WO2009133953A1 - 無線基地局及び通信制御方法 - Google Patents
無線基地局及び通信制御方法 Download PDFInfo
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- WO2009133953A1 WO2009133953A1 PCT/JP2009/058587 JP2009058587W WO2009133953A1 WO 2009133953 A1 WO2009133953 A1 WO 2009133953A1 JP 2009058587 W JP2009058587 W JP 2009058587W WO 2009133953 A1 WO2009133953 A1 WO 2009133953A1
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- radio resource
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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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
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/52—Allocation or scheduling criteria for wireless resources based on load
Definitions
- the present invention relates to a radio base station configured to transmit downlink data to a mobile station using downlink radio resources that are fixedly assigned at a predetermined cycle starting from a downlink radio resource allocation start point.
- the present invention relates to a station and a communication control method.
- the communication system that succeeds the W-CDMA system and the HSDPA system, that is, the LTE (Long Term Evolution) system has been studied by 3GPP, which is a W-CDMA standardization organization, and its specification is being worked on.
- OFDMA Orthogonal Frequency Multiple Access
- SC-FDMA Single-Carrier Frequency Multiple Access
- OFDMA is a system in which a frequency band is divided into a plurality of narrow frequency bands (subcarriers) and data is transmitted on each frequency band, and the subcarriers interfere with each other even though they partially overlap on the frequency. By arranging them closely, it is possible to achieve high-speed transmission and increase frequency utilization efficiency.
- SC-FDMA is a transmission method that can reduce interference between terminals by dividing a frequency band and performing transmission using different frequency bands among a plurality of terminals. Since SC-FDMA has a feature that variation in transmission power becomes small, it is possible to realize low power consumption and wide coverage of a terminal.
- the LTE system is a system that performs communication by sharing one or more physical channels between a plurality of mobile stations in both uplink and downlink.
- a channel shared by a plurality of mobile stations is generally referred to as a shared channel.
- a physical uplink shared channel Physical Uplink Shared Channel: PUSCH
- Physical downlink shared channel Physical Downlink Shared Channel: PDSCH
- the shared channel is a “uplink shared channel (UL-SCH)” in the uplink as a transport channel, and a “downlink shared channel (DL-SCH: Downlink) in the downlink. Shared Channel) ”.
- UL-SCH uplink shared channel
- DL-SCH Downlink shared channel
- the mobile station UE to which the shared channel is allocated is selected and selected for each subframe (sub-frame) (1 ms in the LTE scheme). It is necessary to signal the allocated mobile station UE to allocate a shared channel.
- the control channel used for this signaling is “physical downlink control channel (PDCCH: Physical Downlink Control Channel)” or “downlink L1 / L2 control channel (DL L1 / L2 Control Channel: Downlink L1 / L2 Control Channel) ”.
- PDCCH Physical Downlink Control Channel
- DL L1 / L2 Control Channel Downlink L1 / L2 Control Channel
- the above-described process of selecting which mobile station UE is assigned a shared channel for each subframe is generally called “scheduling”.
- the mobile station UE to which a shared channel is dynamically allocated is selected for each subframe, it may be referred to as “Dynamic scheduling”.
- the above-mentioned “allocating a shared channel” may be expressed as “allocating radio resources for the shared channel”.
- the physical downlink control channel information includes, for example, “downlink scheduling information”, “uplink scheduling grant”, and the like.
- Downlink Scheduling Information includes, for example, downlink resource block (Resource Block) allocation information, UE ID, number of streams, information on precoding vector (Precoding Vector), data size regarding downlink shared channels. , Modulation scheme, HARQ (hybrid automatic repeat request) information, and the like.
- Uplink Scheduling Grant includes, for example, uplink resource block (Resource Block) allocation information, UE ID, data size, modulation scheme, uplink transmission power information, Uplink regarding the uplink shared channel.
- Information on demodulation reference signal (demodulation reference signal) in MIMO is included.
- Downlink Scheduling Information and “Uplink Scheduling Grant” may be collectively referred to as “Downlink Control Information (DCI)”.
- DCI Downlink Control Information
- the radio base station eNB transmits a subframe (downlink radio resource allocation start time point) in which downlink scheduling information is transmitted to the mobile station UE via the PDCCH.
- a subframe downlink radio resource allocation start time point
- the above-described downlink radio resource is configured to be fixedly assigned to the mobile station at a predetermined period.
- Persistent scheduling may be referred to as “Semi-Persistent scheduling (SPS)”.
- SPS Semi-Persistent scheduling
- the radio capacity is increased by an effect called “statistical multiplexing effect”.
- the downlink radio resource (PDSCH) is transmitted at a predetermined cycle. And fixedly assigned to the mobile station UE. In such a case, it is desirable that the number of mobile stations UE multiplexed at each downlink radio resource allocation start time is equal.
- the predetermined period is 20 ms
- 10 mobile stations UE are multiplexed in one ms
- only two mobile stations UE are multiplexed in another 1 ms.
- the above-described statistical multiplexing effect is more easily obtained. This is because, in the example described above, the statistical multiplexing effect is extremely small in 1 ms where only two mobile stations UE are multiplexed.
- radio resources are arranged in an orderly manner in FIG. 10B, and the remaining radio resources (white portions) are efficiently allocated. Since it can be used, more efficient communication can be realized.
- the downlink radio resource allocation start point is specified by the uplink scheduling grant and the downlink scheduling information, and the downlink radio resource allocation start point is used as a starting point periodically and The radio resource is fixedly allocated.
- radio resources in the frequency direction cannot be flexibly allocated for each subframe (every 1 ms), so inefficient radio resource allocation as shown in FIG. Is likely to occur.
- a common channel such as a broadcast channel or a paging channel is transmitted in the downlink, and a common channel such as a random access channel is periodically transmitted in the uplink.
- the radio resource is preferentially allocated to the common channel. “Persistent scheduling” must be applied.
- the present invention has been made in view of the above-described problems, and by setting the downlink radio resources allocated by “Persistent scheduling” so as to maximize the statistical multiplexing effect, a highly efficient mobile communication system is provided. It is an object of the present invention to provide a radio base station and a communication control method that can realize the above.
- the present invention has been made in view of the above-described problems, and a radio base capable of realizing a highly efficient mobile communication system by appropriately setting downlink radio resources allocated by “Persistent scheduling”.
- An object is to provide a station and a communication control method.
- a first feature of the present invention is configured to transmit downlink data to a mobile station using downlink radio resources that are fixedly assigned at a predetermined period starting from a downlink radio resource allocation start time.
- a measurement unit configured to measure the resource usage of each time frame within the predetermined period; and the mobile station to determine the start point of allocation of downlink radio resources.
- a downlink fixed allocation signal transmitter configured to transmit the fixed allocation signal shown, and transmitting the downlink data using the downlink radio resource starting from the downlink radio resource allocation start time
- a downlink communication unit configured to transmit the downlink fixed assignment signal transmission unit based on a resource usage amount of each time frame. And summarized in that it is configured to determine a radio resource allocation start moment.
- the apparatus further comprises a setting unit configured to set a reception period in intermittent reception related to the mobile station based on a resource usage amount of each time frame within the predetermined period.
- the downlink fixed allocation signal transmission unit may be configured to determine the downlink radio resource allocation start time so that the downlink radio resource allocation start time is included in a reception period in the intermittent reception. .
- the downlink fixed allocation signal transmission unit sets the downlink radio resource allocation start time point so that a time frame with the smallest resource usage becomes the downlink radio resource allocation start time point. It may be configured to determine.
- the downlink fixed allocation signal transmission unit sets the downlink radio resource allocation start time point so that a time frame with the smallest resource usage becomes the downlink radio resource allocation start time point. It may be configured to determine.
- the setting unit may be configured to set the reception period in the intermittent reception so that the resource usage of each time frame becomes equal.
- the setting unit is configured to set a reception interval in the intermittent reception so that a total value of resource usage of time frames in the reception interval in the intermittent reception is minimized. May be.
- the downlink fixed assignment signal transmission unit receives at least one of an uplink control signal and an uplink sounding reference signal when receiving acknowledgment information for the downlink data.
- the downlink radio resource allocation start time may be determined so as not to coincide with the reception timing.
- the downlink fixed allocation signal transmission unit sets the downlink radio resource allocation start time point so that a radio resource of available acknowledgment information can be specified by the fixed allocation signal. It may be configured to determine.
- an uplink fixed assignment signal transmitter configured to transmit a fixed assignment signal indicating an uplink radio resource assignment start point to the mobile station, and the uplink radio
- An uplink communication unit configured to receive uplink data using an uplink radio resource starting from a resource allocation start time, and the downlink fixed allocation signal transmission unit includes the downlink data May be configured to determine the downlink radio resource allocation start time so that the timing of receiving the delivery confirmation information for does not coincide with the timing of receiving the uplink data.
- the measurement unit is allocated to a resource allocated to a broadcast channel, a resource allocated to a synchronization signal, a resource allocated to a dynamic broadcast channel, a resource allocated to a paging channel, and a random access response channel.
- the resource usage may be measured based on at least one of a resource to be allocated, a resource allocated to an MBMS channel, and the downlink radio resource allocated to all mobile stations in a cell.
- a second feature of the present invention is that a radio base station transmits downlink data to a mobile station using downlink radio resources that are fixedly assigned at a predetermined cycle starting from a downlink radio resource allocation start time.
- a step A in which the radio base station measures the resource usage of each time frame within the predetermined period; and the radio base station transmits the downlink radio to the mobile station.
- the radio base station determines the downlink radio resource allocation start time based on the resource usage of each time frame.
- a third feature of the present invention is configured to transmit downlink data to a mobile station using downlink radio resources that are fixedly assigned at a predetermined period starting from a downlink radio resource allocation start time.
- a downlink fixed allocation signal transmitter configured to transmit a fixed allocation signal indicating a start time of downlink radio resource allocation to the mobile station
- a downlink communication unit configured to transmit the downlink data using the downlink radio resource starting from a downlink radio resource allocation start time, and the downlink fixed allocation signal transmission unit
- the timing for receiving the acknowledgment information for the downlink data is at least one of an uplink control signal and an uplink sounding reference signal. So as not to coincide with the signal timing may be configured to determine the downlink radio resource allocation start moment.
- the uplink control signal may be downlink radio quality information or a scheduling request.
- downlink data is transmitted to a mobile station using downlink radio resources that are fixedly allocated at a predetermined period starting from a downlink radio resource allocation start point
- a radio base station configured to receive uplink data using an uplink radio resource that is fixedly assigned with a predetermined period starting from an uplink radio resource allocation start time
- the mobile station A downlink fixed allocation signal transmission unit configured to transmit a fixed allocation signal indicating the downlink radio resource allocation start time, and the downlink radio resource starting from the downlink radio resource allocation start time
- a downlink communication unit configured to transmit the used downlink data, and the mobile station, the start time of uplink radio resource allocation is indicated.
- An uplink fixed allocation signal transmission unit configured to transmit a fixed allocation signal, and reception of the uplink data using the uplink radio resource starting from the uplink radio resource allocation start time
- An uplink communication unit configured, and the downlink fixed assignment signal transmission unit, so that the timing of receiving acknowledgment information for the downlink data does not coincide with the timing of receiving the uplink data,
- the gist of the present invention is that the downlink radio resource allocation start point is determined.
- a fifth feature of the present invention is configured to transmit downlink data to a mobile station using downlink radio resources that are fixedly assigned at a predetermined period starting from a downlink radio resource allocation start time.
