WO2015093556A1 - 測定制御方法 - Google Patents
測定制御方法 Download PDFInfo
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- WO2015093556A1 WO2015093556A1 PCT/JP2014/083512 JP2014083512W WO2015093556A1 WO 2015093556 A1 WO2015093556 A1 WO 2015093556A1 JP 2014083512 W JP2014083512 W JP 2014083512W WO 2015093556 A1 WO2015093556 A1 WO 2015093556A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/08—Testing, supervising or monitoring using real traffic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0852—Delays
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/18—Network planning tools
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/0278—Traffic management, e.g. flow control or congestion control using buffer status reports
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
- H04W4/025—Services making use of location information using location based information parameters
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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
- H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
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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
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
- H04W64/006—Locating users or terminals or network equipment for network management purposes, e.g. mobility management with additional information processing, e.g. for direction or speed determination
Definitions
- the present invention relates to a measurement control method used in a mobile communication system.
- the radio environment related to the base station changes.
- a drive test in which a measurement vehicle equipped with measurement equipment is used by an operator to measure a wireless environment and position information and collect a measurement log is performed.
- the wireless environment refers to received power (RSRP: Reference Signal Received Power) of a reference signal received from the base station.
- RSRP or the like collected by MDT is an index indicating the communication quality in the physical layer, and does not directly indicate the communication quality in the upper layer, that is, QoS (Quality of Service). Even if the communication quality in the physical layer is high, the user's request cannot be satisfied if the QoS is low.
- QoS Quality of Service
- the packet delay (latency) in QoS is a quality index that is easy for the user to experience, it is desired that the packet delay can be evaluated.
- an object of the present invention is to provide a measurement control method capable of collecting delay measurement information by MDT.
- the measurement control method is a method for measuring a delay of a downlink packet transmitted from a network to a user terminal in a mobile communication system.
- the measurement control method corresponds to the downlink packet from the step of receiving position information indicating the geographical position of the user terminal from the user terminal in the network and a first time point when the downlink packet is generated. Measuring a downlink packet delay indicating a period until a second time point when a delivery confirmation is received from the user terminal; and associating the downlink packet delay with the position information, thereby allowing the downlink packet delay and the position information to be Generating delay measurement information including.
- the measurement control method is a method for measuring a delay of an uplink packet transmitted from a user terminal to a network in a mobile communication system.
- the second time point is a time point at which a delivery confirmation is transmitted to the user terminal in response to the amount of data received from the user terminal reaching the data amount indicated by the buffer status report.
- the measurement control method is a method for measuring a delay of an uplink packet transmitted from a user terminal to a network in a mobile communication system.
- an uplink indicating a period from a first time after a timing when the uplink packet is generated to a second time when a delivery confirmation corresponding to the uplink packet is received from the network.
- the measurement control method is a method for measuring a delay of a downlink packet transmitted from a network to a user terminal in a mobile communication system.
- the measurement control method corresponds to the downlink packet from the step of receiving position information indicating the geographical position of the user terminal from the user terminal in the network and a first time point when the downlink packet is generated.
- the measurement control method further includes a step of acquiring time information related to the measurement timing of the downlink packet delay in the network.
- the delay measurement information further includes the time information.
- the measurement control method is a method for measuring a delay of an uplink packet transmitted from a user terminal to a network in a mobile communication system.
- the second time point is a time point at which a delivery confirmation is transmitted to the user terminal in response to the amount of data received from the user terminal reaching the data amount indicated by the buffer status report.
- the measurement control method includes: receiving, from the user terminal, location information indicating a geographical location of the user terminal in the network; and associating the uplink packet delay with the location information. Generating delay measurement information including the uplink packet delay and the position information.
- the measurement control method further includes a step of acquiring time information related to the measurement timing of the uplink packet delay in the network.
- the delay measurement information further includes the time information.
- the measurement control method includes: transmitting, to the user terminal, configuration information for configuring an MDT that measures the uplink packet delay in the network; and Transmitting a special buffer status report for the MDT as the buffer status report based on the configuration information.
- the special buffer status report includes information indicating the data amount of a new uplink packet having a lower priority than the existing data in the buffer.
- the measurement control method includes the step of managing the amount of data stored in the buffer according to priority in the user terminal, and the new uplink compared to the existing data in the buffer. Transmitting the special buffer status report including information indicating the data amount of the new uplink packet to the network even when the priority of the packet is low.
- the measurement control method is a method for measuring a delay of an uplink packet transmitted from a user terminal to a network in a mobile communication system.
- an uplink indicating a period from a first time after a timing when the uplink packet is generated to a second time when a delivery confirmation corresponding to the uplink packet is received from the network.
- the first time point is a time point at which the uplink packet is generated or a time point at which the buffer status report reflecting the generated uplink packet is transmitted to the network.
- the measuring step includes a step of measuring a transmission delay indicating a period from the generation time point to the transmission time point.
- the generating step includes the step of including the transmission delay in the delay measurement information.
- the measurement control method further includes a step of acquiring position information indicating a geographical position of the user terminal in the user terminal.
- the generating step includes generating delay measurement information including the uplink packet delay and the position information by associating the uplink packet delay with the position information.
- the measurement control method further includes a step of acquiring time information regarding the measurement timing of the uplink packet delay in the user terminal.
- the delay measurement information further includes the time information.
- the measurement control method further includes a step of transmitting, to the user terminal, configuration information for configuring an MDT that measures the uplink packet delay in the network.
- the configuration information includes information specifying a measurement period in which the uplink packet delay should be measured.
- the measuring step includes the step of measuring the uplink packet delay in the measurement period.
- the step of transmitting comprises the step of transmitting the delay measurement information to the network after the end of the measurement period.
- the measurement control method includes a step of transmitting, to the network, a notification for transmitting the delay measurement information when the user terminal is in a connected state at the end of the measurement period. Is further provided.
- the delay measurement information is transmitted when transitioning from the idle state to the connected state.
- the method further includes the step of transmitting a notification for transmission to the network.
- FIG. 1 is a configuration diagram of an LTE system according to the first embodiment.
- the LTE system according to the first embodiment includes a UE (User Equipment) 100, an E-UTRAN (Evolved-UMTS Terrestrial Radio Access Network) 10, and an EPC (Evolved Packet Core) 20.
- UE User Equipment
- E-UTRAN Evolved-UMTS Terrestrial Radio Access Network
- EPC Evolved Packet Core
- the UE 100 corresponds to a user terminal.
- the UE 100 is a mobile communication device, and performs radio communication with a cell (serving cell).
- the configuration of the UE 100 will be described later.
- the E-UTRAN 10 corresponds to a radio access network.
- the E-UTRAN 10 includes an eNB 200 (evolved Node-B).
- the eNB 200 corresponds to a base station.
- the eNB 200 is connected to each other via the X2 interface. The configuration of the eNB 200 will be described later.
- the eNB 200 manages one or a plurality of cells and performs radio communication with the UE 100 that has established a connection with the own cell.
- the eNB 200 has a radio resource management (RRM) function, a user data routing function, a measurement control function for mobility control / scheduling, and the like.
