WO2010146980A1 - Dispositif de station mobile, dispositif de station de base, système de communication et procédé d'accès aléatoire - Google Patents

Dispositif de station mobile, dispositif de station de base, système de communication et procédé d'accès aléatoire Download PDF

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Publication number
WO2010146980A1
WO2010146980A1 PCT/JP2010/059139 JP2010059139W WO2010146980A1 WO 2010146980 A1 WO2010146980 A1 WO 2010146980A1 JP 2010059139 W JP2010059139 W JP 2010059139W WO 2010146980 A1 WO2010146980 A1 WO 2010146980A1
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random access
base station
station apparatus
mobile station
station device
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PCT/JP2010/059139
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English (en)
Japanese (ja)
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恭之 加藤
昇平 山田
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シャープ株式会社
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access

Definitions

  • the present invention relates to a base station device, a mobile station device, and a communication system, and more particularly to a mobile station device, a base station device, a communication system, and a random access method in operation during random access.
  • the W-CDMA system has been standardized as a third generation cellular mobile communication system, and services have been started sequentially.
  • HSDPA with higher communication speed has also been standardized and the service has started.
  • EUTRA Evolved Universal Terrestrial Radio Access
  • OFDM Orthogonal Frequency Division Multiplexing
  • SC-FDMA Peak-to-Average Power Ratio
  • PAPR Peak-to-average Power to Ratio
  • DFT Discrete Fourier Transform
  • Advanced-EUTRA a further evolution of EUTRA.
  • communication at a maximum transmission rate of 1 Gbps or higher and 500 Mbps or higher of the uplink is performed using a band up to a maximum of 100 MHz bandwidth in the uplink and the downlink, respectively.
  • 3GPP TS (Technical Specification) 36.211, V8.60 (2009-03), Technical Specification Group Radio Access Network, Physical Channel and Modulation (Release 8) 3GPP TS (Technical Specification) 36.212, V8.60 (2009-03), Technical Specification Group Radio Access Network, Multiplexing and channel coding (Release 8) 3GPP TS (Technical Specification) 36.300, V8.70 (2009-03), Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN), Overall description Stage2 3GPP TS (Technical Specification) 36.321, V8.50 (2009-03), Evolved Universal Terrestrial Radio Access (E-UTRA) Medium Access Control (MAC) protocol specification 3GPP TS (Technical Specification) 36.331, V8.50 (2009-03), Evolved Universal Terrestrial Radio Access (E-UTRA) Radio Resource Control (RRC) Protocol specification 3GPP TR
  • the present invention has been made in view of such circumstances, and provides a mobile station device, a base station device, a communication system, and a random access method that enable efficient random access to an Advanced-EUTRA system.
  • the purpose is to do.
  • the mobile station apparatus of the present invention is a mobile station apparatus that performs random access to the base station apparatus, and based on the number of transmission antennas, any one of a plurality of sequence groups determined in advance.
  • a sequence group is selected, one of the selected sequence groups is randomly selected, a random access preamble is generated using the selected sequence, and the generated random access preamble is transmitted to the base station apparatus.
  • uplink data is created based on uplink scheduling information included in the random access response, Select Using transmission diversity scheme corresponding to the sequence group, and transmits the uplink data to the base station apparatus.
  • the mobile station apparatus selects any one of a plurality of predetermined sequence groups based on the number of transmission antennas, and randomly selects any one sequence from the selected sequence groups. And generating a random access preamble using the selected sequence, it is possible to transmit the message 3 in accordance with the capability of the mobile station apparatus. Furthermore, uplink data is created based on the uplink scheduling information included in the random access response, and uplink data is transmitted to the base station apparatus using a transmission diversity method corresponding to the selected sequence group. As a result, the reception characteristics can be improved by the diversity effect compared to the case where data is transmitted by one transmission antenna.
  • a mobile station apparatus is a mobile station apparatus that performs random access to a base station apparatus, and measures a downlink radio propagation path state based on a signal transmitted from the base station apparatus. Based on the number of transmission antennas and the downlink radio propagation path state, one of a plurality of predetermined sequence groups is selected, and one of the sequences is selected from the selected sequence group.
  • Random selection generating a random access preamble using the selected sequence, and transmitting the generated random access preamble to the base station apparatus, while a random access response corresponding to the transmitted random access preamble Is received from the base station device,
  • the data of the number of resource blocks corresponding to the selected sequence group is mapped from the starting position information of the uplink resource indicated by the uplink scheduling information included in the access response, and the transmission diversity method corresponding to the selected sequence group is used. Then, the uplink data is transmitted to the base station apparatus.
  • the mobile station apparatus measures the downlink radio propagation path state based on the signal transmitted from the base station apparatus, and is determined in advance based on the number of transmission antennas and the downlink radio propagation path state.
  • the message 3 can be transmitted according to the capability of the mobile station apparatus, and the message 3 can be transmitted according to the radio transmission quality.
  • mapping data of the number of resource blocks corresponding to the sequence group selected from the uplink resource start position information indicated by the uplink scheduling information included in the random access response the resource block position for transmitting the message 3 is determined.
  • the information shown can be represented in one format.
  • the uplink data is transmitted to the base station apparatus, so that the reception characteristic is improved due to the diversity effect compared to the case where the data is transmitted by one transmission antenna. Can be improved.
