JPH02114744A - Method and apparatus for controlling line/packet border - Google Patents

Abstract

PURPOSE:To increase the band of a packet area without interrupting a line exchange call during talking by informing the revision of the assignment of a line exchange time slot to a reception side via a signaling channel when an idle takes place in the time slot for line exchange and revising border information and time slot after the notice in the same time division frame. CONSTITUTION:A control section 11 of a transmitter 1 uses a D-channel to inform the revision of a time slot to a control section 21 of a receiver 2. Then as soon as the control section 11 revises BND information, the content of an internal time slot control memory TCM is rewritten and a multiplexer circuit 12 sends a transmission frame to a transmission line 3. When a control section 21 of a receiver 2 detects the revision of BND information, the TCM is rewritten into the content noticed by signaling communication in advance. A multiplex circuit 22 revises the border and the assignment of the time slot at the same time. Thus, a time slot of C2 is shifted while its service is not interrupted and the band of a packet area is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to boundary control between communication modes in a communication system in which a circuit-switched signal and a packet signal are transmitted in a mixed manner on a time-division frame.

(Prior Art) Various studies have been made regarding user interfaces that access networks using a mixture of circuit-switched signals and packet signals. For example, there is IVDLAN access control described in B-235 of the 1986 Institute of Electronics, Information and Communication Engineers Autumn National Conference. In this method, a field BN indicating the boundary position is used in a time-division frame with a period of 12511 seconds.
D is provided.

(Problems to be Solved by the Invention) The problems will be explained using FIG. 1(a). Now, assume that two calls C1 (two-party call) and C2 (three-party call) are being serviced as circuit switching. Then, assume that C1 terminates the call. In this case, since the rear end of the circuit switching area is occupied by C2, the boundary with the packet area cannot be moved, resulting in waste.

An object of the present invention is to realize boundary control that moves the boundary with the packet area in response to the availability of the line switching area and does not affect the line call in service.

(Means for Solving the Problem) The line/packet boundary control method of the present invention is characterized in that the transmitting side and the receiving side use a communication path with a time-division frame structure consisting of a plurality of time slots for transferring user information. It has a signaling communication channel for control communication, and among multiple time slots, those used for circuit switching and those used for packet communication are grouped, and fields for boundary information indicating the boundaries are provided. This is a line packet boundary control method in a time division communication system provided in the time division frame, and when a time slot for line switching becomes vacant, the transmitting side controls the line packet boundary control method in order to allocate the vacant slot for packet exchange. A change in the allocation of line-switched time slots is notified to the receiving side via a signaling channel, and after notification, the change in the boundary information and the change in time slots are performed in the same time-division frame.

Further, the line/packet boundary control device of the present invention is comprised of a transmitting device and a receiving device, and includes a communication path having a time-division frame structure consisting of a plurality of time slots for transferring user information, and a signaling communication for control communication. a plurality of time slots, one used for circuit switching and one used for packet communication among a plurality of time slots are grouped, and a field for boundary information indicating the boundary is provided in the time division frame. In a time-division communication system, a receiving device has two circuit-switched time slot control memories, puts one in operation, and controls the other based on time slot allocation change information notified from the transmitting device through signaling communication. The changed time slot allocation information is written in the slot control memory, and the time slot control memory to be operated is switched to the other time slot control memory based on the change in the boundary information of the time division frame.

(Example) When C1 terminates the call, as shown in FIG. 1(b), C2
It is necessary to shift the time slot of
For this purpose, the following two procedures are provided.

(1) Since the transmission frame itself does not have an information field indicating time slot allocation, the receiving side is notified of the changed time slot allocation status by signaling communication using the D channel.

(2) Signaling communication is carried out at 12511 of the transmission frame.
Since it is not possible to provide control synchronized with sec, the start of changes in time slot allocation is performed in synchronization with changes in the BND signal.

An embodiment of the present invention will be described with reference to FIG.

The control unit 11 of the transmitting device 1 notifies the control unit 2 of the receiving device 2 of the time slot change using the D channel.

