JPH0837686A - Access method for radio telephone system, and radio telephone system and its access method - Google Patents

Abstract

PURPOSE:To extend a channel acquisition range by acquiring a Pch (paging channel) as an Ach(access channel) when the frequency ranges of the Pch and the Ach are equal. CONSTITUTION:A Pch acquisition means 11 receives an overhead message OM from the Pch and stores it in a memory 20. In the case of CPA20c=1 of the OM of the Pch, a Pch data processing means 12 defines the Ach to be acquired as the channel of the frequency range of the Pch, the Ach acqusition means 16 performs an acquisition processing and an access processing is ended. At the time of CPA20cnot equal to 1, '0' is set in a ROAM 42 when a SID 20a inside the memory 20 and the SIDH of a NAM 40 match and '1' is set in the ROAM 42 when they do not match. Then, the scanning and deciding processings of the Ach are performed, the acquisition processing of the Ach is performed in the means 16 and the access processing is ended. Thus, the channel is quickly and surely acquired.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiotelephone system for performing communication between a base station managed by the system and a mobile unit of a portable radiotelephone, and particularly to an access channel not related to a desired radiotelephone system. The present invention relates to an access method for a wireless telephone system, a wireless telephone system, and an access method for the same, which can reduce the rate of machine tuning and can quickly acquire a desired access channel.

[0002]

2. Description of the Related Art A cellular radio telephone system is generally known as a multi-zone radio telephone system. A conventional cellular radiotelephone system covers a relatively large geographical area by using a plurality of small radio zones called cells.

A conventional cellular radio telephone system will be described with reference to FIG. FIG. 4 is a schematic diagram of a conventional wireless telephone system. As shown in FIG. 4, a conventional radiotelephone system includes a base station 1a that covers a cell A (area A) under the control of the system a, a mobile unit 3 that uses the system a as a home system, and a system b. Cell B under control
And a base station 1b that covers the

Explaining the operation of the radio telephone system shown in FIG. 4, a control channel (paging channel: Pch) and an access channel (Ach) are given from the base station 1, and the mobile unit 3 receives the control channel (Pch). It captures, scans the range in which Ach included in the overhead message of Pch exists, receives a plurality of Achs, and selects a certain number of Achs from those having a higher electric field strength level in the scan list. Store. Then, the mobile unit 3 selects the Ach having the best signal strength from the scan list and stores the system identifier (SID) of the selected channel in the internal memory or the like. This state is the state in which the channel is captured and the telephone call can be made.

However, in the case where the coverage areas of adjacent cells of different systems overlap such that cell A and cell B overlap in FIG. 4, the mobile unit 3 uses the home system (system a here). Even if it is desirable to access the base station 1a of the cell A in (1), the mobile unit 3 selects the channel (Ach) having the best selection strength as described above, so that another adjacent system (here, It may acquire a channel from the base station 1b of cell B of system b).

In this case, the mobile unit 3 leaves the control channel in the Ach in the cell B, and the mobile unit 3 is connected to another system (here, system b) due to radio propagation or the like. I captured Ach,
There were cases where unnecessary access operations were performed and in some cases access could not be completed.

As a solution to the above problem, a conventional access method for a wireless telephone system will be described with reference to FIG. FIG. 5 is a flowchart showing a processing flow of an access method of the mobile unit 3 of the conventional wireless telephone system. As shown in FIG. 5, the processing of the access method of the mobile unit 3 of the conventional wireless telephone system acquires Pch of the control channel (300), receives the overhead message included in the Pch, and includes it in the overhead message. The stored system identifier (SID) is stored (302). Next, Ach is scanned based on the information of the existence range of Ach shown in the overhead message of Pch, and N of the strongest signals are selected and stored in the scan list in the order of strong signals (310).

As a result, it is judged whether there is Ach in the scan list (320). If there is no Ach in the scan list, the access process is terminated as an access failure, and if there is Ach in the scan list, the scan list is found. Among them, the Ach with the highest signal strength is read, the read Ach is selected (322), and the Ach system identifier (SID ') is selected from the overhead message in the Ach channel data.
Read (324), and further, Pch SID and Ach
SID ′ of the same (326), and if they are the same, Ach
Is acquired (330), the channel is acquired, and the access processing ends.

