CN104284343B - Dispositions method, system and the dual-mode terminal of VoLTE - Google Patents
Dispositions method, system and the dual-mode terminal of VoLTE Download PDFInfo
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Abstract
This disclosure relates to a kind of dispositions method of VoLTE, system and dual-mode terminal.This method includes dual-mode terminal in LTE network and overlapping covered interior signal of the reception from LTE network and the signal from 2G/3G networks at the same time of 2G/3G networks；The audio call initiated in response to dual-mode terminal, receives the information that the base station that dual-mode terminal is currently located in LTE network is sent, and the information that the base station in LTE network is sent determines that dual-mode terminal is currently located whether sector supports VoLTE rises to exhale；If dual-mode terminal be currently located sector support VoLTE rise exhale, dual-mode terminal be based on VoLTE by call setup on an LTE network, otherwise dual-mode terminal by call setup on 2G/3G networks.The disclosure can ensure relatively low cutting off rate in the case where switching without different system.
Description
Technical Field
The present disclosure relates to mobile communications, and in particular, to a method and a system for deploying Voice over LTE (Voice over LTE) and a dual mode terminal.
Background
LTE (Long Term Evolution) is a Long Term Evolution of UMTS (universal mobile telecommunications System) technical standard established by the 3GPP organization. VoLTE is a voice service system with quality of service guarantees provided by LTE networks.
The LTE network does not realize the whole network coverage in the initial stage of network establishment, and only covers in a limited range; the coverage of the current 2G/3G network, such as GSM (Global System for Mobile communications), WCDMA (Wideband Code Division Multiple Access), CDMA (Code Division Multiple Access), etc., is the full-network coverage. Therefore, from the coverage range, the coverage of the LTE network is only the inner part of the coverage of the 2G/3G network, as shown in fig. 1, the coverage area corresponding to the outermost dark ellipse is the coverage area of the 2G/3G network, and the coverage area corresponding to the inner light ellipse is the coverage area of the LTE network.
In a network formed by overlapping the LTE network and the 2G/3G network, that is, a coverage area corresponding to the light ellipse in fig. 1, a dual-mode terminal supporting both the 2G/3G technology and the LTE technology needs to be used to receive services provided by the two networks.
When the LTE technology does not implement full-network coverage, in order to maintain Continuity when the VoLTE moves from the LTE coverage area to the non-LTE coverage area, a conventional VoLTE deployment scheme is to perform cross-system handover with the 2G/3G network at the edge of the LTE network, as shown in fig. 2, when a user establishes a VoLTE Voice Call in the LTE network and moves to the outside of the LTE coverage area, the LTE network and the 2G/3G network need to jointly start an SRVCC (Single Radio Voice Call Continuity, dual-mode Single-standby wireless Voice Call Continuity) handover mechanism, and the Voice is handed over from the LTE network to the 2G/3G network, thereby ensuring that the Voice Call is not dropped. Voice calls established at the edge of the LTE network are very susceptible to dropped calls if SRVCC technology is not employed.
When the LTE network is switched to the 2G/3G network, signaling interaction between the two networks is required, a neighbor list of the 2G/3G network base station is required to be arranged in the LTE base station, and the dual-mode terminal is required to be capable of searching for networks of different systems according to network signaling while communicating, so that the terminal and the network equipment are extremely complex. Therefore, the existing SRVCC technology has the following technical problems:
(1) the network and the terminal are very complex, so that the application effect of the switching of the different systems is not obvious;
(2) the complexity of the terminal is greatly improved, and the price and the variety of the terminal are influenced;
(3) due to the reasons, it is difficult to deploy the VoLTE technology when LTE is not full-network coverage.
Disclosure of Invention
The present disclosure proposes a new technical solution in view of at least one of the above problems.
The present disclosure provides, in one aspect thereof, a deployment method of VoLTE, which can ensure a lower call drop rate without performing inter-system handover.
The present disclosure provides, in another aspect thereof, a dual mode terminal capable of guaranteeing a lower dropped call rate without performing inter-system handover.
The present disclosure provides, in yet another aspect thereof, a deployment system of VoLTE, which can guarantee a lower call drop rate without performing inter-system handover.