- RRM radio resource management
- Cell is used as a term indicating a minimum unit of a radio communication area, and is also used as a term indicating a function of performing radio communication with the UE 100.
- the EPC 20 corresponds to a core network.
- the LTE system network is configured by the E-UTRAN 10 and the EPC 20.
- the EPC 20 includes an MME (Mobility Management Entity) / S-GW (Serving-Gateway) 300.
- the MME performs various mobility controls for the UE 100.
- the SGW performs user data transfer control.
- the MME / S-GW 300 is connected to the eNB 200 via the S1 interface.
- FIG. 2 is a block diagram of the UE 100.
- the UE 100 includes a plurality of antennas 101, a radio transceiver 110, a user interface 120, a GNSS (Global Navigation Satellite System) receiver 130, a battery 140, a memory 150, and a processor 160.
- the memory 150 corresponds to a storage unit.
- the processor 160 (and the memory 150) constitutes a control unit.
- the UE 100 may not have the GNSS receiver 130.
- the memory 150 may be integrated with the processor 160, and this set (that is, a chip set) may be used as the processor 160 '.
- the plurality of antennas 101 and the wireless transceiver 110 are used for transmitting and receiving wireless signals.
- the radio transceiver 110 converts the baseband signal (transmission signal) output from the processor 160 into a radio signal and transmits it from the plurality of antennas 101. Further, the radio transceiver 110 converts radio signals received by the plurality of antennas 101 into baseband signals (received signals) and outputs the baseband signals to the processor 160.
- the user interface 120 is an interface with a user who owns the UE 100, and includes, for example, a display, a microphone, a speaker, and various buttons.
- the user interface 120 receives an operation from the user and outputs a signal indicating the content of the operation to the processor 160.
- the GNSS receiver 130 receives a GNSS signal and outputs the received signal to the processor 160 in order to obtain position information (longitude, latitude, etc.) indicating the geographical position of the UE 100.
- the battery 140 stores power to be supplied to each block of the UE 100.
- the memory 150 stores a program executed by the processor 160 and information used for processing by the processor 160.
- the processor 160 includes a baseband processor that modulates / demodulates and encodes / decodes a baseband signal, and a CPU (Central Processing Unit) that executes programs stored in the memory 150 and performs various processes. .
- the processor 160 may further include a codec that performs encoding / decoding of an audio / video signal.
- the processor 160 executes various processes and various communication protocols described later.
- FIG. 3 is a block diagram of the eNB 200.
- the eNB 200 includes a plurality of antennas 201, a radio transceiver 210, a network interface 220, a memory 230, and a processor 240.
- the memory 230 corresponds to a storage unit.
- the processor 240 (and the memory 230) constitutes a control unit.
- the plurality of antennas 201 and the wireless transceiver 210 are used for transmitting and receiving wireless signals.
- the radio transceiver 210 converts a baseband signal (transmission signal) output from the processor 240 into a radio signal and transmits the radio signal from the plurality of antennas 201.
- the radio transceiver 210 converts radio signals received by the plurality of antennas 201 into baseband signals (reception signals) and outputs the baseband signals to the processor 240.
- the network interface 220 is connected to the neighboring eNB 200 via the X2 interface and is connected to the MME / S-GW 300 via the S1 interface.
- the network interface 220 is used for communication performed on the X2 interface and communication performed on the S1 interface.
- the memory 230 stores a program executed by the processor 240 and information used for processing by the processor 240.
- the processor 240 includes a baseband processor that performs modulation / demodulation and encoding / decoding of a baseband signal, and a CPU that executes a program stored in the memory 230 and performs various processes.
- the processor 240 executes various processes and various communication protocols described later.
- FIG. 4 is a protocol stack diagram of a radio interface in the LTE system. As shown in FIG. 4, the radio interface protocol is divided into the first to third layers of the OSI reference model, and the first layer is a physical (PHY) layer.
- the second layer includes a MAC (Medium Access Control) layer, an RLC (Radio Link Control) layer, and a PDCP (Packet Data Convergence Protocol) layer.
- the third layer includes an RRC (Radio Resource Control) layer.
- the physical layer performs encoding / decoding, modulation / demodulation, antenna mapping / demapping, and resource mapping / demapping. Between the physical layer of UE100 and the physical layer of eNB200, user data and a control signal are transmitted via a physical channel.
- the MAC layer performs data priority control, retransmission processing by hybrid ARQ (HARQ), and the like. Between the MAC layer of the UE 100 and the MAC layer of the eNB 200, user data and control signals are transmitted via a transport channel.
- the MAC layer of the eNB 200 includes a scheduler that determines an uplink / downlink transport format (transport block size, modulation / coding scheme) and an allocation resource block to the UE 100.
- the RLC layer transmits data to the RLC layer on the receiving side using the functions of the MAC layer and the physical layer. Between the RLC layer of the UE 100 and the RLC layer of the eNB 200, user data and control signals are transmitted via a logical channel.
- the PDCP layer performs header compression / decompression and encryption / decryption.
- the RRC layer is defined only in the control plane that handles control signals. Control signals (RRC messages) for various settings are transmitted between the RRC layer of the UE 100 and the RRC layer of the eNB 200.
- the RRC layer controls the logical channel, the transport channel, and the physical channel according to establishment, re-establishment, and release of the radio bearer.
- RRC connection When there is a connection (RRC connection) between the RRC of the UE 100 and the RRC of the eNB 200, the UE 100 is in a connected state (RRC connected state), and otherwise, the UE 100 is in an idle state (RRC idle state).
- the NAS (Non-Access Stratum) layer located above the RRC layer performs session management and mobility management.
- FIG. 5 is a configuration diagram of a radio frame used in the LTE system.
- OFDMA Orthogonal Frequency Division Multiple Access
- SC-FDMA Single Carrier Division Multiple Access
- the radio frame is composed of 10 subframes arranged in the time direction.
- Each subframe is composed of two slots arranged in the time direction.
- the length of each subframe is 1 ms, and the length of each slot is 0.5 ms.
- Each subframe includes a plurality of resource blocks (RB) in the frequency direction and includes a plurality of symbols in the time direction.
- Each resource block includes a plurality of subcarriers in the frequency direction.
- One subcarrier and one symbol constitute a resource element (RE).
- the frequency resource is composed of RBs
- the time resource is composed of subframes (or slots).
- the section of the first few symbols of each subframe is an area mainly used as a physical downlink control channel (PDCCH) and a physical HARQ indicator channel (PHICH) for transmitting control signals.
- the remaining part of each subframe is an area that can be used mainly as a physical downlink shared channel (PDSCH) for transmitting user data.
- downlink reference signals such as cell specific reference signals (CRS) are distributed and arranged.
- the control signal transmitted by the PDCCH includes, for example, uplink SI (Scheduling Information), downlink SI, and TPC bits.
- the uplink SI is scheduling information related to the allocation of uplink radio resources, and is also referred to as UL grant.
- the downlink SI is scheduling information related to allocation of downlink radio resources.
- the TPC bit is information instructing increase / decrease in uplink transmission power. These pieces of information are referred to as downlink control information (DCI).
