JP2007124493A - Random access method for forward link, mobile station and transmitter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To avoid collisions with other users even if many users access in random access from mobile stations through forward link in the VSCRF-CDMA or the IFDMA scheme. <P>SOLUTION: The mobile station 11 redetermines a phase which is to be used for random access transmission to a base station with replacing an individual corresponding table 40-m included with user ID, quality of services QoS and mobile station class every time if collisions occur between another mobile station 11' and itself, and Ack cannot been received from the base station. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a communication system using a single carrier communication method such as a VSCRF-CDMA method, an IFDMA method, or a DFT-spread OFDM method, and is performed at the start of communication in uplink communication from a mobile station to a base station. The present invention relates to an uplink random access method, and a mobile station and a transmitter for executing the method.

  Currently, in the third generation mobile communication called IMT (International Mobile Telecommunication) -2000, a W-CDMA (Wideband Code Division Multiple Access) method is adopted as a wireless access method.

  In the uplink access method of the W-CDMA system, a random access channel RACH (Random Access Channel) is used, and the basic operation in the random access channel RACH is performed by dividing the time axis into fixed time widths called time slots. This is performed using a slotted ALOHA (Additive Links Online Hawaii Area) method in which each wireless station transmits a packet according to this partition (see Non-Patent Document 1).

  FIG. 25 is an explanatory diagram of an uplink access method using the W-CDMA scheme.

  In this scheme, as shown in FIG. 25, each of a large number of users transmits a short-time signal called a preamble at a start timing determined when necessary using a random access channel RACH. When a mobile station is detected, communication such as a message is started between the mobile station and the base station, and when the base station cannot detect the mobile station due to a collision with another user or the like, the mobile station keeps the preamble until the base station detects it. The method of repeating transmission of is taken. The mobile station detects whether or not the base station has detected the mobile station based on the presence / absence of a response from the base station using an AICH (Acquisition Indication Channel).

  In addition, the preamble includes 16 types of sequences called signatures, and contrivances have been made to suppress collision between users based on the transmission timing to the random access channel RACH and the signature (Non-Patent Document 2).

  On the other hand, 3GPP (3rd Generation Partnership Project), as an uplink access technology for the next generation mobile communication system, has proposed various proposals such as a multicarrier communication system and a single carrier communication system, and an OFDM (Orthogonal Frequency Division Multiplexing) system. VSCRF-CDMA (Variable Spreading and Chip Repetition Factors Code Division Multiple Access, Variable Spreading Factor / Chip Repeat Code), which has better PAPR (Peak to Average Power Ratio) characteristics than multi-carrier communication systems such as Division Multiple Access) (see Non-Patent Document 3), IFDMA (Interleaved Frequency Division Multiple Access), and DFT-spread OFDM (or DFT (Discrete Fourier Transform) -S OFDM) (see Non-Patent Documents 7 and 8) Many single carrier communication systems such as It has been.

  In the IFDMA scheme, a comb-like frequency spectrum is generated by repeating a symbol sequence after data modulation at a constant period.

  On the other hand, the VSCRF-CDMA system uses the same principle as symbol repetition by assigning a part of time-domain spreading in DS-CDMA (Direct Spread Code Division Multiple Access) system to chip repetition. A tooth-like spectrum is generated.

FIG. 26 is an explanatory diagram of an uplink access method according to the VSCRF-CDMA system.
As shown in FIG. 26, in the uplink of the VSCRF-CDMA system, the time domain spreading chip (SF chip) is repeated by the number of times of chip repetition factor (CRF) to make one symbol, which is the time / frequency. By converting, a plurality of comb-shaped spectrums are generated in the frequency domain.

Further, the DFT-spread OFDM scheme has a configuration and principle as shown in FIGS.
FIG. 27 is a configuration diagram of the transmission side according to the DFT-spread OFDM scheme.
FIG. 28 is an explanatory diagram of the DFT-spread OFDM scheme.

  In the DFT-spread OFDM system, as shown in FIG. 27, the transmission side performs time / frequency conversion on M symbol data by an M-point FFT (Fast Fourier Transform) unit 71, and a subcarrier mapping unit 72 After the mapping is performed, a single carrier is generated by frequency / time conversion by an N-point IFFT (Inverse Fast Fourier Transform) unit 73 and output through the filter unit 29. More specifically, the subcarrier mapping unit 72 inserts a zero signal into the input from the M-point FFT unit 71 and outputs it to the N-point IFFT unit 73. As shown in FIG. By changing the insertion position of the zero signal with respect to the time-frequency conversion output for data, it is possible to generate a tooth-like spectrum and a localized spectrum that are not output by the VSCRF-CDMA system or the IFDMA system. At that time, the phase (subcarrier position) of the generated spectrum can be changed. In order to output the dent-like spectrum as shown in FIG. 28 (a), the subcarrier mapping unit 72 outputs (T-1) 0 signals between the subcarriers output from the M-point FFT unit 71. By inserting, it is possible to generate a tooth-like spectrum of T repeated combs. T is a subcarrier increase rate by the subcarrier mapping unit 72. In order to generate a localized spectrum as shown in FIG. 28B, the subcarrier mapping unit 72 does not insert a zero signal between the subcarriers output from the M-point FFT unit 71. By doing so, a localized spectrum can be generated.

“Physical channels and mapping of transport channels onto physical channels (FDD)”, 3GPP TS25.211; http://www.3gpp.org/ftp/Specs/html-info/25211.htm Keiji Tachikawa, “W-CDMA mobile communication system”, ISBN4-621-04894-5, P45 Yoshikazu Goto, Teruo Kawamura, Hiroyuki Shin, Mamoru Sawahashi "Uplink Variable Spreading Factor / Chip Repeat (VSCRF) -CDMA Broadband Wireless Access" IEICE Technical Report RCS-2003-67 “Medium Access Control (MAC) Protocol specification”, 3GPP TS 25.321; http://www.3gpp.org/ftp/Specs/html-info/25321.htm “Radio Resource Control (RRC) Protocol specification”, 3GPP TS 25.331; http://www.3gpp.org/ftp/Specs/html-info/25331.htm “Interlayer procedures in Connected Mode”, 3GPP TS 25.303; http://www.3gpp.org/ftp/Specs/html-info/25303.htm R1-050621 “Some aspects of single carrier transmission”, 3GPP TSG RAN WG1 Ad Hoc Metting on LTE, Sophia Antipolis, France, June 20-21, 2005 R1-050702 “DFT-Spread OFDM with Pulse Shaping Filter in Frequency Domain in Evolved UTRA Uplink”, 3GPP TSG RAN WG1 Meeting # 42 on LTE, London, UK, August 29-September 2, 2005

  However, studies on the single carrier communication system based on the currently proposed VSCRF-CDMA system, IFDMA system, or DFT-spread OFDM system are performed mainly for performance evaluation at the link level, and random access Control methods have not been studied. Further, in the random access method in which the preamble is first transmitted as in W-CDMA, there is a problem that it takes time to establish a radio link because of the access control method on the time axis. Further, since the random access channel RACH is a spread spectrum signal in the entire frequency band (5 MHz), there is a problem that a random control method on the frequency axis cannot be used.

  The present invention has been made in view of such a problem, and when a single carrier communication system such as a VSCRF-CDMA system, an IFDMA system, or a DFT-spread OFDM system is adopted as an uplink communication system, a mobile station It is an object to provide an uplink random access method, a mobile station, and a transmitter that can avoid collision with other users even when a large number of users access during random access from .

  In order to achieve the above object, the uplink random access method of the present invention is a single carrier communication system to which VSCRF-CDMA, IFDMA, or DFT-spread OFDM is applied. An uplink random access method that allows simultaneous access to one base station using a random access channel, and the transmission method of the comb-tooth spectrum of transmission data transmitted from the mobile station to the base station A transmission method determining step determined based on the transmission method, a transmission step of transmitting a comb-tooth spectrum of transmission data transmitted from the mobile station to the base station using a random access channel in the transmission method determined in the transmission method determining step, It is characterized by having.

  The uplink random access method of the present invention further includes a transmission destination base station when the comb-tooth spectrum of the transmission data of the random access channel transmitted from the mobile station in the transmission step is transmitted to the base station. If reception at the base station is confirmed by the reception confirmation step and the reception confirmation step for confirming whether or not reception is possible, the communication is switched from communication using the random access channel to communication using the traffic channel, while being received by the base station. If it is confirmed that the transmission method is not present, the transmission method determination step and the repetition step of executing the transmission step using own mobile station information different from this time are included.

  The mobile station of the present invention is a mobile station used in a single carrier communication system to which a VSCRF-CDMA system, an IFDMA system, or a DFT-spread OFDM system is applied, and uses a random access channel to a base station. Phase determining means for determining the phase of the comb-shaped spectrum of transmission data to be transmitted based on its own mobile station information, and multiplying the phase of the comb-shaped spectrum of transmission data by the phase determining means; Transmitting means for imparting time-axis randomness and frequency-axis randomness to a comb-like spectrum of transmission data is provided.

  The transmitter of the present invention also includes an encoding / spreading unit that encodes / spreads transmission data of a random access channel, a scramble code spreading unit that spreads an output from the encoding / spreading unit using a scramble code, and a scramble A chip repetition unit that generates a comb-like spectrum that has been repeated a predetermined number of times based on the output of the code spreading unit, and multiplies the output of the chip repetition unit by the phase to comb the transmission data of the random access channel The phase change unit that changes the phase of the shaped spectrum, and whether or not to receive at the destination base station when the comb-like spectrum of the transmission data of the random access channel that has been phase changed by the phase changing unit is transmitted to the base station A reception confirmation unit to confirm and a random access channel transmitted to the base station using a random access channel. The phase of the comb-shaped spectrum of the transmission data of the received data is determined based on its own mobile station information, supplied to the phase changing unit, and the tooth-shaped spectrum of the transmitted comb is transmitted based on the confirmation result from the reception confirmation unit. A RACH phase determining unit that determines the phase based on its own mobile station information different from the current one and supplies and outputs the phase to the phase changing unit when not received by the previous base station Features.

  According to the present invention, during uplink access from a mobile station to a base station, the comb tooth is related to the comb-shaped spectrum of transmission data transmitted from the mobile station to the base station using a random access channel. Each time a mobile spectrum is transmitted from a mobile station, the mobile station information of the mobile station that transmits the phase of the comb-like spectrum is used to determine the randomness of the random access channel. The possibility that the comb-like spectrum of the transmission data collides can be reduced.

  For users with high data priority, increasing the number of comb tooth spectrum transmissions for users with low data priority can substantially increase the number of random accesses. The access channel can be operated efficiently.

  For users with high data priority, increasing the number of comb teeth in the frequency domain in the frequency domain for users with low data priority will substantially increase the number of random accesses. Therefore, the random access channel can be efficiently operated.

  For users with high data priority, the comb power spectrum of the transmission data between users is increased by increasing the transmission power of the comb tooth spectrum for users with low data priority. As a result, the random access channel can be operated efficiently by reducing the chance of collision.

  Also, regarding the slot or block of the random access channel that transmits the comb-shaped spectrum, the randomness of the random access channel is further determined by determining the mobile station information of the mobile station that transmits the comb-shaped spectrum. This increases the possibility that the comb-shaped spectrum of transmission data between users will collide.

  That is, according to the present invention, random access is performed by determining the phase, the number of transmissions, or the transmission power of the comb tooth spectrum to be transmitted based on the mobile station information of the mobile station that transmits the comb tooth spectrum. Collisions between users about the comb-shaped spectrum of transmission data transmitted using the channel can be avoided.

  Further, by using the mobile station information to determine the phase of the comb-like spectrum, the number of transmissions, or the transmission power, it is possible to reduce broadcast information from the base station regarding the random access channel.