On the other hand, in process 326, SID of Pch
And SID ′ of Ach are not the same, processing 320
Returning to, Ach with the next highest signal strength in the scan list
The process (process 320 to process 326) of comparing the system identifiers of Pch and Ach is performed.

That is, SID of Pch and SI of Ach
Since the channel is not captured when D'is different, it is possible to access only the desired system without capturing the Ach of another system and prevent the incompletion of access. It is possible.

[0011]

However, in the above-mentioned conventional access method for the wireless telephone system, even if the frequency range of Pch and the frequency range of Ach are the same, Ach
Scan and store in the scan list, select the Ach with the best signal strength, and select the SID 'of that Ach and the Sch of Pch.
Compare with the ID, and when SID = SID ', Ac
Since h is captured, there is a problem that it takes a long time to capture the channel and the processing cannot be performed quickly.

Further, even if the Pch frequency range and the Ach frequency range are the same, if the corresponding Ach is not stored in the scan list, the access fails and the initialization state is restored and the process must be performed from the beginning. Therefore, there is a problem that the Ach cannot be reliably captured.

The present invention has been made in view of the above circumstances, and it is possible to reduce the ratio of the mobile unit tuning to an Ach that is not related to a desired radio telephone system, and to quickly and surely acquire a channel. An object of the present invention is to provide a wireless telephone system access method, a wireless telephone system and an access method thereof.

[0014]

According to a first aspect of the present invention for solving the above-mentioned problems of the conventional example, a mobile unit transmits a paging channel (Pch) and an access channel (Ach) transmitted from a base station. In the access method of the wireless telephone system for capturing, the mobile unit unit reads information indicating whether the frequency range of the Pch and the frequency range of the Ach included in the overhead message of the Pch are equal to each other, and the frequency range of the Pch and the frequency range of the Ach are read. When the frequency ranges are equal, the Pch channel is Ac
It is characterized in that it is captured as a channel of h.

The invention according to claim 2 for solving the problems of the above-mentioned conventional example is a Pch in a radio telephone system.
And a Pch capturing means that captures the Pch overhead message and scans the Ach to obtain a candidate Ac.
Ach scanning means for storing h in the scanning list in order from the highest signal strength, Ach selection means for selecting Ach in order from the scanning list and storing the overhead message of the Ach, and Pch and Ach frequency range It is determined whether or not they are equal, and if they are equal, it is determined that the channel of Pch is an Ach channel to be captured, and Pch and A
Pch data processing means for comparing the identifier of the home system held by the mobile unit with the system identifier of the Pch in the overhead message of the Pch when the frequency ranges of the channels are not equal, and the identifier of the home system and the identifier of the Pch A of the home system is compared with the system identifier of Ach in the overhead message of Ach to obtain A.
It is characterized by having Ach data processing means for determining a channel of ch and Ach acquisition means for acquiring the Ach determined by the Pch data processing means or the Ach data processing means.

According to the invention of claim 3 for solving the above-mentioned problems of the conventional example, in the access method of the radio telephone system according to claim 2, the Pch capturing means captures the Pch and stores the Pch overhead message. And Ac
The h scanning means scans the Achs, and the candidate Achs are stored in the scan list in order from the one having the highest signal strength.
The selecting means sequentially selects the Ach from the scan list, stores the overhead message of the Ach, and the Pch data processing means determines whether or not the frequency ranges of the Pch and the Ach are equal, and if they are equal, captures the channel of the Pch. Determined as Ach channel, Pch and Ach
Comparing the home system identifier of the mobile unit with the Pch system identifier in the Pch overhead message when the frequency ranges are not equal,
When the identifier of the home system and the identifier of the Pch are equal, the Ach data processing means compares the identifier of the home system with the system identifier of the Ach in the overhead message of the Ach to determine a channel of the Ach to be captured, Ac determined by the Ach capturing means by the Pch data processing means or the Ach data processing means
It is characterized by capturing h.