- DCI downlink control information
- the control signal transmitted by PHICH is ACK / NACK.
- ACK / NACK is information indicating whether or not decoding of user data transmitted via an uplink physical channel (for example, PUSCH) has succeeded.
- the PDSCH carries control signals and / or user data. For example, the downlink data area may be allocated only to user data, or may be allocated such that user data and control signals are multiplexed.
- both ends in the frequency direction in each subframe are regions used mainly as a physical uplink control channel (PUCCH) for transmitting a control signal.
- the remaining part of each subframe is an area that can be used mainly as a physical uplink shared channel (PUSCH) for transmitting user data.
- an uplink reference signal such as a sounding reference signal (SRS) is arranged in a predetermined symbol of each subframe.
- the control signals transmitted by PUCCH include, for example, CQI (Channel Quality Indicator), PMI (Precoding Matrix Indicator), RI (Rank Indicator), SR (Scheduling Request), and ACK / NACK.
- CQI is an index indicating downlink channel quality, and is used for determining a recommended modulation scheme and coding rate to be used for downlink transmission.
- PMI is an index indicating a precoder matrix that is preferably used for downlink transmission.
- RI is an index indicating the number of layers (number of streams) that can be used for downlink transmission.
- SR is information for requesting allocation of uplink radio resources (resource blocks).
- ACK / NACK is information indicating whether or not decoding of user data transmitted via a downlink physical channel (for example, PDSCH) has succeeded.
- the PUSCH carries control signals and / or user data.
- the uplink data area may be allocated only to user data, or may be allocated such that user data and control signals are multiplexed.
- the LTE system supports MDT that uses the UE 100 to automate measurement and collection.
- RSRP collected by MDT is an index indicating communication quality in the physical layer, and is communication quality in higher layers (MAC layer, PLC layer, and PDCP layer), that is, QoS (Quality). of Service) is not directly indicated. Even if the communication quality in the physical layer is high, the user's request cannot be satisfied if the QoS is low.
- packet delay (latency) in QoS is a quality index that a user can easily experience, so it is desirable to be able to evaluate packet delay.
- the measurement control method is a method for measuring a delay of a downlink packet transmitted from the eNB 200 to the UE 100 in the LTE system.
- the downlink packet is a packet (layer 2 packet) that is transmitted via a data radio bearer (DRB) and is handled in the MAC layer / PLC layer / PDCP layer corresponding to the second layer of the OSI reference model.
- DRB data radio bearer
- the first embodiment exemplifies a case where the downlink packet is a PDCP SDU (Service Data Unit) that has reached the PDCP layer from above the PDCP layer.
- PDCP SDU Service Data Unit
- the eNB 200 receives a location information indicating the geographical location of the UE 100 from the UE 100 and a delivery corresponding to the downlink packet from the first time point when the downlink packet is generated.
- a step of measuring a downlink packet delay (hereinafter referred to as “downlink latency”) indicating a period until the second time point when the confirmation (HARQ ACK) is received from the UE 100, and associating the downlink latency with the location information, Generating delay measurement information including link latency and position information.
- the eNB 200 calculates the downlink latency (i) for the i-th downlink PDCP SDU that has reached the PDCP layer by using, for example, the following equation (1).
- tArriv (i) indicates the time point (first time point) when the i-th downlink PDCP SDU arrives at the eNB 200.
- the TAck (i) indicates the time point (second time point) at which the last HARQ ACK corresponding to the i-th downlink PDCP SDU is received from the UE 100 in the eNB 200.
- the downlink PDCP SDU is divided in the RLC layer of the eNB 200 and combined in the RLC layer of the UE 100. Therefore, the last HARQ ACK corresponding to the PDCP SDU means the last HARQ ACK among a plurality of HARQ ACKs corresponding to each divided data unit (specifically, MAC PDU).
- the measurement control method includes a step of acquiring time information (time stamp) regarding the measurement timing of the downlink latency in the eNB 200.
- the time information is, for example, network absolute time.
- the eNB 200 includes time information in the delay measurement information.
- the eNB 200 measures the downlink latency for each PDCP SDU and exemplifies a case in which delay measurement information is generated by associating each of the downlink latencies measured for each PDCP SDU with position information and time information. .
- the eNB 200 measures the average downlink latency for a plurality of PDCP SDUs every predetermined number or every predetermined period, and measures delay by associating each of the average downlink latencies with position information and time information. Information may be generated.
- the eNB 200 measures the average downlink latency for each PDCP SDU group having the same QCI (QoS Class Identifier), and associates each of the average downlink latencies with the position information and the time information, thereby measuring the delay measurement information. May be generated.
- QCI QoS Class Identifier
- FIG. 6 is a sequence diagram showing an operation sequence according to the first embodiment.
- the UE 100 is in a state (connected state) in which an RRC connection with the eNB 200 is established, and user data is transmitted and received in the downlink.
- the eNB 200 starts MDT measurement of downlink latency.
- the eNB 200 transmits configuration information for configuring the Immediate MDT to the UE 100.
- Configuration information is transmitted and received in the RRC layer.
- the configuration information is “includeLocationInfo” that requests to include location information in a measurement report (Meas. Report) for mobility control.
- the UE 100 that has received the configuration information includes its own location information in the measurement report.
- the measurement report includes the respective RSRP and / or RSRQ of the serving cell and neighboring cells.
- step S102 the UE 100 transmits a measurement report including its own location information “Location 1” to the eNB 200.
- the eNB 200 that has received the measurement report including the location information “Location1” stores the location information “Location1”.
- step S103 the eNB 200 measures the downlink latency 1 for the PDCP SDU1 according to the equation (1).
- the eNB 200 generates the delay measurement information “Latency result 1” by associating the measured downlink latency 1 with the recently received position information “Location 1” and the time information “Time 1” related to the measurement time, and generates the generated delay measurement.
- the information “Latency result 1” is stored.
- Step S104 the UE 100 transmits a measurement report including its own location information “Location 2” to the eNB 200.
- the eNB 200 that has received the measurement report including the location information “Location2” stores the location information “Location2”.
- step S105 the eNB 200 measures the downlink latency 2 for the PDCP SDU2 according to the equation (1).
- the eNB 200 generates the delay measurement information “Latency result 2” by associating the measured downlink latency 2 with the recently received position information “Location 2” and the time information “Time 2” related to the measurement time, and generates the generated delay measurement.
- the information “Latency result 2” is stored.
- step S106 the eNB 200 measures the downlink latency 3 for the PDCP SDU 3 according to the equation (1).
- the eNB 200 generates the delay measurement information “Latency result 3” by associating the measured downlink latency 3 with the recently received position information “Location 2” and the time information “Time 3” related to the measurement time, and generates the generated delay Measurement information “Latency result 3” is stored.
- step S107 the same procedure as the measurement collection procedure described above is repeated until the MDT measurement period “T” ends.
- Table 1 shows an example of delay measurement information collected by the eNB 200 during the MDT measurement period “T”.
- the eNB 200 notifies the EPC 20 of delay measurement information as shown in Table 1. Thereby, the EPC 20 (that is, the operator) performs network optimization for improving the downlink latency by evaluating the downlink latency for each position. Alternatively, the eNB 200 may use delay measurement information as shown in Table 1 for optimizing its own parameters instead of transmitting it to the EPC 20.
