WO2013172106A1 - Station de base dans un système de communication mobile et procédé de commande - Google Patents

Station de base dans un système de communication mobile et procédé de commande Download PDF

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Publication number
WO2013172106A1
WO2013172106A1 PCT/JP2013/059868 JP2013059868W WO2013172106A1 WO 2013172106 A1 WO2013172106 A1 WO 2013172106A1 JP 2013059868 W JP2013059868 W JP 2013059868W WO 2013172106 A1 WO2013172106 A1 WO 2013172106A1
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Prior art keywords
bundling
base station
index
communication
period
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PCT/JP2013/059868
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English (en)
Japanese (ja)
Inventor
義顕 大藤
耕平 清嶋
尚人 大久保
理香 鬼頭
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株式会社 エヌ・ティ・ティ・ドコモ
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Publication of WO2013172106A1 publication Critical patent/WO2013172106A1/fr

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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
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria

Definitions

  • the present invention relates to a base station and a control method in a mobile communication system.
  • Frequency scheduling includes dynamic scheduling and semi-persistent scheduling (SPS).
  • SPS semi-persistent scheduling
  • radio resources are dynamically allocated to users according to the priority according to the data type and the quality of the radio channel state. For example, which radio resource is allocated to which user is determined for each subframe or unit transmission period (TTI) of 1 ms, for example. Since how to allocate radio resources to users changes frequently, radio resources can be used flexibly.
  • the user apparatus when data to be transmitted by the user apparatus occurs, the user apparatus first transmits a scheduling request (SR) to the base station.
  • SR scheduling request
  • the base station performs scheduling only after receiving the SR, and notifies the user apparatus of signaling for instructing data transmission based on the result. Therefore, the delay from the occurrence of uplink data to the actual transmission tends to be large.
  • the semi-persistent scheduling method is a method that can cope with such concerns.
  • one radio resource allocation is applied not only to one subframe but also to many subsequent subframes. That is, by periodically allocating a certain radio resource, overhead required for radio resource signaling is reduced. Therefore, if all user apparatuses in the mobile communication system support SPS, the above-mentioned concerns can be solved by using SPS for voice data. Further, since radio resources are periodically allocated, it is not necessary to transmit the SR every time data is generated as in dynamic scheduling, and the delay can be shortened.
  • the semi-persistent scheduling method is not essential according to the 3GPP rules, the user equipment in the mobile communication system does not always support SPS. Therefore, it is expected that user devices that are compatible with SPS and user devices that are not compatible with each other are expected to coexist. In this case, it is eventually necessary to perform radio resource allocation by a dynamic scheduling method. Then, the radio resource must be specified for each piece of audio data with a small amount of data generated periodically, and there is a concern again about the above problem that the overhead becomes large.
  • SPS semi-persistent scheduling method
  • One technique for increasing the capacity is the delay packing method.
  • An object of the present invention is to provide an overhead amount to be added to a packet in a lower layer and a higher order when data for one cycle of periodically generated data is transmitted and received by a wireless communication device as a plurality of packets over a plurality of unit transmission periods. It is to be able to reduce both processing burdens in the layer.
  • a base station that wirelessly communicates with user equipment, A quality information acquisition unit for acquiring quality information indicating a radio channel state of the user apparatus; Quality information, radio resource allocation period, bundling information indicating whether bundling communication is transmitted as a plurality of packets in which data for one period of periodically generated data is continuous, and the bundling communication
  • a storage unit that stores a correspondence relationship with radio resources that can be used according to the necessity of each of the indexes of the plurality of parameter sets; By referring to the correspondence relationship, an index corresponding to the quality information acquired by the quality information acquisition unit is determined, the necessity of bundling communication indicated by the bundling information corresponding to the determined index, and the base station If the necessity of bundling communication currently set in the case does not match, a control unit that prohibits switching of the necessity of bundling communication for a certain period, A scheduling unit that allocates radio resources corresponding to an index of the determined parameter set to a user apparatus in an allocation period corresponding to the index; And a communication
  • control method includes: A control method executed by a base station that wirelessly communicates with a user apparatus, Obtaining quality information indicating a radio channel state of the user equipment; Quality information, radio resource allocation period, bundling information indicating whether bundling communication is transmitted as a plurality of packets in which data for one period of periodically generated data is continuous, and the bundling communication Corresponding to the quality information acquired in the acquiring step by referring to a table in which the correspondence relationship with the radio resources that can be used according to necessity is determined according to each of the indexes of the plurality of parameter sets When the index is determined and the necessity of bundling communication indicated by the bundling information corresponding to the determined index does not match the necessity of bundling communication currently set in the base station, A step of prohibiting switching of the necessity of ring communication for a certain period of time; A radio resource corresponding to an index of the determined parameter set is allocated to a user apparatus at an allocation period corresponding to the index, and the control method includes a
  • the wireless communication apparatus when data for one cycle of periodically generated data is transmitted / received by the wireless communication apparatus as a plurality of packets over a plurality of unit transmission periods, the amount of overhead added to the packet in the lower layer and the upper layer It is possible to reduce both processing loads on the layer.
