JPH08251283A - Communication system - Google Patents

Abstract

PURPOSE: To provide a communication system which can effectively use the resources of D-channel signals and can perform the effective communication processing without deteriorating the throughput. CONSTITUTION: An adjuster(ADJ) 12 of a base station 1 performs the division, restoration, velocity conversion, phase adjustment, etc., or D-channel highway signals between a layer-2 control part 11 and the digital circuit terminating units (DSU) 13 and 14 respectively. On the other hand, an adjuster 22 of an ISDN exchange 2 performs the division, restoration, velocity conversion, phase adjustment, etc., of D-channel highway signals between a layer-2 control part 21 and the office channel units(OCU) 23 and 24 respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication system, for example, a simple mobile phone system (Personal Ha).
base station (BS) and public ISDN (Integrated Service) of the ndyphone system.
s Digital Network: integrated service digital network).

[0002]

2. Description of the Related Art In recent years, research and development of simple mobile phone systems have been advanced. This simple mobile phone system generally includes a base station (BS), a mobile station (MS), and a public ISD.
It consists of N networks.

FIG. 2 is a conceptual functional block diagram of a simple portable telephone system based on the conventional concept. In FIG. 2, two sets of basic interfaces (2B + D) are used as an interface (this is called an I ′ interface) between the base station (BS) and the public ISDN network.
Here, the B channel is user information for circuit switching and packet switching, and has a transmission rate of 64 kbit / s. The D channel is a call control signal for circuit switching or packet switching, or user information for packet switching, and has a transmission rate of 16 kbi.
t / s.

However, in FIG. 2, two D channels are not used, but one of the basic interfaces I (1) or I (2) is used, and the other D channel is a signal based on the I'interface protocol. It is not used for transmission / reception, and the I ′ interface is substantially composed of 4B + D.

[0005]

In the configuration of the simple portable telephone system as shown in FIG. 2, one D channel is not used, and the D channel resources are redundant, and Four B channels must be controlled by one D channel, and the basic interface (2
B channel throughput (thro) compared to B + D)
There was a problem that the amount of work processed by the system per unit time was decreased.

That is, control from the base station (BS) to the ISDN exchange or from the ISDN exchange to the base station (BS)
However, there is a problem that the efficiency of the exchange processing from the ISDN exchange to the mobile station (MS) deteriorates.

From the above, it is required to provide a communication system which can effectively use the resources of the D channel signal and can perform the communication processing efficiently without lowering the throughput.

[0008]

Therefore, according to the present invention, a 2B channel signal and a D channel signal are provided between a base station device that communicates with a mobile station and an ISDN exchange that performs exchange processing with the base station device. In order to transmit the basic interface signal, the base station device includes a digital line terminating unit and a layer 2 control unit, and the ISDN exchange includes a intra-station line terminating unit and a layer 2 control unit. The configuration solves the above-mentioned problems.

That is, in the communication system of the present invention, the base station device has two or more digital line termination units according to the number of two or more basic interface signals transmitted in parallel between the base station device and the ISDN exchange. The ISDN exchange also has two or more intra-station line termination units. Further, the base station device includes a first D channel signal adjustment processing unit that performs D channel signal separation or phase adjustment and multiplexing between two or more digital line terminal units and the layer 2 control unit. Furthermore, the ISDN exchange is provided with a second D channel signal adjustment processing means for performing separation or phase adjustment and multiplexing of D channel signals between two or more intra-station line termination units and the layer 2 control unit. is there.

