CN107343288B

CN107343288B - Method, device and system for connection release in calling process

Info

Publication number: CN107343288B
Application number: CN201610290294.5A
Authority: CN
Inventors: 苑秋红
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2016-05-03
Filing date: 2016-05-03
Publication date: 2021-08-27
Anticipated expiration: 2036-05-03
Also published as: CN107343288A

Abstract

The invention provides a method, a device and a system for connection release in a calling process, and relates to the technical field of communication. The method comprises the following steps: determining whether User Equipment (UE) is in a call flow, and when the UE is determined to be in the call flow, changing the timing duration of the inactive connection release of the UE from a first duration to a second duration, wherein the first duration is the timing duration of the inactive connection release of the data service, and the second duration is the timing duration of the inactive connection release of the voice service; and timing the UE in an inactive state, and releasing the connection of the UE when the timing value exceeds the second time length. The scheme of the invention solves the problems that the existing connection release mode releases UE before the call flow is finished, and the UE can be called again after ringing, but larger signaling consumption can occur, even signaling storm can be caused, the call time is prolonged, and the user experience is influenced.

Description

Method, device and system for connection release in calling process

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method, an apparatus, and a system for connection release during a call.

Background

In an LTE (Long Term Evolution ) system, resources of an access network are limited, and the number of users that can be accessed is also limited. The phenomenon that the current network runs often occurs: the base station eNB has no user data for a long time on the bearer established by the user or the default bearer during operation. Therefore, in order to save system resources, especially to improve resource utilization rate under heavy system load, limited resources are given up to users who really need the resources, operators need to release User connections which do not have any data to be transmitted temporarily, and the release is allowed in the protocol, and the reason for the release can be filled in that the users do not activate User Inactivity. In another scenario, an eNB has processing exception, for example, a UE instance of a user equipment hangs up or a bearer resource related to the UE cannot be released for a long time, and if the processing is not performed in time, the service experience of the user may be seriously affected.

A user bearer does not have uplink and downlink data transmission within a certain time, and may be referred to as a user bearer "inactive". When all the service bearers of the User are in the "inactive" state, it is called "User Inactivity" phenomenon.

Obviously, when the user inactivity phenomenon occurs, the bearer allocated by the eNB to the UE occupies resources but is useless, and for the reason of radio resource optimization, after the eNB detects the user inactivity phenomenon, a corresponding release process needs to be performed.

According to the protocol 36.413, the eNB may initiate a User connection Release Request UE Context Release Request procedure due to User Inactivity. When the eNB finds that all the bearers of the UE have been used in activity, the eNB initiates a UE Context Release Request process to Request a Mobility Management Entity (MME) to Release UE related information. This procedure will release all bearer resources for this UE.

When the UE performs a voice service VoLTE call based on an IMS (IP Multimedia Subsystem), if there is no subscribed coloring ring back tone service with the IMS, there may be a period of no service before a SIP (Session Initiation Protocol) signaling call waits for the called party to go off the hook, so the period is determined by the time of the called party going off the hook, and the called party always does not go off the hook system and generally maintains a ring back tone for 60s at the longest, and after 60s, the user is notified that the other party has no answer and hangs up. Therefore, when the voice call initiated by the UE is inconsistent with the requirement of the Inactivity time of the normal data service, if the Inactivity time of the normal data service is 20s at most, the called party will be released by the User Inactivity timer if the called party is off hook for more than 20s, and the UE will be released before the call flow is completed, so that paging is not possible. Although the called party will re-initiate random access and paging after off-hook, and the calling party and the called party can still call, this undoubtedly increases the signaling consumption of the base station, may cause signaling storm in severe cases, and prolongs the call time, which affects the user experience.

Disclosure of Invention

The invention aims to provide a method, a device and a system for connection release in a calling process, which realize the distinction of the inactive time in a voice service and the inactive time in a data service, improve the user experience and reduce the signaling storm and paging times.

To achieve the above object, an embodiment of the present invention provides a method for connection release during a call, including:

determining whether User Equipment (UE) is in a call flow, and when the UE is determined to be in the call flow, changing the timing duration of the inactive connection release of the UE from a first duration to a second duration, wherein the first duration is the timing duration of the inactive connection release of the data service, and the second duration is the timing duration of the inactive connection release of the voice service;

and timing the UE in an inactive state, and releasing the connection of the UE when the timing value exceeds the second time length.

