JPH08265832A - Allocation system for communication channel in mobile communication system - Google Patents

Abstract

PURPOSE: To avoid noise or crosstalk or the like in a mobile station with respect to a disturbance wave by allowing a radio relay controller to allocate each communication channel of each transmitter-receiver with priority based on a current interference level for each transmitter-receiver. CONSTITUTION: A relay station 1 has transmitter-receiver sets TRX11-1n which periodically measures an interference level of a communication channel in use and makes a report to a radio relay controller 10 and the radio relay controller conducting allocation preliminary control from a communication channel with a lowest interference level especially when a communication request comes from mobile stations 21-2p. Then the radio relay controller 10 obtains a link head TRX# from a link with a lowest interference level on the occurrence of communication channel allocation to retrieve the presence of an idle communication channel and to retrieve a TRX linked next when no idle communication channel is in existence and to retrieve similarly a channel at a succeeding interference level when no idle communication channel is in existence and to allocate a corresponding communication channel when the idle communication channel is in existence.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication line allocation system in a mobile communication system.

[0002]

2. Description of the Related Art A conventional method of assigning communication circuits in a mobile communication system will be described with reference to the drawings.

FIG. 6 is a block diagram showing a conventional example.

Referring to FIG. 6, this conventional example is disclosed in Japanese Patent Laid-Open No. 4-3.
The disclosure content of Japanese Patent No. 45331 is disclosed, in which the mobile telephone switching center 101 manages all the communication channels in units of each radio base station 111 to 11n, and counts and holds the frequency of interference wave generation in units of each communication channel. When a call channel allocation request is made to an arbitrary wireless base station, a call channel having a low frequency of occurrence of interference waves is preferentially allocated.

[0005]

This conventional communication channel allocation method in a mobile communication system is a communication channel allocation request to an arbitrary radio base station by counting and holding the frequency of interference wave generation for each communication channel unit. In this case, the method is to preferentially allocate the communication channel with a low frequency of interference wave generation, and the interference level of the communication line to be allocated is not considered at all, and only the frequency of interference wave generation is focused on. Therefore, even though there is a communication circuit whose interference level is lower than that of the communication line to be allocated, the frequency of the interference wave is low, but when the communication line is allocated, the communication line with a high interference level becomes a call. There is a risk of using a poor quality communication line for calls because it is used, and noise, interference, and system malfunction due to interference are likely to occur. Cormorants there was a serious problem.

[0006]

According to the communication line allocation method in the mobile communication system of the present invention, a plurality of mobile stations exist in one radio zone, and the communication lines are allocated in response to a communication request from the mobile station. In a multi-channel access type mobile communication system, a plurality of transmitting / receiving devices having a function of measuring and reporting interference levels of respective communication lines, and interference in units of the transmitting / receiving devices according to interference level reports by the respective transmitting / receiving devices A wireless relay control device having a function of managing the communication line for each level and assigning the communication line having the lowest interference level at the time of assigning the communication line to the communication request from the mobile station. It has and.

The communication line allocation system in the mobile communication system of the present invention is a multi-channel access system in which a plurality of mobile stations are present in one radio zone and a communication line is allocated to a communication request from the mobile station. In a mobile communication system, a plurality of transmitting / receiving devices each using a plurality of communication lines, and a wireless relay control device connected to the plurality of transmitting / receiving devices are provided, and the wireless relay control device is provided from each of the plurality of transmitting / receiving devices. An interference level management table that receives the interference level of the communication line and sequentially stores the interference level corresponding to each of the plurality of transmitter / receivers from a first interference level of a minimum level set in advance; A communication line management table that stores the usage status of the communication line corresponding to each of the devices; First setting means for setting the search level for searching the allocated communication line to the first interference level, in order to allocate the communication line to the communication request from the station; and the set search level. Second setting means for obtaining the first transmitter / receiver belonging to the first search transmitter / receiver from the interference level management table, and unused the first search transmitter / receiver from the communication line management table First search means for searching whether or not the communication line exists, and if there is an unused communication line in the first search means, a line allocation means for allocating the unused communication line, and the first If there is no unused communication line in the search means of the above, the second search transmitting / receiving device linked next to the first search transmitting / receiving device from the communication line management table is the transmission / reception of the final link. A first determining means for determining that the device is not a device; and a second determining and transmitting device from the communication line management table when the first determining device determines that the second search transmitting / receiving device is not the transmitting / receiving device of the final link. If there is an unused second communication line in the first search means for the search transmitting / receiving device, the line allocating means allocates the second communication line, and the first determining means determines the second communication line. Third setting means for setting a second interference level higher than the first interference level by a predetermined one step level when it is determined that the search transmitter / receiver is the transmitter / receiver of the final link; The second setting means, the first searching means, based on the setting of the third setting means,
A decision to execute the line allocating means and determine whether or not the communication circuit can be allocated when the setting of the predetermined maximum level value at the third interference level is completed by the third setting means. And means.

