KR101084112B1 - How to create a public long code mask in a mobile communication system - Google Patents

Abstract

A method of generating a public long code mask in a mobile communication system is proposed. Select one of the pseudo electronic serial number, the international mobile subscriber identifier, the mobile device identifier, and the value assigned by the base station according to the communication environment as a factor for generating a public long code mask for a reverse supplemental code channel (R-SCCH). The public long code mask is then generated using this selected argument. Therefore, when the mobile device identifier is used instead of the electronic serial number as a separator for identifying a terminal, a public long code mask of a reverse supplemental code channel (R-SCCH) may be generated so that a collision with another traffic channel of the corresponding terminal does not occur. In addition, the CDMA 2000 system in which the mobile device identifier is used can support the reverse supplemental code channel (R-SCCH).

Traffic channel, public long code mask, electronic serial number

Description

Method of Generating A Public Long Code Mask at a Mobile Communication System}

1 is a diagram showing a method of generating a long code.

2 is a diagram illustrating a public long code mask format used for a reverse traffic channel.

3 is a diagram showing the structure of an electronic serial number (ESN).

4 is a diagram illustrating a structure of a mobile device identifier (MEID).

FIG. 5 is a diagram illustrating a public long code mask format of an R-SCCH using pseudo-ESN.

6 is a diagram illustrating a public long code mask format of an R-SCCH using IMSI_M.

7 is a diagram illustrating a public long code mask format of an R-SCCH using IMSI_T.

8 is a diagram illustrating a public long code mask format of an R-SCCH using a MEID.

9 is a diagram illustrating a public long code mask format of the R-SCCH using the value (PLCM_36) assigned by the base station.                 

FIG. 10 is a flowchart illustrating an example of selecting a factor for generating a public long code mask according to whether the terminal is in a roaming state or not.

The present invention relates to a method for generating a public long code mask in a mobile communication system and transmitting and receiving data using the generated public long code mask.

In a Cdma 2000 system, long codes are used to encrypt the channel in the forward channel and to locate the power control bits. In addition, the long code serves to distinguish each terminal in the reverse channel and serves to reduce interference with other subscriber stations.

The long code consists of 42 bits. FIG. 1 is a diagram showing a method of generating the long code.

As shown in FIG. 1, a long code is generated according to a 42-bit long code mask. The generated long code performs the above role by being a modulo-2 inner product with a transmission signal.

The long code mask is generated differently for each channel. FIG. 2 is a diagram illustrating a public long code mask format used for a reverse traffic channel. The Reverse Supplemental Code Channel (R-SCCH), which is one of the reverse traffic channels, is used in IS-95-B to support a high speed packet data service called a medium data rate (MDR). Up to seven channels can be used.

More specifically, FIG. 2 shows a reverse fundamental channel (hereinafter referred to as R-FCH: Reverse Fundamental Channel) and a radio supplemental code channel (hereinafter referred to as R-SCCH: Reverse Supplemental). Public long code mask format for Code Channel).

As shown in FIG. 2, the public long code mask format includes a 3-bit code channel index and a 37-bit PLCM_37. In case of R-FCH, it is set to '000', and in case of R-SCCH, it is set to a value between '001' and '111' according to the assigned code channel (i). That is, the code channel i is set to '001' if 1, '010' if 2, and '111' if 7.

The PLCM_37 (M36 to M0) may be further divided into M36 to M32 and PLCM_32 (M31 to M0).

The base station should inform the terminal how to generate the PLCM_32 through an Extended Channel Assignment Message (hereinafter referred to as ECAM).

If the 4-bit PLCM_TYPE in the ECAM is '0000', M36 to M32 are set to '11000', and the PLCM_32 is an electronic serial number (hereinafter referred to as ESN: Electronic Serial Number) permutation as follows. (permutation) to create.