According to a fourth aspect of the present invention for solving the above-mentioned problems of the conventional example, in the wireless telephone system according to the second aspect, the Ach data processing means has a home system identifier and a Pch of the mobile unit. When the identifiers are not equal, the system attribute in the Pch overhead message is compared with the system attribute in the Ach overhead message, and if they are equal, the Ach is determined as a channel of the Ach to be captured.
The capturing means is a means for capturing the determined Ach.

According to the invention of claim 5 for solving the problems of the conventional example, in the access method of the radiotelephone system according to claim 4, the Ach data processing means has an identifier of a home system possessed by the mobile unit. And the identifier of Pch are not equal, the system attribute in the overhead message of Pch is compared with the system attribute in the overhead message of Ach, and when they are equal, it is determined as the channel of Ach that captures the Ach,
The Ach capturing means captures the determined Ach.

According to a sixth aspect of the present invention for solving the above-mentioned problems of the conventional example, in the wireless telephone system according to the second aspect, the Pch data processing means has the Pch frequency range and the Ach in the Pch overhead message. Means for determining whether or not the frequency ranges of both channels are equal from information indicating whether or not the frequency ranges are equal to each other, and if they are equal, determining the Pch channel as an Ach channel to be captured, the Ach capturing means comprising: Ac
It is characterized in that it is a means for capturing h.

[0020]

According to the present invention, the Pch channel is captured as the Ach channel when the frequency ranges are equal from the information indicating whether the Pch and Ach frequency ranges included in the Pch overhead message are equal. Since it is used as the access method of the wireless telephone system, the channel can be acquired quickly and surely.

According to the second and third aspects of the invention, Pch
The data processing means determines the Pch channel as the Ach channel that captures the Pch channel when the Pch and Ach frequency ranges are equal, and the home system identifier and Pch that the mobile unit has when the Pch and Ach frequency ranges are not equal. The system identifier of Ach is compared with the system identifier of Ach, and the Ach data processing means determines the Ach to be captured by comparing the system identifier of the home system with the system identifier of Ach when the identifier of the home system is equal to the identifier of the Pch.
Since the capturing means is the wireless telephone system and the access method for capturing the Ach determined by the Pch data processing means or the Ach data processing means, the channel can be captured quickly and surely, and the mobile unit can be A channel that matches the identifier of the home system that it has can be captured in the home area of the mobile unit.

According to the fourth and fifth aspects of the present invention, when the home system identifier of the mobile unit and the Pch identifier are not equal, the Ach data processing means:
3. The system attribute in the Pch overhead message is compared with the system attribute in the Ach overhead message, and if they are equal, the Ach is determined as an Ach to be captured, and the Ach capturing means captures the Ach. Since the wireless telephone system and its access method are used, Pch and Ac transmitted from another system, although not in the home area of the mobile unit,
h can be captured, and the range of channel capture can be expanded.

According to the sixth aspect of the invention, the Pch data processing means determines whether the frequency ranges of both channels are equal from the information indicating whether the frequency range of Pch in the overhead message of Pch is equal to the frequency range of Ach. It is determined whether or not it is determined, and if they are equal, the channel of Pch is determined as an Ach channel to be captured, and the Ach capturing means captures the Ach. Can be done.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 4, a wireless telephone system according to an exemplary embodiment of the present invention has a mobile unit that separates Pch (paging channel) from different systems in an area where adjacent cells of different systems overlap. It was devised in order to avoid the situation of capturing Ach (access channel). Incidentally, Pch and A
ch is transmitted from the base station 1 as described in FIG. 4, and the mobile unit 3 is an Ach corresponding to Pch.
Is designed to capture.

Next, a method of accessing the mobile unit 3 of the wireless telephone system of this embodiment will be described with reference to FIG. FIG. 1 is a functional configuration block diagram for realizing an access method of a mobile unit 3 of a wireless telephone system according to an embodiment of the present invention. The access method in the mobile unit 3 of the wireless telephone system according to the present embodiment includes a control channel (paging channel: Pch) capturing means 11 and a P channel.
ch data processing means 12 and access channel (Ac
h) It is composed of a scanning unit 13, an Ach selection unit 14, an Ach data processing unit 15, and an Ach acquisition unit 16.

