JP2001308776A - Mobile communication method and mobile station - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that a conventional mobile communications system may take time for the selection of a perch CH where a UPCH does not exist, due to useless treatments and may take time by selecting a perch CH where a UPCH exists in. SOLUTION: A mobile station stores a perch CH where UPCH information exists in a memory in the mobile station prior to communication by a real UPCH. Then, the mobile station performs a perch CH scan by the CH which judged the perch with UPCH, when scanning the perch CH (step 103). The mobile station judges whether or not the received signal strength level of the perch CH is more than a effective level (step 104). When the level is more than the effective level, synchronization establishment processing in the perch CH is performed (step 105). Thereby, as compared with scanning of all perch channels unconditionally and in order as conventional, the synchronization establishment can be performed in a short time at high speed by the perch CH to shift to a waiting state.

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 the stored perch CHs are sequentially received, the so-called perch CH scan of sequentially measuring the received electric field strength is performed, and the measured electric field strength levels are stored in the memory in order from the higher one. 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 by 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. In the predetermined information broadcast by the broadcast information, presence or absence information indicating whether or not to be transmitted from the base station in the perch channel specified by the base station, in advance in the mobile station before communication in association with the designated perch channel Before the start of communication using predetermined information, a perch channel in which predetermined information exists is stored in the storage means. Sometimes, the first step of measuring the received electric field strength at the perch channel to detect whether the received electric field strength is higher than the effective level, and the first step cannot detect the perch channel having the received electric field strength higher than the effective level. When the perch channel in which the predetermined information is present is not stored in the storage means, or when all the perch channels other than the perch channel stored as the perch channel in which the predetermined information is present are stopped, A second step of performing a tree channel scan to detect a perch channel having a reception electric field strength equal to or higher than the effective level; and a step of detecting the reception electric field strength level of the perch channels detected in the first step or the second step. Perform synchronization establishment processing in descending order, and from the base station on the perch channel where synchronization was established first. Characterized in that it comprises a third step of receiving the broadcast information signal.

[0011] 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 is in a standby state on the perch channel specified by the base station from the broadcast information. In addition, as shown in the principle configuration diagram of FIG. 3, the configuration includes a storage unit 11, a first detection unit 12, a second detection unit 13, and a synchronization establishment unit 14.

Here, the storage means 11 stores presence / absence information indicating whether or not the predetermined information broadcast by the broadcast information is transmitted from the base station through a perch channel designated by the base station.
It is stored in advance before communication in association with the designated perch channel. Prior to the start of communication using the predetermined information, the first detection means 12 measures the received electric field strength of 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. The second detecting means 13
When the first detection means 12 cannot detect a perch channel having a received electric field strength equal to or higher than the effective level, or when the storage means 11 does not store a perch channel having the predetermined information, the predetermined information is A perch channel scan is performed for all the perch channels other than the perch channels stored as existing perch channels, and a perch channel having a received electric field strength equal to or higher than the effective level is detected.

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.

Here, in the mobile communication method and the mobile station of the present invention, the predetermined information broadcast by the broadcast information is:
The PDC mobile communication system is characterized in that it is UPCH presence information.

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]

 DESCRIPTION OF SYMBOLS 11 Storage means 12 1st detection means 13 2nd detection means 14 Synchronization establishment means 101-109, 201-206 step

Claims (6)

[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 presence / absence information indicating whether or not to be transmitted from the base station on the perch channel to be transmitted is stored in advance in a storage unit in the mobile station in advance of communication in association with the designated perch channel, and the predetermined information is used. Prior to the start of the communication, when the storage means stores a perch channel in which the predetermined information exists, the perch channel A first step of measuring whether or not the received electric field strength is higher than the effective level by measuring the received electric field strength, and when the perch channel of the received electric field strength higher than the effective level cannot be detected by the first step, or When the perch channel in which the predetermined information is present is not stored in the means, all of the perch channels other than the perch channel stored as the perch channel in which the predetermined information is present are stored in the perch channel. A second step of performing a scan to detect a perch channel having a reception electric field strength equal to or higher than an effective level; and a step of detecting the reception electric field strength level of the perch channels detected in the first step or the second step. Performs synchronization establishment processing in descending order and transmits from the base station on the perch channel where synchronization was established first. And a third step of receiving the broadcast information. 2. The mobile communication method according to claim 1, wherein the predetermined information broadcast in the broadcast information is UPCH presence information in a PDC mobile communication system. 3. When the communication by the UPCH is not performed, the processing in the first and second steps is not performed,
The mobile communication method according to claim 2, further comprising a fourth step of performing a perch channel scan of all of a plurality of perch channels stored in advance. 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 Storage means for storing in advance presence or absence information indicating whether or not transmitted from the base station in the perch channel specified by the base station before communication in association with the specified perch channel, the predetermined Prior to the start of communication using information, when a perch channel in which the predetermined information exists is stored in the storage means, the perch is First detecting means for measuring whether or not the received electric field strength is higher than the effective level by measuring the received electric field strength at the channel; and when the perch channel having the received electric field strength higher than the effective level cannot be detected by the first detecting means. Or, when the perch channel in which the predetermined information is present is not stored in the storage means, all of the perch channels other than the perch channel stored as the perch channel in which the predetermined information is present, Second detection means for performing the perch channel scan to detect a perch channel having a received electric field strength equal to or higher than an effective level; and a perch channel detected by the first detection means or the second detection means. Out of the received electric field strength levels, the base station performs And a synchronization establishing means for receiving broadcast information transmitted from the mobile station. 5. The mobile station according to claim 4, wherein the predetermined information broadcast in the broadcast information is UPCH presence information in a PDC mobile communication system. 6. When the communication by the UPCH is not performed, the operation by the first and second detection units is not performed,
6. The mobile station according to claim 5, further comprising a determination unit for performing a perch channel scan of all of a plurality of perch channels stored in advance.