signaling unit 150.
- the radio communication unit 110 is a communication interface for the base station 100 to transmit and receive radio signals to and from one or more terminal devices.
- the wireless communication unit 110 has one or more antennas (not shown) and an RF circuit.
- the wireless communication unit 110 receives the uplink signal transmitted from the terminal device, and performs amplification, frequency conversion, and AD conversion of the received signal. Also, the wireless communication unit 110 performs DA conversion of the transmission signal, frequency conversion, and amplification, and transmits the downlink signal to the terminal device.
- the uplink signals received by the wireless communication unit 110 include uplink data signals and uplink signaling.
- Uplink signaling includes buffer status reports from each terminal and ACKs / NACKs associated with downlink transmissions.
- downlink signals transmitted by the wireless communication unit 110 include downlink data signals and downlink signaling.
- Downlink signaling may include UL grants associated with uplink transmissions, as well as the signaling SIG0, SIG1, SIG2 and SIG3 described above.
- the signal processing unit 120 performs equalization, demodulation and decoding of a received signal input from the wireless communication unit 110, and encoding and modulation of a transmission signal output to the wireless communication unit 110. It has a signal processing circuit.
- the signal processing unit 120 outputs data included in the demodulated and decoded reception signal to the interface unit 130. Also, the signal processing unit 120 encodes and modulates a transmission signal including data input from the interface unit 130.
- the interface unit 130 is an X2 interface for the base station 100 to communicate with another base station, and S1 for the base station 100 to communicate with a control node in the core network 106. Communication interface group such as interface is included. Each communication interface of the interface unit 130 may be a wired communication interface or a wireless communication interface.
- the interface unit 130 receives buffer signaling from, for example, the P-GW. The buffer signaling indicates the amount of traffic of downlink data signals waiting for buffer per terminal. The interface unit 130 outputs the received buffer signaling to the setting unit 140.
- the setting unit 140 sets, for each frame including a plurality of subframes, a link direction configuration representing a link direction in subframe units for wireless communication in a cell. More specifically, the setting unit 140 sets a legacy configuration for a first terminal group including one or more legacy terminals 104. In addition, configuration section 140 configures a configuration for dynamic TDD for a second terminal group including one or more dynamic TDD terminals 200.
- the wireless communication unit 110 operates in accordance with the configuration for dynamic TDD set by the setting unit 140.
- the configuration unit 140 may semi-permanently set a predefined link direction configuration (for example, Configuration 0) as a configuration for legacy.
- a predefined link direction configuration for example, Configuration 0
- the link direction configuration set as the configuration for legacy may be defined such that successful synchronization tracking with CRS by legacy terminal 104 is ensured.
- configuration section 140 selects, from a plurality of configuration candidates, a configuration for dynamic TDD to be set in each radio frame, based on the latest value of UL-DL traffic ratio or the predicted future value. For example, the configuration unit 140 may select a link direction configuration with a higher uplink rate if more uplink traffic is waiting for buffers. Similarly, configuration section 140 may select a link direction configuration with a high downlink rate if more downlink traffic is waiting for buffers.
- the set of configuration candidates that can be selected in the wireless communication network may be all of the seven link direction configurations defined in Non-Patent Document 1, or may be a network specific subset.
- the setting unit 140 does not depend on the set configuration for dynamic TDD, and in radio communication with the terminal apparatus, the second in the reverse of the first link direction associated with data transmission in the first link direction.
- Set the timing of control signaling in the link direction of The control signaling includes one or both of ACK / NACK transmitted from the terminal device in response to the downlink transmission and / or UL grant transmitted to the terminal device prior to uplink transmission.
- the setting unit 140 sets the timing of control signaling in such a manner as to specify one of selectable configuration candidates.
- configuration section 140 may designate a candidate with a higher downlink ratio out of the set of configuration candidates as the timing of ACK / NACK for downlink transmission.
- a link direction collision may occur in the uplink subframe in which an ACK / NACK is transmitted even when the configuration for dynamic TDD is updated. It can be avoided.
- Both the base station 100 and the dynamic TDD terminal 200 previously store a table (see Table 1) that associates downlink transmission timing with ACK / NACK timing for each configuration candidate. Then, timing at which ACK / NACK is actually transmitted by the dynamic TDD terminal 200 is determined based on an entry in the table corresponding to the configuration set by the setting unit 140.
- configuration section 140 may designate a candidate with a higher uplink ratio in the set of configuration candidates as the timing of UL permission prior to uplink transmission.
- UL permission is permitted while avoiding the occurrence of subframes that can not be used for uplink transmission.
- the timing of the can be determined.
- Both the base station 100 and the dynamic TDD terminal 200 previously store a table (see Table 2) that associates uplink transmission timing with UL grant timing for each configuration candidate. Then, the timing at which the UL permission is actually transmitted by the wireless communication unit 110 is determined based on the entry in the table corresponding to the configuration set by the setting unit 140.
- the storage unit 142 is a storage medium storing various parameters set by the setting unit 140 and various data referred to when setting the parameters.
- the storage unit 142 stores in advance a set of configuration candidates selectable by the base station 100.
- the storage unit 142 stores the legacy configuration and the dynamic TDD configuration set by the setting unit 140.
- the storage unit 142 stores in advance a first table that associates downlink transmission timing with ACK / NACK timing, and a second table that associates uplink transmission timing with UL permission timing.
- the storage unit 142 stores the timing of ACK / NACK and the timing of UL permission set by the setting unit 140 in the form of designating the configuration candidate number.
- the setting unit 140 also has a role as a scheduler. More specifically, configuration section 140 schedules downlink transmission from base station 100 to each terminal apparatus and uplink transmission from each terminal apparatus to base station 100. Then, configuration section 140 generates downlink assignment (UL) and UL grant (Uplink Grant) indicating the result of scheduling. The scheduling information is transmitted by the signaling unit 150 to each terminal device.
- the transmission timing of the UL grant is the timing of the scheduled uplink transmission by referring to the entry of the configuration number designated for the timing of UL grant in the second table stored by the storage unit 142. It is determined from
- the signaling unit 150 uses the wireless communication unit 110 to set the link direction configuration set by the setting unit 140 and the timing of the above-mentioned control signaling (one or both of ACK / NACK and UL permission). Signal to the terminal device.
- the signaling unit 150 signals the legacy configuration to the legacy terminal 104 by broadcasting an SI message at a signaling cycle C1 (SIG0). Also, the signaling unit 150 signals the configuration for dynamic TDD to the dynamic TDD terminal 200 by transmitting a DC message at a signaling cycle C2 shorter than the signaling cycle C1 (SIG1). At the timing when the link direction configuration is not updated, transmission of the SI message or DC message may be skipped.
- the signaling unit 150 signals the timing of ACK / NACK for downlink transmission to the dynamic TDD terminal 200 by specifying the configuration number set by the setting unit 140 (SIG2). Also, the signaling unit 150 signals the timing of UL permission to the dynamic TDD terminal 200 by specifying the configuration number set by the setting unit 140 (SIG3).
- the signaling unit 150 may perform these signaling when connecting the dynamic TDD terminal 200 to the base station 100 (which may include both a new connection and return to the active mode). Also, the signaling unit 150 may periodically execute these signalings.