According to the present disclosure, there is provided a deployment method of VoLTE, including:
the dual-mode terminal simultaneously receives signals from the LTE network and signals from the 2G/3G network in the overlapping coverage area of the LTE network and the 2G/3G network;
responding to a voice call initiated by a dual-mode terminal, receiving information sent by a base station in an LTE network where the dual-mode terminal is located currently, determining whether a sector where the dual-mode terminal is located currently supports VoLTE origination or not according to the information sent by the base station in the LTE network, determining whether the sector where the dual-mode terminal is located currently supports VoLTE origination or not, and whether the sector where the dual-mode terminal is located currently supports VoLTE origination or not is related to a position relation between a coverage area of the sector where the dual-mode terminal is located currently in the LTE network and a protective band, wherein the protective band is an area with a set width from the edge of the overlapping coverage area in;
if the sector where the dual-mode terminal is located currently supports VoLTE calling, the dual-mode terminal establishes a call on an LTE network based on VoLTE, otherwise, the dual-mode terminal establishes the call on a 2G/3G network.
In some embodiments of the disclosure, the method further comprises:
and if the coverage range of the sector in the LTE network where the dual-mode terminal is currently located is completely within the guard band, setting the sector where the dual-mode terminal is currently located to support VoLTE origination, and otherwise, setting the sector where the dual-mode terminal is currently located to not support VoLTE origination.
In some embodiments of the present disclosure, the width of the guard band is related to the average talk time in the network metrics.
In some embodiments of the present disclosure, the longer the average talk time period in the network metrics, the wider the width of the guard band.
In some embodiments of the present disclosure, the information sent by the base station in the LTE network where the dual-mode terminal is currently located is a system message, a broadcast signal, a multicast signal, or a short message.
According to the present disclosure, there is also provided a dual mode terminal, including:
a network signal receiving unit for simultaneously receiving a signal from the LTE network and a signal from the 2G/3G network in an overlapping coverage area of the LTE network and the 2G/3G network;
the VoLTE call starting judging unit is used for responding to a voice call initiated by the dual-mode terminal, receiving information sent by a base station in an LTE network where the dual-mode terminal is located currently, determining whether a sector where the dual-mode terminal is located currently supports VoLTE call starting according to the information sent by the base station in the LTE network, determining whether the sector where the dual-mode terminal is located currently supports VoLTE call starting and is related to the position relation between the coverage range of the sector where the dual-mode terminal is located currently in the LTE network and a protective band, and the protective band is an area with a set width from the edge of an overlapping coverage area in the overlapping coverage area of the LTE network and the 2G/3G network;
and the call establishing unit is used for establishing the call on the LTE network based on the VoLTE if the sector where the dual-mode terminal is located currently supports the VoLTE call, otherwise, establishing the call on the 2G/3G network.
In some embodiments of the present disclosure, the width of the guard band is related to the average talk time in the network metrics.
In some embodiments of the present disclosure, the longer the average talk time period in the network metrics, the wider the width of the guard band.
In some embodiments of the present disclosure, the information sent by the base station in the LTE network where the dual-mode terminal is currently located is a system message, a broadcast signal, a multicast signal, or a short message.
According to the disclosure, a deployment system of VoLTE is also provided, which includes LTE network side equipment, 2G/3G network side equipment, and the dual-mode terminal of the foregoing embodiment.
In some embodiments of the disclosure, if the coverage of the sector in the LTE network where the dual-mode terminal is currently located is completely within the guard band, the LTE network side device sets that the sector where the dual-mode terminal is currently located supports the VoLTE origination, otherwise, the LTE network side device sets that the sector where the dual-mode terminal is currently located does not support the VoLTE origination.
In the technical scheme of the disclosure, when the dual-mode terminal initiates a voice call in an overlapping coverage area of the LTE network and the 2G/3G network, whether a sector where the dual-mode terminal is currently located supports VoLTE origination can be judged according to a message sent by a base station in the LTE network where the dual-mode terminal is located, if so, the dual-mode terminal can initiate the VoLTE origination in the LTE network, otherwise, the dual-mode terminal establishes a call in the 2G/3G network. Whether the current sector of the dual-mode terminal supports the VoLTE origination or not is related to the coverage of the current sector, and if the coverage of the current sector of the terminal is completely within the guard band, the VoLTE origination can be supported. Under the action of the protection band, the method and the device can enable a user to realize lower call drop rate even if the user does not carry out SRVCC switching to a 2G/3G network.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, are incorporated in and constitute a part of this application. In the drawings:
fig. 1 is a schematic coverage diagram of an LTE network and a 2G/3G network.
