CN110505667B - User terminal and method and device for processing circuit switching service in LTE system of user terminal - Google Patents
User terminal and method and device for processing circuit switching service in LTE system of user terminal Download PDFInfo
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Abstract
A user terminal and a processing method and a device of circuit switching service under an LTE system thereof are provided, the method comprises the following steps: the terminal resides in an LTE network and sends a CSFB request to the network; if the terminal does not receive the fallback target frequency point fed back by the network within the preset time, judging whether the terminal stores one or more pre-stored frequency points; and if the terminal stores one or more pre-stored frequency points, the terminal tries to fall back to a certain pre-stored frequency point and resides. The invention judges whether the terminal stores one or more pre-stored frequency points or not under the condition that the network does not respond to the CSFB request sent by the terminal for the terminal supporting the CSFB technology in the LTE system, if the terminal stores one or more pre-stored frequency points, the terminal tries to fall back to a certain pre-stored frequency point and resides, the condition that the terminal is forced to reside in a 2G or 3G network by using a network selection mode is reduced, and thus the switching speed of the terminal from the LTE network to the 2G or 3G network can be accelerated under the condition.
Description
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a user equipment and a method and an apparatus for processing a circuit switched service in an LTE system.
Interpretation of related terms
UE-User Equipment-User terminal, called terminal for short;
LTE-Long Term Evolution;
3 GPP-the 3rd Generation Partnership Project-third Generation Partnership Project;
UMTS — Universal Mobile communications System;
OFDM-Orthogonal Frequency Division Multiple-Orthogonal Frequency Division multiplexing;
MIMO-Multi-Input & Multi-output-multiple Input multiple output;
CS-Circuit Switch-Circuit Switch;
PS-Packet Switch;
CSFB-Circuit Switch FallBack-Circuit Domain FallBack;
WAP-Wireless Application Protocol;
UTRAN-Universal Terrestrial Radio Access Network;
GERAN——GSM EDGE Radio Access Network。
background
LTE is a long term evolution of the UMTS technology standard established by the 3GPP organization. The LTE system introduces key technologies such as OFDM and MIMO, and the frequency spectrum efficiency and the data transmission rate are obviously increased. According to the difference of duplex mode, the LTE system can be divided into TD-LTE (Time Division duplex-LTE) and FDD-LTE (Frequency Division duplex-LTE). The difference between the two is mainly reflected on the physical layer (frame structure, time division design, synchronization, etc.) of the air interface, the uplink and downlink of the TD-LTE system use the same frequency band to transmit on different time slots, and have higher frequency spectrum utilization, while the uplink and downlink of the FDD-LTE system use paired frequency bands to receive and transmit data.
Mobile communication services can be classified into CS services and PS services. The CS service mainly includes telephone, short message, etc. (voice telephone service and supplementary service), and the PS service mainly includes WAP, download, etc.
As is well known, the current LTE network is a full PS network, and thus, it can support only PS services and cannot support CS services. However, CS services, represented by voice telephony services, will remain an important and indispensable service for the present time and for a long time in the future. For this reason, various standards organizations actively research and propose various solutions for CS services in the LTE system, and the CSFB technique is a solution for CS services in the LTE system.
The CSFB technique is one of the results of the CS over PS research topic in 3GPP R8, and aims to enable a terminal to initiate a CS service such as a voice telephony service and receive a page of the CS service such as a voice telephony service under LTE access, and to appropriately handle a PS service that the terminal is performing in an LTE network.
The core thought of the CSFB technology is as follows: when the CS service is needed (e.g., initiating a voice call caller or responding to a voice call callee), the CS service falls back to the 2G/3G circuit domain from the LTE network.
The CSFB technology is suitable for a scene of overlapping coverage of a 2G/3G circuit domain and a LTE wireless network, and has the main advantages that the network structure is simple, an IMS system does not need to be deployed, and the existing 2G/3G circuit domain network can be effectively utilized. In the initial stage of building the LTE network, if the operator already has a mature UTRAN/GERAN network, the circuit domain of the existing UTRAN/GERAN network can be used to provide CS service for the LTE system user.
A typical CSFB procedure mainly comprises: joint attach, location update, caller/callee CSFB procedures, and detach, etc. The terminal sends a CSFB request (extended service request message) to the network, after receiving the CSFB request of the terminal, the network usually feeds back a fallback indication message carrying a fallback target frequency point to the terminal, and the terminal then falls back to the 2G or 3G network according to the fallback target frequency point indicated by the network to perform CS service.
The CSFB procedure in the prior art is to rely on network indication. When the network is abnormal for various reasons, the CSFB request sent by the terminal cannot be responded, and in this case, the terminal cannot directly complete the CSFB process due to lack of a fallback target frequency point fed back by the network.
In the prior art, after a terminal sends a CSFB request, if a fallback target frequency point fed back by a network is not received within a preset time, the terminal determines that the CSFB request fails. In this case, the terminal is forced to attempt to camp on the 2G or 3G network by means of network selection.
It can be understood that it takes much time to camp on the 2G or 3G network by way of network selection, which is equivalent to an inter-network handover process without using the CSFB technique, and it usually takes 5 to 10 seconds or more depending on the network conditions. Such long waiting time may seriously affect the user experience of the calling party, and in practical applications, when the calling party user still does not get through after waiting for 5-10 seconds, the calling party user may even abandon the call.