  First, in describing an embodiment of the present invention, an uplink system configuration from a mobile station to a base station assumed in the present invention will be described.

  1 and 2 are system configuration diagrams of uplink in a mobile communication system assumed in the present invention.

  As shown in FIG. 1, in the system assumed by the present invention, the uplink from each mobile station to the base station has a time width of a time width, that is, a transmission time interval (TTI: Transmission Time Interval). It has a partitioned system configuration. Each time slot is assigned to a control channel such as a traffic channel TCH for transmitting voice and data and a random access channel RACH used when a mobile station requests a traffic channel TCH from a base station. Yes. In the example shown in FIG. 1, the traffic channel TCH is assigned to several slots, while the random access channel RACH is assigned to one slot.

  In addition, as shown in FIG. 2, the communication between the mobile station and the base station uses a plurality of subcarriers, and slots from each of the plurality of mobile stations are frequency / time division multiplexed in units of blocks (chunks). It is designed to be performed in the configuration. The blocks of the random access channel RACH are arranged on predetermined subcarriers at predetermined intervals on the time axis, so that a plurality of mobile stations can simultaneously transmit transmission data to the base station in one block. . On the other hand, a block of the traffic channel TCH is assigned to each mobile station from the base station, and only the assigned mobile station can transmit voice and data by the block of the traffic channel TCH.

  Note that the random access channel RACH (random access slot or random access block) and the traffic channel TCH (traffic slot or traffic block) described above are the contention-based channel (CBCH: Contention-based Channel) studied in 3GPP, and Each corresponds to a schedule channel (SCH).

  1 and FIG. 2, the mobile station uses the random access channel shown in FIG. 2 as the comb-tooth spectrum of the transmission data (for example, signature) of the random access channel RACH shown in FIG. An embodiment of the present invention will be described by adapting to the case of transmitting to a base station using a channel RACH block.

[First Embodiment]
FIG. 3 is a block diagram of a mobile station according to an embodiment of the present invention.
The mobile station 11 includes an encoding / spreading unit 21, a scrambling unit 22, a multiplication unit 23, a chip repetition unit 24, a RACH phase control unit 25, a TCH phase control unit 26, a switching unit 27, a multiplication unit 28, a filter unit 29, a collision The generation detection unit 30 is provided.

  The encoding / spreading unit 21 encodes input transmission data of the random access channel RACH and traffic channel TCH using an encoding method such as turbo encoding, and performs spreading using a short code.

  The scramble unit 22 generates a scramble code assigned to the base station identified by the cell search.

  The multiplier 23 multiplies the encoded / spread transmission data output from the encoder / spreader 21 by the scramble code generated by the scrambler 22 and further spreads the scramble code.

  The chip repetition unit 24 generates a comb-like spectrum that is designated by the base station or has been repeated a predetermined CRF times.

  The RACH phase control unit 25 determines the phase of the comb-tooth spectrum on the random access channel RACH from the mobile station information of the mobile station 11 at the start of random access, and supplies it to the multiplication unit 28 via the switching unit 27. .

  The TCH phase control unit 26 is connected to a reception system of the mobile station 11 (not shown), stores phase information of the comb tooth spectrum used in the traffic channel TCH notified from the base station to the mobile station 11, and When transmitting transmission data of the traffic channel TCH from 11 to the base station, the phase of the stored phase information is supplied to the multiplication unit 28 via the switching unit 27.

  The switching unit 27 selectively multiplies the phase generated by the RACH phase control unit 25 or the TCH phase control unit 26 according to transmission of transmission data of the random access channel RACH or transmission data of the traffic channel TCH. 28. For this purpose, the switching unit 27 connects the RACH phase control unit 25 side when transmitting transmission data of the random access channel RACH and the TCH phase control unit 26 side when transmitting transmission data of the traffic channel TCH to the multiplication unit 28. It is configured to do. The switching unit 27 is configured to be initialized so that the RACH phase control unit 25 side is connected to the multiplication unit 28 when transmission of the random access channel RACH is started.

  The multiplication unit 28 multiplies the phase supplied via the switching unit 27 by the comb tooth spectrum of the transmission data generated by the chip repetition unit 24, and changes the spectrum position of the comb tooth spectrum.

  The filter unit 29 performs band control of the comb-shaped spectrum whose spectrum position is changed by the multiplication unit 28.

  The collision occurrence detection unit 30 uses a random access channel transmitted from another mobile station 11 for the comb-shaped spectrum of the transmission data of the random access channel RACH transmitted to the base station with the phase determined by the RACH phase control unit 25. The presence / absence of a collision with the comb-like spectrum of the RACH transmission data is detected and determined. The determination result by the collision occurrence detection unit 30 is supplied as control information to the RACH phase control unit 25, the TCH phase control unit 26, and the switching unit 27, respectively.

  For example, the collision occurrence detection unit 30 returns a response from the base station corresponding to the transmission of the comb-tooth spectrum of the transmission data of the random access channel RACH from the mobile station 11 from the reception system of the mobile station 11 (not shown). It is configured to receive supply of reception detection of a synchronization detection display signal (hereinafter referred to as Ack). In addition, each time the phase is determined by the RACH phase control unit 25, the collision occurrence detection unit 30 performs other movement if the Ack reception detection from the base station is not confirmed within a predetermined time range. When it is determined that a collision has occurred with the station 11 ′ on the random access channel RACH, and the reception detection of Ack from the base station is confirmed within a predetermined time range, the other mobile station 11 ′ The random access channel RACH does not collide with each other, that is, the base station receives the comb-like spectrum transmitted by the random access channel RACH.

  Next, mobile station information used for determining the phase of the comb-tooth spectrum of the transmission data of the random access channel RACH in the RACH phase control unit 25 described above will be described.

  The mobile station information used to determine the phase in the RACH phase control unit 25 includes a mobile station serial number, a manufacturing number IMEI (International Mobile Equipment Identity), a unique identifier number (Fixed identifier Number), and a mobile station number (Mobile Station). Identity; User Equipment Identity), mobile station class, user ID (User Identity), telephone number (Phone Number), quality of service (QoS), access class AC (Access Class), access service class ASC (Access Service Class) ) Information, USIM (Universal Subscriber Identity Module) card information, and the like.

  This mobile station information is specified by, for example, the base station and can be acquired by receiving a common control channel CCPCH (Common Control Physical Channel) or a dedicated control channel DPCCH (Dedicated Physical Control Channel) from the base station.

  In addition, the mobile station information is calculated in advance according to a calculation formula, a calculation algorithm, and the like determined in advance by the base station based on the mobile station information described above, and is received by the common control channel CCPCH or the dedicated control channel DPCCH. Random access grouping information of the mobile station by the base station, for example, incoming group #n information included in a paging indicator channel PICH (Page Indication Channel) such as the W-CDMA system may be used.

  And these mobile station information can be updated with a time change, or can be fixed regardless of a time change.

  Further, the access service class ASC information in the mobile station information is generated from the access class AC information. In this case, the access class AC is stored in the USIM card, used only for the first wireless access (such as RRC CONNECTION REQUEST), and then mapped to the access service class ASC (non-patent). References 4, 5, 6).

  Next, an algorithm for determining the phase of the comb-tooth spectrum of the transmission data of the random access channel RACH in the mobile station 11 described above will be described.

  In the description, for the sake of easy understanding, an example will be described in which the phase is determined based on three pieces of individual mobile station information such as a user ID, a quality of service QoS, and a mobile station class.

  However, the number of individual mobile station information to be actually used is not limited to three, and the type of individual mobile station information to be used is based on other individual mobile station information such as a telephone number. Good.

  FIG. 4 is a flowchart showing an algorithm for determining the phase of the comb-like spectrum according to this embodiment.

  When the mobile station 11 performs random access from the mobile station 11 to the base station using the random access channel RACH, the RACH phase control unit 25 of the mobile station 11 defines the phase of the comb tooth spectrum for the mobile station information provided therein. One phase is determined with reference to the station information / phase correspondence table 40 (step S401).

FIG. 5 is a diagram showing an example of the mobile station information / phase correspondence table.
The mobile station information / phase correspondence table 40 shown in FIG. 5 includes three individual correspondence tables 40-1 to 40-3 in which each individual mobile station information such as user ID, service quality QoS, and mobile station class corresponds to a phase. It has a configuration.

  In the case of the present embodiment, the RACH phase control unit 25 appropriately selects one individual correspondence table 40-m (in this case, m = 1 to 3), and selects the one individual correspondence table. The phase is determined based on 40-m individual mobile station information.

  Returning to FIG. 4, the mobile station 11 multiplies the comb-like spectrum generated by the chip repetition unit 24 by the phase determined by the RACH phase control unit 25 by the multiplication unit 28, and randomly passes through the filter unit 29. The comb-shaped spectrum of transmission data is transmitted to the base station via the access channel RACH (step S402).

  When the base station receives the transmission data of the random access channel RACH composed of comb-shaped spectrum from the mobile station 11, Ack is returned, and the mobile station 11 receives the Ack from this base station ( Step S403), and shifts to the transmission mode of the transmission data of the traffic channel TCH.

  In the mobile station 11 shown in FIG. 3, the shift to the transmission mode of communication data on the traffic channel TCH is performed by the collision occurrence detection unit 30 within the predetermined time range after the phase determination in step S401. This is done by supplying a non-collision determination result based on the reception detection confirmation. With the supply of the non-collision determination result from the collision occurrence detection unit 30, the RACH phase control unit 25 stops determining and supplying the phase, and the switching unit 27 switches the TCH phase control unit 26 side to the multiplication unit 28. Then, the TCH phase control unit 26 starts supplying the phase of the comb-like spectrum used in the traffic channel TCH previously notified and stored from the base station.

  However, when the mobile station 11 cannot detect the Ack from the base station due to a collision with another user or the like and the mobile station 11 does not receive the Ack from the base station (step S403), the mobile station 11 The control unit 25 determines the phase from the individual correspondence table 40-m ′ other than the individual correspondence table 40-m selected first in the mobile station information / phase table 40 (step S404).

  Re-determination of the phase by the RACH phase control unit 25 is performed in the mobile station 11 shown in FIG. 3 in the case where the Ack reception by the collision occurrence detection unit 30 is not performed within the predetermined time range after the phase determination in step S401. This is done by supplying a collision determination result based on the detection. With the supply of the collision determination from the collision occurrence detection unit 30, the RACH phase control unit 25 executes the processing described in step S404 described above, and the switching unit 27 connects the RACH phase control unit 25 side to the multiplication unit 28. The TCH phase control unit 26 does not yet start supplying the phase of the comb-like spectrum used in the traffic channel TCH.

  Therefore, the mobile station 11 multiplies the comb-like spectrum generated by the chip repetition unit 24 by the re-determined phase by the multiplication unit 28, and again through the filter unit 29, the random access channel RACH. The comb-tooth spectrum of the transmission data is transmitted (step S405).

  In response to this retransmission, when the mobile station 11 receives an Ack from the base station (step S406), the mobile station 11 shifts to the transmission mode of the transmission data of the traffic channel TCH, while this time again receives an Ack from the base station. Is not received (step S406), in the case of the present embodiment, the phase is determined from the remaining individual correspondence table 40-m ″ (step S407), and the transmission data comb of the random access channel RACH is again determined. Is transmitted (step S408).

  The mobile station 11 is configured to repeat the processing described in steps S401 to S408 until an Ack is received from the base station (steps S403, S406, and S409).

  In this case, the phase can be determined from the predetermined mobile station information / phase table 40 as shown in FIG. 5, or the mobile station information / phase table 40 having a different configuration. It can also be set as the structure determined using.

