WO2017195306A1 - Système de communication sans fil, station de transmission sans fil et station de réception sans fil - Google Patents

Système de communication sans fil, station de transmission sans fil et station de réception sans fil Download PDF

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Publication number
WO2017195306A1
WO2017195306A1 PCT/JP2016/064063 JP2016064063W WO2017195306A1 WO 2017195306 A1 WO2017195306 A1 WO 2017195306A1 JP 2016064063 W JP2016064063 W JP 2016064063W WO 2017195306 A1 WO2017195306 A1 WO 2017195306A1
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station
transmission
code number
wireless
radio
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PCT/JP2016/064063
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English (en)
Japanese (ja)
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政世 清水
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富士通株式会社
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • 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

Definitions

  • the technology described in this specification relates to a radio communication system, a radio transmission station, and a radio reception station.
  • 5G wireless communication system which is targeted for introduction around 2020, a significant performance improvement from the existing system, such as high-speed transmission of 10 Gbps or more and accommodation of a traffic volume 1000 times that of the existing system. Is the target.
  • 3GPP (3rd generation partnership project) LTE (long term evolution) -Advanced is also being studied for reducing communication delay. For example, a reduction in transmission time interval (transmission time interval, TTI) and a reduction in signal processing delay are being studied.
  • TTI transmission time interval
  • One of the factors that delays communication is the number of communication procedures and the waiting time in communication procedures. For example, a communication procedure required until the wireless terminal can actually transmit data to the base station may become a barrier for reducing communication delay.
  • one of the objects of the technology described in this specification is to reduce communication delay.
  • the wireless communication system may include a wireless transmission station and a wireless reception station.
  • the wireless transmission station may generate and transmit a plurality of orthogonal sequences corresponding to a code number selected from the plurality of code numbers.
  • a radio reception station receives the plurality of orthogonal sequences, estimates the code number selected by the radio transmission station from the plurality of orthogonal sequences, and wirelessly transmits a resource for data transmission to the estimated code number May be assigned to a station.
  • the wireless transmission station may include a selection unit and a transmission unit.
  • the selection unit may select a code number from a plurality of code numbers.
  • the transmission unit may generate and transmit a plurality of orthogonal sequences corresponding to the selected code number to the radio reception station.
  • the radio reception station may include a reception unit and a control unit.
  • the receiving unit may receive the plurality of orthogonal sequences generated and transmitted by the wireless transmission station corresponding to a code number selected from the plurality of code numbers.
  • the control unit may estimate the code number selected by the wireless transmission station from the received plurality of orthogonal sequences, and allocate data transmission resources to the wireless transmission station for the estimated code number.
  • communication delay can be reduced.
  • FIG. 4 is a block diagram illustrating a configuration example of a transmission processing unit provided in the wireless terminal illustrated in FIGS. 1 and 3. 4 is a flowchart illustrating an operation example of the wireless terminal illustrated in FIGS. 1 and 3.
  • FIG. 4 is a block diagram illustrating a configuration example of a transmission processing unit provided in the wireless terminal illustrated in FIGS. 1 and 3. 4 is a flowchart illustrating an operation example of the wireless terminal illustrated in FIGS. 1 and 3.
  • FIG. 4 is a block diagram illustrating a configuration example of a transmission processing unit provided in the base station illustrated in FIGS. 1 and 3.
  • FIG. 8 is a block diagram illustrating a configuration example of a delay profile generation unit illustrated in FIG. 7.
  • 4 is a flowchart illustrating an operation example of the base station illustrated in FIGS. 1 and 3.
  • (A) And (B) is a figure which respectively shows an example of the transmission sequence of three radio
  • (A) And (B) is a schematic diagram which shows an example of the delay profile produced
  • (A) And (B) is a figure which shows an example of the transmission sequence of three radio
  • (A) to (C) are schematic diagrams illustrating an example of a delay profile generated in a base station according to an embodiment.
  • (A) And (B) is a figure which shows an example of the transmission sequence of three radio
  • (A) to (C) are schematic diagrams illustrating an example of a delay profile generated in a base station according to an embodiment.
  • (A) And (B) is a schematic diagram for demonstrating cyclic delay amount setting control by the cyclic delay amount control part illustrated in FIG. It is a block diagram which shows the structural example of the radio
  • FIG. 1 is a block diagram illustrating a configuration example of a wireless communication system according to an embodiment.
  • the wireless communication system 1 illustrated in FIG. 1 may include, for example, a wireless terminal 11, a base station 12, and a core network 13.
  • a wireless terminal 11 may include, for example, a wireless terminal 11, a base station 12, and a core network 13.
  • attention is focused on one wireless terminal 11 and one base station 12, but there are two or more wireless terminals 11 and base stations 12 in the wireless communication system 1. You can do it.
  • the wireless terminal 11 can wirelessly communicate with the base station 12 in a wireless area formed or provided by the base station 12.
  • the “wireless terminal” may be referred to as “wireless device”, “wireless device”, “terminal device”, or the like.
  • the wireless terminal 11 may be a fixed terminal whose position does not change, or may be a mobile terminal (which may be referred to as a “mobile device”) whose position changes.
  • the wireless terminal 11 may be a mobile UE such as a mobile phone, a smartphone, or a tablet terminal.
  • UE is an abbreviation for “User Equipment”.
  • the base station 12 forms or provides a wireless area that enables wireless communication with the wireless terminal 11.
  • the “wireless area” may be referred to as “cell”, “coverage area”, “communication area”, “service area”, and the like.
  • the base station 12 may be, for example, an “eNB” compliant with a 3rd generation partnership project (3GPP) long term evolution (LTE) or LTE-Advanced (hereinafter collectively referred to as “LTE”).
  • 3GPP 3rd generation partnership project
  • LTE long term evolution
  • LTE-Advanced hereinafter collectively referred to as “LTE”.
  • ENB is an abbreviation for “enhanced Node B”.
  • a communication point that is separated from the base station main body and is located at a remote location such as remote radioequipment (RRE) or remote radiohead (RRH) may correspond to the base station 12.
  • RRE remote radioequipment
  • RRH remote radiohead
  • the base station 12 may correspond to a relay station that relays communication of the wireless terminal 11.
  • the relay station may correspond to LTE RN (Relay Node).
  • the “cell” formed or provided by the base station 12 may be divided into “sector cells”.
  • the “cell” may include a macro cell and a small cell.
  • a small cell is an example of a cell having a radio wave coverage (coverage) smaller than that of a macro cell.
  • the name of the small cell may be different depending on the coverage area.
  • the small cell may be referred to as “femtocell”, “picocell”, “microcell”, “nanocell”, “metrocell”, “homecell”, and the like.
  • the core network 13 may include an SGW 31, an MME 32, and a PGW 33 as illustrated in FIG.
