JPH10285644A - Radio channel assignment priority determination method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To distinguish the case that a radio propagation state is excellent from the case that a radio wave is barely usable due to the effect of an interference wave by converting an interference wave level into a point and deciding radio channel assignment priority. SOLUTION: A channel assignment control section 111 gives an instruction to a transmitter-receiver control section 113 that a radio channel not in use is employed to measure the interference wave level via a radio base station management section 112. The transmitter-receiver control section 113 measures the interference wave level of all radio channels according to the instruction from the channel assignment control section 111. Then all the measured interference wave levels are sent to the channel assignment control section 111 via the radio base station management section 112. The channel assignment control section 111 receiving all the measured interference wave levels converts each interference wave level into a point to decide the radio channel assignment priority.

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio channel allocation priority determining method based on a score, and more particularly to a radio channel allocation priority determining method based on a score in a radio channel allocation control method for a mobile communication system.

[0001]

2. Description of the Related Art Conventionally, this type of radio channel allocation priority determination method uses an autonomous decentralized dynamic channel allocation in a mobile communication system for the purpose of improving frequency utilization efficiency and reducing the workload of radio channel arrangement design. It is used to realize. An example of a conventional radio channel assignment priority determination method is disclosed in Japanese Patent Application Laid-Open No. 62-910.
No. 33 is described. The radio channel allocation priority determination method described in this publication, after a radio channel allocation request is generated, rather than simply determining the allocation priority based on past radio channel usage history,
A past transmission success rate is stored for each wireless channel, and the transmission success rate is used as an assignment priority.

However, in a method for selecting a radio channel to be allocated after a radio channel allocation request is generated,
You may have to repeat the selection of the tral,
There is a problem that the connection delay is larger than in a system in which channels are fixedly arranged. In order to solve this problem, there is a radio channel allocation method in which the radio base station sets the radio channel that is available and has the highest allocation priority to the standby transceiver, as the radio channel to be waited for. . An example of an assignment priority determination method in this wireless channel assignment method is disclosed in Japanese Patent Laid-Open No. 8-3.
No. 3033. The radio channel assignment priority determination method described in this publication raises the assignment priority when the interference wave is equal to or less than a preset threshold, and assigns the assignment priority when the interference wave exceeds the preset threshold. Priority is decreasing.

[0003]

The problem with the prior art is that the priorities of radio channel assignment are inaccurate. For this reason, depending on the setting of the threshold value for determining whether to increase or decrease the allocation priority due to the interference wave, the available radio channels are barely determined to be unusable from the allocation priority and the number of radio channels to be allocated becomes insufficient, or barely sufficient. If an available wireless channel is determined to be available from the allocation priority and the channel is actually allocated, the call quality may be extremely poor.

[0004] The reason is that how to determine the assignment priority is
This is because it is not distinguished between a case where the radio wave propagation condition is good without interference wave and a case where the usable radio wave propagation condition is slightly better due to the influence of the interference wave.

It is an object of the present invention to provide a radio channel assignment priority determining method according to an interference wave level.

[0006]

SUMMARY OF THE INVENTION In the radio channel assignment priority determining method according to the present invention, the radio channel assignment priority is determined after converting an interference wave level into a score. More specifically, there is provided means (202 in FIG. 2) for converting the interference wave level into a score using a conversion table of interference wave levels and scores ((1) in FIG. 3).

Using the conversion table of the interference wave level and the score, the interference wave level is converted into the score and the radio channel assignment priority is determined. Due to the influence of the waves, it is possible to distinguish the case where the usable radio wave propagation condition is slightly better. Further, it is possible to distinguish between a case where the interference wave cannot be used and a case where the interference wave cannot be measured for some reason.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION

[1] Description of Configuration Next, an embodiment of the present invention will be described in detail with reference to the drawings.

Referring to FIG. 1, a first embodiment of the present invention is a radio base station 102 having a built-in transceiver for wirelessly connecting to a mobile station, and a base station for controlling these radio base stations in a bundle. The station control device 101 is included.

[0010] The radio base station 102 includes a transceiver control unit 113 for controlling the transceiver.

The base station control apparatus 101 includes a radio base station management section 112 for connecting radio base stations and a channel allocation control section 111 for deciding a radio channel to be assigned to a transceiver.
It has.

The channel assignment control unit 111 transmits and receives the signal to the transceiver control unit 11 via the radio base station management unit 112 so as to measure the interference wave level using the unused radio channel.
Instruct 3

[0013] The transceiver control unit 113 measures the interference wave levels of all the radio channels according to the instruction from the channel assignment control unit 111. Then, all measured interference wave levels are transmitted to channel assignment control section 111 via wireless base station management section 112.

The channel assignment control unit 111, having received all the measured interference wave levels, converts each interference wave level into a point and determines a wireless channel assignment priority. [2] Description of Operation Next, the operation of the embodiment of the present invention will be described with reference to FIGS. 1, 2, 3 (1), 4 and 5 (1).

