JP3189204B2 - Channel configuration method of inter-station transmission line in mobile communication system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a line configuration method of an inter-station transmission line in a mobile communication system.

[0002] More specifically, the present invention relates to a mobile communication system for communicating between a radio base station and a control station, or between a radio base station as a master station and a small radio base station as a slave station. The present invention relates to a method for configuring a line of a transmission path to be connected.

[0003]

2. Description of the Related Art FIG. 1 shows a configuration of a transmission path between a radio base station and a control station in a conventional mobile communication system.

In FIG. 1, a 2 Mbps or 1.5 Mbps transmission line is generally used between the radio base station 3 and the control station 1. Transmission line 2 has a plurality of 64 kbps
The time slot 4 includes a control signal slot, a voice signal slot, a non-telephone signal slot, and the like.

A 64 kbps time slot for a voice signal in the transmission line 2 is allocated corresponding to a radio channel, and the number of 64 kbps time slots increases as the number of radio channels increases.

Here, if the number of possible multiplexes of the voice signal and the non-telephone signal in the transmission line is equal, the multiplexing is performed without considering whether the signal is a voice signal or a non-telephone signal. The voice signal and the non-telephone signal are transmitted using a common time slot.

On the other hand, when the number of possible multiplexes of the voice signal and the non-telephone signal in the transmission line is different, a non-telephone signal slot is provided on the transmission line in addition to the voice signal slot. Thus, the use efficiency of the transmission path is increased by adopting a configuration that can be accessed in common from the Internet.

That is, since the voice information in the radio section includes information for error correction code, the error correction code is decoded by the radio base station to determine the number of multiplexed voice signals in the transmission path by the non-telephone. Since the number of multiplexed signals can be higher than the number of multiplexed signals, the slots are separately set in consideration of the efficiency of use of the transmission path and the efficiency of use of the radio frequency.

[0009] As a general mode of general use, the utilization rate for non-telephone communication for voice communication is at most ten and several percent.
As such, the number of non-telephone signal slots may be smaller than the number of voice signal slots.

Further, since the control channel is a common access channel, the number of control channels may be extremely small as compared with the number of carriers. Therefore, the control signal of the transmission path between the base station and the control station can handle traffic of more than ten carriers in one slot.

[0011]

As described above, since the control channel is a common access channel, the number of carriers is extremely small compared to the number of carriers. However, on the transmission line, the control signal is transmitted to one dedicated time slot. Has been assigned to. Therefore, in the case of a base station having a small number of carriers, there is a problem that the efficiency of using the time slot for the control channel in the transmission path is reduced.

[0012] When the number of multiplexed voice signals and non-telephone signals that can be multiplexed in the transmission path is different, a dedicated slot for non-telephone signals is provided separately. One slot is allocated as a telephone slot.

As described above, even in a base station having a small capacity, a non-telephone signal, a voice signal and a control signal must be provided as separate time slots, and a station having a smaller number of carriers has a higher transmission path cost. Problem.

Accordingly, an object of the present invention is to provide
The transmission path connecting between the control station and the radio base station or between the base station serving as the master station and the small base station can be efficiently used, and the transmission path running cost can be reduced. Another object of the present invention is to provide a line configuration method of an inter-station transmission path in a mobile communication system.

[0015]

In order to achieve the above-mentioned object, a method for configuring a line of an inter-station transmission line in a mobile communication system according to the present invention comprises the steps of allowing a plurality of wireless mobile stations to communicate with a wireless base station. The radio base station is connected to a control station that performs voice processing and the like via a time-division multiplexed transmission path, and the radio base station further has a subordinate radio base station via the transmission path under its control. In the communication system, when the dependent radio base station having one carrier is connected to the control base station or the radio base station serving as a master station by a transmission path corresponding to one 64 kbps time slot, A voice signal, a non-telephone signal and a control signal are multiplexed and transmitted in the slot.

According to another aspect of the present invention, a plurality of wireless mobile stations communicate with a wireless base station, and the wireless base station is connected to a control station for performing voice processing or the like via a time-division multiplexed transmission path, Further, in the mobile communication system having a new subordinate radio base station via a transmission path under the control of the radio base station, the subordinate radio base station having three carriers accommodates the radio base station serving as a control station or a master station. Base station and 64 kbp
When connected by a transmission line for two s time slots, three carrier voice signals, non-telephone signals, and control signals are multiplexed and transmitted to the two time slots.

[0017]

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a circuit configuration method to which the present invention is applied, a plurality of radio mobile stations communicate with a radio base station, and the radio base station transmits a time-division multiplexed signal to a control station which performs voice processing and the like. The radio base station can also connect a new small radio base station under the control of the radio base station via a transmission path.The transmission path is divided into time slots of a certain size, A non-telephone signal such as a signal, a facsimile signal or data communication, and a control signal for performing call processing are allocated to time slots, respectively. The base station can process multiple carriers simultaneously to communicate with multiple mobile stations, and the radio signal transmitted from the radio base station is controlled via a transmission path after being received by the radio base station. In a mobile communication system in which a signal transmitted from a control station is transmitted to a radio base station via a transmission path and then transmitted to the mobile station, the radio base station can transmit and receive one carrier. And 64 kbp with the radio base station which is the control station or the master station
In the case of being connected by a transmission line for one s time slot, a voice signal, a non-telephone signal, and a control signal are multiplexed and transmitted in one time slot of the transmission line (first). Embodiment).

In another embodiment, the wireless base station has a configuration capable of transmitting and receiving three carriers, and is connected to a control base station or a wireless base station serving as a master station via a transmission line for two 64 kbps time slots. In this case, three carrier voice signals, non-telephone signals, and control signals are multiplexed and transmitted using the two time slots of the transmission line (second embodiment).

