JP3457627B2 - Mobile communication method and mobile station - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a mobile communication method and a mobile station, and more particularly to a mobile communication method and a mobile station for performing packet data communication between a base station and a mobile station by using a user packet channel (UPCH).

[0002]

2. Description of the Related Art Conventionally, as a mobile communication system in which a service zone is divided into a plurality of zones and a base station is arranged at the center of each of the divided zones, a digital mobile phone (PDC: Personal Digital Cellular) type mobile communication is used. Systems are known. In the PDC mobile communication system, in order to perform packet data communication between the base station and the mobile station using the UPCH, the base station located at the center of the wireless zone in which the local station is currently located is premised. It is necessary to search for the perch channel (CH) of which frequency is used, and confirm the UPCH presence / absence information transmitted from the base station in the broadcast information using the perch CH.

[0003] Therefore, when the mobile station is powered on, first, the carrier (for example, DoCoM) with which the mobile station is contracted.
o, a memory in the mobile station storing a table in which the channel numbers and frequency codes of many (for example, 80 waves) perch CHs assigned to J-PHONE, TU-KA, etc. are associated. Then, all of the stored perch CHs are sequentially received, and a so-called perch CH scan of sequentially measuring the received electric field strength is performed. BCC in the control CH transmitted from the base station in a time-division manner at the frequency of the perch CH by establishing synchronization with the perch CH having the highest measured electric field strength level.
From the broadcast information of H, the mobile station selects a perch CH that the base station designated by the base station should wait for.

Here, the base station specifies the perch CH to the mobile station because the same frequency C is used between adjacent base stations.
If H is used as a perch CH, radio wave interference occurs, so that different base stations use different frequencies CH.
This is because the same frequency can be repeatedly used in a remote wireless zone to effectively use the frequency.

[0005] After the above-mentioned perch CH is selected, a standby state is established. After that, the UPCH is used not only to exchange packet data but also to exchange protocol data for controlling packet data maintenance, voice switching and the like. In addition, two-way communication can be performed with a partner terminal via a base station.

[0006]

However, in the above-mentioned conventional mobile communication system, even in the case of the same perch CH including the UPCH, the UPC is not used in different radio zones.
Since H may not be included, the perch CH stored in the memory in the mobile station does not include the presence / absence information of the UPCH, and is not transmitted from the base station until the broadcast information is received on the perch CH. UPC to specified perch CH
It is not known whether H exists or not, and the perch CH scan is performed unconditionally.

Moreover, as a result of the perch CH scan, synchronization is temporarily established with the perch CH having the highest measured electric field strength level, and the control CH transmitted from the base station in a time-division manner at the frequency of the perch CH. If it is indicated that the UPCH does not exist in the perch CH specified by the broadcast information of the BCCH, the mobile station performs the same operation as described above on the perch CH having the next highest measured electric field strength level to perform the UPC.
The search for the perch CH in which H exists must be repeated until the search for the perch CH in which UPCH exists.

[0008] For this reason, in the above-mentioned conventional mobile communication system, wasteful processing and time are generated by selecting a perch CH having no UPCH, and time is required until a perch CH having the UPCH is selected. There is a problem that it may take.

[0009] The present invention has been made in view of the above points,
It is an object of the present invention to provide a mobile communication method and a mobile station capable of shortening the time until standby or establishment of UPCH synchronization.

[0010]

In order to achieve the above object, a mobile communication method according to the present invention provides a perch channel for measuring a received electric field strength for each of a plurality of perch channels stored in advance by a mobile station. A mobile communication method that scans, receives broadcast information transmitted from a base station on a perch channel having a high measured received electric field strength, and sets the mobile station in a standby state on a perch channel specified by the base station based on the broadcast information. The predetermined information broadcast by the broadcast information is present in a perch channel designated by the base station .
The information that indicates whether that, is stored in storage means in advance the mobile station before communication in association with the specified perch channel, prior to the start of communication using predetermined information, the predetermined information in the storage means When an existing perch channel is stored, a first step of measuring a reception electric field strength in the perch channel to detect whether or not the reception electric field is higher than an effective level; The perch channel of the electric field strength could not be detected
Sometimes , a perch channel scan is performed for all of the perch channels other than the perch channel stored in the storage means as the perch channel in which the predetermined information exists, and the perch channels having a received electric field strength equal to or higher than the effective level are scanned. a second step of detecting, in a storage means
The perch channel where the predetermined information exists is stored.
If not, or above the effective level by the second step
When the perch channel of the received electric field strength cannot be detected
Means a plurality of perch channels stored in the storage means in advance.
Scan all perch channels to make sure
Detects perch channels with received field strength above the bell
In the third step and the first, second , or third step , the synchronization establishment process is performed in the descending order of the reception electric field strength level among the perch channels detected, and the first synchronization is stopped. And a fourth step of receiving broadcast information transmitted from the base station through the tree channel.