Wherein the step of determining whether the user equipment UE is in a call flow includes:

judging whether the UE establishes a voice bearer QCI1 bearer;

if the UE has established the QCI1 bearer, determining that the UE is in a call flow;

and if the UE does not establish the QCI1 bearer, identifying whether the UE is in a call flow according to Session Initiation Protocol (SIP) signaling on a signaling bearer QCI 5.

Wherein the step of identifying whether the UE is in a call flow according to the session initiation protocol SIP signaling over the signaling bearer QCI5 includes:

judging whether the SIP signaling is an encrypted signaling;

if the SIP signaling is unencrypted signaling, analyzing the SIP signaling, and determining that the UE is in a call flow when the UE initiates or receives an invite request message;

and if the SIP signaling is encrypted signaling, determining whether the UE is in a call flow according to the data size of the downlink SIP signaling.

Wherein, the step of determining whether the UE is in a call flow according to the data size of the downlink SIP signaling includes:

sequentially acquiring the sizes of data packets with time intervals smaller than or equal to a first threshold value in a downlink SIP signaling;

and when the accumulated value of the data packets is larger than or equal to a second threshold value or the accumulated value belongs to a preset range, determining that the UE is in a call flow.

Wherein the method further comprises:

and within the second time length, stopping timing after the UE is determined to be changed from the inactive state to the active state.

Wherein the method further comprises:

and in the second time length, when the UE is detected to have cell switching, deleting the timing information of the inactive state in the wireless resource configuration information, and then sending the wireless resource configuration information to a target base station corresponding to a target cell.

And the second time length is set according to the waiting time length after dialing.

In order to achieve the above object, an embodiment of the present invention further provides an apparatus for connection release during a call, including:

a first processing module, configured to determine whether a UE is in a call flow, and change a timing duration of an inactive connection release of the UE from a first duration to a second duration when the UE is determined to be in the call flow, where the first duration is a timing duration of an inactive connection release of a data service, and the second duration is a timing duration of an inactive connection release of a voice service;

and the connection release module is used for timing the UE in an inactive state and releasing the connection of the UE when the timing value exceeds the second time length.

Wherein the first processing module comprises:

the judging submodule is used for judging whether the UE establishes the voice bearing QCI1 bearing;

a determining submodule, configured to determine that the UE is in a call flow if the UE has established a QCI1 bearer;

and the identification submodule is used for identifying whether the UE is in a call flow according to Session Initiation Protocol (SIP) signaling on signaling bearer QCI5 if the UE does not establish the QCI1 bearer.

Wherein the identification submodule comprises:

the judging unit is used for judging whether the SIP signaling is the encrypted signaling;

a first determining unit, configured to, if the SIP signaling is an unencrypted signaling, parse the SIP signaling, and determine that the UE is in a call flow when the UE initiates or receives a request invite message;

and a second determining unit, configured to determine whether the UE is in a call flow according to a data size of a downlink SIP signaling if the SIP signaling is an encrypted signaling.

Wherein the second determination unit includes:

the acquisition subunit is used for sequentially acquiring the sizes of the data packets with the time intervals smaller than or equal to a first threshold value in the downlink SIP signaling;

a determining subunit, configured to determine that the UE is in a call flow when the accumulated value of the data packet is greater than or equal to a second threshold, or the accumulated value belongs to a preset range.

Wherein the apparatus further comprises:

and the timing management module is used for stopping timing after determining that the UE is changed from the inactive state to the active state within the second time length.

Wherein the apparatus further comprises:

and the second processing module is used for sending the radio resource configuration information to a target base station corresponding to a target cell after deleting the timing information in the inactive state in the radio resource configuration information when detecting that the UE is subjected to cell switching within the second time length.

To achieve the above object, an embodiment of the present invention further provides a system for connection release during a call, including the apparatus for connection release during a call as described above.