  • SGW is an abbreviation for “Serving Gateway”.
  • PGW is an abbreviation of “Packet Data Data Network Gateway”.
  • MME is an abbreviation of “Mobility Management Entity”.
  • the core network 13 may be regarded as corresponding to an “upper network” for the base station 12.
  • the SGW 31, the MME 32, and the PGW 33 may be regarded as corresponding to an element (NE) or an entity of the “core network”, and may be collectively referred to as a “core node”.
  • the base station 12 may be connected to the core network 13 by an “S1 interface” which is an example of a wired interface. However, the base station 12 may be communicably connected to the core network 13 via a wireless interface.
  • a network including the base station 12 and the core network 13 may be referred to as a radio access network (RAN).
  • RAN radio access network
  • An example of RAN is “Evolved Universal Terrestrial Radio Access Network, E-UTRAN”.
  • the base station 12 may be communicatively connected to the SGW 31 and the MME 32, for example.
  • the base station 12 and the SGW 31 and the MME 32 may be communicably connected via an interface called an S1 interface, for example.
  • the SGW 31 may be communicably connected to the PGW 33 through an interface called an S5 interface.
  • the PGW 33 may be communicably connected to a packet data network (PDN) such as the Internet or an intranet.
  • PDN packet data network
  • User packets can be transmitted and received between the wireless terminal 11 and the PDN via the SGW 31 and the PGW 33.
  • the user packet is an example of user data, and may be referred to as a user plane signal.
  • the SGW 31 may process a user plane signal.
  • the control plane signal may be processed by the MME 32.
  • the SGW 31 may be communicably connected to the MME 32 via an interface called an S11 interface.
  • the MME 32 illustratively manages the location information of the wireless terminal 11.
  • the SGW 31 may perform movement control such as user plane signal path switching accompanying movement of the wireless terminal 11 based on the position information managed by the MME 32, for example.
  • the mobility control may include control associated with the handover of the radio terminal 11.
  • the radio area formed by the eNB may be a “cell” or a “sector”.
  • a cell formed by an eNB may be referred to as a “macro cell”.
  • a radio base station (eNB) that forms a macro cell may be referred to as a “macro base station”, a “macro eNB”, a “MeNB”, or the like.
  • a “cell” is an example of a wireless area formed according to the reachable range (also referred to as “coverage”) of a radio wave transmitted by a wireless base station.
  • a wireless device such as a mobile station located in a cell can wirelessly communicate with a wireless base station that forms the cell.
  • a small cell having a smaller coverage than the macro cell may be arranged in the macro cell (MC).
  • Small cell may include, for example, cells called “home cell”, “femto cell”, “pico cell”, “micro cell”, “metro cell”, and the like.
  • the eNB 12 may control setting (may be referred to as “allocation”) of radio resources used for communication with the UE 11. This control may be referred to as “scheduling”. Radio resources (sometimes simply referred to as “resources”) may be two-dimensionally distinguished by way of example in the frequency domain and the time domain.
  • the eNB 12 may perform scheduling in units obtained by dividing radio resources that can be used for communication with the UE 11 in the frequency domain and the time domain.
  • the minimum unit of scheduling is called a resource block (RB).
  • the RB exemplarily corresponds to one block obtained by dividing a resource available for radio communication between the eNB 12 and the UE 11 into a slot in the time domain and a plurality of adjacent subcarriers in the frequency domain. To do.
  • LTE RB is represented by 2 slots ⁇ 12 subcarriers.
  • SR scheduling request
  • the resource (sometimes referred to as “SR resource” for convenience) capable of transmitting the SR has a time (in other words, transmission timing) and a frequency specified for each UE 11 in advance from the eNB 12.
  • the standby time may be referred to as “SR resource standby time” for convenience, as illustrated in FIG.
  • the eNB 12 detects the reception of the SR transmitted by the UE 11, the eNB 12 performs resource scheduling, and notifies the UE 11 of the scheduled resource with a signal called “UL-Grant” (step S13).
  • the resource allocated to the UE 11 in the UL-Grant may be, for example, a resource that allows the UE 11 to transmit minimum data.
  • BSR buffer status report
  • the eNB 12 When the eNB 12 detects reception of the BSR, it schedules resources that can be allocated for the data amount notified by the BSR, and notifies the UE 11 of the scheduled resources again by UL-Grant (step S15).
  • the UE 11 When the UE 11 detects reception of the UL-Grant, the UE 11 transmits data to the eNB 12 using the resource specified by the UL-Grant (step S16). When the eNB 12 succeeds in receiving the data transmitted by the UE 11, the eNB 12 transmits an acknowledgment signal (ACK) to the transmission source UE 11 (step S17).
  • ACK acknowledgment signal
  • the UE 11 can transmit the SR at an arbitrary timing to eliminate or reduce the SR resource waiting time.
  • the number of procedures is reduced by transmitting SR and BSR together.
  • FIG. 3 shows an example of a UL transmission procedure in which the above two methods are combined and applied.
  • the transmission procedure may be referred to as a contention based UL transmission procedure.
  • the UE 11 may transmit, for example, a message including SR information and BSR information to the eNB 12 without waiting for the transmission timing of the SR resource (step S22).
  • a message including SR information and BSR information may be referred to as an “SR + BSR” message for convenience.
  • the eNB 12 When the eNB 12 detects the reception of the SR, the eNB 12 schedules resources that can be allocated for the data amount requested by the information of the BSR included in the SR, and notifies the UE 11 of the scheduled resources by UL-Grant ( Step S23).
  • the UE 11 When the UE 11 detects reception of the UL-Grant, the UE 11 transmits data to the eNB 12 using the resource specified by the UL-Grant (step S24). When the eNB 12 succeeds in receiving the data transmitted by the UE 11, the eNB 12 transmits an acknowledgment signal (ACK) to the transmission source UE 11 (step S25).
  • ACK acknowledgment signal
  • the time until the UE 11 can transmit data to the eNB 12 is the time of “SR resource standby time + 5 steps” in the transmission procedure of FIG.
  • the time can be shortened to 3 steps (S22 to S24).
  • the time required for one step is illustratively 4 ms in LTE.
  • the SR resource standby time is represented by “ ⁇ ”
  • ⁇ tends to increase as the number of UEs 11 connected to the eNB 12 increases.
  • ⁇ it is sufficient to secure a large amount of resources for SR transmission.
  • the amount of resources that can be allocated for data transmission is reduced, so that resource utilization efficiency can be reduced.
  • the transmission method for example, transmission format
  • the transmission method for example, transmission format of the “SR + BSR” message in step S22 is devised.
  • an SR collision may occur between the UEs 11.
  • orthogonal sequence multiplexing is applied to SR transmitted by a plurality of UEs 11.