Further, in order to achieve the above object, the mobile station of the present invention performs a perch channel scan for measuring a received electric field strength for each of a plurality of perch channels stored in advance by the mobile station, and performs the measurement. The mobile station used in a mobile communication system in which the mobile station used in a mobile communication system receives broadcast information transmitted from a base station on a perch channel having a high received electric field strength, and the mobile station enters a standby state on a perch channel specified by the base station from the broadcast information. Then, as shown in the principle configuration diagram of FIG. 3, the storage unit 11, the first detection unit 12, the second detection unit 13, the synchronization establishment unit 14, and the third
And a detecting means .

Here, the storage unit 11 stores, in the designated perch channel, the presence / absence information indicating whether or not the predetermined information broadcast in the broadcast information is transmitted from the base station through the perch channel specified by the base station. The information is stored in advance in association with the communication. Prior to the start of communication using the predetermined information, the first detection means 12 measures the reception electric field strength in the perch channel when the storage means 11 stores a perch channel in which the predetermined information exists. To detect if it is above the effective level. Second detection means 13
It is when it does not detect a valid level above the perch channel received signal strength by the first detecting means 12
Is stored as a perch channel where the given information exists
A perch channel scan is performed for all the perch channels other than the perch channels stored in the means 11, and a perch channel having a received electric field strength equal to or higher than the effective level is detected. Further, the third detecting means includes a storage unit.
The perch channel in which the predetermined information exists in the means 11 is recorded.
When it is not memorized, or
Detects perch channels with a received field strength above the effective level
If it is not possible, copy the data stored in the storage means 11 in advance.
Number of perch channels all perch channel scans
The perch of the received field strength above the effective level.
Find the channel.

The synchronization establishing means 14 comprises a first detecting means 1
2 or the synchronization establishment processing is performed in the order of the received electric field strength level of the perch channels detected by the second detection means 13, and the broadcast information transmitted from the base station on the perch channel on which the synchronization was first established is wirelessly transmitted. The signal is received via the unit 10.

[0014] Here, in the mobile communication method and a mobile station of the present invention described above, the predetermined information broadcast by the broadcast information, and wherein the UP CH der <br/> Rukoto in PDC system mobile communication system .

According to the mobile communication method and the mobile station of the present invention, predetermined information (for example, UPCH presence information) which is previously broadcast by broadcast information is included in perch channel information of the storage means initially set in the mobile station. Is registered beforehand in advance of communication in association with the designated perch channel indicating presence / absence information indicating whether or not the signal is transmitted from the base station on the perch channel specified by the base station, thereby enabling communication using predetermined information ( For example, when performing packet communication using UPCH), instead of performing unconditionally a perch channel scan for measuring the received electric field strength for all perch channels, for a perch channel in which predetermined information exists,
Since the scan for measuring the reception electric field strength is preferentially performed, it is possible to prevent a perch channel that does not include wasteful predetermined information during the perch channel scan from being selected.

Further, according to the present invention, when communication by UPCH is not performed, the operation of the first and second detecting means is not performed, and the perch channel scan of all of the plurality of perch channels stored in advance is performed. It is characterized in that it further comprises a judging means.

[0017]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a flowchart for explaining the operation of a mobile communication method and a mobile station according to an embodiment of the present invention, and FIG. 2 is a flowchart for explaining the operation at the time of initial setting of the method of the present invention. However, FIG. 1 shows the operation up to the channel selection transition.