The technical scheme of the invention has the following beneficial effects:

the method for releasing the connection in the calling process of the embodiment of the invention sets two timing durations of the release of the inactive connection, the timing duration of the release of the inactive connection of the data service is the first duration and the timing duration of the release of the inactive connection of the voice service is the second duration, when the UE is determined to be in the calling process, the timing duration of the release of the inactive connection of the UE is changed from the first duration to the second duration, then the UE is timed in an inactive state, and the connection of the UE is released when the timing duration exceeds the second duration. By prolonging the timing duration of the non-activated connection release, the connection release is more reasonably adjusted, the purpose of reducing signaling storm and paging times in the calling process is achieved, and the user experience is improved.

Drawings

FIG. 1 is a flowchart illustrating steps of a method for connection release during a call according to an embodiment of the present invention;

fig. 2 is a flowchart illustrating a first specific step of a method for connection release during a call according to an embodiment of the present invention;

fig. 3 is a flowchart illustrating a second specific step of a method for connection release during a call according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a device for connection release during a call according to an embodiment of the present invention.

Detailed Description

In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.

The invention provides a method for connection release in a calling process aiming at the problems that the existing connection release mode can generate larger signaling consumption in the calling process and even cause signaling storm, so that the non-activation time in a voice service is distinguished from the non-activation time in a data service, the user experience is improved, and the signaling storm and paging frequency are reduced.

As shown in fig. 1, a method for releasing a connection during a call according to an embodiment of the present invention includes:

step 101, determining whether User Equipment (UE) is in a call flow, and when the UE is determined to be in the call flow, changing a timing duration of inactive connection release of the UE from a first duration to a second duration, wherein the first duration is the timing duration of inactive connection release of a data service, and the second duration is the timing duration of inactive connection release of a voice service;

step 102, timing the UE in an inactive state, and releasing the connection of the UE when the timing value exceeds the second time length.

Because the waiting time from dialing to the non-response call stop of the opposite side in the voice service is longer than the timing time of the non-active connection release set by the system, in the embodiment of the invention, two kinds of timing time of the non-active connection release are set, the timing time of the non-active connection release of the data service is the first time and the timing time of the non-active connection release of the voice service is the second time, wherein the second time is longer than the first time, the non-active time of different services is distinguished, when the UE is determined to be in a call flow, the timing time of the non-active connection release of the UE is changed from the first time to the second time, then, the UE is timed in a non-active state, and the connection of the UE is released when the timing time exceeds the second time. By prolonging the timing duration of the non-activated connection release, the connection release is more reasonably adjusted, the purpose of reducing signaling storm and paging times in the calling process is achieved, and the user experience is improved.

Preferably, the second time period is set according to the waiting time period after dialing.

The waiting time after dialing is the time length from dialing to called no-answer call stopping, and for better less signaling storm and paging times, the second time is longer than or equal to the waiting time after dialing, so that connection release cannot be carried out in the call process of the voice service, and the user experience is further improved.

It should be understood that, in the embodiment of the present invention, the specific implementation of detecting the inactive state of the UE is to scan the inactive service bearer condition according to a preset period Ts, and when the USER INACTIVITY indicates that no USER data is transmitted on all bearers established by the UE, that is, all service bearers of the UE are inactive, report an inactive message of the UE, and when data is on the bearers, report an active message of the UE. In addition, in the embodiment of the present invention, the timing of the UE in the inactive state may be completed by a User inactive User Inactivity timer, and for a first time duration, the first time duration corresponds to a first Inactivity timer, and a second time duration corresponds to a second Inactivity timer, and the first time duration is applicable to other services besides a voice service besides a data service.

The UE often establishes a voice bearer QCI1 bearer, and it is known that the UE is always in a call flow, and therefore, specifically, as shown in fig. 2, in step 101, the step of determining whether the UE is in the call flow includes:

step 1011, determining whether the UE establishes a voice bearer QCI1 bearer;

step 1012, if the UE has established the QCI1 bearer, determining that the UE is in a call flow;

step 1013, if the UE does not establish the QCI1 bearer, identifying whether the UE is in a call flow according to a session initiation protocol SIP signaling carried on the signaling bearer QCI 5.

Whether the UE is in the call flow can be determined by determining whether the UE establishes the QCI1 bearer or not, and the UE already establishes the QCI1 bearer, so that it can be determined that the UE is in the call flow, but the UE which does not establish the QCI1 bearer needs to further determine according to the SIP signaling on the QCI 5.

