JP3617470B2 - WLL system and its paging channel monitoring cycle setting method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wireless communication system such as a WLL (Wireless Local Loop system or a mobile communication system) using, for example, CDMA (Code Division Multiple Access) technology, and more particularly, to save power consumption of a mobile station such as a subscriber terminal device. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication system for extending battery duration and an improvement of a paging channel monitoring period setting method for the wireless communication system.
[0002]
[Prior art]
Conventionally, in CDMA communication, for example, a method of reducing the paging channel monitoring period as much as possible is generally used as a method for reducing power consumption of a mobile station using a battery as a power source. Note that the subscriber terminal device in the WLL system normally operates as a commercial power source, but can be driven by a battery power source in preparation for a power failure.
[0003]
As a method of reducing the monitoring period of the paging channel, there is a method of making the active state only in the slot allocated from the base station, as described in Japanese Patent Laid-Open No. 7-505030 (Japanese Patent Application No. 5-515898). That is, in general, in digital mobile communication such as TDMA communication method and CDMA communication method, in order to reduce power consumption in a standby state where a user of a mobile station does not perform communication and waits for a call from a base station, Intermittent reception is performed.
[0004]
The base station time-divides the channel for the paging message into a plurality of time slots, and sends out a paging message for a specific mobile station for each time slot. Each time slot is specified using an ID such as a telephone number as a key. Correspondingly, on the mobile station side, only the time slot assigned to the own device is monitored, and the time other than the assigned time slot is set to a low power consumption mode for the unnecessary circuit unit of the own device. Power consumption is greatly reduced.
[0005]
For example, in the specification example of the CDMA system (TIA / EIA / IS-95), during the intermittent reception operation during standby, it is divided into time slots of 163.84 seconds of paging 2048 transmitted from the base station, and slots 0 to 2047 A number (SLOT_NUM) is assigned. Also, information (SLOT_CYCLE_INDEX) designating the intermittent reception cycle is transmitted from the base station to the mobile station.
[0006]
Each mobile station is assigned a paging slot number (PGSLOT number) from 0 to 2047, and (SLOT_NUM-own station's PGSLOT number) mod (16 × 2 SLOT CYCLE INDEX) = 0, depending on its own PGSLOT number. It is set to receive a page message addressed to the own station that exists only in a time slot that satisfies the following condition. If SLOT_CYCLE_INDEX = 0, the intermittent reception operation of the mobile station occurs every 1.28 seconds every 16 slots.
[0007]
Further, as a method for further reducing the monitoring period of the paging channel, as described in Japanese Patent Application Laid-Open No. 11-127110 (Japanese Patent Application No. 10-210622), the remaining battery of the subscriber terminal device is monitored, and the amount of remaining battery is determined. A method of changing the slot cycle index value for specifying the paging cycle is also known. In addition to this, a technique for performing standby reception at a reception timing obtained by thinning out a reception slot allocated with a base station is also disclosed in Japanese Patent Laid-Open Nos. 10-209943 and 2000-32556. ing.
[0008]
By using the known method as described above, it is possible to effectively lengthen the monitoring period of the paging channel and reduce the monitoring time, which is effective in reducing power consumption. In other words, Japanese Patent Application Laid-Open No. 9-261167 and Japanese Patent Application Laid-Open No. 2000-278165 disclose techniques for reducing power consumption during standby of a mobile station regardless of time slot thinning.
[0009]
Incidentally, in the power saving method for reducing the reception time slot as described above, the following problems can be considered. The first problem is that the subscriber terminal device generally selects a shorter cycle value than the value of the max slot cycle index transmitted from the base station and the slot cycle index value of the subscriber terminal device. Therefore, the slot cycle index value can be changed, for example, depending on the remaining amount of the battery, because the change is limited to the maximum slot cycle index value from the base station. That is, it is the base station that controls the paging channel monitoring period, and the subscriber terminal cannot control outside the range.
