CN1429034A - Method for implementing signaling system in wireless local telephone system - Google Patents

Abstract

A method for realizing the signaling system in a wireless local telephone system, using a point-to-point direct connection between the GSM and the RPCU in the PHS to form an interface A', modifying the calling, called, location update, and handover procedures in between to maintain PS The standard STD28 protocol between CS and CS remains unchanged. Among them, the calling procedure includes the mobile phone initiating a call, authentication, listening to the ringback tone, and the called party picks up the phone, and the called party procedure includes paging the called party, authentication, and the called party’s ringing 1. The called party picks up the phone. The location update includes the mobile phone initiating location update, authentication, and location update. The handover procedure includes initiating handover, removing the old RCPU session, and connecting the new RCPU session. The present invention introduces GSM to provide mobility management functions, absorbs PS, CS and other systems that have been applied on a large scale through the interface PHS system, and uses the signaling system provided by the present invention to ensure the efficient operation of the interface process between RPCU and GSM. And maximize compatibility with existing systems and equipment.

Description

A Realization Method of Signaling System in Wireless Local Phone System

technical field

The present invention relates to a wireless local telephone system, more specifically, to a method for realizing a signaling interface between a service providing side and a wireless access side in the wireless local telephone system.

Background technique

GSM (Global System for Mobile Communications) has been widely used all over the world. The base stations of the cellular network in the GSM system are generally large and expensive, with a height of tens of meters and a service area radius of tens of kilometers. The voice quality is generally very low, and the transmission rate is between 8 kbit/s and 13 kbit/s. At the same time, the traditional cellular network communication is also limited by the amount of traffic that can be carried. When the number of users increases, the system becomes very crowded. For this reason, a new wireless communication standard has developed rapidly in recent years, such as the microcellular standard for wireless communication in the frequency band around 1990MHz, including: PACS (Personal Access Communication System) in the United States, DETECT (Digital Enhanced Cordless Communication) in Europe System), Japan's PHS (Personal Handheld System) and so on.

Chinese invention patent 96180209 discloses "A method and system for supporting PACS with a GSM mobile communication switching center". This patent is based on the PACS standard and integrates PACS and GSM, so that the PACS system can be interconnected with the public telephone switching network to realize microcells system. Compared with the GSM system, PACS has the following advantages: the base station is small and cheap, it is very convenient to install, the transmission power is small, and the transmission radius generally does not exceed a few kilometers; its narrowband transmission format forms more frequency points in the 10MHz subband, and the user capacity is relatively large ; The voice quality (32 kbit/s) is better, and the bandwidth of various data services is higher (64 kbit/s); but it also has the following disadvantages: it can only support users who move at a lower speed; frequently.

The above-mentioned patent also makes it compatible with GSM by modifying the protocol of the PACS system. Judging from today's actual development situation, Japan's personal handheld system (PHS) is relatively mature, and has been widely used in Japan and China. Compatibility between the PHS system and the GSM system is already an objective demand of the market. PHS and PACS belong to the same protocol system. The above-mentioned patent system applies to the situation where PACS is replaced by PHS, but in the PHS system, PS (personal terminal, corresponding to the subscriber unit in PACS, hereinafter referred to as SU) and base station (hereinafter referred to as CS), corresponding to The wireless port in PACS (hereinafter referred to as RP) has been mass-produced by many companies such as Sanyo, Hitachi, Kyocera, and ZTE. Therefore, it is no longer feasible to modify the protocol between PS, CS, and RPCU in PHS to be compatible with GSM. However, the prior art cannot solve this problem well.

Contents of the invention

The technical problem to be solved by the present invention is how to realize the compatibility between the PHS system and the GSM system on the basis of retaining the interface protocol STD28 between PS and CS. The core idea to solve this problem is to realize the compatibility between PHS and GSM by modifying the interface between the radio port control unit (“radio port control unit” hereinafter referred to as RPCU) and GSM. More specifically, the present invention proposes an efficient and highly functional signaling process between the RPCU and the GSM at the service provider side in the wireless local telephone system. , can effectively improve system stability and system capacity.

