JPH02158223A - Radio communication control system - Google Patents

Abstract

PURPOSE:To attain the effective utilization of a radio channel by setting part or all of an idle communication channel as a call control channel when any idle communication channel exists. CONSTITUTION:In the case of making an outgoing or an incoming call through the use of a common control channel, when an idle communication channel exists, part or all the channel is used as a call control channel, and when no idle communication channel exists, the call control channel is not provided and the call control is interrupted. For example, idle communication channels exist as shown in figure (b), channels 7b, 7c, 8b, 8c are set as the call control channel in all the channels and when all communication channels 9b-9e and 10b-10g are busy as shown in figure (c), since no channel to be assigned to the communication exists even with the reception of an outgoing/incoming signal, no outgoing/incoming control is required. Thus, the utilizing effect of the radio channels is enhanced.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a wireless communication system in which a wireless base station has a plurality of wireless channels for performing call control and communication with wireless terminal stations under its control. , a radio having means for increasing the transmission efficiency of transmitted information from a wireless terminal station to a wireless base station and the connection rate of communication between an s#I base station and a wireless terminal station by efficiently operating the wireless channel. This relates to communication control methods.

In this specification, the term "channel J (also referred to as rj Wi line channel)" is used, but its specific meaning is "frequency" in the case of frequency division multiple access system;
In the case of a time division multiple access system, it is a "time slot", and the present invention can be implemented with the same configuration in both the frequency division multiple access system and the time division multiple access system.

[Conventional technology]

Part 1 FIG. 7 is a diagram showing the configuration of a normal wireless communication system consisting of a wireless base station and a plurality of wireless terminal stations.

As shown in FIG. 7, in the case of a wireless communication system in which a plurality of wireless terminal stations 2&~2C exist under the wireless base station 1 in a wireless zone, in addition to the communication channel, the outgoing and receiving calls from the wireless terminal stations 2a~2c are There is a method in which at least one incoming control channel and one outgoing control channel are each set as control channels for control, and the control channels are time-divided and shared by a plurality of wireless terminal stations.

The wireless terminal station in the incoming call standby mode receives the incoming call control channel of the wireless zone in which it is located. FIG. 8 shows an example of the signal configuration of the downlink incoming control channel from the wireless base station to the wireless terminal station.

The terminal station without #lI receives the incoming call information (P+, P2, P--
..., PL) If incoming information to the own station is detected during 3a to 3d, incoming call control is performed, and after the wireless base station specifies a communication channel, communication is performed on the communication channel.

During the incoming call standby mode, if an instruction to send a call request is received from a subscriber of a wireless terminal station, the call information is sent by randomly accessing the uplink call control channel from the non-#l terminal station to the wireless base station.

The uplink transmission control channel is based on the base station information (B3... Bj
) 4a t 4b to notify the wireless terminal station in advance. Access methods for wireless terminal stations include the Aloha method, the slotted Aloha method, and the like.

The wireless terminal station and the wireless base station perform transmission control using the transmission control channel, and after the wireless base station specifies the communication channel, perform communication using the communication channel.

Conventional method 1 explained above. FIG. 9 shows the call control 70- of the wireless terminal station.

Additionally, if the wireless terminal station is mobile and needs to register the location of the wireless zone in which the wireless terminal station is located, the location registration information is transmitted through the uplink transmission control channel from the wireless terminal station to the fi#i base station. Sent with random access.

Part 2゜The above conventional method part 1. In this section, we have shown a method of providing a dedicated common control channel other than a communication channel to control the call origination and reception of multiple wireless terminal stations using one channel. There is also a method of performing individual control.

The wireless terminal station has means for distinguishing between empty channels that are not used for communication, and the wireless terminal station that is waiting for an incoming call,
The free downlink channels are switched cyclically and received sequentially. No # [Incoming call information to the terminal station is transmitted using one of the downlink free channels. The wireless terminal station has means for distinguishing the channel through which the incoming information is transmitted, and when the incoming information is transmitted, it interrupts the circulation of the receiving channel and receives the channel through which the incoming information is transmitted.

When a wireless terminal station receives incoming call information to its own station, it transmits incoming call response information on the uplink channel corresponding to the channel, performs incoming call control, and performs communication using the channel. If it does not apply to your own station, restart the circulation of the above reception channels.

