JPH08205227A - Radio communication system - Google Patents

Abstract

PURPOSE: To provide a radio communication system for improving efficiency for using the fixed number of modem parts at a conventional centralized control station for which time zones to generate the calls of mobile terminals are made different in the respective zones of plural radio parts and the fixed number of modem parts are not ordinarily used. CONSTITUTION: At arbitrary one terminal t1 on the radio part side of a distribution part 3 for m-to-1 switches for connecting (n) pieces (n>=2) of radio parts 11-1n just for transmitting/receiving the calls of radio signals as the base stations of mobile terminals PS existent in (n) pieces of radio zones from A to B-N allocated to respective (l) pieces of areas #1-#l, SW and 1 are provided for connecting any arbitrary one of (n) pieces of radio parts 11-1n more than '2' for each time zone.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the construction of a radio base station in which a mobile terminal of a so-called personal handyphone system (PHS) transmits and receives radio signal calls in a plurality of n radio zones, and particularly to the radio base station. The station does not have a modulation / demodulation unit and has a function of a wireless unit that only transmits and receives wireless signals. The modulation / demodulation unit has a plurality of m input / output terminals connected to a plurality of n wireless units of the wireless base station. A fixed number of m units are arranged in a centralized control station that is connected through a distribution unit of a switch of a pair L and controls TDMA connection with a telephone exchange, and individual wire transmission is performed between a plurality of n wireless units of the wireless base station. The present invention relates to a method of controlling a wireless base station by a centralized control station of a wireless communication system connected by road and a configuration of a control device therefor.

[0002]

2. Description of the Related Art A so-called personal handy phone system (PHS) is being planned as a wireless communication system for mobile terminals located between a mobile phone system such as a mobile phone and a cordless phone system in a subscriber's house. . this
Unlike the above-mentioned cordless telephone system, the PHS system, like the mobile telephone system, can move from the radio area covered by one base station to the radio area covered by another base station. However, unlike mobile phone systems,
The upper limit of the moving speed of the mobile terminal is expected to be about the walking speed of a human, and the radius of one wireless area is as small as about 200 m, so the mobile terminal can be made small and inexpensive. In such a PHS system, the radio base stations must be arranged at a much higher density than in the above-mentioned mobile telephone system. There is a demand that the radio base station connected to the exchange by TDMA should be small and maintainable. In order to solve this requirement, refer to the block diagram of the radio base station of the conventional PHS system in FIG. 4, and the radio base station that transmits / receives the call of the radio signal of the mobile terminal PS, modulates / demodulates it, and connects it to the exchange by TDMA control. The station is separated into a radio unit and a modulation / demodulation unit, and as shown in the system configuration diagram of FIG.
Are arranged as radio units M-BS _{1 to} M-BS ₈ of each base station of each zone A, B ─N of each region # 1 to # ₈ , and the latter modulation / demodulation unit is a radio unit of a plurality of eight base stations. Centralized control station 4 that controls M-BS
In this case, a fixed number of 8 modulation / demodulation units 41 to 48 are centrally provided, and each radio unit M-BS _{1 to} M-BS ₈ and each modulation / demodulation unit 41 to 48 are provided with a fixed number of 8 input / output terminals. A converter that converts the electrical signal E into an optical signal O through the distribution unit 3 of an 8 to 8 switch that distributes a signal from any one input (output) terminal to a maximum of eight output (input) terminals as required. It has been considered to connect with each optical cable transmission line 21 to 28 having an E / O and the opposite converter O / E.

