JPS6021641A - Method for registering position of mobile station - Google Patents

Abstract

PURPOSE:To reduce the retrieval time and incoming call losses by avoiding the retrieval when a notice indicates that a radio zone does not exist at a boundary part of a position registration zone in a mobile communication system setting a base station at each radio zone. CONSTITUTION:A control channel common to radio zones 3a-3c is provided at position registration zones 2a-2c respectively and also an exclusive control channel is provided to the radio zones 3a-3c. Whether or not a radio zone belongs to the boundary part of the position registration zone is informed from base stations 4a-4c to a mobile station 6 by using the control channel for exclusive use of the radio zones. The mobile station 6 decides whether or not the retrieval for position registration is executed according to the notice information.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention provides a service area consisting of a plurality of location registration zones, and a location registration station having a registration memory manages at least one location registration zone. This article relates to a method of registering a location to a registration station.

<Back Moon> This type of mobile communication system is currently being put into practical use as a car phone system. That is, in the car telephone system, as shown in FIG. Wireless zone 3a
, 3b, 3c, etc., and a base station 4 is located in each wireless zone 3a, 3b, 3c, etc.
a, 4b, 4c, . . . are provided. For mobile station calls, the selected number dialed by the calling subscriber (mobile station number)
It is difficult to determine the terminating switching center where the mobile station 6 exists by using only the above information. Therefore, one or more wireless zones are grouped together as a location registration zone, and each time a mobile station moves between location registration zones, the mobile station detects which location registration zone it is in. is reported to the location registration station 5. The location registration station stores this information in its registration memory, and also stores this information in which location registration zone each mobile station is in. When a mobile station receives an incoming call, it stores it in a location where the mobile station does not exist. This prevents invalid incoming call processing (such as calling a mobile station) to the registered zone.

Location registration at a mobile station has conventionally been performed as follows. For example, when the mobile station 6 is moving within the radio sea 73a, the position transmitted from each base station is transmitted at fixed time intervals or when the reception level of the signal from the base station becomes below a predetermined value. It sequentially receives control channels unique to the registration zone, determines that the mobile station exists in the location registration zone corresponding to the control channel with the highest reception level, and registers the first position through the control channel as a result of the determination. The location was registered by notifying the station along with the mobile station number.

In this way, the mobile station performs a location registration zone search at regular intervals, and therefore the mobile station moves within the wireless zone near the center of the 1σ registration zone, rather than in the wireless zone at the boundary of the 1σ registration zone, and immediately moves to the adjacent location registration zone. Searches the location registration zone at regular intervals even if there is no possibility of movement, and depending on the radio wave propagation situation, the control channel may be searched even if the user is moving in a wireless zone other than the pure zone at the boundary of the location registration zone. When the reception level of the location becomes below a predetermined value, a location registration zone search is performed. In the past, location registration zone searches were conducted in vain even when there was no possibility of immediate movement to an adjacent location registration zone. While the mobile station is searching for a location registration zone, it becomes impossible to receive a call to the mobile station, and in particular, it is not preferable for a communication system to be unable to receive a call because the mobile station is searching for a useless location registration zone.

Conventionally, location registration zone searches are performed sequentially for control channels of all location registration zones.
16'' When there are many registration zones, it takes a long time to search for a location registration zone.In the past, it took a long time to search for a location registration zone other than the location registration zone where the mobile station is moving and the adjacent location registration zone. The control channel was also searched, which was a fruitless search.

<Narrowness of the Invention> In this J, a control channel common to each wireless zone is provided for each two location registration zones, and a channel dedicated to each wireless zone is provided. ! An i control channel is provided, and a control channel dedicated to the wireless zone is used to notify the base station to the mobile station whether the wireless zone belongs to the boundary of the location registration zone, and the mobile station performs location registration according to this broadcast information. Decide whether to perform a search for. If this notification indicates that the location is not within the boundary of the location registration zone, the search will not be performed even if a location registration zone search request occurs. In this way, useless searches are stopped, and the number of lost calls is reduced accordingly.

