JP2001251681A - Method and device for constituting channel in mobile communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a data communication system where a communication speed is asymmetric in outgoing and incoming directions as for a mobile communication system. SOLUTION: The channel constituting device of the mobile communication system is provided with each first channel 114a-114c for transmitting a signal in an outgoing direction from a base station 102 to a mobile station 104 and a plurality of second channels 116a-116c for transmitting an incoming direction signal from the mobile section 104 to the base station 102. In the device, the asymmetric data communication system with the different direction communication speed is constituted by arranging a storage means for storing assignment information of the second channels and an assigning means for assigning one of the second channels to the mobile station 104.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a channel configuration method and a channel configuration device in a mobile communication system. More specifically, between a base station and multiple mobile stations,
The present invention relates to a channel configuration method and a channel configuration device for performing data communication via a plurality of communication channels whose communication speed is asymmetric in the vertical direction.

[0002]

2. Description of the Related Art In recent years, communication systems in which the communication speed is asymmetric in the vertical direction have been spotlighted. This asymmetric communication system is expected to be compatible with information distribution type and PUSH type service applications. Such an application has a traffic characteristic of transmitting a large amount of data in one direction, such as downloading a file or accessing the web, and transmitting only a small amount of data corresponding to a delivery confirmation for the one direction.

[0003] Such an asymmetric communication system uses TCP.
There is a need for a channel configuration method that allows transmission of general-purpose protocols such as / IP and that operates up and down channels in a balanced manner.

A typical example of a wired communication system is as follows.
ADSL (Asymmetric Digital Su
bscriber Line). ADSL uses a high-frequency band that is not used for voice communication as a high-speed transmission line in a normal metallic subscriber line. Therefore,
Due to the band limitation of the metallic subscriber line, it is not possible to increase the capacity beyond a certain level.

As a typical example of a wireless communication system,
There is a satellite internet system. The satellite Internet uses a large-capacity satellite line from the network to the terminal, but uses a conventional metallic subscriber line in the direction from the terminal to the network. Therefore, the down link is limited by the capacity of the satellite link, and the terminal interface and contract are complicated.

On the other hand, as an asymmetric speed system composed of wireless channels in both directions, VSAT (Very
Although there is a data distribution service of the Small Aperture (Terminal) type, it is used as a fixed station and cannot be found in a mobile communication system.

Further, in a mobile data communication system,
RCR (Research & Development C
enter for Radio systems: The current Radio Industries and Business Association)
DC (Personal Digital Cellu)
lar) There is a packet system, but the channels in both directions have the same capacity.

[0008]

SUMMARY OF THE INVENTION In a mobile data communication system, in order to realize a communication system in which the communication speed is asymmetrical in the vertical direction, when a system in which channels are arranged one-to-one in the vertical direction is used, There were the following problems.

In the above-described example of the wireless communication system, the channel is a common access channel shared by a plurality of mobile stations, and is shared by both mobile stations. In this case, if calls having different data traffic characteristics simultaneously communicate, a delay in access control occurs due to random access or a delay in transmission / reception of data itself, resulting in a large fluctuation in delay amount. was there.

When a high load is applied in one direction, the opposite direction also corresponds to one-to-one. That is, when a high load is applied in the downlink direction, there is a problem that even if the usage rate of the channel in the uplink direction is low, the transmission confirmation is delayed, and the entire transmission and reception is delayed.

[0011] Further, it is desirable to suppress transmission power in a mobile station from the viewpoint of power consumption. When an uplink with the same capacity as a high-speed and large-capacity downlink is configured, the transmission power of the mobile station increases, and the configuration of the mobile station itself also increases.

The present invention has been made in view of such a problem, and an object of the present invention is to increase or decrease the communication speed by passing a plurality of communication channels between a base station and a plurality of mobile stations. An object of the present invention is to provide a channel configuration method and a channel configuration device for realizing a mobile data communication system that is asymmetric in a direction.

[0013]

In order to achieve the above object, the present invention is directed to a first channel for transmitting a signal in a downlink direction from a base station to a mobile station. And a plurality of second channels for transmitting an uplink signal from the mobile station to the base station, in a channel configuration method of a mobile communication system, wherein a storage step of storing the allocation information of the second channel; And allocating any one of the second channels to the mobile station.

According to this method, by individually allocating the channels in the uplink direction, the use of the channel is not limited to acknowledgment, but can be used for transmission of a general-purpose protocol such as TCP / IP. Also, during the allocation, the speed of the uplink channel is guaranteed, so that no delay fluctuation occurs, and it is possible to reduce the delay fluctuation of the entire communication including the delivery confirmation.