[0010]
In addition, when a subscriber terminal device that is normally operated with a commercial power source is operated with a battery power source due to a power failure, such as a subscriber terminal device of the WLL system, the slot cycle index value is determined by the remaining battery power. Instead of deciding, the duration needs to be increased correspondingly before the battery power becomes low. In such a case, there is a problem that the technology mentioned above cannot be used because it is desired to save the battery power by immediately changing the battery power operation regardless of the remaining power consumption.
[0011]
In the WLL system, while using a radio technology such as CDMA between a base station and a subscriber terminal device, it is required to construct a system that does not replace the fixed telephone network from the viewpoint of the end user. Therefore, although it does not cause a problem when operating with a normal commercial power supply, if the commercial power is cut off due to a power failure or the like and the battery power supply is operating and the duration is short, a fatal service degradation is caused.
[0012]
[Problems to be solved by the invention]
The present invention has been made to cope with the above problems, and a radio communication system and a paging channel monitoring period setting method (slot cycle index value setting method) that can further reduce the power consumption of a mobile station in a radio communication system. ) Is a new proposal. Another object of the present invention is to provide a technique for appropriately saving power and extending the operation time when a subscriber station terminal device shifts to battery operation due to a commercial power supply interruption due to a power failure or the like in the WLL system.
[0015]
[Means for Solving the Problems]
In order to solve the problem, in the present invention described in claim 1, in the WLL system that transmits a page message from a base station to a subscriber terminal device using a paging channel, the subscriber terminal device is normally used as a power source. A commercial power input unit; a battery used as a power source when the commercial power input unit is powered off; and a paging channel monitoring cycle control unit that sets a paging channel monitoring cycle based on a paging channel monitoring cycle value received from the base station; Determining whether the current operation mode is a commercial power mode that operates using the commercial power input unit as a power source or a battery operation mode that operates using the battery as a power source; and determination by the power source monitoring unit Based on the result, a registration type message for notifying the base station side. Registration type to generate an over-dimessageGenerating means;Means for transmitting the registration type message to the base station;And the base station determines whether the operation mode of the subscriber terminal apparatus is a commercial power supply operation mode or a battery operation mode based on the registration type message received from the subscriber terminal apparatus. When the operation mode of the monitoring means and the subscriber terminal device is the battery operation mode, the paging channel monitoring cycle value is set longer than the normal cycle value, and when the operation mode is the commercial power supply operation mode, the normal cycle value is set. A paging channel monitoring cycle value generation means to be set;Means for transmitting the paging channel monitoring period value set by the paging channel monitoring period value generating means to the subscriber terminal device;It is set as the structure which has.
[0018]
According to a second aspect of the present invention, in the paging channel monitoring period setting method in the WLL system for transmitting a page message from a base station to a subscriber terminal device using a paging channel, the subscriber terminal device is normally supplied with power as a power source. A commercial power input unit to be used and a battery to be used as a power source when the commercial power source input unit is powered off are provided, and the subscriber terminal device operates with the commercial power input unit as a power source in a current operation mode. It is determined whether it is a commercial power supply mode or a battery operation mode that operates using the battery as a power source, a registration type message is generated based on the determination result of the operation mode, and the registration type message is sent to the base station Transmitting, the base station received from the subscriber terminal device Based on the description type message, it is determined whether the operation mode of the subscriber terminal device is a commercial power supply operation mode or a battery operation mode. If the operation mode of the subscriber terminal device is a battery operation mode, paging channel monitoring is performed. A period value is set longer than a normal period value, and when the operation mode of the subscriber terminal device is a commercial power supply operation mode, the paging channel monitoring period value is set to the normal period value, and the set paging channel monitoring A periodic value is transmitted to the subscriber terminal apparatus, and the subscriber terminal apparatus sets a paging channel monitoring period based on a paging channel monitoring period value received from the base station.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will now be described in detail with reference to the accompanying drawings in order to clarify the objects, features and advantages of the present invention. In the embodiment, as an example of a wireless communication system according to the present invention, a WLL system using a CDMA system is taken as an example. The case of performing will be described in detail.