That is, if ESN = {E31, E30, E29,, E2, E1, E0},

PLCM_32 = (E0, E31, E22, E13, E4, E26, E17, E8, E30, E21, E12, E3, E25, E16, E7, E29, E20, E11, E2, E24, E15, E6, E28, E19 , E10, E1, E23, E14, E5, E27, E18, and E9}.

If the 4-bit PLCM_TYPE in the ECAM is '0001', M36 to M32 are set to '11011' and the PLCM_32 is set to the value of 32-bit PLCM_32r in the ECAM. The ESN is a unique identifier assigned to a terminal in the cdma 2000 system and is used for call processing.

3 is a diagram showing the structure of an ESN.

As shown in FIG. 3, the ESN is composed of 32 bits. The most significant bit (MSB: 8 bits) is assigned a manufacturer's code (MFC), and the least significant bit (LSB) is 24 bits. The manufacturer's terminal serial number is assigned. The manufacturer number is assigned to each manufacturer and is uniquely set. If the number of terminals of the manufacturer exceeds the allocated serial number (SN), a new manufacturer number is assigned.

However, as the production of terminals increases, the ESN composed of 32 bits is expected to be exhausted in the future. Thus, a new delimiter for distinguishing terminals is made in place of the ESN, which is used from IS-2000 Revision D as a mobile equipment identifier (MEID).

As described above in the Cdma 2000 system, when the mobile device identifier (MEID) is used instead of the electronic serial number (ESN) as a delimiter for distinguishing the terminal, the public long by using the electronic serial number (ESN). The existing method of generating a code mask should be modified, and in particular, in case of a reverse supplemental code channel (R-SCCH), when creating a public long code mask, consideration should be given to avoid collision with other traffic channels of the terminal. No specific production method has been proposed yet.

An object of the present invention is a method of generating a public long code mask in a mobile communication system in case of using a mobile device identifier (MEID) instead of an electronic serial number (ESN) as a delimiter for identifying a terminal and the public long code mask. It provides a method for transmitting and receiving data using the.

Another object of the present invention is to use a mobile device identifier (MEID) instead of an electronic serial number (ESN) as a delimiter to distinguish a terminal, the public long code mask for the reverse auxiliary code channel (R-SCCH) of the corresponding terminal The present invention provides a method for generating a public long code mask to prevent a collision with another traffic channel.

In order to achieve the above object, in the present invention, in order to prevent a public long code mask of a reverse supplemental code channel (R-SCCH) from colliding with another traffic channel of the corresponding terminal, the public long code mask is generated according to a communication environment. Select the argument used.

According to one aspect of the present invention, a method for generating a public long code mask in a mobile communication system is a factor for generating a public long code mask for a reverse auxiliary code channel (R-SCCH), which is a pseudo electronic serial number according to a communication environment. Select one of the values assigned by the MS, the international mobile subscriber identifier, the mobile device identifier, and the base station.

According to another aspect of the present invention, a method for generating a public long code mask and transmitting data using the same in a mobile communication system is a factor for generating a public long code mask for a reverse auxiliary code channel (R-SCCH). Selecting one of a pseudo electronic serial number, an international mobile subscriber identifier, a mobile device identifier, and a value assigned by a base station according to a communication environment, and using the selected factor, the public long code mask and the corresponding public long code Generating and combining the generated public long code with a transmission signal and transmitting the received signal toward the receiving side.

According to another aspect of the present invention, a method for generating a public long code mask and receiving data using the same in a mobile communication system includes: a factor for generating a public long code mask for a reverse auxiliary code channel (R-SCCH) Selecting one of a pseudo-electronic serial number, an international mobile subscriber identifier, a mobile device identifier, and a value assigned by a base station according to a communication environment, and using the selected factor as the public long code mask and the corresponding public. Generating a long code, combining the generated public long code with the received signal, and then decoding it.

Advantageously, the determination of the communication environment includes a determination as to whether the mobile communication system is in a roaming state or not in a roaming state.

Preferably, the determination of the communication environment includes a determination as to whether the base station supports the mobile device identifier (MEID) when the mobile communication system uses the mobile device identifier (MEID).

