CN102170709B - Method and mobile device for synchronously maintaining packet data communication protocol context state - Google Patents

Abstract

A method for synchronously maintaining the context state of a Packet Data Protocol (PDP) comprises requesting a wireless communication network to suspend a first packet switched service when establishing a circuit switched connection with the wireless communication network; closing the first packet data communication protocol context after the circuit switched connection is established; when the circuit switched connection is disconnected and a reply notification of the first packet switched service is received from the wireless communication network, the closing state of the first packet data communication protocol context is notified to the wireless communication network. A mobile device comprising: a suspend request module for requesting the wireless communication network to suspend the first packet switched service; a packet data communication protocol context closing module for closing the first packet data communication protocol context; and a status notification module for notifying the wireless communication network of the closed status of the first SDP context.

Description

Method and mobile device for synchronously maintaining packet data communication protocol context state

technical field

The present invention relates to a mobile device of a wireless communication network, in particular to a method for synchronously maintaining a packet data communication protocol (PDP) context state between a wireless communication network and a mobile device and the related mobile device.

Background technique

In the current Global System for Mobile communications (GSM) network (hereinafter referred to as GSM/GPRS network) supporting General Packet Radio Service (General Packet Radio Service, GPRS), when a mobile device (or user When at least one of the equipment (user equipment) and the network does not support dual transfer mode (dual transfer mode, DTM), it will cause the mobile device to be unable to perform circuit-switched connection and packet-switched connection with the network at the same time (packet-switched connection). In a GSM/GPRS network, a circuit-switched connection such as a GSM call connection can provide voice call services; a packet-switched connection such as a GPRS connection can provide data transmission services. Therefore, if the dual transmission mode is not supported, the mobile device cannot establish a GPRS connection after establishing a GSM call connection with the network, so in some cases, it will make it impossible to maintain the PDP context state synchronously between the network and the mobile device ( PDP context status).

Figure 1 shows how the problem of PDP context state desynchronization between the mobile device and the GSM/GPRS network occurs in the prior art. In the process of FIG. 1 , at the beginning, there is an activated PDP context in the mobile device for packet switching service (in GSM/GPRS network, it is GPRS service). Then, in step 11, if the user wants to make a GSM call, such as making a call or answering a call, the mobile device executes the GPRS suspension procedure (GPRS suspension procedure, referring to 3GPP TS 44.018, Section 3.4.25) on the one hand, requiring the network The packet switching service is suspended, and on the other hand, the call connection procedure is performed to establish a GSM call connection with the network. After the GSM call connection is established, in step 12, if the user does not want to use the packet switching service any more, but wants to close the PDP context, the mobile device will execute the PDP context deactivation procedure (PDP context deactivation procedure, referring to 3GPP TS 24.008, Section 6.1 .3.4), to try to send a deactivate PDP context request message (Deactivate PDP Context Request message), and start the timer T3390, waiting for the response of the network. However, since the GSM call connection has been established at this time, the mobile device cannot establish a GPRS connection to send the close PDP context request message to the network, so the mobile device will not receive a response from the network until the timer counts up. According to 3GPP TS 24.008, section 6.1.3.4.3, at this time, the mobile device will resend the close PDP context request message, reset and start the timer T3390, and so on. After the timer T3390 counts up for the fifth time, the mobile device closes the PDP context at its local end to release the configured related radio resources and delete the relevant information of the PDP context. "Deactivate locally" means that the mobile device is not connected to the network to complete the PDP context deactivation process synchronously, but only performs deactivation unilaterally, so the network does not know that the mobile device has deactivated the PDP context. Next, in step 13, when the user wants to end the GSM call, the mobile device executes the call disconnection procedure, and in step 14, the network executes GPRS resumption, and then sends the radio resource channel of the mobile device Whether the response is successful or not is indicated in the release message (RR Channel Release message). If the GPRS reply is successful, the mobile device will judge that the GPRS reply will not be executed, and thus the routing area updating procedure (routing area updating procedure, see 3GPP TS 24.008, section 4.7.5.1) will not be executed, which will cause problems: The PDP context in the mobile device is actually closed, but the PDP context of the network is still activated, thus making the PDP context status between the mobile device and the network asynchronous. Then when the mobile device wants to establish a GPRS connection, the network may ignore it, causing the problem that the mobile device cannot use the GPRS service.