FIG. 6 is a diagram showing another embodiment of the mobile station information / phase correspondence table.
In this case, a reference phase is set for each mobile station in advance, and the phase for each mobile station is determined based on the reference phase based on the mobile station information / phase table 40 shown in FIG. To do.

  For example, the first phase determination is performed for the phase corresponding to the reference phase in the individual correspondence table 40-m of the mobile station information / phase table 40 (in the case of FIG. 6, + 2θ, + θ, A value obtained by adding or subtracting only one of 0, −θ, and −2θ) is determined as the phase, and the second and subsequent phases are determined with respect to the reference phase by the mobile station information / phase table 40. A value obtained by adding or subtracting the corresponding phase from the remaining individual correspondence table 40-m ′ is determined as the phase.

  The user ID shown in FIGS. 5 and 6 can be derived from other mobile station information such as a mobile station manufacturing number, a telephone number, or an ID assigned by a communication company.

  Furthermore, the RACH phase control unit 25 determines the phase by calculation each time using mathematical formulas, even if the mobile station information / phase table 40 as described in FIGS. 5 and 6 is not provided in advance. You can also

  A specific transmission state of the comb-tooth spectrum of the transmission data of the random access channel RACH by the mobile station 11 configured as described above will be described with reference to FIG.

  FIG. 7 is an explanatory diagram of a specific transmission state of the comb-tooth spectrum of the transmission data of the random access channel RACH by the mobile station described above, and FIG. 7A is an explanatory diagram when no collision occurs. FIG. 7B is an explanatory diagram when a collision occurs.

  Here, the mobile station 11 has the comb-tooth spectrum of the transmission data of the random access channel RACH transmitted to the base station in the order of the user ID for the first time, the quality of service QoS for the first time, and the mobile station class for the third time. The phase will be described as being determined using the individual correspondence tables 40-1 to 40-3 shown in FIG. In the example of the case where the collision shown in FIG. 7B occurs, the inter-user collision is expressed by overlapping and combing the comb-shaped spectrums.

  In the transmission state shown in FIG. 7A, the phases of the users USER1, 2, 3,... Are different from each other as α, β, γ,. A transmission state in which no spectrum collision occurs is shown.

  However, in the first transmission in the transmission state shown in FIG. 7 (b), since the phases of the users USER1, 2, and 3 are the same with each other, a comb tooth spectrum collision occurs in the random access channel block. The state is shown.

  That is, in the first transmission of the comb-tooth spectrum of the communication data of the random access channel RACH (random access transmission) by the mobile stations 11-1 to 11-3 of the respective users USER1, 2, 3 , 3 has a user ID tail of 1, the individual correspondence table 40-1 (user ID / phase correspondence table) for the user ID tail shown in FIG. This is because the phase determined by the RACH phase control units 25 of -1 to 11-3 is α, and the collision occurs with the same phase.

  The second random access transmission is performed by using the individual correspondence table (service quality information / phase correspondence table) 40-2 regarding the service quality QoS shown in FIG. 6 so that the service quality QoS of the user USER1 is UBR and that of the users USER2 and USER3. Assuming that the quality of service QoS is ABR, the comb-tooth spectrum of the phase α transmitted from the mobile station 11-1 of the user USER1 has the phase β transmitted from the other mobile stations 11-2 and 11-3. Collision does not occur with the comb-shaped spectrum, and the base station can identify and receive in the second random access transmission this time. As a result, when the base station identifies and receives the comb-like spectrum transmitted from the mobile station 11-1 of the user USER1, the base station returns an Ack to the mobile station 11-1 of the user USER1. As a result, the mobile station 11-1 of the user USER1 receives Ack from the base station, and shifts to a state in which data can be transmitted to the base station using the traffic channel TCH specified by the base station. It will be.

  On the other hand, since the service quality QoS is both ABR between the mobile stations 11-2 and 11-3, the user USER2 and 3 are in the same β phase of the comb teeth spectrum. Thus, this time, a state where a collision has occurred is shown.

  In the third random access transmission, the mobile station class of the user USER2 is assumed to be 2 and the movement of the user USER3 is assumed by the individual correspondence table (mobile station class information / phase correspondence table) 40-3 regarding the mobile station class shown in FIG. If the station class is 4, the phases of the comb-like spectra of the respective combs are γ and β, and no collision occurs between the mobile stations 11-1 and 11-2 of the users USER2 and USER3. It is shown that the Ack from each can be received.

  As described above, the mobile station 11 determines the phase at the time of random access transmission to the base station every time when a collision occurs with another mobile station 11 ′ and Ack from the base station cannot be received. For example, by re-determining the phase while replacing the individual correspondence table 40-m such as user ID, quality of service QoS, and mobile station class, randomness is expanded, and random access transmission collides with another mobile station 11 ′. The possibility of doing so can be reduced.

  Note that the algorithm for determining the phase of the comb-tooth spectrum of the transmission data of the random access channel RACH in the mobile station 11 of the present embodiment is not limited to the example described in FIG.

[Second Embodiment]
FIG. 8 is a configuration diagram of a mobile station according to the second embodiment of the present invention.
In the description, the same components as those of the mobile station 11 shown in FIG. 3 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the present embodiment, the mobile station 12 includes an encoding / spreading unit 21, a scrambling unit 22, a multiplication unit 23, an M-point FFT unit 71, a subcarrier mapping unit 72, an N-point IFFT unit 73, and RACH subcarrier control. Unit 74, TCH subcarrier control unit 75, switching unit 27, filter unit 29, and collision occurrence detection unit 30.

  The mobile station 12 of the present embodiment includes an M-point FFT unit 71, a subcarrier mapping unit 72, and an N-point IFFT unit 73 instead of the chip repetition unit 24 of the mobile station 11 shown in FIG. .

  Accordingly, a RACH subcarrier control unit 74 and a TCH subcarrier control unit 75 are provided instead of the RACH phase control unit 25 and the TCH phase control unit 26 of the mobile station 11 shown in FIG.

  The M-point FFT unit 71 further receives a scramble code obtained by multiplying the multiplier unit 23 by the encoded / spread transmission data output from the encoder / spreader unit 21 and the scramble code generated by the scramble unit. A spread data sequence is provided.

  The M-point FFT unit 71 performs an FFT process on the input data sequence, performs time / frequency conversion, and supplies a frequency data sequence including M symbols to the subcarrier mapping unit 72.

  The subcarrier mapping unit 72 is a frequency composed of M symbols from the M-point FFT unit 71 based on the subcarrier position information (phase information) supplied from the RACH subcarrier control unit 74 or the TCH subcarrier control unit 75. With respect to the data series, a zero signal is inserted at an appropriate position as described in FIG. 28, and a frequency data series consisting of M symbols is mapped onto a frequency data series consisting of N symbols (N> M). Is supplied to the N-point IFFT unit 73.

  The N-point IFFT unit 73 performs IFFT processing on the frequency data sequence composed of N symbols from the subcarrier mapping unit 72, and performs frequency / time conversion on the frequency data sequence composed of N symbols, as shown in FIG. A tooth-like spectrum is generated.

  The RACH subcarrier control unit 74 determines the phase (subcarrier position) of the comb-tooth spectrum in the random access channel RACH from the mobile station information of the mobile station 12 at the start of random access, and determines the determined phase information. The data is supplied to the subcarrier mapping unit 72 via the switching unit 27 and the mapping by the subcarrier mapping unit 72 is controlled.

  The TCH subcarrier control unit 75 is connected to a reception system of the mobile station 12 (not shown), and phase information (subcarrier position information) of comb tooth spectrum used in the traffic channel TCH notified from the base station to the mobile station 12. ) And transmitting the transmission data of the traffic channel TCH from the mobile station 12 to the base station, the phase (subcarrier position) of the stored phase information is transferred to the subcarrier mapping unit 72 via the switching unit 27. And the mapping by the subcarrier mapping unit 72 is controlled.

  The switching unit 27 adjusts the phase information generated by the RACH subcarrier control unit 74 or the TCH subcarrier control unit 75 in accordance with transmission of transmission data of the random access channel RACH or transmission data of the traffic channel TCH. The data is sent to the mapping unit 72. Therefore, the switching unit 27 performs subcarrier mapping on the RACH subcarrier control unit 74 side when transmitting random access channel RACH transmission data, and on the TCH subcarrier control unit 75 side when transmitting transmission data on the traffic channel TCH. The unit 72 is configured to be connected. The switching unit 27 is configured to be initialized so as to connect the RACH subcarrier control unit 74 side to the subcarrier mapping unit 72 when transmission of the random access channel RACH is started.

  In addition, in the case of the mobile station 12 of the present embodiment, the algorithm for determining the phase of the missing tooth spectrum as described with reference to FIG. 4 is executed in the same manner as in the case of the mobile station 11 described above.

  In that case, in place of the RACH phase control unit 25 and the TCH phase control unit 26 of the mobile station 11 shown in FIG. 3, the RACH subcarrier control unit 74 and the TCH subcarrier control unit 75 are transferred from the mobile station 12 to the base station. The phase of access (including the case of random access using the random access channel RACH in steps S401, S404, and S407) is determined, and instead of the chip repetition unit 24 of the mobile station 11, the M-point FFT unit 71, sub The carrier mapping unit 72 and the N-point IFFT unit 73 transmit the comb-shaped spectrum of transmission data for accessing the base station to the base station via the filter unit 29 (steps S402, S405, S408). In the case of transmitting a comb-shaped spectrum of transmission data to the base station using the random access channel RACH. ).

  Thereby, also in the case of the mobile station 12 of this Embodiment, the effect | action and effect similar to the case of the mobile station 11 mentioned above can be achieved.

[Third Embodiment]
Next, another embodiment of the algorithm for determining the phase of the comb-tooth spectrum of the transmission data of the random access channel RACH will be described as a third embodiment.

  In this embodiment, the configuration of the mobile station is the same as that of the mobile stations 11 and 12 of the above-described embodiment, for example, the first embodiment shown in FIG. Further, the mobile station information / transmission count correspondence table 41 is provided.

  FIG. 9 is a diagram showing a service quality / transmission count correspondence table as an example of the mobile station information / transmission count correspondence table.

  The service quality / transmission count correspondence table 41 as one embodiment of the mobile station information / transmission count correspondence table 41 shown in FIG. 9 corresponds to the service quality QoS as individual mobile station information and the transmission count of transmission data. It has a table structure.

  An algorithm for determining the phase of the comb-like spectrum using the mobile station 11 of the second embodiment further including the service quality / transmission count correspondence table 41 will be described with reference to FIG.

  FIG. 10 is a flowchart showing an algorithm for determining the phase of the comb-like spectrum according to this embodiment.

  In the present embodiment, when the mobile station 11 randomly accesses the base station, the RACH phase control unit 25 of the mobile station 11 first refers to the service quality / transmission count correspondence table 41 and the service quality QoS of the transmission data. Is determined as the maximum number of retransmissions (step S1001).

  Next, the RACH phase control unit 25 of the mobile station 11 refers to, for example, the mobile station information / phase correspondence table 40 in which the user ID, service quality QoS, mobile station class and phase correspond to each other shown in FIG. One phase is determined (step S1002). At that time, the RACH phase control unit 25 resets the value of the transmission number counter that counts the number of transmissions of the same transmission data provided therein.

  Then, the mobile station 11 multiplies the comb tooth-shaped spectrum generated by the chip repetition unit 24 by the phase determined by the RACH phase control unit 25 by the multiplication unit 28, and passes the random access channel RACH via the filter unit 29. The comb-shaped spectrum of the transmission data is transmitted to the base station (step S1003).