The maintenance person determines each score A, B, C, D in the conversion table of the interference wave level and the score as shown in FIG. For each score, score A is the maximum value, score B is score A or less and score C or more, score C is score B or less and score D
As described above, the score D is set to the minimum value.

The score A is preferably set in a range from +1 to +5. This is because radio wave propagation conditions are good.

The score B is preferably set in a range from -2 to +2. This is because the radio wave propagation condition is rather good.

The score C is preferably set in a range from -5 to -1. This is because the radio wave propagation situation is poor.

The score D is preferably set in the range of -5 to -1. This is because the radio wave propagation state is unknown and may be as high as the case where the radio wave propagation state is poor.

The channel assignment control unit 111 selects an unused radio channel that is not in failure to measure the interference wave level. The selected radio channel for measuring the interference wave level is closed and the interference wave level can be measured. It instructs the wireless base station management unit 112 to transmit a request for measuring an interference wave level using this wireless channel to the transceiver control unit 113. Upon receiving the instruction, the wireless base station management unit 112 transmits this request to the transceiver control unit 113. In response to this request, the transceiver control unit 113 measures interference wave levels for all wireless channels using the designated wireless channel, and creates a table of wireless channels and interference wave levels as shown in FIG. I do. The created radio channel and interference wave level table are stored in the channel assignment control unit 11.
1 to the base station management unit 112.
If necessary, the table of the radio channel and the interference wave level may be divided and created, and divided and a transmission request may be made. Upon receiving the request, the radio base station management unit 112 transmits this radio channel and interference wave level table to the channel assignment control unit 111 (201).

The channel assignment control unit 111 scores the interference wave level of each wireless channel in the received wireless channel and interference wave level table using a conversion table of interference wave levels and scores as shown in (1) of FIG. Convert to Then, a table of wireless channels and scores as shown in (1) of FIG.
02).

It is determined whether or not scores have been assigned to all wireless channels (203). If all wireless channels have been scored, terminate the process,
If not, steps 201, 202 and 203 are repeated.

If it is necessary to assign a wireless channel,
The wireless channel allocation priority is determined based on the wireless channel and score table, and the wireless channel is allocated.

Next, the effect of the first embodiment of the present invention will be described. In the first embodiment of the present invention, since the interference wave level is converted into the score using the conversion table of the interference wave level and the score and the wireless channel assignment priority is determined, the wireless channel assignment priority according to the interference wave level is determined. Degree can be determined. [Example] [1] Description of Configuration of Example The configuration of an example of the first embodiment of the present invention is the same as that of the embodiment of the present invention, and therefore, description thereof will be omitted. [2] Description of Operation of Example Next, the operation of the first example of the first embodiment of the present invention will be described in detail.

The maintenance person determines each score in the conversion table between the interference wave level and the score as shown in FIG. +3 if the radio wave propagation condition is good without interference wave level,
+ If barely usable due to interference wave level
1 is set to -1 if the signal cannot be used due to the influence of the interference wave level or if the interference wave level cannot be measured.

Upon receiving the radio channel and interference wave level table, the channel assignment control section 111 determines the interference wave level of each radio channel in the radio channel and interference wave level table as shown in FIG. Using the conversion table of the wave level and the score, the score is converted into a score, and a table of wireless channels and the score as shown in (2) of FIG. 5 is created. If wireless channel allocation is required, the wireless channel allocation priority is determined based on the wireless channel and score table, and the wireless channel is allocated.

Next, the effect of the first example of the first embodiment of the present invention will be described. The first example of the first embodiment of the present invention uses a scoring conversion table that gives +1 when the radio channel is barely available due to the influence of the interference wave level, thereby increasing traffic. A wireless channel arrangement capable of accommodating is provided.

Next, the operation of the second example of the first embodiment of the present invention will be described in detail.

The maintenance person determines each score in the conversion table of the interference wave level and the score as shown in FIG. +1 if the radio wave propagation condition is good without interference wave level,
If it is barely usable due to the influence of the interference wave level,
1 is set to -5 when it cannot be used due to the influence of the interference wave level or when the interference wave level cannot be measured.

Upon receiving the radio channel and interference wave level table, the channel assignment control section 111 determines the interference wave level of each radio channel in the radio channel and interference wave level table as shown in FIG. Using the conversion table of the wave level and the score, the score is converted into a score, and a table of wireless channels and the score as shown in (3) of FIG. 5 is created. If wireless channel allocation is required, the wireless channel allocation priority is determined based on the wireless channel and score table, and the wireless channel is allocated.

Next, the effect of the second example of the first embodiment of the present invention will be described. The second example of the first embodiment of the present invention uses a score conversion table of -1 when the radio channel is barely usable due to the influence of the interference wave level. Wireless channels can be arranged with emphasis on. [3] Another Embodiment of the Invention In the embodiment of the present invention, the case has been described where the base station controller converts the interference wave level into a point. However, the radio base station converts the interference wave level into a point and converts it. Similar effects can be obtained even when the result is transmitted to the base station controller.