Disclosure of Invention
The technical problem solved by the invention is as follows: for a terminal supporting a CSFB technology in an LTE system, how to realize fast switching from an LTE network to a 2G or 3G network under the condition that a network does not respond to a CSFB request sent by the terminal.
In order to solve the above technical problem, an embodiment of the present invention provides a method for processing a circuit switched service in an LTE system, including:
the terminal resides in an LTE network and sends a CSFB request to the network;
judging whether the terminal receives a fallback target frequency point fed back by the network within a preset time, wherein the fallback target frequency point is sent to the terminal by the network aiming at the CSFB request, the fallback target frequency point can indicate the terminal to fall back to the fallback target frequency point, and the fallback target frequency point belongs to a 2G or 3G network;
if the terminal does not receive the fallback target frequency point fed back by the network within the preset time, judging whether the terminal stores one or more prestored frequency points, wherein the prestored frequency points are prestored;
if the terminal stores one or more pre-stored frequency points, the terminal tries to fall back to a certain pre-stored frequency point and resides;
if the terminal does not store one or more pre-stored frequency points, the terminal tries to reside in a 2G or 3G network in a network selection mode;
the terminal processes the circuit switched traffic after successfully camping under the 2G or 3G network.
Optionally, if the terminal receives the fallback target frequency point fed back by the network within the preset time, the terminal tries to fall back to the fallback target frequency point and resides.
Optionally, if the terminal receives a fallback target frequency point fed back by the network within a preset time, but fails to successfully fall back to the fallback target frequency point and reside, determining whether the terminal stores one or more pre-stored frequency points;
if the terminal stores one or more pre-stored frequency points, the terminal tries to fall back to a certain pre-stored frequency point and resides;
if the terminal does not store one or more pre-stored frequency points, the terminal tries to reside in a 2G or 3G network in a network selection mode;
the terminal processes the circuit switched traffic after successfully camping under the 2G or 3G network.
Optionally, the terminal stores a plurality of pre-stored frequency points, and the plurality of pre-stored frequency points belong to a plurality of networks.
Optionally, the specifically step of the terminal trying to fall back to a certain pre-stored frequency point and residing is: the terminal tries to fall back to a certain pre-stored frequency point and resides, and the network where the pre-stored frequency point belongs and the LTE network where the terminal resides belong to the same operator.
Optionally, if the terminal fails to fall back to a certain pre-stored frequency point and reside, the terminal tries to fall back to another pre-stored frequency point and reside.
Optionally, if a plurality of pre-stored frequency points belong to the same network, the plurality of pre-stored frequency points belonging to the same network are ordered according to the frequency point signal intensity, and the pre-stored frequency points try to reside in sequence according to the frequency point signal intensity in the fallback process.
Optionally, the multiple pre-stored frequency points belong to one or more of GSM, TD-SCDMA, or WCDMA networks.
Optionally, the pre-stored frequency points are stored for CSFB, or stored for other purposes, or stored for non-specific purposes.
Optionally, if the terminal fails to fall back to the pre-stored frequency point and reside, the terminal tries to reside in the 2G or 3G network in a network selection manner.
Optionally, the circuit switched service is a voice telephone service and/or a supplementary service.
In order to solve the above technical problem, an embodiment of the present invention further provides a processing apparatus for a circuit switching service in an LTE system, where a terminal can pre-store a pre-stored frequency point, where the pre-stored frequency point belongs to a 2G or 3G network, and the processing apparatus includes: the system comprises a CSFB request unit, a first judgment unit, a second judgment unit, a CSFB fallback unit, a network selection unit and a service processing unit; wherein:
a CSFB request unit, configured to send a CSFB request to a network when a terminal resides in an LTE network;
the first judgment unit is used for judging whether a terminal receives a fallback target frequency point fed back by a network within a preset time after the CSFB request unit sends a CSFB request to the network, wherein the fallback target frequency point is sent to the terminal by the network aiming at the CSFB request, the fallback target frequency point can indicate the terminal to fall back to the fallback target frequency point, and the fallback target frequency point belongs to a 2G or 3G network;
the second judging unit is used for judging whether the terminal stores one or more prestored frequency points or not under the condition that the first judging unit judges that the terminal does not receive the fallback target frequency point fed back by the network within the preset time, wherein the prestored frequency points are prestored;
the CSFB falling unit is used for the terminal to try to fall back to a certain pre-stored frequency point and stay under the condition that the second judging unit judges that the terminal stores one or more pre-stored frequency points;
the network selection unit is used for the terminal to try to reside in the 2G or 3G network in a network selection mode under the condition that the second judgment unit judges that the terminal does not store one or more pre-stored frequency points;
and the service processing unit is used for processing the circuit switching service after the terminal successfully resides in the 2G or 3G network.
Optionally, the CSFB fallback unit is further configured to, when the first determining unit determines that the terminal receives a fallback target frequency point fed back by the network within a preset time, the terminal attempts to fall back to the fallback target frequency point and reside.