  When the mobile station 11 receives an Ack from the base station corresponding to the transmission of the transmission data of the current random access channel RACH to the base station (step S1004), the mobile station 11 shifts to a transmission mode of transmission data on the traffic channel TCH. .

  On the other hand, when the mobile station 11 cannot detect Ack from the base station due to a collision with another user or the like and the mobile station 11 does not receive the Ack from the base station (step S1004), the mobile station 11 Then, the RACH phase control unit 25 increments the value of the internal transmission number counter, and whether the transmission execution number based on the value of the transmission number counter has reached the maximum number of retransmissions determined by the execution of the process of step S1001. It is confirmed whether or not (step S1005).

  As a result of this confirmation, if the number of transmission executions has not yet reached the maximum number of retransmissions, the mobile station 11 executes again the processing of step S1003 and subsequent steps, and the comb-like spectrum of the transmission data of the random access channel RACH. Are transmitted in the same phase (step S1003). Therefore, until the Ack is received from the base station within the range of the maximum number of retransmissions, the transmission of the comb-shaped spectrum of the transmission data of the random access channel RACH from the mobile station 11 to the base station is the same. Repeatedly in phase.

  On the other hand, when the Ack is received from the base station within the range of the maximum number of retransmissions (step S1004), the mobile station 11 shifts to a transmission mode for transmission data on the traffic channel TCH.

  On the other hand, when the Ack is not received from the base station within the range of the maximum number of retransmissions in the transmission execution (step S1005), the mobile station 11 performs the transmission waiting period corresponding to the service quality QoS. Then, it waits for transmission of the random access channel RACH (step S1006), and after that standby, the processing after step S1002 is executed again, and the transmission of the random access channel RACH is repeatedly executed until Ack is received from the base station. .

  As an example of the transmission waiting period corresponding to the service quality QoS in this case, the number of transmissions corresponding to the service quality QoS of the mobile station 11 in the service quality / transmission count correspondence table 41 shown in FIG. / The number of times more than the difference from the maximum number of transmissions in the transmission number correspondence table 41 is used.

  In determining the phase shown in step S1002 after this transmission waiting period, as described with reference to FIG. 4 in the first embodiment, the individual correspondence table other than the individual correspondence table 40-m selected before that time. It is possible to determine the phase from 40-m ′.

  Furthermore, the determination of the maximum number of retransmissions described in step S1001 is not limited to determination based on the service quality QoS as individual mobile station information, but mobile station information / corresponding to other individual mobile station information / It is also possible to determine using the transmission count correspondence table 41 (for example, mobile station class / transmission count correspondence table).

  A specific transmission state of the comb-tooth spectrum of the random access channel RACH by the mobile station 11 configured as described above will be described with reference to FIG.

  FIG. 11 is an explanatory diagram of a specific transmission state of the comb-tooth spectrum of the transmission data of the random access channel RACH by the mobile station described above, and shows a case where a collision occurs.

  Here, the mobile station 11 has the comb-tooth spectrum of the transmission data of the random access channel RACH transmitted to the base station in the order of the user ID for the first time, the quality of service QoS for the first time, and the mobile station class for the third time. A description will be given assuming that the phase is determined using the mobile station information / phase table 40 shown in FIG.

  In the first transmission in the transmission state shown in FIG. 11, since the user USER 1, 2, 3 simultaneously transmits the comb tooth spectrums on the random access channel RACH, there is a collision of the comb tooth spectrums transmitted by each of them. The state is shown.

  That is, in this case, since the user IDs of the users USER1, 2, 3 are both 1, the individual correspondence table 40-1 relating to the user ID shown in FIG. This is because the phase determined by the RACH phase control unit 25 of the stations 11-1 to 11-3 is α, and the same phase occurs and a collision occurs.

  In this case, if the service quality QoS of the user USER1 is CBR, the service quality QoS of the user USER2 is nrt-VBR, and the service quality QoS of the user USER3 is UBR, the mobile station information / number of transmissions shown in FIG. Based on the service quality / transmission count correspondence table 41 as the correspondence table, the maximum retransmission count is 3 for the mobile station 11-1 of the user USER1 and the maximum retransmission count for the mobile station 11-2 of the user USER2. Two times, the mobile station 11-3 of the user USER3 is set by the respective RACH phase control units 25 as the maximum number of retransmissions. Therefore, in the example shown in FIG. 9, since the maximum number of transmissions in the service quality / transmission count correspondence table 41 is 3, the mobile station 11-1 of the user USER1 has a comb tooth shape on the random access channel RACH. The mobile station 11-2 of the user USER2 is retransmitted every time according to the transmission cycle of the spectrum, and after retransmitting twice according to the transmission cycle, the mobile station 11-3 of the user USER3 enters the transmission standby state. According to the transmission cycle, transmission is performed only once and then a transmission standby state is entered three times.

  As a result, in the second transmission in the transmission state shown in FIG. 11, the transmission of the comb-shaped spectrum on the random access channel RACH from the mobile station 11-3 of the user USER3 is suspended, and the collision is avoided. However, since the comb-tooth spectrum is retransmitted from the mobile stations 11-1 and 11-2 of the users USER1 and 2 on the random access channel RACH at the same phase α as the previous time, a collision occurs this time. Become.

  In the next third transmission, since the transmission of the comb-tooth spectrum on the random access channel RACH from the mobile stations 11-2 and 11-3 of the user USER2 and 3 is suspended, the collision is avoided, Since the comb-tooth spectrum of the random access channel RACH is retransmitted only from the mobile station 11-1 of the user USER1 with the same phase α as the previous time, even if it is the same phase α in the third retransmission, there is a collision this time. It does not occur and the base station can receive the identification. As a result, the mobile station 11-1 of the user USER1 receives Ack from the base station, and can transmit data to and from the base station using the traffic channel TCH specified by the base station.

  In the next transmission for the fourth time, the transmission of the comb-tooth spectrum on the random access channel RACH from the mobile station 11-3 of the user USER3 is still paused, so the mobile station of the user USER2 whose transmission standby state has been released From 11-2, this time, the comb-tooth spectrum of the random access channel RACH with the phase γ determined using the mobile station information / service quality of the phase table 40 / phase table 40-2 shown in FIG. Transmission is performed, and the base station can receive the identification. As a result, the mobile station 11-2 of the user USER2 receives Ack from the base station, and can transmit data to and from the base station using the traffic channel TCH specified by the base station.

  In the next fifth transmission, since the users USER1 and USER2 have already shifted to transmission using the traffic channel TCH designated by the base station, the mobile station 11-3 of the user USER3 whose transmission standby state has been released This time, the comb-tooth spectrum is transmitted on the random access channel RACH with the phase α determined using the mobile station information / service quality of the phase table 40 / phase table 40-2 shown in FIG. The base station can receive the identification. As a result, the mobile station 11-3 of the user USER3 receives Ack from the base station and can transmit data to and from the base station using the traffic channel TCH specified by the base station.

  According to the present embodiment, it is possible to operate the channel more efficiently by increasing the number of transmissions of random access transmission for users with high priority.

[Fourth Embodiment]
Next, as a fourth embodiment, an embodiment in which the phase of the comb tooth spectrum and the number of the comb tooth spectrum are determined based on the mobile station information and the base station is accessed will be described.

FIG. 12 is a configuration diagram of the mobile station in the present embodiment.
In the description, the same components as those of the mobile station 11 shown in FIG. 3 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the present embodiment, the mobile station 13 includes encoding / spreading units 21-1,..., 21-n, scrambling units 22-1, ..., 22-n, multiplication units 23-1, ..., 23-n, , 24-n, multiplication units 28-1,..., 28-n, filter unit 29, copy unit 31, RACH phase / comb tooth number determination unit 32, RACH phase determination unit 33- 1,..., 33 -n, TCH phase determination unit 34-1,..., 34 -n, phase control unit 35-1,..., 35 -n, composition unit 36, and base station reception detection unit 37 It has become.

  The copy unit 31 duplicates transmission data by the number of comb teeth determined by the RACH phase / comb tooth number determination unit 32, and encodes / spreads 21- of each transmission system 50-1,..., 50-n. 1,..., 21-n are supplied with the duplicated transmission data.

  The RACH phase / comb tooth number determination unit 32 generates a comb tooth-shaped spectrum generation number (hereinafter referred to as a comb tooth number) and basic phase information on the random access channel RACH at the start of random access transmission. Is determined from the mobile station information such as the mobile station number and service QoS, and the determined number of comb teeth k is supplied to the copy unit 31, and the determined basic phase of the comb spectrum corresponds to the number of comb teeth. Are supplied to the RACH phase determining units 33-1 to 33-k.

  Further, the RACH phase / comb tooth number determination unit 32 corresponds to the RACH phase control unit 25 of the mobile station 11 shown in FIG. 3 and, as described in the third embodiment, transmits the transmission data. The number of transmissions corresponding to the mobile station information is determined as the maximum number of retransmissions.

  Each of the RACH phase determination units 33-1 to 33-n further converts the basic phase of the comb-like spectrum supplied from the RACH phase / comb tooth number determination unit 32 and transmits the converted phase. The phase determined for the comb-like spectrum in the random access channel RACH is supplied to the corresponding phase control units 35-1,..., 35-n.

  Each of the RACH phase determination units 33-1,..., 33-n, when converting the basic phase of the comb-shaped spectrum, for example, in advance so that the mutually converted phases are shifted by a predetermined phase angle θ1. It is configured. For example, the RACH phase determination unit 33-1 outputs the basic phase determined by the RACH phase / comb tooth number determination unit 32 as it is, and the RACH phase determination unit 32-2 outputs the RACH phase / comb tooth number. The phase shifted by θ1 with respect to the basic phase determined by the number determining unit 32 is output as a determined phase, and the RACH phase determining unit 33-k is similarly configured to the RACH phase / comb tooth number determining unit 32. The phase shifted by kθ1 from the determined basic phase is output as the determined phase.

  Each of the TCH phase determination units 34-1 to 34-n corresponds to the TCH phase control unit 26 of the mobile station 11 shown in FIG. 3, and is also connected to the reception system of the mobile station 13 (not shown). The phase of the comb-shaped spectrum used in the traffic channel TCH notified from the base station to the mobile station 13 is stored, and the transmission data of the traffic channel TCH is transmitted from the mobile station 13 to the base station. The phase is supplied to the phase control units 35-1,..., 35-n.

  The phase control units 35-1, ..., 35-n correspond to the switching unit 27 of the mobile station 11 shown in FIG. 3, and the corresponding RACH phase determination units 33-1, ..., 33-n, or TCH phase determination. .., 34-n are selectively multiplied by the multipliers 28-1,..., 28 in accordance with the transmission of the transmission data of the random access channel RACH or the transmission data of the traffic channel TCH. Control supply to -n.

  The phase control units 35-1,..., 35-n supply the phase information supplied from the RACH phase determination units 33-1,..., 33-n to the multiplication unit 28 when transmitting the transmission data of the random access channel RACH. In this configuration, the transmission data of the traffic channel TCH is transmitted and supplied to the phase information multiplier 28 generated by the TCH phase determination units 34-1 to 34-n.

  The synthesizer 36 synthesizes the comb-like spectrum of the phase comb generated by the multipliers 28-1,..., 28-n.

  The base station reception detection unit 37 corresponds to the collision occurrence detection unit 30 of the mobile station 11 shown in FIG. 3 and transmits the random access channel RACH from the mobile station 13 from the reception system of the mobile station 13 (not shown). A predetermined time range is obtained after the reference phase is determined by the RACH phase / comb tooth number determination unit 32 in response to the reception detection of the Ack returned from the base station in response to the transmission of the comb-shaped spectrum of data. The reception at the base station regarding the comb-like spectrum of the transmission data of the random access channel RACH from the mobile station 13 is detected based on whether or not the reception detection of the Ack from the base station has been confirmed. The detection result by the base station reception detection unit 37 is supplied to the RACH phase / comb tooth number determination unit 32 and the phase control units 35-1,..., 35-n.