Contents of the invention

The purpose of the present invention is to solve the technical problem in the prior art that the PDP context state is not synchronized between the two parties.

In order to achieve the above object, in one embodiment of the present invention, a method for synchronously maintaining the PDP context state is disclosed, which is used in a mobile device, and a packet switching service has been activated between the mobile device and the wireless communication network. the PDP context. The method includes: when establishing a circuit switching connection with the wireless communication network, requesting the wireless communication network to suspend the packet switching service; after the circuit switching connection is established, closing the PDP context; When the wireless communication network receives the reply notification from the packet switching service, it notifies the wireless communication network of the closed state of the PDP context.

In another embodiment of the present invention, a mobile device is disclosed, which can maintain the PDP context state synchronously with the wireless communication network. A PDP context for packet switching service has been activated between the mobile device and the wireless communication network. The mobile device includes: a suspend request module, used to request the wireless communication network to suspend the packet switching service when the mobile device establishes a circuit switched connection with the wireless communication network; a PDP context closing module, used to, after the circuit switched connection is established, Closing the PDP context; and a state notification module, used for notifying the wireless communication network of the closing state of the PDP context when receiving a packet switching service reply notification from the wireless communication network after the circuit switching connection is disconnected.

The beneficial effect of the present invention is that only one routing area update procedure needs to be executed, and the closed state of the first and second PDP contexts can be notified to the network without executing the PDP context closing procedure twice, thus saving mobile devices and The workload of signaling between networks.

Description of drawings

FIG. 1 shows how the problem of PDP context state desynchronization between the mobile device and the GSM/GPRS network occurs in the prior art.

FIG. 2 shows how an embodiment of the present invention handles the problem of out-of-sync PDP context status between the mobile device and the GSM/GPRS network.

FIG. 3 is a flowchart illustrating a method for maintaining a synchronized PDP context state between a wireless communication network and a mobile device according to an embodiment of the invention.

Fig. 4 shows part of the routing area update request message.

Figure 5 is the format of an information element showing PDP context status.

FIG. 6 is a block diagram of an embodiment of the mobile device of the present invention.

Explanation of reference signs:

60-mobile device; 61-pause request module; 62-PDP context closing module; 63-status notification module.

Detailed ways

The various embodiments described in this section are all applied to mobile devices (such as but not limited to mobile phones) and wireless communication networks (such as but not limited to GSM/GPRS networks), at least one of which does not support dual transfer mode ) situation. The so-called situation that the wireless communication network does not support the dual transmission mode here does not necessarily mean that the entire network does not support it, and it may be that only some network devices such as some cells do not support it. Therefore, the present invention is still applicable when the mobile device is interconnected with the network via a network device that does not support dual transport modes. These embodiments will be described in detail below with reference to figures.

In the GSM/GPRS network, if the mobile device supports the GPRS function, it needs to execute a routing area updating procedure (routing area updating procedure) every once in a while to inform the network of its current routing area. In some other specific situations, such as when the mobile device determines that GPRS resumption is required, the mobile device will also execute the routing area update procedure, as described in Section 4.7.5.1 of 3GPP TS 24.008. However, as described in the previous "Prior Art" section, in step 14 of FIG. 1, if the network notifies the mobile device of the success of the GPRS reply after the GSM call ends, the mobile device judges that it does not need to perform the GPRS reply, so Also, the routing area update procedure will not be executed, causing the PDP context state between the mobile device and the network to be out of sync. In view of this, in one embodiment of the present invention, a specific situation that the mobile device needs to execute the routing area update procedure is newly added, that is, if the mobile device has previously closed the PDP context at the local end, the mobile device also needs to execute The routing area update program is shown in steps 21 and 22 of the process in FIG. 2 . In step 21, the mobile device judges that the PDP context has been closed at the local end before, and then executes the routing area update procedure in step 22 to send a routing area update request message (Routing Area Update Request message) to the network, and this message includes The information element (information element) that can display the current PDP context state (closed state) in the mobile device, so after the network responds to the routing area update accept message (Routing Area Update Accept message) to the mobile device, the mobile device and the network A synchronized PDP context state can be achieved within a short period of time, as shown in FIG. 2 .