- FIG. 13 is a block diagram showing an example of the configuration of the dynamic TDD terminal 200.
- the dynamic TDD terminal 200 includes a wireless communication unit 210, a signal processing unit 220, a control unit 230, and a storage unit 240.
- the wireless communication unit 210 is a communication interface for the dynamic TDD terminal 200 to transmit and receive a wireless signal to and from the base station 100.
- the wireless communication unit 210 has one or more antennas (not shown) and an RF circuit.
- the wireless communication unit 210 receives the downlink signal transmitted from the base station 100, and performs amplification, frequency conversion, and AD conversion of the received signal. Also, the wireless communication unit 210 performs DA conversion, frequency conversion, and amplification of the transmission signal, and transmits the uplink signal to the base station 100.
- the downlink signal received by the wireless communication unit 210 includes downlink data signal and downlink signaling.
- Downlink signaling may include UL grants associated with uplink transmissions, as well as the signaling SIG1, SIG2 and SIG3 described above.
- uplink signals transmitted by the wireless communication unit 210 include uplink data signals and uplink signaling.
- Uplink signaling includes buffer status reports and ACKs / NACKs associated with downlink transmissions.
- the signal processing unit 220 performs equalization, demodulation and decoding of a received signal input from the wireless communication unit 210, and encoding and modulation of a transmission signal output to the wireless communication unit 210. It has a signal processing circuit.
- the signal processing unit 220 is connected to, for example, a processor (not shown) that implements processing of the upper layer. Then, the signal processing unit 220 outputs data included in the demodulated and decoded reception signal to the upper layer. Also, the signal processing unit 220 encodes and modulates a transmission signal including data input from the upper layer.
- Control Unit 230 controls wireless communication by the dynamic TDD terminal 200 according to the TD-LTE method. For example, in accordance with the configuration for dynamic TDD specified in the DC message received from base station 100, control unit 230 sets the link direction in units of subframes in radio communication unit 210 and signal processing unit 220. In addition, in the downlink subframe, the control unit 230 causes the wireless communication unit 210 to receive CRS, and performs synchronization tracking. In addition, the control unit 230 periodically generates a buffer status report indicating the amount of traffic of the uplink data signal in the buffer standby, and transmits the generated buffer status report from the wireless communication unit 210 to the base station 100.
- control unit 230 sets the offset between the timing of data transmission in the first link direction and the timing of control signaling in the second link direction associated with the data transmission based on the signaling from the base station 100. Set.
- control section 230 sets an offset of timing between the downlink transmission and an ACK / NACK associated with the downlink transmission based on signaling SIG2 received from base station 100.
- the offset set here is indicated by the entry specified by the signaling SIG2 in the first table that associates downlink transmission timing and ACK / NACK timing.
- the control unit 230 causes the wireless communication unit 210 to receive the downlink signal according to the downlink assignment received by the wireless communication unit 210.
- the control unit 230 determines the timing of each ACK / NACK based on the set offset and the timing of downlink transmission. All subframes corresponding to the timing of ACK / NACK determined in this way become uplink subframes regardless of the configuration for dynamic TDD. Therefore, the control unit 230 does not have to determine a link direction collision each time downlink transmission is performed, and also does not need to perform an operation of deferring ACK / NACK.
- control unit 230 sets an offset of timing between the uplink transmission and the UL permission associated with the uplink transmission based on the signaling SIG3 received from the base station 100.
- the offset set here is indicated by the entry designated by the signaling SIG3 in the second table that associates the timing of uplink transmission with the timing of UL grant.
- the control unit 230 causes the wireless communication unit 210 to transmit the uplink signal in accordance with the UL permission received by the wireless communication unit 210.
- the timing of uplink transmission may apply to any uplink subframe of the configured dynamic TDD configuration. That is, since there is no uplink subframe that can not be used, a reduction in the utilization efficiency of radio resources is avoided.
- the storage unit 240 is a storage medium storing data and a program used by the control unit 230 to control wireless communication by the dynamic TDD terminal 200.
- the storage unit 240 stores the configuration for dynamic TDD set by the control unit 230.
- the storage unit 240 stores in advance a first table that associates downlink transmission timing with ACK / NACK timing, and a second table that associates uplink transmission timing with UL permission timing.
- the storage unit 240 stores the timing of ACK / NACK and the timing of UL permission, which are set by the control unit 230, in the form of designating the configuration candidate number.
- the dynamic TDD terminal 200 performs the link direction according to the dynamic TDD configuration in a first operation mode in which the link direction is set according to the legacy configuration in the same manner as the legacy terminal 104, and in a shorter cycle. It may be operable in both of the set second operation modes. For example, the dynamic TDD terminal 200 may operate in the first mode of operation at the stage of initial synchronization to the wireless communication network, and then transition to the second mode of operation upon receipt of the DC message. According to this configuration, the dynamic TDD terminal 200 flexibly exchanges signaling with the base station 100 on various channels after establishing synchronization with the base station 100 according to the existing procedure. , Setting for the second operation mode can be obtained.
- the dynamic TDD terminal 200 receives the SI message at low frequency in the idle mode (RRC_Idle) (ie, the first operation mode), and receives the DC message at high frequency in the active mode (RRC_Connected) (ie, the second Mode of operation). Thereby, it is possible to avoid the increase in power consumption in the idle mode.
- RRC_Idle ie, the first operation mode
- RRC_Connected the DC message at high frequency in the active mode
- FIGS. 14A and 14B are sequence diagrams showing an example of the flow of processing that can be executed in the communication control system 1 according to the present embodiment.
- the base station 100, the legacy terminal 104, and the dynamic TDD terminal 200 are involved in the processing described here.
- the dynamic TDD terminal 200 is, as an example, a terminal that supports the dual mode described above.
- the base station 100 broadcasts an SI message periodically at a signaling cycle C1 (step S100).
- the SI message is a message for signaling the configuration for legacy, and for example, specifies Configuration 0.
- the legacy terminal 104 receives the SI message and sets Configuration 0 as a legacy configuration.
- the dynamic TDD terminal 200 also receives the SI message, and establishes initial synchronization with the base station 100 according to the legacy configuration (step S104).
- the base station 100 collects data on the amount of uplink traffic waiting for buffer at the terminal and the amount of downlink traffic waiting for buffer in the core network, and monitors the UL-DL traffic ratio (step S108). Then, the base station 100 sets the configuration for dynamic TDD according to (the latest value or the predicted future value) of the UL-DL traffic ratio (step S112).
- the dynamic TDD terminal 200 that has established initial synchronization with the base station 100 transmits a connection request to the base station 100 in the uplink subframe (step S116).
- the base station 100 approves the connection from the dynamic TDD terminal 200 (step S120).
- the base station 100 transmits a capability inquiry to the dynamic TDD terminal 200 (step S124).
- the dynamic TDD terminal 200 responds to the base station 100 that it supports dynamic TDD (reception of the signaling SIG1, SIG2 and SIG3) (step S128).
- base station 100 transmits a DC message to dynamic TDD terminal 200 (step S132).
- the DC message is a message for signaling a configuration for dynamic TDD, and indicates the configuration number set by the base station 100 in step S112.