  Therefore, in the mobile station 13 of the present embodiment, the encoding / spreading unit 21, the scramble unit 22, the multiplication unit 23, and the chip repetition unit 24 in the configuration of the mobile station 11 of the first embodiment shown in FIG. , RACH phase control unit 25, TCH phase control unit 26, switching unit 27, multiplication unit 28, filter unit 29, and collision occurrence detection unit 30 are transmitted by RACH phase / comb tooth number determination unit 32. A plurality (50-1,..., 50-n) of the number of comb teeth determined is provided.

  Next, an algorithm for determining the phase information of the comb-tooth spectrum in the random access channel RACH in the mobile station 13 described above will be described.

  FIG. 13 is a flowchart showing an algorithm for determining the phase information of the comb-tooth spectrum according to the present embodiment.

  When performing random access from the mobile station 13 to the base station using the random access channel RACH, the RACH phase / comb tooth number determination unit 32 of the mobile station 13 is used as a mobile station information / tooth number information correspondence table provided therein. Referring to the service quality / tooth number correspondence table 41 shown in FIG. 9, the number of transmissions corresponding to the service quality QoS of the transmission data is determined as the maximum number of retransmissions (step S1301).

  Subsequently, the RACH phase / comb tooth number determination unit 32 refers to the mobile station information / tooth number correspondence table 42 that defines the number of teeth of the comb tooth spectrum for the mobile station information, which is also provided therein. Then, the number of teeth of the comb-shaped spectrum of the transmission data of the random access channel RACH is determined (step S1302).

FIG. 14 is a diagram showing an example of the mobile station information / teeth number correspondence table.
In the case of the mobile station information / teeth number information correspondence table 42 shown in FIG. 14, the table configuration is such that the service quality QoS as the individual mobile station information and the number of teeth of the comb tooth spectrum correspond to each other. In the case of the present embodiment, the RACH phase / comb tooth number determination unit 32 determines phase information based on the service quality / tooth number correspondence table 42 and supplies the determined number of teeth to the copy unit 31 as control information. To do.

  Subsequently, the RACH phase / comb tooth number determination unit 32 is also provided therein, and defines the reference phase of the comb tooth spectrum for mobile station information. For example, the user ID and service as shown in FIG. Referring to the mobile station information / phase correspondence table 40 having three individual correspondence tables 40-1 to 40-3 in which the individual mobile station information such as quality QoS and mobile station class correspond to the phases, one The phase is determined (step S1303).

  In this case, the RACH phase / comb tooth number determination unit 32 may select one individual correspondence table 40-m (in this case, m = 1 to 3) from among the three individual correspondence tables 40-1 to 40-3. ) Is appropriately selected, and the phase is determined based on the individual mobile station information of the selected individual correspondence table 40-m. At that time, the RACH phase / comb tooth number determination unit 32 also resets the value of the transmission number counter that counts the number of transmissions of the same transmission data provided therein.

  Further, the comb tooth number k determined by the RACH phase / comb tooth number determination unit 32 is supplied to the copy unit 31, and the copy unit 31 copies the transmission data by the determined comb tooth number k. The transmitted transmission data is supplied to the encoding / spreading units 21-1 to 21-k of the transmission systems 50-1 to 50-k for the number k of teeth in a predetermined order. .

  The reference phase determined by the RACH phase / comb tooth number determination unit 32 is the RACH phase determination unit 33-1 of the transmission systems 50-1 to 50-k for the number k of teeth in a predetermined order. To 33-k, respectively.

  At the beginning of random access transmission, the phase control unit 35 of each of the transmission systems 50-1 to 50-n multiplies the phases determined by the RACH phase determination units 33-1 to 33-n by the multiplication units 28-1 to 28-n. The transmission data of the random access channel RACH from the chip repeater 24 is transmitted to each of the transmission systems 50-1 to 50-k that have received the supply of the copy of the transmission data. The comb-shaped spectrum is multiplied by the phases determined by the RACH phase determining units 33-1 to 33-k by the multiplying units 28-1 to 28-k.

  As a result, in each of the transmission systems 50-1 to 50-k that are supplied with a copy of the transmission data described above, a comb-like spectrum is generated in which the spectrum position is changed at the phase in which the transmission data of the random access channel RACH is determined. These comb-shaped spectra are combined by the combining unit 36, band-limited by the filter unit 29, and then transmitted to the base station.

  Therefore, in this embodiment, the mobile station 13 uses the RACH phase determination units 33-1 to 33-k of the transmission systems 50-1 to 50-k to display the comb-like spectrum of the transmission data of the random access channel RACH. The frequency intervals are set apart from each other by the shifted phase interval θ1 and transmitted to the base station by the number k of comb teeth determined by the RACH phase / comb tooth number determination unit 32 (step S1304).

  In step S1304, the mobile station 13 transmits the comb-tooth spectrum of the transmission data of the random access channel RACH corresponding to the number of teeth k with a frequency interval of the phase interval θ1, and then the current random access channel RACH. When Ack is received from the base station corresponding to the transmission of the transmission data to the base station (step S1305), the mode shifts to the transmission data transmission mode on the traffic channel TCH.

  On the other hand, when the mobile station 13 cannot detect the Ack from the base station due to a collision with another user or the like and the mobile station 13 does not receive the Ack from the base station (step S1305), the mobile station 13 The RACH phase / comb tooth number determination unit 32 increments the value of the internal transmission number counter, and the maximum number of times of transmission indicated by the value of the transmission number counter is determined by executing the process of step S1301. It is confirmed whether or not the number of times has been reached (step S1306).

  As a result of this confirmation, if the number of transmission executions has not yet reached the maximum number of retransmissions, the mobile station 13 repeats the execution of the processing from step S1304 onwards.

  On the other hand, when the Ack is received from the base station within the range of the maximum number of retransmissions (step S1305), the mobile station 13 shifts to a transmission mode for transmission data on the traffic channel TCH.

  On the other hand, when the Ack is not received from the base station within the range of the maximum number of times of transmission (step S1306), the mobile station 13 executes the processing of step S1303 and subsequent steps again. Repeatedly until Ack is received from the station.

  A specific transmission state of the comb-tooth spectrum of the random access channel RACH by the mobile station 13 configured as described above will be described with reference to FIG.

  FIG. 15 is an explanatory diagram of a specific transmission state of the comb-tooth spectrum of the transmission data of the random access channel RACH by the mobile station described above, and FIG. 15A is an explanatory diagram when no collision occurs. FIG. 15B is an explanatory diagram when a collision occurs.

  Here, in the mobile station 13, the RACH phase / comb number of teeth determination unit 32 has a user ID for the first time, a quality of service QoS for the second time, and a RACH phase determination unit 33-1 for the third time in the order of the mobile station class. The reference phase to be supplied to ˜33-k will be described as being determined using the individual correspondence tables 40-1 to 40-3 of the mobile station information / phase correspondence table 40 shown in FIG. In this description, the maximum number of retransmissions determined by the RACH phase / comb tooth number determination unit 32 relates to mobile station information other than the quality of service QoS shown in FIG. In both cases, it is assumed that the maximum number of retransmissions is set to a value of 3 or more.

  In the transmission state shown in FIG. 15 (a), the user USER1, 2, 3 have mutually different reference phases from α, δ, ε, and a comb-like spectrum collision occurs in the random access channel block. Indicates no transmission status.

  Then, according to the service quality / tooth number correspondence table 41 shown in FIG. 9, the user USER1 has a service quality QoS of CBR and has three comb teeth. Therefore, in FIG. In this case, the comb teeth of phase α are accompanied by two comb teeth having a frequency interval corresponding to the phase interval θ1, and the transmission state is expressed by the comb-like spectrum of a total of three teeth. . Similarly, the user USER2 has a service quality Qos of rt-VBR and has two comb teeth. Therefore, in FIG. 15A, when the user ID end is 9, the total is based on the phase ε. When the transmission state of the tooth-shaped spectrum of the comb with two teeth is the user USER3 has a service quality Qos of UBR and one comb tooth, the user ID end is 5 in FIG. Is represented by the transmission state by a total of one comb-like spectrum based on the phase δ.

  On the other hand, in the transmission state shown in FIG. 15B, the conditions are different from those in FIG. 15A only at the end of the user ID, and the end of the user ID of each of the users USER1, 2, 3 is 1, 2, 2. It is represented by the transmission status in some cases.

  In this case, in the first transmission of the comb-tooth spectrum of the communication data of the random access channel RACH (random access transmission), the user USER1 has the user ID end of 1 and the service quality Qos is CBR. The transmission state is based on a total of three comb-like spectra with the phase α as a reference phase. Similarly, since the user USER2 has a user ID suffix of 2 and the quality of service Qos is rt-VBR, the user USER2 is in a transmission state with a total of two comb-shaped spectrums with the phase α as a reference phase. Further, since the user USER3 has a user ID suffix of 2 and the service quality Qos is UBR, the user USER3 is in a transmission state using a total of one comb-shaped spectrum with the phase α as a reference phase.

  Therefore, in the first random access transmission, the users USER1, 2, 3 have the same reference phase α, and therefore the transmission data of the random access channels RACH of the users USER1, 2, 3 in the reference phase α. As for the comb-like spectrum generated by multiplying the reference phase α, the collision occurs.

  However, in the mobile station 13 of the present embodiment, the mobile station 13-1 of the user USER1 is in the transmission state of the comb tooth-like spectrum in a total of three phases α, α + θ1, α + 2θ1 with the phase α as a reference phase. On the other hand, even though the mobile stations 13-2 and 13-3 of the user USER2 and 3 are based on the phase α, in the case of the user USER2, a total of two phases α and α + θ1 and in the case of the user USER3 With the phase α alone, the sums 2 and 1 of the comb teeth spectrums of the users USER2 and 3 are in a transmission state smaller than three, which is the sum of the comb teeth spectrum of the user USER1.

  Therefore, among the total three comb-shaped spectra transmitted from the mobile station 13-1 of the user USER 1 with the frequency interval different by the phase interval θ 1, even if the reference phase is the same phase α, the user A comb-like spectrum of a phase (in this case, phase α + 2θ1) that does not collide with the comb-like spectrum transmitted from each of the mobile stations 13-2 and 13-3 of USER2 and 3 appears. As a result, the non-collision comb-shaped spectrum transmitted from the mobile station 13-1 of the user USER1 is identified and received by the base station, and the mobile station 13-1 of the user USER1 transmits the first random access transmission. By receiving Ack from the base station, data can be transmitted to the base station using the traffic channel TCH designated by the base station.

  Hereinafter, for the same reason, the mobile station 13-2 of the user USER2 receives the Ack from the base station in the second random access transmission, and the mobile station 13-3 of the user USER3 receives the Ack from the base station in the third random access transmission. Using the traffic channel TCH specified by the base station, data can be transmitted to and from the base station.

FIG. 16 is a configuration diagram of a modification of the mobile station according to the present embodiment shown in FIG.
The mobile station 13 shown in FIG. 16 is a mobile station when the encoding / spreading unit 21 and the scramble unit 22 are minimized by eliminating the copy unit 31 of the mobile station 13 shown in FIG. . Since the configuration and operation of the mobile station 13 are the same as those of the mobile station 13 shown in FIG. 12, the corresponding components are denoted by the same reference numerals, and description thereof is omitted.

  According to the present embodiment, channel efficiency is further increased by increasing the number of comb teeth of the comb-like spectrum of the communication data of the random access channel RACH transmitted by random access transmission for high priority users. Operation is possible.

