JP2010220262A - Control method and mobile communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform efficient wireless communication by making the coverage of a wireless base station widened. <P>SOLUTION: Within a frame wherein at least part of guard bits in a first slot are present in a second slot following the first slot, data to be used for adjusting transmission timing of a mobile station are transmitted, and these data are used to control the transmission timing of a signal requesting channel allocation so that the mobile station transmits the signal-requesting channel allocation to a wireless base station 100. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a control method and a mobile communication system.

  In wireless communication, a large number of users share the same frequency band and communicate with the other party. Therefore, the TDMA (Time Division) shares the same frequency by dividing the time for each user so that each set of communication does not interfere with each other. Multiple Access (time division multiplexing) is widely used.

  In addition, a subscriber unit (SU), which is a subscriber terminal device that is fixedly placed in a PHS (Personal Handyphone System) or home and performs communication, performs transmission and reception alternately on the same carrier wave in time. Division Duplexing: Time-division bi-directional transmission. With such a TDMA-TDD system, a given frequency band is efficiently used.

  FIG. 15 is a diagram showing a slot arrangement of a TDMA-TDD frame. A transmission slot and a reception slot are multiplexed with 4 channels of TX1 to TX4 and RX1 to RX4, respectively, in one frame (384 Kbps) of 5 ms with respect to the frequency from one radio base station.

  A 16-bit guard bit g is provided in the frame in order to prevent a radio signal collision caused by a radio wave delay difference, clock jitter, or the like. The bit configuration of TX and RX is 240 bits including the guard bit g.

  SU1 located at a short distance from the radio base station receives downlink data from the radio base station in the slot time of the transmission slot TX1. Then, after the reception, the uplink data is output after a predetermined time (2.5 msec) has elapsed. The radio base station can receive uplink data from SU1 located at a short distance in the reception slot RX1.

On the other hand, SU2 located at a certain distance from the radio base station receives downlink data from the radio base station in the slot time of transmission slot TX2 with a delay of propagation delay time td0.
Therefore, when SU2 outputs uplink data, it is output with a delay of (2.5 msec + td0) as viewed from the radio base station side, but within the guard bit g protection range as shown in the figure. Therefore, the radio base station can receive the uplink data from SU2 in the reception slot RX2.

  However, the conventional TDMA-TDD technique as described above has a problem that the coverage (service area) cannot be expanded widely even if the output power of the radio base station or SU is increased.

  FIG. 16 is a diagram for explaining the problems of the conventional TDMA-TDD. The SU 3 located at a long distance from the radio base station receives the downlink data from the radio base station in the slot time of the transmission slot TX3 with a delay of the propagation delay time td1.

  Therefore, when SU3 outputs uplink data, it is output with a delay of (2.5 msec + td1) when viewed from the radio base station side. In this case, as shown in the figure, the guard bit g It falls out of the protection range and spans the reception slots RX3 and RX4. For this reason, in the radio base station, reception is impossible in the reception slots RX3 and RX4, and the number of usable time slots eventually decreases.

As described above, the SU 3 located at a long distance from the radio base station cannot communicate with the radio base station, and performs transmission / reception with another radio base station located at a closer distance.
Accordingly, when a plurality of SUs are installed, radio base stations that can cover the SUs are also installed. However, it is more economical to cover the SUs widely with as few radio base stations as possible.

  The present invention has been made in view of these points, and an object of the present invention is to provide a control method and a mobile communication system for expanding the coverage of a radio base station and performing efficient radio communication.

  In order to solve the above problem, a channel assignment signal is transmitted from a mobile station to a radio base station, and a channel assignment signal is transmitted from the radio base station in response to the signal requesting the channel assignment. Communication system in which the mobile station receives the signal and transmits a signal for setting a call from the mobile station to the radio base station using the channel assigned by the channel assignment signal. A control method is provided. In this control method, transmission of data used for adjusting the transmission timing of the mobile station is performed in a frame in which at least a part of the guard bits in the first slot exists in the second slot that is continuous with the first slot. The transmission timing of the signal requesting the channel assignment is controlled using the data, and the mobile station transmits the signal requesting the channel assignment to the radio base station.