[0008]

Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a mobile communication system to which an embodiment of the present invention is applied.

In FIG. 1, the mobile communication system of this application example comprises a relay station 1 and a plurality of mobile stations 21 to 2p connected to the relay station 1 by a plurality of wireless communication lines. A transmission / reception device (TR) that periodically measures the interference level of the communication line in use and reports it to the wireless relay control device 10
X) 11 to 1n and a plurality of communication lines are managed for each interference level in units of the transmitters / receivers 11 to 1n based on the reports received from the transmitters / receivers (TRX) 11 to 1n, and communication requests are sent from the mobile stations 21 to 2p. In particular, the wireless relay control device 10 performs allocation preliminary control from the communication line having the lowest interference level.

FIG. 2 is a diagram showing an example of a communication line management table for the wireless relay control device in this application example to manage the use status of the communication line in transmission / reception device units, and FIG. 3 is in interference level unit in this application example. It is a figure which shows an example of the interference level management table which the wireless relay control apparatus for the purpose of managing the link head transmission / reception apparatus number of the transmission / reception apparatus which belongs to each interference level.

In FIG. 2, this communication line management table shows the usage status of the communication lines 31 to 3m assigned to the respective transmission / reception devices (TRX) 11 to 1n and the communication lines 31 to 31m.
Shows a table used for the purpose of managing the transmitter / receiver number to which ~ 3m belongs, and indicates the number (n) of transmitter / receivers (TRX)
There are minutes. Further, since this communication line management table manages the chain link for each interference level, the transmission / reception device number (previous TRX #), the transmission / reception device number connected before the self transmission / reception device on the chain link (previous TRX #), the chain It has, as information, a transmission / reception device number (later TRX #) connected after the own transmission / reception device on the link. When the own transmitting / receiving device is at the head of the chain link, the front TRX # is none, and when it is at the end of the chain link, the rear TRX # is none.

In FIG. 3, this interference level management table is a table used for the purpose of managing the head transmitter / receiver number of the communication line management table belonging to each interference level. It has a number (start TRX #) as information. However, if there is no transmitter / receiver belonging to the relevant level, there is no top transmitter / receiver number.

FIG. 4 shows an example of a link between the communication line management table shown in FIG. 2 and the interference level management table shown in FIG. 3 in this application example, and FIG. 4A shows a link image in the initial operation. , (B) are diagrams showing a link image after the interference level is measured.

In FIG. 4, this link image diagram is
How is linked to the communication line management table in Fig. 2,
The interference levels 1 to 3 and the transmission / reception device (TR) are used to determine how links are changed by changing the interference level.
X) 11 to 14 will be described. The smaller the interference level, the smaller the interference level.

In FIG. 4A, since the interference level is not fixed during the initial operation of the system, the entire communication line management table is linked to level 1 of the interference level management table.

In FIG. 4B, a transmitter / receiver (TR
X) 11 to 1n, the radio relay controller 10 reconnects the (TRX) communication line management table of the transmission / reception device to the reported interference level of the interference level management table. As an example, if TRX11 reports level 2, TRX12 reports level 3, TRX13 reports level 1 and TRX14 reports level 2, the link image becomes as shown in FIG. 4B. That is, when the wireless relay control device 10 receives such a report, the communication lines are reordered in order of increasing interference level on a transmission / reception device (TRX) basis.

FIG. 5 is a flow chart showing a procedure for searching an available communication line when a communication line is allocated by the wireless relay control device in this application example.

Next, the operation of communication line allocation of the wireless relay control device in this application example will be described with reference to FIGS.

When allocating a communication line, the radio relay control apparatus 10 first sets the search level to the interference level 1 having the lowest interference level (S100). The leading TRX # of the link of the TRX belonging to the search level is obtained from the interference level management table of FIG. 3 and set in the search TRX # (S1
01). Communication line management table of search TRX # (Fig. 2)
Then, an unused communication line is searched from the communication lines 31 to 3m (S102). When there is an unused communication line, the corresponding communication line is assigned (in use), and the process ends (S103).

When there is no available communication line in the communication line management table of the searched TRX #, whether the TRX # is the final TRX # after being linked to the search level of the searched TRX # from the communication line management table (FIG. 2). Judge (S10
4). After TRX # communication line management table TRX
When # is not the search TRX #, the search TRX # is not the final link, so the search TRX # is set as the subsequent TRX # (S10
5) Similarly, search TRX # is used as search TRX #
An unused communication line is searched and assigned from the communication line management table of X # (FIG. 2) (S102, S10).
3). After TRX # communication line management table TRX
When # is the search TRX #, since the search TRX # is the last link, it means that the search for the unused communication line of the TRX belonging to the search level for the first interference level 1 is completed.
Therefore, it is determined whether the search level is the final interference level in the interference level management table (S106), and when it is not the final level,
In order to search for the next interference level, the search level is set to the next interference level in the interference level management table (S107),
Similar to the above, unused communication lines are searched and assigned from the communication line management table of the TRX belonging to the search level from the interference level management table (S101, S10).
2, S104, S105).