Since the mobile station still moves only to an adjacent location registration zone, other location registration zones from which the mobile station may move are determined in advance for each location registration zone or wireless zone, so there is no common By notifying the mobile station of the control channel to be searched through a control channel or a dedicated control channel, and by performing the location registration zone search only on the broadcasted control channel, the mobile station can speed up the location registration zone search 6. This will reduce the number of missed calls.

<Example> As shown in FIG. 1, each location registration sheet 72a, 2b, 2C
111 control channels fs, a, fsb, fsc, etc. common to the wireless zones in the valley zone are assigned to ..., and for example, in the first registration zone 2a, the respective non-registered zones 3a, 3b are applied. , 3c... base stations 4a, 4b,
4c... is the assigned common control channel f
sa is being sent. Furthermore, a dedicated control channel is assigned to each radio channel. For example, this is done by assigning time slots to each base station. In other words, No. 48, which is common throughout the location registration zone, is a common control signal (channel).
There are two time periods for transmitting as a control signal (channel) and a different time period for transmitting as a dedicated control signal (channel) for each reckless zone. These include, for example, 16 registered zones 2a and their respective wireless zones 3a, 3b, 3c...
It is transmitted from each base station 4a, 4b, 4c, . . . on the same frequency f8a. Generally, measures are taken to prevent interference by matching the radio frequency and the phase of the tonalization signal.

FIG. 2 shows an example of one channel on the open side during this time period.

From the location registration station 5 to the valley base stations 4a to 4C, as shown in FIG. 2A, a synchronization signal 7, a common control channel 8, a control channel 9a dedicated to the wireless zone 3a, and a control channel 9b dedicated to the wireless zone 3b .

A dedicated control channel 9c is sequentially sent to the wireless zone 3C.

The control signal relay section in each base station 4a to 4c is configured as shown in FIG. 3, for example. The control signal 48 shown in FIG. The repeater 11 amplifies the control signal and supplies it to the output gate circuit 13. The detector 12 detects the synchronization signal 7 in the control signal and jumps the bit counter 14. The bit counter 14 uses the synchronization signal 7 as a reference. Each time slot of the control number 43 is counted as follows, and the inside of the count is supplied to the gate signal generator 15. The gate signal generator 15 generates a gate (M signal) for taking out the synchronization signal 7 and the common control channel 8, and also outputs a signal from the base station, e.g. 4a.
Gate signals are generated to take out the exclusive control channel 9a of the time slot provided in advance, and these gate signals open the gate circuit 13 and are outputted through the terminal 16 as the transmission ON10FF control signal of the transmitter. Therefore, in the base station 4a, the output terminal 17 of the gate circuit 13 receives the synchronization signal 7 and the common control channel 8 as shown in FIG. 2B.
, exclusive f! A synchronization signal 7, a common control channel 8, and a dedicated control channel 9b are transmitted at the base station 4b as shown in FIG. 2C, and at the base station 4C, the J shown in C: A synchronization signal 7, a common control channel 8, and a dedicated control channel 9C are transmitted. In this way, each Uζ base station transmits a dedicated control channel in a time slot (every time) that is previously assigned to that base station.

As shown in Figure A, the common control channel 8 fqji: It consists of information common to ・1 iris number 21.

Alternatively, this common control signal is composed of an incoming call signal 19 and a common information signal 21, as shown in FIG. 4B.

On the other hand, each dedicated control channel 9a to 9C-12++,'
Corresponding to the common control channel 8 in Figure 4A, Figure 4A
As shown in , it indicates whether the wireless zone of the base station is located near the boundary of the location registration zone, that is, whether the mobile station within the wireless zone performs a location registration zone search. code and a control channel information signal dedicated to its base station, 1C11E4a]

If the common control channel 8 shown in Figure 4B is used, the dedicated control channels 9a to 9C are 80, and the code 22 indicating whether or not to search as shown in Figure 5B, and the mobile station search. Code 23 indicating power p control channels and dedicated control channel information %4'! No. 24.