- the DC message doubles as signaling SIG2 and SIG3 in addition to signaling SIG1. That is, the DC message also specifies a configuration number for ACK / NACK timing for downlink transmission and a configuration number for UL grant timing.
- the configuration for dynamic TDD is Configuration 2
- the timing of ACK / NACK is Configuration 5
- the timing of UL grant is Configuration 0.
- the dynamic TDD terminal 200 When receiving the DC message from the base station 100 in step S132, the dynamic TDD terminal 200 returns a response (step S136), and changes the setting of the link direction to Configuration 2 that is a configuration for dynamic TDD (step S140). Also, the dynamic TDD terminal 200 stores Configuration 5 as the ACK / NACK timing and Configuration 0 as the UL permission timing.
- the base station 100 schedules the traffic (step S144). If the generated traffic is downlink traffic, the base station 100 transmits the downlink traffic to the dynamic TDD terminal 200 according to the downlink assignment (step S148).
- the dynamic TDD terminal 200 determines an ACK / NACK transmission timing for downlink traffic based on the configuration number (Configuration 5) signaled from the base station 100 in step S140, and determines the ACK / NACK as a base station at the determined timing. It transmits to 100 (step S152).
- the base station 100 starts UL grant transmission timing from uplink transmission timing based on the configuration number (Configuration 0) signaled to the dynamic TDD terminal 200 in step S140.
- the UL grant is transmitted to the dynamic TDD terminal 200 at the determined and determined timing (step S148).
- the dynamic TDD terminal 200 determines uplink transmission timing for UL grant based on the configuration number signaled from the base station 100, and transmits uplink traffic to the base station 100 at the determined timing (step S152). .
- the sequence moves to FIG. 14B, and then it is assumed that the base station 100 detects a change in the UL-DL traffic ratio (step S160). Then, the base station 100 determines to update the configuration for dynamic TDD according to the UL-DL traffic ratio. Then, the base station 100 transmits a DC message to the dynamic TDD terminal 200 (step S164). The dynamic TDD terminal 200 returns a response (step S168).
- the DC message transmitted here is a message for signaling a configuration for dynamic TDD after the future update (Configuration 3 in the example of FIG. 14B).
- the base station 100 updates the configuration for dynamic TDD configuration to the configuration signaled in step S164 (step S180).
- the dynamic TDD terminal 200 also changes the configuration settings for dynamic TDD to the configuration signaled from the base station 100 (step S184).
- the timing of ACK / NACK or uplink transmission associated with the downlink traffic or UL grant received in step S176 is not affected by the dynamic TDD configuration update.
- the dynamic TDD terminal 200 determines transmission timing of ACK / NACK or uplink traffic based on the configuration number signaled from the base station 100 in step S140, and bases ACK / NACK or uplink traffic at the determined timing. It transmits to the station 100 (step S188).
- the second associated with data transmission in the first link direction is not dependent on the link direction configuration configured for wireless communication in a time division duplex (TDD) mode.
- TDD time division duplex
- the timing of control signaling in the link direction is set. Therefore, it is possible to prevent a decrease in throughput due to a link direction collision while eliminating the need for a highly loaded process of determining a link direction collision whenever the link direction configuration is updated.
- the timing of the control signaling is signaled to the terminal apparatus separately from the link direction configuration set according to the UL-DL traffic ratio.
- the terminal can properly grasp and anticipate the timing of data transmission and control signaling associated with each other regardless of the link direction configuration update.
- the timing of the control signaling is signaled in a form of designating one of a plurality of configuration candidates for link direction configuration.
- the number of bits signaled may be only a few bits for the configuration number. Therefore, even if the new signaling described above is adopted, the increase in signaling overhead is small.
- data defining a set of configuration candidates is data that is also held by legacy terminals. Therefore, the above-described mechanism can be easily realized by reusing existing data without introducing additional data definitions.
- the timing of the control signaling may be signaled to the terminal device when the terminal device is connected to the wireless communication network. Therefore, even when a set of configuration candidates specific to the wireless communication network is used, it is possible to appropriately notify the terminal device of the timing of control signaling that is optimal to avoid the decrease in throughput.
- each device described in the present specification may be realized using any of software, hardware, and a combination of software and hardware.
- the programs that configure the software are stored in advance in, for example, storage media (non-transitory media) provided inside or outside each device. Then, each program is read into, for example, a random access memory (RAM) at the time of execution, and is executed by a processor such as a central processing unit (CPU).
- RAM random access memory
- CPU central processing unit
- a communication control apparatus for controlling wireless communication performed by a terminal apparatus in accordance with a time division duplex (TDD) scheme in a wireless communication network, comprising: A setting unit configured to set a link direction configuration representing a link direction in units of subframes for the wireless communication, for each of the frames including a plurality of subframes; Equipped with The setting unit is associated with data transmission in a first link direction in the wireless communication without depending on the set link direction configuration, and a second link direction opposite to the first link direction. Set the timing of control signaling of Communication control unit.
- TDD time division duplex
- the communication control device A signaling unit for signaling the link direction configuration set by the setting unit and the timing to the terminal device;
- the communication control device according to (1) further comprising: (3)
- the setting unit sets the link direction configuration selected from a plurality of configuration candidates for the wireless communication,
- the signaling unit signals the timing by specifying one of the plurality of configuration candidates.
- the first link direction is a downlink
- the second link direction is an uplink
- the control signaling is an ACK / NACK transmitted from the terminal device as a response to downlink transmission.
- the communication control device according to (3) is
- the first link direction is an uplink and the second link direction is a downlink
- the control signaling is an uplink grant sent to the terminal prior to uplink transmission,
- the communication control device according to (3).
- the communication control apparatus designates a candidate with a higher downlink ratio among the plurality of configuration candidates.
- the communication control apparatus designates a candidate with a higher uplink ratio among the plurality of configuration candidates.
- the communication control apparatus further includes a storage unit that stores a table that associates the timing of the data transmission and the timing of the control signaling for each configuration candidate.
- One of the timing of the data transmission and the timing of the control signaling is determined based on the other timing by referring to the entry for the designated configuration candidate in the table.
- the communication control device according to (6) or (7).
- the setting unit selects, from the plurality of configuration candidates, the link direction configuration to be set according to a ratio between uplink traffic and downlink traffic in the wireless communication network.
- the communication control device according to any one of (8) to (8).
- the plurality of configuration candidates are specific to the wireless communication network
- the signaling unit signals the timing to the terminal device when the terminal device is connected to the wireless communication network.
- the communication control device according to any one of (3) to (9).
- the setting unit sets the link direction configuration for a first terminal group, and sets another link direction configuration for a second terminal group.
- the signaling unit signals the link direction configuration to terminals belonging to the first terminal group in a cycle shorter than a signaling cycle to terminals belonging to the second terminal group.
- the communication control device according to any one of (2) to (10).
- (12) The communication control apparatus according to any one of (1) to (11), wherein the communication control apparatus is a base station.
- the communication control apparatus is a control node that communicates with the terminal apparatus via a base station.