- the eNB 200 receives the position information indicating the geographical position of the UE 100 from the UE 100, and the downlink from the first time point when the downlink packet is generated.
- HARQ ACK acknowledgment
- downlink latency delay measurement information can be collected by MDT.
- the measurement control method according to the second embodiment is a method for measuring a delay of an uplink packet transmitted from the UE 100 to the eNB 200 in the LTE system.
- the uplink packet is a packet (layer 2 packet) that is transmitted via a data radio bearer (DRB) and is handled by the MAC layer / PLC layer / PDCP layer corresponding to the second layer of the OSI reference model.
- DRB data radio bearer
- the second embodiment exemplifies a case where the uplink packet is a PDCP SDU that has reached the PDCP layer from above the PDCP layer.
- the second time point is a time point at which a delivery confirmation (HARQ ACK) is transmitted to the UE 100 in response to the amount of data received from the UE 100 reaching the data amount indicated by the BSR.
- BSR buffer status report
- the eNB 200 calculates the uplink latency (i) for the i-th uplink PDCP SDU that has reached the PDCP layer of the UE 100 using, for example, the following equation (2).
- tArriv (i) indicates a time point (first time point) when the eNB 200 receives a BSR corresponding to the i-th uplink PDCP SDU newly generated in the UE 100.
- the TAck (i) indicates a time point (second time point) at which the last HARQ ACK corresponding to the i-th uplink PDCP SDU is transmitted to the UE 100 in the eNB 200.
- the uplink PDCP SDU is divided in the RLC layer of the UE 100 and combined in the RLC layer of the eNB 200. Therefore, the last HARQ ACK corresponding to the PDCP SDU means the last HARQ ACK among a plurality of HARQ ACKs corresponding to the divided MAC PDUs.
- the eNB 200 monitors the amount of data received from the UE 100, and the last HARQ ACK corresponding to the PDCP SDU is the HARQ ACK for the MAC PDU received when the data amount indicated by the BSR is reached. It is.
- the measurement control method includes a step of receiving position information indicating the geographical position of the UE 100 from the UE 100 in the eNB 200 and associating the uplink latency with the position information, thereby including the uplink latency and the position information. Generating delay measurement information.
- the measurement control method includes a step of acquiring time information (time stamp) related to uplink latency measurement timing in the eNB 200.
- the time information is, for example, network absolute time.
- the eNB 200 includes time information in the delay measurement information.
- the second embodiment exemplifies a case where the eNB 200 measures the uplink latency for each PDCP SDU and generates delay measurement information by associating each of the uplink latencies measured for each PDCP SDU with position information and time information. .
- the eNB 200 measures the average uplink latency for a plurality of PDCP SDUs for each predetermined number or every predetermined period, and measures the delay by associating each of the average uplink latencies with position information and time information. Information may be generated.
- the eNB 200 may generate delay measurement information by measuring an average uplink latency for each PDCP SDU group having the same QCI and associating each of the average uplink latencies with position information and time information. Good.
- FIG. 7 is a sequence diagram showing an operation sequence according to the second embodiment.
- the UE 100 is in a state (connected state) in which an RRC connection with the eNB 200 is established, and user data is transmitted and received in the uplink.
- the eNB 200 starts uplink latency MDT measurement.
- the eNB 200 transmits configuration information for configuring the Immediate MDT to the UE 100.
- Configuration information is transmitted and received in the RRC layer.
- the configuration information is “includeLocationInfo” that requests to include location information in a measurement report (Meas. Report) for mobility control.
- the UE 100 that has received the configuration information includes its own location information in the measurement report.
- illustration of a measurement report transmitted from the UE 100 to the eNB 200 is omitted, but actually, the UE 100 transmits a measurement report including its own location information to the eNB 200.
- step S201 PDCP SDU1 reaches the PDCP layer of UE100. That is, in the UE 100, PDCP SDU1 to be transmitted to the eNB 200 is generated.
- step S202 the UE 100 transmits a BSR indicating the data amount of the generated PDCP SDU 1 to the eNB 200.
- BSR is transmitted and received in the MAC layer.
- the eNB 200 starts the timer 1 at the reception time “tArriv (1)” of the BSR.
- step S203 the eNB 200 that has received the BSR transmits, to the UE 100, a UL grant for assigning an uplink radio resource to the UE 100 based on the BSR.
- step S204 the UE 100 that has received the UL grant transmits each MAC PDU corresponding to the PDCP SDU1 to the eNB 200 on the PUSCH based on the UL grant.
- step S205 the eNB 200 that has received each MAC PDU corresponding to the PDCP SDU1 reconstructs the PDCP SDU1 by connecting the MAC PDUs.
- step S206 PDCP SDU2 reaches the PDCP layer of UE100. That is, in the UE 100, PDCP SDU2 to be transmitted to the eNB 200 is generated.
- step S207 the UE 100 transmits a BSR indicating the data amount of the generated PDCP SDU2 to the eNB 200.
- the eNB 200 starts the timer 2 at the reception time “tArriv (2)” of the BSR.
- step S208 the eNB 200 that has received the BSR transmits, to the UE 100, a UL grant for assigning an uplink radio resource to the UE 100 based on the BSR. Moreover, eNB200 transmits HARQ ACK with respect to the last MAC PDU received by step S204 to UE100. The eNB 200 stops the timer 1 at the transmission time “tAck (1)” of the HARQ ACK, and measures the uplink latency 1 from the timer 1.
- the eNB 200 generates the delay measurement information “Latency result 1” by associating the measured uplink latency 1 with the most recently received position information “Location 1” and time information “Time 1” related to the measurement time, and generates the generated delay Measurement information “Latency result 1” is stored.
- step S209 eNB200 transmits UL grant for allocating an uplink radio resource to UE100 to UE100 based on BSR received from UE100 in step S207.
- step S210 the UE 100 transmits a part of MAC PDUs corresponding to PDCP SDU2 to the eNB 200 on the PUSCH based on the UL grant received from the eNB 200 in step S208.
- step S211 the UE 100 transmits the remaining MAC PDU corresponding to PDCP SDU2 to the eNB 200 on the PUSCH based on the UL grant received from the eNB 200 in step S209.
- step S212 the eNB 200 that has received each MAC PDU corresponding to the PDCP SDU 2 reconstructs the PDCP SDU 2 by connecting the MAC PDUs.
- step S213 the eNB 200 transmits the HARQ ACK for the MAC PDU received from the UE 100 in step S210 to the UE 100.
- step S214 the eNB 200 transmits the HARQ ACK for the MAC PDU received from the UE 100 in step S211 (that is, the last HARQ ACK corresponding to the PDCP SDU2) to the UE 100.
- the eNB 200 stops the timer 2 at the transmission time “tAck (2)” of the HARQ ACK, and measures the uplink latency 2 from the timer 2.
- the eNB 200 generates the delay measurement information “Latency result 2” by associating the measured uplink latency 2 with the recently received position information “Location 2” and the time information “Time 2” related to the measurement time, and generates the generated delay
- the measurement information “Latency result 2” is stored.