Further, as shown in fig. 3, in step 1013, the step of identifying whether the UE is in a call flow according to the session initiation protocol SIP signaling on the signaling bearer QCI5 includes:

step 10131, judging whether the SIP signaling is an encrypted signaling;

step 10132, if the SIP signaling is an unencrypted signaling, analyzing the SIP signaling, and determining that the UE is in a call flow when the UE initiates or receives a request invite message;

step 10133, if the SIP signaling is an encrypted signaling, determining whether the UE is in a call flow according to the data size of the downlink SIP signaling.

Since the SIP signaling is encrypted sometimes in order to improve the security of the signaling, it is first determined whether the SIP signaling is encrypted, the unencrypted SIP signaling can be analyzed, and it is determined whether the UE initiating or receiving the invite message is in a call flow by determining whether the UE initiates or receives the invite message. For the encrypted SIP signaling, since it cannot be directly determined whether to initiate or receive the invite message, it is determined whether the UE is in the call flow according to the data size of the downlink SIP signaling.

Further, in step 10133, the step of determining whether the UE is in a call flow according to the data size of the downlink SIP signaling includes:

The method comprises the steps of sequentially obtaining the size of data packets with time intervals smaller than or equal to a first threshold value in a downlink SIP signaling by receiving and recording data packets in the downlink SIP signaling, and then determining whether the UE is in a calling process or not by comparing a second threshold value or a preset range. The second threshold is set according to the size of the invite message, and the preset range is set according to the 100trying message, so that whether the data packet is the invite message or the 100trying message can be determined by comparing the accumulated size of the data packet with the second threshold or a preset range, and thus, whether the UE is in the call flow is determined.

However, in the process of timing the UE in the inactive state, the UE may also have a state change, and therefore, in the embodiment of the present invention, the method further includes:

Because the UE whose timing value does not reach the second duration enters the active state again, the timing needs to be stopped in order not to affect the normal operation of the user service in the later period.

In addition, in the process of timing the inactive state of the UE, there is a situation that a cell to which the UE belongs is switched, and after the UE is switched to the target cell, the timing duration of the inactive connection release of the base station corresponding to the target cell may not be adjusted to adapt to the voice service, so that the method further includes:

Through the step, the UE with the timing value not reaching the second duration and having the cell switching is deleted the timing information in the inactive state in the wireless resource configuration information, so that after the wireless resource configuration information is sent to the target base station corresponding to the target cell, the target base station performs the inactive state timing again on the UE in the inactive state, the call flow is ensured to continue, and the user experience of the voice call is further improved.

The following describes an application of the method for connection release in a call process according to the embodiment of the present invention with reference to a specific application scenario (in the following application scenario, the UE has not established a QCI1 bearer):

in a first scenario, in an LTE system, SIP signaling between an IMS and a UE is not encrypted, a timing duration of a first inactivity timer is configured to be 10s, a timing duration of a second inactivity timer is configured to be 60s, Ts is configured to be 2s, and a UE in a cell is called, that is, the UE is a called party.

The base station of the cell directly analyzes the downlink SIP signaling by applying the method for connection release in the calling process of the embodiment of the invention, and detects the non-activated state of the UE by taking 2s as a period. And when the UE enters an inactive state and the invite message is analyzed to determine that the UE is in a call flow, changing the timing duration of a second inactive timer which is specially configured for VOLTE call by using 60s, starting the second inactive timer, and waiting for the timer to be overtime for connection release. QCI1 bearer establishment after 3 s. After 5s, the UE initiates a handover procedure, and at this time, it sends radio resource configuration information (specifically, the handover cell does not carry UE-InactiveTime in RRM-Config) that does not carry the inactive state timing information to the base station corresponding to the target cell. In this way, after the target cell is switched, the UE enters the active state because the UE does not carry the timing information of the inactive state, and after detecting that the UE is in the inactive state after 2s, the second inactivity timer is restarted to wait for the timeout of the timer to perform connection release because the QCI1 bearer is established and carries the QCI1 bearer.

