KR100840366B1 - Method for simplifying preparatory access procedure between mobile station and base station - Google Patents

Abstract

According to the present invention, in an environment in which system settings are not frequently changed between a mobile terminal and a base station and sensitive to transmission latency such as a PTT service, an access message transmission preparation procedure may be omitted or the sequence number may be quickly determined to determine whether the mobile station and the base station are identical. A method of simplifying a procedure for preparing access message transmission between a wireless terminal and a base station for minimizing transmission delay between base stations, wherein the overhead message including system setting information and information for accessing the terminal to the system is not frequently changed. In an environment sensitive to transmission delay, the field about whether to omit an overhead message update procedure is added to a system parameter message to transmit an access message from a terminal to a base station regardless of the overhead message change.

PTT, access message, overhead message update, delay reduction, EV-DO, CDMA-1X

Description

{Method for simplifying preparatory access procedure between mobile station and base station}             

1 is a flowchart illustrating a process for preparing access message transmission according to the prior art;

2 is a diagram schematically illustrating a mobile communication network system to which the present invention is applied;

3 is a diagram illustrating a message format regarding an extended system parameter message (ESPM) or ANSI41-SPM according to the present invention;

4 is a diagram illustrating an example of a value of a length field illustrated in FIG. 3.

<Description of the symbols for the main parts of the drawings>

100: MS 110: BSS

120: PCF 130: PDSN

140: PTT server

According to the present invention, in an environment in which system settings are not frequently changed between a mobile terminal and a base station and sensitive to transmission latency such as a PTT service, an access message transmission preparation procedure may be omitted or the sequence number may be quickly determined to determine whether the mobile station and the base station are identical. A method of simplifying a procedure for preparing access message transmission between a wireless terminal and a base station for minimizing transmission delay between base stations.

The PTT service is an instant messenger service such as a kind of radio service. PTT service is a service that allows the subscriber to communicate immediately by pressing the switch of the terminal as the meaning of the word immediately, it can provide a relatively very fast communication service when compared to the standby time of a general mobile phone.

Such a PTT service network may be implemented using a CDMA2000 1x system or a CDMA2000 1x EV-DO system. When the PTT user wants to talk with the other party, the user selects the party to invite to the call and selects a call button or a service start button of the PTT terminal to generate an SIP-type invitation message. Transmit to PTT server through Access Network Controller (PCF), Packet Control Function (PCF), Packet Data Serving Node (PDSN). In this regard, the PTT server requests the called terminal to page to the base station system covering the subnet to which the base station located immediately before registering a location or entering a dormant state. The base station system performs paging through the base station belonging to the subnet according to the paging request for the invitation message from the PTT server.                         

Meanwhile, the CDMA2000 1X or the EV-DO performs a procedure of confirming whether the current configuration of the base station is identical to the configuration of the terminal, before the terminal transmits the access message.

More specifically, the monitoring process ensures that the last known paging channel (the control channel in the DO), access channel, and system settings are the same before both CDMA 1X or EV-DO actually send a call (access message). Will go through.

At this time, if there is a change in the set value, the value should be updated. If there is no change, the access message is sent immediately.

The above process will be described in detail with reference to the drawings.

1 is a flowchart illustrating a process for preparing access message transmission according to the prior art.

Referring to FIG. 1, in order to transmit an access message from a mobile station, it is necessary to check whether the current paging channel and system settings are the same as before (S10).

If it is determined that it is the same (S20), if it is determined that it is the same as the previous content, the setting is not changed, and thus, an access message is transmitted (S31). On the other hand, if it is determined that it is not the same as the previous content, the setting is changed. The head message must be updated (S32).

The overhead message at 1X is one of four messages sent by the base station to the terminal on the paging channel, which communicates information of the particular base station and the entire system with the mobile terminal. Paging channels are always fired from the base station and can be used up to seven within one frequency. It includes the final delivery of the call, the system's overhead message, call message, command message for the control of a specific mobile station, channel assignment message for allocation of a call channel and the like.