- the eNB 200 notifies the EPC 20 of the collected delay measurement information. Accordingly, the EPC 20 (that is, the operator) performs network optimization for improving the uplink latency by evaluating the uplink latency for each position. Alternatively, the eNB 200 may use the collected delay measurement information for its own parameter optimization instead of transmitting it to the EPC 20.
- the eNB 200 receives the BSR indicating the amount of uplink packet data accumulated in the buffer of the UE 100 from the UE 100, and the first receiving the BSR.
- the uplink latency indicating the period from the time point until the second time point when the acknowledgment amount (HARQ ACK) is transmitted to the UE 100 in response to the amount of data received from the UE 100 reaching the data amount indicated by the BSR is measured. Steps. Thereby, the delay measurement information of the uplink latency can be collected by MDT.
- uplink latency is measured using BSR.
- the UE 100 manages the amount of data stored in the uplink buffer for each priority (for each QCI).
- the BSR is triggered.
- the BSR is not triggered. Therefore, it is difficult to apply the measurement control method according to the second embodiment to the case where the latency of the low priority uplink packet is measured.
- FIG. 8 is a sequence diagram showing an operation when a low-priority uplink packet is generated in the measurement control method according to the second embodiment.
- differences from the above-described second embodiment will be mainly described.
- step S252 the UE 100 transmits a BSR indicating the data amount of the generated PDCP SDU 1 to the eNB 200.
- the eNB 200 starts the timer 1 at the reception time “tArriv (1)” of the BSR.
- Steps S253 to S256 the eNB 200 that has received the BSR transmits, to the UE 100, UL grant for allocating an uplink radio resource to the UE 100 based on the BSR.
- the UE 100 that has received the UL grant transmits each MAC PDU corresponding to the PDCP SDU1 to the eNB 200 on the PUSCH based on the UL grant.
- the UE 100 transmits a BSR indicating the data amount of the PDCP SDU 2 to the eNB 200 in response to the completion of the transmission of the PDCP SDU 1.
- the eNB 200 starts the timer 2 at the reception time “tArriv (2)” of the BSR.
- a transmission delay of the BSR occurs between the timing when the PDCP SDU2 is generated (step S257) and the timing when the BSR indicating the data amount of the PDCP SDU2 is transmitted to the eNB 200 (step S261). Since the eNB 200 cannot grasp the transmission delay and starts the timer at a timing (step S261) that is not the timing at which the PDCP SDU2 is generated, the uplink latency measured for the PDCP SDU2 is an inaccurate value. End up.
- the eNB 200 transmits the configuration information for configuring the MDT for measuring the uplink latency to the UE 100, and the UE 100 based on the configuration information in the MDT. Transmitting a special BSR (hereinafter referred to as “BDT for MDT”).
- BDT for MDT is basically used only for MDT, and it is not preferable to use it for scheduling.
- the MDT BSR includes information indicating the data amount of a new uplink packet having a lower priority than the existing data in the uplink buffer of the UE 100. Details of the MDT BSR will be described later.
- the measurement control method according to the modified example of the second embodiment is the same for the new uplink packet even when the priority of the new uplink packet is lower than the existing data in the uplink buffer of the UE 100.
- FIG. 9 is a flowchart showing the operation of the UE 100 according to the modified example of the second embodiment. This flow is executed at every transmission time interval (TTI) in the MAC layer of the UE 100.
- TTI transmission time interval
- step S2001 the UE 100 determines whether there is existing data (that is, data that can be used for transmission) in the uplink buffer.
- step S2002 the UE 100 determines whether new data has been generated in the current TTI.
- step S2002; YES the UE 100 triggers a normal BSR. If no new data is generated in the current TTI (step S2002; NO), there is no data available for transmission, so the BSR is not triggered (step S2004).
- step S2005 the UE 100 determines whether or not new data is generated in the current TTI.
- step S2006 the UE 100 determines whether or not the priority of the new data is higher than the priority of the existing data.
- step S2007 the UE 100 triggers a normal BSR.
- step S2008 the UE 100 determines whether or not an MDT for measuring the uplink latency is configured.
- step S2009 the UE 100 triggers the MDT BSR.
- step S2010 the UE 100 determines whether the reTxBSR timer has expired. Determine whether.
- the reTxBSR timer is a timer used to detect that the BSR has not been transmitted for a certain period.
- step S2011 the UE 100 triggers a normal BSR.
- step S2012 the UE 100 determines whether or not the periodicBSR timer has expired.
- the periodic BSR timer is a timer used for detecting the transmission timing of periodic BSR.
- step S2013 the UE 100 triggers a periodic BSR.
- step S2014 the UE 100 determines whether or not there are sufficient padding bits for transmitting the BSR in the current TTI. When there are sufficient padding bits for transmitting the BSR in the current TTI (step S2014; YES), in step S2015, the UE 100 triggers the padding BSR. If there are not enough padding bits to transmit a BSR in this TTI (step S2014; NO), the BSR is not triggered (step S2016).
- a MAC PDU (Protocol Data Unit) mainly includes a MAC header and a MAC payload.
- the MAC header includes a MAC subheader, and the MAC payload includes a MAC control element, a MAC SDU, and padding.
- Each MAC subheader consists of a logical channel ID (LCID) and a length (L) field.
- the LCID indicates whether the corresponding part of the MAC payload is a MAC control element, and if not, indicates the logical channel to which the associated MAC SDU belongs.
- the L field indicates the size of the associated MAC SDU or MAC control element.
- the MAC control element is used for MAC level signaling. In the uplink, the MAC control element is used to provide BSR and report power headroom indicating available power.
- Table 2 shows a configuration example of the MAC header of the MDT BSR (BSR for MDT). Table 2 exemplifies a case where the MDT BSR is indicated by “11000”.
- FIG. 10 is a diagram illustrating a configuration example of a new BSR format for the MDT BSR.
- buffer states of two low-priority logical channel groups (LCG) are shown.
- the MDT BSR may always have the Long BSR format.
- the MDT BSR may be used depending on the situation for effective use of resources. For example, when the number of generated data is one, only the buffer status of low priority data is notified by the format of Short BSR, and when the number of generated data is two or more, the format is notified by the format of Long BSR.
- Table 3 shows a configuration example of the MAC header in this case. Table 2 exemplifies a case where the Short BSR for MDT (Short BSR for MDT) is “10111” and the Long BSR for MDT (Long BSR for MDT) is “11000”.
- the third embodiment is common to the second embodiment in that the uplink latency is measured.
- the measurement entity is the eNB 200, whereas in the third embodiment, the measurement entity is the UE 100. There are some differences.
- the method in which the UE 100 in the idle state performs measurement / collection to store the measurement information and transmits the measurement information to the network later is defined in the existing specification, and is referred to as Logged MDT.
- the connected UE 100 performs measurement and collection, and transmits measurement information to the network.
- Such a technique is sometimes referred to as Logged MDT in Connected.
- the measurement control method according to the third embodiment is a method for measuring a delay of an uplink packet transmitted from the UE 100 to the eNB 200 in the LTE system.