- a communication control method for controlling wireless communication performed by a terminal device in accordance with a time division duplex (TDD) scheme in a wireless communication network comprising: Setting a link direction configuration representing a link direction in units of subframes for the wireless communication for each of the frames including a plurality of subframes; Timing of control signaling in a second link direction opposite to the first link direction, associated with data transmission in the first link direction in the wireless communication, without depending on the set link direction configuration
- Setting and Communication control method including: (15) A computer of a communication control apparatus for controlling wireless communication performed by a terminal according to a time division duplex (TDD) scheme in a wireless communication network, A program that functions as a setting unit configured to set a link direction configuration representing a link direction in units of subframes for the wireless communication, for each frame including a plurality of subframes, The setting unit is associated with data transmission in a first link direction in the wireless communication without depending on the set link direction configuration, and a second link direction opposite to the first link direction.
- TDD time
- a wireless communication unit that communicates with a base station in a time division duplex (TDD) mode;
- a control unit configured to set a link direction in units of subframes for each frame including a plurality of subframes according to a link direction configuration indicated by first signaling from the base station; Equipped with The control unit is configured to offset the offset between the timing of data transmission in a first link direction and the timing of control signaling in a second link direction opposite to the first link direction associated with the data transmission, Setting based on second signaling from the base station, Terminal equipment.
- a wireless communication method performed by a terminal apparatus comprising a wireless communication unit that communicates with a base station in a time division duplex (TDD) mode, comprising: Setting a link direction in units of subframes for each of the frames including a plurality of subframes according to the link direction configuration indicated by the first signaling from the base station; An offset between the timing of data transmission in a first link direction and the timing of control signaling in a second link direction opposite to the first link direction associated with the data transmission is taken from the base station Configuring based on the second signaling, Wireless communication method including: (18) A terminal device computer comprising a wireless communication unit for communicating with a base station in a time division duplex (TDD) mode, A control unit configured to set a link direction in units of subframes for each frame including a plurality of subframes according to a link direction configuration indicated by first signaling from the base station; A program to function as The control unit is configured to offset the offset between the timing of data transmission in a first link direction and the timing of control signaling
- a communication control system including a terminal device that communicates with a base station in a time division duplex (TDD) mode, and a communication control device that controls wireless communication performed by the terminal device,
- the communication control device A setting unit configured to set a link direction configuration representing a link direction in units of subframes for the wireless communication, for each of the frames including a plurality of subframes; Equipped with The setting unit is associated with data transmission in a first link direction in the wireless communication without depending on the set link direction configuration, and a second link direction opposite to the first link direction. Set the timing of control signaling of Communication control system.