- a downlink fixed allocation signal transmitter configured to transmit a fixed allocation signal indicating a start time of downlink radio resource allocation to the mobile station, and
- a downlink communication unit configured to transmit the downlink data using the downlink radio resource starting from a downlink radio resource allocation start time, and the downlink fixed allocation signal transmission unit,
- the downlink radio resource allocation start time is determined so that a radio resource of usable delivery confirmation information can be designated by the fixed allocation signal. It is the gist of.
- a sixth feature of the present invention is configured to transmit downlink data to a mobile station using downlink radio resources that are fixedly assigned at a predetermined period starting from a downlink radio resource allocation start time.
- a downlink fixed allocation signal configured to transmit a fixed allocation signal indicating the downlink radio resource allocation start time and the downlink radio resource to the mobile station.
- a downlink communication unit configured to transmit the downlink data using the downlink radio resource starting from the downlink radio resource allocation start time, and the downlink fixed allocation
- the signal transmission unit includes resources allocated to the broadcast channel, resources allocated to the dynamic broadcast channel, and resources allocated to the paging channel. Scan, resources allocated to random access response channels, so as not to overlap with a resource allocated to MBMS channels, and summarized in that is configured to determine the downlink radio resource.
- the downlink fixed allocation signal transmission unit allocates the downlink radio resource from one end of all radio resource spaces in the system, and allocates the resource allocated to the broadcast channel,
- the resource allocated to the broadcast channel, the resource allocated to the paging channel, the resource allocated to the random access response channel, and the resource allocated to the MBMS channel may be configured to be allocated from the other end of the total radio resource space.
- the downlink fixed assignment signal transmission unit is configured such that a downlink radio resource determined based on downlink quality information and an error rate reported from the mobile station is different from the downlink radio resource.
- the fixed assignment signal may be transmitted.
- the downlink fixed allocation signal transmission unit is configured to transmit the fixed allocation signal when a predetermined time or more has elapsed after transmitting the fixed allocation signal. It may be.
- a seventh feature of the present invention is configured to transmit downlink data to a mobile station using downlink radio resources that are fixedly assigned at a predetermined period starting from a downlink radio resource allocation start time.
- a transmission state management unit configured to manage a transmission state of the mobile station, and the downlink radio resource allocation start time and the downlink radio resource for the mobile station
- a downlink fixed allocation signal transmission unit configured to transmit a fixed allocation signal indicating the transmission of the downlink data using the downlink radio resource starting from the downlink radio resource allocation start time
- a downlink communication unit configured as described above, wherein the downlink fixed assignment signal transmission unit is in a state in which the transmission state of the mobile station is off and the mobile station is addressed to the mobile station.
- the fixed allocation signal is transmitted when the data size of the mobile station is larger than the first threshold and the size of the data addressed to the mobile station is smaller than the second threshold.
- An eighth feature of the present invention is configured to transmit downlink data to a mobile station using downlink radio resources that are fixedly assigned with a predetermined period starting from a downlink radio resource allocation start time.
- a downlink fixed allocation signal configured to transmit a fixed allocation signal indicating the downlink radio resource allocation start time and the downlink radio resource to the mobile station.
- a transmission unit, and a downlink communication unit configured to transmit the downlink data using the downlink radio resource starting from the downlink radio resource allocation start point and receive delivery confirmation information for the downlink data;
- the downlink fixed allocation signal transmitter is a delivery for the initial transmission of the downlink data immediately after the downlink radio resource allocation start time
- the fixed allocation signal is transmitted when the decoding result of the acknowledgment information is DTX, or when the decoding result of the delivery confirmation information for the initial transmission of the downlink data is NACK or DTX continuously for a predetermined number of times or more.
- a ninth feature of the present invention is that a radio base station transmits downlink data to a mobile station using downlink radio resources that are fixedly assigned with a predetermined period starting from a downlink radio resource allocation start time.
- a communication control method for performing wireless communication wherein the radio base station transmits a fixed allocation signal indicating the downlink radio resource allocation start time and the downlink radio resource to the mobile station; and The station has a step B of transmitting the downlink data using the downlink radio resource starting from the downlink radio resource allocation start time determined by the fixed assignment signal, and in the step A, The radio base station has resources allocated to the broadcast channel, resources allocated to the dynamic broadcast channel, resources allocated to the paging channel, Resources allocated to random access response channels so as not to overlap with a resource allocated to MBMS channels, and summarized in that determining the downlink radio resource.
- a tenth feature of the present invention is that a radio base station transmits downlink data to a mobile station using downlink radio resources that are fixedly assigned at a predetermined cycle starting from a downlink radio resource allocation start time.
- the wireless base station manages the transmission state of the mobile station, and the wireless base station performs the downlink radio resource allocation start time and the mobile station with respect to the mobile station.
- An eleventh feature of the present invention is that a radio base station transmits downlink data using a downlink radio resource that is fixedly assigned to a mobile station at a predetermined cycle starting from a downlink radio resource allocation start time.
- a communication control method for performing wireless communication wherein the radio base station transmits a fixed allocation signal indicating the downlink radio resource allocation start time and the downlink radio resource to the mobile station; and A step B in which a station transmits the downlink data using the downlink radio resource starting from the downlink radio resource allocation start time determined by the fixed allocation signal and receives acknowledgment information for the downlink data;
- the radio base station determines the delivery confirmation information for the initial transmission of the downlink data immediately after the downlink radio resource allocation start time.
- the fixed allocation signal is transmitted when the result of the transmission is DTX, or when the decoding result of the acknowledgment information for the initial transmission of the downlink data is NACK or DTX continuously for a predetermined number of times or more. The gist.
- a highly efficient mobile communication system can be realized by setting the downlink radio resource allocated by “Persistent scheduling” so as to maximize the statistical multiplexing effect.
- a radio base station and a communication control method can be provided.
- FIG. 1 is an overall configuration diagram of a mobile communication system according to a first embodiment of the present invention.
- FIG. 2 is a functional block diagram of the radio base station according to the first embodiment of the present invention.
- FIG. 3 is a diagram for explaining the operation of the RB usage calculation unit of the radio base station according to the first embodiment of the present invention.
- FIG. 4 is a flowchart for explaining the operation of the RB usage calculation unit of the radio base station according to the first embodiment of the present invention.
- FIG. 5 is a diagram for explaining the operation of the DRX ON section setting processing unit of the radio base station according to the first embodiment of the present invention.
- FIG. 6 is a flowchart for explaining the operation of the Talk Spurt state management unit of the radio base station according to the first embodiment of the present invention.
- FIG. 1 is an overall configuration diagram of a mobile communication system according to a first embodiment of the present invention.
- FIG. 2 is a functional block diagram of the radio base station according to the first embodiment of the present invention.
- FIG. 7 is a diagram illustrating an example of a “Persistent DL TFR table” used in the Talk Spurt state management unit of the radio base station according to the first embodiment of the present invention.
- FIG. 8 is a diagram illustrating an example of a transmission format selected by the Talk Spurt state management unit of the radio base station according to the first embodiment of the present invention.
- FIG. 9 is a diagram illustrating an example of a “Persistent DL TFR table (Initial)” used in the Talk Spurt state management unit of the radio base station according to the first embodiment of the present invention.
- FIG. 10 is a diagram illustrating an example of a radio resource allocation method in the mobile communication system.
- FIG. 11 is a diagram for explaining the operation of the Talk Spurt state management unit of the radio base station according to the first embodiment of the present invention.
- FIG. 12 is a diagram for explaining the operation of the Talk Spurt state management unit of the radio base station according to the first embodiment of the present invention.
- Mobile communication system according to the first embodiment of the present invention A mobile communication system according to a first embodiment of the present invention will be described with reference to FIG. 1 to FIG.
- an LTE mobile communication system is described as an example, but the present invention is also applicable to other mobile communication systems.
- FIG. 1 shows a mobile communication system 1000 that uses a radio base station (eNB: eNode B) 200 according to an embodiment of the present invention.
- eNB radio base station
- the mobile communication system 1000 is a system to which, for example, the “Evolved UTRA and UTRAN (also known as LTE or Super 3G) system” is applied.
- Evolved UTRA and UTRAN also known as LTE or Super 3G system
- the mobile communication system 1000 includes a radio base station 200 and a plurality of mobile stations (UE: User Equipment) 100 1 to 100 n (n is an integer where n> 0).
- UE User Equipment
- the radio base station 200 is connected to an upper station, for example, the access gateway device 300, and the access gateway device 300 is connected to the core network 400.
- the access gateway device may be referred to as MME / SGW (Mobility Management Entity / Serving Gateway).
- the mobile station 100 n is configured to communicate with the radio base station 200 in the cell 50 by the “Evolved UTRA and UTRAN” method.
- each of the mobile stations 100 1 to 100 n has the same configuration, function, and state, the following description will be given as the mobile station 100 n unless otherwise specified.
- the mobile station 100 n communicates with the radio base station 200, but more generally, the mobile station 100 n includes both mobile terminals and fixed terminals. Or the mobile station UE may be called a user apparatus.
- OFDMA orthogonal frequency division multiple access
- SC-FDMA single carrier-frequency division multiple access
- OFDMA is a multicarrier transmission scheme in which a frequency band is divided into a plurality of narrow frequency bands (subcarriers) and data is mapped to each subcarrier for communication.
- SC-FDMA is a frequency band. Is a single carrier transmission scheme in which interference between terminals is reduced by dividing each terminal into a plurality of terminals, and a plurality of terminals using different frequency bands.
- a “physical downlink shared channel (PDSCH)” and a “physical downlink control channel (PDCCH)” shared by each mobile station 100 n are used.
- the “physical downlink control channel (PDCCH)” is also referred to as “downlink L1 / L2 control channel”.
- information mapped to “physical downlink control channel (PDCCH)” may be referred to as “downlink control information (DCI)”.
- PDSCH physical downlink shared channel
- DL-SCH Downlink Shared Channel
- downlink / uplink scheduling grants, transmission power control command bits, and the like are transmitted by the “physical downlink control channel (PDCCH)”.
- PDCCH physical downlink control channel
- the “downlink scheduling grant (DL Scheduling Grant)” includes, for example, the ID of the user who performs communication using the “physical downlink shared channel (PDSCH)”, and information on the transport format of the user data (that is, data Size, modulation scheme, HARQ information), downlink resource block allocation information, and the like.
- downlink scheduling grant may be referred to as downlink scheduling information (Downlink Scheduling Information).
- Downlink Scheduling Information Downlink Scheduling Information
- the “uplink scheduling grant” also includes, for example, the ID of the user who performs communication using the “physical uplink shared channel (PUSCH)” and the transport format information of the user data (ie, data Information on the size and modulation method, allocation information of uplink resource blocks, information on transmission power of uplink shared channels, and the like).
- PUSCH physical uplink shared channel
- transport format information of the user data ie, data Information on the size and modulation method, allocation information of uplink resource blocks, information on transmission power of uplink shared channels, and the like.
- an “uplink resource block” corresponds to a frequency resource and is also called a “resource unit”.
- the OFDM symbol to which “physical downlink control channel (PDCCH)” is mapped includes “physical control channel format indicator channel (PCFICH)” and “physical HARQ indicator channel (PHICH)”.
- PCFICH physical control channel format indicator channel
- PHICH physical HARQ indicator channel
- the “physical downlink control channel (PDCCH)”, “physical control channel format indicator channel (PCFICH)” and “physical HARQ indicator channel (PHICH)” are multiplexed and transmitted on a predetermined number or less of OFDM symbols. .
- PCFICH Physical control channel format indicator channel
- Physical HARQ indicator channel is a channel for transmitting acknowledgment information for “physical uplink shared channel (PUSCH)”.