[Fifth Embodiment]
Next, as a fifth embodiment, another embodiment in which the phase of the comb tooth spectrum and the number of comb tooth spectrums are determined based on the mobile station information and the base station is accessed will be described.

  In the present embodiment, the configuration of the mobile station 13 is almost the same as the configuration of the third embodiment shown in FIG. 12 or FIG. 16, but is provided for each of the transmission systems 50-1 to 50-n. The RACH phase determination units 33-1 to 33-n are abolished, and instead the RACH phase / comb tooth number determination unit 32 determines the number of comb teeth k determined by the transmission system 50-1 to 50-k. , And the determined phases are respectively supplied to the phase control units 35-1,..., 35-k of the transmission systems 50-1 to 50-k corresponding to the number k of the comb teeth. .

  In this case, the RACH phase / comb number-of-teeth determination unit 32 determines the number k of teeth in the comb-shaped spectrum for the mobile station information provided therein, as in the mobile station 13 according to the third embodiment. Referring to the prescribed mobile station information / tooth number correspondence table 42, the number k of teeth in the comb-like spectrum of the transmission data of the random access channel RACH is determined.

  Note that the RACH phase / comb number-of-teeth determination unit 32 also corresponds to the service quality QoS shown in FIG. 14 and the number of teeth in the comb-shaped spectrum shown in FIG. The mobile station information / teeth number information correspondence table 42 will be used.

  In this embodiment, the RACH phase / comb tooth number determination unit 32 transmits the transmission systems 50-1 to 50- as shown in FIG. 5 based on the number k of teeth in the comb-shaped spectrum. Each of the comb-like spectrums of the combs having the number k of teeth determined with reference to the mobile station information / phase correspondence table 40 having a configuration having individual correspondence tables 40-1 to 40-n provided in correspondence with n The phase is determined. And each phase of each comb-like spectrum determined by the RACH phase / comb tooth number determination unit 32 is supplied to the corresponding phase control unit 35-1,..., 35-n.

  A specific transmission state of the comb-tooth spectrum of the random access channel RACH by the mobile station 13 configured as described above will be described with reference to FIG.

  FIG. 17 is an explanatory diagram of a specific transmission state of the comb-like spectrum of the transmission data of the random access channel RACH by the mobile station according to the present embodiment.

  The mobile station 13 shows the number of comb teeth in the comb-shaped spectrum transmitted by the RACH phase / comb number-of-tooth determination unit 32 from the preset service quality QoS of the mobile station 13 in FIG. The service quality / teeth number information correspondence table 42 is determined.

  In the example shown in FIG. 14, the service quality QoS of the users USER1, 2, and 3 is CBR, rt-VBR, and UBR, respectively. In the case shown in FIG. 17, the RACH phase and the number of comb teeth are determined. The unit 32 determines the number of comb teeth k as 3 for the user USER1, 2 for the user USER2, and 1 for the user USER3.

  When the mobile station 13 determines the number k of comb teeth, the mobile station 13 determines the phases of the corresponding transmission systems 50-1 to 50-k based on the determined number k of comb teeth. In the present embodiment, the individual correspondence of the mobile station information / phase correspondence table 40 shown in FIG. 5 that is referred to every determined number of comb teeth k, that is, for each of the transmission systems 50-1 to 50-k to be used. Tables 40-1 to 40-n are preset. In the case shown in FIG. 17, the mobile station 13 uses the RACH phase / comb tooth number determination unit 32 to determine the phase of the first comb tooth spectrum by using the user ID tail information / phase correspondence table 40-1. The phase of the second comb tooth spectrum is determined by the mobile station class / phase correspondence table 40-3, and the phase of the third comb tooth spectrum is determined by the service quality / phase correspondence table 40-2. It has become.

  Therefore, in the case shown in FIG. 17, since the user USER1 transmits three comb-shaped spectrums, the phase is determined by the user ID, the mobile station class, and the service quality Qos. α, γ, and ε. Similarly, the user USER2 sends out two comb-like spectrums, so that the phase is determined by the user ID and the mobile station class, so that the phases are α and ε, and the user USER3 has one phase. Since the comb-like spectrum is transmitted, the phase is α in order to determine the phase by the user ID.

  As a result, as shown in the first transmission in FIG. 17, the mobile stations 13-1, 13-2, and 13-3 of the users USER1, 2, and 3 simultaneously transmitted the comb-like spectrum on the random access channel RACH. In this case, the first comb-like spectrum of the phase α of each of the users USER1, 2 and 3 and the second comb-tooth spectrum of the phase ε of each of the users USER1 and 2 collide, but the phase of the user USER1 Since the third tooth-like spectrum of γ does not collide, the base station can detect the mobile station 13-1 of the user USER1. As a result, the mobile station 13-1 of the user USER1 receives Ack from the base station and starts transmitting data on the traffic channel TCH.

  As shown in the second transmission in FIG. 17, when the users USER2 and 3 that are not detected by the base station transmit again with the same phase, the first comb-like spectrum of the phase α of the user USER2 and 3 will collide. However, since the second comb tooth spectrum of the phase ε of the user USER2 does not collide, the mobile station 13-2 of the user USER2 receives the Ack from the base station, and starts transmitting data on the traffic channel TCH. Is done.

  As shown in the third transmission in FIG. 17, since the third transmission is performed only by the mobile station 13-3 of the user USER 3, the first comb-like spectrum of the phase α of the user USER 3 is the other user USER 1. , 2 no longer causes a comb-like spectrum collision, so that the mobile station 13-3 of the user USER2 receives the Ack from the base station and starts transmitting data on the traffic channel TCH.

  According to the present embodiment, it is possible to efficiently operate the channel by increasing the number of comb teeth to be transmitted to a user with high priority.

[Sixth Embodiment]
Next, as a sixth embodiment, the phase of the comb tooth spectrum is determined based on the mobile station information, and the transmission power control of the subcarriers transmitted by the comb tooth spectrum is performed to access the base station. An embodiment to be described will be described.

FIG. 18 is a configuration diagram of the mobile station in the present embodiment.
In the description, the same components as those of the mobile station 11 shown in FIG. 3 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the present embodiment, the mobile station 14 includes an encoding / spreading unit 21, a scramble unit 22, a multiplication unit 23, a chip repetition unit 24, a switching unit 27, a multiplication unit 28, a filter unit 29, a collision occurrence detection unit 30, and a RACH. A phase / power determination unit 61, a TCH phase / power determination unit 62, and a transmission control unit 63 are provided.

  The RACH phase / power determining unit 61 corresponds to the RACH phase control unit 25 of the mobile station 11 shown in FIG. 3 and corresponds to the mobile station information of the transmission data as described in the first embodiment. In addition, the phase of the comb-tooth spectrum of the transmission data of the random access channel RACH is determined, and the transmission power when the comb-tooth spectrum of the transmission data of the random access channel RACH is wirelessly output is determined.

  The TCH phase / power determination unit 62 corresponds to the TCH phase control unit 26 of the mobile station 11 shown in FIG. 3 and corresponds to the mobile station information of the transmission data as described in the first embodiment. In addition, the phase of the comb-tooth spectrum of the transmission data of the traffic channel TCH is determined, and further, the transmission power when the comb-tooth spectrum of the transmission data is wirelessly output by the traffic channel TCH is determined.

  The RACH phase / power determination unit 61 and the TCH phase / power determination unit 62 supply the determined phase to the multiplication unit 28 via the switching unit 27 and control the transmission of the determined magnitude of the power via the switching unit 27. It supplies to each part 63.

  The switching unit 27 sends to the multiplication unit 28 and the transmission control unit 63 the phase and power magnitude determined by the RACH phase / power determination unit 61 or the phase and power magnitude determined by the TCH phase / power determination unit 62. Either one is selectively supplied based on the output of the collision occurrence detection unit 30.

  The transmission control unit 63 determines the transmission power of the radio output in the uplink of the transmission data from the mobile station 14 to the base station, the magnitude of the power determined by the RACH phase / power determination unit 61 or the TCH phase / power determination unit 62 To control.

  Next, an algorithm for determining the phase and transmission power of the comb-tooth spectrum of the transmission data of the random access channel RACH in the mobile station 14 described above will be described.

  FIG. 19 is a flowchart showing an algorithm for determining the phase and transmission power of the comb-like spectrum according to the present embodiment.

  When performing random access from the mobile station 14 to the base station using the random access channel RACH, the RACH phase / power determination unit 61 uses the mobile station information / phase correspondence table 40 as shown in FIG. Referring to, for example, one phase is determined in the same manner as in the case of the RACH phase control unit 25 described in the first embodiment (step S1901).

  In the RACH phase / power determination unit 61, when transmitting transmission data of the random access channel RACH for the first time in the current random access, the power corresponding to the initial value of the transmission power of the radio output by the transmission control unit 63 is large. Is determined in advance.

  As a result, the mobile station 14 multiplies the comb-shaped spectrum generated by the chip repetition unit 24 by the phase determined by the RACH phase / power determination unit 61 by the multiplication unit 28, and randomly passes through the filter unit 29. The comb-shaped spectrum of the transmission data of the access channel RACH is transmitted to the base station through the transmission control unit 63 with the transmission power of the magnitude determined by the RACH phase / power determination unit 61 (step S1902). .

  When the mobile station 14 receives an Ack from the base station for the comb-shaped spectrum transmission of the transmission data of the random access channel RACH (step S1903), the mobile station 14 transmits the transmission data of the traffic channel TCH. If the Ack is not received from the base station (step S1903) while shifting to the mode (step S1903), in the case of the present embodiment, the power level determined by the RACH phase / power determination unit 61 for the current transmission is, for example, The power is determined again to be larger by a predetermined amount (step S1904).

  The mobile station 14 is configured to repeat the processing described in steps S1901 to S1904 until an Ack is received from the base station (step S1903). In this case, a predetermined limit value is provided for the magnitude of power determined by the RACH phase / power determination unit 61, and the mobile station 14 may be unable to repeatedly receive Ack from the base station. The RACH phase / power determining unit 61 may be configured not to determine the amount of power exceeding the limit value.

  A specific transmission state of the comb-tooth spectrum of the transmission data of the random access channel RACH by the mobile station 14 configured as described above will be described with reference to FIG.

  FIG. 20 is an explanatory diagram of a specific transmission state of the comb-tooth spectrum of transmission data of the random access channel RACH by the mobile station according to the present embodiment.

  Here, each time the mobile station 14 has its RACH phase / power determination unit 61 transmit the comb-like spectrum on the random access channel RACH, the first time is the user ID, the second is the quality of service QoS, and the third is The phases supplied to the multiplication unit 28 in the order of the mobile station class are determined using the individual correspondence tables 40-1 to 40-3 of the mobile station information / phase correspondence table 40 shown in FIG. In the following description, it is determined that the power is larger in the second time than in the second time and in the third time than the second time.

  As shown in the first transmission in FIG. 20, when the mobile stations 14-1 and 14-2 of the users USER 1 and 2 transmit comb teeth spectrum simultaneously on the random access channel RACH, the users USER 1 and 2, respectively, If the user IDs end with the same number 1, the phases of the comb-shaped spectrums of the respective random access channels RACH are both α. For this reason, in this first transmission, there is a collision between comb teeth spectrums on the random access channels RACH of the users USER1 and 2, and the base station has comb teeth of the users USER1 and 2 on the random access channel RACH. The spectrum cannot be detected.

  In the second transmission shown in FIG. 20, both the users USER1 and 2 are the second transmission, and if the service QoS of the user USER1 is UBR and the service QoS of the user USER2 is nrt-VBR, the phase of the user USER1 is α The phase of the user USER2 is γ, and both transmit with the transmission power increased from the first time.