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Abstract
Description
1.概要
1-1.リンク方向コンフィギュレーションの設定
1-2.リンク方向コンフィギュレーションのシグナリング
1-3.リンク方向の衝突
1-4.追加的な課題
2.通信制御システムの構成
2-1.システムの概要
2-2.基本的な原理
2-3.通信制御装置の構成例
2-4.ダイナミックTDD端末の構成例
3.処理の流れの例
4.まとめ
[1-1.リンク方向コンフィギュレーションの設定]
図1は、TD-LTEにおけるリンク方向コンフィギュレーションの一例について説明するための説明図である。図1を参照すると、LTE方式において採用される無線フレームのフレームフォーマットが示されている。1つの無線フレーム(radio frame)は、10個のサブフレーム(#0~#9)を含む。各サブフレームの時間長は1msecであり、1つの無線フレームの時間長は10msecである。リンク方向は、サブフレーム単位で設定される。図1の例において、「D」とラベリングされたサブフレームのリンク方向はダウンリンクであり、当該サブフレームをダウンリンクサブフレームという。「U」とラベリングされたサブフレームのリンク方向はアップリンクであり、当該サブフレームをアップリンクサブフレームという。「S」とラベリングされたサブフレームは、TD-LTEに特有のスペシャルサブフレームである。図1に例示したように、基地局(eNB)から送信されるダウンリンク信号は、遅延dTと共に端末装置(UE)へ到達する。端末装置は、基地局へ到達するアップリンク信号の遅延dTを考慮に入れて、基地局のアップリンクサブフレームのタイミングよりも先行してアップリンク信号を送信する。スペシャルサブフレームは、ダウンリンクサブフレームからアップリンクサブフレームへの切替えのタイミングで挿入され、端末装置でのダウンリンク信号の受信及びアップリンク信号の送信のタイミングが重ならないようにする緩衝期間としての役割を有する。スペシャルサブフレームは、UEによりダウンリンク信号が受信されるダウンリンクパイロットタイムスロットと、ガード期間(Guard Period)と、UEによりアップリンク信号が送信されるアップリンクパイロットタイムスロットとを含む。なお、スペシャルサブフレームにおいても基地局から端末装置へダウンリンクデータは送信され得る。その意味において、スペシャルサブフレームはダウンリンクサブフレームの一種であると見なすこともできる。
基地局又はその他の制御ノードにより設定されたリンク方向コンフィギュレーションは、基地局から端末装置へのSIB1を用いたブロードキャストによってシグナリングされる。現在の標準仕様におけるSIB1の更新の周期は、640msecである。上記非特許文献2によれば、SIB1を用いたリンク方向コンフィギュレーションの更新の周期は、320msecに短縮され得る。SIB1は、DL-SCH(Downlink Shared Channel)にマッピングされる様々なタイプのSIB(System Information Block)のうちの1つである。SIBを搬送するメッセージを、SI(System Information)メッセージという。SIメッセージの最短の送信周期は、80msecである。従って、SIメッセージでリンク方向コンフィギュレーションがシグナリングされる限り、リンク方向コンフィギュレーションの更新周期は最短で80msecである。
短い周期でダイナミックTDD用コンフィギュレーションを更新する場合、更新前及び更新後の2つのコンフィギュレーションの間で、リンク方向の衝突が頻繁に発生し得る。ここでは、リンク方向の衝突とは、更新前の無線フレームのi番目(i=0,…,9)のサブフレームのリンク方向と、更新後の無線フレームのi番目のサブフレームのリンク方向とが互いに異なることをいう。リンク方向の衝突は、衝突の発生するタイミングでのデータ送信又は制御シグナリングのロスをもたらし、通信のスループットを低下させる。以下、非特許文献3において説明されている2つのケースについて説明する。
確認応答(ACK)及び否定応答(NACK)は、データ送信の信頼性を確保するための仕組みであるHARQ(ハイブリッド自動再送要求:Hybrid Automatic Repeat Request)のベースとなる基本的な制御シグナリングである。ダウンリンク送信のタイミングとACK/NACKのタイミングとのオフセットが、3GPP TS36.213のテーブル10.1.3.1-1において、リンク方向コンフィギュレーションごとに定義されている(表1参照)。
UL許可(Uplink Grant)は、アップリンク送信がスケジューリングされたことを端末装置へ通知するための制御シグナリングである。アップリンク送信とUL許可との間のタイミングのオフセットは、3GPP TS36.213のテーブル8-2において、リンク方向コンフィギュレーションごとに定義されている(表2参照)。
非特許文献3は、リンク方向コンフィギュレーションが短い周期で更新される状況での上述した課題に対するいくつかの解決策を提案している。それら解決策は、制御シグナリング(ACK/NACK又はUL許可)のタイミングの延期又は前倒しなどであり、いずれも、リンク方向の衝突の判定と制御シグナリングのタイミングの個別の変更とを要する。リンク方向コンフィギュレーションが短い周期で更新されることを前提とすれば、そうした解決策は、処理の負荷を著しく増大させ、電力消費を悪化させることに加えて、複雑な実装に起因するコストの増加も招くというデメリットを有する。本開示に係る技術は、これらデメリットを回避しつつ、リンク方向コンフィギュレーションが短い周期で更新される状況において、リンク方向の衝突に起因するスループットの低下を防ぐことのできる、改善された仕組みを提供する。
なお、ダイナミックTDD用コンフィギュレーションがレガシー用コンフィギュレーションよりも短い周期で更新される結果として、これら2つのコンフィギュレーションの間でもリンク方向の衝突が生じ得る。2つのコンフィギュレーションの間のリンク方向の衝突は、レガシー端末の同期動作に影響を与える可能性がある。
[2-1.システムの概要]
図8は、本開示に係る技術の一実施形態に係る通信制御システム1の構成の一例を示す説明図である。図8を参照すると、通信制御システム1は、基地局100を含む。基地局(eNB)100は、セル102の内部に位置するレガシー端末104及びダイナミックTDD端末200へ、TD-LTE方式に従って無線通信サービスを提供する。基地局100は、典型的にはEPC(Evolved Packet Core)として実現されるコアネットワーク106と接続される。コアネットワーク106は、例えば、MME(Mobility Management Entity)、S-GW(Serving Gateway)及びP-GWなどの様々な制御ノードを含む。
本節では、通信制御システム1において、ダイナミックTDD用コンフィギュレーションを短い周期で更新することを可能としつつも、リンク方向の衝突に起因するスループットの低下を防ぐための、基本的な原理について説明する。
本実施形態において、基地局100は、レガシー端末104のためにレガシー用コンフィギュレーションを設定する。また、基地局100は、ダイナミックTDD端末200のためにダイナミックTDD用コンフィギュレーションを設定する。ダイナミックTDD用コンフィギュレーションは、レガシー用コンフィギュレーションのシグナリング周期よりも短い時間間隔で更新可能である。さらに、基地局100は、ダイナミックTDD用コンフィギュレーションに依存することなく、第1のリンク方向(DL又はUL)のデータ送信に関連付けられる第2のリンク方向(UL又はDL)の制御シグナリングのタイミングを設定する。ここでの制御シグナリングは、ダウンリンク送信に関連付けられるACK/NACK及びアップリンク送信に関連付けられるUL許可のうちの一方又は双方を含み得る。そして、基地局100は、これら設定に基づいて、いくつかの種類のシグナリングを実行する。
本実施形態において、基地局100は、シグナリングSIG0~SIG3の各々において、コンフィギュレーション候補のセットのうちの1つをそれぞれ指定する。コンフィギュレーション候補のセットとは、典型的には、図2に例示したConfiguration0~Configuration6を含み得る。コンフィギュレーション候補のセットは無線通信ネットワークに固有であってもよく、その場合、いくつかのリンク方向コンフィギュレーションがコンフィギュレーション候補のセットから除外され得る。