Optionally, when the first determining unit determines that the terminal receives the fallback target frequency point fed back by the network within the preset time, but the terminal fails to successfully fall back to the fallback target frequency point and reside, then:
the second judgment unit is used for judging whether the terminal stores one or more pre-stored frequency points;
the CSFB falling unit is used for the terminal to try to fall back to a certain pre-stored frequency point and stay under the condition that the second judging unit judges that the terminal stores one or more pre-stored frequency points;
the network selection unit is used for trying to reside in a 2G or 3G network in a network selection mode under the condition that the second judgment unit judges that the terminal does not store one or more pre-stored frequency points;
and the service processing unit is used for processing the circuit switching service after the terminal successfully resides in the 2G or 3G network.
Optionally, the terminal stores a plurality of pre-stored frequency points, and the plurality of pre-stored frequency points belong to a plurality of networks.
Optionally, the specifically step of the terminal trying to fall back to a certain pre-stored frequency point and residing is: the terminal tries to fall back to a certain pre-stored frequency point and resides, and the network where the pre-stored frequency point belongs and the LTE network where the terminal resides belong to the same operator.
Optionally, the CSFB fallback unit is further configured to, if the terminal fails to successfully fall back to a certain pre-stored frequency point and reside, try to fall back to another pre-stored frequency point and reside.
Optionally, if a plurality of pre-stored frequency points belong to the same network, the plurality of pre-stored frequency points belonging to the same network are ordered according to the frequency point signal intensity, and the pre-stored frequency points try to reside in sequence according to the frequency point signal intensity in the fallback process.
Optionally, the multiple pre-stored frequency points belong to one or more of GSM, TD-SCDMA, or WCDMA networks.
Optionally, the pre-stored frequency points are stored for CSFB, or stored for other purposes, or stored for non-specific purposes.
Optionally, the network selection unit is further configured to, if the terminal fails to fall back to the pre-stored frequency point and reside, try to reside in the 2G or 3G network by using a network selection method.
Optionally, the circuit switched service is a voice telephone service and/or a supplementary service.
In order to solve the above technical problem, an embodiment of the present invention further provides a user terminal, where the terminal can pre-store a pre-stored frequency point, the pre-stored frequency point belongs to a 2G or 3G network, and the terminal supports a conventional CSFB technique that depends on network indication in an LTE system, and further includes a processing apparatus for a circuit switching service in the LTE system.
Optionally, the user terminal is a smart phone.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
for a terminal supporting the CSFB technology in the LTE system, under the condition that a network does not respond to a CSFB request sent by the terminal, whether the terminal stores one or more pre-stored frequency points or not is judged, if the terminal stores one or more pre-stored frequency points, the terminal tries to fall back to a certain pre-stored frequency point and resides, the condition that the terminal is forced to reside in a 2G or 3G network by using a network selection mode is reduced, and therefore the switching speed of the terminal from the LTE network to the 2G or 3G network can be increased under the condition.
Furthermore, the terminal tries to fall back to a certain pre-stored frequency point and reside, and the network to which the pre-stored frequency point belongs and the LTE network in which the terminal resides belong to the same operator, so that frequency points at which the terminal cannot enjoy the service due to different operators are eliminated, and the switching speed of the terminal from the LTE network to the 2G or 3G network is further increased.
Further, if a plurality of pre-stored frequency points belong to the same network and the network to which the pre-stored frequency points belong and the LTE network in which the terminal resides belong to the same operator, in this case, the plurality of pre-stored frequency points belonging to the same network are sorted according to the frequency point signal intensity, and the pre-stored frequency points try to reside in sequence according to the frequency point signal intensity in the fallback process.
Furthermore, the pre-stored frequency point can be stored for CSFB, other purposes, or non-specific purposes, so that the existing resources in the terminal are fully utilized, and the sources of the pre-stored frequency point are enriched.
Drawings
Fig. 1 is a flowchart of a processing method of a circuit switched service in an LTE system according to an embodiment of the present invention;
fig. 2 is a block diagram of a processing apparatus for circuit switched services in an LTE system according to an embodiment of the present invention.
Detailed Description
As can be seen from the analysis in the background art, in the prior art, for a terminal supporting the CSFB technique in the LTE system, in the case that the network does not respond to the CSFB request sent by the terminal, the terminal may attempt to camp on the 2G or 3G network by way of network selection.
It can be understood that it takes much time to camp on the 2G or 3G network by way of network selection, which is equivalent to an inter-network handover process without using the CSFB technique, and it usually takes 5 to 10 seconds or more depending on the network conditions. Such long waiting time may seriously affect the user experience of the calling party, and in practical applications, when the calling party user still does not get through after waiting for 5-10 seconds, the calling party user may even abandon the call.
For the scenario that the network does not respond to the CSFB request sent by the terminal, the inventor provides a CSFB procedure that can be performed autonomously by the terminal without depending on a network indication after research, so that the fast handover from the LTE network to the 2G or 3G network can still be achieved in the scenario.
The application provides a processing method of circuit switching service in LTE system, which applies the CSFB process which is independent of network indication and can be performed by the terminal independently to the processing of the circuit switching service by the terminal in the LTE system.
In order that those skilled in the art will better understand and realize the present invention, the following detailed description is given by way of specific embodiments with reference to the accompanying drawings.
Example one
As described below, an embodiment of the present invention provides a method for processing a circuit switched service in an LTE system.
Referring to a flow chart of a processing method of a circuit switched service in an LTE system shown in fig. 1, the following detailed description is made through specific steps:
first, the implementation of the processing method for circuit switching service in this embodiment has certain requirements for the terminal itself.