Here, in the mobile communication system of the PDC system, a mobile station having no voice communication function (want to perform only the Internet and e-mail) and a mobile station wishing to perform both voice communication and packet communication (however, packet communication is required) Mobile stations that want to perform both voice communication and packet communication (mainly want to mainly perform voice communication), mobile stations that do not have a packet communication function (only perform voice communication), and the like can be considered. This embodiment is applied to a mobile station (i-mode mobile station or the like) used for packet communication priority.

In this embodiment, prior to actual use after shipment from the factory, the mobile station performs the following operations in accordance with the flowchart of FIG.
The perch CH in which the UPCH information exists is stored in a memory in the mobile station. That is, when the power is turned on and the perch CH
From the memory in the mobile station storing a table in which the channel number and the frequency code are associated with each other, sequentially receive all the stored perch CHs, and sequentially measure the received electric field strength, a so-called stop. A tree CH scan is performed (step 201), and among the measured field strength levels, the field strength levels that are equal to or higher than the effective level at which communication or control can be maintained are arranged in descending order and stored in the memory (step 202).

Subsequently, synchronization is established with the perch CH having the highest measured electric field strength level among the stored measured electric field strength levels (step 203), and transmitted from the base station in a time-division manner at the frequency of the perch CH. B in the incoming control CH
From the broadcast information of the CCH, it is determined whether or not the perch CH has an UPCH (step 204). If there is an UPCH in the perch CH that has been synchronously established, the process ends by setting, for example, a flag indicating that there is UPCH information in the memory in association with the perch CH (step 205).

On the other hand, UPC is
If H does not exist, if there is a perch CH having the next highest received electric field strength level, synchronization is established with the perch CH (steps 206 and 203), and the same operation as above is performed. In this way, the UPC is stored in the memory of the mobile station.
One perch CH with H is stored. From this state, an actual standby state may be entered and used, or the use may be stopped and the power may be turned off. The above is the operation of the storage unit 11.

Thereafter, when the power of the mobile station is turned on during actual use, or when a mobile station outside the service area enters the wireless zone, the mobile station performs an operation according to the flowchart of FIG. . That is, the mobile station determines whether or not the packet communication function is enabled by the user, that is, whether or not the user wants to perform packet communication (step 101). It is determined whether or not the determined CH is stored (step 102).

When the perch-judged CH with the UPCH is stored, the perch CH is scanned by the perch-judged CH with the UPCH (step 103), and the reception electric field strength level of the perch CH is valid. It is determined whether the level is higher than the level (step 10).
4) If the level is equal to or higher than the effective level, the synchronization establishment process is performed on the perch CH (step 105). The processing of the above steps 102 to 104 is the processing by the first detecting means 12. The second detecting means 13 performs the processing of steps 106 to 109, which will be described later.
5 is performed by the synchronization establishing means 14.

On the other hand, in step 104, the mobile station
When it is determined that the received electric field strength level of the presence of the perch is determined to be less than the effective level, a perch CH scan is performed on the perch without the UPCH (step 106). This perch CH without UPCH is all perch CHs registered in advance in the memory in the mobile station.
Of these, perch CHs other than the perch CH registered in the memory as having an UPCH according to the flowchart of FIG. Therefore, in the perch CH without UPCH, the perch C in which the UPCH actually exists is included.
H is also possible.

For the perch CH without UPCH,
The received electric field strength is sequentially measured, and it is determined whether or not the received electric field strength level is higher than the effective level (step 107).
Synchronization establishment processing is performed on the perch CH having the highest reception electric field strength level among them (step 105).

When it is determined in step 101 that the packet communication function is invalid (that is, no packet communication is performed), or in step 102, the UPCH perch CH
When it is determined that the determined CH is not stored in the memory, or at step 107
If it is determined that there is no perch CH without CH, the process proceeds to step 108, and the conventional perch scan processing (conventional perch CH scan) of all channels described in the related art is performed.

As a result of the above-described perch CH scanning of all the channels, it is determined whether or not there is a perch CH having a valid level or higher (step 109). (Step 1
05). If there is no perch CH equal to or higher than the effective level, the process returns to step 101 and starts over from the beginning. Although the synchronization establishment process is performed in step 105, if the synchronization establishment fails, the synchronization establishment process of the next level perch CH is performed. If the next level perch CH no longer exists, the process returns to step 101 and starts over from the beginning.