  It is possible to expand the coverage of the wireless base station and perform efficient wireless communication.

1 is a principle diagram of a wireless communication system. It is a figure for demonstrating a continuous time slot and transmission timing. It is a block diagram which shows the outline | summary of WLL. It is a figure which shows allocation of a continuous time slot. It is a figure which shows a super frame when assigning the continuous time slot of two radio base stations to one flame | frame. It is a figure which shows the sequence which calculates transmission timing. It is a flowchart which shows the process sequence of a radio | wireless communication method. It is a principle figure which shows the modification of a radio | wireless communications system. It is a figure which shows the sequence which calculates transmission timing. It is a figure which shows the format structure of BCCH. It is a flowchart which shows the process sequence of a radio | wireless communication method. It is a figure which shows a position registration sequence. It is a figure which shows a transmission sequence. It is a figure which shows an incoming call sequence. It is a figure which shows slot arrangement | positioning of a TDMA-TDD frame. It is a figure for demonstrating the problem of the conventional TDMA-TDD.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a principle diagram of a wireless communication system. The wireless communication system 1 includes a propagation information calculation device 10 and a transmission timing calculation device 20.

  The propagation information calculation device 10 is arranged in the radio base station 100, and the transmission timing calculation device 20 is arranged in a terminal device 200 connected to a telephone or the like. The terminal device 200 and the radio base station 100 perform radio communication via respective antennas.

The terminal device 200 will be described below assuming that it is a subscriber terminal device that performs communication at a fixed position.
The continuous time slot assigning means 11 continuously assigns time slots in the TDMA-TDD frame to the propagation information calculating apparatus 10 to generate continuous time slots.

Specifically, two time slots including one control time slot and the expanded guard bit are set as continuous time slots. This will be described later with reference to FIG.
The propagation information calculation means 12 communicates with the terminal device 200 during the continuous time slot period, and calculates the propagation information of the radio wave between the radio base station 100 and the terminal device 200.

  Specifically, first, test data is transmitted to the terminal device 200. Then, by measuring the time taken to receive the test data returned from the terminal device 200, the propagation time or distance of radio waves between the radio base station 100 and the terminal device 200 (= radio wave propagation time * speed of light). ) As propagation information.

  For the terminal device 200, the transmission timing calculation means 21 calculates the transmission timing of a signal to be transmitted from the terminal device 200 to the radio base station 100 based on the propagation information in a continuous time slot period.

  That is, the “early start” timing is calculated in time for the timing of the corresponding reception slot in the radio base station 100. The signal transmission unit 22 transmits a signal to the radio base station 100 based on the calculated transmission timing.

  Also, the transmission timing calculation device 20 stores the calculated transmission timing information in a non-volatile memory (not shown) such as a flash memory. Thus, when communication with the radio base station 100 is started, it is not necessary to perform transmission timing calculation processing again.

  Next, continuous time slots and transmission timing will be described. FIG. 2 is a diagram for explaining continuous time slots and transmission timing. Normal frames are multiplexed as 4 slots each as transmission slots TX1 to TX4 and reception slots RX1 to RX4 to form one frame.

First, when the terminal device 200 transmits a time notification request to be described later to the radio base station 100, the continuous time slot assigning means 11 assigns continuous time slots as shown in the figure.
In other words, it consists of a transmission slot TX1 and a time slot with guard bits up to the transmission slot TX2, and an upstream continuous time slot Ta, a reception slot RX1, and a time slot with guard bits up to the reception slot RX2. A downstream continuous time slot Ra is generated.