In particular, the terminal itself needs to support the conventional CSFB technique relying on network indication under the LTE system. Meanwhile, the terminal can pre-store pre-stored frequency points, and the pre-stored frequency points belong to a 2G or 3G network.
S101, the terminal resides in the LTE network and sends a CSFB request to the network.
The current LTE network is a full PS network, and thus it can support only PS services and not CS services.
For a terminal supporting the conventional CSFB technology, when the terminal resides in an LTE network and needs to perform a CS service, a CSFB request is sent to the network. The CS service may be a voice telephone service or a supplementary service. The situation that the terminal needs to perform the CS service may be that the terminal initiates a voice call caller or responds to a voice call callee, etc.
As described above, according to the conventional CSFB procedure, after sending a CSFB request to the network, the terminal waits for the network to feed back a fallback indication message carrying a fallback target frequency point, and then falls back to the 2G or 3G network according to the fallback target frequency point indicated by the network to perform a CS service.
That is, the conventional CSFB procedure is to rely on network indication. When the network is abnormal for various reasons, the CSFB request sent by the terminal cannot be responded, and in this case, the terminal cannot directly complete the CSFB process due to lack of a fallback target frequency point fed back by the network.
The embodiment provides an effective solution for the situation that the network cannot respond to the CSFB request sent by the terminal.
And S102, judging whether the terminal receives the fallback target frequency point fed back by the network within the preset time.
The fallback target frequency point is sent to a terminal by a network aiming at the CSFB request, and can indicate the terminal to fall back to the fallback target frequency point, and the fallback target frequency point belongs to a 2G or 3G network.
In a specific implementation, the fallback target frequency point may be generally embodied as neighbor frequency point information of the fallback target frequency point.
Specifically, after sending a CSFB request to the network, the terminal waits for the network to feed back a fallback target frequency point within a preset time. The preset time may be preset before the terminal leaves the factory, or of course, a corresponding interface may be provided for a user to set or adjust the value of the preset time after the terminal leaves the factory.
S103, if the terminal receives the fallback target frequency point fed back by the network within the preset time, the terminal tries to fall back to the fallback target frequency point and resides.
If the terminal receives the fallback target frequency point fed back by the network within the preset time, the terminal supporting the conventional CSFB technology can try to fall back to the fallback target frequency point and reside according to the received fallback target frequency point.
However, as analyzed in the background art, when the network is abnormal for various reasons, the CSFB request sent by the terminal cannot be responded, and in this case, for the existing CSFB technology, the terminal cannot directly complete the CSFB process due to lack of a fallback target frequency point fed back by the network, and is forced to reside in the 2G or 3G network in a network selection manner, so that the time for switching from the LTE network to the 2G or 3G network is greatly prolonged.
In this embodiment, if the terminal does not receive the fallback target frequency point fed back by the network within the preset time, the subsequent step S104 is performed.
In another embodiment, if the terminal receives the neighboring frequency point information of the fallback target frequency point fed back by the network within the preset time, but fails to successfully fall back to the fallback target frequency point and reside, the subsequent step S104 is performed.
And S104, if the terminal does not receive the fallback target frequency point fed back by the network within the preset time, judging whether the terminal stores one or more pre-stored frequency points.
Wherein, the pre-stored frequency point is pre-stored.
For this reason, the terminal needs to have the following capabilities: the terminal can pre-store the pre-stored frequency point, wherein the pre-stored frequency point belongs to a 2G or 3G network.
The pre-stored frequency point may be stored for CSFB, for other purposes, or for non-specific purposes.
That is, the terminal may pre-store the pre-stored frequency points for other purposes or non-specific purposes, for example, the initial purpose of storing the pre-stored frequency points may be to increase the network selection speed, etc. In this embodiment, the pre-stored frequency points originally stored for increasing the network selection speed can be utilized to perform the subsequent steps, thereby fully utilizing the existing resources in the terminal and enriching the sources of the pre-stored frequency points.
And S105, if the terminal stores one or more pre-stored frequency points, the terminal tries to fall back to a certain pre-stored frequency point and resides.
That is, if the terminal stores one or more pre-stored frequency points, the terminal performs a fallback attempt by using a certain pre-stored frequency point as a fallback target frequency point, that is, tries to fall back to and reside under the fallback target frequency point.
It will be appreciated that when the terminal stores a plurality of pre-stored frequency points, the plurality of pre-stored frequency points may belong to a plurality of networks. Specifically, there may be a frequency point under a 2G network and a frequency point under a 3G network; there may be frequency points under both TD-SCDMA network and WCDMA network.
In a specific embodiment, the trying, by the terminal, to fall back to a certain pre-stored frequency point and reside specifically is: the terminal tries to fall back to a certain pre-stored frequency point and resides, and the network where the pre-stored frequency point belongs and the LTE network where the terminal resides belong to the same (communication) operator.
For example, assuming that the LTE network where the terminal resides belongs to the china mobile, the pre-stored frequency point may be a frequency point under the GSM or TD-SCDMA network, that is, belong to the same operator.
Similarly, if the LTE network where the terminal resides belongs to the china unicom, the pre-stored frequency point may be a frequency point in a GSM or WCDMA network, that is, the frequency point belongs to the same operator.