[0020]
First, the entire WLL system will be briefly described. FIG. 1 is a block diagram showing a configuration diagram of the WLL system of the present embodiment. The illustrated system includes a telephone (TEL) 201 on the subscriber station side and a subscriber terminal device 202, a base station 203, a subscriber terminal device controller 204, an exchange 205, and a fixed TEL (telephone) 206 connected to the exchange 205. It is configured. Actually, a plurality of base stations 203, subscriber stations, and fixed TELs 206 are connected, but are not shown in FIG.
[0021]
Next, the base station and subscriber terminal device of this embodiment will be described. FIG. 2 is a block diagram showing components of the subscriber terminal apparatus and the base station related to the additional function for realizing the present invention. In FIG. 2, only the portion deeply related to the present invention is clearly shown.
[0022]
The subscriber terminal device (202; CDMA transceiver) is not shown in FIG. 2, but includes a known transmitting / receiving antenna, an antenna sharing circuit, and a local circuit as a receiving circuit for extracting received data, in addition to the illustrated components. A transmission circuit, a demodulation circuit, a despreading code generation circuit, a despreading circuit, a separation circuit, a codec circuit, etc., and a speed conversion circuit, a spreading code generation circuit, a spreading circuit, a modulation circuit as a transmission circuit for transmission data transmission, It includes a transmission amplifier and the like. These components may be equivalent to those disclosed in, for example, Japanese Patent No. 2914444 (“CDMA transceiver”) and others.
[0023]
Further, the base station 203 serves as a base station transmission unit that transmits transmission data from the subscriber terminal apparatus control device 204 to the subscriber terminal apparatus 202, and includes a known frame assembly circuit, spreading code generation circuit, multiplier, An addition circuit, a band limiting filter, a D / A conversion circuit, a carrier wave transmission circuit, a mixer, a synthesis circuit, a power amplification circuit, a reception unit, a transmission / reception antenna, and the like are also included. These components may be the same as those disclosed in, for example, JP-A-9-261167 and others.
[0024]
First, the additional function configuration unit on the subscriber terminal device 202 side shown in FIG. 2 includes a commercial power input unit 301, a battery 302, a power supply monitoring unit 303, a registration type generation unit 304, a max slot cycle index value monitoring unit 305, This is a paging channel monitoring cycle monitoring control unit 306.
[0025]
The power supply monitoring unit 303 continuously monitors whether the subscriber terminal device 202 is currently operating on a commercial power source or operating on the battery 302 at regular intervals or at regular intervals.
[0026]
The registration type generation unit 304 as an operation mode notification unit sets a registration type corresponding to the power supply mode state of the subscriber terminal device 202 itself. In addition, the registration type generation unit 304 sends a power saving operation setting notification indicating that the power saving mode is entered at least when the power saving mode is entered, and at least when the power saving mode is released. Notify the release notification to the base station side. The set registration type is notified to the base station via a transmission circuit (not shown) as an access channel registration type message. Thus, the subscriber station side is provided with operation mode notification means for notifying the base station side of this when shifting to the power saving operation.
[0027]
The max slot cycle index value monitoring unit 305 monitors the max slot cycle index value from the base station 203 and notifies the paging channel monitoring cycle control unit 306 of the obtained value. The paging channel monitoring cycle control unit 306 executes paging channel monitoring cycle control (sets a cycle) based on the slot cycle index value notified from the max slot cycle index value setting unit 305.
[0028]
On the other hand, the additional function components in the base station 203 shown in FIG. 2 are a registration type monitoring unit 311 and a max slot cycle index generation unit 312. The registration type monitoring unit 311 and the max slot cycle index generation unit 312 change the setting of the specified max slot cycle index value so that the cycle becomes longer in response to reception of the power saving operation setting notification from the subscriber terminal device. And a max slot cycle index value setting means for returning the max slot cycle index value to the prescribed max slot cycle index value in response to the reception of the power saving operation release notification.
[0029]
The registration type monitoring unit 311 monitors the registration type from the subscriber terminal device 202 notified by the access channel, and the current subscriber station (the subscriber terminal device 202 and the telephone (TEL) 201) is commercial. It is determined whether the power supply 301 is operating or the battery power supply 302 is operating.