  • segmented by a segmentation system and a some packet is produced.
  • the figure which shows a mode that several packets are produced by a TTI bundling system.
  • the number of resource blocks used for communication and the received power density tend to be inversely proportional ( Figure 1). Therefore, when a large number of resource blocks are used while satisfying the required quality, it is necessary to increase the transmission power. However, there is an upper limit to the power that can be transmitted by the wireless communication device, and it cannot be exceeded. In particular, in the case of a user apparatus, the transmission power is limited to be smaller than that of a base station or the like. From this point of view, it is necessary to reduce the number of resource blocks used for communication in the uplink as much as possible to ensure the required quality. When the power density is increased by reducing the number of resource blocks as much as possible, the power of the desired signal becomes larger than the noise power, which is preferable from the viewpoint of improving the signal quality.
  • MCS Modulation and Coding Scheme
  • the user equipment that tends to deteriorate the communication environment such as the vicinity of the cell edge must use a small low MCS and can communicate only a little information at a time, while maintaining the required quality. It may not be possible to transmit all the data for the period in one subframe at a time. In order to deal with such an inconvenience, it is conceivable that data for one period is communicated with a plurality of packets over a plurality of continuous or discontinuous unit transmission periods TTI by a segmentation method or a TTI bundling method.
  • the segmentation method divides the information bits S constituting the data into a plurality of pieces, and creates a plurality of packets by adding redundant bits to the divided information bits.
  • a header, a cyclic redundancy check code (CRC), etc. are attached to each of the plurality of packets.
  • Scheduling is performed for each of the plurality of packets, and the base station eNB transmits a control signal PDCCH indicating the contents of radio resource allocation to the user apparatus UE, and the user apparatus UE transmits a packet (PUSCH) accordingly.
  • FIG. 3 shows signal exchange between the base station eNB and the user apparatus UE in the segmentation method.
  • the control signal transmitted by the base station eNB is not necessarily PDCCH, and may be PHICH indicating ACK or NACK, or both PDCCH and PHICH.
  • the TTI bundling method creates multiple packets by generating redundant versions of the data without dividing the data. Since multiple packets are always transmitted continuously, only one header and CRC is set for every four packets.
  • FIG. 5 shows signal exchange between the base station eNB and the user apparatus UE in the TTI bundling method. Unlike the segmentation formula, scheduling is not performed for each of the four packets, but only once for every four packets.
  • the control signal PDCCH indicating the radio resource allocation content is transmitted from the base station eNB to the user apparatus UE, the user apparatus UE continuously transmits four packets (PUSCH) accordingly.
  • the TTI bundling method is described in Non-Patent Document 2, for example.
  • Fig. 6A shows the layers related to the control plane (C-plane).
  • NAS Non-Access Stratum
  • MME Mobility Management Entity: MME
  • RRC Radio Resource Control
  • processing related to call connection and disconnection, Hand Over (HO), and the like is performed.
  • the present application pays particular attention to the control related to TTI bundling. Specifically, whether or not to use the TTI bundling method (ON / OFF) is controlled in the RRC layer. ON / OFF of TTI bundling is notified by RRC message (RRC Connection Reconfiguration).
  • PDCP Packet Data Convergence Protocol
  • RLC Radio Link Control
  • RLC Radio Link Control
  • the segmentation method is a process of dividing data as described above.
  • the concatenation method is a process for concatenating data.
  • MAC MAC layer of the L2 layer
  • processing such as multiplexing, retransmission control (HARQ), priority control, and scheduling is performed.
  • HARQ retransmission control
  • PHY physical layer
  • wireless communication wireless communication is performed.
  • FIG. 6B shows layers related to the user data plane (U-plane).
  • the functions of PDCP, RLC, MAC, and PHY are the same as those described for the control plane (C-plane) in FIG. 6A.
  • the application layer exchange between the user apparatus UE and a communication partner (not shown) is performed.
  • IP Internet protocol
  • exchange between the user apparatus UE and the core network is performed.
  • the RRC layer processing is performed in the C-plane, whereas the RRC layer processing is not performed in the U-plane.
  • Whether or not to perform the segmentation method is controlled by the R2 layer RLC layer, which is preferable in that it can be switched with low delay.
  • each divided packet requires a header and CRC, which increases overhead and causes a division loss.
  • it is necessary to perform scheduling independently for each of the plurality of divided packets and the amount of control signal (signaling amount) also increases.