The communication system that the inventive method is based on is the compatible communication system of PHS and GSM, and wherein PHS system comprises PS, CS, RPCU, adopts point-to-point direct connection mode between RPCU and GSM, No. 7 MTP part in the A interface of former GSM can The routing selection part is simplified; the signaling process such as encryption in the original A interface can be simplified; for the case where the handover is sent from the old base station controller in the GSM system and sent from the new base station controller in the PHS system, it is necessary to modify the PHS and RPCU interface process. After the above processing, a perfect and efficient A' interface procedure is formed, which is to modify the calling, called, location update and switching procedures between the PHS and RPCU and the GSM system, so as to maintain the connection between PS (personal terminal) and CS (base station). The standard STD28 (Japan PHS Wireless Industry Association Standard) protocol remains unchanged, wherein the calling procedure includes the mobile phone initiating a call, authentication, listening to the ring back tone and called off-hook, and the called procedure includes paging the called, Authentication, called ringing, called off-hook, the location update includes the mobile phone initiates a location update, authentication, and location update, and the switching procedure includes initiating switching, removing the old RCPU session, and connecting a new RCPU session.

In the location update procedure in the above method, the location update initiated by the mobile phone means that when the mobile phone is turned on, it is found that the PA in the mobile phone is inconsistent with the PA sent in the air interface or when the PS is transferred from one PA to another PA, Initiate the location update process upwards through the CS, which is reflected in the fact that the A' interface initiates a location update request message to the GSM network side; the authentication is to ensure that the PS is a legitimate user, and the user must be identified before the subsequent process, and the location of the identification result can be in The RPCU or the home location register HLR sends messages to the PS and the HLR requiring authentication based on the same random number and key, and sends the calculation results of the same algorithm to the RPCU through messages, and when the comparison results of the RPCUs are consistent, the authentication The authorization is completed; the location update means that after the authentication is completed, the RPCU notifies the HLR, and the HLR modifies the database and registers a new PA corresponding to the user.

In the calling procedure in the above method, the mobile phone initiates a call and refers to that the mobile phone user enters the called number, and when the send key is pressed, the calling process is started, and the RPCU in the A' interface sends an excerpt to the GSM. The phone message contains the called number; the authentication is based on the same random number, key, etc. to send a message requiring authentication to the PS and HLR respectively, and the calculation results of the same algorithm are sent to the RPCU through a message, and the RPCU compares the results Complete authentication when consistent; Discriminate the place of described calculation result can be in RPCU or home location register HLR; Described listening to the ringback tone refers to analyzing the called number at the GSM network side, as being an outgoing user, forwarding the paging message, such as For the system user, start the called process, when the called user rings, send back the called ringing message to the PS through the A' interface, and the called user listens to the ring back tone; the called off-hook is It means that after the called party hears the ringing, pick up the phone and enter the talking state after picking up the call.

In the called procedure in the above method, the paging call is initiated by the network side to the PS through the air interface in the interface A' when the call is made from outside the office or after the mobile phone initiates a call and is authenticated. Paging, after the mobile phone receives it, it initiates a response; the called ringing is after the authentication is completed, the called mobile phone rings, and prompts the calling through the A' interface; the called off-hook is the called The user picks up the phone after hearing the ringing, and the RPCU connects to the corresponding voice channel, and informs the network side that the called party has picked up the phone. In the handover procedure in the above method, the initiating handover refers to initiating a handover request to the network side through the A' interface when the user who is talking moves from the RPCU under one PA to the RPCU under another PA; The removal of the old RCPU voice path is initiated by the network side to the corresponding process on the old RPCU where the mobile phone is located to release the old voice path and the old call process; the connection of the new RCPU voice path is notified by A' after the release is completed The new RPCU cut in connects the new voice channel and completes the switching process.