  • a Zadoff-Chu sequence may be used as the orthogonal sequence (hereinafter, sometimes abbreviated as “sequence”).
  • the Zadoff-Chu sequence is an example of a CAZAC (Constant Amplitude Zero Zero-Correlation) sequence.
  • a CAZAC sequence has zero autocorrelation unless the phase difference is zero, and has a characteristic of being orthogonal to any signal sequence obtained by cyclically shifting itself.
  • an orthogonal sequence used by a plurality of UEs 11 for SR transmission is selected at random, for example, the same orthogonal sequence may be selected between different UEs 11.
  • the same orthogonal sequence may be selected between different UEs 11.
  • the number of orthogonal sequences that can be selected in the UE 11 may be increased.
  • reducing the collision occurrence rate of the orthogonal sequence means that the occurrence of the collision of the orthogonal sequence may not be completely eliminated and the occurrence of the collision may be allowed although the probability is low.
  • the transmission procedure illustrated in FIG. 3 is an example of a transmission procedure in which the possibility of collision of a plurality of sequences remains, and may be referred to as a “collision (contention) -based UL transmission procedure”.
  • information of BSR is associated with an orthogonal sequence displaying SR.
  • different orthogonal sequences are associated with different BSR information.
  • the information of the BSR can be implicitly (or indirectly) displayed in the SR by the orthogonal sequence selected by the UE 11 for transmission of the SR.
  • the resource consumption can be reduced compared to the BSR information separately from the SR information.
  • the more types of BSR information that can be displayed the greater the number of prepared orthogonal sequences.
  • a plurality of orthogonal sequences are generated for the identifier of the orthogonal sequence selected by the UE 11, for example, from the viewpoint of reducing the collision occurrence probability of the orthogonal sequences and using resources efficiently.
  • the identifier of the orthogonal sequence may be referred to as “sequence ID” for convenience.
  • N is illustratively an integer of 2 or more sequence IDs that can be selected
  • M is illustratively an integer of 2 or more sequence IDs can be selected.
  • N is illustratively an integer of 2 or more sequence IDs that can be selected
  • M is illustratively an integer of 2 or more sequence IDs can be selected.
  • ID is assigned to the combination.
  • the identifier of the combination may be referred to as “combination ID” or “code number” for convenience.
  • the UE 11 generates a plurality of orthogonal sequences corresponding to the selected code number and transmits it to the eNB 12.
  • eNB12 detects the combination of the orthogonal sequence which UE11 transmitted from the received some orthogonal sequence, and detects the code number which UE11 selected.
  • the “detection” of the code number may be rephrased as “specification” or “estimation” of the code number.
  • the plurality of orthogonal sequences transmitted by the same UE 11 include the same propagation path information (may be referred to as “channel information”) and are received by the eNB 12. Since the propagation path between the UE 11 and the eNB 12 is different for each UE 11, the eNB 12 uses the difference in the propagation path information to combine the orthogonal sequences transmitted by the UE 11, in other words, the code number selected by the UE 11. Can be identified or specified.
  • the eNB 12 has succeeded in detecting and receiving the SR, so that the resource used by the UE 11 for data transmission can be scheduled.
  • the eNB 12 can transmit the data amount that the UE 11 wants to transmit from the specified code number. Can be detected and identified.
  • the information of the BSR associated with the code number may illustratively be a data size range that the UE 11 desires to transmit.
  • the eNB 12 stores and manages information (which may be referred to as “code number versus data size information”) 100 that associates a code number with a data size range.
  • the code number vs. data size information 100 may be stored and managed as table format information as illustrated in FIG. 4, or may be stored and managed in other formats.
  • the eNB 12 may transmit and notify the code number versus data size information 100 to the UE 11. Thereby, the UE 11 can select a code number corresponding to the transmission data size. Moreover, in eNB12, it becomes possible to identify the transmission data size of UE11 by the detection of the said code number.
  • the notification of the code number vs. data size information 100 to the UE 11 may be exemplarily performed using broadcast information, or performed individually when the UE 11 is connected to a call (for example, when an RRC connection is established). Also good.
  • RRC is an abbreviation for “radio resource control”.
  • the UE 11 When transmission data is generated, the UE 11 refers to the code number vs. data size information 100, selects one code number from the code number group corresponding to the transmission data amount, and corresponds to the selected code number as described above. Generate and transmit multiple orthogonal sequences.
  • the UE 11 when the UE 11 holds 400-byte data as data to be transmitted to the eNB 12, the UE 11 selects one code number from the group of code numbers # 21 to # 30.
  • the code number selection in the code number group may be performed randomly, for example.
  • ENB 12 tries to detect a code number selected by UE 11 from a plurality of orthogonal sequences received from UE 11.
  • the eNB 12 specifies the data size corresponding to the detected code number, for example, in the code number versus data size information 100 illustrated in FIG.
  • the eNB 12 can perform resource scheduling according to the specified data size. When the scheduling is successful, the eNB 12 can transmit the scheduled resource allocation information to the UE 11 by UL-Grant (see step S23 in FIG. 3).
  • the multiplexing number can be substantially increased by generating a plurality of orthogonal sequences corresponding to the code number selected by the UE 11 and transmitting it to the eNB 12.
  • the collision occurrence rate between the UEs 11 can be reduced. For example, even if the UE 11 transmits a sequence corresponding to the SR message without waiting for the SR resource waiting time, the success rate of sequence detection at the eNB 12 can be improved. . Therefore, the SR resource standby time can be reduced in the UL transmission procedure.
  • the eNB 12 can detect information corresponding to the BSR by detecting the code number.
  • the eNB 12 can start scheduling of resources according to the data size corresponding to the detected code number without waiting for reception and detection of the BSR separate from the SR. Therefore, SR transmission and BSR transmission can be combined into one transmission procedure, and the number of UL transmission procedures can be reduced.
  • FIG. 5 shows a configuration example of the transmission processing unit 50 that realizes the transmission processing described above.
  • the transmission processing unit 50 illustrated in FIG. 5 may be provided in the UE 11.
  • the wireless device including the transmission processing unit 50 is an example of a wireless transmission station. Therefore, UE11 is an example of a radio transmission station.
  • FIG. 6 shows an operation example of the UE 11.
  • the transmission processing unit 50 may include a code number selection unit 51 and two sequence transmission units 52-1 and 52-2, for example.
  • the transmission processing unit 50 may include a cyclic delay amount control unit 53.
  • sequence transmission units 52-1 and 52-2 may be abbreviated as the sequence transmission unit 52 when not distinguished from each other.
  • code number selection unit 51 may be abbreviated as “number selection unit 51” for convenience.
  • the number selection unit 51 refers to the information 100 in FIG. 4 and selects one code number from the code number group corresponding to the data size to be transmitted. Selection is made (step S62 in FIG. 6).
