JP2955146B2 - Communication slot control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control method for controlling a communication slot of a transceiver in a centralized base station of a TDMA (time division multiple access) wireless communication system.

[0002]

2. Description of the Related Art FIG. 4 is a block diagram showing a configuration of a centralized base station and the like based on a mobile radio communication system announced at, for example, the 1992 Spring Meeting of the Institute of Electronics, Information and Communication Engineers.
Is the public telephone network, B is the centralized base station, C is the public network A
D is a transceiver based on the TDMA system, E is a distribution switch for exchanging slots of TDMA radio signals from the transceiver D, and F is an operation of the transceiver D and the distribution switch E. A control unit for controlling, G is a power supply unit for supplying power to the equipment accommodated in the centralized base station B, H is a storage battery which is supplied uninterruptedly when external power supply to the power supply unit G is cut off, I Is a base station formed into small zone cells to improve the spatial frequency utilization efficiency of mobile communication, J is an optical communication cable connecting the distribution switch E and the base station I, and L is a transmitting / receiving antenna of the base station I.

FIG. 5 is a diagram showing the operation of the centralized base station B shown in FIG. 4. In this figure, four TDMA transceivers (hereinafter sometimes abbreviated as TRX) are used. An example of using communication slots is shown on the left half of the distribution switch E. Each TRX is configured with four slots, and in the case of the figure, four TRXs use a total of seven slots. The one shown on the right half of the distribution switch E is
This shows an example of slot distribution after the signal of the seven slots is distributed by the distribution switch E to each of four base stations (hereinafter sometimes abbreviated as BS).

Next, the operation will be described. A signal such as a voice signal from a public telephone communication network A is transmitted and received through a communication line C to a centralized base station B of the mobile radio communication system. The signal from the communication line C is converted into a TDMA wireless signal by a TDMA transceiver (TRX) D. TDMA
In general, in the wireless communication system, a plurality of communication channels use the same radio carrier frequency in a time-division manner, and in the case of the TRX input / output signal shown in FIG. 5, four communication channels share the same radio carrier. In FIG. 5, TRX-1 has two slots # 1 and # 2, TRX-2 has two slots # 3 and # 4, and TRX-4 has two slots # 6 and # 7. , TRX-3 use one slot of # 5. Input / output signals from the transceiver (TRX) D are distributed by the distribution switch E to arbitrary small zone base stations I for each slot.

FIG. 5 shows the distribution, for example, the distribution of slot # 1 of TRX-1 to BS-1, and distribution of slot # 2 to BS-3.
The signal distributed by the distribution switch E in this manner is transmitted to each base station (BS) I through a transmission line J such as an optical fiber cable, amplified by the base station I to required radiation power, and radiated from the transmission / reception antenna L. . On the other hand, the transmitting and receiving antenna L
The signal received at (1) enters the distribution switch E in the opposite direction to that described above, where the reverse slot exchange is performed, and then the signal is input to the transceiver (TRX) D.

In the communication system configured as above, it is the control unit that instructs the radio carrier and the slot number used by each transceiver (TRX) D, and instructs the slot distribution by the distribution switch E. F, and the control unit F performs collective management and instructions of such information. The power supply section G supplies power to the above-mentioned sections constituting the centralized base station B. The power section G receives AC or DC supply power from the outside and converts the power to the voltage used by each section. In general, in such a centralized base station B, a storage battery H is incorporated in the power supply section G so that it can operate even when the external power supply is cut off, and power is supplied from the storage battery H when the external power supply is cut off.

[0007]

The conventional centralized base station is configured as described above. When a transceiver is used even in one slot, the transceiver must be turned on. In this case, when the external power supply is cut off, it is necessary to supply power from the storage battery, so that the capacity of the storage battery is increased, which causes a problem that both the size and the capacity of the storage battery increase.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide a communication slot control method which can reduce the power consumption of a centralized base station and reduce the size of a storage battery. I have.

[0009]

A communication slot control method according to a first aspect of the present invention provides a method of prioritizing use of a plurality of TDMA transceivers D each time a call occurs in a centralized base station B of a TDMA wireless communication system. The control unit F fills the communication slots in order from the one with the highest rank in the communication slot, and if there is a small amount of traffic and there is an empty communication slot, the empty communication slot is concentrated in the next transceiver. The power is shut off by the switch K while the transceiver is not used for communication.

The communication slot control method according to a second aspect of the present invention includes a means for changing the priority given to the transceiver D periodically or sequentially every time a certain operation time elapses.

[0011]

In the first aspect of the invention, the control unit F of the radio base station B sequentially assigns priorities from one of the plurality of transceivers D and fills the used communication channel in the communication slot for use. By providing a transceiver that does not use a communication slot when the traffic volume is small and shutting off the power supply to the transceiver, power consumption can be reduced.

Further, in the second invention, since the priorities are switched periodically or every time a certain operation time elapses, the transceiver D used does not shift, and the life of the transceiver D is averaged.

[0013]

Embodiment 1 (corresponding to claim 1). FIG. 1 is a block diagram showing a configuration of a centralized base station and the like according to Embodiment 1 of the present invention. 1, components corresponding to those shown in FIG. 4 are given the same reference numerals, and descriptions thereof will be omitted. In FIG. 1, K is a switch as power control means for turning on / off external power supply in a transceiver D of the TDMA wireless communication system.