As described above, in this embodiment, the perch CH scan performed immediately after the power is turned on or the like is performed by the UPCH
Perch CH stored as a perch CH
Has been given priority for scanning.
It is faster and faster than in the conventional method to scan all the perch channels unconditionally in order to establish synchronization with the perch CH and shift to the standby state, and thus consume less power than before. it can. In addition, UP
The CH presence / absence information may be updated when the broadcast information has been received.

The present invention is not limited to the above-described embodiment. For example, the present invention is not limited to the UPCH information but may be applied to any other information that can be distinguished by the perch CH. Can be. This case can be realized by replacing the processing of steps 101, 102, 103 and 106 with information that can be distinguished by the perch CH.
Even if a conventional perch CH scan is performed,
Equivalent processing can be performed.

As described above, according to the present invention,
When waiting to perform communication using predetermined information (for example, packet communication using UPCH), predetermined information (UPC added to a perch channel in advance)
(H presence information), by performing a scan for preferentially measuring the reception electric field strength for the perch channel in which the perch channel does not include predetermined information that does not include wasteful predetermined information during perch channel scanning. The time required for standby or until the completion of the UPCH synchronization establishment can be reduced as compared with the related art, so that power consumption can be reduced and battery life can be extended.

[Brief description of the drawings]

FIG. 1 is a flowchart for explaining the operation of an embodiment of the present invention.

FIG. 2 is a flowchart for explaining an example of an operation at the time of initial setting of the method of the present invention.

FIG. 3 is a diagram illustrating the principle configuration of a mobile station according to the present invention.

[Explanation of symbols]

11 storage means 12 First detecting means 13 Second detection means 14 Synchronization establishment means 101-109, 201-206 steps

Claims (6)