As the data area used by each means, the first memory 20 for storing the overhead message received from Pch, the second memory 30 for storing the overhead message received from Ach, and the mobile unit 3 System identifier (S
Number assignment module (NAM) 40 for storing IDH) and Pch system identifier (SID)
And a SIDH of the mobile unit 3 match the storage result (referred to as ROAM in this embodiment) 4
2 and an Ach scan list area 43 for storing the Ach scan list.

Next, the function of each part will be specifically described. The first memory 20 is a memory that stores an overhead message received from Pch. Usually, the overhead message is a two-word message composed of word 1 containing a system identifier (SID) and word 2 having its attribute set for each wireless system.

The SID contained in the word 1 is a system identifier uniquely assigned to each radio telephone system and is 14-bit data. Also, in word 2,
Combine paging access information (CP indicating whether or not the frequency ranges of Pch and Ach are equal (common)
A) and information on the existence range of Ach corresponding to Pch (A
ch scanning range) and the like.

Here, CPA is the 17th bit of the word, and its value is CPA = 1 when the frequency range of Pch and Ach is common, and CPA = 0 when it is not common. Further, the information on the existence range of the Ach corresponding to the Pch is specifically designed to specify the scanning range of the Ach by combining a plurality of data items included in the word 2.

Similarly, the second memory 30 is a memory for storing the overhead message received from the Ach.

Next, the number assignment module (NAM) 40 pre-registers and stores the SID (SIDH) of the home system of the mobile unit 3.

The ROAM 42 reads the SID read from the overhead message received from the captured Pch.
And a SIDH stored in advance in the NAM 40 match the determination result. Where P
If the SID of the ch matches the SIDH, it means that the mobile unit 3 is currently located in the area of the home system (home area), and the Pch of the home system is
Indicates that you are in a controlled situation using.

The ROAM 42 is set in the Pch data processing means 12 to "0" if the Pch SID and SIDH match, and to "1" if they do not match. . Further, in the Ach data processing means 15, the method of discriminating whether or not the Ach is to be captured is discriminated from the value of the ROAM 42.

The Ach scan list area 43 is an area for storing the scan list of the channel (Ach) of the Ach corresponding to the Pch captured by the Pch capturing means 11.
The N channels having the strongest signal strength among the Ach scanned by the scanning means 13 are selected, and the channel numbers are stored in the order of the strongest signal strength.

Next, each processing means will be described. Pc
The h-acquisition means 11 is a process at the time of initialization and idle of the mobile unit 3, performs Pch scanning, acquires Pch having the maximum signal strength, receives an overhead message from the acquired Pch, and receives the first message. 20 is means for storing.

The Pch data processing means 12 receives the Pch received by the Pch acquisition means 11 and stored in the first memory 20.
Is a means for determining the content of the overhead message from and performing processing according to the content. Specifically, first, the CPA 20 in the word 2 stored in the first memory 20
Whether or not Ach scanning is performed is determined according to the value of c. That is, when the value of CPA20c is "1", Pc
Since the frequency ranges of h and Ach are common, the channel of Pch is determined as the channel of Ach to be captured without performing scanning of Ach at all. On the other hand, the value of CPA20c is "
In the case of 0 ″, since Pch and Ach are not common, processing for Ach scanning and Ach determination is performed.

Therefore, if the value of CPA 20c is "0", Ac
When scanning h, it is determined whether the mobile unit 3 is currently located in the home area, and the ROAM
The determination result is set in 42. Specifically, the data of the SID 20a in the first memory 20 is compared with the data of the SIDH previously stored in the NAM 40, and if they match, it is determined that the mobile unit 3 is located in the home area. ROAM42 is set to "0". On the other hand, SDI
If the data of 20a and SIDH do not match, ROA
"1" is set in M42.