Other objects, features and advantages of the invention will become apparent from the following detailed description of embodiments taken in conjunction with the accompanying drawings.

Hereinafter, with reference to the accompanying drawings illustrating the configuration and operation of the embodiment of the present invention, the configuration and operation of the present invention shown in the drawings and described by it will be described by at least one embodiment, By the technical spirit of the present invention described above and its core configuration and operation is not limited.

Hereinafter, with reference to the accompanying Figures 4 to 10 will be described in detail a preferred embodiment of the present invention.

4 is a diagram showing the structure of a mobile device identifier (hereinafter referred to as MEID).

As shown in FIG. 4, the MEID is composed of 56 bits, and the MFC is allocated to the most significant bit (hereinafter, referred to as MSB: most significant bit), and the least significant bit (hereinafter, referred to as LSB: least significant bit). 24 bits are assigned the terminal serial number of the manufacturer.

As described above, when the MEID is used without using the ESN as a delimiter for distinguishing the terminal, as described above, a public long code mask (hereinafter, referred to as a PLCM: Public Long Code Mask) is used using the ESN. You must modify the existing method of creating).

In an embodiment of the present invention, a factor required for generating the public long code mask is selected according to a communication environment. A method of generating the public long code mask according to the selected factor will be described in detail below.

As a factor for generating a public long code mask for a reverse supplemental code channel (R-SCCH), one of a pseudo electronic serial number, an international mobile subscriber identifier, a mobile device identifier, and a value assigned by a base station is selected according to a communication environment. do.

First, a method of generating the public long code mask by the pseudo electronic serial number (hereinafter referred to as pseudo-ESN) will be described.

This method may be used when a terminal using the MEID receives a service from a base station that does not support the MEID. In this case, the terminal maps the MEID to generate a 32-bit pseudo-ESN. The pseudo-ESN is used to generate a public long code mask of the traffic channel (R-SCCH in this embodiment).                     

5 is a diagram illustrating a public long code mask format of R-SCCH using the pseudo-ESN.

In the public long code mask of FIG. 5, the most significant 2 bits are set to '11', and the next lower 3 bits are code channel index value (CCI: '001') to prevent collision with other traffic channels. ~ '111'), the next lower 5 bits are set to '11000', and the last least significant 32 bits are set to the result of permutating the pseudo-ESN.

Next, a method of generating a public long code mask using an international mobile subscriber identifier (IMSI) will be described. This method is divided into a method using IMSI_M and a method using IMSI_T.

First, when the international mobile subscriber identifier (hereinafter referred to as IMSI: International Mobile Subscriber Identity) that is actually used is determined from IMSI_M generated from a mobile identification number (hereinafter referred to as MIN: Mobile Identification Number) indicating a telephone number. Next, a public long code mask of the R-SCCH is generated using the IMSI_M.

6 is a diagram illustrating a public long code mask format of the R-SCCH using the IMSI_M.

In the public long code mask format of FIG. 6, a code channel index value (CCI: '001) is set so that the most significant two bits are set to' 11 'and the next lower three bits prevent collision with another traffic channel. 'To' 111 '), and the next lower 3 bits are set to' 001 'to prevent collision with a public long code mask generated using the pseudo-ESN or the true international mobile subscriber identifier (IMSI_T). And the remaining least significant 34 bits are set to an operating international mobile subscriber identifier (IMSI_O_S) extracted from the IMSI_M_S generated by the IMSI_M.

First, when the international mobile subscriber identifier (hereinafter referred to as IMSI: International Mobile Subscriber Identity) actually used is determined from an IMSI_T generated regardless of a mobile identification number (MIN) indicating a telephone number, the public of the R-SCCH A long code mask is generated using the IMSI_T.

7 is a diagram illustrating a public long code mask format of the R-SCCH using the IMSI_T.