In a second scenario, in an LTE system, SIP signaling between an IMS and a UE is not encrypted, the timing duration of a first inactivity timer is configured to be 10s, the timing duration of a second inactivity timer is configured to be 60s, Ts is configured to be 2s, and a UE in a cell initiates a call, that is, the UE is a calling party.

The base station of the cell directly analyzes the downlink SIP signaling by applying the method for connection release in the calling process of the embodiment of the invention, and detects the non-activated state of the UE by taking 2s as a period. And when the UE enters an inactive state and the invite message is analyzed to determine that the UE is in a call flow, changing the timing duration of a second inactive timer which is specially configured for VOLTE call by using 60s, starting the second inactive timer, and waiting for the timer to be overtime for connection release. QCI1 bearer establishment after 3 s. And then, detecting that the UE bears data, converting the UE into an activated state, and stopping the timing of the second inactivated timer.

In a third scenario, in an LTE system, SIP signaling between an IMS and a UE is encrypted, the timing duration of a first inactivity timer is configured to 10s, the timing duration of a second inactivity timer is configured to 60s, Ts is configured to 2s, a second threshold (downlink invite determination threshold) of a packet accumulation value is 1700Byte, a preset range (downlink 100Trying interval) is 300, 600Byte, a packet receiving interval is 2ms, and a UE in a cell initiates a call, that is, the UE is a calling party.

When the base station of the cell applies the method for connection release in the call process of the embodiment of the present invention, a 550Byte data packet appears in the downlink direction of QCI5, and no other data packet exists within 2ms, the data packet is greater than 300Byte and less than 600Byte, the requirement of the preset range is met, and the UE can be determined to be in the call process. In the periodic detection, it is known that the UE enters an inactive state, the timing duration of a second inactivity timer configured specifically for the VOLTE call is changed to 60s, the second inactivity timer is started, and the connection release is performed after the timer expires. QCI1 bearer establishment after 3 s. And then, when the timing duration of the second inactivity timer is not reached to 60s, the UE detects that the UE bears data, the UE is switched to an active state, and the timing of the second inactivity timer is stopped.

And fourthly, encrypting SIP signaling between the IMS and the UE in the LTE system, wherein the timing duration of the first inactivity timer is configured to be 10s, the timing duration of the second inactivity timer is configured to be 60s, Ts is configured to be 2s, the second threshold (downlink invite judgment threshold) of the data packet accumulation value is 1700Byte, the preset range (downlink 100Trying interval) is 300, 600Byte, the data packet receiving interval is 2ms, and one UE in the cell is called, namely the UE is called.

By applying the method for connection release during a call of the embodiment of the present invention, the base station of the cell determines that the UE is in a call process when two data packets continuously spaced within 2ms appear in the downlink direction of QCI5, where the data packets are 1486Byte and 400Byte, respectively, and the cumulative value of the two data packets is greater than the second threshold 1700 Byte. In the periodic detection, it is known that the UE enters an inactive state, the timing duration of a second inactivity timer configured specifically for the VOLTE call is changed to 60s, the second inactivity timer is started, and the connection release is performed after the timer expires. QCI1 bearer establishment after 3 s. And then, when the timing duration of the second inactivity timer is not reached to 60s, the UE detects that the UE bears data, the UE is switched to an active state, and the timing of the second inactivity timer is stopped.

In summary, the method for connection release in a call process according to the embodiment of the present invention not only reduces signaling storm and paging times in the call process by differentiating the inactive time in the voice service from the inactive time in the data service, and improves user experience, but also maintains an inactive timer in handover, and ensures that a call flow continues.

As shown in fig. 4, an embodiment of the present invention further provides an apparatus for releasing a connection during a call, including:

a first processing module 401, configured to determine whether a UE is in a call flow, and when it is determined that the UE is in the call flow, change a timing duration of an inactive connection release of the UE from a first duration to a second duration, where the first duration is a timing duration of an inactive connection release of a data service, and the second duration is a timing duration of an inactive connection release of a voice service;

a connection releasing module 402, configured to time the UE in an inactive state, and release the connection of the UE when a time value of the time exceeds the second duration.