  • the mobile station apparatus of the present invention is a mobile station apparatus that performs random access to the base station apparatus, and is any one of a plurality of sequence groups that are determined in advance based on the number of transmission antennas. Selecting one sequence group, randomly selecting any one sequence from the selected sequence group, and using the selected sequence, a scheduling unit that generates a random access preamble, and the generated random access preamble A radio unit that transmits to the base station device, and the scheduling unit is included in the random access response when a random access response corresponding to the transmitted random access preamble is acquired from the base station device. Uplink schedule Based on ring information, uplink data is created, and the radio unit transmits uplink data to the base station apparatus using a transmission diversity method corresponding to the selected sequence group.
  • the mobile station apparatus selects any one of a plurality of predetermined sequence groups based on the number of transmission antennas, and randomly selects any one sequence from the selected sequence groups. And generating a random access preamble using the selected sequence, it is possible to transmit the message 3 in accordance with the capability of the mobile station apparatus. Furthermore, by using the transmission diversity method corresponding to the selected sequence group, the uplink data is transmitted to the base station apparatus, so that the data can be received with a diversity effect as compared with the case where the data is transmitted by one transmission antenna. Characteristics can be improved.
  • the mobile station apparatus of the present invention is a mobile station apparatus that performs random access to the base station apparatus, and measures a downlink radio propagation path state based on a signal transmitted from the base station apparatus. Based on the reception processing unit, the number of transmission antennas, and the downlink radio propagation path state, one of a plurality of predetermined sequence groups is selected, and any one of the selected sequence groups is selected.
  • the scheduling unit supports the transmitted random access preamble
  • data of the number of resource blocks corresponding to the selected sequence group is determined from the uplink resource start position information indicated by the uplink scheduling information included in the random access response. Mapping is performed, and the radio unit transmits the uplink data to the base station apparatus using a transmission diversity scheme corresponding to the selected sequence group.
  • the mobile station apparatus selects one sequence group from a plurality of predetermined sequence groups based on the number of transmission antennas and the downlink radio propagation path state, and selects the selected sequence group. 1 is selected at random, and a random access preamble is generated using the selected sequence, so that the message 3 can be transmitted according to the capability of the mobile station apparatus and the wireless transmission quality It is also possible to transmit the message 3 according to the above. Further, by mapping data of the number of resource blocks corresponding to the sequence group selected from the uplink resource start position information indicated by the uplink scheduling information included in the random access response, the resource block position for transmitting the message 3 is determined. The information shown can be represented in one format. Furthermore, by using the transmission diversity method corresponding to the selected sequence group, the uplink data is transmitted to the base station apparatus, so that the reception characteristic is improved due to the diversity effect compared to the case where the data is transmitted by one transmission antenna. Can be improved.
  • the base station apparatus is a base station apparatus that receives random access from the mobile station apparatus, and detects a random access preamble transmitted from the mobile station apparatus through a random access channel. Schedule the resource block position and the number of resource blocks used in the corresponding uplink data transmission, create a random access message including information indicating the start position of the scheduled resource block, and create The random access message is transmitted to the mobile station apparatus.
  • the base station apparatus performs scheduling of the position and the number of resource blocks used in uplink data transmission corresponding to the random access preamble, and information indicating the start position of the scheduled resource block By creating a random access message including, information indicating the resource block position where the message 3 is transmitted can be expressed in one format.
  • a base station apparatus of the present invention is a base station apparatus that receives random access from a mobile station apparatus, and detects a random access preamble transmitted from the mobile station apparatus through a random access channel, and the detection
  • a random access message including information indicating a position of a resource block used in uplink data transmission corresponding to the random access preamble and the number of resource blocks, and information indicating a start position of the scheduled resource block
  • a base station side radio unit for transmitting the created random access message to the mobile station apparatus.
  • the base station apparatus schedules the position of the resource block and the number of resource blocks used in uplink data transmission corresponding to the detected random access preamble, and determines the start position of the scheduled resource block.
  • information indicating the resource block position where the message 3 is transmitted can be expressed in one format.
  • a plurality of sequences used by the mobile station apparatus for random access are based on the number of transmission antennas and downlink radio propagation path characteristics of the mobile station apparatus.
  • the information is classified into a plurality of sequence groups, and information indicating the number of sequences of each sequence group is included in broadcast information and transmitted to the mobile station apparatus.
  • a plurality of sequences used by a mobile station device for random access are classified into a plurality of sequence groups based on the number of transmission antennas and downlink radio channel characteristics of the mobile station device, thereby moving
  • the message 3 can be transmitted according to the capability of the station apparatus, and the message 3 can be transmitted according to the radio transmission quality.
  • the data transmitted from the mobile station apparatus to the scheduled resource block is demodulated for the type of transmission diversity method used by the mobile station apparatus. It is characterized by.
  • a plurality of transmission diversity transmissions can be performed within one sequence group, and the number of sequences within the sequence group can be increased, so that the randomness within the sequence group can be increased.
  • the communication system of the present invention includes a base station apparatus and a mobile station apparatus, and the mobile station apparatus performs random access based on the number of transmission antennas and downlink radio propagation path characteristics of the mobile station apparatus.
