JP2003008531A - Tdma communication system and tdma communication method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a TDMA communication system that can reduce a delay caused at the arrival of each packet and relieve the processing load required for deciding priority of communication data. SOLUTION: In the TDMA communication system of this invention, a user station 1 and a base station 3 perform communication by using intermittent traffic slots and consecutive traffic slots, when the user station 1 receives IP data to which no TDMA slot on a TDMA channel is allocated, the user station 1 uses a signaling channel to transmit a band request message to the base station 3, then the base station 3 references a prescribed table for storing a traffic type, information of the required band, and the priority of traffic on the basis of communication traffic particularized by the received band request message to assign the TDMA slot in a direction from the user station 1 to the base station 3 and a reverse direction thereto to the IP data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a TDMA communication system and a TDMA communication method in consideration of traffic quality.

[0002]

2. Description of the Related Art A conventional communication system will be described below. As a conventional communication system, there is, for example, a communication system described in Japanese Patent Application Laid-Open No. 11-298533 "Method for bandwidth sharing in multiple access system for communication network".

In the above communication system, the remote host always sends a channel access packet to the base station when a new packet due to bursty traffic arrives in order to secure the bandwidth for future transmission. Send. On the other hand, in the case of constant bit rate traffic, the following access slot acquisition procedure is performed only once when setting up a connection. The access slot acquisition procedure is shown below.

For example, each remote host calculates a priority called "service tag value" based on the information broadcast from the base station, and transmits an access request packet to which the calculation result is added to the base station. .
The base station determines whether or not to allocate the slot based on the priority and the empty slot status, and notifies the remote host of the result of the determination. Then, when the allocation is not possible, the remote host again calculates the service tag value and transmits the access request packet to the base station by the same procedure as above.

[0005]

However, the above
In a conventional communication system, in the case of bursty traffic, each time a packet arrives at a remote host,
Since the access slot acquisition procedure occurs between networks, there is a problem that a delay occurs each time.

In the conventional communication system, neither the network nor the remote host has a means for judging whether the packet arriving at the remote host is bursty traffic or constant bit rate traffic. There was a problem.

Further, in the conventional communication system, the priority determination processing of the communication data to be transmitted requires the priority calculation in the remote host or the network and the transmission / reception of the broadcast information for this calculation. Therefore, there has been a problem that the determination of the priority becomes complicated and the processing load becomes large.

The present invention has been made in view of the above, and it is possible to reduce the delay that occurs each time a packet arrives and further reduce the processing load for determining the priority of communication data. System and TDMA
The purpose is to obtain a communication method.

[0009]

[Means for Solving the Problems]
To achieve the object, in a TDMA communication system according to the present invention, a user station accommodating a first communication network (corresponding to a LAN of an embodiment described later) to which a user terminal is connected and a second user station. It is composed of base stations connected to a communication network (corresponding to the Internet in the embodiment described later), and TDMA is provided between the user station and the base station.
A period TDMA connected by a line and composed of an intermittent traffic slot shared by a plurality of communication traffic between the user station and the base station and a continuous traffic slot occupied by a single communication traffic. Communication is performed using frames, and further, the user station
When the communication data to which the TDMA slot on the TDMA line is not allocated is received from the user terminal, the destination terminal station specific address of the communication data and the upper layer are used by using the signaling channel preset on the TDMA line. "Bandwidth request message" including the connection port number (corresponding to the destination TCP or UDP port number of the embodiment described later) of the above is transmitted to the base station, and the base station includes the received bandwidth request message. From the communication traffic specified by the terminal station specific address, refer to the database that stores the traffic type indicating whether the traffic is continuous traffic or intermittent traffic, required bandwidth information, and the priority of the traffic,
A feature is that TDMA slots for data transfer in the direction from the user station to the base station and in the opposite direction are allocated.

A TDMA communication system according to the next invention comprises a user station accommodating a first communication network to which a user terminal is connected and a base station connected to a second communication network. A station and a base station are connected by a TDMA line, and between the user station and the base station, an intermittent traffic slot shared by a plurality of communication traffic and a continuous occupied by a single communication traffic are used. Communication is performed using a periodic TDMA frame composed of dynamic traffic slots, and further, the user station transmits the TD on the TDMA line from the user terminal.
When the communication data to which the MA slot is not assigned is received, the "bandwidth" including the destination terminal station specific address of the communication data and the connection port number of the upper layer is used by using the signaling channel preset on the TDMA line. The request message "is transmitted to the base station, and the base station determines that the traffic is continuous traffic from the communication traffic specified by the terminal station specific address and the upper layer connection port number included in the received band request message. Assign a TDMA slot for data transfer in the direction from the user station to the base station and vice versa by referring to the database that stores the traffic type indicating whether the traffic is intermittent or intermittent, the required bandwidth information, and the priority of the traffic. Is characterized by.

In the TDMA communication system according to the next invention, the base station is provided with a "bandwidth allocation notification" including a traffic type, a priority, a destination terminal station specific address of communication data and a connection port number of an upper layer regarding the assigned slot. "Message" using a signaling channel preset on the TDMA line,
It is characterized in that it is transmitted to the user station.

In the TDMA communication system according to the next invention, the base station and the user station store, in a predetermined table, all information about slots allocated to communication traffic, which are described in the "bandwidth allocation notification message". It is characterized by holding.

In the TDMA communication system according to the next invention, the base station and the user station are the first
When the communication data is received from the second communication network or the second communication network, the predetermined table is referred to,
If the destination terminal station specific address of the communication data and the connection port number of the upper layer are registered, the communication data is transmitted using the corresponding allocation slot.

In the TDMA communication system according to the next invention, the base station and the user station are the first
When the communication data assigned to the intermittent traffic slot is received from the second communication network or the second communication network, the current TDMA frame counter value is added to the communication data, and the TDMA frame counter value is specified in advance based on the TDMA frame counter value. All the communication data having a maximum delay time equal to or more than the detected maximum delay time are detected, and the communication data having the maximum time difference are transmitted in order from the TDMA line.

In the TDMA communication system according to the next invention, when the base station and the user station cannot detect the communication data longer than the maximum delay time, the communication data of the communication traffic having a high priority is transmitted in order. It is characterized by

In the TDMA communication system according to the next invention, the base station and the user station receive the traffic of the communication data to which the transmission slots have been assigned, which are received from the user terminal in the first communication network and the second communication network. It is characterized in that the slot allocation is canceled when the communication data of the traffic is monitored and not received for a predetermined time or longer.