Next, the Ach scanning means 13 is activated when the Pch data processing means 12 does not have a common frequency range for Pch and the Ach scanning means 13 is activated in the scanning range corresponding to the Pch captured by the Pch capturing means 11. This is a means for scanning all channels (Ach) and creating a scan list for Ach.

Specifically, the Ach in the first memory 20
All Achs are scanned based on the data of the scanning range 20d, N pieces are selected in descending order of signal strength, and stored in the Ach scan list area 43.

Next, the Ach selecting means 14 is means for sequentially selecting the Achs stored in the Ach scan list area 43, receiving the overhead message from the selected Achs, and storing it in the second memory 30.

Next, the Ach data processing means 15 causes the Ac
This is means for discriminating the content of the overhead message received from the Ach selected by the h selecting means 14 and stored in the second memory 30, and determining whether or not to capture the selected Ach according to the content.

Specifically, first, Pch data processing means 1
Based on the value of ROAM 42 set in 2, it is determined whether or not the mobile unit 3 is currently located in the home area. When the mobile unit 3 is located in the home area, SID3 of the overhead message received from Ach and stored in the second memory 30.
0a is compared with the SIDH stored in the NAM 40 in advance to determine whether or not the selected Ach is the home system channel of the mobile unit 3.

When the selected Ach is the home system channel of the mobile unit 3 (SID3
0a = SIDH) is an Ach that captures the selected Ach, and when the selected Ach is not the home system channel of the mobile unit 3 (SID30a ≠ S)
The IDH) returns to the Ach selecting means 14 without capturing and repeats the process for the next Ach.

On the other hand, when the mobile unit 3 is not located in the home area, the SID 30a of the overhead message received from the selected Ach and stored in the second memory 30 and the NAM 40 are stored in advance. Selected Ach by comparing with SIDH
Is the channel of the home system of the mobile unit 3.

When the selected Ach is the home system channel of the mobile unit 3 (SID3
0a = SIDH) is the SI of the Pch that has already been captured.
This means that D and the SID of the selected Ach are different, and the process returns to the Ach selection means 14 without capturing and the next A
The process for ch is repeated.

On the other hand, when the selected Ach is not the home system channel of the mobile unit 3, (SID ≠ S
IDH) compares Pch and Ac by comparing word 2 (20d) of the overhead message received from the captured Pch with word 2 (30d) of the overhead message received from the selected Ach.
It is determined whether or not h is a channel in the same area.

Then, the word 2 of Pch and the selected A
If the word 2 of ch matches, Pch and Ach are channels of another system although they are not home systems, so Ac that captures the selected Ach.
Determine as h. If the word 2 of Pch does not match the word 2 of the selected Ach, Pch and A
Ach because it is not the same system channel as ch
It returns to the selection means 14 and repeats the process about the next Ach.

Next, the Ach acquisition means 16 is the channel in the same frequency range as Pch when activated from the Pch data processing means 12, and the selected Ach when activated from the Ach data processing means 15. Is a means for capturing. As a result, the Ach paired with the Pch captured by the Pch capturing means 11 is captured, the channel capture is completed, and the mobile unit 3 becomes accessible.

Next, the access method of the wireless telephone system of this embodiment will be described with reference to FIGS. FIG. 2 is a flowchart showing the flow of processing of the access method of the mobile unit 3 of the wireless telephone system of this embodiment. As shown in FIG. 2, the process of the access method of the mobile unit 3 of the wireless telephone system according to the present embodiment is performed as Pch acquisition means 11 which is a process at initialization and idle time.
The ch is captured (100), the overhead message is received from the Pch (102), and the overhead message is stored in the first memory 20 (104).

Next, as a process for accessing from the mobile unit 3, first, as an operation of the Pch data processing means 12, the CP of the Pch overhead message is processed.
It is judged whether A20c = 1 (110), and CPA20c
In the case of = 1, since the frequency range of Pch and Ach is common, the Ach to be captured is set as a channel in the same frequency range as Pch (112), and the process 140 is skipped.
As the operation of the capturing means 16, an Ach capturing process is performed (1
40), the access processing ends.