Transmission information from the #less In/I terminal station is transmitted to the radio base station using an uplink free channel, and transmission control and communication are performed using this channel.

Conventional method 2 explained above. FIG. 10 shows the call control flow for the non-#a terminal station.

Conventional method explained above 3° for rice, part 1. Part 2. In addition, there are also methods that combine these.

In other words, an incoming call control channel is set as a control channel for controlling incoming calls at a wireless terminal station, and the incoming call control channel is used to perform common incoming control for multiple non-aS terminal stations. This is a method that controls each station's transmission individually.

The wireless terminal station in the incoming call waiting mode receives the downlink incoming call control channel of the wireless zone in which it is located. When a wireless terminal station receives incoming call information to its own station, it performs incoming call control using an uplink incoming control channel, and after the wireless base station designates a communication channel, it performs communication on that channel.

The wireless terminal station has a means for determining an empty communication channel, the transmission information from the wireless terminal station is transmitted to the wireless base station using the uplink empty communication channel, and the transmission control is performed using the communication channel, Communication is performed using the communication channel.

Conventional method 3 explained above. FIG. 11 shows the call control flow for the non-#I terminal station.

[Problem to be solved by the invention]

Conventional method 1 mentioned above. In this system, at least 61 channels are each used for outgoing control and incoming call control, so in wireless zones where communication traffic is low, the frequency of outgoing and incoming calls is low, and the wireless channels are unnecessarily monopolized.

In a wireless zone with a large amount of communication, if there is no free communication channel, there is a drawback that the control channel is wasted because no communication is possible even if calls are received and received on the common control channel. *In addition, because the channels through which calls are made from wireless terminal stations are limited, the collision rate of random access increases, and in order to increase the call completion rate, it is necessary to retransmit the outgoing signal, which increases outgoing connection delay. There were drawbacks.

Conventional method 2. Part 3. Since this is an individual control method in which a single radio channel is monopolized by a call from a single radio terminal station, there is a drawback that even if the call connection fails, the radio channel is unnecessarily occupied for a certain period of time.

In addition, as a method for the wireless terminal station to search for an empty channel within the P& line zone when transmitting a call request, the wireless terminal station memorizes all wireless channels within the wireless zone and cyclically switches the channels for reception. Then you need to find a free channel. If there are a large number of radio channels within a radio zone, this has the disadvantage that the outgoing connection delay increases in order to find a free communication channel.

Furthermore, if a wireless terminal station has the possibility of moving to another wireless zone within a service area, it is necessary to change the memory contents each time it moves, or to first memorize all wireless channels within the service area. However, when a large number of wireless zones exist within a service area, or when a new wireless zone is set within a service area, there is a drawback that control to find an empty communication channel is difficult.

Also, conventional method 3. Now, as a method for a wireless terminal station to search for an empty channel, there is a method in which the wireless base station broadcasts all vacant communication channels on an incoming call control channel, and the wireless terminal station receives the broadcast information to know the vacant communication channels. If there are a large number of wireless channels within a wireless zone, the broadcast information becomes large and the proportion of exclusive use of the incoming control channel increases.

SUMMARY OF THE INVENTION An object of the present invention is to provide a wireless communication control method that solves the above-mentioned drawbacks and improves the efficiency of using wireless channels by performing efficient call control.

[Means to solve the problem]

According to the invention, the above objects are achieved by the means specified in the claims.

That is, in the present invention, a service area is composed of one or more wireless zones, each wireless zone is equipped with a wireless base station, a plurality of bear #l terminal stations are present in the wireless zone, and the wireless base In a wireless communication system in which a station is equipped with multiple wireless channels for controlling and communicating incoming and outgoing calls with subordinate wireless terminal stations, a W& line base station divides the wireless channel into an incoming control channel and a communication channel. Among the communication channels, part or all of the vacant communication channels that are not used for communication are set as a common transmission control channel for controlling transmission of multiple 1#il terminal stations, and incoming calls to non-Medium terminal stations are Control Channel: Transmissions from M-less terminal stations are performed using the above-mentioned outgoing control channels, and when a wireless base station starts communication with a wireless terminal station in the dark, it uses one of the above-mentioned vacant communication channels including the outgoing control channel. This is a wireless communication control method in which a communication channel is set up from the network and communication is performed using the communication channel.