The terminal device 200 located at a long distance from the radio base station 100 receives the downlink data from the radio base station 100 at the position shown in the figure with a delay of the propagation delay time td2.
Therefore, when the terminal device 200 outputs the uplink data, it is output with a delay of (2.5 msec + td2) as viewed from the radio base station 100 side (the time of 2.5 msec is the downlink data). Radio base station 100, since the protection range of guard bits is expanded by continuous time slots Ra as shown in the figure. Uplink data from the terminal device 200 can be received in the continuous time slot Ra (after all, it is received in RX1 with an expanded guard bit).

  Therefore, the propagation information calculation means 12 includes the radio base station 100 and the terminal device 200 within the period in which such continuous time slots are allocated (if this period of time is allocated, other time slots are assigned. Without going over, communication of downlink data and uplink data is performed between the radio base station 100 and the terminal device 200) at a distance where normal communication can be performed, and propagation information is generated.

  Then, the transmission timing calculation means 21 transmits, based on the calculated propagation information, a transmission timing (early timing) t in which uplink data is in time for the reception slot RX1 within a period in which such continuous time slots are allocated. Is calculated.

  After the transmission timing t is determined, the allocation of continuous time slots is canceled. Thereafter, even if the terminal device 200 receives the downlink data in the transmission slot TX1 delayed by the propagation delay time td2, the uplink data can be transmitted early at the transmission timing t, which is the early timing, so that it is in time for the reception slot RX1.

  As described above, the radio communication system 1 is configured to generate continuous time slots, calculate propagation information in the continuous time slot period, calculate transmission timing t based on the propagation information, and transmit a signal.

  Thereby, since the coverage range is expanded even for the terminal device 200 that is located at a long distance from the radio base station 100 and is outside the coverage range of the radio base station 100, the radio base station 100 is transferred to the terminal device 200. It becomes possible to provide services.

  In addition, since the coverage is expanded, the number of radio base stations is reduced as a whole, and the time slot is effectively used. Therefore, it is possible to perform economical and efficient radio communication.

  Next, WLL (Wireless Local Loop) to which the wireless communication system 1 is applied will be described. FIG. 3 is a block diagram showing an outline of WLL. The WLL is a system that wirelessly realizes between a subscriber-side exchange and a subscriber's house that have been conventionally provided by wired facilities.

The WLL system includes a public network 60 including an exchange 61, a base station controller 50, and a plurality of coverages C1 and C2.
The coverage C1 includes the radio base station 101 and subscriber terminal apparatuses 201 and 202. The coverage C <b> 2 includes the radio base station 102 and the subscriber terminal device 203. In addition, telephone terminals are connected to the subscriber terminals 201 to 203.

  The base station control device 50 is connected to the exchange 61 and the radio base stations 101 and 102 via a wired line, and controls the radio base stations 101 and 102. The subscriber terminal devices 201 and 202 are connected to the radio base station 101 via radio lines, respectively, and perform subscriber radio control for connecting the telephone to the radio base station 101 by radio.

Similarly, the subscriber terminal device 203 is connected to the radio base station 102 via a radio line, and performs subscriber radio control for wirelessly connecting the telephone to the radio base station 102.
For such a WLL system, if the wireless base station 101 can include not only the subscriber terminal devices 201 and 202 but also the subscriber terminal device 203 at a long distance in the coverage C1, the number of wireless base stations is reduced. Is economical. In the present invention, the coverage of such a wireless base station is expanded, and efficient wireless communication can be realized.

  In the WLL system, in particular, a PHS-WLL system using a PHS data transmission method has been developed recently, and the subscriber terminal device has a network-driven configuration similar to that of the PHS. It is common.

Next, the continuous time slot assigning means 11 will be described. FIG. 4 is a diagram showing allocation of continuous time slots.
In TDMA-TDD, a 625 μs time slot is multiplexed as 4 slots for transmission slots TX1 to TX4 and reception slots RX1 to RX4 to form one frame of 5 ms. This frame is composed of 20 frames, and a super frame SF (100 ms) is generated.