However, in 1X, when a base station issues a GPM (General Page Message) to set up an incoming call, the values of 'ACC_MSG_SEQ' and 'CONFIG_MSG_SEQ' and finally stored overhead messages 'ACC_MSG_SEQ' If the comparison is identical with 'CONFIG_MSG_SEQ', the procedure is omitted.

In addition, in case of receiving a message including 'ACC_MSG_SEQ' in outgoing call setup, for example, Empty GPM (GPM applied to all terminals, not specific terminals), Access Parameter Setting Message APM (Access Parameter Message), EAPM (Extended APM) If the value of 'ACC_MSG_SEQ' and finally stored 'ACC_MSG_SEQ' are identical, the procedure is terminated and the actual access message transmission procedure is entered. If the two values do not match, an overhead message update procedure must be performed. Since an empty GPM typically exits one paging cycle, an overhead update procedure can be performed within one paging cycle.

Meanwhile, the EV-DO performs an overhead message update procedure through a QuickConfig message transmitted to the control channel.

At this time, if the Signature values of 'AccessParameter' and 'SectorParameter' are the same as the finally stored values, the process proceeds to the access message transmission procedure. If the values are different, the procedure for receiving a new message and updating it should be performed.                         

In EV-DO, QuickConfig messages are transmitted in 256 slot periods, while SectorParameters and AccessParameters messages are sent in longer periods. Therefore, if the contents of the two messages are changed, the QuickSign message is reflected in the 256 slot period with the AccessSignature or SectorSignature changed value, while the actual changed messages (SectorParameters, AccessParameters) are received later. If the UE intends to transmit the access message at this time, the access should be suspended for a while until the SectorParameters or AccessParameters message changed by the mismatch is received.

An object of the present invention is to define a procedure that omits the overhead message update process that the CDMA2000 1X terminal passes before transmitting the access message, thereby improving the responsiveness in the case of services that are sensitive to latency The present invention provides a method for streamlining a procedure for transmitting an access message between users.

It is still another object of the present invention to provide a method for a UE to omit an overhead message update process in an access message transmission preparation procedure by transmitting a message to be changed when transmitting a message indicating whether to update an overhead message in an CDMA2000 EV-DO. To provide.

In order to achieve the above object, a method for simplifying an access message transmission preparation procedure between a wireless terminal and a base station according to an embodiment of the present invention may include an overhead message including system setting information and information for accessing a terminal to a system without changing the terminal and the system. In an environment sensitive to transmission delay between the terminals, transmitting an access message from the terminal to the base station regardless of the overhead message change.

A field for whether to omit an overhead message update procedure is added to a system parameter message so that an access message can be transmitted from a terminal to a base station regardless of the overhead message change.

The system parameter message is characterized by adding a field for setting a mode for each condition when a value in a field for whether to omit an overhead message update procedure is a value indicating that the overhead message update procedure for each condition is omitted.

The conditional mode field includes a mode for omitting an overhead message update procedure unconditionally every time an access message is transmitted, and a mode for omitting an overhead message update procedure only when an origination of a terminal is performed.

The terminal for simplifying the access message transmission procedure according to the present invention for achieving the above object, the overhead message including the system setting information and the information for accessing the terminal to the system is not frequently changed, the transmission delay between the terminal and the system In a sensitive environment, an access message is transmitted to a base station regardless of the overhead message change.

According to an aspect of the present invention, a method for streamlining an access message transmission preparation procedure between a wireless terminal and a base station according to the present invention informs whether configuration information of an EV-DO system and information for accessing a terminal to a system are changed. In the environment where the AccssSignature and SectorSignature in the QuickConfig message, which is an overhead message, do not change frequently and are sensitive to transmission delay between the terminal and the system, when the system parameter and the access parameter are substantially changed, the QuickConfig message, which is an overhead message, And transmitting from the base station to the terminal including the access parameter.

In the step of transmitting from the base station to the terminal including the system parameter and the access parameter in the QuickConfig, the AccessParameters and SectorParameters message that the Signature values of the QuickConfig and Signature values in the AccessParameters and SectorParameters is matched together.