[For production]

In a wireless communication system that uses a common control channel to make and receive calls from a wireless terminal station, when there is an empty communication channel, part or all of the channel is used as a calling control channel; If there is no free space, the system is configured to have no outgoing control channel and to suspend outgoing control.

〔Example〕

FIG. 1 is a diagram illustrating the operation of the wireless communication control system of the present invention, and (A) in the same figure shows the wireless channel when a non-#l terminal station makes and receives calls using a common control channel in the conventional system. A configuration diagram, FIG. 3(b) is a wireless channel configuration diagram when there is an empty communication channel in the wireless communication control method of the present invention,
FIG. 3(c) shows a radio channel configuration diagram when there is no free communication channel and it becomes necessary to use another communication channel in the radio communication control system of the present invention.

First, the case where there is an empty communication channel as shown in FIG. 1(b) of pltJ1 will be explained in comparison with the conventional method shown in FIG. 2(a), and the case where there is no empty communication channel as shown in FIG.

That is, conventionally, as shown in FIG. 5c, 5d, 6ct 6
Although the channel configuration was constant even when d existed,
In this method, as shown in FIG. 6(b), among the outgoing control channels, the channel
Set as the outgoing control channel.

In FIG. 1(b), the wireless terminal station in the incoming call waiting mode receives the incoming call control channel 7a of the 81 wireless zone.

When the wireless terminal station detects incoming call information to its own station, the wireless terminal station performs incoming call control, and after receiving the designation of a communication channel from the wireless base station, performs communication on the channel.

The uplink outgoing control channel is the downlink incoming control channel 8.
The information is broadcast based on the base station information in a (information indicated by reference numerals 4m and 4b in FIG. 8).

If an instruction to send a call request is received from a subscriber of a non-M mobile terminal station while waiting for an incoming call, the non-M mobile terminal station refers to the above base station information and transmits an uplink call control channel 7b* or 7c. Send outgoing information by random access. Access methods for wireless terminal stations include the Aloha method, the Slot 2 Tedo Aloha method, and the like.

Transmission control is performed using the transmission control channel 7b* or 7c, and after specifying a communication channel, communication is performed using the specified communication channel.

If multiple channels are required as communication channels, the required number of channels is reported to the wireless base station during call control, and the wireless base station allocates the required number of communication channels.

In addition, if the wireless terminal station has mobility and needs to register the location of the radio zone in which the full AQ terminal station is located, the location registration information is transmitted from the wireless terminal station to the wireless base station on the uplink transmission control channel 7b. Or it is sent by randomly accessing 7C.

Moreover, FIG. 2 shows a block configuration diagram explaining the operation of the wireless base station, in which lla to 11d are transmitting devices, 12
a to 12d are receiving devices, 13a to 13d are signal processing units,
14 is an incoming call processing unit, and 15 is a channel pipe I! J, part, 16
represents a transmission processing section.

In the downlink incoming control channel, the incoming call information to the non-#a terminal station received by the incoming call processing unit 14 and the base station information regarding the outgoing control channel managed by the channel management unit 15 are encoded in the signal processing unit 13 &, Notification is made from the transmitting device 11a. When an empty communication channel is used as a transmission control channel, the channel is managed by the channel management section 15.

The incoming call response information from the wireless terminal station is received by the receiving device 12a and transmitted from the signal processing unit 13a to the incoming call processing unit 14, and when the M-less terminal station uses a communication channel, it is specified by the channel management unit 15. Use channels.

The transmission information from the non-mQ terminal station is received by the uplink transmission control channel receiving device 12b managed by the channel management section 15, and transmitted from the signal processing section 13b to the transmission processing section 16, and the transmission response information is transmitted to the transmission processing section 16. 16 to signal processing section 13b
and transmitted from the transmitting device 11b on the downlink transmission control channel. When using a communication channel, the channel specified in the channel W padding section J5 is used.

Of course, it is also possible to substitute these circuit configurations with software means.

FIG. 3 shows the call control 70- of the focal line terminal station when there is an empty communication channel in this method described above.