  • the downlink radio propagation path state is measured based on the received signal, and one of the plurality of predetermined sequence groups is determined based on the number of transmission antennas and the downlink radio propagation path state. Select any one sequence from the selected sequence group, and select the selected sequence.
  • a random access preamble is generated using the generated sequence, the generated random access preamble is transmitted to the base station device, and the base station device transmits the random access transmitted from the mobile station device through a random access channel.
  • a preamble is detected, scheduling of the position and the number of resource blocks used for uplink data transmission corresponding to the random access preamble is performed, and information indicating the start position of the scheduled resource block is displayed.
  • a random access message including the generated random access message, and transmitting the generated random access message to the mobile station device, wherein the mobile station device performs random access corresponding to the transmitted random access preamble.
  • the data of the number of resource blocks corresponding to the selected sequence group is mapped from the start position information of the uplink resource indicated by the uplink scheduling information included in the random access response,
  • the uplink data is transmitted to the base station apparatus using a transmission diversity method corresponding to the selected sequence group.
  • the mobile station apparatus selects one sequence group from a plurality of predetermined sequence groups based on the number of transmission antennas and the downlink radio propagation path state, and selects the selected sequence group. 1 is selected at random, and a random access preamble is generated using the selected sequence, so that the message 3 can be transmitted according to the capability of the mobile station apparatus and the wireless transmission quality It is also possible to transmit the message 3 according to the above. Further, by mapping data of the number of resource blocks corresponding to the sequence group selected from the uplink resource start position information indicated by the uplink scheduling information included in the random access response, the resource block position for transmitting the message 3 is determined. The information shown can be represented in one format. Furthermore, by using the transmission diversity method corresponding to the selected sequence group, the uplink data is transmitted to the base station apparatus, so that the reception characteristic is improved due to the diversity effect compared to the case where the data is transmitted by one transmission antenna. Can be improved.
  • the base station apparatus includes information indicating the number of sequences of each sequence group included in broadcast information and transmits the information to the mobile station apparatus.
  • the base station apparatus includes information indicating the number of sequences of each sequence group in the broadcast information and transmits the information to the mobile station apparatus, so that the message 3 can be transmitted in accordance with the capability of the mobile station apparatus.
  • the message 3 can be transmitted according to the wireless transmission quality.
  • a random access method includes a base station apparatus and a mobile station apparatus, and the mobile station apparatus is randomly selected based on the number of transmission antennas and downlink radio propagation path characteristics of the mobile station apparatus.
  • the mobile station apparatus classifies the plurality of sequences used by the mobile station apparatus for random access into a plurality of sequence groups based on the number of transmission antennas and downlink radio propagation path characteristics of the mobile station apparatus, and
  • message 3 can be transmitted in accordance with the capability of the mobile station apparatus, and message 3 can be transmitted according to the radio transmission quality.
  • scheduling of the position of the resource block and the number of resource blocks used in uplink data transmission corresponding to the random access preamble and a random access message including information indicating the start position of the scheduled resource block are performed.
  • the information indicating the resource block position where the message 3 is transmitted can be expressed in one format.
  • the uplink data is transmitted to the base station apparatus, so that the reception characteristic is improved due to the diversity effect compared to the case where the data is transmitted by one transmission antenna. Can be improved.
  • the message 3 can be transmitted to the Advanced-EUTRA system according to the capability of the mobile station apparatus, and the message 3 can be transmitted according to the radio transmission quality. Thereby, efficient random access can be made possible.
  • FIG. It is a figure which shows the 2nd example of the sequence group which concerns on embodiment of this invention. It is a figure which shows the 3rd example of the sequence group which concerns on embodiment of this invention. It is a figure which shows the example of allocation of the resource block which transmits the message 3.
  • FIG. It is a flowchart which shows the example of a production
  • the OFDM scheme has been proposed as the EUTRA downlink. Also, a DFT-spread OFDM single carrier communication scheme has been proposed as an EUTRA uplink.
  • downlink pilot channel DPiCH Downlink Pilot Channel
  • downlink synchronization channel DSCH Downlink Synchronization Channel
  • downlink shared channel PDSCH Physical Downlink Shared Channel
  • downlink control channel PDCCH Physical Downlink Control Channel
  • a common control channel CCPCH Common Control Control Physical Channel
  • the uplink pilot channel UPiCH Uplink Pilot Channel
  • random access channel RACH Random Access Channel
  • uplink shared channel PUSCH Physical Uplink Shared Channel
  • uplink control channel PUCCH Physical Uplink Control Channel
  • FIG. 1 is a diagram illustrating a channel configuration in EUTRA
  • FIG. 2 is a diagram illustrating an uplink configuration in EUTRA.
  • One block is composed of 12 subcarriers and 7 OFDM symbols. Then, one resource block is configured using two blocks.
  • RACH random access channel
  • one random access channel is prepared in one subframe, and corresponds to access from a large number of mobile station apparatuses, for example, the mobile station apparatuses 1-1 to 1-3. Yes.
  • the configuration of the random access channel RACH is notified from the base station device 3 to the mobile station devices 1-1 to 1-3 as broadcast information.
  • the random access channel is periodically arranged, and the random access channel RACH, the uplink shared channel PUSCH region, and the uplink control channel PUCCH region are divided as illustrated.