[0010]

According to the configuration of the communication system of the present invention, the base station device has a digital line termination unit according to the number of two or more basic interface signals transmitted in parallel between the base station device and the ISDN exchange. Is provided, and the ISDN exchange is also provided with a plurality of intra-station line termination units.
By providing the D channel signal adjustment processing means and the second D channel signal adjustment processing means, the conventional problem that the D channel signal is not fully utilized does not occur, and a plurality of D channel signals transmitted in parallel are Call control and information transmission can be performed by using all of them, and communication processing can be performed efficiently without leaving D channel resources and reducing throughput.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described with reference to the drawings. "First embodiment": FIG. 1 is a block diagram of a simple mobile phone system of the first embodiment. In FIG. 1, the simple mobile phone system includes a base station (BS) 1 and an ISDN exchange 2. The base station (BS) 1 includes a layer 2 control unit 11, a coordinator (ADJ) 12, digital line terminating devices (DSU) 13 and 14, a transmitting unit 15, and a receiving unit 1.
6 and an antenna unit 17. Furthermore, I
The SDN exchange 2 includes a layer 2 control unit 21 and a coordinator (A
DJ) 22 and internal line termination units (OCU) 23, 24. The base station (BS) 1 and the ISDN exchange 2 are connected by a basic interface (2B + D) 2 line.

The characteristic configuration of the simple portable telephone system of FIG. 1 is that the base station 1 is provided with the adjuster 12 and the ISDN exchange 2 is provided with the adjuster 22. The adjuster 12 of the base station 1 performs division, restoration, speed conversion, phase adjustment functions, etc. for the respective D channel highway signals between the layer 2 control unit 11 and the digital line terminators 13 and 14. . Furthermore, the adjuster 22 of the ISDN exchange 2 performs division, restoration, speed conversion, phase adjustment functions, etc. for the respective D channel highways between the layer 2 control unit 21 and the intra-station line termination boards 23, 24. is there.

The layer 2 control unit 11 performs layer 2 processing, specifically, performs link setting for message transfer, error control, etc. More specifically, connection setting, frame transfer, Sequence control, error detection,
This is performed by a D channel signal that performs error recovery and flow control. Digital line terminators 13, 14
Outputs the 2B channel signal and the D channel signal to the subscriber line by ping-pong transmission. Further, the signal from the subscriber line is separated and output into a 2B signal and a D channel signal.

The transmitting unit 15 transmits the B signal, the control signal and the like from the antenna unit 17 to the mobile terminal (MS). The receiving unit 16 receives the B signal and the control signal from the mobile terminal and gives them to the layer 2 control unit 11.

The intra-station line termination boards 23 and 24 separate the signal from the subscriber line into a 2B signal and a D channel signal and output them. Also, the 2B channel signal and the D channel signal are output to the subscriber line by ping-pong transmission. Layer 2 control unit 21
Performs layer 2 processing, specifically, performs link setting for message transfer, error control, etc. More specifically, connection setting, frame transfer, sequence control, error detection, error recovery , D channel signal for flow control, etc. (system operation): (1) First, the base station 1 to the IS
The flow (operation) of signal processing to the DN exchange 2 will be described. First, the 32 kbit / s D channel highway signal output from the layer 2 control unit 11 of the base station 1 is given to the adjuster 12. The adjuster 12 divides the input 32 kbit / s highway signal into two 16 kbit / s D-channel highway signals that can be processed by the digital line terminators 13 and 14 and outputs them. In the digital line terminators 13 and 14, the regulator 12 is used.
A 16 kbit / s D-channel highway signal and a 2B channel highway signal obtained from the above are given, and the basic interface (2B +
D) The signal is output to the subscriber line to the ISDN exchange 2.

Intra-station line termination board 23 of ISDN exchange 2,
24, the basic interface from the subscriber line (2B +
D) When two sets of signals are given, they are separated and output into a 2B channel signal and a D channel signal, and two D channel highway signals of 16 kbit / s are given to the adjuster 22. The two D-channel highway signals supplied to the adjuster 22 are phase-adjusted, formed to restore one highway signal of 32 kbit / s, and supplied to the layer 2 control section 21. Restored 32kbit /
The layer 2 processing is executed by the layer 2 control unit 21 for the D channel highway signal of s.

