JP3255841B2 - Wireless base station communication busy control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a busy control method for notifying a mobile terminal of occurrence of busy in a radio base station having a layer structure (hierarchical structure).

[0002]

2. Description of the Related Art FIG. 2 shows a PHS (Personal Handy phone S).
2 shows a conceptual diagram of the system. In the figure, mobile terminals PS1 to PS3 include a plurality of PHS base stations CS1 to CS
3 can receive the control channel of the PHS base station CS1 of the strongest radio wave. On the other hand, the plurality of PHS base stations CS1 to CS3 form the same paging area, and when calling the mobile terminals PS1 to PS3 existing in the same paging area, all the PHS base stations CS1 to CS3 forming the same paging area. Mobile terminal PS on the control channel from CS3
1 to PS3 are simultaneously transmitted. Therefore, in the state of FIG. 2, the mobile terminals PS1 to PS3 receive the incoming signal of the PHS base station CS1 having the strongest radio wave. When a call is transmitted from the mobile terminals PS1 to PS3, a call signal is transmitted on the control channel to the waiting PHS base station CS1.

FIG. 3 is a hierarchical block diagram showing a configuration of a conventional communication busy control system of a PHS base station. The communication processing system including the PHS base station CS and the mobile terminal PS has a hierarchical structure, and a layer 1 (first hierarchical section) mainly includes a path setting section 1-5 for setting a communication path by hardware. Signals are transmitted / received to / from the mobile terminal PS via a terminal (not shown).

[0004] Layer 2 (second layer unit) comprises a wireless management unit 1-4 by software, and performs link control such as protocol processing. Layer 3 (third layer unit) is a PBS management unit 1-2 that manages a message level, and includes a line control unit 1-1, an additional service control unit 1-3, and a wireless management unit 1.
-4 is performed. Normally, the PHS base station CS has a plurality of path setting units 1-5 (two systems in the figure), and a PBS management unit 1
-2. Each layer has a CPU.

[0005] Normally, in a PHS system, layer 2 (second
Protocol processing is performed by the wireless management unit 1-4 of the (hierarchical unit).
Further, when the communication volume (traffic) with the mobile terminal PS becomes large and the mobile terminal PS becomes incapable of processing, a busy signal is generated. Since the slot is allocated to the communication control channel, a busy signal generated in real time is transmitted using this communication control channel,
Busy control is performed by notifying the other party's mobile terminal PS and temporarily stopping the transmission, and processing the delayed communication.

[0006] Wireless management section 1 of layer 2 (second layer section)
In No. 4, a plurality of buffers are provided to store and process the received data. However, the usage status of the buffers is constantly monitored, and a busy signal is sent to the communication partner (mobile terminal PS) when the remaining number of buffers becomes equal to or less than a set value. Then, the transmission of the other party is suspended, the communication data that has been stuck is processed, and when the remaining number of buffers is restored, a busy recovery signal is transmitted to the other party, and the suspension of the transmission is canceled to resume the communication. Communication busy control is performed by the above method.

[0007]

However, the monitoring of the remaining number of buffers described above is performed only in the radio section, that is, only by busy monitoring between the radio management section 1-4, the path setting section 1-5, and the mobile terminal PS. The busy status of the part cannot be monitored. P
In addition to the above, the layer 2
Layer 2 and layer 3 between tasks in the wireless management unit 1-4
Between the CPUs, the PBS management unit 1 of the layer 3 (third hierarchy unit)
-2, communication between the tasks in the PBS management unit 1-2 and the supplementary service control unit 1-3, and the PBS management unit 1-
There is a possibility that a busy state may occur on the communication between the communication network 2 and the line control unit 1-1 and also on the line network side. In the conventional communication busy system in which the busy control is performed only in the wireless section, when the busy of another factor occurs, it is not possible to notify the partner mobile terminal PS, and the entire PHS base station CS may be HALT (stop state). It is possible. If a HALT occurs during communication, not only will communication be cut off, but it will take time until the PHS base station CS is restored again, and communication will not be possible in that service area, causing discomfort to users and causing trouble. was there.

[0008] Further, the mobile terminal PS waiting is a PHS.
There is a problem that the busy state of the base station CS cannot be recognized. In this case, the mobile terminal PS receives the busy signal after establishing the communication channel, and recognizes the busy state of the PHS base station CS. Further, the PHS base station C
If a part of S is busy, there is a possibility that an incoming signal may not be transmitted from this PHS base station to mobile terminal PS, and mobile terminal P waiting for this PHS base station
S monitors the control channel of the other PHS base station even within the same paging area as described above, even though the other PHS base stations in the same paging area are simultaneously transmitting the incoming signal. There is also the problem of not knowing the incoming call because it has not been received.