  • the random access channel RACH is configured using 6 resource blocks (Non-Patent Document 1).
  • the purpose of using the random access channel is to synchronize the mobile station apparatuses 1-1 to 1-3 and the base station apparatus 3 in the uplink.
  • the random access procedure has two access procedures: Contention-based Random Access and Non-contention base Random Access.
  • FIG. 3 is a diagram showing the procedure of Contention based Random Access.
  • Contention based Random Access is random access that may collide between mobile station apparatuses, and is normally performed random access.
  • FIG. 4 is a diagram showing the procedure of Non-contention based Random Access.
  • Non-contention based Random Access is a random access in which no collision occurs between mobile station devices, and in order to quickly synchronize between the mobile station device and the base station device, in special cases such as handover, the base station This is performed instructed by the apparatus (Non-patent Document 3).
  • the mobile station apparatus 1-1 accesses the random access channel RACH, it transmits only the random preamble.
  • the random access preamble is composed of a preamble part and a CP (Cyclic Prefix) part.
  • the preamble portion uses a CAZAC (Constant-Amplitude-Zero-Auto-Correlation-Zone-Code) sequence which is a signal pattern representing information, and 64 types of sequences are prepared to express 6-bit information.
  • CAZAC Constant-Amplitude-Zero-Auto-Correlation-Zone-Code
  • FIG. 5 is a diagram showing an example of a sequence group in EUTRA.
  • the 64 sequences are divided into three sequence groups depending on the application.
  • the sequences of group A and group B are selected when the mobile station apparatus itself selects the sequence and performs random access.
  • the sequence of group A is selected by the mobile station apparatus when the path loss between the mobile station apparatus and the base station apparatus is large (the radio propagation path quality is poor) or the transmission capacity of the message 3 is small.
  • the sequence of group B is selected by the mobile station apparatus when the path loss between the mobile station apparatus and the base station apparatus is small (the radio channel quality is good) and the transmission capacity of the message 3 is large.
  • the sequence of group C is notified from the base station apparatus to the mobile station apparatus when the Non-contention based Random Access procedure is used. Note that the number of sequences in each group is variable, and information regarding the number of sequences in each group is reported from the base station apparatus.
  • the mobile station device 1-1 transmits a random access preamble to the base station device 3 (message 1: (1), step S1).
  • the base station device 3 that has received the random access preamble transmits a response to the random access preamble (random access response) to the mobile station device 1-1 (message 2: (2), step S2).
  • the mobile station device 1-1 transmits an upper layer (Layer2 / Layer3) message based on the scheduling information included in the random access response (message 3: (3), step S3).
  • the base station device 3 transmits a collision confirmation message to the mobile station device 1-1 that has received the upper layer message of (3) (message 4: (4), step S4).
  • the base station apparatus 3 notifies the mobile station apparatus 1-1 of the preamble number (or sequence number) and the random access channel number to be used (message 0: (1) ', step S11).
  • the mobile station apparatus 1-1 transmits the random access preamble having the designated preamble number to the designated random access channel RACH (message 1: (2) ', step S12).
  • the base station device 3 that has received the random access preamble transmits a response to the random access preamble (random access response) to the mobile station device 1-1 (message 2: (3) ', step S13).
  • the mobile station apparatus 1-1 selects a sequence group based on the downlink path loss and the size of the message 3.
  • One CAZAC sequence is randomly selected from the selected sequence group, a random access preamble is generated based on the selected CAZAC sequence, and the random access preamble is transmitted on the random access channel RACH (message 1: (1) ).
  • the base station apparatus 3 When the base station apparatus 3 detects the random access preamble from the mobile station apparatus 1-1, the base station apparatus 3 calculates a transmission timing deviation amount between the mobile station apparatus 1-1 and the base station apparatus 3 from the random access preamble, and L2 / Scheduling (designating uplink radio resource position, transmission format (message size), etc.) to transmit L3 message, assigning Temporary C-RNTI (Cell-Radio Network Temporary Identity), downlink An RA-RNTI indicating a response (random access response) addressed to the mobile station apparatus 1-1 that has transmitted the random access preamble of the random access channel RACH is arranged on the link control channel PDCCH, and transmission timing deviation information is assigned to the downlink shared channel PDSCH, The A random access response message including the scheduling information, Temporary C-RNTI, and the preamble number (sequence number) of the received preamble is transmitted (message 2: (2)).
  • L2 / Scheduling designating uplink radio resource position, transmission format
  • radio resource allocated to the mobile station apparatus 1-1 by this random access response is only one resource block (one subframe).
  • the mobile station apparatus 1-1 When the mobile station apparatus 1-1 detects the presence of RA-RNTI in the downlink control channel PDCCH, the mobile station apparatus 1-1 confirms the contents of the random access response message arranged in the downlink shared channel PDSCH and corresponds to the transmitted random access preamble. Message information is extracted, the transmission timing deviation is corrected, and the C-RNTI (or Temporary C-RNTI) or IMSI (International Mobile Subscriber Identity) is used as the scheduled radio resource and transmission format. ) Or the like to transmit the L2 / L3 message including the information for identifying the mobile station apparatus 1-1 (message 3: (3)).