[0030]
Based on the notification from the registration type monitoring unit 311, the max slot cycle index generation unit 312, if the subscriber station 202 is operating on the commercial power supply 301, the slot cycle index value n (for the slot cycle index n, If the subscriber station 203 is operating on battery power, the slot cycle index value n is set to n = 2, for example. 5. Set the cycle to 12 seconds, and notify the subscriber station 202 using the paging channel.
[0031]
Subsequently, the operation of the present embodiment will be described. FIG. 3 is a sequence of the interface between the subscriber terminal device and the base station, showing an example of the setting process of the slot cycle index value in the embodiment system.
[0032]
The operating base station 203 is a system parameter message indicating that in the steady state (commercial power operation mode), the max slot cycle index value n transmitted using the paging channel is n = 0, that is, 1.28 s period. Is sent to the joining terminal device (S101). When sending the system parameter message, the sequence number of the system parameter message is updated, and the subscriber terminal device is notified that a new parameter will be retransmitted.
[0033]
The paging channel here is a channel that transmits a system parameter message and a channel assignment message before the traffic channel is assigned.
[0034]
The slot cycle index value n designates the timing of transmission from the base station 203 in the slotted mode. As shown in the correspondence table of FIG. 28s, 2.56s if n = 1, 5.12s if n = 2, 10.24s if n = 3, 20.48s if n = 4, 40. if n = 5. If 96 s and n = 6, 81.92 s is set, and if n = 7, 163.84 s is set.
[0035]
The subscriber terminal device 202 needs to perform monitoring in accordance with the timing transmitted from the base station 203. When the subscriber terminal device 202 has a cycle that is faster than the transmission cycle from the base station 203, unnecessary time is monitored, and power is wasted. On the contrary, when the subscriber terminal device 202 side has a period slower than the transmission period from the base station 203, a call loss or the like occurs.
[0036]
As long as it is operating in a steady state, that is, with a commercial power supply, the subscriber terminal device side operates with, for example, n = 0, that is, with a period of 1.28 s. However, a power failure or the like occurs here, and the commercial power supply cannot be used. Suppose that it is in a state. In the WLL system, the subscriber terminal device automatically shifts to the battery operation mode when the commercial power supply cannot be used.
[0037]
In the WLL system, while using a radio technology such as CDMA between a base station and a subscriber terminal device, it is required to construct a system that does not replace the fixed telephone network from the viewpoint of the end user. Therefore, if the duration is short when operating on a battery power source, a fatal service degradation is caused. Therefore, in order to save battery consumption during the waiting time, it is desirable to increase the slot cycle value and lengthen the paging channel monitoring period.
[0038]
Therefore, the subscriber terminal device 202 according to the embodiment notifies the base station 203 that the device is in the battery operation mode using a registration message on the access channel (S102). In this case, the registration message is sent when waiting, when the state changes to the battery operation mode or the commercial power source.
[0039]
As the type content of the registration message, for example, as shown in the explanatory diagram of FIG. 5, the commercial power supply operation mode 401 and the battery operation mode 402 are registered as shown in FIG. It is assumed that the assignments are 1000 and 1001, respectively.
[0040]
On the base station 203 side that has received the registration message including the battery operation mode notification, the maximum slot cycle index value is set to a larger value from the current value (value at normal time; n = 0), for example, n = It is changed to 2 (that is, corresponding to a cycle of 5.12 s) and sent to the subscriber terminal device 202 (S103).
[0041]
In this case, if the value of n is too large, the incoming call to the subscriber station will be delayed or the call will be lost. Therefore, a waiting timer in the subscriber control device 204 or the exchange 205, and further the system Set the value to take into account the overall incoming call time.
[0042]
The subscriber terminal 202 receives the new max slot cycle index value information using the paging channel, changes its own cycle index value to the max slot cycle index value, and supports the subsequent paging channels. Monitor at intervals. In the embodiment, the operation is performed with n = 2 (5.12 s period).
[0043]
If the inconvenience of the commercial power source is resolved, the subscriber terminal device 202 detects this, restores the commercial power source operation mode, and uses a registration message on the access channel to indicate that it has switched to the commercial power source operation mode. To the base station 203 (S104).
