JPH0278328A - Multi-direction hierarchy type subscriber radio multiplex transmission system - Google Patents

Abstract

PURPOSE:To improve economy and flexibility by combining a demultiplex/ multiplex mechanism of a subscriber signal and a synthesis mechanism of a radio frame. CONSTITUTION:A subscriber radio base station terminal equipment 1 includes a station interface section 11, a subscriber signal demultiplex processing section 12, plural frame aligner sections 2-1-2-n and radio transmitter-receiver interface sections 3-1-3-n. A station signal 101 is a user signal to each subscriber station multiplexed and synthesized in time series. The station interface section 11 applies termination processing monitoring a line abnormal or the like in the direction of subscribers from the station side and converts a frame of the station signal into a radio frame signal. Moreover, the radio frame signal is converted into the station signal in the direction of the station from the subscribers and the resulting signal is sent as a station incoming signal. The subscriber signal demultiplex processing section 12 applies demultiplex processing to the subscriber signal converted in order into the radio frame by the station interface section 11 into a signal having N-fold (N is an integer) of the minimum capacity of digital transmission offered to the user.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a digital subscriber radio system, and particularly relates to a base station forming one end of a digital transmission network and a subscriber station installed on the user side of a digital transmission service. The present invention relates to a multidirectional hierarchical subscriber wireless multiplex transmission system using digital subscriber radio that connects subscriber stations with subscriber stations via wireless lines.

[Conventional technology]

Conventional subscriber wireless systems include TDMA system and point-to-point system.

The TDMA system is a system in which a service station (base station) of a telecommunications carrier that provides digital transmission services uses a wide-angle beam antenna to accommodate multiple subscribers using the same radio carrier frequency through time division multiple access. It is.

On the other hand, the two-way system is a system in which communication between the base station and subscribers is accommodated using a pair of radio carrier frequencies for each subscriber.

``Problems to be solved'' - In the TDMA system mentioned above, when the number of subscribers with large service capacity increases, the efficiency of accommodating the subscribers decreases, and the distance to the subscriber station decreases due to the wide-angle antenna characteristics. If it is long, there is a problem that the line quality deteriorates due to the influence of rain, snowfall, etc.

On the other hand, the two-to-one method is suitable when the transmission capacity is large and the transmission distance is long. However, if the number of subscribers is not so large as to apply the TDMA method, but if there are several scattered, It is necessary to prepare a transmission line, and as the number of subscribers increases, the efficiency of accommodating subscribers in the relay transmission line decreases, the scale of the opposing transmission equipment increases, and the construction cost of the central a line increases. There was a point.

The present invention has been made in view of the above-mentioned conventional problems, and by accommodating multiple subscribers in a hierarchical manner on a single relay transmission line in a time-sharing manner, it is possible to improve economical efficiency for increasing the number of subscribers and improve the efficiency of each subscriber. The purpose of the present invention is to provide an effective subscriber wireless system that compensates for the shortcomings of the conventional two-way system, without compromising flexibility in accommodating a mixture of various service speeds or changing service speeds.

[Means for Solving the Problems] In order to achieve the above object, the multidirectional hierarchical subscriber wireless multiplex transmission system of the present invention connects a subscriber station installed on the user side of a digital transmission service and one end of a digital transmission network. Configure 7iii1! ! In a digital subscriber radio system in which a subscriber station is connected to a subscriber station via a wireless line, means for mutually converting a time division multiplexed signal input from the digital transmission network and a radio frame signal, and a means for mutually converting the radio frame signal to a user of the subscriber station. means for dividing and multiplexing the divided φ multiplexed signal into integral multiples of the minimum capacity of the digital transmission service; means for transmitting and receiving the divided φ multiplexed signal to and from a radio transmitting/receiving device of the base station facing each subscriber station; a base station termination device comprising means for absorbing delay deviations of signals received from subscriber stations; a wireless transmitting/receiving device that connects the base station and the subscriber station with each other via a radio carrier wave; and a time-division signal from the base station. means for extracting own station information assigned to each column division and a timing signal synchronized with the base station signal, converting the information into a user interface signal and transmitting it;
Before synchronizing a signal from a user with the timing signal,
and a subscriber station terminal device comprising means for transmitting the radio frame to the base station according to predetermined division sections.

[Example] Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the system configuration of an embodiment of the present invention.