Fig. 2 is a schematic diagram illustrating an implementation of inter-system handover by using SRVCC technology in the prior art.
Fig. 3 is a schematic diagram of the present disclosure setting a VoLTE handover guard band.
Fig. 4 is a schematic diagram of an example handover guard band and sector distribution in the disclosure.
Fig. 5 is a flowchart illustrating a deployment method of VoLTE according to an embodiment of the present disclosure.
Fig. 6 is a schematic structural diagram of a dual mode terminal according to an embodiment of the present disclosure.
Fig. 7 is a schematic structural diagram of a deployment system of VoLTE according to an embodiment of the present disclosure.
Detailed Description
The present disclosure will be described below with reference to the accompanying drawings. It is to be noted that the following description is merely illustrative and exemplary in nature and is in no way intended to limit the disclosure, its application, or uses. Unless specifically stated otherwise, the relative arrangement of components and steps and numerical expressions and values set forth in the embodiments do not limit the scope of the present disclosure. Additionally, techniques, methods, and apparatus known to those skilled in the art may not be discussed in detail but are intended to be part of the specification where appropriate.
Fig. 3 is a schematic diagram of the present disclosure setting a VoLTE handover guard band.
As shown in fig. 3, a switching guard band, i.e., a light gray stripe region in fig. 3, is provided at the edge of the overlapping coverage area of the LTE network and the 2G/3G network (i.e., a white region in the center and a light gray stripe region in the periphery thereof).
Specifically, the width of the guard band may be adjusted according to the set dropped call rate. For example, if it is found that the call drop rate is much lower than the set call drop rate (e.g., 1%) when the guard band in a certain area is within the coverage range of two base stations according to the network index analysis, the width of the guard band may be reduced to the coverage range of one base station, and then it is further verified that the target is reached if the call drop rate can also be lower than 1% when the guard band is within the coverage range of one base station, that is, the width of the guard band may be set to the coverage range of one base station.
It should be noted that the width of the guard band in the present disclosure is an integer multiple of the coverage of one base station, at least the coverage of one base station, and possibly the coverage of multiple base stations.
Further, the width of the guard band is also related to the average talk time in the network index. The longer the average talk time in the network index, the wider the guard band width.
Because the call duration obeys a certain probability distribution, when the user makes a VoLTE call in a specified area, even if the user moves, most users move to the edge of the LTE network due to the existence of the guard band, and the call is ended. Statistically, 99% of call sessions are within about 600 seconds, and only about 1% of calls may exceed 600 seconds. Therefore, as long as the requirement of 600-second movement of a user can be met, the call drop rate can be limited within 1% and the call quality can meet the requirement of commercial indexes.
In addition, it should be noted that the following embodiments of the present disclosure are not only applicable to voice services, but also applicable to video calls or other mobile communication services. The method is not only suitable for the overlay network of the LTE network and the 2G/3G network, but also suitable for the overlay network formed by any other two mobile communication technologies. Since the coverage area of the newly-built network is smaller than that of the old network in the initial period, and the coverage area of the old network is wider, the embodiments of the present disclosure are applicable to all networks overlapping the new network and the old network.
In order to facilitate description of the technical solution, the following embodiments of the present disclosure take an overlapping network of a CDMA network and an LTE network as an example.
If the CDMA/LTE dual-mode terminal performs voice call origination in an LTE coverage area, a VoLTE technology or a CDMA voice technology can be adopted, and a VoLTE switching protection band is reserved, so that the VoLTE origination is allowed to be performed by the sector of which the coverage area of the sector where the terminal is located is completely within the switching protection band, and the VoLTE origination can be initiated by the terminal in CELL1, CELL2, CELL3 and CELL4 in FIG. 4; while sectors whose coverage is not completely within the guard band, e.g., terminals in CELL5 and CELL6, are not allowed to initiate VoLTE origination, and voice calls in both sectors will employ CDMA voice technology. Whether a sector within the LTE coverage area allows a VoLTE call, the LTE network may inform the dual mode terminal by, but not limited to: system messages, short messages, broadcast or multicast modes of the LTE network and the like.