In the TDMA communication system according to the next invention, the base station and the user station are arranged such that communication data transmission requests of different communication traffics overlap in intermittent traffic slots for a predetermined threshold value or more, and If a state of a threshold value or more consecutively occurs for a predetermined number of frames, recognize the occurrence of congestion, the base station, at the stage of recognizing that congestion has occurred, the slot resource of the corresponding communication traffic. Is to be reallocated.

In the TDMA communication method according to the next invention, a TDMA line is provided between the user station accommodating the first communication network to which the user terminal is connected and the base station connected to the second communication network. Connected by T
On a DMA line, communication is performed using an intermittent traffic slot shared by a plurality of communication traffics and a continuous traffic slot occupied by a single communication traffic, and the user station further comprises: When receiving communication data to which a TDMA slot on the TDMA line is not assigned from, the signaling channel preset on the TDMA line is used to specify the destination terminal station specific address of the communication data and the connection port of the upper layer. Bandwidth request step of transmitting a "bandwidth request message" including a number to the base station, the base station, from the communication traffic specified by the terminal station specific address included in the received band request message, the traffic is Traffic that indicates continuous or intermittent traffic A slot allocation step of allocating a TDMA slot for data transfer in the direction from the user station to the base station and vice versa by referring to a database storing the type, required bandwidth information, and the priority of the traffic. Characterize.

In the TDMA communication method according to the next invention, a TDMA line is provided between the user station accommodating the first communication network to which the user terminal is connected and the base station connected to the second communication network. Connected by T
On a DMA line, communication is performed using an intermittent traffic slot shared by a plurality of communication traffics and a continuous traffic slot occupied by a single communication traffic, and the user station further comprises: When receiving communication data to which a TDMA slot on the TDMA line is not assigned from, the signaling channel preset on the TDMA line is used to specify the destination terminal station specific address of the communication data and the connection port of the upper layer. A bandwidth request step of transmitting a "bandwidth request message" including a number to a base station, and the base station is identified by a terminal station identification address included in the received bandwidth request message and a connection port number of an upper layer. From communication traffic, whether the traffic is continuous traffic or intermittent A slot allocation step of allocating a TDMA slot for data transfer in the direction from the user station to the base station and vice versa by referring to a database storing traffic type indicating traffic, required bandwidth information, and priority of the traffic. And are included.

In the TDMA communication method according to the next invention, the base station includes the traffic type, the priority, the destination terminal station specific address of the communication data and the connection port number of the upper layer regarding the assigned slot. Bandwidth allocation notification message "using a signaling channel preset on the TDMA line,
And a band allocation notifying step of transmitting the band to the user station.

In the TDMA communication method according to the next invention, the base station and the user station predetermine all the information about the slot allocated to the communication traffic, which is described in the "bandwidth allocation notification message". And an information holding step of holding the information in the table.

In the TDMA communication method according to the next invention, the predetermined table is referred to when the base station and the user station receive communication data from the first communication network or the second communication network. If the destination terminal station specific address of the communication data and the connection port number of the upper layer are registered, the data transmission step of transmitting the communication data using the corresponding allocation slot is included.

In the TDMA communication method according to the next invention, the base station and the user station receive communication data assigned to the intermittent traffic slot from the first communication network or the second communication network. In this case, a frame counter value adding step of adding the current TDMA frame counter value to the communication data, and based on the TDMA frame counter value, all communication data having a predetermined maximum delay time or longer are detected, TD in order from the communication data with the maximum time difference
And a step of detecting data transmitted on the MA line.

In the TDMA communication method according to the next invention, in the data detecting step, if the communication data of the maximum delay time or longer cannot be detected, the communication data of the communication traffic having a high priority is transmitted in order. And

In the TDMA communication method according to the next invention, the base station and the user station receive the communication data to which the transmission slots are allocated from the user terminal in the first communication network and the second communication network. And a slot releasing step of releasing the slot allocation when the traffic is monitored and communication data of the traffic is not received for a predetermined time or longer.

In the TDMA communication method according to the next invention, the base station and the user station overlap the intermittent traffic slots with communication data transmission requests of different communication traffic over a predetermined threshold value or more. , And when the state of a threshold value or more occurs continuously for a predetermined number of frames, a congestion recognition step of recognizing the occurrence of congestion, and the base station, at the stage of recognizing that congestion has occurred. , A slot reassignment step of reassigning slot resources of the corresponding communication traffic.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION The TDMA according to the present invention will be described below.
Embodiments of a communication system and a TDMA communication method will be described in detail with reference to the drawings. The present invention is not limited to this embodiment.

Embodiment 1. 1 is a diagram showing a configuration of a first embodiment of a communication system according to the present invention. Figure 1
, 1 is a user station, 2 and 4 are routers, 3 is a base station, and between each user station and the base station,
Connected by satellite, terrestrial or wired TDMA line.

FIG. 2 is a diagram showing a detailed configuration of the user station 1 and the base station 3. In the user station 1 of FIG. 2, 11 is a user line reception processing unit, 12 is an inter-station line transmission processing unit, 13 is an inter-station line reception processing unit, 14 is an address conversion table, and 15 is A slot number conversion table, 16 is a channel information table, 17 is a frame counter, 18 is a system parameter table, 19 is a traffic identifier conversion table, and 20 is an inter-station transmission waiting queue management table. , 21 is a slot allocation waiting queue, and 22 is an inter-station line transmission waiting queue. Also, FIG.
In the base station 3 of No. 3, 31 is an inter-station line reception processing unit, 32 is a network transmission processing unit, 33 is an inter-station line transmission processing unit, 34 is a slot allocation processing unit, and 35 is a frame counter. 36 is a traffic quality table, 37 is an address conversion table, 38 is a slot number conversion table, 39 is a channel information table, 40 is a traffic identifier conversion table, and 41 is a system parameter table. Is.