Implement the realization method of the signaling system in a kind of wireless local telephone system proposed by the present invention, provide the mobility management function by introducing GSM, and introduce systems such as PS and CS that have been used on a large scale by introducing the PHS system, and utilize the present invention to provide The signaling system can ensure the efficient operation of the interface process between RPCU and GSM on the basis of keeping the existing interface protocol between PS and CS unchanged, and maximize compatibility with existing systems and equipment.

Description of drawings

Fig. 1 is the logical flowchart of the location update process based on the method of the present invention;

Fig. 2 is the flow chart of calling based on the method of the present invention to set up;

Fig. 3 is the logical flow diagram of called establishment process;

Fig. 4 is a logic flow chart of the switching process based on the method of the present invention.

Detailed ways

The communication system based on the method proposed by the present invention is different from the prior art in that PHS is used instead of PACS, and the involved parts include PS, CS, RPCU, GSM network, etc. Considering the large-scale promotion of PHS system, keeping PS The standard STD28 agreement with CS is unchanged. For this reason, the present invention selects by revising the former A interface agreement of RPCU and GSM network, makes it become A ' interface agreement, realizes the fusion between PHS and GSM. The message transmission part (hereinafter referred to as MTP) in the A interface protocol, in the implementation of the present invention, because the RPCU and the GSM network side are direct routes, the route selection part can be simplified. Modifications to several relatively independent call processes in communication: location update, calling, called, switching, etc., are reflected in the corresponding procedures and implementations on the above-mentioned A' interface. Instructions one by one are as follows: * Location update process

Step 1: The phone initiates a location update

Step 2: Authentication

Step 3: Location update

Wherein step 1, when the mobile phone is turned on, it is found that the paging area (hereinafter referred to as PA) in the mobile phone is inconsistent with the PA sent in the air interface or when the PS is transferred from one PA to another (including caused by movement not in the call state or being in progress). caused by the movement during the call), the location update process is initiated upwards through the CS. Embodied in the A' interface is to initiate a location update request message to the GSM network side.

Wherein step 2, in order to ensure that PS is a legal user, the user will be discriminated before the follow-up process, and the location of the discriminated result can be at RPCU (or Home Location Register, HLR for short), which sends a message requiring authentication to PS and HLR respectively, They are based on the same random number, key, etc., calculate the results through the same algorithm and send them to the RPCU respectively through messages, and the authentication is completed when the comparison results of the RPCU are consistent. The authentication of the following processes is similar.

For step 3, after the authentication is completed, the RPCU notifies the HLR, and the HLR modifies the database and registers a new PA corresponding to the user. *Calling process

Step 1: The mobile phone initiates a call

Step 2: Authentication

Step 3: Listen to the ring back tone

Step 4: The called party picks up the phone

To step one, the mobile phone user inputs the called number, and when pressing the send key, the calling process is started, and the A' interface RPCU sends an off-hook message to the GSM, including the called number.

For step 2, the authentication is the same as the location update process.

For step 3, the GSM network side analyzes the called number. If it is an outgoing user, forward the paging message. If it is a user of this system, start the called process. When the called user rings, the called number is sent back to PS through the A' interface. Call the ringing message. The called party listens to the ringback tone.

For step 4, after the called user hears the ringing, after picking up the phone, the call channel is connected and enters the talking state. *Called process

Step 1: Paging the called party

Step 2: Authentication

Step 3: The called party rings

Step 4: The called party picks up the phone

For step 1, when calling in from outside the office or after steps 1 and 2 of the calling process above, the network side initiates paging to the PS through the air interface of A', and the mobile phone initiates a response after receiving it, and then enters step 2.

For step 2, the authentication is the same as the location update process.

For step 3, after the authentication is completed, the called mobile phone rings and prompts the calling party through A'.

For step 4, after hearing the ringing, the called user goes off-hook, and the RPCU connects the corresponding voice channel, and informs the network side that the called party has gone off-hook. After the caller receives it, the call is continued and the two parties talk. *Switch process

Step 1: Initiate switching

Step 2: Remove the old RCPU session

Step 3: Connect to the new RCPU session

For step 1, when the user who is talking moves from the RPCU under one PA to the RPCU under another PA, a handover occurs, and a handover request is initiated to the network side through the A' interface.