  When the user USER3 newly starts transmitting a comb-tooth spectrum on the random access channel RACH at the same timing as the transmission of the second comb-tooth spectrum by the users USER1 and 2 on the random access channel RACH. Is assumed.

  In this case, if the user USER3 performs the first transmission and the user ID end is 6, the phase of the comb-like spectrum in the random access channel RACH is γ.

  Therefore, in the second transmission shown in FIG. 20, since the second phase of the user USER1 is α, the second phase γ of the comb-like spectrum of the user USER2 and the first phase γ of the user USER3 Therefore, the base station can detect the mobile station 14-1 of the user USER1. As a result, the mobile station 14-1 of the user USER1 receives Ack from the base station and starts transmitting data on the traffic channel TCH.

  Further, in the second transmission shown in FIG. 20, the second comb tooth spectrum of the user USER2 is the same as the first phase γ of the user USER3. A collision will occur between the spectrum and the first comb-like spectrum of user USER3. However, in this case, assuming that the distance relationship between the two base stations is the same, the transmission power of the comb tooth spectrum of the user USER2 is larger than the power of the comb tooth spectrum of the user USER3. The station can detect the mobile station 13-2 of the user USER2. As a result, the mobile station 14-2 of the user USER2 also receives Ack from the base station and starts transmission of data on the traffic channel TCH.

  In contrast, the first transmission power of the comb tooth spectrum of the user USER3 is lower than the transmission power of the comb tooth spectrum of the user USER2 that has caused the collision. The comb-like spectrum is difficult to detect by the base station.

  In the third transmission shown in FIG. 20, assuming that the service QoS is ABR, the phase becomes β in the third transmission of the comb-shaped spectrum, but the other users USER1 and 2 have already been transmitted. Since it is detected by the base station and shifts to the transmission mode of the traffic channel TCH and is transmitted only to the mobile station 14-3 of the user USER3, no comb tooth spectrum collision occurs. Further, the second transmission power of the comb-like spectrum is larger than the first transmission power. Therefore, the mobile station 14-3 of the user USER2 also receives Ack from the base station and starts transmitting data on the traffic channel TCH.

  According to the present embodiment, by gradually increasing the transmission power according to the number of repeated transmissions of the comb-tooth spectrum on the random access channel RACH, an opportunity to communicate fairly with the base station is provided. . Moreover, a communication opportunity can be given also to the user who is far from the base station.

  Here, in the first to sixth embodiments described above, the method for determining the phase, the number of comb teeth, the transmission power, etc. in the random access channel RACH has been shown. The first to sixth embodiments It is also possible to combine the embodiments as appropriate.

[Seventh Embodiment]
In the first to sixth embodiments described above, the method for determining the phase, the number of comb teeth, the transmission power, etc. in the random access channel RACH has been described. For the comb-shaped spectrum of transmission data transmitted to the base station via the access channel RACH, the mobile station selects a random access channel slot (block) of the random access channel RACH used for transmission from its own mobile station information, It is also possible to transmit the comb-shaped spectrum of transmission data to the base station using the selected random access channel slot. The specific configuration and procedure will be described with reference to the drawings.

  First, an example of an uplink system used for access from a mobile station to a base station, which is employed in the present embodiment, will be described.

FIG. 21 is an explanatory diagram of an example of an uplink system from a mobile station to a base station.
As shown in FIG. 21, in the communication from the mobile station to the base station, the communication band from the mobile station to the base station is further divided into a plurality of frequency bands (frequency channels), and the sequence in the time direction of each frequency band is fixed. This is done in units of slots that are partitioned by time width. The slot sequence in the time direction of each frequency band is managed in units of frames, and one frame has a configuration in which a predetermined number of slots are continuously arranged in the time direction.

  In an uplink system from a mobile station to a base station having such a configuration, a random access channel RACH includes a predetermined slot in a frame on a sequence in a time direction of a predetermined frequency band as a random access channel slot ( Hereinafter, it is assigned as a RACH slot).

  As a result, in the uplink system as shown in FIG. 21, if the frame timing is synchronized, each RACH slot of each frame can be easily identified.

  For the traffic channel TCH, slots other than the RACH slot are used as traffic channel slots (hereinafter referred to as TCH slots).

  Hereinafter, in the description of the present embodiment, numbers 1 to N as shown in FIG. 21 are assigned to each of a plurality of RACH slots provided in units of frames from the top of the frame to identify each of the plurality of RACH slots. The explanation will be made after such convenience.

FIG. 22 is a configuration diagram of the mobile station in the present embodiment.
In the description, the same components as those of the mobile station 11 shown in FIG. 3 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the present embodiment, the mobile station 15 includes an encoding / spreading unit 21, a scramble unit 22, a multiplication unit 23, a chip repetition unit 24, a switching unit 27, a multiplication unit 28, a filter unit 29, a collision occurrence detection unit 30, and a RACH. A phase / slot determination unit 65, a TCH phase / slot / determination unit 66, and a transmission control unit 63 are provided.

  The RACH phase / slot determination unit 65 corresponds to the RACH phase control unit 25 of the mobile station 11 shown in FIG. 3, and corresponds to the mobile station information of the transmission data as described in the first embodiment. When determining the phase of the comb-tooth spectrum of the transmission data of the random access channel RACH and wirelessly transmitting the comb-tooth spectrum of the transmission data of the random access channel RACH to the base station, this comb-tooth spectrum To determine an access slot in the RACH slot in the uplink system that transmits.

  The TCH phase / slot determination unit 66 corresponds to the TCH phase control unit 26 of the mobile station 11 shown in FIG. 3 and corresponds to the mobile station information of the transmission data as described in the first embodiment. The phase of the comb-tooth spectrum of the transmission data of the traffic channel TCH is determined, and the comb-tooth spectrum when the comb-tooth spectrum of the transmission data of the traffic channel TCH is wirelessly transmitted to the base station is transmitted. An access slot in the TCH slot in the uplink system is determined.

  The RACH phase / slot determination unit 65 and the TCH phase / slot determination unit 66 supply the determined phase to the multiplication unit 28 via the switching unit 27, and the determined access slot in the uplink system via the switching unit 27. Each is supplied to the transmission control unit 63.

  The switching unit 27 gives the multiplication unit 28 and the transmission control unit 63 either the phase and access slot determined by the RACH phase / slot determination unit 65 or the phase and access slot determined by the TCH phase / slot determination unit 66. It supplies selectively based on the output of the collision detection part 30.

  Unlike the above-described fifth embodiment, the transmission control unit 63 has a desired value determined by the RACH phase / slot determination unit 65 or the TCH phase / slot determination unit 66 that is selectively supplied via the switching unit 27. A comb-tooth spectrum of the random access channel RACH or the traffic channel TCH is transmitted in accordance with the access slot.

  Next, in the mobile station 15 described above, the phase of the comb-tooth spectrum of the transmission data of the random access channel RACH and the access slot of the RACH slot that transmits this comb-tooth spectrum are moved by the mobile station 15 itself. An algorithm determined from station information (for example, user ID, service QoS, mobile station class) will be described.

  FIG. 23 is a flowchart showing an algorithm for determining the phase and access slot of the comb-tooth spectrum according to the present embodiment.

  When performing random access from the mobile station 15 to the base station using the random access channel RACH, the RACH phase / slot determination unit 65 of the mobile station 15 includes the uplink system for the mobile station information shown in FIG. An access slot in the RACH slot is determined with reference to the mobile station information / slot correspondence table 43 that defines the RACH slot in the frame (step S2301).

FIG. 24 is a diagram showing an example of the mobile station information / slot correspondence table.
The mobile station information / slot correspondence table 43 shown in FIG. 24 includes three individual mobile station information such as user ID, quality of service QoS, mobile station class, and corresponding individual access slots in the RACH slot in the frame. The correspondence table 43-1 to 43-3 is provided.

  In the case of the present embodiment, the RACH phase / slot determining unit 65 selects one individual correspondence table 43 from among the three individual correspondence tables 43-1 to 43-3 of the mobile station information / slot correspondence table 43 shown in FIG. -j (j = 1 to 3 in this case) is appropriately selected, and an access slot in the RACH slot is determined based on the individual mobile station information of the selected individual correspondence table 40-j.

  For example, as the selected individual correspondence table 40-j, the user ID / slot correspondence table 43-1 shown in FIG. 24, the service quality / slot correspondence table 43-2, the mobile station class / slot correspondence table 43-2, Among them, when the user ID / slot correspondence table 43-1 is selected and the user ID end of the mobile station 15 is 3, the RACH phase / slot deciding unit 65 determines that the intraframe of the uplink system shown in FIG. In the figure, RACH slots numbered 2, 7,..., N-3 are determined as access slots.

  The RACH phase / slot deciding unit 65 decides one phase with reference to the mobile station information / phase correspondence table 40 that defines the phase of the comb tooth spectrum with respect to the mobile station information as well as the access slot. (Step S2302).

  In the case of the present embodiment, the RACH phase / slot deciding unit 65 selects one individual correspondence table 40 from among the three individual correspondence tables 40-1 to 40-3 of the mobile station information / phase correspondence table 40 shown in FIG. -m (however, m = 1 to 3 in this case) is appropriately selected, and the phase is determined based on the individual mobile station information of the selected individual correspondence table 40-m.

  In the present embodiment, RACH phase / slot determination unit 65 selects one individual correspondence table 43-j, 40-m for random access transmission, and selects this individual correspondence table 43-j, 40-m. When the access slot and phase are determined again after the access slot and phase are determined based on the random access transmission, one individual correspondence table 43-j ′, 40-m is selected from the remaining individual correspondence tables. 'Is selected, and the access slot and phase are determined based on the individual correspondence tables 43-j' and 40-m '.

  The combination of the mobile station information of the individual correspondence table 40-m of the mobile station information / phase correspondence table 40 and the individual correspondence table 40-j of the mobile station information / slot correspondence table 43 to be selected is arbitrary. .

  Returning to FIG. 23, the mobile station 15 multiplies the comb tooth-like spectrum generated by the chip repetition unit 24 by the phase determined by the RACH phase / slot determination unit 65 by the multiplication unit 28, and passes through the filter unit 29. , Supplied to the transmission control unit 63.

  In the present embodiment, the transmission control unit 63 uses the desired access slot determined by the RACH phase / slot determination unit 65 that is selectively supplied via the switching unit 27 to transmit the transmission data of the random access channel RACH. A comb-like spectrum multiplied by the phase is transmitted (step S2303). For example, when RACH slots numbered 2, 7,..., N-3 in the frame shown in FIG. 21 are supplied as determined access slots, .., N-3 is used to transmit a comb-like spectrum multiplied by the phase of the transmission data of the random access channel RACH using the RACH slot numbered N-3.

  When receiving the Ack from the base station (step S2304), the mobile station 15 shifts to the transmission mode of the transmission data of the traffic channel TCH.

  In the mobile station 15 shown in FIG. 22, the transition to the transmission mode of the communication data on the traffic channel TCH is performed by supplying the non-collision determination result by the collision occurrence detection unit 30. The RACH phase / slot determination unit 65 stops determining and supplying the phase and the access slot by supplying the non-collision determination result from the collision occurrence detection unit 30, and the switching unit 27 switches the TCH phase / slot determination unit 66. Are switched to the multiplier 28 and the transmission controller 63, the phase and access slot determination by the TCH phase / slot determining unit 66 is started, and the phase and access slot determined by the TCH phase / slot determining unit 66 are The data is supplied to the multiplication unit 28 and the transmission control unit 63 via the switching unit 27.