Next, a case where there are no free communication channels will be explained.

As mentioned above, FIG. 1(c) shows a wireless channel configuration diagram when there is no free communication channel in the wireless communication control system of the present invention, and as shown in the figure, all communication channels are in use. In this case, there is no channel to allocate to communication after receiving a call signal, so call control is unnecessary.

When communication channels 9e - 9e and 10c - 10e are in use, 9b and 10b are set as outgoing control channels, but if additional communication channels are required due to new calls, etc., outgoing control is interrupted. , unnecessary outgoing control channel 9b, and iob are allocated as communication channels to form a channel configuration as shown in the figure.

If the communication channel is full and there is no outgoing control channel, the base station information in the downlink incoming call control channel 10a is used to transmit outgoing call prohibition information, and the wireless terminal station in the incoming call standby mode receives this information. Know that the outgoing control channel does not exist.

Next, for example, the communication ends and the communication channel 9e+10e
If a space becomes available in the communication channels 9e and 10e, new communication channels 9e and 10e are
is set as the outgoing control channel, cancels the outgoing prohibition in the base station information in the downlink incoming call control channel 10a, broadcasts the outgoing control channel, and resumes outgoing/incoming control.

In addition, when a wireless terminal station has mobility and needs to register the location of the wireless zone in which the M-free terminal station is located, it receives base station information and learns that the transmission control channel is in communication, The location registration information is sent by randomly accessing the uplink incoming control channel 9a.

FIG. 4 shows a call control flow for the M-less terminal station in the case where there is no free communication channel available in this method described above and it becomes necessary to use another communication channel.

〔Effect of the invention〕

As explained above, according to the present invention, when there is an empty communication channel, a part or all of the channel is set as a transmission control channel, thereby providing a means for effectively utilizing an unused wireless channel. I will do it.

Therefore, when multiple free communication channels exist, by setting up multiple outgoing control channels, the random access collision rate is reduced and the outgoing connection delay is reduced.

FIG. 5 shows the average outgoing connection delay when the outgoing control channel is randomly accessed.

The access method is the slotted Aloha method, and the retransmission is repeated a9 times until the transmission is successful, and the retransmission interval is 2 seconds. The horizontal axis shows the signal occurrence rate (number of signals/slot interval), and the vertical axis shows the outgoing connection delay in the wireless section. Reference numeral 20 indicates a case where there is one outgoing control channel, 21 shows a case where there are two outgoing control channels, and 22 shows a case where there are three outgoing control channels.

From Figure 5, when the signal occurrence rate is 0.3 (number of signals/slot interval), the transmission control channel is changed from 1 channel to 2 channels.
It can be seen that by increasing the number of channels, the outgoing connection delay in the wireless section can be reduced to about 40%. Call loss is 3% in a wireless zone where the signal volume is 807-ran during the busiest hours.
When the number of communication channels is set, the probability that there will be an empty communication channel during the busiest period is approximately 64%, and this method is widely applicable.

In addition, when assigning wireless channels within a wireless zone to communication channels and control channels, the outgoing control channel is not set fixedly, and if the amount of communication increases, outgoing control is interrupted and all channels other than the incoming control channel are By using a wireless channel as a communication channel, it is possible to reduce call losses due to no available communication channels, compared to the case where the origination control channel is fixedly set.

FIG. 6 shows the traffic volume that can be carried when a wireless channel, which was conventionally assigned as a call control channel, is used as a communication channel according to this method.

The horizontal axis shows the number of communication channels, and the vertical axis shows the traffic that can be carried by each number of channels. 17 is a case where the number of communication channels is determined using the conventional method so that the call loss is 3%, 18 is a case where the number of communication channels is increased by one channel compared to 17 by this method, and 19 is a case where the number of communication channels is increased by 2 channels. Indicates the amount of traffic that can be carried.

From Figure tpJ6, by applying this method to a conventional wireless zone with 3 communication channels and 1 outgoing control channel, the amount of calls that can be carried, that is,
It can be seen that the subscriber capacity increases by approximately 1.8 times.

Furthermore, it is expected that various communication services will be required by digital communication systems in the future, and the number of channels required for wireless communication will differ depending on the type of service.