FIG. 3 is a diagram showing an example of a message format in the user station 1 and the base station 3. The pointer information indicates the start address of the message linked before itself when queued. For example, 0 is set when queued at the beginning. The control message display indicates whether the message is IP data or a control message (message for signaling). For example, 0 is set for the IP data and 1 is set for the control message. The queuing frame counter value sets the frame counter value when the message is queued. In the data section, when the control message display is IP data, an IP packet is set, and when the control message is a control message, message type information such as a band request message and information for each message are set. Only the data section is transferred to the interoffice line.

Now, the TDMA communication method in the above system will be described. Here, the IP (Inte
The case where rnetProtocol) data is received will be described.

Upon receiving the IP data, the user line reception processing unit 11 of the user station 1 refers to the address conversion table 14 in the memory and refers to the destination IP address and destination TCP (Transmission Control Protocol) of the IP data.
Alternatively, it is checked whether a UDP (User Datagram Protocol) port number is registered. FIG. 4 is a diagram showing an example of the address conversion table. Here, the channel identifier, traffic identifier, and priority of the channel assigned to the communication traffic are referred to from the IP addresses and port numbers of the destination and source of the received IP data.

In this case, since the received IP data is the IP data of unregistered communication traffic, it is judged that it is not registered. Therefore, the user line reception processing unit 11 queues the received IP packet in the slot allocation waiting queue 21 placed on the memory.

Then, in the user line reception processing section 11,
Based on the message format inside the station (see FIG. 3), the station number of the user station 1, the destination IP address of the received IP packet, the destination TCP or UDP port number,
A band request message including a source IP address, a source TCP or a UDP port number is transmitted to the interoffice line transmission processing unit 12. FIG. 5 is a diagram showing an example of the band request message.

The inter-station line transmission processing unit 12 refers to the channel information table 16 after determining that this message is a signaling message by displaying the control message of the received band request message, and refers to the channel type as signaling. Based on the channel identifier, the uplink frequency of the channel, the head slot number,
Search for the last slot number. FIG. 6 is a diagram showing an example of the channel information table.

Then, the inter-station line transmission processing unit 12 receives the timing information from the frame counter 17 and sets the band request message using the TDMA slot corresponding to the slot number by the uplink frequency. Only the data part (see FIG. 3) is transmitted to the base station 3.

In the inter-station line reception processing section 31 of the base station 3,
The slot number conversion table 38 is referred to from the frequency and slot number of the uplink reception slot of the received band request message to determine the channel identifier of the reception message. FIG. 7 is a diagram showing an example of the slot number conversion table. Here, the slot type and the channel identifier of the channel to which the slot belongs are referenced from the link type, frequency, and slot number of the received message. For example, if the usage flag is 0, it means unused
In the case of 1, it means that it is in use. When the slot type is 0, it represents a continuous traffic IP data slot,
In the case of 1, an IP data slot for intermittent traffic is shown, and 2 is a signaling slot.

Then, in the inter-station line reception processing unit 31, the channel information table 3 is calculated from the determined channel identifier.
9 (see FIG. 6) to recognize that the channel type is for signaling. That is, the received message is determined to be a signaling message. After that, refer to the message type information (data section) of the received message,
After recognizing that the message is a bandwidth request message, the bandwidth request message is assigned to the slot allocation processing unit 34.
Send to.

In the slot allocation processing section 34, the destination IP address and the destination TCP in the received bandwidth request message are sent.
Alternatively, the traffic quality table 36 is referred to on the basis of the UDP port number, and the traffic type, required bandwidth, and priority of the corresponding communication traffic are determined. FIG. 8 is a diagram showing an example of the traffic quality table. here,
From the IP address and port number indicating the point of the Internet to be accessed, the traffic type of communication traffic provided at that point, the required bandwidths of uplink and downlink, and the priority of traffic are referred to. Specifically, when the traffic type is 0, it represents continuous traffic, and when it is 1, it represents intermittent traffic. The above-mentioned priority represents the priority of each communication traffic, and the closer to m in the range of 0 to m, the higher the priority becomes. The required bandwidth represents the required bandwidth. Note that this table exists only in the base station.

Then, the slot assignment processing section 34 assigns the following slots to the communication traffic based on the result of the above determination.

(1) For example, when the traffic type is continuous traffic occupied by a single communication traffic,
The slot allocation processing unit 34 refers to the traffic identifier conversion table 40 and acquires one unused traffic identifier. FIG. 9 is a diagram showing an example of a traffic identifier conversion table. Here, from the traffic identifier,
The channel identifiers of the uplink (link from the user station to the base station) and the downlink (link from the base station to the user station) channels to which the traffic is allocated are referred to. The usage flag represents the allocation state of the corresponding traffic identifier. For example, 0 indicates unused and 1 indicates busy.

Next, in the slot allocation processing unit 34, the frequency f0 of the slot number conversion table 38 (see FIG. 7) is set.
It is detected whether the slot type is for continuous traffic, is continuous for a required bandwidth, and has a vacancy for each of the downlink and the uplink in order from the first slot of. If it can be detected, the channel information table 39 (see FIG. 6) is referred to, and for the uplink and downlink, one empty channel identifier for which the number of multiplexed traffic is 0 is detected. afterwards,
The channel information table 39 stores the frequencies, the leading slot numbers, the trailing slot numbers, and the used slots of the downlink and uplink consecutive empty slots detected by the slot number conversion table 38 (see FIG. 7).
It is set in the area of the channel identifier detected in (see FIG. 6).

Further, in the slot allocation processing unit 34, the number of multiplexed traffic in the channel information table 39 is set to 1 and the traffic identifier previously detected as the multiplexed traffic information is set, and the usage flag of the multiplexed traffic information is set. In use. Further, the previously detected channel identifier is set to the downlink and uplink channel identifiers of the slot number conversion table 38 (see FIG. 7), and the busy flag is set to busy. Further, the downlink and uplink channel identifiers detected previously are also set in the traffic identifier conversion table 40 (see FIG. 9). Further, in the address conversion table 37 (see FIG. 4), the IP addresses and TCP or UDP port numbers of the destination and the sender, the channel identifier, the traffic identifier, and the priority are assigned to the unused area for the downlink and the uplink. Set.

(2) On the other hand, when the traffic type is intermittent traffic shared by a plurality of communication traffics,
The slot allocation processing unit 34 refers to the traffic identifier conversion table 40 (see FIG. 9) and acquires one unused traffic identifier.