  • the TTI bundling method is preferable in that scheduling can be performed for a plurality of packets collectively, and overhead such as a header can be reduced.
  • switching of the necessity of TTI bundling is processed in the RRC layer, it is not easy to switch quickly with low delay.
  • both the amount of overhead added to the packet in the lower layer and the processing burden in the upper layer when the data for one cycle of the periodically generated data is transmitted / received by the wireless communication device as a plurality of packets over a plurality of TTIs It is desirable to be able to reduce this.
  • the base station eNB identifies an index corresponding to the quality information CQI of the user apparatus UE by referring to the table, and in principle, the necessity of the TTI bundling scheme corresponding to the index To communicate according to
  • changing the necessity of TTI bundling is prohibited if a certain period has not elapsed since the necessity of TTI bundling was changed.
  • the base station eNB maintains the signal quality by performing segmentation.
  • FIG. 7 shows a functional block diagram of a base station used in the embodiment of the present invention.
  • FIG. 7 shows a processing unit particularly related to the present embodiment among the processing units that realize various functions provided in the base station of the mobile communication system.
  • the illustrated base station is, for example, a base station in a long-term evolution (LTE) mobile communication system, but may be a base station in another mobile communication system.
  • the base station may be a base station of a mobile communication system such as LTE advanced system.
  • LTE long-term evolution
  • FIG. 7 shows an uplink signal reception unit 701, a quality information acquisition unit 703, an uplink / downlink (UL / DL) buffer management unit 705, a storage unit 707, a communication method determination unit 709, a parameter selection unit 711, and a scheduling unit 713.
  • a TFR selection unit 715, a downlink signal generation unit 717, and a downlink signal transmission unit 719 are shown.
  • the uplink signal receiving unit 701 receives an uplink signal from the user apparatus UE and converts it into a baseband signal. Therefore, uplink signal receiving section 701 has a function of filtering the received radio signal, a function of converting an analog signal into a digital signal, a function of demodulating the received signal, a function of channel decoding the received signal, and the like.
  • the uplink signal generally includes a control channel, a pilot channel, a data channel, and the like.
  • the uplink signal includes period data in which data is generated at a constant period, such as audio data. This audio data is received by the radio resource allocated according to the allocation cycle determined by the process described later.
  • the user apparatus UE may be any appropriate communication apparatus that communicates with a base station through a radio link, and may be a mobile terminal or a fixed terminal.
  • the user device UE is a mobile phone, a user device, an information terminal, a high-performance mobile phone, a smartphone, a tablet computer, a personal digital assistant (PDA), a portable personal computer, a palmtop computer, a laptop computer, Although it is a desktop computer etc., it is not limited to these.
  • the quality information acquisition unit 703 acquires quality information or a quality value indicating the quality of the radio channel state from the uplink signal.
  • Quality information is included in the control channel.
  • the quality information may be information indicating a downlink radio channel state, information indicating an uplink radio channel state, or information including both of them.
  • the downlink radio channel state may be expressed, for example, by a channel state indicator (CQI) derived from the reception level of the pilot signal received by the user apparatus.
  • the uplink radio channel state may be derived from the reception level of the pilot signal received by the base station.
  • the reception level of the pilot signal received by the base station and the user apparatus may be expressed by any appropriate amount known to those skilled in the art.
  • the reception level is broadly defined as an amount representing the quality of the radio channel state regardless of whether it is an instantaneous value or an average value.
  • the reception field strength RSSI, the desired wave reception power RSRP, the reception quality May be represented by RSRQ, path loss, SNR, SIR, SINR, Ec / N 0 or the like.
  • the desired wave in RSRP, RSRQ, SNR, SIR, SINR, etc. may be, for example, the power of a shared data channel (PUSCH, PDSCH) or a pilot signal (sounding reference signal (SRS) and / or demodulation reference signal (DMRS)
  • PUSCH, PDSCH shared data channel
  • SRS sounding reference signal
  • DMRS demodulation reference signal
  • the uplink / downlink (UL / DL) buffer management unit 705 manages the buffer state (data retention amount) of data transmitted in the uplink and downlink.
  • the buffer state (data retention amount) of data transmitted in the downlink is determined by examining the state of a transmission buffer (not shown) provided in the base station.
  • the buffer status (data retention amount) of data transmitted in the uplink is found by receiving a buffer status report BSR indicating the status of the transmission buffer provided in the user apparatus UE from the user apparatus. To do.
  • the radio resource is allocated to the user apparatus, the data retention amount managed by the base station is updated so as to decrease by the allocated size.
  • the storage unit 707 stores various parameters corresponding to each of a plurality of options of allocation periods for assigning radio resources to periodically generated period data. These parameters may be stored as a table. Each of the multiple options is referred to as a delay packing index (DPI) or simply an index.