- Such downlink quality information may be referred to as “CSI (Channel State Indicator)” which is an indicator that summarizes “CQI”, “PMI (Pre-coding Matrix Indicator)”, and “RI (Rank Indicator)”. .
- CSI Channel State Indicator
- PMI Pre-coding Matrix Indicator
- RI Rank Indicator
- the delivery confirmation information is expressed by “ACK” as an affirmative response or “NACK” as a negative response.
- PCFICH physical control channel format indicator channel
- PHICH physical HARQ indicator channel
- PCFICH physical control channel format indicator channel
- PHICH physical HARQ indicator channel
- a “downlink reference signal (DL RS)” is transmitted as a pilot signal commonly used between the mobile stations UE.
- the “downlink reference signal” includes the “physical downlink shared channel (PDSC)”, “physical downlink control channel (PDCCH)”, “physical control channel format indicator channel (PCFICH)”, and “physical HARQ indicator channel ( PHICH) ”is used for channel estimation and calculation of CQI which is downlink radio quality information.
- PDSC physical downlink shared channel
- PDCCH physical downlink control channel
- PCFICH physical control channel format indicator channel
- PHICH physical HARQ indicator channel
- PUSCH physical uplink shared channel
- uplink control channels There are two types of uplink control channels for the LTE scheme: a channel transmitted as a part of a “physical uplink shared channel (PUSCH)” and a frequency multiplexed channel.
- PUSCH physical uplink shared channel
- the frequency-multiplexed channel is referred to as a “physical uplink control channel (PUCCH: Physical Uplink Control Channel)”.
- PUCCH Physical Uplink Control Channel
- PUSCH Physical uplink shared channel
- the transport channel mapped to the “physical uplink shared channel (PUSCH)” is “UL-SCH (Uplink Shared Channel)”.
- the quality information of the downlink for use in scheduling processing, adaptive modulation and coding processing (AMCS: Adaptive Modulation and Coding Scheme) of the "physical downlink shared channel (PDSCH)" by the uplink control channel for LTE scheme (CQI: Channel Quality Indicator) and “physical downlink shared channel (PDSCH)” acknowledgment information are transmitted.
- AMCS Adaptive Modulation and Coding Scheme
- the content of the delivery confirmation information is expressed by either an acknowledgment (ACK) or a negative response (NACK).
- ACK acknowledgment
- NACK negative response
- Radio base station 200 uses the downlink radio resource (PDSCH) that is fixedly allocated to the mobile station 100 at a predetermined cycle starting from the downlink radio resource allocation start point. It is configured to send data.
- PDSCH downlink radio resource
- the radio base station 200 includes an RB usage calculation processing unit 11, a DRX ON section setting processing unit 12, a Talk Spurt state management unit 13, and a PDSCH transmission processing unit 14.
- the RB usage amount calculation processing unit 11 is configured to calculate a resource usage amount for each subframe (time frame) within the persistent scheduling transmission period (predetermined period), as will be described later.
- resource is a frequency resource
- resource usage is more specifically the amount or number of resource blocks.
- one resource block is “180 kHz” and one subframe is “1 ms”.
- the RB usage amount calculation processing unit 11 calculates the resource usage amount for each subframe in the 20 subframes.
- the DRX ON section setting processing unit 12 is configured to set a reception section (ON section in the DRX state) in the intermittent reception of each mobile station 100 n in the cell 50.
- the DRX ON section setting processing unit 12 is configured to set the DRX ON section based on the resource usage calculated by the RB usage calculation processing unit 11.
- the Talk Spurt state management unit 13 is configured to manage the Talk Spurt state of each mobile station in the cell, that is, whether or not to perform resource allocation by persistent scheduling.
- resource allocation by persistent scheduling means “physical downlink shared channel (PDSCH)” that is fixedly assigned at a predetermined period starting from the start point of downlink radio resource allocation, that is, using downlink radio resources, This corresponds to transmitting downlink data.
- PDSCH physical downlink shared channel
- the Talk Spurt state management unit 13 may perform uplink “resource allocation by persistent scheduling”.
- an uplink radio resource allocation start point is determined, and the uplink radio resource allocation start point and the uplink radio resource allocation start point are used as starting points.
- the uplink radio resource is notified to the mobile station UE by a fixed allocation signal.
- the radio base station is configured to receive an uplink data signal (UL-SCH) transmitted from the mobile station UE via the uplink radio resource.
- UL-SCH uplink data signal
- the PDSCH transmission processing unit 14 to be described later may be configured to perform the reception processing related to the uplink described above.
- the PDSCH transmission processing unit 14 “physically assigned to a mobile station 100 n whose Talk Spurt state is“ ON ”is fixedly assigned at a predetermined period starting from the start point of downlink radio resource assignment. It is configured to transmit downlink data using “downlink shared channel (PDSCH)”, that is, downlink radio resources.
- PDSCH downlink shared channel
- the delivery confirmation information reception processing unit 15 is configured to receive delivery confirmation information for “physical downlink shared channel (PDSCH)”, that is, downlink radio resources.
- PDSCH physical downlink shared channel
- the state mismatch detection processing unit 16 detects a state mismatch between the radio base station eNB and the mobile station UE, as will be described later.
- state mismatch means, for example, that the mobile base station eNB assigns the downlink radio resource to the mobile station UE by the persistent scheduling, even though the radio base station eNB assigns the downlink radio resource to the mobile station UE. A state in which resources are not recognized as being allocated.
- the PDCCH to which the “Downlink Scheduling Information” is mapped, that is, a fixed allocation signal is transmitted.
- such a fixed allocation signal that is, the PDCCH that notifies the initial transmission resource for persistent scheduling may be referred to as a PDCCH in which the CRC is masked by the SPS-RNTI.
- SPS is an abbreviation for Semi-Persistent Scheduling.
- a subframe within a predetermined period is defined as “Persistent Sub-frame”, and the RB usage calculation processing unit 11 relates to each “Persistent Sub-frame” with a resource usage (hereinafter referred to as DL_Resource ( m) and description) are configured.
- m indicates the index of “Persistent Sub-frame”
- M indicates the total number (predetermined cycle) of “Persistent Sub-frame”.
- the resource usage DL_Resource (m) for each “Persistent Sub-frame” is “SCH (synchronization signal) / P-BCH (broadcast channel)” or “D-BCH (motion channel)” in “Persistent Sub-frame #m”.
- Resource “ PCH (paging channel) ”,“ RACH response channel (random access response channel) ”,“ MBMS channel ”, and resources allocated to“ DL-SCH ”to which persistent scheduling is applied. This corresponds to the number of blocks (Resource Block (RB)).
- the D-BCH may be more specifically SIB1 or System Information (SI) Message. That is, it may be called D-BCH as a generic term for SIB1 or SI message. Moreover, SI may be comprised from 1 or more System Information Blocks (SIB) other than SIB1.
- SIB System Information Blocks
- the resource usage is measured for each “Persistent Sub-frame” by the loop constituted by Steps S401, S409, and S410.
- step S402 the value of “DL_Resource (m)” in “Persistent Sub-frame #m” is initialized by the following expression.
- step S403 the value of “RB SCH / P-BCH ” is added to the value of “DL_Resource (m)” by the following equation.
- DL_Resource (m) + RB SCH / P-BCH
- RB SCH / P-BCH indicates whether “SCH (Synchronization Channel)” or “P-BCH (Physical Broadcast Channel)” is transmitted in “Persistent Sub-frame #m”. Is calculated as follows.
- SCH is also called a synchronization signal or “Synchronization Signal”.
- step S404 the value of “RB D-BCH ” is added to the value of “DL_Resource (m)” by the following equation.
- RB D-BCH is based on whether or not “D-BCH (Dynamic Broadcast Channel)” may be transmitted in “Persistent Sub-frame #m”. Calculated as follows:
- “S1, S2...” Is an index indicating the type of “D-BCH”
- “RB S1 ” and “RB S2 ” are “D-BCH” of S1 and “D-BCH” of S2, respectively. This is the number of resource blocks allocated to “BCH”.
- “weight S2 ” and “weight S2 ” are weighting coefficients.
- SI is an abbreviation for System Information.
- the number of resource blocks is counted for all “D-BCH” that may be transmitted in “Persistent Sub-frame #m”.
- the transmission cycle of “D-BCH” may be longer than the predetermined cycle described above. In such a case, there is a case where “D-BCH” is transmitted and a case where it is not transmitted among certain “Persistent Sub-frame #m”. Therefore, it is possible to adjust the influence on the resource usage of the transmission cycle of “D-BCH” described above by the weighting coefficients “weight S1 , weight S2 ,...”.
- step S404 when “D-BCH” may be transmitted in “Persistent Sub-frame #m”, the number of resource blocks allocated to “D-BCH” is determined as the resource usage. Counted as quantity DL_Resource (m).
- step S405 “RB PCH ” is added to the value of “DL_Resource (m)” by the following equation.
- DL_Resource (m) + RB PCH
- RB PCH is based on the time average value (RB PCH, average ) of the number of resource blocks (number of RBs) of “PCH (paging channel)” transmitted in “Persistent Sub-frame #m” in the past. It is calculated as follows.
- weight PCH RB PCH, average x weight PCH
- step S405 the average number of resource blocks allocated to “PCH” is counted as the resource usage DL_Resource (m).
- step S406 “RB RACH, res ” is added to the value of “DL_Resource (m)” by the following equation.
- DL_Resource (m) + RB RACH, res “RB RACH, res ” is based on the time average value (RB RACHres, average ) of the number of resource blocks (number of RBs) of “RACH response” transmitted in “Persistent Sub-frame #m” in the past. Is calculated as follows.
- weight RACHres RB RACHres, average x weight RACHres
- step S407 “RB MBMS ” is added to the value of “DL_Resource (m)” by the following equation.
- DL_Resource (m) + RB MBMS, tmp “RB MBMS ” is calculated as follows based on whether or not MBMS may be transmitted in “Persistent Sub-frame #m”.
- Weight MBMS is a weighting coefficient for correcting the influence of the MBMS transmission period.
- step S407 when there is a possibility that “MBMS channel” may be transmitted in “Persistent Sub-frame #m”, the number of resource blocks allocated to “MBMS channel” is determined by the resource usage DL_Resource. Counted as (m).
- step S408 “RB Persistent, DL ” is added to the value of “DL_Resource (m)” by the following equation.
- DL_Resource (m) + RB Persistent, DL “RB Persistent, DL ” is the number of resource blocks (number of RBs) of downlink data (including both new transmission and retransmission) to which resources are allocated by persistent scheduling, which was transmitted in “Persistent Sub-frame #m” in the past. ) Based on the time average value (RB Persistent, average, DL ).
- RB Persistent, DL RB Persistent, average, DL ⁇ weight Persistent, DL
- the number of resource blocks is set as follows. The calculation may be performed as “number of resource blocks (number of RBs) of downlink data (including both new transmission and retransmission) to which resources are allocated by persistent scheduling”.
- Persistent Sub-frame #m when downlink data to which resources are allocated by a plurality of “Persistent scheduling” is transmitted, the number of RBs of the downlink data to which resources are allocated by a plurality of “Persistent scheduling” The total value is defined as “number of resource blocks (number of RBs) of downlink data (including both new transmission and retransmission) to which resources are allocated by persistent scheduling”.
- weight Persistent, DL is a coefficient for adjusting to what extent the downlink data resources to which resources are allocated by “Persistent scheduling” are reserved.
- step S408 the number of resource blocks allocated to downlink data to which resources are allocated by “Persistent scheduling” in “Persistent Sub-frame #m” is counted as resource usage DL_Resource (m).