Next, the slot allocation processing unit 34 refers to the channel information table 39 (see FIG. 6) and, for the uplink, the channel is in use, the type is intermittent traffic, and the number of used slots is first. Satisfies all the conditions that it is the same as the required bandwidth determined in
Traffic from the user station has already been assigned,
Detect channel.

If a plurality of channels satisfying the above conditions can be detected, the maximum number of channels that does not exceed the current maximum number of multiplexed traffics set in the system parameter table 41 is selected. select. FIG. 10 is a diagram showing an example of the system parameter table. This table is used by the user station and the base station to perform congestion control and slot allocation processing. For example, using the limit delay time shown in the figure, when a delay occurs for more than this time, the transmission priority of the IP data is raised. In addition, when the congestion is continuously detected for the number of frames specified by the number of frames for congestion detection, the user station and the base station recognize the occurrence of congestion. The maximum traffic multiplex number indicates the maximum traffic number that can be assigned to a certain intermittent traffic slot (valid only in the base station). The queue length threshold is used when the user station or base station refers to the queue length of the inter-station line transmission waiting queue and detects the occurrence of congestion.

Then, the slot allocation processing unit 34 adds 1 to the number of multiplex traffics in the channel identifier area corresponding to the selected channel in the channel information table 39 (see FIG. 6), and obtains it as multiplex traffic information first. Added traffic identifier. In addition, the channel identifier of the acquired uplink channel is set in the traffic identifier conversion table 40 (see FIG. 9). For the downlink, the same processing as for the uplink is performed.
In addition, for both the uplink and downlink cases, the address conversion table 3 is used, as in the case where the traffic type is continuous traffic (see (1) above).
7 (see FIG. 4) is set.

In the procedure of (2) above, if the corresponding channel cannot be detected for the uplink and the downlink when referring to the channel information table 39 (see FIG. 6), the above (1) is executed. Slots are allocated in the same procedure as in the case where the traffic type shown is continuous traffic.

After the slot allocation is completed by the above procedures (1) and (2), the slot allocation processing unit 34, based on the message format of FIG. 3, allocates the traffic identifiers and channel identifiers of the assigned uplink and downlink. , Frequency of assigned slot, start slot number,
Generates an allocation notification message in which the last slot number, traffic type, priority, station number and IP address set in the received bandwidth request message, TCP or UDP port number, and message type (allocation notification) are set, and The allocation notification message is sent to the inter-station line transmission processing unit 33.
Send to. FIG. 11 is a diagram showing an example of the allocation notification message.

The inter-station line transmission processing unit 33 determines from the control message display in the received allocation notification message that it is a signaling message, refers to the channel information table 39 (see FIG. 6), and uses the downlink channel as the destination. A channel whose station number is the same as the station number in the message and whose type is a signaling channel is searched. Then, receiving the timing information from the frame counter 35, the TDM designated by the frequency of the allocated slot of the corresponding channel, the head slot number, and the tail slot number.
Using the A slot, the data part of the received message (see FIG.
(Refer to FIG. 3) is transmitted to the user station 1.

After receiving the allocation notification message from the base station 3, the inter-station line reception processing unit 13 of the user station 1 refers to the slot number conversion table 15 (see FIG. 7) and the type is a signaling channel. Recognize. Then, after recognizing that the message type in the message is allocation notification, the received message is processed by the user line reception processing unit 1.
Send to 1.

In the user line reception processing section 11, after receiving the allocation notification message, first, the address conversion table 14
In the unused area (see FIG. 4), the IP address of the destination and the sender in the received message, the TCP or UDP port number, the channel identifier of the uplink, the traffic identifier, and the priority are set. Further, the traffic identifier conversion table 19 (see FIG. 9) and the slot number conversion table 1
The content of the received message is also set for 5 (see FIG. 7). Also, the channel information table 16 (see FIG. 6)
As for the setting of multiple traffic, for example, when another traffic is not assigned to the corresponding channel, the traffic in the received message is added to the first area # 0. When the identifier is set and the area use flag is set to busy, while there is already assigned traffic, the area use flag of each area is referred to detect an unused set area, and Make settings.

Next, in the user line reception processing section 11,
Using the slot allocation waiting queue 21, the destination and the source IP address and the TCP or UDP port number set in the received allocation notification message and the matching IP data (the IP data previously queued)
To search. Then, the destination and source I of the IP data
The address conversion table 14 (see FIG. 4) is referred to based on the P address and the TCP or UDP port number to obtain the channel identifier and the priority. Then, the user line reception processing unit 11 adds a new IP obtained by adding the information obtained above and the type of IP data to the IP data.
Data is generated and the IP data is transmitted to the interoffice line transmission processing unit 12.

In the inter-station line transmission processing unit 12, since the control message display added to the received data is IP data, the inter-station line transmission processing unit 12 is based on the channel identifier and the priority added to the received message. With reference to the transmission waiting queue management table 20, the received IP data is queued in the inter-station line transmission waiting queue 22. At this time, the frame counter 17 is referenced and the frame counter value at the time of queuing is added to the queued IP data.

FIG. 12 is a diagram showing an example of an inter-station transmission waiting queue management table. Here, the information regarding the inter-station line transmission waiting queue existing for each priority of each channel is shown. Specifically, the head data address indicates the address of the IP data or control message queued at the head of the queue specified by the channel identifier and the priority. The tail data address indicates the address of the IP data or control message queued at the tail of the queue specified by the channel identifier and the priority. The queue length indicates the total number of IP data and control messages queued in the queue specified by the channel identifier and the priority. The queue length over flag is
Indicates whether the queue length exceeds the queue length threshold. For example, 0 indicates a normal state (a state where the queue length has not been exceeded), and 1 indicates a queue length threshold exceeded state. The queue length over start frame number indicates the frame number when the queue length first exceeds the queue length threshold. The queue length over count indicates how many consecutive frames the queue length exceeds the queue length threshold.

The frame counter 17 periodically notifies the inter-station line transmission processing unit 12 of the current frame counter value and slot timing. As a result, the inter-station line transmission processing unit 12 refers to the channel information table 16 (see FIG. 6) and determines the channel identifier of the channel to be transmitted next, from the notified frame counter value and timing value.