(2) Next, the signal processing operation from the ISDN exchange 2 to the base station 1 will be described. ISDN exchange 2
32 kbit from the layer 2 control unit 21 with the adjuster 22 of
The / s D-channel highway signal is divided into two to be two 16 kbit / s D-channel highway signals. These D channel highway signals are given to the intra-station line termination boards 23 and 24. Two 16 kbit / s D-channel highway signals and two 2B-channel signals are given, and two basic interface (2B + D) signals are generated by ping-pong transmission to the digital line terminal devices 13 and 14 of the base station. Given.

The two basic interface (2B + D) signals are sent to the digital line terminators 13 and 14 and are respectively 2B.
The channel signal and the D channel highway signal of 16 kbit / s are separated, and the D channel highway signal is given to the adjuster 12. The two 16 kbit / s D-channel highway signals are phase-adjusted by the adjuster 12 to 1
It is restored to the 32 kbit / s D-channel highway signal of the book.

32 kbit / s to 16 kbit of the D channel highway signal in the above-mentioned adjusters 12 and 22
/ S 2 divisions, 2 16kbit / s to 32k
When restoring to bit / s, TSSI (Time
Slot Sequence Integrity) is guaranteed. This TSSI guarantees the time order of the time slots.

(Detailed configuration of the adjuster (ADJ)):
FIG. 3 is a detailed functional block diagram of the adjusters (ADJ) 12, 22. In FIG. 3, the regulator is a divider (DI
V) 101, a restorer (RSTR) 102, and a phase adjustment circuit 103. (1) First, in the direction from the base station to the ISDN exchange 2, the D channel highway signal of 32 kbit / s output from the layer 2 control unit 11 of the base station is input to the time slot TS in the divider 101.
2n bit strings (0, 2, 4, 6) in (0-7) and (2
(n + 1) bit string (1, 3, 5, 7) and is divided into two 16 kbit / s D-channel highway signals, and the digital line terminators 13, 1
4 (or intra-station line termination boards 23, 24).

(2) On the other hand, in the direction from the ISDN exchange 2 to the base station 1, the digital line terminators 13 'and 14' connect the ISDN exchange 2 with 2 from the intra-site line termination boards 23 and 24.
2n bit string (0, 2, 4, 6) of the book basic interface signal (2B + D) and (2n + 1) bit string (1,
The two 16-kbit / s D-channel highway signals (3, 5, 7) are subjected to phase adjustment by the phase adjustment circuit 103 and then restored by the restorer 102 to obtain 32 kbit / s of D.
The channel highway signal is reproduced, and the layer 2 control unit 1
It is given to 1.

(Effects of the First Embodiment): According to the first embodiment described above, the base station 1 and the ISDN exchange 2 are adjusted to perform division, restoration, speed conversion, phase adjustment functions, etc. for the D channel highway signal. By providing the devices 12 and 22, the base station 1 and the ISDN exchange 2 are provided with the layer 2 control units 11 and 21 of 1 respectively, and the digital line termination devices 13 and 14 and the intra-station line termination boards 23 and 24 are provided. Since both of the transmission paths between and can also transmit the D channel highway signal, it is possible to use the D channel resources without exhaustion and to use the D channel efficiently without lowering the throughput. There is.

[Second Embodiment]: FIG. 4 is a block diagram of a simple portable telephone system according to a second embodiment of the present invention. First mentioned above
In the embodiment, the B channel accommodated by one base station is 4B.
Although it is a channel, if you want to further increase the number of channels to 4B or more, control with a 16kbit / s D channel.
The conventional problems cannot be solved. In FIG. 4, one base station is constructed so as to accommodate 8B channels, that is, eight mobile terminals.

Therefore, in the simple portable telephone system of FIG. 4, it is composed of a base station 1A and an ISDN exchange 2A, and the base station 1A has a layer 2 control section 11A and an adjuster (A
DJ) 12A and digital line terminators 13A to 13
B, 14A to 14B, a transmitter 15A, and a receiver 16A
The ISDN exchange 2A includes a layer 2 control unit 21A, a coordinator 22A, and intra-station line termination boards 23A to 23B and 24A to 24B.