シグナリングSIG1では、ネットワーク内のアップリンクトラフィックとダウンリンクトラフィックとの間の比率(UL-DLトラフィック比)に応じて選択されるコンフィギュレーション候補が、ダイナミックTDD用コンフィギュレーションとして指定される。例えば、コンフィギュレーション候補のセットがConfiguration0~Configuration2のみを含む場合において、アップリンクトラフィックの比率がより高いときは、Configuration0が指定され得る。同じ場合において、ダウンリンクトラフィックの比率がより高いときは、Configuration2が指定され得る。同じ場合において、アップリンクトラフィックの比率とダウンリンクトラフィックの比率との間の差が小さいときは、Configuration1が指定され得る。UL-DLトラフィック比のモニタリングは、例えば、1~数無線フレーム分の(即ち、10~数十msecの)時間間隔で行われてよい。将来のUL-DLトラフィック比の予測に基づいて、ダイナミックTDD用コンフィギュレーションが選択されてもよい。
上述したように、シグナリングSIG2は、ダウンリンク送信に関連付けられるACK/NACKの送信タイミングをダイナミックTDD端末200へ通知する。シグナリングSIG2では、基地局100は、コンフィギュレーション候補のセットのうちダウンリンク比率のより高い候補を指定し得る。特に、シグナリングSIG2は、他のコンフィギュレーション候補においてダウンリンクサブフレームになり得る位置の全てのサブフレームがダウンリンクサブフレームとして定義されているコンフィギュレーション候補を指定することが好適である。例えば、コンフィギュレーション候補のセットがConfiguration0~Configuration6を含む場合には、シグナリングSIG2は、Configuration5を指定し得る。
上述したように、シグナリングSIG3は、UL許可に関連付けられるアップリンク送信の送信タイミングをダイナミックTDD端末200へ通知する。シグナリングSIG3では、基地局100は、コンフィギュレーション候補のセットのうちアップリンク比率のより高い候補を指定し得る。特に、シグナリングSIG3は、他のコンフィギュレーション候補においてアップリンクサブフレームになり得る位置の全てのサブフレームがアップリンクサブフレームとして定義されているコンフィギュレーション候補を指定することが好適である。例えば、コンフィギュレーション候補のセットがConfiguration0~Configuration6を含む場合には、シグナリングSIG3は、Configuration0を指定し得る。
本実施形態において、基地局100は、時分割複信(TDD)方式に従って端末装置により行われる無線通信を制御する通信制御装置としての役割を有する。図12は、基地局100の構成の一例を示すブロック図である。図12を参照すると、基地局100は、無線通信部110、信号処理部120、インタフェース部130、設定部140、記憶部142及びシグナリング部150を備える。
無線通信部110は、基地局100が1つ以上の端末装置との間で無線信号を送受信するための通信インタフェースである。無線通信部110は、1つ以上のアンテナ(図示せず)及びRF回路を有する。無線通信部110は、端末装置から送信されるアップリンク信号を受信し、受信信号の増幅、周波数変換及びAD変換を行う。また、無線通信部110は、送信信号のDA変換、周波数変換及び増幅を行い、ダウンリンク信号を端末装置へ送信する。
信号処理部120は、無線通信部110から入力される受信信号の等化、復調及び復号、並びに無線通信部110へ出力される送信信号の符号化及び変調を行うための信号処理回路を有する。信号処理部120は、復調し及び復号した受信信号に含まれるデータを、インタフェース部130へ出力する。また、信号処理部120は、インタフェース部130から入力されるデータを含む送信信号を符号化し及び変調する。
インタフェース部130は、基地局100が他の基地局との間で通信するためのX2インタフェース、及び基地局100がコアネットワーク106内の制御ノードとの間で通信するためのS1インタフェースなどの通信インタフェース群を含む。インタフェース部130の各通信インタフェースは、有線通信インタフェースであってもよく、又は無線通信インタフェースであってもよい。インタフェース部130は、例えば、P-GWからバッファシグナリングを受信する。当該バッファシグナリングは、端末装置ごとのバッファ待機中のダウンリンクデータ信号のトラフィック量を示す。インタフェース部130は、受信したバッファシグナリングを設定部140へ出力する。
設定部140は、複数のサブフレームを含むフレームの各々について、セル内の無線通信のために、サブフレーム単位のリンク方向を表すリンク方向コンフィギュレーションを設定する。より具体的には、設定部140は、1つ以上のレガシー端末104を含む第1の端末グループのために、レガシー用コンフィギュレーションを設定する。また、設定部140は、1つ以上のダイナミックTDD端末200を含む第2の端末グループのために、ダイナミックTDD用コンフィギュレーションを設定する。無線通信部110は、設定部140により設定されるダイナミックTDD用コンフィギュレーションに従って動作する。
シグナリング部150は、設定部140により設定されるリンク方向コンフィギュレーションと、上述した制御シグナリング(ACK/NACK及びUL許可の一方又は双方)のタイミングとを、無線通信部110を介して端末装置へシグナリングする。
図13は、ダイナミックTDD端末200の構成の一例を示すブロック図である。図13を参照すると、ダイナミックTDD端末200は、無線通信部210、信号処理部220、制御部230及び記憶部240を備える。
無線通信部210は、ダイナミックTDD端末200が基地局100との間で無線信号を送受信するための通信インタフェースである。無線通信部210は、1つ以上のアンテナ(図示せず)及びRF回路を有する。無線通信部210は、基地局100から送信されるダウンリンク信号を受信し、受信信号の増幅、周波数変換及びAD変換を行う。また、無線通信部210は、送信信号のDA変換、周波数変換及び増幅を行い、アップリンク信号を基地局100へ送信する。
信号処理部220は、無線通信部210から入力される受信信号の等化、復調及び復号、並びに無線通信部210へ出力される送信信号の符号化及び変調を行うための信号処理回路を有する。信号処理部220は、例えば、上位レイヤの処理を実現するプロセッサ(図示せず)と接続される。そして、信号処理部220は、復調し及び復号した受信信号に含まれるデータを上位レイヤへ出力する。また、信号処理部220は、上位レイヤから入力されるデータを含む送信信号を符号化し及び変調する。
制御部230は、ダイナミックTDD端末200による無線通信をTD-LTE方式に従って制御する。例えば、制御部230は、基地局100から受信されるDCメッセージにおいて指定されるダイナミックTDD用コンフィギュレーションに従って、サブフレーム単位のリンク方向を無線通信部210及び信号処理部220に設定する。また、制御部230は、ダウンリンクサブフレームにおいて、無線通信部210にCRSを受信させ、同期トラッキングを実行させる。また、制御部230は、バッファ待機中のアップリンクデータ信号のトラフィック量を示すバッファステータスレポートを周期的に生成し、生成したバッファステータスレポートを無線通信部210から基地局100へ送信する。
記憶部240は、制御部230がダイナミックTDD端末200による無線通信を制御するために使用するデータ及びプログラムを記憶する記憶媒体である。例えば、記憶部240は、制御部230により設定されたダイナミックTDD用コンフィギュレーションを記憶する。また、記憶部240は、ダウンリンク送信のタイミングとACK/NACKのタイミングとを関連付ける第1のテーブル、及びアップリンク送信のタイミングとUL許可のタイミングとを関連付ける第2のテーブルを予め記憶する。また、記憶部240は、制御部230により設定されるACK/NACKのタイミング及びUL許可のタイミングを、コンフィギュレーション候補の番号を指定する形で記憶する。
なお、ダイナミックTDD端末200は、レガシー端末104と同様にレガシー用コンフィギュレーションに従ってリンク方向を設定する第1の動作モード、及びより短い周期でダイナミックTDDコンフィギュレーションに従ってリンク方向を設定する第2の動作モードの双方で動作可能であってもよい。例えば、ダイナミックTDD端末200は、無線通信ネットワークへの初期同期の段階において第1の動作モードで動作し、その後、DCメッセージの受信に応じて第2の動作モードへ遷移してもよい。かかる構成によれば、ダイナミックTDD端末200は、既存の手続に従ってが基地局100との間で確実に同期を確立した後、基地局100との間で様々なチャネル上で柔軟にシグナリングを交換し、第2の動作モードのための設定を取得することができる。また、ダイナミックTDD端末200は、アイドルモード(RRC_Idle)において低い頻度でSIメッセージを受信(即ち、第1の動作モード)し、アクティブモード(RRC_Connected)において高い頻度でDCメッセージを受信(即ち、第2の動作モード)してもよい。それにより、アイドルモードでの消費電力が上昇することを回避することができる。