  • C-RNTI or Temporary C-RNTI
  • IMSI International Mobile Subscriber Identity
  • the mobile station apparatus 1-1 continues to wait for a certain period of time for the random access response message from the base station apparatus 3, and if it does not receive the random access response message including the preamble number of the transmitted random access preamble, the mobile station apparatus 1-1 again Send the access preamble.
  • the base station apparatus 3 When the base station apparatus 3 receives the L2 / L3 message from the mobile station apparatus 1-1, the base station apparatus 3 uses the C-RNTI (or Temporary C-RNTI) or IMSI included in the received L2 / L3 message.
  • C-RNTI or Temporary C-RNTI
  • IMSI included in the received L2 / L3 message.
  • a collision confirmation (contention resolution) message for determining whether or not a collision occurs between 1-1 and 1-3 is transmitted to the mobile station apparatus 1-1 (message 4: (4)).
  • the mobile station apparatus 1-1 does not detect the random access response message including the preamble number corresponding to the random access preamble transmitted within the predetermined period, fails to transmit the message 3, or is fixed period. If the identification information of the mobile station apparatus 1-1 is not detected in the collision confirmation message, transmission is repeated from transmission of the random access preamble (message 1: (1)) (Non-Patent Documents 3 and 4). After the random access procedure is completed, control data for connection is further exchanged between the base station apparatus 3 and the mobile station apparatus 1-1.
  • Advanced-EUTRA a further evolution of EUTRA.
  • communication at a maximum transmission rate of 1 Gbps or higher and 500 Mbps or higher of the uplink is performed using a band up to a maximum of 100 MHz bandwidth in the uplink and the downlink, respectively.
  • FIG. 6 is an explanatory diagram of downlink component carriers in Advanced-EUTRA.
  • FIG. 7 is an explanatory diagram of an uplink component carrier in Advanced-EUTRA.
  • Advanced-EUTRA is considering realizing a 100 MHz band by bundling a plurality of 20 MHz bands of EUTRA so that EUTRA mobile station devices can be accommodated.
  • one 20 MHz band of EUTRA is called a component carrier (Component Carrier: CC) (Non-patent Document 6).
  • 8 ⁇ 8 MIMO Multiple Input Multiple Output
  • 8 transmit antenna diversity in the downlink allows for even faster data transmission / reception. To make it possible.
  • FIG. 8 is a diagram illustrating the configuration of the mobile station apparatus according to the embodiment of the present invention.
  • the mobile station apparatuses 1-1 to 1-3 include a radio unit 101, a transmission processing unit 103, a reception processing unit 105, a transmission data control unit 107, a scheduling unit 109, a control data extraction unit 111, a random access preamble generation unit 113, a transmission
  • the timing adjustment unit 115 is configured.
  • the scheduling unit 109 includes a control data creation unit 117, a control data analysis unit 119, a UL scheduling unit 121, and a random access management unit 123.
  • the transmission data control unit 107 assigns each data to each channel according to an instruction from the scheduling unit 109, and instructs a transmission method (MIMO or transmission diversity method).
  • the data is sent to the transmission processing unit 103.
  • transmission processing section 103 the signal from transmission data control section 107 is encoded and modulated.
  • the modulated signal is processed for transmission diversity scheme and MIMO, DFT-IFFT (Inverse Fast Fourier Transform) processing, and CP is inserted.
  • the transmission timing adjustment unit 115 adjusts the data transmission timing from the transmission timing deviation information passed from the scheduling unit 109, adjusts the transmission timing, and then upconverts to a radio frequency by the radio unit 101 and transmits it from the transmission antenna.
  • the radio unit 101 down-converts the radio signal received from the antenna and passes it to the reception processing signal unit.
  • the reception processing unit 105 performs FFT (Fast Transform) processing, decoding, demodulation processing, and the like on the signal passed from the wireless unit 101, and passes the demodulated data to the control data extraction unit 111. Also, downlink radio propagation path characteristics are measured, and the measurement result is passed to scheduling section 109.
  • Control data extraction section 111 looks at C-RNTI (mobile station apparatus identification information) arranged in downlink control channel PDCCH, determines whether the data is addressed to the own mobile station apparatus, and determines data addressed to the own mobile station apparatus.
  • C-RNTI mobile station apparatus identification information
  • the downlink shared channel PDSCH data demodulated by the reception processing unit 105 is divided into control data and user data. Then, the control data is passed to the scheduling unit 109, and the user data is passed to the upper layer.
  • the RA-RNTI Random Access-Radio Network Temporary Identity
  • the random access response message is passed to the scheduling unit 109. In addition, it instructs the scheduling unit 109 to return a response to the received data.
  • the scheduling unit 109 includes a UL scheduling unit 121, a control data analysis unit 119, a control data creation unit 117, and a random access management unit 123.
  • the control data creation unit 117 creates control data
  • the control data extraction unit 111 Create a response for the received downlink data.
  • the control data analysis unit 119 analyzes the data from the control data extraction unit 111, passes uplink data scheduling information to the UL scheduling unit 121, and information on random access broadcast from the base station apparatus 3 (random access channel RACH). And the random access response message content are passed to the random access management unit 123 and the random access preamble generation unit 113.
  • the UL scheduling unit 121 controls the transmission data control unit 107 based on the scheduling information.