  • two orthogonal sequences are illustratively generated by the two sequence transmission units 52-1 and 52-2 (step S63 in FIG. 6).
  • two orthogonal sequences corresponding to the new sequence ID are generated by the sequence transmission unit 52- 1 and 52-2.
  • the above example is an example in which the upper and lower bits of the selected code number are used in a rule for generating a plurality of orthogonal sequences from the selected code number. May be applied. If the rule is shared by the UE 11 and the eNB 12, the code number selected by the UE 11 in the eNB 12 can be detected.
  • the UE 11 and the eNB 12 may share the rule.
  • three or more sequence transmission units 52 may be provided in the transmission processing unit 50 corresponding to each orthogonal sequence.
  • the sequence transmission unit 52 exemplarily includes a sequence generation unit 521, a discrete Fourier transformer (DFT) 522, a subcarrier mapper 523, an inverse discrete Fourier transformer (IDFT) 524, and a cyclic delay / CP adder 525. It's okay.
  • DFT discrete Fourier transformer
  • IDFT inverse discrete Fourier transformer
  • DFT is an abbreviation for “discrete Fourier transformer”
  • IDFT is an abbreviation for “inverse discrete Fourier transformer”.
  • CP is an abbreviation for “cyclic prefix”.
  • the CP is sometimes referred to as a guard interval (GI).
  • the sequence generation unit 521 exemplarily generates an orthogonal sequence from the selected code number.
  • the orthogonal sequence may be generated using a Zadoff-Chu sequence, for example, like a random access preamble.
  • the DFT 522 illustratively converts the orthogonal sequence generated by the sequence generation unit 521 into a frequency domain signal by performing a discrete Fourier transform.
  • the subcarrier mapper 523 illustratively maps the orthogonal sequence converted into the frequency domain signal by the DFT 522 onto, for example, a subcarrier corresponding to the SR resource.
  • the IDFT 524 illustratively converts the orthogonal sequence mapped to the subcarrier corresponding to the SR resource by the subcarrier mapper 523 into a time domain signal.
  • the cyclic delay / CP adder 525 exemplarily delays the orthogonal sequence, which is a time domain signal input from the IDFT 524, according to control from the cyclic delay amount control unit 53, and adds a CP to the orthogonal sequence. .
  • the cyclic delay amount may be set to the same amount by the cyclic delay amount control unit 53 in the two sequence transmission units 52-1 and 52-2.
  • the eNB 12 can easily distinguish the difference in the propagation path of the orthogonal sequences transmitted by different UEs 11.
  • path timings For example, if the UE 11 is different, the propagation path to and from the eNB 12 is also different. Therefore, a set of orthogonal sequences propagated through different propagation paths is easily received at the eNB 12 at different timings (may be referred to as path timings).
  • the eNB 12 can easily distinguish between a pair of orthogonal sequences having the same transmission source and a pair of orthogonal sequences having different transmission sources from the path timing of the orthogonal sequence.
  • the cyclic delay amount may be set and controlled separately from the CP when the CP is added to the orthogonal sequence in the time domain.
  • a specific setting example of the cyclic delay amount will be described later with reference to FIGS. 17 (A) and 17 (B).
  • the cyclic delay amount control unit 53 controls the cyclic delay / CP adder 525 as described above to control the cyclic delay amount given to the two orthogonal sequences.
  • the two orthogonal sequences generated by the two sequence transmission units 52-1 and 52-2 as described above are transmitted to the eNB 12 as “SR + BSR” messages (step S22 in FIG. 3).
  • the two orthogonal sequences may be transmitted at different frequencies (in other words, frequency division) or may be transmitted in time division (step S64 in FIG. 6).
  • frequency division frequencies
  • time division time division
  • the SR transmission resource may be preliminarily notified from the eNB 12 or notified when the call is connected.
  • the SR transmission resource only the frequency of the frequency and time may be allocated from the eNB 12, and the time may be arbitrary. In other words, time resources can be shared between UEs 11.
  • step S65 in FIG. 6 and step S24 in FIG. 3 the UE 11 performs UL data transmission using the resource specified in the UL-Grant (FIG. 6). Step S66 and step S24 of FIG. 3).
  • the UE 11 may retransmit two orthogonal sequences (step S64).
  • FIG. 7 illustrates a configuration example of the reception processing unit 70 that receives the orthogonal sequence transmitted by the transmission processing unit 50 described above.
  • the reception processing unit 70 illustrated in FIG. 7 may be provided in the eNB 12.
  • FIG. 8 shows an operation example of the eNB 12.
  • a wireless device including the reception processing unit 70 is an example of a wireless reception station. Therefore, the eNB 12 is an example of a radio reception station.
  • the reception processing unit 70 may include, for example, a CP remover 71, a DFT 72, a delay profile generation unit 73, and a sequence ID combination detection unit 74.
  • the CP remover 71 and the DFT 72 may be provided for each subframe in which an orthogonal sequence can be received. Further, in order to generate a delay profile for each sequence ID, the delay profile generation unit 73 may be provided for each sequence ID, for example.
  • each sequence ID may be multiplexed per subframe.
  • eight systems ID # 0 to ID # 7 of delay profile generation units 73 may be provided. Note that the generation of the delay profile for each sequence ID may be parallel processing or time-division processing.
  • the received signal is input to the reception processing unit.
  • the CP remover 71 illustratively removes the CP when the CP is added to the received signal.
  • the DFT 72 illustratively performs a discrete Fourier transform on the reception signal from which the CP has been removed by the CP remover 71 to convert the reception signal from a time domain signal to a frequency domain signal.
  • the received signal converted into the frequency domain signal by the DFT is exemplarily input to the delay profile generation unit 73.
  • the delay profile generation unit 73 illustratively generates a delay profile based on the received signal input from the DFT 72 and extracts channel information.
  • Each of the delay profile generation units 73 may include, for example, a replica generation unit 731, a DFT 732, a replica multiplier 733, and an IDFT 734 as illustrated in FIG.
  • the replica generation unit 731 exemplarily generates replicas corresponding to the sequence # 0 and the sequence # 1.
  • replicas # 0 and # 1 of orthogonal sequences corresponding to the two sequence IDs # 0 and # 1, respectively, are generated in the replica generation unit 731.
  • the replica when a Zadoff-Chu sequence is used for an orthogonal sequence as in the case of a random access preamble, the replica may be referred to as a “preamble replica” for convenience.
  • the DFT 732 illustratively performs a discrete Fourier transform on the replica generated by the corresponding replica generation unit 731 and converts the replica from a time domain signal to a frequency domain signal, similar to the received signal.
  • the replica multiplier 733 multiplies the frequency domain received signal input from the DFT 72 by the frequency domain replica input from the DFT 732 (may be referred to as “correlation detection processing”). As a result, a delay profile corresponding to the replica generated by the replica generation unit 731 is generated (step S82 in FIG. 9).