- the DRX ON section setting process performed by the DRX ON section setting processing unit 12 will be described in detail with reference to FIG.
- DRX control intermittent reception control
- the DRX control is a signal from the radio base station eNB when there is no data amount to be communicated or when the data amount to be communicated is a data amount that can be transmitted only by resources allocated by “Persistent scheduling”.
- the wireless base station eNB and the mobile station are divided into a section (ON section, reception section in intermittent reception) and a section that does not receive a signal from the radio base station eNB (OFF section, non-receiving section in intermittent reception). It is control that communication between UEs is performed.
- the mobile station UE since the mobile station UE does not need to transmit an uplink signal and receive a downlink signal in the OFF section, as a result, it is possible to reduce power consumption.
- the DRX ON section setting processing unit 12 may set the DRX ON section of the mobile station UE based on the resource usage (RB usage) calculated by the RB usage calculation processing unit 11.
- the DRX ON section setting processing unit 12 may set the DRX ON section so that the resource usage of “Persistent Sub-frame” included in the ON section is minimized.
- the predetermined period is “20 ms”, “Persistent Sub-frame # 0 to # 19” is defined, and the resource usage amount is “2”, respectively. ,..., 2, 5 ”.
- the DRX ON section setting processing unit 12 sets “Persistent Sub-frame # 0, # 1” as the DRX ON section of the mobile station UE.
- Persistent Sub-frame set as a DRX ON section for a certain mobile station UE depends on downlink radio resources allocated to the mobile station UE by “Persent scheduling” as will be described later. Since downlink data is transmitted, the resource usage increases as a result.
- the process of setting the ON section of DRX is sequentially performed on the mobile stations UE in the cell so that the resource usage of “Persistent Sub-frame” included in the ON section described above is minimized.
- the DRX ON section is set so that the resource usage of each “Persistent Sub-frame” becomes equal.
- each “persistent sub-frame resource usage is equal” indicates that resources are allocated more orderly, and as a result, resources are allocated efficiently.
- the DRX ON section setting processing unit 12 sets the DRX ON section so that the resource usage of “Persistent Sub-frame” included in the ON section is minimized.
- the DRX ON section may be set so that the position of the ON section is random between the mobile stations UE in the cell.
- the Talk Spurt state management performed by the Talk Spurt state management unit 13 will be described in detail with reference to FIG.
- the Talk Spurt state management unit 13 manages the downlink Talk Spurt state of the mobile station UE to which resources are allocated by “Persistent scheduling”.
- the following processing is performed for the mobile station UE (including both the mobile station UE in the DRX state and the mobile station UE in the NON-DRX state) whose subframe is the first subframe in the DRX ON section. Applied.
- N indicates an index of “the mobile station UE whose subframe is the first subframe in the DRX ON section”, and “N” indicates “the first subframe in the DRX ON section. The total number of “mobile stations UE that are subframes”.
- DRX control is not performed in the cell, the process described later is performed for all mobile stations UE to which resource allocation is performed in the cell at a rate of once per predetermined period. It may be broken.
- the subframe is a mobile station UE that is the first subframe in the ON section of DRX (mobile stations UE and NON ⁇ in the DRX state). This process is applied to both mobile stations UE in the DRX state).
- step S602 it is determined whether or not resource allocation is performed for the mobile station UE # n by “Persistent scheduling”.
- whether or not resource allocation is performed by “Persistent scheduling” may be determined based on whether or not a logical channel defined to perform resource allocation by “Persistent scheduling” is set.
- step S602 If the result of step S602 is OK, the process proceeds to step S603, and if the result of step S602 is NG, the process proceeds to step S616.
- step S603 based on the following formula, a time average value “CQI wideband, average ” of CQI (Wideband CQI, hereinafter referred to as CQI wideband ) of the entire system bandwidth reported from the mobile station UE is calculated. .
- the “CQI wideband, average ” may be calculated using the dB average value of the two CQIs.
- the CQI value may be calculated as a true value or a dB value.
- CQI wideband, average (1- ⁇ ) x CQI wideband + ⁇ x CQI wideband, average ⁇ : Wideband CQI average forgetting factor Further, the following offset processing is applied to “CQI wideband, average ”.
- CQI adjusted CQI wideband, average + Offset persistent
- the offset value “Offset persistent ” is based on the “DL-SCH” delivery confirmation information (including CRC check result, both initial transmission and retransmission) to which “Persistent scheduling” is applied. (The processing of the following equation).
- Offset persistent is adjusted for each mobile station UE.
- I indicates an index of the mobile station UE.
- step S603 the process proceeds to step S603A.
- step S604 the radio base station eNB has data that can be transmitted for a logical channel to which “Persistent scheduling” of the mobile station UE is applied, and the data size is the first threshold value. It is determined whether or not it is equal to or smaller than “Threshold data_size ” and the data size is equal to or larger than the second threshold “Threshold data_size, SID ”.
- the data size is not more than the first threshold “Threshold data_size ”, and the data size is not less than the second threshold “Threshold data_size, SID ”, “OK” is returned. Otherwise, “NG” is returned.
- the process proceeds to step S608 (1st TX TF NULL Check).
- step S604 and S605 are demonstrated below.
- the upper limit value corresponds to the first threshold value “Threshold data_size ”.
- SID packet a packet called “SID packet” is transmitted when there is no sound.
- Such a SID packet is a packet that is transmitted when there is no sound, and is not a packet transmitted at a constant transmission rate such as voice. Therefore, resource allocation based on “Persistent scheduling” should not be performed for such a SID packet. .
- a lower limit is set, and if the size of data that can be transmitted is smaller than the lower limit, there is data to be transmitted. However, it is determined that the downlink radio resource is not allocated by “Persistent scheduling”, and “NG” is determined in the above-described processing.
- this lower limit value corresponds to the second threshold value “Threshold data_size, SID ”.
- step S606 the radio base station eNB continues the state where there is no data that can be transmitted with respect to the logical channel to which the “persistent scheduling” of the mobile station UE is applied as “Timer BDC2 ” or more. It is determined whether or not.
- the radio base station eNB can transmit the logical channel to which the above-described “Persistent scheduling” of the mobile station UE is applied. Regardless of whether or not the state in which no data exists continues for “Timer BDC2 ” or more, OK may be returned in this process.
- the uplink synchronization state is NG, for example, the UL synchronization state may not be established, or the Time Alignment Timer for maintaining the UL timing synchronization is It may be in the state of Expired or not activated.
- the resource for the first transmission of “Persistent scheduling” assigned to the mobile station UE is released.
- resource for initial transmission of persistent scheduling refers to a downlink radio resource assigned by persistent scheduling.
- Such release of resources for the initial transmission may be performed implicitly or may be performed explicitly by signaling such as an RRC message.
- the radio base station eNB sends the Dowlink Scheduling Information to the mobile station UE instructing the release of the resources for the initial transmission in the latest Sub-frame in the DRX reception timing (DRX ON section) of the mobile station UE. Notify them.
- the radio base station eNB may notify the mobile station UE of such Downlink Scheduling Information regardless of whether the UL synchronization state of the mobile station UE is NG.
- the UL synchronization state is NG, for example, the UL synchronization state may not be established, or the Time Alignment Timer for maintaining the UL timing synchronization is Expired. Alternatively, it may be in a state where it is not activated.
- the radio base station eNB releases the above-described initial transmission resource upon receiving the delivery confirmation information ACK for the Downlink Scheduling Information. May be performed.
- the radio base station eNB may release the above-described initial transmission resources at the time of transmitting the Downlink Scheduling Information.
- step S606 and step S607 are demonstrated below.
- a packet to which resources are allocated by “Persistent scheduling” is a voice packet, there may be no packet to be transmitted even during a conversation.
- step S608 (1st TX TF NULL Check), it is determined whether or not “DL_1st_TX_TF” of the mobile station UE is “NULL”.
- DL — 1st_TX_TF of the mobile station UE is a variable indicating the state of the downlink radio resource allocated to the mobile station UE by “Persistent scheduling”, and “DL — 1st_TX_TF” of the mobile station UE.
- "Is" NULL “" indicates that there is no downlink radio resource allocated by "Persistent scheduling” for the mobile station UE.
- step S608 if there is no downlink radio resource allocated by the “persistent scheduling” for the mobile station UE by the process in step S608, the process proceeds to steps S612, S613, S614, and S615.
- a process of assigning downlink radio resources is performed by “Persistent scheduling”.
- step S608 downlink by the “Persistent scheduling” already allocated for the mobile station UE. It progresses to the process (step S609, S609A, S610, S611) for determining whether it should change a radio
- Step S609 Temporal 1 st TX TF Selection
- TF Temporal 1 st TX TF Selection
- CQI adjusted may be used instead of “CQI wideband, average ”.
- a table in which “CQI wideband, average ” in FIG. 7 is replaced with “CQI adjusted ” may be used.
- a threshold of “CQI wideband, average (UP)” is used, and a transition is made to a transmission format larger than the current transmission format (DL_1st_TX_TF).
- a threshold value of “CQI wideband, average (DOWN)” is used.
- the transmission format is determined by the data size (payload size), the modulation method (Modulation), and the number of resource blocks (number of RBs).
- the value of CQI must be “8” or more.
- step 609 After the processing of “Temporary 1st TX TF Selection” in step 609, the process proceeds to the processing of “Updating TTT, Timer reconf ” in step S610.
- step S609A In the process of “Updating TTT, Timer reconf ” in step S609A, “TTT DL, persistent, Down ”, “TTT DL, persistent, Up ” and “Timer DL, reconf ” are updated by the following process.
- TTT persistent check
- Step S613 If the result of “TTT DL, persistent Check” is “OK”, the process proceeds to “Persistent Sub-frame Selection” in Step S613. If the result of “TTT DL, persistent Check” is “NG”, the process proceeds to Step S613. The process proceeds to “Persistent Sub-frame Reconfiguration Check” in S611.
- TTTT DL, persistent, Down is the optimal transmission format (TF)
- Temporary_DL_1st_TX_TF is smaller than the current transmission format (DL_1st_TX_TF) to the current transmission format (DL_1st_TX_TF).
- step S610 when the threshold “Th DL, TTT ” for “TTT DL, persistent, Down ” in step S610 is set to “200 ms”, “Temporary_DL — 1st_TX_TF”, which is the optimal transmission format (TF), is the current transmission format.
- DL_1st_TX_TF the state of being smaller than (DL_1st_TX_TF) exceeds “200 ms”
- the result of “TTT DL, persistent Check” in step S610 is “OK”, and is assigned by “Persistent scheduling” in steps S613, S614, and S615. Processing for changing the downlink radio resource is performed.
- TTT DL, persistent, Up in Steps 609A and S610 is substantially the same as the description regarding “TTT DL, persistent, Down ”, and is omitted.
- step S611 it is determined whether or not “Timer DL, reconf ” is equal to or greater than “Th DL, reconf ” for the mobile station UE.
- step S611 the effect of the control by the process of step S611 will be described.
- step 611 when downlink data is transmitted using downlink radio resources allocated by the same “Personent scheduling” continuously for a predetermined time interval “Timer DL, reconf ”, the downlink radio resources are Be changed.
- the simplest method for changing from the state shown in FIG. 10A to the state shown in FIG. 10B is to set “PDCCH” to all mobile stations UE in the state shown in FIG. In other words, the downlink radio resource allocated by “persistent scheduling” is changed.
- step S611 when the process in step S611 is used, the process of changing the downlink radio resources allocated by “Persistent scheduling” of all mobile stations at an appropriate time interval (Timer DL, reconf ) is applied. It is possible to bring the state shown in FIG. 10 (A) close to the state shown in FIG. 10 (B) to an appropriate level by a simple amount of “PDCCH” and by simple processing.