The above description of the technical solution shows that: in this embodiment, the terminal tries to fall back to a certain pre-stored frequency point and reside, and the network to which the pre-stored frequency point belongs and the LTE network in which the terminal resides belong to the same operator, so that frequency points at which the terminal cannot enjoy the service due to the difference of the operators are eliminated, and the switching speed of the terminal from the LTE network to the 2G or 3G network is further increased.
When the terminal stores a plurality of pre-stored frequency points, and the pre-stored frequency points belong to a plurality of networks, if the fallback attempt fails, that is, the terminal cannot successfully fall back to a certain pre-stored frequency point and reside, the terminal can use another pre-stored frequency point as a fallback target frequency point to perform the fallback attempt again, that is, the terminal attempts to fall back to another pre-stored frequency point and reside.
If a plurality of pre-stored frequency points belong to the same network and the network belongs to the same operator as the LTE network where the terminal resides, in this case, the plurality of pre-stored frequency points belonging to the same network can be sequenced according to the signal intensity of the frequency points, and the pre-stored frequency points are tried to reside in sequence according to the signal intensity of the frequency points in the fallback process, and 1 fallback attempt is performed in each network.
For example, assuming that an LTE network in which a terminal resides belongs to a china mobile, the terminal stores 15 pre-stored frequency points in advance, wherein 5 of the 15 pre-stored frequency points belong to a GSM network, 4 of the 5 pre-stored frequency points belong to a TD-SCDMA network, and 6 of the 6 pre-stored frequency points belong to a WCDMA network, the 5 pre-stored frequency points belonging to the GSM network are sorted according to the frequency point signal intensity, and try to reside in sequence according to the frequency point signal intensity in a fallback process, and then the 4 pre-stored frequency points belonging to the TD-SCDMA network are sorted according to the frequency point signal intensity, and try to reside in sequence according to the frequency point signal intensity in the fallback process. And (2) carrying out the fallback attempts on the 15 prestored frequency points in total (1 fallback attempt is carried out under each network, one frequency point is selected from 5 frequency points belonging to a GSM network according to the highest to low signal intensity of the frequency points for carrying out the fallback attempt, and one frequency point is selected from 4 frequency points belonging to a TD-SCDMA network according to the highest to low signal intensity of the frequency points for carrying out the fallback attempt).
The above description of the technical solution shows that: in this embodiment, if a plurality of pre-stored frequency points belong to the same network and the network to which the pre-stored frequency points belong and the LTE network in which the terminal resides belong to the same operator, in this case, the plurality of pre-stored frequency points belonging to the same network are sorted according to the frequency point signal strength, and the pre-stored frequency points try to reside in sequence according to the frequency point signal strength in the fallback process.
Conventional CSFB techniques are generally only applicable to scenarios where the circuit domain of a 2G or 3G network overlaps with an LTE network. Under the condition of the overlap, an operator usually allocates a frequency point of a 2G or 3G network for a frequency point of an LTE network, so that the terminal can be instructed to fall back to the frequency point of the 2G or 3G network in response to a CSFB request sent by the terminal.
It can be understood that, in step S105, the step of attempting to fall back to the frequency point corresponding to the neighboring frequency point information of the first-class frequency point and reside in the frequency point may not be limited to the above, that is, the method may be applied to a scenario in which a circuit domain of a 2G or 3G network overlaps with an LTE network, or may be applied to a scenario in which the overlapping coverage does not exist.
And S106, if the terminal does not store one or more pre-stored frequency points or the terminal fails to fall back to the pre-stored frequency points and resides, the terminal tries to reside in the 2G or 3G network in a network selection mode.
It can be understood that it takes much time to camp on the 2G or 3G network by way of network selection, which is equivalent to an inter-network handover process without using the CSFB technique, and it usually takes 5 to 10 seconds or more depending on the network conditions.
In the prior art, when a terminal does not receive a fallback target frequency point fed back by a network within a preset time, the terminal tries to reside in a 2G or 3G network in a network selection manner.
In step S104, in the embodiment, when the terminal does not receive the fallback target frequency point fed back by the network within the preset time, the terminal tries to fall back to a certain pre-stored frequency point and reside in the pre-stored frequency point in step S105, and when the terminal does not store one or more pre-stored frequency points or the terminal fails to fall back to the pre-stored frequency point and reside in the pre-stored frequency point, the terminal tries to reside in the 2G or 3G network in a network selection manner.
Therefore, for a terminal supporting the CSFB technique in the LTE system, in the case that the network does not respond to the CSFB request sent by the terminal, the present embodiment can reduce the situation that the terminal is forced to camp on the 2G or 3G network in a network selection manner, so that the handover speed of the terminal from the LTE network to the 2G or 3G network can be increased in the above situation.
And S107, after the terminal successfully resides in the 2G or 3G network, processing the circuit switching service.
It can be understood that if the terminal still cannot successfully reside in the 2G or 3G network by using the network selection method, the CS service cannot be processed. The above situation is usually caused by network failure, and the current technology cannot be solved by improving terminal hardware or software.
After the terminal completes processing of the circuit switching service, the terminal can reside under the frequency point of the LTE network again.
Example two
As described below, an embodiment of the present invention provides a processing apparatus for a circuit switched service in an LTE system.