  • DPI delay packing index
  • the table stored in the storage unit 707 is transmitted as a plurality of packets in which DPI, radio resource allocation period, quality information, and TTI bundling flag (data corresponding to one period of periodically generated data are continuous). Information indicating whether or not TTI bundling is necessary), the transport block size TBS, and the correspondence between radio resources that can be used depending on whether or not TTI bundling is necessary.
  • FIG. 8 shows an example of such a table.
  • the radio resource allocation cycle T 0 -T 3 is a cycle in which radio resources are allocated to periodically generated data. Note that since the delay packing method is used, this allocation period does not necessarily coincide with the data generation period.
  • the radio resource allocation period is set longer as the radio channel state is better and shorter as the radio channel state is worse. Although not essential, the allocation period is longer as the index is smaller, and is shorter as the index is larger. However, it is not essential that the four allocation periods shown in the figure are all different. For example, T 0 and T 1 may be equal. Therefore, in general, T 0 ⁇ T 1 ⁇ T 2 ⁇ T 3 .
  • TTI bundling flags FlagI 0 to FlagI 3 indicate whether or not TTI bundling is necessary.
  • TTI bundling is not required when the radio channel condition is good and is set as necessary when the radio channel condition is bad. Therefore, as an example, a value indicating that TTI bundling is not required for FlagI 0 , FlagI 1 and FlagI 2 (for example, False or 0) is set, and a value indicating that TTI bundling is required for FlagI 3 ( For example, True or 1) may be set.
  • a value indicating that TTI bundling is not required for FlagI 0 and FlagI 1 (for example, False or 0) is set, and a value indicating that TTI bundling is required for FlagI 2 and FlagI 3 (for example, True Or 1) may be set.
  • a value indicating that TTI bundling is not required for FlagI 0 (for example, False or 0) is set, and a value indicating that TTI bundling is required for FlagI 1 , FlagI 2, and FlagI 3 (for example, True Or 1) may be set.
  • Truth and 1/0 may be reversed.
  • the column of quality information in the table indicates how to classify the quality information or quality value acquired by the quality information acquisition unit 703 (FIG. 7).
  • the quality information is expressed in SIR, but as described above, the quality information may be expressed in an amount other than SIR.
  • the quality information indicates a better value as the index is smaller, and indicates a worse value as the index is larger, but this is not essential.
  • “rise” and “fall” are for providing hysteresis between the quality information and the index. For example, when the SIR changes from a value smaller than Y1 UP to a larger value, the index changes from 2 to 1 (changes in the direction of increasing quality).
  • Transport block size TBS 0 -TBS 3 represents the data size that can be transmitted or received at one time.
  • the transport block size is set to be larger as the radio channel state is better and smaller as it is worse.
  • the transport block size indicates a larger value as the index is smaller, and indicates a smaller value as the index is larger. More generally, TBS 0 ⁇ TBS 1 ⁇ TBS 2 ⁇ TBS 3 .
  • the number of resource blocks that can be allocated at one time and the transmission formats that can be used are defined separately for cases where TTI bundling is performed and cases where it is not performed.
  • the number of resource blocks is set to be larger as the radio channel state is better and smaller as it is worse. Therefore, in the case of the illustrated example, the number of resource blocks is larger as the index is smaller, and is smaller as the index is larger. More generally, NRB 10 ⁇ NRB 11 ⁇ NRB 12 ⁇ NRB 13 FlagP indicates whether or not the base station is currently performing TTI bundling. In the example shown in the figure, when TTI bundling is performed, it is set to True or 1, and TTI bundling is not performed.
  • FlagP and the above FlagI i are flags relating to the necessity of TTI bundling.
  • FlagP i indicates the current state of the base station, whereas FlagI i performs TTI bundling when the index is i. The meaning of both is different in that it indicates whether or not it should be.
  • the transmission format is set to a larger MCS as the radio channel state is better, and is set to a smaller MCS as the radio channel state is worse.
  • the transmission format TF indicates a large value (large MCS) as the index is small, and a small value (small MCS) as the index is large. More generally, TF 10 ⁇ TF 11 ⁇ TF 12 ⁇ TF 13 .
  • the number of resource blocks is larger as the index is smaller, and is smaller as the index is larger. More generally, NRB 00 ⁇ NRB 01 ⁇ NRB 02 ⁇ NRB 03 .
  • a transmission format TF (that is, MCS) that is a combination is shown.
  • the transmission format TF indicates a larger value (large MCS) as the index is smaller, and a smaller value (small MCS) as the index is larger. More generally, TF 00 ⁇ TF 01 ⁇ TF 02 ⁇ TF 03 .