On the other hand, in process 110, the CPA 20c
If ≠ 1 (= 0), SID2 in the first memory 20
0a and the SIDH of the NAM 40 match (120). If the SID 20a and SIDH match, the ROAM 42 is set to "0" (122), and the SDI
If 20a and SIDH do not match, ROAM42
Is set to "1" (124).

After the processing 122 or 124 is completed, Ach scanning and Ach determination processing are performed (13
0), then A for the Ach determined in process 130
A ch acquisition processing is performed by the operation of the ch acquisition means 16 (1
40), the access processing ends.

Next, the internal processing of the Ach scanning and Ach determination processing in the processing 130 of FIG. 2 will be described with reference to FIGS. 1 and 3. FIG. 3 is a flowchart showing the flow of processing within the Ach scanning and Ach determination processing.
In FIG. 3, the number of Achs stored in the Ach scan list area 43 is n (0 ≦ n ≦ N).

The internal processing of the Ach scanning and Ach determination processing which is the processing 130 of FIG. 2 is based on the Ach scanning range 20d of the first memory 20 as the operation of the Ach scanning means 13 as shown in FIG. All Achs are scanned (200), the scanned Achs are rearranged in order of strong signal strength (202), and Achs are rearranged in order of strong signal strength.
Then, N pieces are stored in the Ach scan list area 43 from the stronger one (204).

Next, as the operation of the Ach selection means 14,
First, 0 is assigned to i (210), and 1 is added to i (21
2), i is A stored in the Ach scan list area 43
It is judged whether it is larger than the number of channels (n) (21
4) If i is larger than n, it means that there is no Ach to be captured in the Ach stored in the Ach scan list area 43.
Processing 100 of.

On the other hand, if i is not larger than n in the process 214, the i-th Ach stored in the Ach scan list area 43 is selected and monitored (220), and it is judged whether an overhead message is received (222). ), When the overhead message is received, the overhead message is stored in the second memory 30 (22
4).

Next, as the operation of the Ach data processing means 15, first, it is judged whether or not the mobile unit 3 is located in the home area (that is, ROAM42 = 0) (230), and in the home area (ROAM = In case of 0), S of the overhead message received from Ach
The IDH 30a and the SIDH previously stored in the NAM 40
Is determined (232), the SID 30a and SI
If DH does not match, the processing returns to step 212 and the next Ac
When the process for h is performed and the SID 30a and SIDH match, the selected Ach is set as the Ach to be captured (234), and the Ach scanning and the Ach determination process are ended.

On the other hand, in process 230, the mobile unit 3 is not located in the home area (ROAM42 ≠).
In the case of 0), it is determined whether the SID 30a and SIDH of the Ach match (240). If the SID 30a and the SIDH match, the process returns to the process 212 and the process for the next Ach is performed, and the SID 30a and the SIDH do not match. Determines whether word 2 of the overhead message received from the captured Pch matches word 2 of the overhead message received from the selected Ach (242).

Then, the word 2 of Pch and the selected A
If the word 2 of ch does not match, the process returns to step 212 to perform the process for the next Ach, and word 2 of Pch.
And the word 2 of the selected Ach match, the process jumps to step 234, and after step 234, scanning of Ach and A
The ch determination process ends.

Further, in the process 222, the selected A
If you do not receive the overhead message from ch,
The timer is counted and it is judged whether or not a time-out has occurred (250). If the time-out has not timed out, the process returns to the process 222. If the time-out occurs, the process returns to the process 212 to select the next Ach and receive an overhead message. (Processing 212 to 222) is performed.

In the present embodiment, the mobile unit 3
When the connectable range of is limited to the home area, the processing 240 and the processing 242 are unnecessary. That is,
If ROAM42 ≠ 0 in process 230 and it is determined that the mobile device unit 3 is not located in the home area, the process directly returns to process 212 and the process for the next Ach is performed. However, when the mobile device unit 3 is not located in the home area, it is determined in step 230 that the mobile device unit 3 is not located in the home area for all Achs in the Ach scan list, and finally, From the processing 214, the access to the mobile unit 3 ends in failure, and the initialization and idle processing (processing 10 in FIG.
It will return to 0).