Further, in the embodiment of the present invention, the case where the interference wave level is divided into four levels in the table of the radio channel and the interference wave level has been described, but it does not depend on the number of steps for dividing the interference wave level. When the interference wave level is divided more finely, it is possible to determine the wireless channel assignment priority according to the interference wave level. In addition, when the interference wave level is roughly divided, it is possible to determine the wireless channel assignment priority that does not depend on the interference wave level.

[0033]

The first effect is that the priority of radio channel assignment according to the interference wave level can be determined.

The reason is that the interference wave level is converted into the score using the conversion table of the interference wave level and the score, and the radio channel allocation priority is determined.

The second effect is that, in the case of a system having a channel arrangement emphasizing traffic accommodation, the score set when the usable radio wave propagation condition is slightly better due to the influence of the interference wave is set to plus or minus. Or a channel arrangement system that emphasizes voice quality.

The reason for this is that if the score set when the radio wave propagation conditions that can be used is slightly better due to the influence of the interference wave is made positive, the allocation priority increases and the number of usable radio channels increases. Also, if the radio wave propagation conditions that can be used barely due to the influence of the interference wave are set to minus, the score to be set is minus, the priority of allocation will decrease,
This is because only radio channels with good radio wave propagation conditions can be used.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment according to the present invention.

FIG. 2 is a flowchart showing the operation of the embodiment according to the present invention.

FIG. 3 is a diagram showing a relationship between an interference wave level and a score according to the embodiment of the present invention.

FIG. 4 is a diagram illustrating a relationship between a radio channel and an interference wave level according to an embodiment of the present invention.

FIG. 5 is a diagram illustrating a relationship between a wireless channel and a score according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 101 Base station controller 102 Radio base station 111 Channel allocation control unit 112 Radio base station management unit 113 Transceiver management unit 201-203 Processing procedure of base station control device

Claims (9)

[Claims] 1. A wireless channel assignment priority determining method in a mobile communication system, comprising: B) In an autonomous decentralized dynamic channel allocation method, etc., for the purpose of improving frequency utilization efficiency and reducing the burden of radio channel arrangement design work, use an unused radio channel before allocating a radio channel to reduce the interference wave level. Is measured. B) The measured interference wave level is converted into a point, and the assignment priority of the wireless channel is determined in advance based on the converted point. C) When it becomes necessary to assign a wireless channel, the wireless channel is assigned based on this priority. 2. The apparatus according to claim 1, further comprising means for converting an interference wave level into a score using a conversion table of the interference wave level and the score in order to increase accuracy when determining the radio channel assignment priority. Item 1. A wireless channel assignment priority determining method in the mobile communication system according to Item 1. 3. In the conversion table of the interference wave level and the score, according to the interference wave level measurement result, when the radio wave propagation condition is good, the level is “no effect”, and when the radio wave propagation condition is slightly good, “channel switching is required. And means for setting the level of radio wave propagation to be “unusable” when the radio wave propagation condition is poor, and the level of “measurement impossible (not applicable)” when the radio wave propagation condition is unknown. A radio channel assignment priority determining method in a mobile communication system according to claim 1 or 2. 4. The apparatus according to claim 1, further comprising means for setting each point value in the conversion table of the interference wave level and the score in the range of +1 to +5 when the radio wave propagation condition is good based on the interference wave level measurement result. A wireless channel assignment priority determining method in the mobile communication system according to claim 1 or 2. 5. A means for setting each point value in the conversion table of the interference wave level and the score from a result of the measurement of the interference wave level to a time when the radio wave propagation condition is slightly good in a range from -2 to +2. The wireless channel allocation priority determining method in the mobile communication system according to claim 1 or claim 2. 6. A means for setting each point value in the conversion table of the interference wave level and the score in a range of -5 to -1 when the radio wave propagation condition is bad, based on the interference wave level measurement result. The wireless channel allocation priority determining method in the mobile communication system according to claim 1 or claim 2. 7. The apparatus according to claim 1, further comprising means for setting, in the conversion table of the interference wave level and the score, each score value in the range of -5 to -1 when the radio wave propagation status is unknown based on the interference wave level measurement result. The radio channel assignment priority determining method in the mobile communication system according to claim 1 or 2, wherein: 8. In the conversion table between the interference wave level and the score, in order to configure a channel arrangement system emphasizing traffic accommodation, if the radio wave propagation condition is good, set to +3; if the radio wave propagation condition is rather good, set to +1; 3. A radio channel assignment priority determination in a mobile communication system according to claim 1, further comprising means for setting the value to -1 when the radio wave propagation condition is bad and setting the value to -1 when the radio wave propagation condition is unknown. method. 9. In the conversion table of the interference wave level and the score, in order to configure a channel arrangement system emphasizing voice quality, the value is set to +1 when the radio wave propagation condition is good, and to -1 when the radio wave propagation condition is slightly good. 3. A radio channel assignment priority in a mobile communication system according to claim 1, further comprising means for setting the value to -5 when the radio wave propagation condition is bad and setting the value to -5 when the radio wave propagation condition is unknown. Decision method.