Due to the existence of the switching guard band and the width of the guard band is wide enough, when a user moves in the VoLTE call which is started, even if the user does not switch to the CDMA network, the call drop rate can be low enough, and the commercial network index requirement can be met. The embodiments of the present disclosure described below can maximally deploy VoLTE without full network coverage in an LTE network, and omit a complex process of inter-system handover and network optimization preparation work, thereby significantly simplifying network deployment associated with CDMA and LTE.
Fig. 5 is a flowchart illustrating a deployment method of VoLTE according to an embodiment of the present disclosure.
As shown in fig. 5, this embodiment may include the steps of:
s502, the dual-mode terminal simultaneously receives signals from the LTE network and signals from the 2G/3G network in the overlapping coverage area of the LTE network and the 2G/3G network, so that the dual-mode terminal which can simultaneously support the LTE network and the 2G/3G network can be accessed into any network.
S504, responding to a voice call initiated by the dual-mode terminal, receiving information sent by a base station in an LTE network where the dual-mode terminal is currently located, and determining whether a sector where the dual-mode terminal is currently located supports VoLTE origination or not according to the information sent by the base station in the LTE network;
whether the sector where the dual-mode terminal is currently located supports VoLTE origination is related to the position relation between the coverage of the sector in the LTE network where the dual-mode terminal is currently located and a guard band, if the coverage of the sector in the LTE network where the dual-mode terminal is currently located is completely within the guard band, the sector where the dual-mode terminal is currently located is set to support VoLTE origination, otherwise, the sector where the dual-mode terminal is currently located is set to not support VoLTE origination, and the information is issued to the dual-mode terminal by a base station in the LTE network through multiple modes. Specifically, the information sent by the base station in the LTE network where the dual-mode terminal is currently located may be a system message, a broadcast signal, a multicast signal, or a short message.
In addition, the guard band is an area with a set width from the edge of the overlapping coverage area in the overlapping coverage area of the LTE network and the 2G/3G network, such as the VoLTE handover guard band shown in fig. 3;
s506, if the sector where the dual-mode terminal is located currently supports VoLTE calling, the dual-mode terminal establishes the call on an LTE network based on VoLTE, otherwise, the dual-mode terminal establishes the call on a 2G/3G network.
In this embodiment, when the dual-mode terminal initiates a voice call in the overlapping coverage area of the LTE network and the 2G/3G network, it may be determined whether the sector where the dual-mode terminal is currently located supports the VoLTE origination according to a message sent by a base station in the LTE network where the dual-mode terminal is located, if so, the dual-mode terminal may initiate the VoLTE origination in the LTE network, otherwise, the call is established in the 2G/3G network. Whether the current sector of the dual-mode terminal supports the VoLTE origination or not is related to the coverage of the current sector, and if the coverage of the current sector of the terminal is completely within the guard band, the VoLTE origination can be supported. Under the action of the protection band, the method and the device can enable a user to realize lower call drop rate even if the user does not carry out SRVCC switching to a 2G/3G network.
Next, referring to fig. 4 again, the technical solution of the present disclosure will be described in detail by a specific example.
The CDMA/LTE dual-mode terminal simultaneously receives network signals of CDMA and LTE in an LTE coverage area;
when a user moves to CELL4 in an LTE coverage area, if a voice call needs to be carried out, because the coverage area of CELL4 is completely in the VoLTE coverage area at the center, the terminal knows that the sector can carry out VoLTE origination through the system message of LTE CELL 4;
a user establishes a voice call, and the call is established on the VoLTE technology of the LTE network;
when the user moves to the outside, because the VoLTE switching guard band exists and the width of the guard band is large enough, the call is not dropped, and the voice call is normally ended.
When the user continues to move to the CELL6 sector, if a voice call needs to be established, because a part of the coverage area of the CELL sector is in a guard band, the dual-mode terminal knows from the system message of the CELL6 sector of the LTE network that the sector does not allow the VoLTE call to be established, and therefore the terminal establishes the call on the voice technology of the CDMA network;
the CDMA network is a network with perfect coverage, so that the user's call is normally ended without a dropped call.