(57) [Claims] 1. A mobile station performs a perch channel scan for measuring a received electric field strength for each of a plurality of perch channels stored in advance, and the measured received electric field strength is transmitted from the base station via a high perch channel. The mobile communication method in which the mobile station enters a standby state on a perch channel specified by the base station from the broadcast information, wherein the predetermined information broadcast by the broadcast information is specified by the base station. the information that indicates whether how blind present in the tree channels, the association with the specified perch channel stored in the storage unit in advance the mobile station before communication advance, prior to the start of communication using the predetermined information When the perch channel in which the predetermined information exists is stored in the storage means, the received electric field strength in the perch channel A first step of detecting whether a measured and effective level above, sometimes could not detect a valid level or higher of the perch channel received signal strength by the first step, stop the predetermined information is present The above description as a tree channel
For all blind blind other than wood channel tree channel stored in憶means, the blind performed trees channel scan, a second step of detecting a valid level above the perch channel reception field intensity, the storage A perch tree in which the predetermined information exists
When the cell is not stored, or in the second step
Perch of received electric field strength above the effective level
If a channel cannot be detected, it is stored in the storage means in advance.
Remember multiple perch channels all perch switches
Perform a channel scan and check that the received electric field strength
A third step of detecting a perch channel of said degree, said first step, or said second step , or before
Performing synchronization establishment processing in descending order of the received electric field strength level among the perch channels detected in the third step ;
A fourth step of receiving broadcast information transmitted from the base station through a perch channel in which synchronization has been established first. 2. A plurality of pauses stored in a mobile station in advance.
To measure the received signal strength for, respectively that of the tree channel
Performed perch channel scan and measured received field strength
Broadcast transmitted from the base station on a high perch channel
Information, and the base station designates from the broadcast information.
Mobile traffic that causes the mobile station to wait on the perch channel
In the communication method, the predetermined information broadcast by the broadcast information is transmitted by the base station.
Yes to indicate if it is on the specified perch channel
No information is communicated in association with the designated perch channel
Beforehand in the storage means in the mobile station, and before starting communication using the predetermined information , the storage means
Means for recording the perch channel in which the predetermined information exists.
When remembered, receive on that perch channel
Measures electric field strength and detects whether it is above effective level
A receiving electric field strength equal to or higher than an effective level by the first step.
If no perch channel is detected,
The perch channel on which the predetermined information exists
Stops other than the perch channel stored in memory
For all of the tree channels, the perch channels
Scan to stop the reception field strength above the effective level.
A second step of detecting a tree channel, and when communication using the predetermined information is not performed, or
A perch channel in which the predetermined information exists in the storage means.
Is not stored, or in the second step
More perch of the received electric field strength above the effective level
If a cell cannot be detected, it is stored in the storage means in advance.
Multiple perch channels all perch cha
Performs a flannel scan to determine the received field strength above the effective level
A third step of detecting a perch channel of said first step, said first step, or said second step, or
The perch channel detected in the third step
The synchronization establishment process is performed in descending order of the reception electric field strength level,
Sent from the base station on the perch channel for which synchronization was initially established.
And a fourth step of receiving the broadcast information signal
The mobile communication method characterized by. 3. Predetermined information notified by the notification information
Is the UPCH in the PDC mobile communication system.
3. The mobile communication method according to claim 1, wherein: 4. The mobile station performs a perch channel scan for measuring a received electric field strength for each of a plurality of perch channels stored in advance, and the measured received electric field strength is transmitted from the base station through a high perch channel. A mobile station used in a mobile communication system in which the mobile station is in a standby state on a perch channel designated by the base station from the broadcast information, and the predetermined information broadcast by the broadcast information is A storage unit for storing presence / absence information indicating whether or not there is a perch channel specified by the base station before communication in association with the specified perch channel; and communication using the predetermined information. Prior to the start, when a perch channel in which the predetermined information is present is stored in the storage means, reception at the perch channel is performed. First detecting means for detecting whether a valid level than by measuring the field strength, sometimes could not detect a valid level or higher of the perch channel received signal strength by the first detection means, of the predetermined the Symbol as a perch channel information exists
For all blind except perch channel tree channel stored in憶means, the blind performed trees channel scanning, second detecting means for detecting an effective level or higher of the perch channel reception field strength, the A perch that has the predetermined information in the storage means
When no cell is stored, or when the second detecting means
Perch of received electric field strength above the effective level
If a channel cannot be detected, it is stored in the storage means in advance.
Remember multiple perch channels all perch switches
Perform a channel scan and check that the received electric field strength
A third detection means for detecting a perch channel of the degree, the first detection means, or the second detection means , or
Performing synchronization establishment processing in the descending order of the reception field strength level among the perch channels detected by the third detection means ;
A mobile station comprising: a synchronization establishing means for receiving broadcast information transmitted from a base station through a perch channel in which synchronization has been initially established. 5. A plurality of pauses stored in a mobile station in advance.
To measure the received signal strength for, respectively that of the tree channel
Performed perch channel scan and measured received field strength
Broadcast transmitted from the base station on a high perch channel
Information, and the base station designates from the broadcast information.
Mobile traffic that causes the mobile station to wait on the perch channel
A mobile station used in a communication system, wherein the predetermined information broadcast by the broadcast information is
Yes to indicate if it is on the specified perch channel
No information is communicated in association with the designated perch channel
Storage means for storing beforehand in advance, and said storage means for starting communication using said predetermined information.
Means for recording the perch channel in which the predetermined information exists.
When remembered, receive on that perch channel
Measures electric field strength and detects whether it is above effective level
A first detecting means for detecting a received electric field strength higher than an effective level by the first detecting means.
If no perch channel is detected,
The perch channel on which the predetermined information exists
Stops other than the perch channel stored in memory
For all of the tree channels, the perch channels
Scan to stop the reception field strength above the effective level.
A second detecting means for detecting a tree channel, when communication using the predetermined information is not performed, or
A perch channel in which the predetermined information exists in the storage means.
Is not stored, or when the second detection means
More perch of the received electric field strength above the effective level
If a cell cannot be detected, it is stored in the storage means in advance.
Multiple perch channels all perch cha
Performs a flannel scan to determine the received field strength above the effective level
And third detection means for detecting the perch channel of the first detection means, the first detection means, or the second detection means, or
The perch channel detected by the third detecting means.
The synchronization establishment process is performed in descending order of the reception electric field strength level,
Sent from the base station on the perch channel for which synchronization was initially established.
And a synchronization establishing unit configured to receive the broadcast information signal
Mobile station, characterized in that. 6. Predetermined information notified by the notification information
Is the UPCH in the PDC mobile communication system.
The mobile station according to claim 4 or 5, wherein