Wherein the first processing module comprises:

Wherein the identification submodule comprises:

Wherein the second determination unit includes:

Wherein the apparatus further comprises:

The device for connection release in the calling process of the embodiment of the invention not only distinguishes the inactive time in the voice service from the inactive time in the data service, reduces signaling storm and paging frequency in the calling process, improves user experience, but also can maintain the inactive timer in the switching process and ensures the continuation of the calling process.

It should be noted that the apparatus is an apparatus to which the method for releasing connection in the call process is applied, and the implementation manner of the method for releasing connection in the call process in the embodiment is applicable to the apparatus, and the same technical effect can be achieved.

The embodiment of the invention also provides a system for releasing the connection in the calling process, which comprises the device for releasing the connection in the calling process.

The system for connection release in the calling process of the embodiment of the invention not only reduces signaling storm and paging times in the calling process and improves user experience by distinguishing the inactive time in the voice service from the inactive time in the data service, but also can maintain the inactive timer in the switching process and ensure the continuation of the calling process.

It should be noted that the system is a system to which the method for releasing connection in the calling process is applied, and the implementation manner of the method for releasing connection in the calling process in the embodiment is applicable to the system, and can achieve the same technical effect.

It is further noted that many of the functional units described in this specification have been labeled as modules, in order to more particularly emphasize their implementation independence.

In embodiments of the present invention, modules may be implemented in software for execution by various types of processors. An identified module of executable code may, for instance, comprise one or more physical or logical blocks of computer instructions which may, for instance, be constructed as an object, procedure, or function. Nevertheless, the executables of an identified module need not be physically located together, but may comprise disparate instructions stored in different bits which, when joined logically together, comprise the module and achieve the stated purpose for the module.

Indeed, a module of executable code may be a single instruction, or many instructions, and may even be distributed over several different code segments, among different programs, and across several memory devices. Likewise, operational data may be identified within the modules and may be embodied in any suitable form and organized within any suitable type of data structure. The operational data may be collected as a single data set, or may be distributed over different locations including over different storage devices, and may exist, at least partially, merely as electronic signals on a system or network.

When a module can be implemented by software, considering the level of existing hardware technology, a module implemented by software may build a corresponding hardware circuit to implement a corresponding function, without considering cost, and the hardware circuit may include a conventional Very Large Scale Integration (VLSI) circuit or a gate array and an existing semiconductor such as a logic chip, a transistor, or other discrete components. A module may also be implemented in programmable hardware devices such as field programmable gate arrays, programmable array logic, programmable logic devices or the like.

Exemplary embodiments are described below with reference to the drawings. Many different forms and embodiments of the invention may be made without departing from the spirit and teachings of the invention, and therefore, the invention should not be construed as limited to the exemplary embodiments set forth herein. Rather, these exemplary embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, the size and relative sizes of elements may be exaggerated for clarity. The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Unless otherwise indicated, a range of values, when stated, includes the upper and lower limits of the range and any subranges therebetween.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A method for connection release during a call, comprising:

2. The method of claim 1, wherein the step of determining whether the UE is in a call process comprises:

judging whether the UE establishes a voice bearer QCI1 bearer;

3. The method of claim 2, wherein the step of identifying whether the UE is in a call flow according to session initiation protocol, SIP, signaling over a signaling bearer QCI5 comprises:

judging whether the SIP signaling is an encrypted signaling;

4. The method of claim 3, wherein the step of determining whether the UE is in a call process according to the data size of the downlink SIP signaling comprises:

5. The method of claim 1, wherein the method further comprises:

6. The method of claim 1, wherein the method further comprises:

7. The method of claim 1, wherein the second duration is set according to a waiting duration after dialing.

8. An apparatus for connection release during a call, comprising:

9. The apparatus of claim 8, wherein the first processing module comprises:

10. The apparatus of claim 9, wherein the identification submodule comprises:

11. The apparatus of claim 10, wherein the second determining unit comprises:

12. The apparatus for connection release during a call according to claim 8, wherein said apparatus further comprises:

13. The apparatus for connection release during a call according to claim 8, wherein said apparatus further comprises:

14. The apparatus of claim 8, wherein the second duration is set according to a waiting duration after dialing.

15. A system for connection release during a call, comprising means for connection release during a call according to any of claims 8 to 14.