The present invention has been made in view of the above points, and in order to eliminate the above problems, a radio base station having a hierarchical structure always monitors all busy factors,
By notifying the waiting mobile terminal of the busy state of the wireless base station, the mobile terminal attempts to enable standby of another wireless base station.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a means for detecting a busy in a local station at a radio base station, and changing the access of a message on a control channel when the busy of the local station is detected. Means for switching to a signal, when a busy occurs in a part of the own station, makes the waiting mobile terminal recognize the busy of the radio base station at an early stage, and makes another radio base station wait for the busy. This makes it possible to switch.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a PHS according to the present invention.
FIG. 2 is a hierarchical block diagram illustrating a communication busy control method of a base station. As shown in the figure, the PHS base station 1 according to the present invention includes a path setting unit 1-5 of layer 1 (first layer unit), a layer 2
The radio management unit 1-4 of the (second hierarchy unit), the PBS management unit 1-2 of the layer 3 (third hierarchy unit), the line control unit 1-1, and the supplementary service control unit 1-3 are different from those of the related art. The same is true.

Wireless management section 1 of layer 2 (second layer section)
4 will be described in detail. The wireless management unit 1-4 is a CPU
The communication module (task) 1-4-1 communicates with the upper layer PBS management unit 1-2 under the OS unit 1-4-2 executed by the OS, and the lower layer path setting unit 1-4-1. 5, the communication module (task) 1-4-7, and the protocol module (task) 1-4-3 to the protocol module (task) 1-4-6 are executed.

In the PHS system, four slots are provided in the TDMA communication system, one of which is a common communication control channel slot (different from the control channel received during standby). Thus, transmission and reception can be performed simultaneously with the three mobile terminals 1 to 3. Protocol module 1-4-3 to protocol module 1
Reference numeral 4-6 denotes a task provided for each slot, and each module includes a plurality of reception buffers 1-4-3a and transmission buffers 1-4-3b to reception buffers 1-4-6a-1.
-4-6b, which are used for communication with the mobile terminals 1 to 3, respectively. When the PHS base station 1 communicates with the mobile terminal, each protocol task monitors the remaining number of the reception buffers (the number of unused reception buffers), and when the communication volume increases and the remaining number drops below a specified value, the path setting unit 1 An RNR frame (busy signal frame) is transmitted to the mobile terminal via -5. R
The mobile terminal receiving the NR frame suspends the transmission,
Meanwhile, the protocol module processes the data in the reception buffer. When the number of the receiving buffers is recovered, the RR frame (normal signal frame) is transmitted to the mobile terminal via the path setting unit 1-5, and the communication is resumed. The above points are the same as the conventional one.

The communication busy control method of the present invention is a method of constantly monitoring other busy factors and notifying the mobile terminal. The busy factors and the monitoring method are described below. OS section 1-4-2
Then, the communication module 1-4-1 and the communication module 1-4
-7, communication between the protocol modules 1-4-3 to 1-4-6 and other modules is controlled by mail. The OS unit 1-4-2 monitors the number of remaining mails, and notifies the protocol modules 1-4-3-1 to 1-4-6 when the communication volume increases and the number of remaining mails falls below a specified value. The RNR frame is transmitted to the mobile terminal via -5, and the transmission from the other party is suspended. When the number of remaining mails is recovered, transmission of the RR frame to the mobile terminal is resumed.

When a busy occurs in the PBS management section 1-2 of the layer 3, a common memory (Dua) is used between the layers.
l Port RAM), a busy flag is provided in the common memory, the PBS management unit 1-2 sets the busy flag, the communication module 1-4-1 monitors the busy flag, and the busy flag is set. Then, the protocol module is notified and the path setting unit 1
The RNR frame is transmitted to the mobile terminal via -5, and the transmission from the other party is suspended. When the busy flag is reset, an RR frame is transmitted to the mobile terminal to resume communication.

When the layers communicate with each other in the HDLC procedure, the RN is transmitted from the PBS management unit 1-2 which has been busy.
An R signal (busy signal) is sent to the communication module 1-4-1. The communication module 1-4-1 notifies the protocol module, transmits the RNR frame to the mobile terminal via the path setting unit 1-5, and causes the other party to temporarily stop the transmission.
When the RR signal (normal signal) is sent from the PBS management unit 1-2, the RR frame is transmitted to the mobile terminal to resume the communication.

When a busy occurs on the line network side, the line control unit 1-1 notifies the PBS management unit 1-2, and the transition is processed in the same procedure as described above.

The protocol module 1-4-3 to the protocol module 1-4 of the wireless management unit 1-4 of the layer 2
No. 6 performs the above-described busy monitoring in addition to the conventional busy monitoring. Therefore, when the PHS base station 1 is busy, an RNR frame is immediately transmitted to the mobile terminal and the transmission of the frame by the mobile terminal is temporarily stopped. Further, after the busy state is restored, the RR frame is transmitted to the mobile terminal when the busy state has been recovered to a point where the PHS base station 1 can operate normally (or partially), and the recovery of the busy state is notified.

In addition, the present invention provides a method for, when a layer 2 detects a busy state in a PHS base station 1 for a mobile terminal in a standby state as described above, the layer 2 is transmitted to another PHS base station which can communicate within the same paging area. The layer 2 is provided with a control channel control module (task) 1-4-8 in order to transmit an access change signal for switching the standby. Further, when the communication module 1-4-1 detects the occurrence of the busy, the communication module
The OS unit 1- so that the busy path a for notifying 4-8 can immediately notify the busy state separately from the normal message path.
4-2. Similarly, when the communication module 1-4-1 detects the occurrence of a busy,
A busy route b for immediately notifying the S management unit 1-2 and the line control unit 1-1 is provided separately from a normal message route.