In the public long code mask format of FIG. 7, a code channel index value (CCI: '001) is set so that the most significant two bits are set to' 11 'and the next lower three bits prevent collision with other traffic channels. 'To' 111 '), and the next lower 3 bits are used to prevent collision with the public long code mask generated using the international mobile subscriber identifier (IMSI_M) using the pseudo-ESN or the telephone number. 000 ', and the least significant 34 bits remaining are set to the operating international mobile subscriber identifier (IMSI_O_S) extracted from the IMSI_T_S generated by the IMSI_T.

Next, a method of generating a public long code mask of the R-SCCH using the MEID will be described.

In this method, a 36-bit value is generated by mapping the MEID consisting of 56 bits, and the value mapped from the MEID is used to generate a public long code mask of the R-SCCH.

8 is a diagram illustrating a public long code mask format of the R-SCCH using the MEID.

As shown in FIG. 8, the public long code mask format of the R-SCCH has the most significant two bits set to '10', and the next three bits have a code channel index value to prevent collision with other traffic channels. index value) (CCI: '001' to '111'), and the next lower 1 bit is set to '0' to prevent collision with a public long code mask generated using a value directly assigned by the base station. And the next lowest 36 bits are set to the value mapped from the MEID.

Next, a method of generating a public long code mask of the R-SCCH using the value PLCM_36 assigned by the base station will be described.

In this method, the base station uses an extended channel assignment message (ECAM) or universal handoff with a 36-bit value (PLCM_36) to be used for each terminal so that the public long code masks of the terminals do not collide with each other. The allocation is performed through a universal handoff direction message (UHDM) and the allocated value PLCM_36 is used to generate a public long code mask of the R-SCCH.

9 is a diagram illustrating a public long code mask format of the R-SCCH using the value PLCM_36 assigned by the base station.                     

As shown in FIG. 9, the format of the public long code mask is that the most significant 2 bits are set to '10', and the next lower 3 bits are code channel index values to prevent collision with other traffic channels. (CCI: '001' to '111'), and the next lower 1 bit is set to '1' to prevent collision with a public long code mask generated using the MEID, and finally the lowest 36 bits. Is set to a value (PLCM_36) assigned by the base station.

10 is a flowchart illustrating an example of selecting the factor for generating a public long code mask differently depending on whether the terminal is in a roaming state or not.

As shown in Fig. 10, it is determined whether the terminal is currently in a roaming state, and when the roaming state is selected, the pseudo-ESN is selected as the factor, and if it is not in the roaming state, the IMSI is selected as the factor. If the terminal is not in the roaming state and uses the IMSI, it is again determined whether the IMSI_O of the terminal is generated from the IMSI_M or the IMSI_T, and if the terminal is generated from the IMSI_M, select the IMSI_M as the factor, and Once generated from IMSI_T, the IMSI_T is selected as the factor.

As mentioned above, a factor for generating a public long code mask for a reverse supplemental code channel (R-SCCH), a pseudo electronic serial number, an international mobile subscriber identifier, a mobile device identifier and a value assigned by a base station according to a communication environment. Which one is selected.                     

Here, in consideration of the transmitting side, the public long code mask and the corresponding public long code are generated using the selected factor and the generated public long code is combined with the transmission signal as described above and then transmitted toward the receiving side. do. Here, the generated public long code is a modulo-2 inner product with the transmission signal as described above.

Here, in consideration of the receiving side, the public long code mask and the corresponding public long code are generated using the selected factor and the generated public long code is combined with the received signal and then decoded. Here, the generated public long code is equally modulo-2 inner product with the received signal.

As described above, according to the present invention, when the MEID is used instead of the ESN as a separator for identifying the terminal, a public long code mask of the R-SCCH can be generated so that collision with another traffic channel of the corresponding terminal does not occur. Furthermore, the cdma 2000 system using the MEID can support the R-SCCH.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims.