According to a second aspect of the present invention, there is provided the channel configuration method for a mobile communication system according to the first aspect, wherein the communication speed of the first channel is higher than the communication speed of the second channel. Features.

According to this method, the downlink is a high-speed and large-capacity common access channel, and the uplink is a low-speed and small-capacity communication channel of a plurality of individual allocation schemes. And an efficient channel configuration method for a data communication system can be provided.

According to a third aspect of the present invention, there is provided the channel configuration method for the mobile communication system according to the first aspect, wherein the mobile station shares one of the plurality of second channels. It is characterized by being used.

According to this method, specific control information and small-capacity data are transmitted by random access and distinguished from signals transmitted on individually allocated channels, so that efficient channel management allocation and data transmission can be achieved. It can be carried out.

[0019] According to a fourth aspect of the present invention, one first channel for transmitting a signal in a downlink direction from a base station to a mobile station;
In a channel configuration device of a mobile communication system including a plurality of second channels for transmitting an uplink signal from the mobile station to the base station, a storage unit configured to store allocation information of the second channel; Allocating means for allocating any one of the second channels to the mobile station.

According to this configuration, by individually allocating uplink channels, it is possible to use the channels not only for acknowledgment but also for transmission of general-purpose protocols such as TCP / IP. Also, during the allocation, the speed of the uplink channel is guaranteed, so that no delay fluctuation occurs, and it is possible to reduce the delay fluctuation of the entire communication including the delivery confirmation.

According to a fifth aspect of the present invention, there is provided the channel configuration device of the mobile communication system according to the fourth aspect, wherein the communication speed of the first channel is higher than the communication speed of the second channel. Features.

According to this configuration, the downlink is a high-speed and large-capacity common access channel, and the uplink is a low-speed and small-capacity communication channel of a plurality of individual allocation schemes. Thus, an efficient data communication system can be configured.

According to a sixth aspect of the present invention, there is provided the channel configuration device of the mobile communication system according to the fourth aspect, wherein one of the plurality of second channels is shared by the mobile station. It is characterized by being used.

According to this configuration, specific control information and small-capacity data are transmitted by random access and distinguished from signals transmitted on individually allocated channels, thereby achieving efficient channel management allocation and data transmission. It can be carried out.

[0025]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows an embodiment of a mobile data communication system according to the present invention. The system includes a control station 100, a base station 102, and a mobile station 104. The base station 102 corresponds to each of the areas 106a to 106c in the service providing area, and corresponds to each area base station transmitter 108a to 108c, each area base station receiver 110a to 110c, and each area base station transmission / reception control unit. 112a to 112c are provided. Downlink common access channels 114a to 114c are used from the base station 102 to the mobile station 104, and uplink communication channel groups 116a to 116 are used from the mobile station 104 to the base station 102.
Use c. The control station 100 controls the base station 102
The allocation management of the uplink communication channel groups (116a to 116c) is performed.

FIG. 2 shows an example of the configuration of a communication channel in an embodiment of the present invention. CH1 is a configuration of the downlink common access channels 114a to 114c in FIG. Since a plurality of mobile stations are shared, a high-speed and large-capacity channel is conceivable. CH2 is a configuration of a dedicated channel for performing random access among the uplink communication channel groups 116a to 116c in FIG. CH3 is
FIG. 1 shows the configuration of uplink communication channel groups 116a to 116c that are allocated and managed by the control station 100. Since the uplink communication channel 116 is individually allocated to the mobile station, the uplink communication channel 116 can be configured with a line having a lower speed and a smaller capacity than the downlink common access channel 114.

Each channel includes a flag pattern 200. CH1 includes downlink control information 202 and downlink user data 204. Further, CH2 includes uplink control information 206a and guard time 208, and CH3 includes uplink control information 206b and uplink user data 210.

FIG. 3 shows an example of a communication sequence in the embodiment of the present invention. The mobile station 104 located in the area 106a receives the downlink common access channel 114a from the base station 102, and acquires the configuration information 301 via the downlink control information 202 broadcast on CH1. Mobile station 10
4 determines a frequency to be used and the like based on the configuration information 301. Next, the mobile station 104 performs an allocation request 3 as uplink control information 206a by random access on CH2.
02 is transmitted. The base station 102 transfers the allocation request 302 to the control station 100 as an allocation request 303. The control station 100 stores the allocation information of the uplink communication channel group 116a, and assigns the unallocated uplink communication channel CH3 to the mobile station 104 from the uplink communication channel group 116a.
Assign to The control station 100 transmits an allocation instruction 304, and the base station 102 transmits the allocation instruction 304 from the control station 100 via the downlink control information 202 of CH1 to the mobile station 10
4 as an assignment instruction 305.