In addition, a base station that simplifies an access message transmission preparation procedure according to the present invention for achieving the another object, the QuickConfig message which is an overhead message including the configuration information of the EV-DO system and information for the terminal to access the system; In an environment that is not changed frequently and sensitive to transmission delay between the terminal and the system, when the system parameter and the access parameter are substantially changed, the system includes the system parameter and the access parameter in QuickConfig, which is an overhead message, and transmits them to the terminal. do.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention.

2 is a diagram schematically illustrating a mobile communication network system to which the present invention is applied.

Here, the mobile communication network system to which the present invention is applied may be a CDMA2000 1x system or a CDMA2000 1x EV-DO system.

2, a mobile communication network system includes a mobile station 100 (hereinafter referred to as "MS") 100, a base station system (hereinafter referred to as "BSS"), and in the DO, an access network controller, It includes a 'ANC' 110, a packet control function (PCF) 120, a packet data serving node (PDSN) 130, a PTT server 140.

The MS 100 and the BSS 110 are connected by a wireless link, and the BSS 110 (ANC in the case of DO), the PCF 120 and the PDSN 130 are connected by a wired network. The PDSN 130 is interworked with the PTT server 140 and the Internet Protocol (IP) network.

Here, the network including the BSS 110 or the ANC, the PCF 120, and the PDSN 130 is also called an access network in the sense of enabling the MS 100 to access the IP network. Since the PDSN 130 receives the packet signal from the PCF 120 and transmits the packet signal to the Internet or an external / internal network as an IP signal, the PDSN 130 interworks with two networks of different types at the boundary between the IP network and the access network.

In the access state, the MS 100 includes the call invitation message for the other party according to the subscriber's selection and the address information of the called party's destination terminal in the DBM (Data Burst Message) (DOS (DataOverSignaling in the DO)). Call to BSS 110 (ANC in DO) through an outgoing call message for establishing a traffic channel or a call invitation message for an arbitrary party according to the subscriber's state and the address information of the called party's called terminal in an access state. It is included in the Origination Reconnect Message (ConnectionRequest in the DO) and transmitted to the BSS 110 (ANC in the DO) through the radio section.

Hereinafter, a method for omitting an overhead message update procedure for preparing access message transmission from a terminal to a base station on the basis of 1X will be described.

When the terminal transmits the access message, the network operator determines whether the paging channel and system settings are the same as the previous contents and whether to perform the overhead message update procedure regardless of whether or not the overhead message update procedure is omitted. Can be specified as needed.

First, it will be described whether the overhead message is updated when the terminal makes a call to the base station.

In the case of CDMA 1X, as shown in FIG. 3, a value for whether to omit an overhead message update procedure is added to an ESPM or ANSI-41 system parameter to notify the UE.

3 is a diagram illustrating a message format regarding an extended system parameter message (ESPM) or ANSI41-SPM according to the present invention.

3, SOVHDU_SUPPORTED and SOVHDU_MODE fields are added.

Here, "[..]" is for an existing field, and the description thereof is omitted.

The SOVHDU_SUPPORTED field and the SOVHDU_MODE field are defined as shown in Table 1.

SOVHDU_SUPPORTED: Skipping Overhead Update Sub state supporting indicator If SOVHDU_SUPPORTED is set to '1', the mobile station is permitted to skip the overhead update substate and otherwise, it shall perform normal access procedures. SOVHDU_MODE: SOVHD mode If SOVHDU_SUPPORTED is set to '0', the base station shall omit this field, otherwise, the base station shall set one value among listed at the below table.

Referring to the description of Table 1, the SOVHDU_MODE field may be recorded as a value other than '0', that is, a value of 1,2 as shown in FIG. 4.

4 is a diagram illustrating an example of a value of a length field illustrated in FIG. 3.

Referring to FIG. 4, when set to 1, whenever an access message is sent, an overhead message update process is skipped (omitted).

If set to 2, it means to skip the overhead message update process only when initialized according to the origination indication.

If the value is set to '2', the access time can be reduced by simplifying the procedure of updating the overhead message during the incoming call of 1X or the DO proposed in the next section. This setting is to omit the message update procedure.