Referring to the block diagram of the processing apparatus for circuit switched service in the LTE system shown in fig. 2:
the processing device of the circuit switching service under the LTE system comprises: a CSFB requesting unit 201, a first judging unit 202, a second judging unit 203, a CSFB fallback unit 204, a network selecting unit 205, and a service processing unit 206; the main functions of each unit are as follows:
a CSFB request unit 201, configured to send a CSFB request to a network when a terminal resides in an LTE network;
a first determining unit 202, configured to determine, after the CSFB request unit 201 sends a CSFB request to a network, whether a terminal receives a fallback target frequency point fed back by the network within a preset time, where the fallback target frequency point is sent to the terminal by the network in response to the CSFB request, and the fallback target frequency point can indicate that the terminal falls back to the fallback target frequency point, and the fallback target frequency point belongs to a 2G or 3G network;
a second judging unit 203, configured to judge whether the terminal stores one or more pre-stored frequency points when the first judging unit 202 judges that the terminal does not receive the fallback target frequency point fed back by the network within a preset time, where the pre-stored frequency points are pre-stored;
a CSFB fallback unit 204, configured to, when the second determining unit 203 determines that the terminal stores one or more pre-stored frequency points, try to fall back to a certain pre-stored frequency point and reside in the certain pre-stored frequency point;
a network selecting unit 205, configured to, when the second determining unit 203 determines that the terminal does not store one or more pre-stored frequency points, attempt to camp on a 2G or 3G network in a network selecting manner by the terminal;
a service processing unit 206, configured to process a circuit switched service after the terminal successfully resides in the 2G or 3G network;
the terminal can pre-store pre-stored frequency points, wherein the pre-stored frequency points belong to a 2G or 3G network.
The above description of the technical solution shows that: in this embodiment, for a terminal supporting a CSFB technique in an LTE system, when a network does not respond to a CSFB request sent by the terminal, it is determined whether the terminal stores one or more pre-stored frequency points, and if the terminal stores one or more pre-stored frequency points, the terminal tries to fall back to a certain pre-stored frequency point and resides in the certain pre-stored frequency point, so that a situation that the terminal is forced to reside in a 2G or 3G network using a network selection manner is reduced, and thus the switching speed of the terminal from the LTE network to the 2G or 3G network can be increased under the above situation.
In a specific implementation, the CSFB fallback unit 204 may be further configured to, when the first determining unit 202 determines that the terminal receives a fallback target frequency point fed back by the network within a preset time, the terminal attempts to fall back to the fallback target frequency point and reside.
In a specific implementation, when the first determining unit 202 determines that the terminal receives a fallback target frequency point fed back by the network within a preset time, but the terminal fails to successfully fall back to the fallback target frequency point and reside, then:
a second judging unit 203, which judges whether the terminal stores one or more pre-stored frequency points;
a CSFB fallback unit 204, configured to try to fall back to a certain pre-stored frequency point and reside in the certain pre-stored frequency point when the second determination unit 203 determines that the terminal stores one or more pre-stored frequency points;
a network selecting unit 205, configured to, when the second determining unit 203 determines that the terminal does not store one or more pre-stored frequency points, attempt to camp on a 2G or 3G network in a network selecting manner;
and a service processing unit 206, which processes the circuit switched service after the terminal successfully resides in the 2G or 3G network.
In a specific implementation, the terminal may store a plurality of pre-stored frequency points, and the plurality of pre-stored frequency points may belong to a plurality of networks.
In a specific implementation, the specific manner of the terminal trying to fall back to a certain pre-stored frequency point and residing may be: the terminal tries to fall back to a certain pre-stored frequency point and resides, and the network where the pre-stored frequency point belongs and the LTE network where the terminal resides belong to the same operator.
The above description of the technical solution shows that: in this embodiment, the terminal tries to fall back to a certain pre-stored frequency point and reside, and the network to which the pre-stored frequency point belongs and the LTE network in which the terminal resides belong to the same operator, so that frequency points at which the terminal cannot enjoy the service due to the difference of the operators are eliminated, and the switching speed of the terminal from the LTE network to the 2G or 3G network is further increased.
In a specific implementation, the CSFB fallback unit 204 may be further configured to try to fall back to another pre-stored frequency point and camp on the pre-stored frequency point if the terminal fails to fall back to a certain pre-stored frequency point and camp on the pre-stored frequency point.
In specific implementation, if a plurality of pre-stored frequency points belong to the same network, the plurality of pre-stored frequency points belonging to the same network can be sequenced according to the signal intensity of the frequency points, and the pre-stored frequency points try to reside in sequence according to the signal intensity of the frequency points in the fallback process.
The above description of the technical solution shows that: in this embodiment, if a plurality of pre-stored frequency points belong to the same network and the network to which the pre-stored frequency points belong and the LTE network in which the terminal resides belong to the same operator, in this case, the plurality of pre-stored frequency points belonging to the same network are sorted according to the frequency point signal strength, and the pre-stored frequency points try to reside in sequence according to the frequency point signal strength in the fallback process.
In a specific implementation, the plurality of pre-stored frequency points may belong to one or more of GSM, TD-SCDMA, or WCDMA networks.
In a specific implementation, the pre-stored frequency points may be stored for CSFB, or for other purposes, or for non-specific purposes.
The above description of the technical solution shows that: in this embodiment, the pre-stored frequency point may be stored for CSFB, other purposes, or non-specific purposes, so as to fully utilize existing resources in the terminal and enrich the source of the pre-stored frequency point.