Thereafter, the inter-station line transmission processing unit 12 refers to the queue information corresponding to the channel identifier determined in the inter-station transmission waiting queue management table 20 (see FIG. 12). For example, if there is only one priority queue in the channel identifier, or if there are multiple priority queues and IP data is currently queued in only one priority queue, The IP data queued at the head of the queue is transmitted in the timing slot of the channel which is the reference result of the channel information table 16. On the other hand, when there are queues of multiple priorities in the channel identifier and IP data is queued in each queue, first, the frame counter value of all IP data is compared with the current frame counter value. Then, the time difference that is equal to or longer than the limit delay time of the system parameter table 18 (see FIG. 10) is detected, and the time difference that is the largest is transmitted.
If there is no IP data with a time difference equal to or longer than the limit delay time, the IP data queued at the head of the queue with the highest priority is transmitted in the timing slot of that channel.

In the inter-station line reception processing section 31 of the base station 3,
After receiving the IP data, the slot number conversion table 38 (see FIG. 7) is referred to from the frequency and slot number of the reception slot to determine the channel identifier corresponding to the reception message. Then, referring to the channel information table 39 (see FIG. 6) from the determined channel identifier,
It is judged that the channel type is IP data, and the received IP
The data is transmitted to the network transmission processing unit 32.

The network transmission processing section 32 transmits the received IP data to the router 4. In addition, although the case where the user station activates the slot allocation has been described in the present embodiment, the present invention is not limited to this, and the same applies to the case where the base station activates the slot allocation.

As described above, in this embodiment, since the means for judging whether the communication traffic corresponds to the bursty traffic or the constant bit rate traffic, priority is given to the IP packet to be transmitted. The processing load for determining the degree can be significantly reduced. Further, even in the case of bursty traffic, it is sufficient to acquire the slot only once at the start of communication, so that it is possible to solve the problem of the conventional technique in which a delay occurs every packet transmission. Also, when IP data assigned to an intermittent traffic slot is received from a LAN or the Internet, the frame counter value added to all IP data is compared with a predetermined limit delay time, and the time difference is the maximum. Since the IP data is transmitted in order, the transfer delay can be suppressed.
Moreover, when the IP data of the delay time limit or longer cannot be detected, the IP data of the communication traffic having the higher priority is transmitted in order, so that the data communication according to the importance becomes possible.

Embodiment 2. FIG. 13 is a diagram showing the configuration of the second embodiment of the TDMA communication system according to the present invention. Here, the case where the IP data of the new communication traffic assigned the slot is received from the router 2 will be described. The same components as those in the first embodiment described above are designated by the same reference numerals and the description thereof will be omitted.

Now, the TDMA communication method in the above system will be described. Here, only the operation different from that of the first embodiment described above will be described. Upon receiving the IP data, the user line reception processing unit 11 of the user station 1 refers to the address conversion table 14 (see FIG. 4) on the memory to refer to the destination IP address and the destination TC of the received IP data.
Check if the P or UDP port number is registered in the table. In this case, since the received IP data is the IP data of the registered communication traffic, it is determined that it is registered, and the channel identifier and the priority of the allocated channel are detected from the address conversion table 14. Then, with the two pieces of information added to the received IP data, the IP data is transmitted to the interoffice line transmission processing unit 12.

The IP by the interoffice line transmission processing unit 12
Regarding the processing after the data reception, the first embodiment described above is used.
Is the same as.

As described above, in the present embodiment, when IP data is received from the Internet or LAN, the address conversion table is referred to and the I
If the destination IP address and port number of P data are registered, the IP packet is transmitted using the corresponding allocation slot, so that data communication can be realized by simple processing.

Embodiment 3. FIG. 14 is a diagram showing the configuration of the third embodiment of the TDMA communication system according to the present invention. In FIG. 14, reference numeral 51 is a timer management unit. The same components as those in the first or second embodiment described above are designated by the same reference numerals and the description thereof will be omitted.

Now, the TDMA communication method in the above system will be described. Here, only the operation different from the above-described first and second embodiments will be described. The user station 1 and the base station 3 both have the same timer management unit 5
However, in this embodiment, the TDMA communication method will be described using the user station 1 for convenience of description.

The inter-station line transmission processing unit 12 and the inter-station line reception processing unit 13 of the user station 1 receive the first IP data # 0 related to the communication traffic after the communication traffic is assigned to a certain specific channel. In that case, a non-communication monitoring timer start request having the channel identifier and the traffic identifier as the setting information is transmitted to the timer management unit 51 that manages the timer time.

Upon receiving the request for starting the non-communication monitoring timer, the timer management unit 51 starts the non-communication monitoring timer for the designated communication traffic. Inter-station line transmission processing unit 12
Then, when the subsequent IP data # 1 is received, the inter-station line reception processing unit 13 restarts the active non-communication monitoring timer. Therefore, the non-communication monitoring timer re-establishing the channel identifier and the traffic identifier as the setting information is restarted. The activation request is transmitted to the timer management unit 51.

Upon receiving the request for restarting the non-communication monitoring timer, the timer management unit 51 restarts the non-communication monitoring timer related to the designated communication traffic. Then, when transmission or reception of IP data relating to communication traffic is interrupted, the non-communication monitoring timer is not updated and a time-out occurs. In this case, the timer management unit 51 sends to the inter-station line transmission processing unit 12 or the inter-station line reception processing unit 13 a non-communication monitoring timer timeout notification including a channel identifier designating a specific communication traffic and a traffic identifier. Send.

The inter-station line transmission processing unit 12 or the inter-station line reception processing unit 13 that has received the non-communication monitoring timer timeout notification deletes the communication traffic from the channel. Therefore, the above-mentioned address conversion table, traffic identifier table, Information regarding the traffic identifier of the corresponding communication traffic is deleted from the slot number conversion table and the channel information table. Also, if the deleted communication traffic is the last communication traffic on the assigned channel, the information on that channel is also deleted, and the slot assignment for that channel is released.

As described above, in the present embodiment, the traffic of the IP packet to which the transmission slot has been allocated is further monitored, and when the IP packet of the traffic is not received for a predetermined time or longer, the slot allocation is performed. Since it was decided to cancel
It is possible to effectively utilize communication traffic.

Fourth Embodiment FIG. 15 is a diagram showing the configuration of the fourth embodiment of the TDMA communication system according to the present invention. The same components as those in the first, second or third embodiment described above are designated by the same reference numerals and the description thereof will be omitted.