In addition, in case of CDMA 1X, a PTT call may be designated as an emergency call when obtaining a P value related to PD (Persistence Delay) in a process of transmitting a terminal, thereby reducing a PD value and reducing an access message transmission time.                     

If necessary, in case of sending a response message for an incoming call, the same applies to the set P value '1' in this case, so that the terminal can freely set it when 'SOVHDU_SUPPORTED' is '1'. In the case of DO, the class for PTT service is specified and the Persistence value for the class is adjusted in AccessParameter so that the PD preparation time, which is the basic preparation time when transmitting an access message, can be reduced.

If the overhead message update procedure is omitted in 1X, when the access instantaneous base station setting value is changed, the base station may not receive the access message. Also, depending on the adjustment of the PD value, the possibility of access collision may change. For the operator to change the base station setting value for this, the access collision probability value according to the PD value should be obtained through simulation and the like, and the appropriate setting value should be found accordingly.

Hereinafter, a case in which packet incoming call setting that does not matter greatly whether overhead message is updated or contents are transmitted to the terminal will be described.

In case of UE, in case of using CDMA 1X system, when base station issues GPM (General Page Message), 'ACC_MSG_SEQ' and 'CONFIG_MSG_SEQ' values and GV (SEC) stored in GPM and overhead message When the 'ACC_MSG_SEQ' and 'CONFIG_MSG_SEQ' are the same, the method of omitting the overhead message update procedure is already presented.

In this context, even when using the EV-DO system, when the terminal transmits an access message, the AccessSignature and SectorSignature of the AccessParameters and SectorParameters messages that the terminal finally received have the same value as the AccessSignature and SectorSignautre values of the QuickConfig. Make the process run right away. Unlike 1X, since EV-DO is a time division multiplexing (TDM) scheme, overhead messages are not transmitted except for a period in which a control channel is transmitted. Therefore, the period in which the QuickConfig message is transmitted to inform the base station that the setting value is changed in the forward / reverse direction or the base station and the period in which the changed setting value is actually applied in the base station should be applied in accordance with the period of the control channel.

When the terminal posts an access message regardless of origination / reception, the terminal determines whether to perform an overhead update procedure based on the last received QuickConfig, AccessParameters, and SectorParamters. If the access message is to be transmitted between the middle of the control channel, if the AccessSignature and the SectorSignature of the final messages are the same, the access message transmission procedure is immediately assumed on the assumption that the setting is maintained until the next control channel is down. As far as possible, the system should perform the base station configuration and update the values of the signatures in the QuickConfig message according to the period of the control channel even if an event occurs during the control channel.

However, a problem occurs when the Signature value in QuickConfig is changed to indicate that a new setting has been made.

In other words, when the base station changes the set value, the EV-DO may need to update the SectorParameters message or the AccessParameters message when the access message is transmitted. However, since the SectorParameters or AccessParameters message transmission period is a multiple of 256 slots of the paging period of the control channel, an average of 128 slots or more is required. In particular, the longer the transmission period of the preceding two messages, the longer the access message transmission delay occurs. In order to solve this problem, in the present invention, there is a change history separately from the AccessParameters or SectorParameters that the base station makes at regular intervals so that the new Signature values of the changed two or two messages are all together when QuickConfig contains the changed contents. This solves the problem of slow transmission because the Signature values in QuickConfig and the Signature values in AccessParameters and SectorParameters are always the same.

That is, even if the transmission interval of AccessParameters and SectorParameters is longer than QuickConfig, if there is a change in value, AccessParameters and SectorParameters can be sent together when sending QuickConfig so that the user can be notified immediately of the changed contents regardless of the transmission period of the original AccessParameters and SectorParameters. .

In addition, the base station should operate to change the setting value according to the cycle of the control channel. If a problem occurs and SectorParameters or AccessParameters containing the changed contents cannot be lowered, the base station reflects the change in QuickConfig and changes the internal setting of the base station to the next control channel cycle. Be able to postpone

While the above has been described in detail with respect to preferred embodiments of the present invention, those skilled in the art to which the present invention pertains, various modifications can be made without departing from the spirit and scope of the invention as defined in the appended claims. It will be appreciated that modifications or variations may be made. Therefore, changes in the future embodiments of the present invention will not be able to escape the technology of the present invention.