For step 2, the network side sends a release message to the corresponding process on the old RPCU where the mobile phone is located, releasing the old voice channel and the old call process.

For step 3, after the release of step 2 is completed, the new RPCU cut in is notified through A', it connects the new voice channel, and the handover process is completed. Below, the implementation of the interface flow of the present invention is further described in conjunction with the accompanying drawings, wherein the standard STD28 protocol part between PS and CS, and the standard A interface part of GSM, please refer to the relevant standard protocols. It involves the interface between the RPCU and the GSM network side. The encryption process of the A interface of the original GSM has been simplified in A'. Refer to FIG. 1 for an implementation flowchart of the location update process. When the mobile phone is turned on, it will initiate the location update process when it detects that the PA has changed or moved from one location area to another. First, the CS requests the RPCU to perform location registration (Rigster), and the RPCU sends an authentication (GetKey) message to the GSM through the A' interface, and the message header contains the identifier psid of the mobile phone user (the personal handheld terminal identifier uniquely representing a mobile phone). After the GSM side completes the authentication process, it sends an authentication confirmation (GetKeyAck) message to the RPCU, and returns the authentication random number, authentication calculation result and key for the RPCU to use for authentication judgment. The RPCU sends a Facility message to request the authentication calculation result from the PS side. The PS uses the Facility to return another calculation result after calculating the authentication random number and key. If the RPCU compares the results on both sides, the authentication passes. After the authentication is successful, the RPCU sends a location update request (LocUpReq) message to the GSM, and the message body contains information such as the user's current location area PA and the specific location on the RPCU. After the GSM side database completes the location update operation, it sends a location update confirmation (LocUpReq Ack) message to the RPCU. The RPCU returns a Release Complete message to the PS side, notifying that the location update is successfully completed. Referring to FIG. 2, the flow chart of the execution process of the caller setup procedure is further described. First, the RPCU forwards the call setup (Setup) message to the GSM, and transmits to the GSM the PA of the calling user, the dialed number, and the bearer capacity and supplementary service information for the bearer service and supplementary service; GSM returns the authentication result and assigned circuits. After the RPCU passes through the authentication process similar to Fig. 1, it sends an Access Completion (AccessComp) message to the GSM, and the message contains detailed information of the device where the user is located. After sending the ringing indication to the called user, the GSM sends a called ringing (Alerting) message to the calling RPCU. After receiving the called off-hook message, the GSM sends a connection (StartConv) message to the calling RPCU. The connection message may carry information about supplementary services. After receiving the connect message (Connect), the PS side connects the call path and starts talking. Referring to FIG. 3, the execution process of the called establishment procedure is illustrated. First, the GSM sends a call setup (Setup) message to the RPCU, and transmits the called user's PA, calling number, called number, bearer capacity and supplementary service information to the RPCU; Right request (GetKey) message, GSM returns authentication confirmation (GetKeyAck) message; Through the authentication process similar to Fig. 1. After the RPCU completes the authentication, it sends an access completion (RingAck) message to the GSM, which contains detailed information on the location of the user's device; after the called mobile phone rings, the RPCU sends the GSM a message that the called party has ringing (Alerting) ; After the called user picks up the phone, the RPCU sends a Connect message to the GSM, and the RPCU completes the connection of the user's voice circuit. Referring to Fig. 4, the implementation of the handover procedure is further described. When a handover occurs, the cut-in RPCU2 sends a handover request (HandOverReq) message to the GSM, reporting information such as the new location area PA where the user is located; after the handover is completed, the GSM sends a handover confirmation (HandOverAck) message to the cut-in RPCU2, and transmits a new circuit allocation to the cut-in Switch to continue; and modify the database to record the new PA. At the same time, GSM sends a release (Disconnect) message to the cut-out RPCU1, and fills in the release reason; the cut-out RPCU1 returns a release completion (ReleaseComp) message.