  • the UE 11 transmits a plurality of orthogonal sequences by frequency division, if a signal obtained by separating the output result of the DFT 72 for each transmission frequency band of the sequence is input to the delay profile generation unit 73, it corresponds to each orthogonal sequence.
  • a delay profile can be generated.
  • the IDFT 734 illustratively converts the multiplication result of the replica multiplier 733 from a frequency domain to a time domain signal by performing an inverse discrete Fourier transform.
  • a plurality of delay profiles are generated by performing the above processing for each subframe and each sequence ID.
  • the delay profile f (t) can be expressed as a result of multiplying a known replica waveform g (t) by channel information, as shown in the following Equation 1.
  • Equation 1 “h i ” represents the channel of the i-th path between the UE 11 and the eNB 12, and “ ⁇ i ” represents the delay time from the reference timing of the i-th path.
  • the channel h i is different for each UE11, same UE11 is included the same channel information to the first sequence and the second sequence transmitted. Therefore, as illustrated below, the combination of the first sequence and the second sequence transmitted by the same UE 11 can be detected based on the delay profile generated for each replica.
  • three UEs # 1 to # 3 transmit two orthogonal sequences in time division using any two of the three sequence IDs # 1 to # 3, respectively. Assuming that
  • UE # 1, UE # 2, and UE # 3 respectively have (ID # 2, ID # 1), (ID # 1, ID # 2) in (subframe # 1, subframe # 2). ) And (ID # 1, ID # 3) are assumed to be transmitted as two orthogonal sequences.
  • ID # 1 and ID # 2 are detected in the subframe # 1, and ID # 1, ID # 2, And ID # 3 is detected.
  • ID # 1 and ID # 2 are detected in the subframe # 1, and ID # 1, ID # 2, And ID # 3 is detected.
  • ID # 3 is detected in the subframe # 1
  • ID # 1 and ID # 2 are detected in the subframe # 1
  • ID # 1 and ID # 2 are detected in the subframe # 1
  • ID # 1 and ID # 2 are detected in the subframe # 1
  • ID # 1 and ID # 2 are detected in the subframe # 1
  • ID # 1 and ID # 2 are detected in the subframe # 1
  • ID # 1 and ID # 2 are detected in the subframe # 1
  • ID # 2 is detected in the subframe # 1
  • ID # 2 is detected in the subframe # 1
  • ID # 2 is detected in the subframe # 1
  • ID # 2 is detected in the subframe # 1
  • ID # 2 is detected in the subframe # 1
  • ID # 2 is detected in the subframe # 1
  • 2 ⁇ 3 6 combinations of transmission sequences are possible as illustrated in FIG.
  • the eNB 12 detects a correct combination of sequences actually transmitted by each of the UEs # 1 to # 3 from the six combinations.
  • a combination of two orthogonal sequences actually transmitted by UE # 1 in two subframes # 1 and # 2 is indicated by a combination ID # 4 (ID # 2) as illustrated in FIG. , ID # 1).
  • combinations of two orthogonal sequences actually transmitted by UE # 2 and UE # 3 are indicated by combinations ID # 2 and ID # 3 (ID # 1, ID # 2) and (ID #, respectively). 1, ID # 3).
  • the delay profile described above is used to detect the correct combination.
  • the delay profile indicates a multipath temporal power distribution generated in the wireless propagation path, and is an example of an index of propagation delay characteristics.
  • FIGS. 12A and 12B show examples of delay profile generation.
  • the horizontal axis represents “time”.
  • the vertical axis is not shown, it represents the reception level (for example, power). This also applies to FIGS. 14A to 14C and FIGS. 16A to 16C described later.
  • FIG. 12A is a diagram illustrating an example of a delay profile p j (t) generated by multiplying the reception signal of subframe # 1 by a replica corresponding to sequence ID #j.
  • FIG. 12B is a diagram illustrating an example of a delay profile q k (t) generated by multiplying the reception signal of subframe # 2 by a replica corresponding to sequence ID #k.
  • the delay profile p 1 (t) generated using the replica corresponding to the sequence ID # 1 in the subframe # 1 includes the UE # 2 and the UE # 3. Channel information is mixed.
  • the delay profile p 2 (t) generated using the replica corresponding to the sequence ID # 2 in the subframe # 1 includes UE # 1 to UE #.
  • 3 includes channel information of only UE # 1.
  • the delay profile q 1 (t) generated using the replica corresponding to the sequence ID # 1 in the subframe # 2 includes UE # 1 to UE #.
  • 3 includes channel information of only UE # 1.
  • the delay profile q 2 (t) generated using the replica corresponding to the sequence ID # 2 in the subframe # 2 includes UE # 1 to UE #. 3 includes only channel information of UE # 2.
  • the delay profile q 3 (t) generated using the replica corresponding to the sequence ID # 3 in the subframe # 2 includes UE # 1 to UE #. 3 includes channel information of only UE # 3.
  • the channel information of UE11 is expressed so as to be visually distinguishable, but in reality, the channel information of UE11 is delayed. It can be considered that it cannot be extracted from the profile.
  • the delay profile p j (t) generated by multiplying the replica corresponding to the sequence ID #j other than the above in the subframes # 1 and # 2 is determined to have a low reception level and no signal. It is not described in FIG. 12 (A) and FIG. 12 (B).
  • S (j, k) means that a signal is added if channel information of the same UE 11 is included in the combination of (j, k).
  • N (j, k) means that if the channel information of the same UE 11 is included in the combination of (j, k), the signals cancel each other, so that the noise component and the interference channel component remain. To do.
  • a threshold Th is set for the determination index value S (j, k) / N (j, k).
  • the eNB 12 may determine that the combination of (j, k) satisfying the following Equation 3 is a combination of sequences actually transmitted by the UE 11 (in step 84 of FIG. 9). YES and step S85). Note that “determination” may be paraphrased as “estimation” or “detection”.
  • the eNB 12 can detect the code number that is the generation source of the combination in the UE 11, in other words, the code number selected by the code number selection unit 51 from, for example, the information illustrated in FIG. Step S86 in FIG. 9).
  • Table 1 below shows an example of a correspondence relationship between a code number and a combination of sequence IDs.
  • 11 represents the concept of assigning a code number to a combination of sequence IDs, the numerical example in FIG. 11 and the numerical example in Table 1 below do not necessarily match.
  • the eNB 12 Based on the code number detected by the sequence ID combination detection unit 74, the eNB 12 specifies the data size that the UE 11 desires to transmit from, for example, the code number versus data size information 100 illustrated in FIG. 4 (step S87 in FIG. 9). .
  • the eNB 12 performs resource scheduling according to the data size (step S88 in FIG. 9).