In the base station 1A, the layer 2 control unit 11A
And digital line terminators 13A to 13B and 14A to 1
Divide between 4B and D channel highway signal
Adjuster 12A having restoration, speed conversion and phase adjustment functions
It is provided with. Furthermore, in the ISDN exchange 2A,
Layer 2 control unit 21A and intra-station line termination boards 23A-23
Between B and 24A to 24B, an adjuster 22A having a function of dividing / restoring the D-channel highway signal, speed conversion and phase adjustment is provided.

(System Operation): (1) First, the operation of transmitting a signal from the base station 1A to the ISDN exchange 2A will be described. First, the layer 2 control unit 11 of the base station 1A
The 64 kbit / s D channel highway signal output from A is provided to the adjuster 12A. This 64kbi
The t / s D channel highway signal is divided by the adjuster 12A into four 16 kbit / s D channel highway signals which can be processed by the digital line terminators 13A to 13B and 14A to 14B.
3B, 14A-14B.

These digital line terminal devices 13A to 1
In 3B and 14A to 14B, four basic interface signals (2B + D) are transmitted for ping-pong transmission by using four 16 kbit / s D channel highway signals from the adjuster 12A and four 2B channel signals, respectively. It is generated and given to the intra-station line termination boards 23A-23B and 24A-24B of the ISDN exchange 2A through the subscriber line.

Intra-station line termination board 23 of ISDN exchange 2A
In A to 23B and 24A to 24B, the basic interface signal (2B + D) from the four subscriber lines is separated into the 2B channel signal and the D channel signal, which is 16 kbit.
/ S four D-channel highway signals
Give to A. The four 16-bit / s D-channel highway signals are phase-adjusted by the adjuster 22A to be 64 kb.
One D-channel highway signal of it / s is formed and given to the layer 2 control section 21A.

From 64 kbit / s to 16 kb of the D channel highway signal in the above-mentioned adjusters 12A and 22A.
it / s 4 divisions, 4 from 16 kbit / s to 6
The TSSI is guaranteed even when restored to 4 kbit / s.

(Detailed Structure of Adjusters (ADJ) 12A, 22A): FIG. 5 shows the adjusters 12A, 22 of the second embodiment.
It is a detailed functional block diagram of A. In FIG. 5, the adjuster includes a divider (DIV) 101A and a restorer (RST).
R) 102 and a phase adjustment circuit 103. (1) First, in the direction from the base station 11A to the ISDN exchange 2A, the D channel highway signal of 64 kbit / s output from the layer 2 control unit 11A of the base station 1A is time slot TS (0 to 7) in the divider 101A.
4n (0, 4) bit string in (4n + 1) (1, 5)
Bit string, (4n + 2) (2, 6) (bit string), (4
n + 3) (3, 7) bit string is extracted and divided into four 16 kbit / s D channel highway signals, and digital line terminators 13A to 13B and 14A to
14B (or intra-station line termination board 23A-23B, 24A-
24B).

(2) On the other hand, in the direction from the ISDN exchange 2A to the base station 1A, the digital line terminators 13A'-1.
4 from 3B ', 14A'-14B' from the intra-station line termination boards 23A-23B, 24A-24B of the ISDN exchange 2A
4n (0, 0) of the basic interface signal (2B + D) of the book
4) bit string, (4n + 1) (1, 5) bit string, (4
n + 2) (2, 6) (bit string), (4n + 3) (3,
7) Four 16 kbit / s D-channel highway signals such as bit strings are phase-adjusted by the phase adjustment circuit 103A and then restored by the restorer 102A to 64 kbit / s.
The D channel highway signal of s is reproduced and given to the layer 2 control section 11A.