Now, the TDMA communication method in the above system will be described. Here, the first to the first embodiments described above are used.
Only the operation different from that of No. 3 will be described.

The frame counter 17 periodically notifies the inter-station line transmission processing unit 12 of the current frame counter value and slot timing. by this,
In the inter-station line transmission processing unit 12, the channel information table 1
6 (see FIG. 6), the channel identifier of the channel to be transmitted next is determined from the notified frame counter value and timing value. After that, the queue information corresponding to the channel identifier determined by the inter-station transmission waiting queue management table 20 (see FIG. 12) is referred to, and one of the following processes is performed.

First, when there are queues having a plurality of priorities in the channel identifier and the queue length of any of the queues exceeds the queue length threshold value in the system parameter table 18 (see FIG. 10), Inter-station line transmission processing unit 12
Then, the queue length over flag indicated by the corresponding channel identifier and the corresponding priority of the inter-station transmission waiting queue management table 20 is referred to. For example, when it is 0, it is judged that the queue length exceeds the queue length threshold for the first time,
The queue length over flag is set to 1, the queue length over start frame number is set to the frame number at that time, and the queue length over count is set to 1.

Secondly, there are queues having a plurality of priorities in the channel identifier, the queue length of any of the queues exceeds the queue length threshold value in the system parameter table 18 (see FIG. 10), and Long over flag is 1
If it is, the inter-station line transmission processing unit 12 determines that the queue length has exceeded the queue length threshold before, and if the queue length over start frame number is before the current frame number, Add 1 to the number of long overruns. If the queue length over count after addition is equal to the congestion detection frame count in the system parameter table 18, it is determined that congestion has occurred. Then, the re-allocation request message in which the channel identifier and the number of times of queue length over with respect to each priority queue of the channel identifier are set is transmitted to the base station 3 using the signaling slot. FIG. 16 is a diagram showing an example of the reallocation request message.

Thirdly, if there are queues having a plurality of priorities in the channel identifier and the queue length of any queue does not exceed the queue length threshold value in the system parameter table 18 (see FIG. 10), inter-station The line transmission processing unit 12 sets the queue length over flag and the queue length over frequency to 0 of each priority of the corresponding channel identifier in the inter-station transmission waiting queue management table 20 (see FIG. 12).

After performing any one of the above first to third processing, the user station 1 transmits IP data to the interoffice line at a predetermined slot timing by the same processing as in the first embodiment.

However, when the second process is performed, the base station 3 which receives the reallocation request message performs the same process as when the bandwidth request message of the first embodiment is received, and the slot allocation processing unit 34. Forward incoming messages to.

The slot allocation processing section 34 uses the channel information table 39 based on the channel identifier of the received message.
(See FIG. 6), the communication traffic multiplexed on the channel is detected. Then, from the detected communication traffic, the communication traffic corresponding to the priority whose queue length over count of each priority queue included in the received message is not 0 is specified.

Next, the slot allocation processing section 34 randomly divides the specified communication traffic into, for example, two, allocates one to the original channel, and allocates the other to the slot number as in the first embodiment. Conversion table 38 (FIG. 7)
(See FIG. 6) and the channel information table 39 (see FIG. 6), the new free channel is allocated, and the related table is updated.

When the channel reallocation is completed in this way, the slot assignment processing unit 34 issues a reallocation notification message in which all information corresponding to the original channel and the newly assigned channel is set from the channel information table 39. With the same processing as the allocation notification message in the first embodiment, it is transmitted to the user station 1 through the signaling slot. FIG. 17 is a diagram showing an example of the reallocation notification message.

In the user station 1 that has received the reallocation notification message, the address conversion table 14 (see FIG. 4), the traffic identifier conversion table 19 (see FIG. 9), the slot number conversion table 15 (see FIG. 7), the channel information table. 16 (see FIG. 6) is updated based on the content of the received message.

As described above, in the present embodiment, further, the configuration is such that the congestion related to the slot channel can be detected, and when the congestion is detected, the communication traffic of the original channel which becomes the congestion is divided into two channels. Since it is decided to divide the load, that is, to distribute the load, the congestion can be eliminated.

[0085]

As described above, according to the present invention, it is possible to judge whether the communication traffic corresponds to bursty traffic or constant bit rate traffic based on the terminal specific address. Therefore, it is possible to significantly reduce the processing load for determining the priority of the IP packet to be transmitted.

According to the next invention, it is possible to judge whether the communication traffic corresponds to bursty traffic or constant bit rate traffic based on the terminal specific address and the connection port number of the upper layer. Therefore, it is possible to significantly reduce the processing load for determining the priority of the IP packet to be transmitted.

According to the next invention, further, even in the case of bursty traffic, since it is configured that the slot can be acquired only once at the start of communication, there is a problem in the prior art that a delay occurs every packet transmission. The effect is that the points can be improved.

According to the next invention, since all the information described in the bandwidth allocation notification message is held in a predetermined table, the problem of the prior art in which a delay occurs every packet transmission is efficiently improved. There is an effect that can be done.

According to the next invention, further, when the IP data is received from the Internet or LAN, for example, by referring to the address conversion table and the destination IP address and the port number of the IP data are registered, Since the IP packet is transmitted using the corresponding allocation slot, there is an effect that data communication can be realized by a simple process.

According to the next invention, when the IP data assigned to the intermittent traffic slot is received from the LAN or the Internet, the frame counter value added to all the IP data and the predetermined delay time are added. And the IP data having the largest time difference are transmitted in order, so that the transfer delay can be suppressed.

According to the next invention, further, when the IP data of the delay time limit or more cannot be detected, the IP data of the communication traffic having the higher priority is transmitted in order, so that the data according to the importance is transmitted. This has the effect of enabling communication.

According to the next invention, the traffic of the IP packet to which the transmission slot has been allocated is further monitored,
Since the slot allocation is released when the IP packet of the traffic is not received for a predetermined time or longer, it is possible to effectively use the communication traffic.

According to the next invention, since the congestion related to the slot channel is further detected, and the communication traffic of the original channel which becomes the congestion when the congestion is detected is divided into two channels, That is, since the load is distributed, it is possible to eliminate congestion.

According to the next invention, it is decided whether the communication traffic corresponds to bursty traffic or constant bit rate traffic based on the terminal specific address. Therefore, the priority of the IP packet to be transmitted is determined. This has the effect of significantly reducing the processing load for making a decision.