  • the processes in steps S87 and S88 described above may be exemplarily performed by the scheduler 1241 described later with reference to FIG.
  • the eNB 12 transmits resource allocation information to the source UE 11 that has transmitted the detected combination of sequences by UL-Grant (step S89 in FIG. 9 and step S23 in FIG. 3).
  • the UE 11 that has received the UL-Grant performs data transmission using the resource specified by the UL-Grant (Step S66 in FIG. 6 and Step S24 in FIG. 3).
  • the sequence ID combination detection unit 74 determines whether the (j, k) has not been transmitted from the UE 11. In this case, if there is an undetermined combination, the sequence ID combination detection unit 74 may perform the comparison determination with the threshold Th for the combination as described above.
  • the delay profile p 1 (t) includes the channel information of UE # 3 and UE # 2 as interference channel components, N (1,2) and N (1,3) depending on the interference channel components The value of tends to increase. Therefore, depending on the setting of the threshold Th, there is a possibility that the correct sequence combination transmitted by the UE 11 cannot be detected.
  • the sequence ID combination detection unit 74 adds the delay profiles q 2 (t) and q 3 (t) of the subframe # 2 and the delay profile p 1 (t) of the subframe # 1.
  • the index values S and N shown in Equation 4 below may be calculated.
  • the sequence ID combination detection unit 74 as exemplified by the following formula 5, if the determination index value, which is a value obtained by dividing the index value S by the index value N, exceeds the threshold Th1, the combination (1, 2) and It may be determined that the combination (1, 3) sequence has been transmitted.
  • sequence ID combination detection unit 74 can simultaneously determine a plurality of sequence combinations.
  • three UEs # 1 to # 3 transmit three orthogonal sequences in time division using any two of the three sequence IDs # 1 to # 3, respectively. Assuming that
  • UE # 1 transmits three orthogonal sequences in a combination of (ID # 2, ID # 1, ID # 2) in three subframes # 1 to # 3. It is assumed that UE # 2 has transmitted three orthogonal sequences in a combination of (ID # 1, ID # 2, ID # 2) in three subframes # 1 to # 3. It is assumed that UE # 3 transmits three orthogonal sequences in a combination of (ID # 1, ID # 3, ID # 1) in three subframes # 1 to # 3.
  • ID # 1 and ID # 2 are detected in the subframe # 1, and ID # 1, ID # 2, And ID # 3 is detected. Also, ID # 1 and ID # 2 are detected in subframe # 3.
  • the delay profile generator 73 generates and detects a delay profile as exemplified in FIGS. 14A to 14C for each of the subframes # 1 to # 3.
  • delay profiles p 1 (t) and p 2 (t) as illustrated in FIG. 14A are generated and detected.
  • the delay profiles p 1 (t) and p 2 (t) illustrated in FIG. 14A are the same as the delay profiles p 1 (t) and p 2 (t) illustrated in FIG. You may think that.
  • delay profiles q 1 (t), q 2 (t), and q 3 (t) as illustrated in FIG. 14B are generated and detected.
  • the delay profiles q 1 (t), q 2 (t), and q 3 (t) exemplified in FIG. 14B are the delay profiles q 1 (t), q 2 (exemplified in FIG. 12B, respectively.
  • t) and q 3 (t) may be considered identical.
  • Figure 14 the delay profile as illustrated in (C) r 1 (t) and r 2 (t) is generated and detected.
  • the delay profile r 1 (t) is generated by multiplying the reception signal of the subframe # 3 by a replica corresponding to the sequence ID # 1.
  • the delay profile r 2 (t) is generated by multiplying the reception signal of the subframe # 3 by a replica corresponding to the sequence ID # 2.
  • the delay profile r 1 (t) generated for subframe # 3 includes channel information for only UE # 3 among UE # 1 to UE # 3. It is.
  • the delay profile r 2 (t) generated for subframe # 3 includes UE # 1 and UE # 2 of UE # 1 to UE # 3.
  • the channel information is mixed.
  • the determination and detection of sequence combinations in subframes # 1 and # 2 may be the same as in the first example or the second example of the combination determination process described above.
  • sequence ID combination detection unit 74 detects the following three sequence ID combinations in the combination of (subframe # 1, subframe # 2, subframe # 3). Note that “xxx” represents a subframe whose sequence ID is not detected.
  • the sequence combination in subframes # 2 and # 3 is, for example, the result of adding delay profiles q 1 (t) and q 2 (t) of subframe # 2 and the delay profile r 2 (t) of subframe # 3. And may be detected.
  • sequence ID combination detection unit 74 performs the combination (xxx, # ID1, # ID # 2) and the combination (xxx, ID # 2, ID # 1) in the same manner as the “second example of the combination determination process”. And may be detected simultaneously. Further, the sequence ID combination detection unit 74 determines the combination (xxx, ID # 3, ID # 2) from the delay profile q 3 (t) of subframe # 2 and the delay profile r 1 (t) of subframe # 3. May be detected.
  • the sequence ID combination detection unit 74 when paying attention to the result of subframe # 2, the sequence ID combination detection unit 74 performs the combination (ID # 1, ID # 2, ID # 2) and the combination (ID # 1, ID # 3, ID # 1). And a combination (ID # 2, ID # 1, ID # 2) can be estimated.
  • UE # 1 transmits three orthogonal sequences in a combination of (ID # 2, ID # 1, ID # 1) in subframes # 1 to # 3.
  • UE # 2 transmits three orthogonal sequences in a combination of (ID # 1, ID # 1, ID # 2) in subframes # 1 to # 3.
  • ID # 1 and ID # 2 are detected in each of subframes # 1 and # 3, and ID # 1 is detected in subframe # 2. Is detected.
  • the delay profile generator 73 generates and detects delay profiles as exemplified in FIGS. 16A to 16C for each of the subframes # 1 to # 3.
  • delay profiles p 1 (t) and p 2 (t) as illustrated in FIG. 16A are generated and detected.
  • the delay profile p 1 (t) includes channel information of only UE # 2 of UE # 1 and UE # 2.
  • the delay profile p 2 (t) includes a channel information of the UE # 1 only of the UE # 1 and UE # 2.
  • a delay profile q 1 (t) as illustrated in FIG. 16B is generated and detected.
  • channel information of UE # 1 and channel information of UE # 2 are mixed.
  • delay profiles r 1 (t) and r 2 (t) as illustrated in FIG. 16C are generated and detected.
  • the delay profile r 1 (t) includes channel information of only UE # 1 out of UE # 1 and UE # 2.
  • the delay profile r 2 (t) includes a channel information of the UE # 2 only of the UE # 1 and UE # 2.
  • the correct combination is based on the detection results for subframes # 1 and # 2 and the detection results for subframes # 2 and # 3. It can not be identified.