In a specific implementation, the network selection unit 205 may be further configured to, if the terminal fails to fall back to the pre-stored frequency point and reside, try to reside in the 2G or 3G network in a network selection manner.
In a specific implementation, the circuit switched service may be a voice telephony service and/or a supplementary service.
EXAMPLE III
As described below, an embodiment of the present invention provides a user terminal.
The user terminal can pre-store pre-stored frequency points, the pre-stored frequency points belong to a 2G or 3G network, and the terminal supports a conventional CSFB technology which depends on network indication under an LTE system.
The difference from the prior art is that the user terminal further comprises a processing device for circuit switched services in the LTE system as provided in the embodiment of the present invention. Therefore, the user terminal judges whether the terminal stores one or more pre-stored frequency points or not under the condition that the network does not respond to the CSFB request sent by the terminal for the terminal supporting the CSFB technology in the LTE system, if the terminal stores one or more pre-stored frequency points, the terminal tries to fall back to a certain pre-stored frequency point and resides, the condition that the terminal is forced to reside in a 2G or 3G network by using a network selection mode is reduced, and the switching speed of the terminal from the LTE network to the 2G or 3G network can be accelerated under the condition.
In a specific implementation, the user terminal may be a smart phone.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by associated hardware instructed by a program, which may be stored in a computer-readable storage medium, and the storage medium may include: ROM, RAM, magnetic or optical disks, and the like.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (20)
1. A processing method of circuit switching service in LTE system is characterized in that a terminal can prestore prestored frequency points, the prestored frequency points belong to 2G or 3G network, the processing method comprises:
the terminal resides in an LTE network and sends a CSFB request to the network;
judging whether the terminal receives a fallback target frequency point fed back by the network within a preset time, wherein the fallback target frequency point is sent to the terminal by the network aiming at the CSFB request, the fallback target frequency point can indicate the terminal to fall back to the fallback target frequency point, and the fallback target frequency point belongs to a 2G or 3G network;
if the terminal does not receive the fallback target frequency point fed back by the network within the preset time, judging whether the terminal stores one or more prestored frequency points, wherein the prestored frequency points are prestored;
if the terminal stores one or more pre-stored frequency points, the terminal tries to fall back to a certain pre-stored frequency point and reside, and if the terminal fails to fall back to the pre-stored frequency point and reside, the terminal tries to reside in a 2G or 3G network in a network selection mode;
if the terminal does not store one or more pre-stored frequency points, the terminal tries to reside in a 2G or 3G network in a network selection mode;
after the terminal successfully resides in the 2G or 3G network, the circuit switching service is processed;
the specific steps of the terminal trying to fall back to a certain pre-stored frequency point and residing are as follows: the terminal tries to fall back to a certain pre-stored frequency point and resides, and the network where the pre-stored frequency point belongs and the LTE network where the terminal resides belong to the same operator.
2. The method for processing circuit switched service in LTE system according to claim 1, wherein if the terminal receives the fallback target frequency point fed back by the network within a preset time, the terminal tries to fall back to the fallback target frequency point and camp on the fallback target frequency point.
3. The method for processing circuit switching service in LTE system according to claim 2, wherein if the terminal receives the fallback target frequency point fed back by the network within the preset time, but fails to successfully fall back to the fallback target frequency point and reside, it determines whether the terminal stores one or more pre-stored frequency points;
if the terminal stores one or more pre-stored frequency points, the terminal tries to fall back to a certain pre-stored frequency point and resides;
if the terminal does not store one or more pre-stored frequency points, the terminal tries to reside in a 2G or 3G network in a network selection mode;
the terminal processes the circuit switched traffic after successfully camping under the 2G or 3G network.
4. The method for processing circuit-switched service in LTE system according to claim 1 or 3, wherein the terminal stores a plurality of pre-stored frequency points, and the pre-stored frequency points belong to a plurality of networks.
5. The method of claim 4, wherein if the terminal fails to fall back to a pre-stored frequency point and reside, the terminal tries to fall back to another pre-stored frequency point and reside.
6. The method for processing circuit-switched service in LTE system according to claim 4, wherein if there are multiple pre-stored frequency points belonging to the same network, the multiple pre-stored frequency points belonging to the same network are sorted according to frequency point signal strength, and try to reside in turn according to frequency point signal strength during fallback.
7. The method of claim 4, wherein the pre-stored frequency points belong to one or more of GSM, TD-SCDMA and WCDMA networks.
8. The method for processing circuit switched services in LTE system according to claim 1 or 3, wherein the pre-stored frequency point is stored for CSFB, or stored for other purposes, or stored for non-specific purposes.
9. The method for processing circuit switched service in LTE system according to claim 1 or 3, wherein the circuit switched service is voice telephony service and/or supplementary service.