  • the random access management unit 123 selects a sequence group of a sequence to be used for random access based on the downlink radio channel characteristics and the number of antennas of the own mobile station apparatus passed from the reception processing unit 105 Then, one sequence is randomly selected from the selected sequence group, and the selected sequence number (preamble number) is notified to the random access preamble generation unit 113.
  • the transmission timing deviation information is passed to the transmission timing adjustment unit 115, and the assigned radio A radio resource allocated from the start position information of the resource and the selected sequence group is calculated, and the position of the radio resource, the number of resources, and the transmission diversity scheme are passed to the UL scheduling unit 121.
  • the contention resolution message is confirmed, the random access is terminated.
  • the random access preamble generation unit 113 generates a preamble part and a CP part with a preamble number (sequence number) designated by the scheduling unit 109 based on the sequence information passed from the scheduling unit 109 and the random access channel position information.
  • a random access preamble is generated, and a random access channel RACH position to be used is selected and assigned to the random access channel RACH.
  • FIG. 9 shows a configuration diagram of the base station apparatus 3 according to the embodiment of the present invention.
  • the base station includes a data control unit 201, a transmission processing unit 203, a scheduling unit 205 (base station side scheduling unit), a reception processing unit 207, a control data extraction unit 209, a preamble detection unit 211, and a radio unit 213.
  • the scheduling unit 205 includes a DL scheduling unit 215, a UL scheduling unit 217, and a control data creation unit 219.
  • the data control unit 201 transmits user data and control data to the downlink control channel PDCCH, the downlink synchronization channel DSCH, the downlink pilot channel DPiCH, the common control channel CCPCH, and the downlink shared channel PDSCH according to an instruction from the scheduling unit 205. And the transmission data for each of the mobile station apparatuses 1-1 to 1-3 is mapped to the downlink shared channel PDSCH.
  • the transmission processing unit 203 performs OFDM signal processing such as data modulation, serial / parallel conversion of input signals, IFFT conversion, CP insertion, filtering, and the like to generate an OFDM signal.
  • the radio unit 213 up-converts the OFDM modulated data to a radio frequency and transmits it to the mobile station apparatus 1-1.
  • Radio section 213 receives uplink data from mobile station apparatus 1-1, down-converts it into a baseband signal, and passes the received data to reception processing section 207 and preamble detection section 211.
  • the reception processing unit 207 performs demodulation processing in consideration of transmission processing (transmission diversity scheme or MIMO) performed by the mobile station apparatus 1-1 from the uplink scheduling information from the scheduling unit 205, and demodulates data. .
  • the reception processing unit 207 measures the radio channel characteristics from the uplink pilot channel UPiCH and passes the result to the scheduling unit 205.
  • the uplink communication scheme is assumed to be a single carrier scheme such as DFT-spread OFDM, but a multicarrier scheme such as the OFDM scheme may be used.
  • the control data extraction unit 209 confirms the correctness of the received data and notifies the scheduling unit 205 of the confirmation result. If the received data is correct, the received data is separated into user data and control data.
  • Scheduling section 205 includes DL scheduling section 215 that performs downlink scheduling, UL scheduling section 217 that performs uplink scheduling, and control data creation section 219, and DL scheduling section 215 is notified from mobile station apparatus 1-1.
  • DL scheduling section 215 For mapping user data and control data to each downlink channel from downlink radio propagation path information, data information of each user notified from higher layers and control data created by the control data creation unit 219
  • the UL scheduling unit 217 maps user data to each uplink channel from the uplink radio channel estimation result from the reception processing unit 207 and the radio resource allocation request from the mobile station device 1-1. That for the scheduling (modulation and coding scheme allocation and data resource blocks, the determination of such transmission diversity scheme) performs, it passes a scheduling result to the control data creation unit 219 to the reception processing unit 207.
  • the control data creation unit 219 includes a control message including scheduling information, an ACK / NACK for uplink data, a broadcast information message including information on random access such as information on random access channel positions and information on sequence information and sequence groups, a preamble Control data such as a random access response message and contention resolution message including numbers, transmission timing deviation information, and scheduling information are created.
  • the preamble detection unit 211 calculates a transmission timing deviation amount, and reports the detected preamble number and transmission timing deviation amount to the scheduling unit 205.
  • the mobile station apparatus 1-1 of the present invention is assumed to be a mobile station apparatus having one or more transmission antennas.
  • the EUTRA mobile station apparatus uses only one transmission antenna for uplink data transmission.
  • the Advanced-EUTRA mobile station apparatus has a plurality of transmission antennas, and at the start of communication such as at the time of random access, since the radio propagation path characteristics are not known, a plurality of antennas such as MIMO are used.
  • Data transmission is not possible, but transmission such as CDD (Cyclic Delay Delay Diversity), STBC Space Space Time Block Code Transmit Diversity, SFBC Space Space Frequency Block Transmit Code Diversity, FSTD (Frequency Switch Transmit Transmit Diversity), PVS (Precoding Vector Switching), etc.
  • the diversity method can be used for data transmission and reception as long as the transmission diversity method is determined in advance.
  • an Advanced-EUTRA mobile station apparatus When data is transmitted using transmission diversity, the reception characteristics are improved due to the diversity effect compared to the case where data is transmitted with one transmission antenna.