According to the next invention, it is decided whether the communication traffic corresponds to bursty traffic or constant bit rate traffic based on the terminal specific address and the connection port number of the upper layer. The processing load for determining the priority of the IP packet to be processed can be significantly reduced.

According to the next invention, further, even in the case of bursty traffic, since the slot is acquired only once at the start of communication, there is a problem in the prior art in that a delay occurs at every packet transmission. The effect of being able to improve.

According to the next invention, since all the information described in the band allocation notification message is held in a predetermined table, the problem of the prior art that a delay occurs every packet transmission is efficiently improved. There is an effect that can be done.

According to the next invention, further, when the IP data is received from the Internet or LAN, for example, the address conversion table is referred to, and if the destination IP address and the port number of the IP data are registered, Since the IP packet is transmitted using the corresponding allocation slot, there is an effect that data communication can be realized by a simple process.

According to the next invention, when the IP data assigned to the intermittent traffic slot is received from the LAN or the Internet, the frame counter value added to all the IP data and the predetermined delay time are added. Since the above is compared and the IP data having the maximum time difference is transmitted in order, the transfer delay can be suppressed.

According to the next invention, further, when the IP data of the delay time limit or longer cannot be detected, the IP data of the communication traffic having the highest priority is transmitted in order, so that the data according to the degree of importance is transmitted. This has the effect of enabling communication.

According to the next invention, the traffic of the IP packet to which the transmission slot has been allocated is further monitored,
When the IP packet of the traffic is not received for a predetermined time or longer, the slot allocation is canceled, so that it is possible to effectively use the communication traffic.

According to the next invention, the congestion related to the slot channel is further detected, and the communication traffic of the original channel which becomes the congestion when the congestion is detected is divided into two channels. As a result, the congestion can be eliminated.

[Brief description of drawings]

FIG. 1 is a first embodiment of a communication system according to the present invention.
It is a figure which shows the structure of.

FIG. 2 is a diagram showing a detailed configuration of a user station 1 and a base station 3.

FIG. 3 is a diagram showing an example of a message format in the user station 1 and the base station 3.

FIG. 4 is a diagram showing an example of an address conversion table.

FIG. 5 is a diagram showing an example of a bandwidth request message.

FIG. 6 is a diagram showing an example of a channel information table.

FIG. 7 is a diagram showing an example of a slot number conversion table.

FIG. 8 is a diagram showing an example of a traffic quality table.

FIG. 9 is a diagram showing an example of a traffic identifier conversion table.

FIG. 10 is a diagram showing an example of a system parameter table.

FIG. 11 is a diagram showing an example of an allocation notification message.

FIG. 12 is a diagram showing an example of an inter-station transmission waiting queue management table.

FIG. 13 is a diagram showing a configuration of a second embodiment of the TDMA communication system according to the present invention.

FIG. 14 is a diagram showing a configuration of a third embodiment of a TDMA communication system according to the present invention.

FIG. 15 is a diagram showing the configuration of a fourth embodiment of the TDMA communication system according to the present invention.

FIG. 16 is a diagram showing an example of a reallocation request message.

FIG. 17 is a diagram showing an example of a reallocation notification message.

[Explanation of symbols]

1 user station, 2, 4 router, 3 base station, 11 user line reception processing unit, 12 inter-station line transmission processing unit, 13
Inter-station line reception processing unit, 14 address conversion table,
15 slot number conversion table, 16 channel information table, 17 frame counter, 18 system parameter table, 19 traffic identifier conversion table, 20 inter-station transmission waiting queue management table, 21 slot allocation waiting queue, 22 inter-station line transmission waiting queue, 31 Inter-station line reception processing unit, 32 network transmission processing unit, 33 inter-station line transmission processing unit, 34 slot allocation processing unit, 35 frame counter, 36 traffic quality table, 37 address conversion table, 38
Slot number conversion table, 39 channel information table, 40 traffic identifier conversion table, 41 system parameter table, 51 timer management unit.

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 5K028 AA11 CC02 CC05 HH00 KK01                       LL12 MM05 MM08 RR02                 5K030 HC01 HC14 HD03 HD06 JL01                       JL02 KA05 LC01 MB09                 5K033 CB06 CB17 CC01 DA17 DB18                 5K067 AA14 CC04 DD23 EE02 EE10                       EE71 GG01 HH21 HH22 HH23

Claims (18)