(Effects of the Second Embodiment): According to the second embodiment described above, the base station 1 is operated in the same manner as the above-mentioned first embodiment.
A, the ISDN exchange 2A and the adjusters 12A and 22A for performing division, restoration, speed conversion, phase adjustment functions, etc. for the D channel highway signal are provided, so that the base station 1A,
The ISDN exchange 2A and the layer 2 control units 11A and 21A, respectively, are provided for the ISDN exchange 2A and the digital line terminal 1
3A to 13B, 14A to 14B and intra-office line termination board 23A
23B and 24A to 24B, the D channel highway signal can be transmitted through all four subscriber line transmission lines, so that the resources of the D channel can be fully used and the D channel can be efficiently used without lowering the throughput. There is an effect that can be used.

That is, it can be constructed so as to accommodate eight mobile terminals by four D-channel highway signals.

(Other Embodiments) (1) In the above first embodiment, the D channel highway signal is set to 32.
The bit rate is set to kbit / s and the division rate is set to 16 kbit / s. However, the present invention is effectively applied without being limited to these transmission rates. Also, in the above-described second embodiment, the D channel highway signal can be applied without being limited to 64 kbit / s.

(2) Further, in the above-mentioned FIG. 1, FIG. 4, etc.,
Although the control up to layer 2 is shown, specifically, in addition to the layer 2 control unit, layer 3 (call control) (ITU-T
Recommendation Q. It is also preferable to include a control unit (according to the specifications of 931).

[0036]

As described above, according to the present invention, the base station device has a digital line terminating unit depending on the number of two or more basic interface signals transmitted in parallel between the base station device and the ISDN exchange. In addition to the two or more, the ISDN exchange also includes two or more intra-station line terminating units, and the base station device separates D-channel signals or performs phase adjustment and multiplexing between two or more digital line terminating units and the layer 2 control unit. The ISDN exchange includes a first D-channel signal adjustment processing unit for performing the second D-channel signal separation or phase adjustment and multiplexing between two or more intra-station line terminating units and the layer 2 control unit. By providing the D channel signal adjustment processing means,
It is possible to realize a communication system that effectively uses the resources of the D channel signal and efficiently performs communication processing without lowering the throughput.

[Brief description of drawings]

FIG. 1 is a functional configuration diagram of a simple mobile phone system according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a conventional portable telephone system.

FIG. 3 is a functional configuration diagram of an adjuster (ADJ) of the simple mobile phone system according to the first embodiment.

FIG. 4 is a functional configuration diagram of a simple mobile phone system according to a second embodiment.

FIG. 5 is a functional configuration diagram of an adjuster (ADJ) of a simple mobile phone system according to a second embodiment.

[Explanation of symbols]

1 ... Base station (BS), 2 ... ISDN exchange, 11, 11
A ... Layer 2 control unit, 12, 12A, 22, 22A ... Adjuster (ADJ), 13, 13A, 14, 14A ... Digital line terminating device (DSU), 15, 15A ... Transmitter, 1
6, 16A ... Receiving unit, 23, 23A, 24, 24A ... Intra-station line terminating unit (OCU), MS ... Mobile station (mobile terminal).

Claims (1)

[Claims] 1. A 2B is provided between a base station apparatus that communicates with a mobile station and an ISDN exchange that performs exchange processing with the base station apparatus.
In order to transmit a basic interface signal composed of a channel signal and a D channel signal, the base station device includes a digital line terminating unit and a layer 2 control unit, and the ISDN exchange includes an intra-station line terminating unit and a layer 2 control unit. In the system, according to the number of two or more basic interface signals transmitted in parallel between the base station device and the ISDN exchange, the base station device is equipped with two or more digital line termination units and is ISD.
The N switch also includes two or more intra-station line termination units, and the base station device performs the first D-channel signal separation or phase adjustment and multiplexing between the two or more digital line termination units and the layer 2 control unit. The ISDN exchange includes a D channel signal adjustment processing unit, and the ISDN exchange performs a second D channel signal adjustment for performing D phase signal separation or phase adjustment and multiplexing between two or more intra-station line termination units and the layer 2 control unit. A communication system comprising processing means.