An intra-office signal 101 on the network side is connected from the synchronous terminal device directly or via a relay transmission path to the subscriber radio base station terminal equipment 2tl. This subscriber radio base station termination device 1 includes an in-office interface section 11, a subscriber signal separation processing section 12,
It includes a plurality of frame aligner parts 2-1 to 2-n and wireless transceiver interface parts 3-1 to 3-n.

Note that the intra-office signal 101 is obtained by multiplexing and combining user signals to each subscriber station in time series, for example, at 64 Kb/s or a constant multiple thereof.

The in-office interface unit 11 is connected from the office side to the subscriber direction (
In terms of downlink (hereinafter referred to as "downlink"), termination processing is performed to monitor line abnormalities, etc., and at the same time, in-office signal frames are converted to wireless frame signals. r (referred to as "uplink") converts a radio frame signal in which each subscriber's signal is multiplexed and combined into an intra-office frame signal and sends it out as an intra-office uplink signal.

The subscriber signal separation processing section 12 divides the subscriber signals sequentially converted into radio frames by the intra-office interface section 11 into N times the minimum capacity of digital transmission provided to the user (N is an integer).

FIGS. 2A and 2B show the frame structure of the relationship between the division process and the subscriber signals to be transmitted. here,
The maximum capacity that the local signal 101 can transmit is #6, and #
It is assumed that l to #6 have the following relationship. That is, #1
is the minimum capacity of digital transmission service, #2=#lX
3. ．． #3-#2X2, #4=#3X2, #5=#
4X2.

Let #6=#5X4.

For example, if #1 = 64 Kb/s, #2 =
192 Kb/s, # 3F, 384 Kb/s, #
4=768Kb/s, #5=1536Kb/s, #6=
It becomes 6144Kb/s.

From these relationships, the in-office signal lot is also divided into four #5s from the beginning, each #5 is divided into two #4s from the beginning, each #4 is divided into two #3s from the beginning, and each #3 is divided into two #3s from the beginning. 2 from the beginning
By dividing each #2 into three #1 from the beginning and performing multiplexing processing commensurate with the subscriber capacity to be transmitted, digital transmission services are provided to each of multiple users within the subscriber station. do.

In the illustrated example, the accommodation status of each subscriber on the radio frame is as shown in FIG. 2B.
The figure shows the case where subscriber n transmits #3 and subscriber n transmits #5 at the positions shown in the figure.

Signal 101 (#6
) is divided into four #5 at the separation section. If the user's transmission capacity is 6144 Kb/s (#6), the signal is directly transmitted to J1i's wireless transceiver interface section 3-1 without passing through the separation section. User transmission sound l is 15
In the case of a transmission capacity of 36 Kb/s or less, the following demultiplexing and multiplexing processing is performed. That is, each #5 (1536Kb/s
) is 24 a 1 (s 4KKb/s), or 8 #2 (192Kb/s), or 4 93
(384Kb/s), or two #4 (76
8Kb/s). Also #5 at 64Kb/s
It is divided into 24 channels, and numbers are assigned from the beginning.

FIG. 3 shows the transmission capacity of each user and the location and order in which they should be accommodated.

#5 has 768 Kb/s, 192 Kb/s and 64K
When transmitting digital signals for three users with a transmission capacity of 768 Kb/s, the channel number (
Hereinafter referred to as CHNo.), it is 192Kb.
/s is CHNo. 13, 64Kb/s is CHNo. 1
Accommodate in 9.

Each demultiplexer/multiplexer for each user is directly connected to its own transmission container without the need for demultiplexer/multiplexer. For example, 7
68 Kb/+ directly connects the #4 separation section and multiplex section at the accommodation position corresponding to the corresponding CH No.

192, b/s also directly connects the #2 separating section and multiplexing section at the accommodation position corresponding to the corresponding CH No. Also, 64K
b/s are accommodated in order. By accommodating the information in such a divided/multiplexed section, subsequent changes can be made easily.

In other words, 192Kb/s can be changed to 3B4Kb/s without affecting other machines, and 64Kb# is
It becomes possible to change to 192 Kb/s or 384 Kb/s.

FIG. 4 is a block diagram showing how the above-mentioned subscriber signal separation processing unit 12 performs separation and multiplexing.

Frame aligner part 2-1. . . . , 2-n are for absorbing electrical delay deviations due to differences in propagation distance between the base station and each subscriber station. The upstream signal of each subscriber station is
Frame aligner part 2-1, 2 for each wireless frame
-2, ~. The signals are stored in the memory sections 2-n, read out using a common timing signal 102, and sent to the subscriber signal separation processing section 12 in aligned frames.