- the uplink packet is a packet (layer 2 packet) that is transmitted via a data radio bearer (DRB) and is handled by the MAC layer / PLC layer / PDCP layer corresponding to the second layer of the OSI reference model.
- DRB data radio bearer
- the second embodiment exemplifies a case where the uplink packet is a PDCP SDU that has reached the PDCP layer from above the PDCP layer.
- the UE 100 in the UE 100, from the first time point after the timing when the uplink packet is generated, to the second time point when the delivery confirmation (HARQ ACK) corresponding to the uplink packet is received from the eNB 200.
- the UE 100 calculates the uplink latency (i) for the i-th uplink PDCP SDU that has reached the PDCP layer, for example, by the following equation (3).
- tArriv (i) indicates a time point (first time point) at which the i-th uplink PDCP SDU arrives in the UE 100. That is, tArriv (i) is the time when an uplink PDCP SDU occurs. Alternatively, tArriv (i) is a transmission time point at which the BSR reflecting the generated uplink PDCP SDU is transmitted to the eNB 200. In this case, the UE 100 may measure a transmission delay (BSR transmission delay) indicating a period from the time of occurrence to the time of transmission, and include the transmission delay in the delay measurement information.
- BSR transmission delay transmission delay
- the TAck (i) indicates a time point (second time point) when the UE 100 receives the last HARQ ACK corresponding to the i-th uplink PDCP SDU from the eNB 200.
- the uplink PDCP SDU is divided in the RLC layer of the UE 100 and combined in the RLC layer of the eNB 200. Therefore, the last HARQ ACK corresponding to the uplink PDCP SDU means the last HARQ ACK among a plurality of HARQ ACKs corresponding to each of the divided MAC PDUs.
- the measurement control method includes a step of acquiring position information indicating a geographical position of the UE 100 in the UE 100.
- the UE 100 generates delay measurement information including the uplink latency and the position information by associating the uplink latency with the position information.
- the measurement control method includes a step of acquiring time information (time stamp) regarding the measurement timing of the uplink latency in the UE 100.
- time information time stamp
- the network absolute time is notified from the eNB 200 to the UE 100 using configuration information described later, and the elapsed time from the network absolute time to the measurement timing is counted in the UE 100.
- a set of the network absolute time and the elapsed time is used as time information.
- the UE 100 includes time information in the delay measurement information.
- the third embodiment exemplifies a case where the UE 100 measures the uplink latency for each PDCP SDU, and generates delay measurement information by associating each of the uplink latencies measured for each PDCP SDU with position information and time information. .
- the UE 100 measures the average uplink latency for a plurality of PDCP SDUs every predetermined number or every predetermined period, and measures the delay by associating each of the average uplink latency with the position information and the time information. Information may be generated.
- the UE 100 may generate delay measurement information by measuring an average uplink latency for each PDCP SDU group having the same QCI and associating each of the average uplink latencies with position information and time information. Good.
- the measurement control method includes a step of transmitting, to the UE 100, configuration information for configuring an MDT that measures uplink latency in the eNB 200.
- the configuration information can be an information element (for example, “latencyMeasure-setup”) included in a LoggedMeasurementConfiguration message that is a message for a Logged MDT configuration defined in the existing specification.
- a new message for Logged MDT in Connected configuration may be specified, and the message may be used as configuration information.
- the configuration information for configuring the MDT for measuring the uplink latency includes information for designating a measurement period (MDT measurement period) in which the uplink latency should be measured.
- UE100 measures an uplink latency in the designated MDT measurement period, and transmits delay measurement information to eNB200 after the end of the measurement period.
- the MDT measurement period ends in the eNB (handover destination eNB) different from the eNB 200 that transmits the configuration information to the UE 100
- the UE 100 performs a handover with respect to the handover destination eNB by performing a handover in the MDT measurement period.
- Measurement information may be transmitted. Therefore, in order to record the eNB / cell in which the measurement has been performed, the identifier of the eNB / cell in which the measurement has been performed may be included in the delay measurement information.
- the measurement control method includes a step of transmitting a notification for transmitting delay measurement information to the eNB 200 when the UE 100 is in a connected state at the end of the measurement period.
- the notification is a message (for example, LoggedMeasurementInCONReportReportRequest message) that requests assignment of radio resources for transmitting delay measurement information.
- the notification may be information indicating that the delay measurement information can be transmitted, and may be an information element included in the RRCConnectionReestablishmentRequest message defined by the existing specification.
- a notification for transmitting delay measurement information is transmitted when the UE 100 transitions from the idle state to the connected state.
- a step of transmitting to the eNB 200 Similar to the Logged MDT, the notification is information indicating that the measurement log can be transmitted, and is an information element (logmeavailable) included in the RRCConnectionSetupComplete message. Further, a new information element (for example, logMeasCONNAavailable) indicating that delay measurement information can be transmitted may be defined in the measurement log.
- the eNB 200 makes a request to the UE 100 for acquiring delay measurement information based on the notification.
- the UE 100 transmits delay measurement information to the eNB 200 in response to the request.
- notification for transmitting delay measurement information when transitioning to the idle state and transitioning from the idle state to the connected state May be transmitted to the eNB 200.
- the UE 100 may discard the stored delay measurement information when a long time (a certain time) has elapsed in the idle state without transmitting the delay measurement information. Specifically, the UE 100 measures the time (holding time) in which the delay measurement information is stored, and stores the delay when the holding time has passed within a certain time without transmitting the delay measurement information. Measurement information can be discarded.
- FIG. 11 is a sequence diagram showing an operation sequence according to the third embodiment.
- the UE 100 is in a state (connected state) in which an RRC connection with the eNB 200 is established, and user data is transmitted and received in the uplink.
- step S300 the UE 100 starts uplink latency MDT measurement according to the configuration information from the eNB 200.
- step S301 PDCP SDU1 reaches the PDCP layer of UE100. That is, in the UE 100, PDCP SDU1 to be transmitted to the eNB 200 is generated. The UE 100 starts a timer at the time “tArriv (1)” when the PDCP SDU1 occurs.
- step S302 the UE 100 transmits a BSR indicating the data amount of the generated PDCP SDU 1 to the eNB 200.
- step S303 the eNB 200 that has received the BSR transmits, to the UE 100, UL grant for assigning an uplink radio resource to the UE 100 based on the BSR.
- step S304 the UE 100 that has received the UL grant transmits each MAC PDU corresponding to the PDCP SDU1 to the eNB 200 on the PUSCH based on the UL grant.
- step S305 the eNB 200 that has received each MAC PDU corresponding to the PDCP SDU1 reconstructs the PDCP SDU1 by concatenating the MAC PDUs.
- step S306 the eNB 200 transmits the HARQ ACK for the last MAC PDU received in step S304 to the UE 100.
- the UE 100 that has received the HARQ ACK stops the timer at the reception time “tAck (1)” of the HARQ ACK, and measures the uplink latency 1 from the timer.