  • an Advanced-EUTRA mobile station apparatus is considered to have a maximum of four transmission antennas, a mobile station apparatus with two transmission antennas is also considered in order to simplify the mobile station apparatus.
  • the sequence group is divided according to the transmission diversity for transmitting the message 3 and the number of transmission antennas.
  • the message 3 can be transmitted in accordance with the capability of the mobile station apparatus.
  • the sequence groups may be divided according to the transmission diversity for transmitting the message 3, the number of transmission antennas, and the quality of the propagation path.
  • FIG. 10 is a first example of a sequence group according to the embodiment of the present invention. This is an example in which the random access preamble sequence group is divided into three groups of no transmission diversity, two transmission antenna transmission diversity, and four transmission antenna diversity according to the number of transmission antennas and the transmission diversity method.
  • FIG. 11 is a second example of the sequence group according to the embodiment of the present invention.
  • the sequence group of the random access preamble has no transmission diversity, or the group with the poor radio propagation path and the group with 2 transmission antenna transmission diversity and the quality of the radio propagation path is good, This is an example in which the group is divided into three groups of four transmit antenna diversity and good radio propagation path quality.
  • FIG. 12 is a third example of the sequence group according to the embodiment of the present invention.
  • the random access preamble sequence group has no transmission diversity, or the group with the poor radio propagation path and the group with the 4 transmission antenna diversity and the radio propagation path with the poor quality 2
  • the transmission antenna transmission diversity and the radio propagation path have a good quality group
  • the transmission antenna diversity and the radio propagation path have a good quality.
  • the number of sequences in each sequence group is transmitted from the base station apparatus to the mobile station apparatus as broadcast information. Further, the base station apparatus may transmit information on a part of the sequence groups, and the mobile station apparatus may calculate the number of sequences of all the sequence groups from this information. The number of sequence groups may be fixed or may be changed depending on the communication status.
  • the message 3 may be transmitted using a plurality of resource blocks. By doing so, the amount of data transmitted by the message 3 increases, so that the exchange of control data between the base station apparatus 3 and the mobile station apparatus performed after the random access procedure is completed can be shortened.
  • the mobile station apparatus 1-1 measures downlink radio channel characteristics (path loss, etc.). Then, the sequence group is selected from the number of antennas of the mobile station apparatus 1-1 and the measured downlink radio propagation path characteristics. One sequence is selected at random from the selected sequence group, a random access preamble is generated based on the selected sequence, and the random access preamble is transmitted to the random access channel RACH.
  • the base station apparatus 3 When the base station apparatus 3 detects the random access preamble on the random access channel RACH, the base station apparatus 3 calculates a transmission timing shift of the detected random access preamble. Then, scheduling for the message 3 of the mobile station apparatus 1-1 is performed. Then, a random access response message including the detected preamble number (sequence number) of the random access preamble, transmission timing deviation information, and uplink scheduling information is created, and the random access response is transmitted to the mobile station apparatus 1-1.
  • the mobile station apparatus 1-1 Upon receiving the random access response message, the mobile station apparatus 1-1 checks whether there is a preamble number corresponding to the transmitted random access preamble. If there is a preamble number, the mobile station apparatus 1-1 extracts transmission timing deviation information and uplink scheduling information. Then, the transmission timing is corrected based on the transmission timing deviation information, and data (L2 / L3 message: message 3) is transmitted using the scheduled radio resource (uplink shared channel PUSCH). At this time, data is transmitted using a transmission diversity method corresponding to the sequence group.
  • the base station apparatus 3 When the base station apparatus 3 receives data at the scheduled position, the base station apparatus 3 transmits a collision confirmation message (contention resolution) to the mobile station apparatus 1-1 that has successfully received the data. When the mobile station apparatus 1-1 receives the collision confirmation message, the mobile station apparatus 1-1 ends the random access procedure.
  • a collision confirmation message contention resolution
  • the base station device 3 When the base station device 3 detects the random access preamble on the random access channel RACH, the base station device 3 calculates a transmission timing shift of the detected random access preamble. Then, Temporary C-RNTI is allocated and scheduling for message 3 of mobile station apparatus 1-1 is performed. This scheduling determines the number of resource blocks for transmitting the message 3, the position of the resource block, the data modulation / coding scheme, the transmission power, and the like.
  • FIG. 13 is a diagram illustrating an example of allocation of resource blocks for transmitting the message 3.
  • the information indicating the resource block position for transmitting the message 3 indicates the start position of the scheduled resource block in consideration of a plurality of resource blocks, and indicates that the number of resource blocks corresponding to the sequence group has been allocated.
  • the information indicating the resource block position for transmitting the message 3 may be in one format.
  • sequence group C (4 transmit antenna diversity and propagation path quality-good) indicates allocation of 3 resource blocks from the start position
  • sequence group B (2 transmit antenna diversity and propagation path quality-good) is from the start position.
  • 2 shows allocation of 2 resource blocks
  • sequence group A no transmission antenna diversity or propagation path quality-bad
  • a random access response message including a preamble number (sequence number) of the detected random access preamble, transmission timing deviation information, C-RNTI and uplink scheduling information is created, and a random access response is sent to the mobile station apparatus 1-1. Send a message.
  • the base station apparatus 3 demodulates the resource block at the scheduled position by the transmission diversity method corresponding to the sequence group, and processes the message 3 when confirming the message 3 from the mobile station apparatus 1-1.