  Here, downlink time slots TX1 and TX2 and uplink time slots RX1 and RX2 are assigned to the first frame of the superframe SF as continuous time slots of BTE (Base Transceiver Equipment: radio base station) 1.

For BTE2, downlink time slots TX2 and TX3 and uplink time slots RX2 and RX3 of the second frame are assigned as continuous time slots.
By assigning continuous time slots in this way, it is possible to finally assign continuous time slots to the BTE 20 in the superframe SF.

That is, the BTE 20 is assigned with the downlink time slots TX2 and TX3 and the uplink time slots RX2 and RX3 of the 20th frame as continuous time slots.
It is also possible to assign two radio base station continuous time slots to one frame. FIG. 5 is a diagram showing a super frame SF when two time slots of two radio base stations are assigned to one frame.

  BTE1 assigns continuous time slots to downlink time slots TX1 and TX2 and uplink time slots RX1 and RX2 of the first frame. BTE2 assigns continuous time slots to downlink time slots TX3 and TX4 and uplink time slots RX3 and RX4 of the first frame.

By assigning continuous time slots in this way, it is possible to finally assign continuous time slots to the BTE 40 in the superframe SF.
That is, consecutive time slots of BTE39 are allocated to the downlink time slots TX1 and TX2 of the 20th frame, the uplink time slots RX1 and RX2, the BTE40 of the downlink time slots TX3 and TX4 of the 20th frame, and the BTE40 of the uplink time slots RX3 and RX4. Consecutive time slots are allocated.

In this way, if all time slots of one superframe SF are assigned as continuous time slots, it is possible to assign to a maximum of 40 radio base stations.
However, in any case of FIG. 4 and FIG. 5, continuous time slot allocation across the boundary between the transmission slot TX and the reception slot RX is not performed.

  Further, after the continuous time slots are allocated and the transmission timing t is calculated, the allocation of the continuous time slots is cancelled. After that, one slot each of the transmission slot TX and the reception slot RX is set as a control time slot, and the remaining time slot is set as a bearer time slot, and communication is returned to normal TDMA-TDD.

Next, a sequence for calculating the transmission timing t by performing communication between the radio base station 100 and the terminal device 200 will be described. FIG. 6 is a diagram showing a sequence for calculating the transmission timing t.
[S1] The terminal device 200 transmits a time notification request to the radio base station 100 using a control channel SCCH (Signaling Control Channel). Here, SCCH is a control channel used when information necessary for call connection is transferred between the radio base station 100 and the terminal device 200.
[S2] The continuous time slot assigning means 11 of the radio base station 100 assigns continuous time slots to the uplink time slot and the downlink time slot, respectively.
[S3] The continuous time slot allocation means 11 transmits test data to the terminal device 200. Then, an internal timer is started to store the time when the test data is transmitted.
[S4] The terminal device 200 receives the test data and transmits it back to the radio base station 100.

If the test data is not sent back from the terminal device 200 and the timer in the continuous time slot assigning means 11 times out, the operations in steps S3 and S4 are repeated.
[S5] The propagation information calculation means 12 of the radio base station 100 receives the test data sent back from the terminal device 200, and measures the time of reception. Then, the propagation time or distance of radio waves between the radio base station 100 and the terminal device 200 is calculated from the time stored in step S3 and the time of reception. Here, it is assumed that the propagation time is calculated.
[S6] The propagation time is transmitted to the terminal device 200 as propagation information.
[S7] The transmission timing calculation means 21 calculates a transmission timing t of a signal to be transmitted from the terminal device 200 to the radio base station 100 based on the propagation time.

In other words, the timing of quick start is calculated in time for the timing of the corresponding reception slot in the radio base station 100.
[S8] The terminal device 200 transmits a link channel establishment request to the radio base station 100 using the SCCH according to the determined transmission timing t.
[S9] When the radio base station 100 normally receives the link channel establishment request, the radio base station 100 returns the link channel assignment by SCCH to the terminal device 200.
[S10] Thereafter, location registration, transmission, and reception are performed between the radio base station 100 and the terminal device 200. However, when uplink data is transmitted from the terminal device 200 to the radio base station 100, all are transmitted by the signal transmission means 22 in accordance with the transmission timing t calculated in step S7.