- the UE 100 generates delay measurement information “Latency result 1” by associating the measured uplink latency 1 with its own location information “Location 1” and time information “Time 1” related to the measurement time, and generates the generated delay measurement information “ Latency result 1 "is stored. Thereafter, the same procedure as the measurement collection procedure described above is repeated until the MDT measurement period “T” ends. As a result, delay measurement information as shown in Table 1 is collected by the UE 100.
- step S307 after the end of the MDT measurement period “T”, the UE 100 transmits the stored delay measurement information to the eNB 200.
- the UE 100 has received the delivery confirmation (HARQ ACK) corresponding to the uplink packet from the eNB 200 from the first time point after the timing when the uplink packet is generated. Measuring uplink latency indicating a period until the second time point, generating delay measurement information including the uplink latency, and transmitting the delay measurement information to the eNB 200. Thereby, the delay measurement information of the uplink latency can be collected by MDT.
- HARQ ACK delivery confirmation
- the LTE system is exemplified as the mobile communication system.
- the present invention may be applied not only to the LTE system but also to a system other than the LTE system.
- the present invention is useful in the mobile communication field.
Abstract
Description
第1実施形態に係る測定制御方法は、移動通信システムにおいてネットワークからユーザ端末に送信する下りリンクパケットの遅延を測定するための方法である。前記測定制御方法は、前記ネットワークにおいて、前記ユーザ端末の地理的位置を示す位置情報を前記ユーザ端末から受信するステップと、前記下りリンクパケットが発生した第1時点から、前記下りリンクパケットに対応する送達確認を前記ユーザ端末から受信した第2時点までの期間を示す下りリンクパケット遅延を測定するステップと、前記下りリンクパケット遅延を前記位置情報と関連付けることにより、前記下りリンクパケット遅延及び前記位置情報を含んだ遅延測定情報を生成するステップと、を備える。
以下において、本発明をLTEシステムに適用する場合の実施形態を説明する。
図1は、第1実施形態に係るLTEシステムの構成図である。図1に示すように、第1実施形態に係るLTEシステムは、UE(User Equipment)100、E-UTRAN(Evolved-UMTS Terrestrial Radio Access Network)10、及びEPC(Evolved Packet Core)20を備える。
次に、第1実施形態に係る測定制御方法について説明する。
次に、第1実施形態に係る動作シーケンスについて説明する。図6は、第1実施形態に係る動作シーケンスを示すシーケンス図である。図6の初期状態において、UE100はeNB200とのRRC接続を確立した状態(コネクティッド状態)であり、下りリンクにおいてユーザデータの送受信を行っていると仮定する。
上述したように、第1実施形態に係る測定制御方法は、eNB200において、UE100の地理的位置を示す位置情報をUE100から受信するステップと、下りリンクパケットが発生した第1時点から、当該下りリンクパケットに対応する送達確認(HARQ ACK)をUE100から受信した第2時点までの期間を示す下りリンクレイテンシを測定するステップと、下りリンクレイテンシを位置情報と関連付けることにより、下りリンクレイテンシ及び位置情報を含んだ遅延測定情報を生成するステップと、を備える。これにより、下りリンクレイテンシの遅延測定情報をMDTにより収集可能とすることができる。
以下において、第2実施形態について、第1実施形態との相違点を主として説明する。第2実施形態は、システム構成については第1実施形態と同様である。
第2実施形態に係る測定制御方法は、LTEシステムにおいてUE100からeNB200に送信する上りリンクパケットの遅延を測定するための方法である。上りリンクパケットは、データ無線ベアラ(DRB)を介して伝送されるパケットであって、OSI参照モデルの第2層に相当するMAC層/PLC層/PDCP層で取り扱うパケット(レイヤ2パケット)である。第2実施形態では、上りリンクパケットが、PDCP層の上位からPDCP層に到達したPDCP SDUであるケースを例示する。
次に、第2実施形態に係る動作シーケンスについて説明する。図7は、第2実施形態に係る動作シーケンスを示すシーケンス図である。図7の初期状態において、UE100はeNB200とのRRC接続を確立した状態(コネクティッド状態)であり、上りリンクにおいてユーザデータの送受信を行っていると仮定する。
上述したように、第2実施形態に係る測定制御方法は、eNB200において、UE100のバッファに蓄積された上りリンクパケットのデータ量を示すBSRをUE100から受信するステップと、当該BSRを受信した第1時点から、UE100からの受信データ量が当該BSRにより示されたデータ量に達したことに応じてUE100に送達確認(HARQ ACK)を送信した第2時点までの期間を示す上りリンクレイテンシを測定するステップと、を備える。これにより、上りリンクレイテンシの遅延測定情報をMDTにより収集可能とすることができる。
上述した第2実施形態では、BSRを利用して上りリンクレイテンシを測定していた。ここで、UE100は、上りリンクバッファに蓄積されたデータ量を優先度別(QCI別)に管理している。既存の仕様では、UE100の上りリンクバッファ内の既存データに比べて優先度が高い新規上りリンクパケットが発生した場合にはBSRがトリガされる。これに対し、当該既存データに比べて優先度が低い新規上りリンクパケットが発生した場合にはBSRがトリガされない。よって、第2実施形態に係る測定制御方法は、低優先度の上りリンクパケットのレイテンシを測定するケースに適用することが困難である。
第2実施形態の変更例では、低優先度の上りリンクパケットのレイテンシを正確に測定可能とするために、通常のBSRとは異なる特殊なBSRを導入する。
図9は、第2実施形態の変更例に係るUE100の動作を示すフロー図である。本フローは、UE100のMAC層において送信時間間隔(TTI)ごとに実行される。
次に、第2実施形態の変更例に係るMDT用BSRについて説明する。MAC PDU(Protocol Data Unit)は、主として、MACヘッダとMACペイロードとからなる。MACヘッダは、MACサブヘッダからなり、MACペイロードは、MAC制御要素、MAC SDU、及びパディングからなる。各MACサブヘッダは、論理チャネルID(LCID)及び長さ(L)フィールドからなる。LCIDは、MACペイロードの対応する部分がMAC制御要素であるかを示し、MAC制御要素ではない場合、関連するMAC SDUが属している論理チャネルを示す。Lフィールドは、関連するMAC SDUまたはMAC制御要素のサイズを示す。なお、MAC制御要素は、MACレベルのシグナリングに使用される。上りリンクではMAC制御要素はBSRの提供及び利用可能な電力を示すパワーヘッドルームの報告に使用される。