- CQI adjusted may be used instead of “CQI wideband, average ”.
- a table in which “CQI wideband, average ” in FIG. 7 is replaced with “CQI adjusted ” may be used.
- TTT DL, persistent, Up 0
- TTTT DL, persistent, Down 0
- this transmission format is, for example, the transmission format shown in FIG.
- step S612 the process proceeds to step S613.
- Persistent Sub-frame (DL — 1st_TX_Persistent_Subframe)” for the initial transmission of “DL-SCH” to which “Persistent scheduling” is applied refers to the time when downlink radio resource allocation starts.
- Persistent Sub-frame that is the DRX reception timing of the mobile station UE and has the smallest resource usage “DL_Resource (m)” is set to “Candidate_Subframe” of the mobile station UE. To select.
- the resource usage DL_Resource (m) is assigned for the initial transmission of the DL-SCH to which persistent scheduling is applied in the loop processing configured by steps S601, S616, and S617. Radio resources may be included.
- the radio resource for the initial transmission of SCH may be considered in such DL_Resource (m).
- the “Persistent Sub-frame number” is the most.
- a small “Persistent Sub-frame” may be selected as “Candidate_Subframe” of the mobile station UE.
- the value of the variable is changed by the following processing.
- step S613 a process of allocating a subframe with a small resource usage as a downlink radio resource allocation start time to a mobile station UE to which a downlink radio resource is allocated by “Persistent scheduling”.
- This process transmits data to which radio resources are allocated by “Persistent scheduling” in subframes where the amount of downlink radio resources used is small, reducing collisions with other signals and enabling efficient communication. It becomes.
- the Candidate_Sub-frame receives the uplink control signal or the uplink sounding reference signal at the timing of receiving the delivery confirmation information for “DL-SCH” to which “Persistent scheduling” is applied. It may be selected differently from the timing.
- # 0 to # 5 are defined as the DRX reception timing of the mobile station UE.
- the uplink sub-frame and the downlink sub-frame match.
- Persistent Sub-frame # 4 is the transmission timing of the uplink control signal or the uplink sounding reference signal from the viewpoint of the mobile station UE, and from the viewpoint of the radio base station, This is the reception timing of an uplink control signal or an uplink sounding reference signal transmitted from.
- the uplink control signal may be, for example, downlink radio quality information CQI (Channel Quality Indicator) or a scheduling request signal (SR: Scheduling Request). That is, the mobile station UE transmits CQI or SR to the radio base station in Persistent Sub-frame # 4.
- CQI Channel Quality Indicator
- SR Scheduling Request
- the selection of “Candidate_Sub-frame” described above is performed based on the reception timing of the uplink control signal or the uplink sounding reference signal. For example, in the example shown in FIG. 11, the DRX reception timing of the mobile station UE is # 0 to # 5, and the Persistent Sub-frame that can be selected as the Candidate Sub-frame is as follows.
- Persistent Sub-frame # 0 The reception timing of the delivery confirmation information for the DL-SCH is Persistent Sub-frame # 4.
- Persistent Sub-frame # 1 The reception timing of the delivery confirmation information for the DL-SCH is Persistent Sub-frame # 5.
- Persistent Sub-frame # 2 The reception timing of the delivery confirmation information for the DL-SCH is Persistent Sub-frame # 6.
- Persistent Sub-frame # 3 The reception timing of delivery confirmation information for the DL-SCH is Persistent Sub-frame # 7.
- Persistent Sub-frame # 4 The reception timing of the delivery confirmation information for the DL-SCH is Persistent Sub-frame # 8.
- Persistent Sub-frame # 5 The reception timing of the delivery confirmation information for the DL-SCH is Persistent Sub-frame # 9. Of the six Persistent Sub-frames that can be selected as the Candidate Sub-frame, Persistent Sub-frame # 0 has the reception timing (when viewed from the radio base station) of the corresponding delivery confirmation information. This coincides with the reception timing of the control signal or uplink sounding reference signal.
- the “Candidate_Sub-frame” of the mobile station UE is assigned, for example, such that the reception timing of the corresponding acknowledgment information does not coincide with the reception timing of the uplink control signal or the uplink sounding reference signal. May be.
- Persistent Sub-frames other than Persistent Sub-frame # 0 may be assigned as Candidate Sub-frames.
- the “Persistent Sub-frame” having the smallest value of the resource usage DL_Resource (m) may be selected as “Candidate_Sub-frame” of the mobile station UE.
- the delivery confirmation information includes the uplink control signal or the uplink sounding reference signal. Since it is multiplexed and transmitted, the transmission characteristics may be degraded.
- the amount of information transmitted increases, and as a result, the required signal power increases.
- the Persistent Sub-frame # 0 is selected as the Candidate_Sub-frame, the delivery confirmation information or the uplink control signal is normally transmitted. Less likely.
- Candidate_Sub-frame so that the reception timing of the corresponding delivery confirmation information does not coincide with the reception timing of the uplink control signal or the uplink sounding reference signal, the above-described degradation of the transmission characteristics is achieved. It becomes possible to reduce.
- the Candidate_Subf-frame receives UL-SCH to which uplink Persistent scheduling is applied at the timing of receiving delivery confirmation information for “DL-SCH” to which “Persistent scheduling” is applied. It may be selected differently from the timing.
- # 0 to # 5 are defined as the DRX reception timing of the mobile station UE.
- the uplink sub-frame and the downlink sub-frame match.
- the uplink radio resource to which the mobile station UE is assigned by persistent scheduling is assigned to Persistent Sub-frame # 4.
- Persistent Sub-frame # 4 is the transmission timing of the uplink data signal (UL-SCH) to which Persistent scheduling is applied from the viewpoint of the mobile station UE, and from the viewpoint of the radio base station, This is a reception timing of an uplink data signal (UL-SCH) transmitted from the mobile station UE and applied with persistent scheduling.
- UL-SCH uplink data signal
- the selection of “Candidate_Sub-frame” described above is performed based on the reception timing of the uplink data signal (UL-SCH) to which the persistent scheduling is applied.
- the DRX reception timing of the mobile station UE is # 0 to # 5
- the Persistent Sub-frame that can be selected as the Candidate Sub-frame is as follows.
- Persistent Sub-frame # 0 The reception timing of the delivery confirmation information for the DL-SCH is Persistent Sub-frame # 4.
- Persistent Sub-frame # 1 The reception timing of the delivery confirmation information for the DL-SCH is Persistent Sub-frame # 5.
- Persistent Sub-frame # 2 The reception timing of the delivery confirmation information for the DL-SCH is Persistent Sub-frame # 6.
- Persistent Sub-frame # 3 The reception timing of delivery confirmation information for the DL-SCH is Persistent Sub-frame # 7.
- Persistent Sub-frame # 4 The reception timing of the delivery confirmation information for the DL-SCH is Persistent Sub-frame # 8.
- Persistent Sub-frame # 5 The reception timing of the delivery confirmation information for the DL-SCH is Persistent Sub-frame # 9. Of the six Persistent Sub-frames that can be selected as Candidate Sub-frames, Persistent Sub-frame # 0 has the corresponding delivery confirmation information reception timing (when viewed from the radio base station) as the Persistent scheduling. Coincides with the reception timing of the uplink data signal (UL-SCH) to which is applied.
- UL-SCH uplink data signal
- the “Candidate_Sub-frame” of the mobile station UE is, for example, that the reception timing of the corresponding acknowledgment information does not match the reception timing of the uplink data signal (UL-SCH) to which the persistent scheduling is applied. May be assigned as follows.
- Persistent Sub-frames other than Persistent Sub-frame # 0 may be assigned as Candidate Sub-frames.
- the DRX reception timing of the mobile station UE and the reception timing of the corresponding acknowledgment information matches the reception timing of the uplink data signal (UL-SCH) to which the persistent scheduling is applied.
- “Persistent Sub-frame” having the smallest value of the resource usage DL_Resource (m) may be selected as “Candidate_Sub-frame” of the mobile station UE.
- the delivery confirmation information is the uplink to which the persistent scheduling is applied. Since the data signal (UL-SCH) is multiplexed and transmitted, the transmission characteristics may be deteriorated.
- the acknowledgment information and the uplink data signal (UL-SCH) to which the persistent scheduling is applied are multiplexed, the amount of transmitted information increases, and as a result, the required signal power Will increase.
- the Persistent Sub-frame # 0 is selected as the Candidate_Sub-frame
- the data signal (UL-SCH) to which the delivery confirmation information or the persistent scheduling is applied. ) Is less likely to be transmitted normally.
- Candidate_Sub-frame so that the reception timing of the corresponding delivery confirmation information does not coincide with the reception timing of the uplink data signal (UL-SCH) to which the persistent scheduling is applied, It becomes possible to reduce deterioration of transmission characteristics.
- the Candidate_Sub-frame may be selected from a sub-frame other than a PUCCH resource index of available ACK / NACK by “TPC command for PUCCH” in the DL Scheduling Information.
- the “available PUCCH resource index for ACK / NACK” refers to a “PUCCH resource index that is not used by other UEs”.
- steps S613 and S614 may be skipped.
- the radio base station eNB may designate a PUCCH resource index of an ACK / NACK that can be used by “TPC command for PUCCH” at the DRX reception timing of the mobile station UE and “DLPC Scheduling Information”.
- Persistent Sub-frame that is a possible Sub-frame and has the smallest value of the resource usage DL_Resource (m) may be selected as“ Candidate_Sub-frame ”of the mobile station UE.
- the TPC command for PUCCH in the Downlink Scheduling Information is used as a bit for specifying an ACK / NACK radio resource.
- an information element other than the TPC command for PUCCH is used for the ACK.
- / NACK may be used as a bit for specifying a radio resource.
- the mobile station UE When the available ACK / NACK radio resource, that is, the PUCCH resource index cannot be specified by the TPC command for PUCCH in the Downlink Scheduling Information, the mobile station UE cannot transmit the delivery confirmation information in the uplink.
- step S613 the process proceeds to step S614.
- the “Resource block” (hereinafter referred to as DL_1st_TX_Persistent_RB) for the initial transmission of “DL-SCH” to which “Persistent scheduling” is applied to the mobile station UE by the processing of “Persistent RB Selection” in step S614. decide.
- Resource allocation type 2 in Non-Patent Document 3 (TS36.213) may be used for allocation of the transmission band of “DL-SCH” to which “Persistent scheduling” is applied.
- Resource allocation type 1 may be used instead of “Resource allocation type 2”, or “Resource allocation type 0” may be used. In the following description, it is assumed that “Resource allocation type 2” is used.
- step S608 As shown below, based on the determination results of step S608, step S610, and step S611, an assignment process of “Resource block” for the initial transmission of “DL-SCH” to which “Persistent scheduling” is applied is performed. .
- step S608 is “OK”
- “Virtual Resource Block (VRB) index” is the smallest and assignable resource block (RB) is selected as “Rand_RB” _ To do.
- Virtual Resource Block index is an index of a virtual resource block in “Resource allocation type 2”.
- step S610 the operation when the determination result in step S610 is “OK” will be described.
- “DL_1st_TX_Persistent_Subframe” of the mobile station UE when “Temporary_DL_1st_TX_TF” is transmitted, ““ Virtual Resource Block (VRB) index ”is the smallest and R that can be assigned is selected as“ R ”.
- VRB Virtual Resource Block
- “Candidate_RB” is a resource block allocated by “Persistent scheduling”.
- the radio resource for the initial transmission of DL-SCH to which persistent scheduling is applied regarding the mobile station UE is returned to the state before performing the processes of steps S613 and S614 described above.