As described above, in the CDMA 1X and the EV-DO system, the overhead message update procedure may be omitted by the UE before the UE forcibly transmits the access message, thereby reducing the access time.

In addition, EV-DO drops the changed contents immediately in a message indicating whether there has been any change, regardless of the original period, so that the overhead message changes are always reflected on access, and the delay time for updating the changes on access. There is an effect that can prevent.

Claims (12)

In an environment in which an overhead message including system setting information and information for accessing a terminal to a system is not frequently changed and sensitive to transmission delay between the terminal and the system, Receiving a system parameter message appended with data bits including information on whether the overhead message update procedure is omitted; With reference to the data bits included in the received system parameter message, if the value of the data bit is defined to omit the update procedure irrespective of the overhead message change, the direct access message is transmitted without the overhead message change monitoring process. A method for simplifying a procedure for preparing to transmit an access message between a wireless terminal and a base station comprising the steps of: delete The method of claim 1, The system parameter message is An access message between a wireless terminal and a base station, wherein a data bit for setting a mode for each condition is added when a value in the data bit for whether the overhead message update procedure is omitted is a value indicating that the overhead message update procedure for each condition is omitted. How to simplify the process of preparing to send. The method of claim 3, wherein The conditional mode is A mode for omitting an overhead message update procedure unconditionally every time an access message is sent; And a mode for omitting an overhead message update procedure only when the terminal is originating. In an environment in which an overhead message including system setting information and information for accessing a terminal to a system is not frequently changed and sensitive to transmission delay between the terminal and the system, Receive a system parameter message to which data bits including information on whether the overhead message update procedure is omitted are added, and referring to the data bits, the value of the data bit is updated regardless of the overhead message change. If it is a value defined to omit, the terminal simplifies the procedure for transmitting an access message, characterized in that the direct access message is transmitted without an overhead message change monitoring process. delete The method of claim 5, The system parameter message is When the value of the data bit for whether to omit the overhead message update procedure is a value indicating the omission of the overhead message update procedure for each condition, a data bit for setting a mode for each condition is added. Terminal. The method of claim 7, wherein The conditional mode is A mode for omitting an overhead message update procedure unconditionally every time an access message is sent; And a mode for omitting an overhead message update procedure only when the terminal is originating from the terminal. In an environment in which an overhead message including configuration information of an EV-DO (Evolution Data Only) system and information for connecting a terminal to the system is not frequently changed, and sensitive to transmission delay between the terminal and the system, Determining whether there is a change in system parameters and access parameters; If there is a change in the parameter, adding the changed system parameter and the access parameter to the QuickConfig message used to perform the update procedure of the overhead message, and transmitting from the base station to the terminal ready to transmit the access message between the base station and the base station How to simplify the procedure. The method of claim 9, wherein the transmitting of the QuickConfig message comprises: Retrieving AccessParameters and SectorParameters having a Signature value that matches a Signature value in the QuickConfig message; And adding the retrieved AccessParameters and SectorParameters to the QuickConfig message and transmitting them from the base station to the terminal. In an environment in which an overhead message including configuration information of an EV-DO (Evolution Data Only) system and information for connecting a terminal to the system is not frequently changed, and sensitive to transmission delay between the terminal and the system, It is determined whether there is a change of a system parameter and an access parameter, and when the parameter is changed, the changed system parameter and the access parameter are added to the QuickConfig message used to perform the update procedure of the overhead message and transmitted to the terminal. A base station that simplifies the preparation of access message transmission. The method of claim 11, wherein the changed system parameter and access parameter are added to the QuickConfig message and transmitted to the terminal. Preparing for transmission of an access message between a wireless terminal and a base station by searching for AccessParameters and SectorParameters having a Signature value that matches a Signature value in the QuickConfig message, and transmitting the retrieved AccessParameters and SectorParameters to the UE in addition to the QuickConfig message. Base station to simplify the procedure.

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