以下において、第3実施形態について、第1実施形態及び第2実施形態との相違点を主として説明する。第3実施形態は、システム構成については第1実施形態と同様である。
第3実施形態に係る測定制御方法は、LTEシステムにおいてUE100からeNB200に送信する上りリンクパケットの遅延を測定するための方法である。上りリンクパケットは、データ無線ベアラ(DRB)を介して伝送されるパケットであって、OSI参照モデルの第2層に相当するMAC層/PLC層/PDCP層で取り扱うパケット(レイヤ2パケット)である。第2実施形態では、上りリンクパケットが、PDCP層の上位からPDCP層に到達したPDCP SDUであるケースを例示する。
次に、第3実施形態に係る動作シーケンスについて説明する。図11は、第3実施形態に係る動作シーケンスを示すシーケンス図である。図11の初期状態において、UE100はeNB200とのRRC接続を確立した状態(コネクティッド状態)であり、上りリンクにおいてユーザデータの送受信を行っていると仮定する。
上述したように、第3実施形態に係る測定制御方法は、UE100において、上りリンクパケットが発生したタイミング以降の第1時点から、上りリンクパケットに対応する送達確認(HARQ ACK)をeNB200から受信した第2時点までの期間を示す上りリンクレイテンシを測定するステップと、上りリンクレイテンシを含んだ遅延測定情報を生成するステップと、遅延測定情報をeNB200に送信するステップと、を備える。これにより、上りリンクレイテンシの遅延測定情報をMDTにより収集可能とすることができる。
上述した第1実施形態及び第2実施形態では、eNB200においてレイテンシ測定を行うケースを例示したが、eNB200よりも上位のネットワーク装置がレイテンシ測定を行ってもよい。
日本国特許出願第2013-264614号(2013年12月20日出願)の全内容が、参照により、本願明細書に組み込まれている。
Claims (16)
- 移動通信システムにおいてネットワークからユーザ端末に送信する下りリンクパケットの遅延を測定するための測定制御方法であって、
前記ネットワークにおいて、
前記ユーザ端末の地理的位置を示す位置情報を前記ユーザ端末から受信するステップと、
前記下りリンクパケットが発生した第1時点から、前記下りリンクパケットに対応する送達確認を前記ユーザ端末から受信した第2時点までの期間を示す下りリンクパケット遅延を測定するステップと、
前記下りリンクパケット遅延を前記位置情報と関連付けることにより、前記下りリンクパケット遅延及び前記位置情報を含んだ遅延測定情報を生成するステップと、を備えることを特徴とする測定制御方法。 - 前記ネットワークにおいて、前記下りリンクパケット遅延の測定タイミングに関する時間情報を取得するステップをさらに備え、
前記遅延測定情報は、前記時間情報をさらに含むことを特徴とする請求項1に記載の測定制御方法。 - 移動通信システムにおいてユーザ端末からネットワークに送信する上りリンクパケットの遅延を測定するための測定制御方法であって、
前記ネットワークにおいて、
前記ユーザ端末のバッファに蓄積された前記上りリンクパケットのデータ量を示すバッファ状態報告を前記ユーザ端末から受信するステップと、
前記バッファ状態報告を受信した第1時点から、第2時点までの期間を示す上りリンクパケット遅延を測定するステップと、を備え、
前記第2時点は、前記ユーザ端末からの受信データ量が前記バッファ状態報告により示された前記データ量に達したことに応じて前記ユーザ端末に送達確認を送信した時点であることを特徴とする測定制御方法。 - 前記ネットワークにおいて、
前記ユーザ端末の地理的位置を示す位置情報を前記ユーザ端末から受信するステップと、
前記上りリンクパケット遅延を前記位置情報と関連付けることにより、前記上りリンクパケット遅延及び前記位置情報を含んだ遅延測定情報を生成するステップと、をさらに備えることを特徴とする請求項3に記載の測定制御方法。 - 前記ネットワークにおいて、前記上りリンクパケット遅延の測定タイミングに関する時間情報を取得するステップをさらに備え、
前記遅延測定情報は、前記時間情報をさらに含むことを特徴とする請求項4に記載の測定制御方法。 - 前記ネットワークにおいて、前記上りリンクパケット遅延を測定するMDTを構成するための構成情報を前記ユーザ端末に送信するステップと、
前記ユーザ端末において、前記構成情報に基づいて、前記バッファ状態報告として、前記MDTのための特殊なバッファ状態報告を送信するステップと、をさらに備えることを特徴とする請求項3に記載の測定制御方法。 - 前記特殊なバッファ状態報告は、前記バッファ内の既存データに比べて優先度が低い新規上りリンクパケットについてのデータ量を示す情報を含むことを特徴とする請求項6に記載の測定制御方法。
- 前記ユーザ端末において、
前記バッファに蓄積されたデータ量を優先度別に管理するステップと、
前記バッファ内の既存データに比べて前記新規上りリンクパケットの優先度が低い場合であっても、前記新規上りリンクパケットについてのデータ量を示す情報を含んだ前記特殊なバッファ状態報告を前記ネットワークに送信するステップと、をさらに備えることを特徴とする請求項7に記載の測定制御方法。 - 移動通信システムにおいてユーザ端末からネットワークに送信する上りリンクパケットの遅延を測定するための測定制御方法であって、
前記ユーザ端末において、
前記上りリンクパケットが発生したタイミング以降の第1時点から、前記上りリンクパケットに対応する送達確認を前記ネットワークから受信した第2時点までの期間を示す上りリンクパケット遅延を測定するステップと、
前記上りリンクパケット遅延を含んだ遅延測定情報を生成するステップと、
前記遅延測定情報を前記ネットワークに送信するステップと、を備えることを特徴とする測定制御方法。 - 前記第1時点は、前記上りリンクパケットが発生した発生時点、又は、前記発生した上りリンクパケットが反映されたバッファ状態報告を前記ネットワークに送信した送信時点であることを特徴とする請求項9に記載の測定制御方法。
- 前記測定するステップは、前記発生時点から前記送信時点までの期間を示す送信遅延を測定するステップを備え、
前記生成するステップは、前記遅延測定情報に前記送信遅延を含めるステップを備えることを特徴とする請求項10に記載の測定制御方法。 - 前記ユーザ端末において、前記ユーザ端末の地理的位置を示す位置情報を取得するステップをさらに備え、
前記生成するステップは、前記上りリンクパケット遅延を前記位置情報と関連付けることにより、前記上りリンクパケット遅延及び前記位置情報を含んだ遅延測定情報を生成するステップを備えることを特徴とする請求項9に記載の測定制御方法。 - 前記ユーザ端末において、前記上りリンクパケット遅延の測定タイミングに関する時間情報を取得するステップをさらに備え、
前記遅延測定情報は、前記時間情報をさらに含むことを特徴とする請求項12に記載の測定制御方法。 - 前記ネットワークにおいて、前記上りリンクパケット遅延を測定するMDTを構成するための構成情報を前記ユーザ端末に送信するステップをさらに備え、
前記構成情報は、前記上りリンクパケット遅延の測定を行うべき測定期間を指定する情報を含み、
前記測定するステップは、前記測定期間において、前記上りリンクパケット遅延を測定するステップを備え、
前記送信するステップは、前記測定期間の終了後に、前記遅延測定情報を前記ネットワークに送信するステップを備えることを特徴とする請求項9に記載の測定制御方法。 - 前記ユーザ端末において、前記測定期間が終了した時点でコネクティッド状態である場合に、前記遅延測定情報を送信するための通知を前記ネットワークに送信するステップをさらに備えることを特徴とする請求項14に記載の測定制御方法。
- 前記ユーザ端末において、前記測定期間が終了した時点でアイドル状態である場合に、前記アイドル状態からコネクティッド状態に遷移する際に、前記遅延測定情報を送信するための通知を前記ネットワークに送信するステップをさらに備えることを特徴とする請求項14に記載の測定制御方法。
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