  • a collision confirmation message (contention resolution) is transmitted to the mobile station apparatus 1-1.
  • FIG. 14 is a flowchart showing an example of a random access preamble generation operation according to the embodiment of the present invention.
  • the mobile station apparatus 1-1 acquires and sets parameters related to random access (position of the random access channel RACH, sequence information, information about sequence groups, etc.) broadcast from the base station apparatus 3.
  • the mobile station device 1-1 measures downlink radio channel characteristics (path loss, etc.) (step S101).
  • the radio channel quality is good or bad (step S102). If the radio channel quality is poor, sequence group A is selected (step S103). On the other hand, if it is determined in step S102 that the radio channel quality is good, it is determined whether there are two or more transmission antennas (step S104).
  • step S105 When the number of transmitting antennas is less than 2, select sequence group A. On the other hand, if there are two or more transmission antennas, it is determined whether there are two or four transmission antennas (step S105). When there are two transmission antennas, sequence group B is selected (step S106). On the other hand, when there are four transmission antennas, the sequence group C is selected (step S107).
  • a sequence is selected at random from the selected sequence group (step S108).
  • a preamble part is created based on the selected sequence, and a CP part is added to generate a random access preamble (step S109).
  • the selected sequence number (preamble number) is saved. Then, the transmission power of the random access preamble is set based on the path loss, the position of the broadcast random access channel RACH is confirmed, and the random access preamble is transmitted to the base station apparatus 3.
  • the mobile station apparatus 1-1 waits for a random access response from the base station apparatus 3 after transmitting the random access preamble.
  • the random access response message is received, it is checked whether or not there is a stored preamble number. If there is a preamble number, Temporary C-RNTI, transmission timing deviation information, and uplink scheduling information are extracted. Radio resources (uplink shared) that have been scheduled by correcting the uplink transmission timing based on the transmission timing deviation information, modulating the data with the specified encoding / modulation method, and setting the specified transmission power Data (L2 / L3 message: message 3) is transmitted on channel PUSCH.
  • the mobile station apparatus 1-1 using the sequence of group B or group C uses the number of resource blocks corresponding to the sequence group from the designated start position, and uses the transmission diversity method corresponding to each sequence group. Send data.
  • mobile station apparatus 1-1 having a plurality of antennas selects group A, the same signal may be transmitted from a plurality of antennas instead of transmitting by a single antenna. .
  • the mobile station device 1-1 After transmitting the message 3, the mobile station device 1-1 waits for contention resolution from the base station device 3. When the mobile station apparatus 1-1 receives the contention resolution, the mobile station apparatus 1-1 ends the random access procedure.
  • the mobile station apparatus 1-1 does not receive a random access response even after waiting for a certain period of time, or if the preamble number does not match even after receiving a random access response, or if it does not receive contention resolution, The random access preamble is transmitted again.
  • FIG. 15 is a diagram showing an example of broadcast group notification information according to the embodiment of the present invention.
  • FIG. 16 is a fourth example of the sequence group according to the embodiment of the present invention.
  • FIG. 12 shows an example in which the group is divided into four groups. However, if the number of groups is increased, the number of sequences in each group decreases, and therefore randomness within the group decreases.
  • a random access preamble sequence group has no transmission diversity, a group with poor radio propagation path and a group with four transmission antenna diversity and poor quality of radio propagation path, or two transmission antenna transmission diversity and radio propagation.
  • the group is divided into three groups: a group with good path quality, a group with 4 transmit antenna diversity, and a group with good radio channel quality, and the resource block numbers of message 3 are assigned as 1, 2, and 3, respectively.
  • the base station apparatus 3 performs two demodulation processes of 2 transmit diversity and 4 transmit diversity in the message 3 reception process. Adopting the demodulated data. By doing so, since the base station apparatus 3 only performs demodulation processing about twice, the load is not excessive and the number of sequences in each sequence group increases, so that the randomness in the group is improved. .

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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Abstract

Afin de permettre un accès aléatoire efficace à un système EUTRA avancé, un groupe de séquences quelconque est sélectionné parmi de multiples groupes de séquences prédéterminés sur la base du nombre d'antennes d'émission, une séquence quelconque est sélectionnée de façon aléatoire dans le groupe de séquences sélectionné, un préambule d'accès aléatoire est produit à l'aide de la séquence sélectionnée, et le préambule d'accès aléatoire produit est transmis à un dispositif de station de base. Lorsqu'une réponse d'accès aléatoire correspondant au préambule d'accès aléatoire transmis est reçue provenant du dispositif de station de base, des données montantes sont créées sur la base d'informations d'ordonnancement montant incluses dans la réponse d'accès aléatoire, et les données montantes sont émises vers le dispositif de station de base à l'aide d'un mécanisme de diversité d'émission correspondant au groupe de séquences sélectionné.
PCT/JP2010/059139 2009-06-16 2010-05-28 Dispositif de station mobile, dispositif de station de base, système de communication et procédé d'accès aléatoire WO2010146980A1 (fr)

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WO2016029486A1 (fr) * 2014-08-30 2016-03-03 华为技术有限公司 Procédé et dispositif de transmission et de réception d'informations d'antennes

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