FIG. 2 is a diagram showing a slot use situation in the first embodiment. In FIG. 2, 31 indicates TRX-1 to TRX-1.
An example of using slots used by TRX-4 is shown.
Reference numeral 2 denotes a used slot of TRX-1, 33 denotes a used slot of TRX-2, 34 denotes a used slot of TRX-3, and 35 denotes a used slot of TRX-4. Reference numeral 36 denotes an example of using slots for exchanging slots by the distribution switch E and inputting / outputting data to / from BS-1 to BS-4.
S-1 is a used slot, 38 is a used slot of BS-2, 39 is a used slot of BS-3, and 40 is a used slot of BS-4.

Referring to FIG. 1 in connection with the usage example of the used slots in FIG. 2, TRX-1 and TRX-2 are in use, switch K is turned on to supply power, and TRX-3 is not used. And the switch K is turned off and the power supply is turned off
(Cut off) is shown.

Next, an example of use of a communication slot for improving the power consumption reducing capability, which is a feature of the first embodiment, will be described with reference to FIG. FIG. 5 also illustrates a conventional operation.
The above shows an example of using a total of seven slots, but slots # 1 and # 2 of TRX-1 are allocated to BS-1, slots # 3 and # 4 are allocated to BS-2, and a slot of TRX-2 is used. # 5 and # 6 are distributed to BS-3, and slot # 7 is distributed to BS-4 by distribution switch E, and BS-1 to BS-3 have two traffic channels in the same manner as shown in the example of FIG. , BS-4 use one traffic channel. In FIG. 2, these seven slots are all assigned to TRX-1 and TRX-2,
X-3 and TRX-4 are unused. In such an operation, in the configuration of FIG. 1, the control unit F controls the operation of the entire system, and the control unit F changes the used communication channel from the TRX-1 and TRX-2 through the public telephone communication network A and the transmission line C. This is possible when the assignment is performed preferentially, and the carrier frequency and slot assignment of each TRX, the slot replacement control by the distribution switch E, etc. are all performed.

That is, in the first embodiment, the control unit F assigns the use priorities to the transceivers D, so that the communication slots of the transceivers having the highest priority are sequentially used and the used communication channels are filled, so that the traffic amount is reduced. If there are few available communication slots, the unused communication slots are concentrated in the downstream transceiver, and the unused transceiver is shut off by switch K while the transceiver is not used for communication. I do. Thereby, the power consumption of the centralized base station B is reduced.

Embodiment 2 (corresponding to claim 2). In the first embodiment, the method of filling the used slots in order from the first transceiver (TRX-1) is shown. However, in such a method, the transceiver used is offset, and the usage frequency is low. There will be a transceiver. Therefore, as a second embodiment,
A method of changing this priority at regular time intervals is conceivable. As the fixed time interval, various methods such as fixed time, daily, weekly, etc. can be considered. As an example, TRX-1 to TRX-4 are operated according to the priority shown in FIG. 2 on one day, and the other transceivers are ordered and used from the fourth transceiver (TRX-4) as shown in FIG. I do. Alternatively, the order may be changed each time the operation time reaches a certain level. This switching can be realized by, for example, providing the control unit 6 of FIG. 1 with a timer function and switching the priority by this output. By doing so, the life of the transceiver is averaged, the frequency of failures is reduced, and maintenance is facilitated.

Embodiment 3 (corresponding to claims 1 and 2). In the third embodiment, when power can be supplied from the outside, the transceiver is operated normally as shown in FIG. 5, and when the external power is cut off, the communication slot during a call is changed to the state shown in FIG. It is possible to reduce the power consumption of the storage battery and reduce the power consumption of the centralized base station by moving the transceiver and turning off the power of the transceiver as shown in FIG. .

[0020]

As described above, according to the first aspect of the present invention, the use priorities of the transceivers of the centralized base station are given, and the communication channels to be used are buried in the communication slots sequentially from the transceiver having the highest priority. Therefore, transceivers with low priority can increase the time when power supply is not required, thereby reducing the power consumption of the centralized base station and the uninterruptible power supply when external power supply is cut off. The storage battery capacity can be reduced in size.

Further, according to the second aspect, the priority order is changed periodically or every time a certain operation time elapses.
There is an advantage that the transceivers used are not biased, the life is averaged, and the maintenance is facilitated.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a centralized base station and the like according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a slot use status in the first embodiment.

FIG. 3 is a diagram illustrating a slot use situation in a second embodiment.

FIG. 4 is a block diagram showing a configuration of a conventional centralized base station and the like.

FIG. 5 is a diagram showing a slot use state in a conventional example.

[Explanation of symbols]

 A Public telephone communication network B Centralized base station C Communication line D Transceiver (TRX-1 to TRX-n) E Distribution switch F Control unit G Power supply unit H Storage battery I Base station (BS-1 to BS-3) J Transmission line K switch (power control means) L transmitting / receiving antenna

Claims (2)

(57) [Claims] 1. A plurality of transceivers of a time-division multiple access wireless communication system, a distribution switch capable of arbitrarily distributing communication slot signals according to the above-mentioned system, a carrier frequency of the plurality of transceivers, a used communication slot, and the distribution In a centralized base station composed of a control unit for collectively controlling the operation of switches and a power supply unit for supplying power to these components, the control unit assigns priority to the use of the transceiver by the control unit. The communication channel of the transceiver with the highest transmission is used to fill the communication channel in order, and if there is an empty communication slot with a small amount of traffic, the empty communication slot is concentrated on the next transceiver and the transceiver is used. When the transceiver is not used for communication, the unused transceiver is cut off its power supply by power control means. Slot control method. 2. The communication slot control method according to claim 1, further comprising means for sequentially changing the priority given to the transceivers or every time a fixed operation time elapses.