Next, a wireless communication method will be described. FIG. 7 is a flowchart showing a processing procedure of the wireless communication method.
[S20] Continuous time slots are generated by continuously assigning time slots in a frame.
[S21] Communication with the terminal device is performed in a continuous time slot period to calculate propagation information of radio waves between the radio base station and the terminal device.

As calculation of propagation information, the time from transmitting test data to the terminal device until receiving the test data returned from the terminal device is measured, and the propagation time or distance of the radio wave between the radio base station and the terminal device is calculated. .
[S22] In a continuous time slot period, the transmission timing of a signal to be transmitted from the terminal device to the radio base station is calculated based on the propagation information.
[S23] A signal is transmitted based on the transmission timing.

  As described above, the radio communication system 1 and the radio communication method generate continuous time slots, communicate with the terminal device 200 during the continuous time slot period, and transmit radio waves between the radio base station 100 and the terminal device 200. The transmission timing t is calculated based on the propagation information and the signal is transmitted.

Thereby, the coverage of the radio base station 100 can be expanded, and efficient radio communication can be performed.
In addition, since the radio base station 100 and the terminal device 200 communicate with each other to automatically determine the transmission timing t, it is not necessary to perform any special work on the radio base station 100 or the terminal device 200. It becomes possible to improve work efficiency and maintenance management.

Next, a modified example of the wireless communication system 1 will be described. FIG. 8 is a principle diagram showing a modification of the wireless communication system 1.
A radio communication system 2 that is a modification includes a base station position information acquisition device 30 and a transmission timing calculation device 40.

  The base station position information acquisition device 30 is arranged in the radio base station 100, and the transmission timing calculation device 40 is arranged in a terminal device 200 connected to a telephone or the like. The terminal device 200 and the radio base station 100 perform radio communication via respective antennas. The terminal device 200 corresponds to a subscriber terminal device.

For the base station position information acquisition device 30, the base station position information acquisition unit 31 acquires base station position information that is position information of the radio base station 100.
For example, base station position information is acquired using a GPS (Global Positioning System) that is a positioning system using satellites. The base station position information notifying means 32 notifies the terminal device 200 of base station position information.

For the transmission timing calculation device 40, the terminal location information acquisition unit 41 acquires terminal location information that is location information of the terminal device 200.
For example, the terminal position information is acquired using GPS or the like, which is a position positioning system using a satellite.

  The propagation information calculation means 42 calculates radio wave propagation information between the radio base station 100 and the terminal device 200 from the base station position information and the terminal position information. That is, the propagation time or distance of radio waves between radio base station 100 and terminal device 200 (= propagation time of radio waves * speed of light) is calculated as propagation information.

  The transmission timing calculation unit 43 calculates the transmission timing of a signal to be transmitted from the terminal device 200 to the radio base station 100 based on the propagation information. This transmission timing is the same as the above-mentioned quick start timing. The signal transmission unit 44 transmits a signal to the radio base station 100 based on this transmission timing.

Further, the transmission timing calculation device 40 stores the calculated transmission timing information in a non-volatile memory (not shown) such as a flash memory.
Next, a sequence for calculating the transmission timing by performing communication between the radio base station 100 and the terminal device 200 will be described. FIG. 9 is a diagram showing a sequence for calculating the transmission timing.
[S30] The base station position information acquisition means 31 of the radio base station 100 acquires base station position information, which is its own position information, from the GPS.
[S31] The terminal location information acquisition means 41 of the terminal device 200 acquires terminal location information that is its own location information from the GPS.
[S32] The base station location information notifying means 32 of the radio base station 100 transmits base station location information to the terminal device 200 using a control channel BCCH (Broadcast Control Channel) (actually, a plurality of base station location information notification means 32). Notification to the terminal device).