Claims (23)

A method for generating a public long code mask for a reverse traffic channel in a mobile communication system, International Mobile Subscriber Identity (IMSI) generated from a mobile identification number representing a telephone number according to a preset rule, a mobile device identifier, and a pseudo-electronic serial number (Pseudo- generated by mapping the mobile device identifier). Selecting one of an ESN) and a value assigned by the base station to prevent collision of the public long code mask of the terminal; And And generating a public long code mask using a code channel index value distinguished from the selected one and the other traffic channels. The method of claim 1, And wherein the reverse traffic channel is a reverse supplemental code channel (RCCH). The method of claim 1, The pseudo electronic serial number is selected when a terminal using the mobile device identifier (MEID) receives a service from a base station that does not support the mobile device identifier (MEID) according to the preset rule. How to create a long code mask. The method of claim 3, wherein The public long code mask format generated using the pseudo-ESN includes the most significant 2 bits set to '11' and 5 bits set to '11000', and the code channel index value (code channel) index value) is set to 3 bits and the pseudo electronic serial number is set to 32 bits. delete The method of claim 1, The public long code mask format generated from the mobile identification number includes the most significant two bits set to '11' and three bits set to '001', wherein the code channel index value is set to three bits and the international mobile subscriber identifier The public long code mask generation method, characterized in that is set to 34 bits. The method of claim 1, When the International Mobile Subscriber Identifier (IMSI) is selected according to the preset rule, the International Mobile Subscriber Identifier is a true International Mobile Subscriber Identifier (True IMSI) generated regardless of a mobile identification number (MIN) representing a telephone number. IMSI_T) public long code mask generation method characterized in that. The method of claim 7, wherein The public long code mask format generated using the true international mobile subscriber identifier (IMSI_T) includes the most significant two bits set to '11' and three bits set to '000', and the code channel index value is set to three bits. And the international mobile subscriber identifier generated using the true international mobile subscriber identifier (IMSI_T) is set to 34 bits. The method of claim 1, When the mobile device identifier (MEID) is selected according to the preset rule, the public long code mask format generated by using the mobile device identifier is the highest 2 bits set to '10' and the lower 1 set to '1'. And 36 bits mapped from the mobile device identifier, wherein the code channel index value is set to 3 bits. The method of claim 9, And the 36 bits are mapped from the mobile device identifier (MEID) consisting of 56 bits. The method of claim 1, When the value assigned by the base station is selected according to the preset rule, the public long code mask generation method is generated using the 36-bit value PLCM_36 provided from the base station. . The method of claim 11, The public long code mask format generated using the value assigned by the base station (PLCM_36) is 36 bits corresponding to the highest 2 bits set to '10', the lower 1 bit set to '1' and the value allocated by the base station. And a bit, wherein the code channel index value is 3 bits. The method of claim 11, And a value assigned by the base station is transmitted through one of an extended channel allocation message (ECAM) and a universal handoff direction message (UHDM). The method of claim 1, The selecting step further includes determining whether the terminal is currently in a roaming state. Selecting the pseudo-ESN if the terminal is currently in a roaming state, and selecting the international mobile subscriber identifier (IMSI) if the terminal is not in a roaming state; How to generate code masks. The method of claim 14, When the international mobile subscriber identifier (IMSI) is selected, if the operating international mobile subscriber identifier (IMSI_O) is generated from an international mobile subscriber identifier (IMSI_M) using a telephone number, the public long code mask is generated using the IMSI_M, If the operating international mobile subscriber identifier (IMSI_O) is generated from a true international mobile subscriber identifier (IMSI_T) generated irrespective of a mobile identification number (MIN) representing a telephone number, the mobile terminal uses the true international mobile subscriber identifier (IMSI_T) to generate the information. A public long code mask generation method, characterized in that for generating a public long code mask. The method of claim 1, Generating a public long code corresponding to the generated public long code mask; And And transmitting the generated public long code in combination with a signal to be transmitted. delete delete delete delete delete delete The method of claim 16, The generated public long code is a method for generating a public long code mask, characterized in that the modulo-2 inner product (modulo-2 inner product) and the signal to be transmitted.

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