[0044]
In response to this notification, the base station 203 side changes (returns) the max slot cycle index value to a normal value of n = 0, that is, a cycle of 1.28 s, and sends it to the subscriber terminal device 202 (S105). ), Again, with a slot cycle of 1.28 s. In response to this, the subscriber terminal device 202 changes its own cycle index value to a max slot cycle index value, and operates at a period of n = 0, that is, 1.28 s.
[0045]
In this way, in the WLL system of the embodiment, when the subscriber terminal device is in the battery operation mode, the operation is performed by extending the slot cycle period, and power consumption in the subscriber terminal device is suppressed.
[0046]
In the above description, the present invention has been described by taking the WLL system as an example. However, the present invention is not limited to the WLL system, but in the case of a general wireless system of a mobile terminal device (mobile station) instead of a subscriber station in the embodiment. It can also be applied to.
[0047]
In other words, when it is desired to reduce the power consumption of the mobile station and extend the battery power, it is possible to notify the base station 203 side of a message indicating that power is to be saved by the setting operation on the mobile terminal side as in the case of the above-described embodiment. By configuring the base station to perform processing according to this message, the slot cycle index value of the mobile station is changed in the same way as in the embodiment, so that the slot cycle is set to a longer period than before. Thus, the power saving effect can be enhanced and the battery operation time can be further extended.
[0048]
The paging channel monitoring period setting method (slot cycle index value setting method) according to the present invention is a mobile station (subscriber terminal device) in a wireless communication system (including a WLL system), as is apparent from the description of the above embodiments. However, at least when a transition is made to the power saving mode, a power saving operation setting notification indicating that the power saving mode is to be entered, and at least when a power saving mode is released, a power saving operation release notification is sent to the base station side. The base station changes the specified max slot cycle index value so that the period becomes longer in response to the reception of the power saving operation setting notification, and the max slot cycle in response to the reception of the power saving operation release notification. The index value is returned to the specified max slot cycle index value, and the mobile station transmits the maximum value transmitted from the base station. Characterized in that to set the paging channel monitoring period on the basis of the hex slot cycle index value, thereby to reduce the power consumption of the mobile station (subscriber terminals) attained an extension of battery life.
[0049]
In particular, in the paging channel monitoring period setting method in the WLL system according to the present invention, the subscriber terminal device sets the paging channel monitoring period based on the max slot cycle index value transmitted from the base station by the paging channel monitoring period setting unit. In addition, the power supply monitoring unit determines whether the current operation mode of the device is the commercial power supply mode or the battery operation mode, and the determination result of the power supply monitoring unit is sent to the registration type message of the access channel by the registration type generation unit. To the base station using the registration type monitoring unit, and whether the subscriber terminal device is in the commercial power supply operation mode based on the received registration type message from the subscriber terminal device. Determine whether the battery is operating Then, when the operation mode of the subscriber terminal device is the battery operation mode, the maximum slot cycle index generation unit changes the setting of the specified max slot cycle index value so that the period becomes longer, and the operation of the subscriber terminal device When the mode is the commercial power supply operation mode, the maximum slot cycle index value is returned to the specified maximum slot cycle index value, thereby reducing the power consumption of the WLL system subscriber terminal device. It can be reduced to extend battery operating time.
[0050]
It should be noted that the system and method of the present invention are not limited to the above-described embodiments, but can be applied to a wide range of systems by appropriately changing each part within the scope of the technical idea of the present invention. .
[0051]
【The invention's effect】
As described above, according to the present invention, in a radio system, when a mobile station shifts to a power saving mode, if abbreviated, a notification to that effect is sent to the registration of an access channel. The base station uses the communication type message to change the specified max slot cycle index value to be longer or return it to the specified value in response to this notification. There is an effect that a wireless communication system that can further reduce consumption can be obtained.
[0052]
Also, in the WLL system, whether the power at the subscriber station terminal device is a commercial power source or a battery power source is monitored, the status is notified to the base station side, and the Max Slot Cycle Index value is changed. When the subscriber station terminal device shifts to battery operation, the power consumption of the subscriber station terminal device can be reduced to improve the performance during a power outage and contribute to improving the service of the WLL system.