Here, BCCH is a control channel for reporting a control signal from the radio base station 100 to the terminal device 200.
[S33] The propagation information calculation means 42 of the terminal device 200 calculates propagation information from the base station position information and the terminal position information.
[S34] The transmission timing calculation means 43 calculates the transmission timing of a signal to be transmitted from the terminal device 200 to the radio base station 100 based on the propagation information.

In other words, the timing of quick start is calculated in time for the timing of the corresponding reception slot in the radio base station 100.
[S35] The terminal device 200 transmits a link channel establishment request to the radio base station 100 using the SCCH according to the determined transmission timing.
[S36] When the radio base station 100 normally receives the link channel establishment request, the radio base station 100 returns the link channel assignment by SCCH to the terminal device 200.
[S37] Thereafter, location registration, transmission, and reception are performed between the radio base station 100 and the terminal device 200. However, when uplink data is transmitted from the terminal device 200 to the radio base station 100, all are transmitted by the signal transmission unit 44 according to the transmission timing calculated in step S34.

  Next, the format configuration of BCCH, which is a control channel used when base station location information notifying means 32 notifies base station location information, will be described. FIG. 10 is a diagram showing a format structure of BCCH.

  BCCH has a bit configuration of 124 bits. The channel type CI is 4 bits, the originating identification code which is the calling code of the own station is 42 bits, I which is the information part is 62 bits, and the CRC is 16 bits.

  The information part I is composed of 8-bit octets 1 to 7 and 6-bit octets 8. The “reservation” in octet 1 is a bit indicating either private use or public use. “Message type” indicates that it is a BCCH message when it starts from the seventh bit (0 0 0 1 0 0 1).

  The “LCCH interval value” of octet 2 indicates the intermittent period of the downlink LCCH (logical control channel) slot. LCCH is a general term for functional channels including BCCH, PCH, SCCH, and USCCH, which are used in the link channel establishment phase.

  The “incoming call grouping factor” of octet 3 indicates a value corresponding to the grouping number of PCH (Batch Call Channel) information. The “general call area number” of octet 3 indicates the bit length of the general call area number of CS-ID (radio base station ID) for public use.

Then, base station position information is written in octets 4 to 7. In the figure, an area of 4 octets is secured as a description area for base station position information.
Next, a wireless communication method will be described. FIG. 11 is a flowchart showing the processing procedure of the wireless communication method.
[S40] The base station position information which is the position information of the radio base station is acquired.
[S41] Notify the base station position information.
[S42] Obtain terminal location information, which is location information of the terminal device.
[S43] Radio wave propagation information between the radio base station and the terminal device is calculated from the base station location information and the terminal location information.
[S44] Based on the propagation information, the transmission timing of the signal to be transmitted from the terminal device to the radio base station is calculated.
[S45] A signal is transmitted based on the transmission timing.

  As described above, the radio communication system 2 and the radio communication method calculate propagation information of radio waves between the radio base station 100 and the terminal device 200 from the respective position information of the radio base station 100 and the terminal device 200, and propagate. Based on the information, the transmission timing t is calculated and the signal is transmitted.

Thereby, the coverage of the radio base station 100 can be expanded, and efficient radio communication can be performed.
Next, a sequence of location registration, transmission and reception performed after determination of the transmission timing obtained by the wireless communication systems 1 and 2 or the wireless communication method described above will be described. FIG. 12 shows a location registration sequence.

When an incoming connection is made from a radio base station to a terminal device, the terminal device performs location registration for registering the location where the terminal device is located in the radio base station in advance.
[S50] A link channel establishment request and link channel allocation are performed by SCCH using a control time slot.
[S51] The radio base station and the terminal device establish synchronization using a synchronization burst signal.
[S52] The terminal device makes a location registration request to the radio base station.
[S53] The radio base station returns location registration acceptance to the terminal device.
[S54] The radio base station instructs the terminal device to disconnect the radio channel.
[S55] The terminal device notifies the completion of disconnection of the wireless channel.