  • TTI bundling 1
  • NRB 10 -NRB 13 the number of resource blocks at a time in the assignable number of resource blocks at a time in the case of not performing TTI bundling
  • NRB 00 -NRB 03 the number of resource blocks at a time in the case of not performing TTI bundling
  • the communication method determination unit 709 in FIG. 7 determines an index (DPI) corresponding to the quality information acquired by the quality information acquisition unit 703 by referring to a table as illustrated in FIG. Although the detailed operation will be described later, the communication method determination unit 709 determines whether TTI bundling is necessary (FlagI i ) indicated by the TTI bundling flag corresponding to the determined index, and the base station currently performs TTI bundling. Check whether it is supposed to be (FlagP). If they match, the TTI bundling is continued or not performed without changing the necessity of TTI bundling.
  • DPI an index
  • the communication method determination unit 709 determines whether TTI bundling is necessary (FlagI i ) indicated by the TTI bundling flag corresponding to the determined index, and the base station currently performs TTI bundling. Check whether it is supposed to be (FlagP). If they match, the TTI bundling is continued or not performed without changing the necessity of TTI bundling.
  • the communication method determination unit 709 determines whether or not a certain period has elapsed since the current state transition between the state where the TTI bundling is performed and the state where the TTI bundling is not performed. When the predetermined period has elapsed, the communication method determination unit 709 changes FlagP to the content indicated by FlagI i . If the predetermined period has not elapsed, the communication method determination unit 709 prohibits or suppresses the state transition on whether to perform TTI bundling, maintains FlagP as it is, and does not change to FlagI i .
  • the communication method determination unit 709 determines to perform segmentation on periodically generated data. In this way, the communication method determination unit 709 determines whether or not the communication method to be performed by the base station is to perform TTI bundling and whether to perform segmentation.
  • the value of the predetermined period T prohibit measured by the communication method determination unit 709 may be arbitrarily determined.
  • the predetermined period T prohibit may be set equal to a natural number times the generation period of periodically generated data.
  • the fixed period T prohibit is A value that is larger than the period measured by the timer and closest to the period may be used.
  • the period 50 ms measured by the timer is not a natural number multiple (20 ms, 40 ms, 60 ms, etc.) of the data generation cycle.
  • the predetermined period T prohibit is set to a value 60 ms that is larger than the period 50 ms measured by the timer and is closest to that period within a natural number multiple of the generation period (20 ms, 40 ms, 60 ms, etc.).
  • the parameter selection unit 711 determines to use various parameters corresponding to the index determined by the communication method determination unit 709. Specifically, the radio resource allocation period, whether to perform TTI bundling, the number of available resource blocks, the transmission format, whether to perform segmentation, and the like are specified.
  • the scheduling unit 713 calculates a scheduling coefficient for a user (user device) in which data to be communicated exists. Scheduling section 713 assigns radio resources preferentially to users whose scheduling coefficient values are relatively large (or that are determined to have a high priority in a hard decision).
  • the scheduling factor may be calculated by any suitable method. As an example, the scheduling coefficient may be calculated by a MaxC / I method, a proportional fairness method, or the like. Further, any parameter that determines the priority of the user apparatus is not limited to the scheduling coefficient.
  • a TFR (Transport Format and Resource) selection unit 715 determines a transmission format (data modulation scheme and channel coding rate) and resource block according to an instruction from the scheduling unit 713 for a user apparatus to which a radio resource is allocated.
  • the downlink signal generation unit 717 generates a downlink signal including a control channel and a shared data channel.
  • the control channel indicates how radio resources are allocated to the user equipment.
  • this control channel corresponds to a physical downlink control channel (PDCCH).
  • the control channel includes information such as identifiers of users to which radio resources are allocated, resource blocks allocated in the downlink and / or uplink, and data formats (data modulation scheme and channel coding rate).
  • the shared data channel includes user data, and generally includes voice data (VoIP), real-time data, data for data communication, and the like.
  • this data channel corresponds to a physical downlink shared channel (PDSCH).
  • PDSCH physical downlink shared channel
  • the downlink signal transmission unit 719 transmits the downlink signal generated by the downlink signal generation unit 717. Therefore, the downlink signal transmission unit 719 has a function of channel-coding transmission data, a function of data modulation of transmission data, a function of converting a digital signal into an analog signal, a function of filtering a transmission signal, and a transmission signal. Has a function to amplify.
  • the user apparatus that has received the downlink signal analyzes a control signal (PDCCH) indicating whether or not a radio resource is allocated. If the radio resource is allocated, the user apparatus transmits the uplink signal using the designated radio resource.
  • PDCH control signal
  • FIG. 9 shows a flowchart of an operation example performed by the base station (particularly, the communication method determination unit 709) as shown in FIG.
  • the illustrated flow is periodically performed for each user apparatus scheduled by the delay packing method.