[Claims] 1. A TDMA line comprising a user station accommodating a first communication network to which a user terminal is connected and a base station connected to a second communication network, wherein a TDMA line is provided between the user station and the base station. In a connected TDMA communication system, between the user station and the base station, an intermittent traffic slot shared by a plurality of communication traffics and a continuous traffic slot occupied by a single communication traffic are used. When the user station receives communication data to which a TDMA slot on the TDMA line is not allocated from the user terminal, the signaling channel preset on the TDMA line is used. To specify the destination terminal station specific address of the communication data and the connection of the upper layer. Transmits a "band request message" including the port number to the base station, the communication traffic by the base station is identified by the included in the bandwidth request message received terminal station specific address,
Data transfer in the direction from the user station to the base station and vice versa by referring to the traffic type indicating whether the traffic is continuous traffic or intermittent traffic, required bandwidth information, and the database that stores the priority of the traffic For T
TDMA characterized by allocating DMA slots
Communications system. 2. A TDMA line is provided which comprises a user station accommodating a first communication network to which a user terminal is connected and a base station connected to a second communication network, and a TDMA line is provided between the user station and the base station. In the connected TDMA communication system, between the user station and the base station, an intermittent traffic slot shared by a plurality of communication traffic and a continuous traffic slot occupied by a single communication traffic are used. When the user station receives communication data to which a TDMA slot on the TDMA line is not assigned from the user terminal, the signaling channel preset on the TDMA line is used. To specify the destination terminal station specific address of the communication data and the connection of the upper layer. A "bandwidth request message" including a port number is transmitted to the base station, and the base station selects from the communication traffic specified by the terminal station specific address and the upper layer connection port number included in the received band request message. , The type of traffic that indicates whether the traffic is continuous or intermittent, the required bandwidth information, and the database that stores the priority of the traffic, referring to the data from the user station to the base station and vice versa. A TDMA communication system characterized by allocating a TDMA slot for transfer. 3. The base station transmits a "bandwidth allocation notification message" including a traffic type, priority, a destination terminal station specific address of communication data and a connection port number of an upper layer on a TDMA line on the TDMA line. The TDMA communication system according to claim 1, wherein the TDMA communication system transmits to a user station using a preset signaling channel. 4. The base station and the user station hold, in a predetermined table, all information about slots allocated to communication traffic, which are described in the “bandwidth allocation notification message”. Item 4. The TDMA communication system according to Item 3. 5. The base station and the user station refer to the predetermined table when receiving communication data from the first communication network or the second communication network, and identify a destination terminal station of the communication data. 5. The TDMA communication system according to claim 4, wherein if the address and the connection port number of the upper layer are registered, the communication data is transmitted using the corresponding allocation slot. 6. When the base station and the user station receive communication data assigned to an intermittent traffic slot from the first communication network or the second communication network, the current TDMA is set to the communication data.
A frame counter value is added, and based on the TDMA frame counter value, all communication data having a predetermined maximum delay time or longer is detected, and the communication data having the maximum time difference is sequentially transmitted from the TD.
The TDMA communication system according to claim 1, wherein the TDMA communication system transmits on an MA line. 7. The base station and the user station, when communication data of the maximum delay time or longer cannot be detected, sequentially transmit communication data of communication traffic having a high priority. TDMA described in
Communications system. 8. The base station and the user station monitor the traffic of communication data to which a transmission slot has been assigned, which is received from a user terminal in the first communication network or the second communication network, and monitor the traffic for a predetermined time. The TD according to any one of claims 1 to 7, wherein the slot allocation is canceled when the communication data of the traffic is not received over the above.
MA communication system. 9. The base station and the user station are configured such that a request for communication data transmission of different communication traffic overlaps an intermittent traffic slot for a predetermined threshold value or more, and a state of the threshold value or more is specified in advance. If the number of consecutive frames has occurred,
9. The TDMA communication system according to claim 8, wherein when the occurrence of congestion is recognized and the base station recognizes that congestion has occurred, the base station reallocates the slot resource of the corresponding communication traffic. 10. A TDMA line connects between a user station accommodating a first communication network to which a user terminal is connected and a base station connected to a second communication network, and a plurality of TDMA lines are connected on the TDMA line. In the TDMA communication method for performing communication using the intermittent traffic slot shared by the communication traffic and the continuous traffic slot exclusively used by the single communication traffic, the user station is When the communication data to which the TDMA slot on the TDMA line is not allocated is received, the destination terminal station specific address of the communication data and the connection port number of the upper layer are used by using the signaling channel preset on the TDMA line. Bandwidth request to send "bandwidth request message" containing And step, said base station, the communication traffic identified by the included terminal station identifying address the bandwidth request message received,
Data transfer in the direction from the user station to the base station and vice versa by referring to the traffic type indicating whether the traffic is continuous traffic or intermittent traffic, required bandwidth information, and the database that stores the priority of the traffic For T
A TDMA communication method comprising: a slot allocation step of allocating a DMA slot. 11. A TDMA line connects between a user station accommodating a first communication network to which a user terminal is connected and a base station connected to a second communication network, and a plurality of TDMA lines are connected on the TDMA line. In the TDMA communication method for performing communication using the intermittent traffic slot shared by the communication traffic and the continuous traffic slot exclusively used by the single communication traffic, the user station is When the communication data to which the TDMA slot on the TDMA line is not allocated is received, the destination terminal station specific address of the communication data and the connection port number of the upper layer are used by using the signaling channel preset on the TDMA line. Bandwidth request to send "bandwidth request message" containing Step, and the base station, from the communication traffic specified by the terminal station specific address and the upper layer connection port number included in the received bandwidth request message, the traffic indicating whether the traffic is continuous traffic or intermittent traffic A slot allocation step of allocating a TDMA slot for data transfer in the direction from the user station to the base station and vice versa by referring to a database that stores the type, required bandwidth information, and the priority of the traffic. A characteristic TDMA communication method. 12. The base station sends a "bandwidth allocation notification message" including a traffic type, priority, a destination terminal station specific address of communication data and a connection port number of an upper layer on the TDMA line by the base station. 12. The TDMA communication method according to claim 10, further comprising a band allocation notifying step of transmitting the band allocation to the user station using a preset signaling channel. 13. An information holding step of holding, in a predetermined table, all information related to slots allocated to communication traffic, which are described in the “bandwidth allocation notification message”, by the base station and the user station. The TDMA communication method according to claim 12, characterized in that. 14. When the base station and the user station receive communication data from the first communication network or the second communication network, the predetermined table is referred to and the destination terminal station of the communication data is identified. 14. The TDMA communication method according to claim 13, further comprising: a data transmitting step of transmitting the communication data using a corresponding allocation slot if the address and the connection port number of the upper layer are registered. 15. When the base station and the user station receive communication data assigned to an intermittent traffic slot from the first communication network or the second communication network, current TDMA is applied to the communication data.
A frame counter value adding step of adding a frame counter value, and based on the TDMA frame counter value, all communication data having a predetermined maximum delay time or longer is detected, and the communication data having the maximum time difference is TDM sequentially.
15. The TDMA communication method according to claim 10, further comprising: a step of detecting data transmitted on the A line. 16. The data detecting step according to claim 15, wherein if communication data of a maximum delay time or longer cannot be detected, communication data of communication traffic having a high priority is transmitted in order. TDM
A communication method. 17. The base station and the user station monitor the traffic of communication data to which a transmission slot has been assigned, which is received from a user terminal in the first communication network or the second communication network, for a predetermined time or more. 17. The TDMA communication method according to claim 10, further comprising: a slot releasing step of releasing the slot allocation when the communication data of the traffic is not received. 18. The base station and the user station are configured such that a request for communication data transmission of different communication traffics overlaps an intermittent traffic slot for a predetermined threshold value or more, and a state of the threshold value or more is specified in advance. When the number of consecutive frames has occurred,
Congestion recognition step of recognizing the occurrence of congestion, the base station, at the stage of recognizing that congestion has occurred, slot reassignment step of reassigning the slot resources of the corresponding communication traffic, characterized by including: 18. The TDMA communication method according to claim 17.