[Brief description of the drawings]
FIG. 1 is a configuration diagram illustrating a WLL system that is an embodiment of the present invention.
FIG. 2 is a block diagram clearly illustrating additional functional components in a subscriber terminal device and a subscriber station according to the present invention.
FIG. 3 is a sequence of an interface between a subscriber terminal device and a base station, showing a process of setting a slot cycle index in the embodiment.
FIG. 4 is a correspondence table between slot cycle index values and transmission slot timings in the embodiment system;
FIG. 5 is an explanatory diagram showing an example of a registration type in a registration message.
[Explanation of symbols]
201 ... TEL
202 ... Subscriber terminal device (mobile station)
203 ... Base station
204: Subscriber terminal device control device
205 ... switch
206 ... TEL
301 ... Commercial power input unit
302 ... Battery
303 ... Power supply monitoring unit
304: Registration type generator
305 ... Max slot cycle index value monitoring unit
306 ... Paging channel monitoring cycle monitoring control unit
311 ... Registration type monitoring unit
312 ... Max slot cycle index generator
(401) Commercial power mode
(402) ... Battery mode
(S101) ... System parameter message (from base station to subscriber terminal); notification processing of max slot cycle index = 0
(S102) ... Registration message (from subscriber terminal device to base station); Registration type = battery operation mode notification process
(S103) ... System parameter message (from base station to subscriber terminal device); notification processing of max slot cycle index = 2
(S104) ... Registration message (from subscriber terminal device to base station); Registration type = commercial power supply operation mode notification processing
(S105)... System parameter message (from base station to subscriber terminal); notification processing of max slot cycle index = 0

Claims (2)

In a WLL system that transmits a page message from a base station to a subscriber terminal using a paging channel,
The subscriber terminal device
Commercial power input part normally used as a power source,
A battery used as a power source when the power of the commercial power input section is cut off,
Paging channel monitoring period control means for setting a paging channel monitoring period based on a paging channel monitoring period value received from the base station;
Power supply monitoring means for determining whether the current operation mode is a commercial power supply mode that operates using the commercial power supply input unit as a power supply or a battery operation mode that operates using the battery as a power supply;
Registration type message generating means for generating a registration type message for notifying the base station side based on the determination result of the power supply monitoring means,
Means for transmitting the registration type message to the base station;
Have
The base station
Registration type monitoring means for determining whether the operation mode of the subscriber terminal device is a commercial power supply operation mode or a battery operation mode based on the registration type message received from the subscriber terminal device;
The paging channel monitoring cycle value is set to be longer than the normal cycle value when the operation mode of the subscriber terminal device is the battery operation mode, and is set to the normal cycle value when the operation mode is the commercial power supply operation mode. Monitoring period value generating means;
Means for transmitting the paging channel monitoring period value set by the paging channel monitoring period value generating means to the subscriber terminal device;
Having
A WLL system characterized by that. In a paging channel monitoring cycle setting method in a WLL system that transmits a page message from a base station to a subscriber terminal device using a paging channel,
The subscriber terminal device is provided with a commercial power input unit normally used as a power source and a battery used as a power source when the commercial power source input unit is powered off.
The subscriber terminal device
Determining whether the current operation mode is a commercial power mode that operates using the commercial power input unit as a power source or a battery operation mode that operates using the battery as a power source;
Generating a registration type message based on the determination result of the operation mode;
Sending the registration type message to the base station;
The base station
Based on the registration type message received from the subscriber terminal device, determine whether the operation mode of the subscriber terminal device is a commercial power supply operation mode or a battery operation mode,
When the operation mode of the subscriber terminal device is a battery operation mode, the paging channel monitoring cycle value is set longer than the normal cycle value,
When the operation mode of the subscriber terminal device is a commercial power supply operation mode, the paging channel monitoring cycle value is set to the normal cycle value,
Transmitting the set paging channel monitoring cycle value to the subscriber terminal device;
The subscriber terminal device
Setting a paging channel monitoring period based on a paging channel monitoring period value received from the base station;
A paging channel monitoring period setting method in a WLL system.

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