  • Such a cycle is a natural number multiple of the generation cycle of data communicated by the user apparatus.
  • the base station periodically updates the index to be used and the necessity of TTI bundling by periodically performing the illustrated flow.
  • the cycle for performing the flow may be an update cycle longer than the allocation cycle in delay packing.
  • the flow begins at step 901 and proceeds to step 903.
  • the base station acquires quality information (for example, SIR) of the user apparatus and refers to a table (FIG. 8) to determine an index DPI corresponding to the quality information.
  • quality information for example, SIR
  • FIG. 8 For convenience of explanation, it is assumed that the number indicating the index DPI is 0, 1, 2, or 3.
  • step 905 the base station determines the difference between the index i old determined in the previous cycle and the index i determined in the current cycle. If they are different, the flow proceeds to step 907.
  • step 907 the base station updates the index value used in this cycle. That is, i old is set to the value of i.
  • the parameter used in the current cycle for the user apparatus is changed from the line with the index i old to the parameter shown in the line i.
  • changing the index to be used is processing in the L2 layer, and can be performed quickly.
  • changing whether to perform TTI bundling (FlagP) is controlled in the RRC layer, so it is not easy to do it quickly.
  • step 909 the base station determines the flag FlagP value indicating whether or not the base station is currently performing TTI bundling (this flag is determined in the previous cycle) and the index i used this time. Whether the value of the TTI bundling flag FlagI i corresponding to is different is determined. If the value of FlagP and the value of FlagI i are different, the flow proceeds to step 911. As described above, both FlagP and FlagI i are flags related to the necessity of TTI bundling. FlagP i indicates the current state of the base station, whereas FlagI i has an index i. Note that they differ in that they indicate whether or not TTI bundling should be performed.
  • step 911 the base station determines whether or not a certain period of time T prohibit or more has elapsed after the previous change of whether or not to perform TTI bundling. If the predetermined period T prohibit or more has elapsed, the flow proceeds to step 913.
  • step 913 the base station changes the value FlagP indicating whether or not to perform TTI bundling in this cycle to the value FlagI i indicated by the TTI bundling flag corresponding to the index i.
  • the parameter to be used for the user apparatus UE is uniquely determined by the changed index i and the changed FlagP.
  • step 911 If, in step 911, the state of whether or not to perform TTI bundling has been changed last time, and the predetermined period T prohibit or more has not elapsed, the flow proceeds to step 915.
  • step 915 the base station performs segmentation.
  • FlagP is not changed, and TTI bundling is performed not only last time but also this time.
  • step 923 If the value of FlagP and the value of FlagI are the same in step 909, the flow proceeds to step 923.
  • the base station determines various parameters to be used this time based on the current index DPI, FlagP indicating whether to perform TTI bundling, and whether to perform segmentation. As shown in FIG. 8, by specifying the value i of the index DPI and the value FlagP indicating whether or not to perform TTI bundling, a parameter necessary for communication can be uniquely specified. Such parameters include the available transport block size, the number of available resource blocks and the transmission format. Thereafter, the flow proceeds to step 927, and the procedure for determining the communication method ends.
  • step 905 if the index i old determined in the previous cycle and the index i determined in the current cycle are the same, the flow proceeds to step 917.
  • step 917 the base station sets the value of the flag FlagP indicating whether or not the base station is currently performing TTI bundling (this flag is determined in the previous cycle) and the index used this time. The difference between the value of the corresponding TTI bundling flag FlagI is determined. If the value of FlagP and the value of FlagI are different, the flow proceeds to step 919.
  • step 919 the base station determines whether or not a certain period of time T prohibit or more has elapsed since the previous change of whether or not to perform TTI bundling. If the predetermined period T prohibit or more has elapsed, the flow proceeds to step 921.
  • step 921 the base station changes the value (FlagP) indicating whether or not to perform TTI bundling in this cycle to the value (FlagI) indicated by the TTI bundling flag corresponding to the index.
  • the parameter to be used for the user apparatus UE is uniquely determined by the index i that has been the same and the changed FlagP.
  • step 919 If, in step 919, the state of whether or not to perform TTI bundling has been changed last time, and the predetermined period T prohibit or more has not elapsed, the flow proceeds to step 925.
  • the parameter to be used for the user apparatus UE is uniquely determined by the index i that is the same and FlagP that is not changed.
  • the state cannot be changed to perform TTI bundling, but the radio channel state is so bad that TTI bundling is required.
  • step 925 the base station performs segmentation.
  • FlagP is not changed, and TTI bundling is performed not only last time but also this time.
  • step 921 the flow proceeds to steps 923 and 927 and ends.
  • step 925 the flow proceeds to step 927 and ends.