図14A及び図14Bは、本実施形態に係る通信制御システム1において実行され得る処理の流れの一例を示すシーケンス図である。なお、ここで説明する処理には、基地局100、レガシー端末104及びダイナミックTDD端末200が関与する。ダイナミックTDD端末200は、一例として、上述したデュアルモードをサポートする端末であるものとする。
ここまで、図1~図14Bを用いて、本開示に係る技術の実施形態について詳細に説明した。上述した実施形態によれば、時分割複信(TDD)方式での無線通信のために設定されるリンク方向コンフィギュレーションに依存することなく、第1のリンク方向のデータ送信に関連付けられる第2のリンク方向の制御シグナリングのタイミングが設定される。従って、リンク方向コンフィギュレーションが更新される度にリンク方向の衝突を判定するという負荷の高い処理の必要性を排除しつつ、リンク方向の衝突に起因するスループットの低下を防ぐことができる。
(1)
無線通信ネットワーク内で時分割複信(TDD)方式に従って端末装置により行われる無線通信を制御する通信制御装置であって、
複数のサブフレームを含むフレームの各々について、前記無線通信のためにサブフレーム単位のリンク方向を表すリンク方向コンフィギュレーションを設定する設定部、
を備え、
前記設定部は、設定された前記リンク方向コンフィギュレーションに依存することなく、前記無線通信において第1のリンク方向のデータ送信に関連付けられる、前記第1のリンク方向とは逆の第2のリンク方向の制御シグナリングのタイミングを設定する、
通信制御装置。
(2)
前記通信制御装置は、
前記設定部により設定される前記リンク方向コンフィギュレーションと前記タイミングとを前記端末装置へシグナリングするシグナリング部、
をさらに備える、前記(1)に記載の通信制御装置。
(3)
前記設定部は、複数のコンフィギュレーション候補から選択される前記リンク方向コンフィギュレーションを前記無線通信のために設定し、
前記シグナリング部は、前記複数のコンフィギュレーション候補のうちの1つを指定することにより、前記タイミングをシグナリングする、
前記(2)に記載の通信制御装置。
(4)
前記第1のリンク方向はダウンリンクであり、前記第2のリンク方向はアップリンクであり、
前記制御シグナリングは、ダウンリンク送信への応答として前記端末装置から送信されるACK/NACKである、
前記(3)に記載の通信制御装置。
(5)
前記第1のリンク方向はアップリンクであり、前記第2のリンク方向はダウンリンクであり、
前記制御シグナリングは、アップリンク送信に先立って前記端末装置へ送信されるアップリンク許可である、
前記(3)に記載の通信制御装置。
(6)
前記シグナリング部は、前記複数のコンフィギュレーション候補のうちダウンリンク比率のより高い候補を指定する、前記(4)に記載の通信制御装置。
(7)
前記シグナリング部は、前記複数のコンフィギュレーション候補のうちアップリンク比率のより高い候補を指定する、前記(5)に記載の通信制御装置。
(8)
前記通信制御装置は、コンフィギュレーション候補ごとに前記データ送信のタイミングと前記制御シグナリングのタイミングとを関連付けるテーブルを記憶する記憶部、をさらに備え、
前記データ送信のタイミング及び前記制御シグナリングのタイミングの一方は、前記テーブル内の指定されたコンフィギュレーション候補についてのエントリを参照することにより、他方のタイミングに基づいて決定される、
前記(6)又は前記(7)に記載の通信制御装置。
(9)
前記設定部は、前記無線通信ネットワーク内のアップリンクトラフィックとダウンリンクトラフィックとの間の比率に応じて、設定すべき前記リンク方向コンフィギュレーションを前記複数のコンフィギュレーション候補から選択する、前記(3)~(8)のいずれか1項に記載の通信制御装置。
(10)
前記複数のコンフィギュレーション候補は、前記無線通信ネットワークに固有であり、
前記シグナリング部は、前記端末装置の前記無線通信ネットワークへの接続の際に、前記タイミングを前記端末装置へシグナリングする、
前記(3)~(9)のいずれか1項に記載の通信制御装置。
(11)
前記設定部は、第1の端末グループのために前記リンク方向コンフィギュレーションを設定し、第2の端末グループのために別のリンク方向コンフィギュレーションを設定し、
前記シグナリング部は、前記第2の端末グループに属する端末装置へのシグナリング周期よりも短い周期で、前記第1の端末グループに属する端末装置へ前記リンク方向コンフィギュレーションをシグナリングする、
前記(2)~(10)のいずれか1項に記載の通信制御装置。
(12)
前記通信制御装置は、基地局である、前記(1)~(11)のいずれか1項に記載の通信制御装置。
(13)
前記通信制御装置は、基地局を介して前記端末装置と通信する制御ノードである、前記(1)~(11)のいずれか1項に記載の通信制御装置。
(14)
無線通信ネットワーク内で時分割複信(TDD)方式に従って端末装置により行われる無線通信を制御する通信制御方法であって、
複数のサブフレームを含むフレームの各々について、前記無線通信のためにサブフレーム単位のリンク方向を表すリンク方向コンフィギュレーションを設定することと、
設定された前記リンク方向コンフィギュレーションに依存することなく、前記無線通信において第1のリンク方向のデータ送信に関連付けられる、前記第1のリンク方向とは逆の第2のリンク方向の制御シグナリングのタイミングを設定することと、
を含む通信制御方法。
(15)
無線通信ネットワーク内で時分割複信(TDD)方式に従って端末装置により行われる無線通信を制御する通信制御装置のコンピュータを、
複数のサブフレームを含むフレームの各々について、前記無線通信のためにサブフレーム単位のリンク方向を表すリンク方向コンフィギュレーションを設定する設定部として機能させるプログラムであって、
前記設定部は、設定された前記リンク方向コンフィギュレーションに依存することなく、前記無線通信において第1のリンク方向のデータ送信に関連付けられる、前記第1のリンク方向とは逆の第2のリンク方向の制御シグナリングのタイミングを設定する、
プログラム。
(16)
時分割複信(TDD)方式で基地局と通信する無線通信部と、
前記基地局からの第1のシグナリングにより示されるリンク方向コンフィギュレーションに従い、複数のサブフレームを含むフレームの各々について、サブフレーム単位のリンク方向を設定する制御部と、
を備え、
前記制御部は、第1のリンク方向のデータ送信のタイミングと、当該データ送信に関連付けられる前記第1のリンク方向とは逆の第2のリンク方向の制御シグナリングのタイミングとの間のオフセットを、前記基地局からの第2のシグナリングに基づいて設定する、
端末装置。
(17)
時分割複信(TDD)方式で基地局と通信する無線通信部を備える端末装置により実行される無線通信方法であって、
前記基地局からの第1のシグナリングにより示されるリンク方向コンフィギュレーションに従い、複数のサブフレームを含むフレームの各々について、サブフレーム単位のリンク方向を設定することと、
第1のリンク方向のデータ送信のタイミングと、当該データ送信に関連付けられる前記第1のリンク方向とは逆の第2のリンク方向の制御シグナリングのタイミングとの間のオフセットを、前記基地局からの第2のシグナリングに基づいて設定することと、
を含む無線通信方法。
(18)
時分割複信(TDD)方式で基地局と通信する無線通信部を備える端末装置のコンピュータを、
前記基地局からの第1のシグナリングにより示されるリンク方向コンフィギュレーションに従い、複数のサブフレームを含むフレームの各々について、サブフレーム単位のリンク方向を設定する制御部、
として機能させるプログラムであって、
前記制御部は、第1のリンク方向のデータ送信のタイミングと、当該データ送信に関連付けられる前記第1のリンク方向とは逆の第2のリンク方向の制御シグナリングのタイミングとの間のオフセットを、前記基地局からの第2のシグナリングに基づいて設定する、
プログラム。
(19)
時分割複信(TDD)方式で基地局と通信する端末装置と、前記端末装置により行われる無線通信を制御する通信制御装置と、を含む通信制御システムであって、
前記通信制御装置は、
複数のサブフレームを含むフレームの各々について、前記無線通信のためにサブフレーム単位のリンク方向を表すリンク方向コンフィギュレーションを設定する設定部、
を備え、
前記設定部は、設定された前記リンク方向コンフィギュレーションに依存することなく、前記無線通信において第1のリンク方向のデータ送信に関連付けられる、前記第1のリンク方向とは逆の第2のリンク方向の制御シグナリングのタイミングを設定する、
通信制御システム。
100 通信制御装置
140 設定部
142 記憶部
150 シグナリング部
104 端末装置(レガシー端末)
200 端末装置(ダイナミックTDD端末)
210 無線通信部
230 制御部
Claims (19)
- 無線通信ネットワーク内で時分割複信(TDD)方式に従って端末装置により行われる無線通信を制御する通信制御装置であって、