FIG. 3 is a flowchart illustrating a method for synchronously maintaining a PDP context state between a wireless communication network and a mobile device according to an embodiment of the present invention. This method is used in mobile devices. Before executing the method, a first PDP context for a first packet switching service has been activated between the mobile device and the wireless communication network. In step 31, when the mobile device establishes a circuit switched connection (such as a voice call connection) with the wireless communication network, the mobile device requests the wireless communication network to suspend the first packet switching service. When the wireless communication network is a GSM/GPRS network, the circuit-switched connection may be a GSM call connection, and the mobile device may execute a GPRS suspension procedure (GPRS suspension procedure, see 3GPP TS 44.018, Section 3.4.25) to request GSM/GPRS The GPRS network suspends the first packet switched service.

In step 32, after the circuit switched connection is established, the mobile device closes the first PDP context locally. The mobile device can automatically close according to the internal setting, or perform the closing action according to the user's request. If the wireless communication network is a GSM/GPRS network, the mobile device repeatedly sends out the PDP context deactivation request message (Deactivate PDP context deactivation procedure) five times during the execution of the PDP context deactivation procedure (see 3GPP TS 24.008, section 6.1.3.4). Context Request message) but do not receive a network response within the time set by the timer T3390, the first PDP context is closed at the local end.

In step 33, after the circuit switched connection is disconnected, if the mobile device receives the reply notification of the first PS service from the wireless communication network, and knows that the first PS service has been successfully restored, the mobile device notifies the first PDP The closed state of the context is given to the wireless communication network to synchronize the PDP context state between the mobile device and the network. When the wireless communication network is a GSM/GPRS network, the mobile device can send a routing area update request message to notify the GSM/GPRS network of the closed state of the first PDP context by executing the routing area update procedure. Part of the routing area update request message is shown in Figure 4 (see 3GPP TS 24.008, Table 9.4.14), where the information element identifier (IEI) of the PDP context status (PDP context status) is 32, It can be used to record the current state of the first PDP context (closed state at this time). Therefore, after the network receives the routing area update request message, it can update the state of the first PDP context through the included PDP context state information element, so as to maintain synchronization with the mobile device.

Preferably, in step 32, the mobile device also stores a closed record to show that the mobile device has closed the first PDP context at the local end; The off state notifies the wireless communication network.

The embodiment in FIG. 3 can be extended to the situation where two or more PDP contexts are activated between the mobile device and the wireless communication network at the same time. Two PDP contexts are taken as an example below: In addition to the first PDP context, a second PDP context for a second packet switching service has been activated between the mobile device and the network. In this example, the steps in FIG. 3 are adjusted as follows: in step 31, when the mobile device establishes a circuit-switched connection with the network, the mobile device requests the network to suspend the first and second packet-switched services; in step 32, in the circuit-switched After the connection is established, the mobile device closes the first and second PDP contexts at the local end; in step 33, after the circuit switching connection is cut off, if the mobile device receives a reply notification from the network for the first and second packet switching services, then the mobile device The device notifies the network of the closed status of the first and second PDP contexts. If it is a GSM/GPRS network, the mobile device can notify the GSM/GPRS network of the closed status of the first and second PDP contexts at the same time only by executing the routing area update procedure once. This is because, in the routing area update request message, the information element of the PDP context status can record the current status of multiple PDP contexts at the same time, as shown in Figure 5 (see 3GPP TS 24.008, table 10.5.148), wherein each NSAPI (that is, network service access point identifier, network service access point identifier) is a bit used to represent the state of a PDP context, 0 means off, 1 means on (but in the current technical specification, NSAPI (0) ~NSAPI(4) is reserved and not used). Since only one routing area update procedure needs to be performed, instead of two PDP context close procedures, the network can be notified of the closed status of the first and second PDP contexts, thus saving signal transmission (signaling) between the mobile device and the network workload. As for the operation when more than two PDP contexts have been activated between the mobile device and the network at the same time, the above steps can be analogized.