The above describes the call flow involved in the method of the present invention. In practical applications, the capacity and traffic volume of the wireless local telephone system are very large. This signaling system completes the timing relationship of various calls in a simple and effective manner, which is of great significance to the stable operation of the entire system and the expansion of capacity.

Claims (5)

1. A method for realizing a signaling system in a wireless local telephone system, said wireless local telephone system comprising a GSM system, a PHS system compatible with said GSM system, wherein said PHS system comprises PS, CS, RPCU, characterized in that, It includes the following steps: forming an interface A' in a point-to-point direct connection between the GSM and the RPCU, modifying the calling, called, location update, and switching procedures between the PHS and the RPCU and the GSM system, so as to maintain PS and The standard STD28 protocol between CSs remains unchanged, wherein the calling procedure includes calling from the mobile phone, authentication, listening to the ringback tone, and called off-hook, and the called procedure includes paging the called, authentication, called ringing, called off-hook, the location update includes the mobile phone initiates location update, authentication, and location update, and the switching procedure includes initiating switching, removing the old RCPU session, and connecting the new RCPU session. 2. The method for realizing the signaling system in the wireless local telephone system according to claim 1, characterized in that, in the location update procedure, the location update initiated by the mobile phone means that when the mobile phone is turned on, it is found that the PA in the mobile phone and When the PA sent in the air interface is inconsistent or the PS is from one PA to another PA, the location update process is initiated upward through the CS, which is reflected in the A' interface to initiate a location update request message to the GSM network side; the authentication is to ensure that the PS As a legal user, the user must be identified before the follow-up process. The location of the identification result can be in the RPCU or the home location register HLR, and send a message to the PS and HLR to request authentication based on the same random number and key, and send The calculation results of the same algorithm are sent to the RPCU through messages, and the authentication is completed when the comparison results of the RPCUs are consistent; the location update means that after the authentication is completed, the RPCU notifies the HLR, and the HLR modifies the database to register a new PA for the corresponding user. 3. The method for realizing the signaling system in the wireless local telephone system according to claim 1, characterized in that, in the calling procedure, the mobile phone initiates a call when the mobile phone user enters the called number and presses the send key When the calling process is started, the RPCU in the A' interface sends an off-hook message to the GSM containing the called number; message, the calculation results of the same algorithm are sent to the RPCU by message respectively, and the authentication is completed when the RPCU comparison results are consistent; the place to judge the calculation results can be in the RPCU or the home location register HLR; The GSM network side analyzes the called number. If it is an outgoing user, forward the paging message. If it is a system user, start the called process. When the called user rings, send the called number to the PS through the A' interface. For the ringing message, the called user listens to the ring-back tone; the called off-hook refers to that the called user hears the ringing, picks up the phone, and then continues the conversation to enter the talking state. 4. The method for realizing the signaling system in the wireless local telephone system according to claim 1, characterized in that, in the called procedure, the paging called is when calling in from outside the office or through a mobile phone to initiate a call and After authentication, the network side initiates paging to the PS through the air interface in the interface A', and the mobile phone initiates a response after receiving it; the called ringing is that after the authentication is completed, the called mobile phone rings, and Prompt the calling party through the A' interface; the called off-hook means that the called user picks up after hearing the ringing, and the RPCU connects the corresponding voice channel, and tells the network side that the called party has gone off-hook, and the calling party continues after receiving Conversation path, both sides talk. 5. The method for realizing the signaling system in the wireless local telephone system according to claim 1, characterized in that, in the handover procedure, the initiating handover refers to when the user who is talking moves from the RPCU under a PA to the When the RPCU under another PA, initiates a switching request to the network side through the A' interface; the removal of the old RCPU voice path is initiated by the network side to the corresponding process on the old RPCU where the mobile phone is located. Call process; the connection of the new RCPU voice channel is after the release is completed, the new RPCU switched in is notified through A', and the new voice channel is connected to complete the switching process.