The mobile station moves from its current location to the +'cr
4'i It is not possible to move to a location registration zone other than the location registration zone at the same time. Therefore, the mobile station can perform a location registration zone search by searching only the 111'' control channel of the location registration zone in which it is currently moving and the control channel of the location registration zone that is in momentary contact with that zone. In other words, the control 1 channel that should be searched according to the location registration zone is determined, and the control AI chaol that should be searched is Ryo 4.
The code 2o in Figure A is sent. Similarly, once the wireless zone is determined, the control channel to be searched during location registration zone detection is determined, and the control channel is transmitted with the 51'=lB code 23 in accordance with each wireless zone.

Location registration zone 2, like glandular zone 3a in Figure No.
If the mobile station 6 is located in the center of the no-win zone 3a and is not near the boundary 1iFJ, the mobile station 6 moving within this no-win zone 3a will be moved to the adjacent position (6 will not move to the registered zone33), so the mobile station !i Location registration zone search (d shall indicate that it is not required) as the code 22 transmitted from the base station in the zone that is not near the boundary of the registration zone. Antenna 30 as shown in
to the reception demodulator 32 via the shared antenna 1'ri 31.
and the modulation aperture portion 37 are connected. Connection control unit 38
Q]j, receiving IN (& mm Mli 3 2, =
It is connected to the knee transmitter 37 and the iM furune 39 to control the connection between them, and after reception, the receiver channel controller 34 operates based on the channel information obtained from the receiver 32. Controls the synchronizer 36 to set channels for the reception demodulator 32 and the shunt transmitter 37;
Reception 1 = a 1 A signal indicating the reception level from the J unit 32 is converted into a digital value by the AD receiver 33 and input to the reception channel control y6s 34. This reception channel control unit 34 also performs a location registration zone search.

This location registration zone search is performed as shown in FIG. 73. When the power of the device is turned on, each fXls is initialized in step S1, and the all control channel searched flag F1 is set in step S2. It is checked whether it is off, and if it is off, the process moves to step S3, and the receiving/old demodulating section 32 is set to the first active channel in the first memory. Step S to enable that control channel.
4, and in step S5, the measured level and the control channel are stored in the second memory in descending order of reception level. In step S6, it is checked whether the reception levels of all control channels in the first memory have been determined, and if the measurement is finished, the next 4ii1 in the first memory is determined in step S7.
Set the 3-key key section 32 on the i channel and proceed to step s.
Return to 4.

When the reception level measurement of all control channels is completed in step S6, all control channels searched flag Ii'l is set in step S8.
Turn on. After that, in step s9, the search is started.
The reception demodulator 3 selects the one with the highest reception level among the l channels.
Set 2. Next, in step S1'o, time slots corresponding to each thermal storage zone in the control channel, ie, dedicated:
li:I Measure each reception level of 11 channels 9a, 9b, 9c (7) and correspond to its maximum level;, 1il
j Determine the conflict zone. In step Sll, it is possible to receive (ii) on the set control channel, -
I'll give you x. This is to confirm whether there was any error in the reception level/l/call processing at that size.

If no signal is received in step Sll, turn on the non-reception flag F2 in step S12 and step Sll.
Move on to 13. In step S13, it is checked whether the moxibustion flag F3 or the flag F3 is checked to determine whether or not the search shown in Figure 5 is to be performed. , if the search flag F3 is off, step S1
4, if the non-receiving flag F2 is on, the all control channel search completed flag F1 is turned off and the process returns to step S2.

Therefore, the process moves to step s3 again and the above-mentioned process is carried out again.
If a signal is received from the I channel, step SI
At step 816, the code 22 in the dedicated control channel is checked to see if it indicates that it should be searched. The code 2 of the control channel to be searched shown in the control channel or the code 23 of the control channel to be searched shown in the dedicated control channel is stored in the 3rd memory ()(Δ) and step S +
-Move to 7. If the search flag F3 is off in step S15, the process immediately moves to step 817 to check whether there is an M call, and if there is an incoming call, the incoming call process is performed in step S8. return.

On the other hand, in step S2, all? When the search for the I+lI control channel is completed, the flag li' 11d is turned on, and the process moves to steps S19 and 820K. The Stesoge 319 checks whether a certain period of time has elapsed, and when a certain HM li+f has elapsed, the process moves to step S13, and in step S20 it checks whether the reception level has fallen below the set value, and if it has fallen below the set value, the process moves to step S20. Proceed to S13. If the search flag F3 is off in step S13, step.