- step S611 The operation when the determination result in step S611 is “OK” will be described.
- “Virtual Resource Block (VRB) index is the smallest and allocatable RB” is selected as “Candidate_RB”.
- “Candidate_RB” is a resource block allocated by “Persistent scheduling”.
- the radio resource for the initial transmission of DL-SCH to which persistent scheduling is applied regarding the mobile station UE is returned to the state before performing the processes of steps S613 and S614 described above.
- the frequency resource (resource block) of the downlink radio resource to which “Persistent scheduling” is applied is determined by the process of step S614.
- an RB with the smallest “Virtual Resource Block (VRB) index” and an assignable RB is assigned, while “PCH” or “RACH response” is assigned.
- “Virtual Resource Block (VRB) index” and the allocable RB may be allocated to a common channel such as "D-BCH”.
- step S614 the process proceeds to step S615.
- step S615 the transmission power of the downlink radio resource (PDSCH) to which “Persistent scheduling” is applied is determined.
- the transmission power may be calculated based on CQI or may be a fixed value.
- the delivery confirmation information reception processing unit 15 receives delivery confirmation information for a downlink radio resource (PDSCH) to which “Persistent scheduling” transmitted from each mobile station UE is applied.
- PDSCH downlink radio resource
- the delivery confirmation information reception processing unit 15 may determine three values of “ACK”, “NACK”, and “DTX” when receiving the delivery confirmation information, or “ACK” and “DTX”.
- the binary value of “NACK” may be determined.
- the state mismatch detection process performed by the state mismatch detection processing unit 16 will be described below.
- the state mismatch detection processing unit 16 detects a state mismatch between the radio base station eNB and the mobile station UE.
- the “state mismatch” means that, for example, the radio base station eNB assigns the downlink radio resource to the mobile station UE by “Persistent scheduling”, but the mobile station UE This refers to a state where it is not recognized that downlink radio resources have been allocated.
- the radio base station eNB sets “DL_1st_TX_TF” of the mobile station UE to “NULL” when at least one of the following events occurs.
- initial transmission includes only when the transmission of SPS is instructed by Downlink Scheduling Information, and does not include the case of not instructing transmission of SPS by Downlink Scheduling Information.
- the above “initial transmission” includes both cases in which SPS transmission is instructed by Downlink Scheduling Information and when “DL — 1st_TX_TF” is set to “NULL”, and “OK” is performed in the process of step S608 described above. Therefore, the downlink radio resource allocated by “Persistent scheduling” is reassigned, and the above-described state mismatch between the radio base station eNB and the mobile station UE can be resolved.
- a high-efficiency mobile communication system can be realized by setting downlink radio resources allocated by “Persistent scheduling” so as to maximize the statistical multiplexing effect.
- a radio base station and a communication control method can be provided.
- a radio base station and communication control capable of realizing a highly efficient mobile communication system by appropriately setting the downlink radio resources allocated by “Persistent scheduling”.
- a method can be provided.
- the operations of the mobile station and the radio base station described above may be implemented by hardware, may be implemented by a software module executed by a processor, or may be implemented by a combination of both.
- the software modules include RAM (Random Access Memory), flash memory, ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electronically Erasable and Programmable, Removable ROM, Hard Disk, and Removable ROM).
- RAM Random Access Memory
- flash memory ROM (Read Only Memory)
- EPROM Erasable Programmable ROM
- EEPROM Electrically Erasable and Programmable, Removable ROM, Hard Disk, and Removable ROM.
- it may be provided in a storage medium of an arbitrary format such as a CD-ROM.
- Such a storage medium is connected to the processor so that the processor can read and write information from and to the storage medium. Further, such a storage medium may be integrated in the processor. Further, such a storage medium and a processor may be provided in the ASIC. Such an ASIC may be provided in a mobile station or a radio base station. Further, the storage medium and the processor may be provided in the mobile station or the radio base station as discrete components.
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Abstract
Description
図1乃至図12を参照して、本発明の第1の実施形態に係る移動通信システムについて説明する。なお、本実施形態では、LTE方式の移動通信システムを例に挙げて説明するが、本発明は、他方式の移動通信システムにも適用可能である。
次に、かかる移動通信システム1000で使用される各種の通信チャネルについて説明する。
また、本実施形態に係る無線基地局200は、移動局100に対して、下り無線リソース割当開始時点を起点として所定周期で固定的に割り当てられている下り無線リソース(PDSCH)を用いて、下りデータを送信するように構成されている。
次に、ステップS403において、以下の式により、「DL_Resource(m)」の値に、「RBSCH/P-BCH」の値が加算される。
なお、「RBSCH/P-BCH」は、「Persistent Sub-frame #m」において、「SCH(Synchronization Channel、同期チャネル)」或いは「P-BCH(Physical Broadcast Channel)」が送信されるか否かに基づいて、以下のように計算される。ここで、「SCH」は、同期信号、或いは、「Synchronization Signal」とも呼ばれる。
なお、「RBD-BCH」は、「Persistent Sub-frame #m」において、「D-BCH(Dynamic Broadcast Channel、動的報知チャネル)」が送信される可能性があるか否かに基づいて、以下のように計算される。
「RBPCH」は、過去に「Persistent Sub-frame #m」において送信された「PCH(ページングチャネル)」のリソースブロック数(RB数)の時間平均値(RBPCH,average)に基づいて、以下のように計算される。
なお、重み付け係数「weightPCH」は、「PCH」のためのリソースを、どの程度まで確保するかを調節するための係数であり、例えば、「PCH」のためのリソースの変動量が大きく、「PCH」のためのリソースを余分に確保する必要がある場合には、「weightPCH=2」と設定されてもよい。
「RBRACH,res」は、過去に「Persistent Sub-frame #m」において送信された「RACH response」のリソースブロック数(RB数)の時間平均値(RBRACHres, average)に基づいて、以下のように計算される。
なお、重み付け係数「weightRACHres」は、「RACH response」のためのリソースを、どの程度まで確保するかを調節するための係数であり、例えば、「RACH response」のためのリソースの変動量が大きく、「RACH response」のためのリソースを余分に確保する必要がある場合には、「weightPCH=2」と設定されてもよい。
「RBMBMS」は、「Persistent Sub-frame #m」において、MBMSが送信される可能性があるか否かに基づいて、以下のように計算される。
「RBPersistent, DL」は、過去に「Persistent Sub-frame #m」において送信された、Persistentスケジューリングによりリソースが割り当てられた下りデータ(新規送信及び再送の両方を含む)のリソースブロック数(RB数)の時間平均値(RBPersistent, average, DL)に基づいて、以下のように計算される。
なお、実際には、「Dynamicスケジューリング」によりリソースの割り当てが行われた下りデータに関しても、「Persistentスケジューリング」によるリソースの割り当てが行われる予定の下りデータが含まれる場合には、そのリソースブロック数を「Persistentスケジューリングによりリソースが割り当てられた下りデータ(新規送信及び再送の両方を含む)のリソースブロック数(RB数)」として計算を行ってもよい。
Temporary_DL_1st_TX_TF
OLD_DL_1st_TX_TF
UE_DL_1st_TX_TF
DL_1st_TX_Persistent_Subframe
OLD_DL_1st_TX_Persistent_Subframe
Candidate_Subframe
DL_1st_TX_Persistent_RB
OLD_DL_1st_TX_Persistent_RB
Candidate_RB
図6に示すように、ステップS601、S616、S617により構成されるループにより、当該サブフレームがDRXのON区間内の先頭のサブフレームである移動局UE(DRX状態にある移動局UE及びNON-DRX状態にある移動局UEの両方を含む)に対して、当該処理が適用される。
α: Wideband CQI平均用の忘却係数
さらに、「CQIwideband, average」に対して、以下のオフセット処理が適用される。
ここで、オフセット値「Offsetpersistent」は、「Persistentスケジューリング」が適用される「DL-SCH」の送達確認情報(CRCチェック結果、初回送信及び再送の両方を含む)に基づいて、Outer-Loop的に調節される(以下の式の処理)。
TTTDL,persistent,Down+=1
TTTDL,persistent,Up=0
TimerDL,reconf+=1
}
else if(DL_1st_TX_TF<Temporary_DL_1st_TX_TF){
TTTDL,persistent,Up+=1
TTTDL,persistent,Down=0
TimerDL,reconf+=1
}
else {
TTTDL,persistent,Down=0
TTTDL,persistent,Up=0