When communication is started, for example, an incoming call to the mobile station 104 is made via the downlink control information 202 broadcast on CH1, and a call from the mobile station 104 is made on CH3. This is performed via the uplink control information 206b. The mobile station 104, on the assigned CH3,
The uplink user data 306 (same as the uplink user data 210 in FIG. 2) is transmitted, and the downlink user data 307 (the downlink user data 204 in FIG.
Same as ) To transmit and receive data. At this time, the uplink communication channel CH3 is set to the mobile station 104.
Is occupied and used by the downlink common access channel 114a.
Are transmitted to the mobile station 104 according to the data arrival order.

It should be noted that at least one of the functions of the control station 100 can be realized by another device of the mobile data communication system including the base station 102.

[0032]

As described above in detail, according to the present invention, the storing step of storing the allocation information of the second channel, and allocating any one of the plurality of second channels to the mobile station. Since the method includes the assignment step, the second channel in the uplink direction can be individually assigned, and the use of the channel is not limited to acknowledgment, but can be used for transmission of a general-purpose protocol such as TCP / IP. Also, during the assignment, the speed of the uplink channel is guaranteed,
No delay fluctuation occurs, and it is possible to reduce the delay fluctuation of the entire communication including the delivery confirmation.

Further, according to the present invention, since the communication speed of the first channel is higher than the communication speed of the second channel, the downlink is a high-speed and large-capacity common access channel, and the uplink is a low-speed and small-capacity. And a communication channel of a data communication system that is efficient in terms of power consumption and frequency of the mobile station.

Further, according to the present invention, any one of the plurality of second channels is shared and used by the mobile station, so that specific control information and small-capacity data can be obtained by random access. Signals that are transmitted and transmitted on individually allocated channels can be distinguished, allowing for efficient channel management allocation and data transmission.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a mobile data communication system according to the present invention.

FIG. 2 shows an example of a configuration of a communication channel in an embodiment of the present invention.

FIG. 3 shows an example of a communication sequence in the embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 control station 102 base station 104 mobile station 106 area 108 base station transmitter for each area 110 base station receiver for each area 112 base station transmission / reception control unit 114 downlink common access channel 116 uplink communication channel group 200 flag pattern 202 Downlink control information 204, 307 Downlink user data 206 Uplink control information 208 Guard time 210, 306 Uplink user data 301 Configuration information 302, 303 Assignment request 304, 305 Assignment instruction

Continued on the front page F term (reference) 5K030 GA02 GA08 GA19 HC01 HC09 JA07 JT09 LB14 LC09 5K033 AA01 AA04 CB01 CB14 DA19 5K034 AA03 AA04 AA15 DD01 DD06 EE06 EE07 HH17 HH26 JJ11 MM08 5K012 AJ13 EB21 EJ21 BB21 KK56

Claims (6)

[Claims] 1. A mobile unit comprising: one first channel for transmitting a signal in a downlink direction from a base station to a mobile station; and a plurality of second channels for transmitting an uplink signal from the mobile station to the base station. A channel configuration method for a communication system, comprising: a storage step of storing allocation information of the second channel; and an allocation step of allocating any one of the plurality of second channels to the mobile station. And a channel configuration method for a mobile communication system. 2. The mobile communication system according to claim 1, wherein the communication speed of the first channel is higher than the communication speed of the second channel. Channel configuration method. 3. The channel configuration method for a mobile communication system according to claim 1, wherein one of the plurality of second channels is shared by the mobile station. A channel configuration method for a mobile communication system. 4. A mobile unit comprising one first channel for transmitting a signal in a downlink direction from a base station to a mobile station, and a plurality of second channels for transmitting an uplink signal from the mobile station to the base station. A channel configuration device for a communication system, comprising: storage means for storing allocation information of the second channel; and allocation means for allocating any one of the plurality of second channels to the mobile station. A channel configuration device of a mobile communication system. 5. The mobile communication system according to claim 4, wherein the communication speed of the first channel is higher than the communication speed of the second channel. Channel configuration device. 6. The channel configuration device for a mobile communication system according to claim 4, wherein one of the plurality of second channels is shared by the mobile station. A channel configuration device of a mobile communication system.