Note that if bidirectional communication is required for this procedure, it is performed using the D channel of the transmission path in the opposite direction shown by the dotted line. When this notification ends, the control unit 11 changes the BND information and at the same time changes the internal time slot control memory (T
CM) as shown in the lower part of FIG. By this rewriting, the multiplexing circuit 12 sends out the transmission frame shown in FIG. 1(b) to the transmission line 3. When the control unit 21 of the receiving device 2 detects a change in the END information, it rewrites the TCM to the content notified in advance through signaling communication. This allows the separation circuit 22 to change the boundaries and change the time slot assignments at the same time. Therefore, C
2 time slots can be shifted without interrupting the service, thereby increasing the bandwidth in the packet domain.

FIG. 3 is a diagram showing an example of the receiving device 2 in detail. The selector 31 divides the transmission frame into a line area and a packet area, and the distribution circuit 32 distributes the line switching signal for each call. Among the functions of the separation circuit 22 shown in FIG. 2, the selector 31 separates the packet area from the line area, and the distribution circuit 32 performs expansion of each line call. Furthermore, although supplying BND information to the register 33 is also a function of the separation circuit 22, it is shown in a simplified manner in FIG.

Selector 36, time slot control memory (TCM) 3
7, 38 and a counter 39 are for controlling the distribution circuit 32. One of the TCMs 37, 38 is in a control operating state and is switched by the selector 36. The counter 39 operates in synchronization with the frame synchronization signal SYN to
Give a read address to M. The control of this TCM itself is well known, so its explanation will be omitted. When the processor 40 in the control unit 21 is notified of the new time slot assignment through signaling communication, the processor 40 in the control unit 21 transfers it to the TCM in the standby state.
write to. On the other hand, the register 33 holds END information and supplies a control signal to the selector 31. The register 34 holds the BND information of the previous transmission frame, and the detection circuit 35 compares the values held in the registers 33 and 34, and if they are different, controls the selector 36 to switch the active TCM.

Thereby, time slot allocation can be changed in synchronization with changes in BND information.

(Effects of the Invention) It is possible to shift the time slot of a circuit-switched call in progress without interrupting it, thereby increasing the bandwidth in the packet area.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of a transmission frame, FIG. 2 is a diagram showing an embodiment of the present invention, and FIG. 3 is a diagram showing an example of a receiving device. In the figure, 1 is a transmitting device, 2 is a receiving device, 3 is a transmission path, 11.21 is a control section, 12 is a multiplex circuit, 22 is a separation circuit, 31.36 is a selector, 32 is a distribution circuit, 33.3
4 is a register, 35 is a detection circuit, 37.38 is a time slot control memory, 39 is a counter, and 4o is a processor.

Claims (2)

[Claims] (1) The transmitting side and the receiving side are connected by a communication channel with a time division frame structure consisting of multiple time slots for transferring user information and a signaling channel for control communication, and A circuit/packet boundary in a time division communication system in which those used for circuit switching and those used for packet communication are grouped, and a field for boundary information indicating the boundary is provided in the time division frame. In this control method, when a time slot for circuit switching becomes vacant, the transmitting side instructs the receiving side to change the assignment of the time slot for circuit switching via the signaling channel in order to allocate the vacant slot for packet switching. A line/packet boundary control method characterized in that the boundary information is changed and the time slot is changed in the same time division frame after notification. (2) It consists of a transmitting device and a receiving device, and has a communication path with a time division frame structure consisting of a plurality of time slots for transferring user information and a signaling communication path for control communication, In a time division communication system in which those used for circuit switching and those used for packet communication are grouped, and a field for boundary information indicating the boundary is provided in the time division frame, the receiving device It has two time slot control memories for line switching, one of which is activated and the other time slot control memory changes the time slot allocation based on the time slot allocation change information notified by the transmitting device through signaling communication. A line/packet boundary control device characterized by writing information and switching a time slot control memory to be operated to the other time slot control memory based on a change in the boundary information of a time division frame.