Therefore, when the connectable range of the mobile unit 3 is limited to the home area, the value of the ROAM 42 is discriminated before the process 130 of FIG. If it is determined that it is not located at, the process immediately returns to process 100.
A more efficient access service can be realized.

According to the radio telephone system and the control method thereof of this embodiment, when the frequency range of Pch is equal to the frequency range of Ach (when CPA = 1 in word 2 of the Pch overhead message), Since the Pch channel is captured as the Ach channel without scanning the Ach, there is an effect that the channel can be captured quickly when the frequency ranges of the Pch and the Ach are equal.

Further, according to the radio telephone system and the control method thereof of the present embodiment, when the Pch and Ach frequency ranges are equal, Ach scanning is not performed and channel acquisition is performed, so that Ach acquisition can be performed reliably. effective.

When the frequency ranges of Pch and Ach are not equal, first, the SIDH (SIDH of NAM 40) preset in the mobile unit 3 is compared with the SID of Pch in the Pch overhead message.
If SIDH and Pch SID are equal, SIDH and A
If the SID of Ach in the overhead message of ch is compared with the SID of Ach,
Since the Ach is captured, Pch based on SIDH
It is determined whether or not the SIDs of the Ach and Ach match, and the channel can be captured by the Ach corresponding to the Pch in the home area of the mobile unit 3 without supplementing the channels of other systems.

In addition, even if it is not the home area, Pc
word 2 of h (system attribute) and word 2 of Ach
(System attribute) is compared, and if it matches, the channel is captured, so if the Pch and Ach are sent from the same system in another system, it is not the home area. This has the effect of being able to capture and widening the range of channel capture.

[0067]

According to the first aspect of the invention, from the information indicating whether or not the frequency ranges of Pch and Ach included in the overhead message of Pch are equal, the channel of Pch is regarded as the channel of Ach when the frequency ranges are equal. Since the access method of the wireless telephone system for capturing is used, there is an effect that the channel can be captured quickly and surely.

According to the invention described in claims 2 and 3, Pch
The data processing means determines the Pch channel as the Ach channel that captures the Pch channel when the Pch and Ach frequency ranges are equal, and the home system identifier and Pch that the mobile unit has when the Pch and Ach frequency ranges are not equal. The system identifier of Ach is compared with the system identifier of Ach, and the Ach data processing means determines the Ach to be captured by comparing the system identifier of the home system with the system identifier of Ach when the identifier of the home system is equal to the identifier of the Pch.
Since the capturing means is the wireless telephone system and the access method for capturing the Ach determined by the Pch data processing means or the Ach data processing means, the channel can be captured quickly and surely, and the mobile unit can be The effect is that a channel that matches the identifier of the home system that it has can be captured in the home area of the mobile unit.

According to the fourth and fifth aspects of the present invention, when the home system identifier of the mobile unit and the Pch identifier are not equal, the Ach data processing means:
3. The system attribute in the Pch overhead message is compared with the system attribute in the Ach overhead message, and if they are equal, the Ach is determined as an Ach to be captured, and the Ach capturing means captures the Ach. Since the wireless telephone system and its access method are used, Pch and Ac transmitted from another system, although not in the home area of the mobile unit,
Therefore, h can be captured, and the range of channel capture can be expanded.

According to the sixth aspect of the present invention, the Pch data processing means determines whether the frequency ranges of both channels are equal from the information indicating whether the frequency range of Pch in the overhead message of Pch is equal to the frequency range of Ach. It is determined whether or not it is determined, and if they are equal, the channel of Pch is determined as an Ach channel to be captured, and the Ach capturing means captures the Ach. There is an effect that can be done.

[Brief description of drawings]

FIG. 1 is a functional configuration block diagram for realizing an access method of a mobile unit 3 of a wireless telephone system according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a processing flow of an access method of the mobile unit 3 of the wireless telephone system of this embodiment.