  However, when the mobile station 15 cannot detect the Ack from the base station due to a collision with another user or the like and the mobile station 15 does not receive the Ack from the base station (step S2304), the mobile station 15 / The slot determination unit 65 determines the phase from the individual correspondence table 40-m ′ other than the individual correspondence table 40-m selected first in the mobile station information / phase table 40 (step S2305).

  The determination of the phase by the RACH phase / slot determination unit 65 is performed by supplying the collision determination result by the collision occurrence detection unit 30 in the mobile station 15 shown in FIG. The RACH phase / slot determination unit 65 executes the processing described in step S2305 described above by the supply of the collision determination from the collision occurrence detection unit 30, and the switching unit 27 multiplies the RACH phase / slot determination unit 65 side. The TCH phase / slot determination unit 66 does not yet start supplying the phase of the comb-shaped spectrum and the access slot used in the traffic channel TCH.

  Therefore, the mobile station 15 multiplies the comb-toothed spectrum generated by the chip repetition unit 24 by the re-determined phase by the multiplication unit 28 and supplies it to the transmission control unit 63 via the filter unit 29. Is done. In the next frame, transmission control unit 63 uses the same access slot (block) previously determined by RACH phase / slot determination unit 65 to retransmit the comb-shaped spectrum of transmission data of random access channel RACH ( Step S2306).

  In response to this retransmission, when the mobile station 15 receives an Ack from the base station (step S2307), the mobile station 15 shifts to the transmission mode of the transmission data of the traffic channel TCH, while this time also receives an Ack from the base station. Is not received (step S2307), in the case of this embodiment, the phase is determined from the remaining one individual correspondence table 40-m ″ (step S2308), and the transmission data comb of the random access channel RACH is again determined. Is transmitted using the same access slot (block) determined the previous time (step S2309).

  In response to this re-transmission, when the mobile station 15 receives an Ack from the base station (step S2310), the mobile station 15 shifts to the transmission mode of the transmission data of the traffic channel TCH, while this time also receives an Ack from the base station. Is not received (step S2310), the process returns to step S2301, and the mobile station 15 begins with the first of the three individual correspondence tables 43-1 to 43-3 of the mobile station information / slot correspondence table 43 shown in FIG. The phase is determined from the individual correspondence table 40-j ′ other than the selected individual correspondence table 40-j, and the processing from step S2302 is performed.

  The mobile station 15 is configured to repeat the processing described in steps S2301 to S2309 described above until an Ack is received from the base station (steps S2304, S2307, S2309).

  In this embodiment, as shown in steps S2302, S2305, and S2308, the phase is determined every time the comb-shaped spectrum is transmitted, and the access slot is determined in step S2301 by the mobile station information / phase table. The 40 individual correspondence tables 40-1 to 40-3 are configured for each use, but conversely, the access slot is determined each time the comb-shaped spectrum is transmitted, and the phase is determined as follows: The mobile station information / slot table 43 may be configured to be used each time the individual correspondence tables 43-1 to 43-3 are used. Further, both the determination of the phase and the determination of the access slot may be performed every time the comb-shaped spectrum is transmitted.

  According to the present embodiment, the random access channel RACH slot also has randomness, so that not only the frequency domain randomness by the phase control of the comb-tooth spectrum but also the time and frequency domain by the access slot Randomness is added and collision between users is less likely to occur.

  Furthermore, the present invention described based on each of the above embodiments is the configuration shown in each of the above embodiments, such as the position of subcarriers, the number of subcarriers, transmission power, etc. even when OFDMA is applied to the uplink. As well as methods.

FIG. 2 is a system configuration diagram of uplink from each mobile station to a base station in the mobile communication system assumed in the present invention. 1 is an overall configuration diagram of an uplink system in a mobile communication system assumed in the present invention. 1 is a configuration diagram of a mobile station according to a first embodiment of the present invention. It is a flowchart which shows the algorithm which determines the phase of a comb-tooth shaped spectrum. It is the figure which showed one Example of the mobile station information / phase information correspondence table. It is the figure which showed another Example of the mobile station information / phase correspondence table. It is explanatory drawing of the concrete transmission state of the comb-tooth spectrum of the transmission data of the random access channel RACH by the mobile station of this Embodiment. It is a block diagram of the mobile station by the 2nd Embodiment of this invention. It is the block diagram which showed one Example of the mobile station information / transmission frequency corresponding | compatible table in the mobile station by the 3rd Embodiment of this invention. It is a flowchart which shows the algorithm which determines the phase of a comb-tooth shaped spectrum. It is explanatory drawing of the specific state of the comb-tooth spectrum of the transmission data of the random access channel RACH by the mobile station of this Embodiment. It is a block diagram of the mobile station by the 4th Embodiment of this invention. It is a flowchart which shows the algorithm which determines the phase of a comb-tooth shaped spectrum. It is the figure which showed one Example of the mobile station information / teeth number correspondence table. It is explanatory drawing of the concrete transmission state of the comb-tooth spectrum of the transmission data of the random access channel RACH by the mobile station of this Embodiment. It is a block diagram of the modification of the mobile station by the 4th Embodiment of this invention. It is explanatory drawing of the concrete transmission state of the comb-tooth spectrum of the transmission data of the random access channel RACH in the mobile station by the 5th Embodiment of this invention. It is a block diagram of the mobile station as the 6th Embodiment of this invention. It is a flowchart which shows the algorithm which determines the phase and transmission power of a comb-tooth shaped spectrum. It is explanatory drawing of the concrete transmission state of the comb-tooth spectrum of the transmission data of the random access channel RACH by the mobile station of this Embodiment. It is explanatory drawing of the system example of the uplink from a mobile station to a base station. It is a block diagram of the mobile station by the 7th Embodiment of this invention. FIG. 6 is a flowchart illustrating an algorithm for determining the phase and access slot of a comb tooth spectrum. It is the figure which showed one Example of the mobile station information / slot correspondence table. It is explanatory drawing of the access method of the uplink of a W-CDMA system. It is explanatory drawing of the access method of the uplink of a VSCRF-CDMA system. It is a block diagram of the transmission side by a DFT-spread OFDM system. It is explanatory drawing of a DFT-spread OFDM system.

Explanation of symbols

11, 12, 13, 14, 15 Mobile station 21 Encoding / spreading unit 22 Scramble unit 23 Multiplying unit 24 Chip repetition unit 25 RACH phase control unit 26 TCH phase control unit 27 Switching unit 28 Multiplying unit 29 Filter unit 30 Collision detection Unit 31 copy unit 32 RACH phase / comb tooth number determination unit 33 RACH phase determination unit 34 TCH phase determination unit 35 phase control unit 36 combining unit 37 base station reception detection unit 40 mobile station information / phase correspondence table 41 mobile station information / Transmission number correspondence table 42 Mobile station information / number of teeth correspondence table 43 Mobile station information / slot correspondence table 50 Transmission system 61 RACH phase / power determination unit 62 TCH phase / power determination unit 63 Transmission control unit 65 RACH phase / slot determination unit 66 TCH phase / slot determination unit 71 M-point FFT unit 7 2 Subcarrier mapping unit 73 N-point IFFT unit 74 RACH subcarrier control unit 75 TCH subcarrier control unit

Claims (8)

An uplink random access method in which a plurality of mobile stations can simultaneously access one base station using a random access channel in a communication system employing a single carrier communication method,
A transmission method determination step for determining a transmission method of a comb-tooth spectrum of transmission data to be transmitted from the mobile station to the base station based on its own mobile station information;
A transmission step of transmitting a comb-tooth spectrum of transmission data to be transmitted from the mobile station to the base station using a random access channel in the transmission scheme determined in the transmission scheme determination step;
An uplink random access method characterized by comprising: An uplink random access method in which a plurality of mobile stations can simultaneously access one base station using a random access channel in a communication system employing a single carrier communication method,
A transmission method determination step for determining a transmission method of a comb-tooth spectrum of transmission data to be transmitted from the mobile station to the base station based on its own mobile station information;
A transmission step of transmitting a comb-tooth spectrum of transmission data to be transmitted from the mobile station to the base station using a random access channel in the transmission scheme determined in the transmission scheme determination step;
A reception confirmation step for confirming whether or not reception is possible in the base station of the transmission destination when transmitting the comb-tooth spectrum of the transmission data of the random access channel transmitted from the mobile station to the base station in the transmission step;
When reception at the base station is confirmed by the reception confirmation step, the communication shifts from communication using the random access channel to communication using the traffic channel, while when it is confirmed that the reception is not received at the base station. The repetition step of executing the transmission method determination step and the transmission step using own mobile station information different from this time,
An uplink random access method characterized by comprising: The transmission method determining step is a phase determining step for determining a phase of a comb-like spectrum of transmission data transmitted from the mobile station to the base station,
The transmission step is a phase change step in which a comb-tooth spectrum of transmission data transmitted from a mobile station to a base station is multiplied by the phase determined in the phase determination step and transmitted. The uplink random access method according to 2. The transmission method determining step is a phase / comb tooth number determining step for determining the phase of the comb tooth spectrum and the number of comb teeth of transmission data transmitted from the mobile station to the base station,
The transmission step multiplies the comb-tooth spectrum of the transmission data transmitted from the mobile station to the base station by the phase determined in the phase / comb teeth number determination step, and transmits the determined number of comb teeth. The uplink random access method according to claim 1, wherein the method is a change / comb number of teeth generation step. The transmission method determination step is a phase / transmission power determination step for determining the phase and transmission power of the comb-shaped spectrum of transmission data transmitted from the mobile station to the base station,
In the transmission step, the comb-tooth spectrum of transmission data transmitted from the mobile station to the base station is multiplied by the phase determined in the phase / comb tooth number determination step, and the phase change / transmission is performed with the determined transmission power. The uplink random access method according to claim 1, wherein the uplink random access method is a transmission power adjustment step. The transmission method determining step is a phase / slot determining step for determining a phase of a comb-tooth spectrum of transmission data transmitted from a mobile station to a base station and a slot of a random access channel used for transmission.
In the transmission step, the comb-tooth spectrum of transmission data transmitted from the mobile station to the base station is multiplied by the phase determined in the phase / comb tooth number determination step, and assigned to the determined random access channel slot. The uplink random access method according to claim 1 or 2, wherein the phase change / slot allocation step for transmission is performed. A mobile station used in a communication system applying a single carrier communication scheme to the uplink,
Phase determining means for determining the phase of the comb-shaped spectrum of transmission data to be transmitted using a random access channel to the base station based on its own mobile station information;
Transmission means for multiplying the comb-shaped spectrum of the transmission data by the phase determined by the phase determining means, and imparting the randomness of the time axis and the randomness of the frequency axis to the comb-shaped spectrum of the transmission data. A mobile station characterized by comprising. An encoding / spreading unit that encodes / spreads the transmission data of the random access channel;
A scramble code spreading unit for spreading the output from the encoding / spreading unit with a scramble code;
A chip repetition unit that generates a comb-like spectrum that has been repeated a predetermined number of times based on the output of the scramble code spreading unit;
A phase changing unit that multiplies the output of the chip repetition unit by a phase and changes the phase of the comb-like spectrum of the transmission data of the random access channel;
A reception confirmation unit for confirming whether or not reception is possible at the base station of the transmission destination when transmitting the comb-tooth spectrum of the transmission data of the random access channel whose phase has been changed by the phase change unit to the base station;
The phase of the comb-tooth spectrum of the transmission data of the random access channel transmitted to the base station using the random access channel is determined based on its own mobile station information, supplied to the phase changing unit, and the reception confirmation Based on the confirmation result from the unit, if the comb tooth spectrum to be transmitted is not received by the base station of the transmission destination, the phase is determined based on the mobile station information different from the current one, and the phase changing unit A transmitter comprising: a RACH phase determining unit for supplying and outputting.

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