In the TRXs belonging to all the interference levels in the interference level management table, when the search for an idle communication line is completed (S106), since there is no communication line that can be allocated, the communication line cannot be allocated, and the process ends. (S
108).

As described above, in this embodiment, when the wireless relay control device 10 allocates a communication line, the TRX # at the head of the link is obtained from the link having the lowest interference level, and the presence or absence of an idle communication line is searched. When there is no available communication line, the TRX # linked next is similarly searched. When there is no free communication line at the corresponding interference level, the next interference level is similarly searched, and when there is a free communication line, the corresponding communication line is assigned.

[0024]

As described above, according to the present invention, the wireless relay control device assigns each communication line of each transmission / reception device in the priority order based on the current interference level of each transmission / reception device. Since the communication lines are used in order from the communication line with the lowest interference level, there is an effect that problems such as noise and interference in the mobile station regarding the interfering wave can be reduced as much as possible.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a mobile communication system to which an embodiment of the present invention is applied.

FIG. 2 is a diagram showing an example of a communication line management table for the wireless relay control device according to the present application example to manage the use status of the communication line for each transmission / reception device.

FIG. 3 is a diagram showing an example of an interference level management table included in a wireless relay control device for the purpose of managing a link head transceiver device number of a transceiver device belonging to each interference level in interference level units in this application example.

FIG. 4 shows an example of a link between the communication line management table shown in FIG. 2 and the interference level management table shown in FIG. 3 in this application example, and FIG. 4A is a diagram showing a link image in the case of initial operation. , (B) are diagrams showing a link image after the interference level is measured.

FIG. 5 is a flowchart showing a free communication line search procedure at the time of assigning a communication line of the wireless relay control device in the present application example.

FIG. 6 is a block diagram showing a configuration of a mobile communication system to which a conventional example is applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 relay station 2 mobile station 10 wireless relay control apparatus 11 to 1n transceiver apparatus (TRX) 21 to 2P mobile station 31 to 3m communication line

Claims (2)

[Claims] 1. In a multi-channel access type mobile communication system in which a plurality of mobile stations are present in one radio zone and communication lines are allocated to a communication request from the mobile station, the interference level of each communication line is set. A plurality of transmission / reception devices having a function of measuring and reporting, managing the communication line for each interference level in the transmission / reception device unit according to the interference level report by each of the plurality of transmission / reception devices, and receiving a communication request from the mobile station. A wireless relay controller having a function of allocating a communication line having the lowest interference level at the time of allocating the communication line, to a communication line allocation method in a mobile communication system. 2. A multi-channel access type mobile communication system in which a plurality of mobile stations are present in one radio zone and communication lines are allocated to communication requests from the mobile stations, each of which uses a plurality of communication lines. A plurality of transmitting / receiving devices and a wireless relay control device connected to the plurality of transmitting / receiving devices, wherein the wireless relay control device receives the interference levels of the respective communication lines from the plurality of transmitting / receiving devices, An interference level management table in which the interference levels are stored in order from the first minimum interference level set in advance corresponding to each of the transmitting and receiving devices, and the usage status of the communication line corresponding to each of the plurality of transmitting and receiving devices. And a communication line management table storing therein, for assigning the communication line to a communication request from the mobile station. First setting means for setting a search level for searching the assigned communication line to the first interference level, and first transmission / reception devices belonging to the set search level from the interference level management table. Second setting means for obtaining and setting the first search transmission / reception device, and first search means for searching the communication line management table for an unused communication line of the first search transmission / reception device. And, if there is an unused communication line in the first search means, a line allocation means for allocating the unused communication line; and if there is no unused communication line in the first search means, the communication First determining means for determining from the line management table that the second search transmitter / receiver linked next to the first search transmitter / receiver is not the transmitter / receiver of the final link; When the disconnection means determines that the second search transmitter / receiver is not the transmitter / receiver of the last link, the communication line management table indicates that the second search transmitter / receiver is not used by the first search means. When there is a second communication line, the line allocating means allocates the second communication line, and when the first determining means determines that the second search transmitting / receiving device is the transmitting / receiving device of the final link, The first
Third setting means for setting a second interference level higher than the predetermined one-step level than the interference level, and the second setting means based on the setting of the third setting means,
When the first searching means and the line allocating means are executed and the setting of the highest level value predetermined by the third setting means at the third interference level is completed, the communication circuit A method of allocating communication lines in a mobile communication system, comprising: a determining unit that determines whether allocation is impossible.