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 shows an example of the configuration of a radio base station for realizing the channel configuration method of the present invention. As shown in the figure, it is preferable that a station having a small number of carriers normally connects a new small radio base station 10 by a transmission line 9 under the control of a radio base station 8 connected by a transmission line 7. .

In a digital mobile communication system of the PDC system, a base station performs convolutional coding / decoding of a voice signal, so that one full-rate voice channel can be used in a radio section 11.2.
kbps, 7.05 kbps in the transmission path section, and one half-rate voice channel is 5.6 kb in the wireless section.
With respect to ps, transmission can be performed at 3.675 kbps in the transmission path section. For non-telephone signals, 11.2 kbps per channel at full rate is also used on the transmission line as it is.
Transmission is performed at 1.2 kbps.

Embodiment 1 In the mobile communication system shown in FIG.
In order to show an example of a configuration of a transmission path of a radio base station for realizing the embodiment of the present invention, a case where a small radio base station having a 1-carrier configuration is newly connected under a radio base station by a transmission path of 64 kbps Will be described.

FIG. 3 shows the correspondence between channels in a radio section of a radio base station accommodating one carrier and 64 kbps time slots in a transmission path. Of the six channels in the wireless section, half of the six channels are converted into two control channels (full rate), and the remaining four channels are used for voice or non-telephone communication.

A corresponding time slot in the transmission path is used as shown in FIG. Four half-rate voice channels (two channels for full-rate voice) and two non-telephone signal channels can be multiplexed in one 64 kbps time slot on the transmission line, and the rest can be used for control signals. Here, the half-rate audio area is shared with the full-rate audio, and when transmitting the full-rate audio, two channels of the half-rate audio area are used.

Embodiment 2 Next, an example of a configuration of a transmission line of a radio base station for realizing the second embodiment of the present invention will be described.

FIG. 4 shows a transmission path of a radio base station in which the number of accommodated carriers is 3 and a 64 kbps time slot 2
This is a usage form of a 64 kbps time slot in a case where the connection is made by one connection.

As described above, since the utilization rate of non-telephone signals to audio signals is at most about ten and several percent, it may be smaller than the number of audio channels. Here, it is assumed that two non-telephone channels of a wireless base station accommodating three carriers are provided.

At this time, of the two time slots, the configuration of time slot 1 is the same as the configuration shown in the first embodiment, and four channels of audio signals (two channels for full rate audio) and two channels of non-telephone signals Channels, and
Multiplex control signals.

The configuration of the time slot 2 is to multiplex and use 12 channels of the audio signal (half rate) of the carrier 2 and the carrier 3 as a dedicated slot for the audio signal. Shared with).

The non-telephone signal in the time slot 1 for two channels can be accessed from all the channels.

As described above, the transmission path between the small base station having the 3-carrier configuration and the higher-order radio base station is 64 kbp.
It can be connected by two s time slots (128 kbps).

[0033]

As described above, according to the present invention, it is possible to use a transmission line connected to a radio base station efficiently, and to achieve a special effect of reducing running costs.

In particular, the present invention is useful when configuring a transmission path between a base station modem (MDE) and a small base station (micro BS) according to a half-rate digital mobile communication system.

For example, by connecting the transmission path of the radio base station accommodating one carrier by one 64 kbps time slot, it is possible to further improve the transmission path utilization efficiency.

Further, by connecting the transmission paths of the radio base station accommodating three carriers with two 64 kbps time slots, it is possible to further improve the transmission path utilization efficiency.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a generally known mobile communication system.

FIG. 2 is a diagram illustrating an example of a configuration of a wireless base station to which the present invention has been applied.

FIG. 3 is a diagram illustrating a use form of a transmission line according to the first embodiment of the present invention.

FIG. 4 is a diagram illustrating a use form of a transmission line according to a second embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 control station 2 transmission path 3 radio base station 4 time slot 5 mobile station 6 control station 7 transmission path 8 radio base station 9 transmission path 10 small radio base station

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Yusho Tomoda 2-10-1 Toranomon, Minato-ku, Tokyo NTT Mobile Communication Network Co., Ltd. (56) References JP-A-57-184393 (JP) JP-A-59-143463 (JP, A) JP-A-5-91497 (JP, A) JP-A-7-131521 (JP, A) JP-A-6-77886 (JP, A) 5-76062 (JP, A) JP-A-7-177574 (JP, A) JP-A-8-47071 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04B 7/24 -7/26 H04Q 7/04-7/38 H04M 7/00 H04Q 11/04

Claims (2)

(57) [Claims] 1. A plurality of radio mobile stations communicate with a radio base station, and the radio base station is connected to a control station for performing voice processing or the like via a time-division multiplexed transmission path. In a mobile communication system having a new subordinate radio base station via a transmission path under its control, the subordinate radio base station having one carrier accommodates the radio base station serving as a control station or a master station by 64 kbps time. When connected by a transmission line for one slot, a voice signal, a non-telephone signal, and a control signal are multiplexed and transmitted in one said time slot. Line configuration method. 2. A plurality of radio mobile stations communicate with a radio base station, and the radio base station is connected to a control station for performing voice processing or the like via a time-division multiplexed transmission path. In a mobile communication system having a new subordinate radio base station via a transmission path under its control, the subordinate radio base station having three carriers accommodates a radio base station serving as a control station or a master station by 64 kbps time slots. Characterized in that, when connected by two transmission paths, three carrier voice signals, non-telephone signals and control signals are multiplexed and transmitted in the two time slots. Transmission line configuration method.