6 is a block diagram of an embodiment of the mobile device of the present invention, wherein the mobile device 60 can maintain the PDP context state synchronously with a wireless communication network, and includes a pause request module 61, a PDP context closing module 62 and A status notification module 63 . In this embodiment, a first PDP context for a first packet switching service has been activated between the mobile device 60 and the wireless communication network. The suspend request module 61 can request the network to suspend the first PS service when the mobile device 60 establishes a circuit switched connection with the network. The PDP context close module 62 can close the first PDP context at the local end of the mobile device 60 after the circuit switched connection is established. After the circuit switched connection is disconnected, if the mobile device 60 receives a reply notification of the first PS service from the network, the status notification module 63 can notify the network of the shutdown status of the first PDP context. When the network is a GSM/GPRS network, the status notification module 63 can send a routing area update request message to notify the GSM/GPRS network of the closed status of the first PDP context by executing the routing area update procedure.

Preferably, the PDP context closing module 62 also stores a closing record in the mobile device 62 to show that the mobile device 62 has closed the first PDP context at the local end; the status notification module 63 then closes the first PDP context according to the closing record Notify the network of the shutdown state.

If the first and second PDP contexts have been activated between the mobile device 60 and the network for the first and second packet switching services respectively, then the suspension request module 61 requires the network to set the first and second PDP contexts when the circuit switching connection is established. The second packet switching service is all suspended; the PDP context closing module 62 closes the first and second PDP contexts at the local end of the mobile device 60 after the circuit switching connection is established; after the circuit switching connection is cut off, if the mobile device 60 from the network After receiving the reply notifications of the first and second PS services, the status notification module 63 notifies the network of the closing status of the first and second PDP contexts. When the network is a GSM/GPRS network, the state notification module 63 only needs to execute the routing area update procedure once, and can simultaneously notify the GSM/GPRS network of the closed state of the first and second PDP contexts. The reasons have been explained above and will not be repeated here.

Please note that the aforesaid suspend request module 61, PDP context closing module 62 and status notification module 63 can utilize hardware, firmware (i.e. the combination of hardware devices, computer instructions and data, computer instructions and data are stored in hardware in the form of read-only software) devices) or electronic systems. Examples of hardware include analog circuits, digital circuits, and mixed circuits, such as microcircuits, microchips, or silicon chips. Examples of electronic systems include System on Chip (SoC), System in Package (SiP), or Computer on Module (CoM).

The above description of the present invention is illustrative rather than restrictive. Those skilled in the art understand that many modifications, changes or equivalents can be made to it within the spirit and scope of the claims, but they will all fall into within the protection scope of the present invention.

Claims (10)

1. one kind synchronously maintains the method for packet data communications protocol context state, be used among a mobile device, wherein between this mobile device and a wireless communication networks, start a first packet data communications protocol context for one first packet-switched service, it is characterized in that, the method comprises:

In the time setting up a circuit switching link with this wireless communication networks, require this wireless communication networks that this first packet-switched service is suspended;

Link after foundation in this circuit switching, close this first packet data communications protocol context; And

Link after cut-out in this circuit switching, in the time that this wireless communication networks receives the reply notice of this first packet-switched service certainly, notify the contextual closed condition of this first packet data communications protocol to give this wireless communication networks.