Wireless transceiver interface unit 3 corresponding to each subscriber
-1. ~, 3-n multiplex frame synchronization bits, etc. to convey the reference timing of signal processing at the subscriber station,
Insert status bits to convey network status, etc., and radio maintenance bits that are control bits from the base station side such as loopback tests.

Additionally, code error check bits, etc. are multiplexed to monitor line quality in the wireless section, and scrambling processing is performed to flatten the spectrum of the wireless signal and make it easier for subscriber stations to extract the clock signal. ”-, the wireless transmitting/receiving device 4-1. ~.

4-n and transmits the S-line carrier frequency f to each subscriber station.
D1. ~． Send by fDn.

Radio transmitting/receiving device at subscriber station 5-1. ~.

5-n extracts the signal from the base station and sends the subscriber station terminal device 6-1. . . , 6-n, and extracts information on each user of the subscriber station and radio maintenance bits, and performs termination processing of the radio section.

In addition, the subscriber signals transmitted on the radio frame are passed through the corresponding subscriber's signal according to the above-mentioned separation classification, and the signals of other subscribers are suppressed by masking etc. for security. Subscriber terminal 7-1. ~, 7-n.

On the other hand, the subscriber terminal 7-1. The uplink signals from ~, 7-n are sent to the corresponding time position according to the above-mentioned separation classification, and, like the above-mentioned base station, are scrambled by adding frame synchronization bits, radio maintenance bits, etc. After that, the wireless transmitting/receiving device 5-1. ~． Sent to 5-n,
Radio carrier frequencies fu+, fu2 . ~+fL
Sent in In.

[Effects of the Invention] As explained above, according to the present invention, when there are a relatively large number of users with various service speeds,
The advantage is that the user signals of each subscriber station can be efficiently accommodated on one (or a few) intra-office interfaces.

In addition, it is possible to respond more flexibly to changes in the service speed of user signals set by the user, with less impact on other subscribers.
By combining the multiplexing mechanism and the radio frame composition mechanism, it is possible to multiplex and combine multiple user signals and transmit them to each of multiple subscriber stations. The advantage is that a highly flexible subscriber wireless system can be provided without any loss.

[Brief explanation of the drawing]

Figure 1 is a system configuration diagram of an embodiment of unreleased #j,
The figure is a frame configuration diagram showing the relationship between the division multiplexing process of the present invention and subscriber signals. FIG. 2 is a detailed block diagram showing the state of division and multiplexing. 101: Intra-office signal 1: Subscriber radio base station terminal equipment II two-office intra-office interface section 12: Subscriber signal separation processing section 21.22. ~, 2n: Frame aligner part 31.3
2-, 3n: Wireless transceiver interface section 41.42. ~, 4n, 51, 52. ~, 5n: Wireless transmitting/receiving device 6'l, 62, ~. 6n: Subscriber station terminal device 7
1.72. ~, 7n: Subscriber terminal f o+, f o? , N, f Dn:ful, f
U2. ~． fuII: Base station reception/subscriber station transmission radio carrier bee R: Radio additional signal #1. #2. ~． #5: Subscriber information

Claims (1)

[Scope of Claims] A digital subscriber wireless system in which a subscriber station installed on a user side of a digital transmission service and a base station constituting one end of a digital transmission network are connected via a wireless line, comprising: means for mutually converting a time division multiplexed signal and a radio frame signal inputted from the subscriber station; means for dividing and multiplexing the radio frame signal into integral multiples of the minimum capacity of the digital transmission service of the user of the subscriber station; means for transmitting and receiving divided and multiplexed signals to and from a wireless transmitter/receiver of the base station facing each subscriber station;
a base station terminating device comprising a means for absorbing delay deviation of a signal received from the subscriber station; a wireless transmitting/receiving device that connects the base station and the subscriber station with each other using a radio carrier wave; and a time sharing device from the base station. Means for extracting own station information and timing signals synchronized with the base station signal assigned to each divided section of the signal string, converting the information into a user interface signal and transmitting the same, and a means for transmitting the signal from the user. and a subscriber station terminal device comprising means for transmitting data to the base station according to predetermined divisions on the radio frame in synchronization with the timing signal. type subscriber wireless multiplex transmission system.