  • the sequence ID combination detection unit 74 may determine and detect the combination of sequence IDs from the delay profile in the same manner for the combinations of subframes # 1 and # 3, for example.
  • sequence ID combination detection unit 74 detects the combination (ID # 1, xxx, ID # 2) and the combination (ID # 2, xxx, ID # 1) for the subframes # 1 and # 3.
  • sequence ID combination detection unit 74 can estimate the combination (ID # 1, ID # 1, ID # 2) and the combination (ID # 2, ID # 1, ID # 1).
  • the contention-based UL transmission procedure that can reduce the SR resource waiting time and the number of communication procedures as illustrated in FIG. realizable. Therefore, communication delay can be reduced.
  • the terminal portion of transmission data (for example, modulation symbol) is copied and added as a CP at the head.
  • the length of the CP is illustratively determined by the propagation delay time allowed from the corresponding cell radius.
  • the CP size and the size corresponding to the cyclic delay amount are copied from the end of the modulation symbol to the head. Append.
  • the range of cyclic delay that can be set depends on the cyclic shift amount that generates the transmission sequence.
  • a plurality of sequence IDs can be generated by performing a cyclic shift that is a constant multiple of the reference shift amount.
  • Equation 6 and Equation 7 are described in, for example, Section 5.7.2 “Preamble Sequence generation” of Non-Patent Document 1.
  • the reference shift amount Ncs is set in consideration of the propagation delay, but the delay can be set in a redundant range. For example, if the propagation delay is shifted by a maximum of 3 samples (in other words, the CP length is 3 samples), a delay insertion of a maximum of “(Ncs ⁇ 1) ⁇ 3” samples is possible. However, Ncs> 4 (sample).
  • the UE 11 may select and set the cyclic delay amount in the range of the “(Ncs-1) -3” sample or less.
  • the selection of the cyclic delay amount may be performed randomly, for example.
  • FIG. 18 is a block diagram illustrating a configuration example of the UE 11 according to an embodiment.
  • the UE 11 may include an antenna 110, a radio unit 111, a reception baseband processing unit 112, a transmission baseband processing unit 113, and a control unit 114, for example.
  • the antenna 110 illustratively radiates the UL transmission radio signal output from the radio unit 111 to the space, and receives the DL radio signal and outputs the DL radio signal to the radio unit 111.
  • the radio unit 111 illustratively down-converts a DL received radio signal input from the antenna 110 into a baseband signal and outputs the baseband signal to the received baseband processing unit 112.
  • Radio section 111 up-converts the transmission baseband signal input from transmission baseband processing section 113 into a radio signal and outputs the radio signal to antenna 110.
  • the antenna 110 and the radio unit 111 are shared by the reception baseband processing unit 112 and the transmission baseband processing unit 113, but may be individually provided for each processing unit 112 and 113. I do not care.
  • the reception baseband processing unit 112 illustratively demodulates and decodes the reception baseband signal input from the radio unit 111 and outputs DL reception data and DL control information.
  • the DL control information may be input to the control unit 114, for example.
  • the DL control information may include the above-described code number versus data size information 100 and UL-Grant.
  • the reception baseband processing unit 112 is an example of a receiving unit that receives the code number versus data size information 100 from the eNB 12.
  • the received code number versus data size information 100 may be stored in a storage unit 1142 described later of the control unit 114.
  • the transmission baseband processing unit 113 illustratively encodes and modulates UL transmission data and UL control information, and outputs the encoded data to the radio unit 111.
  • the UL control information may include information (for example, a code number) for generating the aforementioned “SR + BSR” message.
  • the code number may be selected by the control unit 114 as an example.
  • the transmission baseband processing unit 113 may include a data processing unit 1131, a UL message generation unit 1132, and a framer 1133 as illustrated in FIG.
  • the data processing unit 1131 illustratively encodes and modulates UL transmission data and outputs the encoded data to the framer 1133.
  • the UL message generation unit 1132 exemplarily generates a UL message addressed to the eNB 12.
  • An example of the UL message is the “SR + BSR” message described above.
  • the UL message generation unit 1132 when transmission data is generated in the UE 11, the UL message generation unit 1132 generates the above-described “SR + BSR” message. Therefore, it may be understood that the UL message generation unit 1132 includes the transmission processing unit 50 illustrated in FIG.
  • the framer 1133 maps the output signals of the data processing unit 1131 and the UL message generation unit 1132 to a predetermined frame (for example, an LTE subframe) and outputs the result to the radio unit 111.
  • a predetermined frame for example, an LTE subframe
  • the control unit 114 illustratively controls the operation and processing of the UE 11.
  • the control unit 114 may control DL reception processing and UL transmission processing in the UE 11.
  • the control unit 114 may include a code number selection unit 1141 and a storage unit 1142.
  • the code number selection unit 1141 may correspond to the code number selection unit 51 illustrated in FIG. In other words, the code number selection unit 51 may be provided in the UL message generation unit 1132 or may be provided in the control unit 114.
  • the storage unit 1142 exemplarily stores various information such as system information and control information respectively used for UL transmission processing and DL reception processing.
  • the system information may include, for example, a master information block (master information block, MIB) and a system information block (system information block, SIB).
  • the storage unit 1142 may store code numbers that can be selected by the UE 11 (exemplarily, the code number selection unit 1141) and the code number versus data size information 100 illustrated in FIG.
  • a semiconductor memory such as random access memory (RAM) or read only memory (ROM) may be applied to the storage unit 1142.
  • the ROM may be a flash memory.
  • control unit 114 for example, a central processing unit (CPU) may be used, or alternatively or additionally, an integrated circuit (Integrated circuit, IC) such as a micro processing unit (MPU), digital, A signal processor (DSP) may be used.
  • CPU central processing unit
  • IC integrated circuit
  • MPU micro processing unit
  • DSP digital signal processor
  • CPU, MPU, DSP and the like are examples of a processor circuit or a processor device having a computing capability.
  • a processor circuit or processor device with computing power may be referred to as a “computer” for convenience.
  • processing units 112 and 113 and the control unit 114 may be realized by a “computer” such as a CPU, MPU, or DSP, or a programmable logic including the “computer”. It may be realized using a device.
  • a “programmable logic device” is field programmable gate array (FPGA).
  • the code number selection unit 1141 refers to the code number versus data size information 100 in the storage unit 1142, and corresponds to the transmission data size. Select a code number. The selected code number is given to the UL message generation unit 1132.
  • the UL message generation unit 1132 generates a plurality of orthogonal sequences from the given code numbers as described above with reference to FIGS.
  • the orthogonal sequence represents an “SR + BSR” message.
  • the generated “SR + BSR” message is transmitted from the antenna 110 to the eNB 12 through the framer 113 and the radio unit 111.