TimerDL,reconf+=1
}
ステップS609Aの「Updating TTT、Timerreconf」の処理の後、ステップS610の「TTTpersistent Check」の処理に進む。
DL_1st_TX_Persistent_Subframe=Candidate_Subframe
とする。
● Persistent Sub-frame #1(該DL-SCHに対する送達確認情報の受信タイミングは、Persistent Sub-frame#5
● Persistent Sub-frame #2(該DL-SCHに対する送達確認情報の受信タイミングは、Persistent Sub-frame#6
● Persistent Sub-frame #3(該DL-SCHに対する送達確認情報の受信タイミングは、Persistent Sub-frame#7
● Persistent Sub-frame #4(該DL-SCHに対する送達確認情報の受信タイミングは、Persistent Sub-frame#8
● Persistent Sub-frame #5(該DL-SCHに対する送達確認情報の受信タイミングは、Persistent Sub-frame#9
前記6個の、Candidate Sub-frameとして選択可能なPersistent Sub-frameの内、Persistent Sub-frame#0は、対応する送達確認情報の受信タイミング(無線基地局から見た場合)が、前記上りリンクの制御信号又は上りリンクのサウンディングリファレンス信号の受信タイミングに一致する。
● Persistent Sub-frame #1(該DL-SCHに対する送達確認情報の受信タイミングは、Persistent Sub-frame#5
● Persistent Sub-frame #2(該DL-SCHに対する送達確認情報の受信タイミングは、Persistent Sub-frame#6
● Persistent Sub-frame #3(該DL-SCHに対する送達確認情報の受信タイミングは、Persistent Sub-frame#7
● Persistent Sub-frame #4(該DL-SCHに対する送達確認情報の受信タイミングは、Persistent Sub-frame#8
● Persistent Sub-frame #5(該DL-SCHに対する送達確認情報の受信タイミングは、Persistent Sub-frame#9
前記6個の、Candidate Sub-frameとして選択可能なPersistent Sub-frameの内、Persistent Sub-frame#0は、対応する送達確認情報の受信タイミング(無線基地局から見た場合)が、前記Persistentスケジューリングが適用される上りリンクのデータ信号(UL-SCH)の受信タイミングに一致する。
なお、「DL_1st_TX_TF」を「NULL」とした場合、上述したステップS608の処理で「OK」と判定されるため、「Persistentスケジューリング」により割り当てられる下り無線リソースが割り当てられ直すことになり、上述した無線基地局eNBと移動局UEとの間の状態の不一致を解消することが可能となる。
なお、上述の移動局や無線基地局の動作は、ハードウェアによって実施されてもよいし、プロセッサによって実行されるソフトウェアモジュールによって実施されてもよいし、両者の組み合わせによって実施されてもよい。
Claims (30)
- 移動局に対して、下り無線リソース割当開始時点を起点として所定周期で固定的に割り当てられている下り無線リソースを用いて、下りデータの送信を行うように構成されている無線基地局であって、
前記所定周期内の各タイムフレームのリソース使用量を測定するように構成されている測定部と、
前記移動局に対して、前記下り無線リソース割当開始時点を示す固定的割当信号を送信するように構成されている下りリンク固定的割当信号送信部と、
前記下り無線リソース割当開始時点を起点とした前記下り無線リソースを用いた前記下りデータの送信を行うように構成されている下りリンク通信部とを具備し、
前記下りリンク固定的割当信号送信部は、前記各タイムフレームのリソース使用量に基づいて、前記下り無線リソース割当開始時点を決定するように構成されていることを特徴とする無線基地局。 - 前記所定周期内の各タイムフレームのリソース使用量に基づいて、前記移動局に関する間欠受信における受信区間を設定するように構成されている設定部を更に具備し、
前記下りリンク固定的割当信号送信部は、前記下り無線リソース割当開始時点が前記間欠受信における受信区間内に含まれるように、前記下り無線リソース割当開始時点を決定するように構成されていることを特徴とする請求項1に記載の無線基地局。 - 前記下りリンク固定的割当信号送信部は、前記リソース使用量が最も小さいタイムフレームが前記下り無線リソース割当開始時点となるように、前記下り無線リソース割当開始時点を決定するように構成されていることを特徴とする請求項1に記載の無線基地局。
- 前記下りリンク固定的割当信号送信部は、前記リソース使用量が最も小さいタイムフレームが前記下り無線リソース割当開始時点となるように、前記下り無線リソース割当開始時点を決定するように構成されていることを特徴とする請求項2に記載の無線基地局。
- 前記設定部は、各タイムフレームのリソース使用量が均等になるように、前記間欠受信における受信区間を設定するように構成されていることを特徴とする請求項2に記載の無線基地局。
- 前記設定部は、前記間欠受信における受信区間内のタイムフレームのリソース使用量の合計値が最小となるように、該間欠受信における受信区間を設定するように構成されていることを特徴とする請求項2に記載の無線基地局。
- 前記下りリンク固定的割当信号送信部は、前記下りデータに対する送達確認情報を受信するタイミングが、上りリンクの制御信号及び上りリンクのサウンディングリファレンス信号の少なくとも1つを受信するタイミングと一致しないように、前記下り無線リソース割当開始時点を決定するように構成されていることを特徴とする請求項1に記載の無線基地局。
- 前記下りリンク固定的割当信号送信部は、前記下りデータに対する送達確認情報を受信するタイミングが、上りリンクの制御信号及び上りリンクのサウンディングリファレンス信号の少なくとも1つを受信するタイミングと一致しないように、前記下り無線リソース割当開始時点を決定するように構成されていることを特徴とする請求項2に記載の無線基地局。
- 前記下りリンク固定的割当信号送信部は、前記下りデータに対する送達確認情報を受信するタイミングが、上りリンクの制御信号及び上りリンクのサウンディングリファレンス信号の少なくとも1つを受信するタイミングと一致しないように、前記下り無線リソース割当開始時点を決定するように構成されていることを特徴とする請求項3に記載の無線基地局。
- 前記下りリンク固定的割当信号送信部は、前記固定的割当信号により、利用可能な送達確認情報の無線リソースを指定できるように、前記下り無線リソース割当開始時点を決定するように構成されていることを特徴とする請求項1に記載の無線基地局。
- 前記下りリンク固定的割当信号送信部は、前記固定的割当信号により、利用可能な送達確認情報の無線リソースを指定できるように、前記下り無線リソース割当開始時点を決定するように構成されていることを特徴とする請求項2に記載の無線基地局。
- 前記下りリンク固定的割当信号送信部は、前記固定的割当信号により、利用可能な送達確認情報の無線リソースを指定できるように、前記下り無線リソース割当開始時点を決定するように構成されていることを特徴とする請求項3に記載の無線基地局。
- 前記移動局に対して、上り無線リソース割当開始時点を示す固定的割当信号を送信するように構成されている上りリンク固定的割当信号送信部と、
前記上り無線リソース割当開始時点を起点とした上り無線リソースを用いた上りデータの受信を行うように構成されている上りリンク通信部とをさらに具備し、
前記下りリンク固定的割当信号送信部は、前記下りデータに対する送達確認情報を受信するタイミングが、前記上りデータを受信するタイミングと一致しないように、前記下り無線リソース割当開始時点を決定するように構成されていることを特徴とする請求項1に記載の無線基地局。 - 前記移動局に対して、上り無線リソース割当開始時点を示す固定的割当信号を送信するように構成されている上りリンク固定的割当信号送信部と、
前記上り無線リソース割当開始時点を起点とした上り無線リソースを用いた上りデータの受信を行うように構成されている上りリンク通信部とをさらに具備し、
前記下りリンク固定的割当信号送信部は、前記下りデータに対する送達確認情報を受信するタイミングが、前記上りデータを受信するタイミングと一致しないように、前記下り無線リソース割当開始時点を決定するように構成されていることを特徴とする請求項2に記載の無線基地局。 - 前記移動局に対して、上り無線リソース割当開始時点を示す固定的割当信号を送信するように構成されている上りリンク固定的割当信号送信部と、
前記上り無線リソース割当開始時点を起点とした上り無線リソースを用いた上りデータの受信を行うように構成されている上りリンク通信部とをさらに具備し、
前記下りリンク固定的割当信号送信部は、前記下りデータに対する送達確認情報を受信するタイミングが、前記上りデータを受信するタイミングと一致しないように、前記下り無線リソース割当開始時点を決定するように構成されていることを特徴とする請求項3に記載の無線基地局。 - 前記測定部は、報知チャネルに割り当てられるリソース、同期信号に割り当てられるリソース、動的報知チャネルに割り当てられるリソース、ページングチャネルに割り当てられるリソース、ランダムアクセス応答チャネルに割り当てられるリソース、MBMSチャネルに割り当てられるリソース、セル内の全移動局に割り当てられる前記下り無線リソースの少なくとも1つに基づいて、前記リソース使用量を測定するように構成されていることを特徴とする請求項1に記載の無線基地局。
- 無線基地局が、移動局に対して、下り無線リソース割当開始時点を起点として所定周期で固定的に割り当てられている下り無線リソースを用いて、下りデータの送信を行う通信制御方法であって、
前記無線基地局が、前記所定周期内の各タイムフレームのリソース使用量を測定する工程Aと、
前記無線基地局が、前記移動局に対して、前記下り無線リソース割当開始時点を示す固定的割当信号を送信する工程Bと、
前記無線基地局が、前記下り無線リソース割当開始時点を起点とした前記下り無線リソースを用いた前記下りデータの送信を行う工程Cとを有し、
前記工程Bにおいて、前記無線基地局が、前記各タイムフレームのリソース使用量に基づいて、前記下り無線リソース割当開始時点を決定することを特徴とする通信制御方法。 - 移動局に対して、下り無線リソース割当開始時点を起点として所定周期で固定的に割り当てられている下り無線リソースを用いて、下りデータの送信を行うように構成されている無線基地局であって、
前記移動局に対して、前記下り無線リソース割当開始時点を示す固定的割当信号を送信するように構成されている下りリンク固定的割当信号送信部と、
前記下り無線リソース割当開始時点を起点とした前記下り無線リソースを用いた前記下りデータの送信を行うように構成されている下りリンク通信部とを具備し、
前記下りリンク固定的割当信号送信部は、前記下りデータに対する送達確認情報を受信するタイミングが、上りリンクの制御信号及び上りリンクのサウンディングリファレンス信号の少なくとも1つを受信するタイミングと一致しないように、前記下り無線リソース割当開始時点を決定するように構成されていることを特徴とする無線基地局。 - 前記上りリンクの制御信号は、下りリンクの無線品質情報又はスケジューリング要求であることを特徴とする請求項18に記載の無線基地局。
- 移動局に対して、下り無線リソース割当開始時点を起点として所定周期で固定的に割り当てられている下り無線リソースを用いて、下りデータの送信を行い、かつ、上り無線リソース割当開始時点を起点として所定周期で固定的に割り当てられている上り無線リソースを用いて、上りデータの受信を行うように構成されている無線基地局であって、
前記移動局に対して、前記下り無線リソース割当開始時点を示す固定的割当信号を送信するように構成されている下りリンク固定的割当信号送信部と、
前記下り無線リソース割当開始時点を起点とした前記下り無線リソースを用いた前記下りデータの送信を行うように構成されている下りリンク通信部と、
前記移動局に対して、前記上り無線リソース割当開始時点を示す固定的割当信号を送信するように構成されている上りリンク固定的割当信号送信部と、
前記上り無線リソース割当開始時点を起点とした前記上り無線リソースを用いた前記上りデータの受信を行うように構成されている上りリンク通信部とを具備し、
前記下りリンク固定的割当信号送信部は、前記下りデータに対する送達確認情報を受信するタイミングが、前記上りデータを受信するタイミングと一致しないように、前記下り無線リソース割当開始時点を決定するように構成されていることを特徴とする無線基地局。 - 移動局に対して、下り無線リソース割当開始時点を起点として所定周期で固定的に割り当てられている下り無線リソースを用いて、下りデータの送信を行うように構成されている無線基地局であって、
前記移動局に対して、前記下り無線リソース割当開始時点を示す固定的割当信号を送信するように構成されている下りリンク固定的割当信号送信部と、
前記下り無線リソース割当開始時点を起点とした前記下り無線リソースを用いた前記下りデータの送信を行うように構成されている下りリンク通信部とを具備し、
前記下りリンク固定的割当信号送信部は、前記固定的割当信号により、利用可能な送達確認情報の無線リソースを指定できるように、前記下り無線リソース割当開始時点を決定するように構成されていることを特徴とする無線基地局。 - 移動局に対して、下り無線リソース割当開始時点を起点として所定周期で固定的に割り当てられている下り無線リソースを用いて、下りデータの送信を行うように構成されている無線基地局であって、
前記移動局に対して、前記下り無線リソース割当開始時点及び前記下り無線リソースを示す固定的割当信号を送信するように構成されている下りリンク固定的割当信号送信部と、
前記下り無線リソース割当開始時点を起点とした前記下り無線リソースを用いた前記下りデータの送信を行うように構成されている下りリンク通信部とを具備し、
前記下りリンク固定的割当信号送信部は、報知チャネルに割り当てられるリソース、動的報知チャネルに割り当てられるリソース、ページングチャネルに割り当てられるリソース、ランダムアクセス応答チャネルに割り当てられるリソース、MBMSチャネルに割り当てられるリソースと重ならないように、前記下り無線リソースを決定するように構成されていることを特徴とする無線基地局。 - 前記下りリンク固定的割当信号送信部は、前記下り無線リソースを、システム内の全無線リソース空間の一方の端から割り当て、前記報知チャネルに割り当てられるリソース、動的報知チャネルに割り当てられるリソース、ページングチャネルに割り当てられるリソース、ランダムアクセス応答チャネルに割り当てられるリソース、MBMSチャネルに割り当てられるリソースを、該全無線リソース空間の他方の端から割り当てるように構成されていることを特徴とする請求項22に記載の無線基地局。
- 前記下りリンク固定的割当信号送信部は、前記移動局から報告される下り品質情報及び誤り率に基づいて決定される下り無線リソースが、前記下り無線リソースと異なる場合に、前記固定的割当信号を送信するように構成されていることを特徴とする請求項23に記載の無線基地局。
- 前記下りリンク固定的割当信号送信部は、前記固定的割当信号を送信してから所定時間以上経過した場合に、前記固定的割当信号を送信するように構成されていることを特徴とする請求項23に記載の無線基地局。
- 移動局に対して、下り無線リソース割当開始時点を起点として所定周期で固定的に割り当てられている下り無線リソースを用いて、下りデータの送信を行うように構成されている無線基地局であって、
前記移動局の送信状態を管理するように構成されている送信状態管理部と、
前記移動局に対して、前記下り無線リソース割当開始時点及び前記下り無線リソースを示す固定的割当信号を送信するように構成されている下りリンク固定的割当信号送信部と、
前記下り無線リソース割当開始時点を起点とした前記下り無線リソースを用いた前記下りデータの送信を行うように構成されている下りリンク通信部とを具備し、