  • the specific examples of (1)-(6) below are the cases where the necessity of DPI and TTI bundling for this time and this time are different (1) and (2), but the DPI for this time and this time are different but TTI bundling.
  • the same DPI and TTI bundling as before (3), and the previous and current DPI are the same but the TTI bundling is different (4) and (5). (6) is shown when the necessity of is the same.
  • the base station periodically executes the flow shown in FIG. 9 for each user apparatus, whereby the parameter value to be used for communication of each user apparatus is determined. Thereafter, the base station (in particular, the scheduling unit 713 in FIG. 7) performs scheduling for actually allocating radio resources to the user apparatus.
  • FIG. 10 shows an outline of an operation when performing scheduling. The flow starts from step S101 and proceeds to step S103.
  • step S103 the base station initializes a parameter k for designating a user for which a bearer is set to 1.
  • step S105 the base station determines whether or not the kth user apparatus UE # k is a scheduling target. If the kth user apparatus UE # k is not the target of scheduling, the flow proceeds to step S111. If the kth user apparatus UE # k is the target of scheduling, the flow proceeds to step S107.
  • step S107 the base station determines whether to allocate radio resources to the kth user apparatus UE # k among the user apparatuses subjected to scheduling.
  • a radio resource is allocated to a user apparatus having a relatively large scheduling coefficient value (or a hard decision that is determined to have a high priority).
  • a transmission format (MCS), a resource block, a transport block size, and the like are determined for the user apparatus UE # k that is determined to be assigned a radio resource.
  • MCS transmission format
  • the number of resource blocks, transport block size, and the like for periodic data such as audio data are determined by the flow of FIG.
  • step S111 the value of parameter k is incremented.
  • step S113 it is determined whether or not the value of the parameter k is equal to or less than the number K of all user apparatuses that have set bearers. If the value of the parameter k is equal to or smaller than K, the flow returns to step S105, and the already described processing is performed for the incremented kth user device. When the value of the parameter k becomes larger than K, the flow proceeds to step S115, and the radio resource allocation process for the current subframe is completed.
  • the base station after whether the state performing TTI bundling last change, determines whether or not the elapse of a predetermined period of time T prohibit or more, has elapsed a period of time T prohibit or If not, state transition is prohibited.
  • FIG. 11 schematically shows a state in which the necessity of TTI bundling is changed according to signal quality without provision of such a certain period of time.
  • TTI bundling since whether or not to perform TTI bundling is controlled in the RRC layer, it is not easy to switch frequently and quickly.
  • FIG. 12 shows a case where a certain period for prohibiting the state transition of whether or not to perform TTI bundling is provided according to the present embodiment.
  • TTI bundling is set to OFF.
  • TTI bundling accordingly is switched from OFF (not required) to ON (required). In response to this switching, measurement for a certain period during which further switching is prohibited is started.
  • Predetermined period is expired at time t 2, TTI bundling for quality is still less than the threshold value of the signal remains is ON.
  • the signal quality becomes equal to or higher than the threshold value, and TTI bundling is switched from ON to OFF accordingly.
  • measurement for a certain period during which further switching is prohibited is started.
  • TTI bundling cannot be turned ON from OFF even if the signal quality falls below the threshold. In this case, segmentation is performed and communication quality is maintained.
  • TTI bundling is switched from OFF to ON at time t 4. In response to this switching, measurement for a certain period during which further switching is prohibited is started.
  • Predetermined period is expired at time t 5, TTI bundling for quality is still less than the threshold value of the signal remains is ON.
  • TTI bundling is switched from ON to OFF in response thereto. In response to this switching, measurement for a certain period during which further switching is prohibited is started.
  • Predetermined period is expired at time t 7, TTI bundling for quality is still above the threshold signal remains OFF.
  • TTI bundling in accordance with this is switched ON from OFF. In response to this switching, measurement for a certain period during which further switching is prohibited is started.
  • Predetermined period is expired at time t 9, TTI bundling for quality is still less than the threshold value of the signal remains is ON. Thereafter, similar processing continues.
  • FIG. 13 is a flowchart showing such a modification. The flow begins at step 1301 and proceeds to step 1303.
  • the base station acquires quality information (for example, SIR) of the user apparatus and refers to a table (FIG. 8) to determine an index DPI corresponding to the quality information.
  • quality information for example, SIR
  • FIG. 8 For convenience of explanation, it is assumed that the number indicating the index DPI is 0, 1, 2, or 3.
  • step 1305 the base station determines the difference between the index i old determined in the previous cycle and the index i determined in the current cycle. If they are different, the flow proceeds to step 1307.
  • step 1307 the base station updates the index value used in this cycle. That is, i old is set to the value of i.
  • the parameter used in the current cycle for the user apparatus is changed from the line with the index i old to the parameter shown in the line i.