Therefore, in individual transmission control, which is characterized by performing transmission control and communication on the same channel, it becomes difficult to allocate channels to various communications.

According to this method, which uses common control to control the transmission of multiple wireless terminal stations using one channel as a transmission control method, it is possible for the wireless base station to allocate the required number of communication channels using the control channel. In addition, it is easy to control outgoing calls when there are many communication channels in a wireless zone, and the system can be expanded by increasing the number of wireless zones and wireless channels, so it can be said to be an excellent control method.

It can be said that the present invention has great effects in that it takes advantage of the above-mentioned common control, effectively utilizes wireless channels, and reduces outgoing connection delays.

[Brief explanation of the drawing]

FIG. 11 is a diagram explaining the operation of the wireless communication control system of the present invention, and FIG.
Figure (b) is a wireless channel configuration diagram when there is an empty communication channel, Figure (e) is a wireless channel configuration diagram when there is no idle communication channel and it is necessary to use another communication channel. The figure is a block configuration diagram explaining the operation of a wireless base station, FIG. 3 is a diagram showing call control 70- for a non-#i terminal station when there is an empty communication channel in this method, and FIG. 4 is a diagram showing this method 5 and 6 are diagrams illustrating the wireless terminal station call origination/reception control 70- when there is no vacant communication channel and it is necessary to use another communication channel, and FIGS. 5 and 6 are diagrams for explaining the present invention in detail, Figure t145 is a diagram showing the average outgoing connection delay when the outgoing control channel is randomly accessed, and Figure 6 is a diagram showing the call volume that can be carried when the number of communication channels in the wireless zone is increased compared to the conventional method.
Figure S7 is a configuration diagram of a wireless system consisting of a wireless base station and a plurality of non-#I terminal stations, and Figure 8 is a diagram showing an example of the signal configuration of a downlink incoming control channel from the wireless base station to the wireless terminal station.
FIGS. 9 to ii are diagrams showing call control 70- of a conventional wireless terminal station. FIG. 9 shows communication, call control, and call control in separate channels, In the case where communication channels are used to individually control incoming and outgoing calls from a wireless terminal station, Figure tI411 is a diagram showing a case where incoming calls are commonly controlled using a dedicated channel, and outgoing calls are individually controlled using a communication channel. 1... Wireless base station, 2a-2c...
...No #1 Jll terminal, 3a-3d ・
...Incoming call information, 4a+4b...
... Base station information, 5a to 5e ... Uplink radio channel, 6a to 6e ... Downlink radio channel,
7a-7e...Uplink wireless channel, 8a-8
e... Downlink radio channel, 9a to 9e...
...Uplink wireless channels, 10a to 10e...
- Downlink wireless channels, 11a to lid... transmitting device, 12a12d... receiving device,
13a to 13d...signal processing section,
14... Incoming call processing unit, 15...
Channel management unit, 16...Outgoing processing unit, 17...Call volume that can be carried by conventional method, 18...Communication channel 1
Call volume that can be carried when channels are increased, 19...
・Call 1 that can be carried when the number of communication channels is increased by 2
, 2o ...... Origination (11 Average origination delay time when there is one control channel, 21
...Average transmission delay time when there are two transmission control channels, 22 ...Average transmission delay time when there are three transmission control channels Agent Patent Attorney Honma Sudoori 4 -￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥ne downhill, 2nd figure 3rd figure / figure 2nd figure 2nd figure 3rd figure? Figure t) El (call/5lni) Figure i

Claims (1)

[Claims] A service area is composed of one or more wireless zones, each wireless zone is equipped with a wireless base station, a plurality of wireless terminal stations exist within the wireless zone, and the wireless base station is In a wireless communication system that has multiple wireless channels for controlling and communicating with wireless terminal stations under its control, a wireless base station divides the wireless channel into an incoming control channel and a communication channel, and Among them, part or all of the vacant communication channels that are not used for communication are set as common outgoing control channels that control outgoing calls for multiple wireless terminal stations. The transmission from the wireless base station is performed using the transmission control channel, and when the wireless base station starts communication with the wireless terminal station, it sets a communication channel from among the vacant communication channels including the transmission control channel, A wireless communication control method characterized in that communication is performed using the communication channel.