FIG. 3 is a flowchart showing the flow of processing within Ach scanning and Ach determination processing.

FIG. 4 is a schematic diagram of a conventional wireless telephone system.

FIG. 5 is a flowchart showing a processing flow of an access method of the mobile unit 3 of the conventional wireless telephone system.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Base station, 3 ... Mobile unit, 11 ... Pch acquisition means, 12 ... Pch data processing means, 13 ... Ac
h scanning means, 14 ... Ach selection means, 15 ... Ach
Data processing means, 16 ... Ach acquisition means, 20 ... First memory, 30 ... Second memory, 40 ... NAM,
42 ... ROAM, 43 ... Ach scan list area

Claims (6)

[Claims] 1. In an access method of a wireless telephone system in which a mobile unit captures a paging channel (Pch) and an access channel (Ach) sent from a base station, the Pch and the Ach included in an overhead message of the Pch. The mobile unit reads information indicating whether the frequency ranges of
An access method for a wireless telephone system, wherein the Pch channel is captured as an Ach channel when the ch frequency range is equal to the Ach frequency range. 2. A Pch capturing means for capturing Pch and storing an overhead message of Pch; and an Ach scanning means for scanning Ach and storing candidate Achs in a scan list in order from the highest signal strength. Ach selecting means for sequentially selecting an Ach from the scan list and storing an overhead message of the Ach, and Pch and A
It is determined whether or not the ch frequency ranges are equal, and if they are equal, it is determined as the Ach channel that captures the Pch channel, and if the Pch and Ach frequency ranges are not equal, the home system identifier of the mobile unit is used. Pch data processing means for comparing the Pch system identifier in the Pch overhead message, and the home system identifier and the Ach in the Ach overhead message when the home system identifier and the Pch identifier are equal. Ach that determines the channel of Ach to be captured by comparing with the system identifier
Ac for capturing the Ach determined by the data processing means and the Pch data processing means or the Ach data processing means
A radiotelephone system comprising: a capturing means. 3. A Pch capturing means captures Pch, and Pc
The overhead message of h is stored, the Ach scanning unit scans the Ach, the candidate Achs are stored in the scanning list in order from the highest signal strength, and the Ach selection unit selects the Ach in order from the scanning list. The overhead message of the Ach is stored, the Pch data processing means determines whether the frequency ranges of the Pch and the Ach are equal, and if they are equal, the channel of the Pch is captured A
If the channel range of Pch is not equal to the frequency range of Ach, the home system identifier of the mobile unit is compared with the Pch system identifier in the Pch overhead message, and the Ach data processing means Home system identifier and the Pc
If the identifiers of h are the same, the identifier of the home system is compared with the system identifier of Ach in the overhead message of Ach to determine the channel of Ach to be captured, and the Ach capturing means determines the Pch data processing means or the Ach. 3. The access method for a wireless telephone system according to claim 2, wherein the Ach determined by the data processing means is captured. 4. The Ach data processing means sets the system attribute in the Pch overhead message and the system attribute in the Ach overhead message when the home system identifier of the mobile unit and the Pch identifier are not equal. If they are equal by comparison, then Ac
By means of determining h as the channel of Ach that captures,
3. The wireless telephone system according to claim 2, wherein the Ach capturing means is means for capturing the determined Ach. 5. The Ach data processing means sets the system attribute in the Pch overhead message and the system attribute in the Ach overhead message when the home system identifier of the mobile unit and the Pch identifier are not equal. If they are equal by comparison, then Ac
5. The access method for the wireless telephone system according to claim 4, wherein h is determined as a channel of Ach to be captured, and Ach capturing means captures the determined Ach. 6. The Pch data processing means includes a Pch frequency range and an Ach in a Pch overhead message.
Means for determining whether or not the frequency ranges of both channels are equal from information indicating whether or not the frequency ranges are equal to each other, and if they are equal, determining the Pch channel as an Ach channel to be captured, the Ach capturing means comprising: 3. The wireless telephone system according to claim 2, wherein the wireless telephone system is a means for capturing the generated Ach.