It will be understood by those skilled in the art that all or part of the steps of implementing the above method embodiments may be implemented by hardware associated with program instructions, the program may be stored in a storage medium readable by a computing device, and the program may execute the steps of the above method embodiments when executed, and the storage medium may include various media capable of storing program codes, such as ROM, RAM, magnetic disk and optical disk.
Fig. 6 is a schematic structural diagram of a dual mode terminal according to an embodiment of the present disclosure.
As shown in fig. 6, the dual mode terminal 60 in this embodiment may include a network signal receiving unit 602, a VoLTE origination judging unit 604, and a call establishing unit 606. Wherein,
a network signal receiving unit 602, configured to simultaneously receive a signal from the LTE network and a signal from the 2G/3G network in an overlapping coverage area of the LTE network and the 2G/3G network;
a VoLTE origination judging unit 604, configured to receive, in response to a voice call initiated by a dual-mode terminal, information sent by a base station in an LTE network where the dual-mode terminal is currently located, and determine, according to the information sent by the base station in the LTE network, whether a sector where the dual-mode terminal is currently located supports VoLTE origination, whether the sector where the dual-mode terminal is currently located supports VoLTE origination, and whether the coverage of the sector in the LTE network where the dual-mode terminal is currently located is related to a position relationship between a guard band and a coverage range of the sector in the LTE network, where the dual-mode terminal is currently located, where the guard band is an area with a set width from an edge of an overlapping;
a call establishing unit 606, configured to establish a call on an LTE network based on VoLTE if the sector where the dual-mode terminal is currently located supports VoLTE origination, and otherwise establish the call on a 2G/3G network.
In this embodiment, when the dual-mode terminal initiates a voice call in the overlapping coverage area of the LTE network and the 2G/3G network, it may be determined whether the sector where the dual-mode terminal is currently located supports the VoLTE origination according to a message sent by a base station in the LTE network where the dual-mode terminal is located, if so, the dual-mode terminal may initiate the VoLTE origination in the LTE network, otherwise, the call is established in the 2G/3G network. Whether the current sector of the dual-mode terminal supports the VoLTE origination or not is related to the coverage of the current sector, and if the coverage of the current sector of the terminal is completely within the guard band, the VoLTE origination can be supported. Under the action of the protection band, the method and the device can enable a user to realize lower call drop rate even if the user does not carry out SRVCC switching to a 2G/3G network.
Wherein the width of the guard band is related to the average talk time in the network index. Further, the longer the average call duration in the network index is, the wider the guard band is.
In addition, the information sent by the base station in the LTE network where the dual-mode terminal is currently located is a system message, a broadcast signal, a multicast signal or a short message.
Fig. 7 is a schematic structural diagram of a deployment system of VoLTE according to an embodiment of the present disclosure.
As shown in fig. 7, the system 70 in this embodiment may include an LTE network side device 702, a 2G/3G network side device 704, and a dual mode terminal 706. Wherein the dual mode terminal 706 may be implemented as in the previous embodiments.
Further, if the coverage area of the sector in the LTE network where the dual-mode terminal is currently located is completely within the guard band, the LTE network side device sets that the sector where the dual-mode terminal is currently located supports the VoLTE origination, otherwise, the LTE network side device sets that the sector where the dual-mode terminal is currently located does not support the VoLTE origination.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments can be mutually referred to. For the apparatus embodiment, since it is substantially similar to the method embodiment, the description is relatively simple, and reference may be made to the description of the method embodiment section for the relevant points.
While the present disclosure has been described with reference to exemplary embodiments, it should be understood that the present disclosure is not limited to the exemplary embodiments described above. It will be apparent to those skilled in the art that the above-described exemplary embodiments may be modified without departing from the scope and spirit of the disclosure. The scope of the following claims is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures and functions.