複数のサブフレームを含むフレームの各々について、前記無線通信のためにサブフレーム単位のリンク方向を表すリンク方向コンフィギュレーションを設定する設定部、
を備え、
前記設定部は、設定された前記リンク方向コンフィギュレーションに依存することなく、前記無線通信において第1のリンク方向のデータ送信に関連付けられる、前記第1のリンク方向とは逆の第2のリンク方向の制御シグナリングのタイミングを設定する、
通信制御装置。 - 前記通信制御装置は、
前記設定部により設定される前記リンク方向コンフィギュレーションと前記タイミングとを前記端末装置へシグナリングするシグナリング部、
をさらに備える、請求項1に記載の通信制御装置。 - 前記設定部は、複数のコンフィギュレーション候補から選択される前記リンク方向コンフィギュレーションを前記無線通信のために設定し、
前記シグナリング部は、前記複数のコンフィギュレーション候補のうちの1つを指定することにより、前記タイミングをシグナリングする、
請求項2に記載の通信制御装置。 - 前記第1のリンク方向はダウンリンクであり、前記第2のリンク方向はアップリンクであり、
前記制御シグナリングは、ダウンリンク送信への応答として前記端末装置から送信されるACK/NACKである、
請求項3に記載の通信制御装置。 - 前記第1のリンク方向はアップリンクであり、前記第2のリンク方向はダウンリンクであり、
前記制御シグナリングは、アップリンク送信に先立って前記端末装置へ送信されるアップリンク許可である、
請求項3に記載の通信制御装置。 - 前記シグナリング部は、前記複数のコンフィギュレーション候補のうちダウンリンク比率のより高い候補を指定する、請求項4に記載の通信制御装置。
- 前記シグナリング部は、前記複数のコンフィギュレーション候補のうちアップリンク比率のより高い候補を指定する、請求項5に記載の通信制御装置。
- 前記通信制御装置は、コンフィギュレーション候補ごとに前記データ送信のタイミングと前記制御シグナリングのタイミングとを関連付けるテーブルを記憶する記憶部、をさらに備え、
前記データ送信のタイミング及び前記制御シグナリングのタイミングの一方は、前記テーブル内の指定されたコンフィギュレーション候補についてのエントリを参照することにより、他方のタイミングに基づいて決定される、
請求項6に記載の通信制御装置。 - 前記設定部は、前記無線通信ネットワーク内のアップリンクトラフィックとダウンリンクトラフィックとの間の比率に応じて、設定すべき前記リンク方向コンフィギュレーションを前記複数のコンフィギュレーション候補から選択する、請求項3に記載の通信制御装置。
- 前記複数のコンフィギュレーション候補は、前記無線通信ネットワークに固有であり、
前記シグナリング部は、前記端末装置の前記無線通信ネットワークへの接続の際に、前記タイミングを前記端末装置へシグナリングする、
請求項3に記載の通信制御装置。 - 前記設定部は、第1の端末グループのために前記リンク方向コンフィギュレーションを設定し、第2の端末グループのために別のリンク方向コンフィギュレーションを設定し、
前記シグナリング部は、前記第2の端末グループに属する端末装置へのシグナリング周期よりも短い周期で、前記第1の端末グループに属する端末装置へ前記リンク方向コンフィギュレーションをシグナリングする、
請求項2に記載の通信制御装置。 - 前記通信制御装置は、基地局である、請求項1に記載の通信制御装置。
- 前記通信制御装置は、基地局を介して前記端末装置と通信する制御ノードである、請求項1に記載の通信制御装置。
- 無線通信ネットワーク内で時分割複信(TDD)方式に従って端末装置により行われる無線通信を制御する通信制御方法であって、
複数のサブフレームを含むフレームの各々について、前記無線通信のためにサブフレーム単位のリンク方向を表すリンク方向コンフィギュレーションを設定することと、
設定された前記リンク方向コンフィギュレーションに依存することなく、前記無線通信において第1のリンク方向のデータ送信に関連付けられる、前記第1のリンク方向とは逆の第2のリンク方向の制御シグナリングのタイミングを設定することと、
を含む通信制御方法。 - 無線通信ネットワーク内で時分割複信(TDD)方式に従って端末装置により行われる無線通信を制御する通信制御装置のコンピュータを、
複数のサブフレームを含むフレームの各々について、前記無線通信のためにサブフレーム単位のリンク方向を表すリンク方向コンフィギュレーションを設定する設定部として機能させるプログラムであって、
前記設定部は、設定された前記リンク方向コンフィギュレーションに依存することなく、前記無線通信において第1のリンク方向のデータ送信に関連付けられる、前記第1のリンク方向とは逆の第2のリンク方向の制御シグナリングのタイミングを設定する、
プログラム。 - 時分割複信(TDD)方式で基地局と通信する無線通信部と、
前記基地局からの第1のシグナリングにより示されるリンク方向コンフィギュレーションに従い、複数のサブフレームを含むフレームの各々について、サブフレーム単位のリンク方向を設定する制御部と、
を備え、
前記制御部は、第1のリンク方向のデータ送信のタイミングと、当該データ送信に関連付けられる前記第1のリンク方向とは逆の第2のリンク方向の制御シグナリングのタイミングとの間のオフセットを、前記基地局からの第2のシグナリングに基づいて設定する、
端末装置。 - 時分割複信(TDD)方式で基地局と通信する無線通信部を備える端末装置により実行される無線通信方法であって、
前記基地局からの第1のシグナリングにより示されるリンク方向コンフィギュレーションに従い、複数のサブフレームを含むフレームの各々について、サブフレーム単位のリンク方向を設定することと、
第1のリンク方向のデータ送信のタイミングと、当該データ送信に関連付けられる前記第1のリンク方向とは逆の第2のリンク方向の制御シグナリングのタイミングとの間のオフセットを、前記基地局からの第2のシグナリングに基づいて設定することと、
を含む無線通信方法。 - 時分割複信(TDD)方式で基地局と通信する無線通信部を備える端末装置のコンピュータを、
前記基地局からの第1のシグナリングにより示されるリンク方向コンフィギュレーションに従い、複数のサブフレームを含むフレームの各々について、サブフレーム単位のリンク方向を設定する制御部、
として機能させるプログラムであって、
前記制御部は、第1のリンク方向のデータ送信のタイミングと、当該データ送信に関連付けられる前記第1のリンク方向とは逆の第2のリンク方向の制御シグナリングのタイミングとの間のオフセットを、前記基地局からの第2のシグナリングに基づいて設定する、
プログラム。 - 時分割複信(TDD)方式で基地局と通信する端末装置と、前記端末装置により行われる無線通信を制御する通信制御装置と、を含む通信制御システムであって、
前記通信制御装置は、
複数のサブフレームを含むフレームの各々について、前記無線通信のためにサブフレーム単位のリンク方向を表すリンク方向コンフィギュレーションを設定する設定部、
を備え、
前記設定部は、設定された前記リンク方向コンフィギュレーションに依存することなく、前記無線通信において第1のリンク方向のデータ送信に関連付けられる、前記第1のリンク方向とは逆の第2のリンク方向の制御シグナリングのタイミングを設定する、
通信制御システム。
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JP2016510560A (ja) * | 2013-02-05 | 2016-04-07 | 電信科学技術研究院 | 通信処理方法及び装置 |
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US20160044696A1 (en) | 2016-02-11 |
US9668272B2 (en) | 2017-05-30 |
JP2018067922A (ja) | 2018-04-26 |
RU2014130078A (ru) | 2016-02-10 |
JP6241416B2 (ja) | 2017-12-06 |
US9554395B2 (en) | 2017-01-24 |
BR112015009220A8 (pt) | 2019-09-17 |
EP2892291A1 (en) | 2015-07-08 |
JP6421863B2 (ja) | 2018-11-14 |
EP2892291B1 (en) | 2021-01-06 |
BR112015009220A2 (pt) | 2017-07-04 |
JPWO2014069105A1 (ja) | 2016-09-08 |
RU2627733C2 (ru) | 2017-08-11 |
EP2892291A4 (en) | 2016-08-31 |
US20140307598A1 (en) | 2014-10-16 |
IN2014DN03311A (ja) | 2015-06-26 |
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