前記下りリンク固定的割当信号送信部は、前記移動局の送信状態がオフであり、かつ、該移動局宛てのデータのサイズが第1閾値よりも大きく、かつ、該移動局宛てのデータのサイズが第2閾値よりも小さい場合に、前記固定的割当信号を送信するように構成されていることを特徴とする無線基地局。 - 移動局に対して、下り無線リソース割当開始時点を起点として所定周期で固定的に割り当てられている下り無線リソースを用いて、下りデータの送信を行うように構成されている無線基地局であって、
前記移動局に対して、前記下り無線リソース割当開始時点及び前記下り無線リソースを示す固定的割当信号を送信するように構成されている下りリンク固定的割当信号送信部と、
前記下り無線リソース割当開始時点を起点とした前記下り無線リソースを用いた前記下りデータの送信及び該下りデータに対する送達確認情報の受信を行うように構成されている下りリンク通信部とを具備し、
前記下りリンク固定的割当信号送信部は、前記下り無線リソース割当開始時点の直後の前記下りデータの初回送信に対する送達確認情報の復号結果がDTXであった場合、或いは、前記下りデータの初回送信に対する送達確認情報の復号結果が連続して所定回数以上NACK又はDTXであった場合に、前記固定的割当信号を送信するように構成されていることを特徴とする無線基地局。 - 無線基地局が、移動局に対して、下り無線リソース割当開始時点を起点として所定周期で固定的に割り当てられている下り無線リソースを用いて、下りデータの送信を行う通信制御方法であって、
前記無線基地局が、前記移動局に対して、前記下り無線リソース割当開始時点及び前記下り無線リソースを示す固定的割当信号を送信する工程Aと、
前記無線基地局が、前記固定的割当信号により決定される前記下り無線リソース割当開始時点を起点とした前記下り無線リソースを用いた前記下りデータの送信を行う工程Bとを有し、
前記工程Aにおいて、前記無線基地局は、前記報知チャネルに割り当てられるリソース、動的報知チャネルに割り当てられるリソース、ページングチャネルに割り当てられるリソース、ランダムアクセス応答チャネルに割り当てられるリソース、MBMSチャネルに割り当てられるリソースと重ならないように、前記下り無線リソースを決定することを特徴とする通信制御方法。 - 無線基地局が、移動局に対して、下り無線リソース割当開始時点を起点として所定周期で固定的に割り当てられている下り無線リソースを用いて、下りデータの送信を行う通信制御方法であって、
前記無線基地局が、前記移動局の送信状態を管理する工程Aと、
前記無線基地局が、前記移動局に対して、前記下り無線リソース割当開始時点及び前記下り無線リソースを示す固定的割当信号を送信する工程Bと、
前記無線基地局が、前記固定的割当信号により決定される前記下り無線リソース割当開始時点を起点とした前記下り無線リソースを用いた前記下りデータの送信を行う工程Cとを有し、
前記工程Bにおいて、前記無線基地局は、前記移動局の送信状態がオフであり、かつ、該移動局宛てのデータのサイズが第1閾値よりも大きく、かつ、該移動局宛てのデータのサイズが第2閾値よりも小さい場合に、前記固定的割当信号を送信することを特徴とする通信制御方法。 - 無線基地局が、移動局に対して、下り無線リソース割当開始時点を起点として所定周期で固定的に割り当てられている下り無線リソースを用いて、下りデータの送信を行う通信制御方法であって、
前記無線基地局が、前記移動局に対して、前記下り無線リソース割当開始時点及び前記下り無線リソースを示す固定的割当信号を送信する工程Aと、
前記無線基地局が、前記固定的割当信号により決定される前記下り無線リソース割当開始時点を起点とした前記下り無線リソースを用いた前記下りデータの送信及び該下りデータに対する送達確認情報の受信を行う工程Bとを有し、
前記工程Aにおいて、前記無線基地局は、前記下り無線リソース割当開始時点直後の前記下りデータの初回送信に対する送達確認情報の復号結果がDTXであった場合、或いは、前記下りデータの初回送信に対する送達確認情報の復号結果が連続して所定回数以上NACK又はDTXであった場合に、前記固定的割当信号を送信することを特徴とする通信制御方法。
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2012109954A (ja) * | 2010-11-15 | 2012-06-07 | Ntt Docomo Inc | 物理層シグナリングの伝送方法およびその装置 |
WO2013035467A1 (ja) * | 2011-09-09 | 2013-03-14 | 株式会社エヌ・ティ・ティ・ドコモ | 基地局及び通信制御方法 |
US9992005B2 (en) | 2009-12-03 | 2018-06-05 | Huawei Technologies Co., Ltd. | Method, base station, and user equipment for feeding back ACK/NACK information for carrier aggregation |
CN110583061A (zh) * | 2017-03-02 | 2019-12-17 | 株式会社Ntt都科摩 | 用户终端及无线通信方法 |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005041609A1 (ja) * | 2003-10-27 | 2005-05-06 | Fujitsu Limited | 接続先基地局決定装置 |
CN102017756A (zh) * | 2008-05-02 | 2011-04-13 | 株式会社Ntt都科摩 | 无线基站和通信控制方法 |
CN101925004B (zh) * | 2009-06-17 | 2016-12-07 | 中兴通讯股份有限公司 | 基于多播广播业务的动态调度信息的处理方法和装置 |
EP2553857A4 (en) * | 2010-03-31 | 2014-05-28 | Samsung Electronics Co Ltd | RESOURCE INDEXATION FOR TRANSMISSION OF RECEIVE ACCUSED SIGNALS IN TIME DIVISION DUPLEX MULTICELLULAR COMMUNICATION SYSTEMS |
US9125221B2 (en) * | 2011-01-12 | 2015-09-01 | Nokia Solutions And Networks Oy | Method and apparatus for allocating radio resources in cellular communications network |
US10028250B2 (en) * | 2011-07-29 | 2018-07-17 | Google Technology Holdings LLC | Interference mitigation in an accessory for a wireless communication device |
WO2013108320A1 (ja) * | 2012-01-16 | 2013-07-25 | 日本電気株式会社 | ページングエリア制御装置及び方法、転送装置、移動通信システム、移動局、並びにコンピュータ可読媒体 |
EP3051736B1 (en) * | 2015-01-30 | 2020-04-29 | Panasonic Intellectual Property Corporation of America | Prioritization in the logical channel prioritization procedure for sidelink logical channels in ProSe direct communications |
US20180042052A1 (en) * | 2015-02-17 | 2018-02-08 | Nokia Solutions And Networks Oy | Communication efficiency |
CN113890719B (zh) * | 2017-01-22 | 2024-10-15 | 上海朗帛通信技术有限公司 | 一种无线通信中的方法和装置 |
CN108811105B (zh) * | 2017-05-04 | 2023-10-13 | 华为技术有限公司 | 一种资源指示方法及装置 |
CN109548146B (zh) * | 2017-08-02 | 2023-10-27 | 阿里巴巴集团控股有限公司 | 通讯方法及装置 |
CN109526059A (zh) * | 2017-08-30 | 2019-03-26 | 鸿海精密工业股份有限公司 | 资源分配方法及相关装置 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0349239B2 (ja) * | 1982-10-22 | 1991-07-26 | Matsushita Electric Ind Co Ltd | |
JP2000236339A (ja) * | 1999-02-16 | 2000-08-29 | Atr Adaptive Communications Res Lab | 無線ネットワークのためのチャネル割り当て装置 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4481316B2 (ja) * | 2007-01-09 | 2010-06-16 | 株式会社エヌ・ティ・ティ・ドコモ | ユーザ装置および送信方法 |
US8004977B2 (en) * | 2007-11-28 | 2011-08-23 | Alcatel Lucent | Method of implementing packet-based resource allocation and persistent resource allocation in a wireless communication system |
-
2009
- 2009-05-01 JP JP2010510177A patent/JP5342550B2/ja not_active Expired - Fee Related
- 2009-05-01 BR BRPI0912185A patent/BRPI0912185A2/pt not_active IP Right Cessation
- 2009-05-01 US US12/990,753 patent/US20110117947A1/en not_active Abandoned
- 2009-05-01 CN CN2009801158081A patent/CN102017755A/zh active Pending
- 2009-05-01 WO PCT/JP2009/058587 patent/WO2009133953A1/ja active Application Filing
- 2009-05-01 EP EP09738890A patent/EP2278844A1/en not_active Withdrawn
- 2009-05-01 KR KR1020107024832A patent/KR20110009131A/ko not_active Application Discontinuation
-
2013
- 2013-05-06 RU RU2013120139/07A patent/RU2013120139A/ru not_active Application Discontinuation
- 2013-05-06 RU RU2013120138/07A patent/RU2013120138A/ru not_active Application Discontinuation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0349239B2 (ja) * | 1982-10-22 | 1991-07-26 | Matsushita Electric Ind Co Ltd | |
JP2000236339A (ja) * | 1999-02-16 | 2000-08-29 | Atr Adaptive Communications Res Lab | 無線ネットワークのためのチャネル割り当て装置 |
Non-Patent Citations (4)
Title |
---|
"Wireless Communications, Networking and Mobile Computing, 2007. WiCom 2007. International Conference on, 2007.10.08", article DAJIE JIANG ET AL.: "Principle and Performance of Semi- persistent Scheduling for VoIP in LTE System", pages: 2861 - 2864, XP031261882 * |
3GPP TS 36.300 V8.4.0, March 2008 (2008-03-01), pages 23 - 25, XP008145188 * |
NTT DOCOMO, INC.: "UL ACK/NACK resource allocation for DL semi-persistent scheduling", 3GPP TSG RAN WG2 #61BIS R2-081857, 31 March 2008 (2008-03-31), XP008145287 * |
QUALCOMM EUROPE: "Semi-persistent scheduling", 3GPP TSG-RAN WG2 #60, R2-075166, 5 November 2007 (2007-11-05), XP008145194 * |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9992005B2 (en) | 2009-12-03 | 2018-06-05 | Huawei Technologies Co., Ltd. | Method, base station, and user equipment for feeding back ACK/NACK information for carrier aggregation |
US10673594B2 (en) | 2009-12-03 | 2020-06-02 | Huawei Technologies Co., Ltd. | Method, base station, and user equipment for feeding back ACK/NACK information for carrier aggregation |
US11848890B2 (en) | 2009-12-03 | 2023-12-19 | Huawei Technologies Co., Ltd. | Method, base station, and user equipment for feeding back ACK/NACK information for carrier aggregation |
JP2012109954A (ja) * | 2010-11-15 | 2012-06-07 | Ntt Docomo Inc | 物理層シグナリングの伝送方法およびその装置 |
WO2013035467A1 (ja) * | 2011-09-09 | 2013-03-14 | 株式会社エヌ・ティ・ティ・ドコモ | 基地局及び通信制御方法 |
JP2013059001A (ja) * | 2011-09-09 | 2013-03-28 | Ntt Docomo Inc | 基地局及び通信制御方法 |
CN110583061A (zh) * | 2017-03-02 | 2019-12-17 | 株式会社Ntt都科摩 | 用户终端及无线通信方法 |
CN110583061B (zh) * | 2017-03-02 | 2023-09-26 | 株式会社Ntt都科摩 | 用户终端及无线通信方法 |
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JP5342550B2 (ja) | 2013-11-13 |
CN102017755A (zh) | 2011-04-13 |
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