2. the method for claim 1, is characterized in that, this is closed step and more comprises to store and one close record, to show that this mobile device cuts out this first packet data communications protocol context in local side; In this notifying process, for closing record according to this, notify the contextual closed condition of this first packet data communications protocol to give this wireless communication networks.

3. the method for claim 1, is characterized in that, this wireless communication networks is the global system for mobile communications GSM network of a support general packet wireless service GPRS; This notifying process, for seeing through the Routing Area Update program of execution, is given this wireless communication networks by contextual this first packet data communications protocol closed condition notice.

4. method as claimed in claim 3, it is characterized in that, this Routing Area Update program package is containing sending a Routing Area Update requirement message to this wireless communication networks, and wherein this Routing Area Update requires the information element that message comprises this first packet data communications protocol context state of a demonstration.

5. the method for claim 1, is characterized in that, this wireless communication networks is the global system for mobile communications GSM network of a support general packet wireless service GPRS; Between this mobile device and this wireless communication networks, also started a second packet data communications protocol context for one second packet-switched service, the method also comprises:

In the time that this circuit switching link is set up, require this wireless communication networks that this second packet-switched service is suspended; And

Link after foundation in this circuit switching, close this second packet data communications protocol context;

Wherein, link after cut-out in this circuit switching, in the time that this wireless communication networks receives the reply notice of this first and second packet-switched service certainly, see through the Routing Area Update program of execution, so that contextual this first and second packet data communications protocol closed condition notice is given to this wireless communication networks.

6. a mobile device, can synchronize with a wireless communication networks packet data communications protocol PDP Context state that maintains, wherein between this mobile device and this wireless communication networks, start a first packet data communications protocol context for one first packet-switched service, it is characterized in that, this mobile device comprises:

One suspends and requires module, in order to set up a circuit switching at this mobile device and this wireless communication networks while linking, requires this wireless communication networks by this first packet-switched service time-out;

One packet data communications protocol context closing module, in order to link after foundation in this circuit switching, closes this first packet data communications protocol context; And

One state notifying module, in order to link after cut-out in this circuit switching, in the time that this wireless communication networks receives the reply notice of this first packet-switched service certainly, gives this wireless communication networks by contextual this first packet data communications protocol closed condition notice.

7. mobile device as claimed in claim 6, is characterized in that, this packet data communications protocol context closing module also stores one and closes record, to show that this mobile device cut out the first packet data communications protocol context; This state notifying module is closed record according to this, and contextual this first packet data communications protocol closed condition notice is given to this wireless communication networks.

8. mobile device as claimed in claim 6, is characterized in that, this wireless communication networks is the global system for mobile communications GSM network of a support general packet wireless service GPRS; This state notifying module sees through the Routing Area Update program of execution, and contextual this first packet data communications protocol closed condition notice is given to this wireless communication networks.

9. mobile device as claimed in claim 8, it is characterized in that, this Routing Area Update program package is containing sending a Routing Area Update requirement message to this wireless communication networks, and wherein this Routing Area Update requires the information element that message comprises this first packet data communications protocol context state of a demonstration.

10. mobile device as claimed in claim 6, is characterized in that, this wireless communication networks is the global system for mobile communications GSM network of a support general packet wireless service GPRS; Between this mobile device and this wireless communication networks, also start a second packet data communications protocol context for one second packet-switched service; This time-out requires module in the time that this circuit switching link is set up, and also requires this wireless communication networks that this second packet-switched service is suspended; This packet data communications protocol context closing module links after foundation in this circuit switching, also closes this second packet data communications protocol context; Link after cut-out in this circuit switching, in the time that this wireless communication networks receives the reply notice of this first and second packet-switched service certainly, this state notifying module sees through the Routing Area Update program of execution, and contextual this first and second packet data communications protocol closed condition notice is given to this wireless communication networks.