[0003]

In the wireless communication system having such a configuration, as described in the preceding section, the wireless base station M of the mobile terminal PS has a much higher density than that in the mobile phone system. -Because it is necessary to install BS, the economic efficiency of the entire system is an important issue. Therefore, for example, the centralized control station 4 that integrally controls the radio units M-BS _{1 to} M-BS ₈ of a plurality of eight base stations
It is desirable that the eight modulation / demodulation units 41 to 48 are always operated as much as possible, that is, always handle call signals between each mobile terminal PS and the radio units M-BS _{1 to} M-BS ₈ . In the conventional system configuration shown in FIG. 5, the central control station 4 is configured to follow variations in the number of calls of the mobile terminals PS in each of the eight wireless zones A and B to N within the same time zone, following the variations in the calls. Connection between the multiple 8 modulation / demodulation units 41 to 48 and the wireless units M-BS _{1 to} M-BS ₈ of the multiple base stations.
Make sure that there are no modulator / demodulators in the 8 modulators / demodulators 41-48.
In the distribution unit 3 of the 8 to 8 switch of the central control station 4,
Centralized control is performed by controlling the connection by using a maximum of eight input signals from each of the modulation / demodulation units 41 to 48 with a fixed number of 8 as output signals to a fixed number of radio units M-BS _{1 to} M-BS ₈ . Station 4 fixed number
The use efficiency of the eight modulation / demodulation units 41 to 48 was improved. In this case, the calls made by the mobile terminals PS in the radio zones A to N of the respective radio units M-BS are the same in the time period in which the calls of the respective mobile terminals PS occur, and they fluctuate but always on average. It is assumed that the number of calls fluctuates by a fixed number of 8, but if the time zones during which calls occur in each of the wireless zones A to N are different, the number of calls is always a fixed number.
Since there is an unused modulator / demodulator in the modulator / demodulators 41 to 48 of a fixed number 8 because it is not 8, there is a constant 8 of modulators / demodulators 41 to 48 in the central control station 4 in such a case. There is a demand for a method of improving usage efficiency. An object of the present invention is to perform centralized control when the time zones in which calls of mobile terminals PS are generated in a plurality of n wireless zones respectively allocated in a plurality of L areas do not always become a constant number m of calls. It is an object of the present invention to provide a method of configuring a wireless communication system that enhances the use efficiency of the modulation / demodulation units of arbitrary plural m of the station.

[0004]

A basic configuration of a wireless communication system of the present invention for achieving the above object will be described with reference to the principle configuration diagram of FIG. 1 in a plurality of L regions (# 1 to #L). As a base station of a mobile terminal (PS) existing in each of a plurality of n wireless zones (A, B-N) allocated in each region, a plurality of n wireless units (M-BS) that only send and receive wireless signal calls. , 11 to 1n), and a fixed plurality of m modulation / demodulation units (41 to 4m) for modulating / demodulating data to be transmitted / received between the mobile terminal (PS) and the plurality of m modulation / demodulation data. (11 to 1n) The number of input / output terminals to be distributed to any number m, L m-to-L switch distribution section (3)
In a wireless communication system comprising a centralized control station (4) having the following, any one terminal (t1) on the wireless section (11 to 1n) side of the distributing section (3) is larger than 2 (n ≧ 2). ) As a 1-to-n connection for connecting any one of a plurality of n radio units (11 to 1n), specifically, as a connection by a 1-to-n switch (SW, 1), a plurality of m modulation / demodulation units The data modulated and demodulated at (41 to 4 m) are transmitted and received by the wired transmission lines (21 to 2n) individually connected to the plurality of n radio units (11 to 1n).

[0005]

According to the present invention, the 1-to-n switch (SW,
1), the radio units (11
In each radio zone 1n), for example, the occurrence of a call of the mobile terminal PS _A in the zone A of the radio unit 11, and generates a call of the mobile terminal PS _B in the zone B of the radio unit 12, such that they do not overlap in time Frequency is very low even if they have different call generation characteristics _, or even if they overlap _in time, for example, zone A of radio section 11 of the base station in the office building during working hours.
The call signal of the mobile terminal PS _{A and} the call signal of the mobile terminal PS _{B in} the zone B of the wireless unit 12 of the base station in the surrounding entertainment district or playground other than the working time Since the number of calls made at the same time is different, there are multiple central control stations 4.
The radio units connected to m modulation / demodulation units 41 to 4m are different. Therefore, by changing one of a plurality of n radio units (11 to 1n) larger than 2 selected by the switch (SW, 1) according to the time zone, a plurality of m units are distributed through the distribution unit 3 of the switch of m to L. Modulators / demodulators 41 to 4m are always used,
41 ~ 4m The time rate used is improved and it becomes economical.