  A bearer time slot is used from step S51. Further, all transmissions (dotted line arrows) from the terminal device to the radio base station are performed based on the transmission timing which is the early timing.

FIG. 13 is a diagram showing a transmission sequence. The transmission is a call connection phase for establishing a service channel (SCH) used for transmitting voice, data, and the like according to a request from the terminal device.
[S60] A link channel establishment request and link channel allocation are performed by SCCH using a control time slot.
[S61] The radio base station and the terminal apparatus establish synchronization using a synchronization burst signal.
[S62] The terminal device sets up a call to the radio base station.
[S63] The radio base station returns a call setup acceptance to the terminal device.
[S64] The radio base station calls the terminal device.
[S65] The radio base station transmits an RBT (ring back tone) to the terminal device.
[S66] The radio base station responds to the terminal device.
[S67] The terminal device makes a call via the radio base station.

  A bearer time slot is used from step S61 onward. Further, all transmissions (dotted line arrows) from the terminal device to the radio base station are performed based on the transmission timing which is the early timing.

FIG. 14 shows an incoming call sequence. An incoming call is a call connection phase for establishing an SCH to be used for transmission of voice, data, or the like in response to a request from the network side.
[S70a] The radio base station transmits an incoming call message (PCH) to the terminal device to indicate an incoming call.
[S70] A link channel establishment request and link channel allocation are performed by SCCH using a control time slot.
[S71] The radio base station and the terminal apparatus establish synchronization using a synchronization burst signal.
[S72] The terminal device makes an incoming call response to the radio base station.
[S73] The radio base station sets up a call to the terminal device.
[S74] The terminal device returns a call setup acceptance to the radio base station.
[S75] The terminal device calls the radio base station.
[S76] The terminal device responds to the radio base station.
[S77] The radio base station returns a response confirmation to the terminal device.
[S78] The terminal device performs a call through the radio base station.

  A bearer time slot is used from step S71. Further, all transmissions (dotted line arrows) from the terminal device to the radio base station are performed based on the transmission timing which is the early timing.

DESCRIPTION OF SYMBOLS 1 Radio | wireless communications system 10 Propagation information calculation apparatus 11 Continuous time slot allocation means 12 Propagation information calculation means 20 Transmission timing calculation apparatus 21 Transmission timing calculation means 22 Signal transmission means 100 Radio base station 200 Terminal apparatus

Claims (2)

A signal requesting channel assignment is transmitted from the mobile station to the radio base station, and the mobile station receives a channel assignment signal transmitted from the radio base station in response to the signal requesting channel assignment; In a control method in a mobile communication system that performs transmission by transmitting a signal for setting a call using the channel allocated by the channel allocation signal from the mobile station to the radio base station,
In a frame in which at least part of the guard bits in the first slot is present in a second slot that is continuous with the first slot, data used for adjusting the transmission timing of the mobile station is transmitted, and the data is A control method comprising: controlling a transmission timing of a signal requesting channel assignment using the mobile station and transmitting the signal requesting channel assignment to the radio base station. A signal requesting channel assignment is transmitted from the mobile station to the radio base station, and the mobile station receives a channel assignment signal transmitted from the radio base station in response to the signal requesting channel assignment; In a mobile communication system that performs transmission by transmitting a signal for setting a call using the channel allocated by the channel allocation signal from the mobile station to the radio base station,
At a stage before the mobile station transmits a signal requesting channel assignment to the radio base station, at least a part of the guard bits in the first slot exists in a second slot that is continuous with the first slot. Means for transmitting data used for adjusting the transmission timing of the mobile station in a frame, and means for controlling the transmission timing of a signal requesting allocation of the channel using the data; A mobile communication system.

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