  • step 1309 the base station sets the flag FlagP value indicating whether or not the base station is currently performing TTI bundling (this flag is determined in the previous cycle) and the index used this time. The difference between the value of the corresponding TTI bundling flag FlagI i is determined. If the value of FlagP and the value of FlagI i are different, the flow proceeds to step 1311.
  • step 1311 the base station determines whether or not a certain period of time T prohibit or more has elapsed since the previous change of whether or not to perform TTI bundling. If the predetermined period T prohibit or more has elapsed, the flow proceeds to step 1313.
  • the base station changes the value FlagP indicating whether or not to perform TTI bundling in this cycle to the value FlagI i indicated by the TTI bundling flag corresponding to the index.
  • the parameter to be used for the user apparatus UE is uniquely determined by the determined index i and FlagP that has not been changed.
  • step 1311 If, in step 1311, the state of whether or not to perform TTI bundling has been changed last time, and the predetermined period T prohibit or more has not elapsed, the flow proceeds to step 1315.
  • the parameter to be used for the user apparatus UE is uniquely determined by the determined index i and the unchanged FlagP.
  • the state cannot be changed to perform TTI bundling, but it is necessary to transmit packets over a plurality of TTIs to improve communication quality.
  • step 1315 the base station performs segmentation.
  • FlagP False or 0
  • step 1309 If the value of FlagP and the value of FlagI are the same in step 1309, the flow proceeds to step 1317.
  • Step 1317 the base station determines various parameters to be used this time based on whether or not to perform the current index DPI, TTI bundling, FlagP, and segmentation. As shown in FIG. 8, by specifying the index DPI and whether or not to perform TTI bundling (FlagP), a parameter necessary for communication can be uniquely specified. Such parameters include the available transport block size, the number of available resource blocks and the transmission format. Thereafter, the flow proceeds to step 1319, and the procedure for determining the communication method ends.
  • the present invention is not limited to the above embodiments, and various modifications and improvements can be made within the scope of the present invention.
  • the present invention may be applied to any appropriate mobile communication system that performs TTI bundling.
  • specific numerical examples have been described in order to facilitate understanding of the invention, these numerical values are merely examples and any appropriate values may be used unless otherwise specified.
  • the classification of items in the above description is not essential to the present invention, and the items described in two or more items may be used in combination as necessary, or the items described in one item may be used in different items. It may apply to the matters described in (as long as there is no conflict).
  • the boundaries between functional units or processing units in the functional block diagram do not necessarily correspond to physical component boundaries.
  • the operations of a plurality of functional units may be physically performed by one component, or the operations of one functional unit may be physically performed by a plurality of components.
  • the communication terminal and the information processing apparatus have been described using functional block diagrams. However, such an apparatus may be realized by hardware, software, or a combination thereof.
  • Software that operates in accordance with the present invention includes random access memory (RAM), flash memory, read only memory (ROM), EPROM, EEPROM, registers, hard disk (HDD), removable disk, CD-ROM, database, server and other suitable It may be stored in any storage medium.
  • Uplink signal reception unit 703 Quality information acquisition unit 705 Uplink / downlink (UL / DL) buffer management unit 707 Storage unit 709 Communication system determination unit 711 Parameter selection unit 713 Scheduling unit 715 TFR selection unit 717 Downstream signal generation unit 719 Downlink Signal transmitter

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Une station de base comprend au moins : une unité d'acquisition d'informations de qualité qui acquiert des informations de qualité ; une unité de stockage qui stocke, pour chaque indice d'une pluralité d'ensembles de paramètres, les correspondances entre des informations de qualité, des périodes d'allocation de ressources radio, des informations de groupage indiquant si on doit effectuer ou non un groupage de communications, et des ressources radio qui peuvent être utilisées selon le fait que le groupage de communications doit être effectué ou non ; une unité de commande qui se réfère aux correspondances, déterminant de cette façon un indice correspondant aux informations de qualité courantes et qui, lorsque le fait que le groupage de communications doit être effectué ou non, qui est indiqué par les informations de groupage correspondantes, ne concorde pas avec le fait que les informations de groupage courantes de la station de base doivent être effectuées ou non, interdit, pendant une période de temps donnée, une commutation entre la nécessité d'effectuer le groupage de communications et la non-nécessité d'effectuer le groupage de communications. La station de base effectue une planification au cours d'une période d'allocation déterminée et utilise une ressource radio déterminée pour communiquer avec un équipement utilisateur.
PCT/JP2013/059868 2012-05-18 2013-04-01 Station de base dans un système de communication mobile et procédé de commande WO2013172106A1 (fr)

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CN111212464B (zh) * 2014-03-28 2023-05-12 富士通互联科技有限公司 无线通信***、基站、终端和处理方法
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