[0006]

FIG. 2 shows a wireless communication according to an embodiment of claim 2 of the present invention.
The configuration of the communication system is shown. In the configuration example of FIG. 2, centralized control
Some of the eight modulators / demodulators 41 to 48 of the station 4 have an 8-to-8 switch.
Optical transmission line through each one terminal t1 to t8 of the distribution unit 3 which is a switch.
With the number n of base stations M-BS in the wireless zone connected by 21 to 28
The system configuration when the ratio is 1 to 2 (n = 2) is shown.
You. Two zones A in each of 8 regions # 1 to # 8
And zone B are the same zones as the conventional wireless zone in FIG.
It has a horn configuration. In the example of FIG. 2, the moving end of zone A
End PS_AOrigination call and zone B mobile terminal PS_BThe occurrence of a call
Means that they are mutually independent in time and not in the same time zone.
Or, or equivalent to that. Each strange
Moving two zones A and B from demodulators 41-48
Terminal PS_A， Mobile terminal PS_BToward another time zone is almost stationary
The signal (downlink signal) transmitted to the
Input to each terminal t1 to t8 of the distribution unit 3
Its input by one-to-two switch SW, 1 on the radio section 11,12 side
By switching control between output and output, the radio section of an appropriate radio base station
11 or the output signal of the switch SW, 1 is sent to the wireless unit 12.
It The output of the distribution unit 3, which is an 8-to-8 switch, is 1: 2.
The target wireless zone A via the switch (SW, 1) of
It is sent to the wireless section 11 of or the wireless section 12 of Zone B.
This one-to-two switch (SW, 1) is used to send
Either the line portion 11 or the wireless portion 12 is determined. This switch
The output signal of the switch (SW, 1) passes through the optical cable transmission lines 21 and 28.
Reach the wireless unit 11 and wireless unit 12 of the wireless base station M-BS in each region.
Reach and are transmitted as radio waves from the radio units 11 and 12,
Mobile terminal PS_AAnd mobile terminal PS_BTo each wireless line
Be done. Although the time zones are different from each other, the mobile terminal PS_AAnd mobile terminals
PS _BCall signals (uplink line
No.) passes through the optical transmission line in the opposite direction to the downlink,
Connected to the demodulators of the predetermined number 8 of modulation / demodulators 41 to 48 of the station 4.
It

FIG. 3 shows the configuration of a wireless communication system according to a third embodiment of the present invention. In the embodiment of FIG. 3, a switch (SW, 1) for switching connection of electric signals between the modulation / demodulation units 41,48 of the centralized control station 4 and the radio base stations 11,12 is a switch for optical signals.
(OSW, 1o) is provided on the optical cable transmission lines 21 and 28. With the configuration shown in Fig. 3, the optical O / electrical E conversion unit (downstream signal E / O unit and upstream signal O / E unit) on the centralized control station 4 side of the optical cable transmission lines 21 and 28 can be used. The number is 1/2 as compared with the case of the configuration of FIG. 2 (when n = 2). The flow of each downlink and uplink signal in FIG. 3 is the same as that in the case of FIG. 2, and the control of the optical switch (OSW, 1o) in FIG. 3 and its effect are the same as in the case of the embodiment of FIG.

[0008]

As described above, according to the present invention, when the call origination time period of each mobile terminal in a plurality of wireless zones is different, in a plurality of L regions (# 1 to #L), A one-to-n connection between one of the selected radio base stations among the plurality n of only the radio unit and one of the m modulation / demodulation units of the centralized control station by utilizing the generation characteristics of the call volume Switching is performed according to the call volume in each time zone, which has the effect of economically constructing the entire wireless communication system including the wireless base station and the modulator / demodulator of the centralized control station. .