  • the control unit 114 causes the data processing unit 1131 and the data processing unit 1131 and the data to be transmitted using the resource specified by the UL-Grant.
  • the framer 1133 is controlled.
  • FIG. 19 is a block diagram illustrating a configuration example of the eNB 12 according to an embodiment.
  • the eNB 12 may include, for example, an antenna 120, a radio unit 121, a reception baseband processing unit 122, a transmission baseband processing unit 123, and a control unit 124.
  • the antenna 120 illustratively radiates the DL transmission radio signal output from the radio unit 121 to the space, receives the UL radio signal, and outputs the UL radio signal to the radio unit 121.
  • the radio unit 121 illustratively down-converts a UL received radio signal input from the antenna 120 into a baseband signal and outputs the baseband signal to the received baseband processing unit 122.
  • Radio section 121 up-converts the transmission baseband signal input from transmission baseband processing section 123 into a radio signal and outputs the radio signal to antenna 120.
  • the antenna 120 and the radio unit 121 are shared by the reception baseband processing unit 122 and the transmission baseband processing unit 123, but may be separately provided for each processing unit 122 and 123. I do not care.
  • the reception baseband processing unit 122 illustratively demodulates and decodes the reception baseband signal input from the wireless unit 121, and outputs UL reception data and UL control information.
  • the UL control information may be input to the control unit 124, for example.
  • the UL control information may include the aforementioned “SR + BSR” message.
  • the reception baseband processing unit 122 may include a deframer 1221, a data processing unit 1222, and a UL message detection unit 1223 as illustrated in FIG.
  • the deframer 1221 exemplarily demaps the UL data and control information mapped to the UL reception frame (exemplarily LTE subframe) input from the radio unit 121.
  • the data processing unit 1222 illustratively demodulates and decodes the UL data demapped by the deframer 1221 to obtain received data.
  • the UL message detection unit 1223 illustratively detects a UL message transmitted by the UE 11.
  • An example of the UL message is the “SR + BSR” message described above.
  • the UL message detection unit 1223 detects the code number from the reception orthogonal sequence representing the “SR + BSR” message as described above with reference to FIGS.
  • the UL message detection unit 1223 includes the reception processing unit 70 illustrated in FIG. However, one or both of the replica generation unit 731 and the sequence ID combination detection unit 74 illustrated in FIG. 8 may be included in the control unit 124.
  • the transmission baseband processing unit 123 illustratively encodes and modulates DL transmission data and DL control information and outputs the encoded data to the radio unit 121.
  • the DL control information may include, for example, the above-described UL-Grant and the code number versus data size information 100 illustrated in FIG.
  • the code number versus data size information 100 may be stored in a storage unit 1242 described later of the control unit 124.
  • the transmission baseband processing unit 123 is an example of a transmission unit (or notification unit) that transmits (or notifies) the code number versus data size information 100 to the UE 11. .
  • the controller 124 illustratively controls the operation and processing of the eNB 12.
  • the control unit 124 may control DL transmission processing and UL reception processing in the eNB 12.
  • the control unit 124 may include a scheduler 1241 and a storage unit 1242.
  • the scheduler 1241 exemplarily schedules resources used for one or both of DL and UL communication with the UE 11. For example, when the sequence ID is detected by the UL message detection unit 1223, the scheduler 1241 may schedule resources for UL communication according to the data size corresponding to the sequence ID.
  • the scheduler 1241 may give UL-Grant including resource allocation information as a scheduling result to the transmission baseband processing unit 123.
  • UL-Grant is transmitted from the transmission baseband processing unit 123 to the UE 11 through the radio unit 121 and the antenna 120.
  • the storage unit 1242 exemplarily stores various information such as system information and control information used for DL transmission processing and UL reception processing.
  • the system information may illustratively include the above-mentioned MIB and SIB.
  • the storage unit 1242 information on the replica generated by the replica generation unit 731 in the delay profile generation unit 73 illustrated in FIGS. 7 and 8, thresholds (Th and Th1) regarding the above-described determination index values, and the example illustrated in FIG. Code number versus data size information 100 or the like may be stored.
  • a semiconductor memory such as a RAM or a ROM may be applied to the storage unit 1242, and the ROM may be a flash memory.
  • control unit 124 for example, a CPU may be used, or an IC such as an MPU or a DSP may be used alternatively or additionally.
  • the CPU, the MPU, the DSP, and the like are examples of a processor circuit or a processor device having a calculation capability, and may be referred to as “computer” for convenience.
  • processing units 122 and 123 and the control unit 124 may be realized by a “computer” such as a CPU, MPU, or DSP, or a program such as an FPGA including the “computer”. It may be realized using a possible logical device.
  • a code number may be randomly selected according to the generation of transmission data. Even in this case, the SR resource standby time can be reduced, so that the delay of UL communication can be reduced.
  • wireless communication system 11 wireless terminal (UE) DESCRIPTION OF SYMBOLS 110 Antenna 111 Radio

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Abstract

L'invention concerne une station de transmission sans fil (11) pouvant générer et transmettre une pluralité de séquences orthogonales correspondant à un numéro de code choisi parmi une pluralité de numéros de code. Une station de réception sans fil (12) peut recevoir la pluralité de séquences orthogonales, peut estimer le numéro de code sélectionné par la station de transmission sans fil (11) parmi la pluralité de séquences orthogonales, et peut attribuer, pour le numéro de code estimé, une ressource de transmission de données à la station de transmission sans fil (11).
PCT/JP2016/064063 2016-05-11 2016-05-11 Système de communication sans fil, station de transmission sans fil et station de réception sans fil WO2017195306A1 (fr)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010528534A (ja) * 2007-05-18 2010-08-19 クゥアルコム・インコーポレイテッド 無線通信システムにおけるａｃｋ及びｃｑｉのためのパイロット構造
JP2013540394A (ja) * 2010-09-28 2013-10-31 エルジー エレクトロニクス インコーポレイティド 無線通信システムにおける受信確認送信方法及び装置

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Publication number Priority date Publication date Assignee Title
JP2010528534A (ja) * 2007-05-18 2010-08-19 クゥアルコム・インコーポレイテッド 無線通信システムにおけるａｃｋ及びｃｑｉのためのパイロット構造
JP2013540394A (ja) * 2010-09-28 2013-10-31 エルジー エレクトロニクス インコーポレイティド 無線通信システムにおける受信確認送信方法及び装置

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Title
INSTITUTE FOR INFORMATION INDUSTRY (III): "Combined SR with BSR for reducing UP latency", 3GPP TSG-RAN WG2#91BIS, R2-154411, 5 October 2015 (2015-10-05), XP051004982, Retrieved from the Internet <URL:http://www.3gpp.org/ftp/tsg_ran/WG2_RL2/TSGR2_91bis/Docs/R2-154411.zip> *

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