10. The utility model provides a processing apparatus of circuit switching service under LTE system which characterized in that, the terminal can prestore the frequency point of prestoring, prestore the frequency point and belong to 2G or 3G network, processing apparatus includes: the system comprises a CSFB request unit, a first judgment unit, a second judgment unit, a CSFB fallback unit, a network selection unit and a service processing unit; wherein:
a CSFB request unit, configured to send a CSFB request to a network when a terminal resides in an LTE network;
the first judgment unit is used for judging whether a terminal receives a fallback target frequency point fed back by a network within a preset time after the CSFB request unit sends a CSFB request to the network, wherein the fallback target frequency point is sent to the terminal by the network aiming at the CSFB request, the fallback target frequency point can indicate the terminal to fall back to the fallback target frequency point, and the fallback target frequency point belongs to a 2G or 3G network;
the second judging unit is used for judging whether the terminal stores one or more prestored frequency points or not under the condition that the first judging unit judges that the terminal does not receive the fallback target frequency point fed back by the network within the preset time, wherein the prestored frequency points are prestored;
the CSFB falling unit is used for the terminal to try to fall back to a certain pre-stored frequency point and stay under the condition that the second judging unit judges that the terminal stores one or more pre-stored frequency points;
the network selection unit is used for the terminal to try to reside in the 2G or 3G network in a network selection mode under the condition that the second judgment unit judges that the terminal does not store one or more pre-stored frequency points, and is also used for the terminal to try to reside in the 2G or 3G network in a network selection mode if the terminal fails to fall back to the pre-stored frequency points and reside;
the service processing unit is used for processing the circuit switching service after the terminal successfully resides in the 2G or 3G network;
the specific steps of the terminal trying to fall back to a certain pre-stored frequency point and residing are as follows: the terminal tries to fall back to a certain pre-stored frequency point and resides, and the network where the pre-stored frequency point belongs and the LTE network where the terminal resides belong to the same operator.
11. The apparatus for processing circuit switching service in LTE system according to claim 10, wherein the CSFB fallback unit is further configured to, when the first determining unit determines that the terminal receives a fallback target frequency point fed back by the network within a preset time, the terminal tries to fall back to the fallback target frequency point and camp on the fallback target frequency point.
12. The apparatus for processing circuit switching service in LTE system according to claim 11, wherein when the first determining unit determines that the terminal receives the fallback target frequency point fed back by the network within the preset time, but the terminal fails to successfully fall back to and reside at the fallback target frequency point, then:
the second judgment unit is used for judging whether the terminal stores one or more pre-stored frequency points;
the CSFB falling unit is used for the terminal to try to fall back to a certain pre-stored frequency point and stay under the condition that the second judging unit judges that the terminal stores one or more pre-stored frequency points;
the network selection unit is used for trying to reside in a 2G or 3G network in a network selection mode under the condition that the second judgment unit judges that the terminal does not store one or more pre-stored frequency points;
and the service processing unit is used for processing the circuit switching service after the terminal successfully resides in the 2G or 3G network.
13. The apparatus for processing circuit-switched services in LTE system according to claim 10 or 12, wherein the terminal stores a plurality of pre-stored frequency points, and the pre-stored frequency points belong to a plurality of networks.
14. The apparatus for processing circuit-switched services in the LTE system according to claim 13, wherein the CSFB fallback unit is further configured to, if the terminal fails to successfully fall back to a certain pre-stored frequency point and camp on the certain pre-stored frequency point, the terminal tries to fall back to another pre-stored frequency point and camp on the certain pre-stored frequency point.
15. The apparatus for processing circuit switching service in LTE system according to claim 13, wherein if there are multiple pre-stored frequency points belonging to the same network, the multiple pre-stored frequency points belonging to the same network are sorted according to frequency point signal strength, and try to camp in turn according to frequency point signal strength during fallback.
16. The apparatus for processing circuit switched services in LTE system according to claim 13, wherein the plurality of pre-stored frequency points belong to one or more of GSM or TD-SCDMA or WCDMA networks.
17. The apparatus for processing circuit switched services in LTE system according to claim 11 or 13, wherein the pre-stored frequency point is stored for CSFB, or stored for other purposes, or stored for non-specific purposes.
18. The apparatus for processing circuit switched service under LTE system according to claim 10 or 12, wherein the circuit switched service is voice telephony service and/or supplementary service.
19. A user terminal supporting a conventional, network indication dependent CSFB technique under LTE system, characterized in that it further comprises processing means for circuit switched services under LTE system according to any of claims 10 to 18.
20. The user terminal of claim 19, wherein the user terminal is a smartphone.
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| CN201910878594.9A CN110505667B (en) | 2015-02-16 | 2015-02-16 | User terminal and method and device for processing circuit switching service in LTE system of user terminal |
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| CN108668298B (en) * | 2017-03-30 | 2021-05-04 | 中国移动通信集团设计院有限公司 | CSFB fallback frequency point optimization method and server |
| WO2019000309A1 (en) * | 2017-06-29 | 2019-01-03 | 华为技术有限公司 | Method for circuit switched fallback, and terminal |
| CN108124511B (en) * | 2017-09-30 | 2020-12-22 | 深圳市欢太科技有限公司 | CSFB (Circuit switched Fall Back) result detection method and device and storage medium |
| CN108124514B (en) * | 2017-09-30 | 2021-01-22 | 深圳市欢太科技有限公司 | CSFB (Circuit switched Fall Back) fall result detection method and device and computer storage medium |
| CN110300437B (en) * | 2019-07-25 | 2021-06-22 | 中国联合网络通信集团有限公司 | Method, terminal and system for shortening CSFB (Circuit switched fallback) cell fall-back time |
| CN113747381B (en) * | 2021-09-07 | 2023-02-17 | 维沃移动通信有限公司 | Method and device for fallback of evolved packet system and electronic equipment |
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| CN110505667A (en) | 2019-11-26 |
| CN105992294B (en) | 2019-09-27 |
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