[Brief description of drawings]

FIG. 1 is a principle diagram showing a basic configuration of a wireless communication system according to claim 1 of the present invention.

FIG. 2 is a configuration diagram of a wireless communication system according to an embodiment of claim 2 of the present invention.

FIG. 3 is a configuration diagram of a wireless communication system according to an embodiment of claim 3 of the present invention.

[Fig. 4] Configuration diagram of a radio base station of a conventional PHS system

[Figure 5] System configuration diagram of the conventional PHS system

[Explanation of symbols]

# 1 to #L (m) are areas of multiple L (m). 11, 12 to 1n are a plurality of n wireless zones A, B to N allocated in each area, and are the wireless section M-BS of the base station of each zone. 21,2n
Is a wired transmission line that connects the radio units 11 to 1n of a plurality of n base stations and the n outputs of the 1-to-n switch 1. 3 is an arbitrary one of a plurality of L inputs and an arbitrary one of a plurality of m outputs
A distributor of m-to-L switches that distribute and output as outputs. Four
Is a centralized control station for centrally controlling the radio units 11 to 1n of the base stations in a plurality of radio zones. 41,42 -4n are a plurality of m modulation / demodulation units that constitute the centralized control station 4. 1 receives any one of the plurality of m output signals of the distribution unit 3 as an input and a plurality of n larger than 2
It is a 1-to-n changeover switch SW that outputs as one signal of the output signal of.

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Claims (4)

[Claims] 1. A radio as a base station of a mobile terminal (PS) existing in each of a plurality of n radio zones (A, B-N) allocated in each of a plurality of L regions (# 1 to #L). A plurality of n radio units (11 to 1n) only transmitting and receiving a signal call and the mobile terminal (P
S) A fixed plurality of m modulation / demodulation units (41 to 4 m) for modulating / demodulating data to be transmitted / received to / from each of the S) and a plurality of m modulation / demodulation data to be distributed to the plurality of n radio units (11 to 1n). In a wireless communication system comprising a centralized control station (4) having a plurality of m-to-L switch distribution units (3) having an arbitrary number of output terminals, the wireless units (11 to 1n) of the distribution unit (3) Any one on the side
A plurality of terminals n (t1) that are larger than 2 (n ≧ 2) at each time slot
Of the wireless units (11 to 1n) are connected in a one-to-n connection, and the data modulated and demodulated by the plurality of m modulation / demodulation units (41 to 4m) are connected to the plurality of n wireless units (11 to 1n). ) Is transmitted and received by a wired transmission line (21 to 2n) that is individually connected to the wireless communication system. 2. An arbitrary one terminal (t1) on the radio section (11 to 1n) side of the distributing section (3) of the centralized control station (4) and the plurality of n radio sections (11 to 1n). 2. The wireless communication system according to claim 1, wherein connection with any one of the switches is performed by switching with a switch (SW, 1) of 1: n. 3. The wired transmission path (21 to 2n) is an optical fiber transmission path for transmitting and receiving an optical signal (O) obtained by converting (E / O) an electric signal (E), and a plurality of n base stations are provided. Any one of the radio units (11 to 1n) and the radio unit of the distribution unit (3) of the toll base station (4)
The switch (SW, 1) that switches the connection with any one terminal on the (11 ~ 1n) side is the optical signal optical switch (OSW, 1o) provided on the optical fiber transmission line (21 ~ 2n). The wireless communication system according to claim 1, wherein 4. The switching control of the 1-to-n switch (SW, 1) provided in the centralized base station (4) is performed by controlling each zone (A) of the radio units (11 to 1n) of the plurality n of base stations. , B─N) mobile terminal (P
The method according to claim 1, wherein the call is performed according to the call quantity of S).
The described wireless communication system.