Claims (10)
1. A deployment method of VoLTE, comprising:
the dual-mode terminal simultaneously receives signals from the LTE network and signals from the 2G/3G network in the overlapping coverage area of the LTE network and the 2G/3G network;
responding to a voice call initiated by the dual-mode terminal, receiving information sent by a base station in an LTE network where the dual-mode terminal is located currently, and determining whether a sector where the dual-mode terminal is located currently supports VoLTE origination or not according to the information sent by the base station in the LTE network, whether the sector where the dual-mode terminal is located currently supports VoLTE origination or not is related to a position relation between a coverage area of the sector where the dual-mode terminal is located currently and a protective band, wherein the protective band is an area with a set width from the edge of the overlapping coverage area in the overlapping coverage area of the LTE network and the 2G/3G network; if the coverage area of the sector in the LTE network where the dual-mode terminal is currently located is completely within the inner side edge of the protective band, setting the sector where the dual-mode terminal is currently located to support VoLTE origination, and otherwise, setting the sector where the dual-mode terminal is currently located to not support VoLTE origination;
if the sector where the dual-mode terminal is located currently supports VoLTE calling, the dual-mode terminal establishes a call on an LTE network based on VoLTE, otherwise, the dual-mode terminal establishes the call on a 2G/3G network.
2. The deployment method of VoLTE of claim 1, wherein the width of the guard band is related to an average talk time in a network indicator.
3. The deployment method of VoLTE according to claim 2, wherein the longer the average talk time in the network metrics, the wider the guard band width.
4. The deployment method of VoLTE as claimed in claim 1, wherein the information sent by the base station in the LTE network where the dual mode terminal is currently located is a system message, a broadcast signal, a multicast signal or a short message.
5. A dual mode terminal, comprising:
a network signal receiving unit for simultaneously receiving a signal from the LTE network and a signal from the 2G/3G network in an overlapping coverage area of the LTE network and the 2G/3G network;
a VoLTE origination judging unit, configured to receive information sent by a base station in an LTE network where the dual-mode terminal is currently located in response to a voice call initiated by the dual-mode terminal, and determine whether a sector where the dual-mode terminal is currently located supports VoLTE origination according to the information sent by the base station in the LTE network, whether the sector where the dual-mode terminal is currently located supports VoLTE origination and is related to a position relationship between a coverage area of the sector in the LTE network where the dual-mode terminal is currently located and a guard band, where the guard band is an area with a set width from an edge of the overlapping coverage area in an overlapping coverage area of the LTE network and the 2G/3G network; if the coverage area of the sector in the LTE network where the dual-mode terminal is currently located is completely within the inner side edge of the protective band, setting the sector where the dual-mode terminal is currently located to support VoLTE origination, and otherwise, setting the sector where the dual-mode terminal is currently located to not support VoLTE origination;
and the call establishing unit is used for establishing a call on an LTE network based on VoLTE if the sector where the dual-mode terminal is located currently supports VoLTE origination, or else establishing the call on a 2G/3G network.
6. The dual-mode terminal as claimed in claim 5, wherein the width of the guard band is related to an average talk time in a network index.
7. The dual mode terminal of claim 6, wherein the longer the average talk time in the network metrics, the wider the guard band width.
8. The dual-mode terminal of claim 5, wherein the information sent by the base station in the LTE network where the dual-mode terminal is currently located is a system message, a broadcast signal, a multicast signal or a short message.
9. A deployment system of VoLTE, comprising LTE network side equipment, 2G/3G network side equipment and the dual-mode terminal of any one of claims 5 to 8.
10. The VoLTE deployment system according to claim 9, wherein if the coverage of the sector in the LTE network where the dual mode terminal is currently located is completely within the inside edge of the guard band, the LTE network side device sets that the sector where the dual mode terminal is currently located supports VoLTE origination, and otherwise, the LTE network side device sets that the sector where the dual mode terminal is currently located does not support VoLTE origination.
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| CN107645787B (en) * | 2016-07-21 | 2021-09-10 | 中兴通讯股份有限公司 | Data transmission protection method and device |
| CN106792937B (en) * | 2016-12-08 | 2020-06-19 | 北京小米移动软件有限公司 | Method and device for processing call request |
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| CN102209370A (en) * | 2010-03-31 | 2011-10-05 | 重庆重邮信科通信技术有限公司 | Method for initiating circuit switch (CS) domain voice call by LTE (long term evolution) multimode terminal under LTE access mode |
| CN103069889A (en) * | 2010-06-11 | 2013-04-24 | 捷讯研究有限公司 | Methods and apparatus for voice domain operation |
| CN102404815A (en) * | 2010-09-15 | 2012-04-04 | 中国移动通信集团公司 | Method for determining network interoperation mode and terminal equipment |
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