Iterates through the loop. In step 813, search flag F3
If it is on, the process moves to step S21, sets the price adjustment section 32 to the first control channel of the control channels to be searched previously stored in the third memory, and sets the reception level at that time to step S22. In step S23, the results of the 6th and 11th measurements and the control channel are stored in the second memory in descending order of reception level. In step S24, the third
Check whether all the control channels written in the memory to be searched have been searched. If all the searches have not been completed, in step S25, the next control channel in the third memory is searched. Part 32 all 32 and step S22
Return to If all the control channels /L to be searched have been searched in step 824, the process moves to step S9.3゜According to the control channel set in step Sll,
The code indicating the control channel and the mobile station number are sent to the location registration station 5 through the base station, and the location of the mobile station is registered.

<Effect> When the device power is turned on as described above (d) all control channels are searched, but after that, the position σ zone search is performed only when search code 22 instructs a search,
If this does not instruct a search, the location registration zone search will not be performed even if a certain period of time has elapsed for the conventional location registration zone search, or even if the reception level drops below the set value. Even if this search is not performed, the mobile station will not deviate from the current location registration zone, and there is a risk that calling of the mobile station will be hindered. This reduces incoming call loss to the mobile station. From this point of view, the search time is short because, except for searching all control channels when the source device 71j is turned on, only the control channels to be searched specified by the control channel are searched. Also, there will be fewer missed calls.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a mobile communication system to which this invention is applied;
FIG. 2 is a time chart showing an example of relaying a common control signal in a plurality of wireless zones in a base station, FIG. 3 is a block diagram showing an implementation sequence of a common control signal relay unit in a base station, and FIG. The figure shows an example of the common control signal at the base station.
Figure 266 is a block diagram of a main part of an embodiment of a mobile station, and Figure 7 is a flowchart showing an example of operation in a mobile station. Location registration zone: 3: None 1
'14j zone, 4a to 4C: Base station, 5: Location registration station, 6: Mobile station, 7: Synchronization of valley base station/Synchronization width pair, 8: Information common to base stations, J number , 9a-9C:
Dedicated control channel for each blank, 1 green zone 3a to 3C,
9: Incoming call signal, 20: Control channel code to be searched, 21: Information code common to base stations, 22: Surrounding zone indication signal (search code signal), 23: Opening/channel code to be searched. 24: 11° per base station! "Report fr
';j'. Patent author: Nihon City, Kadenzume Public Corporation agent Kusano, Oki square 2, 3 Figure 4, closed

Claims (3)

[Claims] (1) Control for communication connection in a mobile communication system where the service area consists of multiple location registration zones, each location registration zone consists of at least one wireless zone, and a base station is installed in each wireless zone. As channels, a control channel common to each wireless zone within the location registration zone and a control channel dedicated to each wireless zone are provided, and whether or not a mobile station belongs to an fJI-free zone at the boundary of the location registration zone is provided. The mobile station is characterized by transmitting a notification from the base station to the mobile station 71771 using a control channel dedicated to the wireless zone, and determining whether or not the mobile station should search for the first 11th registration in accordance with this broadcast 1゛H information. mobile station location registration method. (2) When a mobile station belongs to an uncharged zone at the boundary of a location registration zone and performs a search for location registration, the control channel to be searched by the mobile station is set to a radio channel within the location registration zone to which the mobile station belongs. A base station broadcasts information to a mobile station using a common control channel in a zone, and the mobile station searches for a control channel and registers a location according to this broadcast information. Mobile station location registration method. (3) If the mobile station belongs to a wireless zone at the boundary of the location registration sheath and performs a search for location registration, the control channel to be searched by the mobile station is determined using a control channel dedicated to each wireless zone. The mobile station location registration method according to the scope of the patent application, item 1, characterized in that a base station broadcasts information to a mobile station, and the mobile station searches for a control channel in accordance with the broadcast information and performs location registration.