When the communication module 1-4-1 of the layer 2 detects that the PHS base station 1 is busy, the communication module 1-4-1 uses the busy path a to control the control channel control module 1-4-1. -4-8 is notified of the busy state, and the control channel control module 1-4-8 notified of the busy state transmits the message to its own
An access change signal for prohibiting access to the HS base station 1 is independently switched and transmitted. Therefore, among a plurality of PHS base stations forming the same paging area, PH
Since S base station 1 was the base station with the strongest radio wave,
The mobile terminal monitoring the control channel of the S base station 1
By receiving the access change signal from the PHS base station 1, it recognizes that a busy has occurred inside the PHS base station 1. Therefore, the mobile terminal that has received the access change signal searches for a PHS base station in the same paging area, determines a communicable PHS base station other than the PHS base station 1, and thereafter, determines a newly determined PHS base station. Monitor the control channel. Therefore, when there is an incoming call to the mobile terminal whose standby has been changed, in the PHS system, a plurality of PHS base stations in the same paging area transmit the incoming signal all at once.
Since the HS base station transmits an incoming signal without being busy, the mobile terminal whose standby has been changed can surely receive the incoming signal. In addition, since the call is not in a busy state, the wireless link can be quickly established.

When the communication module 1-4-1 of the layer 2 detects that the PHS base station 1 is busy, the communication module 1-4-1 transmits a busy signal using the busy path b. Send immediately. The busy signal is transmitted to the line control unit 1- via the PBS management unit 1-2 which is a layer 3.
1 is stored. Therefore, the line control unit 1-1 notified of the busy state can immediately send a busy signal to the line side irrespective of the state of its own reception buffer, and thus it is expected that the busy state is quickly recovered.

As described above, in the embodiment of the present invention, all the portions where a busy state may be generated are monitored. The station 1 can be prevented from performing HALT. When a busy state occurs even in a part of the entire PHS base station 1, a busy notification (RNR frame) is sent to the mobile terminals 1 to 3 that are communicating, and the subsequent message amount is reduced. Accordingly, a part of the busy state recovery (message processing) can be performed in a concentrated manner, thereby shortening the busy state recovery time.

Also, for a mobile terminal that is waiting,
Since the busy state is notified on the control channel,
The mobile terminal can quickly switch its standby to another PHS base station that is not busy in the same paging area, so that transmission from the mobile terminal and reception from the PHS base station can be performed more reliably and more quickly. Becomes

[0024]

As described above, in the busy state of the PHS base station, the control signal is changed and transmitted so that the layer 2 moves to another PHS base station, and access to the PHS base station is prohibited. As a result, the control channel is managed in Layer 3 in the normal case. However, since Layer 2 controls the busy of the PHS base station, when a busy occurs inside the PHS base station, Layer 3 starts to control the control channel. Without waiting for the message for managing the control channel of the PHS base station, the control signal can be immediately switched to the control signal (access change signal) for prohibiting access to the PHS base station in layer 2 and transmitted.

[0025] Therefore, the mobile terminal can immediately wait from the busy PHS base station whose response has been delayed to another PHS base station that is not busy in the same paging area, so that the transmission from the mobile terminal can be performed. , Incoming calls,
It will be even faster.

[Brief description of the drawings]

FIG. 1 is a hierarchical block diagram illustrating busy control of a PHS base station according to an embodiment of the present invention.

FIG. 2 is a conceptual diagram of a PHS system related to the present invention.

FIG. 3 is a hierarchical block diagram illustrating busy control of a conventional PHS base station.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 PHS base station 1-1 Line control unit 1-2 PBS management unit (Layer 3) 1-3 Additional service control unit 1-4 Radio management unit (Layer 2) 1-5 Path setting unit (Layer 1)

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) H04B ^7/ 24-7/26 109 H04Q ^7/ 00-7/38

Claims (1)

(57) [Claims] A plurality of radio base stations form the same paging area, and a plurality of mobile terminals existing in the area monitor a control channel of one radio base station satisfying a predetermined radio wave condition. A communication busy control method of a radio base station in a radio communication system in which a plurality of radio base stations forming the area transmit an incoming signal on a control channel for a call of one mobile terminal existing in the area. Means for the radio base station to detect busy in the station, and means for switching a message of the control channel to an access change signal when detecting a busy in the station, and transmitting the signal by transmitting the access change signal. The communication busy control method of the radio base station, wherein the mobile terminal having received the radio base station monitors the control channel of another radio base station, Has a hierarchical structure of a communication path setting unit (layer 1) with a mobile terminal, a wireless management unit (layer 2), and a message management unit (layer 3), and the wireless management unit (layer 2) includes itself. Means for detecting busy in the own station for detecting busy in each layer and between layers, and means for switching a message of a control channel to an access change signal when detecting busy in the own station. The communication busy control method of the wireless base station.